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A method for capturing SO2 and CO2 in the flue gas of a coal-fired power plant and producing chemical products

A coal-fired power plant, CO2 technology, applied in the field of flue gas purification, can solve problems such as inapplicable power plant flue gas recovery, inability to recycle resources, and ineffective combination of power plant environmental protection and chemical production, achieving good application prospects and reducing The effect of energy consumption and investment saving

Inactive Publication Date: 2016-01-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In terms of chemical production, there was Hou's soda production method in the early days, but Hou's method used high concentrations of CO 2 Industrial gas production, there is a pair of escaping CO in the process 2 recovery and reuse, but it is not suitable for complete power plant flue gas recovery; Chinese patent CN85102466, a new combined soda production method for continuous production of soda ash and ammonium chloride, is a new process technology belonging to the combined soda production method, using carbonic acid Ammonium hydrogen and salt are used as raw materials, and an intermediate salt is added to the reaction solution to promote the separation of heavy alkali and ammonium chloride under normal temperature and pressure conditions. This patent is only applicable to chemical plants and requires high CO 2
[0006] It can be seen that the existing power plant environmental protection and chemical production cannot be effectively combined, and resource recycling cannot be truly realized.

Method used

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  • A method for capturing SO2 and CO2 in the flue gas of a coal-fired power plant and producing chemical products
  • A method for capturing SO2 and CO2 in the flue gas of a coal-fired power plant and producing chemical products
  • A method for capturing SO2 and CO2 in the flue gas of a coal-fired power plant and producing chemical products

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Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1 Aiming at a newly built factory, desulfurization and decarburization are carried out using the ammonia method.

[0064] The process flow of embodiment 1 sees image 3 , the specific process is implemented as follows:

[0065] The flue gas 1 after denitration and dust removal enters the pre-washing tower 2, and the desulfurization ammonia absorption liquid in the pre-washing tower 2 is in countercurrent contact with the flue gas 1 after denitrification and dust removal in the form of spraying, and the desulfurization ammonia absorption liquid is washed and evaporated to obtain a high-concentration desulfurization mother liquid Ⅱ The desulfurization mother liquor II8 enters the hydrocyclone 40, and the crystal-containing high-concentration solution separated in the hydrocyclone 40 enters the centrifugal separator 41, and the liquid-containing solid separated by the centrifugal separator 41 enters the filter I42, and the filter I42 separates The solid is the ...

Embodiment 2

[0066] Embodiment 2 is for the process setting of the system that has already installed denitrification, dust removal and desulfurization devices.

[0067] The flow chart of embodiment 2 sees Figure 5 , the specific process is implemented as follows:

[0068]The flue gas 51 after denitrification, dust removal and desulfurization enters the decarburization tower 52, and the decarburization ammonia absorption liquid in the decarbonization tower 52 contacts with the flue gas countercurrently in a spray mode, and part of the decarburization ammonia absorption liquid that has been contacted in the decarbonization tower 52 is extracted as The decarburization mother liquor 24, the other part is sent to the decarburization section circulation and liquid addition equipment 19 as the decarburization ammonia absorption liquid to continue to circulate, and at the same time, the ammonia water storage tank 17 supplies ammonia water to the decarbonization section circulation and liquid addi...

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Abstract

A Method for collecting SO2 and CO2 in flue gas from coal-fired power plant and producing chemical products, comprises the process of desulfurization and decarbonization by taking ammonia as an absorbent and the process of producing soda ash and other chemical products by taking sodium chloride as a crystals forming agent, in particular includes a step of desulfurization process, a step of decarbonization process,a step of exhaust treatment; a step of sulfur by-product recovery, a step of carbon by-product recovery and a step of CO2 desorption. The invention realizes the removal of SO2 and emission reduction of CO2 from coal-fired power plant, effectively solves emission problems of environmental pollutants in coal-fired power plant, changes the traditional model of producing low value by-product, provides a recycling method to extend the power generation industry chain and the process routes of producing bulk chemicals from desulfurization and decarbonization by-product, having a good application prospect.

Description

technical field [0001] The invention relates to a method for capturing flue gas and producing chemical products, in particular to a method for capturing SO in the flue gas of a coal-fired power plant. 2 and CO 2 And the method for producing chemical products belongs to the technical field of flue gas purification. Background technique [0002] A survey of relevant literature found that the existing research only focuses on the environmental protection side of carbon emission reduction and the chemical side of ammonium bicarbonate or soda ash production, and there are no relevant research and application examples combining the two. The power plant only converts the CO 2 Capture and storage, ineffective use of CO 2 , This leads to high cost of carbon capture. The high operating costs faced by several domestic carbon capture demonstration projects have proved that it is very difficult to take the road of "carbon capture + storage" at this stage economically. In fact, CO 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/75B01D53/50B01D53/62C01C1/24C01D7/00
CPCY02C20/40Y02P20/151
Inventor 马双忱臧斌陈公达宋卉卉刘席洋郭蒙
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)