Shell side impingement plate of shell-and-tube heat exchanger and shell-and-tube heat exchanger

Abstract

The utility model discloses a shell pass impingement plate of a shell-and-tube heat exchanger, which is an arc-shaped steel plate, the arc-shaped steel plate and a shell of the shell-and-tube heat exchanger are arranged in a concentric circle, and the arc-shaped steel plate is welded and fixed on the inner wall of the shell through a tie bar plate; and long circular holes are uniformly distributed on the arc-shaped steel plate. When the hole is 30 mm, the fluid distribution of the shell pass of the heat exchanger is more uniform, the heat exchange efficiency is improved, and the inlet temperature of the shell pass is reduced by 4.2 DEG C on the premise of ensuring that the inlet and outlet temperatures of the tube pass are consistent. And meanwhile, direct scouring of fluid to the impingement plate is relieved, and vibration is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of shell and tube heat exchanger, specifically relates to a shell and tube heat exchanger shell side anti -impact plate and shell and tube heat exchanger. BACKGROUND

[0002] In the design process of the shell and tube heat exchanger, the anti -impact plate as an indispensable auxiliary element, its core purpose is effectively prevent fluid direct impact heat exchange pipe, thereby avoid heat exchange tube to suffer from corrosion, wear and tear and unnecessary vibration, ensure the long -term stable operation of heat exchanger and prolong the service life.

[0003] The more common anti -impact plate design on the market adopts the flat plate structure. Although this structure can realize the anti -impact effect to a certain extent, its inherent design defects are also obvious. Specifically, the flat plate type anti -impact plate completely changes the initial flow direction of fluid, causes the short circuit of fluid between the anti -impact plate and the tube bundle, and the serious flow deviation phenomenon around the anti -impact plate, and these factors greatly reduce the heat exchange efficiency of the heat exchanger.

[0004] In addition, the flat plate type anti -impact plate will produce a large resistance drop when the fluid flows, increase the flow resistance of the fluid. Especially under the severe impact of high -speed fluid, the flat plate type anti -impact plate is prone to vibration, deformation and even falling off, which not only affects the normal operation of the heat exchanger, but also can further damage the equipment.

[0005] Patent document CN110749227A discloses a novel heat exchanger anti -impact plate, a shell side cylinder is arranged at the lower end of the tube plate, heat exchange pipes are symmetrically arranged on the inner side of the shell side cylinder, anti -impact rods are symmetrically arranged on the side of the heat exchange pipes away from the shell side cylinder, an anti -impact rod is arranged between the two symmetrically arranged anti -impact rods at the lower end of the tube plate, an anti -impact plate is arranged at the lower end of the anti -impact rod, a baffle plate is arranged at the lower end of the anti -impact plate, and a medium inlet is further arranged on one side of the shell side cylinder. Although the patent can prevent the direct impact of the shell side fluid on the heat exchange pipe, it cannot solve the abnormal conditions such as fluid short circuit and flow deviation. SUMMARY

[0006] In order to overcome the defects of the prior art, the utility model provides a shell and tube heat exchanger shell side anti -impact plate,

[0007] The purpose of realizing the flow field and strengthening heat transfer is achieved.

[0008] The technical solution of the utility model is as follows:

[0009] The utility model provides a kind of shell side baffle of shell-and-tube heat exchanger, its characterized in that: the baffle is arc steel plate, the arc steel plate and the shell of shell-and-tube heat exchanger are concentric circle setting, and by lacing rib plate welding fixed in the inner wall of the shell;Uniformly distributed with long circle type opening on the arc steel plate.

[0010] Preferably, the long circle type opening is uniformly distributed along the surface of the arc steel plate to guide the uniform distribution of the fluid, reduce the number of backflow eddies behind the baffle, and reduce the eddy size of the fluid convergence site at the bottom of the cylinder.

[0011] Preferably, the size and distribution of the long circle type opening are such that the cross-sectional maximum flow rate changes little with the increase of the opening size, and the flow field distribution behind the baffle is uniform.

[0012] Preferably, the length of the long circle type opening is 30 mm, and the spacing is 120 mm.

[0013] Preferably, the arc of the baffle is 60°, which ensures that the landing point of the high flow rate area at both ends of the baffle is offset towards the center of the cylinder.

[0014] Preferably, the size and distribution of the long circle type opening are such that when the length of the long circle type opening is 30 mm, the cross-sectional maximum flow rate changes little, and the flow field distribution behind the baffle is uniform.

