Analysis on Feasibility and Economy for Complementary Running of Wind Power and Utilizing Waste Heat of Thermal Power Plant

摘要

Currently,wind power and thermal power is generally incompatible in use.The cooling water of coal-fired power plants sends most of the heat to the external environment,which has caused that its thermal efficiency is low,so if the wind power is used in the efficient use of the heat of cooling water,we can not only effectively improve the efficiency of coal-fired power plant,but also can make a complementary running of wind power and thermal power.Heat pump can absorb heat from the cooling water of low temperature to promote the temperature of thermal source of high temperature,and wind power can provide the driving energy of heat pump.In terms of water source heat pump,the temperature of cooling water completely accords with the requirement of low-temperature heat source and the temperature of heating water can reach about 80.At present there are ℃ two ways to achieve the complementary running: firstly,the heat pump absorb some heat from the cooling water of coal-fired power plan to heat the condensed water from condensate pump to achieve a certain temperature,which can not only reduce the coal consumption,but also can reduce the load of the cooling tower.Doing that can reach the effect of saving energy,because that the COP of heat pump is generally bigger than the reciprocal of thermal efficiency of the coal-fired power plant,causing that the power heat pump consume per unit time is less than the power it's heat produces in theory; In another case,heat pump is used in cogeneration to absorb some heat from the cooling water to improve the temperature of feed water of the clients,which can lower the temperature of conveying water from thermal power plant,then the work of thermal power plant and the lost heat in the conveying process will reduce.Both methods use wind power to provide the energy the heat pump need,and the fan capacity we need can be calculated from the heating capacity of heat pump in work.In this paper,the feasibility and economy of the two kinds of forms will be analyzed in detail.