Flue gas steam heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and provides a flue gas steam heat exchanger which comprises a shell pass barrel, an upper tube box barrel, a steam-water mixture outlet and an expansion joint, and a heat exchange tube is arranged in the shell pass barrel in a penetrating mode. The upper tube box barrel is arranged at the top of the shell pass barrel, and a gas inlet is formed in the side face of the upper tube box barrel; the steam-water mixture outlet is arranged in the upper tube box barrel in a penetrating manner and is communicated with the shell pass barrel; the expansion joint is arranged on the steam-water mixture outlet and located outside the upper tube box barrel. The expansion difference between the tube side and the shell side can be absorbed through the expansion joint, the equipment reliability is improved, meanwhile, the expansion joint is arranged outside the upper tube box barrel, follow-up influences on castable construction can be avoided, and later maintenance of the expansion joint is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a flue gas steam heat exchanger. Background Technology

[0002] In industrial production processes, numerous pieces of equipment, such as boilers, heating furnaces, and kilns, generate large amounts of high-temperature flue gas. This flue gas contains considerable heat, and directly releasing it into the atmosphere would undoubtedly be a huge waste of energy. Flue gas heat exchangers capitalize on this usable energy source by recovering waste heat from the flue gas through heat exchange technology.

[0003] In many situations, flue gas heat exchangers can help other equipment reduce its own energy consumption. Take industrial boilers as an example: without a flue gas heat exchanger, to ensure the boiler's thermal efficiency and sufficient heat output, a large amount of fuel is often consumed, and the air required for combustion must be continuously heated to maintain good combustion. However, when a flue gas heat exchanger is installed, the waste heat of the flue gas is recovered, preheating the air entering the boiler. The increased air temperature allows for faster and more complete combustion of the fuel in the furnace. As a result, the boiler does not need to consume as much fuel as before to maintain the same heat output. Under the same heating or production requirements, the boiler's energy consumption is significantly reduced, and the energy utilization of the entire system is more economical and rational, achieving the goal of energy conservation. It also reduces environmental problems such as pollutant emissions caused by large-scale fuel combustion.

[0004] Currently, some heat exchangers solve the problem of differential expansion caused by the temperature difference between the heat exchange tubes and the shell by installing expansion joints in the shell-side cavity. However, this structure has shortcomings in the production process when applied to large flue gas steam heat exchangers. Since the inner cavity requires secondary construction for refractory casting, and internal operating space is needed, placing the expansion joint inside would affect the secondary construction. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a flue gas steam heat exchanger that solves the problem that current heat exchangers use expansion joints located in the shell-side cavity to address the expansion difference caused by the temperature difference between the heat exchange tubes and the shell, which affects the construction of secondary refractory materials in the internal space.

[0006] This utility model provides a flue gas steam heat exchanger, comprising:

[0007] A shell-side cylindrical body, wherein heat exchange tubes are inserted through the shell-side cylindrical body;

[0008] The upper tube box is disposed at the top of the shell-side tube, and a gas inlet is provided on the side of the upper tube box;

[0009] The outlet for the carbonated water mixture passes through the upper tube box and communicates with the shell-side tube.

[0010] An expansion joint is provided at the outlet of the soda-water mixture, and the expansion joint is located outside the upper pipe box cylinder.

[0011] As can be seen from the above technical solution, the flue gas steam heat exchanger provided by this utility model has different expansion amounts between the shell side and the heat exchange tube due to the difference in tube and shell side materials and temperatures. The expansion difference between the shell and the tube side is transmitted through the heat exchange tube, upper tube sheet, and upper tube box body, and is finally absorbed by the expansion joint, which reduces the internal stress of each component of the shell and tube side and ensures the safe and reliable operation of the overall equipment. At the same time, the expansion joint is set on the outside of the upper tube box body, which can avoid affecting the subsequent casting of refractory material and is also conducive to later maintenance.

[0012] Optionally, the shell-side cylinder is further provided with an upper shell-side cylinder and a lower shell-side cylinder, both of which are connected to the shell-side cylinder; the lower shell-side cylinder is provided with a water inlet, a steam outlet, and a steam inlet.

[0013] Optionally, an upper tube sheet and a lower tube sheet are respectively provided at the top of the upper shell-side cylinder and the bottom of the lower shell-side cylinder, and both the upper tube sheet and the lower tube sheet are flexible tube sheets.

[0014] As can be seen from the above technical solutions, by setting up flexible tube sheets, the stress on the upper and lower tube sheets can be reduced, and the stress-bearing effect can be improved.

[0015] Optionally, the outlet of the soda mixture includes an inner tube and a semi-circular outer tube, the semi-circular outer tube being disposed outside the inner tube, and a mullite felt being disposed between the inner tube and the semi-circular outer tube.

[0016] Optionally, the inner wall of the upper pipe box is provided with mullite silica felt, and a liner is also provided to fix the mullite silica felt. By providing mullite silica felt, the heat insulation performance of the incoming gas is improved and heat loss is reduced.

