Online continuous variable-area heat exchanger for teaching

Abstract

The invention discloses an online continuous variable-area heat exchanger for teaching, and relates to the technical field of heat exchangers. The online continuous variable-area heat exchanger for teaching comprises a heat exchange shell, outlet end sockets communicated with the heat exchange shell are fixedly installed on the front surface and the rear surface of the heat exchange shell, inlet end sockets communicated with the heat exchange shell are fixedly installed on the rear surface of the heat exchange shell, the outlet end sockets serve as discharging areas, the inlet end sockets serve as feeding areas, and a pipe shell is fixedly installed on the inner wall of the heat exchange shell; a plurality of baffle plates are arranged in the heat exchange shell, the tube nest of the heat exchanger adopts square tubes with the same specification, and the square tubes are tightly welded together in the direction of the tail section, so that the strength of the tube nest can be improved, the production difficulty is reduced, the continuity of the page height is further realized, and the heat exchange area is convenient to calculate due to the uniform specification; namely, the total area of the tubes participating in heat exchange can be calculated as long as the height of the liquid level of the material is known, the structure is simple, the design pressure is not changed, and air can be exhausted by adding an emptying port.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to an online continuously variable area heat exchanger for teaching. Background Art

[0002] The comprehensive utilization of energy in chemical processes has become the most active area of ​​chemical process system optimization, and is also an important aspect of achieving energy conservation and emission reduction advocated by the country, and has gradually received great attention from various universities. In addition, in chemical plants, energy-saving technology transformation is also the easiest technical improvement to achieve, and it can usually obtain great benefits from technical transformation, and is gradually recognized by chemical companies.

[0003] In order to train college chemical engineering students to understand and apply energy conservation in chemical processes and improve their intuitive understanding of chemical energy conservation, it is necessary to design a set of chemical practice equipment based on the design, implementation, and analysis of chemical process pinch point analysis. In order to have a deeper understanding of the pinch point theory to verify the different energy-saving effects of energy flow passing through the pinch point and not passing through the pinch point, designing a heat exchanger that is easy to operate and whose heat exchange area can be accurately adjusted online has become the primary issue to be solved. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an online continuously variable area heat exchanger for teaching, which can solve the problem of designing a heat exchanger that is easy to operate and whose heat exchange area can be precisely adjusted online in order to have a deeper understanding of the pinch point theory and verify the different energy-saving effects of energy flow passing through the pinch point and not passing through the pinch point.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an online continuously variable area heat exchanger for teaching, comprising a heat exchange shell;

[0006] The front and rear surfaces of the heat exchange shell are fixedly installed with outlet heads in communication therewith, and the rear surface of the heat exchange shell is fixedly installed with an inlet head in communication therewith, the outlet head is the discharge area, and the inlet head is the feed area;

[0007] The inner wall of the heat exchange shell is fixedly installed with a tube shell, a plurality of baffles are arranged inside the heat exchange shell, a plurality of tubes are arranged inside the heat exchange shell, and a heat exchange area is arranged inside the heat exchange shell;

[0008] Among them, the upper surface of the outlet head is fixedly connected with an air inlet valve in communication with it, the lower surface of the outlet head is fixedly connected with a connecting pipe in communication with it, and the front end of the connecting pipe is fixedly installed with a material outlet valve in communication with it;

[0009] Among them, materials are arranged on the heat exchange shell, the inlet head and the outlet head.

[0010] Preferably, two connecting pieces in communication with the outlet head are fixedly connected to the left side thereof, and liquid level gauges in communication with the two connecting pieces are fixedly installed on the left side thereof.

[0011] Preferably, a cold and hot medium outlet valve in communication with the heat exchange shell is fixedly mounted on the upper surface of the heat exchange shell, and a cold and hot medium inlet valve in communication with the heat exchange shell is fixedly mounted on the lower surface of the heat exchange shell.

[0012] Preferably, a material inlet valve through which material passes is fixedly mounted on the rear surface of the inlet head, a pressure gauge for detecting the pressure inside the inlet head is fixedly mounted on the upper surface of the inlet head, and an exhaust valve connected thereto is fixedly mounted on the upper surface of the inlet head.

[0013] Preferably, a protection box is provided on the lower surface of the heat exchange shell, and four slide grooves communicating with the protection box are provided on the upper surface of the protection box, and a bidirectional threaded rod is rotatably connected to the left side of the protection box.

