In which system is the auxiliary mechanical ventilation cooling tower located in the power plant?

Characteristics and design points of hyperbolic reinforced concrete thin-shell natural ventilation cooling tower (:) Nine-room researcher Li Zanpei Beer/hyperbolic reinforced concrete thin-shell natural ventilation cooling tower (hereinafter referred to as cooling tower) is a heavy structure in the huge circulating cooling water supply system of thermal power plants, nuclear power plants and nuclear reactors. Cooling towers are particularly indispensable supporting facilities for the construction of the above-mentioned factories in areas with poor water resources. With the gradual diversification of design tasks, the design tasks of cooling towers in our hospital are increasing year by year. In order to meet the needs of work reference, we selected some structural specialties involved in the design of cooling tower 1 and some problems that should be paid attention to in the design, which are divided into two parts: the first part introduces the characteristics of the main structural components of hyperbolic cooling tower; The second part introduces the mechanical calculation of the main structural members of hyperbolic cooling tower. First, a brief history of cooling towers. Reinforced concrete cooling towers have been used for several decades. The first suggestion of using reinforced concrete shell in cooling tower in the world was put forward in the Netherlands in 19 10. The engineering practice of the first hyperbolic cooling tower was 1938 in Germany and 1949 in Hungary. 1958 The first hyperbolic cooling tower with a height exceeding 100 meters appeared in the United States. 1966 The first hyperbolic cooling tower built in East Germany with sliding mode technology was successful. At present, one of the largest cooling towers built in the world is the cooling tower of Dier Nuclear Power Station in Belgium, with a height of 167.5, a bottom diameter of 142 and a top diameter of 80. The first hyperbolic cooling tower built by ourselves was built in Liaoyuan Power Plant in 1952. So far, about 200 similar cooling towers of different sizes have been built in China. 40 Second, the main structural characteristics of the cooling tower Hyperbolic cooling tower is mainly composed of three parts: tower body, sprinkler and ancillary facilities. The tower body mainly includes water collecting basin, tower foundation, tower column, ring beam under the tower, tower body and tower body. The water spraying device is mainly composed of water distribution tank, support frame, water splashing device, water spraying filler, water eliminator, etc. Accessory facilities mainly include manhole, ladder leading to shower, tower top ladder, tower top walkway railing, lightning protection facilities, tower top obstacle flashlight, etc ... All components of the cooling tower body make the water distribution tank and the support frame of shower become the main components of the structure. The characteristics of each component and the points that should be paid attention to in design are explained in the following paragraphs respectively. After the water collecting tank is cooled by the shower, it is +0 .5438. Stored in the water collecting tank. The structural forms of the water collecting tank are mainly divided into two types: parallel type and separated type. The bottom plate of the water collecting basin is reinforced concrete slab, and the thickness should not be less than 150. Kang board is generally used as the foundation of sprinkler. When the frame column of the sprinkler is supported on the bottom plate, the upper layer of the bottom plate should be provided with structural reinforcement. Columns can be left directly on the bottom plate or supported on a single foundation through the bottom plate. It should be determined according to the distance between columns and the weight of watering filler. Asphalt waterproof layer should be set between the bottom plate and the concrete cushion. Radial expansion joints shall be set on the bottom plate of the water collection tank. Settlement joints should be set between the bottom plate and structures with large load difference such as tower foundation and water distribution well. Expansion joints and settlement joints shall be waterproof with waterstops or flexible waterproof fillers. The inner wall of the water collecting tank should be waterproof. The cooling tower foundation is mostly ring-shaped or arranged along the ring direction on the horizontal plane. All the load is transferred under the tower column. The cutting is finally transmitted to the foundation through the foundation. Because the internal force of tower is very sensitive to uneven settlement, the correct selection of foundation is very important. According to the engineering practice and regulations: ① For large and medium-sized towers, when the natural foundation is good, the annular plate foundation should be adopted; ② For medium and small towers, the inverted foundation should be adopted when the natural foundation is poor; ③ When the natural foundation is rock, independent foundation should be adopted. These three principles are based on the following. It can better adapt to the deformation of foundation, and it is recommended to use it when the foundation conditions are poor. For large and medium-sized towers, due to the large size of inlet and outlet pipes (trenches), the rigidity of foundation ring will be greatly weakened by inverting the corresponding holes on the side wall of foundation, thus reducing its advantages. At this time, it is more appropriate to use the ring plate foundation. Under the condition of rock foundation, it is obvious that using a single foundation can not only meet the requirements of water pipe crossing, but also obtain huge economic benefits.