Method for predicting and optimizing abrasion of valve in pneumatic conveying system

Abstract

The invention discloses a method for predicting and optimizing abrasion of a valve in a pneumatic conveying system. Establishing a valve pipeline model, and extracting a gas domain to obtain a flow channel model; meshing the flow channel model, and dividing the flow channel model into a plurality of sets of flow channel mesh models with different mesh numbers; calculating a flow coefficient of a flow channel in the model, comparing flow coefficient results of the flow channel mesh models, and selecting one set of flow channel mesh model from the flow coefficient results; flow field analysis isconducted on the flow channel grid model, a speed cloud chart, a particle distribution cloud chart and an abrasion cloud chart are obtained respectively, and the flowing situation of gas and solid particles in the valve and the abrasion situation caused to the interior of the valve are analyzed. According to the method, the two-phase flow state of gas and solid particles in the valve can be simulated, the abrasion of the particles to the valve in the two-phase flow state is predicted, and the structure of the valve is optimally designed according to the abrasion condition of the valve.

Description

technical field [0001] The invention belongs to the technical field of valves and relates to a method for predicting and optimizing valve wear in a pneumatic conveying system, in particular to research on wear of valves in the field of dilute-phase pneumatic conveying. Background technique [0002] Pneumatic conveying is a conveying method that uses airflow at a certain pressure and a certain speed to convey dry powder and granular materials in pipelines. It widely exists in various industrial fields, such as the transportation of fly ash and pulverized coal in power plants, the transportation of fertilizer granules in the chemical industry, the transportation of flour in the food industry, the transportation of metal powder in foundries, and the transportation of pharmaceutical granules in pharmaceutical factories, etc. . In dilute phase transportation, the gas velocity is generally 10-40m / s, the solid-gas ratio is generally less than 5, and solid particles move in the pip...

AI Technical Summary

Problems solved by technology

The valve is a kind of gas control device in the pneumatic conveying pipeline system. During the use of the valve, the existence of solid particles will cause two problems: one is the problem of two-phase flow; the other is the problem of particle erosion wear

During the opening process of the valve, due to the high pressure in front of the valve, the velocity of the gas is high, and the medium in front of the valve is a fluidized gas-solid two-phase mixture, and there is a large amount of particle erosion during the transient process of opening.

[0003] Existing valve wear prediction and optimization usually use experimental methods for actual measurement, but the experimental period of this actual measurement method is very long, the time cost is very high, and it will also consume a lot of manpower, material and financial resources. There are many uncertain factors, which will have a great impact on the experimental results of wear, resulting in inaccurate experimental results.

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