Efficient steam generator and efficient steam generation method thereof

Abstract

The invention discloses an efficient steam generator and an efficient steam generation method thereof. The efficient steam generator comprises a preheating system, a heat exchange system, a flow control device and a water vapor separation device. The front end of a water inlet component of the flow control device is connected with a preheating water outlet pipe, and the tail end is provided with a narrowing hole and connected with the liquid inlet end of a backflow component; the front end of the water outlet component is provided with a direct flow hole and connected with the liquid outlet end of the backflow component, and the tail end is provided with a diffusion hole and connected with the heat exchange water inlet pipe. The preheated purified water is sprayed out from a narrowing hole of the water inlet component, a vacuum negative pressure area is formed in the backflow component, and the sprayed purified water enters the heat exchange system to be subjected to heat exchange evaporation; a separation cavity of the water-steam separation device is connected with a steam discharge pipe and the liquid return end of the backflow component, separated dry steam is directly discharged to the application end, and separated water sinks and is sucked into the backflow component to be subjected to heat exchange and evaporation again. Therefore, cost is reduced, energy is saved, and water circulation flow, steam generation efficiency and steam dryness are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology for steam generators, and more particularly to a high-efficiency steam generator and a method for generating steam efficiently. 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, pure water often cannot be completely evaporated, and the incompletely vaporized water-containing steam easily leads to excessively high steam moisture content, affecting user use and causing a great deal of energy waste. Furthermore, because the evaporator needs to produce steam, the total inlet water flow rate must be equal to the steam output, placing extremely high demands on the evaporator's control system, the materials and processes of the heat exchanger. This can even cause insufficient water circulation flow in the heat exchanger, leading to overheating and damage to the pipelines, affecting steam production efficiency and quality. In addition, the steam output from the heat exchanger outlet has excessively high moisture content, affecting the quality of the high-temperature steam and requiring further water-liquid separation. Existing water-vapor separation devices are inefficient, and there is an urgent need to find a more effective water-liquid separation method. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a high-efficiency steam generator.

[0006] One of the objectives of this invention is achieved by the following technical solution: a high-efficiency steam generator, comprising a preheating system, a heat exchange system, a flow control device, and a water-steam separator;

[0007] The preheating system is connected to a preheated water outlet pipe;

[0008] The heat exchange system has a heat exchange zone, with a steam discharge pipe connected to the upper part of the heat exchange zone and a heat exchange water inlet pipe connected to the lower part.

[0009] The flow control device comprises a water inlet component, a water outlet component and a backflow component; the front end of the water inlet component is connected with the preheating water outlet pipe, the narrow hole is arranged at the end of the water inlet component and is connected with the liquid inlet end of the backflow component; the front end of the water outlet component is provided with the straight flow hole and is connected with the liquid outlet end of the backflow component, the diffusion hole is arranged at the end of the water outlet component and is connected with the heat exchange water inlet pipe;

[0010] The pure water preheated by the preheating system is sprayed from the narrow hole of the water inlet component to form a vacuum negative pressure area in the backflow component, and the pure water sequentially passes through the straight flow hole, the diffusion hole of the water outlet component and the heat exchange water inlet pipe to enter the heat exchange system for heat exchange and evaporation.

[0011] The water vapor separation device is provided with a separation cavity, the separation cavity is connected with the steam discharge pipe and the liquid return end of the backflow component, the dry steam separated by the water vapor separation device is directly discharged to the application end, the separated water sinks and is sucked into the backflow component under the action of the vacuum negative pressure and reenters the heat exchange system for heat exchange and evaporation.

[0012] Further, the straight flow hole comprises a first straight flow hole and a second straight flow hole, the first straight flow hole is arranged opposite to and coaxial with the narrow hole at the end of the water inlet component; the diameter of the first straight flow hole is equal to the outlet diameter of the narrow hole; the second straight flow hole is arranged at the end of the first straight flow hole and coaxial with the first straight flow hole, and the diameter of the second straight flow hole is greater than that of the first straight flow hole; the diffusion hole is arranged at the end of the second straight flow hole.

[0013] Further, the diffusion hole is arranged at the end of the second straight flow hole and coaxial with the second straight flow hole; the diffusion hole gradually expands outward from the end of the second straight flow hole, and the included angle between the inner hole wall of the diffusion hole and the axis is 8° to 10°.

[0014] Further, the narrow hole gradually narrows outward from the end of the inner diameter of the water inlet component, and the included angle between the inner hole wall of the narrow hole and the axis is 20° to 30°.

