A kind of external reheating device for garbage power generation
By designing an external furnace reheating device for waste power generation, and using steam extraction from the steam turbine to reheat, the problem of reheating the reheater being easily corroded is solved, and efficient and reliable thermal efficiency improvement is achieved.
Patent Information
- Application Number
- CN202420169411.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-01-23
AI Technical Summary
The reheaters of waste power stations are easily corroded by the highly corrosive components in the flue gas, resulting in leakage and damage.
A reheating device outside the furnace was designed to reheat using steam extraction by a steam turbine to avoid the corrosive problem of reheating by flue gas. The device includes a shell, a tube bundle, a tube plate and a heating tube box. The tube bundle is composed of a U-shaped heating tube and is structured as a finned tube structure to improve the heat exchange efficiency and the pressure bearing capacity of the equipment.
The heat exchange surface of the reheater is not easily corroded, avoids leakage and damage, and improves the thermal efficiency of the power station and the reliability of the equipment.
Smart Images
Figure CN222732813U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of garbage power generation devices, and in particular relates to an external reheating device for garbage power generation. Background Art
[0002] At present, with the development of waste-to-energy technology, equipment design technology has become more mature, and users are increasingly concerned about the economic efficiency of power plants. In order to improve the economic efficiency of power plants, it is necessary to improve the thermal efficiency of power plants. From thermodynamics, we know that one of the ways to improve thermal efficiency is to reheat the steam that has done some work. The device that achieves this function is called a reheater. The reheater of a conventional coal-fired thermal power plant is placed in the flue of the boiler, and uses the waste heat of the flue gas to reheat the steam that has done some work to a higher temperature.
[0003] Due to the characteristics of the fuel in waste-to-energy plants, the flue gas contains a large amount of highly corrosive components such as chloride ions. If the reheater is placed in the boiler flue according to conventional practice, the heat exchange surface of the reheater will be corroded quickly, causing equipment leakage and damage.
[0004] Therefore, a new technology is needed to solve the problem in the prior art that the reheater is easily corroded, resulting in leakage and damage. Utility Model Content
[0005] In order to solve the above problems in the prior art, the utility model provides an external reheating device for garbage power generation, which has the effect that the heat exchange surface of the reheater is not easily corroded, leaked or damaged.
[0006] The utility model adopts the following technical solutions:
[0007] An off-furnace reheating device for garbage power generation, comprising a shell, a tube bundle, a tube sheet, and a heating tube box, wherein the shell is cylindrical, one end of the shell is detachably fixedly connected to the heating tube box, the tube sheet is located between an opening at one end of the shell and the heating tube box, a first inlet and a first outlet are provided on the heating tube box, the heating tube box is connected to a steam turbine unit through the first inlet, and the first outlet is located below the first inlet;
[0008] The tube bundle includes a plurality of U-shaped heating tubes, each of which is located in the shell, one end of each heating tube passes through the tube sheet and is connected to the first inlet, and the other end of each heating tube passes through the tube sheet and is connected to the first outlet, and each heating tube structure is a fin tube structure;
[0009] The bottom of the shell is provided with a second inlet for circulating steam to enter, and the second inlet is connected to the outer surface of the heating tube. The top of the shell is provided with a second outlet connected to the outer surface of the tube bundle, and the second outlet is used to output the heated steam.
[0010] As a further improvement of the technical solution of the utility model, it also includes a partition plate installed in the heating tube box, and the two end pipe openings of each heating tube are respectively located on the upper and lower sides of the partition plate. The partition plate is used to separate the two end pipe openings of each heating tube, and the first outlet is located below the partition plate, and the first inlet is located above the partition plate.
[0011] As a further improvement of the technical solution of the utility model, a drain outlet connected to the lower end of the heating tube is provided at the bottom of the heating tube box, and the drain outlet is located below the first outlet.
