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Method for ammonia-process capture of carbon in flue gas and synthesis of chemical products

A chemical product and carbon capture technology, applied in the field of flue gas purification, can solve the problems that cannot be directly and effectively used, and achieve the effect of reducing carbon emissions, reducing emission values, and increasing production

Inactive Publication Date: 2015-06-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above technology, although the use of CO 2 As a raw material for production, but for CO 2 Purity requirements are relatively high. For example, the synthesis process of urea and the synthesis process of carbonate require the use of purified and concentrated CO 2 , while the low-concentration CO emitted by thermal power plants 2 cannot be used directly

Method used

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  • Method for ammonia-process capture of carbon in flue gas and synthesis of chemical products
  • Method for ammonia-process capture of carbon in flue gas and synthesis of chemical products
  • Method for ammonia-process capture of carbon in flue gas and synthesis of chemical products

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Effect test

Embodiment 1

[0053] like figure 2 As shown, the flue gas generated by the power plant goes through processes such as dust removal and desulfurization, and all the flue gas enters the bottom of the absorption tower 3 . Liquid ammonia enters into dilution tank 2 from ammonia water tank 1 and is diluted into 10% ammonia water. The ammonia water is pre-added into absorption tower 3 to react with the flue gas entering from the bottom. Ammonia water passes through absorption liquid circulation pipeline 12 to the spraying device, and the ammonia water is sprayed to further Decarbonize the escaping flue gas. When the pH of the absorption liquid drops to 9.3, the ammonia water tank 1 is opened to add ammonia to the absorption tower 3, and when the pH is close to 12, the ammonia water tank 1 is closed to stop adding ammonia. Monitor the pH value in the absorption tower and maintain the pH in the absorption liquid within the range of 9.3-11.5 by adjusting the amount of ammonia added. Until the rea...

Embodiment 2

[0055] like figure 1 As shown, the concentrated ammonia water enters the dilution tank 2 from the ammonia water tank 1 and is diluted into 15% ammonia water, and the ammonia water is pre-added in the absorption tower 3, and the flue gas passes through operations such as dedusting, desulfurization, and 70% of the flue gas enters the side wall of the absorption tower 3, The position where the flue gas is introduced is above the liquid level. The ammonia water passes through the absorption liquid circulation pipeline 12 to the spraying device, and the carbon dioxide in the flue gas is removed by the reverse convection of the ammonia water and the flue gas by spraying. The decarbonization efficiency of the absorption tower is 82%. When the pH of the absorption liquid drops to 9.3, the ammonia water tank 1 is opened to add ammonia to the absorption tower 3, and the pH reaches 11.5, and the ammonia water tank 1 is closed to stop adding ammonia. Monitor the pH value in the absorptio...

Embodiment 3

[0059] The reaction in the carbonization tower was simulated under the experimental conditions. The carbonization tower contained 1 L of ammonium carbonate solution with a concentration of 7.25 mol / L. The solution contained ammonia water with a concentration of 2%, and sodium sulfate particles were added to the solution until the solution was saturated. Pass into the flue gas, in which the liquid-gas ratio (L / G) is 0.40, in which the CO 2 The partial pressure is 45KPa. The spray amount of the intermediate mother liquor was 3L / min. The pH of the carbonization mother liquor was in the range of 8.5-9.5, and the reaction temperature was 40°C. Continuous production is carried out to obtain the product sodium bicarbonate. The final conversion rate of carbon is 34.23% (the conversion rate of carbon is the ratio of the product to the carbon content of the flue gas entering the tower), of which CO 2 The absorption efficiency is about 26%.

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Abstract

The invention provides a method for ammonia-process capture of carbon in flue gas and synthesis of chemical products. The method is implemented in a flue gas absorption and synthesis apparatus. The flue gas absorption and synthesis apparatus comprises a flue gas pipeline, an absorbing tower and a carbonization tower which are in parallel connection, an ammonia removing tower and a solid-liquid separating unit. The method comprises the following steps: absorption and removal of CO2; carbonization for output of sodium bicarbonate; washing of flue gas for recovery of ammonia; solid-liquid separation; etc. According to the method, the absorbing tower and the carbonization tower are parallely connected to shunt flue gas at the same time, ammonia water is used as an absorbent to capture CO2 in the flue gas, and sodium sulfate is used as a conversion medium to produce chemical products like sodium carbonate and sodium bicarbonate. With the method, product crystallization and carbon dioxide absorption are carried out at the same time; the carbonization degree of mother liquor is increased while carbon emission is further reduced; and decarburization efficiency and product yield are improved. Industrial application of the method can be realized.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a process for removing carbon dioxide from flue gas. Background technique [0002] In recent years, with the frequent occurrence of global warming and extreme weather, the international community is proposing to reduce the greenhouse gas CO 2 At the same time, it is also aware that it is also an inexhaustible and cheap resource, so carbon capture, utilization and storage technology (CCUS) has become the focus of both scientific and industrial circles. This technology uses CO 2 Synthesize basic chemicals, fuels and polymer materials, effectively reduce carbon emissions, and help human beings get rid of the triple dilemma of energy, resources and environment caused by excessive use of fossil energy. Coal-based thermal power plants (CO 2 largest emission source) to achieve cleaner production and CO 2 The effective use of it is the key to achieving sustainable devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/79C01D7/00
CPCY02C20/40Y02P20/151
Inventor 马双忱郭蒙陈公达韩停停别璇何德瑞黄凯
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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