Plate heat

NegotiableUpdate on 04/20

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Nature of the Manufacturer: Producers

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Overview

Plate heat exchanger is an efficient heat exchanger composed of a series of metal sheets with certain corrugated shapes stacked together. Thin rectangular channels are formed between various plates for heat exchange. Plate heat exchangers are ideal equipment for heat exchange between liquid and liquid, as well as between liquid and vapor. It has the characteristics of high heat transfer efficiency, low heat loss, compact and lightweight structure, small footprint, wide application, and long service life. Under the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of a tube heat exchanger, occupying one-third of the area of a tube heat exchanger, and its heat recovery rate can reach over 90%.

Product Details

Structural principle

A detachable plate heat exchanger is composed of many stamped corrugated thin plates at certain intervals, sealed by gaskets on all sides, and overlapped and compressed by a frame and a clamping screw. The four corner holes of the plates and gaskets form the distribution and collection pipes for the fluid, while reasonably separating the hot and cold fluids, allowing them to flow in the flow channels on both sides of each plate and exchange heat through the plates.

The optimization design calculation of plate heat exchanger is to reasonably determine its model, process and heat transfer area under the condition of known temperature difference ratio NTUE, so that NTUp equals NTUE.

characteristic

Comparison between Plate Heat Exchanger and Shell and Tube Heat Exchanger

a. High heat transfer coefficient;

Due to the inversion of different corrugated plates, a complex flow channel is formed, allowing the fluid to rotate in three dimensions within the flow channels between the corrugated plates. Turbulence can be generated at lower Reynolds numbers (generally Re=50~200), resulting in a high heat transfer coefficient, which is generally considered to be 3~5 times that of the shell and tube type.

b. The logarithmic mean temperature difference is large, while the end temperature difference is small.

In a shell and tube heat exchanger, two fluids flow separately in the tube side and shell side, generally exhibiting cross flow and a small logarithmic mean temperature difference correction coefficient. Plate heat exchangers, on the other hand, often flow in parallel or counter current, with a correction coefficient of around 0.95. In addition, the flow of cold and hot fluids in the plate heat exchanger is parallel to the heat transfer surface and has no bypass flow, resulting in a small temperature difference at the end of the plate heat exchanger and a water heat transfer of less than 1 ℃, while shell and tube heat exchangers generally have a temperature difference of 5 ℃

Plate heat exchanger

c. Small footprint.

Plate heat exchangers have a compact structure, with a heat transfer area per unit volume that is 2-5 times that of shell and tube heat exchangers. Unlike shell and tube heat exchangers, they do not require reserved maintenance areas for extracting tube bundles. Therefore, to achieve the same heat transfer, plate heat exchangers occupy an area of approximately 1/5 to 1/8 of that of shell and tube heat exchangers.

d. Easy to change the heat exchange area or process combination;

By adding or reducing a few plates, the goal of increasing or decreasing the heat transfer area can be achieved; Changing the arrangement of plates or replacing a few plates can achieve the required process combination and adapt to new heat exchange conditions, while the heat transfer area of shell and tube heat exchangers is almost impossible to increase.

e. Lightweight;

The plate thickness of plate heat exchangers is only 0.4~0.8mm, while the thickness of heat exchange tubes in shell and tube heat exchangers is 2.0~2.5mm. The shell of shell and tube heat exchangers is much heavier than the frame of plate heat exchangers, and plate heat exchangers are generally only about 1/5 of the weight of shell and tube heat exchangers.

f. Low price;

Using the same materials and with the same heat exchange area, the price of plate heat exchangers is about 40% to 60% lower than that of shell and tube heat exchangers.

g. Easy to produce;

The heat transfer plates of plate heat exchangers are processed by stamping, with a high degree of standardization and can be mass-produced. Shell and tube heat exchangers are generally handmade.

h. Easy to clean;

As long as the clamping bolts of the frame plate heat exchanger are loosened, the plate bundle can be loosened and the plates can be removed for mechanical cleaning, which is very convenient for heat exchange processes that require frequent cleaning of equipment.

plate heat exchanger

i. Low heat loss;

Plate heat exchangers only expose the outer shell of the heat transfer plate to the atmosphere, so the heat dissipation loss can be ignored and no insulation measures are required. And shell and tube heat exchangers have high heat loss and require insulation layers.

j. Small capacity;

About 10% to 20% of shell and tube heat exchangers.

k. The pressure loss per unit length is large;

Due to the small gap between the heat transfer surfaces and the presence of irregularities on the heat transfer surfaces, the pressure loss is greater than that of traditional smooth tubes.

l. Not prone to scaling;

Due to sufficient turbulence inside, it is not easy to scale, and its scaling coefficient is only 1/3 to 1/10 of that of shell and tube heat exchangers

m. Work pressure should not be too high, as leakage may occur;

Plate heat exchangers are sealed with gaskets, and the working pressure should generally not exceed 2.5 MPa. The medium temperature should be below 250 ℃, otherwise there is a possibility of leakage.

n. Easy to clog;

Due to the narrow channels between the plates, usually only 2-5mm, it is easy to block the inter plate channels when the heat exchange medium contains larger particles or fibrous substances.