Temperature-pressure coordinated control system in volute and control method of temperature-pressure coordinated control system

Abstract

The invention relates to a temperature-pressure coordinated control system in a volute. The temperature-pressure coordinated control system comprises a temperature-maintaining system, a pressure-controlling system and a temperature-pressure-coordinating system, wherein a central control system comprises a temperature system control module, a pressure system control module, a temperature measurement input module, a pressure measurement input module, a temperature-pressure relation input module and a control precision input module and is connected with the temperature-maintaining system, the pressure-controlling system, a pressure sensor, a water temperature meter and a height automatic regulator of the pressure-maintaining system. According to the temperature-pressure coordinated control system disclosed by the invention, the central control system is used for carrying out dynamic coordination on temperature and pressure in the volute, and the pressure of water in the volute is rapidly regulated by a self-control lifting platform, thus the expansibility of the volute quickly meets design requirements during construction, the influences on the construction progress and the construction quality due to low regulation speed, difficult coordination and the like caused by single temperature regulation are improved, and foundation is laid for the promotion of the construction speed of a novel volute under the premise that the construction quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of hydropower engineering construction, and in particular relates to a temperature-pressure coordination control system inside a volute and a control method thereof. Background technique [0002] The water-filled pressure-holding volute is a new type of volute structure. When the unit is running at low water head, the volute alone bears the water pressure. When the unit is running at high water head, the volute and concrete jointly bear the force. The water-filled and pressure-holding volute not only reduces the strength requirements of the volute, but also reduces the exciting force on the plant to avoid damage to the plant structure. Therefore, the volute of water-filled and pressure-maintained concrete has been used for a long time. In the United States, Canada, Brazil, and Western Europe, water-filled and pressure-maintaining volutes are mostly used for large and medium-sized units. It is worth pointing out that h...

AI Technical Summary

Problems solved by technology

Although the temperature and pressure relationship curves that should be satisfied during the construction process of the volute can be obtained through analysis and calculation, due to the complex construction conditions, the variable construction environment, and the slow adjustment of the temperature of the water body in the volute, the water-filled and pressure-maintaining volute scheme is in the construction process. Due to the influence of temperature difference, the expansion of the volute will deviate, and then the pressure of the volute will deviate from the joint force distribution in the original design scheme.

The impact of these deviations will be exposed during the long-term operation of the unit, reducing the fatigue resistance of the volute, eventually leading to deformation of the volute and seat ring and damage to the plant structure

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