Mixed reaction device of shell-and-tube heat exchanger tube box

Abstract

The invention discloses a mixed reaction device of a shell-and-tube heat exchanger tube box, which belongs to the technical field of chemical heat exchange equipment and comprises a tank horizontally mounted on the side of the heat exchanger tube box, and a gas-phase material inlet tube and a liquid-phase material inlet tube are mounted on the side wall of the tank. Two baffle plates, two perforated baffle plates and a buffer baffle plate are arranged in the tank body, the two baffle plates are positioned between the two perforated baffle plates, and the buffer baffle plate is mounted on one side close to the heat exchanger tube box. According to the mixed reaction device of the tube box of the shell-and-tube heat exchanger, two or more strands of materials enter the tank body through the baffle plate, the perforated baffle plate and the buffer baffle plate which are specially designed in the tank body, are fully mixed and then are fully reacted through the baffle plate, the perforated baffle plate and the buffer baffle plate; and then entering the shell side of the heat exchanger to exchange heat with a shell pass cold (hot) medium, so that a series of problems such as tube bundle pull-off, tube bundle thinning, non-uniform mixing and incomplete conversion are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical heat exchange equipment, and in particular relates to a mixing reaction device of a tube box of a shell and tube heat exchanger. Background Art

[0002] In the field of chemical industry and material processing, material reaction and heat exchange are two crucial process links. At present, most of the material reaction and heat exchange are carried out in two different equipment devices. Multiple equipment devices will increase the comprehensive cost of equipment and personnel and cause more consumption. However, the same equipment device will cause the following problems: 1. First, if the heat released during the reaction is not properly controlled, it may be too intense, causing thermal shock to downstream equipment, leading to equipment expansion, damage to welding areas, and even causing serious problems such as tube bundle shedding; 2. Secondly, the strong reaction heat scouring effect will accelerate the wear of the heat exchanger tube bundle and shorten the service life of the equipment; 3. Finally, if the reaction materials cannot be evenly mixed in a single device, it will directly affect the conversion rate of the reaction, causing some materials to fail to effectively participate in the reaction, thereby reducing the overall process efficiency and resource utilization.

[0003] To this end, we propose a mixed reaction device of a shell and tube heat exchanger tube box to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and propose a mixing reaction device for a tube box of a shell and tube heat exchanger.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A mixing reaction device for a tube box of a shell and tube heat exchanger comprises a tank body horizontally installed on the side of the heat exchanger tube box, a gas-phase material inlet pipe and a liquid-phase material inlet pipe are installed on the side wall of the tank body, and two baffles, two perforated baffles and a buffer baffle are arranged in the tank body, the two baffles are located between the two perforated baffles, and the buffer baffle is installed close to the side of the heat exchanger tube box; a gas-liquid mixing structure is arranged in the tank body, the gas-liquid mixing structure corresponds to the installation position of the gas-phase material inlet pipe and the liquid-phase material inlet pipe, and the gas-liquid mixing structure is driven by the density difference between the gas-phase material and the liquid-phase material, and is used for initial mixing with the gas-phase material and the liquid-phase material.

[0006] Furthermore, the gas-liquid mixing structure includes two parallel annular plates, which are connected by a plurality of equidistantly distributed connecting shafts, the connecting shafts are rotatably connected to the annular plates, an arc plate is fixedly arranged on the connecting shafts, the arc plate fits the annular plates, and a deflection limiting mechanism is arranged between the movable end of the arc plate and the annular plate.

[0007] Furthermore, the deflection limiting mechanism includes a limiting shaft fixedly arranged on the movable end of the arc plate, a limiting groove is provided on the annular plate, the limiting shaft is located in the limiting groove, and the limiting groove is in an arc shape with the axis of the connecting shaft as the center.

[0008] Furthermore, the gas-phase material inlet pipe is installed below the tank body, and the liquid-phase material inlet pipe is installed above the tank body. The gas-phase material inlet pipe and the liquid-phase material inlet pipe are both installed vertically along the tangent direction of the tank body.

[0009] Furthermore, there is a baffle opening between the baffle plate and the inner wall of the tank body, and the baffle openings of the two baffle plates are staggered up and down.

[0010] Furthermore, the edge of the perforated baffle is fixed to the inner wall of the tank body, and a plurality of small holes distributed sparsely at the top and densely at the bottom are formed on the perforated baffle.

[0011] Furthermore, the buffer baffle is installed on the lower side of the tank body, an overflow port is formed above the buffer baffle, and evenly distributed overflow holes are opened on the buffer baffle.

