Flow temperature controllable shell and tube heat exchanger

Abstract

The application discloses a flow temperature controllable shell and tube heat exchanger, which comprises a shell, a heat exchange unit, an electric control valve, a temperature sensor and a control unit. The liquid inlet is located at the bottom end of the shell, and the liquid outlet is located at the top end of the shell. The heat exchange unit is detachably installed in the shell. The electric control valve is installed on the liquid outlet. The temperature sensor is installed on the surface of the shell, and the temperature measurement end of the temperature sensor extends into the shell. The control unit is installed on the surface of the shell, and the heat exchange unit, the electric control valve and the temperature sensor are connected with the control unit. The liquid temperature is monitored in real time by the temperature sensor, and the liquid flow of the liquid outlet is adjusted by adjusting the opening of the electric control valve.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to a shell-and-tube heat exchanger with controllable flow rate and temperature. Background Technology

[0002] Shell-and-tube heat exchangers, also known as tubular heat exchangers, are indirect heat exchangers that use the walls of tube bundles enclosed in a shell as the heat transfer surface. They extend in one direction in the form of tubes, forming a structure that facilitates heat exchange between heated water and high-temperature gas within the shell. When gas heated by a heat source and heated water flow on opposite sides of the heat exchange boundary, the heated water is heated by receiving heat from the gas. This type of heat exchanger is simple in structure, low in cost, has a wide flow cross-section, and is easy to clean of scale; however, it has a low heat transfer coefficient and a large footprint. It can be manufactured using various structural materials (mainly metals) and can be used at high temperatures and pressures, making it the most widely used type. Shell-and-tube heat exchangers are widely used in chemical plants, for example, as preheaters or water heaters, recovering heat from the effluent of the exothermic conversion section to generate steam; other applications include start-up heaters for ammonia reactors.

[0003] In the prior art, patent CN105518408 B discloses a shell-and-tube heat exchanger that, by setting copper sealing elements, prevents water corrosion of the aluminum outer tubes, simplifies the manufacturing process, and minimizes the possibility of coolant and water leakage. Patent CN110914628 B discloses a shell-and-tube heat exchanger that prevents or reduces vaporization or temperature cross-contamination in at least a portion of the tube bundle and can always operate under stable and effective conditions. Patent CN111164356 B discloses a shell-and-tube heat exchanger that can reduce the area of ​​stagnant flow regions, improve heat transfer efficiency, and, when passing through the main baffle, may cause heated water to flow around the flue, enabling effective heat exchange between the heated water and the flue. Patent CN111886469 B discloses a shell-and-tube heat exchanger that replaces two devices with a single device, reducing the cost of the base and increasing the compactness of the device, lowering the cost and complexity of the heat recovery sections of the preheater and water heater, while maintaining the design flexibility of two separate devices. Patent CN109186283 A discloses a shell-and-tube heat exchanger with a small ratio of shell volume to heat exchange area. It can use air or low-viscosity liquid as the heat exchange medium. The entire process is free of dead zones, short circuits, and turbulence. It can perform coaxial reverse heat exchange with the tube-side cold medium at the maximum temperature gradient. In addition, it can be opened and closed, and facilitates physical descaling and cleaning of the shell and tube sides.

[0004] However, none of the aforementioned shell-and-tube heat exchanger technologies possess the function of dual flow and temperature control, thus failing to maximize the utilization of thermal energy. Therefore, it is necessary to design a new type of shell-and-tube heat exchanger with dual flow and temperature control functions, which is more precise and intelligent, maximizing thermal efficiency and saving energy. Summary of the Invention

[0005] To achieve the above objectives, the present invention discloses a shell-and-tube heat exchanger with controllable flow rate and temperature, comprising:

[0006] The housing has an inlet located at the bottom and an outlet located at the top.

[0007] A heat exchange unit, wherein the heat exchange unit is detachably installed within the housing;

[0008] An electrically controlled valve is installed on the liquid outlet;

[0009] A temperature sensor is mounted on the surface of the housing, and the temperature measuring end of the temperature sensor extends into the housing.

[0010] The control unit is mounted on the surface of the housing, and the heat exchange unit, the electrically controlled valve, and the temperature sensor are all connected to the control unit.

