Solar Module EVA Film Introduction 1

In order to improve the power generation efficiency of solar cell modules, provide protection against the loss caused by environmental climate change, and ensure the service life of solar modules, EVA plays a very important role. EVA is non-adhesive and anti-adhesive at room temperature. After hot pressing under certain conditions during the solar cell packaging process, EVA will produce melt bonding and adhesive curing. The cured EVA film becomes completely transparent and has quite high light transmittance. The cured EVA can withstand atmospheric changes and has elasticity. The solar cell wafer is wrapped and bonded with the upper glass and lower TPT by vacuum lamination technology.

Basic functions of EVA film:

1. Secure the solar Cell and connecting circuit wires to provide cell insulation protection

2. Perform optical coupling

3. Provide moderate mechanical strength

4. Provide a heat transfer pathway

EVA Main features:

1. Heat resistance, low temperature resistance, moisture resistance and weather resistance

2. Good followability to metal glass and plastic

3. Flexibility & Elasticity

4. High light transmission

5. Impact resistance

6. Low temperature winding

Thermal conductivity of solar cell related materials: (K value of thermal conductivity at 27 ° C (300'K))

Description: EVA is used for the combination of solar cells as a follow-up agent, because of its strong follow-up ability, softness and elongation, it is suitable for joining two different expansion coefficient materials.

Aluminum: 229 ~ 237 W/(m·K)

Coated aluminum alloy: 144 W/(m·K)

Silicon wafer: 80 ~ 148 W/(m·K)

Glass: 0.76 ~ 1.38 W/(m·K)

EVA: 0.35W /(m·K)

TPT: 0.614 W/(m·K)

EVA appearance inspection: no crease, no stain, smooth, translucent, no stain edge, clear embossing

EVA material performance parameters:

Melting index: affects the enrichment rate of EVA

Softening point: The temperature point at which EVA begins to soften

Transmittance: There are different transmittance for different spectral distributions, which mainly refers to the transmittance under the spectral distribution of AM1.5

Density: density after bonding

Specific heat: the specific heat after bonding, reflecting the size of the temperature increase value when the EVA after bonding absorbs the same heat

Thermal conductivity: thermal conductivity after bonding, reflecting the thermal conductivity of EVA after bonding

Glass transition temperature: reflects the low temperature resistance of EVA

Breaking tension strength: The breaking tension strength of EVA after bonding reflects the mechanical strength of EVA after bonding

Elongation at break: the elongation at break at EVA after bonding reflects the tension of EVA after bonding

Water absorption: It directly affects the sealing performance of battery cells

Binding rate: The binding rate of EVA directly affects his impermeability

Peel strength: reflects the bond strength between EVA and peel

EVA reliability test purpose: to confirm the weather resistance, light transmission, bonding force, ability to absorb deformation, ability to absorb physical impact, damage rate of pressing process of EVA... Let's wait.

EVA aging test equipment and projects: constant temperature and humidity test chamber (high temperature, low temperature, high temperature and high humidity), high and low temperature chamber (temperature cycle), ultraviolet testing machine (UV)

VA Model 2: Glass /EVA/ conductive copper sheet /EVA/ glass composite

Description: Through the on-resistance electrical measurement system, the low resistance in EVA is measured. Through the change of the on-resistance value during the test, the water and gas penetration of EVA is determined, and the oxidation corrosion of copper sheet is observed.

After three tests of temperature cycle, wet freezing and wet heat, the characteristics of EVA and Backsheet change:

(↑ : up, ↓ : down)

After three tests of temperature cycle, wet freezing and wet heat, the characteristics of EVA and Backsheet change:

(↑ : up, ↓ : down)

EVA：	Backsheet：
Yellow↑	Inner layer yellow ↑
Cracking ↑	Cracks in the inner layer and PET layer ↑
Atomization ↑	Reflectivity ↓
Transparency ↓

 

 

Solar Module EVA Film Introduction 2

EVA-UV test:

Description: Test the attenuation ability of EVA to withstand ultraviolet (UV) irradiation, after a long time of UV irradiation, EVA film will appear brown, penetration rate decreased... And so on.

