Elbow used for pneumatic conveying of powdery and granular materials

Abstract

The invention provides an elbow used for pneumatic conveying of powdery and granular materials. The elbow used for pneumatic conveying of powdery and granular materials comprises a cylindrical inner cavity, a feeding pipe and a discharging pipe, wherein the cylindrical inner cavity is formed in the elbow used for pneumatic conveying of powdery and granular materials; both the feeding pipe and the discharging pipe communicate with the cylindrical inner cavity, and the corresponding central angles of the axis of the feeding pipe and the axis of the discharging pipe on the cylindrical inner cavity are obtuse angles; and the axis of the feeding pipe is eccentric towards the side, away from the discharging pipe, relative to the rotation center of the cylindrical inner cavity, and the axis of the discharging pipe is eccentric towards the side, away from the feeding pipe, relative to the rotation center of the cylindrical inner cavity. The elbow used for pneumatic conveying of powdery and granular materials has the beneficial effects that abrasion of gas-solid mixtures to the elbow is reduced, and the service life of the elbow is prolonged; the elbow is convenient to mount or replace; unblocking and checking of the internal abrasion condition of the elbow can be conducted without dismounting the elbow; and the probability of breakage of pulverized coal particles in the position of the elbow is lowered.

Description

technical field [0001] The invention relates to the field of material conveying elbows, in particular to an elbow for pneumatic conveying of powder and granular materials. Background technique [0002] In the coal gasification process, powder and granular materials such as coal powder or quartz sand need to be transported by pneumatic conveying. During the pneumatic conveying process, the gas-solid mixture formed by coal powder or quartz sand and conveying gas flows at high speed in the pipeline. When the flow direction is changed, the gas-solid mixture will cause severe abrasion to the elbow. Therefore, in the pulverized coal or quartz sand pneumatic conveying system, the pipe elbow is most severely eroded, and it is easy to be worn through to cause leakage of coal powder or quartz sand, resulting in a short service life of the elbow and requiring frequent replacement. The following problems exist in the elbows used in the gas-solid two-phase flow pipelines of the existin...

AI Technical Summary

Problems solved by technology

Therefore, in the pulverized coal or quartz sand pneumatic conveying system, the pipe elbow has the most serious abrasion, and it is easy to be worn through to cause the leakage of coal powder or quartz sand, resulting in a short service life of the elbow, which needs to be replaced frequently

The following problems exist in the elbows used in the gas-solid two-phase flow pipelines of the existing pneumatic conveying system: 1. With butt-welding flanges, when installing or replacing the elbows, it is easy to cause the bolt holes in the flange of the elbow and the bolt holes in the pipeline The azimuth deviation is too large to be installed; 2. When conveying pulverized coal or quartz sand, the elbow of the gas-solid mixture pipeline is prone to blockage, and the existing elbow needs to be disassembled for cleaning when the material is blocked, which takes time and effort. Larger, in severe cases, the downstream process cannot be operated; 3. When the existing elbow is overhauled, it is necessary to disassemble the elbow and detect the internal wear of the elbow, and the maintenance work is cumbersome

4. When the existing elbow is transporting pulverized coal materials, the gas-solid mixture collides at the elbow, causing some pulverized coal particles to break, resulting in a change in the particle size distribution of pulverized coal, which cannot meet the particle size requirements of the downstream process for the material

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