烟气热水型溴化锂吸收式制冷机组的仿真及性能分析

Simulation and Performance Analysis of Gas and Hot Water Type LiBr-H2O Absorption Refrigeration

基于某烟气热水型溴化锂吸收式制冷机组的工作原理及内部系统流程,建立相应的仿真模型,通过系统热力过程计算,分析热水负荷、溴化锂溶液放气范围、机组负荷率及冷却水温度等因素对机组性能的影响。研究表明:烟气热水型溴化锂机组处于低负荷工况下,优先利用烟气余热,制冷系数可提高16.7%,冷却水流量可减少22.5%;增大溴化锂溶液放气范围,可提高制冷系数,其中放气范围在0.05~0.08之间,COP增长较快,溴化锂溶液浓度差每增长0.01,可增加约3%的制冷量,增大放气范围时,稀溶液浓度的降低受限于冷却水温度;冷却水温度降低,可提高制冷系数,当冷却水进口温度降低,可降低吸收温度,吸收压力降低,蒸发温度降低;发生器满负荷工况下,制冷系数最高;发生器负荷率降低,制冷系数明显降低,发生器负荷率为50%时,制冷量负荷只有30%左右。

A gas and hot water type LiBr-H2O absorption refrigeration was simulated and analyzed.The effects of the hot water load,lithium bromide solution discharge range,generator load rate and cooling water temperature on performance of the unit were studied by simulating the thermodynamic process.Calculation results showed that if the gas and hot water type LiBr-H2O absorption refrigeration use gas first under low load operation,the coefficient of performance(COP) would increase by 16.7%,and the cooling water flow would reduce by 22.5%.Increasing the exhaust range of lithium bromide solution can improve the COP.The COP increases rapidly when the exhaust range between 0.05 and 0.08.Whenever the exhaust range is increased by 0.01,the refrigerating capacity is increased by about 3%.When the temperature of cooling water decreases,the absorption temperature,absorption pressure and evaporation temperature will be reduced,while the COP will be increased.The lower the generator load rate,the lower the coefficient of performance.