Energy Efficiency Analysis of Retrofit Scheme of Steam Ejector of Heating Unit
The grid connection of clean energy power generation leads a large number of cogeneration u-nits sometimes difficult to meet the external heat demand in heating seasons.To further improve the heat-ing capacity of heat supply unit of steam ejector and mine the energy saving potentials of the cogeneration unit,reduce the energy loss during heat supply and determine the optimal heating retrofit scheme.This paper established the thermodynamic model of each equipment in modules based on Ebsilon platform,carried out simulation tests,and compared two heating transformation schemes of a power plant.Under typical heating conditions,the impact of heat supply distribution on the amount of steam extraction and system heat consumption rate of the two units was studied.Two kinds of retrofit schemes were proposed in this paper.High backpressure retrofit scheme were the retrofit of cylinder-cutting steam extraction for unit 2,the use of high backpressure exhaust steam for unit 1,and the retrofit of the steam extraction for unit 1.Steam ejector retrofit scheme was based on the high backpressure scheme,in which the steam ejector system of unit 2 was connected in series between the condenser A of the high backpressure heat network and the heater of the heat network,increasing the system ability to utilize energy in a graded manner.The results show that the total heat consumption of the system is reduced by 163 to 338 MW,and the en-ergy efficiency of the system is better after using steam ejector.
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维普
