A wet flue gas self-returning integrated flue gas purification device and its application

Abstract

The invention relates to a wet smoke self-temperature returning integrated smoke purification device and an application thereof. The device comprises a washing tower outer barrel, a smoke outlet, an absorbing liquid storing cavity and a gas inlet flue extending barrel, the smoke outlet is disposed at the top of the washing tower outer barrel, the absorbing liquid storing cavity is arranged below the washing tower outer barrel, the gas inlet flue extending barrel is connected with the side of the washing tower outer barrel and extends to inside of the washing tower outer barrel, a smoke inlet is arranged at the front end of the gas inlet flue extending barrel, a same-direction fair current spraying head and a reverse spraying head are arranged inside the gas inlet flue extending barrel, directions of liquid drop sprayed by the same-direction fair current spraying heads and smoke flowing direction are the same, vertical opposite spraying is formed with the reverse spraying heads, and foam induction rings are arranged between the same-direction fair current spraying heads and the reverse spraying heads. According to the wet smoke self-temperature returning integrated smoke purification device and the application thereof, multiple functions such as dust removing, desulfuration, defogging and smoke heat exchange are integrated, device structure is compact, the floor space is small, the problems of 'white smoke' or chimney rain of wet purification smoke can be remarkably eliminated, and influence of smoke discharging on surroundings or vision can be reduced.

Description

technical field [0001] The invention relates to air pollution control equipment and technology in the field of environmental protection, in particular to a wet flue gas self-refreshing integrated flue gas purification device and its application. Background technique [0002] At present, my country's haze pollution problem is severe, making ordinary residents pay more attention to the flue gas emitted by the chimneys of industrial enterprises. "White smoke" from chimneys and chimney rain have become one of the main objects of complaints from residents around industrial and mining areas. In fact, most of this kind of flue gas is treated by environmental protection measures, and the main pollutants in it have reached the emission standard. However, due to the wet treatment technology used in dust removal, cooling, desulfurization and other purification processes, the exhaust gas temperature is too low ( Usually at 45-55°C), and the water vapor is in a saturated or supersaturat...

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Problems solved by technology

In fact, most of this kind of flue gas is treated by environmental protection measures, and the main pollutants in it have reached the emission standard. However, due to the wet treatment technology used in dust removal, cooling, desulfurization and other purification processes, the exhaust gas temperature is too low ( Usually at 45-55°C), and the water vapor is in a saturated or supersaturated state, causing the water in the flue gas to condense rapidly into small droplets near the chimney outlet, making the flue gas white, or even forming large droplets. Falling near the chimney, forming the phenomenon of "chimney rain"

[0003] The "white smoke" or "chimney rain" of the chimney may cause four environmental problems: (1) the temperature of the wet flue gas is relatively low, and the lift height is small, which will cause relatively high concentrations of ground pollution; (2) will The smoke plume is white due to the condensation of water vapor, which affects people's vision; (3) the condensed water may cause precipitation in the downwind direction of the chimney, which affects the climate in some areas; (4) after the flue gas is wet desulfurized, although SO 2 content is greatly reduced, but for SO in flue gas 3 The total content of the flue gas can only be removed by 40-50%. Since the acid dew point temperature range of the flue gas is reduced from 105-111.6°C before desulfurization to 70.5-90°C after desulfurization, and the net flue gas temperature after the FGD system is about 50°C, the chimney The temperature of the inner wall is far lower than the acid dew point temperature, so that the residual SO in the flue gas 3 It is easy to condense and dissolve in the condensate attached to the inner wall of the chimney, making the condensate highly corrosive

Such methods are also limited to high-temperature and high-humidity flue gas, and are not suitable for most flue gas after wet desulfurization

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