A low-nitrogen gas steam device capable of quickly discharging steam

Abstract

The utility model discloses a kind of low nitrogen gas steam devices of quick steam, belong to steam boiler technical field.The steam device adopts sectional heat exchange structure, including burner, steam generator, steam superheater, water tank and condenser.Burner produces heat energy and flue gas by combustible gas combustion, directly heats the water in steam generator to generate saturated steam;Saturated steam is further heated to superheated steam output by steam superheater.The device realizes flue gas step-by-step flow by flue assembly: flue gas sequentially passes through the first flue of steam generator, the second flue of steam superheater, the third flue below water tank and the fourth flue of condenser, and carries out multistage heat exchange with each section water or steam.Water tank is communicated with steam generator and condenser by pipeline, forms complete water circulation system, and overall realizes efficient energy cascade utilization.The steam device has the advantages of quick steam, high steam dryness, low energy consumption, compact structure and the like.

Description

Technical Field

[0001] This utility model relates to the field of steam boiler technology, and in particular to a low-nitrogen gas-fired steam generator capable of rapidly producing steam. Background Technology

[0002] Gas-fired steam boilers, as important heat energy conversion equipment in industrial production, convert water into steam or high-temperature water by burning fuels such as natural gas and liquefied petroleum gas, and are widely used in chemical, pharmaceutical, and food processing industries. However, with increasingly stringent environmental protection requirements and continuous improvements in production efficiency, traditional gas-fired steam boilers have gradually revealed the following technical bottlenecks in terms of structural design and energy utilization: Firstly, regarding emissions and environmental protection, existing steam boilers generally suffer from high nitrogen oxide (NOx) emissions. Due to limitations in combustion mechanisms and structures, the NOx content in the flue gas they generate is insufficient to meet increasingly stringent ultra-low NOx emission standards, making such equipment unsuitable for applications with higher environmental requirements. Simultaneously, a large amount of waste heat carried in the high-temperature flue gas is not effectively recovered and is typically released directly into the atmosphere, resulting in energy waste.

[0003] Secondly, although some existing steam boilers are equipped with condensation systems to reduce flue gas temperature, the condensate generated during the condensation process is often not further utilized and is instead discharged directly. This practice not only increases water consumption but also incurs additional wastewater treatment costs, failing to achieve energy cascade and recycling.

[0004] Third, in terms of heat exchange structure, the flue gas velocity in existing steam boilers is relatively fast and the residence time is short. In addition, the heat exchange surface is of a single type and the process design is simple, which makes the heat exchange insufficient and the overall heat exchange efficiency low, thus limiting the further improvement of the system thermal efficiency.

[0005] Finally, regarding steam generation quality and response speed, existing steam boilers typically require a large initial injection of cold water, resulting in a long preheating time and slow steam output during start-up and load changes, thus affecting the pace of continuous production. Furthermore, due to the instability of the vaporization process, the resulting saturated steam often has high water content and large pressure fluctuations, making it difficult to meet the stringent requirements of industries such as pharmaceuticals, electronics, and high-end foods for steam dryness, stability, and cleanliness.

[0006] In summary, existing gas-fired steam boilers still have significant shortcomings in terms of energy saving and emission reduction, heat recovery efficiency, structural optimization, and steam quality control. There is an urgent need for those skilled in the art to develop a new type of gas-fired steam device with low-NOx combustion, high-efficiency heat exchange, and rapid steam stabilization. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a low-nitrogen gas-fired steam generator capable of rapidly producing steam, thereby solving the problems in the background technology.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: This utility model provides a low-NOx gas-fired steam device that can quickly produce steam. The steam device includes a burner, a steam generator, a steam superheater, a water tank, and a condenser. The steam generator, the steam superheater, the water tank, and the condenser are connected in sequence through a flue assembly to form a segmented heat exchange structure. The steam generator contains a small amount of water and has a combustion chamber and a first flue communicating with the combustion chamber. The first flue is equipped with a turbulence structure. The burner includes a furnace located below the combustion chamber. The furnace burns combustible gas and generates heat energy and flue gas. The heat energy is used to heat water in the steam generator to produce saturated steam. The saturated steam is superheated by the steam superheater to form superheated steam, which is then output through the outlet. The steam superheater is provided with a second flue and is connected to the steam generator through a first pipe. The water tank is connected to the steam generator via a second pipe and to the condenser via a third pipe; The flue gas flows sequentially through the first flue, the second flue, the third flue below the water tank, and the fourth flue inside the condenser, and exchanges heat with the water or steam in each section in a step-by-step manner.