[0012] As a further improvement of the technical solution of the utility model, it also includes a separator, a mounting bracket for fixing the separator is fixed on the inner wall of the shell, the separator is located below the tube bundle, the steam input end of the separator is connected to the second inlet, the steam output end of the separator is connected to the outer surface of each of the heating tubes and transports steam to the outer surface of the heating tube, the separator is used to separate water from the steam, and a drain pipe for diverting water to the outside of the shell is installed at the lower part of the separator.
[0013] As a further improvement of the technical solution of the utility model, it also includes a steam distributor, which is installed in the shell near the second inlet and below the separator. The output end of the steam distributor is connected to the input end of the separator. The steam distributor is used to transport and evenly distribute the steam at the input end of the separator.
[0014] As a further improvement of the technical solution of the utility model, a lower lining is provided in the shell, the bottom of the lower lining is provided with a through hole for the drain pipe to pass through, the upper end of the lower lining is flush with the bottom of the separator, and the output end of the steam distributor is located above the lower lining.
[0015] As a further improvement of the technical solution of the utility model, it also includes a drain collector, the lower part of the separator is provided with a drainage end, the top of the drain collector is provided with a water inlet end connected to the drainage end, and the bottom of the drain collector is provided with a water outlet connected to the upper end opening of the drain pipe;
[0016] A passage for steam to pass through is provided between the lower lining and the outer side of the hydrophobic collector, and the steam distributor is used to evenly distribute the steam in the passage.
[0017] As a further improvement of the technical solution of the utility model, it also includes a water sealer, which is located between the drain pipe and the lower lining and is used to isolate the output end of the steam distributor from the bottom opening of the drain pipe.
[0018] As a further improvement of the technical solution of the utility model, two anti-short circuit baffles are vertically arranged on both sides of the tube bundle, each of the anti-short circuit baffles is parallel to the axis of the shell, each of the heating tubes is located between the two anti-short circuit baffles, and the steam output end of the separator is connected to the two anti-short circuit baffles.
[0019] As a further improvement of the technical solution of the utility model, it also includes a base, which is located at the bottom of the shell and is used to fix and support the shell. A first manhole for people to pass through is provided at one end of the shell away from the heating pipe box, and a second manhole for people to pass through is provided on the top of the shell.
[0020] Compared with the prior art, the beneficial effects of the utility model are:
[0021] The steam turbine extraction inputs the heating steam into the heating pipe box through the first inlet, and the heating steam enters each heating pipe from the upper end of the heating pipe. The heating steam in the heating pipe heats the circulating steam with a lower temperature flowing outside each heating pipe. The circulating steam is heated and output from the second outlet. The heated circulating steam is discharged from the second outlet pipe seat located at the top of the shell body and enters the low-pressure cylinder of the steam turbine to continue to work, while the heating steam in the heating pipe flows out from the lower end of each heating pipe and is discharged from the first outlet. The high-temperature steam turbine extraction steam is used to reheat the exhaust steam of the intermediate-pressure cylinder to achieve the reheating effect, avoiding the corrosive problem of using flue gas reheating. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0023] Figure 1 It is a cross-sectional view of the overall structure of the utility model;
[0024] Figure 2 This is the main view of the overall structure of the utility model;
[0025] Figure 3 is a cross-sectional view of the interior of the shell;
[0026] Figure 4 It is a left view of the overall structure of the utility model;
[0027] Figure 5 It is a right view of the overall structure of the utility model.
[0028] Reference numerals:
[0029] 1-right saddle support; 2-drain pipe; 3-shell; 4-right head; 5-pipe box flange; 6-first drain pipe seat; 7-pipe box head; 8-pipe box body; 9-first steam inlet pipe seat; 10-transition cylinder section; 11-second manhole; 12-second outlet; 13-safety valve seat; 14-left head; 15-first manhole; 16-drain outlet; 17-left saddle support; 18-second drain pipe seat; 19-second steam inlet pipe seat; 20-steam balance pipe seat; 21-first steam outlet pipe seat; 22-tube sheet; 23-tube bundle; 24-radial baffle; 25-separator; 26-drain pipe; 27-steam distributor; 28-lower lining; 29-mounting bracket; 30-drain collector; 31-support roller frame; 32-water seal; 33-axial baffle; 34-pass partition. DETAILED DESCRIPTION
[0030] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.
