A counter-distribution system and method for a natural draft cooling tower

By using a reverse water distribution system with a liquid level acquisition module and a PLC control module in a natural draft cooling tower, combined with a hydraulically driven flow-limiting gate, the air-water ratio was optimized, solving the problems of air-water mismatch and winter icing, and achieving efficient cooling tower transformation.

CN118980283BActive Publication Date: 2026-06-02XIAN THERMAL POWER RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN THERMAL POWER RES INST CO LTD
Filing Date
2024-09-18
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional natural draft cooling towers suffer from problems such as air-water ratio mismatch, air short-circuiting caused by waterless (weak water) zones in the outer area, and winter freezing issues. Existing reverse water distribution retrofit projects are complex, costly, and difficult to promote.

Method used

The system employs a liquid level acquisition module, a PLC control module, and a hydraulic drive module. It controls the flow rate of circulating cooling water in each area of ​​the cooling tower through a flow-limiting gate to achieve reverse water distribution. Combined with a radar level gauge and a hydraulically driven flow-limiting gate, it optimizes the air-to-water ratio.

Benefits of technology

It improves the air-water matching degree of the cooling tower, avoids air short circuits in the waterless area outside the tower, reduces the risk of icing in winter, reduces the cost of antifreeze measures, and is suitable for retrofitting existing large and medium-sized cooling towers.

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Abstract

The application discloses a natural ventilation cooling tower reverse water distribution system and method, the system comprises a liquid level acquisition module, a PLC control module, a hydraulic drive module and a gate action mechanism; the method comprises the following steps: the liquid level acquisition module uses a radar liquid level meter to collect the liquid level of each main water tank of the natural ventilation cooling tower in real time; the PLC control module remotely controls the hydraulic drive module, collects the liquid level of the main water tank in real time, adjusts the opening degree of the flow-limiting gate in real time according to a preset program, and realizes reverse water distribution of the natural ventilation cooling tower; the hydraulic drive module is controlled by the PLC control module, so that the real-time liquid level of the main water tank is maintained at a preset limit L lim ; the gate action mechanism blocks or controls the water distribution flow from the main water tank to the arc-shaped water distribution tank, so that the circulating cooling water flow of each region of the cooling tower is controlled. The application can effectively improve the air-water matching degree of the cooling tower, solve the problems of air short circuit and icing in winter caused by the waterless area of the cooling tower, and improve the cooling efficiency of the cooling tower.
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