A type of quenching waste boiler with double tube sheets at both ends

Abstract

The utility model relates to the technical field of petrochemical equipment, and specifically to a quenching waste boiler with double tube sheets at both ends, including a main cylinder, an upper tube box, an upper thick tube sheet, an upper thin tube sheet, a lower thick tube sheet, a lower thin tube sheet and a lower tube box, forming a high-temperature process gas flow channel that passes through the tube side inlet ‑ lower tube box ‑ heat exchange tube ‑ upper tube box ‑ tube side outlet in sequence; and a cooling medium flow channel that passes through the cooling medium inlet ‑ shell side inlet chamber ‑ main shell side chamber ‑ shell side outlet chamber ‑ cooling medium outlet in sequence. Compared with the prior art, a thick and thin double tube sheet structure is provided at both the inlet and outlet ends, which is suitable for use scenarios with higher temperatures at the outlet end, and is particularly suitable for multi-connected heat exchange systems with multiple heat exchangers in series. Both the inlet and outlet ends separate the pressure and bearing force of the tube sheet, and the thin tube sheet bears the pressure load and plays a sealing role. The pressure load of the thin tube sheet is transmitted to the thick tube sheet through the tie bars between the thin tube sheet and the thick tube sheet, thereby realizing the separation of pressure and force.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, in particular to a quenching waste boiler with double tube plates at both ends. Background Art

[0002] In the fields of petroleum refining and chemical industry, coal chemical industry, etc., research on energy-saving and emission reduction technologies is increasing. Rapid cooling boilers are the most common and most widely used technical equipment in heat recovery work. The research and promotion of new-structure rapid cooling boilers will play an extremely important role in energy conservation.

[0003] The tube sheets on the inlet and outlet tube box sides of traditional quench boilers are both single and double tube sheet structures. When the quench boiler is in operation, the tube side medium is flue gas, with an inlet temperature of about 1200℃~800℃, an outlet temperature of about 400℃~300℃, and a pressure below 1Mpa, while the shell side medium is saturated steam, with a temperature of about 400℃ and a pressure of about 4Mpa~12Mpa. This results in a high temperature and pressure difference between the tube side and the shell side. The temperature difference will generate temperature difference stress on both sides of the tube sheet, and the pressure difference will generate bending stress on both sides of the tube sheet.

[0004] In view of the above-mentioned use conditions of the quench boiler, the traditional technology has several different structures of quench boilers. The first is a thick tube sheet quench boiler. The boiler tube sheet adopts a thick double tube sheet structure, which can well solve the bending stress problem caused by saturated steam on the tube sheet. However, the flue gas will produce a large temperature difference on both sides of the thick tube sheet, resulting in a large temperature difference stress, which reduces the cooling effect of the quench boiler. At the same time, the thick tube sheet has a small elastic deformation, so that the tube head of the heat exchange tube is in a rigid connection state with the tube sheet. When the tube head is subjected to stress and process operation fluctuations, it is easy to cause the tube head weld to crack. The second is a thin tube sheet quench boiler without a flexible structure. The tube sheet of this boiler is relatively thin, and the elastic deformation of the tube sheet can absorb part of the thermal expansion. At the same time, the thin tube sheet has a better thermal conductivity, and the temperature difference on both sides of the tube sheet is small, which reduces the temperature difference stress of the tube sheet during operation and enhances the cooling effect. However, the thin tube sheet quench boiler has limited pressure bearing capacity under high-pressure process media, and the deformation of the thin tube sheet is large, which affects the welding quality of the tube head. The third type is a thin tube sheet type quench boiler with a flexible structure. In addition to the thin tube sheet being able to reduce thermal stress and enhance cooling effect, the flexible structure of this type of quench boiler can effectively compensate for the temperature difference stress between the heat exchange tube and the shell, and protect the weld between the tube head and the tube sheet of the heat exchange tube from stress impact. Compared with a thin tube sheet type quench boiler without a flexible structure, the pressure bearing capacity of its tube sheet is enhanced. However, for large diameter tube sheets and high-pressure process media, its pressure bearing capacity is still limited.

