WO2012003603A1

WO2012003603A1 - Heat exchanger having fully-closed flow passage and continuous-type spiral baffle

Info

Publication number: WO2012003603A1
Application number: PCT/CN2010/001023
Authority: WO
Inventors: 程治方; 路辉
Original assignee: Cheng Zhifang; Lu Hui
Priority date: 2010-07-06
Filing date: 2010-07-09
Publication date: 2012-01-12
Also published as: CN102313467A

Abstract

A heat exchanger having fully-closed flow passage and continuous-type spiral baffle includes a baffle (1), a connecting plate (2), a heat transfer tube (3), a shell (4), tube plates (5) positioned at two ends of the shell respectively and an inlet and outlet tube (6). The baffle (1) has a sector shape. Two or more baffles (1) continue and constitute a circular section in one spiral stroke, wherein each baffle is connected to the adjacent baffle by the connecting plate (2). A spiral angle between the baffle (1) and the connecting plate (2) is larger than 0 degree and smaller than 90 degree. The heat exchanger has characteristics of low vibration, easy manufacturing and so on.

Description

Fully enclosed flow path continuous spiral baffle heat exchanger

The invention relates to a shell-and-tube heat exchanger used in oil refining, chemical, electric power, metallurgy, light industry, medicine, food and other industries, in particular to a fully enclosed flow channel continuous type central tube spiral baffle heat exchanger Device. Background technique

The industrialized spiral baffle heat exchangers that are popular in the world are first proposed by the former Czechoslovak National Institute of Chemical Equipment scientists Jay Luca and Jennimkensky in the early 1990s. The characteristic is that the flow of the shell-side medium is in the form of a spiral plow, and the basic shape of the baffle is a fan shape, each baffle forms a certain angle with the axis of the casing, and the adjacent baffles are connected end to end. A continuous spiral similar to the outer circumference, thereby changing the flow state of the shell-side fluid to improve the heat transfer efficiency, and relatively reducing the damage caused by the tube bundle due to vibration, thereby improving the service life of the heat exchanger. The application results show that the use of a spiral baffle structure for the shell side has the advantage of reducing the pressure drop of the shell side fluid compared to the vertical bow baffle structure. The experimental results show that for the compressed air as the working medium, under the same Reynolds number Re, the outer tube heat transfer coefficient of the smooth tube spiral baffle heat exchanger is a smooth tube bow-shaped separator heat exchanger 1. 25-1 8倍, The heat transfer coefficient of the spiral baffle heat exchanger can be up to 1.39 times of the arcuate baffle heat exchanger, and the pressure drop can be reduced by about 26% -60% depending on the helix angle. The heat exchanger of the spiral baffle support structure has anti-scaling characteristics, and is suitable for enhanced heat transfer of easily fouling and high-viscosity media such as crude oil and residual oil, but specific to each heat exchanger, its heat transfer efficiency is further There are different.

At present, there are more than 30 patents related to spiral baffle tube-and-tube heat exchangers that have been declared in China, which are generally divided into two types: non-continuous spiral baffle structure and continuous spiral baffle structure. The structural characteristics of the discontinuous spiral baffle heat exchanger are as follows: A fan-shaped baffle of 2-4 quarter-shell cross-section is used to form an approximate spiral surface, intermittently from the shell inlet to the outlet. At the point of advancement, experiments have shown that this type of heat exchanger spiral baffle can make the shell side fluid flow in an approximate spiral, and the heat transfer capacity per unit pressure drop is improved relative to the bow baffle. However, it is precisely because the fan-shaped baffles are placed end to end in a certain angle with the shell axis, and the straight edges of the adjacent two baffles are staggered at the top to reveal a very obvious gap, resulting in a very obvious gap. The shell-side medium forms a short-circuit leakage between the two baffles. The actual test proves that if the heat exchanger has a diameter of more than 1000 mm or the heat exchange area exceeds 2000 square meters, the heat transfer characteristics may not be as good as the bow baffle structure. The structural characteristics of the continuous spiral baffle heat exchanger are: The baffle is similar to the common 蛟 dragon that transports the solid phase medium, and its shape can be a full spiral surface propelled from the inlet of the casing to the outlet, so that the medium is made in the casing. To a relatively continuous smooth rotating flow, but the baffle can not cover the shell center area of the shell, a central tube is needed as an auxiliary structure to compensate for the heat transfer loss, thereby deriving a variety of double helix or double shell structure, but Such spiral baffle heat exchangers are generally fixed by fixing the baffles to the central pipe or directly to the central pipe. However, in actual production, there may be thousands of heat transfer pipes, so the appearance of the central pipe It not only squeezes the space of the heat transfer tube, but also is very complicated and difficult to manufacture in production and processing, which brings difficulties to further enlargement and popularization of the product, and also reduces the heat transfer efficiency of the heat exchanger.

