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Cause and solution of sloshing of Boiler induced Fan in Operation

Apr 22, 2019

The boiler induced fan has too small water injection volume or poor water quality, and the water distribution pipes and sieve holes are now different degrees of oscillation. After careful inspection and analysis, once the former dust removal water in the above elements has been selected as closed circuit circulating water, and after running for a period of time, six items have been checked. And easy to solve in the field. After opening the air turbine door, impurities in the water distribution water will block the distribution pipe and the sieve hole to varying degrees, and the dust deposited in the blade of the boiler induced fan is 3-4cm thick, and the ash accumulated on both sides of the wall that has not been removed from the three layers of sieve plate will also enter. The dust removal is affected by dust in the thickness of 10 cm, and the ash accumulated at the bottom of the volute can reach 30 to 40 cm. The primary key factor to form the oscillation of the induced fan is the dust sticking of the impeller when the dewatering power of the inner dehydrator is not high. The dehydrator is a vane structure. By changing the flow direction of the fluid to analyze the ash accumulation elements in the fan, the dewatering power of this structure is not high when the air flow is large. Generally speaking, according to the planned dust removal power, the flue splashing in the inlet section of the dust collector causes the accumulation of wet ash, which is brought into the fan through the fan duct into the chimney and discharged into the atmosphere, but the resistance of the flue gas is increased sharply, and then the flue gas is brought with water. Normal conditions should not be accumulated in the fan.

The following three factors can be considered: first, the flue gas that enters the induced fan with water; the secondary return ash tube of the boiler is connected to the tail flue, and the second one is the large amount of dust in the flue gas, and the second is the large amount of dust in the flue gas, and the second is the large amount of dust in the flue gas. The third is that a lot of fine ash is put into the tail flue when the vapor dew point in flue gas is high, and the exhaust temperature is caused by the precipitator. The ash content in the flue gas increases dramatically, which seriously affects the dust removal. A pressure gauge and a Flowmeter are installed on the water supply pipe of the precipitator in order to understand the working situation of the precipitator and to control the water-gas ratio within the range of 0.3 ~ 0.4l entry time, when the water-to-air ratio reaches to be both efficient and economical, and the quality of burning coal is poor (a > 30%). Improve water supply properly to avoid blockage of sieve holes.

The investigation hole is opened on the cylinder of the precipitator, the internal condition is investigated, and the pressure drop is measured regularly. After monitoring the change of the resistance of the precipitator, the pressure of the water supply, the change of the flow rate and the internal condition, the blocking condition of the water distribution pipe with the Open the door and clean with a high-pressure faucet nozzle if necessary. Change the secondary return ash discharge pipe from the original to the tail flue to the boiler zero meter, so as to reduce the dust removal amount of the dust collector. To measure the dew point of steam in flue gas, to ensure that the exhaust temperature can not be too low at low load, to adjust the operation form of boiler, and to eliminate the operation of boiler under too low load as far as possible. When the relative air volume is large, the amount of ash increases correspondingly, the air volume ratio is adjusted properly in operation, the air volume under different loads is explored, and the negative pressure of boiler is reduced, and the negative pressure value is adjusted from 30Pa to 100Pa or so. Add a mask to the dust collector's flue to avoid the accumulation of wet ash.www.jnblower.com