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Method for wet desulphurization in CFB boiler

A technology of wet desulfurization and boiler furnace, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of equipment operation and maintenance personnel, high desulfurization operation cost, and poor operation reliability, etc., and achieve a good society and economic benefits, reducing secondary pollution, and reliable operation

Inactive Publication Date: 2017-07-07
孙宽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problems of large construction investment, complex system, large water consumption, high price and large amount of limestone, high desulfurization operation cost, poor operation reliability, and many equipment operation and maintenance personnel in the existing CFB boiler furnace wet desulfurization technology , the purpose of the present invention is to provide a new CFB boiler furnace wet desulfurization method, which has the advantages of less equipment investment, simple operation, remarkable desulfurization effect, and can reduce the secondary pollution of desulfurization agent or desulfurization sewage to the environment.

Method used

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  • Method for wet desulphurization in CFB boiler

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, a method for wet desulfurization in a CFB boiler furnace

[0029] Take a company's 150MW generator set equipped with a 520t / h CFB boiler as an example. Boiler load 148-158MW, coal-fired calorific value 4800-5200kcal / kg, coal-fired sulfur content 0.3-0.45mg / kg, flue gas SO before desulfurization 2 Original emission value 900 / Nm 3 .

[0030] The wet desulfurization method includes the following steps:

[0031] 1. The desulfurizer uses 100% calcium carbide mud, and the calcium oxide content of the desulfurizer is 55-60%. Water (industrial wastewater) is added to the desulfurizer to prepare a paste-like desulfurizer, and the moisture content of the paste-like desulfurizer is 30-40%. .

[0032] 2. Set the calcium-sulfur ratio according to the calcium content of the desulfurizer and the sulfur content of the coal. Under the control of the DCS system, adjust the frequency of the reciprocating slurry delivery pump (20-30Hz), and the reciprocating slurry delive...

Embodiment 2

[0038] Embodiment 2, a CFB boiler furnace wet desulfurization method

[0039] Take a company's 150MW generator set equipped with a 520t / h CFB boiler as an example. Boiler load 148-158MW, coal-fired calorific value 4800-5200kcal / kg, coal-fired sulfur content 0.35-0.5mg / kg, flue gas SO before desulfurization 2 Original emission value 1000 / Nm 3 .

[0040] The wet desulfurization method includes the following steps:

[0041] 1. The desulfurizer is composed of 50% calcium carbide mud and 50% calcium carbide dust ash, and the calcium oxide content is 47-57%. Water is added to the desulfurizer to prepare a paste-like desulfurizer. The moisture content of the paste-like desulfurizer is 30-40% %.

[0042] 2. Set the calcium-sulfur ratio according to the calcium content of the desulfurizer and the sulfur content of the coal. Under the control of the DCS system, adjust the frequency of the reciprocating slurry delivery pump (20-30Hz), and the reciprocating slurry delivery pump will ...

Embodiment 3

[0048] Embodiment 3, a method for wet desulfurization in a CFB boiler furnace

[0049] Take a company's 150MW generator set equipped with a 520t / h CFB boiler as an example. Boiler load 148-158MW, coal-fired calorific value 4800-5200kcal / kg, coal-fired sulfur content 0.4-0.55mg / kg, flue gas SO before desulfurization 2 Original emission value 1200 / Nm 3 .

[0050] The wet desulfurization method includes the following steps:

[0051] 1. The desulfurizer is composed of 65% calcium carbide mud and 35% calcium carbide dust ash. The content of calcium oxide in the desulfurizer is 48-58%. Water is added to the desulfurizer to make a paste desulfurizer. The moisture content of the paste desulfurizer is 35-40%.

[0052] 2. Set the calcium-sulfur ratio according to the calcium content of the desulfurizer and the sulfur content of the coal. Under the control of the DCS system, adjust the frequency of the reciprocating slurry delivery pump (20-30Hz), and the reciprocating slurry deliver...

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Abstract

The invention discloses a method for wet desulphurization in a CFB boiler, especially relates to a wet desulphurization method suitable inside a CFB boiler of 1000t / h level and below in a 350MW power plant, and belongs to the technical field of environmental protection. According to the method for wet desulphurization in a CFB boiler, industrial waste calcium carbide slurry and / or calcium carbide dedusting ash are / is used as a desulfurizer, and water is added to prepare a paste desulfurizer; through conveying equipment, the paste desulfurizer is injected into the CFB boiler; and combustion inside the CFB boiler is regulated so as to finish the desulphurization process. The invention has characteristics of less investment in equipment, simple operation, high desulphurization efficiency, reliable operation, etc. By the method, secondary pollution of a desulfurizer or desulphurization sewage to the environment can be reduced. The method is a brand-new circulating fluidized bed boiler flue gas desulfurization method, provides a brand-new approach to desulphurization for a circulating fluidized bed boiler of 1000t / h level and below, and has good social and economic benefits.

Description

technical field [0001] The invention relates to a method for wet desulfurization in a CFB boiler in the production process of a thermal power plant, in particular to a method for wet desulfurization in a CFB boiler of a 350MW power plant with a capacity of 1000 t / h and below, and belongs to the technical field of environmental protection . Background technique [0002] Flue gas desulfurization refers to the process of removing sulfur and compounds in flue gas. According to the application characteristics of process water in the flue gas desulfurization process, the currently used desulfurization methods are divided into three categories: wet method, dry method and semi-dry method: [0003] The dry desulfurization method in the limestone furnace is to use high-pressure distribution air to blow limestone particles of different particle sizes and dry scattered states into the boiler furnace, and the (CaCO 3 ) is the absorbent for desulfurization, and the SO in the flue gas 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/502
Inventor 孙宽孙有东孙旭东
Owner 孙宽
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