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2022-09-30

Leakage It is mainly manifested as leakage (small amount, discontinuous water droplets) and leakage (large amount, continuous water droplets). The main parts of external leakage are the sealing part between plates, the second sealing groove of plates, and the inner side of end plates and compression plates. Efflux The main feature is that the medium on the higher side of the pressure runs into the medium on the lower side of the pressure, and there will be abnormal pressure and temperature in the system. If the medium is corrosive, it may also cause corrosion of the sealing gasket of plate heat exchanger. The cross flow usually occurs in the diversion area or the secondary sealing area. High pressure drop The pressure drop at the inlet and outlet of the medium exceeds the design requirements, even many times higher than the design value, which seriously affects the requirements of the system on flow and temperature. In the heating system, if the pressure drop at the hot side is too large, the flow at the primary side will be seriously insufficient, that is, the heat source is not enough, resulting in the outlet temperature at the secondary side can not meet the requirements. The heating temperature cannot meet the requirements The main feature is that the outlet temperature is too low to meet the design requirements.

Cooling characteristics of shell and tube heat exchanger

2022-09-30

1. The heat transfer tube adopts the copper tube with rolled fins on the outer surface, which has high thermal conductivity and large heat transfer area. 2. The guide plate guides the shell side fluid to flow continuously in the heat exchanger in a broken line shape. The distance between the guide plates can be adjusted according to the good flow rate. The structure is solid and can meet the heat transfer of shell side fluid with large flow or even super large flow and high pulsation frequency. 3. When the shell side fluid is oil, it is suitable for heat exchange of oil with low viscosity and relatively clean.

Component functions of plate heat exchanger

2022-09-30

Reasonable selection of heat exchange area is the key to procurement. When selecting the heat exchanger, the required flow shall be selected according to the process requirements, the viscosity of the feed liquid, the temperature difference of the heat exchange, etc. Excessive flow will cause waste, and the flow channel is easy to block. If the pressure is too small, it will affect the use, increase the non fermentation time, and cause damage to the deflector due to excessive pressure. Therefore, scientific selection and purchase shall be made according to working conditions. The plate thickness of plate heat exchanger is only 0.6~0.8mm, and the heat exchange tube thickness of shell and tube heat exchanger is 2.0~2.5mm; The shell of shell and tube heat exchanger is much heavier than the layout of plate heat exchanger. In the case of completing the same heat transfer mission, the required heat transfer area of plate heat exchanger is smaller than that of shell and tube heat exchanger. The layout of shell and tube heat exchanger is excellent in terms of strength, but it is not ideal from the perspective of heat exchange. As the fluid moves in the shell side, there are baffles shell, baffles heat exchange tubes, and tubes shell bypasses. The fluid passing through these bypasses does not fully participate in heat transfer. In plate heat exchanger, there is no bypass, and the ripple of plate can make the fluid turbulent at a small flow rate. Therefore, the plate heat exchanger has a high heat transfer coefficient, which is usually 3~5 times that of the shell and tube heat exchanger.

Assembly and disassembly of plate heat exchanger

2022-09-30

The newly purchased heat exchanger has been installed as a whole and can be installed as a whole. If it is not necessary, it shall not be disassembled. The removal and reinstallation of plate heat exchanger are very meticulous work, which should be carried out by experienced personnel according to certain rules to ensure good sealing and normal use after installation. Improper assembly, disassembly and installation will cause poor sealing and even plate deformation and damage, which is difficult to recover. Before dismantling the heat exchanger, the original thickness of the plate group shall be measured with a steel ruler at the upper, lower, left and right corners of the equipment and recorded. This thickness shall be restored as much as possible during re installation. If the number of plates is increased or decreased, the correct total thickness shall be calculated first. For example, with 80 BR50 plates, the nominal thickness is 80 × (３．８+0.６)=３５２mm The difference between the thickness after installation and compaction and the nominal value shall be less than 1%, and the thickness of the above example shall be 347~357mm. Plate heat exchanger is usually compressed into a whole with 6~12 bolts. During assembly and disassembly, these bolts shall be tightened or loosened evenly and evenly without uneven tightness. When removing the loosening bolt, loosen the middle bolt first and then the four corners. At the beginning, it should be 1~2 turns each time, more later, and repeated several times until it is completely released. During the relaxation process, the total thickness of the plate shall be measured at the four corners. The left and right deviations shall not exceed 10mm, and the upper and lower deviations shall not exceed 25mm.

What are the characteristics of gas flow in the heat exchanger?

2022-09-30

The heat exchanger has different thermal characteristics due to different gas flow modes. Under the condition that the temperature of exhaust gas entering the heat exchanger is the same, the air can be preheated to a higher temperature by counter current than by forward current. Under the same other conditions, the heat transfer of countercurrent heat exchanger is larger than that of downstream heat exchanger, and its structure is more compact than that of downstream heat exchanger. From the working conditions of the heat exchanger wall, the forward flow type is more favorable. Because the temperature of the heat exchanger wall is almost the same for both ends of the parallel flow heat exchanger, its maximum temperature is lower than that of the counter flow heat exchanger, the heat exchanger is not easy to be deformed or damaged, and the material requirements are not high. On the counter flow heat exchanger, the wall temperature at the high temperature end is close to the exhaust gas population temperature, and the temperature difference between the two ends is large. This puts forward higher requirements for the material of the wall, and due to the large temperature difference at both ends, it is easy to deform and damage. In practical application, most heat exchangers adopt countercurrent mode.

Plate heat exchanger uses corrosion inhibitor to achieve anti-corrosion maintenance effect

2022-09-30

How to maintain and prevent corrosion of plate heat exchanger during use? After knowing the various causes of heat exchanger corrosion, how to select appropriate anti-corrosion measures to achieve the goal of efficient use of equipment. According to the corrosion related conditions, the following anti-corrosion methods are proposed: corrosion inhibitors are mainly introduced here. Use corrosion inhibitor to prevent corrosion. The combination of corrosion inhibitor and cathodic inhibitor can give satisfactory and economical anti-corrosion effect. Chromate zinc polyphosphate: polyphosphate is used because it has the function of cleaning metal surface and corrosion inhibition. Polyphosphate can be partially converted into orthophosphate, which meets with calcium to form colloidal cation, which has the effect of inhibiting the formation of impurities in plate heat exchanger. Chromate zinc phosphonate: This method uses sodium phosphonate instead of polyphosphate, which is similar to the previous method. The scale that is about to be formed is effectively inhibited by carbamate phosphate, and the precipitation of calcium salt can be controlled even if the pH value is 9. Chromate zinc hydrolyzed polyacrylamide: due to the dispersion of hydrolyzed polyacrylamide of cationic copolymer, the scale in plate heat exchanger can be prevented from turning into dirt.

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