[0015] Further, a plurality of layers of separation sleeve pipes are arranged in the separation cavity, the plurality of layers of separation sleeve pipes are arranged in layers from inside to outside; a plurality of air guide holes are arranged on the pipe wall of each layer of separation sleeve pipes, an air guide gap is formed between the adjacent two layers of separation sleeve pipes, and the air guide holes arranged in each layer of separation sleeve pipes are reversely arranged, so that the wet steam passes through the air guide holes and surrounds each layer of separation sleeve pipes for water vapor separation.

[0016] Further, the side wall of the separation cavity is provided with a steam inlet, the upper end is provided with a steam outlet, and the lower end is provided with a liquid return pipe.

[0017] The upper and lower ends of the separation sleeve are respectively covered with an upper separation end plate and a lower separation end plate, the upper separation end plate is provided with an upper end plate hole coaxial with the steam outlet and the separation sleeve of the central part, and the lower separation end plate is provided with a lower end plate hole in communication with the liquid return pipe and the air guide gap;

[0018] The steam inlet is in communication with the outermost air guide gap;

[0019] The wet steam enters the steam inlet and is subjected to water vapor separation around each layer of separation sleeve, the separated dry steam is discharged upward from the steam outlet to the application end, and the separated water sinks and is discharged from the liquid return pipe to the return component.

[0020] Further, the heat exchange zone comprises a first heat exchange zone and a second heat exchange zone, the second heat exchange zone is arranged above the first heat exchange zone and is in communication with the first heat exchange zone through a converging water inlet pipe, the first heat exchange zone is connected with a shunt water inlet pipe, and the second heat exchange zone is connected with the steam discharge pipe;

[0021] The converging end of the shunt water inlet pipe is connected with the diffusion hole at the end of the water outlet component, and the shunt end is connected with the heat exchange pipe of the first heat exchange zone, so that the pure water enters each heat exchange pipe of the first heat exchange zone through the shunt water inlet pipe to generate wet steam by heating and evaporation, the wet steam enters the second heat exchange zone above for secondary heating and evaporation, and then enters the water vapor separation device.

[0022] Further, the heat exchange pipe of the first heat exchange zone is a circular pipe and is arranged in layers on both sides of the combustion chamber, and the heat exchange pipe of the second heat exchange zone is a square pipe and is arranged in layers above the first heat exchange zone.

[0023] Compared with the prior art, the high-efficiency steam generator has the following advantages:

[0024] (1) In the embodiment, a flow control device is arranged between the preheating system and the heat exchange system to replace the power water circulation mode of the traditional water pump, so that the water circulation is performed without power, the failure risk and maintenance cost are reduced, the energy consumption is saved, the separated pure water in the water vapor separation device is automatically recovered through the vacuum negative pressure formed by the flow control device, the overall water circulation flow is ensured, the cavitation caused by the decrease of the inlet pressure or the excessively high water temperature during the water circulation by the traditional water pump is overcome, the water circulation flow is greatly improved, the water flow is increased from 4 L / min in the traditional mode to 7-10 L / min without increasing the total water flow, the overheating damage of the pipeline is effectively prevented, and the steam generation efficiency is more than doubled compared with the traditional mode;

[0025] And by setting up water vapor separation device recovers water in steam, while coordinating flow control device pure water recycling and replenishment, reduce steam waste, to further avoid water circulation shortage, and improve steam dryness (up to 99 %), improve steam quality, ensure long-term stable operation of system.

[0026] (2) The first straight hole of the water outlet part is used for maintaining high speed of water flow, and the second straight hole is used for preliminarily expanding pressure and reducing turbulence, so as to prepare for the diffusion hole. The ladder type design reduces pressure fluctuation, improves flow control precision, avoids water hammer phenomenon, and further enhances system stability.

[0027] (3) Through the optimization design of the pipe layer, the air guide gap and the air guide hole structure of the separation sleeve, when the wet steam of the heat exchange system enters the separation sleeve, the wet steam changes direction multiple times along the air guide gap path and through the reverse air guide hole, the water is condensed and settled due to inertia impact on the pipe wall, the water entrainment is reduced, the water vapor separation efficiency is improved, and the steam dryness is further improved.

[0028] In order to overcome the shortcomings of the prior art, the second purpose of the present application is to provide a steam efficient generation method.

