Steam generator and steam generation system

Abstract

The embodiment of the utility model provides a steam generator and a steam generation system, and relates to the technical field of waste heat utilization. The steam generator comprises a gas phase area, a heat exchange area and a water supplementing area which are vertically distributed and flat tube plates arranged among the areas, the steam generator is vertically arranged, the size of the steam generator is far smaller than that of a horizontal threaded light tube type waste heat utilization device under the same heat exchange area, smoke resistance is small, the power of auxiliary machines such as an induced draft fan does not need to be additionally increased, and more energy is saved. The heat exchange area comprises a plurality of heat exchange tubes with fins, so that the heat exchange effect is good, and the heat efficiency is higher; a liquid level meter is further arranged on the outer side of the barrel of the steam generator; and the automatic water replenishing function can be achieved, and the characteristics of high safety coefficient and few overhaul times are achieved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, and more specifically, to a steam generator and a steam generation system. Background Technology

[0002] Chemical plants typically have large flue gas volumes in their tail gas incineration or heating systems, generally exceeding 50,000 cubic meters. Furthermore, the flue gas treated by these systems is at a high temperature, around 270℃-300℃. Direct discharge of such flue gas would result in a significant waste of heat.

[0003] Existing waste heat recovery devices are generally horizontally arranged, requiring a large heat exchange area from the heat exchanger to fully utilize waste heat. However, threaded smooth tube heat exchangers have a small heat exchange area, resulting in limited heat exchange efficiency and utilization. This leads to long threaded flue tubes, typically exceeding 5 meters, and a large number of them are required, resulting in excessively large equipment size, large footprint, high manufacturing costs, and cumbersome maintenance. The large size and weight also cause excessive resistance to flue gas, necessitating increased power from auxiliary equipment such as induced draft fans, leading to higher energy consumption and increased production costs. Furthermore, the heat exchanger tube connecting plates are mostly flat, requiring manual welding on one side, which makes them susceptible to corrosion, cracking, deformation, and leakage during later operation. Therefore, there is an urgent need for a waste heat recovery device with high heat exchange efficiency, small size, low manufacturing and maintenance costs, and a high safety factor to solve these technical problems.

[0004] Therefore, this application is hereby submitted. Utility Model Content

[0005] The purpose of this invention is to provide a steam generator and a steam generation system to solve the above-mentioned technical problems.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, embodiments of this utility model provide a steam generator, which includes a vertically distributed gas phase zone, a heat exchange zone, a water replenishment zone, and a flat tube sheet disposed between the zones; the flat tube sheet includes a first flat tube sheet and a second flat tube sheet; the gas phase zone is located at the upper end of the steam generator and includes a steam-water separation device; the heat exchange zone is located between the gas phase zone and the water replenishment zone and includes multiple finned heat exchange tubes and a first flat tube sheet and a second flat tube sheet connected to both ends of the heat exchange tubes; a flue inlet and a flue outlet are provided oppositely disposed on the cylinder of the heat exchange zone; the water replenishment zone is located at the lower end of the steam generator and includes a water inlet; a level gauge is also provided on the outside of the cylinder of the steam generator.

[0008] In an optional embodiment, the steam generator is further provided with a safety valve port, a temperature measuring port, a pressure measuring port, a main steam outlet, and an inlet / outlet manhole on the top cover of the head in the gas phase zone.

[0009] In an optional embodiment, the steam-water separator has multiple vents for the flow of main steam; the steam-water separator is located directly below the main steam outlet, and no vents are provided at the location corresponding to the main steam outlet.

[0010] In an optional embodiment, one end of the flat tube sheet has the same diameter as the inner diameter of the steam generator cylinder, and the other end has a transition flange with an arc. The transition flanges with arcs in the first and second flat tube sheets are arranged opposite each other close to the heat exchange zone, and multiple sets of corresponding heat exchange tube openings are provided on the first and second flat tube sheets. Multiple heat exchange tubes are connected to the first and second flat tube sheets respectively through multiple sets of corresponding heat exchange tube openings. The transition flange with arcs in the third flat tube sheet is arranged away from the water replenishment zone.

[0011] In an optional embodiment, the level gauge includes a level sensor, a remote transmitter, and a controller, wherein the level sensor and the remote transmitter are respectively communicatively connected to the controller for monitoring and reading the water level inside the heat exchange tube.

