Basic Classification

Spiral plate heat exchanger is divided into detachable spiral plate heat exchanger and non-detachable spiral plate heat exchanger.

The structure of non-detachable spiral plate heat exchanger is relatively simple, and the two ends of the spiral channels are all welded together.

Detachable spiral plate heat exchanger. Except for the sealing structure at both ends of the spiral channel, the other is exactly the same as the non-detachable type. For the purpose of mechanical cleaning, the detachable spiral passage, one end open, is sealed with a flat plate cover and gasket to prevent fluid leakage to the atmosphere or a short circuit of fluid in the same passage. To improve the pressure-bearing capacity of the spiral plate, it is supported by a fixed distance column between the plate and the plate. There are two types of fluid inlet and outlet on the barrel: normal receiver and tangential receiver. The tangential receiver is commonly used in China, which has low fluid resistance and impurities are easily flushed out. The use of rotary support is more convenient, so that the heat exchanger can be placed upright or lying down.

Heat exchanger A, B fluid flow through the two sides of the spiral plate, one of the fluid along the spiral channel from the outside to the inside, to the center of the exit out; and the other fluid along the spiral channel from the center of the inlet, from the inside to the outside out. The two fluids flow in a pure countercurrent manner. The maximum structural dimensions of the spiral plate heat exchanger are: plate width of 1800 mm, outer diameter of 1700 mm, heat transfer area of 250 square meters, and the distance between plates of 20 mm. The maximum permissible operating pressure can be up to 2.5 MPa. The operating temperature is determined by the material chosen, which is mostly made of carbon steel, stainless steel, aluminum, copper and titanium.

Structural properties

1、Made of two rolled sheets, forming two uniform spiral channels, the two heat transfer media can be fully countercurrent flow, greatly enhancing the heat transfer effect, even if the two small temperature difference media, can also achieve the ideal heat transfer effect.

2、The receiver on the shell adopts the tangential structure, the local resistance is small, because the curvature of the spiral channel is uniform, the liquid flows in the equipment without a large turn, the total resistance is small, thus the design flow rate can be increased to make it have a high heat transfer capacity.

3、I type non-detachable spiral plate heat exchanger adopts welded seal on the end face of the spiral channel, so it has high sealing.

4、Type II detachable spiral plate heat exchanger has the same structure principle as the non-detachable heat exchanger, but one of the channels can be disassembled for cleaning, which is especially suitable for heat exchange of viscous and sedimented liquids.

5、Type III detachable spiral plate heat exchanger structure principle and non-detachable heat exchanger is basically the same, but its two channels can be disassembled for cleaning, a wider range of applications.

6, a single device can not meet the requirements of use, you can use more than one combination, but the combination must comply with the following provisions: parallel combination, series combination, equipment and channel spacing is the same. Mixed combination: a channel in parallel, a channel in series.

Basic features

Spiral plate heat exchanger has the advantages of small size, compact equipment, high heat transfer efficiency, low metal consumption, suitable for dry liquid-liquid, gas-liquid, gas-air convective heat transfer, steam condensation and liquid evaporation heat transfer, chemical, petroleum, pharmaceutical, machinery, electric power, environmental protection, energy saving and the need for heat conversion and other industries.

Spiral plate heat exchanger features are.

① Good heat transfer efficiency. Curved spiral channel and fixed distance column, conducive to enhancing the turbulent state of the fluid channel fluid resistance is small, can improve the design flow rate, which helps to improve the heat transfer coefficient. For water-water heat transfer, the heat transfer coefficient can reach 1.8 ~ 3.5 kilowatts per square meter per degree Celsius [kW / (m (- ℃)].

②Self-cleaning effect. When the fluid in the single channel passes through the impurity deposit in the channel, the flow rate will be relatively higher and the impurity will be easily flushed out.

③The non-detachable structure has good sealing performance and is suitable for heat exchange of highly toxic, flammable, explosive or precious fluids.

④The fluid in the adjacent channel flows in a pure countercurrent manner, which can obtain the maximum logarithmic mean temperature difference, which is conducive to small temperature difference heat transfer and suitable for recovering low temperature bit heat energy.

⑤Compact structure unit equipment volume of heat transfer area of up to 150m.

⑥Small temperature difference stress due to the elastic free expansion of the spiral channel itself.

⑦Low price. The same heat transfer area, the volume of the spiral plate heat exchanger than the traditional bow folded plate heat exchanger smaller than 1/3, the cost of raw materials required to reduce. Can choose the key to spiral plate heat exchanger is the problem of clogging, although it has a self-cleaning effect, but due to improper design or operation will also occur clogging, then even the use of detachable structure is also difficult to clean with mechanical methods. The use of water, gas or steam blowing cleaning, easy operation and better results. The biggest drawback of the spiral plate heat exchanger is the difficulty of maintenance, such as the occurrence of rupture of the inner ring spiral plate, it will make the whole equipment scrapped.