Demisting system with dedusting, demisting and water recovery functions

Abstract

The invention relates to a demisting system with dedusting, demisting and water recovery functions. The demisting system with the dedusting, demisting and water recovery functions comprises a demister, a supporting plate and a flushing device, wherein the demister is arranged in an absorption tower; the supporting plate is used for fixing the demister; the flushing device is used for flushing the demister; the demister comprises a plurality of demister blades which are configured in parallel; the flushing device comprises a flushing water pipeline and a plurality of spray nozzles; a flushing water recovery device is arranged below the flushing device, and comprises a plurality of water collection pipes which are obliquely arranged, and a water discharge pipe which is used for communicating the water collection pipes with one another and discharging flushing water outside the tower; channels through which fumes circulate are arranged between every two adjacent water collection pipes. According to the demisting system with the dedusting, demisting and water recovery functions, through the combination of the water recovery device, a spray dedusting system and the demister, the dedusting and the demisting on the fumes and the repetitive recycling of water are realized; the purposes of energy conservation and emission reduction are realized; the requirement of near zero emissions of a heat-engine plant is met.

Description

technical field [0001] The invention relates to a dust removal and mist removal purification device, in particular to a mist removal system with functions of dust removal, mist removal and water recovery. Background technique [0002] Dust removal and demisting of flue gas are the most common process sections in the flue gas purification process. There are relatively few optional technical process routes and process equipment for deep dust and fog removal. [0003] At present, more than 95% of the flue gas of the existing large-scale coal-fired boilers in China adopts the limestone-gypsum wet desulfurization process. [0004] For the existing dedusting and demisting process of wet desulfurization and clean flue gas, the process route of "mist eliminator + wet electrostatic precipitator" or "tube bundle dedusting and demisting" can be adopted, which can effectively reduce the emission of dust pollution quantity. But these two kinds of processes all have certain defects. W...

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Problems solved by technology

The bottom of the absorption tower is a slurry pool. Due to the limited water consumption of the absorption tower, the continuously falling flushing water of the demister will dilute the solution in the slurry pool, destroying the water balance in the absorption tower, and also affecting the density and PH value of the slurry. It is not easy to improve the desulfurization effect; on the other hand, in order to achieve the water balance of the slurry tank and maintain the density and pH value of the slurry during desulfurization operation, it may be necessary to reduce the flushing frequency of the demister, which is not conducive to the cleaning of the demister and is likely to cause The blockage of the mist eliminator, and even the desulfurization tower shutdown accident due to the severe blockage of the mist eliminator

[0007] At the same time, the flushing water of the demister directly falls into the slurry pool under the tower. The water collides with the rising flue gas during the falling process, and the large droplets will be blown into small droplets, which will be carried by the flue gas to rise again. The demister, the liquid droplets that are re-carried by the flue gas have been polluted by the desulfurization slurry, and a large number of polluted droplets rise to the demister, which increases the separation load of the demister, which is not conducive to the removal of the demister. The function of dripping makes more solid matter accumulate on the mist eliminator, which is easy to form blockage

[0008] In addition, when the flushing water of the demister falls directly, it first fuses with the slurry sprayed from the nozzle of the slurry spray layer, diluting the slurry immediately, and the whole process is uncontrolled, which seriously affects the instantaneous slurry concentration , leading to an uncontrollable reduction in desulfurization efficiency in the desulfurization reaction

[0009] Since the flushing water of the demister falls directly into the tower, it cannot be reused for flushing the demister. If the water volume exceeds the standard, it even needs to be discharged directly out of the tower, which is not convenient for water saving, energy saving and emission reduction. Currently, the desulfurization tubular demisters on the market are mainly It is a round tube and drop-shaped, and neither has the function of recycling flushing water

[0010] Existing demisters have limited dust removal functions, and can only rely on inertial collision and centrifugal force to remove some tiny dust

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