The domestic manufacturing industry generally believes that the difficulty in the promotion of spiral baffle heat exchangers is to solve the manufacturing problem, because the existing non-continuous spiral baffle structure uses the distance tube positioning to fix the heat transfer tubes, but this situation is difficult to manufacture. It is often larger than the ordinary bow baffle structure. The existing continuation type spiral baffle structure is more difficult to manufacture because it is fixed on the center tube. If the processing of the spiral baffle heat exchanger is established on the numerical control machine tool and the special tool, the product is popularized and applied. The effect is even worse. In addition, the vibration induced by the medium fluid in the working state causes the heat exchanger tube to vibrate. The vibration damage of the vertical bow baffle tube-and-tube heat exchanger is an important problem affecting the long-term operation of the heat exchanger. The situation has to stop using, and even replace the new equipment, increasing the production cost of the enterprise.

Patent No. ZL 200820117711. 7 The utility model patent entitled "Assembled Continuous Type Spiral Baffle Heat Exchanger" discloses "a type of assembled continuous spiral baffle heat exchanger, which consists of a main structure, a baffle, The coupling plate and the heat transfer tube are characterized in that: the baffle plate has a fan shape, and one straight side is connected with the joint plate at an angle of 90°, and the other straight side of the same circular cross section is shaped as a fan-shaped baffle. It is connected with the connecting plate of the adjacent baffle to form a sealed spiral passage that advances from the inlet of the shell."; However, the utility model patent "the straight side of one side is connected with the joint plate at an angle of 90°" in actual production. The process is very difficult and difficult to control. In addition, the utility model patent proposes that "the baffle is at an angle to the axis of the casing", and the actual implementation proves that: the angle between the baffle and the axis of the casing is only In the range of "8°~35°", the heat transfer efficiency is the most significant; in addition, the joint plate in the utility model patent is actually a non-independent approximate isosceles triangle, but is partially shaped by a nearly right triangle. Composition, manufacturing of great difficulty, is not conducive to extensive promotion. Summary of the invention

The object of the present invention is to provide a fully enclosed flow path continuous type central tube spiral baffle heat exchanger according to the above drawbacks of the prior art; the heat exchange device is advantageous for reducing vibration, easy to manufacture, and favorable for The product is further enlarged and promoted and applied.

The invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, comprising a baffle plate, a coupling plate, a heat transfer tube, a casing, a tube plate at both ends of the casing, and inlet and outlet pipes, Wherein the baffles are fan-shaped, in a spiral stroke, two or more baffles continuously form a circular cross section, wherein each baffle is connected with an adjacent baffle by a connecting plate, the baffle Forming a helix angle greater than zero and less than 90° with the coupling plate; in the casing, a plurality of baffles form a complete circular section within a helical stroke, ie, become a spiral waveform group, and several spiral waveform groups Connection by the coupling plate: a sealing spiral passage formed from the inlet of the shell to the outlet and formed together with the inner wall of the casing and the outer wall of the heat transfer tube.

The invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, wherein the joint plate has an approximately isosceles triangle shape, and a bottom edge thereof is connected with a baffle plate adjacent to a lower stroke of the joint plate, and the joint plate is additionally Stroke on both sides and on the adjacent plate The baffles are connected; the size of the coupling plate and the angle between the two sides of the coupling plate except the bottom edge are formed by the baffle angle of the approximate spiral 蛟, that is, the length and the radius of the circle being stretched by the center of the circle The triangle area is ok.