[0029] The second purpose of the present application is realized by adopting the following technical scheme: a steam efficient generation method, comprising a preheating system, a heat exchange system, a flow control device and a water vapor separation device, the flow control device comprising a water inlet part, a water outlet part and a backflow part, the method comprising the following steps:

[0030] S1, in the preheating stage, the pure water is preheated to a set water temperature through the preheating system;

[0031] S2, in the heat exchange stage, the preheated water flows out from the preheating water outlet pipe, is high-speed injected through the narrowing hole of the water inlet part, a vacuum negative pressure area is formed in the backflow part, and the pure water enters the heat exchange system through the straight hole, the diffusion hole and the heat exchange water inlet pipe of the water outlet part in sequence to exchange heat and evaporate;

[0032] S3, in the water vapor separation stage, the wet steam obtained through the heat exchange of the heat exchange system enters the water vapor separation device for water vapor separation, the dry steam is discharged upward to an application end, and the separated water is sucked back to the backflow part by the vacuum negative pressure to participate in evaporation again.

[0033] Further, in the water vapor separation step, a plurality of separation sleeve pipes are arranged in the separation cavity of the water vapor separation device, air guide holes are arranged on the pipe wall of each separation sleeve pipe, air guide gaps are formed between adjacent separation sleeve pipes, and the air guide holes of each separation sleeve pipe are reversely arranged; the wet steam flows around and collides when entering the air guide gap and passing through the air guide hole, so as to perform deep water vapor separation.

[0034] Compared with the prior art, the beneficial effects of the steam efficient generation method of the embodiment are that: through the optimized design of the steam efficient generation method, the water circulation balance is automatically maintained in the pure water heat exchange evaporation process, the water flow of the main heat exchanger is increased by 50%-150%, the heat exchanger is protected from being burned out, the high-temperature separated water is directly used without additional power, the high-temperature separated water is changed into steam with very little energy and the steam dryness is maintained above 99%, a more efficient energy-saving heat exchange steam working mode is realized, and the service life of the steam generator is doubled. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a three-dimensional schematic view of the internal structure of the high-efficiency steam generator in the embodiment of the application, which is disassembled from the shell.

[0036] Figure 2 It is a structure schematic view of the water vapor separation device and the flow control device of the high-efficiency steam generator in the preferred embodiment of the application, and a partial cross-sectional view.

[0037] Figure 3 It is a three-dimensional schematic view of the internal structure of the high-efficiency steam generator in the embodiment of the application, which is disassembled from the shell. Figure 2 It is an enlarged schematic view of position A in the embodiment.

[0038] Figure 4 It is a plan cross-sectional view of the flow control device in the preferred embodiment of the application.

[0039] Figure 5 It is a three-dimensional schematic view of the water vapor separation device of the high-efficiency steam generator in the preferred embodiment of the application.

[0040] Figure 6 It is a longitudinal cross-sectional view of the water vapor separation device of the high-efficiency steam generator in the preferred embodiment of the application.

[0041] Figure 7 It is a transverse cross-sectional view of the water vapor separation device of the high-efficiency steam generator in the preferred embodiment of the application.

[0042] Figure 8 It is a three-dimensional schematic view of the high-efficiency steam generator in the preferred embodiment of the application.

[0043] In the figure:

[0044] 10, preheating system; 101, preheating water outlet pipe;

[0045] 20, heat exchange system; 201, first heat exchange area; 202, heat exchange water inlet pipe; 203, shunt water inlet pipe; 204, second heat exchange area; 205, steam discharge pipe; 206, combined water inlet pipe;

[0046] 30, flow control device; 301, water inlet component; 3011, narrowing hole; 302, water outlet component; 3021, first straight hole; 3022, second straight hole; 3023, diffusion hole; 303, backflow component; 3031, liquid inlet end; 3032, liquid outlet end; 3033, liquid return end; 3034, vacuum negative pressure area;

[0047] 40, water vapor separation device; 401, separation cavity; 4011, steam inlet; 4012, steam outlet; 4013, liquid 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 DESCRIPTION

[0048] Hereinafter, the present application will be further described in conjunction with the drawings and specific embodiments, and it should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments without conflict.

