Passive cooling sandwich structure for waste heat boiler flexible tube plate and boiler system based thereon

Abstract

The present application relates to the technical field of flexible tube sheet cooling of waste boiler, in particular to a passive cooling interlayer structure of flexible tube sheet of waste boiler and a boiler system based on the same, in order to solve the cooling problem of the upper flexible tube sheet of vertical fire tube waste boiler, the interlayer structure is located at the upper part of the heat exchange tube bundle in the waste boiler, the interlayer structure comprises a flexible tube sheet, a circulating water inlet assembly, a circulating water outlet assembly and a sealing partition plate; the flexible tube sheet is connected with the top of the heat exchange tube bundle in the waste boiler to fix the heat exchange tube bundle, the flexible tube sheet and the sealing partition plate are sequentially fixed in the waste boiler from top to bottom, the interlayer is formed between the flexible tube sheet and the sealing partition plate, the circulating water inlet assembly and the circulating water outlet assembly are connected with the waste boiler, and the circulating water inlet assembly and the circulating water outlet assembly are both communicated with the interlayer, the circulating water inlet assembly is arranged at the low point of the interlayer, and the circulating water outlet assembly is arranged at the high point of the interlayer, and the present application realizes the separate cooling of the flexible tube sheet efficiently, stably and energy-savingly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible tube plate cooling of waste boiler, in particular to a passive cooling sandwich structure of flexible tube plate of waste boiler and a boiler system based on the same. BACKGROUND

[0002] In the petrochemical industry, especially in the coal chemical industry, there are many waste heat recovery boilers. When the medium for waste heat recovery has a high ash content and a high temperature, a vertical fire tube with a flexible tube plate structure is generally used. The ash content is large, and all structures involving horizontal flow will be blocked due to ash accumulation, such as horizontal structures and vertical U-shaped structures. The temperature is high, and the fire tube structure with a thick tube plate will fail due to the inability to cool the tube plate, resulting in overheating. Therefore, there are only two types of vertical fire tube flexible tube plate waste boiler and vertical serpentine tube water tube waste boiler. Due to the complex structure of the serpentine tube waste boiler and the difficulty in manufacturing, a rapping device is generally required for ash removal. Therefore, the mainstream solution is a natural convection vertical fire tube flexible tube plate waste boiler.

[0003] The vertical fire tube flexible tube plate waste boiler refers to a waste heat medium flowing in the tube of a heat exchanger (i.e., a fire tube), and the overall structure is vertical. The heat exchange tube is a column type (i.e., a straight tube), and the tube plate is a flexible tube plate. For ash-containing media, the medium flows from top to bottom in the tube, so there is no problem of ash accumulation. The inlet of the shell side medium is saturated water, and the outlet is saturated steam. The steam flows from bottom to top, absorbs heat from the tube side medium, evaporates, and cools the heat exchange tube to ensure that the average wall temperature of the heat exchange tube and the shell are consistent, avoiding excessive temperature difference leading to expansion and damage. Natural convection is used, which means that the steam-water circulation on the shell side is a natural convection cycle. The circulating water will automatically circulate under the action of density difference and height difference, without the need for additional driving force.

[0004] However, the tube plate is densely covered with heat exchange tubes, and the high-temperature medium in the tube will continuously transfer heat to the tube plate. If the heat from the tube plate cannot be removed in time, the tube plate will fail due to overheating. Therefore, the tube plate must be thin, i.e., a flexible tube plate. For the flexible tube plate at the lower part of the waste boiler, it can be fully in contact with the circulating water, so the heat can be removed by the circulating water to ensure that the temperature is within the allowable range. However, for the upper tube plate, the circulating water has completed the entire heat exchange process, and the volume fraction of steam in the circulating water will be high (about 50%). Under the action of gravity, the steam will tend to be in the upper layer of the steam flow, resulting in that the upper tube plate is mainly in contact with steam, which has poor heat exchange capacity, and cannot remove the heat from the tube plate, easily leading to overheating and failure of the tube plate. SUMMARY

[0005] The purpose of the present application is to solve the cooling problem of the upper flexible tube plate of the vertical fire tube waste boiler, ensure the stability of its operation, and maintain the temperature of the upper flexible tube plate within the allowable range. The present application provides a passive cooling sandwich structure for the flexible tube plate of a waste boiler and a boiler system based thereon.