The present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, the baffle plate and the housing axis

A helix angle of 8° to 35°.

The present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, the baffle plate is provided with a through hole for a heat transfer tube to pass therethrough, and the heat transfer tube passes through the baffle The through holes are vertically fixed to the tube sheets at both ends of the housing.

The invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, wherein one heat transfer tube of N*2 in the heat exchanger passes through a through hole and two tubes on the baffle The board is fixed vertically.

The fully enclosed flow path continuous type central tube spiral baffle heat exchanger provided by the invention has N*2 times the number N of the spiral path of the shell side of the heat exchanger in the same circular cross section.

The present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger. After the heat transfer tube passes through the baffles of the same quadrant, the joint plate and the joint plate are sequentially connected to form a bundle group, and the bundles of the quadrants The group forms a sealed spiral passage that advances from the inlet of the shell to the outlet through the baffle connection panel.

The present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, wherein the number of the tube bundle groups is N*2 times the number N of the shell side spiral passages of the heat exchanger.

The invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, wherein the inlet and outlet pipes are disposed at one end of the heat exchanger or on both sides of one of the tube plates at both ends of the casing.

The invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger, wherein the baffle plate and the joint plate are made of a metal material.

The above technical solutions and their design:

Wherein, the inner wall of the casing, the baffle plate, the coupling plate and the outer wall of the heat transfer tube together form a sealing spiral passage; the connection of the baffle plate and the coupling plate can advertise the manner of welding, and can also pass other connection modes having the same effect as welding; The technical materials used for the baffles and the joint plates may be copper or stainless steel.

The baffle plate is connected with the coupling plate and the design of the screw angle between the baffle plate and the coupling plate is less than 90°, which not only makes the fixing between the baffles and the baffle plate and the heat transfer tube more stable, but also enhances The feasibility of the overall heat exchanger processing greatly reduces the difficulty in actual manufacturing; in addition, the joint plate is approximately isosceles triangle: not only blocks the leakage phenomenon of the triangle; but the introduction of the coupling plate makes the flow to the shell The substance exerts a thrust effect, so that a true spiral flow can be formed inside the shell-side, which can effectively improve the heat transfer performance per unit pressure drop, and the joint plate is approximately isosceles triangle instead of adopting a separate right-angled triangle stitching manner, so that the spiral The manufacture of baffle heat exchangers has become much easier.

In addition, the present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger without using a central tube The way, that is, the space in the casing is saved, the capacity of the material to be heat exchange is increased, and the spiral angle of the baffle plate and the coupling plate is opened, so that a true spiral flow path appears in the heat exchange process, and the spiral The full closure of the flow channel greatly increases the flow velocity of the medium, and the Reynolds number is also increased from the perspective of heat transfer calculation, and the convective heat transfer coefficient α can also be greatly improved, thereby greatly improving the heat transfer efficiency.

The heat exchanger provided by the invention can also pre-constitute the tube bundle group when necessary, and the pre-assembled four (six, eight...) triangular tube bundles can be prepared according to the number of housing steps required by the product during the tube-passing process of the heat transfer tube. Groups, connected by corresponding joint plates and then guided by tube sheets or other process equipment for overall assembly, can greatly shorten the assembly and reduce the manufacturing cost.

Compared with the prior art, the present invention provides a fully enclosed flow path continuous type central tube spiral baffle heat exchanger having the following advantages:

1. Form a truly closed spiral flow path:

1), the medium flow in the spiral channel at high speed is beneficial to wash away particles and sediments in the shell process, which significantly reduces the thermal resistance of the dirt, because the thermal resistance of the dirt accounts for 50%-70% of the total thermal resistance, effectively helping to improve Heat exchange efficiency;

2), to help form a high-speed spiral flow, a velocity gradient field appears in the shell-side cross-section, and the velocity gradient field not only causes each heat-exchange tube to be in the vortex of the heat exchange medium, causing the boundary layer of the heat exchange tube to be thinned The resistance is reduced, and the resulting centrifugal force increases the degree of turbulence of the fluid.