[0009] In one possible implementation, the steam generator is cylindrical, the combustion chamber is located at the lower part of the steam generator, the number of first flues is multiple and arranged in an array above the steam generator, and the turbulence structure in the first flue is specifically a turbulence plate, which is a spiral structure. The flue gas enters the first flue from the combustion chamber located at the bottom of the steam generator and spirals upward around the baffle. During the upward process, the flue gas exchanges heat with the water in the cavity.

[0010] In one possible implementation, the steam superheater is located above the steam generator, and a flue gas mixing zone is provided between the steam superheater and the steam generator. The flue gas mixing zone is located at the bottom of the steam superheater and the top of the steam generator.

[0011] In one possible implementation, the stove is a regenerative flameless infrared radiation combustion type and includes a furnace body, a grate, and a heat storage body, wherein: The furnace body is provided with an annular furnace cavity and a spiral flow guide channel, and a tangential air inlet is provided at the bottom of the flow guide channel; The grate is located at the upper part of the furnace cavity and has several grate holes. A gas outlet pipe is inserted into the grate hole, and a burner is inserted into the gas outlet pipe. The heat storage body is located above the grate and has heat storage holes corresponding to the grate holes. The gas outlet pipe and the burner are inserted into the heat storage holes.

[0012] In one possible implementation, the combustible gas enters the guide channel through the tangential air inlet, generating a rotating flow and undergoing radial migration under centrifugal force to achieve pressure equalization within the furnace cavity; after pressure equalization, the combustible gas enters the gas outlet pipe through the grate and undergoes flameless combustion above the burner; the heat storage body absorbs combustion heat energy and converts it into infrared radiation energy; the heat energy is transferred to the steam generator via heat conduction, heat convection, and heat radiation.

[0013] In one possible implementation, the steam device further includes a level gauge, a makeup water pump, a control valve, an inlet water pump, and a thermometer, wherein: The level gauge is installed on the steam generator to monitor the water level inside the steam generator, and the water replenishment pump is installed on the second pipeline to replenish water to the steam generator according to the water level signal sent by the level gauge. The control valve is located on the first pipeline and is used to regulate the pressure and flow rate of the saturated steam entering the steam superheater. The water inlet pump is installed on the water inlet pipe of the condenser and is used to control the water inlet volume; The thermometer is installed on the water tank and is used to monitor the water temperature inside the tank.

[0014] In one possible implementation, the water tank is a non-enclosed structure and has an overflow outlet, and the water temperature inside the water tank does not exceed 100°C.

[0015] In one possible implementation, the water inlet pipe is used to receive external water, which first enters the condenser through the water inlet pipe, then enters the water tank through the third pipe, and finally enters the cavity of the steam generator through the second pipe.

[0016] In one possible implementation, the flue gas and water flow are arranged in a countercurrent heat exchange configuration within the steam device, with the temperature of the flue gas decreasing progressively along its flow direction and the temperature of the water flow increasing progressively along its flow direction.

[0017] In one possible implementation, the temperature gradient of the flue gas in each section of the steam device is T0 > T1 > T2 > T3 > T4, where T0 is the temperature of the flue gas in the combustion chamber, T1 is the temperature of the flue gas in the first flue, T2 is the temperature of the flue gas in the second flue, T3 is the temperature of the flue gas in the third flue, and T4 is the temperature of the flue gas in the fourth flue. The temperature of the flue gas in each section of the steam device is inversely proportional to the water temperature in each section of the steam device. The gradient change of the water temperature in each section of the steam device is T5 < T6 < T7 < T8, where T5 is the water temperature of the external water, T6 is the water temperature of the water in the condenser, T7 is the water temperature of the water in the water tank, and T8 is the water temperature of the water in the steam generator. Beneficial effects

[0018] This utility model provides a low-NOx gas-fired steam generator capable of rapidly producing steam. The generator employs a segmented, multi-stage heat exchange structure to achieve efficient, tiered utilization of flue gas waste heat. The flue gas flows sequentially through heat exchange channels in the steam generator, superheater, water tank, and condenser, engaging in counter-current heat exchange with water / steam at different temperatures and states. This improves the overall thermal efficiency of the device, effectively reduces exhaust gas temperature, and avoids heat energy waste.

