Method and equipment for recovering, activating and utilizing carbon dioxide from sugar refinery

Abstract

The invention discloses method and equipment for recovering, activating and utilizing carbon dioxide from a sugar refinery. The method comprises the following steps: introducing low-content carbon dioxide contained in flue gas of a boiler of the sugar refinery into a carbon dioxide adsorption tower, and reacting the carbon dioxide with lime cream inside the carbon dioxide adsorption tower to form a calcium carbonate solution; introducing a part of the calcium carbonate solution into phosphoric acid to generate calcium dihydrogen phosphate and the carbon dioxide, wherein the calcium dihydrogen phosphate is used for squeezing and secondary phosphorus addition; reacting the other part of the other part of the calcium carbonate solution with the carbon dioxide to generate calcium hydrogen carbonate, and pumping to mixed juice preliming, a floating device overflow pipe and a filtered juice quick-sinking reactor by using a calcium hydrogen carbonate pump. The method disclosed by the invention can be used for generating the calcium carbonate by reacting the low-concentration carbon dioxide contained in the flue gas of the boiler with the lime cream and preparing the calcium hydrogen carbonate and the calcium dihydrogen phosphate as clarifying agents used for the sugar refinery by utilizing the calcium carbonate and the phosphoric acid, thereby achieving the purpose of cane juice clarification by removing a part of colloid and non-sugar components in an adsorbing way, enhancing the CO2 utilization rate and reducing the discharge amount of the carbon dioxide from a chimney of the sugar refinery.

Description

technical field [0001] The invention relates to a carbon dioxide recovery and utilization method and equipment, in particular to a sugar factory carbon dioxide recovery, activation and utilization method and equipment. Background technique [0002] The sugar cane sugar production process includes two processes: sulfurous acid method and carbonic acid method. Among them, in the sulfurous acid method, since the colloid, polyphenols, iron ions and other non-sugar impurities in the sugar juice are difficult to remove, the clarification efficiency is relatively low. Carbonated sugar process is low. Therefore, the quality of sugar products produced by the sulfite sugar production process is slightly worse than that of the carbonation sugar production process. [0003] At present, lime and sulfur dioxide are used as clarifiers in the sulfite sugar production process, and the clarification process of cane juice and syrup is completed through steps such as ash addition, sulfur...

AI Technical Summary

Problems solved by technology

However, the current traditional natural filling equipment requires a large investment in equipment, and the utilization rate of carbon dioxide is not high, and the expected clarification effect cannot be achieved.

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