2. It is beneficial to reduce vibration, reduce the possibility of equipment loss, extend the service life of the equipment, and save cost: From the structure, the support length of the heat exchanger to the bundle is completely average, and the triangular joint plate will spiral the whole process. The baffle plate is connected as a whole structure, which completely solves the problem of tube bundle vibration damage: Due to the flow state of the spiral baffle heat exchanger shell medium, a large vortex flow is formed in the casing, and the physical characteristics of the vortex are vortex. The flow velocity at the center is much larger than the edge portion; the principle that the heat transfer effect of the central portion of a spiral baffle heat exchanger is better than that of other parts is also here. The large flow velocity at the center portion means that the vibration damage is the most dangerous point. The triangular baffle between the fan-shaped baffles in the high-efficiency closed continuous spiral baffle heat exchanger happens to form this much-needed reinforcement, which forms an ultra-stable structure, further strengthening the anti-vibration of the heat exchanger tube bundle. The ability to extend the service life of the equipment, under the strong load pressure of the industry, saves costs and brings great convenience to production.

3, easy to manufacture, convenient for large-scale processing:

In the manufacturing process, the triangular joint plate passing through the central axis is supported by 90° cross-section. Since the joint plate and the baffle are respectively triangular and fan-shaped planar structures, the two sides of the spiral baffle and the joint plate are The three side connections are more stable and easy to machine and assemble.

4. It is easier to achieve larger size than various spiral baffle heat exchangers on the market.

5. The heat transfer efficiency can be increased by 30%-180%. 6. The omission of the center tube reduces the manufacturing cost accordingly.

7. The improvement of heat transfer efficiency expands the scope of application and can bring huge economic benefits to the enterprise and create considerable commercial value.

8. Solving the problem of leakage current short circuit of the spiral baffle heat exchanger that people have been eager to solve. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the overall structure of a fully enclosed flow path continuous type centerless tube spiral baffle heat exchanger.

2 is a schematic view showing the connection relationship between a fully enclosed flow path continuous type centerless tube spiral baffle and a connecting plate provided by the present invention.

In the figure: 1, baffle; 2, the joint plate; 3, heat transfer tube; 4, the shell; 5, the tube plate at both ends of the shell; 6, the inlet and outlet tubes. detailed description

[Embodiment 1]

As shown in Figure 1-2: This embodiment is a two-way spiral channel fully enclosed flow path continuous type central tube spiral baffle heat exchanger, from baffle 1, coupling plate 2, heat transfer tube 3 a casing 4, a tube plate 5 at both ends of the casing, and an inlet and outlet pipe 6 at one end of the casing 4, wherein the upper portion is an inlet pipe and the lower portion is an outlet pipe: material enters from the inlet pipe, in the shell After heat exchange in the process, it flows out from the outlet pipe. The baffle 1 is made of ordinary carbon steel, and the baffle 1 has a quarter-circle shape. In one spiral stroke, the four baffles 1 continuously form a circular section, wherein each baffle 1 and phase The adjacent baffles 1 are connected by a joint plate 2, that is, the joint plate 2 has an approximately isosceles triangle, and the bottom edge thereof is connected with the baffle 1 immediately below the joint plate 2, and the other two sides of the joint plate 2 are adjacent to the joint plate 2 The upper baffles 1 are connected, and the baffle 1 and the coupling plate 2 form a 70° helical angle; the size of the coupling plate 2 and the angle between the two sides of the coupling plate 2 except the bottom edge are The baffle 1 is defined by a chamfer angle of the approximate spiral 蛟, that is, a triangle formed by the length of the center of the circle and the radius of the spiral.

The coupling plate 2 has an approximately isosceles triangle shape and the connection relationship between the coupling plate 2 and the baffle plate 1 so that after the substance enters the casing, the thrust of the coupling plate 2 will flow forward in the direction of the spiral flow, thereby avoiding leakage. Phenomenon, and improved heat exchange performance, improved heat transfer efficiency; In addition, the occurrence of the joint plate 2, combined with the heat transfer tube 3 through the through hole in the baffle 1, so that the integral baffle 1 in the heat exchanger shell The fixing in the body 4 is more firm and reduces the vibration loss of the device, prolonging the service life, and the coupling plate 2 is a separate approximate isosceles triangle which is easier to manufacture by splicing in a right triangle.

