Method for reducing emission of thermal power generation smoke CO2 and subsidiarily producing superfine nanometer CaCO3 from thermal power generation smoke CO2

A technology of ultra-fine nano and flue gas, which is applied in the direction of nanotechnology, nanotechnology, separation methods, etc., can solve the problems of low treatment costs, achieve low carbon emissions, reduce thermal pollution, and prevent equipment fouling.

Active Publication Date: 2014-08-20
天津海桓科技有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to eliminate the influence of the greenhouse effect produced by flue gas. It is a comprehensive technology for purifying flue gas from thermal power generation. It not only has low treatment costs, but also can generate certain economic benefits. Combination of technologies, thoroughly realize the resource utilization and zero discharge of pollutants, and realize the goal of turning waste into wealth and clean production

Method used

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  • Method for reducing emission of thermal power generation smoke CO2 and subsidiarily producing superfine nanometer CaCO3 from thermal power generation smoke CO2

Examples

Experimental program
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Effect test

Embodiment 1

[0039] at 10m 3 / h seawater on the flue gas decarbonization process of 50kw gas-fired power generation as an example:

[0040] 1) The milk of lime with a concentration of 25% is used as a decarburizing agent to pass into the decarbonization tower 1. The temperature of the flue gas discharged after gas-fired power generation is 100°C, and the volume content of carbon dioxide is 10%. The gas reacts with milk of lime to generate calcium carbonate and calcium bicarbonate through countercurrent washing, and the pH value of the solution after the reaction is 5.5. Excess flue gas (temperature 25°C, carbon dioxide content 1%) is discharged from the top of the decarbonization tower, and the carbon dioxide absorption rate is 90%;

[0041] 2) Calcium carbonate and calcium bicarbonate are settled through the settling tank 2, and the industrial calcium carbonate product is produced after the precipitate is washed, press-filtered and dried, and the mixed solution containing calcium bicarbo...

Embodiment 2

[0048] at 150m 3 / h Seawater decarbonization process of 1000kw coal-fired flue gas (after desulfurization and denitrification) as an example:

[0049] 1) The milk of lime with a concentration of 35% is used as a decarburizing agent to pass into the decarbonization tower 1. After the flue gas after coal-fired power generation is desulfurized and denitrified, the volume content of carbon dioxide is 11.3%. Gas reacts with milk of lime to generate calcium carbonate and calcium bicarbonate through countercurrent washing, and the pH value of the solution after the reaction is 6. Excess flue gas (temperature 24°C, carbon dioxide content 1.1%) is discharged from the top of the decarbonization tower, and the carbon dioxide absorption rate is 90.2%;

[0050] 2) Calcium carbonate and calcium bicarbonate are settled through the settling tank 2, and the industrial calcium carbonate product is produced after the precipitation is washed, press-filtered and dried, and the mixed solution cont...

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Abstract

The invention provides a method for reducing the emission of thermal power generation smoke CO2 and subsidiarily producing superfine nanometer CaCO3 from the thermal power generation smoke CO2. A device for realizing the method comprises a decarburization tower, a settling tank, a water inlet pump I, a reaction tank, a first-level settling tank, a second-level settling tank, a third-level settling tank, an intermediate tank, a water inlet pump II and a ceramic membrane filter which are successively connected through a pipeline, wherein the settling tanks are all connected with a calcium carbonate storing groove. The method provided by the invention has the advantages that smoke discharged from thermal power generation is purified and decarburized, the low carbon emission of the smoke of a power plant is realized, the environment stress of the power plant is relieved, and the green power generation is realized; the temperature of the smoke is reduced through the contact heat transfer of seawater and the smoke, waste heat is fully utilized, and the heat pollution caused by high temperature smoke emission is reduced; the CO2 in the smoke is converted into a CaCO3 product after being absorbed, the waste is turned to wealth, the smoke decarburization and the seawater decarburization are combined, the treating cost spent on the seawater decarburization is reduced, and an equipment scaling problem in the later sea water desalination process is prevented.

Description

technical field [0001] The invention relates to a seawater fixed thermal power generation flue gas (gas-fired power generation flue gas or coal-fired power generation flue gas after desulfurization treatment) CO 2 Production of Ultrafine Nano-CaCO 3 Methods. Specifically, the use of lime milk to absorb CO in the flue gas emitted by thermal power generation 2 At the same time, by-product calcium carbonate and ultra-fine and nano calcium carbonate products, and remove the calcium ions in seawater together, so as to realize the method of green thermal power generation. Background technique [0002] In recent years, with the development of industry, smog weather occurs frequently, seriously affecting the normal social activities and health of human beings, and thermal power generation is one of the important reasons for smog weather. Under the emission standard: the coal-fired power generation unit burns 100,000 tons of coal, the emission of carbon dioxide is about 4,180 tons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/62C02F9/04C01F11/18B82Y30/00B82Y40/00
CPCY02P20/129
Inventor 马敬环赵祈涵
Owner 天津海桓科技有限公司
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