[0049] As shown in Figures 1-8 An efficient steam generator for generating high-quality dry steam is widely used in various fields such as industry, catering, and textile. The efficient steam generator includes a preheating system 10, a heat exchange system 20 (heat exchanger part), a flow control device 30, and a water vapor separation device 40. The preheating system 10 is provided with multiple layers of square preheating pipelines, and the inlet of the preheating pipeline is provided with a preheating water inlet pipe for connecting an external pure water source (such as a softened water device). The preheating pipeline is mainly preheated to a set water temperature (such as 80-90°C) by a preheating recovery method (such as high-temperature residual smoke generated by combustion) to reduce the energy consumption of subsequent heat exchange. The preheating pipeline outlet is provided with a preheating water outlet pipe 101 made of high-temperature resistant metal pipe (such as stainless steel pipe) to deliver the preheated pure water to the flow control device 30.

[0050] The heat exchange system 20 is divided into a combustion chamber and a heat exchange area, and the combustion chamber is installed with a burner, an electric heating element, etc. to generate a high-temperature heating system. The heat exchange area is usually composed of multiple groups of heat exchange pipelines and arranged around the combustion chamber (such as arranged above and / or on the left and right sides of the combustion chamber). The upper part of the heat exchange area is connected with a steam discharge pipe 205 for outputting wet steam, and the lower part is connected with 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 pipeline by flame or high-temperature flue gas to generate steam.

[0051] The flow control device 30 comprises a water inlet component 301, a water outlet component 302 and a backflow component 303. The front end of the water inlet component 301 is connected to the preheating water outlet pipe 101 by threads or flanges, and the end is processed with a narrowed hole 3011 (such as a venturi structure). The front end of the water outlet component 302 is provided with a straight flow hole, and the end is provided with a diffusion hole 3023, and is connected to the heat exchange water inlet pipe 202 by a pipe. The backflow component 303 is a T-shaped connecting cavity, the inlet end 3031 of which is connected to the outlet of the narrowed hole 3011 of the water inlet component 301, the outlet end 3032 is connected to the inlet of the straight flow hole of the water outlet component 302, and the backflow end 3033 is connected to the backflow pipe 4013 of the water vapor separation device 40 by a pipe. The angles of the narrowed hole 3011 and the diffusion hole 3023 can be adjusted to adapt to different flow requirements. In this way, 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 are completed.

[0052] Based on the Venturi effect, when the preheated pure water is sprayed out of the narrowed hole 3011 of the water inlet component 301 at a certain speed (the flow rate can reach 1200 m / s), the flow rate increases and the pressure decreases, forming a vacuum negative pressure area 3034 inside the backflow component 303. The negative pressure will suck the backflow liquid from the water vapor separation device 40. When the high-speed sprayed pure water passes through the straight flow hole and the diffusion hole 3023, the diffusion hole 3023 is designed to restore the pressure and reduce the energy loss, ensuring that the water enters the heat exchange system 20 stably.

[0053] The water vapor separation device 40 is provided with a separation cavity 401, which is usually a vertical cylindrical container. The side wall of the separation cavity 401 is connected to the steam exhaust pipe 205, the upper part of the separation cavity 401 is used for discharging dry steam, and the lower part is connected to the backflow end 3033 of the backflow component 303 through the backflow pipe 4013. The separation cavity 401 is provided with a separation structure, which separates the wet steam evaporated by the heat exchange system 20 by using the principle of gravity or centrifugal force. Dry steam is discharged upward due to its small density, and water sinks due to its large density, and is sucked into the backflow component 303 under the action of the vacuum negative pressure of the flow control device 30, and reenters the heat exchange system 20. If necessary, a liquid level sensor or an automatic drain valve can be added to the separation cavity 401 to control the amount of backflow liquid.

[0054] Therefore, by setting the flow control device 30 between the preheating system 10 and the heat exchange system 20, replacing the power water circulation mode of the traditional water pump, the unpowered water circulation works, which can reduce the risk of failure, reduce maintenance costs, save energy, and ensure the overall water circulation flow by the vacuum negative pressure formed by the flow control device 30 to automatically recover the separated pure water in the water vapor separation device 40, overcoming the cavitation caused by the decrease of the inlet pressure or the excessive water temperature when the traditional water pump is used to pump water circulation; At the same time, the water circulation flow is greatly improved, and the water flow through the main heat exchanger is increased from 4L / min in the traditional mode to 7-10L / min without increasing the total water flow (such as 250kg total water flow), which effectively prevents the pipeline from overheating and damaging, and the overall steam generation efficiency is improved by more than 2 times compared with the traditional mode.

[0055] And by setting the water vapor separation device 40 to recover water in steam, combined with the pure water recycling and replenishment of the flow control device 30, steam waste is reduced to further avoid water circulation shortage and improve steam dryness (up to more than 99%), improve steam quality, and ensure long-term stable operation of the system.