[0031] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the accompanying drawings.
[0032] Reference Figures 1 to 5 , an off-furnace reheating device for waste power generation, comprising a shell 3, a tube bundle 23, a tube sheet 22, and a heating tube box. The shell 3 is cylindrical, and one end of the shell 3 is detachably fixedly connected to the heating tube box. The tube sheet 22 is located between the opening of one end of the shell 3 and the heating tube box. One end of the heating tube box is provided with a tube box flange 5 that is connected to the tube sheet 22, and the other end is provided with a tube box head 7. The heating tube box is provided with a first inlet and a first outlet, and the first outlet is located below the first inlet. The heating tube box is connected to the steam turbine unit through the first inlet, and steam extraction heating is used by the steam turbine to replace the traditional flue gas heating. The off-furnace reheating device for waste power generation of this scheme is independent of the furnace of waste power generation, and can be installed outside the furnace of waste power generation to avoid corrosion from the flue gas in the furnace. The tube bundle 23 is supported by the support roller at the bottom of the tube bundle 23. The support roller facilitates the assembly of the tube bundle 23 into the shell cylinder during the equipment manufacturing process.
[0033] The tube bundle 23 includes a number of U-shaped heating tubes, each of which is located in the shell 3. One end of each heating tube passes through the tube sheet 22 to communicate with the first inlet, and the other end of each heating tube passes through the tube sheet 22 to communicate with the first outlet. Each heating tube structure is a fin tube structure. Each heating tube in the tube bundle 23 adopts a low-rib high-density fin tube for enhanced heat transfer, making the equipment structure more compact. Each heating tube is located in the shell 3, and the circulating steam with a lower temperature and a larger volume flow rate is connected to the inside of the shell 3. The heating steam with a higher temperature and a smaller volume flow rate is passed into each heating tube. The heating steam with a higher pressure flows only in the heating tube box and the tube bundle 23, and does not contact other structures in the shell 3, and will not affect these structures, so that the overall structure of the waste-to-energy furnace reheating device of this scheme has a stronger pressure bearing capacity and reliable structural strength. The tube bundle 23 adopts a high-density fin tube, which increases the heat exchange area per unit volume, saves space, and at the same time improves the heating efficiency of low-temperature steam. The heating tube box and the tube bundle 23 are connected by flange bolts, which is convenient for installation and inspection of the welding joint between the tube bundle 23 and the tube sheet 22 during shutdown and maintenance.
[0034] The shell 3 is provided with a second inlet at the bottom, which is connected to the exhaust end of the intermediate pressure cylinder. The circulating steam with a lower temperature discharged from the exhaust end of the intermediate pressure cylinder can enter the shell 3 through the second inlet and be heated again by the tube bundle 23. The second inlet is connected to the outer surface of the heating tube. The shell 3 is provided with a second outlet 12 connected to the outer surface of the tube bundle 23 at the top, and the second outlet 12 is used to output the heated steam. Among them, a second steam inlet pipe seat 19 connected to the exhaust end of the intermediate pressure cylinder is installed at the second inlet, and the second steam inlet pipe seat 19 can allow the circulating steam with a lower temperature discharged from the exhaust end of the intermediate pressure cylinder to pass through.
[0035] Specifically, the off-furnace reheating device for waste power generation of this scheme also includes a partition plate 34 installed in the heating pipe box, and the two end pipe openings of each heating pipe are respectively located on the upper and lower sides of the partition plate 34. The partition plate 34 is used to separate the two end pipe openings of each heating pipe. The first outlet is located below the partition plate 34, and the first inlet is located above the partition plate 34. The first inlet is installed with a first steam inlet pipe seat 9.