[0011] Preferably, the housing is vertically arranged, and a support foot is installed at the bottom of the housing.

[0012] Preferably, the shell surface has a refrigerant inlet and a refrigerant outlet for connection with the heat exchange unit.

[0013] Preferably, the bottom end of the housing is tapered near the liquid inlet, and the bottom end of the housing is connected to the housing body via a mating flange.

[0014] Preferably, the heat exchange unit includes:

[0015] A spiral coil is located inside the housing, and both the refrigerant inlet and refrigerant outlet are connected to the spiral coil.

[0016] An upper fixed plate is installed inside the top of the housing, and the spiral coil is connected to the upper fixed plate;

[0017] The four vertical columns are circumferentially mounted on the upper fixed plate with the spiral coil as the center.

[0018] The upper filter box is located at the end of the spiral coil away from the upper fixed plate, and the opening end of the upper filter box is oriented towards the liquid inlet.

[0019] Mounting bases, four of which are circumferentially mounted on the side of the upper filter box, and the vertical column is disposed through the mounting bases at the end away from the upper fixing plate;

[0020] A filter hole 1, and several filter holes 1 are distributed on the inner wall of the upper filter box;

[0021] A filter screen, which is placed inside the upper filter box;

[0022] The lower filter box is located at the end of the upper filter box away from the spiral coil. The opening of the lower filter box faces towards the liquid inlet, and the bottom of the lower filter box abuts against the opening of the upper filter box.

[0023] Filter hole two, a plurality of filter holes two are distributed at the bottom end of the lower filter box;

[0024] A conical liquid inlet cylinder is located at the end of the lower filter box away from the upper filter box. The small-diameter end of the conical liquid inlet cylinder extends into the opening of the lower filter box, and the large-diameter end of the conical liquid inlet cylinder abuts against the bottom of the housing. The liquid inlet is connected to the inside of the conical liquid inlet cylinder.

[0025] Preferably, the heat exchange unit further includes:

[0026] Card block storage slots, multiple card block storage slots are circumferentially opened at the side end of the lower filter box near the bottom end of the box;

[0027] Card block, the card block is installed in the card block storage slot;

[0028] A reset spring is installed in the card block storage slot and is connected between the bottom end of the card block storage slot and the card block.

[0029] An annular fastening groove is installed at the opening end of the upper filter box, and the locking block, located away from the reset spring end, is locked inside the annular fastening groove.

[0030] Preferably, a limiting top ring is installed on the vertical column, and the limiting top ring is adapted to the mounting base.

[0031] Preferably, the surface of the shell is covered with a heat insulation layer.

[0032] The working principle and beneficial effects of this invention are as follows:

[0033] (1) This invention discloses a shell-and-tube heat exchanger with controllable flow rate and temperature. Liquid is fed into the shell through the inlet, exchanges heat with the heat exchange unit located inside the shell, and then discharges from the outlet. A temperature sensor installed on the shell is used to monitor the liquid temperature in real time, and the opening of the electrically controlled valve installed on the outlet is adjustable, thereby adjusting the flow rate of the liquid discharged from the outlet. In this invention, the user inputs preset temperature and flow rate values ​​into the terminal. The control unit uploads the liquid temperature data monitored in real time by the temperature sensor and the liquid flow rate data discharged from the outlet to the terminal. Based on the preset temperature and flow rate values, the terminal changes the power of the heat exchange unit and the opening of the electrically controlled valve through the control unit.

[0034] (2) This invention discloses a shell-and-tube heat exchanger with controllable flow rate and temperature. Liquid is fed into the shell from the inlet located at the bottom of the shell. The liquid enters the conical inlet cylinder, the lower filter box and the upper filter box in sequence. The conical inlet cylinder guides the liquid into the lower filter box. After the lower filter box completes the primary filtration of the liquid, the filter screen on the inner wall of the upper filter box completes the secondary filtration of the liquid, thereby reducing the accumulation of impurities in the shell, preventing the accumulation of dirt on the spiral coil, and improving the service life of the spiral coil.

