The shell and tube heat exchanger is also known as the tubular heat exchanger. It is an interwall heat exchanger with the wall surface of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a relatively simple structure, reliable operation, and can be made of various structural materials (mainly metal materials). It can be used under high temperature and high pressure conditions and is currently the most widely used type.
Structure
The shell and tube heat exchanger is composed of components such as the shell, heat transfer tube bundle, tube sheet, baffle plate (baffle) and tube box. The shell is mostly cylindrical in shape, with tube bundles installed inside, and both ends of the tube bundles are fixed on the tube sheet. The two fluids involved in heat exchange, hot and cold, one flows inside the tube and is called the tube-side fluid. Another type flows outside the tube and is called the shell-side fluid. To enhance the heat transfer coefficient of the fluid outside the tube, several baffles are usually installed inside the shell. Baffles can increase the fluid velocity in the shell side, forcing the fluid to pass laterally through the tube bundle multiple times along the prescribed distance and enhancing the degree of fluid turbulence. The heat exchange tubes can be arranged in equilateral triangles or squares on the tube sheet. The equilateral triangular arrangement is relatively compact, the turbulence degree of the fluid outside the tube is high, and the heat transfer coefficient is large. The square arrangement makes it convenient to clean the outside of the tube and is suitable for fluids that are prone to scaling.
Each time a fluid passes through a tube bundle is called a tube pass. Each time it passes through the shell is called a shell pass. The illustration shows the simplest single-shell and single-tube pass heat exchanger, which is simply referred to as the 1-1 type heat exchanger. To increase the fluid velocity inside the pipe, partitions can be set up in the pipe boxes at both ends to evenly divide all the pipes into several groups. In this way, the fluid passes through only part of the tubes each time and thus makes multiple round trips in the tube bundle. This is called multi-tube pass. Similarly, to increase the flow rate outside the tube, longitudinal baffles can also be installed inside the shell to force the fluid to pass through the shell space multiple times, which is called multiple shell passes. Multi-pass and multi-shell pass can be used in combination
Type
Due to the different temperatures of the fluids inside and outside the tubes in a shell and tube heat exchanger, the temperatures of the shell and the tube bundle of the heat exchanger are also different. If there is a significant temperature difference between the two, a large thermal stress will be generated inside the heat exchanger, causing the tubes to bend, break, or be pulled off the tube sheet. Therefore, when the temperature difference between the tube bundle and the shell exceeds 50ºC, appropriate compensation measures need to be taken to eliminate or reduce thermal stress. According to the compensation measures adopted, shell and tube heat exchangers can be mainly classified into the following types:
The tube sheets at both ends of the fixed tube sheet heat exchanger are integrated with the shell as a whole. It has a simple structure, but it is only suitable for heat exchange operations when the temperature difference between the cold and hot fluids is not large and mechanical cleaning of the shell side is not required. When the temperature difference is slightly large and the shell-side pressure is not too high, elastic compensating rings can be installed on the shell to reduce thermal stress.
2. The tube sheet at one end of the tube bundle in the floating head heat exchanger can float freely, completely eliminating thermal stress. Moreover, the entire tube bundle can be withdrawn from the shell, facilitating mechanical cleaning and maintenance. Floating head heat exchangers are widely used, but they have a relatively complex structure and a high cost.
3. In U-tube heat exchangers, each heat exchange tube is bent into a U shape, with both ends fixed in the upper and lower sections of the same tube sheet. They are divided into inlet and outlet chambers by baffles inside the tube box. This type of heat exchanger completely eliminates thermal stress. Its structure is simpler than that of the floating head type, but the tube side is not easy to clean.
