An air cooler is a heat exchanger that uses air as a cooling medium to cool a warm stream to the required temperature. Referred to as air cooler. The principle is that the warm fluid in the tube passes the tube wall and fins to exchange heat with the air outside the tube and then reaches the cooling and condensing functions. The air cooler is mainly composed of a control, a bracket and a fan. Warm fluid moves inside the tube and air blows outside the control. Because the ventilation volume required for heat exchange is very large, the general air volume effect is not safe, so axial flow fans are mostly used. Air coolers can be used for cooling or condensing. They are widely used in the condensation of steam at the top of oil refining and petrochemical towers; the cooling of various reaction products of refrigeration dryers; Can save a lot of industrial water, reduce environmental pollution, and reduce infrastructure costs. Especially in water-scarce areas, replacing air-cooling with air-cooling can alleviate the opposition of insufficient water resources. However, the power consumption, noise and floor area are all large, and the cooling effect is greatly affected by climate change.
The control of air coolers includes heat transfer tubes, tube boxes, side beams and beams. It can be arranged in three basic ways: horizontal, vertical and inclined top (herringbone). In the meantime, the horizontal heat transfer area is large, the air is evenly distributed, and the heat transfer effect is good; when the inclined roof is arranged, the fan is installed in the herringbone center space, with a small footprint and compact structure. In order to offset the influence of the lower heat supply coefficient on the air side, generally, a finned tube is installed on the outer wall of the light pipe. Fin tubes are used as heat transfer tubes, which can expand the heat transfer area. The finned tubes are placed in layers, and the two ends are connected to the tube box by welding or expansion joints. The row of tubes is generally 3 to 8 rows. The regulation series measures up to 12 meters. The outer diameter of the light pipe is usually 25 mm and 38 mm, the height of the fins is generally 12-15 mm, and the control width is 100-3000 mm. The finned tube is the central component of the air cooler, and its method and data directly affect the equipment function.
The tube can be made of carbon steel, copper, aluminum, stainless steel, etc .; the fin information is determined according to the use environment and manufacturing process, and most of them are industrial pure aluminum. Copper is also used when the corrosion resistance is high or the manufacturing process is extraordinary Or stainless steel. The fins can be placed horizontally or vertically.
The basic methods of finned tubes are: nested sheet type, wound sheet type, rolled sheet type, welded sheet type, oval tube type, panel type, turbulent flow type, spoke type, and slotted type corrugated type. The structure of the tube box of the air cooler mainly includes a flange type, a pipe plug type and a regulating pipe type. The general flange type is used for low and medium pressure, the pipe plug type and the regulating pipe type are used for high pressure. One end of the tube box is fixed and the other end is not fixed, in order to control the thermal expansion.
The relevant content of Jiangsu cooler is introduced here.