[0012] In an optional implementation, the level gauge is equipped with a minimum safe water level, a normal water level, and a maximum safe water level with a relative height difference of 50 mm. The height of the normal water level is the same as the vertical height of the top fins in the heat exchange tube. When the water level in the steam generator is lower than the minimum safe water level, the level sensor controls the water pump through the controller to automatically replenish water through the inlet.

[0013] In an optional implementation, a sampler is connected to one end of the level gauge near the base for sampling water inside the steam generator.

[0014] In an optional embodiment, the tube sheet further includes a third tube sheet; the third tube sheet is disposed at the end of the water replenishment zone away from the heat exchange zone; the end of the third tube sheet away from the water replenishment zone is also provided with a base, and the base is not provided with an insulation layer; the outer sides of the cylinders of the gas phase zone, the heat exchange zone and the water replenishment zone are all provided with an insulation layer.

[0015] In an optional embodiment, an anti-impact plate is provided on the inner side of the steam generator near the water inlet, and a sleeve is also provided at the interface of the water inlet to reduce the impact of the incoming water on the steam generator and the thermal stress.

[0016] Secondly, embodiments of this utility model provide a steam generating system, which includes the aforementioned steam generator, thermometer, pressure gauge, safety valve, and water pump.

[0017] The beneficial effects provided by the embodiments of this utility model include:

[0018] The steam generator provided in this embodiment is vertically arranged, and the heat exchange tubes are in the form of finned tubes, which has a good heat exchange effect and higher thermal efficiency. The volume of the vertically arranged steam generator is much smaller than that of the horizontal threaded tube type waste heat utilization device with the same heat exchange area. It has low flue gas resistance and does not require additional power to auxiliary equipment such as induced draft fans, making it more energy-efficient. In addition, it is small and lightweight, which facilitates inspection and maintenance and reduces manufacturing and production costs. It realizes automatic water replenishment function and has the characteristics of high safety factor and low maintenance frequency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the steam generator provided in this embodiment from a first-view perspective;

[0021] Figure 2 This is a schematic diagram of the steam generator provided in this embodiment from a second perspective.

[0022] Figure 3 These are schematic diagrams of the steam-water separation device provided in this embodiment from different perspectives.

[0023] Figure 4 Schematic diagrams of the flat tube sheets at both ends of the heat exchange zone provided in this embodiment from different perspectives;

[0024] Figure 5 This is a schematic diagram of the heat exchange tube provided in this embodiment;

[0025] Figure 6 These are schematic diagrams of the anti-impact plate provided in this embodiment from different perspectives.

[0026] Figure 7 This is a schematic diagram of the liquid level gauge provided in this embodiment;

[0027] Figure 8 This is a schematic diagram of the structure of the inlet interface provided in this embodiment;

[0028] Figure 9 The diagram shows the structure of the third flat tube sheet provided in this embodiment from different perspectives.

[0029] Icons: 100-Steam generator; 101-Insulation layer; 102-Temperature measuring port; 103-Pressure measuring port; 104-Main steam outlet; 105-Safety valve port; 106-Manhole; 110-Flange; 200-Vacuum phase zone; 201-Steam-water separator; 210-Steam-water separator base plate; 213-Directly below the main steam outlet; 215-Vacuum vent; 300-Heat exchange zone; 301-First flat tube sheet; 302-Heat exchange tube; 303-Fluorisen inlet; 304-Fluorisen outlet; 305-Then... 310-Fin; 321-Transition flange with rounded edge; 322-Bottom plate of tube sheet; 323-Heat exchange tube inlet; 400-Make-up water zone; 401-Anti-surge plate; 402-Inlet; 403-Shell; 404-Third tube sheet; 405-Drain port; 410-Interface of inlet; 500-Magnetic level gauge; 501-First valve; 502-Second valve; 503-Third valve; 505-Highest safe water level; 506-Normal water level; 507-Minimum safe water level. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0036] The following describes in detail the overall structure, working principle, and technical effects of the steam generation system provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0037] First Embodiment

[0038] This embodiment provides a steam generation system, which includes a steam generator 100, a thermometer, a pressure gauge, a safety valve, and a water pump.

[0039] Please refer to Figure 1 and Figure 2 The steam generator 100 provided in this embodiment includes a vertically distributed gas phase zone 200, a heat exchange zone 300, a water replenishment zone 400, and a flat tube sheet disposed between each zone.

[0040] It should be noted that the steam generator 100 in this embodiment is arranged vertically, and its volume is much smaller than that of a horizontal threaded tube type waste heat utilization device with the same heat exchange area.

