Economizer capable of recycling waste heat of flue in depth and concealing, desulfurizing and aspirating flue of coal-fired boiler

Abstract

The invention relates to an economizer capable of recycling waste heat of flue in depth and concealing, desulfurizing and aspirating the flue of a coal-fired boiler. The economizer capable of recycling the waste heat of the flue in depth and concealing, desulfurizing and aspirating the flue of the coal-fired boiler mainly comprises heat exchanging pipes, a casing body, a concealed liquid collection opening, a water inlet linkage tank and a water outlet linkage tank. The heat exchanging pipes are made of graphite. The economizer can run far below a acid dew point temperature so as to reduce the temperature of exhausted flue to 60 DEG C or so and recycle sensible heat of the flue and vaporized latent heat of partial steam. Thus, the flue is severely congealed and forms dew and thick congealed liquid membranes are generated on the surfaces of heat exchanging pipes to absorb, suck and remove SO2 and SO3 which occupy 30%-35% of the flue and subtle particles which can not be removed by a regular dust remover and have the function of self-cleaning. The economizer capable of recycling the waste heat of the flue in depth and concealing, desulfurizing and aspirating the flue of the coal-fired boiler is simple in structure, high in heat exchanging efficiency, good in low-temperature resistance and anti-erosion performance, and obvious in reduction of energy consumption and running cost of the boiler and can be widely applied in a coal-fired industrial boiler, a coal-fired utility boiler and even in all coal-fired boilers. Efficiency of the boilers can be improved by 5% to 10 %.

Description

Technical field [0001] The invention provides an economizer for deep recovery and utilization of flue gas waste heat of coal-fired boilers and flue gas condensation desulfurization and dust removal. Specifically, a heat exchanger made of graphite material with good low-temperature corrosion resistance and good thermal conductivity is used for coal-burning The economizer of industrial boilers or coal-fired power plant boilers can operate at temperatures much lower than the acid dew point, deeply recover the sensible heat of flue gas and part of the latent heat of vaporization of water vapor, and use the heat exchange tube surface of the economizer to generate The condensate film absorbs, adsorbs and removes some SO in the flue gas 2 , SO 3 And fine particles that cannot be removed by conventional dust collectors. Background technique [0002] With the increasingly severe global energy security and climate warming situation, there is an urgent need to implement a technical and econ...

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Problems solved by technology

[0012] In order to solve the problems of high exhaust temperature and excessive exhaust heat loss of coal-fired industrial boilers and power plant boilers in my country, the present invention provides an economizer for deep recovery and utilization of waste heat of coal-fired boiler flue gas and flue gas condensation desulfurization and dust removal. Specifically, heat exchangers made of graphite materials resistant to low-temperature acid dew point corrosion and good thermal conductivity are used as economizers for coal-fired industrial boilers or coal-fired power plant boilers, so that they can operate at temperatures far below the acid dew point. Deeply recover the sensible heat of flue gas and the latent heat of vaporization of part of water vapor, and at the same time use the condensate film produced on the surface of the heat exchange tube of the economizer to absorb, adsorb and remove part of SO in the flue gas 2 , SO 3 and fine particles that cannot be removed by conventional dust collectors

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