Flow control device for steam generator

Abstract

The utility model discloses a flow control device for steam generator, and steam generator includes preheating system, heat exchange system and flow control device, flow control device includes water inlet component, water outlet component and reflux component, the front end of water inlet component is connected with preheating system, and the tail end is provided with narrow hole and is connected with the liquid inlet end of reflux component, the front end of water outlet component is provided with direct current hole and is connected with the liquid outlet end of reflux component, and the tail end is provided with diffusion hole and is connected with heat exchange system, and the pure water after preheating through preheating system is high -speed spouted from the narrow hole of water inlet component, forms vacuum negative pressure area in the inside of reflux component, and the pure water passes direct current hole, diffusion hole of water outlet component in proper order and enters heat exchange system and carries out heat exchange evaporation, by this, solve cavitation erosion problem, reduce cost, more energy -conserving, and water circulation flow and steam generation efficiency are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology for steam generators, and in particular to a flow control device applied to steam generators. Background Technology

[0002] A gas-fired steam generator is a type of gas-fired steam equipment, typically composed of core components such as a preheating unit, a heat exchanger, and a burner. Its working process is as follows: liquid water first enters the preheating pipeline of the preheating unit for preheating, then is pumped to the heat exchanger, and finally, high-temperature steam is generated under the high temperature of the burner. The resulting dry steam is widely used in various fields such as industry, catering, and textiles.

[0003] Currently, common gas-fired steam generators typically use a water pump to pump preheated pure water through an inlet pipe into a heat exchanger for heating and evaporation. The generated high-temperature steam is then directly delivered to the application end through an exhaust pipe.

[0004] However, the existing technology has the following problems: In the actual operation of the steam generator, since pure water often cannot be completely evaporated, the incompletely vaporized water-containing steam is prone to causing the steam water content to be too high, which affects the user's use and causes great energy waste. In addition, since the evaporator needs to produce steam, the total water flow rate must be equal to the steam output, which places extremely high demands on the evaporator control system, the material and process of the heat exchanger, increasing the daily maintenance cost. In addition, in daily use, it is also easy to cause insufficient water circulation flow in the heat exchanger, which leads to overheating and damage to the pipeline, affecting the steam production efficiency and quality. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a flow control device for steam generators.

[0006] The objective of this utility model is achieved by the following technical solution: a flow control device for a steam generator, wherein the steam generator includes a preheating system, a heat exchange system and the flow control device, and the flow control device includes an inlet component, an outlet component and a return component;

[0007] The front end of the water inlet component is connected to the preheating system, and the rear end is provided with a narrowing hole and connected to the liquid inlet end of the reflux component; the front end of the water outlet component is provided with a direct flow hole and connected to the liquid outlet end of the reflux component, and the rear end is provided with a diffusion hole and connected to the heat exchange system.

[0008] The purified water, preheated by the preheating system, is ejected at high speed from the narrowing hole of the water inlet component, forming a vacuum negative pressure zone inside the reflux component. The purified water then enters the heat exchange system through the direct flow hole and the diffusion hole of the water outlet component for heat exchange and evaporation.

[0009] Furthermore, the direct current hole includes a first direct current hole, which is opposite to and coaxially arranged with the narrowing hole at the end of the water inlet component; the diameter of the first direct current hole is equal to the outlet diameter of the narrowing hole.

[0010] Furthermore, the DC hole includes a second DC hole, which is disposed at the end of the first DC hole and coaxially arranged with the first DC hole; the diameter of the second DC hole is larger than the diameter of the first DC hole; the diffuser hole is disposed at the end of the second DC hole.

[0011] Furthermore, the diffusion hole is disposed at the end of the second DC hole and is arranged coaxially with the second DC hole; the diffusion hole gradually expands outward from the end of the second DC hole, and the angle between the inner wall of the diffusion hole and the axis is 8° to 10°.

[0012] Furthermore, the narrowing hole gradually narrows outward from the inner diameter end of the water inlet component, and the angle between the inner wall of the narrowing hole and the axis is 20° to 30°.

[0013] Furthermore, the steam generator also includes a water vapor separation device, which has a separation chamber connected to the heat exchange system and the return liquid end of the reflux component. The separation chamber is provided with several layers of separation sleeves, which are nested from the inside out or from the outside in. Each layer of separation sleeves has several air guide holes on its wall, and an air guide gap is formed between adjacent layers of separation sleeves. The air guide holes of each layer of separation sleeves are arranged in opposite directions, so that water vapor passes through the air guide holes and surrounds each layer of separation sleeves for water vapor separation.

