An ultra-low emission dust removal device and ash removal method

Abstract

The present invention is an ultra-low emissions dust-removal apparatus and an ash removal method thereof. According to the apparatus, a dust removal device is divided into a plurality of filtration chambers, the upper portions of the filtration chambers are communicated with a gas inlet channel and are provided with gas inlet valves, the middle portions of the filtration chambers are communicated with a gas outlet channel and are provided with gas outlet valves, a vertical filtration bag is arranged between two tubesheets, an ash hopper is arranged below the lower tubesheet, and the internal of the filtration bag is communicated with the ash hopper. The ash removal method of the apparatus comprises: closing the gas inlet valve, maintaining the gas outlet valve at the opening state, closing the gas outlet valve after a few seconds, opening the gas inlet valve after a few seconds, closing the gas inlet valve for a few seconds after opening the gas inlet valve for a few seconds, and then opening the gas outlet valve so as to complete the one ash removal period. The apparatus has advantages of simple equipment, low maintenance workload, low operation and maintenance cost, and long filtration bag service life. According to the ash removal process, the pressures on both sides of the filtration bag produce the fluctuation through the opening and the closing of the gas inlet valve and the gas outlet valve so as to make the filtration bag deform and shake to form the self-cleaning type ash removal way having the ash removal effect, such that the operating energy consumption is substantially reduced.

Description

technical field [0001] The invention belongs to the technical field of dust removal and filtration, and in particular relates to an ultra-low emission dust removal device and a dust removal method. Background technique [0002] At present, the mainstream technologies for reducing the emission concentration of smoke and dust and improving the efficiency of the dust removal system include wet electrostatic precipitator technology, low-temperature electrostatic precipitator technology, and bag filter technology. [0003] The wet electrostatic precipitator is usually arranged after the desulfurization absorption tower, which can effectively remove the soot particles PM2.5, SO 3 Pollutants such as micro-droplets, mercury, and desulfurized gypsum droplets carried in the flue gas after the demister are an efficient electrostatic precipitator. Unlike the dry electrostatic precipitator, which vibrates the ash on the plate to the ash hopper, the wet electrostatic precipitator sprays ...

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Problems solved by technology

In this way, under the condition of the same floor area, the effective filtration area of ​​the dust collector is relatively low, and the filtration wind speed is relatively high, which makes the filtration efficiency of the filter relatively low, the dust emission concentration is relatively high, and the equipment operation resistance is relatively high.

[0016] In addition, due to the external compressed air used in the existing pulse ash removal air source, the ash removal energy consumption is relatively high

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