[0036] Specifically, the bottom of the heating pipe box is provided with a drain port connected to the lower end of the heating pipe, and the drain port is located below the first outlet. The steam turbine extraction inputs the heating steam into the heating pipe box through the first inlet, and the heating steam enters each heating pipe from the upper end of the heating pipe. The heating steam in the heating pipe heats the circulating steam with a lower temperature flowing outside each heating pipe. After the circulating steam is heated, it is output from the second outlet 12. The second outlet 12 is equipped with a second steam outlet pipe seat. The heated circulating steam is discharged from the second outlet 12 pipe seat located at the top of the shell body and enters the low-pressure cylinder of the steam turbine to continue to work, while the heating steam in the heating pipe flows out from the lower end of each heating pipe and is discharged from the first outlet. Since the temperature of the heating steam will decrease during this process, part of the water vapor contained in the heating steam will condense into water and flow out from the drain port. The high-temperature steam turbine extraction steam is used to reheat the exhaust steam of the intermediate pressure cylinder to achieve the reheating effect, avoiding the corrosive problem of using flue gas reheating.
[0037] The first inlet is provided with a steam inlet pipe seat for passing the heating steam, the first outlet is provided with a first steam outlet pipe seat 21 for the steam after passing through the tube bundle 23, and the drain outlet is provided with a first drain pipe seat 6. The heating steam enters the heating tube box through the heating steam inlet pipe seat located at the top of the heating tube box, and a partition plate 34 is provided at the central section of the heating tube box, and the partition plate 34 is welded and fixed to the inner wall of the heating tube box. A groove is provided on the tube sheet 22 for the partition plate 34 to be embedded, and the bottom edge plane of the groove is flush with the sealing surface of the flange of the tube sheet 22. The assembly consisting of the partition plate 34 and the heating tube box is connected to the tube sheet 22 through a sealing gasket and bolts. The heating steam enters the straight tube part of each heating tube in the tube bundle 23 from the upper tube opening of each heating tube, flows through the U-shaped bend part and then flows out from the lower straight tube opening. The heating steam condenses during the flow in the tube, releases latent heat to the tube bundle 23, and transfers the heat to the circulating steam flowing laterally outside the tube bundle 23, so as to achieve the purpose of heating the circulating steam again by using the steam latent heat. An exhaust pipe seat is provided at the lower part of the heating tube box, which is used to connect to the external exhaust pipe to continuously discharge the uncondensed gas under the partition plate 34 in the heating tube box. In order to facilitate the smooth discharge of the water after the heating steam condenses, a first drain pipe seat 6 is provided at the bottom of the heating tube box to discharge the condensed water.
[0038] Specifically, the heating pipe box includes a cylindrical pipe box body 8, one end of which is provided with a pipe box flange 5 connected to the tube sheet 22, and the other end is provided with a pipe box head 7, and the first drainage pipe seat 6, the first steam inlet pipe seat 9, and the first steam outlet pipe seat 21 are all installed on the pipe box body 8.
[0039] Specifically, the waste power generation external reheating device of this scheme also includes a separator 25, which is a corrugated plate type. The corrugated plate separation unit can separate steam and water from low-humidity circulating steam, which can reduce the consumption of heating steam and improve the thermal efficiency of the unit. A mounting bracket 29 for fixing the separator 25 is fixed on the inner wall of the shell 3. The separator 25 is located below the tube bundle 23. The steam input end of the separator 25 is connected to the second inlet, and the steam output end of the separator 25 is connected to the outer surface of each heating tube and transports steam to the outer surface of the heating tube. The dry steam coming out of the output end of the separator 25 flows horizontally through the tube bundle 23, absorbs the heat released by the heating steam in the tube on the outer surface of the tube bundle 23, and is heated to the designed temperature. The separator 25 is used to separate the moisture in the steam, and at least one drain pipe 26 for diverting the water body to the outside of the shell 3 is installed at the lower part of the separator 25. The function of the separator 25 is to separate the moisture in the circulating steam at the outlet of the steam distributor 27, reduce the flow of heating steam consumed by the reheating device, and improve the thermal efficiency of the steam turbine unit.
