Power Plant Use Long Bag Pulse Bag Filter Baghouse Dust Collector

70% of coal-fired boiler flue gas in thermal power plants uses electrostatic precipitators, but with the strict emission standards, the application rate of bag filters has rapidly increased. The newly built 200,000 kilowatts and 300,000 kilowatts units use more baghouse dust collectors, and several 600,000 units use baghouse dust collectors. The large-scale work of the low-pressure long-bag pulse bag dust collector has progressed rapidly. The stand-alone processing capacity can reach 4 million m3/h, and the emission concentration can generally be controlled below 20 mg/m3. There are two main types of baghouse dust removal technologies in power plants. One is long-barrel low-voltage pulse technology, and the second is a successful example of low-voltage rotary blowing technology represented by the German Lurgi Company, both at home and abroad (such as Australia and the United States). And other countries), electrostatic dust removal bag type dust collector is often used in the form of low pressure long bag pulse bag filter. The filter material used in power plant bag filter is mainly PPS, PPS+PTFE.

Combine the successful experience of domestic and foreign dust-removing and electric bag-changing, aiming at the intrinsic characteristics and requirements of the transformation project, while maintaining the capacity of the treatment of flue gas, the original electrostatic precipitator equipment's main structure and shell are retained for use, and electrostatic dust removal is adopted for bag-type dust removal. Low pressure long bag pulse bag filter form.

(1) The basic structure of the dust collector. According to the operation of the power plant boiler and the original equipment, the dust collector determines the selection of long bag low pressure pulse bag filter with negative pressure operation, on-line cleaning and off-line maintenance structure, divided into 12 units, and the inlet and outlet flue are divided into four channels. , Each road is connected to 3 filter rooms and 13 ashing rooms.

(2) The working principle of the dust collector. The structure of the dust collector body is the side-in side-out, the dust-containing flue gas is formed by the wedge-shaped channel of the dust-removing device (to ensure the distribution of the air flow), enters the lower box body and the ash bucket of the dust-removing device through the air-flow distribution plate, and then passes through the ash bucket. In the lower static pressure zone of the lower case, the diffuser is distributed evenly into the filter zone. When the flue gas passes through the filter bag, the dust is trapped on the outer surface of the wave bag. The purified flue gas enters the clean room through the filter bag mouth and is discharged from the air outlet passage. The dust guiding device in the dust removal body can ensure the distribution of the smoke gas. Uniformity. Extend the life of the filter bag.

After the precipitator is operated for a period of time, the filtration resistance of the filter bag will increase due to the increase of dust retention in the bag, and the filter bag will be cleaned by the precipitator. The automatic control system executes the automatic pulse injection from room to room according to the set (differential pressure or time) control program. The collected dust is collected in the ash bucket. The ash discharge valve is used to unload the lower ash conveying system. The low-pressure online pulse dust collector automatically repeats the control procedure during the operation to ensure that the dust-containing flue gas dust is discharged after reaching the standard.