燃气热电联产系统余热挖潜方式研究

Study of the Modes for Tapping the Latent Power in Utilizing the Waste Heat of a Gas Heat and Power Cogeneration System

针对燃气蒸汽联合循环热电联产机组的烟气和乏汽余热,介绍了3S离合技术、吸收式热泵技术、压缩式热泵技术、吸收式热泵+压缩式热泵技术及基于Co-ah循环供热技术(吸收式换热的热电联产集中供热技术)5种余热利用技术,对其供热能力提升、节能性和经济性进行了定量分析。通过对供热能力提升程度的分析得出,利用5种技术均可以提升供热能力,其中基于Co-ah循环供热技术提升供热能力最大。通过节能性分析得出,5种技术均有节能效果,其中基于Co-ah循环供热技术节能效果更为显著。通过经济性分析得出,增加单位供热能力(1MW)的情况下,在电厂应用吸收式热泵技术和基于Co-ah循环供热技术初投资略高,但运行费用节省也较为明显。综合考虑供热能力提升和经济性两方面因素,基于Co-ah循环供热技术更具优势。

In the light of the waste heat from the flue gases and steam exhausted from a gas-steam combined cycle heat and power cogeneration unit,described were five technologies for utilizing the waste heat,namely,3S clutch technology,absorption type heat pump technology,compression type heat pump technology,absorption type heat pump + compression type heat pump technology and heat supply technology based on the Co-ah cycle( absorption type heat exchange heat and power cogeneration centralized heat supply technology) with their enhancement in the capacity to supply heat,energy-saving and cost-effectiveness being quantitatively analyzed. Through the above-mentioned analysis,the authors have come to a conclusion that all the five technologies can be used to enhance the heat supply capacity and the heat supply technology based on the Co-ah cycle,however,can lead to a maximal rise in the heat supply capacity. An analysis of the energy-saving performance leads us to conclude that all the five technologies can achieve their respective energy-saving effectiveness but the heat supply technology based on the Co-ah cycle can accomplish the most outstanding energy-saving effectiveness. An analysis of the cost-effectiveness induces one to conclude that under the condition of increasing the unit heat supply capacity( 1 MW),if the absorption type heat pump technology and the heat supply technology based on the Co-ah cycle were adopted,the initial investment would be slightly higher than those of the others and the savings in the operation cost,however,would be relatively more obvious. With the factors in the two aspects,i. e. a rise in the heat supply capacity and cost-effectiveness,being considered in a comprehensive way,the heat supply technology based on the Co-ah cycle is regarded as having more leading edges.