[0014] Furthermore, the separation chamber is provided with a steam inlet on its side wall, a steam outlet at its upper end, and a liquid return port at its lower end;

[0015] The upper and lower ends of the separation sleeve are each encapsulated with an upper separation end plate and a lower separation end plate. The upper separation end plate has an upper end plate hole, which is coaxially arranged with the steam outlet and the separation sleeve in the center. The lower separation end plate has a lower end plate hole, which is connected to the liquid return port and the gas guide gap.

[0016] The steam inlet is connected to the outermost air guide gap;

[0017] The water-containing steam enters from the steam inlet and undergoes water-vapor separation around each layer of separation sleeve. The separated dry steam is discharged upward from the steam outlet to the application end, while the separated water sinks and is discharged from the return liquid port to the reflux component.

[0018] Furthermore, the heat exchange system is provided with a first heat exchange zone and a second heat exchange zone, the second heat exchange zone is located above the first heat exchange zone and is connected to the first heat exchange zone through a converging water inlet pipe; the first heat exchange zone is connected to a branch water inlet pipe, and the second heat exchange zone is connected to a steam discharge pipe;

[0019] The confluence end of the diverting inlet pipe is connected to the diffuser hole at the end of the outlet component, and the diverting end is connected to the heat exchange pipeline of the first heat exchange zone, so that pure water enters each heat exchange pipeline of the first heat exchange zone through the diverting inlet pipe for heating and evaporation to generate water-containing steam. The water-containing steam enters the second heat exchange zone above through the confluence inlet pipe for secondary heating and evaporation, and then enters the water vapor separation device.

[0020] Furthermore, the heat exchange pipelines in the first heat exchange zone are circular pipes, distributed on both sides of the combustion chamber. The circular pipes on both sides of the combustion chamber are arranged longitudinally in layers and connected end to end.

[0021] Furthermore, the heat exchange pipeline of the second heat exchange zone is a square tube, which is arranged above the first heat exchange zone. The square tubes are arranged side by side in the transverse direction and connected at the head and / or tail. The square tubes are also arranged in layers in the longitudinal direction and connected at the head and / or tail.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] (1) In this embodiment, a flow control device is set between the preheating system and the heat exchange system to replace the traditional water pump's power water circulation mode. The water circulation is non-powered, which can reduce the risk of failure, reduce maintenance costs and energy consumption. The vacuum negative pressure formed by the flow control device can automatically recover the pure water separated in the water vapor separator, ensuring the overall water circulation flow rate and overcoming the cavitation caused by the reduced inlet pressure or excessive water temperature when the water is pumped by the traditional water pump. At the same time, the water circulation flow rate is greatly increased. Without increasing the total water volume, the water flow rate is increased from the traditional 4L / minute to 7-10L / minute, which effectively prevents the pipeline from overheating and being damaged. The overall steam generation efficiency is more than twice that of the traditional method.

[0024] (2) By setting up a water-vapor separation device to recover moisture from the steam, and at the same time cooperating with the pure water recovery and replenishment of the flow control device, steam waste is reduced, so as to further avoid insufficient water circulation and improve the steam dryness (up to 99% or more), improve the steam quality, and ensure the long-term stable operation of the system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the connection between the water vapor separation device and the flow control device of the high-efficiency steam generator in a preferred embodiment of the present invention, and a partially cut-out structural diagram.

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a plan sectional view of the flow control device in a preferred embodiment of the present invention;

[0028] Figure 4 This is a longitudinal sectional view of the water-vapor separation device of the high-efficiency steam generator in a preferred embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional view of the water-vapor separation device of the high-efficiency steam generator in a preferred embodiment of the present invention;

[0030] Figure 6 This is a three-dimensional schematic diagram showing the internal structure of a high-efficiency steam generator with its outer casing removed, as described in an embodiment of the present invention.

