What are the advantages and disadvantages of spiral plate heat exchanger? Which young hero can help

Advantages: The spiral plate heat exchanger is best used for the condensation of steam and convective heat transfer without phase change, and can also be used for boiling heat transfer.

Good heat transfer efficiency. The curved spiral channel and fixed distance column are conducive to enhancing the turbulent state of the fluid, and the fluid resistance in the channel is small, which can increase the design flow rate and help to improve the heat transfer coefficient. For water-to-water heat exchange, the heat transfer coefficient can reach kW (m(· It has a self-cleaning effect.

When the fluid in a single channel passes through the impurity deposit in the channel, the flow rate will be relatively high, and the impurities will be easily washed away. The non-detachable structure has good sealing performance and is suitable for heat exchange of highly toxic, flammable, explosive or valuable fluids. The fluid in the adjacent channel flows in a pure countercurrent mode, which can obtain the largest logarithmic average temperature difference, which is conducive to heat transfer with a small temperature difference, and is suitable for low temperature heat energy.

The heat transfer area per unit unit of equipment volume can reach 150 meters ( m(. Due to the elastic free expansion of the spiral channel itself, the temperature difference stress is small. **Inexpensive.

Disadvantages: The key to the choice of spiral plate heat exchanger is the problem of clogging, although it has a self-cleaning effect, it can also occur due to improper design or operation, and it is difficult to clean mechanically even with a detachable structure. It is purged with water, gas or steam, which is convenient to operate and has better results.

The biggest disadvantage of spiral plate heat exchanger is that it is difficult to overhaul, if the inner ring spiral plate is broken, the entire equipment will be scrapped.

Advantages: The spiral plate heat exchanger has a compact structure, and the heat transfer surface provided per unit volume is large, such as the spiral plate heat exchanger with a diameter of 1500mm and a height of 1200mm can reach a heat transfer surface of 130m2. The allowable flow velocity of the fluid in the spiral plate is high, and the fluid flows along the spiral direction, and the stagnant layer is thin, so the heat transfer coefficient is large and the heat transfer efficiency is high.

In addition, due to the high flow rate, dirt is not easy to retain.

Disadvantages: spiral plate heat exchanger requires high welding quality, and it is difficult to overhaul. Due to its large weight and poor rigidity, special attention should be paid to the transportation and installation of spiral plate heat exchangers.

Production practice proves that the spiral plate heat exchanger is not easy to block compared with the general tubular heat exchanger, especially the suspended particle impurities such as sediment and small shells are not easy to be deposited in the spiral channel, and the reasons are analyzed; First, because it is a single-channel impurity deposited in the channel, as soon as the flow of turnover is formed, it will be raised to wash it out, and second, because there is no dead angle in the spiral channel, and the impurities are easy to be washed out.

Due to the special effect of the corrugated surface of the plate, the spiral plate heat exchanger makes the fluid flow along the narrow curved channel and its velocity direction is constantly changed, resulting in the strong end movement of the fluid at a small flow rate (RC=200), which accelerates the destruction of the fluid boundary layer, strengthens the heat transfer process, and effectively improves the heat transfer capacity.

And make it have the outstanding advantages of compact structure, low metal consumption, large operational flexibility, small heat loss, easy installation, inspection and dismantling, strong corrosion resistance, and long service life. The process of heat exchanger is assembled by many plates according to a certain process and the technical work requirements of the demand side.

When assembling, plate A and plate B are arranged alternately, a mesh channel is formed between the plates, four corner holes form a distribution pipe and a confluence pipe, and the sealing gasket seals the hot and cold medium in the heat exchanger, and at the same time, the cold and hot medium are reasonably separated without mixing. In the channel, the hot and cold fluids flow at intervals, either counter-current or downstream, and the hot and cold fluids are exchanged through the plate wall during the flow process.

There are many process combination forms of spiral plate heat exchanger, which are realized by using different commutation plates and different assembly, and the process combination form can be divided into single process, multi-process and vapor-liquid exchange process and mixed process form.

The plate type heat exchange efficiency is high, the plate is thin, the gap of the spiral plate is large, and the working conditions are complex.

A spiral heat exchanger is a heat exchanger in which two parallel metal plates are coiled into two spiral channels, and the hot and cold fluids are exchanged through the spiral plate wall. There are two types of spiral plate heat exchangers: detachable and non-detachable. Spiral plate heat exchanger has the advantages of small size, compact equipment, high heat transfer efficiency and low metal consumption, and is suitable for dry liquid-liquid, gas-liquid, gas-gas convection heat transfer, steam condensation and liquid evaporative heat transfer, chemical, petroleum, pharmaceutical, machinery, electric power, environmental protection, energy saving and heat conversion industries.

Spiral plate heat exchangers are divided into detachable spiral plate heat exchangers and non-detachable spiral plate heat exchangers. The structure of the non-detachable spiral plate heat exchanger is relatively simple, and both ends of the spiral channel are welded dead. Detachable spiral plate heat exchanger.

Except for the sealing structure at both ends of the spiral channel, it is exactly the same as the non-detachable type. For the purpose of mechanical cleaning, the detachable spiral channel, with one end open, is sealed with a flat cover and gasket to prevent the fluid from leaking into the atmosphere or the fluid in the same channel from being short-circuited. In order to improve the pressure-bearing capacity of the spiral plate, it is supported by a fixed-distance column between the plates.

There are two types of fluid inlet and outlet on the cylinder: normal connection and tangential connection. Tangential pipes are commonly used in China, which has low fluid resistance and impurities are easy to be washed out. It is more convenient to use a slewing bearing, which can make the heat exchanger stand or horizontal.

The A and B fluids of heat exchange flow through both sides of the spiral plate respectively, and one of the fluids flows out from the outside to the inside along the spiral channel to the central outlet; The other fluid is imported from the center along the spiral channel and flows out from the inside out. The two fluids flow in a pure counter-current mode. The maximum structure size of spiral plate heat exchanger is:

The width of the plate is 1800 mm, the outer diameter is 1700 mm, the heat transfer area is 250 square meters, and the distance between the plates is 20 mm. The maximum permissible operating pressure is up to MPa. The operating temperature is determined by the materials used, which are mostly carbon steel, stainless steel, aluminum, copper and titanium.

Spiral plate heat exchanger is divided into fixed-pitch column spiral plate heat exchanger and bubbling spiral plate heat exchanger, bubbling spiral plate is relative to fixed-distance column spiral plate, fixed-distance column spiral plate due to welding and bending in the manufacturing process, as well as the scouring of objects in the process of use. And so on, it will cause the phenomenon of the fixed distance column falling off, and the falling off of the fixed distance column will greatly reduce the service life of the spiral plate. The bubbling spiral plate belongs to the integral stamping form, and the reliability is greatly improved, so there is no phenomenon of the fixed distance column falling off.

Suzhou Wanyihong spiral plate.

heat exchanger supplied).

The Spiral Plate Heat Exchanger consists of a heat exchanger consisting of spiral-shaped plates.

Spiral plate heat exchanger is a kind of high-efficiency heat exchanger equipment, which is suitable for steam, vapor-liquid, and liquid, and conducts heat transfer to liquid. It is suitable for chemical, petroleum, solvent, pharmaceutical, food, light industry, textile, metallurgy, steel rolling, coking and other industries. According to the structural form, it can be divided into non-detachable (type) spiral plate type and detachable (type, type) spiral plate heat exchanger.

The current standard is JB T4751-2003 "Spiral Plate Heat Exchanger".