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A method for desulfurization and mercury removal of flue gas in a coal-fired thermal power plant

A thermal power plant, flue gas technology, applied in the field of flue gas desulfurization and mercury removal, can solve the problems of poor desulfurization and mercury removal efficiency, high content of sulfur and mercury components, and difficulty in industrialization, etc., to achieve excellent uniformity and powderization degree , reduce the effect of exclusion

Active Publication Date: 2019-06-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, some researchers use pyrolusite as raw material, prepare it into slurry, spray and absorb flue gas, or prepare pyrolusite into powder, and then carry out flue gas absorption treatment in a fixed bed reactor to realize Simultaneous desulfurization and mercury removal of flue gas, but its desulfurization and mercury removal efficiency is poor, so that the content of sulfur and mercury components in flue gas emissions is still high
[0005] Based on this, some researchers conducted research from the perspective of desulfurization and mercury removal agents, so that the desulfurization and mercury removal rate of flue gas reached more than 99%, but the active components used were silica and magnetic iron oxide Fe 21.333 o 32 , due to the magnetic iron oxide Fe 21.333 o 32 It requires special preparation and is difficult to purchase in the market, resulting in higher cost of the desulfurization and mercury removal agent, making it difficult to realize industrialization

Method used

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  • A method for desulfurization and mercury removal of flue gas in a coal-fired thermal power plant

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Experimental program
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Embodiment 1

[0037] A method for desulfurization and mercury removal of flue gas from a coal-fired thermal power plant, comprising the following steps:

[0038] (1) Take the pyrolusite, treat the pyrolusite with microwave radiation for 30 minutes, the microwave radiation power is 60W, and then heat it to 300°C, then add water to make it pulverized, and continue to add water until the liquid-solid ratio is 5:1, get the pulp;

[0039] (2) Add chitosan and thiosemicarbazide to the ore pulp, the chitosan addition is 1% of the pyrolusite quality, and the thiosemicarbazide addition is 13% of the pyrolusite quality, after it is stirred evenly, adjust the temperature Treat at 50°C for 10 minutes, add water, adjust the liquid-solid ratio to 9:1, and obtain a liquid desulfurization and mercury removal agent;

[0040] (3) The flue gas from the coal-fired thermal power plant is introduced from the bottom of the spray absorption tower at a flow rate of 5L / min, and the liquid desulfurization and mercur...

Embodiment 2

[0044]A method for desulfurization and mercury removal of flue gas from a coal-fired thermal power plant, comprising the following steps:

[0045] (1) Take the pyrolusite, treat the pyrolusite with microwave radiation for 40 minutes, the microwave radiation power is 90W, and then heat it to 400°C, then add water to make it pulverized, and continue to add water until the liquid-solid ratio is 8:1, get the pulp;

[0046] (2) add chitosan and thiosemicarbazide to the ore pulp, chitosan addition is to account for 5% of pyrolusite quality, and thiosemicarbazide addition is to account for 21% of pyrolusite, after it is stirred evenly, adjust temperature Treat at 70°C for 20 minutes, add water, adjust the liquid-solid ratio to 13:1, and obtain a liquid desulfurization and mercury removal agent;

[0047] (3) The flue gas from the coal-fired thermal power plant is introduced from the bottom of the spray absorption tower at a flow rate of 8L / min, and the liquid desulfurization and merc...

Embodiment 3

[0053] A method for desulfurization and mercury removal of flue gas from a coal-fired thermal power plant, comprising the following steps:

[0054] (1) Take the pyrolusite, treat the pyrolusite with microwave radiation for 35 minutes, and the microwave radiation power is 80W, then heat it to 350°C, add water to make it pulverized, and continue to add water until the liquid-solid ratio is 7:1, get the pulp;

[0055] (2) Add chitosan and thiosemicarbazide to the ore pulp, the chitosan add-on is to account for 3% of the pyrolusite quality, and the thiosemicarbazide add-on is to account for 17% of the pyrolusite, after it is stirred evenly, adjust the temperature Treat at 60°C for 15 minutes, add water, adjust the liquid-solid ratio to 11:1, and obtain a liquid desulfurization and mercury removal agent;

[0056] (3) The flue gas from the coal-fired thermal power plant is introduced from the bottom of the spray absorption tower at a flow rate of 7L / min, and the liquid desulfurizat...

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Abstract

The invention relates to the technical field of flue gas desulfurization and demercuration, in particular to a flue gas desulfurization and demercuration method for a coal-fired power plant. Pyrolusite is used as a raw material for preparing ore pulp and is subjected to a microwave radiation treatment, so that the pyrolusite is activated, the activation energy of pyrolusite active ingredients in an oxidation reaction process is lowered, the oxidation of sulfur dioxide and mercury molecules is improved, and the transformation of the mercury molecules into mercury ions is promoted; in the ore pulp preparation process, hydrothemal treatment is conducted, so that the powdering degree of the pyrolusite is comparatively excellent, the uniformity is better after the pyrolusite is prepared into the ore pulp, and full contact of the pyrolusite with flue gas is achieved; by the addition of chitosan and aminothiourea, ingredients with the complexing function are contained in the ore pulp, the complexing of the mercury ions is achieved in the contact reaction process, mercury exclusion is reduced, and the removal rates of sulfur and mercury both reach 88% or above.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization and mercury removal, in particular to a method for flue gas desulfurization and mercury removal in coal-fired thermal power plants. Background technique [0002] Coal is one of the main energy sources in my country, accounting for about 70% of the country's Xici energy output. Under the premise of such abundant coal resources, there will still be a large number of thermal power plants in my country in the short term. However, coal contains a large number of harmful components, among which sulfur and mercury components are more prominent, and the sulfur components are mainly in the form of The form of sulfur dioxide exists in the flue gas, and after the flue gas is discharged into the environment, it is easy to cause the formation of acid rain; the form of mercury in the flue gas is relatively rich, including ionic and molecular forms. Toxicity, if it is discharged into the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/64
CPCB01D53/06B01D53/1481B01D53/1493B01D53/507B01D53/64B01D53/80B01D2251/10B01D2251/602B01D2252/2056B01D2253/202B01D2257/602B01D2258/0283
Inventor 陈肖虎刘利黄碧芳金会心陈庆唐道文赵平原王丽远鲁圣军黎志英
Owner GUIZHOU UNIV