[0056] Regarding the further optimization of the straight-through hole structure, the straight-through hole includes a first straight-through hole 3021 and a second straight-through hole 3022, both of which are machined inside the water outlet component 302. Among them, the first straight-through hole 3021 is arranged opposite and coaxial with the narrowed hole 3011 at the end of the water inlet component 301, and the outlet diameter of the narrowest end of the narrowed hole 3011 is equal to the hole diameter of the first straight-through hole 3021 (for example, 5mm in diameter), which is used to ensure that the water sprayed by the water inlet component 301 can smoothly transition between the narrowed hole 3011 and the first straight-through hole 3021.

[0057] The second straight-through hole 3022 is arranged at the end of the first straight-through hole 3021, coaxially arranged, and the hole diameter is larger than that of the first straight-through hole 3021 (for example, 9mm in diameter). The diffusion hole 3023 is arranged at the end of the second straight-through hole 3022, and the hole diameter of the diffusion hole 3023 gradually increases outward from the end of the second straight-through hole 3022.

[0058] Therefore, the first straight-through hole 3021 of the water outlet component 302 is used to maintain high water flow, the second straight-through hole 3022 is used to preliminarily expand the pressure and reduce turbulence, and the diffusion hole 3023 is prepared. This step-by-step design reduces pressure fluctuations, improves flow control accuracy, avoids water hammer phenomenon, and further enhances system stability. In actual application, the number of straight-through holes of the water outlet component 302 can be increased to multiple stages, and the hole diameter gradually increases, so as to optimize the water inlet flow field of the heat exchange system 20.

[0059] Further optimization of the converging nozzle 3011 and the diffuser hole 3023, wherein the converging nozzle 3011 gradually narrows outward from the end of the inner diameter of the water inlet component 301 (e.g., a tapered nozzle), the included angle β between the inner hole wall and the axis is 20° to 30°, and the diameter of the hole is 0.8-5mm. Its smaller included angle optimization setting (relative to the traditional Venturi tube) and the combination of water flow characteristics accelerate the water flow, enhance the negative pressure effect, strengthen the vacuum negative pressure, more effectively recover water, prevent cavitation, and improve the back absorption efficiency. In practical application, the material of the converging nozzle 3011 can also be selected from stainless steel or wear-resistant ceramic to prolong the service life.

[0060] The diffuser hole 3023 is coaxially arranged with the second straight hole 3022, and the diffuser hole 3023 gradually expands outward from the end of the second straight hole 3022 (e.g., a tapered nozzle), the included angle θ between the inner hole wall and the axis is 8° to 10°, and the diameter is 3-10mm. The angle is determined by fluid simulation optimization. The diffuser hole 3023 converts kinetic energy into pressure energy through the shape of the diffuser hole 3023, restores the water flow pressure, reduces the resistance of the water entering the heat exchange system 20, thereby reducing energy loss, improving the water pressure of the heat exchange, and ensuring uniform evaporation. In practical application, the inner wall of the diffuser hole 3023 can be processed into a spiral line to promote mixing.

[0061] Further optimization of the structure of the separation sleeve 402 of the water vapor separation device 40, a plurality of layers of separation sleeves 402 (e.g., 4 layers) are arranged in the separation cavity 401, the number of sleeve layers can be adjusted according to the steam flow, and the sleeves are arranged layer by layer from the inside to the outside. Each layer of sleeve is a cylinder, and a plurality of air guide holes 4021 (diameter 2mm-5mm) are formed in the sleeve wall, a plurality of air guide holes 4021 are arranged along the axial direction of the separation sleeve 402, and the air guide holes 4021 can be rectangular holes arranged along the axial direction of the sleeve, or can be designed as a louver type.

[0062] When the separation sleeve 402 is sleeved, the diameters of each sleeve are set so that a gas guide gap 4022 (width 5mm-10mm) is reserved between adjacent sleeves.

[0063] In addition, by reversely arranging the air guide holes 4021 of each layer of sleeve (for example, the inner layer holes are to the left, the middle layer holes are to the right, and the outer layer holes are to the left), the steam path is wrapped and zigzagged.

[0064] Therefore, through the optimized design of the sleeve layer, the gas guide gap 4022 and the air guide hole 4021 of the separation sleeve 402, the wet steam coming out of the heat exchange system 20 changes direction multiple times when it enters the separation sleeve 402 along the gas guide gap 4022 path and passes through the reverse air guide hole 4021, and the water condenses and sinks due to inertia, reducing water entrainment and improving water vapor separation efficiency, and further improving steam dryness.