[0035] (3) When the spiral coil needs maintenance, after the housing is laid flat, remove the bottom of the housing, release the conical inlet cylinder from its limiting position on the lower filter box, and take out and clean the lower filter box and the upper filter box in sequence. Lift the vertical column with both hands and pull out the upper fixed plate connected to the vertical column and the spiral coil installed on the upper fixed plate. Clean the surface of the spiral coil. After cleaning, hold the spiral coil and send it into the housing near the upper fixed plate. Then put in the upper filter box (note the fit between the mounting base and the vertical column) and the lower filter box in sequence. Send the small diameter end of the conical inlet cylinder into the lower filter box. After installing the bottom of the housing, use the bottom of the housing to hold the large diameter end of the conical inlet cylinder, thereby realizing the limiting position of the conical inlet cylinder on the lower filter box. Straighten the housing. Attached Figure Description

[0036] To more clearly illustrate the technical solution of the present invention, the drawings used in the specific patent technology description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a control principle diagram of the present invention;

[0039] Figure 3This is a schematic diagram of the heat exchange unit structure in this invention;

[0040] Figure 4 for Figure 3 Enlarged view of number A;

[0041] Figure 5 This is a three-dimensional view of the interior of the housing in this invention.

[0042] In the diagram: 1. Shell; 2. Heat exchange unit; 11. Liquid inlet; 12. Liquid outlet; 13. Electrically controlled valve; 14. Temperature sensor; 15. Control unit; 16. Refrigerant inlet; 17. Refrigerant outlet; 18. Annular fastening groove; 21. Spiral coil; 22. Upper fixing plate; 23. Vertical column; 24. Upper filter box; 25. Mounting base; 26. Lower filter box; 27. Conical liquid inlet cylinder; 28. Locking block storage groove; 29. ​​Locking block; 20. Return spring. Detailed Implementation

[0043] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example

[0045] The present invention will now be further described with reference to the accompanying drawings.

[0046] (1) As Figure 1 , Figure 2 As shown, this embodiment provides a shell-and-tube heat exchanger with controllable flow rate and temperature, comprising:

[0047] The housing 1 has an inlet 11 located at the bottom and an outlet 12 located at the top. A heat exchange unit 2 is detachably installed inside the housing 1. An electrically controlled valve 13 is installed on the outlet 12. A temperature sensor 14 is installed on the surface of the housing 1, with its measuring end extending into the housing 1. A control unit 15 is installed on the surface of the housing 1, and the heat exchange unit 2, the electrically controlled valve 13, and the temperature sensor 14 are all connected to the control unit 15.

[0048] Liquid is fed into the housing 1 through the inlet 11, exchanges heat with the heat exchange unit 2 located inside the housing 1, and then discharges from the outlet 12. A temperature sensor 14 installed on the housing 1 is used to monitor the liquid temperature in real time, and the opening of the electrically controlled valve 13 installed on the outlet 12 is adjustable, thereby adjusting the flow rate of the liquid discharged from the outlet 12. The user inputs preset temperature and flow rates into the terminal, and the control unit 15 uploads the liquid temperature data monitored in real time by the temperature sensor 14 and the liquid flow rate data discharged from the outlet 12 to the terminal. Based on the preset temperature and flow rates, the terminal changes the power of the heat exchange unit 2 and the opening of the electrically controlled valve 13 through the control unit 15.

[0049] (2) In this embodiment, the housing 1 is vertically positioned, and a support foot 10 is installed at the bottom. For example... Figure 3 As shown, the surface of the shell 1 has a refrigerant inlet 16 and a refrigerant outlet 17 pre-installed for connection with the heat exchange unit 2. The refrigerant is fed into the heat exchange unit 2 through the refrigerant inlet 16, and after exchanging heat with the liquid in the shell 1, the refrigerant is discharged from the refrigerant outlet 17. By controlling the amount of refrigerant, the heat exchange temperature inside the shell 1 can be controlled.

[0050] (3) In this embodiment, the bottom end of the shell 1 is tapered near the liquid inlet 11, and the bottom end of the shell 1 is connected to the shell body via a mating flange. The connection between the bottom end of the shell 1 and the shell body via the mating flange facilitates the disassembly of the shell-and-tube heat exchanger and the maintenance of the heat exchange unit 2 inside the shell 1.

[0051] (4) Figure 3 , Figure 5 As shown, in this embodiment, heat exchange unit 2 includes:

[0052] The spiral coil 21 is located inside the housing 1, and the refrigerant inlet 16 and refrigerant outlet 17 are both connected to the spiral coil 21.