Each baffle 1 has an 8° helix angle with the axis of the housing 4, and a plurality of baffles 1 advance from the inlet of the shell to the outlet. That is, the splicing of the approximate spiral surface is formed. The relationship between the number of baffles 1 on the same circular cross section and the number N of heat exchanger shell paths is N*2, and the number of baffles of the single pass heat exchanger is usually four. A through hole for the passage of the heat transfer tube 3 is disposed on the spiral baffle 1, and the heat transfer tube 3 passes through the through hole on the spiral baffle 1 and is vertically fixed to the two tube sheets 5 at both ends of the heat exchanger, and heat transfer is performed. After the tube 3 passes through the plurality of baffles 1 of the same quadrant, the connecting plates 2 are sequentially connected to form a tube bundle group, and the tube bundle groups of the respective quadrants form a sealing spiral propelled from the inlet of the shell to the outlet through the baffle connection group plate. The channel is assembled into a spiral baffle heat exchanger with a fully enclosed spiral flow path under the guidance of the tube head 5 and the tube ends at both ends of the heat exchanger and other process equipment.

In addition, since the heat exchanger of the embodiment does not have a center tube, and the baffle plate 1 and the heat transfer tube 3 are connected and fixed, the distance tube structure is not required, thereby greatly reducing the manufacturing difficulty and cost, and is an industrial promotion belt. It is very convenient. In addition, according to a large number of heat transfer test results, the heat transfer efficiency of the heat exchanger of the present embodiment is 30% higher than that of the conventional bow baffle heat exchanger, and has better economic and social benefits of energy saving and emission reduction.

[Embodiment 2]

As shown in Fig. 1 to 2, this embodiment is a three-pass spiral channel fully enclosed flow path continuous type central tube spiral baffle heat exchanger, which is assembled by six tube bundle groups. The baffle plate 1, the coupling plate 2, the heat transfer tube 3, the casing 4, the tube plate 5 at both ends of the casing, and the inlet and outlet pipes 6 at one end of the casing 4, wherein the upper portion is an inlet pipe, located at Below is the outlet pipe: The material enters from the inlet pipe and flows out of the outlet pipe after heat exchange in the shell process. The baffle 1 is made of stainless steel, and the baffle 1 has a one-sixth circular sector. In one spiral stroke, six baffles 1 continuously form a circular section, wherein each baffle 1 and adjacent folds The flow plates 1 are connected by a joint plate 1, that is, the joint plate 2 has an approximately isosceles triangle shape, and the bottom edge thereof is connected to the baffle plate 1 immediately below the joint plate 2, and the other two sides of the joint plate 2 are adjacent to the joint plate 2 The baffles 1 are connected, and the baffle 1 and the coupling plate 2 form a 40° helical angle; the size of the coupling plate 2 and the angle between the two sides of the coupling plate 2 except the bottom edge are baffles The plate 1 is determined by the angle of rotation of the approximate spiral 蛟, that is, the triangle formed by the length of the center of the circle and the radius of the spiral.

The coupling plate 2 has an approximately isosceles triangle shape and the connection relationship between the coupling plate 2 and the baffle plate 1 so that after the substance enters the casing, the thrust of the coupling plate 2 will flow forward in the direction of the spiral flow, thereby avoiding leakage. Phenomenon, and greatly reduce the phenomenon of fouling or short circuit of some materials in the baffle 1 near the casing 4, effectively improve the heat exchange performance, improve the heat transfer efficiency; In addition, the appearance of the joint plate 2, combined with heat transfer The tube 3 passes through the through hole in the baffle 1, so that the fixing of the integral baffle 1 in the heat exchanger housing 4 is more firm and the vibration loss of the device is reduced, and the service life is prolonged, and the coupling plate 2 is an independent approximation. Isosceles triangles are easier to machine than by splicing with right triangles.

