Heat exchange and condensation equipment series

The spiral plate heat exchanger is a highly efficient heat exchange equipment, suitable for heat transfer between vapor-vapor, vapor-liquid, and liquid-liquid. It is applicable to industries such as chemistry, petroleum, solvents, pharmaceuticals, food, light industry, textiles, metallurgy, steel rolling, and coking. According to the structural form, it can be divided into non-detachable (Type I) spiral plate heat exchangers and detachable (Type II, Type III) spiral plate heat exchangers.

Years of practical use have proven that the spiral plate heat exchanger is indeed a highly efficient heat exchange equipment. It is applicable to industries such as chemistry, petroleum, solvents, pharmaceuticals, food, light industry, textiles, metallurgy, steel rolling, and coking. The heat exchanger absorbs contemporary international advanced technologies and is a liquid-liquid, vapor-water heat exchanger manufactured through unique optimized design. The product's structural process complies with the standards of the Swedish Alfa Laval company. The end face of the spiral plate adopts flanged argon arc welding, and the special process for the top distance column is a capacitive energy storage contactor, which has improved the internal and external quality and has been recognized by Baosteel, enabling it to replace imports.

The non-detachable spiral plate heat exchanger is designed according to the standards of the Ministry of Machinery JB/TQ724-89 for the form, basic parameters, and dimensions of non-detachable spiral plate heat exchangers. It has advantages such as simple manufacturing, low cost, small volume, and good heat transfer performance. However, it also has its disadvantages, such as the inability to perform mechanical cleaning and difficulty in maintenance when it is damaged. The user should select specific equipment according to the actual situation of the project to make it most effective.

Structure and Performance

1. This equipment is suitable for: liquid-liquid, gas-gas, and gas-liquid convective heat transfer. It can be used for steam condensation and liquid evaporation heat transfer. It can be selected by industrial departments such as chemical, petroleum, pharmaceutical, machinery, electric power, light industry, and textiles.

2. This equipment is made by rolling two steel plates, forming two uniform spiral channels. The two heat transfer media can flow in full countercurrent, which is suitable for heat transfer with a small temperature difference, facilitating the recovery of low-temperature heat sources and enabling accurate control of the outlet temperature.

3. The nozzles on the shell have a tangential structure, with low local resistance. The curvature of the spiral channel is uniform, and the fluid does not have large direction changes when flowing inside the equipment. The overall resistance is low, so the design flow rate can be increased to make it have a higher heat transfer capacity.

4. The end face of the spiral channel is sealed by welding, with good sealing performance and a reliable structure.

5. It is not easy to maintain, especially when there is a problem with the internal plate, it is extremely difficult to repair. Some factories turn off all the welds at both ends of the equipment, flatten the plate, repair the welds, and then roll it again. This consumes too much man-hours. Therefore, anti-corrosion is very important when selecting a spiral plate heat exchanger.

6. Mechanical cleaning cannot be performed. Production practice has proven that compared with ordinary shell-and-tube heat exchangers, the spiral plate heat exchanger is not easy to be blocked. Especially, suspended particulate impurities such as sediment and small shells are not easy to deposit in the spiral channel. Analyzing the reasons: First, because it is a single channel, once impurities deposit in the channel, the circulating flow rate will increase to flush them away. Second, because there are no dead corners in the spiral channel, impurities are easy to be flushed out.

7. Since there are distance columns in the spiral channel to support the channel spacing, fibrous impurities (such as cotton yarn, straw sticks, leaves, etc.) must not enter the inside of the heat exchanger.

8. Strictly control the outlet temperature of the cooling water below the scaling temperature.

9. The commonly used cleaning methods are steam purging or alkaline cleaning. Steam should be blown into the nozzles to blow out the impurities from the equipment. Many users believe that this is an effective method.

Detachable (Type II, Type III) Spiral Plate Heat Exchangers

The structural principle is basically the same as that of the non-detachable heat exchanger, but the channels can be disassembled for cleaning, and both ends are sealed with heads. It is especially suitable for liquid-liquid exchange of viscous and precipitating liquids, as well as gas-liquid and steam condensation. Since the detachable heat exchanger needs to add components such as heads and flanges, the equipment cost is slightly higher than that of the non-detachable heat exchanger.

Basic Parameters

The nominal pressure PN of the spiral plate heat exchanger is specified as 0.6, 1, 1.6, 2.5 Mpa (i.e., the original 6, 10, 16, 25 kg/cm²) (referring to the maximum working pressure of a single channel). The test pressure is 1.25 times the working pressure.

The materials of the part of the spiral plate heat exchanger in contact with the medium are Q235A and Q235AF for carbon steel, and SUS321 and SUS304 for acid-resistant stainless steel. Other materials can be selected according to user requirements.

Permissible operating temperature: For carbon steel, t = 0 to +350°C; for acid-resistant stainless steel, t = -40 to 500°C. The temperature rise and pressure reduction range shall comply with the relevant regulations of pressure vessels. When selecting this equipment, appropriate process calculations should be carried out to make the fluid in the equipment channels reach a turbulent state. (Generally, the liquid flow rate is 1 m/Sec and the gas flow rate is 10 m/Sec).

If a single device cannot meet the usage requirements, multiple devices can be used in combination, but the combination must comply with the following regulations:

Parallel combination and series combination: The devices and channel spacings are the same. Mixed combination: One channel is in parallel and one channel is in series.

Non-detachable (Type I) Spiral Plate Heat Exchangers Made of Acid-Resistant Stainless Steel with PN 0.6 and 1.6 MPa.