[0017] Optionally, a lower end cap is also provided below the lower tube sheet, and a gas outlet is provided at the bottom of the lower end cap.

[0018] Optionally, it also includes a grounding plate and a skirt base, the skirt base being connected to the grounding plate, the lower end cap being connected to the skirt base, and the skirt base being provided with a plurality of vents.

[0019] Optionally, the upper tube box body, the lower shell body, and the skirt are all provided with inspection ports.

[0020] Optionally, a conical guard plate is provided outside the expansion joint.

[0021] By adopting the above technical solution, this application has the following technical effects:

[0022] Due to differences in shell and tube materials and temperatures, the expansion amounts of the shell and heat exchange tubes differ. In the flue gas steam heat exchanger provided by this invention, the expansion difference between the shell and tube sides is transmitted through the heat exchange tubes, upper tube sheet, and upper tube box, and is finally absorbed by the expansion joint. This reduces the internal stress of each component in the shell and tube sides, ensuring the safe and reliable operation of the overall equipment. At the same time, the expansion joint is located outside the upper tube box, which avoids affecting subsequent refractory casting construction and facilitates later maintenance of the expansion joint. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a flue gas steam heat exchanger provided in an embodiment of this utility model;

[0025] Figure 2 A schematic diagram of the outlet for the soda-water mixture provided in an embodiment of this utility model;

[0026] Figure 3 for Figure 1 A top view of a flue gas steam heat exchanger is shown.

[0027] Figure 4 for Figure 1 A cross-sectional view along the AA direction.

[0028] Figure label:

[0029] 1-Shell side shell; 2-Upper tube sheet; 3-Expansion joint; 4-Heat exchange tube; 5-Upper shell side shell; 6-Lower shell side shell; 7-Upper tube sheet; 8-Lower tube sheet; 9-Inner tube; 10-Semi-circular outer tube; 11-Liner; 12-Lower end cap; 13-Ground plate; 14-Skirt; 15-Inspection port; 16-Conical guard plate; 17-Baffle plate; 18-Spacing tube; 19-Tie rod; 20-Flange cover; 21-Sealing plate; 22-Connecting pipe; 23-Flat plate; 24-Support plate; 25-Lifting lug; 26-Guardrail support;

[0030] N1 - Gas-water mixture outlet; N2 - Gas inlet; N3 - Water inlet; N4 - Steam outlet; N5 - Steam inlet; N6 - Gas outlet; N7 - Exhaust port; N8 - Instrument port. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0033] In the description of this application, it should be understood that the terms "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] like Figure 1-4 As shown, this embodiment provides a flue gas steam heat exchanger, including:

[0036] Shell-side cylindrical body 1, with heat exchange tubes 4 passing through it;

[0037] The upper tube box 2 is located at the top of the shell-side tube box 1, and a gas inlet N2 is provided on the side of the upper tube box 2.

[0038] The outlet N1 of the soda-water mixture is installed in the upper tube box 2 and is connected to the shell side tube 1;

[0039] Expansion joint 3 is installed on the outlet N1 of the steam-water mixture, and expansion joint 3 is located outside the upper pipe box cylinder 2.

[0040] Due to differences in shell and tube materials and temperatures, the expansion amounts of the shell-side cylinder 1 and heat exchange tubes 4 differ. This expansion difference is transmitted through the heat exchange tubes 4, upper tube sheet 7, and upper tube box cylinder 2, and is finally absorbed by the expansion joint 3. This reduces the internal stress of the shell and tube components, ensuring the safe and reliable operation of the overall equipment. Simultaneously, the expansion joint 3, located outside the upper tube box cylinder 2, also avoids affecting subsequent refractory casting. The specific arrangement of the heat exchange tubes is as follows... Figure 4 As shown.

[0041] Optionally, an upper tube sheet 7 and a lower tube sheet 8 are respectively provided at the top of the upper shell-side cylinder 5 and the bottom of the lower shell-side cylinder 6. Both the upper tube sheet 7 and the lower tube sheet 8 are flexible tube sheets. By providing flexible tube sheets, the stress on the upper tube sheet 7 and the lower tube sheet 8 can be reduced, ensuring the stress distribution effect.

[0042] See Figure 1 The shell-side cylindrical body 1 is also equipped with several baffles 17, which are staggered to form a bent gas flow channel. The heat exchange tubes 4 pass through the baffles 17. Specifically, the positioning of the baffles 17 is achieved by spacer tubes 18 and tie rods 19; specifically, it includes two spacer tubes 18 and one tie rod 19. The two spacer tubes 18 are sleeved on the tie rod 19, with the bottom of the lower spacer tube 18 fixed to the lower tube sheet 8, and the top of the tie rod 19 is fixed with a nut. The shell-side cylindrical body 1 is also equipped with an upper shell-side cylindrical body 5 and a lower shell-side cylindrical body 6, both of which are connected to the shell-side cylindrical body 1; the lower shell-side cylindrical body is equipped with a water inlet N3, a steam outlet N4, and a steam inlet N5.

