烟气型双效溴化锂制冷机的可视化设计

根据溴化锂水溶液的相关物性计算模型,提出了当已知溴化锂溶液比焓和浓度时求其温度的计算机解法,并针对烟气型双效并联溴化锂吸收式制冷机组,利用Visual Basic面向对象的编程技术编制了其可视化设计程序,为工程上设计计算提供了一种高效、快捷的解决方法.     

两级烟气废热热管溴化锂制冷机的可视化设计

根据国内外有关资料与作者拟合的公式,采用Visual basic面向对象的编程技术,对两级烟气废热热管溴化锂制冷机进行了计算机辅助设计研究,并编制了可视化程序,适用于工程上对该系统的设计与计算,缩短设计时间,提高工作效率。     

废热溴化锂吸收式动力、冷、热量梯阶转换系统分析

介绍了一种利用溴化锂溶液的热力学特性,合理安排废热回收的废热溴化锂吸收式动力、冷、热量梯阶转换系统。该系统将其中一部分高品位的能量进行动力转换,其余转换成热量和冷量,实现能量梯阶转换,提高废热能源中可用能的合理利用率。利用自编的计算程序对系统的废热回收量以及能量利用与转换做了详细分析,得出烟气进出口温度对系统的能量转换的影响。     

两级烟气废热热管溴化锂制冷机稳态仿真

利用热管废热溴化锂制冷机不仅能够回收工业过程的大量废热、余热,而且可以提高整个工业系统的能源利用效率。针对两级烟气废热热管溴化锂吸收式制冷机,编写了溴化锂制冷机的设计计算程序和变工况的仿真计算程序,主要研究外界参数变化对系统性能的影响,其结果与理论分析能较好得吻合。对溴化锂制冷机的设计及操作运行、控制调节等具有一定的指导意义。     

烧结烟气余热热电发电模型与数值模拟

针对钢铁工业中的大量烧结烟气余热,提出一种基于热电发电技术的显热回收方案,建立了相应的计算模型,得到了烟气、冷却水、热电单元端点温度沿流动方向的分布特征,分析了烟气温度、烟气换热系数、冷却水换热系数对最优热电单元长度的影响,并分析了热电单元横截面积对电流和电压的影响。结果表明,对于350℃的烧结烟气,每平方米换热面积可以产生约1.47 kW电能,热效率约为4.5%,设备成本的回收周期在4年左右。     

低品位余热驱动制冷问题的探讨

低品位余热的回收应用于制冷是节能减排、保护环境的有效方法之一。文中介绍了目前常用的两种余热驱动制冷的方式,并重点介绍了各种热源应用于溴化锂制冷的情况,最后比较了不同温度热水应用于溴冷机的区别,为余热回收应用于制冷提供理论参考。     

一个跟踪驾驭式可视化系统的设计与实现

在进行数值模拟计算时，人们非常希望能够实时地对计算过程中产生的数据进行可视化显示，从而及时高效地分析数据，并且一旦发现问题，可以对计算程序中的相关参数进行调整或终止程序运行，这不仅有利于提高计算效率，而且对计算程序的改进与发展也有相当大的辅助作用。为此，开展了跟踪驾驭式可视化技术的研究，并设计开发了一个在单机环境下运行的跟踪驾驭式可视化系统TSV(Tracking and Steering Visualization)。     

沼气内燃机烟气余热ORC热电联产系统研究

以青岛市某污水处理厂为例分析了该厂现有沼气热电联产系统存在能源利用率及?效率低的问题,并提出了内燃机烟气余热+ ORC热电联产的余热利用方式.通过对改进后系统经济性、环保性及热工性进行计算分析,得到改进后的系统在满足污水厂中温厌氧发酵需热量的前提下全年发电量可增加60.2万kW·h,预计2.67年可收回初投资成本,相比...     

