Heat-supply and carbon-dioxide capturing system and method

Abstract

The invention provides heat-supply and carbon-dioxide capturing system and method, which can effectively utilize a heat source and simultaneously capture carbon dioxide. The system comprises a water-vapor condensing heat exchanger, a gas-liquid separator, a carbon-dioxide storage tank, a carbon-dioxide condensing heat exchanger, a carbon-dioxide absorption tower, a carbon-dioxide absorption-liquid regeneration tower and a chemical-chain combustion reactor, wherein the water-vapor condensing heat exchanger is used for condensing water vapor in the mixed gas of the carbon dioxide and the water vapor; the gas-liquid separator is used for separating the liquid water and the carbon-dioxide gas from the water-vapor condensing heat exchanger; the carbon-dioxide condensing heat exchanger is used for condensing the carbon-dioxide storage tank; the carbon-dioxide absorption tower is used for absorbing the carbon dioxide; the carbon-dioxide absorption-liquid regeneration tower is used for regenerating an absorption enriched liquid; copper oxide and nickel oxide used as oxygen carriers are at least filled in the chemical-chain combustion reactor; the reduction reaction of the oxygen carriers or the regeneration reaction of the oxygen carriers is carried out in the chemical-chain combustion reactor; and the chemical-chain combustion reactor is used for supplying the reaction product of the reduction reaction of the oxygen carriers for the carbon-dioxide absorption tower and supplying regenerated heat for the reboiler of the carbon-dioxide absorption-liquid regeneration tower.

Description

technical field [0001] The invention relates to a carbon dioxide separation and recovery technology in the fields of chemical industry and environmental engineering, in particular to a heat supply and carbon dioxide capture system and method. Background technique [0002] CO 2 The massive emission of greenhouse gases is an important reason for global warming. Therefore, CO 2 The issue of emissions has aroused great concern from the international community. Reducing CO from fossil fuel combustion 2 There are two main ways to discharge emissions: one is to improve energy efficiency, and the other is to capture CO from combustion flue gas. 2 , and use, store or seal up. [0003] in CO 2 In the removal technology, the exhaust gas of thermal power plant boiler is sprayed with ammonia water to absorb CO 2 , not only can reach CO 2 For the purpose of reducing emissions, high-quality fertilizers can also be obtained. However, since ammonium bicarbonate decomposes into ammon...

AI Technical Summary

Problems solved by technology

However, the existing chemical looping combustion technology has not been practically applied so far because it needs to work at a very high working temperature (>1000°C), and the oxygen carrier will sinter and carbon deposit, resulting in a short service life and other problems.

[0007] On the other hand, in the existing fossil fuel combustion heating systems, especially low-pressure steam boilers or hot water boilers, the high-grade combustion heat has not been utilized in a reasonable gradient

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