Combined system arranged on pressure-free concealed culvert and used for regulating and controlling suspension mass separation mode according to flow

Abstract

The invention discloses a combined system arranged on a pressure-free buried culvert and used for regulating and controlling the suspension mass separation mode according to flow. The combined systemcomprises an inlet section, an outlet section and a conical water tank section; a diffusion section is arranged at the inlet section which is connected with the part, at the inlet, of the pressure-free buried duct, the rear of diffusion section is then connected with a water inlet gate and the flow through gate, the rear of the water inlet gate is connected with a water inlet hole, and an flow through channel is connected with the rear of the flow through gate; an overflow tank is arranged at the outlet section, the overflow tank and the flow through channel are arranged side by side, a throttling gate is arranged at the rears of the overflow tank and the flow through channel, a gradually-retracting section is arranged at the rear of the throttling gate, and the gradually-retracting section is connected to the part, at the outlet, of the pressure-free buried duct; and the conical water tank section is arranged between the water inlet hole and the overflow tank in a distributed mode, the conical water tank section comprises a conical water pool, wherein a suspension mass discharge bottom hole is formed in the bottom of the conical water pool, a suspension discharge gallery is connected with the suspension discharge bottom hole, the water inlet hole communicates with the conical water tank, and the conical water tank communicates with the overflow tank through an overflow weir. According to the combined system, two parts in the combined system are selected and used according to the flow through amount of the pressure-free buried culvert so that the separation of the suspension mass can be carried out on water flow when the flow amount is large, the water flow can flow through when the flow amount is small, and the operation of a unit can be guaranteed.

Description

technical field [0001] The invention relates to a suspended matter separation system in water conservancy and hydropower projects, in particular to a combined system arranged on a non-pressurized culvert and controlling a suspended matter separation method according to the flow rate. Background technique [0002] Generally, diversion-type hydropower stations built on mountainous rivers or silt-rich rivers often stipulate the maximum allowable particle size and content of suspended matter entering the turbine in order to prevent wear and tear of the turbine. When the water flow for power generation cannot meet the requirements, a suspended mass separation pool structure must be installed. The working principle of the ordinary suspended matter separation tank structure is to reduce the flow velocity of the water flow and reduce the sand-carrying capacity of the water flow by increasing the cross-section of the water, so that the suspended matter larger than the designed minimu...

AI Technical Summary

Problems solved by technology

If it is arranged in a conventional way: 1. A large number of high slopes will be generated, which will bring more safety hazards. At the same time, the support of the slopes will also cost a lot of investment; 2. To build a large-scale pool structure, occupying an area of time consuming, large investment

In addition, there are many inconveniences in the operation of separately arranging the structure of the suspended mass separation pool

First of all, according to the size of the structure of the suspended mass separation tank, the optimal working flow rate is basically fixed, with only small fluctuations: when it is in the flood season, the flow rate from the upstream exceeds the optimal working flow rate of the suspended mass separation tank, which will greatly increase the flow rate. Affect the working effect of the pool, and even cause flooding in serious cases; on the contrary, when it is in the non-flood season, the inflow flow is small, and it cannot meet the working flow range of the separation pool, and the water consumption of the water flow through the separation pool will increase greatly, causing serious problems. Economic losses

Secondly, when the content of suspended solids in the incoming flow is low, there is no need for suspended solids separation, and the water flow through the suspended solids separation tank will instead cause unnecessary water loss and reduce the power generation efficiency of the unit

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