[0005] Then, a vertical reinforced thin tube sheet heat recovery device as shown in the Chinese patent document with announcement number CN 204438882 U appeared. The lower tube sheet is connected to the porous plate through a support column to form a combined component, which can greatly reduce the thickness of the lower tube sheet. When the lower tube sheet is subjected to high temperature and high pressure medium, part of the pressure can be transmitted to the porous plate through the support column, reducing the partial pressure load of the lower tube sheet from the tube side or shell side, thereby greatly reducing the thickness of the lower tube sheet. The thinning of the lower tube sheet thickness can bring two benefits: first, it avoids the problems of difficulty in material selection, difficulty in processing, and decreased material performance caused by over-thick materials; second, the upper and lower plate surfaces of the tube sheet are heated more evenly, the thermal stress is small, and the temperature stress of the tube sheet is relieved. For the porous plate, since it only bears a certain pressure from the support column and is not subjected to the effect of high temperature, its thickness is also thin. Under high temperature and high pressure conditions, the lower tube sheet can also adopt a flexible thin tube sheet structure, thereby completely solving the various problems caused by the excessive thickness of the lower tube sheet. At the same time, the annular space formed by the design is conducive to improving the heat exchange efficiency.

[0006] However, conventional thinking is that the above double tube sheet structure is only required at the inlet end, and the temperature of the high-temperature medium at the outlet end is lower after heat exchange, so the outlet end can use ordinary thick tube sheets. However, the applicant found that for the multi-connected heat exchanger, the medium temperature at the outlet end of the front heat exchange module is still high. If the traditional single-layer tube sheet is used, the outlet end still has the problem of being difficult to balance pressure and force. Summary of the invention

[0007] In view of the above technical problems existing in the prior art, the utility model provides a rapid cooling waste boiler with double tube plates at both ends.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] Provided is a quenching waste boiler with double tube sheets at both ends, comprising a main cylinder, an upper tube box, an upper thick tube sheet, an upper thin tube sheet, a lower thick tube sheet, a lower thin tube sheet and a lower tube box;

[0010] The lower end of the main cylinder is connected to the lower inner cylinder with equal diameter, and the lower end of the lower inner cylinder is connected to the lower thick tube sheet; the upper end of the main cylinder is connected to the upper inner cylinder with equal diameter, and the upper end of the upper inner cylinder is connected to the circumference of the upper thick tube sheet, so that the upper thick tube sheet, the upper inner cylinder, the main cylinder, the lower inner cylinder, and the lower thick tube sheet together form a main shell chamber;

[0011] The lower thin tube sheet is arranged separately below the lower thick tube sheet, and a plurality of lower tie bars are arranged between the lower thick tube sheet and the lower thin tube sheet. The lower tube box is connected to the lower thin tube sheet and is provided with a tube pass inlet. The lower end of the main cylinder is provided with a lower outer cylinder, and the lower end of the lower outer cylinder is connected to the lower thin tube sheet. A distance is left between the periphery of the lower thick tube sheet and the inner wall of the lower outer cylinder, so that the lower outer cylinder, the lower inner cylinder, the lower thick tube sheet and the lower thin tube sheet jointly enclose a shell pass inlet chamber, and the lower outer cylinder is provided with a cooling medium inlet.

[0012] The upper thin tube sheet is arranged above the upper thick tube sheet, and a plurality of upper ribs are arranged between the upper thick tube sheet and the upper thin tube sheet. The upper tube box is connected to the upper thin tube sheet and is provided with a tube side outlet. The upper end of the main cylinder is provided with an upper outer cylinder, and the upper end of the upper outer cylinder is connected to the upper thin tube sheet. A distance is left between the periphery of the upper thick tube sheet and the inner wall of the upper outer cylinder, so that the upper outer cylinder, the upper inner cylinder, the upper thick tube sheet and the upper thin tube sheet jointly form a shell side outlet chamber, and the upper outer cylinder is provided with a cooling medium outlet.

