Engine-boiler coupled deep waste heat utilization system for air cooling unit

Abstract

The invention belongs to the field of energy conservation and emission reduction of thermal power units, and particularly relates to an engine-boiler coupled deep waste heat utilization system for an air cooling unit. The system mainly comprises an air pre-heater, multistage bled steam type air heaters, a feed water heater, a condensed water heater and a low-temperature economizer, the primary bled steam type air heater uses waste steam preheated air, the other bled steam type air heaters use low-level to high-level turbine bled steam preheated air, the heat absorption capacity of the preheated air in the air pre-heater is decreased, the amount of flue gas needed by the air pre-heater is also decreased, residual flue gas is led to a bypass flue parallelly connected with the air pre-heater, the feed water heater and the condensed water heater are arranged in the bypass flue and used for heating feed water and condensed water respectively, and regenerative extraction steam is squeezed out to increase power of a turbine. The system recycles high-parameter waste steam and waste heat of low-level bled steam of the air cooling unit, improves the grade of heat and has fine energy-saving effects.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction of thermal power units, and in particular relates to a deep utilization system of residual heat coupled with an air-cooling unit and a furnace. Background technique [0002] In order to reduce pollutant emissions and improve energy utilization efficiency, more and more large-capacity thermal power units have been put into use. But for water-poor and water-scarce areas, the water consumption of power plants has become a big problem with the simultaneous increase of unit capacity. At present, the main method to solve this problem is to use the air cooling system. Compared with wet cooling, the outstanding advantage of air cooling is water saving. This system uses the air in the environment to condense the exhaust steam of the steam turbine, which can reduce the water supply of the power plant by 75%. However, due to the high back pressure of air-cooled units and low thermal cycle...

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Problems solved by technology

However, due to the high back pressure of the air-cooled unit and the low thermal cycle efficiency, the coal consumption of power generation is higher than that of the wet-cooled unit, which is contrary to the original intention of investing in large-capacity thermal power units

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