[0031] In the picture:

[0032] 10. Preheating system; 101. Preheating outlet pipe;

[0033] 20. Heat exchange system; 201. First heat exchange zone; 202. Heat exchange inlet pipe; 203. Diversion inlet pipe; 204. Second heat exchange zone; 205. Steam exhaust pipe; 206. Merging inlet pipe;

[0034] 30. Flow control device; 301. Water inlet component; 3011. Constriction orifice; 302. Water outlet component; 3021. First direct flow orifice; 3022. Second direct flow orifice; 3023. Diffuser orifice; 303. Reflux component; 3031. Liquid inlet end; 3032. Liquid outlet end; 3033. Liquid return end; 3034. Vacuum negative pressure zone;

[0035] 40. Water-vapor separation device; 401. Separation chamber; 4011. Steam inlet; 4012. Steam outlet; 4013. Return pipe; 402. Separation sleeve; 4021. Air guide hole; 4022. Air guide gap; 403. Upper separation end plate; 4031. Upper end plate hole; 404. Lower separation end plate; 4041. Lower end plate hole. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] like Figure 1-6As shown, a flow control device 30 is applied to a steam generator. The dry steam generated by the steam generator in this embodiment is widely used in various fields such as industry, catering, and textiles. The steam generator includes a preheating system 10, a heat exchange system 20 (heat exchanger section), a water-vapor separation device 40, and the flow control device 30. The preheating system 10 is equipped with multi-layer square preheating pipelines. A preheating water inlet pipe is installed at the inlet of the preheating pipelines to connect to an external pure water source (such as a water softening device). Preheating is mainly achieved through preheating recovery methods (such as high-temperature exhaust gas generated from combustion) to a set water temperature (e.g., 80℃~90℃) to reduce energy consumption in subsequent heat exchange. A preheating water outlet pipe 101 is installed at the outlet of the preheating pipelines. This preheating water outlet pipe 101 is made of high-temperature resistant metal pipe (such as stainless steel pipe) and delivers the preheated pure water to the flow control device 30.

[0038] The heat exchange system 20 is divided into a combustion chamber and a heat exchange zone. The combustion chamber is equipped with a burner, electric heating elements, and other high-temperature heating systems. The heat exchange zone typically consists of multiple sets of heat exchange tubes arranged around the combustion chamber (e.g., above and / or on the left and right sides of the combustion chamber). The upper part of the heat exchange zone is connected to a steam exhaust pipe 205 for outputting wet steam; the lower part is connected to a heat exchange water inlet pipe 202 for receiving water from the flow control device 30. The heat exchange system 20 heats and evaporates the water in the pipes using a flame or high-temperature flue gas to generate steam.

[0039] The flow control device 30 includes an inlet component 301, an outlet component 302, and a return component 303. The inlet component 301 is connected to the preheated outlet pipe 101 via a thread or flange at its front end, and has a narrowing orifice 3011 (like a Venturi tube structure) at its rear end. The outlet component 302 has a direct flow orifice at its front end and a diffuser orifice 3023 at its rear end, and is connected to the heat exchange inlet pipe 202 via a pipe. The return component 303 is a T-shaped connecting cavity, with its inlet end 3031 connected to the outlet of the narrowing orifice 3011 of the inlet component 301, its outlet end 3032 connected to the inlet of the direct flow orifice of the outlet component 302, and its return end 3033 connected to the return pipe 4013 of the water-vapor separator 40 via a pipe. The angles of the narrowing orifice 3011 and the diffuser orifice 3023 are adjustable to accommodate different flow requirements. This completes the structural connection and basic design between the preheating system 10, the heat exchange system 20, the water vapor separation device 40, and the flow control device 30.

[0040] Based on the Venturi effect, when preheated pure water is ejected from the narrowing orifice 3011 of the inlet component 301 at a certain speed (flow velocity up to 1200 m / s), the increased flow velocity and decreased pressure create a vacuum negative pressure zone 3034 inside the return component 303. This negative pressure draws in the return liquid from the water vapor separator 40. When the high-speed ejected pure water passes through the direct flow orifice and the diffuser orifice 3023, the diffuser orifice 3023 is designed to restore pressure, reduce energy loss, and ensure stable water entry into the heat exchange system 20.

