Flue gas cooling and heat exchanger with cooling device for desulfurization flue opening

Abstract

The invention discloses a flue gas cooling and heat exchanger with a cooling device for a desulfurization flue opening. The device comprises a flue gas inlet and outlet, a primary cooling cooler, a cryogenic condenser, a fin, a water collector, a water mist nozzle, an axial flow fan, a water collecting tank, a circulating water pump, a water treatment system, a refrigerant inlet and outlet and a cooling water inlet and outlet. According to the device, the whole device adopts a mode that a cooling medium is arranged in a tube, a saturated wet smoke gas flows out of the tube, the hot flue gas enters the lower primary cooling cooler through the flue gas inlet to be primarily condensed, after the temperature is reduced to a certain degree, cooling is carried out through the upper cryogenic condenser, after the cooled flue gas is the same as the ambient temperature, the flue gas enters a smoke discharging tower to be discharged through the flue gas outlet. According to the flue gas coolingand heat exchanger with the cooling device for the desulfurization flue opening, the multi-stage cooling mode is adopted, so that the moisture content of the flue gas is greatly reduced, the phenomenon of ''white smoke'' at the outlet of the smoke discharging tower is eliminated, and meanwhile, the waste heat in the wet flue gas can be recycled for civil heating, hot water, refrigeration or low-temperature power generation and the like.

Description

technical field [0001] The invention relates to flue gas dehumidification and waste heat recovery and utilization technologies, in particular to a flue gas cooling heat exchanger with a refrigeration device at the mouth of a desulfurization flue. Background technique [0002] The limestone gypsum wet desulfurization package technology introduced by my country includes a flue gas reheater, which is called GGH (Gas-Gas Heater) in the industry, and its temperature is raised to above 80°C through indirect heat exchange between wet flue gas and dry flue gas emission. The advantage of using the GGH reheater is that only one set of heat exchangers is needed, and some problems such as blockage, corrosion, and excessive emissions caused by the application of the application have affected the normal operation of the power plant. Subsequently, the heat medium circulating flue gas reheater MGGH (Media Gas-Gas Heater) was introduced, and two sets of heat exchangers for cooling and heatin...

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Problems solved by technology

There are good reasons to believe that according to my country's current air pollution control standards, even if coal-burning and other related industries fully meet the ultra-low and near-zero emission standards, the smog pollution cannot be solved.

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