双效低温浓缩碱液热泵系统的构建与性能模拟分析  

Construction and Performance Simulation Analysis of Heat Pump System for Concentrating NaOH Solution by Dual-effect Hypothermia Evaporation

作　　者：邸云伟 卢迅 杜垲[1] DI Yunwei;LU Xun;DU Kai(School of Energy and Environment,Southeast University,Nanjing,Jiangsu 210096,China;Wuxi Yi Xing Thermal Energy Equipment Co.,Ltd.,Wuxi,Jiangsu 214000,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]无锡市一星热能装备有限公司,江苏无锡214000

出　　处：《制冷技术》2019年第6期21-25,共5页Chinese Journal of Refrigeration Technology

摘　　要：本文在单效低温浓缩碱液热泵系统的基础上,建立一种双效低温浓缩碱液热泵系统。通过模拟计算,研究了碱液浓缩蒸发压力对双效系统性能的影响,并在相同的碱液浓缩环境与目标下,对比了双效系统与单效系统的性能。结果表明:双效系统单位能耗蒸发量(Specific Moisture Extraction Rate,SMER)随着一效碱液浓缩蒸发压力的升高而降低,随着二效碱液浓缩蒸发压力的升高而升高;压缩机压比r随着一效碱液浓缩蒸发压力的升高而升高,随着二效碱液浓缩蒸发压力的升高而降低,且SMER的范围为13.87~19.55,r的范围为2.003~2.541;当一效和二效碱液浓缩蒸发压力分别取7.5 kPa和6.5 kPa,双效系统SMER最高达到19.55;在相同的压力变化范围内,单效系统压缩机压比r在1.7~1.75之间,SMER近似为13.7,均低于双效系统;采用双效技术解决了单效系统中存在的压缩机压比过小的问题,且双效系统SMER高于单效系统,热能得到进一步回收。Based on the present study,a new heat pump system for double-effect hypothermia evaporation concentrating NaOH solution is constructed in this paper.The influence of lye evaporation pressure on the performance of the double-effect system is studied,and the performances of the double-effect system and the single-effect system under the same NaOH concentration environment and target are compared through simulation.The simulation results show that,the specific moisture extraction rate(SMER)of double-effect system is decreased with the increase of the first effect lye evaporation pressure,and is increased with the increase of the second effect lye evaporation pressure;the value ranges from 13.87 to 19.55;the pressure ratio of compressor of double-effect system is increased with the increase of the first effect lye evaporation pressure,and is decreased with the increase of the second effect lye evaporation pressure;the value ranges from 2.003 to 2.541;the SMER of double-effect system gets to the highest value as 19.55 when the concentration evaporation pressure of first and second effect lye was 7.5 kPa and 6.5 kPa;in the same range of pressure change,the SMER of single-effect system maintains around 13.7,and the pressure ratio of compressor in single-effect system is between 1.7 and 1.75,which are lower than those of double-effect system;the double-effect technology solves the problem that the pressure ratio of compressor in the single-effect system is too small,and the SMER of double-effect system is higher than that of the single-effect system,which means the heat energy is further recovered.

关 键 词：热泵 碱液浓缩 双效系统 模拟分析 EES软件 

分 类 号：TQ051.21[化学工程]