[0006] The purpose of the present application is achieved by a passive cooling sandwich structure for the flexible tube plate of a waste boiler, characterized in that the sandwich structure is arranged in a vertical waste boiler, located at the upper part of the heat exchange tube bundle in the waste boiler, and comprises a flexible tube plate, a circulating water inlet assembly, a circulating water outlet assembly, and a sealing partition plate.

[0007] The flexible tube plate is connected to the top of the heat exchange tube bundle in the waste boiler to fix the heat exchange tube bundle. The flexible tube plate and the sealing partition plate are sequentially fixed in the waste boiler from top to bottom, forming a sandwich structure between them. The circulating water inlet assembly and the circulating water outlet assembly are connected to the waste boiler, and both are in communication with the sandwich structure. The circulating water inlet assembly is arranged at the low point of the sandwich structure, and the circulating water outlet assembly is arranged at the high point of the sandwich structure.

[0008] Further, an annular groove is provided upwardly between the flexible tube plate and the inner wall of the waste boiler.

[0009] Further, the sandwich structure further comprises at least one pair of baffles.

[0010] Each pair of baffles is symmetrically arranged in the sandwich structure and fixed to the inner wall of the waste boiler.

[0011] Further, the sealing partition plate comprises a partition plate, a plurality of ring plates, and a plurality of bolts.

[0012] The plurality of ring plates are fixed to the inner wall of the waste boiler, and the partition plate is arranged above the plurality of ring plates, and the partition plate is fixed to each ring plate by a bolt.

[0013] Further, the plurality of ring plates are uniformly distributed in the circumferential direction.

[0014] Further, the circulating water inlet assembly comprises an inlet connector and a distribution pipe.

[0015] The distribution pipe is an arc-shaped elbow pipe, arranged in the sandwich structure, and has a plurality of water outlet holes uniformly distributed thereon. The inlet connector is in communication with the distribution pipe after passing through the side wall of the waste boiler.

[0016] Further, the inlet connector is in communication with the middle part of the distribution pipe.

[0017] Further, the circulating water outlet assembly comprises an outlet connector, a collecting main pipe, and a plurality of branch pipes.

[0018] The inlet ends of the plurality of branch pipes are communicated with the interlayer, the outlet ends of the plurality of branch pipes are communicated with a collecting main pipe arranged outside the waste heat boiler, and the inlet end of the outlet connecting pipe is communicated with the outlet end of the collecting main pipe.

[0019] Further, the boiler system based on the passive cooling interlayer structure of the waste heat boiler flexible tube plate comprises a waste heat boiler, a steam drum, a downcomer, an upcomer and an interlayer structure;

[0020] The waste heat boiler is vertically and obliquely arranged, the axis of the waste heat boiler forms an angle a with the vertical direction, and the steam drum is arranged above the waste heat boiler;

[0021] The outlet end of the steam drum is connected with the inlet end of the downcomer, the outlet end of the downcomer is connected with a downcomer main path and a downcomer branch path, and the downcomer branch path is communicated with the inlet connecting pipe;

[0022] The inlet end of the steam drum is connected with the outlet end of the upcomer, the inlet end of the upcomer is connected with an upcomer main path and an upcomer branch path, and the upcomer branch path is communicated with the outlet connecting pipe;

[0023] The downcomer main path and the upcomer main path are both communicated with the side wall of the waste heat boiler between the two flexible tube plates connected on both sides of the heat exchange tube bundle in the waste heat boiler, the downcomer main path is located above the lower flexible tube plate, and the upcomer main path is located below the sealing partition plate.

[0024] Beneficial effects:

[0025] The scheme solves the cooling problem of the natural circulation vertical fire tube waste heat boiler flexible tube plate, the cooling interlayer not only has a reliable sealing structure, an oblique arrangement beneficial to natural flow of steam, an inlet and outlet structure with uniform distribution, a baffle for improving the utilization rate of circulating water, but also adopts a passive form in system arrangement, so that the interlayer water circulation has the maximum natural circulation driving force, thereby realizing efficient, stable and energy-saving independent cooling of the flexible tube plate, and ensuring safe and reliable and energy-saving operation of the vertical fire tube waste heat boiler. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the passive cooling interlayer structure of the waste heat boiler flexible tube plate and the boiler system based thereon of the application;

[0027] Figure 2 is an A-A view of Figure 1 ;

