基于稳态建模技术的燃气多联供机组经济性分析

Economic Analysis of CHP Unit based on Steady-State Modeling Technology

针对综合能源系统内的燃气多联供展开稳态建模研究,结合成本模型及收益模型开展机组经济性分析。选取GE公司6F.03燃机,研究了燃气多联供机组的供热功率及供电功率耦合关系,开展了包含天然气价格、蒸汽销售价格、蒸汽抽取量、年利用小时数和上网电价在内的多因素敏感性分析。结果表明:通过外供蒸汽流量调节,可满足不同供热及供电功率需求,当外供20 t/h蒸汽时,可提供16.17 MW的供热功率及109 MW供电功率;天然气价格敏感性分析表明,要实现低于10年的投资回收期,应将天然气价格控制在3.25元/m3以内;增大蒸汽供应量能够提高机组的经济性;上网电价的敏感性最为显著,当低于0.5元/(kW·h),投资回收期会超过24年,但当上网电价达到0.7元/(kW·h),投资回收期可降低至5年。

The energy supply system of Integrated Energy System(IES)usually contains renewable energy and Combined Heat and Power unit(CHP).Heat and electricity can be transported to different end users through transporting networks.In this paper,the steady-state model of CHP unit,as well as its cost and income model were established.The performance and economic analysis of CHP unit was done based on these models.6F.03 gas turbine was adopted in a case study to investigate the coupling relationship between heat and power supply,and to study the multi-factor sensitivity analysis including natural gas price,steam sale price,steam extraction amount,annual utilization hours and electricity price.It has been found that the different ranges of heat and electricity demands can be met by adjusting the steam extraction amount.The heat supply power reaches 16.17 MW,and the electricity power reaches 109 MW when the steam extraction amount reaches 20 t/h.The natural gas price sensitivity analysis shows that the investment recovery period can be less than 10 years if the natural gas price is less than 3.25 RMB/m3.The steam extraction amount sensitivity analysis shows that the investment recovery period will decline when the steam extraction amount is increased.Electricity price has the most noticeable influence on the investment recovery period.The investment recovery period is up to 24 years if electricity price is less than 0.5 RMB/kWh,and it will decline to 5 years if the electricity price is 0.7 RMB/kWh.