[0013] A plurality of heat exchange tubes arranged in parallel are arranged in the main cylinder. The upper end of each heat exchange tube passes through the tube hole of the upper thick tube sheet, is welded to the upper thin tube sheet and is connected to the upper tube box. The lower end of each heat exchange tube passes through the tube hole of the lower thick tube sheet, is welded to the lower thin tube sheet and is connected to the lower tube box, thereby forming a high-temperature process gas flow passage that passes through the tube pass inlet-lower tube box-heat exchange tube-upper tube box-tube pass outlet in sequence.

[0014] There is a liquid gap between the outer wall of the heat exchange tube and the tube holes of the upper thick tube plate and the lower thick tube plate, thereby forming a cooling medium flow channel that passes through the cooling medium inlet-shell inlet chamber-main shell chamber-shell outlet chamber-cooling medium outlet in sequence.

[0015] As a further optional solution, the number of the cooling medium inlet is one or more than two, and the more than two cooling medium inlets are distributed around the circumference of the lower outer cylinder.

[0016] As a further optional solution, the axis of the cooling medium inlet is aligned with the axis of the lower inner cylinder, or the cooling medium inlet is arranged tangentially to the inner wall of the lower outer cylinder.

[0017] As a further optional solution, the number of the cooling medium outlets is one or more than two, and the more than two cooling medium outlets are distributed around the circumference of the upper outer cylinder.

[0018] As a further optional solution, the lower outer cylinder is provided with a sewage outlet in a normally closed state which is level with the top of the lower thin tube plate.

[0019] As a further optional solution, the lower thin tube plate and / or the upper thin tube plate is in the shape of a dish with a concave middle portion and a convex periphery.

[0020] As a further optional solution, the upper tie bars and the lower tie bars are column-shaped or plate-shaped.

[0021] As a further optional solution, the main cylinder, the lower inner cylinder and the upper inner cylinder are integrated with each other.

[0022] As a further optional solution, the main cylinder, the lower outer cylinder and the upper outer cylinder are integrated with each other.

[0023] As a further optional solution, the lower inner cylinder and the lower outer cylinder are integrated with each other, and the upper inner cylinder and the upper outer cylinder are integrated with each other.

[0024] Beneficial effects of the utility model:

[0025] Compared with the prior art, the utility model is a double-tube sheet rapid cooling waste boiler with two ends. The inlet and outlet ends are both provided with thick and thin double tube sheet structures, which are suitable for use scenarios with higher temperatures at the outlet end, and are particularly suitable for multi-connected heat exchange systems with multiple heat exchangers in series. The inlet and outlet ends separate the pressure and force of the tube sheet. The thin tube sheet bears the pressure load and plays a sealing role. The pressure load of the thin tube sheet is transmitted to the thick tube sheet through the tie bars between the thin tube sheet and the thick tube sheet, realizing the separation of pressure and force. In this way, the thick tube sheet only needs to bear the force and does not play a sealing role, that is, it does not belong to a pressure-bearing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a quenching waste boiler with double tube plates at both ends in an embodiment.

[0027] Figure 2 for Figure 1 Schematic diagram of shell side flow during operation.

[0028] Figure 3 It is a schematic structural diagram of a quenching waste boiler with double tube plates at both ends in another embodiment.

[0029] Reference numerals:

[0030] Main cylinder 1, upper tube box 2, upper thick tube sheet 3, upper thin tube sheet 4, lower thick tube sheet 5, lower thin tube sheet 6, lower tube box 7, lower inner cylinder 8, upper inner cylinder 9, main shell side chamber 10, lower tie rib 11, tube side inlet 12, lower outer cylinder 13, shell side inlet chamber 14, cooling medium inlet 15, upper tie rib 16, tube side outlet 17, upper outer cylinder 18, shell side outlet chamber 19, cooling medium outlet 20, heat exchange tube 21, liquid gap 22, sewage outlet 23. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] A quenching waste boiler with double tube plates at both ends of this embodiment, such as Figure 1 As shown, it includes a main cylinder 1, an upper tube box 2, an upper thick tube sheet 3, an upper thin tube sheet 4, a lower thick tube sheet 5, a lower thin tube sheet 6 and a lower tube box 7.