EVA environmental test project and test conditions:

Humid heat: 85℃ / RH 85%; 1,000 hrs

Thermal cycle: -40℃ ~ 85℃; 50 cycles

Wet freezing test: -40℃ ~ 85℃ / RH 85%; 10 times UV: 280~385nm/ 1000w/200hrs (no cracking and no discoloration)

EVA Test Conditions (NREL) :

High temperature test: 95℃ ~ 105℃/1000h

Humidity and heat: 85℃/85%R.H./>1000h[1500h]

Temperature cycle: -40℃←→85℃/>200Cycles 

(No bubbles, no cracking, no desticking, no discoloration, no thermal expansion and contraction)

UV aging: 0.72W/m2, 1000 hrs, 60℃(no cracking, no discoloration) Outdoor: > California sunshine for 6 months

Example of EVA characteristics change under Damp heat test:

Discoloration, atomization, Browning, delamination

Comparison of EVA bond strength at high temperature and humidity:

Description: EVA film at 65℃/85%R.H and 85℃/85%R.H. The degradation of the bond strength was compared at 65℃/85%R.H under two different wet and hot conditions. After 5000 hours of testing, the degradation benefit is not high, but EVA at 85℃/85%R.H. In the test environment, the adhesion is quickly lost, and there is a significant reduction in bond strength in 250 hours.

EVA-HAST unsaturated pressurized vapor test:

Objective: Since EVA film needs to be tested for more than 1000 hours at 85℃/85%R.H., which is equal to at least 42 days, in order to shorten the test time and accelerate the test speed, it is necessary to increase the environmental stress (temperature & humidity & pressure) and speed up the test process in the environment of unsaturated humidity (85%R.H.).

Test conditions: 110℃/85%R.H./264h

EVA-PCT pressure digester test:

Objective: The PCT test of EVA is to increase the environmental stress (temperature & humidity) and expose EVA to wetting vapor pressure exceeding one atmosphere, which is used to evaluate the sealing effect of EVA and the moisture absorption status of EVA.

Test condition: 121℃/100%R.H.

Test time: 80h(COVEME) / 200h(toyal Solar)

EVA and CELL bond tensile force test:

EVA: 3 ~ 6Mpa Non-EVA material: 15Mpa

Additional information from EVA:

1. The water absorption of EVA will directly affect its sealing performance of the battery

2.WVTR < 1×10-6g/m2/day(NREL recommended PV WVTR)

3. The adhesive degree of EVA directly affects its impermeability. It is recommended that the adhesive degree of EVA and cell should be greater than 60%

4. When the bonding degree reaches more than 60%, thermal expansion and contraction will no longer occur

5. The bonding degree of EVA directly affects the performance and service life of the component

6. Unmodified EVA has low cohesion strength and is prone to thermal expansion and contraction leading to chip fragmentation

7.EVA peeling strength: longitudinal ≧20N/cm, horizontal ≧20N/cm

8. The initial light transmittance of the packaging film is not less than 90%, and the internal decline rate of 30 years is not less than 5%

 

 

 

 

 

What are the High and Low Temperature Explosion-proof Devices?

Due to the particularity of the test product, during the test process, the test product may produce a large amount of gas in the high temperature or high pressure state, which may catch fire and explode. In order to ensure production safety, preventive safety protection devices can be used as optional equipment. Therefore, the high and low temperature test chamber needs to add special devices - explosion-proof devices when testing these special products. Today, let's talk about what are the high and low temperature explosion-proof devices.

1. Pressure relief port

When the air generated in the test chamber increases and the gas pressure in the chamber reaches a threshold, the pressure relief port automatically opens and releases the pressure outwards. This design ensures that when the system overpressure, the pressure can be released, thereby preventing the system from collapsing or exploding. The location and number of pressure relief ports are determined according to the specific fire extinguishing system design and application requirements.