[0043] See Figure 1 Both the shell-side cylindrical body 1 and the upper tube box cylindrical body 2 are equipped with guardrail supports, which can be used in conjunction with the installation of guardrails. The upper tube box cylindrical body 2 is also equipped with lifting lugs 25 for easy hoisting.

[0044] See Figure 2 The outlet N1 for the soda mixture includes an inner tube 9 and a semi-circular outer tube 10. The two semi-circular outer tubes 10 are arranged outside the inner tube 9, and a mullite felt is also arranged between the inner tube 9 and the semi-circular outer tubes 10.

[0045] The inner wall of the upper pipe box cylinder 2 is lined with mullite silica felt, and a liner plate 11 is also provided to fix the mullite silica felt. Specifically, the liner plate 11 is fixed by a sealing plate 21. By using mullite silica felt, the insulation performance for the incoming gas is improved, and heat loss is reduced.

[0046] Optionally, a lower end cap 12 is also provided below the lower tube sheet 8, and a gas outlet N6 is provided at the bottom of the lower end cap 12. Specifically, a support plate 24 is fixed on the lower end cap 12 to ensure the connection strength between the bottom of the lower end cap 12 and the skirt 14.

[0047] Optionally, it also includes a grounding plate 13 and a skirt 14, with the skirt 14 connected to the grounding plate 13, the lower end cap 12 connected to the skirt 14, and a plurality of vents N7 evenly spaced on the skirt 14. Figure 1 As shown, a flange cover 20 is also provided on the top of the upper pipe box body 2, and an exhaust port N7 and an instrument port N8 are also provided on the flange cover 20.

[0048] like Figure 1As shown, the upper tube box 2, the lower shell-side tube box 6, and the skirt are all equipped with inspection ports 15. This facilitates the inspection of the upper tube box 2, the lower shell-side tube box 6, and the skirt 14.

[0049] Optionally, a conical guard plate 16 is provided outside the expansion joint 3. For example... Figure 2 As shown, the top of the expansion joint 3 is provided with a connecting pipe 22, and a flat plate 23 is threaded onto the connecting pipe 22. The conical guard plate 16 is connected to the flat plate 23, and the conical guard plate 16 provides a certain degree of protection for the expansion joint 3.

[0050] See Figure 1 The flue gas steam heat exchanger is also equipped with multiple instrument ports N8, which are used to monitor key parameters such as temperature, pressure and flow rate to ensure the normal operation of the heat exchanger.

[0051] Based on the flue gas steam heat exchanger provided in this embodiment, the expansion joint can absorb the expansion difference between the tube and shell sides, reduce the internal stress of each component in the tube and shell sides, and ensure the safe and reliable operation of the overall equipment; at the same time, the expansion joint 3 is set outside the upper tube box cylinder 2, which can also avoid affecting the subsequent casting construction and is beneficial to later maintenance.

[0052] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A flue gas steam heat exchanger, characterized in that, It comprises: A shell side cylinder, in which heat exchange tubes are arranged; An upper tube sheet cylinder arranged at the top of the shell side cylinder, the side of which is provided with a gas inlet; A steam-water mixture outlet arranged in the upper tube sheet cylinder and communicating with the shell side cylinder; An expansion joint arranged on the steam-water mixture outlet, which is located outside the upper tube sheet cylinder.

2. The flue gas steam heat exchanger of claim 1, wherein, The shell side cylinder is further provided with a shell side upper cylinder and a shell side lower cylinder, both of which are arranged in communication with the shell side cylinder; the shell side lower cylinder is provided with a water inlet, a steam outlet and a steam inlet.

3. The flue gas steam heat exchanger of claim 2, wherein, The top of the shell side upper cylinder and the bottom of the shell side lower cylinder are respectively provided with an upper tube sheet and a lower tube sheet, both of which are flexible tube sheets.

4. The flue gas steam heat exchanger of claim 3, wherein, The steam-water mixture outlet comprises an inner tube and a semicircular outer tube, the semicircular outer tube is arranged outside the inner tube, and mullite silicon felt is further arranged between the inner tube and the semicircular outer tube.

5. The flue gas steam heat exchanger of claim 4, wherein, The inner wall of the upper tube sheet cylinder is provided with mullite silicon felt, and a lining plate is further arranged to fix the mullite silicon felt.

6. The flue gas steam heat exchanger of claim 3, wherein, The lower tube sheet is further provided with a lower head, the bottom of which is provided with a gas outlet.

7. The flue gas steam heat exchanger of claim 6, wherein, It further comprises a grounding plate and a skirt, the skirt is connected with the grounding plate, the lower head is connected with the skirt, and a plurality of exhaust ports are arranged on the skirt.

8. The flue gas steam heat exchanger of claim 7, wherein, The upper tube sheet cylinder, the shell side lower cylinder and the skirt are all provided with inspection ports.

9. The flue gas steam heat exchanger of claim 1, wherein, A cone guard plate is arranged outside the expansion joint.

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