[0041] Therefore, by setting a flow control device 30 between the preheating system 10 and the heat exchange system 20, replacing the traditional power water circulation mode of the water pump, the water circulation operation is carried out without power. This not only reduces the risk of failure, maintenance costs, and energy consumption, but also automatically recovers the pure water separated in the water vapor separator 40 through the vacuum negative pressure formed by the flow control device 30, ensuring the overall water circulation flow rate and overcoming the cavitation caused by the decrease in inlet pressure or excessive water temperature when the water is pumped for circulation using a traditional water pump. At the same time, the water circulation flow rate is greatly increased. Without increasing the total water volume, the water flow rate is increased from the traditional 4L / minute to 7-10L / minute, effectively preventing pipeline overheating damage. The overall steam generation efficiency is more than twice that of the traditional method.

[0042] The water-vapor separator 40 includes a separation chamber 401, typically a vertical cylindrical container. The sidewall of the separation chamber 401 is connected to the steam discharge pipe 205. The upper part of the separation chamber 401 discharges dry steam, and the lower part is connected to the return end 3033 of the return component 303 via a return pipe 4013. The separation chamber 401 contains a separation structure that uses gravity or centrifugal force to separate the wet steam evaporated from the heat exchange system 20. Dry steam, due to its lower density, rises and discharges, while water, due to its higher density, sinks. Under the vacuum negative pressure of the flow control device 30, water is drawn into the return component 303 and re-enters the heat exchange system 20. If necessary, a liquid level sensor or an automatic drain valve can be added to the separation chamber 401 to control the amount of return liquid.

[0043] In this way, by setting up a water-vapor separator 40 to recover moisture from the steam, and at the same time cooperating with the pure water recovery and replenishment of the flow control device 30, steam waste is reduced, which further avoids insufficient water circulation and improves the steam dryness (up to 99% or more), thereby improving the steam quality and ensuring the long-term stable operation of the system.

[0044] Regarding further optimization of the DC hole structure, the DC hole includes a first DC hole 3021 and a second DC hole 3022, both machined inside the water outlet component 302. The first DC hole 3021 is opposite to and coaxially arranged with the narrowing hole 3011 at the end of the water inlet component 301, and the outlet diameter of the narrowest end of the narrowing hole 3011 is equal to the diameter of the first DC hole 3021 (e.g., 5mm), ensuring a smooth transition of water ejected from the water inlet component 301 between the narrowing hole 3011 and the first DC hole 3021.

[0045] The second DC hole 3022 is located at the end of the first DC hole 3021, arranged coaxially, and its diameter is larger than that of the first DC hole 3021 (e.g., 9 mm). The diffuser hole 3023 is located at the end of the second DC hole 3022, and the diameter of the diffuser hole 3023 gradually increases outward from the end of the second DC hole 3022.

[0046] Therefore, in this embodiment, the first direct-flow orifice 3021 of the outlet component 302 is used to maintain high-speed water flow, and the second direct-flow orifice 3022 is used for initial diffusion to reduce turbulence and prepare for the diffuser orifice 3023. This stepped design reduces pressure fluctuations, improves flow control accuracy, avoids water hammer, and further enhances system stability. In practical applications, the number of direct-flow orifices in the outlet component 302 can be increased to multiple stages, with the orifice diameter increasing progressively to optimize the inlet flow field of the heat exchange system 20.

[0047] Further optimizations to the narrowing orifice 3011 and the diffuser orifice 3023 are made as follows: the narrowing orifice 3011 gradually narrows outward from the inner diameter end of the water inlet component 301 (e.g., a tapered constriction), with an angle of 20° to 30° between the inner wall and the axis, and a diameter of 0.8-5mm. This optimized smaller angle (compared to a traditional Venturi tube) combined with water flow characteristics accelerates water flow, enhances the negative pressure effect, strengthens vacuum negative pressure, more effectively recovers water, prevents cavitation, and improves backflow efficiency. In practical applications, the narrowing orifice 3011 can also be made of wear-resistant ceramic to extend its service life.

[0048] The diffuser hole 3023 and the second direct current hole 3022 are arranged coaxially. The diffuser hole 3023 gradually expands outward from the end of the second direct current hole 3022 (like a tapered flare). The angle between the inner wall of the diffuser hole and the axis is 8° to 10°, and the diameter is 3-10 mm. This angle is determined through fluid simulation optimization. The diffuser hole 3023 converts kinetic energy into pressure energy through its gradually expanding shape, restoring the water flow pressure, reducing the resistance entering the heat exchange system 20, thereby reducing energy loss, increasing the heat exchange inlet water pressure, and ensuring uniform evaporation. In practical applications, the inner wall of the diffuser hole 3023 can be processed into a spiral shape to promote mixing.