2. Smoke detector

The smoke detector mainly realizes fire prevention by monitoring the concentration of smoke. The ionic smoke sensor is used inside the smoke detector. The ionic smoke sensor is a kind of sensor with advanced technology and stable and reliable operation. When the concentration of smoke particles in the chamber is greater than the threshold, it will sense and alarm to remind the production to stop operation and achieve the effect of preventing fire.

3. Gas detector

A gas detector is an instrument that detects the concentration of a gas. The instrument is suitable for dangerous places where combustible or toxic gases exist, and can continuously detect the content of the measured gas in the air within the lower explosive limit for a long time. The gas diffuses into the working electrode of the sensor through the back of the porous film, where the gas is oxidized or reduced. This electrochemical reaction causes a change in the current flowing through the external circuit, and the gas concentration can be measured by measuring the size of the current.

4. Smoke exhaust system

The air inlet of the pressurized fan is directly connected with the outdoor air. In order to prevent the outdoor air from being polluted by smoke, the air inlet of the supply fan should not be located at the same level as the air outlet of the exhaust machine. A one-way air valve should be installed on the outlet or inlet air pipe of the fan. Mechanical smoke exhaust system adopts smoke exhaust fan for mechanical exhaust air. According to relevant information, a well-designed mechanical smoke exhaust system can discharge 80% of the heat in the fire, so that the temperature of the fire scene is greatly reduced, and it has an important role in the safety of personnel evacuation and fire fighting.

5. Electromagnetic lock and mechanical door buckle

The electromagnetic lock uses the electromagnetic principle to achieve the fixing of the lock body, without the need to use a mechanical lock tongue, so the electromagnetic lock does not exist the possibility of mechanical lock tongue damage or forced destruction. The electromagnetic lock has a high anti-impact strength, when the external impact force acts on the lock body, the lock body will not be easily destroyed, and there will be certain protective measures when the explosion occurs.

6. Automatic fire extinguishing device

The automatic fire extinguishing device is mainly composed of four parts: detector (thermal energy detector, flame detector, smoke detector), fire extinguisher (carbon dioxide extinguisher), digital temperature control alarm and communication module. Through the digital communication module in the device, the real-time temperature changes, alarm status and fire extinguisher information in the fire area can be remotely monitored and controlled, which can not only remotely monitor the various states of the automatic fire extinguishing device, but also master the real-time changes in the fire area, which can minimize the loss of life and property when the fire occurs.

7. Indicator and warning light

Communicate equipment status or transmission status by visual and acoustic signals to machine operators, technicians, production managers and plant personnel.

 

What are the Safety Protection Systems of the High and Low Temperature Test Chamber?

1, Leakage/surge protection:Leakage circuit breaker leakage protection FUSE.RC electronic surge protection from Taiwan

2, The controller internal self-automatic detection and protection device

(1) Temperature/humidity sensor: The controller controls the temperature and humidity in the test area within the set range through the temperature and humidity sensor

(2) Controller overtemperature alarm: when the heating tube in the chamber continues to heat up and exceeds the temperature set by the internal parameters of the controller, the buzzer in it will alarm and need to be manually reset and reused

3, Fault detection control interface: external fault automatic detection protection Settings

(1) The first layer of high temperature overtemperature protection: operation control overtemperature protection Settings

(2) The second layer of high temperature and overtemperature protection: the use of anti-dry burning overtemperature protector to protect the system will not be heated all the time to burn the equipment

(3) Water break and air burning protection: humidity is protected by anti-dry burning overtemperature protector

(4) Compressor protection: refrigerant pressure protection and over-load protection device

4, Fault abnormal protection: when the fault occurs, cut off the control power supply and the fault cause indication and alarm output signal

5, Automatic water shortage warning: the machine water shortage active warning

6, Dynamic high and low temperature protection: with the setting conditions to dynamically adjust the high and low temperature protection value

    Acid transfer pumps are essential for transporting various acidic liquids and are widely used in industries such as chemicals, pharmaceuticals, and environmental protection. Choosing the right material is crucial for ensuring the pump's performance, durability, and safety. So, what materials are commonly used in acid transfer pumps? This article will provide an in-depth analysis of several popular materials and their applications, helping you select the most suitable acid transfer pump.

