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Plate Heat Exchanger Basic Classification
Dec 07, 2017

The suitable heat exchanger of the plate heat exchanger is a new type of high efficiency heat exchanger made from a series of metal sheets with a certain shape of corrugated metal. Thin rectangular channels are formed between various plates to exchange heat through plates. The plate heat exchanger is an ideal equipment for the heat exchange of liquid - liquid and liquid - vapor. It has the characteristics of high heat transfer efficiency, small heat loss, compact and compact structure, small area, convenient installation and cleaning, wide application and long service life. In the case of the same pressure loss, the heat transfer coefficient is 3-5 times higher than in the heat exchanger tube, area of heat exchanger 1/3, heat recovery rate can be as high as 90%.

The basic classification in general, we mainly according to the structure between heat exchanger, which is based on the shape to distinguish, can be divided into four categories: the plate heat exchanger (also called the zone plate heat exchanger gasket), the welded plate heat exchanger, the spiral plate heat exchanger, the plate type heat exchanger (also called the honeycomb type heat exchanger).

The welding plate heat exchanger is divided into half welded plate heat exchanger, all welded plate heat exchanger, plate and shell type heat exchanger and brazing plate heat exchanger.

The categories that are often used are as follows:

1> according to the number of heat transfer units in the unit space, the plate heat exchanger is a compact heat exchanger, which is mainly compared with the shell and tube heat exchanger. The traditional shell and tube heat exchanger occupies a large area.

According to the 2> technology applications, and has different names: plate heater, cooler, condenser, plate type preheater; 3> process according to the combination, divided into one-way heat exchanger and multipass heat exchanger; 4> according to the flow direction of the two media, divided into the downstream (flow) heat exchanger, countercurrent heat exchanger, cross flow (cross) heat exchanger, which use more 5>; according to the gap size of the runner, divided into conventional gap plate heat exchanger and wide gap plate heat exchanger; according to 6> there were more detailed corrugated plate heat exchanger, the no longer tired, please refer to: corrugated plate heat exchanger form.

According to whether the 7> is a complete set of products, it can be divided into a single machine plate heat exchanger and a plate type heat exchanger unit.

Plate Type Heat Exchanger, the complete set of equipment is composed of plate heat exchanger, balance tank, centrifugal sanitary pump, hot water device (including steam pipeline, hot water injector), bracket and instrument box. It is used for the sterilization and cooling of milk or other hot sensitive liquids.  The materials to be processed are advanced into the balance tank, and sent into the heat exchanger by centrifugal sanitary pump. After preheating, sterilization, heat preservation and cooling, all the materials that do not reach the sterilization temperature are changed by the instrument to control the pneumatic return valve, and then go back to the balance tank for reprocessing. The sterilization temperature of the material is automatically controlled and continuously recorded by the instrument control box, so as to monitor and check the sterilization process. This equipment is suitable for pre sterilization and sterilization of milk. There are two main types of plate heat exchangers: frame type (detachable) and brazing type. The form of plate is mainly composed of three kinds of corrugated plates, horizontal flat corrugated plates and tumor shaped plates.

Although the plate heat exchanger has the above advantages, it can not completely replace the shell and tube heat exchanger. On the one hand is due to heat exchanger medium cleanliness requirements higher, it requires the impurity particles in the medium diameter less than 1.5~2mm; on the other hand is due to plate type heat exchanger (commonly known as the early detachable heat exchanger) only applies to the work pressure is less than 1.6MPa, for temperatures between 120~165 degrees Celsius conditions.

By using the 1.1MPa heat exchanger station; superheated steam temperature of 230 DEG C, the gasket temperature limit (EPDM gasket temperature of 150 DEG C, EPDM high temperature resistant gasket is 180 DEG C, high temperature resistant PTFE gasket temperature is only 220 degrees Celsius, and the price is expensive, 8 times of high temperature EPDM the left and right), so the traditional gasket detachable heat exchanger is not suitable for the requirements of working conditions. If brazing plate heat exchanger or laser fully welded plate heat exchanger is used, the cost of the equipment is large (about 3~5 times the price of the detachable plate heat exchanger), and it is not removable and is not easy to maintain.

Therefore, the ultimate in add cooling device of traditional removable plate heat exchanger in front of the scheme, in this scheme, the heat transfer efficiency is low, but high temperature resistant shell and tube heat exchanger as steam desuperheater, using a part of heating water (about 10% of the total water flow of the left and right) after overheating steam down to 150~180 DEG C, and into the heat exchanger in the remaining part of the heating water for heating, this scheme fully utilizes the two heat exchanger of the upper hand, and the hot water side operates in parallel, series is more effective in reducing the pressure drop, more energy.