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Method for catching carbon dioxide in flue gas by active sodium carbonate and apparatus thereof

A carbon dioxide and sodium carbonate technology, applied in chemical instruments and methods, carbon compounds, separation methods, etc., can solve the problem of high energy consumption for regeneration, and achieve the effects of low energy consumption for regeneration, cost reduction, and comprehensive treatment.

Inactive Publication Date: 2011-04-06
WUHAN KAIDI ELECTRIC POWER CO LTD
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Problems solved by technology

The method and its equipment can fully adapt to the above-mentioned characteristics of the flue gas at the tail of the power plant boiler, overcome the defects of organic amine oxidation degradation, serious equipment corrosion, and high regeneration energy consumption, and produce high-purity liquid carbon dioxide at low cost and high efficiency

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  • Method for catching carbon dioxide in flue gas by active sodium carbonate and apparatus thereof
  • Method for catching carbon dioxide in flue gas by active sodium carbonate and apparatus thereof

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment equipment of the present invention and technological process are described in further detail:

[0039] The equipment for capturing carbon dioxide in the flue gas of a power station by activated sodium carbonate shown in the figure is mainly composed of an absorption tower 1, a regeneration tower 10, a cooler 17, a gas-liquid separator 16, a dryer 15, a compressor 14 and Condenser 13 etc. are formed. Between the lower flue gas inlet 5 and the top flue gas outlet 22 of the absorption tower 1, three sets of absorbent spray layers 20 and one set of demisting devices 21 are sequentially arranged from bottom to top. Wherein the bottom of the uppermost group of absorbent spray layers 20 is provided with a layer of packing layer 3, and the bottoms of the other two groups of absorbent spray layers 20 are respectively provided with a flow equalizing sieve plate 4, and the hole area of ​​the flow equalizing sie...

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Abstract

The invention relates to a method for catching carbon dioxide in flue gas by active sodium carbonate and an apparatus thereof. The method comprises the following steps of: firstly, combining alkylol amine and CO2 into a zwitterions intermediate product with an alkylol amine activator-added sodium carbonate water solution as a CO2 absorbent; then carrying out hydration reaction to dissociate again for recycling; neutralizing H<+> generated in the hydration reaction with an alkaline ion CO3<2->; and combining HCO3<-> generated in the hydration reaction and the metallic ion Na<+> to separate gradually to finally obtain a sodium bicarbonate slurry. The sodium bicarbonate slurry is subjected to resolving and regeneration to obtain CO2 gas and a sodium carbonate solution. The CO2 gas is prepared into a liquid state through conventional treatment. The apparatus mainly comprises an absorbing tower, a tilted plate sedimentation tank, a regenerating tower, a cooler, a gas-liquid separator, a dryer, a compressor, a condenser, and the like which are connected through pipelines. The invention has the characteristics of simple process flow and apparatus combination, low investment and running cost and capability of being suitable for large flow rate and low concentration of the flue gas of the tail part of a power station boiler; and the expensive alkylol amine is replaced to prepare the liquid carbon dioxide with high purity.

Description

technical field [0001] The invention relates to the carbon dioxide emission reduction and resource utilization technology in power plant boiler flue gas, in particular to a method and equipment for capturing carbon dioxide in flue gas by activated sodium carbonate. Background technique [0002] Atmospheric greenhouse effect is one of the most important environmental problems facing mankind today. Among all greenhouse gases, CO 2 With high content in the atmosphere and long life, it contributes the most to the greenhouse effect, so CO 2 Emission reduction is an inevitable requirement for sustainable development. According to statistics, by the end of 2007 my country's CO 2 The emissions are 6.01 billion tons / year, ranking first in the world, of which 1623 strong emission sources (single-source emissions of CO 2 1 million tons / year or more) CO emissions 2 up to 3.9 billion tons / year, accounting for all CO 2 About 65% of emissions. Coal-fired power stations account for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/62C01B32/50
CPCB01D53/62Y02C10/04Y02C10/06B01D2252/602B01D2257/504B01D53/1493B01D2251/304B01D53/78B01D2252/20478B01D2258/0283B01D53/1475Y02C20/40B01D53/14
Inventor 魏世发韩旭薛永杰王志龙张岩丰
Owner WUHAN KAIDI ELECTRIC POWER CO LTD
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