热管型双效溴化锂机组热管换热器的影响因素

Influencing Factors of Heat Pipe Exchanger of Double-effect Lithium-bromide Unit

分析了热管型双效溴化锂吸收式冷热水机组中的分离式热管换热器的工作原理,对影响分离式热管换热器性能的因素进行了研究。在烟气出口温度一定的前提下,较高的烟气进口温度可减少分离式热管换热器的传热面积,降低造价,但受到热管工作温度的限制,应控制烟气进口温度。在热管几何参数不变的情况下,烟气进口温度对分离式热管换热器的传热系数影响很小,因此为提高传热系数,应优化其结构。虽然较低的高压发生器溴化锂溶液进出口温度可减少分离式热管换热器的换热面积,但会使双效溴化锂吸收式冷热水机组的性能系数有所下降。

The operating principle of separated heat pipe exchanger of double-effect lithium-bromide absorption-type water chiller-heater unit is analyzed, and the study on factors influencing the performance of separated heat pipe exchanger is conducted. On the premise of constant outlet temperature of flue gas, the higher inlet temperature of flue gas can reduce the heat transfer area of separated heat pipe exchanger, thus lowering the manufacturing cost, but it is limited by the working temperature of heat pipe, so the inlet temperature of flue gas shall be controlled. Under the condition of constant geometric parameters of heat pipe, the influence of inlet temperature of flue gas on the heat transfer coefficients of separated heat pipe exchanger is small, so the structure of separated heat pipe exchanger shall be optimized to enhance the heat transfer coefficients. Though the lower inlet and outlet temperatures of lithium- bromide solution in high pressure generator can reduce the heat transfer area of separated heat pipe exchanger, the performance coefficients of double-effect lithium-bromide absorption-type water chiller-heater unit will be reduced at the same time.