[The role of heat exchanger] What is the main purpose of heat exchanger
A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Its main function is to ensure the specific temperature required by the process for the medium.
It can transfer heat between two or more fluids at different temperatures, so that the heat is transferred from the fluid with a higher temperature to the fluid with a lower temperature, so that the fluid temperature reaches the process specification. To meet the needs of process conditions, the heat exchanger is also one of the main equipment to improve energy utilization.
Heat exchangers are widely used, such as radiator fins for heating in daily life, condensers in steam turbine installations and oil coolers on aerospace rockets, etc., are heat exchangers. In petroleum, chemical, light industry, pharmaceutical, energy and other industrial production, heat exchangers are often used to heat low-temperature fluids or cool high-temperature fluids, vaporize liquids into vapors or condense vapors into liquids. A heat exchanger can be either a unit equipment, such as a heater, a cooler and a condenser, or a component of a certain process equipment, such as a heat exchanger in an ammonia synthesis tower. Heat exchanger is an important unit equipment in chemical production. According to statistics, the tonnage of heat exchanger accounts for about 20% of the entire process equipment, and some even as high as 30%. Its importance can be imagined.
Shell and tube heat exchangers are a large and varied product, and new wear-resistant, corrosion-resistant, high-strength materials are urgently needed. my country has made progress to varying degrees in the development of non-metallic materials such as stainless steel and copper alloy composite materials, aluminum-magnesium alloys and silicon carbide. Among them, titanium materials have developed rapidly. Titanium has good corrosion resistance to seawater, chlor-alkali, acetic acid, etc. If heat transfer is further strengthened, the effect will be better. Some manufacturing units have better mastered the processing and manufacturing technology of titanium materials. For the spraying of materials, my country has introduced production lines from abroad. Aluminum-magnesium alloy has high corrosion resistance and thermal conductivity, and its price is cheaper than titanium, so it should be noted. Remarkable achievements have been made in domestic research on improving heat exchanger performance, improving heat transfer efficiency, reducing heat transfer area, reducing pressure drop, and improving device thermal strength in terms of energy saving and efficiency enhancement. The large-scale use of heat exchangers effectively improves the utilization rate of energy, reduces the cost of enterprises and improves the efficiency.