[0033] The lower end of the main cylinder 1 is connected with the lower inner cylinder 8 in equal diameter, and the lower end of the lower inner cylinder 8 is welded and fixed to the circumference of the lower thick tube sheet 5. The upper end of the main cylinder 1 is connected with the upper inner cylinder 9 in equal diameter, and the upper end of the upper inner cylinder 9 is welded and fixed to the circumference of the upper thick tube sheet 3, so that the lower end surface of the upper thick tube sheet 3, the inner wall of the upper inner cylinder 9, the inner wall of the main cylinder 1, the inner wall of the lower inner cylinder 8, and the upper end surface of the lower thick tube sheet 5 together form a main shell chamber 10.

[0034] The lower thin tube sheet 6 is arranged in parallel and separated below the lower thick tube sheet 5, and a plurality of lower tie bars 11 are arranged between the lower thick tube sheet 5 and the lower thin tube sheet 6 so as to fix the two as a whole. The lower tube box 7 is connected to the lower thin tube sheet 6 and is provided with a tube side inlet 12. The diameter of the lower thin tube sheet 6 is larger than the diameter of the lower thick tube sheet 5. The lower end of the main cylinder 1 is provided with a lower outer cylinder 13, which is located outside the lower inner cylinder 8. The lower end of the lower outer cylinder 13 is welded and fixed to the peripheral side of the lower thin tube sheet 6. There is a distance between the peripheral edge of the lower thick tube sheet 5 and the inner wall of the lower outer cylinder 13, so that the inner wall of the lower outer cylinder 13, the outer wall of the lower inner cylinder 8, the lower end surface of the lower thick tube sheet 5, and the upper end surface of the lower thin tube sheet 6 together form a shell side inlet chamber 14. The lower outer cylinder 13 is provided with a cooling medium inlet 15.

[0035] The upper thin tube sheet 4 is arranged in parallel and separated above the upper thick tube sheet 3, and a plurality of upper tie bars 16 are arranged between the upper thick tube sheet 3 and the upper thin tube sheet 4 so as to fix the two as a whole. The upper tube box 2 is connected to the upper thin tube sheet 4 and is provided with a tube side outlet 17. The diameter of the upper thin tube sheet 4 is larger than the diameter of the upper thick tube sheet 3. The upper end of the main cylinder 1 is provided with an upper outer cylinder 18, which is located outside the upper inner cylinder 9. The upper port of the upper outer cylinder 18 is welded and fixed to the peripheral side of the upper thin tube sheet 4. There is a distance between the peripheral edge of the upper thick tube sheet 3 and the inner wall of the upper outer cylinder 18, so that the inner wall of the upper outer cylinder 18, the outer wall of the upper inner cylinder 9, the upper end surface of the upper thick tube sheet 3, and the lower end surface of the upper thin tube sheet 4 together form a shell side outlet chamber 19, and the upper outer cylinder 18 is provided with a cooling medium outlet 20.

[0036] A plurality of heat exchange tubes 21 (only four are briefly shown in the figure) arranged in parallel are arranged in the main cylinder 1. The upper end of each heat exchange tube 21 passes through the tube hole of the upper thick tube sheet 3, and then is welded to the upper thin tube sheet 4 and connected to the upper tube box 2. The lower end of each heat exchange tube 21 passes through the tube hole of the lower thick tube sheet 5, and then is welded to the lower thin tube sheet 6 and connected to the lower tube box 7, thereby forming a high-temperature process gas flow channel that passes through the tube side inlet 12-lower tube box 7-heat exchange tube 21-upper tube box 2-tube side outlet 17 in sequence. When in use, the high-temperature process gas passes through this flow channel.

[0037] Liquid gaps 22 are left between the outer wall of the heat exchange tube 21 and the tube holes of the upper thick tube sheet 3 and the tube holes of the lower thick tube sheet 5, thereby forming a cooling medium flow channel that passes through the cooling medium inlet 15-shell side inlet chamber 14-main shell side chamber 10-shell side outlet chamber 19-cooling medium outlet 20 in sequence. When in use, the cooling medium flows in the flow channel. Figure 2 The solid arrow indicates the direction.