[0014] Preferably, the right end of the bidirectional threaded rod rotates to penetrate into the interior of the protection box and is rotatably connected to the inner wall of the protection box, and the left end of the bidirectional threaded rod is fixedly connected to a circular plate.

[0015] Preferably, the outer wall of the bidirectional threaded rod is threadedly sleeved with two movable sleeves, the front and rear surfaces of the two movable sleeves are fixedly connected with connecting plates, the inner wall of the protective box is fixedly connected with two sliding rods, the outer walls of the two sliding rods are slidably connected with two sliding sleeves, and the four connecting plates are fixedly connected with the corresponding sliding sleeves.

[0016] Preferably, the upper surfaces of the four sliding sleeves are fixedly connected with sliders, the upper ends of the four sliders slide through the inner walls of the corresponding sliding grooves respectively, the upper surfaces of the two front and rear corresponding sliders are fixedly connected with fixed splints, and the lower surface of the protective box is fixedly connected with two T-shaped support legs.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The online continuously variable area heat exchanger used for teaching uses square tubes of equal specifications in the tubes, and the square tubes are tightly welded together along the direction of the last section. This not only increases the strength of the tubes and reduces the difficulty of production, but also achieves the continuity of the page height. At the same time, due to the unified specifications, it is convenient to calculate the heat exchange area, that is, as long as the material liquid level is known, the total area of ​​the tubes involved in the heat exchange can be calculated. The structure is simple, the design pressure remains unchanged, and the exhaust port is added for exhaust.

[0019] 2. The online continuously variable area heat exchanger used for teaching is filled with inert gas from the air inlet valve. The inert gas itself is also a poor conductor. The gas filled in from the top also plays a certain role in the insulation of the equipment.

[0020] 3. If the heat exchange area of ​​the online continuously variable area heat exchanger used for teaching needs to be reduced, it is only necessary to fill in inert gas from the air inlet valve. Since the gas density is less than that of the liquid, the liquid level is always below the gas, and the three areas are connected to each other, so as to ensure that the liquid levels in the three areas are the same. Therefore, the volume in the heat exchange zone can be controlled by the volume of the gas filled, thereby controlling the effective area involved in the heat exchange, and then the heat exchange area can be changed online, and the operation is convenient, thereby improving the practicality of the online continuously variable area heat exchanger used for teaching.

[0021] 4. The online continuously variable area heat exchanger used for teaching rotates the bidirectional threaded rod through a circular plate, and the bidirectional threaded rod drives two movable sleeves to move to relative positions. The two movable sleeves drive two corresponding sliding sleeves on the left and right to move to relative positions through four connecting plates. The four sliding sleeves drive two fixed clamping plates to move to relative positions through four sliders to clamp the heat exchange shell, thereby facilitating the use of the heat exchange shell in subsequent teaching and improving the stability of the online continuously variable area heat exchanger used for teaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the upper surface of the protection box of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the protection box of the present invention;

[0026] Figure 4 It is a schematic plan view of the front surface of the heat exchange shell of the present invention;

[0027] Figure 5 It is a schematic plan view of the present invention as a whole.

[0028] Figure numerals: 1. heat exchange shell; 2. cold and hot medium outlet valve; 3. air inlet valve; 4. material outlet valve; 5. outlet head; 6. connecting pipe; 7. connecting piece; 8. liquid level gauge; 9. slider; 10. protection box; 11. fixed splint; 12. circular plate; 13. T-shaped support leg; 14. slide groove; 15. cold and hot medium inlet valve; 16. material inlet valve; 17. inlet head; 18. pressure gauge; 19. exhaust valve; 20. movable sleeve; 21. two-way threaded rod; 22. slide rod; 23. material; 24. sliding sleeve; 25. connecting plate; 26. tube; 27. tube shell; 28. baffle; 29. ​​heat exchange zone. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] See also Figure 1-5 The present invention provides a technical solution: an online continuously variable area heat exchanger for teaching, comprising a heat exchange shell 1, the front and rear surfaces of the heat exchange shell 1 are fixedly installed with outlet heads 5 communicating therewith, the rear surface of the heat exchange shell 1 is fixedly installed with an inlet head 17 communicating therewith, the outlet head 5 is a discharge area, and the inlet head 17 is a feed area;

[0034] The inner wall of the heat exchange shell 1 is fixedly provided with a tube shell 27, a plurality of baffles 28 are arranged inside the heat exchange shell 1, a plurality of tube arrays 26 are arranged inside the heat exchange shell 1, and a heat exchange area 29 is arranged inside the heat exchange shell 1;

[0035] The upper surface of the outlet end cap 5 is fixedly connected with an air inlet valve 3 in communication therewith, the lower surface of the outlet end cap 5 is fixedly connected with a connecting pipe 6 in communication therewith, and the front end of the connecting pipe 6 is fixedly installed with a material outlet valve 4 in communication therewith;

[0036] The heat exchange shell 1 , the inlet head 17 and the outlet head 5 are all provided with materials 23 .