[0049] The structure of the separation sleeve 402 in the water-vapor separator 40 is further optimized. Several layers of separation sleeves 402 (e.g., 4 layers) are arranged inside the separation chamber 401. The number of sleeve layers can be adjusted according to the steam flow rate, and they are arranged layer by layer from the inside to the outside. Each sleeve is cylindrical, and multiple air guide holes 4021 (diameter 2mm to 5mm) are opened on the tube wall. The air guide holes 4021 are arranged along the axial direction of the separation sleeve 402. The air guide holes 4021 can be rectangular holes extending along the axial direction of the sleeve, or they can be designed as louvers.

[0050] When installing the separation sleeve 402, the sleeve is set according to the diameter of each sleeve, so that an air guide gap 4022 (width 5mm to 10mm) is reserved between adjacent sleeves.

[0051] Furthermore, by reversing the arrangement of the vent holes 4021 in each layer of the casing (e.g., the inner layer holes to the left, the middle layer holes to the right, and the outer layer holes to the left), the steam path is made to be circular and tortuous.

[0052] Therefore, by optimizing the design of the tube layer, air guide gap 4022 and air guide hole 4021 of the separation sleeve 402, the wet steam from the heat exchange system 20 enters the separation sleeve 402 and changes direction multiple times along the path of the air guide gap 4022 and through the reverse air guide hole 4021. The water condenses and sinks due to inertial impact on the tube wall, reducing water entrainment, improving water vapor separation efficiency, and further improving steam dryness.

[0053] The interface of the separation chamber 401 and the encapsulation of the separation sleeve 402 are further defined. The side wall of the separation chamber 401 is provided with a steam inlet 4011, the steam outlet 4012 is connected to the steam discharge pipe 205, the upper end is provided with a steam outlet 4012, the steam outlet 4012 is connected to the application end, and the lower end is provided with a return pipe 4013, the return pipe 4013 is connected to the return end 3033 of the return component 303.

[0054] The upper and lower end caps of the separating sleeve 402 are provided with an upper separating end plate 403 and a lower separating end plate 404. An upper end plate hole 4031 is opened in the middle of the upper end plate, and the upper end plate hole 4031 is coaxial with the steam outlet 4012 and the central sleeve; the lower end plate has a lower end plate hole 4041, which communicates with the return liquid pipe 4013 and the gas guide gap 4022. The upper and lower end plates can be designed to be detachable for easy cleaning.

[0055] Steam inlet 4011 is connected to the outermost air guide gap 4022 of separation sleeve 402. Wet steam generated by the evaporation of heat exchange system 20 enters the separation chamber 401 from the side, spirals upward along the air guide gap 4022 of separation sleeve 402, and separates layer by layer through air guide holes 4021. Dry steam is discharged from the top, while moisture adheres to the outer wall of the sleeve and sinks, then flows back to the return component 303 through the bottom end plate hole 4041 and return liquid pipe 4013. Therefore, by optimizing the flow path of the water vapor separation device 40 and reducing pressure loss, continuous separation and return of wet steam are achieved.

[0056] In this embodiment, the heat exchange system 20 has a layered design, including a first heat exchange zone 201 and a second heat exchange zone 204. The second heat exchange zone 204 is located above the first heat exchange zone 201. Both zones are provided with several layers of heat exchange tubes. The uppermost layer of the first heat exchange zone 201 and the lowermost layer of the second heat exchange zone 204 are connected by a converging water inlet pipe 206.

[0057] The first heat exchange zone 201 is connected to the branch inlet pipe 203. The confluence end of the branch inlet pipe is connected to the diffuser hole 3023 of the outlet component 302. At least two pipes branch off from the branch end of the branch inlet pipe 203 and connect to the lowest heat exchange tube of the first heat exchange zone 201. The branch inlet pipe 203 evenly distributes water to the multiple heat exchange tubes of the first heat exchange zone 201, further improving the heat exchange efficiency.

[0058] The first heat exchange zone 201 performs initial evaporation to generate wet steam. The second heat exchange zone 204 performs secondary heating to increase the dryness of the steam. The uppermost heat exchange tube of the second heat exchange zone 204 is connected to the steam discharge pipe 205. The steam obtained from further heating and evaporation is then transported from the steam discharge pipe 205 to the water-vapor separator 40.