[0015] The utility model also provides a kind of shell-and-tube heat exchanger, including shell and the tube bundle being set in the shell, its characterized in that, still include the above-mentioned shell side baffle structure being installed in the shell.

[0016] The shell side baffle structure is welded and fixed with the inner wall of the shell by setting the lacing rib plate inside the shell, to ensure that the baffle remains stable under fluid impact.

[0017] The tube bundle is set to cooperate with the shell side baffle, so that the fluid can flow uniformly through the tube bundle after passing through the baffle, improving the heat exchange efficiency.

[0018] The heat exchanger also includes an inlet and an outlet, wherein the inlet is arranged in front of the shell side baffle to guide the fluid into the heat exchanger, and the outlet is arranged at the other end of the shell to discharge the heat-exchanged fluid.

[0019] The shell, tube bundle and shell side baffle of the heat exchanger are made of corrosion-resistant materials to improve the service life and adaptability of the heat exchanger.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1) The utility model discloses a curved multi-hole type baffle plate is improved from the plane non-opening type baffle plate, can effectively relieve the abnormal situation of fluid short circuit, deflection flow etc. behind the plate, increase the effective heat exchange area of heat exchanger, to improve the target of heat exchanger thermal efficiency.

[0022] 2) The arc structure of the baffle plate has the effect of guiding flow, makes the falling point of the high flow rate area of the both ends edge of the plate offset to the center of the cylinder, reduces the fluid flow rate at the edge of the cylinder wall, effectively relieves the short circuit phenomenon between the left tube plate and the first baffle plate.

[0023] 3) The number of backflow eddies of the fluid behind the baffle plate colliding with the heat exchange tube is reduced, the uniformity of the overall fluid distribution in the shell is improved, and the size of the eddy at the fluid confluence position at the bottom of the cylinder is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure diagram of the baffle plate of the shell side of the shell-and-tube heat exchanger of the utility model;

[0025] Figure 2 It is the use state diagram of the baffle plate of the shell side of the shell-and-tube heat exchanger of the utility model, wherein a is the left view, and b is the front view.

[0026] Figure 3 It is the cross-section velocity nephogram at the inlet of the heat exchanger, wherein a is non-opening, b is opening 30mm, and (c) is opening 50mm.

[0027] Figure 4 It is the cross-section velocity vector diagram at the inlet of the heat exchanger, wherein a is non-opening, b is opening 30mm, and (c) is opening 50mm.

[0028] Figure 5 It is the cross-section turbulent kinetic energy distribution nephogram at the inlet of the heat exchanger, wherein a is non-opening, b is opening 30mm, and (c) is opening 50mm.

[0029] Figure 6 It is the temperature distribution nephogram of the tube side of the heat exchanger

[0030] Figure 7 It is the wall surface temperature distribution nephogram of the shell side of the heat exchanger, wherein a is A surface, b is B surface, (c) is C surface, and d is D surface. DETAILED DESCRIPTION

[0031] The technical scheme of the utility model will be further described below in combination with the drawings and examples, but should not be limited to the protection scope of the utility model by this.

[0032] Please refer to Figure 1 , Figure 1The utility model discloses a structure diagram of shell side baffle of shell and tube heat exchanger, as shown in drawing, a shell and tube heat exchanger shell side baffle, the baffle is arc steel sheet 1, the arc steel sheet with the shell of shell and tube heat exchanger is concentric circle setting, and through the pull bar plate welding fixed in the inner wall of the shell, the arc steel sheet evenly has long circle type opening 2.

[0033] The size and distribution of the long circle type opening are designed to make the cross-section highest flow velocity change little with the increase of the opening size, but the uniformity of the flow field distribution behind the baffle is improved, and the area of the flow dead zone is reduced. The arc structure has a flow guiding effect, so that the falling points of the high flow velocity area at the edges of the baffle are offset to the center of the cylinder, the fluid flow velocity at the edges of the cylinder wall is reduced, and the short circuit phenomenon between the left tube plate and the first baffle is effectively alleviated.