[0037] Furthermore, two connecting pieces 7 communicating with the outlet end cap 5 are fixedly connected to the left side thereof, and liquid level gauges 8 communicating with the outlet end cap 5 are fixedly installed on the left side thereof.

[0038] Furthermore, a cold and hot medium outlet valve 2 communicating therewith is fixedly mounted on the upper surface of the heat exchange shell 1 , and a cold and hot medium inlet valve 15 communicating therewith is fixedly mounted on the lower surface of the heat exchange shell 1 .

[0039] Furthermore, a material inlet valve 16 is fixedly installed on the rear surface of the inlet head 17, and a pressure gauge 18 is fixedly installed on the upper surface of the inlet head 17. The pressure gauge 18 is used to detect the pressure inside the inlet head 17, and an exhaust valve 19 is fixedly installed on the upper surface of the inlet head 17 and is connected to it.

[0040] Furthermore, a protection box 10 is disposed on the lower surface of the heat exchange shell 1 , and four slide grooves 14 communicating with the protection box 10 are opened on the upper surface thereof, and a bidirectional threaded rod 21 is rotatably connected to the left side of the protection box 10 .

[0041] Furthermore, the right end of the bidirectional threaded rod 21 rotates to penetrate into the interior of the protection box 10 and is rotatably connected to the inner wall of the protection box 10 , and the left end of the bidirectional threaded rod 21 is fixedly connected to the circular plate 12 .

[0042] Furthermore, two movable sleeves 20 are threadedly sleeved on the outer wall of the bidirectional threaded rod 21, and the front and rear surfaces of the two movable sleeves 20 are fixedly connected with connecting plates 25. The inner wall of the protective box 10 is fixedly connected with two sliding rods 22, and the outer walls of the two sliding rods 22 are slidably connected with two sliding sleeves 24. The four connecting plates 25 are fixedly connected with the corresponding sliding sleeves 24.

[0043] Furthermore, the upper surfaces of the four sliding sleeves 24 are fixedly connected with sliders 9, the upper ends of the four sliders 9 slide through the inner walls of the corresponding sliding grooves 14 respectively, the upper surfaces of the two front and rear corresponding sliders 9 are fixedly connected with fixed clamps 11, and the lower surface of the protective box 10 is fixedly connected with two T-shaped support legs 13.

[0044] Furthermore, when using the online continuously variable area heat exchanger for teaching, firstly, the protection box 10 is placed as a whole on the designated teaching position, and then the heat exchange shell 1 is placed as a whole on the upper surface of the protection box 10, so that the heat exchange shell 1 is located on the opposite surfaces of the two fixed clamping plates 11;

[0045] The bidirectional threaded rod 21 is then rotated by the circular plate 12, and the bidirectional threaded rod 21 drives the two movable sleeves 20 to move to relative positions. The two movable sleeves 20 drive the two corresponding sliding sleeves 24 on the left and right to move to relative positions through four connecting plates 25. The four sliding sleeves 24 drive the two fixed clamping plates 11 to move to relative positions through four sliding blocks 9 to clamp the heat exchange shell 1, thereby facilitating the use of the heat exchange shell 1 in subsequent teaching and improving the stability of the online continuously variable area heat exchanger used for teaching.

[0046] Among them, Figure 5 As shown, the outlet head 5, the inlet head 17 and the heat exchange shell 1 divide the heat exchanger into three parts: the feed area, the heat exchange area 29 and the discharge area;

[0047] When the heat exchanger is working, the cold and hot medium inlet valve 15 and the cold and hot medium outlet valve 2 are first connected, so that the heat exchange medium flows from the cold and hot medium inlet valve 15 into the tube shell 27, and the heat exchange medium fills the entire heat exchange area 29 through the baffle 28 and then flows out from the cold and hot medium outlet valve 2;

