CN203881201U - Heat exchanger with rectangular holes formed in baffle plates - Google Patents

Abstract

The utility model provides a heat exchanger in the form of a baffle with rectangular holes. It includes a shell, the two ends of the shell are provided with upper and lower heads, the shell is also opened with shell side inlet and outlet, tube side inlet and outlet, heat exchange tubes are installed in the shell, and upper and lower tube plates for positioning the heat exchange tubes , a plurality of baffles, the baffles are single arcuate baffles, the shape is circular with a notch, the installation direction is parallel to the upper and lower tube sheets and arranged in multiple rows along the length direction of the heat exchange tubes, its The installation positions are staggered and arranged on both sides of the inner wall of the housing, and the baffles are provided with rectangular holes and heat exchange tube holes for the heat exchange tubes to pass through. The device of the utility model can significantly reduce the pressure drop of the shell side and improve the comprehensive heat transfer performance, and has a better effect of saving energy and reducing consumption.

Description

A heat exchanger in the form of baffles with rectangular holes

technical field

The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger in the form of rectangular holes in a baffle which can further strengthen the heat transfer in the shell side and reduce the pressure drop in the shell side.

Background technique

At present, the shell-and-tube heat exchangers used in industry often obtain good heat transfer effect by setting baffles on the shell side, but this structure will generate large flow resistance, increase power consumption, and the shell side will appear relatively large. The large flow dead zone leads to the reduction of local heat transfer coefficient, scaling and corrosion. However, shell-and-tube heat exchangers using single bow-shaped baffles are still widely used in oil refining, chemical and other enterprises because of their simple structure, convenient manufacturing and maintenance, high reliability, and low cost. It is practical and economical to improve or optimize the flow plate.

Based on this, it is necessary to improve the baffles to obtain a new type of high-efficiency shell-and-tube heat exchanger.

Contents of the invention

The technical problem to be solved by the utility model is to provide a baffle in the form of rectangular holes that can significantly reduce the pressure drop of the shell side and improve the comprehensive heat transfer performance, and has a better effect of energy saving and consumption reduction. Heat Exchanger.

The technical scheme that the utility model solves its technical problem adopts is:

A heat exchanger in the form of rectangular holes in the baffles, including a shell, the two ends of the shell are provided with upper and lower heads, the shell is also opened with a shell-side inlet and a tube-side inlet and outlet, and a heat exchanger is installed in the shell. The heat pipe, the upper and lower tube plates for positioning the heat exchange tubes, and multiple baffles, are characterized in that the baffles are single-bow baffles, and their shape is circular with notches, and their installation direction Parallel to the upper and lower tube plates and extending along the length of the heat exchange tubes, the installation positions are staggered and arranged on both sides of the inner wall of the shell, and the baffles are provided with rectangular holes and heat exchange tube holes for the heat exchange tubes to pass through .

In the above solution, the inlet and outlet of the shell side are arranged on the shell, and the inlet and outlet of the tube side are arranged on the upper and lower heads respectively.

In the above solution, the number of rectangular holes is smaller than the number of heat exchange tube holes.

In the above solution, the area of the rectangular hole is smaller than the area of the hole of the heat exchange tube.

In the above solution, both ends of the shell are fixedly connected to the upper and lower tube sheets, the upper and lower heads are connected to the upper and lower tube sheets, and the upper and lower ends of the heat exchange tubes are fixed on the tube sheets.

The selection principle of the opening size and quantity of the baffle with rectangular holes described in the utility model is: after opening the rectangular holes, comprehensively measure the convective heat transfer coefficient of the shell side, the heat transfer amount of the shell side, the logarithmic average temperature difference of the heat exchanger, and the shell side The change of parameters such as heat transfer and flow resistance comprehensive performance, select the best size of open rectangular hole; the principle of opening rectangular hole baffle opening layout is: analyze the heat exchanger without baffle opening, find The shell-side flow dead zone is opened at the position of the flow dead zone; the optimal opening baffle obtained by following the above two principles is conducive to enhancing the shell-side heat transfer capacity and reducing flow resistance, thereby saving energy consumption.

The working principle of the utility model is: after a proper number and diameter of rectangular holes are opened in a specific part of the baffle, a jet flow will be generated at the opening, so that the fluid will quickly form a turbulent flow after leaving the rectangular hole, and produce volumetric flow to the surrounding fluid. The suction effect, so that the shell-side fluid can achieve local turbulence at low Reynolds number, reducing or eliminating the dead zone of stagnation in the shell; in addition, opening the rectangular hole increases the longitudinal flow area of the shell-side fluid, and becomes a single bow baffle The lateral flow supported by the plate is part of the longitudinal flow perpendicular to the heat exchange tubes, thereby reducing the flow resistance of the shell side, reducing fouling and corrosion, and improving the overall heat transfer performance of the shell side to a certain extent.