[0028] Figure 3 is an enlarged view of I of Figure 1 ; DETAILED DESCRIPTION

[0029] Specific embodiment one: flexible tube sheet passive cooling sandwich structure of waste heat boiler, the sandwich structure is arranged in the vertical waste heat boiler 1, the sandwich structure is located in the upper part of the heat exchange tube bundle in the waste heat boiler 1, and the sandwich structure comprises a flexible tube sheet 1-1, a circulating water inlet assembly 1-2, a circulating water outlet assembly 1-3 and a sealing partition plate 1-4;

[0030] The flexible tube sheet 1-1 is connected with the top of the heat exchange tube bundle in the waste heat boiler 1 to fix the heat exchange tube bundle, the flexible tube sheet 1-1 and the sealing partition plate 1-4 are sequentially fixed in the waste heat boiler 1 from top to bottom, a sandwich layer is formed between the flexible tube sheet 1-1 and the sealing partition plate 1-4, the circulating water inlet assembly 1-2 and the circulating water outlet assembly 1-3 are connected with the waste heat boiler 1, and the circulating water inlet assembly 1-2 and the circulating water outlet assembly 1-3 are both communicated with the sandwich layer, the circulating water inlet assembly 1-2 is arranged at the low point of the sandwich layer, and the circulating water outlet assembly 1-3 is arranged at the high point of the sandwich layer.

[0031] Specific embodiment two: flexible tube sheet passive cooling sandwich structure of waste heat boiler, an annular groove upwardly arranged is arranged between the flexible tube sheet 1-1 and the inner wall of the waste heat boiler 1.

[0032] In the embodiment, the flexible tube sheet is arranged protruding downwardly, and an upward groove is formed around the inner wall of the waste heat boiler. The steam generated in the sandwich layer flows out of the tube bundle and then collects in the groove, and then flows into the circulating water inlet assembly 1-2 along the groove, so that the flow channel is more smooth, the risk of steam accumulation on the lower surface of the tube sheet is reduced, and the cooling effect is improved.

[0033] Other embodiments are the same as specific embodiment one.

[0034] Specific embodiment three: flexible tube sheet passive cooling sandwich structure of waste heat boiler, the sandwich structure further comprises at least one pair of baffles 1-5.

[0035] Each pair of baffles 1-5 is symmetrically arranged in the sandwich layer and fixed on the inner wall of the waste heat boiler 1.

[0036] In the embodiment, the circulating water inlet assembly is composed of an inlet connecting pipe and a distribution pipe. The distribution pipe is arranged in the gap between the tube bundle and the shell, and is symmetrically arranged at a certain angle to the two sides. Holes are arranged on the distribution pipe at certain intervals towards the center of the tube bundle. The circulating water flowing from the inlet connecting pipe is uniformly distributed in the sandwich layer through the distribution pipe, the uniformity of the flow field is improved, the risk of flow dead zone (also a cooling dead zone) is reduced, and the cooling effect is ensured. The circulating water inlet assembly needs to be arranged at the lowest point of the sandwich layer to match the flow direction of the steam.

[0037] Other embodiments are the same as specific embodiment one.

[0038] Specific embodiment four: flexible tube sheet passive cooling sandwich structure of waste heat boiler, the sealing partition plate 1-4 includes a partition plate 1-4-1, a plurality of ring plates 1-4-2 and a plurality of bolts 1-4-3;

[0039] The plurality of ring plates 1-4-2 are fixed on the inner wall of the waste heat boiler 1, the partition plate 1-4-1 is arranged above the plurality of ring plates 1-4-2, and the partition plate 1-4-1 is fixed with each ring plate 1-4-2 by a bolt 1-4-3.

[0040] In this embodiment: the ring plate is first ring-welded on the cylinder wall, the bolt is welded, the partition plate is buckled, and finally the nut is tightened. The partition plate is a whole circular plate, and the bolt groups are uniformly arranged in the overlapping area of the partition plate and the ring plate. By tightening the nut, the partition plate and the ring plate are tightly attached, that is, a separate sandwich structure is isolated at the top of the waste heat boiler shell.

[0041] Other embodiments are the same as specific embodiment one.

[0042] Specific embodiment five: flexible tube sheet passive cooling sandwich structure of waste heat boiler, a plurality of ring plates 1-4-2 are arranged along the circumferential direction.

[0043] Other embodiments are the same as specific embodiment one.