[0041] The vapor phase zone 200 is located at the upper end of the steam generator 100, specifically the area between the normal water level 506 of the magnetic float level gauge 500 and the top cover of the end cap; the vapor phase zone 200 includes a steam-water separation device 201; on the cylinder of the steam generator 100 away from the heat exchange zone 300 in the vapor phase zone 200, that is, on the top cover of the steam generator 100, a safety valve port 105, a temperature measuring port 102, a pressure measuring port 103, a main steam outlet 104, and an inlet / outlet manhole 106 are also provided.

[0042] In addition, the head cover in the gas phase zone 200 is connected to the lower end of the cylinder via flange 110, which facilitates disassembly and maintenance.

[0043] It should be noted that the safety valve port 105 is connected to the safety valve, which ensures the safe operation of the steam generator 100 by releasing excess pressure and prevents it from being damaged due to overpressure. When the internal pressure of the steam generator 100 exceeds the set value, the safety valve will act quickly and release the excess pressure to the external environment through the hole on the valve body, thereby ensuring the normal operation and safety of the equipment.

[0044] Temperature measuring port 102 is connected to a thermocouple thermometer, which can quickly sense temperature changes and is used to monitor the internal temperature of the steam generator 100 in real time. Pressure measuring port 103 is connected to a pressure gauge, which is used to monitor the internal pressure of the steam generator 100 and, in conjunction with the safety valve, maintain the pressure balance inside the steam generator 100 in real time to ensure safe operation. Manhole 106 facilitates the entry and exit of operators to the steam generator 100 and to perform cleaning, inspection, and maintenance work on the internal components of the steam generator 100. In other embodiments of this utility model, the model and specifications of the thermometer and pressure gauge can be reasonably selected according to actual needs.

[0045] The main steam outlet 104 is used to discharge the steam after heat exchange inside the steam generator 100, and a steam-water separator 201 is installed directly below it.

[0046] It should be noted that, please refer to Figure 3 The diagram shows the structure of the steam-water separator 201 from different perspectives, where (a) is the front view, (b) is the side view, and (c) is the top view. In this embodiment, the steam-water separator 201 is enclosed by a steel plate of a certain thickness and is located directly below the main steam outlet 213. Multiple air holes 215 for the flow of main steam are evenly arranged on the bottom plate 210 of the steam-water separator. The diameter of the air holes 215 is 5mm-15mm. To prevent water from being carried away by the steam, no holes are made at the steam-water separator 201 corresponding to the main steam outlet 104.

[0047] Specifically, in this embodiment, the diameter of the vent 215 is 10mm. In other embodiments of this utility model, the diameter of the vent 215 can be reasonably adjusted according to actual needs. The number of vents 215 is reasonably arranged according to the actual size of the bottom plate 210 of the gas-water separator and the diameter of the vents 215.

[0048] The tube sheet includes a first tube sheet 301, a second tube sheet 305, and a third tube sheet 404 arranged sequentially from top to bottom. Please refer to... Figure 4 The diagram shows the structure of the flat tube sheet at both ends of the heat exchange zone from different perspectives. Taking the first flat tube sheet 301 as an example, (a) is the front view rotated 90° clockwise, and (b) is the top view. The diameter of one end of the flat tube sheet bottom plate 322 is the same as the inner diameter of the steam generator 100 cylinder, and the other end is a transition flange 321 with a rounded arc.

[0049] It should be noted that the flat tube sheet is designed with a rounded transition flange 321, which allows for automatic submerged arc welding when welding it to the cylinder, reducing labor costs and improving welding quality. Furthermore, the rounded transition reduces or eliminates stress concentration caused by temperature differences at the flat weld, minimizing the possibility of leakage. In other embodiments of this invention, the connection method between the flat tube sheet and the cylinder can be reasonably selected and replaced according to actual needs.

[0050] The heat exchange zone 300 is located in the middle of the steam generator 100, between the gas phase zone 200 and the water replenishment zone 400. Specifically, it is the area between the normal water level 506 of the magnetic float level gauge 500 and the bottom plate 322 of the second flat tube plate 305. The first flat tube plate 301 and the second flat tube plate 305 have arc-shaped transition edges 321 that are close to the heat exchange zone 300 and are positioned opposite each other. The first flat tube plate 301 and the second flat tube plate 305 have multiple sets of corresponding heat exchange tube openings 323. Multiple heat exchange tubes 302 are connected to the first flat tube plate 301 and the second flat tube plate 305 through the multiple sets of corresponding heat exchange tube openings 323. The heat exchange tubes 302 are arranged parallel to the cylinder of the steam generator 100 and perpendicular to the flat tube plate.