[0065] Further limited by the interface and separation sleeve 402 package of separation chamber 401, the side wall of separation chamber 401 is provided with steam inlet 4011, steam outlet 4012 is connected with steam exhaust pipe 205, the upper end is provided with steam outlet 4012, the steam outlet 4012 is connected with the application end, the lower end is provided with liquid return pipe 4013, the liquid return pipe 4013 is connected with the liquid return end 3033 of the reflux component 303.

[0066] The upper and lower end covers of the separation sleeve 402 are provided with upper separation end plate 403 and lower separation end plate 404. The upper end plate is provided with upper end plate hole 4031 in the middle, and the upper end plate hole 4031 is coaxial with the steam outlet 4012 and the center sleeve. The lower end plate is provided with lower end plate hole 4041, and the lower end plate hole 4041 is in communication with the liquid return pipe 4013 and the gas guiding gap 4022. The upper and lower end plates can be designed as detachable type, which is convenient for cleaning.

[0067] The steam inlet 4011 is in communication with the outermost gas guiding gap 4022 of the separation sleeve 402. The wet steam generated by the heat exchange system 20 is laterally introduced into the separation chamber 401, spirally rises along the gas guiding gap 4022 of the separation sleeve 402, and is separated layer by layer through the gas guiding holes 4021. The dry steam is discharged from the top, and the moisture is attached to the outer wall of the sleeve and sinks to the bottom, and then flows back to the reflux component 303 through the bottom end plate hole 4041 and the liquid return pipe 4013. Therefore, by optimizing the flow path of the water vapor separation device 40, the pressure loss is reduced, and the continuous separation and reflux of the wet steam are realized.

[0068] The heat exchange area of the heat exchange system 20 in the embodiment is designed in layers, including first heat exchange area 201 and second heat exchange area 204. The second heat exchange area 204 is located above the first heat exchange area 201, and both areas are provided with a plurality of layers of heat exchange pipes. The uppermost layer of the first heat exchange area 201 is in communication with the lowermost layer of the heat exchange pipes of the second heat exchange area 204 through the converging water inlet pipe 206.

[0069] The first heat exchange area 201 is connected with the separated water inlet pipe 203, the converging end of the separated water inlet pipe is connected with the diffusion hole 3023 of the water outlet component 302, and the separated end of the separated water inlet pipe 203 is connected with at least two pipes connected with the lowermost layer of the heat exchange pipes of the first heat exchange area 201. The separated water inlet pipe 203 uniformly distributes water to the plurality of heat exchange pipes of the first heat exchange area 201, further improving the heat exchange efficiency.

[0070] The first heat exchange area 201 performs preliminary evaporation to generate wet steam, and the second heat exchange area 204 performs secondary heating to improve the steam dryness. The uppermost layer of the heat exchange pipes of the second heat exchange area 204 is connected with the steam exhaust pipe 205, and the steam obtained by further heating and evaporation is transported to the water vapor separation device 40 from the steam exhaust pipe 205.

[0071] Therefore, by designing the heat exchange system 20 in layers, the heat exchange path is prolonged, multi-stage evaporation is formed, the evaporation efficiency is improved, local overheating is avoided, and the steam quality is guaranteed.

[0072] The heat exchange pipe of the first heat exchange zone 201 is a circular pipe and is arranged in layers on both sides of the combustion chamber (e.g., 6 layers). The heat exchange pipe of the second heat exchange zone 204 is a square pipe and is arranged in layers above the first heat exchange zone 201 (e.g., 6 layers). The pipe can be coated with a corrosion-resistant coating, regardless of whether it is a circular pipe or a square pipe, to improve the service life of the heat exchange pipe.

[0073] The heat exchange system 20 of the embodiment has the following advantages. The first heat exchange zone 201 has relatively high combustion temperature and water pressure, and the circular pipe has good pressure resistance and is suitable for a high-temperature zone. The second heat exchange pipe has a large heat exchange area and is suitable for a low-temperature steam zone. In this way, heat distribution is optimized, heat efficiency is improved, and the service life of the equipment is extended.

[0074] The embodiment also provides a steam generation method, which is realized based on the above-described steam generator. The steam generation method comprises the following steps.

[0075] S1, a preheating stage, in which external purified water enters the preheating system 10, and the purified water is heated to a 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.