Each baffle 1 and the axis of the casing 4 have a helix angle of 35°, and a plurality of baffles 1 are advanced from the inlet of the shell to the outlet, that is, a splicing of an approximately spiral surface is formed, and the baffles 1 of the same circular cross section are formed. The relationship between the number of tubes and the number of shell paths of the heat exchanger is N*2, and the number of baffles of the single-pass heat exchanger is usually four. A through hole for the passage of the heat transfer tube 3 is provided on the spiral baffle 1 The heat transfer tube 3 passes through the through hole on the spiral baffle 1 and is vertically fixed to the two tube sheets 5 at both ends of the heat exchanger, and the heat transfer tube 3 passes through the same quadrant of the turret 1 and the joint plate 2 Connected to form a tube bundle group in turn, the tube bundle group of each quadrant forms a sealed spiral passage from the shell inlet to the outlet through the baffle connection group plate; the tube head and other processes at the tube plate 5 and the heat exchanger Under the guidance of the equipment, it is assembled into a spiral baffle heat exchanger with a fully enclosed spiral flow path.

In addition, since the heat exchanger of the embodiment does not have a center tube, and the baffle plate 1 and the heat transfer tube 3 are connected and fixed, the distance tube structure is not required, thereby greatly reducing the manufacturing difficulty and cost, and is an industrial promotion belt. It is very convenient. In addition, according to a large number of heat transfer test results, the heat transfer efficiency of the heat exchanger of the present embodiment is improved by 180% compared with the conventional bow baffle heat exchanger, and has good economic and social benefits of energy saving and emission reduction.

[Embodiment 3]

As shown in Figure 1-2: This embodiment is a two-way spiral channel fully enclosed flow path continuous type central tube spiral baffle heat exchanger, from baffle 1, coupling plate 2, heat transfer tube 3 The casing 4, the tube plate 5 at both ends of the casing, and the inlet and outlet pipes 6 at one end of the casing, wherein the upper part is the inlet pipe and the lower part is the outlet pipe: the material enters from the inlet pipe, and is changed in the shell process. After the heat, it flows out from the outlet pipe. The baffle 1 is made of stainless steel, and the baffle 1 has a one-sixth circular sector. In one spiral stroke, the four baffles 1 continuously form a circular cross section, wherein each baffle 1 and adjacent folds The flow plates 1 are connected by a joint plate 2, that is, the joint plate 2 has an approximately isosceles triangle shape, and the bottom edge thereof is connected to the baffle 1 immediately below the joint plate 2, and the other two sides of the joint plate 2 are adjacent to the joint plate 2 The baffles 1 are connected, and the baffle 1 forms a 70° angle with the coupling plate 2; the size of the coupling plate 2 and the angle between the two sides of the coupling plate 2 except the bottom edge are baffles The plate 1 is determined by the angle of rotation of the approximate spiral 蛟, that is, the triangle formed by the length of the center of the circle and the radius of the spiral.

The coupling plate 2 has an approximately isosceles triangle shape and the connection relationship between the coupling plate 2 and the baffle plate 1 so that after the substance enters the casing, the thrust of the coupling plate 2 will flow forward in the direction of the spiral flow, thereby avoiding leakage. Phenomenon, and improved heat exchange performance, improved heat transfer efficiency; In addition, the occurrence of the joint plate 2, combined with the heat transfer tube 3 through the through hole in the baffle 1, so that the integral baffle 1 in the heat exchanger shell The fixing in the body 4 is more robust and reduces the vibration loss of the device, prolonging the service life, and the coupling plate is independent of the approximate isosceles triangle ratio and is easier to manufacture by splicing in a right triangle.

