A material circulation system for dry desulfurization

Abstract

The invention provides a material circulating system for dry desulfurization. The material circulating system at least comprises an ash hopper, an aerating box, a chute and a pin pump. A discharging port of the ash hopper is connected with the top face of the aerating box and further provided with a gate valve. One side of the aerating box is connected with the chute through a material discharging pipe which is provided with a material circulating valve, and the other side of the aerating box is connected with the pin pump through an ash discharging pipe which is provided with an ash discharging pneumatic valve. The material discharging pipe is formed by connecting a transverse pipe and a vertical pipe, the transverse pipe is connected with the side wall of the aerating box, the vertical pipe is connected with the chute, a blockage removing hole is formed in the side wall of the vertical pipe, and the central line of the blockage removing hole coincides with the central line of the transverse pipe. The blockage removing hole is detachably provided with a sealing cover. Blockage removing can be completed online through the blockage removing hole, the maintenance time is shortened, and thus emission of atmospheric pollutants can be reduced to the maximum while the running rate of a desulfurization system is ensured.

Description

technical field [0001] The invention relates to the field of sintering flue gas desulfurization, in particular to a material circulation system for dry desulfurization. Background technique [0002] The dry desulfurization process is widely used in the field of flue gas desulfurization in iron and steel enterprises. The desulfurization agent slaked lime powder is recycled in the bag-ash hopper-absorption tower-bag system, and it reacts with sulfur dioxide in the flue gas to form desulfurization ash. [0003] One of the most important equipment in the dry desulfurization process is the material circulation system. The material in the ash hopper flows through the flapper valve to the aeration box, part of it is controlled by the material circulation valve to the chute for recirculation, and part of it is controlled by the ash discharge pneumatic valve to the bin pump. Among them, the opening of the material circulation valve can be adjusted, and the ash discharge valve can on...

AI Technical Summary

Problems solved by technology

In addition, due to the long accumulation time of the material in the ash hopper or the condensation of moisture in the flue gas after cooling down, the material will agglomerate in the material circulation pipeline and block the pipeline. When the blockage is serious, the material circulation system will fail and the entire desulfurization system will be shut down.

[0004] In addition, the flapper valve of the existing material circulation system adopts fixed guide support wheels, and the valve stem of the flapper valve often has dust falling on its thread during use, resulting in when the flapper valve is closed and opened, The resistance is large, and the problem of "stuck" of the flapper valve often occurs, the maintenance cycle is short, and the service life is shortened

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