Turbine-boiler gathered heat energy circulating residual heat reuse system

Abstract

The invention discloses a turbine-boiler gathered heat energy circulating residual heat reuse system and belongs to the technical field of energy conservation and emission reduction of heat energy power equipment. The system comprises a boiler, a boiler-side tail heat energy gathering flue gas system, a steam turbine and a turbine-side combined heat exchange water supply system, wherein a coal saver is arranged on the boiler; the front side of the boiler-side tail heat energy gathering flue gas system is connected to the boiler, the back side thereof is successively connected to a desulfurizing absorption tower and a chimney, the front side of the turbine-side combined heat exchange water supply system is connected to a condenser and the back side thereof is connected to the coal saver, and the boiler-side tail heat energy gathering flue gas system is connected to the turbine-side combined heat exchange water supply system through a condensed water heat exchange system and a water supply heat exchange system. The system disclosed by the invention recovers heat in the flue gas to heat boil feed water and condensed water, so as to push out highly extracted steam and lowly extracted steam, so that the steam turbine efficiency is improved; heat in the flue gas is recovered to heat air so as to improve the boiler efficiency; heat in the tail flue gas is recovered so as to improve the dedustor efficiency, the desulfuration water consumption is reduced and the energy-saving environmental-friendly contributing value is improved.

Description

technical field [0001] The invention relates to a high-efficiency and energy-saving application system for waste heat of flue gas, in particular to a waste heat recovery system for integrated heat energy circulation of a machine furnace, which belongs to the technical field of energy conservation and emission reduction of thermal power equipment. Background technique [0002] The thermal power units put into operation in the early stage in China considered avoiding acid dew point corrosion on the heating surface at the tail. The design exhaust temperature of bituminous coal boilers is generally around 120°C-140°C, and the exhaust gas temperature of high-sulfur fuel boilers can reach about 150°C; add warm air The exhaust gas temperature of the boiler of the boiler can be as high as 150 ℃ to 180 ℃ during actual operation. At this time, the exhaust gas temperature is very high, and the heat of the high-temperature flue gas is directly discharged to the atmosphere without being ...

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Problems solved by technology

[0004] In terms of environmental protection desulfurization, most power plants currently use limestone-gypsum wet desulfurization process, and its optimum desulfurization temperature is around 50°C to 60°C, while the exhaust gas temperature of high-moisture lignite boilers is on the high side, generally exceeding 140 °C, excessively high flue gas temperature will greatly increase desulfurization water consumption, which is not conducive to water saving

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