    1. Stainless Steel

    Stainless steel is a popular choice for acid transfer pumps due to its excellent corrosion resistance and oxidation protection. Specifically, 316L stainless steel is highly resistant to corrosion from most acidic liquids, making it ideal for the transportation of low to medium concentration acids. Stainless steel acid transfer pumps also offer heat resistance, ease of cleaning, and a long service life, making them ideal for industries such as chemicals and food processing.

    2. Fluoroplastics (F4, F46)

    Fluoroplastic is an exceptional corrosion-resistant material, capable of withstanding almost all strong acids and alkalis. Acid transfer pumps made from fluoroplastics can safely handle highly corrosive media like concentrated sulfuric acid, hydrochloric acid, and nitric acid. Fluoroplastic acid transfer pumps are highly popular in industries such as pharmaceuticals, chemicals, and environmental protection due to their high-temperature resistance and wear resistance, offering enhanced reliability.

    3. Fiber-Reinforced Polypropylene (FRPP)

    FRPP is a lightweight and relatively affordable material with solid corrosion resistance. Acid transfer pumps made from FRPP are particularly suitable for transporting low-concentration acidic liquids like phosphoric acid and acetic acid. Key advantages of FRPP include excellent chemical resistance, good impact strength, and ease of installation and maintenance, making it an economical option.

    4. Ceramic Materials

    Ceramic materials are renowned for their extreme resistance to corrosion and wear, particularly in the transport of acidic liquids containing solid particles. While ceramic pumps may be more brittle, their exceptional performance in highly corrosive and abrasive environments makes them a unique solution for specialized applications.

    5. Hastelloy

    For applications requiring the handling of high-temperature, high-concentration acids, Hastelloy is an exceptionally corrosion-resistant alloy. Acid transfer pumps made from Hastelloy can operate reliably in extreme environments and withstand severe acid and temperature conditions. Although these pumps tend to be more expensive, their excellent performance makes them widely used in demanding industries such as petrochemicals.

    6. Titanium Alloy

    Titanium alloy provides outstanding corrosion resistance, especially for transporting strong acids like aqua regia and hydrofluoric acid. Titanium alloy acid transfer pumps are lightweight, highly durable, and offer superior corrosion protection, making them ideal for the transport of highly corrosive liquids. These pumps are widely used in advanced industries such as aerospace and marine engineering.

    Different materials for acid transfer pumps are suitable for different acidic liquids and working environments. Choosing the right pump material not only extends the equipment's life but also increases operational efficiency and reduces maintenance costs. Whether you're looking for stainless steel, fluoroplastic, or specialized alloy acid transfer pumps, understanding the characteristics of each material will help you make an informed decision.

In the chemical industry, transferring corrosive liquids presents significant challenges. Chemical transfer pumps, as critical equipment, must possess excellent corrosion resistance to ensure system safety and operational stability. Selecting the right material is crucial for extending the pump's lifespan and improving production efficiency. Today, we will explore the common materials used in corrosion-resistant chemical transfer pumps and their applications.

1. Stainless Steel

Stainless steel (Stainless Steel Chemical Pumps)is one of the most commonly used materials in corrosion-resistant chemical transfer pumps. It offers excellent corrosion resistance, particularly when handling weak acids, weak alkalis, and other mildly corrosive liquids. Common stainless steel grades include 304, 316, and 316L, with 316L offering superior intergranular corrosion resistance due to its lower carbon content. Stainless steel pumps are suitable for industries such as chemicals, food processing, and pharmaceuticals, where corrosive media are frequently encountered.

2. High-Nickel Alloys

High-nickel alloys, such as Hastelloy and Inconel, perform exceptionally well in extreme corrosive environments. These materials provide outstanding resistance when handling strong acids, strong alkalis, and chloride-containing media. High-nickel alloy pumps are typically used in chemical processes requiring high corrosion resistance, such as the transfer of concentrated sulfuric acid, hydrofluoric acid, and phosphoric acid.