[0019] This utility model provides a low-NOx gas-fired steam device that can quickly produce steam. The burner adopts regenerative flameless infrared radiation combustion technology, which is suitable for use in small, enclosed combustion spaces. Through tangential air intake and spiral flow guiding structure, it achieves uniform gas distribution and pressure self-balancing. Combined with a porous grate and regenerator structure, it achieves stable and efficient flameless combustion, suppresses the generation of nitrogen oxides (NOx), and meets the requirements for ultra-low NOx emissions.

[0020] This utility model provides a low-NOx gas-fired steam generator capable of rapidly producing steam. This generator extends the flue gas residence time and enhances the heat transfer process by incorporating spiral baffles within the steam generator flue, thereby improving the heat exchange efficiency of the steam generator. Simultaneously, a steam superheater further superheats the saturated steam, significantly improving its dryness and quality, outputting pure, stable, and low-moisture-content superheated steam to meet the process requirements of high-end industrial applications.

[0021] This utility model provides a low-NOx gas-fired steam generator that can quickly produce steam. This steam generator achieves efficient recovery and recycling of condensate. The condensate is no longer directly discharged, but is preheated in stages through the condenser and water tank and then returned to the steam generator as high-temperature makeup water. This reduces water consumption and treatment costs, significantly shortens heating time, and improves system response speed and steam output efficiency.

[0022] This utility model provides a low-nitrogen gas-fired steam generator that can quickly produce steam. The steam generator integrates automatic control components such as a level gauge, a water supply pump, and a control valve to achieve accurate monitoring of the water level and continuous water supply, ensuring the continuity and stability of steam output, avoiding pressure fluctuations, and further improving steam quality and operational safety.

[0023] This utility model provides a low-NOx gas-fired steam generator that can quickly produce steam. The steam generator has a compact structure and reasonable layout, and is especially suitable for industrial scenarios with limited space or strict environmental protection requirements. It has significant advantages in energy saving, emission reduction and economy, and has broad application prospects in chemical, pharmaceutical, food processing and other fields. Attached Figure Description

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0025] Figure 1 This is a top view of the steam device in Embodiment 1 or 3; Figure 2 for Figure 1 AA section view in the middle; Figure 3 This is a schematic diagram of the flue gas flow in the steam device of Embodiment 1 or 3; Figure 4 This is a schematic diagram of the water flow in the steam device of Example 1 or 3; Figure 5 This is an exploded view of the stove structure in Example 2; 1-Steam generator; 11-Combustion chamber; 12-First flue; 13-Baffle plate; 14-Second pipe; 15-Level gauge; 16-Make-up water pump; 2-Burner; 21-Stove fixture; 211-Stove body; 212-Grate; 213-Heat regenerator; 214-Gas outlet pipe; 215-Burnhead; 3-Steam superheater; 31-Steam outlet; 32-Second flue; 33-First pipe; 4-Water tank; 41-Third pipe; 42-Thermometer; 43-Third flue; 5-Condenser; 51-Fourth flue; 52-Water inlet pipe; 53-Water inlet pump. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. In addition, for the sake of convenience, the terms "upper", "lower", "left", and "right" are equivalent to the upper, lower, left, and right directions of the accompanying drawings themselves, and the terms "first", "second", etc., are used for descriptive distinction and have no other special meaning.

[0027] To address the shortcomings of existing steam boilers, this utility model provides a low-NOx gas-fired steam generator capable of rapidly producing steam. This steam generator includes a burner, a steam generator, a steam superheater, a water tank, and a condenser. The steam generator, steam superheater, water tank, and condenser are sequentially connected via a flue assembly, forming a segmented heat exchange structure, as detailed below: The steam generator contains a small amount of water and includes a combustion chamber and a first flue connected to the combustion chamber. The first flue contains a turbulence structure. The steam generator is cylindrical, with the combustion chamber located at its lower part. Multiple first flues are arranged in an array above the steam generator. The turbulence structure within the first flues consists of spiral baffles. Flue gas enters the first flue from the combustion chamber at the lower part of the steam generator and spirals upwards around the baffles, exchanging heat with the water within the chamber during its ascent.

