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Common problems and solutions of high-efficiency plate heat exchangers for low-temperature heating

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Common problems and solutions of high-efficiency plate heat exchangers for low-temperature heating

(Summary description)A problem often encountered in actual heating is that the temperature of the primary water supply in some thermal stations is very low, even as low as 50℃ in extreme cases. At this time, the operation management party often increases the number of plates, increases the flow of circulating pumps, and connects in parallel. Emergency measures such as heat exchangers.

Common problems and solutions of high-efficiency plate heat exchangers for low-temperature heating

(Summary description)A problem often encountered in actual heating is that the temperature of the primary water supply in some thermal stations is very low, even as low as 50℃ in extreme cases. At this time, the operation management party often increases the number of plates, increases the flow of circulating pumps, and connects in parallel. Emergency measures such as heat exchangers.

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Frequently encountered problems in the operation of heating power stations

A problem often encountered in actual heating is that the temperature of the primary water supply in some thermal stations is very low, even as low as 50℃ in extreme cases. At this time, the operation management party often increases the number of plates, increases the flow of circulating pumps, and connects in parallel. Emergency measures such as heat exchangers.

The above measures cannot fundamentally improve the temperature of the secondary water supply. When the heat source temperature is insufficient, this type of working condition actually brings about the problem of the logarithmic mean temperature difference. At this time, it is necessary to find a way from the heat exchanger body to solve the problem of efficient heat transfer when the logarithmic mean temperature difference drops.

How to solve the problem of low water temperature of heat source

When the temperature of the heat source water supply is insufficient (or when the user wants to provide low-temperature heating in consideration of overall energy saving), the high-efficiency plate heat exchanger is used to reduce the temperature difference between the primary and secondary water supply as much as possible to meet the needs of the user. A good heat exchanger can realize that the temperature of the secondary water supply is only 1℃ lower than the temperature of the primary water supply. For example, the temperature of the primary water supply is 55℃, and the high-efficiency plate heat exchanger provides the secondary water supply temperature of 54℃. In this case, the primary network is required. There is a larger flow to meet the total heating load. The temperature difference is related to the cost of the equipment, which can be weighed based on actual working conditions and applications. Therefore, the key to solving the problem of low-temperature heating on the heat source side is to improve the heat exchange performance of the plate heat exchanger.

What method can be used to effectively solve

There are usually several ways to improve heat transfer performance of plate heat exchangers, namely by changing the design of the corrugated plate of the core heat transfer element to change the matching of heat transfer and pressure drop characteristics to achieve high heat transfer performance under allowable pressure drop:

①The corrugated plate adopts shallow and dense corrugation: this method has the most direct effect on the enhancement of heat transfer of the equipment body, and can be used in a heating system with good water quality;

②Using a multi-process structure: the flow time of hot and cold fluids in their respective channels is lengthened, but the disadvantage is that the equipment has a special structure, which is difficult to maintain and disassemble in the later period;

③Using the lengthened process ripple form: Taking into account the advantages and disadvantages of the above two methods, this equipment lengthens the process of the heat exchange plate itself (that is, lengthens the process plate type), and avoids heating when the flow channel gap remains unchanged. The problem of easy blocking of water quality.

The above-mentioned third method of plate heat exchanger products are usually also called high-efficiency small temperature difference plate heat exchangers ("small temperature difference" refers to the logarithmic average temperature difference). Such products mainly increase the heat exchange efficiency of the heat exchanger by lengthening the process, thereby realizing high-efficiency heat exchange with less heat loss.

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