Arrangement structure for improving safety of gravity flow water supply project and regulation and control method

Abstract

The invention provides an arrangement structure for improving the safety of a gravity flow water supply project and a regulation and control method. The arrangement structure comprises a gravity flow water supply main pipeline, wherein a large valve is arranged at the tail end of the gravity flow water supply main pipeline; the gravity flow water supply main pipeline is provided with a water supply branch pipeline at the upstream part of the large valve, and a small valve is arranged at the tail end of the water supply branch pipeline; and water outlet pools are arranged at the downstream parts of the large valve and the small valve. According to the arrangement structure for improving the safety of the gravity flow water supply project and the regulation and control method, the regulation and control mode is clear, the implementation difficulty and reliability are high, the stable operation of the gravity flow water supply project under different flows can be improved, the rising or falling of the water hammer pressure in the opening process and the closing process of the water supply system is improved, and the safety of the whole gravity flow water supply project is guaranteed.

Description

technical field [0001] The invention relates to an arrangement structure and a control method for improving the safety of a gravity flow water supply project, which is suitable for long-distance water supply projects, especially for high water head gravity flow water supply projects. Background technique [0002] In order to ensure water security, my country will further accelerate the construction of water networks. Optimize the pattern of water resource allocation, strengthen the response to water supply safety risks, and gradually establish a national water resource allocation and urban and rural water supply safety guarantee system that adjusts the seasons and seasons and coordinates deployment. The water supply mode of the water supply project is usually a gravity flow engineering system formed by water pump pressurized water supply and the use of head drop. There is an essential difference in regulation between pump pressurized water supply and gravity flow water supp...

AI Technical Summary

Problems solved by technology

For the gravity flow water supply system, the water supply capacity is mainly affected by the balance of the sum of the potential energy formed by the drop and the loss of the pipeline head loss and the loss under different developments of the valve. The adjustment ability is mainly reflected in the head loss within the valve adjustment range and the head loss of the pipeline. Weight relationship; In addition, most of the gravity flow water supply projects rely on the flow regulating valve at the end to adjust. In the past, small projects were used more often. The design concept still stays on the traditional "simple" understanding. The accident of outlet pipe burst usually has little impact. However, with the increase of the water supply distance and the increase of water supply volume, the system is not controlled or the control scheme is not properly selected, resulting in many "bizarre" pipe bursts or multiple damages to the end flow and pressure regulating valves of gravity flow water supply projects.

In addition, because the flow rate in the system is constantly changing, the opening of the flow regulating and pressure regulating valve often occurs when the flow is small, the valve vibrates and the cavitation is serious. Moreover, when the water supply stops running, when the valve is closed to a small opening, a small change in the opening will cause a sharp change in the flow, resulting in a large increase in the water hammer pressure, which is likely to induce an explosion. Manage the accident

At present, for the problems existing in gravity flow, the mode of setting regulating pools in the middle is usually adopted. In this mode, each level of regulating pools needs to be equipped with flow regulating and pressure regulating valves, which is expensive and inconvenient for operation scheduling.

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