Each baffle 1 has a 10° helix angle with the axis of the casing 4, and a plurality of baffles 1 are advanced from the inlet of the shell to the outlet, that is, a splicing of an approximately spiral surface is formed, and the baffles 1 of the same circular cross section are formed. The relationship between the number of tubes and the number of shell paths of the heat exchanger is N*2, and the number of baffles of the single-pass heat exchanger is usually four. A through hole for the passage of the heat transfer tube 3 is disposed on the spiral baffle 1, and the heat transfer tube 3 passes through the through hole on the spiral baffle 1 and is vertically fixed to the two tube sheets 5 at both ends of the heat exchanger, and heat transfer is performed. After the tube 3 passes through the plurality of baffles 1 of the same quadrant, the connecting plates 2 are sequentially connected to form a tube bundle group, and the tube bundle groups of the respective quadrants form a sealing spiral propelled from the inlet of the shell to the outlet through the baffle connection group plate. The channel is assembled into a spiral baffle heat exchanger with a fully enclosed spiral flow path under the guidance of the tube head 5 and the tube ends at both ends of the heat exchanger and other process equipment. In addition, since the heat exchanger of the embodiment does not have a center tube, and the baffle plate 1 and the heat transfer tube 3 are connected and fixed, the distance tube structure is not required, thereby greatly reducing the manufacturing difficulty and cost, and is an industrial promotion belt. It is very convenient. In addition, according to a large number of heat transfer test results, the heat transfer efficiency of the heat exchanger of the present embodiment is improved by 150% compared with the conventional bow baffle heat exchanger, and has good economic and social benefits of energy saving and emission reduction.

[Example 4].

As shown in Fig. 1 to 2, the present embodiment is a three-way spiral channel fully enclosed flow path continuous type central tube spiral baffle heat exchanger, which is assembled by 8 tube bundle groups. The baffle plate 1, the coupling plate 2, the heat transfer tube 3, the casing 4, the tube plate 5 at both ends of the casing, and the inlet and outlet pipes 6 at one end of the casing 4, wherein the upper portion is an inlet pipe, located at Below is the outlet pipe: The material enters from the inlet pipe and flows out of the outlet pipe after heat exchange in the shell process. The baffle 1 is made of ordinary carbon steel, and the baffle 1 has a one-sixth circular sector. In one spiral stroke, six baffles 1 continuously form a circular cross section, wherein each baffle 1 and phase The adjacent baffles 1 are connected by a joint plate 2, that is, the joint plate 2 has an approximately isosceles triangle, and the bottom edge thereof is connected with the baffle 1 immediately below the joint plate 2, and the other two sides of the joint plate 2 are adjacent to the joint plate 2 The upper baffles 1 are connected, and the baffle 1 and the coupling plate 2 form a 20° helical angle; the size of the coupling plate 2 and the angle between the two sides of the coupling plate 2 except the bottom edge are The baffle 1 is defined by a chamfer angle of the approximate spiral 蛟, that is, a triangle formed by the length of the center of the circle and the radius of the spiral.

The coupling plate 2 has an approximately isosceles triangle shape and the connection relationship between the coupling plate 2 and the baffle plate 1 so that after the material enters the casing, the thrust of the coupling plate 2 will flow forward in the direction of the spiral flow, thereby avoiding leakage. Phenomenon, and greatly reduce the phenomenon of fouling or short circuit of some materials in the baffle 1 near the casing 4, effectively improve the heat exchange performance, improve the heat transfer efficiency; In addition, the appearance of the joint plate 2, combined with heat transfer The tube 3 passes through the through hole in the baffle 1, so that the fixing of the integral baffle 1 in the heat exchanger housing 4 is more firm and the vibration loss of the device is reduced, the service life is prolonged, and the joint plate is an independent approximation or the like. The waist triangle is easier to machine than by splicing in a right triangle.

Each baffle 1 has a 20° helix angle with the axis of the housing 4, and a plurality of baffles 1 are advanced from the inlet of the shell to the outlet, forming a splicing of approximately spiral faces, and baffles 1 of the same circular cross section. The relationship between the number of tubes and the number of shell paths of the heat exchanger is N*2, and the number of baffles of the single-pass heat exchanger is usually four. A through hole for the passage of the heat transfer tube 3 is disposed on the spiral baffle 1, and the heat transfer tube 3 passes through the through hole on the spiral baffle 1 and is vertically fixed to the two tube sheets 5 at both ends of the heat exchanger, and heat transfer is performed. After the tube 3 passes through the plurality of baffles 1 of the same quadrant, the connecting plates 2 are sequentially connected to form a tube bundle group, and the tube bundle groups of the respective quadrants form a sealing spiral propelled from the inlet of the shell to the outlet through the baffle connection group plate. The channel is assembled into a spiral baffle heat exchanger with a fully enclosed spiral flow path under the guidance of the tube head 5 and the tube ends at both ends of the heat exchanger and other process equipment.