[0059] Therefore, by extending the heat exchange path through the partitioned and layered design of the heat exchange system 20, multi-stage evaporation is formed, which improves evaporation efficiency, avoids local overheating, and ensures steam quality.

[0060] Regarding the design of the heat exchange tube shapes in each of the 20 zones of the heat exchange system, the heat exchange tubes in the first heat exchange zone 201 are circular tubes, arranged in layers on both sides of the combustion chamber (e.g., 6 layers), with the combustion system located in the center of the combustion chamber. The heat exchange tubes in the second heat exchange zone 204 are square tubes, arranged in layers above the first heat exchange zone 201 (e.g., 6 layers). Whether circular or square tubes, the pipes can be coated with an anti-corrosion coating to improve the service life of the heat exchange pipes.

[0061] In this embodiment, the heat exchange system 20 uses round tubes for its high pressure resistance, making it suitable for high-temperature zones, as the combustion temperature and water pressure in the first heat exchange zone 201 are relatively high. The second heat exchange tube uses square tubes for its large heat exchange area, making it suitable for low-temperature steam zones. This optimizes heat distribution, improves thermal efficiency, and extends equipment lifespan.

[0062] The working steps of the high-efficiency steam generation method of the steam generator in this embodiment are as follows:

[0063] S1. Preheating stage: External purified water enters the preheating system 10 and is heated to the set water temperature (e.g., 80℃~90℃) by the preheating system 10. The preheating system 10 can be integrated with a temperature controller to ensure stable water temperature.

[0064] S2. In the heat exchange stage, preheated water flows out from the preheated water outlet pipe 101 and is transported to the flow control device 30. It is then sprayed out through the narrowing orifice 3011 of the water inlet component 301 (flow velocity up to 110 m / s), creating a vacuum negative pressure within the return component 303. Water sequentially passes through the direct flow orifice, diffuser orifice 3023, and heat exchange inlet pipe 202, entering the first heat exchange zone 201 of the heat exchange system 20. It is heated by the high-temperature flue gas (1100°C to 1300°C) generated by the burner in the combustion chamber to produce wet steam. The wet steam enters the second heat exchange zone 204 through the converging inlet pipe 206 for secondary heating and evaporation, resulting in relatively low-humidity wet steam. Automatic reflux is achieved through the Venturi effect, eliminating the need for an additional water pump, saving energy and reducing consumption, and preventing cavitation.

[0065] S3, the water-vapor separation stage: wet steam enters the water-vapor separation device 40 through the steam discharge pipe 205. The separated dry steam is discharged to the application end, while the separated water settles and is drawn back to the return component 303 by the vacuum negative pressure, re-entering the heat exchange system 20 to participate in heating and evaporation. This achieves water recycling, improves water circulation efficiency, and increases steam dryness.

[0066] The water vapor separation process is further defined as follows: Multiple layers of separation sleeves 402 are installed within the separation chamber 401 of the water vapor separation device 40, with each layer having air guide holes 4021 arranged in reverse order. Wet steam enters the separation sleeves 402 and flows in a circular pattern along the air guide gaps 4022 and through the air guide holes 4021. Moisture impacts the pipe walls and sinks, while dry steam is discharged from the steam outlet 4012. The sinking water is drawn back to the return component 303 under vacuum negative pressure, mixes with the newly added preheated water, and re-enters the heat exchange system 20. Through a combination of inertial separation and condensation, deep water vapor separation is achieved, resulting in more thorough separation.

[0067] Through the optimized design of the above-mentioned high-efficiency steam generation method, the water circulation balance is automatically maintained during the pure water heat exchange evaporation process, the water flow rate of the main heat exchanger is increased by 50% to 150%, the heat exchanger is protected from being burned out, and the high-temperature separated water can be used directly without additional power. The high-temperature separated water is turned into steam with very little energy, and the steam dryness is kept above 99%, realizing a more efficient and energy-saving heat exchange steam working mode, and extending the service life of the steam generator by more than double.