[0048] Then, the material inlet valve 16 is opened and the material outlet valve 4 is closed, and the liquid level of the material 23 in the heat exchanger gradually rises until the residual gas in the tube shell 27 and the inlet pressure balance liquid level stop rising. At this time, the exhaust valve 19 arranged on the inlet head 17 is slowly opened to vent the gas. At the same time, the liquid level height can be observed by the liquid level gauge 8 arranged on the outlet head 5 to determine whether all the gas is discharged;

[0049] When the gas is completely discharged, the heat exchange area of ​​the heat exchanger reaches its maximum;

[0050] If the heat exchange area needs to be reduced, it is only necessary to fill in inert gas from the air inlet valve 3. Since the density of gas is less than that of liquid, the liquid level is always below the gas, and the three areas are connected to each other, so as to ensure that the liquid levels in the three areas are the same. Therefore, the volume in the heat exchange area can be controlled by the volume of gas filled, thereby controlling the effective area involved in heat exchange, and then the heat exchange area can be changed online, and the operation is convenient, thereby improving the practicality of the online continuously variable area heat exchanger used for teaching;

[0051] Among them, by filling inert gas from the air inlet valve 3, the inert gas itself is also a poor conductor, and the gas filled in from the top also plays a certain role in the heat preservation of the equipment;

[0052] Among them, it is particularly important to emphasize that the tubes 26 of the heat exchanger are square tubes of equal specifications, and the square tubes are tightly welded together along the direction of the last section. This not only increases the strength of the tubes and reduces the difficulty of production, but also achieves the continuity of the page height. At the same time, due to the unified specifications, it is convenient to calculate the heat exchange area, that is, as long as the liquid level of the material 23 is known, the total area of ​​the tubes involved in the heat exchange can be calculated. The structure is simple, the design pressure remains unchanged, and an exhaust port is added to exhaust gas.

[0053] Working principle: When using the online continuously variable area heat exchanger for teaching, first place the protection box 10 as a whole on the designated teaching position, and then place the heat exchange shell 1 as a whole on the upper surface of the protection box 10, so that the heat exchange shell 1 is located on the opposite surfaces of the two fixed clamping plates 11;

[0054] The bidirectional threaded rod 21 is then rotated by the circular plate 12, and the bidirectional threaded rod 21 drives the two movable sleeves 20 to move to relative positions. The two movable sleeves 20 drive the two corresponding sliding sleeves 24 on the left and right to move to relative positions through four connecting plates 25. The four sliding sleeves 24 drive the two fixed clamping plates 11 to move to relative positions through four sliding blocks 9, thereby clamping the heat exchange shell 1, thereby facilitating the use of the heat exchange shell 1 in subsequent teaching.

[0055] Among them, Figure 5 As shown, the outlet head 5, the inlet head 17 and the heat exchange shell 1 divide the heat exchanger into three parts: the feed area, the heat exchange area 29 and the discharge area;

[0056] When the heat exchanger is working, the cold and hot medium inlet valve 15 and the cold and hot medium outlet valve 2 are first connected, so that the heat exchange medium flows from the cold and hot medium inlet valve 15 into the tube shell 27, and the heat exchange medium fills the entire heat exchange area 29 through the baffle 28 and then flows out from the cold and hot medium outlet valve 2;

[0057] Then, the material inlet valve 16 is opened and the material outlet valve 4 is closed, and the liquid level of the material 23 in the heat exchanger gradually rises until the residual gas in the tube shell 27 and the inlet pressure balance liquid level stop rising. At this time, the exhaust valve 19 arranged on the inlet head 17 is slowly opened to vent the gas. At the same time, the liquid level height can be observed by the liquid level gauge 8 arranged on the outlet head 5 to determine whether all the gas is discharged;

[0058] When the gas is completely discharged, the heat exchange area of ​​the heat exchanger reaches its maximum;

[0059] If the heat exchange area needs to be reduced, it is only necessary to fill in inert gas from the air inlet valve 3. Since the density of gas is less than that of liquid, the liquid level is always below the gas, and the three areas are connected to each other, so as to ensure that the liquid levels of the three areas are the same. Therefore, the volume of the heat exchange area can be controlled by the volume of the gas filled, thereby controlling the effective area involved in the heat exchange, and then the heat exchange area can be changed online, and the operation is convenient;

[0060] Among them, by filling inert gas from the air inlet valve 3, the inert gas itself is also a poor conductor, and the gas filled in from the top also plays a certain role in the heat preservation of the equipment;

[0061] Among them, it is particularly important to emphasize that the tubes 26 of the heat exchanger are square tubes of equal specifications, and the square tubes are tightly welded together along the direction of the last section. This not only increases the strength of the tubes and reduces the difficulty of production, but also achieves the continuity of the page height. At the same time, due to the unified specifications, it is convenient to calculate the heat exchange area, that is, as long as the liquid level of the material 23 is known, the total area of ​​the tubes involved in the heat exchange can be calculated. The structure is simple, the design pressure remains unchanged, and an exhaust port is added to exhaust gas.

