资源描述:
《20KW制冷量直燃式氨吸收式制冷机组发生器设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、20KW制冷量直燃式氨吸收式制冷机组发生器设计[摘要]本课题主要是20KW制冷量直燃式氨吸收式制冷机组发生器设计,该装置的工作介质包括制取冷量的制冷剂和吸收、解析制冷剂的吸收剂,二者组成工质对。浓氨水溶液在发生器中被加热,分离出一定流量的冷剂蒸汽进入冷凝器中,冷剂蒸气在冷凝器中被冷却,并凝结成液态;液态冷剂经过节流降压,进入蒸发器,在蒸发器内吸热蒸发,产生冷效应,冷剂由液态变为气态,再进入吸收器中;另外,从发生器流出的稀溶液经换热器和节流降压后进入吸收器,吸收来自蒸发器的冷剂蒸气,吸收过程产生的浓溶液由循环泵加压,经换热器吸热升温后,重新进入发生器,如此循环制冷。发生器是用
2、来使氨水浓溶液沸腾的设备,在氨吸收制冷装置中,发生器是高压、热设备热媒主要是蒸汽或是废热蒸汽,有些情况下也可以采用高温气体或燃烧气体加热。[关键字]氨吸收式制冷,制冷机组,氨水,氨水发生器20KWCoolingCapacityDirect-firedAbsorptionChillerAmmoniaGeneratorDesignAbstract:Themainsubjectis20KWcoolingcapacitydirect-firedabsorptionchillerammoniageneratordesign,thedeviceincludingthepreparati
3、onofworkingmediumcoolingcapacityoftherefrigerantandabsorption,parsingrefrigerantabsorbentcompositionoftheworkingfluidbetweenthetwopairs.Concentratedaqueousammoniasolutionisheatedinthegenerator,mustbeseparatedrefrigerantvaporflowsintothecondenser,therefrigerantvaporinthecondenseriscooledand
4、condensedintoliquid;liquidrefrigerantthroughthrottling,theevaporator,evaporateintheevaporator,resultingincoolingeffect,therefrigerantfromliquidtogas,thenintotheabsorber;further,outofthedilutesolutionfromthegeneratorviatheheatexchangerandthethrottlingintotheabsorber,absorbingtherefrigerantf
5、romtheevaporatorvaporproducedduringabsorptionofaconcentratedsolutionbythecirculatingpumppressure,thetemperatureaftertheheatexchanger,re-enteringthegenerator,andsooncooling.Generatorconcentratedaqueousammoniasolutionisusedtoenablethedeviceboilingintheammoniaabsorptionrefrigerationapparatus,
6、thegeneratorisahighpressure,hotdevicethermalsteamorheatmediumismainlysteam,mayalsobeusedinsomecaseshightemperaturecombustiongasorheatinggas.Keywords:Ammoniaabsorptionrefrigeration,refrigerationunits,ammonia,ammoniagenerator目录1绪论21.1选题的目的21.2研究意义21.3研究现状31.4发展趋势31.5研究方法31.6应用领域42氨吸收制冷机组的工作原
7、理52.1氨吸收制冷技术52.1.1原理52.2单级氨水式制冷剂流程62.3氨水吸收式制冷机工作循环的热力循环83氨吸收式制冷机组的热力循环103.1单级氨水吸收式制冷循环的热力计算103.2蒸发器单位制冷量103.3冷凝器单位热负荷103.4发生段单位热负荷103.5吸收器单位热负荷103.6溶液热交换器热负荷113.7分凝器单位热负荷113.8过冷器单位热负荷123.9循环系统的热平衡关系123.10循环的热力系数124发生器的结构设计4.1发生器形式124.1.1单向流动式或称一次通过式发生器图13II4.1