[0051] The number of heat exchange tube inlets 323 is designed reasonably based on the actual diameter of the flat tube sheet. The reasonable design of the number of heat exchange tubes 302 affects the flow rate of flue gas and the heat exchange effect during the heat exchange process.

[0052] It should be noted that, please refer to Figure 5 The heat exchange tube 302 is a finned heat exchange tube 310, which can prolong the residence time of flue gas in the heat exchange zone 300, enhance the heat exchange effect, and allow the heat in the flue gas to be fully exchanged with the cooling water in the finned tube 310. In addition, the vertically installed finned heat exchange tube 302 can make full use of the vertical space, making the layout of the entire system more compact and reasonable. Especially when the space is limited, it can save space. Therefore, under the same heat exchange area, the steam generator 100 has higher thermal efficiency and better heat exchange effect. Moreover, the equipment is vertical, compact in size, occupies a small area, has low manufacturing cost, and requires fewer leak repairs, making it convenient to maintain.

[0053] The heat exchange zone 300 has a flue inlet 303 and a flue outlet 304 that are arranged opposite to each other. The flue gas exchanges heat in the heat exchange zone 300 and heats the softened water in the finned tube 310.

[0054] It should be noted that the flue inlet 303 and flue outlet 304 are located on the side wall of the cylinder, and the direction of flue gas in and out is perpendicular to the arrangement direction of heat exchange tubes 302 in the heat exchange zone 300. This design extends the residence time of flue gas in the heat exchange zone 300, thereby improving the heat exchange efficiency.

[0055] Please refer to Figure 2 and Figure 7In this embodiment, to protect the heat exchange tube 302 from dry burning and deformation of the fins 310, the upper and lower connecting pipes of the level gauge are connected to the cylinder of the heat exchange zone 300 and the cylinder of the water replenishment zone 400, respectively. The opening position of the connection port of the upper cylinder is higher than the end face of the first flat tube plate 301, and the opening position of the connection port of the lower cylinder is lower than the end face of the second flat tube plate 305. In this embodiment, a magnetic float level gauge 500 is used. In other embodiments of this utility model, the type of level gauge can be reasonably adjusted according to actual needs.

[0056] It should be noted that the connection method between the magnetic level gauge 500 and the cylinder is not specifically described in this utility model. It can be reasonably designed according to actual needs. In this embodiment, it is connected to the cylinder through a flange pipe, and valves are respectively provided between the flange pipe and the cylinder. The valves include a first valve 501 and a second valve 502. A third valve 503 is also provided near the second valve 502 of the magnetic level gauge 500. It is used to connect a sampler to facilitate the sampling and inspection of water in the heat exchange tube 302 in the later stage.

[0057] To ensure adequate gas phase space at the top of the steam generator 100 and prevent overheating and damage to the fins 310 of the heat exchange tube 302, thus reducing thermal efficiency and guaranteeing the heat exchange effect of the heat exchange tube 302, the magnetic level gauge 500 is designed with a minimum safe water level 507, a normal water level 506, and a maximum safe water level 505, with a relative height difference of 50mm. The height of the normal water level 506 is the same as the vertical height of the top fins 310 in the heat exchange tube 302. When the water level in the steam generator 100 is lower than the minimum safe water level 507, the level sensor controls the water pump through the controller to automatically replenish water through the inlet 402, preventing the heat exchange tube 302 from drying out due to lack of water.

[0058] In addition, the main body of the magnetic float level gauge 500 is transparent, and an internal float ball is vertically slidably installed inside to facilitate observation of the liquid level. In this embodiment, the magnetic float level gauge 500 also includes a level sensor, a remote transmitter, and a controller. The level sensor and the remote transmitter are respectively connected to the controller for monitoring and reading the water level inside the heat exchange tube 302. This improves the real-time monitoring and remote indication functions of the equipment, realizes intelligent operation, and saves costs.

[0059] Specifically, the steam generator 100 automatically replenishes water to the heat exchange tube 302 through the magnetic level gauge 500, the external PLC control cabinet, the water pump, the water supply valve, and the water inlet, thereby achieving automatic control.

