Supercritical carbon dioxide boiler system for heating recycled flue gas

A carbon dioxide and recirculation technology, applied in steam boilers, lighting and heating equipment, steam generators, etc., can solve the problems of high boiler exhaust gas temperature, poor cooling capacity, and reduced boiler efficiency, and reduce boiler exhaust gas temperature. Avoid the possibility of overtemperature, reduce the effect of the average heat load

Pending Publication Date: 2021-01-29
SHANGHAI BOILER WORKS
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Problems solved by technology

In addition, due to the evaporation process in the water wall of the steam boiler, the heat transfer coefficient in the tube is relatively high. According to the current research, the heat transfer coefficient in the tube of the heating surface of the supercritical carbon dioxide boiler is usually much smaller than that of the steam boiler. Under the same conditions, the supercritical carbon dioxide The cooling capacity of the heating surface of the boiler furnace is poor, which leads to a further increase in the temperature of the metal tube wall on the heating surface of the supercritical car

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  • Supercritical carbon dioxide boiler system for heating recycled flue gas

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Embodiment

[0027]The supercritical carbon dioxide working medium at the outlet of the heating surface of the supercritical carbon dioxide boiler 1 enters the turbine 2 to do work, and the supercritical carbon dioxide working medium enters the low-pressure side of the high-temperature regenerator 3 and low-temperature regenerator 4 in order to release heat, and then enters the cooling The heat release side of the regenerator 5 continues to cool down, and then enters the compressor 6 to increase the pressure. The low-temperature and high-pressure working fluid enters the high-pressure side of the low-temperature regenerator 4 and absorbs heat. All the way into the split economizer 11 endothermic side to increase the temperature, and then merge with the high-pressure side outlet of the high-temperature regenerator 3, and then enter the inlet of the heating surface of the supercritical carbon dioxide boiler 1 to complete the cycle; the low-temperature regenerator 4 high-pressure side outlet wo...

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Abstract

The invention relates to a supercritical carbon dioxide boiler system for heating recycled flue gas, and belongs to the technical field of boiler equipment. The supercritical carbon dioxide boiler system comprises a supercritical carbon dioxide boiler, a turbine, a high-temperature heat regenerator, a low-temperature heat regenerator, a cooler, a compressor, a recirculation fan, a recirculation flue gas heater, a combustor, an air preheater and a shunt economizer. According to the supercritical carbon dioxide boiler system, supercritical carbon dioxide working media shunted by an outlet in thehigh-pressure side of the low-temperature heat regenerator and boiler recycled flue gas are used for cooling boiler tail flue gas, so that the purposes of reducing the boiler inlet working medium temperature, reducing the temperature level of the flue gas in a hearth, reducing the boiler exhaust gas temperature and improving the working condition of the hearth heating surface are achieved on thepremise of ensuring the boiler efficiency.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide boiler system for heating recirculating flue gas, belonging to the technical field of boiler equipment. Background technique [0002] Compared with the water-steam Rankine cycle, the supercritical carbon dioxide Brayton cycle has the characteristics of full flow reheating and large heat recovery, and the inlet temperature of the boiler is much higher than that of the water-steam Rankine cycle with the same parameters. It also leads to a higher temperature level of the working fluid on the heating surface of the supercritical carbon dioxide boiler furnace. According to data, in a thermal cycle of 25MPa and 600°C, the temperature of the inlet working fluid of the steam boiler is about 300°C, while the temperature of the inlet working fluid of the supercritical carbon dioxide boiler is about 450°C. In addition, due to the evaporation process in the water wall of the steam boiler, the heat transfer c...

Claims

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Application Information

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IPC IPC(8): F22B3/08F22B31/00F22B31/08F22B33/18
CPCF22B3/08F22B31/00F22B31/08F22B33/18
Inventor 闫凯杨涛李月华
Owner SHANGHAI BOILER WORKS
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