目前工业生产和民用供热系统中使用着大量蒸汽减压减温器,把热源供应的蒸汽压力温度降低,以满足用热设备的要求。减压减温器从热力学第一定律的观点看没有能量损失,输出的热量和输入的热量相等。但是,从热力学第二定律的观点看,减压减温器产生很大的不可逆损失,蒸汽作功能力大大下降,也就是蒸汽的(火用)值降低,如果想办法把损失的这部分可用能加以利用,可以产生可观的节能效果。按照这种想法,已有人用背压式透平代替减压减温器。用背压式透平代替减压减温器只适用于流量较大、用汽量比较稳定的情况,而对用汽量较小或者用汽量变化较大时,用背压式透平是不适合的。为了回收这部分能量,设想用热泵式减压减温器(或称蒸汽喷射式热泵)。蒸汽喷射式热泵是 At present, a large number of steam decompression desuperheaters are used in industrial production and civil heating systems to reduce the temperature of the steam pressure supplied by the heat source to meet the requirements of the thermal equipment. Decompression desuperheaters from the first law of thermodynamics point of view there is no energy loss, the output of heat and heat input equal. However, from the point of view of the second law of thermodynamics, the decompression desuperheater has a great irreversible loss, and the steam work ability greatly decreases, that is, the exergy value of the steam is reduced. If we try to make this part of the loss available Can be used to produce considerable energy savings. According to this idea, someone has replaced the decompression desuperheater with a back pressure turbine. Use back pressure turbine instead of decompression desuperheater only applies to larger flow, the amount of gas used in the more stable situation, and the use of smaller amount of steam or steam volume changes, with a back pressure turbine is not suitable. In order to recover this part of the energy, imagine the use of heat pump decompression desuperheater (also known as steam jet heat pump). Steam jet heat pump is