天然气分布式能源系统高效性、经济性评价

Evaluation of Efficiency and Economy of Natural Gas Distributed Energy System

结合工程实例,对天然气分布式能源系统的高效性(评价指标为节能率)进行评价,对经济性的影响因素进行分析。经济性指标为静态投资回收期,影响因素:单因素:项目总投资额、天然气价格、运行时间、售电价格、售冷价格;双因素:单位发电功率投资额+电气比(售电价格与天然气价格比)、单位发电功率投资额+冷气比(售冷价格与天然气价格比)。运行时间、售电价格、售冷价格对静态投资回收期的影响一致,随着运行时间、售电价格、售冷价格的延长和增大,静态投资回收期缩短,3个因素的影响显著性依次减弱。天然气价格、项目总投资额对静态投资回收期的影响一致,随着天然气价格、项目总投资额的增大,静态投资回收期延长,天然气价格的影响更.显著。单位发电功率投资额一定时,静态投资回收期随电气比的增大而缩短。电气比一定时,静态投资回收期随单位发电功率投资额的减小而缩短。单位发电功率投资额越小,电气比越大,静态投资回收期越短。单位发电功率投资额一定时,静态投资回收期随冷气比的增大而缩短。冷气比一定时,静态投资回收期随单位发电功率投资额的减小而缩短。单位发电功率投资额越小,冷气比越大,静态投资回收期越短。

Based on engineering examples,the efficiency of the natural gas distributed energy system(evaluation index is energy saving rate)is evaluated,and the factors affecting the economy are analyzed.The economic index is the static investment payback period,the influencing factors:single factor:total project investment,natural gas price,operating time,electricity sales price,cooling sales price;double factor:unit electricity investment+electricity/gas ratio(rati-0 of electricity sales price to natural gas price),unit electricity investment+cooling/gas ratio(ratio of cooling sales price to natural gas price).Operating time,electricity sales price and cooling sales price have the same influence on the static investment payback period.With the extension and increase of operating time,electricity sales price,cooling sales price,the static investment payback period shortens,and the influence significance of the three factors decreases in turn.The natural gas price and the total project investment have the same impact on the static investment payback period.With the increase of the natural gas price and the total project investment,the static investment payback period is extended,and the impact of the natural gas price is more significant.When the unit electricity investment is fixed,the static investment payback period shortens with the increase of the electricity/gas ratio..When the electricity/gas ratio is fixed,the static investment payback period shortens with the decrease of the unit electricity investment.The smaller the unit electricity investment,the greater the electricity/gas ratio,and the shorter the static investment payback period.When the unit electricity investment is fixed,the static investment payback period shortens with the increase of the cooling/gas ratio.When the cooling/gas ratio is fixed,the static investment payback period shortens with decrease of the unit electricity investment.The smaller the unit electricity investment,the greater the cooling/gas ratio,and the shorter the static investment payback period.