[0076] S2, a heat exchange stage, in which the preheated water flows out of the preheating outlet pipe 101 and is delivered to the flow control device 30, is sprayed out through the narrowed hole 3011 of the water inlet component 301 (the flow rate can reach 110 m / s), and a vacuum negative pressure is formed in the backflow component 303. The water sequentially passes through the straight-through hole, the diffusion hole 3023 and the heat exchange inlet pipe 202, enters the first heat exchange zone 201 of the heat exchange system 20, is heated by the high-temperature flue gas (1100-1300℃) generated by the burner of the combustion chamber to generate wet steam, and the wet steam is secondarily heated and evaporated in the second heat exchange zone 204 through the converging inlet pipe 206 to obtain wet steam with relatively low humidity. The water is automatically backflowed through the Venturi effect, without the need for an additional water pump, thereby saving energy and reducing consumption and preventing cavitation.

[0077] S3, a water-steam separation stage, in which the wet steam enters the water-steam separation device 40 through the steam outlet pipe 205, the separated dry steam is discharged to the use end, and the separated water is sucked back to the backflow component 303 by the action of the vacuum negative pressure after sinking, and is re-entered into the heat exchange system 20 to participate in heating and evaporation. The water is recycled, the water circulation effect is improved, and the steam dryness is improved.

[0078] Further limited to the water vapor separation step, a plurality of separation sleeves 402 are arranged in the separation cavity 401 of the water vapor separation device 40, and each layer of the gas guide holes 4021 is arranged reversely. The wet steam enters the separation sleeve 402, flows around along the gas guide gap 4022 and through the gas guide holes 4021, and the water is impacted on the wall and sinks, and the dry steam is discharged from the steam outlet 4012. The sinking water is sucked back to the reflux component 303 under the vacuum negative pressure, and after being mixed with the new preheated water, it reenters the heat exchange system 20. Through the combination of inertial separation and condensation, deep water vapor separation is performed, and the water vapor separation is more thorough.

[0079] Through the optimization design of the above steam efficient generation method, in the pure water heat exchange evaporation process, the water circulation balance is automatically maintained, the water flow of the main heat exchanger is increased by 50%-150%, the heat exchanger is protected from being burned out, the high-temperature separated water is directly used without additional power, the high-temperature separated water is changed into steam with very little energy, the steam dryness is kept above 99%, a more efficient energy-saving heat exchange steam working mode is realized, and the service life of the steam generator is doubled.

[0080] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A high efficiency steam generator characterized by, The system comprises a preheating system, a heat exchange system, a flow control device and a water-vapor separation device. The preheating system is connected with a preheating outlet pipe. The heat exchange system has a heat exchange area, the upper part of the heat exchange area is connected with a steam discharge pipe, and the lower part is connected with a heat exchange inlet pipe. The flow control device comprises an inlet part, an outlet part and a reflux part; the front end of the inlet part is connected with the preheating outlet pipe, the tail end is provided with a narrow hole and is connected with the liquid inlet end of the reflux part; the front end of the outlet part is provided with a straight flow hole and is connected with the liquid outlet end of the reflux part, the tail end is provided with a diffusion hole and is connected with the heat exchange inlet pipe. The pure water preheated by the preheating system is sprayed from the narrow hole of the inlet part to form a vacuum negative pressure area in the reflux part, and the pure water sequentially passes through the straight flow hole, the diffusion hole of the outlet part and the heat exchange inlet pipe to enter the heat exchange system for heat exchange and evaporation. The water-vapor separation device is provided with a separation cavity, the separation cavity is connected with the steam discharge pipe and the liquid return end of the reflux part, the dry steam separated by the water-vapor separation device is directly discharged to the application end, the separated water sinks and is sucked into the reflux part under the action of the vacuum negative pressure, and then reenters the heat exchange system for heat exchange and evaporation.

2. The high efficiency steam generator of claim 1, wherein, The straight flow hole comprises a first straight flow hole and a second straight flow hole, the first straight flow hole is arranged opposite to and coaxial with the narrow hole at the tail end of the inlet part; the diameter of the first straight flow hole is equal to the outlet diameter of the narrow hole; the second straight flow hole is arranged at the tail end of the first straight flow hole and coaxial with the first straight flow hole, and the diameter of the second straight flow hole is larger than that of the first straight flow hole; the diffusion hole is arranged at the tail end of the second straight flow hole.