[0068] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A flow control device for use in a steam generator, characterized in that, The steam generator includes a preheating system, a heat exchange system, and the flow control device, which includes an inlet component, an outlet component, and a return component. The front end of the water inlet component is connected to the preheating system, and the rear end is provided with a narrowing hole and connected to the liquid inlet end of the reflux component; the front end of the water outlet component is provided with a direct flow hole and connected to the liquid outlet end of the reflux component, and the rear end is provided with a diffusion hole and connected to the heat exchange system. The purified water, preheated by the preheating system, is ejected at high speed from the narrowing hole of the water inlet component, forming a vacuum negative pressure zone inside the reflux component. The purified water then enters the heat exchange system through the direct flow hole and the diffusion hole of the water outlet component for heat exchange and evaporation.

2. The flow control device for a steam generator as described in claim 1, characterized in that, The direct current hole includes a first direct current hole, which is opposite to and coaxially arranged with the narrowing hole at the end of the water inlet component; the diameter of the first direct current hole is equal to the outlet diameter of the narrowing hole.

3. The flow control device for a steam generator as described in claim 2, characterized in that, The DC hole includes a second DC hole, which is disposed at the end of the first DC hole and is arranged coaxially with the first DC hole; the diameter of the second DC hole is larger than the diameter of the first DC hole; the diffuser hole is disposed at the end of the second DC hole.

4. The flow control device for a steam generator as described in claim 3, characterized in that, The diffusion hole is located at the end of the second DC hole and is arranged coaxially with the second DC hole; the diffusion hole gradually expands outward from the end of the second DC hole, and the angle between the inner wall of the diffusion hole and the axis is 8° to 10°.

5. The flow control device for a steam generator as described in claim 1, characterized in that, The narrowing hole gradually narrows outward from the inner diameter end of the water inlet component, and the angle between the inner wall of the narrowing hole and the axis is 20° to 30°.

6. The flow control device for a steam generator as described in any one of claims 1-5, characterized in that, The steam generator also includes a water vapor separation device, which has a separation chamber connected to the heat exchange system and the return liquid end of the reflux component. The separation chamber is provided with several layers of separation sleeves, which are nested from the inside out or from the outside in. Each layer of separation sleeves has several air guide holes on its wall, and an air guide gap is formed between adjacent layers of separation sleeves. The air guide holes of each layer of separation sleeves are arranged in opposite directions, so that water vapor passes through the air guide holes and surrounds each layer of separation sleeves for water vapor separation.

7. The flow control device for a steam generator as described in claim 6, characterized in that, The separation chamber is provided with a steam inlet on the side wall, a steam outlet at the upper end, and a liquid return port at the lower end; The upper and lower ends of the separation sleeve are each encapsulated with an upper separation end plate and a lower separation end plate. The upper separation end plate has an upper end plate hole, which is coaxially arranged with the steam outlet and the separation sleeve in the center. The lower separation end plate has a lower end plate hole, which is connected to the liquid return port and the gas guide gap. The steam inlet is connected to the outermost air guide gap; The water-containing steam enters from the steam inlet and undergoes water-vapor separation around each layer of separation sleeve. The separated dry steam is discharged upward from the steam outlet to the application end, while the separated water sinks and is discharged from the return liquid port to the reflux component.

8. The flow control device for a steam generator as described in claim 6, characterized in that, The heat exchange system is provided with a first heat exchange zone and a second heat exchange zone. The second heat exchange zone is located above the first heat exchange zone and is connected to the first heat exchange zone through a converging water inlet pipe. The first heat exchange zone is connected to a branch water inlet pipe, and the second heat exchange zone is connected to a steam exhaust pipe. The confluence end of the diverting inlet pipe is connected to the diffuser hole at the end of the outlet component, and the diverting end is connected to the heat exchange pipeline of the first heat exchange zone, so that pure water enters each heat exchange pipeline of the first heat exchange zone through the diverting inlet pipe for heating and evaporation to generate water-containing steam. The water-containing steam enters the second heat exchange zone above through the confluence inlet pipe for secondary heating and evaporation, and then enters the water vapor separation device.

9. The flow control device for a steam generator as described in claim 8, characterized in that, The heat exchange pipelines in the first heat exchange zone are circular pipes, which are distributed on both sides of the combustion chamber. The circular pipes on both sides of the combustion chamber are arranged longitudinally in layers and connected end to end.

10. The flow control device for a steam generator as described in claim 8, characterized in that, The heat exchange pipelines of the second heat exchange zone are square tubes and are arranged above the first heat exchange zone. The square tubes are arranged side by side in the horizontal direction and connected at the head and / or tail. The square tubes are also arranged in layers in the longitudinal direction and connected at the head and / or tail.

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