300MW機組高背壓供熱改造及運行優(yōu)化研究
[Abstract]:The high back pressure heating will increase the pressure inside the condenser of the steam turbine unit, raise the steam turbine exhaust pressure and temperature, make the condenser become the heating network heater in the heating system, and directly heat the circulating water of the heat network. The latent heat of vaporization of steam turbine exhaust is fully utilized, and the loss of cooling source is reduced to zero, which greatly improves the thermal efficiency of the unit. Under the dual action of energy shortage and environmental pressure, many cogeneration units in northern cities are gradually transforming to high backpressure heating mode and the capacity level of retrofit units is also increasing in order to achieve more efficient environmental protection. The research mainly takes the high back pressure heating of 300MW wet cooling unit as the research object, studies the retrofit technology of pure condensing unit with high back pressure, and combines the actual operation parameters of the unit, carries on the theoretical calculation and analysis to the thermal economic performance of the unit. The economic parameters of the unit after high back pressure retrofit are obtained, and the best operation method is found out. Taking the high back pressure heat supply renovation project of No. 2 unit of Huadian Qingdao Company as an example, this paper introduces the retrofit scheme of the unit, and selects the typical operating condition parameters of the unit to calculate and analyze the thermal economy, combining with the heating practice of the company. The optimal operation mode under different climate conditions is obtained by optimizing the operation mode under different external heating conditions. At the same time, the optimization research is carried out from the point of view of energy utilization. By using the theory of total energy system, the exergy loss of high-grade energy in the process of heat transfer is reduced.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM621
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