3. Plastic Materials

With advancements in technology, corrosion-resistant plastic materials (Plastic Chemical Transfer Pumps) are increasingly used in chemical pumps. Plastics like polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) are highly valued for their excellent chemical resistance, especially in high-purity chemical environments. Plastic pumps are commonly used to transfer highly corrosive, strong oxidizing media, such as strong acids, strong alkalis, and organic solvents.

4. Silicon Carbide and Ceramic Materials

Silicon carbide and ceramic materials are important choices in chemical pumps due to their superior wear resistance and corrosion resistance. These materials are particularly effective in reducing wear and extending pump life when transferring corrosive liquids containing solid particles. Silicon carbide pumps are mainly used for transferring high-hardness, highly corrosive fluids, such as concentrated acid and alkali solutions, and suspensions.

5. Rubber-Lined Pumps

For transferring strong acids, strong alkalis, or corrosive media containing particles, rubber-lined pumps offer an economical and effective solution. The pump body is lined with corrosion-resistant rubber, such as neoprene or fluoroelastomer, effectively isolating the media from contact with the metal pump body and preventing corrosion damage. Rubber-lined pumps are widely used in mining, chemical processing, electroplating, and other industries.

The material selection for corrosion-resistant chemical transfer pumps directly impacts the durability of the equipment and the safety of production. When purchasing, it is essential to choose the most suitable material based on factors such as the chemical nature of the transfer medium, operating temperature, and pressure conditions, to ensure optimal pump performance in specific applications. Our company is dedicated to providing high-quality corrosion-resistant chemical pumps, helping our customers achieve efficient and safe transfer solutions in demanding chemical environments.

If you are interested in changyupump products or have any questions, please feel free to contact our professional team. We are here to serve you.

Slurry pumps are widely used in industries such as chemical processing, metallurgy, and mining for transporting high-concentration, solid-containing corrosive media. However, during long-term use, slurry pumps often encounter some common failures. Understanding the causes of these failures and how to resolve them can help improve pump efficiency and reduce maintenance costs. This blog will outline several common slurry pump failures and their corresponding solutions.

1. Insufficient Pump Flow

Causes:

Impeller or flow path blockage, affecting the normal flow of the medium.

Air trapped inside the pump body or pipeline, leading to cavitation.

Air leakage in the suction line, causing insufficient negative pressure in the pump chamber.

Severe wear of the impeller or sealing ring, reducing pump efficiency.

Solutions:

Regularly clean the pump body and pipeline to ensure no blockages.

Fully vent the pump before starting to prevent air from entering the pump body.

Check for leaks in pipeline connections and repair any points of air leakage.

Replace worn impellers or sealing rings to restore normal performance.

2. Pump Fails to Start

Causes:

Power issues such as low voltage or poor circuit connections.

Foreign objects lodged inside the pump, preventing the pump shaft from turning.

Motor failure preventing the pump from running.

Mechanical seals are stuck or tightened, hindering rotation.

Solutions:

Check the power voltage and circuit connections to ensure proper electrical supply.

Open the pump and remove any foreign objects or check if the pump shaft is jammed.

In the case of motor failure, contact a technician for repair or replacement.

Lubricate or replace damaged mechanical seals to ensure smooth rotation.

3. Mechanical Seal Leakage

Causes:

Mechanical seals are worn or failing, resulting in poor sealing.

Improper installation of sealing components, creating gaps.

Large solid particles in the slurry causing long-term wear on sealing components.

Excessive operating temperatures leading to seal deformation or aging.

Solutions:

Replace worn or failed mechanical seals to ensure proper sealing performance.

Check if the seals are installed correctly and readjust if necessary.

Optimize slurry filtration to reduce the impact of large particles on seals.

Ensure the pump operates within the proper temperature range to prevent damage to seals.

4. Excessive Vibration and Noise

Causes:

Damaged or poorly lubricated bearings, leading to increased friction.