4,Vortex thermal film heat exchanger The vortex thermal film heat exchanger adopts the latest vortex thermal film heat transfer technology. It enhances the heat transfer effect by changing the fluid movement state. When the medium passes through the surface of the vortex tube, it strongly scour the tube surface, thereby improving the heat exchange efficiency. The maximum temperature can reach up to 10,000 W/m ² ºC. Meanwhile, this structure achieves the functions of corrosion resistance, high temperature resistance, high pressure resistance and anti-scaling. The fluid channels of other types of heat exchangers are in a fixed-direction flow form, creating a circumferential flow on the surface of the heat exchange tubes, which reduces the convective heat transfer coefficient.
the most prominent feature of the vortex thermal film heat exchanger lies in the unity of economy and safety. Due to the consideration of the flow relationship between the heat exchange tubes and between the heat exchange tubes and the shell, the turbulence is no longer forced out by using baffles. Instead, the alternating vortex flow is naturally induced between the heat exchange tubes, and the appropriate vibration force is maintained under the premise of ensuring that the heat exchange tubes do not rub against each other. The rigidity and flexibility of the heat exchange tubes are well configured, preventing them from colliding with each other. This not only overcomes the problem of damage caused by mutual collision between floating tube heat exchangers but also avoids the problem of easy scaling in ordinary shell and tube heat exchangers.
Folding feature
1. Highly efficient and energy-saving, the heat transfer coefficient of this heat exchanger is 6000-8000W/m ² · C.
2. Made of all stainless steel, it has a long service life, which can reach over 20 years.
3. By changing laminar flow to turbulent flow, the heat exchange efficiency has been enhanced and the thermal resistance has been reduced.
4. It features fast heat exchange, high temperature resistance (400ºC) and high pressure resistance (2.5Mpa).
5. Compact structure, small floor space, light weight, easy installation, and savings in civil construction investment.
6. Flexible design, complete specifications, strong practicality and pertinence, and cost-saving.
7. It has a wide range of application conditions, suitable for a large pressure and temperature range as well as heat exchange of various media.
8. Low maintenance cost, easy operation, long scale removal cycle and convenient cleaning.
9. By adopting nano-thermal film technology, the heat transfer coefficient is significantly increased.
10. It has a wide range of applications and can be widely used in thermal power, factories and mines, petrochemicals, urban centralized heating, food and medicine, energy electronics, machinery and light industry, etc.
Application: It is suitable for liquid-phase heating, cooling, evaporation, concentration, etc. in industries such as electroplating, electrolysis, phosphating, degreasing, pickling, electroless nickel and phosphorus plating, anodizing, aluminum foil, smelting, electronics, chemical engineering, medicine, and food.
Installation Points
The heat exchanger should undergo a hydrostatic test at 1.5 times the maximum working pressure, and the steam part should not be lower than the steam supply pressure plus 0.3MPa. The hot water section should not be lower than 0.4MPa. Under the test pressure, keep the pressure unchanged for 10 minutes.
2) At the front end of the shell and tube heat exchanger, there should be space for the removal of the tube bundle, that is, the distance between the head and the wall or roof should not be less than the length of the heat exchanger, and the clear width of the equipment operation passage should not be less than 0.8m.
3) The installation height of all kinds of valves and instruments should be convenient for operation and observation.
4) The vertical clear distance from the highest point of the upper accessory of the heater (generally referring to the safety valve) to the lowest point of the building structure should meet the requirements of installation inspection and shall not be less than 0.2m.
1.Q: Where is your factory?
A:Hengshui, Hebei, China.
2.Q:How long is the delivery time?
A:For standard water tank (less than 100m³): it would be 5-8days;WIth large quantity of panels in stock, we can guarantee a quick lead time and a more favorable price.
For non-standard water tank and customized water tank: according to client s specific requirements, it would be 15 to 30 days.
4.Q:What is the warranty time for your products?
The warranty time of our products is 24 months, which guarantees a good after-sale service.
3.Q:Do you provide installation guidance?
Yes, we can provide installation guide: installation video or installation assistance on site by our engineers.
4.Q: Can we undertake EPC projects?
A: Of course, we are a mature company in all aspects, and our aim is to provide one-stop services without any intermediate links.
5.Q: Can you make customized products?
A: Yes, of course, if you can provide us with detailed specifications or drawings. Our mission is to make customers ideas on the products and provide the customer satisfied solutions.
6.Q: Can I use our own designed package?
A: Yes, size, color, logo, and packaging style all can be customized.
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