A thermal power plant boiler exhaust heat recovery system

Abstract

The invention discloses a waste heat recovery system for smoke discharging of a thermal power plant boiler. The waste heat recovery system for smoke discharging of the thermal power plant boiler aims at solving the problem of the heat loss of smoke discharging of an existing thermal power plant boiler. Multiple sets of separation type heat pipe heat exchangers are adopted and are composed of heat absorbing sections and heat releasing sections, and the heat absorbing sections and the heat releasing sections are connected through pipelines to form loops. Heat exchange media are heated by smoke in the heat absorbing sections and evaporated into steam to enter the heat releasing sections to be condensed into liquid, the heat exchange media of at least one set of heat exchangers have different saturation temperatures, and at least one set of separation type heat pipe heat exchangers have different working pressure and working temperatures. Thus, it is ensured that the arrangement mode is flexible, and the resistance of a flue is reduced; the temperature difference between the smoke and the heated media is reduced, and heat economy performance is good.

Description

technical field

[0001] The invention belongs to boiler waste heat recovery and energy-saving technology, and in particular relates to a waste heat recovery system for exhaust smoke of a boiler in a thermal power plant. Background technique

[0002] Exhaust heat loss is the main heat loss of boilers in thermal power plants. The design exhaust gas temperature of modern large-scale thermal power boilers is about 120°C, and the corresponding exhaust gas heat loss accounts for about 5% of the heat released by the boiler fuel. As the temperature of boiler exhaust flue gas rises, the heat loss of the exhaust flue gas also increases, which not only wastes energy, but also increases the water consumption of the desulfurization system. In order to improve the operating economy of power plants, low-temperature economizer technology, which utilizes boiler exhaust waste heat to heat condensate water, has been widely used in thermal power enterprises in my country in recent years. It is ...

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