[0028] In specific applications, the amount of water in the steam generator is far less than the amount of water injected into a traditional steam boiler at one time. Furthermore, the amount of water in the steam generator is ideally sufficient for rapid vaporization and continuous generation of saturated steam, typically controlled to just cover the heating area at the bottom of the generator. This reduces the heat load required for initial heating and water replenishment during operation, enabling the limited amount of water to be rapidly heated to its boiling point and steam generated during startup, significantly shortening the steam output time and improving the response speed of the steam unit.

[0029] In specific application scenarios, a combustion chamber is located at the bottom of the steam generator, which is directly connected to the first flue. The combustion chamber is situated directly below the steam generator, with its top opening connecting to the steam generator cavity and its bottom receiving the flame and high-temperature flue gas from the burner. This allows the heat energy generated by the burner to directly and efficiently act on the water within the cavity, reducing heat loss in intermediate transfer stages. Simultaneously, the high-temperature flue gas immediately enters the first flue after generation, achieving a seamless connection between heat energy generation and utilization.

[0030] In specific application scenarios, the first flue is located at the top of the steam generator, and there are multiple first flues arranged in an array. The first flue is a set of heat exchange tube bundles that runs through the steam generator cavity, with its lower end connected to the combustion chamber and its upper end opening into the flue gas mixing zone at the top of the steam generator. A specific turbulence structure is installed inside the flue, preferably a spiral turbulence vane fixed to the inner wall of the flue. When the high-temperature flue gas enters the first flue from the lower combustion chamber, it is guided by the turbulence vane and does not rise in a straight line, but is forced to rotate along a spiral trajectory, prolonging the flue gas residence time, enhancing the heat transfer process, and improving the heat exchange efficiency of the steam generator.

[0031] The burner includes a stove located below the combustion chamber. The stove burns combustible gas and generates heat and flue gas. The heat is used to heat water in the steam generator to produce saturated steam.

[0032] In some examples, the stove is a regenerative flameless infrared radiation combustion appliance, and includes a furnace body, a grate, and a heat storage body. The furnace body has an annular furnace cavity and a spiral guide channel, with a tangential air inlet at the bottom of the guide channel. The grate is located at the upper part of the furnace cavity and has several grate holes. An exhaust pipe is inserted into the grate hole, and a burner is inserted into the exhaust pipe. The heat storage body is located above the grate and has heat storage holes corresponding to the grate holes. The exhaust pipe and the burner are inserted into the heat storage holes.

[0033] In some examples, combustible gas enters the guide channel through a tangential inlet, generating a rotating flow and undergoing radial migration under centrifugal force to achieve pressure equalization within the furnace cavity, preventing the formation of localized high-temperature zones and effectively suppressing the generation of nitrogen oxides (NOx). After pressure equalization, the combustible gas enters the outlet pipe through the grate and undergoes flameless combustion above the burner. The regenerator absorbs the combustion heat energy and converts it into infrared radiation energy; the heat energy is transferred to the steam generator via heat conduction, heat convection, and heat radiation.

[0034] In specific applications, this stove is directly connected to the combustion chamber of the steam generator, resulting in a short heat transfer path and minimal loss. Combined with flameless combustion and infrared radiation heat transfer mechanisms, it improves thermal efficiency while achieving ultra-low nitrogen emissions, meeting environmental protection requirements. Furthermore, its pressure self-balancing structure and spiral air intake ensure combustion stability, making it suitable for rapid start-up and shutdown as well as high-load variable-condition operation.

[0035] Furthermore, the burner also includes an air distribution assembly, which includes a global mixing valve group and a fan. The global mixing valve group is connected to the air inlet of the burner fan, and the air outlet of the burner fan is connected to the air inlet of the burner body via a pipe. The combustible gas formed by the global mixing valve group is continuously transported to the burner body by the burner fan.

[0036] For details regarding the specific structural features of the stove and air distribution components in the burner of this application, please refer to the contents of the applicant's Chinese Utility Model Patent Application No. 202510843627.1, entitled "A Heat Storage Flameless Infrared Radiation Combustion Stove," which the applicant will not elaborate on here.

[0037] Saturated steam is superheated in a steam superheater to form superheated steam, which is then discharged through an outlet. The steam superheater has a second flue and is connected to the steam generator via a first pipe. The steam superheater further superheats the saturated steam, significantly improving its dryness and quality, and outputting pure, stable, and low-moisture superheated steam. This meets the process requirements of high-end industrial applications, making this steam unit a promising candidate for applications in chemical, pharmaceutical, and food processing industries.

