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建立了机械蒸汽再压缩系统的热力学模型,并对换热器无相变瞬态传热分析的模型进行了简化。在此基础上,以加热后的料液显热作为启动热源,以稳态计算数据为基础,利用迭代法对系统非稳态运行过程进行了模拟。结果表明,在闪蒸阶段,系统内蒸汽流量增长较快,当换热量达到蒸发器换热的最大值时,蒸汽流量出现明显拐点,并呈下降趋势直至稳态;系统约在2500 s后达到稳态运行。压缩机最大功率及最大进气量均出现在非稳态运行过程中,与稳态值相比分别高出41.89%和32.56%。(A thermodynamic model of a mechanical vapor recompression system is established, and the no phase change transient heat transfer model of heat exchanger is simplified. Based on this, unsteady running progress using sensible heat of heated feed liquid as starting heat source is simulated by using iterative method based on steady state calculation data. The results show that the vapor flow rate grows rapidly in the beginning, forming an apparent inflection point when the heat exchange reaches maximum. Thereafter the flow rate is gradually reduced to the steady state after slowly increasing to a maximum value. Eventually, this progress costs about 2500 seconds. Both the maximal compressor power and the maximal compressor intake flowrate are acquired during the unsteady running progress, which are 41.89% and 32.56% higher than the steady state value, respectively. )
The thermodynamic model of the mechanical vapor recompression system is established and the model of transient heat transfer without phase transition of the heat exchanger is simplified. On the basis of this, the sensible heat of the heated liquid was taken as the starting heat source. Based on the steady state calculation data, the unsteady operation of the system was simulated by iterative method. The results show that during the flash stage, the steam flow in the system increases rapidly. When the heat transfer reaches the maximum value of the evaporator heat transfer, the steam flow shows a significant inflection point and shows a downward trend until it reaches a steady state. After 2500 s Achieve steady-state operation. Compressor maximum power and maximum air intake all appear in the unsteady running process, respectively, compared with the steady-state value of 41.89% and 32.56% higher. A thermodynamic model of a mechanical vapor recompression system is established, and the no phase change transient heat transfer model of heat exchanger is simplified. Based on this, unsteady running progress using sensible heat of heated feed liquid as starting heat source is simulated by using iterative method based on steady state calculation data. The results show that the vapor flow rate grows rapidly in the beginning, forming steady state after gradually increasing to Both the maximal compressor power and the maximal compressor intake flowrate are acquired during the unsteady running progress, which are 41.89% and 32.56% higher than the steady state value, respectively.