Power plant flue gas desulfurization absorption tower in-line chimney

Abstract

The invention discloses a power plant flue gas desulfurization absorption tower in-line chimney. The power plant flue gas desulfurization absorption tower in-line chimney comprises a chimney, wherein the chimney adopts a conical cylinder structure, the lower part of the conical cylinder is in transitional connection with an absorption tower through an intermediate conical cylinder, the upper part of an inner cavity of the conical cylinder is provided with a demisting device, and a condensate backflow device is arranged on the outer side of an opening in the top of the conical cylinder. The conical cylinder of the power plant flue gas desulfurization absorption tower in-line chimney disclosed by the invention enables the center of gravity of a chimney section to be lowered obviously, so that the stability and reliability of the whole machine are improved, meanwhile, the outlet flow velocity of flue gas is increased, and greater lifting height and diffusion capability are achieved; by additionally arranging the demisting device and the condensate backflow device, the pollution of chimney rain to the atmosphere and environment is eliminated, the carrying amount of condensate is decreased, the occurrence of 'chimney rain' is alleviated and avoided, and meanwhile, the power plant flue gas desulfurization absorption tower in-line chimney has the effects of lowering investment and saving energy.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization in power plants, in particular to a wet-process flue gas desulfurization absorption tower direct discharge chimney. Background technique [0002] In the prior art, the wet desulfurization of flue gas in power plants uses the absorption tower to be discharged directly into the chimney, and the desulfurized flue gas is discharged through the wet chimney. It saves the investment of heat exchangers (the investment of large heat exchangers even reaches tens of millions, and the resistance of heat exchangers is about 1000Pa), reduces the cost and energy consumption of booster fans, and further reduces the clean flue And the investment in equipment such as auxiliary baffle doors, thus greatly reducing the cost of wet desulfurization. After adopting the straight chimney, its anti-corrosion measures can be the same as that of the absorption tower, and the anti-corrosion material of glass ...

AI Technical Summary

Problems solved by technology

But there are also some problems like this: (1) smoke diffusion problem

If the outer diameter of the chimney is too large, a larger low-pressure area will be generated on the leeward side of the chimney. Therefore, a chimney with multiple inner flues is more likely to have smoke downwash than a single flue.

The low-temperature flue gas emitted by the wet chimney has a small lift and a low vertical diffusion velocity, which is prone to downwashing of the flue gas.

(2) Blackness measurement of plume

After the saturated hot flue gas leaves the chimney, the temperature drops and water mist is formed. This white flue gas containing more water and other crystalline substances will reduce the blackness of the flue gas, so that the measured blackness of the flue gas cannot truly reflect the pollution situation.

(3) The problem of condensate carried by flue gas

Since the clean flue gas after desulfurization still contains a small amount of harmful components such as SO2, SO3 and dust, the emergence of "chimney rain" will bring new pollution problems

[0004] The chimney that has in the prior art adopts figure 1 In the structure shown, the A-A section in the figure is the section with the most concentrated stress, and the upper part adopts tower style, self-supporting type, cable type and other reinforcement structures according to the load distribution. Complex, heavy, prone to chimney rain, causing pollution to the atmospheric environment

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