单效溴化锂吸收式换热机组研发与性能实验研究
发布时间：2019-01-23 20:37
【摘要】：溴化锂吸收式换热机组是一种新型的大温差换热系统,区别于传统的板式换热机组,它巧妙的将传统的板式换热机组与溴化锂吸收式热泵集成为新系统。将吸收式热泵原理应用于换热站实现换热机组局部由低温向高温的传热,增大一次水侧的传热温差,从而实现一次水流量不变的情况下增大换热站总传热量的目的。机组着力于解决既有城市热网输送能力不足、供热增容、管网系统水力失衡等原因造成的部分换热站供热能力不足的问题。采用吸收式换热机组,可以大幅度提高热力管网的输送能力,降低管网建设投资费用,节约系统运行成本。论文针对单效溴化锂吸收式换热机组进行研发与性能实验研究。(1)深入分析并建立了溴化锂吸收式换热机组数学模型,包括溴化锂溶液的热物性与状态方程考证与筛选,并据此分别建立吸收式换热机组热力状态模型、吸收式换热机组传热模型以及水力与结构方程,并进行了方程组关联性分析。(2)在吸收式换热机组数学模型方程组的基础上,进行参数与自由度分析,指出设计计算与模拟计算的本质区别和各自特点,提出逆向校核的设计方法和基于拟牛顿法的模拟迭代算法。设计了实验用吸收式换热机组样机,并对其运行特性进行模拟分析。(3)为了对吸收式换热机组的性能和运行特性进行测试,完成了400k W换热量的实验台设计与建设,该实验台可完成换热、制热、制冷实验,以及不同串并联形式和工况条件的实验,选择并设置了合适的仪表和数据采集系统,并对实验安排和步骤进行了详细的设计。(4)在实验台上进行吸收式换热机组的性能试验,主要包括设计工况、变流量、变水温、不凝性气体等多组实验,并对机组冷剂水污染情况进行分析。实验结果表明吸收式换热机组换热效果良好,论文所提出的设计和模拟方法正确可行。论文可为吸收式换热机组的设计与运行提供理论和数据参考。
[Abstract]:Lithium bromide absorption heat exchanger is a new type of large temperature difference heat transfer system, which is different from the traditional plate heat exchanger. It cleverly integrates the traditional plate heat exchanger and the lithium bromide absorption heat pump into a new system. The principle of absorption heat pump is applied to the heat transfer station to realize the local heat transfer from low temperature to high temperature of the heat exchanger unit, and to increase the heat transfer temperature difference of the primary water side, thus realizing the purpose of increasing the total heat transfer quantity of the heat exchanger station under the condition of constant primary water flow rate. The unit focuses on solving the problems of insufficient heat transfer capacity of some heat transfer stations caused by insufficient transportation capacity of existing urban heat networks, heating capacity increasing, and hydraulic imbalance of pipe network system, etc. The absorption heat exchanger can greatly improve the transportation capacity of the heat pipe network, reduce the investment cost of the pipe network construction, and save the operating cost of the system. The research and development of single-effect libr absorption heat exchanger and the experimental study on its performance are carried out in this paper. (1) the mathematical model of lithium bromide absorption heat exchanger is deeply analyzed and established, including the verification and screening of thermal properties and equation of state of lithium bromide solution. Based on this model, the thermal state model of absorption heat exchanger, the heat transfer model of absorption heat exchanger and the hydraulic and structural equations are established respectively. On the basis of the mathematical model equations of absorption heat exchanger, the parameters and degrees of freedom are analyzed, and the essential differences and characteristics between design and simulation are pointed out. A design method for reverse checking and a simulation iterative algorithm based on quasi Newton method are presented. The prototype of experimental absorption heat exchanger is designed, and its operating characteristics are simulated and analyzed. (3) in order to test the performance and operation characteristics of absorption heat exchanger, the design and construction of 400kW heat transfer test bench are completed. The experiment bench can complete the experiment of heat transfer and refrigeration, as well as the experiment of different series-parallel connection forms and operating conditions. The suitable instrument and data acquisition system are selected and installed. The experimental arrangements and steps are designed in detail. (4) the performance tests of absorption heat exchanger are carried out on the test bench, including design conditions, variable flow rate, variable water temperature, non-condensable gas and so on. The water pollution of coolant is analyzed. The experimental results show that the heat transfer effect of absorption heat exchanger is good, and the design and simulation method proposed in this paper is correct and feasible. The paper can provide theoretical and data reference for the design and operation of absorption heat exchanger.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83
本文编号：2414168
[Abstract]:Lithium bromide absorption heat exchanger is a new type of large temperature difference heat transfer system, which is different from the traditional plate heat exchanger. It cleverly integrates the traditional plate heat exchanger and the lithium bromide absorption heat pump into a new system. The principle of absorption heat pump is applied to the heat transfer station to realize the local heat transfer from low temperature to high temperature of the heat exchanger unit, and to increase the heat transfer temperature difference of the primary water side, thus realizing the purpose of increasing the total heat transfer quantity of the heat exchanger station under the condition of constant primary water flow rate. The unit focuses on solving the problems of insufficient heat transfer capacity of some heat transfer stations caused by insufficient transportation capacity of existing urban heat networks, heating capacity increasing, and hydraulic imbalance of pipe network system, etc. The absorption heat exchanger can greatly improve the transportation capacity of the heat pipe network, reduce the investment cost of the pipe network construction, and save the operating cost of the system. The research and development of single-effect libr absorption heat exchanger and the experimental study on its performance are carried out in this paper. (1) the mathematical model of lithium bromide absorption heat exchanger is deeply analyzed and established, including the verification and screening of thermal properties and equation of state of lithium bromide solution. Based on this model, the thermal state model of absorption heat exchanger, the heat transfer model of absorption heat exchanger and the hydraulic and structural equations are established respectively. On the basis of the mathematical model equations of absorption heat exchanger, the parameters and degrees of freedom are analyzed, and the essential differences and characteristics between design and simulation are pointed out. A design method for reverse checking and a simulation iterative algorithm based on quasi Newton method are presented. The prototype of experimental absorption heat exchanger is designed, and its operating characteristics are simulated and analyzed. (3) in order to test the performance and operation characteristics of absorption heat exchanger, the design and construction of 400kW heat transfer test bench are completed. The experiment bench can complete the experiment of heat transfer and refrigeration, as well as the experiment of different series-parallel connection forms and operating conditions. The suitable instrument and data acquisition system are selected and installed. The experimental arrangements and steps are designed in detail. (4) the performance tests of absorption heat exchanger are carried out on the test bench, including design conditions, variable flow rate, variable water temperature, non-condensable gas and so on. The water pollution of coolant is analyzed. The experimental results show that the heat transfer effect of absorption heat exchanger is good, and the design and simulation method proposed in this paper is correct and feasible. The paper can provide theoretical and data reference for the design and operation of absorption heat exchanger.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83
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