[0040] Specifically, the waste-to-energy external reheating device of this solution further includes a steam distributor 27, which is installed in the shell 3 near the second inlet and below the separator 25. The output end of the steam distributor 27 is connected to the input end of the separator 25, and the steam distributor 27 is used to transport and evenly distribute the steam at the input end of the separator 25. The steam distributor 27 has the function of preventing direct steam scouring on the one hand, and the function of guiding flow on the other hand, so that the steam is evenly distributed in the shell 3. A steam inlet pipe seat is provided at the second inlet, and the steam inlet pipe seat is installed outside the shell 3. The circulating steam enters the shell 3 from the steam inlet pipe seat at the lower part of the shell 3. After passing through the steam distributor 27, the steam is evenly distributed in the cylinder, which can improve the efficiency and reliability of the separator 25 for separating water in the steam, and improve the efficiency of heating the tube bundle 23; avoid the phenomenon that part of the steam is not heated to a certain temperature range due to uneven distribution of steam in the shell 3, thereby avoiding the phenomenon that part of the steam with a lower temperature is output from the second outlet 12, and improve the reliability of heating the tube bundle 23; the steam in the shell 3 does not need to flow a long path to form a uniform distribution state, thereby reducing the steam pressure loss.
[0041] Specifically, the shell 3 is provided with an inner liner 28, which covers the inner wall of part of the shell 3 and matches the inner wall structure of this part of the shell 3. There may be a certain gap between the inner liner 28 and the inner wall of this part of the shell 3. The provision of the inner liner 28 can protect the inner wall of the shell 3 and prevent wet steam from eroding the inner wall of the shell 3. The bottom of the inner liner 28 is provided with through holes for each of the drain pipes 26 to pass through, and the through holes correspond to the drain pipes 26 one by one. The upper end of the inner liner 28 is flush with the bottom of the separator 25, and the output end of the steam distributor 27 is located above the inner liner 28.
[0042] Specifically, the waste-to-energy external reheating device of this scheme also includes a drain collector 30, a drain end is provided at the lower part of the separator 25, a water inlet end connected to the drain end is provided at the top of the drain collector 30, and a water outlet connected to the upper end opening of the drain pipe 26 is provided at the bottom of the drain collector 30. There is a passage for steam to pass between the lower lining 28 and the outer side of the drain collector 30, and the steam distributor 27 is used to evenly distribute the steam in the passage. The water separated by the separator 25 is collected by the drain collector 30 and discharged from the drain pipe 26, so that the separated water can be discharged smoothly, and this part of the discharged water will not be carried by the steam to enter the steam turbine from the second outlet 12.
[0043] Specifically, the waste-to-energy reheating device of this solution further includes a water seal 32 corresponding to the drain pipe 26 and a second drain pipe seat 18 corresponding to the drain pipe 26. Each second drain pipe seat 18 is installed on the shell 3. Each water seal 32 is located between each drain pipe 26 and the lower lining 28. The water seal 32 has a sealing and isolating function, and is used to isolate the output end of the steam distributor 27 from the bottom opening of the drain pipe 26 to prevent steam from escaping from the bottom opening of the drain pipe 26 to the outside of the shell 3. The bottom opening of each drain pipe 26 is connected to a second drain pipe seat 18, and each drain pipe 26 is connected to the outside of the shell 3 through the second drain pipe seat 18. The separated water is discharged from each second drain pipe seat 18 to the outside of the shell 3.
[0044] Specifically, two axial baffles 33 are vertically provided on both sides of the tube bundle 23, and the two axial short-circuit prevention baffles are fixed on the inner wall of the shell 3. Each of the axial baffles 33 is parallel to the axis of the shell 3, and each of the heating tubes is located between the two axial baffles 33. The steam output end of the separator 25 is connected to the two axial baffles 33.
[0045] Specifically, the waste-to-energy external reheating device of the present solution further includes a support roller frame 31 for fixing the support tube bundle 23. The support roller frame 31 is located at the bottom of the tube bundle 23. A plurality of rollers are provided at the bottom of the support roller frame 31. The movement of the tube bundle 23 during installation and positioning is achieved by rolling the rollers, so that the tube bundle 23 is conveniently moved to a suitable position. The arrangement of the support roller frame 31 enables the relative positions of the heating tubes in the tube bundle 23 to remain stable.
