Low-energy-consumption oxygen-enriched combustion system coupling solar energy and chemical loop air separation

Abstract

The invention discloses a low-energy-consumption oxygen-enriched combustion system coupling solar energy and chemical looping air separation. The system comprises a dry steam preparing device, a chemical looping air separation device and an oxygen-enriched combustion device. The dry steam preparing device comprises a solar thermal collector, a steam generator and a distributor. Dry steam generated by the dry steam preparing device is divided into two parts by the distributor, one part of the dry steam enters the chemical looping air separation device to serve as the fluidization gas of an oxygen suction reactor, and the other part of the dry steam enters the oxygen-enriched combustion device. High-purity oxygen generated by the chemical looping air separation device enters the oxygen-enriched combustion device to be mixed with the dry steam and fuel for mixed combustion, and high-purity carbon dioxide is acquired by simply condensing and separating combustion products. The low-energy-consumption oxygen-enriched combustion system has the advantages that the dry steam prepared by solar energy can be used as the fluidization gas of the chemical looping air separation device and can also be fed into the oxygen-enriched combustion device to participate in combustion reaction, smoke recycling loops are reduced, energy consumption of the oxygen-enriched combustion system is lowered, and system efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of oxygen-enriched combustion, and more specifically relates to a low-energy-consumption oxygen-enriched combustion system based on coupled solar energy and chemical chain air separation technology. Background technique [0002] Since the industrial revolution, due to the needs of industrial development, a large amount of fossil fuels have been used, causing the concentration of carbon dioxide in the atmosphere to rise continuously and rapidly, seriously affecting the global environment. Aiming at the global issue of carbon dioxide emission reduction, many countries have proposed their own research plan. Among them, oxygen-enriched combustion technology, as one of the carbon dioxide capture technologies, can rely on the existing traditional coal-fired power plants and has a good development prospect. [0003] Oxygen-enriched combustion technology is a high-efficiency cleaning technology that uses high-conce...

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Problems solved by technology

[0006] The current oxyfuel combustion system using chemical looping air separation technology usually passes the recirculated flue gas into the oxygen release reactor to produce a mixed gas rich in oxygen and carbon dioxide, but this system often requires more external heat to maintain oxygen release The required temperature conditions in the reactor and the oxygen absorbing reactor make the energy consumption of the system high. In addition, because the flue gas passed into the oxygen releasing reactor already contains a certain amount of oxygen, it is easier to achieve the balance of oxygen absorbing and releasing oxygen. The amount of oxygen produced is small, which is difficult to meet the needs of oxygen-enriched combustion; there are also some oxygen-enriched combustion schemes that use chemical looping air separation technology to extract part of the steam from the steam turbine of the oxygen-enriched combustion unit as the fluidized gas of the oxygen release reactor, but this way will significantly reduce the efficiency of the oxyfuel combustion system

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