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Environmental protection engineering construction

Environmental protection engineering construction
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  • Working principle of pulse bag filter

    The dusty gas enters the filter chamber from the ash hopper (or the open flange at the lower part), and the coarse particles directly fall into the ash hopper or the ash bin. The dusty gas is filtered by the filter bag, and the dust is trapped on the surface of the filter bag. The clean gas is discharged into the air through the bag mouth to the air purification chamber and the fan. When the dust on the surface of the filter bag increases continuously, causing the equipment resistance to rise to the set value, the time relay (or micro differential pressure controller) outputs a signal, and the programmer starts to work, Open the pulse valves one by one to make the compressed air blow the filter bag through the nozzle to clean the dust, so that the filter bag suddenly expands. Under the action of the reverse air flow, the dust attached to the surface of the filter bag quickly leaves the filter bag and falls into the ash hopper (or ash bin). The dust is discharged by the ash discharge valve. After all the filter bags are blown and cleaned, the dust collector resumes normal operation. During the normal operation of the pulse bag filter, the dusty gas enters the ash hopper from the air inlet. Due to the rapid expansion of the gas volume, part of the coarse dust particles fall into the ash hopper due to inertia or natural sedimentation, and most of the remaining dust particles rise with the air flow and enter the bag chamber. After being filtered by the filter bag, the dust particles are retained outside the filter bag. The purified gas enters the upper box from the inside of the filter bag, and then is discharged into the atmosphere through the valve plate hole and the air outlet, So as to achieve the purpose of dust removal. With the continuous filtration, the resistance of the dust collector also rises. When the resistance reaches a certain value, the ash removal controller sends out the ash removal command. First, close the poppet valve plate to cut off the filtered air flow; Then, the ash removal controller sends a signal to the pulse solenoid valve. As the pulse valve sends the high-pressure reverse air flow used for ash removal into the bag, the filter bag expands rapidly and generates strong shaking, which causes the dust outside the filter bag to shake off and achieve the purpose of ash removal. Since the equipment is divided into several box areas, the above process is carried out box by box. When one box area is cleaned, the remaining box areas are still working normally, ensuring the continuous and normal operation of the equipment. The reason why high concentration dust can be treated is that the cleaning time required for this strong cleaning is extremely short (only 0.1-0.2s is required for one injection).

  • Technical characteristics of pulse bag filter

    (1) No pre dedusting equipment is required, and it can process the smoke and dust with a concentration of up to 1000mg / m3 at one time, and the emission is less than 50mg / m3. The process flow is simple; (2) There is no need for blowing pipe in the bag room, and it is convenient to change bags outside the machine; (3) Embedded elastic bag mouth, good sealing performance; (4) The number of pulse valves is small, the ash cleaning intensity is large, and the action is rapid; (5) The whole machine is automatically controlled by microcomputer, and each parameter is easy to adjust, and no post work can be realized; (6) The service life of the filter bag is more than two years; (7) It is easy to realize isolation maintenance.

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