System and method for regulating and controlling temperature of concrete dam

Abstract

The invention discloses a system and method for regulating and controlling the temperature of a concrete dam. The system comprises a temperature compensation source, a regulating and controlling medium, a medium replacing device, a reversible multi-connected output circulating pipeline, a temperature partition secondary regulating device, a flow regulating device and a control system. According tothe system and method for regulating and controlling the temperature of the concrete dam, through structural and functional design, corresponding components and control system development are adopted, multiple (more than two) regulation and control media with different temperatures and different flows can be provided by one set of device and output to a regulation and control pipe network arranged in the concrete dam, the flow and temperature of the media in each group of circulating pipelines are automatically adjusted in real time, and the flow direction can be automatically changed at anytime to meet the temperature control requirement of dam concrete.

Description

technical field [0001] The invention belongs to the field of water conservancy and hydropower project construction and the temperature control of concrete dam project operation, and specifically relates to a system and method for bidirectionally regulating the temperature of concrete dams in different regions, and is especially suitable for the construction period of concrete dams in cold regions and the operation period of dams. Temperature control can also be applied to temperature control of other construction concrete structures in cold regions such as dams, bridges, highways, airport runways, etc. Background technique [0002] Concrete has good compressive properties, but it cannot resist excessive tensile stress. Affected by factors such as its own structure, dam materials and environmental temperature changes, there is a large temperature difference between the inside and outside of the concrete dam body at different times, and the resulting relatively large Large str...

AI Technical Summary

Problems solved by technology

Although this method has a certain effect on reducing the maximum temperature, the process is relatively rough. The main reason is that most of the river water in the northwest region is melted by glaciers. Even in summer, the temperature is low, and there is a large gap between the low-temperature river water and the high-temperature concrete. Temperature difference

[0008] (2) After recognizing the above problems, the technicians improved the cooling water flow technology, such as the "Personalized Water Flow Method for Mass Concrete Temperature Control" disclosed in the authorized announcement number "CN101701495A", the traditional cooling water pipe was Optimization, cooling the inside of the dam concrete by changing the flow rate and changing the cooling water or river water, but there are only cooling measures, and there is no effective response to the impact of severe cold weather in winter; secondly, traditional water cooling mostly relies on manual operation of pumps Power supply, pipeline valves, temperature measurement, etc. require a lot of work, take a long time, and are also greatly affected by subjective factors. The waste of water resources caused by the discharge of water after a single cooling is also large

[0009] (3) In order to solve the shortcomings of traditional technologies, some water conservancy experts and scholars have successively proposed the concept of intelligent temperature control. The "Intelligent Temperature Control Method and System for Dam Concrete under Construction" disclosed in the authorized announcement number "CN102852145A" envisages a The temperature control method of the dam under construction, but it lacks the temperature control of the dam during the operation period

The authorized announcement number "ZL 201810950393.0" disclosed "intelligent temperature control dams and temperature control methods", which comprehensively and systematically explained the intelligent temperature control of concrete dams, but mainly focused on the control strategy and framework, and did not come up with specific details. Control equipment and systems, can not be put into engineering practice

[0010] (4) The traditional technology mainly considers the cooling water for the purpose of cooling in the early stage of pouring. Although the new temperature control concept mentions some assumptions about temperature rise and control in winter, it has not carried out in-depth research and made a clear definition of the control medium. In cold regions, when the temperature drops below zero in winter, the form, flow performance and heat transfer performance of the medium will change. For example, although the water used for cooling is the most widely used, its freezing point is only 0°C. In winter, it will freeze, block and damage the pipe due to frost heave. road; the freezing point and boiling point of antifreeze are both satisfied, but the specific heat capacity is lower than that of water, the cost is high, and it has certain toxicity. It is obviously unreasonable to directly discharge into the river after the traditional single cycle; and liquidity changes

[0011] (5) Secondly, none of the above technologies has solved the practical problem of regularly changing the direction of cooling water in the process of controlling the temperature of concrete by using water cooling technology, which must be considered in the temperature control design of the dam of

In the authorized announcement number "CN205276881U", a "cooling device with adjustable cooling water flow and a cooling system for mass concrete" is disclosed, relying on 2 outlet pipes, 2 inlet pipes, 4 valves and 2 diverters, 1 Pumps are used to change the direction of cooling water. The system has many components, complex structure, and many operating procedures, and it is still implemented by manual control.

It cannot meet the temperature control requirements of concrete dams

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