[0038] In some examples, the steam superheater is located above the steam generator, and a flue gas mixing zone is provided between the steam superheater and the steam generator. The flue gas mixing zone is located at the bottom of the steam superheater and the top of the steam generator. The flue gas mixing zone prevents flue gas from being trapped in the first flue and unable to enter the second flue due to the misalignment of the central axis of the second flue with the central axis of the first flue.

[0039] The water tank is connected to the steam generator via a second pipe and to the condenser via a third pipe.

[0040] In specific application scenarios, the water tank receives preheated water from the condenser via a third pipe. This water is temporarily stored in the tank and further heated by the flue gas flowing through the third flue below, achieving secondary preheating. Subsequently, this higher-temperature water is supplied to the steam generator as makeup water via a second pipe. This not only achieves efficient recycling of condensate and saves water resources, but more importantly, it reuses low-temperature heat energy that might otherwise be wasted, reducing the heat load required to directly heat cold water to its boiling point and significantly improving the overall thermal efficiency of the system.

[0041] In some examples, the water tank is not enclosed and has an overflow outlet, and the water temperature inside the tank does not exceed 100°C.

[0042] In specific applications, the non-enclosed water tank structure keeps its interior constantly open to the atmosphere, maintaining atmospheric pressure, thus serving as a natural buffer and safety container. Specifically: Firstly, the water tank receives and temporarily stores the unstable water flow from the condenser, then supplies water to the steam generator in a stable state, ensuring a relatively stable water level in the steam generator and reducing frequent start-stop cycles of the makeup water pump and hydraulic shock to the steam generator. Secondly, the atmospheric pressure design completely avoids the possibility of the water tank itself becoming a pressure vessel, eliminating the need for pressure-bearing design, simplifying the structure, and reducing manufacturing costs and safety risks. The overflow port further ensures safety; in the event of a control failure, excess water can be discharged through the overflow port to prevent the water tank from overflowing and ensure safe system operation.

[0043] The flue gas flows sequentially through the first flue, the second flue, the third flue below the water tank, and the fourth flue inside the condenser, and exchanges heat with the water or steam in each section in a step-by-step manner.

[0044] In specific application scenarios, flue gas, as a heat energy carrier, is not simply emitted, but is forcibly guided through the four heat exchange sections mentioned above. In each section, a specific heating task is performed to transfer its sensible heat to water or steam at different states and temperatures to the maximum extent, until its temperature drops to close to the ambient temperature before being discharged, thus making the energy of the fuel "fully utilized".

[0045] In some examples, the flue gas and water flow are arranged in a countercurrent heat exchange configuration within the steam unit, with the temperature of the flue gas decreasing stepwise along its flow direction and the temperature of the water flow increasing stepwise along its flow direction.

[0046] In specific application scenarios, the flue gas and water flow are arranged in a counter-current heat exchange pattern within the steam unit. That is, the flue gas with the highest temperature T1 first comes into contact with the water with the highest temperature T8, and the flue gas with the lowest temperature T4 finally comes into contact with the water with the lowest temperature T5. The water flow direction is exactly the opposite: the water with the lowest temperature T5 first comes into contact with the flue gas with the lowest temperature T4, and the water with the highest temperature T8 finally comes into contact with the flue gas with the highest temperature T1.

[0047] In some examples, the temperature gradient of the flue gas in each section of the steam device is T0 > T1 > T2 > T3 > T4, where T0 is the temperature of the flue gas in the combustion chamber, T1 is the temperature of the flue gas in the first flue, T2 is the temperature of the flue gas in the second flue, T3 is the temperature of the flue gas in the third flue, and T4 is the temperature of the flue gas in the fourth flue.

[0048] In specific application scenarios, the flue assembly includes not only the first, second, third, and fourth flues, but also a fifth flue. The fifth flue is connected to the fourth flue, and the flue gas exiting from the fourth flue is discharged to the outside through the fifth flue. The specific process and function of the flue gas in the segmented heat exchange are as follows: The flue gas is in the first flue: the flue gas temperature is the highest here, T1, and its task is to be heated at high temperature to generate saturated steam. The flue gas undergoes intense heat exchange with the water in the steam generator cavity, converting the liquid water into saturated steam. The spiral turbulence vane structure in the first flue greatly prolongs the flue gas residence time and enhances the turbulence effect, ensuring the full release of high-temperature heat energy and realizing the "rapid steam output" of this steam device.