The main advantages of the utility model are:

1) The use of baffles with rectangular holes can further enhance the heat transfer of the shell side, reduce the flow resistance of the shell side, and reduce fouling and corrosion compared with other forms of opening methods;

2) It is simple and easy to open rectangular holes on the baffle plate, and the cost increases little, so it has good feasibility.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a schematic diagram of the surface structure of the baffle in the embodiment of the present invention;

In the figure: 1. Upper head, 2. Tube side outlet, 3. Upper tube sheet, 4. Shell, 5. Heat exchange tube, 6. Baffle plate, 7. Shell side outlet, 8. Lower tube sheet, 9. Bottom head, 10. Tube side inlet, 11. Shell side inlet, 12. Heat exchange tube hole, 13. Rectangular hole.

Detailed ways

Below in conjunction with specific embodiment, the utility model is further described:

As shown in Figure 1 and Figure 2, the heat exchanger in the form of a rectangular hole in the baffle includes an upper head 1, a tube outlet 2, an upper tube plate 3, a shell 4, a heat exchange tube 5, and a baffle 6 , shell side outlet 7, lower tube sheet 8, lower head 9, tube side inlet 10, shell side inlet 11, the two ends of shell 4 are respectively connected with upper tube sheet 3, lower tube sheet 8, upper head 1 and The lower head 9 is connected to the upper tube sheet 3 and the lower tube sheet 8 respectively, the upper and lower ends of the heat exchange tube 5 are fixed on the upper tube sheet 3 and the lower tube sheet 8, and the baffle 6 is fixed inside the shell 4. The baffle plate 6 is a single arcuate baffle plate, its shape is circular with a notch, its installation direction is parallel to the upper tube sheet 3 and the lower tube sheet 8 and extends along the length direction of the heat exchange tube 5 in multiple rows, and its installation position Arranged alternately on both sides of the inner wall of the shell 4, the baffle 6 is provided with a rectangular hole 13 and a heat exchange tube hole 12 for the heat exchange tube 5 to pass through; the shell side inlet 11 and the shell side outlet 7 are arranged in the shell 4 On the top, the tube side inlet 10 and the tube side outlet 2 are arranged on the upper head 1 and the lower head 9 respectively.

In this embodiment, the number of the rectangular holes is smaller than the number of the heat exchange tube holes, and the area of the rectangular holes is also smaller than the area of the heat exchange tube holes.

The working process of the utility model is: the shell-side fluid enters the shell 4 from the shell-side inlet 11, and a part of the fluid passes through the rectangular hole 13 to generate a fluid jet, so that the fluid forms a turbulent flow soon after leaving the rectangular hole 13, and the fluid of the jet is The surrounding fluid produces an entrainment effect, and the shell-side fluid can achieve local turbulence at a low Reynolds number, reducing or eliminating the stagnation dead zone of shell-side flow and heat transfer; in addition, the rectangular hole 13 increases the longitudinal direction of the shell-side fluid. The flow area is changed from the lateral flow supported by the single arched baffle to the partial longitudinal flow perpendicular to the heat exchange tube, thereby reducing the flow resistance of the shell side, reducing fouling and corrosion, and improving the overall heat transfer performance of the shell side to a certain extent , another part of the fluid flows around the baffle plate 6, and the shell-side fluid flows out through the shell-side outlet 7. The tube-side fluid first enters the lower head 9 through the tube-side inlet 10 , enters the heat exchange tube 5 in the lower head 9 , then flows into the upper head 1 , and then flows out from the upper head 1 through the tube-side outlet 2 .

The above descriptions are only application examples of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, equivalent changes made according to the patent scope of the utility model still belong to the protection scope of the utility model.

Claims (5)

1. a deflection plate is driven the heat exchanger of rectangular opening form, include housing, housing two ends are provided with low head, on housing, also having shell side imports and exports, tube side is imported and exported, heat exchanger tube is installed in housing, the upper lower perforated plate that exchange heat pipe plays the role of positioning, multiple deflection plates, it is characterized in that, described deflection plate is single segmental baffle, it is shaped as notched circle, its installation direction is parallel with upper lower perforated plate and extend along the multiple arrangements of heat exchanger tube length direction, its installation site is listed in inner walls both sides staggered dividing, the heat exchange pore that has rectangular opening on deflection plate and pass for heat exchanger tube.

2. deflection plate as claimed in claim 1 is driven the heat exchanger of rectangular opening form, it is characterized in that, described shell side is imported and exported and is arranged on housing, and tube side is imported and exported and is arranged on low head.

3. deflection plate as claimed in claim 1 is driven the heat exchanger of rectangular opening form, it is characterized in that, the number of described rectangular opening is less than the number of heat exchange pore.

4. deflection plate as claimed in claim 1 is driven the heat exchanger of rectangular opening form, it is characterized in that, the area of described rectangular opening is less than the area of heat exchange pore.

5. deflection plate as claimed in claim 1 is driven the heat exchanger of rectangular opening form, it is characterized in that, described housing two ends are fixedly connected with upper lower perforated plate respectively, and upper low head is connected with upper lower perforated plate again, and the two ends up and down of heat exchanger tube are fixed on tube sheet.