[0062] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An online continuously variable area heat exchanger for teaching, characterized in that: include: Heat exchange shell (1); The front and rear surfaces of the heat exchange shell (1) are fixedly mounted with outlet heads (5) in communication therewith, and the rear surface of the heat exchange shell (1) is fixedly mounted with an inlet head (17) in communication therewith, the outlet head (5) being a discharge area, and the inlet head (17) being a feed area; A tube shell (27) is fixedly mounted on the inner wall of the heat exchange shell (1), a plurality of baffles (28) are arranged inside the heat exchange shell (1), a plurality of tube arrays (26) are arranged inside the heat exchange shell (1), and a heat exchange area (29) is arranged inside the heat exchange shell (1); The upper surface of the outlet end cap (5) is fixedly connected to an air inlet valve (3) in communication therewith, the lower surface of the outlet end cap (5) is fixedly connected to a connecting pipe (6) in communication therewith, and the front end of the connecting pipe (6) is fixedly mounted with a material outlet valve (4) in communication therewith; Wherein, materials (23) are arranged on the heat exchange shell (1), the inlet head (17) and the outlet head (5).

2. The online continuously variable area heat exchanger for teaching according to claim 1, characterized in that: The left side of the outlet sealing head (5) is fixedly connected to two connecting pieces (7) in communication therewith, and the left sides of the two connecting pieces (7) are fixedly installed with liquid level gauges (8) in communication therewith.

3. The online continuously variable area heat exchanger for teaching according to claim 1, characterized in that: A cold and hot medium outlet valve (2) in communication with the heat exchange shell (1) is fixedly mounted on the upper surface of the heat exchange shell (1), and a cold and hot medium inlet valve (15) in communication with the heat exchange shell (1) is fixedly mounted on the lower surface of the heat exchange shell (1).

4. The online continuously variable area heat exchanger for teaching according to claim 1, characterized in that: The rear surface of the inlet seal (17) is fixedly mounted with a material inlet valve (16) through which the material is to pass; the upper surface of the inlet seal (17) is fixedly mounted with a pressure gauge (18) for detecting the pressure inside the inlet seal (17); and the upper surface of the inlet seal (17) is fixedly mounted with an exhaust valve (19) in communication with the inlet seal.

5. The online continuously variable area heat exchanger for teaching according to claim 1, characterized in that: A protection box (10) is arranged on the lower surface of the heat exchange shell (1), and four slide grooves (14) communicating with the protection box (10) are arranged on the upper surface of the protection box (10). A bidirectional threaded rod (21) is rotatably connected to the left side of the protection box (10).

6. The online continuously variable area heat exchanger for teaching according to claim 5, characterized in that: The right end of the bidirectional threaded rod (21) rotates to penetrate into the interior of the protection box (10) and is rotatably connected to the inner wall of the protection box (10), and the left end of the bidirectional threaded rod (21) is fixedly connected to a circular plate (12).

7. The online continuously variable area heat exchanger for teaching according to claim 5, characterized in that: The outer wall of the bidirectional threaded rod (21) is threadedly sleeved with two movable sleeves (20), and the front and rear surfaces of the two movable sleeves (20) are fixedly connected with connecting plates (25). The inner wall of the protective box (10) is fixedly connected with two sliding rods (22), and the outer walls of the two sliding rods (22) are slidably connected with two sliding sleeves (24), and the four connecting plates (25) are fixedly connected with the corresponding sliding sleeves (24).

8. The online continuously variable area heat exchanger for teaching according to claim 7, characterized in that: The upper surfaces of the four sliding sleeves (24) are fixedly connected with sliders (9), the upper ends of the four sliders (9) slide through the inner walls of the corresponding sliding grooves (14) respectively, the upper surfaces of the two front and rear corresponding sliders (9) are fixedly connected with fixed clamps (11), and the lower surface of the protective box (10) is fixedly connected with two T-shaped support legs (13).

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