[0012] The present invention has the following beneficial technical effects: The mixing reaction device of the tube box of the shell and tube heat exchanger passes through the baffles, perforated baffles and buffer baffles specially designed inside the tank body. Two or more streams of materials enter the tank body, are fully mixed, and then fully react through the baffles, perforated baffles and buffer baffles, and then enter the shell side of the heat exchanger to exchange heat with the shell side cold (hot) medium. By arranging the mixing reaction device on the tube side of the heat exchanger, the reaction device is built into the tube box, and the reaction and heat exchange are organically combined, so that the materials are mixed more fully, the reaction time is increased, and the conversion rate and reaction effect are improved, and a series of problems such as tube bundle pulling off, tube bundle thinning, uneven mixing and incomplete conversion are solved.

[0013] The invention provides a plurality of small holes in a sparse upper and dense lower distribution on the perforated baffle plate for one-time mixing to achieve heat balance and material balance, thereby solving the adverse effects of thermal reaction on tube sheet welding and tube bundle pulling off.

[0014] The baffle openings of the two baffles of the present invention are staggered up and down, and the two baffles are arranged to flow from bottom to top, which is conducive to the full reaction of the materials. The liquid phase material flows from bottom to top through the first baffle and continues to mix and react with the gas phase material flowing out of the second baffle. The mixed material and the new reacted material reach the lower part along the second baffle, and are secondary mixed through the turbulent effect of the two baffles, which can reduce the intensity of the reaction, average the reaction rate, and make the reaction gentle and orderly.

[0015] The present invention forms an overflow port above the buffer baffle, and the buffer baffle is provided with evenly distributed overflow holes, through which the material passing through the buffer baffle can be prevented from directly scouring the heat exchange tube, and a part of the material flows around to the upper side, so that the material passes through the tube sheet more evenly and enters the shell side for heat exchange.

[0016] The mixing reaction device of the tube box of the shell and tube heat exchanger is provided with a gas-liquid mixing structure, and uses the density difference between the gas phase material and the liquid phase material as a driving force, so that the input gas phase material and the liquid phase material can achieve preliminary and efficient mixing, increase the reaction time, and further improve the conversion rate and reaction effect. In addition, the passive drive mode can effectively save equipment expenditure, has a simple structure and low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the gas-liquid mixing structure in the present invention.

[0021] Figure 5 It is a schematic structural diagram of the working principle of the gas-liquid mixing structure in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the curved plate in the present invention.

[0023] The meanings of the accompanying numbers are as follows: 1. Tank body; 11. Gaseous material inlet pipe; 12. Liquid material inlet pipe; 13. Side liquid material connecting pipe; 2. Baffle; 3. Opening baffle; 31. Small hole; 4. Buffer baffle; 41. Overflow hole; 5. Gas-liquid mixing structure; 51. Annular plate; 52. Connecting shaft; 53. Arc plate; 54. Limiting shaft; 55. Limiting groove; 6. Safety valve; 7. Drain port. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings.

[0025] like Figure 1-3 A mixing reaction device of a tube box of a shell and tube heat exchanger comprises a tank body 1 horizontally installed on the side of the tube box of the heat exchanger, and a gas phase material inlet pipe 11 and a liquid phase material inlet pipe 12 are installed on the side wall of the tank body 1.

[0026] like Figure 1-3The gas-phase material inlet pipe 11 is installed at the bottom of the tank body 1, and the liquid-phase material inlet pipe 12 is installed at the top of the tank body 1. The gas-phase material inlet pipe 11 and the liquid-phase material inlet pipe 12 are both installed vertically along the tangent direction of the tank body 1. Since the density of the liquid-phase material is much greater than that of the gas-phase material, the liquid-phase material moves downward and the gas-phase material moves upward, so that the gas-phase material enters downward and the liquid-phase material enters upward. At the same time, a side liquid-phase material connecting pipe 13 is provided at the head end of the tank body 1. The side liquid-phase material connecting pipe 13 allows the liquid-phase material to enter the tank body 1 through a certain amount of impact, thereby creating a local vacuum, which is more conducive to mixing.