3. The high efficiency steam generator of claim 2, wherein, The diffusion hole is arranged at the tail end of the second straight flow hole and coaxial with the second straight flow hole; the diffusion hole gradually expands outward from the tail end of the second straight flow hole, and the included angle between the inner hole wall of the diffusion hole and the axis is 8° to 10°.

4. The high efficiency steam generator of claim 1, wherein, The narrow hole gradually narrows outward from the tail end of the inner diameter of the inlet part, and the included angle between the inner hole wall of the narrow hole and the axis is 20° to 30°.

5. The high efficiency steam generator of claim 1, wherein, The separation cavity is provided with a plurality of layers of separation sleeve pipes, the plurality of layers of separation sleeve pipes are arranged in layers from inside to outside; a plurality of air guide holes are formed in the pipe wall of each layer of separation sleeve pipe, an air guide gap is formed between adjacent two layers of separation sleeve pipes, and the air guide holes arranged in each layer of separation sleeve pipe are reversely arranged, so that the wet steam passes through the air guide holes and surrounds each layer of separation sleeve pipe for water-vapor separation.

6. The high efficiency steam generator of claim 5, wherein, The side wall of the separation cavity is provided with a steam inlet, the upper end is provided with a steam outlet, and the lower end is provided with a liquid return pipe; The upper and lower ends of the separation sleeve pipe are respectively covered with an upper separation end plate and a lower separation end plate, the upper separation end plate is provided with an upper end plate hole, the upper end plate hole is coaxial with the steam outlet and the separation sleeve pipe in the central part; the lower separation end plate is provided with a lower end plate hole, the lower end plate hole is in communication with the liquid return pipe and the air guide gap; The steam inlet is in communication with the air guide gap of the outermost layer. The wet steam enters from the steam inlet, is separated by the water vapor separation device, and the dry steam is discharged upward from the steam outlet to the application end, and the separated water sinks and is discharged from the liquid return pipe to the return component.

7. The high efficiency steam generator of any one of claims 1-6, wherein, The heat exchange zone comprises a first heat exchange zone and a second heat exchange zone, the second heat exchange zone is arranged above the first heat exchange zone and communicates with the first heat exchange zone through a converging water inlet pipe; the first heat exchange zone is connected with a shunt water inlet pipe, and the second heat exchange zone is connected with the steam discharge pipe; The converging end of the shunt water inlet pipe is connected with the diffusion hole at the end of the water outlet component, and the shunt end is connected with the heat exchange pipe of the first heat exchange zone, so that the pure water enters the heat exchange pipes of the first heat exchange zone through the shunt water inlet pipe to generate wet steam by heating and evaporation, and the wet steam enters the second heat exchange zone above for secondary heating and evaporation, and then enters the water vapor separation device.

8. The high efficiency steam generator of claim 7, wherein, The heat exchange pipes of the first heat exchange zone are circular pipes and are arranged in layers on both sides of the combustion chamber, and the heat exchange pipes of the second heat exchange zone are square pipes and are arranged in layers above the first heat exchange zone.

9. A method for efficient steam generation, characterized by, The high-efficiency steam generator comprises a preheating system, a heat exchange system, a flow control device and a water vapor separation device, the flow control device comprises a water inlet component, a water outlet component and a return component, and the method comprises the following steps: S1, preheating stage, the pure water is preheated to a set water temperature through the preheating system; S2, heat exchange stage, the preheated water flows out from the preheating water outlet pipe, is high-speed injected through the narrowing hole of the water inlet component, forms a vacuum negative pressure area in the return component, and makes the pure water enter the heat exchange system through the straight-through hole, the diffusion hole and the heat exchange water inlet pipe of the water outlet component in sequence to exchange heat and evaporate; S3, water vapor separation stage, the wet steam obtained by heat exchange of the heat exchange system enters the water vapor separation device for water vapor separation, the dry steam is discharged upward to the application end, and the separated water is sucked back into the return component by the vacuum negative pressure after sinking, and participates in evaporation again.

10. The steam efficient generation method of claim 9, wherein, In the water vapor separation step, a plurality of layers of separation sleeve pipes are arranged in the separation cavity of the water vapor separation device, gas guide holes are arranged on the pipe wall of each layer of separation sleeve pipes, gas guide gaps are formed between adjacent separation sleeve pipes, and the gas guide holes of each layer of separation sleeve pipes are reversely arranged; the wet steam flows around and collides when entering the gas guide gaps and passing through the gas guide holes, thereby performing deep water vapor separation.

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