Misalignment between the pump shaft and motor shaft, causing imbalance.

Loose bolts causing instability during operation.

Air trapped in the medium, causing cavitation.

Solutions:

Regularly inspect and lubricate bearings, and replace worn ones when needed.

Adjust the alignment of the pump and motor shafts to ensure proper balance.

Check and tighten all bolts to prevent instability.

Prevent air from entering the pump and causing cavitation.

5. Decreased Pump Efficiency

Causes:

Severe wear of the impeller or internal pump components, reducing efficiency.

High solid content in the medium, increasing the pump’s load.

Poor hydraulic design leading to unstable operating conditions.

Lack of maintenance over time, causing performance degradation.

Solutions:

Regularly inspect the internal components for wear and replace damaged parts.

Optimize the handling process of the medium to reduce solid particle concentration and decrease pump load.

Analyze and adjust the pump's operating conditions to ensure the hydraulic design fits the application.

Implement a regular maintenance schedule to keep the pump running at optimal performance.

Conclusion

Slurry transfer pumps are powerful industrial transport tools, but they can experience common failures during prolonged use. Understanding the causes and solutions to these problems can not only extend the equipment's service life but also improve operational efficiency. Anhui Changyu Pump & Valve Manufacturing Co., Ltd. recommends users conduct regular inspections and maintenance based on actual working conditions to ensure the slurry pump remains in optimal working condition.

If you encounter any other issues during the use of your slurry pump, feel free to contact Anhui Changyu Pump & Valve Manufacturing Co., Ltd. for professional technical support and services.

    Magnetic pumps are widely used in industries such as chemicals, pharmaceuticals, and environmental protection due to their unique design that effectively prevents medium leakage. However, there is a significant operational limitation with magnetic pumps—they cannot run dry. So, why is it that magnetic pumps can't operate without liquid? This article will provide a detailed explanation.

    Working Principle of Magnetic Pumps

    To understand why magnetic pumps cannot run dry, it's essential to grasp their working principle. Magnetic pumps transfer power through magnetic coupling. Typically, the driving end and the driven end of the pump are connected via a magnetic coupling, and the impeller inside the pump rotates under the influence of this magnetic force, thereby propelling the medium to flow.

    Unlike traditional mechanical seal pumps, magnetic pumps have a completely sealed pump chamber with no shaft seals, which eliminates the possibility of leakage. This seal-free design makes magnetic pumps particularly suitable for applications that require high levels of sealing, especially when handling toxic, flammable, or corrosive media.

    The Dangers of Running Dry

    When a magnetic pump operates in a dry condition, meaning the pump chamber is devoid of any liquid medium, the magnetic coupling and other components inside the pump continue to rotate at high speed. This can lead to several problems:

    1.Overheating:

    Under normal operation, the liquid medium inside the pump acts as a lubricant and coolant. Without liquid, friction between components generates a significant amount of heat. Since the pump is designed to be completely sealed, the heat cannot dissipate quickly, potentially damaging the magnetic coupling and other critical components due to the rapid increase in temperature.

    2.Damage to the Magnetic Coupling:

When running dry, the magnetic coupling may overheat, leading to demagnetization or damage, causing it to lose its ability to couple magnetically. This not only results in the loss of the pump's drive function but also can lead to overall pump failure, which can be costly to repair or replace.

    3.Wear and Tear on the Impeller and Bearings:

    In a dry-running state, there is no liquid medium to reduce friction, causing direct contact between the impeller and bearings, leading to significant wear and tear. This drastically shortens the pump's lifespan and can even result in sudden pump failure.

    How to Prevent Dry Running?

    To ensure the safe and efficient operation of a magnetic pump, it's crucial to avoid dry running. Here are some common preventive measures:

    1.Install a Liquid Level Detection Device:

    A liquid level detection device can be installed in the pump's inlet pipe or storage tank. If the liquid level is too low, the device automatically stops the pump to prevent dry running.

