Adjusting type phase-change heating medium heat transfer device

Abstract

The invention provides an adjusting type phase-change heating medium heat transfer device which comprises a plurality of replacement pipes; each replacement pipe comprises an outer pipe and an inner pipe; the inner pipes are located in the outer pipes; the inner pipes and the outer pipes are arranged at intervals; the outer pipes are communicated; the inner pipes are communicated; liquid inlet ends of the replacement pipes are provided with outer pipe liquid inlets and inner pipe liquid outlets; the outer pipe liquid inlets and the inner pipe liquid outlets are formed in a staggered mode; liquid outlet ends of the replacement pipes are provided with outer pipe liquid outlets and inner pipe liquid inlets; and the outer pipe liquid inlets and the inner pipe liquid outlets are formed in a staggered mode. According to the adjusting type phase-change heating medium heat transfer device, the heat efficiency of heat utilization equipment is improved, meanwhile, the phenomena of low-temperature corrosion and ash blocking caused by moisture condensation are avoided, the problem of low-temperature corrosion is solved, waste heat in smoke is recycled through heated fluid, and the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to the technical field of liquid-phase intermediate medium heat exchange, in particular to an adjustable phase-change heat medium heat transfer device. Background technique [0002] The air preheater or low-temperature economizer used in the current industrial kilns or power plant boilers with high sulfur and high water content has a relatively low temperature on the cold end wall, sometimes reaching the water dew point (acid dew point) or even lower. Condensation on the metal surface of the heater increases the amount of ash accumulation, which can easily lead to serious ash accumulation and corrosion in the low-temperature section of the heat exchanger. When the wall temperature of the heating surface drops to the dew point, condensation begins to form on the heating surface, and the ash particles in the flue gas become larger. It is easy to stick to the heating surface to form ash. In the ash deposit, most of the soluble substa...

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Problems solved by technology

[0002] The air preheater or low-temperature economizer used in the current industrial kilns or power plant boilers with high sulfur and high water content has a relatively low temperature on the cold end wall, sometimes reaching the water dew point (acid dew point) or even lower. Condensation on the metal surface of the heater increases the amount of ash accumulation, which can easily lead to serious ash accumulation and corrosion in the low-temperature section of the heat exchanger. When the wall temperature of the heating surface drops to the dew point, condensation begins to form on the heating surface, and the ash particles in the flue gas become larger. It is easy to stick to the heating surface to form ash. In the ash deposit, most of the soluble substances are tar, naphthalene, aluminum, calcium and iron sulfate, etc., among which aluminum sulfate and calcium sulfate are formed by the action of hot concentrated sulfuric acid. Yes, ferric sulfate is mainly produced by the reaction of sulfuric acid and iron oxide in ash, and also includes the iron oxide layer on the heating surface and the product of steel itself being corroded by sulfuric acid. When the temperature of the smoke increases, the excess acid in the deposition layer will evaporate, drying the ash and forming The ash layer that is difficult to remove by soot blowing will cause ash blockage. Severe ash blockage will lead to deterioration of the use of heat exchangers, a sharp increase in resistance, increased power consumption of fans, and even affect the normal smoke exhaust of kilns (boilers). The boiler cannot operate normally, and at the same time, the metal tube wall of the heat exchanger will be corroded rapidly due to the heavy dust covering under the catalysis of acid dew, resulting in an extremely short service life of the heat exchanger

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