[0027] Two baffles 2, two perforated baffles 3 and a buffer baffle 4 are arranged in the tank body 1. The two baffles 2 are located between the two perforated baffles 3. The edges of the perforated baffles 3 are fixed to the inner wall of the tank body 1. The buffer baffle 4 is installed on the side close to the heat exchanger tube box. After the material enters, it is first mixed by the first perforated baffle 3a, and then the mixed material passes through the two baffles 2 and is mixed for the second time through the turbulence effect of the two baffles 2, which can reduce the intensity of the reaction and average the reaction rate. Subsequently, it passes through the perforated baffle 3 again. The second perforated baffle 3b is also a whole piece. The small holes 31 on the second perforated baffle 3b are also distributed sparsely at the top and densely at the bottom. The main purpose is to mix three times, so that the unreacted materials can react fully, further improve the conversion rate, and make the materials converted completely. Finally, it passes through the buffer baffle 4. The overflow hole 41 can prevent the material passing through the buffer baffle 4 from directly flushing the heat exchange tube, and a part of the material flows around to the upper side, so that the material can pass through the tube sheet more evenly and enter the shell side for heat exchange.

[0028] In order to ensure the safety of the reaction, the temperature difference between two or more streams of materials cannot be too large, otherwise a large amount of heat will be generated, posing a threat to the safe operation of the equipment. The equipment is provided with a safety valve 6 and a drain port 7 to ensure safe and stable operation of the equipment.

[0029] like Figure 4-6 A gas-liquid mixing structure 5 is provided in the tank body 1. The gas-liquid mixing structure 5 corresponds to the installation positions of the gas-phase material inlet pipe 11 and the liquid-phase material inlet pipe 12. The gas-liquid mixing structure 5 is driven by the density difference between the gas-phase material and the liquid-phase material, and is used for initial mixing with the gas-phase material and the liquid-phase material.

[0030] like Figure 4-6The gas-liquid mixing structure 5 includes two parallel annular plates 51, which are connected by a plurality of equidistantly distributed connecting shafts 52. The connecting shafts 52 are rotatably connected to the annular plates 51. An arc plate 53 is fixedly arranged on the connecting shaft 52. The arc plate 53 can form a coaxial state with the annular plates 51. In the coaxial state, the arc plate 53 is close to the inner wall of the tank body 1, and the arc plate 53 fits the annular plates 51. The arc plate 53 can be deflected so that a cavity is formed between the arc plate 53 and the two annular plates 51, and a deflection limiting mechanism is provided between the movable end of the arc plate 53 and the annular plates 51. Under the action of the deflection limiting mechanism, the deflection range of the arc plate 53 is limited to not exceeding the annular plates 51. The arc plate 53 located at the top will deflect downward to the limit position under the action of gravity to form a cavity. When the material is input, it moves downward along the tangent direction of the tank body 1 through the liquid material inlet pipe 12, enters the cavity, and impacts the arc plate 53. At the same time, the downward pressure caused by the liquid material on the arc plate 53 in the cavity causes the annular plate 51 to start rotating, and the liquid material will cover the arc plate 53 located below. The gas material inlet pipe 11 is arranged at a central symmetrical position of the liquid material inlet pipe 12. After the gas material enters, bubbles are generated in the liquid material and under the action of the buoyancy of the bubbles, the arc plate 53 is pushed to overcome gravity and deflect upward, which is consistent with the direction of the force of the liquid material on the annular plate 51, driving the annular plate 51 to rotate continuously, promoting the initial and efficient mixing of the gas and liquid materials, increasing the reaction time, and thereby improving the conversion rate and reaction effect. In addition, the passive drive method can effectively save equipment expenditure, has a simple structure, and low maintenance cost.

[0031] A discharge port is provided on the annular plate 51 near the side of the perforated baffle 3 to discharge gas and liquid materials from the cavity, thereby preventing the materials from being unable to be discharged from the cavity for a long time.

[0032] The deflection limiting mechanism includes a limiting shaft 54 ​​fixedly arranged at the movable end of the arc plate 53, and a limiting groove 55 is provided on the annular plate 51. The limiting shaft 54 ​​is located in the limiting groove 55, and the limiting groove 55 is an arc with the axis of the connecting shaft 52 as the center. The limiting shaft 54 ​​slides in the limiting groove 55 and stops when reaching the limit position of the limiting groove 55, which is the limit position of the deflection of the arc plate 53.

[0033] The working principle of the present invention is as follows: During use, gaseous materials enter through the gaseous material inlet pipe 11 and liquid materials enter through the liquid material inlet pipe 12. The arc plate 53 located above will be deflected downward to the limit position under the action of gravity to form a cavity. When the liquid material is input, it moves downward along the tangent direction of the tank body 1 through the liquid material inlet pipe 12, enters the cavity, and impacts the arc plate 53. At the same time, the downward pressure caused by the liquid material on the arc plate 53 in the cavity causes the annular plate 51 to start rotating, and the liquid material will cover the arc plate 53 located below. The gaseous material inlet pipe 11 is arranged at a central symmetrical position of the liquid material inlet pipe 12. After the gaseous material enters, bubbles are generated in the liquid material and under the action of the buoyancy of the bubbles, the arc plate 53 is pushed to overcome gravity and deflect upward, which is consistent with the direction of the force of the liquid material on the annular plate 51, driving the annular plate 51 to rotate continuously, thereby promoting the initial and efficient mixing of the gas and liquid materials.

