Reclaiming system for condensation heat of flue gas during pressurized oxy-coal combustion

Abstract

The invention discloses a reclaiming system for condensation heat of flue gas during pressurized oxy-coal combustion, and belongs to the field of energy technology application and CO2 capture. In the technology, by utilizing the characteristic that the condensation temperature of flue gas moisture under high pressure is improved to about 200 DEG C, the condensation heat of the flue gas moisture heats condensation water of a steam turbine, the condensation process is performed in a high-pressure flue gas condenser, the flue gas generated during pressurized oxy-coal combustion enters the high-pressure flue gas condenser, steam in the flue gas is cooled and releases latent heat of vaporization to heat the condensation water of the steam turbine, and the discharged flue gas is continuously compressed and liquefied to fulfill the aim of capturing CO2. Through the technology, the condensation heat of the flue gas moisture is fully utilized, the smoke discharge loss is reduced, the output of the steam turbine is improved, the energy consumption for capturing the CO2 is reduced, and the thermal economy of the pressurized oxygen enriched combustion generating system is improved.

Description

technical field [0001] The invention belongs to energy technology application and CO 2 In the field of capture, it specifically relates to a system for recovering condensation heat of flue gas from combustion of supercharged oxygen-enriched coal, which makes full use of sensible heat and latent heat of flue gas to heat boiler feed water. Background technique [0002] The exhaust gas temperature of traditional pulverized coal fired power plant boilers is about 110-140 ° C. The moisture contained in the coal and the hydrogen element in it are burned to produce water vapor and the moisture carried by the combustion air. The volume share of water vapor in the flue gas is about 10 -15%, the condensation temperature of moisture under normal pressure is 45-55°C, this heat of condensation is not suitable for recycling in the thermal system, it can only be discarded, and at the exhaust gas temperature of about 120°C, the exhaust gas loss is as high as 6-7%, which is normal The large...

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Problems solved by technology

[0002] The exhaust gas temperature of traditional pulverized coal combustion power plant boilers is about 110-140 °C. The moisture contained in coal and the hydrogen elements in it are burned to produce water vapor and the moisture carried by the combustion air. The volume share of water vapor in the flue gas is about 10 -15%, the condensation temperature of moisture under normal pressure is 45-55°C, this heat of condensation is not suitable for recycling in the thermal system, it can only be discarded, and at the exhaust gas temperature of about 120°C, the exhaust gas loss is as high as 6-7%, which is normal The maximum heat loss of the pulverized coal fired boiler

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