    2.Set Up Pump Protection Devices:

    By installing pump protection devices, such as temperature sensors or flow sensors, the pump can automatically shut down if the internal temperature becomes abnormal or if the flow is insufficient, thereby protecting the pump from damage.

    3.Regular Inspection and Maintenance:

    Regularly inspect the pump's operating conditions to ensure there is always sufficient medium inside the pump, and conduct timely maintenance to prevent dry running due to worn-out components.

    Conclusion

    The primary reason magnetic pumps cannot run dry is that they rely on the liquid medium for cooling and lubrication. Without the medium, the pump's components can quickly overheat and wear out, potentially causing severe damage to the pump. Therefore, understanding and implementing preventive measures to ensure that magnetic pumps operate under the right conditions is key to extending equipment lifespan and ensuring safe production.

In the modern industrial landscape, environmental concerns have led to the development of various technologies aimed at reducing harmful emissions. One such technology is flue gas desulfurization (FGD), which is essential in minimizing sulfur dioxide (SO₂) emissions from power plants and industrial facilities. At the heart of this process lies the desulfurization circulation pump, a crucial component that ensures the effective removal of sulfur compounds from exhaust gases.

The Role of Desulfurization Circulation Pumps

Desulfurization circulation pumps are specifically designed to handle the transport of limestone or lime slurry, which is used in FGD systems. These pumps are vital for circulating the slurry through the system, allowing for continuous contact between the desulfurizing agent and the flue gas. This interaction facilitates the chemical reaction that converts sulfur dioxide into solid compounds, which can then be removed from the gas stream.

Working Principle

The working principle of a desulfurization circulation pump involves several key steps:

1. Slurry Preparation: The process begins with the preparation of a limestone or lime slurry, which serves as the desulfurizing agent. This slurry is typically mixed with water to create a homogeneous suspension.

2. Pumping the Slurry: The desulfurization circulation pump then transports this slurry to the absorber tower, where the flue gas enters. The pump is designed to handle the abrasive nature of the slurry, ensuring that it can operate continuously without failure.

3. Chemical Reaction: Inside the absorber tower, the sulfur dioxide in the flue gas reacts with the calcium carbonate (CaCO₃) present in the slurry. This reaction produces calcium sulfite (CaSO₃), which is a solid byproduct that can be further processed or disposed of.

4. Recirculation: After the chemical reaction, the remaining slurry is recirculated back to the pump for continued use. This closed-loop system enhances efficiency and minimizes waste, as the slurry can be reused multiple times.

Key Features and Benefits

Desulfurization circulation pumps are engineered to meet specific operational requirements, including:

• Corrosion Resistance: Given the corrosive nature of the materials handled, these pumps are typically made from corrosion-resistant materials such as stainless steel or specialized alloys. This ensures durability and longevity, even under harsh operating conditions.

• High Efficiency: These pumps are designed to operate efficiently, minimizing energy consumption while maximizing flow rates. Their ability to handle varying flow and pressure conditions is crucial for maintaining the stability of the desulfurization process.

• Reliability: With continuous operation being essential in FGD systems, desulfurization circulation pumps are built for reliability. Features such as mechanical seals and robust bearings help reduce the risk of leaks and failures.

Applications

Desulfurization circulation pumps are widely used in various industries, including:

• Power Generation: In coal-fired power plants, these pumps play a critical role in reducing SO₂ emissions, ensuring compliance with environmental regulations.

• Chemical Processing: Industries that produce or utilize sulfur compounds also rely on these pumps to mitigate emissions and enhance process efficiency.

• Cement Production: Cement plants often use desulfurization systems to control emissions from the combustion of fuels that contain sulfur, further emphasizing the importance of reliable circulation pumps.

In conclusion, desulfurization circulation pumps are essential components of flue gas desulfurization systems, playing a pivotal role in reducing sulfur dioxide emissions and promoting environmental sustainability. Their robust design, high efficiency, and ability to handle corrosive materials make them indispensable in various industries. As environmental regulations continue to tighten, the importance of effective desulfurization systems and the pumps that power them will only grow. Investing in high-quality desulfurization circulation pumps not only ensures compliance but also contributes to a cleaner, more sustainable future.

