A Method of Airflow Uniform Distribution Based on Numerical Calculation of Flow Field

Abstract

The invention discloses an airflow uniform distribution method based on numerical calculation of the flow field. A trapezoidal honeycomb structure diversion grid is arranged in a conventional bell mouth, and the airflow passes through the diversion grid from a narrower section channel to a wide section channel, combined with the flow field Numerical simulation of the flow field distribution of the air flow through the diversion grid, and obtain the flow distribution of each grid, and then obtain the deviation of the air flow of each grid channel from the average flow, and increase or decrease according to the size of the deviation For the entrance cross-sectional area of ​​the trapezoidal grid, the numerical simulation calculation of the flow field is carried out again. After several repetitions, the gas flow rate of each grid can be close to the same, so that the flow field of the wide-section channel can be evenly distributed. Utilizing the air flow uniform distribution method based on the numerical calculation of the flow field described in the present invention can reduce the flow velocity deviation on the target section to a very low range, and meet the needs of some engineering occasions that require high flow field uniformity. The method is effective and feasible.

Description

technical field [0001] The invention relates to a method for uniform distribution of air flow based on flow field numerical calculation, and relates to the technical fields of energy, environmental protection, chemical industry and the like. Background technique [0002] When the cross-sectional area of ​​the air flow channel changes, it is easy to cause uneven air distribution, such as mist eliminators, wet electrostatic precipitators, etc. Drastic changes occur, resulting in uneven distribution of air flow in the downstream section of the bell mouth. At present, some newly developed flue gas purification equipment such as wet desulfurization demisters and wet electrostatic precipitators have very high requirements for the uniformity of airflow distribution. The percentage of the entire channel section is required to reach more than 85%, and the uniformity of the flow field will significantly affect the efficiency of capturing PM2.5. [0003] In the prior art, the traditi...

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Problems solved by technology

[0002] When the cross-sectional area of ​​the air flow channel changes, it is easy to cause uneven air distribution, such as mist eliminators, wet electrostatic precipitators, etc. Drastic changes occur, resulting in uneven distribution of air flow in the downstream section of the bell mouth

At present, some newly developed flue gas purification equipment such as wet desulfurization demisters and wet electrostatic precipitators have very high requirements for the uniformity of airflow distribution. The percentage of the entire channel section is required to reach more than 85%, and the uniformity of the flow field will significantly affect the efficiency of capturing PM2.5

[0003] In the prior art, the traditional adjustment method is usually adopted, that is, installing a deflector or an air distribution plate in the bell mouth or at the outlet of the bell mouth to adjust the uniformity of the air flow downstream of the bell mouth, although it can play a role in the uniformity of the air flow. It has a certain adjustment effect, but it cannot achieve the ideal air distribution effect, and cannot meet the requirements of some newly developed new equipment for controlling PM2.5 emissions.

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