[0053] The upper fixed plate 22 is installed inside the top of the housing 1, and the spiral coil 21 is connected to the upper fixed plate 22;

[0054] Vertical columns 23, four vertical columns 23 are circumferentially mounted on the upper fixed plate 22 with the spiral coil 21 as the center;

[0055] Upper filter box 24 is located at the end of spiral coil 21 away from upper fixed plate 22, and the opening of upper filter box 24 is set towards the liquid inlet 11.

[0056] Mounting base 25, four mounting bases 25 are circumferentially mounted on the side of the upper filter box 24, and the vertical column 23 is set with the mounting base 25 through the end away from the upper fixed plate 22;

[0057] A number of filter holes are distributed on the inner wall of the upper filter box 24;

[0058] The filter screen is placed inside the upper filter box 24.

[0059] The lower filter box 26 is located at the end of the upper filter box 24 away from the spiral coil 21. The opening of the lower filter box 26 is positioned close to the liquid inlet 11, and the bottom of the lower filter box 26 is positioned against the opening of the upper filter box 24.

[0060] Filter hole two, several filter holes two are distributed at the bottom of the lower filter box 26;

[0061] The conical inlet cylinder 27 is located at the end of the lower filter box 26 away from the upper filter box 24. The small diameter end of the conical inlet cylinder 27 extends into the opening of the lower filter box 26, and the large diameter end of the conical inlet cylinder 27 abuts against the bottom of the housing 1. The inlet port 11 is connected to the inside of the conical inlet cylinder 27.

[0062] Liquid is fed into the housing 1 through the inlet 11 located at the bottom of the housing 1. The liquid sequentially enters the conical inlet cylinder 27, the lower filter box 26, and the upper filter box 24. The conical inlet cylinder 27 guides the liquid into the lower filter box 26. After the lower filter box 26 completes the primary filtration of the liquid, the filter screen on the inner wall of the upper filter box 24 completes the secondary filtration of the liquid, thereby reducing the accumulation of impurities in the housing 1, preventing the accumulation of dirt on the spiral coil 21, and improving the service life of the spiral coil 21.

[0063] When the spiral coil 21 needs maintenance, after laying the housing 1 flat, remove the bottom end of the housing 1. Release the conical inlet cylinder 27 from its limiting position on the lower filter box 26. Take out and clean the lower filter box 26 and the upper filter box 24 in sequence. Lift the vertical column 23 with both hands and pull out the upper fixed plate 22 connected to the vertical column 23 and the spiral coil 21 installed on the upper fixed plate 22. Clean the surface of the spiral coil 21. After cleaning, hold the spiral coil 21 and insert the spiral coil 21 into the housing 1 near the upper fixed plate 22. Then, put in the upper filter box 24 (note the fit between the mounting base 25 and the vertical column 23) and the lower filter box 26 in sequence. Insert the small-diameter end of the conical inlet cylinder 27 into the lower filter box 26. After installing the bottom end of the housing 1, use the bottom end of the housing 1 to press against the large-diameter end of the conical inlet cylinder 27, thereby limiting the lower filter box 26 with the conical inlet cylinder 27. Then, straighten the housing 1.

[0064] (5) Figure 4 As shown in the embodiment, the heat exchange unit 2 further includes:

[0065] Card block storage slot 28, multiple card block storage slots 28 are circumferentially opened on the side end of the lower filter box 26 near the bottom end of the box;

[0066] Card block 29 is installed in card block storage slot 28;

[0067] A reset spring 20 is installed in the block receiving slot 28 and is connected between the bottom end of the block receiving slot 28 and the block 29.

[0068] The annular fastening groove 18 is installed at the opening end of the upper filter box 24, and the locking block 29, away from the end of the reset spring 20, is locked in the annular fastening groove 18.

[0069] The locking block 29 is retractably installed in the locking block storage slot 28 via the return spring 20. The locking block 29 and the annular fastening slot 18 enable a detachable connection between the opening end of the upper filter box 24 and the bottom end of the lower filter box 26.

[0070] (6) In the embodiment, a limiting top ring is installed on the vertical column 23, and the limiting top ring is adapted to the mounting base 25.