[0044] Specific embodiment six: flexible tube sheet passive cooling sandwich structure of waste heat boiler, the circulating water inlet assembly 1-2 includes an inlet connector 1-2-1 and a distribution pipe 1-2-2;

[0045] The distribution pipe 1-2-2 is an arc-shaped elbow pipe, the distribution pipe 1-2-2 is arranged in the sandwich, and a plurality of water outlet holes are uniformly arranged on the distribution pipe 1-2-2; the inlet connector 1-2-1 communicates with the distribution pipe 1-2-2 after penetrating through the side wall of the waste heat boiler 1.

[0046] In this embodiment: the circulating water inlet assembly is composed of an inlet connector and a distribution pipe. The distribution pipe is arranged in the gap between the tube bundle and the shell, and is symmetrically arranged at a certain angle to the two sides. Holes are opened on the distribution pipe every certain distance towards the center of the tube bundle. The circulating water flowing from the inlet connector will be evenly distributed in the sandwich through the distribution pipe, improving the uniformity of the flow field and reducing the risk of flow dead zones (also known as cooling dead zones), thereby ensuring the cooling effect. The circulating water inlet assembly needs to be arranged at the lowest point of the sandwich to match the flow direction of the steam body.

[0047] Other embodiments are the same as specific embodiment four.

[0048] Specific embodiment seven: flexible tube sheet passive cooling sandwich structure of waste heat boiler, the inlet connector 1-2-1 communicates with the middle part of the distribution pipe 1-2-2.

[0049] In this embodiment: other embodiments are the same as specific embodiment one.

[0050] Specific implementation eight: waste pot flexible tube plate passive cooling sandwich structure, the circulating water outlet assembly 1-3 includes an outlet pipe 1-3-1, a manifold 1-3-2 and a plurality of branch pipes 1-3-3;

[0051] The inlet end of the plurality of branch pipes 1-3-3 is in communication with the sandwich, the outlet end of the plurality of branch pipes 1-3-3 is in communication with the manifold 1-3-2 arranged outside the waste pot 1, and the inlet end of the outlet pipe 1-3-1 is in communication with the outlet end of the manifold 1-3-2.

[0052] In this embodiment: the circulating water outlet assembly is composed of an outlet pipe, a manifold and branch pipes. The circulating water outlet assembly needs to be arranged at the highest point of the sandwich, matching the flow direction of the steam body. The branch pipes are arranged in multiple and symmetrically arranged along both sides of the highest point of the sandwich. The circulating water (saturated steam-water state) led out from the branch pipes is collected into the manifold and then flows out from the outlet pipe. Multiple branch pipes are arranged at the outlet, which can improve the uniformity of the circulating water flowing out and avoid the accumulation of a large amount of steam body at one place, thereby ensuring the cooling effect. The steam body flowing out from the pipe bundle will be collected at the groove of the flexible tube plate. In order to improve the efficiency of discharging the steam body, the center line of the branch pipe needs to be higher than the lower surface of the flexible tube plate, further improving the cooling effect.

[0053] Other embodiments are the same as specific implementation six.

[0054] Specific implementation nine: a boiler system based on the waste pot flexible tube plate passive cooling sandwich structure, which comprises a waste pot 1, a steam drum 2, a downcomer 3, an upcomer 4 and a sandwich structure;

[0055] The waste pot 1 is arranged vertically and obliquely, the axis of the waste pot 1 forms an angle α with the vertical direction, and the steam drum 2 is arranged above the waste pot 1;

[0056] The outlet end of the steam drum 2 is connected to the inlet end of the downcomer 3, the outlet end of the downcomer 3 is connected to a downcomer main path 3-1 and a downcomer branch path 3-2, and the downcomer branch path 3-2 is in communication with the inlet pipe 1-2-1;

[0057] The inlet end of the steam drum 2 is connected to the outlet end of the upcomer 4, and the inlet end of the upcomer 4 is connected to an upcomer main path 4-1 and an upcomer branch path 4-2; the upcomer branch path 4-2 is in communication with the outlet pipe 1-3-1;

[0058] The downcomer main path 3-1 and the upcomer main path 4-1 are both arranged in the waste pot 1 side wall in communication between the flexible tube plates 1-1 connected on both sides of the heat exchange pipe bundle in the waste pot 1, the downcomer main path 3-1 is located above the lower flexible tube plate 1-1, and the upcomer main path 4-1 is located below the sealing partition plate 1-4.

