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The bag filter pulse valve is the core component of its ash cleaning system. Its anti-clogging design is crucial for ensuring the normal operation and efficient ash cleaning of the dust collector.

I. Structure and Working Principle of Pulse Valves

A pulse valve is a switch device that controls compressed air through an electromagnetic valve. Its main function is to release compressed air instantaneously to form an air pulse, causing the filter bag to expand and impact violently, thereby achieving dust cleaning. According to different structural forms, pulse valves can be classified into three types: right-angle type, straight-through type and submerged type. Among them, the submerged pulse valve is widely used in low-pressure situations due to its simple structure, low resistance, good fluidity and excellent injection effect. In addition, the diaphragm life of a pulse valve is an important indicator for evaluating its performance. Under normal usage conditions, the diaphragm's service life should be greater than one million times or three years.

Ii. Anti-clogging Design of Pulse Valves

1. Cleaning and maintenance of air tanks

The air tank is an important component of the pulse valve's gas supply. If it contains impurities such as rust and dust inside, it will cause the small diaphragm to be blocked, affecting the normal closing of the valve. Therefore, the design and maintenance of the air tank are of vital importance. For instance, Kaida Dust Collector Accessories Co., Ltd. points out that the shape design of the gas storage tank should be square or round to ensure uniform and sufficient gas supply. Meanwhile, a water drain valve should be installed at the bottom of the air tank to facilitate regular drainage and prevent the accumulation of impurities. In addition, when installing, it is necessary to avoid installing the submerged pulse valve at the lower part of the air tank to prevent affecting the injection effect.

2. Selection of diaphragms and sealing performance

The diaphragm is a key component of the pulse valve, and its performance directly affects the ash cleaning effect. If the diaphragm malfunctions, it will lead to a decline in the dust cleaning effect and even affect the normal operation of the dust collector. Therefore, the selection of diaphragms and their sealing performance must be strictly controlled. For example, the DMF-Z type electromagnetic pulse valve is made of high-quality materials and has good anti-corrosion performance. It is suitable for dust cleaning of various filter elements such as filter bags and filter cartridges. Meanwhile, sealing packing should be used during installation to ensure reliable sealing. In addition, the diaphragm life of the pulse valve should meet the standard requirements to ensure long-term stable operation.

3. Optimal design of the injection system

The design of the injection system directly affects the anti-clogging effect of the pulse valve. For example, the blow pipe should have reliable positioning and fixing devices, and be easy to disassemble and install. Meanwhile, the nozzle of the blowing pipe should adopt an arc-shaped stretching design to reduce the blowing resistance and ensure that the airflow error passing through each nozzle is small. In addition, the elbow part of the blowing pipe should be exposed outside the clean air outlet to facilitate construction and installation. By optimizing the structure of the injection system, the possibility of impurities entering the injection port can be effectively reduced, thereby lowering the risk of blockage.

4. Explosion-proof and anti-static design

In flammable and explosive environments, such as wood chip boilers, rice husk boilers, and aluminum recycling furnaces, the explosion-proof design of bag-type dust collectors is particularly important. For instance, flame-retardant and anti-static filter bags should be selected for pulse bag filters to prevent explosions caused by static sparks. Meanwhile, dust accumulation should be avoided inside the dust collector. The designed inclination Angle should be greater than 70° to prevent spontaneous combustion caused by the deposition of coal powder. In addition, a pressure relief device should be installed. Once the pressure rises to a certain limit, the pressure relief device will be activated to release the pressure and prevent the occurrence of explosion accidents.

Iii. Installation and Commissioning of Pulse Valves

The installation and commissioning of pulse valves are also important links in the anti-clogging design. For instance, during installation, it is necessary to ensure that the input end of the electromagnetic pulse valve is connected to the connecting pipe on the air distribution box, and the output end is connected to the blowing pipe of the dust collector. Sealing packing should be used to ensure reliable sealing. At the same time, when installing, it is necessary to avoid screwing in the thread at the air intake end too long to prevent affecting the injection volume. In addition, a pneumatic test should be conducted after installation to ensure good sealing.

Iv. Maintenance and Management of Pulse Valves

The maintenance and management of pulse valves are crucial for extending their service life and ensuring the anti-clogging effect. For example, the operation conditions of control valves, pulse valves and timers, etc. should be checked regularly to ensure their normal operation. Meanwhile, impurities in the air tank should be cleaned regularly to prevent the small diaphragm from being blocked. In addition, the fixation of the filter bags should be checked regularly to ensure that the tension of the filter bags is appropriate, so as to avoid a decline in the dust cleaning effect due to loose or worn filter bags.

V. Summary

The anti-clogging design of the bag filter pulse valve involves multiple aspects, including the cleaning and maintenance of the air tank, the selection and sealing of the diaphragm, the optimized design of the injection system, explosion-proof and anti-static design, as well as installation and commissioning, etc. Through scientific and reasonable anti-clogging design, the service life of the pulse valve and the dust cleaning effect can be effectively prolonged, ensuring the normal operation and efficient dust removal of the bag filter. Meanwhile, regular maintenance and management are also important guarantees to ensure the effectiveness of the anti-blocking design.

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Shanghai Bag Filtration Equipment Co., Ltd.

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