[0034] After the material enters, it first passes through the first perforated baffle 3a, and is mixed once through the small holes 31 opened on the perforated baffle 3a to achieve thermal equilibrium and material balance. Then the mixed material passes through two baffles 2, and the liquid material flows from the first baffle 2a from bottom to top and continues to mix and react with the gaseous material flowing out of the second baffle 2b. The mixed material and the new reacted material reach the lower part along the second baffle 2b, and are mixed twice through the turbulent effect of the two baffles 2, which can reduce the intensity of the reaction, average the reaction rate, and make the reaction gentle and orderly. Then, it passes through the perforated baffle 3 again. The main purpose is to mix three times, so that the material that has not yet reacted can react fully, further improve the conversion rate, and make the material converted completely. Finally, it passes through the buffer baffle 4. The overflow hole 41 can prevent the material passing through the buffer baffle 4 from directly scouring the heat exchange tube, and a part of the material flows around to the upper side, so that the material passes through the tube sheet more evenly into the shell side for heat exchange.

Claims

1. A mixing reaction device for a tube box of a shell and tube heat exchanger, comprising a tank body (1) horizontally mounted on the side of the tube box of the heat exchanger, characterized in that: The side wall of the tank body (1) is provided with a gas-phase material inlet pipe (11) and a liquid-phase material inlet pipe (12), and two baffles (2), two perforated baffles (3) and a buffer baffle (4) are arranged in the tank body (1), the two baffles (2) are located between the two perforated baffles (3), and the buffer baffle (4) is installed on a side close to the heat exchanger tube box; a gas-liquid mixing structure (5) is arranged in the tank body (1), the gas-liquid mixing structure (5) corresponds to the installation position of the gas-phase material inlet pipe (11) and the liquid-phase material inlet pipe (12), and the gas-liquid mixing structure (5) is used for initial mixing with the gas-phase material and the liquid-phase material.

2. The mixed reaction device of a shell and tube heat exchanger tube box according to claim 1, characterized in that: A baffle opening is provided between the baffle plate (2) and the inner wall of the tank body (1), and the baffle openings of the two baffle plates (2) are arranged in an up-and-down staggered manner.

3. The mixed reaction device of a tube box of a shell and tube heat exchanger according to claim 2, characterized in that: The edge of the perforated baffle plate (3) is fixed to the inner wall of the tank body (1), and a plurality of small holes (31) which are sparse at the top and dense at the bottom are formed on the perforated baffle plate (3).

4. The mixed reaction device of a tube box of a shell and tube heat exchanger according to claim 3 is characterized in that: The buffer baffle (4) is installed on the lower side of the tank body (1), and an overflow port is formed above the buffer baffle (4). The buffer baffle (4) is provided with evenly distributed overflow holes (41).

5. A mixed reaction device for a tube box of a shell and tube heat exchanger according to claim 1 or 4, characterized in that: The gas-liquid mixing structure (5) comprises two annular plates (51) arranged in parallel, the two annular plates (51) being connected via a plurality of equidistantly distributed connecting shafts (52), the connecting shafts (52) being rotatably connected to the annular plates (51), an arc-shaped plate (53) being fixedly arranged on the connecting shafts (52), the arc-shaped plate (53) being in contact with the annular plates (51), and a deflection limiting mechanism being arranged between the movable end of the arc-shaped plate (53) and the annular plates (51).

6. The mixed reaction device of a tube box of a shell and tube heat exchanger according to claim 5, characterized in that: The deflection limiting mechanism comprises a limiting shaft (54) fixedly arranged at the movable end of the arc plate (53); a limiting groove (55) is provided on the annular plate (51); the limiting shaft (54) is located in the limiting groove (55); and the limiting groove (55) is in the shape of an arc with the axis of the connecting shaft (52) as the center.

7. The mixed reaction device of a tube box of a shell and tube heat exchanger according to claim 1, characterized in that: The gas-phase material inlet pipe (11) is installed below the tank body (1), and the liquid-phase material inlet pipe (12) is installed above the tank body (1). The gas-phase material inlet pipe (11) and the liquid-phase material inlet pipe (12) are both installed vertically along the tangent direction of the tank body (1).

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