 

Magnetic pumps, designed for leak-free transportation of corrosive liquids, are widely used in industries such as petrochemicals, biopharmaceuticals, renewable energy, and environmental protection. Their core advantages lie in their simple structure, reliable operation, lack of seals, and zero leakage, making them particularly suitable for transporting flammable, explosive, toxic, or corrosive media. In this article, we will provide a detailed introduction to the basic structure and working principle of magnetic pumps.

I. Structure of Magnetic Pumps

The main components of a magnetic pump include the following key parts:

1.Pump Body

The pump body is the fundamental shell of the magnetic pump, responsible for containing and transferring the liquid. It is usually made from corrosion-resistant materials such as stainless steel, plastic, or alloys to handle various corrosive media.

2.Impeller

The impeller is the core component of the magnetic pump, connected to the internal magnetic rotor. It transfers the motor's kinetic energy to the fluid, generating kinetic energy and pressure. The impeller's design and material directly affect the pump's efficiency and performance.

3.Inner and Outer Magnetic Rotors

The drive system of the magnetic pump consists of an inner and an outer magnetic rotor. The outer magnetic rotor is connected to the motor shaft and rotates to generate a magnetic field; the inner magnetic rotor, fixed inside the pump and connected to the impeller, is driven by magnetic force, achieving non-contact torque transmission. This design keeps the pump chamber and drive components completely isolated, preventing media leakage.

4.Isolation Sleeve

The isolation sleeve is a crucial sealing element in the magnetic pump, typically made of corrosion-resistant and high-strength materials. Positioned between the inner and outer magnetic rotors, it ensures effective magnetic transmission while fully isolating the liquid in the pump chamber from the outside environment, ensuring zero leakage.

5.Bracket and Pump Shaft

The bracket supports the entire pump body, ensuring stable operation. The pump shaft connects the inner magnetic rotor and the impeller, ensuring the proper functioning of the rotating parts.

II. Working Principle of Magnetic Pumps

The working principle of magnetic pumps is based on magnetic coupling drive technology. The process can be summarized in the following steps:

1.Motor Drives the Outer Magnetic Rotor

When the motor starts, it drives the outer magnetic rotor via a coupling, causing the outer magnetic rotor to rotate and generate a magnetic field.

2.Magnetic Field Drives the Inner Magnetic Rotor

The magnetic field from the outer magnetic rotor passes through the isolation sleeve, driving the inner magnetic rotor to rotate synchronously. The inner and outer rotors are not mechanically connected, achieving torque transmission without contact.

3.Impeller Rotates with the Inner Magnetic Rotor

The inner magnetic rotor is fixed to the impeller, causing the impeller to rotate along with it. The fluid is drawn into the pump body, and the centrifugal force generated by the rotating impeller pushes the liquid out through the pump’s outlet.

4.Liquid Transportation

As the liquid enters the pump chamber, it is accelerated by the centrifugal force from the rotating impeller and expelled through the outlet, completing the fluid transfer process.

III. Application Fields of Magnetic Pumps

Magnetic pumps, due to their superior sealing performance and reliability, are particularly suited for use in the following fields:

• Chemical Industry: For transporting various corrosive liquids, acidic and alkaline solutions, and chemical reagents.
• Pharmaceutical Industry: For transferring high-purity pharmaceutical liquids, avoiding contamination.
• Renewable Energy Industry: Used in the transportation of battery liquids, liquid transfer in wind power equipment, etc.
• Environmental Protection Industry: For handling hazardous wastewater, chemical waste, and other harmful substances.

With their unique structural design and working principles, magnetic pumps are an ideal choice for transporting highly corrosive and hazardous liquids. Understanding the structure and working principle of magnetic pumps can help businesses select and utilize the right equipment to improve operational efficiency and safety. As a manufacturer of magnetic pumps, Changyu Pump & Valve is dedicated to providing high-quality magnetic pump solutions tailored to your specific needs.