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Design method for inflow channel of cyclone grit basin with trapezoid cross section

A technology of swirl grit chamber and design method, applied in the directions of calculation, instrument, geometric CAD, etc., can solve the problems affecting the sand removal efficiency of swirl chamber

Inactive Publication Date: 2016-07-20
CHONGQING UNIV
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Problems solved by technology

In the case of a small influent flow rate, the optimal flow rate of the sand removal channel cannot be reached, and in the case of a large influent flow rate, it often exceeds the optimal sand removal flow rate range. The fluctuations in these two aspects will affect the swirling flow. Sand removal efficiency of sand tank

Method used

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  • Design method for inflow channel of cyclone grit basin with trapezoid cross section
  • Design method for inflow channel of cyclone grit basin with trapezoid cross section
  • Design method for inflow channel of cyclone grit basin with trapezoid cross section

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[0027] A sewage plant, the average flow rate of the cyclone grit chamber is 25000m 3 / d, the coefficient of variation is calculated as 1.4, then the daily minimum flow Q min =25000 / 1.4=17860m 3 / d, the maximum daily flow Q max =25000×1.4=35000m 3 / d, rainstorm coefficient 1.6, handling capacity during rainstorm: Q max =25000×1.6=40000(m 3 / d). Therefore, the influent flow Q min =17860m 3 / d,Q max =40000m 3 / d is used as the design flow rate to design the water inlet channel of the cyclone grit chamber. According to the particle size range of the influent particles, the bulk density of the influent, the roughness of the influent channel and other factors, the optimum influent velocity range is determined as: 0.39m / s~0.94m / s.

[0028] Design specifications and requirements to be met:

[0029] In the "Quick Design Manual for Water Supply and Drainage (2) - Drainage Engineering", the flow velocity of the water inlet channel is stipulated as 0.6-0.9m / s at 40%-80% of the ...

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Abstract

The invention relates to a design method for an inflow channel of a cyclone grit basin with a trapezoid cross section. Each side wall of the channel has a certain gradient, namely, the whole channel has a trapezoid cross section. According to the design method, under appropriate parameters, the flow rate in the inflow channel is prevented from greatly changing following the change of inflow flux and is always within the optimal de-gritting flow scope of the cyclone grit basin. According to the design method, the cyclone grit basin can be always kept in a high-efficient de-gritting state in a large water quantity fluctuation scope, and the silt sedimentation at the bottom of the inflow channel can be effectively prevented. The reconstruction technique for a present inflow channel is simple according to the design method and is convenient and feasible.

Description

technical field [0001] The invention relates to the design of the inlet channel of the swirl grit chamber, in particular to the design of the inlet channel of the swirl grit chamber which can maintain the optimal flow rate of the sand removal inlet for the inlet channel of the swirl grit chamber when the inflow flow fluctuates greatly. Background technique [0002] For a sewage plant using a cyclone grit chamber, the inlet channel refers to the advection section that is usually set between the fine grid and the water inlet slope of the grit chamber in the design of the structure. Optimum flow rate flow regime. [0003] Studies have shown that maintaining a suitable flow rate in the inlet channel has an important impact on the sand removal efficiency of the cyclone grit chamber. In the ordinary rectangular inlet channel, the fluctuation of the influent flow rate due to the fluctuation of the water volume makes the sand removal efficiency of the cyclone grit chamber unstable....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 徐璇杜茂张齐艳赵德强吉芳英许晓毅龙俊吴田辉
Owner CHONGQING UNIV
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