The Relationship between Spiral Plate Heat Exchanger and Thermal Energy System

During the cooling process, it is necessary not only to replace the high-temperature heat transfer oil in the hot equipment with the refrigerant tank, but also to cool down the hot equipment in the shortest possible time. The process flow can be described as follows: the heat transfer oil in the refrigerant storage tank is a Y-shaped oil filter, and the forced closed-loop liquid phase cooling cycle is carried out from the refrigerant pump to the oil and gas separator of the heat exchanger 'lipidation kettle' to the refrigerant storage tank. The key equipment in this process is the heat exchanger.

According to the process requirements, the spiral plate heat exchanger has the functions of high heat transfer efficiency, large heat transfer area, small temperature difference stress, accurate control of outlet temperature, and low risk of fouling and blockage. The commonly used tubular heat exchanger has low heat transfer efficiency, large volume, and significant temperature difference stress. When used in organic heat carrier thermal energy systems, the shell needs to be equipped with expansion joints, which increases metal consumption; Compared with tubular heat exchangers, spiral plate heat exchangers have their own advantages, which precisely meet the process requirements of organic heat carrier thermal energy systems.

A spiral plate heat exchanger is made by rolling two parallel thin steel plates on a spiral plate forming bed, forming two parallel rectangular spiral flow channels between the two steel plates for fluid to pass through. The thin steel plate is the heat transfer surface, and the inner ends of the two spiral shaped thin steel plates are welded to the central partition, which separates the flow channel. The end caps cover the flow channel system on both sides. Apply distance columns to keep two spiral plates at a distance from each other and improve the pressure bearing capacity of the spiral plates.

In the cooling process of organic heat carrier thermal energy systems, the temperature difference between the hot and cold fluids is large, and the temperature of the hot fluid can reach about 200 ° C. The cold fluid, namely circulating water, is at room temperature, which causes significant temperature difference stress in the tube heat exchanger. The characteristic of the spiral plate heat exchanger is that it allows expansion.

Due to its two longer spiral channels, when the spiral body is heated or cooled, it can stretch or contract like the mainspring in a clock. The spiral body is surrounded by hot fluid on one side and cold fluid on the other side, and the outer ring is in contact with the atmosphere. The temperature difference between the spiral bodies is not as obvious as the temperature difference between the tube and the shell in the tube heat exchanger, so there will be no significant temperature difference stress. The characteristic is to adapt to organic heat carrier thermal energy systems; Compact structure, large heat exchange area, simple manufacturing, and low investment. Not easily clogged with dirt.

In a spiral plate heat exchanger, due to the single channel flow path of the medium and its higher allowable flow rate compared to other types of heat exchangers, dirt is not easily deposited. If dirt is deposited in a certain part of the channel, the cross-sectional area of the channel will decrease, and the local flow rate will increase, which will have a flushing effect on the dirt area. Therefore, the dirt deposition rate is only 10% of that of a tubular heat exchanger, and it is easy to clean. This not only benefits the normal operation of the organic heat carrier thermal energy system, but also does not affect the heat transfer effect; Can accurately control the outlet temperature.