System for capturing carbon dioxide through power plant flue gas waste heat power generation and control method

Abstract

The invention discloses a system for capturing carbon dioxide through power plant flue gas waste heat power generation and a control method, and belongs to the technical field of flue gas waste heat utilization and carbon dioxide capturing. The system comprises a power generation system, a carbon dioxide compression separation system and a flue gas waste heat cascade recovery system. The power generation system comprises a combined type heat exchanger, an expander, an ORC generator, a cooler, a working medium pump, a thermoelectric power generation chip low temperature side, a thermoelectric power generation chip high temperature side, a thermoelectric power generation chip, a thermistor, a thermoelectric power generation switch, a thermoelectric power generation group, a DC / AC inverter, an ORC generator connection compression separator switch, a thermoelectric power generation group connection supply user switch, an ORC generator connection supply user switch, an ORC generator and thermoelectric power generation group power supply power grid switching switch, a grid-compression separator switch and a thermoelectric power generation chip high temperature side adjusting valve outletcheck valve. The waste heat recovery rate and power generation efficiency are improved, carbon dioxide capturing efficiency is improved, and energy saving and emission reduction effects are achieved.

Description

technical field [0001] The invention belongs to the technical fields of flue gas waste heat utilization and carbon dioxide capture, and in particular relates to a system and a control method for using flue gas waste heat organic Rankine cycle power generation system ORC and flue gas waste heat thermoelectric power generation system for flue gas carbon dioxide capture and separation. Background technique [0002] Efficient use of flue gas waste heat and reduction of greenhouse gas emissions are effective means to deal with atmospheric smog. Heat loss from flue gas exhaust is the main heat loss of boilers in thermal power plants, but there are generally major problems such as low utilization efficiency of waste heat from flue gas and large carbon dioxide emissions. The exhaust gas temperature of power plant flue gas is generally 110-170 ℃, the more the exhaust gas temperature deviates from the design value of the exhaust gas temperature, the lower the boiler efficiency and the...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of serious loss of waste heat of flue gas in existing power plants, reduction of greenhouse gas emissions or near-zero emissions

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