Method for absorbing and activating carbon dioxide in boiler flue gas and application of method

A carbon dioxide and boiler flue gas technology, applied in chemical instruments and methods, applications, separation methods, etc., can solve the problems of short residence time of flue gas, full-filled tank foaming, shutdown, etc., to reduce residence time and reduce emissions Quantity, improve the effect of quality

Active Publication Date: 2013-04-03
GUANGXI NANNING HUAXIN SUGAR IND TECH
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  • Abstract
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Problems solved by technology

As a result, the flue gas stays in the full-filled tank for a very short time, and the carbon dioxide absorption rate is abo

Method used

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Example Embodiment

[0022] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0023] The idea of ​​the present invention is: in a two-stage spray filler absorption tower, use alkaline lime milk to absorb carbon dioxide in the flue gas and generate calcium carbonate solution by-products of the decarbonization process; then, the clarifier phosphoric acid and part of the calcium carbonate solution are mixed and reacted to produce Calcium dihydrogen phosphate (which is also an excellent clarifying agent for sugar) and high-concentration carbon dioxide gas, and then inject this carbon dioxide gas into the calcium carbonate solution with a jet, so that the calcium carbonate is dissolved and activated into a calcium bicarbonate solution; Add calcium bicarbonate and calcium dihydrogen phosphate solution to the sugarcane juice that has been pre-ashed with lime milk, so that under the condition of...

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Abstract

The invention discloses a method for absorbing and activating carbon dioxide in boiler flue gas and application of the method. The method comprises the following steps of: 1, replacing cane juice through lime milk with the concentration of 8-15-degree Be for absorbing the carbon dioxide in boiler flue gas and generating by-products of a calcium carbonate solution in the decarbonization process in a two-stage spray packing absorption tower; 2, reacting phosphoric acid and one part of calcium carbonate solution, and generating a monocalcium phosphate solution and high-concentration carbon dioxide gas when the PH is controlled to be less than 3; 3, excessively injecting the high-concentration carbon dioxide gas into the calcium carbonate solution through an ejector, dissolving and activating the calcium carbonate into calcium bicarbonate solution, and controlling the PH to be less than 6; and 4, respectively filling the monocalcium phosphate solution and calcium bicarbonate solution generated in the decarburization and activation processes in the steps 2 and 3 into a storage box for later use. The method has the advantages of reducing the retention time of the cane juice in the carbon absorption process and saving the investment, along with high absorption rate and the like.

Description

technical field [0001] The invention relates to the technical field of boiler flue gas treatment and application, in particular to a method for absorbing and activating carbon dioxide of boiler flue gas and its application. Background technique [0002] Carbon dioxide is used as a clarifying agent for sugarcane juice because carbon dioxide reacts with milk of lime in sugarcane juice to form calcium carbonate, and a large number of new calcium carbonate particles have a large specific surface energy, which can absorb and remove some non-sugar impurities in sugarcane juice . Therefore, it is a large number of new calcium carbonate particles that really play a clarification role (and the other clarifiers sulfur dioxide and phosphoric acid in the sugar factory have similar effects, the purpose is to produce a large number of new calcium sulfite and calcium phosphate particles in the sugarcane juice, so as to adsorb and remove them. Non-sugar impurities in some sugarcane juice)....

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/62C01F11/18C01B25/32C13B20/00C13B20/02C13B20/12C02F1/52
CPCY02P20/152Y02P20/151
Inventor 韦武林何华柱扶雄
Owner GUANGXI NANNING HUAXIN SUGAR IND TECH
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