[0038] Compared with the prior art, both the inlet and outlet ends are provided with a thick-thin double tube sheet structure, which is suitable for the use scenario with a higher temperature at the outlet end, and is particularly suitable for a multi-connected heat exchange system with multiple heat exchangers in series. The pressure and bearing force of the tube sheet (a general term for the upper and lower thick and thin tube sheets) are separated at both the inlet and outlet ends. The thin tube sheet bears the pressure load and plays a sealing role. The pressure load of the thin tube sheet is transmitted to the thick tube sheet through the tie bars between the thin tube sheet and the thick tube sheet, realizing the separation of pressure and force. In this way, the thick tube sheet only needs to bear the force and does not play a sealing role, that is, it does not belong to a pressure-bearing part.

[0039] It should be noted that the so-called “thick” and “thin” in this embodiment are only relative relationships and are not limited to specific sizes. “Thin” has a certain flexibility.

[0040] In this embodiment, there are more than two cooling medium inlets 15, which are distributed around the circumference of the lower outer cylinder 13, resulting in a larger flow rate and more uniform distribution. Of course, in practice, only one cooling medium inlet 15 may be provided.

[0041] In practice, the axis of the cooling medium inlet 15 is aligned with the axis of the lower inner cylinder 8, or the cooling medium inlet 15 is arranged tangent to the inner wall of the lower outer cylinder 13, which can be horizontally tangent or inclined downwardly tangent.

[0042] Similarly, the number of the cooling medium outlets 20 is more than two, and the more than two cooling medium outlets 20 are distributed around the circumference of the upper outer cylinder 18. Of course, the number of the cooling medium outlet 20 can be changed to one.

[0043] Figure 1In the illustrated embodiment, the lower outer cylinder 13 is provided with a sewage outlet 23 in a normally closed state which is level with the top of the lower thin tube plate 6. The sewage outlet 23 is opened for cleaning after a certain period of operation.

[0044] Figure 3 In the embodiment shown, the difference lies in the lower thin tube sheet 6 and the upper thin tube sheet 4. The lower thin tube sheet 6 and the upper thin tube sheet 4 are in the shape of a dish with a concave middle and a convex periphery. The advantage is that the high-pressure water passing through forms a squeezing tendency toward the middle of the tube sheet to increase the flow rate, take away possible sediments, play a role in protecting the tube sheet and improving it, and prolong its service life.

[0045] In practice, the upper tie bars 16 and the lower tie bars 11 are in the shape of columns or plates, or a combination of these two shapes.

[0046] Each of the above-mentioned components may exist separately and be fixed to each other by welding / bolts, or two or more components may be prefabricated into an integral structure, for example: the main cylinder 1, the lower inner cylinder 8 and the upper inner cylinder 9 are mutually integrated structures; another example: the main cylinder 1, the lower outer cylinder 13 and the upper outer cylinder 18 are mutually integrated structures; another example: the lower inner cylinder 8 and the lower outer cylinder 13 are mutually integrated structures, and the upper inner cylinder 9 and the upper outer cylinder 18 are mutually integrated structures. The actual selection can be made according to the manufacturing conditions.