[0060] The lower end of the magnetic level gauge 500 is connected to a sampler via a ball valve, allowing for water sampling within the equipment. The upper and lower pipes of the magnetic level gauge 500 are connected to the equipment via ball valves. When the heated cooling water in the heat exchange tube 302 needs to be drained or sampled, it can be discharged through the drain port 405.

[0061] The water replenishment zone 400 is located at the lower end of the steam generator 100. The water replenishment zone 400 includes an inlet 402 and a drain port 405. A third flat tube plate 404 is provided at the end of the water replenishment zone 400 away from the heat exchange zone 300, and the drain port 405 is located close to the third flat tube plate 404.

[0062] Please refer to Figure 1 and Figure 6 , Figure 6 The diagram shows the structure of the anti-impact plate from different perspectives, where (a) is the front view and (b) is the top view. The water inlet 402 is located on the side wall of the cylinder. An anti-impact plate 401 is located inside the steam generator 100 near the water inlet 402, positioned opposite to the water inlet 402. In this embodiment, the anti-impact plate 401 is formed by welding two perpendicular, unperforated steel plates together. This arrangement can buffer the impact of water on the equipment during water replenishment.

[0063] Please refer to Figure 1 and Figure 8 , Figure 8 This is a structural schematic diagram of the inlet interface, where (a) is the main view of the inlet and the main view of the sleeve, and (b) is the main view of the sleeve. The inlet interface 410 is also equipped with a sleeve 403 to reduce the impact and thermal stress of the incoming water on the steam generator 100.

[0064] Please refer to Figure 9 The diagram shows the structure of the third flat tube sheet from different perspectives, where (a) is the front view rotated 90° clockwise, and (b) is the top view. The drain port 405 is located at the bottom of the cylinder near the third flat tube sheet 404, which facilitates the drainage or sampling of the heated cooling water.

[0065] A third flat tube plate 404 is provided at one end of the water replenishment zone 400 away from the heat exchange zone 300. The third flat tube plate 404 has an arc-shaped transition edge 321 that is away from the water replenishment zone 400 and serves as the base plate of the steam generator 100. No holes are opened on the plate surface. It can be welded to the cylinder of the water replenishment zone 400 by automatic submerged arc welding, which can reduce or eliminate stress concentration caused by temperature difference at the flat weld and reduce the possibility of leakage.

[0066] It should be noted that in this embodiment, an insulation layer 101 is provided on the outer side of the cylinder in the gas phase zone 200, heat exchange zone 300, and water replenishment zone 400. This can reduce heat loss in the steam generator 100 and improve thermal efficiency. The thickness of the insulation layer 101 can be reasonably set according to actual needs. In this embodiment, the thickness of the insulation layer 101 is 100mm.

[0067] A base is provided on the outer side near the third flat tube plate 404, and no insulation layer 101 is provided at the base.

[0068] It should be noted that the base provides a more stable foundation for the steam generator 100, preventing shaking and vibration during use. Secondly, the base solves the problem of excessively low placement, preventing the equipment from directly contacting the ground, reducing the risk of rust on the bottom metal parts and softening of the plastic parts due to moisture. It also makes the equipment run more smoothly, with less noise and a longer service life. In this embodiment, the base is welded from square steel profiles, which has good weld joint strength and toughness, resulting in high connection strength.

[0069] Please refer to Figures 1-9 The working principle of the steam generator 100 provided in this embodiment is as follows:

[0070] Steam generator 100 collects the heat released from the combustion of waste gas, waste materials, or other combustible substances generated during the enterprise's production process, and then generates steam by exchanging heat with water within the steam generator 100. Specifically, the high-temperature flue gas flowing through the flue inlet 303 and flue outlet 304 of the heat exchange zone 300 exchanges heat with water in the heat exchange tubes 302 of the heat exchange zone 300. The water in the equipment is heated and gradually rises in temperature, eventually reaching its boiling point and turning into steam. The generated steam accumulates in the gas phase zone 200 and is extracted for use through the main steam outlet 104 after reaching a certain pressure. After the steam is continuously extracted, the water level in the steam generator 100 falls below the minimum safe water level 507. The level sensor of the magnetic float level gauge 500 controls the water pump through the controller to automatically replenish water through the water inlet 402, and this operation cycle repeats continuously.

[0071] In summary, the steam generator 100 and steam generation system provided in this embodiment have the following characteristics:

[0072] (1) The equipment adopts a vertical layout, and the heat exchange tube 302 adopts a finned heat exchange tube, which has a good heat exchange effect and higher thermal efficiency.