In addition, since the heat exchanger of the embodiment does not have a center tube, and the baffle plate 1 and the heat transfer tube 3 are connected and fixed, the distance tube structure is not required, thereby greatly reducing the manufacturing difficulty and cost, and is an industrial promotion belt. It is very convenient. In addition, According to a large number of heat transfer test results, the heat transfer efficiency of the heat exchanger of the present embodiment is improved by 120% compared with the conventional bow baffle heat exchanger, and has good economic and social benefits of energy saving and emission reduction.

Finally, it should be noted that the above embodiments are only used to explain the technical solutions of the present invention and are not limited thereto. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that: The invention may be modified or equivalently modified without departing from the scope of the invention as set forth in the appended claims.

Claims

Rights request

1. A fully enclosed flow path continuous type central tube spiral baffle heat exchanger comprising a baffle (1), a coupling plate (2), a heat transfer tube (3), a casing (4), a casing a tube sheet (5) at both ends and an inlet and outlet tube (6) characterized by the baffle. (1)

- fan-shaped, in a spiral stroke, two or more baffles (1) continuously form a circular section, wherein each baffle (1) and the adjacent baffle (1) are connected by a joint plate ( 2) Connection, the angle between the baffle (1) and the coupling plate (2) is greater than zero and less than 90°; in the casing (4), several baffles (1) are within one spiral stroke , forming a complete circular section, that is, a spiral waveform group, if the thousand spiral waveform group is connected by the coupling plate (2): formed from the shell inlet to the outlet, and the inner wall of the casing (4) and heat transfer The sealed spiral channel formed by the outer wall of the tube (3).

2. A heat exchanger according to claim 1, characterized in that said coupling plate (2) is of an approximately isosceles triangle, the bottom edge of which is connected to a baffle (1) which is adjacent to the lower stroke of the coupling plate (2). The other two sides of the coupling plate (2) are connected to the baffle (1) which is adjacent to the upper stroke of the coupling plate (2); the size of the coupling plate (2) and the angle between the two sides of the coupling plate (2) except the bottom edge The baffle (1) is determined by the angle of the spiral of the approximate spiral 蛟, that is, the triangle formed by the length of the center of the circle and the radius of the spiral.

The heat exchanger according to claim 1, characterized in that the baffle (1) is at 8° to the axis of the casing (4)~

A helix angle of 35°.

4. The heat exchanger according to claim 1, characterized in that the baffle (1) is provided with a through hole through which the heat transfer tube (3) passes, and the heat transfer tube (3) passes through The through holes in the baffle (1) are vertically fixed to the tube sheets (5) at both ends of the housing.

5. The heat exchanger according to claim 1, characterized in that N*2 of the heat transfer tubes in the heat exchanger pass through the through holes and the two tube sheets on the baffle (1) (5) Vertically fixed.

6. A heat exchanger according to claim 1, characterized in that the number of baffles (2) in the same circular cross section is N*2 times the number N of spiral paths of the shell side of the heat exchanger.

7. The heat exchanger according to claim 1, characterized in that the heat transfer tube (3) passes through the baffles (1) of the same quadrant, and is connected in series with the coupling plate (2) to form a tube bundle group. The bundle of tubes in each quadrant forms a sealed spiral passage that advances from the inlet of the shell to the outlet through the baffle connection panel.

The heat exchanger according to claim 6, wherein the number of the tube bundle groups is N*2 times the number of spiral passages N of the heat exchanger shell.

The heat exchanger according to claim 1, characterized in that the inlet and outlet pipes (6) are provided at one end of the heat exchanger or on both sides of one of the tube sheets (5) at both ends of the casing.

10. A heat exchanger according to claim 6, characterized in that the baffle (1) and the coupling plate (2) are made of a metal material.