Power plant dust collector

The power plant dust collector consists of a boiler, a flue gas cooler, a pre dust cyclone, and a bag filter. There are two flue gas coolers at the rear of the boiler, and the outlets of the two flue gas coolers are installed in parallel with two structurally identical pre dust collector inlet ducts and dust collector inlet ducts through flue gas cooler outlet elbows. The two pre dust collector inlet ducts and the dust collector inlet duct are respectively connected to the pre dust collectors of the two pre dust collector cyclones installed on the maintenance platform. The pre dust collector cyclones and the pre dust collector cyclones are respectively equipped with exhaust outlets connected to the exhaust duct elbows through exhaust duct flanges. The two exhaust ducts are connected to one end of the manifold through exhaust duct outlet flanges, and the other end of the manifold is connected to the inlet of the boiler bag filter; This utility model can solve the problems of high energy consumption and large maintenance of the dust removal system in biomass power plants, and can limit the wind resistance of this utility model within the output range of the induced draft fan, reducing the damage to the bag filter bag and the wear of the fan.

Common faults and technical measures of dust collectors in power plants, and handling measures after faults

The main reasons for the high pressure difference and the measures taken are as follows: 1. The main reasons for the high pressure difference in the dust removal bag are as follows:

A. Improper parameter settings of the pulse jet system can result in poor dust removal efficiency of the dust collector. For example, the pulse jet time of the dust collector bag is too long, the pulse injection width is too short, and the compressed air pressure is too low, which reduces the tension of the dust collector bag and the accumulation of dust on the dust collector bag. The parameters related to the pulse jet system should be reset.

The bagged material of the dust collector does not conform to the characteristics of dust, causing certain hole blockages. For dust with small particle size, high humidity, and high viscosity, PTFE impregnation treatment is used.

If the dust concentration processed by the system is too high and the filtration speed of the filter medium is too high, the pressure difference of the filter bag will be too large. Therefore, the dust removal load of the bag filter and the filtration speed of the filter medium should be appropriately reduced, that is, the filtration area should be increased and the filtration speed of the filter medium should be reduced.

2. Due to the wear of dust on the surface of the dust removal bag, over time, needle punched holes will appear in the dust collector bag. Sometimes, during the dust cleaning process, the dust removal bag will also be greatly damaged under the influence of high-pressure airflow, resulting in an increase in the concentration of gas dust emissions. When there is a large amount of dust in the airflow passing through the fan at high speed, the following measures should be taken to cause serious wear on the fan housing and impeller.

A. Choose the bag material for the dust collector to extend the service life of the bag.

Regularly check the wear of the filter bag, and promptly handle and replace any broken bags.

3. The main equipment of the dust collector is not tightly sealed, the connection between the pipe and shell is not tight, and the actual air volume is reduced, which affects the dust removal effect; If the cold air leaks, the dust gas processing capacity will increase, and the temperature of the dust gas will decrease, which will change the dew point of the dust gas and cause condensation; In addition, timely ventilation pipes, directional valves, and lift valves should be installed between the aging connections of the soft leather tubes to prevent damage and leakage.