Circulating fluid bed flue gas desulfurization tower

Abstract

The invention relates to the technology field of combustion equipment, and discloses a stack gas desulfurization tower of a circulating fluid bed, which is used for smoke gas purification. The stack gas desulfurization tower comprises a purified smoke gas outlet, an atomizing water jet apparatus, recycling ash nozzles, a desulfurizer inlet, and a smoke gas inlet which are arranged on a tower body. The stack gas desulfurization tower is characterized in that functional air nozzles are arranged on the tower body and positioned under recycling ash nozzles; at least a wind-pressure desulfurizer jet apparatus is arranged on the tower body and positioned under the functional air nozzles; a plurality of Venturi nozzles are arranged inside a Venturi throat in the tower body; the wind-pressure desulfurizer jet apparatus has the structure that an air inlet pipe is provided, the desulfurizer inlet is arranged on the air inlet pipe, and a diffuser nozzle is arranged on the head end of the air inlet pipe, wherein, the head end of the air inlet pipe extends into the tower body; the recycling ash nozzles and the functional air nozzles are both a plurality of nozzles. The stack gas desulfurization tower has the advantages of reasonable structure, low investment, low running cost, reliable running, high efficiency, wide application range, etc.

Description

technical field [0001] The invention relates to the technical field of combustion equipment, in particular to a circulating fluidized bed flue gas desulfurization tower for flue gas purification. Background technique [0002] The problem of sulfur dioxide gas pollution caused by combustion has always been the focus of governance in countries all over the world. At present, the limestone / gypsum wet process is mainly used for flue gas desulfurization in foreign and domestic large-scale thermal power plants. Although the wet process is relatively mature and has high desulfurization efficiency, it has complex systems, large investment, large floor area, and high water consumption. Higher running costs etc. The circulating fluidized bed flue gas desulfurization device has the advantages of low investment, low operating cost, and high efficiency. Its application prospect is very broad, and it has been used more and more, and its research has become more and more in-depth. At hom...

AI Technical Summary

Problems solved by technology

The above existing technologies generally have the following defects: First, after the desulfurizer and recirculated ash as solid particles enter the desulfurization tower, the ideal effect is that the solid particles are rapidly fluidized and have a uniformly distributed particle flow after entering the tower. field, make the flue gas fully contact with the desulfurizer particles, accelerate the reaction, improve the utilization rate of the desulfurizer, and prevent ash from falling at the bottom of the tower

In the prior art, one desulfurizer inlet is generally used for desulfurization agent entry, and the recirculation ash is entered by mechanical transportation or air chute, so that the solid particles cannot be quickly dispersed and gasified by the flue gas after entering the tower, resulting in the flow field distribution of particles in the tower. Uneven, which undoubtedly weakens the mixing of particles and flue gas, reduces the utilization rate of desulfurization agent, and affects the improvement of desulfurization efficiency; at the same time, it is easy to make particles agglomerate, and ash falls at the bottom of the desulfurization tower. With the increase of unit capacity, the density of solid particles This phenomenon appears to be more serious as the amount of

During the operation, the desulfurization efficiency is low, and the ash at the bottom of the tower is serious, which affects the stable operation of the system.

Second, the upper part of the desulfurization tower adopts an internal circulation device. The purpose is to increase the internal circulation and reduce the external ash circulation.

Thirdly, the nozzles are arranged in a concentrated manner, resulting in too high humidity in the water spray area, which may easily cause the wet wall to be stained with dust; fourthly, the desulfurization agent still adopts the slurry delivery method, which makes the pipes and nozzles easy to block and the atomization effect is not easy Guaranteed, it is easy to agglomerate and stick to the wall when in contact with the ash in the tower

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