Research On The Recovery Of The Waste Heat Of Condensation Water In Power Plant

In recent years, the Chinese government has been actively committed to reducinggreenhouse gas emissions and increase energy efficiency. Cogeneration is to be sent tothe task of a technical solution. At present, for the use of cogeneration absorption heatpump into research, our technology is not mature enough, a lot of technology is still inthe exploratory stage. Cogeneration have a great impact to the implementation of energyconservation policies, it can improve energy efficiency and reduce energy waste and isan effective means. In this paper, based on the waste heat recovery power plant projectof Qiqihar City, I explored the use of lithium bromide absorption heat pump technologyto recover waste heat.Qiqihar thermal power plant has four turbines of350MW. Based on the heatingrenovation project of Qiqihar thermal power plant, the temperature of hot water supplynetwork is designed for85℃, backwater is50℃.Then we use the absorption technologyto connect secondary heat exchanger water network, one advantage of the technology isthat it increased the temperature of the return water of network, thus, it reduced flow ofthe heating network water. Then, during the cogeneration transformation, we can usethe existing heating network to transport more heat, and reduce the difficulty ofreconstruction work.The paper designed a new cogeneration heating system, the new system use singleand double lithium bromide absorption heat pump and steam-water heat exchanger torecover waste heat of condensate in the thermal power plant. This program takes fullyadvantage of three characteristics: heat coefficient of the double-effect lithium bromideabsorption heat pump is higher than single-effect lithium bromide absorption heat pump,heating temperature of the single-effect lithium bromide absorption heat pump is higherthan lithium bromide double-effect absorption heat pump and steam-water heatexchanger can improve higher temperature. Three characteristics has the increasing ofthe thermal power plant waste heat recovery theoretically possible.After heat recovery plan was finalized, we need design the temperature of heatingnetwork each device in the system water outlet, in order that heat transfer coefficient isthe maximum of the whole system, this paper calculated the temperatures of each deviceheating network water outlet on the condition of heat pump deflated range, heat balanceand mass balance when heat transfer coefficient is the objective function. Thiscomparison is also calculated as a comparison of two conventional heat recoveryscheme (single-effect lithium bromide and the use of double-effect absorption heatpump respectively) is the best system of heat transfer coefficient of the program in that the heating coefficient advantage.Finally, the article also did some research on the factors of heat transfer coefficientof double effect lithium bromide absorption heat pump and steam-water heat exchangercondensate series operation of the heating system. It proved that the temperature ofwater of the system, the temperature of driving source, the temperature of cooling waterand heat recovery efficient of heat exchanger can affect the heating coefficient,circulation ratio, consumption and cooling water flow of the system.