[0047] In the description of the present invention, it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the above detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0049] In the description of the present utility model, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A quenching waste boiler with double tube plates at both ends, characterized by: It comprises a main cylinder (1), an upper tube box (2), an upper thick tube sheet (3), an upper thin tube sheet (4), a lower thick tube sheet (5), a lower thin tube sheet (6) and a lower tube box (7); The lower end of the main cylinder (1) is connected to a lower inner cylinder (8) with equal diameter, and the lower end of the lower inner cylinder (8) is connected to a lower thick tube sheet (5); the upper end of the main cylinder (1) is connected to an upper inner cylinder (9) with equal diameter, and the upper end of the upper inner cylinder (9) is connected to the circumference of the upper thick tube sheet (3), so that the upper thick tube sheet (3), the upper inner cylinder (9), the main cylinder (1), the lower inner cylinder (8), and the lower thick tube sheet (5) together form a main shell chamber (10); The lower thin tube sheet (6) is arranged separately below the lower thick tube sheet (5), and a plurality of lower tie bars (11) are arranged between the lower thick tube sheet (5) and the lower thin tube sheet (6). The lower tube box (7) is connected to the lower thin tube sheet (6) and is provided with a tube side inlet (12). The lower end of the main cylinder (1) is provided with a lower outer cylinder (13), and the lower end of the lower outer cylinder (13) is connected to the lower thin tube sheet (6). A distance is left between the periphery of the lower thick tube sheet (5) and the inner wall of the lower outer cylinder (13), so that the lower outer cylinder (13), the lower inner cylinder (8), the lower thick tube sheet, and the lower thin tube sheet (6) together form a shell side inlet chamber (14). The lower outer cylinder (13) is provided with a cooling medium inlet (15); The upper thin tube sheet (4) is arranged separately above the upper thick tube sheet (3), and a plurality of upper tie bars (16) are arranged between the upper thick tube sheet (3) and the upper thin tube sheet (4); the upper tube box (2) is connected to the upper thin tube sheet (4) and is provided with a tube side outlet (17); an upper outer tube body (18) is arranged at the upper end of the main cylinder (1), and the upper end of the upper outer tube body (18) is connected to the upper thin tube sheet (4); a distance is left between the periphery of the upper thick tube sheet (3) and the inner wall of the upper outer tube body (18), so that the upper outer tube body (18), the upper inner tube body (9), the upper thick tube sheet (3), and the upper thin tube sheet (4) jointly enclose a shell side outlet chamber (19); and the upper outer tube body (18) is provided with a cooling medium outlet (20); A plurality of heat exchange tubes (21) arranged in parallel are arranged in the main cylinder (1); the upper end of each heat exchange tube (21) passes through the tube hole of the upper thick tube plate (3) and is welded to the upper thin tube plate (4) and is connected to the upper tube box (2); the lower end of each heat exchange tube (21) passes through the tube hole of the lower thick tube plate (5) and is welded to the lower thin tube plate (6) and is connected to the lower tube box (7), thereby forming a high-temperature process gas flow passage that passes through the tube side inlet (12) - the lower tube box (7) - the heat exchange tube (21) - the upper tube box (2) - the tube side outlet (17) in sequence; A liquid gap (22) is left between the outer wall of the heat exchange tube (21) and the tube holes of the upper thick tube sheet (3) and the lower thick tube sheet (5), thereby forming a cooling medium flow channel that passes through the cooling medium inlet (15) - shell side inlet chamber (14) - main shell side chamber (10) - shell side outlet chamber (19) - cooling medium outlet (20) in sequence.

2. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The number of the cooling medium inlet (15) is one or more than two, and the more than two cooling medium inlets (15) are distributed around the circumference of the lower outer cylinder (13).

3. The double-tube-sheet quenching waste boiler according to claim 2 is characterized in that: The axis of the cooling medium inlet (15) is aligned with the axis of the lower inner cylinder (8), or the cooling medium inlet (15) is arranged tangentially to the inner wall of the lower outer cylinder (13).

4. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The number of the cooling medium outlets (20) is one or more than two, and the more than two cooling medium outlets (20) are distributed around the circumference of the upper outer cylinder (18).

5. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The lower outer cylinder (13) is provided with a sewage outlet (23) in a normally closed state and level with the top of the lower thin tube plate (6).

6. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The lower thin tube plate (6) and / or the upper thin tube plate (4) are in the shape of a dish with a concave middle portion and a convex periphery.

7. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The upper tensioning bars (16) and the lower tensioning bars (11) are column-shaped or plate-shaped.

8. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The main cylinder (1), the lower inner cylinder (8) and the upper inner cylinder (9) are integrated with each other.

9. The double-tube-sheet quenching waste boiler according to claim 1 is characterized in that: The main cylinder (1), the lower outer cylinder (13) and the upper outer cylinder (18) are integrated with each other.

10. The double-tube-sheet quenching waste boiler according to claim 1 is characterized by: The lower inner cylinder (8) and the lower outer cylinder (13) are integrated with each other, and the upper inner cylinder (9) and the upper outer cylinder (18) are integrated with each other.

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