Study On Solution Evaporation And Concentration System Based On Heat Pump Cycle

Realizing low-cost wastewater evaporation and concentration is the vital problem in zero wastewater discharge.The evaporation and concentration system based on heat pump cycle can evaporate and concentrate the liquid at low temperature and low power consumption,greatly reducing energy consumption and subsequent processing costs.To reduce energy consumption in the evaporation process of tap water,based on the thermodynamic analysis method,thermodynamic calculation of heat pump evaporation and concentration system with R134 a refrigerant was carried out,evaporation unit volume of water as a reference,under a given working condition to meet thermal load and cycle.The efficiency coefficient E is defined as the ratio of the power consumption of electric heating to the system,COP reaches 2.97,the efficiency coefficient reaches2.04.and the key components of the system were selected according to the thermodynamic calculation results.The cycle analysis platform of heat pump evaporation and concentration system was programmed with Visual Basic software to simulate the system performance.The results show that the efficiency coefficient from 1.78 to 2.56,1.96 to 2.23 by increasing evaporation temperature and compressor isentropic efficiency.The efficiency coefficient from 1.83 to 2.25,1.97 to 2.09,1.97 to 2.09 by reducing exhaust pressure,condensing temperature and liquid evaporation temperature.To further explore system performance,a heat pump evaporation and concentration system experiment platform was built.The experimental results show that the experimental and simulation results show the similar trend under same working conditions.The efficiency coefficient from 1.78 to 2.50 by increasing evaporation temperature.The efficiency coefficient from 1.78 to 2.18,1.91 to 2.04,1.93 to 2.03 by reducing exhaust pressure,condensing temperature and liquid evaporation temperature.Due to the mechanical loss and irreversible heat loss in the system,maximum error is8.41%,the average error is 5.25%.The accuracy of the simulation calculation is verified,which provides a basis for rationally selecting system operating parameters and optimizing system performance.Figure 58;Table 3;Reference 55...