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Spiral-flow type flue gas dedusting and demisting device

A demisting device and swirl-type technology, which is applied in the field of flue gas purification, can solve the problems of high cost, high operating cost, and low enthusiasm for wet electrostatic precipitators, and achieve the effect of low cost, low operating cost, and easy large-scale

Inactive Publication Date: 2015-10-28
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to research, a set of wet electrostatic precipitators equipped with one million units has an equipment investment of about 200 million yuan, and the annual operating cost is as high as 60 million yuan. Such high costs have led to the low enthusiasm of power plants for adopting wet electrostatic precipitators. Demonstration projects have only been carried out in a small number of power plants in China

Method used

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  • Spiral-flow type flue gas dedusting and demisting device
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  • Spiral-flow type flue gas dedusting and demisting device

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Embodiment 1

[0033] as attached figure 2 As shown, the original flue gas enters from the inlet flue 7 at the bottom of the absorption tower 9, and reacts in countercurrent contact with the limestone-gypsum slurry sprayed down from the spray layer 10, and then the flue gas carries a large number of droplets with a diameter of 1 to 1000 μm and Dust leaves the top of the spray layer and enters the swirling flue gas dust and mist removal device 11 of the present invention at a speed of about 4 m / s, and the purified flue gas leaves the absorption tower 9 through the outlet flue 12 .

[0034] Between the top of the spray layer and the outlet of the absorption tower, 3 layers of cyclone type flue gas dedusting and demisting devices 11 of the present invention are arranged, the layer spacing is 1.2m, the total height of each layer of devices H=60cm, diameter D=20cm, support rod The diameter is d=4cm, the distance between the swirl sheet and the wall is L=1cm, and the height difference between the...

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Abstract

The invention discloses a spiral-flow type flue gas dedusting and demisting device which comprises a supporting rod, a spiral-flow piece, a wall face, a water stop ring, a water outlet and a flushing device. According to the working principle, flue gas flows from bottom to top and is in a spiral rising flowing state in the dedusting and demisting device under the effect of the spiral-flow piece; in the state, drag force borne by small liquid drops and fine dust is not enough to provide centrifugal force needed by rotation, so that the small liquid drops and the fine dust move from a channel center to the wall face and touch a water film which perpendicularly flows downwards on the wall face before leaving the spiral-flow piece and are absorbed, and then the small liquid drops and the fine dust are removed. The spiral-flow type flue gas dedusting and demisting device has the advantages of being simple in structure and low in investment and running cost, and can efficiently remove small liquid drops and fine dust in flue gas.

Description

technical field [0001] The invention relates to a swirling flue gas dust and mist removal device, which belongs to the technical field of flue gas purification. Background technique [0002] At present, most domestic coal-fired boilers adopt the limestone-gypsum flue gas desulfurization process. The limestone-gypsum slurry is dispersed into small droplets through the spray device, and reacts with the flue gas in countercurrent contact in the absorption tower to achieve the removal of flue gas. SO 2 the goal of. Due to the different sizes of the limestone-gypsum slurry droplets formed by the nozzles used in this process, the droplet diameter distribution is usually between 1 μm and 10 mm. For the large droplets, due to the small drag force of the flue gas, they fall to the bottom of the absorption tower under the action of gravity after leaving the nozzle, and complete an absorption process; The drag force on it will far exceed the gravity, so it will be carried to the fol...

Claims

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Application Information

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IPC IPC(8): B01D45/16B01D50/00
Inventor 邹洋
Owner SHANGHAI BOILER WORKS
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