Comprehensive Research On The Utilization Of Heat Pump To Recover The Waste Heat Of Power Plant

Faced with the pressure of energy shortage and environmental pollution,China must persist in promoting energy conservation and emission reduction.The heating unit has the problem that the heating capacity is insufficient and the waste water of the circulating water of the power plant cannot be directly utilized.The lithium bromide absorption heat pump can realize the recovery of the low temperature waste heat of the power plant and expand the heating capacity of the heating unit.Study the overall thermoelectric relationship and thermal economy of heat pump heating system,explore the application of heat pump in the field of waste heat recovery of power plant,and hope to provide reference and suggestion for power plant operation and energy saving transformation.Taking a 300 MW heating unit and a 46.4MW lithium bromide absorption heat pump as the research object,the model of lithium bromide absorption heat pump and steam turbine variable working condition was established,and the thermoelectric relationship curve and thermal economic variation of the heat pump after heat pump were studied.The results show that after two 46.4MW lithium bromide absorption heat pumps are configured,the 300 MW heating unit can increase the heating capacity by 10.85% and the load variable rate of 9%.The minimum generating load of the unit is reduced,which is conducive to the heat supply participating in the peak shaving of the power grid;Exploring the influence of heat pump operating parameters on the thermoelectric relationship curve and thermal economy of the heating system: the circulating residual hot water temperature will have a greater impact on the heating system and the heat network return water temperature will have less impact on the system.During the actual operation,the change of circulating residual hot water temperature should be mainly monitored.After the two heat pumps are configured,the heat consumption is reduced by 29GJ/h,and the entire heating season can save about 2,849.539 tons of coal,totaling about 1,994,700 yuan;the emission reduction of carbon dioxide is 74,658,100 tons,sulfur dioxide is 24.221 tons,and nitrogen oxides are 21.086 tons.It has greater economic and environmental benefits.The residual heat of the power plant flue gas is considerable,and the available residual heat is related to the net flue gas smoke temperature.The lower the smoke temperature,the more waste heat that the power plant flue gas transfers to the desulfurization slurry.The desulfurization slurry can be used as the low-temperature heat source of the lithium bromide absorption heat pump to realize the waste heat utilization of the power plant flue gas.The white smoke deep treatment of the power plant chimney is the same as the flue gas waste heat utilization technology route,and both are cooling and dehumidifying treatment of the power plant flue gas,and both can be carried out simultaneously.Therefore,based on the power plant chimney bleaching technology route,the feasible scheme for power plant flue gas whitening and waste heat utilization can be explored.