[0073] (2) Because the equipment is arranged vertically, the size of the flue gas inlet and outlet pipes plus the equipment heat exchange tube 302 is much smaller than that of the horizontal threaded bare tube type waste heat utilization device with the same heat exchange area. Therefore, the flue gas resistance is small, and there is basically no need to increase the power of auxiliary machines such as induced draft fan. In comparison, it is more energy-efficient.

[0074] (3) The equipment adopts a vertical layout, and the equipment is small and lightweight, which makes it easy to inspect and maintain, and reduces manufacturing and production costs.

[0075] (4) The heat exchange tube 302 connecting tube sheet adopts a flanged flat tube sheet with a rounded transition. When welding with the shell, automatic submerged arc welding can be used to reduce labor costs and improve welding quality. The rounded transition can reduce or eliminate stress concentration caused by temperature difference at the flat weld, reducing the possibility of leakage.

[0076] (5) It realizes functions such as automatic water replenishment, safe operation, and reduced maintenance frequency.

[0077] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A steam generator, characterized by, The steam generator includes a vertically distributed gas phase zone, heat exchange zone, and water supply zone, as well as a flat tube sheet disposed between the zones; the flat tube sheet includes a first flat tube sheet and a second flat tube sheet. The gas phase zone is located at the upper end of the steam generator, and the gas phase zone includes a steam-water separation device. The heat exchange zone is located between the gas phase zone and the water replenishment zone. The heat exchange zone includes multiple finned heat exchange tubes and a first flat tube sheet and a second flat tube sheet connected to both ends of the heat exchange tubes. A flue inlet and a flue outlet are provided oppositely on the cylinder of the heat exchange zone. The water replenishment zone is located at the lower end of the steam generator, and the water replenishment zone includes a water inlet. A level gauge is also installed on the outside of the cylinder of the steam generator.

2. The steam generator of claim 1, wherein The steam generator is also equipped with a safety valve port, a temperature measuring port, a pressure measuring port, a main steam outlet, and a manhole on the top cover of the head in the gas phase zone.

3. The steam generator of claim 1, wherein, The steam-water separator has multiple vents for the flow of main steam. The steam-water separator is located directly below the main steam outlet, and no air vents are provided at the location corresponding to the main steam outlet.

4. The steam generator of claim 1, wherein One end of the flat tube sheet has the same diameter as the inner diameter of the steam generator cylinder, and the other end is a transition flange with a rounded arc. The first and second flat tube sheets have arc-shaped over-edges that are positioned opposite each other near the heat exchange zone, and the first and second flat tube sheets have multiple sets of corresponding heat exchange tube openings; the multiple heat exchange tubes are connected to the first and second flat tube sheets respectively through the multiple sets of corresponding heat exchange tube openings. The third flat tube sheet has a rounded transition edge that is located away from the water replenishment area.

5. The steam generator of claim 1, wherein The level gauge includes a level sensor, a remote transmitter, and a controller. The level sensor and the remote transmitter are respectively connected to the controller for monitoring and reading the water level inside the heat exchange tube.

6. The steam generator of claim 5, wherein The level gauge is equipped with a minimum safe water level, a normal water level, and a maximum safe water level with a relative height difference of 50mm. The height of the normal water level is the same as the vertical height of the top fins in the heat exchange tube. When the water level in the steam generator is lower than the minimum safe water level, the level sensor controls the water pump through the controller to automatically replenish water through the inlet.

7. The steam generator of claim 1, wherein The end of the level gauge near the base is connected to a sampler for sampling the water inside the steam generator.

8. The steam generator of claim 1, wherein, The tube sheet also includes a third tube sheet; the third tube sheet is disposed at the end of the water supply area away from the heat exchange area. The third flat tube sheet is also provided with a base at the end away from the water replenishment area, and the base is not provided with an insulation layer; The outer sides of the cylinders in the gas phase zone, heat exchange zone, and water replenishment zone are all provided with insulation layers.

9. The steam generator of claim 1, wherein, An anti-impact plate is provided on the inner side of the steam generator near the water inlet, and a sleeve is also provided at the interface of the water inlet to reduce the impact of the incoming water on the steam generator and the thermal stress.

10. A steam generating system characterized by, It includes a steam generator, thermometer, pressure gauge, safety valve, and feedwater pump as described in any one of claims 1-9.

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