[0046] Specifically, two radial baffles 24 are further provided in the shell 3, and the two radial baffles 24 are respectively located at the two ends of the separator 25, and each radial baffle 24 is perpendicular to the axis of the shell 3 to prevent steam bypass, and the circulating steam in the cylinder is concentrated in the area where the separator 25 is arranged, so as to avoid the reduction of thermal efficiency of the circulating steam in the shell 3 due to the fact that part of the circulating steam has not passed through the separator 25 to separate the water, thereby improving the heating efficiency and reliability of the reheating device.
[0047] Specifically, the waste-to-energy external reheating device of this scheme also includes a base, which can be preferably a saddle support structure, used to support the weight of the device as a whole and the fluid, and the base includes a left saddle support 17 and a right saddle support 1 arranged at intervals on the left and right. The base is located at the bottom of the shell 3 and is used to fix and support the shell 3. A safety valve seat 13 is provided on the top of the shell 3. The safety valve seat 13 is used to release pressure when the air pressure in the shell 3 is too high. A number of sewage pipes 2 are provided at the bottom of the shell 3 to discharge sewage and other dirt during cleaning. A first manhole 15 is provided on the end of the shell 3 away from the heating pipe box for people to pass through, and a second manhole 11 is provided on the top of the shell 3 for people to pass through. The first manhole 15 and the second manhole 11 form two inspection channels for people to pass through. The provision of the two inspection channels facilitates people to enter the cylinder for inspection during manufacturing and shutdown inspection. The first manhole 15 and the second manhole 11 are both provided with sealing covers that can be opened or closed.
[0048] Specifically, the off-furnace reheating device for waste power generation of this scheme also includes a steam balancing pipe seat 20 and a drain tank. The second drainage pipe seat 18 is connected to the drain tank. The drain tank is installed outside the shell 3. The steam balancing pipe seat 20 is arranged on the shell 3 and is connected to the gas phase space of the external drain tank, so as to facilitate the smooth discharge of the separated water.
[0049] Specifically, the waste-to-energy external reheating device of this scheme also includes a cylindrical transition cylinder section 10, which can be passed through by the tube bundle 23. The left and right ends of the shell 3 are respectively provided with a left head 14 and a right head 4 in a shape of approximately hemispherical surfaces. The left head 14 and the right head 4 are used to seal the two ends of the shell. The right head 4 is located at the end close to the heating tube box. The two ends of the transition cylinder section 10 are respectively tightly connected to the tube sheet 22 and the right head 4, and the transition cylinder section 10 is connected to the shell 3. Among them, the first manhole 15 is arranged on the left head 14, and the bottom of the shell 3 close to the left head 14 is provided with a sewage outlet 16 for sewage discharge during cleaning. The sewage outlet 16 is vertically arranged and opens downward. The left saddle support 17 is located at the bottom of the shell 3 and close to the left head 14, and the right saddle support 1 is located at the bottom of the shell 3 and close to the right head 4.
[0050] Example 1
[0051] The waste-to-energy external reheating device of this scheme is used to reheat the circulating steam. Taking a 50MW ultra-high pressure waste incineration power generation project with an external reheating system as an example, the circulating steam pressure discharged from the medium pressure cylinder is 0.65MPa, the exhaust steam dryness is 92.5%, the steam flow rate is 43.5kg / s, the heating steam extraction pressure is 1.7MPa, and the dryness is 0.99. After adopting the external reheating device, the circulating steam dryness after the separator 25 can reach 99.5%, the circulating steam temperature can reach a superheat of 35°C, and the consumption of heating steam is 1.9kg / s.
[0052] The outer diameter of the shell of the off-furnace reheating device of this project is 2100mm, the effective heat exchange straight tube section length of tube bundle 23 is 4000mm, the total length of the device is 7000mm, and the total weight of the device is approximately 16000Kg.
