Calculation method for indirect air cooling system design based on thermal resistance characteristics of components
A technology of air cooling system and resistance characteristics, applied in the field of power station cooling system, can solve the problems of unreliable on-site measurement data, no structural parameters, lack of calculation formulas, etc.
Active Publication Date: 2021-05-18
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology
Due to uncontrollable factors such as the environment and the influence of the structural parameters of each component of the air cooling system, the on-site measurement data is unreliable, and there is a lack of systematic and accurate calculation formulas
In addition, as the scale of the unit becomes larger and larger, the size of the air-cooling tower is also increasing. It is a super-large indirect air-cooling tower. There is no physical tower to measure, and there are no structural parameters that can be referred to, especially the indirect air-cooling tower of a nuclear power plant. , for the current third-generation units, even if one machine and two towers are used, it is still a super large cooling tower
According to the current design method, it cannot meet the needs of the actual project, and will bring great uncertainty to the implementation of the actual project.
Method used
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Embodiment
[0089] In this embodiment, the physical model of each component is first established; the physical model of the component established in this embodiment includes the physical models of the cooling triangle, the X column and the air cooling tower.
[0090] In this embodiment, the finned tube bundle type is selected for the air-cooled radiator, and only one fin is considered during physical modeling. image 3 It is the physical model of the cooling triangle in this embodiment. Every 2 cooling columns and 1 louver form a cooling triangle. The cooling triangle is in the shape of a pointed roof. Two radiators are arranged symmetrically on the two slopes of the pointed roof. In the figure, D1, D2 and D3 represent the inlet section, cooling triangle section and outlet section of the cooling triangle respectively, and A1 and B1 represent the wind speed inlet and pressure outlet of the cooling triangle. Figure 4 with Figure 5 They are the physical model of the X column and the physi...
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The invention discloses an indirect air-cooling system design and calculation method based on the thermal resistance characteristics of components. The method is based on CFD numerical simulation, and obtains the flow and heat transfer characteristics of each component of the indirect air-cooling system through a large number of numerical experiments, and fits them into Resistance and heat transfer coefficient correlation. On this basis, through the set radiator head wind speed and the number of radiator cooling triangles and other parameters, use the air cooling tower draft, indirect air cooling system resistance formula and thermal calculation to obtain the indirect air cooling system draft, total resistance and air cooling tower output Tower water temperature; through multiple iterative calculations, the air-cooling radiator and the air-cooling tower scale that satisfy the aerodynamic balance and energy conservation are obtained, and finally the design scheme of the indirect air-cooling system is obtained. This method can predict the relevant parameters of the air-cooling radiator and cooling tower, and provides a simple and feasible design scheme of the indirect air-cooling system, which provides a theoretical basis for the implementation of the actual project, and better meets the needs of the actual project.
Description
technical field [0001] The invention relates to the field of power station cooling systems, in particular to an indirect air cooling system design and calculation method based on the thermal resistance characteristics of components. Background technique [0002] Indirect air cooling, as one of the cooling forms of power stations, has achieved rapid development in my country in recent years. The indirect air-cooling system is mainly composed of an air-cooling radiator and an air-cooling tower. The suction force generated by the density difference between the inside and outside of the air-cooling tower is used for natural ventilation to achieve the purpose of cooling circulating water. [0003] For indirect air-cooling systems, in order to achieve the purpose of circulating water cooling, a certain scale of air-cooling radiators and air-cooling towers are usually required to meet the aerodynamic balance and heat transfer balance in the air-cooling tower, that is, the air-cooli...
Claims
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IPC IPC(8): G06F30/20G06F119/08
CPCG06F30/367G06F2119/08
Inventor 张荣勇李海珠白玮王东海王芳杨嘉
Owner CHINA NUCLEAR POWER ENG CO LTD