Evaporative condenser is an efficient heat exchange equipment. It has the advantages of high heat transfer efficiency, energy saving, compact structure and convenient installation. The evaporation absorption capacity (latent heat) of equal quality water at room temperature is 115 times that of heat absorbed by water temperature rising by 5 ℃, which is the fundamental reason for water and power saving of evaporative condenser. It is widely used in large-scale chemical industry, medicine, steel, air conditioning, coal mine, nitrogen fertilizer and so on. It is also practiced in gas cooling, condensation and liquid cooling in ammonia synthesis, methanol synthesis, gas compression, distillation and waste heat recovery.
Working principle of evaporative condenser
The evaporation of some water is mainly used to take away the heat released by the condensation process of the gaseous refrigerant. The high-temperature gaseous refrigerant enters the coil from the refrigerant inlet at the upper part of the coil and exchanges heat with the spray water and air outside the coil. The gaseous refrigerant is gradually condensed into liquid and flows out from the refrigerant outlet at the lower part. The cooling water is sent to the spray system above the condensing coil by the water pump, and evenly sprayed on the outer surface of the condensing coil through the water distributor to form a thin water film. After the spray water and air absorb heat, the temperature rises, part of the water changes from liquid to gaseous, and a large amount of heat is taken away by the latent heat of evaporation. The rest of the water falls back to the lower collecting tank, and then sent to the spray system by the circulating water pump for recycling; The water droplets entrained in the air are blocked by the dehydrator and fall back to the water collection.
Structural characteristics of evaporative condenser
Countercurrent evaporative cooling: it is a kind of evaporative cooling that only uses the latent heat of water for heat exchange. It has large heat exchange area and is not easy to produce ice blockage and dirty blockage. It can operate in various environments, especially in the north. It has good effect and good effect without water in winter. The form of air inlet is countercurrent air inlet at the bottom, which alternates inversely with the spray water at the lower part to form saturated hot and humid air. The heat is discharged from the top fan. The water is recovered by the dehydrator with special structure and recycled in the water collecting tank. There is no heat exchange filler in the internal space, freeing up more space to increase the unit heat dissipation area of the coil. More compact structure and small land occupation. It is especially suitable for the situation that the outlet water temperature is close to the local wet bulb temperature.
Application fields of evaporative condenser
It is widely used in large-scale chemical industry, medicine, steel, air conditioning, coal mine, nitrogen fertilizer, gas cooling, condensation and liquid cooling in ammonia synthesis, methanol synthesis, gas compression, distillation and waste heat recovery.
In terms of structure, evaporative condenser is a combination of ordinary water-cooled condenser, cooling tower, water pump and pipeline connection of water system. It has the advantages of power saving, water saving and convenient installation. It has the characteristics of small floor area and convenient maintenance. However, there are essential differences in the principle of heat exchange. The water-cooled condenser uses the sensible heat of water to absorb the heat of refrigerant to achieve the purpose of refrigeration, while evaporative cooling uses the latent heat of water, that is, the evaporation of water at room temperature to absorb the heat to achieve the purpose of cooling. The heat absorbed by the evaporation of water of the same quality is 116 times that when the water temperature rises by 5 degrees. Therefore, when taking away the same heat, the water consumption of evaporative cooling is much lower than that of water-cooled condenser, which is also the fundamental reason for water and power saving of evaporative cooling.