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Operation strategy and suitability analysis of CHP system with heat recovery

机译：热回收CHP系统运行策略及适用性分析

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摘要

In order to coordinate and balance the demand of combined heat and power (CHP) system, a solution of optimal operation strategy of CHP system with heat recovery in a distributed energy system has been presented. This paper will discuss more deeply the suitability of the CHP system under different operation strategies. The selections of electricity determined by heat load (EDHL) and heat load determined by electricity (HLDE) are actualised by Aspen Plus and formula computing. In addition, the performance difference of the CHP system operating in EDHL and HLDE is analysed by comparing thermoelectric output and fuel consumption. The result shows that the optimal heat to power ratio (HPR) is 1.75 and is derived when the electric output is approximately equal to the electric demand and the heat output is approximately equal to the heat demand. EDHL is the optimal selection when the HPR is greater than or equal to 1 and less than 1.75, and HLDE is adopted suitably when the HPR is greater than 1.75 and less than or equal to 2.5. Additionally, the total thermal efficiency does not vary with increasing or decreasing regenerative temperature or variable HPR on CHP system, maintaining 87-88% thermal efficiency, meanwhile, the total exergy efficiency is about 24.7%-28.8% when the CHP systems operate in EDHL, and 23.1%-31.4% When the CHP systems operate in HLDE. The final research results show that, it has great significance in operation strategy and suitability analysis of the CHP system. (C) 2017 Elsevier B.V. All rights reserved.
机译：为了协调和平衡热电联产系统的需求，提出了一种分布式能源系统中具有热回收的热电联产系统最优运行策略的解决方案。本文将更深入地讨论CHP系统在不同操作策略下的适用性。由Aspen Plus和公式计算可实现对由热负荷（EDHL）确定的电力和由电（HLDE）确定的电力的选择。此外，通过比较热电输出和燃料消耗，分析了在EDHL和HLDE中运行的CHP系统的性能差异。结果表明，最佳热功率比（HPR）为1.75，是在电输出近似等于电需求并且热输出近似等于热需求时得出的。当HPR大于或等于1且小于1.75时，EDHL是最佳选择，而当HPR大于1.75且小于或等于2.5时，则适当采用HLDE。此外，总热效率不随温度的升高或降低或热电联产系统的HPR的变化而变化，保持热效率为87-88％，而当热电联产系统在EDHL中运行时，总火用效率约为24.7％-28.8％。 ，以及当CHP系统在HLDE中运行时为23.1％-31.4％。最终研究结果表明，它对CHP系统的运行策略和适用性分析具有重要意义。 （C）2017 Elsevier B.V.保留所有权利。

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