[0071] The setting of the limiting top ring facilitates the positioning of the mounting base 25 and the upper filter box 24 connected to the mounting base 25 on the vertical column 23.

[0072] (7) In this embodiment, the surface of the shell 1 is covered with a heat-insulating layer. The heat-insulating layer provides heat preservation for the liquid inside the shell 1.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A shell-and-tube heat exchanger with controllable flow rate and temperature, characterized in that, include: The housing (1) has an inlet (11) at the bottom and an outlet (12) at the top. Heat exchange unit (2), which is detachably installed inside the housing (1); An electrically controlled valve (13) is installed on the liquid outlet (12); Temperature sensor (14), the temperature sensor (14) is mounted on the surface of the housing (1), and the temperature measuring end of the temperature sensor (14) extends into the housing (1); Control unit (15), the control unit (15) is mounted on the surface of the housing (1), the heat exchange unit (2), the electrically controlled valve (13) and the temperature sensor (14) are all connected to the control unit (15); The heat exchange unit (2) includes: Spiral coil (21), the spiral coil (21) is located inside the housing (1), and the refrigerant inlet (16) and refrigerant outlet (17) are both connected to the spiral coil (21); Upper fixing plate (22), the upper fixing plate (22) is installed inside the top of the housing (1), and the spiral coil (21) is connected to the upper fixing plate (22); Vertical columns (23), four of the vertical columns (23) are circumferentially mounted on the upper fixed plate (22) with the spiral coil (21) as the center; The upper filter box (24) is located at the end of the spiral coil (21) away from the upper fixed plate (22), and the opening end of the upper filter box (24) is set towards the liquid inlet (11). Mounting base (25), four mounting bases (25) are circumferentially mounted on the side of the upper filter box (24), and the vertical column (23) is disposed with the mounting base (25) through the end away from the upper fixing plate (22); A plurality of filter holes are distributed on the inner wall of the upper filter box (24); A filter screen, which is placed inside the upper filter box (24); The lower filter box (26) is located at the end of the upper filter box (24) away from the spiral coil (21). The opening end of the lower filter box (26) is set towards the liquid inlet (11). The bottom end of the lower filter box (26) is set against the opening end of the upper filter box (24). Filter hole two, several of the filter holes two are distributed at the bottom end of the lower filter box (26); A conical liquid inlet cylinder (27) is located at the end of the lower filter box (26) away from the upper filter box (24). The small diameter end of the conical liquid inlet cylinder (27) extends into the opening of the lower filter box (26), and the large diameter end of the conical liquid inlet cylinder (27) abuts against the bottom of the housing (1). The liquid inlet (11) is connected to the inside of the conical liquid inlet cylinder (27). The heat exchange unit (2) further includes: Card block storage slot (28), a plurality of the card block storage slots (28) are circumferentially opened at the side end of the lower filter box (26) near the bottom end of the box; Card block (29), the card block (29) is installed in the card block storage slot (28); A reset spring (20) is installed in the card block storage slot (28) and the reset spring (20) is connected between the bottom end of the card block storage slot (28) and the card block (29). An annular snap-fit ​​groove (18) is installed at the opening end of the upper filter box (24), and the end of the locking block (29) away from the reset spring (20) is locked in the annular snap-fit ​​groove (18). A limiting top ring is installed on the vertical column (23), and the limiting top ring is adapted to the mounting base (25).

2. A shell-and-tube heat exchanger with controllable flow rate and temperature according to claim 1, characterized in that, The housing (1) is arranged vertically, and a support foot (10) is installed at the bottom of the housing (1).

3. A shell-and-tube heat exchanger with controllable flow rate and temperature according to claim 1, characterized in that, The surface of the shell (1) is provided with a refrigerant inlet (16) and a refrigerant outlet (17) for connection with the heat exchange unit (2).

4. A shell-and-tube heat exchanger with controllable flow rate and temperature according to claim 1, characterized in that, The bottom of the housing (1) is narrowed near the liquid inlet (11), and the bottom of the housing (1) is connected to the housing body through a mating flange.

5. A shell-and-tube heat exchanger with controllable flow rate and temperature according to claim 1, characterized in that, The surface of the shell (1) is covered with a heat insulation layer.

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