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Heat Exchanger Pressure Vessel

Views:0     Author:Site Editor     Publish Time: 2020-05-15      Origin:Site

  Heat exchangers are widely used in coal-to-oil plants. The role of heat exchangers is to complete the heat exchange of the medium. There are many types of heat exchangers, common ones include floating head heat exchangers, U-tube heat exchangers, fixed tube-plate heat exchangers, plate heat exchangers, and spiral plate heat exchangers.

ⅠMaterials

  There are many materials for manufacturing heat exchangers. The material of the barrel section is mainly low carbon steel and low alloy steel such as Q235-B / C, 20R, 16MnR; stainless steel such as 1Cr18Ni9, 00 Cr17 Ni14Mo2, 0 Cr13; high alloy steel 15 CrMoR; Non-ferrous metals Tu, Ti, Al, Mg and their alloys. In addition, in order to save equipment investment, a large number of composite steel plate materials are currently used, 20R + 0Cr13Al, 20R + 0Cr18Ni10Ti, 20R + 00Cr17Ni14Mo2, Q235-B + 0Cr18Ni9 composite steel plates. The base layer of the composite steel plate ensures the strength, and the multi-layer is in contact with the highly corrosive medium. The heat exchanger tube sheet material is mainly a forging of the above material. The heat exchanger tube bundle material is mainly low carbon steel 10 ﹟, stainless steel such as 1Cr18Ni9, 304, 316, 316L (00 Cr17 Ni14Mo2), Tu, Ti, Al and their alloys. 112 units of 112-E-101A / B, 112-E-102A / B four heat exchangers are extremely expensive titanium tube heat exchangers. Considering cost factors, the application of carbon steel pipe surface treatment technology is more and more, such as aluminized tube heat exchanger, 112-E-103 dehydrogenation tower bottom reboiler of 112 unit, 112-E-104 deamination tower bottom weight The tube bundles of the two reboilers at the bottom of the boiler are carbon steel tubes for aluminizing treatment, which can not only save investment but also meet the requirements of anti-corrosion. 

ⅡStructure

1. Floating head heat exchanger

  The floating head heat exchanger is divided into two tube pass heat exchangers, four tube pass heat exchangers, six tube pass heat exchangers, etc. according to the number of channels through which the medium flows on the tube side. The difference in the number of tube passes is determined by the structure of the split partitions of the tube box and the floating head cover.

  The length of the floating head heat exchanger is generally 1.5m, 3m, 4.5m, 6m, 9m, 12m, the common is the 6m, 9m heat exchanger

  The floating head heat exchanger is mainly composed of a tube box, a tube bundle, a shell, a floating head cover, a floating head hook ring, a floating head flange, an outer head cover, etc. The tube box is divided into a head tube box and a flat cover tube box. Its components are mainly the tube box flange, barrel section and split partition.

  The components of the tube bundle are mainly fixed tube sheets, floating tube sheets, heat exchange tubes, fixed distance tubes, baffles, tie rods, and buffer plates.

  The main components of the shell are the container flange and the barrel section on both sides. The flange of the container connected to the tube box is called the side flange of the tube box, and the flange of the container connected to the outer head cover is called the flange of the outer head cover.

  The floating head cover, floating head hook ring, and floating head flange form an integral body, which plays an important role in separating the shell and tube. It is also one of the main components that is easy to cause internal leakage in the heat exchanger.

  The outer head cover components are mainly the outer head cover flange and barrel section.

  The tube box, tube bundle, floating head cover, floating head hook ring, and floating head flange together constitute the tube side part of the heat exchanger. The shell and outer head cover together form the shell side part of the heat exchanger.

  The tube side part and the shell side part are completely isolated by the fixed tube sheet, the floating head cover and the sealing structure of each flange, if any component fails, it will cause internal leakage of the heat exchanger. When the heat exchanger leaks, the medium flows in series according to the different operating pressure, and it must be repaired in time.

  The pressure test procedure of floating head heat exchanger is as follows:

  A Use the pressure test ring to connect the tube plate and the tube head to test the pressure.

  B Pipe test pressure

  C Shell side pressure test

  The pressure test is qualified with no leakage, no visible deformation, and no abnormal noise.

2. Fixed tube-plate heat exchanger

  The fixed tube-plate heat exchangers are divided into one tube-pass heat exchanger, two tube-pass heat exchanger, four tube-pass heat exchanger, etc. according to the number of passes. The difference in the number of tube passes is determined by the structure of the split partitions in the front and back (or upper and lower) tube boxes. The fixed tube-plate heat exchanger is mainly composed of front and rear (or up and down) tube boxes, tube bundles, shells, etc.

  The pipe box is divided into a head pipe box and a flat cover pipe box, and its components are mainly a pipe box flange, a barrel section and a split partition.

  The tube bundle components are mainly front and rear (or up and down) tube sheets, heat exchange tubes, fixed distance tubes, baffles, tie rods, and buffer plates.

  The main component of the shell is the barrel section. The barrel section is welded to the front and back (or up and down) tube plates, that is, the shell and the tube bundle are a combined body. The front and back (or up and down) tube boxes and tube bundles form the tube side part of the heat exchanger. The shell is the shell side part of the heat exchanger.

  The tube side part and the shell side part are completely isolated by the front and back (or up and down) tube sheets and the sealing structure of each flange, if any component fails, it will cause internal leakage of the heat exchanger. When the heat exchanger leaks, the medium flows in series according to the different operating pressure, and it must be repaired in time.

  The pressure test procedure of the fixed tube-plate heat exchanger is as follows:

  A Shell side pressure test, while checking the connection strength and compactness of the tube sheet           and tube head

  B Tube pressure test

     The pressure test is qualified with no leakage, no visible deformation, and no abnormal noise.


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