Coking plant dust collector

The tar smoke purified by the dust collector in the coking plant is collected and burned by the smoke collection vehicle, and then flows into the dust removal main pipe. It then enters the fire extinguishing cooler for cooling through the dust removal pipeline of the dust removal ground station, and is purified by the flame retardant pulse dust collector. The tar smoke is extracted by the dust removal fan, and the standard gas is discharged into the atmosphere through the chimney. Due to the use of a comprehensive dust removal system, this equipment is highly targeted and systematic, and can control the dust generation of the entire production line. It is estimated that after the equipment operates normally, the overall dust control rate on site is good and meets the new environmental requirements.

The dust collector system of the coking plant adopts PLC automatic control technology, which is centrally monitored by the control room in the dust removal ground station. At the same time, manual control switches are also installed for easy maintenance. The characteristic of this system is the integration of coal loading and coke discharge dry dust removal technology, which combines coal loading dust removal and coke discharge dust removal into one dust removal system. The coke powder adsorbed on the filter bag during the coke discharge dust removal process is used as a coating to prevent tar and dust sucked into the flue gas during the coal loading process from directly contacting the filter bag. The coke dust removal and coal loading dust removal operate alternately, and the filter bag can be used for a long time without being stuck or blocked.

The dust removal system of the coking plant dust collector consists of a centrifugal fan, a pulse bag filter, a frequency converter, an instrument system, a circulating cooling water system, an ash conveying and discharging system, a compressed air system, and a pipeline system. In the coking production process, smoke and dust are sucked into the dust removal main pipe through a conduit, and the large particle dust is separated in the regenerative cooling fire extinguisher (gravity dust collector) and directly flows into the ash hopper. After the smaller dust enters the middle box of the bag filter uniformly, it is adsorbed on the outer surface of the filter bag. The dusty gas is filtered by the filter bag and enters the clean air chamber, and is discharged into the atmosphere through the exhaust pipe. When the resistance of the filter bag reaches the limit value of 1500Pa, the cleaning device opens the electronic pulse blowing according to the differential pressure program. At this time, the compressed air shakes off the dust attached to the surface of the filter bag, and is discharged through the ash hopper by the ash discharge mechanism.

During the operation of the dust collector in the coking plant, factors such as the selection of filter material for the dust removal bag, the temperature and oxygen content of the flue gas in the working environment, etc. will greatly affect the actual service life of the filter bag, leading to the burning and wear of the dust removal bag, and frequent replacement.

1、 Burning: The main reason for the burning of the dust collector bag is that the initial layer thickness on the surface of the dust collector bag is insufficient, and the temperature of the flue gas is too high. If the temperature of the flue gas processed by the dust collector exceeds the working conditions of the bag, it is easy to cause the dust bag to harden, shrink, or melt, resulting in holes. If the initial layer thickness of the dust collector bag is not sufficient, sparks in the flue gas may flow in or the dust may heat up, which may also cause the dust collector bag to burn out holes. The burning of dust removal bags is mainly reflected in the replacement of dust removal bags online. If the dust collector bag is not pre coated with dust after online replacement, the high-temperature flue gas carrying sparks can directly touch the bag, which can also easily cause the dust collector bag to be burned. The initial layer thickness on the surface of the dust removal bag and the exhaust temperature not exceeding the limit can prevent the dust removal bag from burning out.

2、 Wear and tear: The wear of dust removal bags mainly occurs in the middle part of the dust collector. The main reason is uneven distribution of flue gas, with high flow velocity in the middle of the single chamber, causing dust to impact the dust collector bag and wear it out; It also damages the tension of the fabric fibers in the dust removal bag, which can easily lead to local perforation of the bag and a short service life. We need to replace the frequently worn dust bag with a new one.

3、 The distance between the dust removal bag and the dust removal skeleton is too small or too large, which can easily cause wear and tear on the bag. The difference in diameter between the cloth bag and the keel is too small, and the dust removal cloth bag has poor effect; When it is too large, the friction between the bag and the keel increases, which can cause wear on the dust removal bag. Some dust removal bags may vary greatly with temperature and have the characteristic of elongation, which requires our special attention.

4、 When there are holes or burrs at the welding point of the dust removal skeleton, or when the surface becomes rough due to smoke and dust corrosion, it will also accelerate the wear of the dust removal bag. Poor sealing between the cloth bag and the porous plate can also cause wear and tear at the top of the bag due to wrinkles.

5、 Excessive filtering gas velocity of the dust collector can cause the initial dust layer to break, resulting in dust impacting the bag and causing excessive wear of the dust removal bag. Excessive dust accumulation in the smoke and small ash hopper can also accelerate the wear and tear of the cloth bag.