Improved heat integration coal-fired power plant decarbonization system and method

Abstract

The invention discloses an improved heat integration coal-fired power plant decarbonization system and method, belonging to the technical field of energy conservation and emission reduction. The system mainly consists of two parts, namely a power plant steam turbine power generation unit and a CO2 capturing unit, wherein the two units are communicated through a cooler at the top of an analytic tower, a reboiler and a multi-stage compression cooled heat exchanger. According to the system, the low-pressure cylinder safety performance of the CO2 capture power plant is guaranteed; and meanwhile, due to the integration of the power plant steam turbine power generation unit and the CO2 capturing unit, the steam turbine power generation unit extracts steam and recovers the pressure energy through a small steam turbine, and the heat released by the CO2 capturing unit heats condensate water in the power plant through the cooler at the top of the analytic tower and the multi-stage compression cooled heat exchanger, so that the CO2 capture energy consumption is greatly reduced. According to the integration system, the safety operation of the CO2 capture power plant is guaranteed, the gradient energy utilization is realized, the CO2 emission can be effectively suppressed, the energy consumption of carbon emission reduction is reduced, and high energy utilization efficiency and technical and economic performance are obtained.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to an improved heat-integrated coal-fired power station decarbonization system and a decarbonization method. Specifically, it involves the capture of CO from the boiler exhaust of coal-fired power plants 2 , Carry out energy system integration, effectively suppress CO 2 emissions while maintaining a high level of plant performance. Background technique [0002] In recent years, the greenhouse effect has become the most serious global environmental problem facing mankind. Studies have shown that CO 2 Contributes the most to the greenhouse effect. The power industry is CO 2 Large emitters, for our country, thermal power units still account for more than 75% of the proportion, and the CO emitted by the power industry every year 2 The amount is close to the national CO 2 half of the total emissions. Therefore, the power industry CO 2 Emis...

AI Technical Summary

Problems solved by technology

However, due to the large energy consumption, generally speaking, the CO 2 When captured, the power generation efficiency of the power plant will drop by 10-15 percentage points, and it will also have a serious impact on the normal operation of the low-pressure cylinder of the steam turbine, which will cause a series of engineering and technical problems, thus greatly restricting its large-scale application

At the same time, CO 2 The capture unit will release a large amount of medium and low temperature waste heat to the outside, and this part of heat cannot be used reasonably, which is the cause of CO 2 Capture the main causes of high energy consumption

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