Multi-stage mixed flow primary air pipe anti-blocking system

Abstract

The invention relates to a multi-stage mixed flow primary air pipe anti-blocking system. According to the technical scheme, the multi-stage mixed flow primary air pipe anti-blocking system comprises aprimary air pipe; the primary air pipe is of a round hollow tubular structure formed by sequentially connecting a primary air pipe horizontal section, a bend transition section and a primary air pipevertical section together; and a first-stage swirler, a second-stage flow mixer and a third-stage flow mixer are sequentially arranged in the primary air pipe horizontal section in the pulverized coal conveying direction, a vertically-through pulverized coal deposit collecting opening is formed in the bottom of the junction of the primary air pipe horizontal section and the bend transition section, and a pulverized coal collecting device stretching downwards is connected to the pulverized coal deposit collecting opening. As the first-stage flow mixer, the second-stage flow mixer and the third-stage flow mixer are arranged in the primary air pipe horizontal section, primary air and pulverized coal are continuously subjected to rotational flow mixing, it is guaranteed that the pulverized coal does not sink or pile up to the maximum degree, finally the pulverized coal is fed into the primary air pipe vertical section through the bend transition section, and the pulverized coal collectingdevice is arranged on the junction of the primary air pipe horizontal section and the bend transition section to collect pulverized coal deposits.

Description

technical field [0001] The invention relates to a multistage mixed flow primary air duct anti-blocking system. Background technique [0002] Among the coal-fired boilers, most of the boilers are pulverized coal boilers at present, which require hot air to transport the pulverized coal. The pulverizing system includes a positive pressing pulverization system and a negative pressing pulverization system, which is mainly aimed at boilers with four-corner tangential operation. When hot air is used for pulverized coal transportation, due to the long powder pipe, especially in the horizontal section, due to the action of gravity, the coarse coal powder will be deposited in the lower part of the powder pipe to flow. At a high place, when it is about to enter the furnace for combustion, there will be a vertical rising section. At this position, the coarse coal powder deposited in the lower part is relatively heavy, and it is easy to deposit at the lower elbow of the vertical section...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide a multi-stage mixed flow primary air duct anti-blocking system, which can effectively solve the problem of primary air duct blocked by powder accumulation

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