Downstream centrifugal flue gas waste heat recovery device

Abstract

The invention discloses a downstream centrifugal flue gas waste heat recovery device. A horizontal flue (2) is provided with a contraction acceleration mixing section (3), the contraction acceleration mixing section (3) is connected with a rotational flow tower (6), a drainage plate (10) is arranged on the tower wall of the rotational flow tower (6), an eccentric stainless steel center cylinder (7) is arranged in an inner chamber of the rotational flow tower (6), the upper portion of the eccentric stainless steel center cylinder (7) is connected with a tube bundle demister (20), the tube bundle demister (20) is connected into a chimney (14) through a flue, the bottom of a pool (15) on the lower portion of the rotational flow tower (6) is connected with a cooling water circulating pump (12) through a pipeline, the other end of the cooling water circulating pump (12) is connected into a lithium bromide absorption heat pump unit (13) through the pipeline, and an output pipeline of the lithium bromide absorption heat pump unit (13) is separately connected with a nozzle (4), a spraying water curtain (5) and water treatment equipment (16). According to the downstream centrifugal flue gas waste heat recovery device, the defect of large system power consumption caused by large flue gas resistance of a spray-method flue gas condensation waste heat recovery technology is effectively solved, and the capability of extracting heat from flue gas is improved as condensed water and flue gas are fully mixed.

Description

technical field [0001] The invention relates to a downstream centrifugal flue gas waste heat recovery device. Background technique [0002] The flue gas discharged from the thermal power plant boiler still carries a large amount of heat and water vapor after passing through the desulfurization tower. The heat carried causes a waste of energy in thermal power plants; after the saturated clean flue gas carrying a large amount of water vapor is discharged from the chimney, the water vapor condenses into mist water droplets, and after light refraction or scattering, the wet flue gas appears white or gray, which is the so-called "White smoke", this "white smoke" will cause environmental pollution to a certain extent. [0003] In view of the above problems, many flue gas waste heat recovery technologies have emerged among the disclosed technologies. One of the technologies is the spray method flue gas condensation waste heat recovery technology, adding a spray tower and a heat p...

AI Technical Summary

Problems solved by technology

The main problems of this technical method are: (1) Due to the reverse arrangement of the spray water and the flue gas, the flow resistance of the flue gas will be significantly increased, and the original induced draft fan needs to be modified to increase the load and increase the power consumption of the system; 2) Water droplets formed by spraying water rely on gravity to fall and mix with flue gas for heat exchange. The particle size of water droplets is large, the mixing heat transfer efficiency is low, and the heat extracted from flue gas is low.

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