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Increased power to heat ratio of small scale CHP plants using biomass fuels and natural gas

机译：使用生物质燃料和天然气的小型热电联产厂的电热比提高

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摘要

In this paper, we present a systematic study of process changes for increased power production in 1-20 MW_e combined heat and power (CHP) plants. The changes are simulated, and their economic feasibility evaluated by using existing small scale CHP case plants. Increasing power production in decentralised CHP plants that operate according to a certain heat demand could reduce the fuel consumption and CO_2 emissions per power unit produced and improve the feasibility of CHP plant investments. The CHP plant process changes were simulated under design and off design conditions and an analysis of power and heat production, investment costs and CO_2 emissions was performed over the whole annual heat demand. The results show that using biomass fuels, there are profitable possibilities to increase the current power to heat ratios, 0.23-0.48, of the small scale CHP plants up to 0.26-0.56, depending on the size of the plant. The profitable changes were a two stage district heat exchanger and the addition of a steam reheater and a feed water preheater. If natural gas is used as an additional fuel, the power to heat ratio may be increased up to 0.35-0.65 by integrating a gas engine into the process. If the CO_2 savings from the changes are also taken into account, the economic feasibility of the changes increases. The results of this work offer useful performance simulation and investment cost knowledge for the development of more efficient and economically feasible small scale CHP processes.
机译：在本文中，我们对1-20 MW_e热电联产（CHP）电厂提高发电量的过程变化进行了系统研究。通过使用现有的小型CHP案例工厂对变化进行模拟，并评估其经济可行性。根据一定的供热需求运行的分散式热电联产电厂的发电量增加，可以减少单位生产的燃料消耗和CO_2排放，并提高了热电联产电厂投资的可行性。在设计和非设计条件下模拟了热电联产工厂的工艺变化，并在整个年度供热需求中进行了电力和热量生产，投资成本和CO_2排放量的分析。结果表明，使用生物质燃料，有可能将小型热电联产电厂的当前热能比（0.23-0.48）提高到0.26-0.56，这取决于电厂的规模。有利可图的变化是两级区域热交换器，并增加了蒸汽再热器和给水预热器。如果将天然气用作附加燃料，则通过将燃气发动机集成到过程中，可以将功率与热比提高到0.35-0.65。如果还考虑到变更带来的CO_2节省，则变更的经济可行性会提高。这项工作的结果为开发更有效和经济可行的小型CHP工艺提供了有用的性能模拟和投资成本知识。

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