Coal combustion CO2 capturing method and device based on metal oxide-CaCO3 absorbent

An oxide, CO2 technology, applied in chemical instruments and methods, carbon compounds, separation methods, etc., can solve the problems of reduced absorption capacity, low volume share, reduced CaO conversion degree, etc., to achieve low price, avoid absorption capacity, achieve The effect of system energy balance

Inactive Publication Date: 2011-10-26
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

However, when coal is directly combusted with air, a large amount of flue gas at the end of coal combustion is produced, due to the inert N in the air 2 The doping dilution, the CO in the tail flue gas 2 The volume share is relatively low, no more than 20%, too low CO 2 The degree of conversion of CaO is greatly reduced due to the gas share; and during the repeated limestone calcination and CaO carbonation reaction, as the number of cycle reactions increases, the reactivity of CaO decays rapidly, and the CO 2 Absorptive capacity keeps decreasing

Method used

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  • Coal combustion CO2 capturing method and device based on metal oxide-CaCO3 absorbent
  • Coal combustion CO2 capturing method and device based on metal oxide-CaCO3 absorbent
  • Coal combustion CO2 capturing method and device based on metal oxide-CaCO3 absorbent

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Embodiment Construction

[0040] The pulverized coal combustion CO proposed by the present invention 2 capture devices such as figure 1 As shown, the two-stage bubbling fluidized bed 1, coal ash separator 2, CaCO 3 The separator 3, the third cyclone separator 10 and the coal fly ash trap 11 form the fuel reactor system A; the fast fluidized bed 4, the first cyclone separator 5 and the first sealing valve 6 form the air reactor system B; Finally, the calciner system C is composed of the fast fluidized bed 7, the second cyclone separator 8, and the second sealing valve 9 connected in sequence.

[0041] The present invention uses carbon-containing fuels such as coal and CuO-limestone composite carrier as raw materials to carry out a series of reactions to complete the full combustion of coal and high-concentration CO 2 The capture process is as follows figure 2 As shown, the specific implementation is as follows:

[0042] 1. First, in the lower half of the fuel reactor 1, the reaction temperature is ...

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Abstract

The invention provides a coal combustion CO2 capturing method and a device based on a metal oxide-CaCO3 absorbent. The method provided by the invention is performed by firstly reacting a metal oxide and coal powder to generate high-concentration CO2 and using CaCO3 calcination product namely CaO as the CO2 absorbent. The method not only promotes the sufficient conversion of coal, but also realizes online activation of CaO by the reaction of CaO and steam, and maintains the stable absorption capacity of CaO to CO2 during multi-time circular reactions.

Description

technical field [0001] The invention relates to the field of coal combustion, especially CO in the process of coal combustion 2 capture methods and devices. Background technique [0002] Control and reduce CO in coal combustion process 2 emissions play an important role in addressing global warming and the greenhouse effect. Especially for China, given its energy structure dominated by coal, CO 2 With the rapid increase in emission levels and already ranking first in the world, my country is currently facing CO 2 Growing pressure to reduce emissions, develop efficient coal-fired CO 2 Separation technology to achieve CO 2 The emission reduction target has great social significance and economic value. [0003] Coal-fired CO 2 The core of emission reduction is to recover high-concentration CO 2 . In various coal-fired CO 2 In emission reduction technology, limestone is used as CO 2 The main advantage of the absorption method of absorbent is that it has certain techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/20B01D53/81B01D53/62C01B32/50
CPCB01D2251/404B01D2257/504Y02A50/20Y02C20/40Y02P20/151
Inventor 王保文高传昌王为术
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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