[0049] In the second flue: after flowing through the first flue, the flue gas temperature drops to T2, and its task changes to superheating the saturated steam. The flue gas flows through the second flue of the steam superheater, exchanging heat with the saturated steam from the first duct, heating it into superheated steam with higher dryness and more stable quality. This not only improves the steam quality but also fully utilizes the waste heat of the flue gas, avoiding the waste of high-quality thermal energy.

[0050] In the third flue, the flue gas temperature is further reduced to T3 before flowing through the third flue located below the water tank. Its task is to preheat the boiler feedwater. The flue gas exchanges heat with the water in the water tank, providing initial heating. Combining waste heat recovery from the flue gas with boiler water pretreatment significantly reduces the main fuel consumption required to heat cold water to its boiling point, thereby improving the overall thermal efficiency of the unit.

[0051] In the fourth flue, the flue gas temperature has dropped to a lower level (T4) before finally entering the condenser. Its task is to deeply recover waste heat and condense water vapor. The flue gas exchanges heat with low-temperature chilled water (T5) entering the condenser through the inlet pipe, and its temperature drops to near the chilled water temperature before being discharged. This process not only further recovers the sensible heat of the flue gas, but more importantly, the water vapor in the flue gas is condensed into liquid water, releasing a large amount of latent heat of vaporization. This latent heat is absorbed by the chilled water, raising its temperature.

[0052] The temperature of the flue gas in each section of the steam unit is inversely proportional to the water temperature in each section of the steam unit. The gradient change of water temperature in each section of the steam unit is T5 < T6 < T7 < T8, where T5 is the external water temperature, T6 is the water temperature in the condenser, T7 is the water temperature in the water tank, and T8 is the water temperature in the steam generator.

[0053] In some examples, the steam unit also includes a level gauge, a makeup water pump, a control valve, an inlet water pump, and a thermometer, wherein: The level gauge is installed on the steam generator to monitor the water level inside the steam generator, and the water supply pump is installed on the second pipeline to supply water to the steam generator according to the water level signal sent by the level gauge.

[0054] In specific application scenarios, the level gauge and the water supply pump work together to achieve automatic closed-loop control of the water level in the steam generator, ensuring the operational safety of the core steam-producing components and the continuity of steam output.

[0055] A level gauge is installed on the steam generator to monitor its internal water level in real time. When the water level drops to a preset low level due to continuous vaporization, the level gauge sends an electrical signal. The makeup water pump, located on the second pipeline, starts upon receiving this signal, pumping preheated water from the tank into the steam generator cavity to replenish the steam. When the water level returns to the preset high level, the level gauge sends a stop signal, and the makeup water pump stops.

[0056] The addition of a level gauge and a water supply pump prevents the steam generator from burning dry due to lack of water, which could damage the equipment or even cause a safety accident. It also maintains a stable water level, thereby ensuring stable evaporation and steam pressure, and outputting steam of consistent quality. The addition of high-temperature water greatly reduces the heat and time required to heat the water to its boiling point, improving the system's thermal response speed and overall energy efficiency. Furthermore, it enables continuous operation without manual intervention, meeting the requirements of automation and intelligence in modern industrial equipment.

[0057] The control valve is located on the first pipeline and is used to regulate the pressure and flow rate of saturated steam entering the steam superheater.

[0058] In specific application scenarios, control valves can precisely regulate the operating conditions of saturated steam entering the steam superheater, thereby controlling the quality of the final output superheated steam.

[0059] The control valve is located on the first pipeline. By adjusting the opening of this valve, the flow cross-sectional area of ​​the saturated steam can be changed, thereby allowing for precise control of its pressure and flow rate.

[0060] The control valve ensures that the steam pressure entering the superheater is within the optimal design range, guaranteeing the superheater's heat exchange efficiency and operational safety. Flow rate regulation controls the residence time of steam in the second flue of the superheater. Excessive residence time may lead to overheating, while insufficient residence time may result in underheating. By controlling the flow rate, it is ensured that the steam receives just the right amount of superheat, achieving the required superheat and dryness.

[0061] