Working principle and characteristics of adjustable shrinkage holes in pulverized coal pipelines

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The important part of the adjustable shrinkage cavity is the wear-resistant core plate. The company uses rare earth wear-resistant steel core plates and ceramic wear-resistant core plates. They have been used in power plant powder feeding pipelines for a long time and have the advantages of no powder clogging, no jamming, no powder leakage, easy installation, flexible adjustment, etc. 1. The use of double-core adjustable shrinkage holes : The double-core adjustable shrinkage hole is mainly used in the powder feeding pipeline of coal-fired boilers to adjust the balance of the air pressure of pulverized coal in the pipeline to ensure the combustion stability of the boiler. 2. Working principle of double-core adjustable shrinkage hole : The double-core adjustable shrink hole is a new type of regulating valve that is improved on the original single-core adjustable shrink hole to adjust the flow rate of the air-powder mixture in the powder conveying pipeline. It will use the rotational torque on the handwheel and the up and down transmission of the transmission rod to turn it into upward and downward motion forces, driving the upper and lower valve plates to operate in reverse to achieve the purpose of adjusting the flow cross-sectional area of ​​the pipeline. 3. Performance characteristics of dual-core adjustable shrinkage holes: 1. The double-core plate and the wear-resistant channel cylinder are made of rare earth wear-resistant steel, which has excellent wear resistance, good sealing performance, flexible startup, good adjustment performance, fine craftsmanship, and beautiful appearance. 2. The air-powder mixed fluid in the pipeline is always in the center of the pipeline. Since the double-core plate with adjustable shrinkage holes reciprocates outward from the center of the pipeline at the same time, this fundamentally eliminates the defect of eccentric flow, reduces flow resistance and eccentric tube wear, thereby extending the service life of the powder conveying pipeline. 3. The double-core adjustable shrinkage cavity is designed with a sealing device. Coal powder can never penetrate into the shrinkage cavity, so it can always maintain a flexible opening and closing state and has a long service life. 4. Compact structure and small installation space. 5. The operating torque is small, the switch is flexible and there is no jamming phenomenon. The inner diameter of the double-core adjustable shrinkage hole is DN300-DN600. The related materials and processes can be customized according to the needs of the site environment.