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Flue gas desulfurization and mercury removal device and method

A flue gas and mercury removal technology, which is applied in the direction of separation methods, chemical instruments and methods, and mercury compounds, can solve the problems of high cost of flue gas desulfurization and mercury removal, achieve high desulfurization and mercury removal effects, simple devices, and improve costs Effect

Active Publication Date: 2018-06-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a flue gas desulfurization and mercury removal device and method to solve the problem of high cost of flue gas desulfurization and mercury removal in the prior art

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  • Flue gas desulfurization and mercury removal device and method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0051] Taking the flue gas produced by a coal-to-liquid enterprise in Ningxia Hui Autonomous Region as the processing object, install an oxidation slurry spray device, a desulfurization slurry spray device, a hydrogen sulfide gas spray device and a bag filter in the chimney. The structure is as follows figure 1 As shown, where

[0052] The oxidizing slurry includes hypochlorous acid, sodium chloride, calcium bromide and water. The molar ratio of hypochlorous acid, sodium chloride and calcium bromide is 1:2:3, and the mass concentration of hypochlorous acid is 20%;

[0053] The desulfurization slurry includes calcium hydroxide, limestone and water, the weight ratio of calcium hydroxide to limestone is 3:2, and the mass concentration of calcium hydroxide is 20%;

[0054] The bag filter is provided with an adsorption packing layer of brominated activated carbon.

[0055] After stable operation, the average mercury removal rate of flue gas was 94.3%, and the average desulfurization rate w...

Embodiment 2

[0057] Taking the flue gas produced by a coal-to-liquid enterprise in Ningxia Hui Autonomous Region as the processing object, install an oxidation slurry spray device, a desulfurization slurry spray device, a hydrogen sulfide gas spray device and a bag filter in the chimney. The structure is as follows figure 1 As shown, where

[0058] The oxidizing slurry includes hypochlorous acid, sodium chloride, calcium bromide and water. The molar ratio of hypochlorous acid, sodium chloride and calcium bromide is 1:1.5:2.5, and the mass concentration of hypochlorous acid is 20%;

[0059] The desulfurization slurry includes calcium hydroxide, limestone and water, the weight ratio of calcium hydroxide to limestone is 2:1, and the mass concentration of calcium hydroxide is 20%;

[0060] The bag filter is provided with an adsorption packing layer of brominated activated carbon.

[0061] After stable operation, the average mercury removal rate of flue gas was 93.9%, and the average desulfurization ra...

Embodiment 3

[0063] Taking the flue gas produced by a coal-to-liquid enterprise in Ningxia Hui Autonomous Region as the processing object, install an oxidation slurry spray device, a desulfurization slurry spray device, a hydrogen sulfide gas spray device and a bag filter in the chimney. The structure is as follows figure 1 As shown, where

[0064] The oxidizing slurry includes hypochlorous acid, sodium chloride, calcium bromide and water. The molar ratio of hypochlorous acid, sodium chloride and calcium bromide is 1:2.5:3.5, and the mass concentration of hypochlorous acid is 20%;

[0065] The desulfurization slurry includes calcium hydroxide, limestone and water, the weight ratio of calcium hydroxide to limestone is 1:1, and the mass concentration of calcium hydroxide is 20%;

[0066] The bag filter is provided with an adsorption packing layer of brominated activated carbon.

[0067] After stable operation, the average mercury removal rate of flue gas was 92.5%, and the average desulfurization ra...

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Abstract

The invention provides a flue gas desulfurization and mercury removal device and method. The device comprises a flue gas channel, an oxidized slurry spraying device, a desulfurized slurry spraying device and a hydrogen sulfide gas jetting device, wherein the flue gas channel is used for providing flue gas; the oxidized slurry spraying device is arranged in the flue gas channel and is used for spraying oxidized slurry into the flue gas channel and oxidizing mercury in the flue gas into divalent mercury; the desulfurized slurry spraying device is arranged in the flue gas channel and is used forspraying desulfurized slurry into the flue gas channel and absorbing SO2 in the flue gas; the hydrogen sulfide gas jetting device is arranged in the flue gas channel and is used for jetting hydrogen sulfide gas into the flue gas channel and converting the divalent mercury into mercury sulfide. By adopting the device provided by the invention, desulfurization and mercury removal combined treatmentcan be carried out on the flue gas at the same time; the device is simple and convenient to operate and the occupied land is saved; the current flue gas desulfurization and mercury removal treatment cost can be effectively improved. Meanwhile, the device has relatively good flue gas desulfurization and mercury removal effects.

Description

Technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a flue gas desulfurization and mercury removal device and method. Background technique [0002] Mercury is a toxic heavy metal trace element in coal. Mercury pollution causes great harm to humans and the biological environment. The total amount of mercury released into the atmosphere every year in the world is about 5000t, of which 4000t is the result of man-made, and mercury emissions from coal chemical industry and coal combustion are the main sources of pollution. [0003] The sulfur element in coal is also one of the main factors causing air pollution. Coal chemical production and coal combustion process will produce a large amount of sulfur dioxide (SO 2 ), SO 2 It is toxic, can cause human respiratory diseases, a large amount of SO 2 It can also cause a wide range of acid rain. [0004] The existing mercury removal and desulfurization technical methods are to separate me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/80B01D53/64B01D53/50C01G13/00
CPCB01D53/502B01D53/64B01D53/75B01D53/80B01D2251/108B01D2251/404B01D2251/604B01D2251/606B01D2257/602B01D2258/0283C01G13/00
Inventor 刘永张驰黄金金韩来喜薄宏岩高进秦光书贾振斌李海军李小强刘德森王永胜
Owner CHNA ENERGY INVESTMENT CORP LTD
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