[0059] In this embodiment: the whole waste heat boiler is arranged obliquely, the equipment axis is at an angle a with the vertical direction. The circulating water entering the interlayer will also partially vaporize in the interlayer due to heat absorption (but due to the small heat transfer area of the interlayer, the steam production will be much smaller than the main flow, and the volume fraction of steam will be <5%). After the waste heat boiler is arranged obliquely, the steam generated in the interlayer will naturally flow upwards along the lower surface of the flexible tube plate, which can reduce the risk of accumulation under the lower surface of the tube plate and improve the cooling effect.

[0060] The circulating water in the steam drum enters the bottom of the shell side of the waste heat boiler from the downcomer, continuously turns upwards in the shell side and exchanges heat with the tube bundle. Since the circulating water in the downcomer is in a near-saturated state, it will evaporate due to heat absorption and become saturated steam. Obviously, the more saturated water evaporated upwards, the greater the saturated steam content will be, and the volume fraction of saturated steam at the outlet will be ~50%. The exchanged circulating water (in a saturated steam state) enters the riser from the outlet at the upper part of the waste heat boiler and finally returns to the steam drum. Since the circulating water in the downcomer is in a near-saturated state, its density is that of water, while the circulating water in the shell side of the waste heat boiler and the riser is in a saturated steam state, so its density is smaller. The density difference between the media in the downward flow and the upward flow will form a pressure difference, causing the natural flow of the media, i.e. passive circulation.

[0061] The circulating power of the passive circulation waste heat boiler is due to the density difference between the media in the downward flow and the upward flow, which forms a pressure difference and causes flow. Obviously, the pressure difference and the density difference are related to the height difference, and the greater the density difference and the height difference, the greater the total pressure difference, the faster the flow, and the better the cooling effect. The circulating water from the downcomer has the same density in the main path of the downcomer and the branch path of the downcomer because it does not participate in heat exchange. The circulating water entering the riser has a lower density because the volume fraction of steam in the main path of the riser is ~50% and the volume fraction of steam in the branch path of the riser is only ~5%.

[0062] In order to ensure that the circulating water in the branch path of the downcomer has a small flow resistance, the branch path of the downcomer needs to be connected from the nearest part of the downcomer. In order to ensure that the branch path of the riser has a small flow resistance, the riser needs to be connected at a relatively close position; but at the same time, in order to ensure that the upward flow has a lower density, the riser needs to be connected at a horizontal position close to the circulating water outlet assembly, so that the density of the medium in the entire interlayer (i.e. the distance between the interlayer and the steam drum) is that of the main path of the riser. Not only is passive circulation achieved, but the cooling effect is also further improved.

[0063] Working principle: the scheme adopts passive form to cool the flexible tube plate, and the main components include: downcomer, riser, flexible tube plate, circulating water inlet assembly, circulating water outlet assembly, sealing partition, baffle plate, etc. The flexible tube plate and the sealing partition form a closed sandwich structure, the circulating water inlet assembly is arranged near the lower part, the circulating water outlet assembly is arranged near the upper part, the circulating water inlet assembly introduces circulating water from the downcomer, the circulating water flows in the sandwich to cool the flexible tube plate, and then flows into the circulating water outlet assembly, and finally returns to the riser. The baffle plate is arranged in the non-piping area on both sides of the sandwich to prevent short circuit. The cooling sandwich structure adopts natural circulation as the driving force, which is passive form, and the flexible tube plate is cooled and cooled in the small sandwich, which improves the stability of the flexible tube plate cooling and ensures that the flexible tube plate does not fail due to overtemperature.

