Dust removal method and device based on chemical agglomeration and split linked anode electric dust removal

Abstract

The invention discloses a dust removal method and a dust removal device based on chemical agglomeration and split linked anode electric dust removal. An agglomerating agent solution is sprayed into an inlet flue of an electric dust remover through a double-fluid atomizing nozzle, compressed air is also sprayed into the inlet flue, and a polymer binder is connected with fine dust through a polymer long chain with a polar group, so that the particle size of the fine dust is increased, and the fine dust enters an electric dust removal unit to be removed. By the method and the device, dust removal performance can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of flue gas dust removal, and in particular relates to a compound dust removal method and a device thereof based on chemical agglomeration and split linkage anode type electric dust removal. Background technique [0002] The electrostatic precipitator is a kind of flue gas purification equipment widely used at home and abroad. The main form is the plate type. The pole plate and pole line are fixed on the overall frame and cannot be rotated. The dust collected by the polar plate and the polar line is mainly cleaned by rapping. In the process of rapping and cleaning, on the one hand, the dust on the plate is often not completely removed, and at the same time, the dust generated during the rapping process is easily carried out by the air flow, resulting in secondary dust. In addition, due to the insufficient charging of the fine dust in the range of 0.1-1.0 μm, there is a particle penetration window. In the es...

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Problems solved by technology

[0004] (1) Electric field expansion transformation: increase the dust collection area by increasing the size of the electrostatic precipitator body; this measure needs to increase the floor area, the transformation cost is large, and the efficiency improvement effect is not obvious

[0005] (2) Electrocoagulation + conventional electrostatic precipitator: Before the dusty flue gas enters the electrostatic precipitator, it is charged separately, so that the dust in the adjacent two columns of flue gas is charged with positive and negative polarities. Charge, the dust with opposite charges will condense and grow up, and then enter the electrostatic precipitator; the electrocoagulation technology has the conditions for industrial application, which can effectively improve the removal effect of the electrostatic precipitator on fine dust, but there are still back corona, secondary dust and other problems, and the investment and operation costs are too high. At present, only a few coal-fired power plants in the world have applied this technology

[0006] (3) Flue gas conditioning + conventional electrostatic precipitator: by injecting SO into the inlet flue of the electrostatic precipitator 3 , NH 3 Equal drop resistivity agent, which reduces the dust specific resistance to the most suitable range for electrostatic precipitators (10 4 ~10 11 Ω·cm); this measure can only solve the problem of back corona caused by dust with high specific resistance

[0007] (4) Change to electrostatic bag composite dust collector: keep one or two electric fields before the electrostatic precipitator, and change the electric fields of the latter stages to bag dust removal, the dust removal efficiency can be significantly higher than that of the electrostatic precipitator; but the electrostatic collection area and bag filter It is difficult to maintain the synergistic effect of the area for a long time. In practical applications, the dust removal efficiency often fluctuates and bag breakage occurs, and the investment and operation costs are relatively high.

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