Design and analysis of natural working medium printing waste heat recovery high temperature heat pump systems
In view of the production status of a dyeing plant in Zhejiang Province which consumes a lot of heat source steam to produce hot water and has a lot of waste heat of high temperature wastewater,a semi-open high temperature heat pump system using water as circulating working medium,with high efficiency contact condenser and spray twin-screw compressor,is proposed for waste heat recovery and heat feeding of printing and dyeing wastewater.By establishing and solving the thermodynamic model,the performance coefficient(COP)and spe-cific energy consumption(SWC)of the heat pump system are analyzed,and the energy saving and emission re-duction benefits of the system discussed based on the best working conditions.The results show that increasing the evaporation temperature of the heat pump and decreasing the condensation temperature can effectively im-prove the energy efficiency of the system.Under the conditions of 110 ℃ condensation temperature and 80 ℃evaporation temperature,the COP and SWC of the heat pump system can reach 8.38 and 11.6 kW·h·m-3,respectively.It is estimated that the system can reduce the steam consumption by 46.33％,the energy purchase cost by 35.81％,and the carbon dioxide emission by 40.32％.
waste heat recoveryhigh temperature heat pumpdyeing wastewaterenergy conservation and e-mission reduction
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