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Techno-economic assessment of a biomass-based combined power and cooling plant for rural application
Clean Technologies and Environmental Policy ( IF 4.3 ) Pub Date : 2020-03-12 , DOI: 10.1007/s10098-020-01832-z
Suman Chattopadhyay , Sudip Ghosh

Abstract

This paper presents techno-economic assessment of a biomass-based combined power and cooling plant suitable for off-grid rural areas. The proposed plant employs an indirectly heated air turbine cycle drawing heat from combustion of biomass-derived producer gas. The installation capacity of 50 kW is determined based on the present electricity demand and taking into account the possible demand growth over next 10 years. The gas turbine operating condition is optimized at pressure ratio 10 and turbine inlet temperature 1100 °C, where it shows maximum efficiency. Waste heat of the power generation unit is utilized by a 120 metric ton (MT) cold storage facility that runs on NH3–water vapour absorption refrigeration cycle. Both electrical and thermal storage units are included in the plant to cater to the hourly variations in power and heat demands. Lithium-ion battery is chosen for electrical storage, and Hitec salt-based phase change material is chosen for thermal storage, their storage capacities being estimated at 250 kWh and 220 kWh, respectively. The paper proposes a new method of determining effective cost of electricity, taking into account the avoided electricity for conventional cooling. The effective price of electricity is found to be 0.08 USD/kWh. Estimated payback period of the plant, without subsidy, is 14.4 years, and with 50% capital subsidy this is reduced to 6.6 years. Cost of storage as well as the discount rate is seen to influence the plant economy and payback period considerably. Based on the analysis, a policy recommendation has also been outlined in the paper.

Graphic abstract



中文翻译:

对农村应用的基于生物质的热电联产冷却装置的技术经济评估

摘要

本文介绍了适用于离网农村地区的基于生物质的联合电力和冷却设备的技术经济评估。拟议中的工厂采用间接加热的空气涡轮机循环,该循环从生物质衍生的生产气燃烧中吸收热量。50 kW的安装容量是根据当前的电力需求并考虑未来10年的需求增长而确定的。燃气轮机的工况在压力比为10且汽轮机入口温度为1100°C时进行了优化,从而显示出最大的效率。发电机组的废热由运行在NH 3上的120公吨(MT)冷库利用–水蒸气吸收制冷循环。工厂中包括蓄电和蓄热单元,以适应每小时的电力和热量需求变化。选择锂离子电池进行电存储,选择Hitec盐基相变材料进行热存储,其存储容量估计分别为250 kWh和220 kWh。本文提出了一种新的确定有效电费的方法,其中考虑了传统冷却所避免的电费。电力的有效价格为0.08美元/千瓦时。没有补贴的工厂的预计投资回收期为14.4年,如果有50%的资本补贴,则可以缩短为6.6年。仓储成本以及折现率被认为会显着影响工厂的经济和投资回收期。

图形摘要

更新日期:2020-03-12
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