Claims

1. A boiler system with a passive cooling sandwich structure of a waste boiler flexible tube sheet, characterized by: It includes a waste boiler (1), a steam drum (2), a downcomer (3), an upcomer (4) and a sandwich structure; The sandwich structure is used to be arranged in a vertical waste boiler (1), the sandwich structure is located at the upper part of the heat exchange tube bundle in the waste boiler (1), and the sandwich structure includes a flexible tube sheet (1-1), a circulating water inlet assembly (1-2), a circulating water outlet assembly (1-3) and a sealing partition (1-4); The flexible tube sheet (1-1) is connected to the top of the heat exchange tube bundle in the waste boiler (1) to fix the heat exchange tube bundle. The flexible tube sheet (1-1) and the sealing baffle (1-4) are fixed in the waste boiler (1) from top to bottom. A sandwich is formed between the flexible tube sheet (1-1) and the sealing baffle (1-4). The circulating water inlet assembly (1-2) and the circulating water outlet assembly (1-3) are connected to the waste boiler (1), and the circulating water inlet assembly (1-2) and the circulating water outlet assembly (1-3) are both connected to the sandwich. The circulating water inlet assembly (1-2) is arranged at the low point of the sandwich, and the circulating water outlet assembly (1-3) is arranged at the high point of the sandwich. The waste boiler (1) is arranged vertically and tilted, the axis of the waste boiler (1) forms an angle α with the vertical direction, and the steam drum (2) is placed above the waste boiler (1); The outlet end of the drum (2) is connected to the inlet end of the downcomer (3), the outlet end of the downcomer (3) is connected to the downcomer main line (3-1) and the downcomer branch line (3-2), and the downcomer branch line (3-2) is connected to the inlet pipe (1-2-1); The inlet end of the steam drum (2) is connected to the outlet end of the riser (4), and the inlet end of the riser (4) is connected to the riser main line (4-1) and the riser branch line (4-2); the riser branch line (4-2) is connected to the outlet pipe (1-3-1); The downpipe main path (3-1) and the uppipe main path (4-1) are both arranged on the side wall of the waste boiler (1) between the flexible tube sheets (1-1) connected on both sides of the heat exchange tube bundle in the waste boiler (1) and communicate with each other. The downpipe main path (3-1) is located above the lower flexible tube sheet (1-1), and the uppipe main path (4-1) is located below the sealing partition (1-4).

2. The boiler system of the waste boiler flexible tube sheet passive cooling sandwich structure according to claim 1, characterized in that: An upwardly disposed annular groove is provided between the flexible tube plate (1-1) and the inner wall of the waste pot (1).

3. The boiler system of the passive cooling sandwich structure of the waste boiler flexible tube sheet according to claim 1 is characterized in that: The sandwich structure further comprises at least one pair of baffles (1-5); Each pair of baffles (1-5) is symmetrically arranged in the interlayer and fixed on the inner wall of the waste pot (1).

4. The boiler system of the passive cooling sandwich structure of the waste boiler flexible tube sheet according to claim 1 is characterized in that: The sealing partition (1-4) comprises a partition (1-4-1), a plurality of ring plates (1-4-2) and a plurality of bolts (1-4-3); A plurality of ring plates (1-4-2) are fixed on the inner wall of the waste pot (1), a partition plate (1-4-1) is placed above the plurality of ring plates (1-4-2), and the partition plate (1-4-1) and each ring plate (1-4-2) are fixed by a bolt (1-4-3).

5. The boiler system of the passive cooling sandwich structure of the waste boiler flexible tube sheet according to claim 4 is characterized in that: A plurality of ring plates (1-4-2) are evenly distributed along the circumferential direction.

6. The boiler system of the passive cooling sandwich structure of the waste boiler flexible tube sheet according to claim 1 is characterized in that: The circulating water inlet assembly (1-2) comprises an inlet pipe (1-2-1) and a distribution pipe (1-2-2); The distribution pipe (1-2-2) is an arc-shaped curved pipe, the distribution pipe (1-2-2) is arranged in the interlayer, and a plurality of water outlet holes are evenly distributed on the distribution pipe (1-2-2); the inlet pipe (1-2-1) passes through the side wall of the waste pot (1) and is connected to the distribution pipe (1-2-2).

7. The boiler system of the waste boiler flexible tube sheet passive cooling sandwich structure according to claim 6, characterized in that: The inlet pipe (1-2-1) is connected to the middle of the distribution pipe (1-2-2).

8. The boiler system of the passive cooling sandwich structure of the waste boiler flexible tube sheet according to claim 1 is characterized in that: The circulating water outlet assembly (1-3) comprises an outlet connecting pipe (1-3-1), a main confluence pipe (1-3-2) and a plurality of branch pipes (1-3-3); The inlet ends of the multiple branch pipes (1-3-3) are connected to the interlayer, the outlet ends of the multiple branch pipes (1-3-3) are connected to the main confluence pipe (1-3-2) arranged outside the waste boiler (1), and the inlet end of the outlet pipe (1-3-1) is connected to the outlet end of the main confluence pipe (1-3-2).

Images