Coupling boiler applied to supercritical carbon dioxide and thermoelectric power generation

Abstract

The invention provides a coupling boiler applied to supercritical carbon dioxide and thermoelectric power generation. After desulfurization and denitrification treatment and tail gas emission, a large amount of heat loss and carbon emission are caused, and energy waste and greenhouse effect are caused. The boiler comprises a supercritical carbon dioxide boiler (13), a steam turbine (4), a pulverized coal boiler horizontal flue outlet (1) and a heat exchange temperature rising pipe (6), wherein a horizontal flue of the supercritical carbon dioxide boiler is in communication with the steam turbine and a CO gas pipeline (10), the steam turbine is in communication with the heat exchange temperature rising pipe, high-temperature tail gas of the pulverized coal boiler horizontal flue outlet and high-temperature tail gas of a flue reduction section of the horizontal flue are in bridge connection to low-temperature tail gas passing through the steam turbine by means of a temperature difference power generation sheet set (5), and the heat exchange temperature rising pipe is connected to a CO2 air cooling wall (2) of the supercritical carbon dioxide boiler by means of a pressure regulating valve (8). The coupling boiler is applied to supercritical carbon dioxide and thermoelectric power generation.

Description

technical field [0001] The invention relates to a coupled boiler applied to supercritical carbon dioxide and thermoelectric power generation. Background technique [0002] Conventional pulverized coal boilers burn pulverized coal to obtain supercritical water. The critical pressure and temperature of supercritical water must reach 22.1MPa and above 374°C. At the same time, taking a 660MW boiler as an example, the exhaust heat loss is due to the fact that the exhaust gas temperature is higher than the air temperature (base temperature) entering the boiler, and this part of the heat is not used. The exhaust heat loss is the boiler efficiency The largest item in the loss accounts for about 4% to 12% of the total heat loss. The flue gas at the end of pulverized coal combustion has a temperature of up to 160°C and the main component of the flue gas is O 2 , CO 2 , SO 2 , NO 2 , water vapor, etc., and also contain a small amount of CO, SO 3 、H 2 、CH 4 and other hydrocarbon...

AI Technical Summary

Problems solved by technology

The flue gas at the end of pulverized coal combustion has a temperature of up to 160°C and the main component of the flue gas is O 2 , CO 2 , SO 2 , NO 2 , water vapor, etc., and also contain a small amount of CO, SO 3 、H 2 、CH 4 and other hydrocarbons (CnHm), after desulfurization and denitrification treatment, the tail gas composition is about 15%O 2 +80%CO 2 +5% other gases, after the exhaust gas is discharged, it will cause a lot of heat loss and carbon emissions, resulting in energy waste and greenhouse effect

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