摘要
建立燃气内燃机发电机组+烟气型溴化锂吸收式热泵机组(以下简称溴化锂机组)的微型冷热电联供系统,针对制冷工况,采用实验方法对不同负载下的系统性能指标进行实测计算,分析系统高效运行的负载区间及制约高效运行的因素。天然气耗量随负载的增大而增大,耗气率随负载的增大而减小。燃气内燃机排烟温度随负载的增大先增大,而后基本保持不变(当负载达到30 kW后,燃气内燃机排烟温度保持在540℃左右)。溴化锂机组进口烟气温度比燃气内燃机排烟温度低100℃左右,影响溴化锂机组的高效运行。发电效率随负载的增大而增大,当负载为50 kW时,发电效率达到最大(0.31)。一次能源利用率、烟气余热回收率均随负载的增大先增大,然后基本保持不变。当负载达到35 kW及以上时,一次能源利用率基本保持在58%左右,烟气余热回收率基本保持在20%左右。热电比随负载的增大先快速增长,增至最大后缓慢降低。当负载为30 kW时,热电比最高(1.05)。综合考虑机组性能和评价指标,该微型冷热电联供系统宜工作在负载高于30 kW的工况下。改善烟道保温性能,提高溴化锂机组进口烟气温度,有助于溴化锂机组的高效运行。
A micro combined cooling,heating and power system with gas engine generator unit and flue gas lithium bromide absorption heat pump unit(hereinafter referred to as lithium bromide unit)is established.According to the refrigeration conditions,the performance indexes of the system under different loads are measured and calculated by using experimental method,and the load range of efficient operation of the system and the factors restricting the efficient operation are analyzed.The consumption of natural gas increases with the increase of load,and the rate of gas consumption decreases with the increase of load.The exhaust flue gas temperature of the gas engine first increases with the increase of the load,and then basically remains unchanged(when the load reaches 30 kW,the exhaust flue gas temperature of the gas engine remains at about 540℃).The inlet flue gas temperature of the lithium bromide unit is about 100℃lower than the exhaust flue gas temperature of the gas engine,which affects the efficient operation of the lithium bromide unit.The power generation efficiency increases with the increase of the load.When the load is 50 kW,the power generation efficiency reaches the maximum(0.31).The primary energy utilization rate and the flue gas waste heat recovery rate first increase with the increase of the load,and then basically remain unchanged.When the load reaches 35 kW and above,the primary energy utilization rate is basically maintained at about 58%,and the flue gas waste heat recovery rate is basically maintained at about 20%.The heat-to-electricity ratio first increases rapidly with the increase of the load,and then decreases slowly after increasing to the maximum.When the load is 30 kW,the heat-to-electricity ratio is the highest(1.05).Considering the unit performance and evaluation indicators comprehensively,the micro combined cooling,heating and power system should operate under condition of load higher than 30 kW.Improving the heat preservation performance of the flue and increasing the inlet flue gas temperature of lithium bromide unit will help the efficient operation of the lithium bromide unit.
作者
魏璠
渠颖
李家豪
WEI Fan;QU Ying;LI Jiahao
出处
《煤气与热力》
2021年第6期10-14,I0042,共6页
Gas & Heat
基金
天津市科技计划项目支持(20YDTPJC00860)。
关键词
微型冷热电联供系统
性能指标
负载
实验研究
micro combined cooling,heating and power system
performance index
load
experimental research
