Exergy analysis of a polygeneration-enabled district heating and cooling system based on gasification of refuse derived fuel
Exergy analysis of a polygeneration-enabled district heating and cooling system based on gasification of refuse derived fuel
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DOI：
10.1016/j.jclepro.2016.09.151
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发表时间：
2017-01
影响因子：
11.1
通讯作者：
Natalia Kabalina;Mário Costa;Weihong Yang;Andrew Martin;M. Santarelli
中科院分区：
文献类型：
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作者：
Natalia Kabalina;Mário Costa;Weihong Yang;Andrew Martin;M. Santarelli
区域加热和冷却（DHC）系统，通过气化器和气体提质设备的整合而修改或改造，代表了传统方法的有前途的替代方案，因为可以实现补充热、冷和电的产品的各种方案，即：仅炭;炭和合成气;炭、合成天然气（SNG）和氢气（H2）;以及炭、合成气、SNG和H2。本文从火用学和火用经济学的角度详细评估了多联产DHC系统（典型年份的运行）。基本DHC系统使用天然气作为燃料，标称容量为29 MW热，35 MW冷和5 MW电。改造采用垃圾衍生燃料（RDF）作为原料的大气气化炉与下游的气体净化，气体涡轮机，和热回收蒸汽发生器沿着与热交换器集成的基础DHC系统。分析表明，多联产系统在所有情况下都有足够的性能。在增值产品组中，焦炭和合成气的组合是最有益的，因为系统效率达到72%的值。火用经济分析的结果支持火用结果。最大限度地同时生产焦炭和合成气，实现了增值产品的较低生产成本，其中每种成本估计为6.1美元/GJ。
District heating and cooling (DHC) systems, modified or retrofitted with integration of gasifiers and gas upgrading equipment, represent promising alternatives to traditional approaches since various scenarios of products complementary to heat, cold, and electricity can be realized, namely: char only; char and syngas; char, synthetic natural gas (SNG) and hydrogen (H2); and char, syngas, SNG and H2. This manuscript evaluates a polygeneration-enabled DHC system in detail (operation during a typical year) from exergetic and exergoeconomic perspectives. The base DHC system utilizes natural gas as fuel with a nominal capacity of 29 MW heat, 35 MW of cold, and 5 MW of electricity. The retrofit employs refuse derived fuel (RDF) as feedstock to an atmospheric gasifier with downstream gas clean-up, a gas turbine, and a heat recovery steam generator along with heat exchangers for integration with the base DHC system. The exergy analysis revealed that the polygeneration system presents adequate performance at all scenarios established. Among the sets of value-added products the combination of char and syngas is the most beneficial as the system efficiency reaches a value of ∼72%. The outcomes of the exergoeconomic analysis support the exergy results. The lower production costs for value-added products are achieved for the maximum simultaneous char and syngas production, with each of these costs estimated to be 6.1 USD/GJ.