两级烟气废热热管溴化锂发生器的动态特性

利用热管废热溴化锂制冷机不仅能够回收工业过程的大量废热、余热,而且可以提高整个工业系统的能源利用效率。针对两级烟气废热热管溴化锂制冷机发生器的结构特征,建立了动态数学模型,进行了数值求解,得出了机组启动过程中发生器的各参数的变化规律。结果表明:蒸汽发生量与溶液出口温度基本同步稳定,烟气中间为250℃左右,出口温度为200℃左右。此研究对减短启动时间、节约能源具有一定的积极意义。     

驱动热源温度对热管废热溴化锂机组制冷量的影响

介绍了热管废热溴化锂制冷机的工作原理,讨论了驱动热源温度对机组各个发生器制冷量的影响。在给定的温度区间内通过理论计算和分析,得到了高压发生器、低压发生器a和b的制冷量以及它们与总制冷量的比值分别随着烟气进口、中间和出口温度变化的曲线图。论文中还给出最佳中间温度区间,为今后的实验论证提供了理论依据。     

Experimental investigation of a thermoacoustic-Stirling refrigerator driven by a thermoacoustic-Stirling heat engine

In this paper, a thermally-driven thermoacoustic refrigerator system without any moving part is reported. This refrigeration system consists of a thermoacoustic-Stirling heat engine and a thermoacoustic-Stirling refrigerator; that is, the former is the driving source for the latter. Both the subsystems are designed to operate on traveling-wave mode. In the experiment, it was found that the DC-flows had significant negative effect on the heat engine and the refrigerator. To suppress these DC-flows, two flexible membranes were inserted into the two subsystems and worked very well. Then extensive experiments were made to test the influence of different parameters on refrigeration performance of the whole system. The system has so far achieved a no-load temperature of -65 degrees C, a cooling capacity of about 270 W at -20 degrees C and 405 W at 0 degrees C; in fact, the result showed a good prospect of the refrigeration system in room-temperature cooling such as food refrigeration and air-conditioning.     

Rotary heat pump driven by natural gas

This paper describes the development of an efficient cycle based upon the rotation of a hybrid absorption/recompression arrangement. This novel refrigeneration cycle combines a mechanical compressor and absorption system, together with process intensification which exploits radial flow driven by centrifugal force. The system is driven by a gas-engine, in order to utilise the waste heat produced by the engine. The developed cycle avoids the use of CFCs (chlorofluorocarbons). Performance calculations are reported for a cycle using water and lithium bromide (H₂O/LiBr) and water sodium hydroxide-potassium hydroxide-caesium hydroxide (H₂O/NaOHKOHCsOH) as the working fluid. For each of the combinations, the refrigerant is water. This paper also discusses various cycles using different configurations in order to assess their feasibility.     

Gas turbine waste heat driven multiple effect absorption system

In this article, two arrangements of the multiple effect absorption (MEA) type are presented. They are using LiBr-H₂O and are powered by the exhaust of gas turbines. The first arrangement (MEA-I) is used as a cooling device and is coupled to an engine that drives a VC cooling unit. The other one (MEA-II) is used as a solution concentration machine and is coupled to an engine that drives a RO unit.Thermodynamic analysis for MEA-I showed a COP_t of 1.31 and 2.18 for evaporation temperatures of 5°C and 14°C respectively. Relative to the VC, the MEA-I increased the cooling capacity by 65% and 77% with payback periods of 35 months and 29 months for evaporation temperatures of 5°C and 14°C respectively.The MEA-II is analyzed using sea water as an example for a water based solution. Relative to a gas turbine driven RO desalination unit the MEA-II increased the fresh water produced by 13.5%. As a solution concentration machine the MEA-II requires 28% of the heat of evaporation with a solution top temperature of 36°C which makes it equivalent to a machine with five evaporators, where the solution top temperature reaches 66°C. Based on selling the released solvent byproduct water alone, the MEA-II would have a payback period of 77 months.