[0053] For other contents of the external reheating device for garbage power generation described in the utility model, please refer to the prior art and will not be repeated here.
[0054] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. An external reheating device for garbage power generation, characterized in that: The invention comprises a shell, a tube bundle, a tube sheet, and a heating tube box. The shell is cylindrical, one end of the shell is detachably fixedly connected to the heating tube box, the tube sheet is located between an opening at one end of the shell and the heating tube box, the heating tube box is provided with a first inlet and a first outlet, the heating tube box is connected to the steam turbine unit through the first inlet, and the first outlet is located below the first inlet; The tube bundle includes a plurality of U-shaped heating tubes, each of which is located in the shell, one end of each heating tube passes through the tube sheet and is connected to the first inlet, and the other end of each heating tube passes through the tube sheet and is connected to the first outlet, and each heating tube structure is a fin tube structure; The bottom of the shell is provided with a second inlet for circulating steam to enter, and the second inlet is connected to the outer surface of the heating tube. The top of the shell is provided with a second outlet connected to the outer surface of the tube bundle, and the second outlet is used to output the heated steam.
2. The waste-to-energy reheating device according to claim 1, characterized in that: It also includes a partition plate installed in the heating tube box, and the two end pipe openings of each heating tube are respectively located on the upper and lower sides of the partition plate. The partition plate is used to separate the two end pipe openings of each heating tube, the first outlet is located below the partition plate, and the first inlet is located above the partition plate.
3. The waste-to-energy external reheating device according to claim 2, characterized in that: The bottom of the heating pipe box is provided with a drain outlet which is connected with the lower end of the heating pipe, and the drain outlet is located below the first outlet.
4. The waste-to-energy external reheating device according to claim 1, characterized in that: It also includes a separator, a mounting bracket for fixing the separator is fixed on the inner wall of the shell, the separator is located below the tube bundle, the steam input end of the separator is connected to the second inlet, the steam output end of the separator is connected to the outer surface of each heating tube and transports steam to the outer surface of the heating tube, the separator is used to separate water from the steam, and a drain pipe for diverting water to the outside of the shell is installed at the lower part of the separator.
5. The waste-to-energy external reheating device according to claim 4, characterized in that: It also includes a steam distributor, which is installed in the shell near the second inlet and below the separator. The output end of the steam distributor is connected to the input end of the separator. The steam distributor is used to transport and evenly distribute the steam at the input end of the separator.
6. The waste-to-energy external reheating device according to claim 5, characterized in that: A lower liner is arranged in the shell, a through hole is arranged at the bottom of the lower liner for the drain pipe to pass through, the upper end of the lower liner is flush with the bottom of the separator, and the output end of the steam distributor is located above the lower liner.
7. The waste-to-energy external reheating device according to claim 6, characterized in that: It also includes a drain collector, wherein the lower part of the separator is provided with a drain end, the top of the drain collector is provided with a water inlet end connected with the drain end, and the bottom of the drain collector is provided with a water outlet connected with the upper end opening of the drain pipe; A passage for steam to pass through is provided between the lower lining and the outer side of the hydrophobic collector, and the steam distributor is used to evenly distribute the steam in the passage.
8. The waste-to-energy external reheating device according to claim 7, characterized in that: It also includes a water sealer, which is located between the drain pipe and the lower lining and is used to isolate the output end of the steam distributor from the bottom opening of the drain pipe.
9. The waste-to-energy external reheating device according to claim 6, characterized in that: Two anti-short circuit baffles are vertically arranged on both sides of the tube bundle, each of the anti-short circuit baffles is parallel to the axis of the shell, each of the heating tubes is located between the two anti-short circuit baffles, and the steam output end of the separator is connected to the two anti-short circuit baffles.
10. The waste-to-energy external reheating device according to claim 1, characterized in that: It also includes a base, which is located at the bottom of the shell and is used to fix and support the shell. A first manhole for people to pass through is provided at one end of the shell away from the heating pipe box, and a second manhole for people to pass through is provided on the top of the shell.