[0034] The utility model discloses a structure diagram of shell side baffle of shell and tube heat exchanger, as shown in drawing, a shell and tube heat exchanger shell side baffle, the baffle is arc steel sheet 1, the arc steel sheet with the shell of shell and tube heat exchanger is concentric circle setting, and through the pull bar plate welding fixed in the inner wall of the shell, the arc steel sheet evenly has long circle type opening 2. Figure 3 The utility model discloses a structure diagram of shell side baffle of shell and tube heat exchanger, as shown in drawing, a shell and tube heat exchanger shell side baffle, the baffle is arc steel sheet 1, the arc steel sheet with the shell of shell and tube heat exchanger is concentric circle setting, and through the pull bar plate welding fixed in the inner wall of the shell, the arc steel sheet evenly has long circle type opening 2.

[0035] Heat exchanger flow field analysis under different baffle structures:

[0036] As shown in Figure 4 The velocity nephogram of the cross-section at the shell inlet under different opening sizes can be seen, with the increase of the opening size, the cross-section highest flow velocity changes little, and is about 38m / s, but the uniformity of the flow field distribution behind the baffle is improved, and the area of the flow dead zone is reduced. In addition, due to the flow guiding effect of the arc structure of the baffle, the falling points of the high flow velocity area at the edges of the baffle are offset to the center of the cylinder, so that the fluid flow velocity at the edges of the cylinder wall is reduced, and the short circuit phenomenon between the left tube plate and the first baffle is effectively alleviated.

[0037] AsFigure 5 The velocity cloud of the cross section at the inlet of the shell side under different opening sizes is shown. It can be seen that, compared with the original structure, the flow field distribution of the shell side tends to be uniform, and the short circuit phenomenon is obviously improved. After the structure of the baffle is changed, the number of backflow eddies of the fluid behind the baffle colliding with the heat exchange tube is reduced. Moreover, due to the improvement of the uniformity of the overall fluid distribution in the shell side, the size of the eddy at the fluid convergence position at the bottom of the cylinder is also reduced.

[0038] As shown in Figure 6 The turbulent kinetic energy distribution cloud of the cross section at the inlet of the shell side under different opening sizes is shown. It can be seen that, after the structure of the baffle is changed, the turbulent kinetic energy distribution of the fluid in the shell side tends to be uniform, and the turbulent kinetic energy behind the baffle and at the fluid convergence position at the bottom of the cylinder is obviously reduced.

[0039] Analysis of the temperature field of the heat exchanger under different baffle structures:

[0040] Under the premise of ensuring that the inlet and outlet temperatures of the tube side of the heat exchanger are basically the same, the required inlet temperature of the shell side under different opening sizes is calculated using the CFD simulation software, and the results are shown in Table 1. It can be seen that, after the structure of the baffle is changed, the heat exchange efficiency of the heat exchanger is also improved. When the opening is 30 mm, the inlet temperature of the shell side is 227℃, which can achieve the heating effect of the tube side raw gas when the inlet temperature of the shell side without opening is 231.2℃. As shown in Figure 6 and 7 The tube side temperature cloud and the shell side wall temperature distribution cloud when the opening is 30 mm are shown.

[0041] Table 1 CFD simulation results under different opening sizes

[0042]

[0043] In summary, by changing the type of the baffle to an arc shape and opening holes on the surface of the baffle, firstly, the fluid distribution behind the baffle can be changed, and the contact between the heat exchange tube and the medium is strengthened, so that the heat exchange effect is more sufficient. Secondly, the flow area can be increased. The long circular holes opened on the baffle can increase the flow area of a part of the inlet area, while avoiding the formation of dead zones in the rear part of the baffle, causing local overheating of the heat exchange tube bundle. The fluid entering the shell passes through the throttling effect of the opening of the baffle, reducing the energy loss of a part of the fluid. Thirdly, the vibration problem related to the baffle can be alleviated. According to the maintenance records of the device, the baffle of the heat exchanger has been detached several times. Through the improvement of the structure of the baffle as described above, such problems can be effectively reduced or avoided from occurring again.

Claims

1. A tube and shell heat exchanger shell side impingement plate, characterized by, The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger.

2. The tube and shell heat exchanger shell-side impingement baffle of claim 1, wherein: The application relates to a shell-side anti-collision baffle for a tubular heat exchanger.

3. A shell and tube heat exchanger comprising a shell and a tube bundle disposed within the shell, characterised in that, The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger.

4. The shell and tube heat exchanger of claim 3, wherein: The application relates to a shell-side anti-collision baffle for a tubular heat exchanger.

5. The shell and tube heat exchanger of claim 4, wherein: The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger. The application relates to a shell-side anti-collision baffle for a tubular heat exchanger.

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