Device and method for depriving sulfur dioxide in flue gas by using ammonia water

A sulfur dioxide and flue gas technology, applied in chemical instruments and methods, fertilization devices, separation methods, etc., can solve the problems of blowing and collapse of packing, large maintenance workload, and increased flue gas flow rate, etc. The effect of good by-product quality and high desulfurization efficiency

Inactive Publication Date: 2010-12-01
武汉兴能环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that there is usually a lot of dust in the flue gas, and the saturated solution formed during the absorption process is very easy to form crystals on the surface of the packing, this will cause scaling and blockage in the packing
In the actual use of the packing absorption tower, the packing must be cleaned and replaced every year, and the maintenance workload is huge. In serious cases, the flue gas flow rate increases sharply due to the blockage of the packing, and the packing is blown over and collapsed.

Method used

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  • Device and method for depriving sulfur dioxide in flue gas by using ammonia water
  • Device and method for depriving sulfur dioxide in flue gas by using ammonia water

Examples

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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, an ammonia desulfurization absorption tower 6, circulation pump 9, discharge pump 10, cyclone 11, centrifuge 12, dryer 13, filtrate tank 14, filtrate pump 15, online filter 16, clear liquid pump 17. From bottom to top, it includes the tower bottom slurry pool 7 of the absorption tower, the spray layer 2, the packing layer 3, and the demister 4, wherein the spray layer 2 includes two layers of sprayers, and the packing layer 3 is a layer of packing; the absorption The middle part of the tower is located below the spray layer 2, and a flue gas inlet 1 is arranged above the slurry pool 7 at the bottom of the tower, and a flue gas outlet 5 is provided at the top of the absorption tower; the slurry pool 7 of the absorption tower is provided with an aeration pipe 8 The absorption tower 6 is provided with 2 circulation pumps 9 outside, and the outlet of each circulation pump 9 links to each other with the shower in one deck spray layer 2 respectively...

Embodiment 2

[0026]The rest are the same as in Example 1, except that the absorption tower spray layer 2 includes 3 layers of sprayers, and correspondingly, three circulation pumps 9 are correspondingly arranged outside the tower, and the outlet of each circulation pump 9 They are respectively connected to each sprayer in the spraying layer 2, and the inlet of each circulation pump 9 is connected to the slurry tank 7 at the bottom of the absorption tower respectively.

Embodiment 3

[0028] Flue gas from the boiler at a temperature of 130°C with a flow rate of 8.0×10 5 Standard cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 2800mg / Nm 3 , the dust content is 100mg / Nm 3 . The flue gas enters the absorption tower 6 from the flue gas inlet 1 of the absorption tower, and the flue gas rises in the absorption tower 6 and contacts the slurry sprayed by the spray layer 2 in countercurrent, mass transfer absorption and heat transfer occur, and the high-temperature flue gas evaporates into the slurry At the same time, the flue gas is rapidly saturated and cooled to 50-55°C, 60%-70% of the sulfur dioxide in the flue gas is absorbed, and 75%-80% of the dust is washed down by the sprayed slurry. The flue gas after cooling and dust removal continues to rise through the spray layer and enters the packing layer 3. The flue gas fully contacts with the absorbing liquid on the packing surface. The concentration is 30%-40%, the dust-free unsat...

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Abstract

The invention relates to a device and a method for depriving sulfur dioxide in flue gas by using ammonia water. The device comprises an absorption tower, wherein the absorption tower comprises a tower bottom pulp chest, spraying layers, packing layers and defrosters from bottom to top; the middle part of the absorption tower is arranged below the spraying layer, a flue gas inlet is arranged above the of the tower bottom pulp chest, and the top of the absorption tower is provided with a flue gas outlet; the tower bottom pulp chest of the absorption tower is internally provided with an aeration pipe; the absorption tower is externally provided with circulating pumps, the number of the circulating pumps accords with the number of layers for the spraying layers, an outlet of each circulating pump is respectively connected with spray throwers in the spraying layer in one layer, the defrosters are arranged in the upper part of the absorption tower and an inlet of each circulating is connected with the tower bottom pulp chest of the absorption tower; and the tower is externally provided with an in-line filter, and filtered unsaturated ammonium sulfate solution is taken as absorption liquids of the packing layers to thoroughly eliminate the possibility of filler scaling block. The method of the invention has the advantages of high deprivation efficiency, low liquid-air ratio, difficult scaling block, low content of ammonium sulfate particles and liquid drops contained in the flue gas from the outlets, good quality of secondary products and the like.

Description

technical field [0001] The invention belongs to the technical field of boiler tail gas and sintering machine flue gas treatment, and particularly relates to a new device and method for removing sulfur dioxide in flue gas by using ammonia water. Background technique [0002] At present, the method of ammonia removal of sulfur dioxide in flue gas mainly adopts the method of spray absorption. There are two main types of absorption towers: one is empty tower spraying. The empty tower type spray tower has a simple structure and is not easy to cause scaling and blockage. However, the disadvantage of this device is that the absorption efficiency is low. If the desulfurization rate of the desulfurization system is to be guaranteed, the spraying amount of the absorption liquid must be increased, that is, a larger liquid-gas ratio is adopted, which will inevitably lead to an increase in energy consumption of the entire device. In addition, the empty tower type spray tower is adopted, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50C01C1/24C05C3/00
Inventor 殷兴华殷茵
Owner 武汉兴能环保技术有限公司
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