Clarify Usage Requirements
First of all, you need to clarify the use of the heat exchanger scene, media type, temperature range and pressure level and other key parameters. Different application scenarios have different performance requirements for heat exchangers, only clear demand, in order to target the selection of the appropriate models and specifications.
Stainless steel tube heat exchanger is suitable for many industries, mainly including chemical, petroleum, pharmaceutical, food, paper, electricity, gas and other industries.
Chemical industry
In the chemical industry, stainless steel tube heat exchanger is widely used in heat exchange equipment, able to withstand acid and alkali media, high temperature and high pressure to effectively transfer heat, improve production efficiency.
Petroleum industry
In petroleum processing, stainless steel tube heat exchanger is used in petroleum refining, cracking, distillation and other processes, the high temperature oil or petroleum products cooling.
Pharmaceutical industry
In the pharmaceutical process, stainless steel tube heat exchanger for thermal sterilization, thermal lubrication and other processes to ensure product quality and safety.
Food industry
In the food processing process, stainless steel tube heat exchanger is widely used in heat treatment, sterilization and other links to ensure food hygiene and safety.
Paper industry
In the pulp preparation and papermaking process, stainless steel tube heat exchanger is used for steam, water and other media heat transfer, improve production capacity and product quality.
Power industry
In the power plant boiler, turbine and other equipment, stainless steel tube heat exchanger is used to transfer heat, improve energy efficiency.
Gas industry
In the heating process of natural gas conditioning and liquefied natural gas, stainless steel tube heat exchanger is used to transfer heat and improve process efficiency.
Examine the quality of the material
The core of the stainless steel heat exchanger lies in its material. High-quality stainless steel material should have good corrosion resistance and mechanical strength, able to withstand the harsh working environment. When shopping, you should carefully check the product material certificate to ensure that the material meets the standard.
Shell and tube heat exchanger generally use stainless steel, titanium alloy and other materials.
Stainless steel
Stainless steel is one of the most commonly used materials in shell and tube heat exchangers. It has the advantages of high strength, corrosion resistance, easy processing, etc., can adapt to a variety of working environments. In addition, stainless steel also has good high temperature resistance, suitable for working under high temperature conditions. However, the price of stainless steel is relatively high, and sometimes it is necessary to carry out anti-corrosion treatment.
Titanium Alloy
Titanium alloy is a high-strength, lightweight, corrosion-resistant material, suitable for a variety of corrosive media heat transfer. Due to the high price of titanium alloy, it is generally applicable to special working conditions of the heat exchanger, such as desalination and other fields.
In general, the choice of materials for shell and tube heat exchanger needs to be based on the specific working environment and working conditions for comprehensive consideration. Different materials have different characteristics and scope of application, the selection of suitable materials can improve the efficiency and service life of the heat exchanger.
Focus on heat transfer efficiency
Heat exchange efficiency is an important indicator of heat exchanger performance. Efficient stainless steel heat exchanger can complete the heat exchange in a short period of time, improve productivity and reduce energy consumption. In the purchase, should pay attention to the product heat transfer efficiency data, and compare the performance of different products.
The heat transfer efficiency of stainless steel shell and tube heat exchanger is generally above 70%, and its heat transfer coefficient can reach 6000-8000W/m²-K.12 This kind of heat exchanger transfers heat energy from one medium to another through metal tubes, where one medium flows in the tubes and the other medium flows outside the tubes, and through the heat transfer between the pipe and the external medium to realize the temperature transfer of the two mediums.
Influencing factors of heat transfer efficiency
Fluid flow rate
Differences in hydraulic and gas flow rates affect heat transfer efficiency. Under laminar heat transfer conditions, the heat transfer efficiency is higher when the flow rate is lower, but too high a flow rate will lead to turbulence, increasing thermal resistance and reducing efficiency.
Fluid properties
The physical properties of the fluid (such as viscosity, density) and chemical properties (such as corrosion) will affect the heat transfer effect and equipment life.
Tube and shell design
Reasonable tube and shell design can increase the heat transfer area, reduce thermal resistance, thereby improving heat transfer efficiency.
Understanding the composition of the heat exchanger structure
Shell and tube heat exchanger is a kind of heat exchanger most widely used in chemical production, its structure is relatively simple, high heat transfer efficiency, strong adaptability (in high or low temperature, high pressure or low pressure conditions can be used).
The main structure of the shell and tube heat exchanger is in a cylindrical shell, set up many parallel arrangement of tubes composed of a bundle of composition.
The two ends of the shell and the end cap are equipped with flanges, using bolts to connect the end cap with the shell.
Shell and end cap are equipped with two kinds of media inlet and outlet small flange, in order to facilitate the corresponding pipeline connection.
Chemical production of commonly used shell and tube heat exchanger has a fixed tube and plate type, floating head type, U-shaped tube type and shell with thermal compensation role of several kinds.
Fixed tube and plate type shell and shell and tube heat exchanger's main structural composition: head; heat exchanger tube; folding plate; shell; support; tube plate.
Tube plate and shell ends form a non-removable fixed connection.
The two ends of the tube are connected to the tube plate by means of expansion welding. In order to change the flow direction of the medium between the tubes and to improve the heat exchange efficiency, a number of folding plates are set on the inner wall of the shell.
The end caps at both ends are connected with the shell in the form of flanges.
Inside the tube and between the tubes are flowing two different media.
In order to improve the heat transfer efficiency of the heat exchanger, sometimes set up a partition in the head to form a fluid distribution chamber, which constitutes the so-called double-tube shell and tube heat exchanger or four-way shell and tube heat exchanger.
Repair and maintenance methods
The long-term stable operation of stainless steel heat exchanger can not be separated from good maintenance and repair. In the purchase, should pay attention to the product structure design is easy to clean and maintenance, and manufacturers whether to provide perfect after-sales service and technical support.
1. Regular cleaning: regular cleaning of stainless steel sheel and tube heat exchanger is an important step to maintain its good operation. The cleaning process should pay attention to the selection of suitable detergents to ensure that the stainless steel material does not corrode.
2. Prevent corrosion: stainless steel sheel and tube heat exchanger is made of stainless steel, but corrosion may still occur after a long time of use. Therefore, it should be regularly checked whether there are signs of corrosion, and take timely preventive measures.
3. Check piping connections: regularly check whether the piping connections are loose, leakage and other problems, to avoid the failure of piping connections lead to stainless steel sheel and tube heat exchanger can not operate normally.
4. Clean the heat transfer surface: dirt on the heat transfer surface will affect the heat transfer efficiency of the heat exchanger, so regular cleaning is very important. Use the appropriate cleaning agents and tools, pay attention to avoid excessive scrubbing or the use of corrosive cleaning agents.
5. Check the fluid quality: Checking the fluid quality is the key to keep the stainless steel sheel and tube heat exchanger running well. Regularly check the fluid for particulate contaminants, sediments or other impurities, and take timely measures to clean or replace the fluid.
6. Regularly check the temperature and pressure gauges: Regularly check the temperature and pressure gauges of the heat exchanger to ensure their accurate readings. If necessary, calibrate or replace them in a timely manner.
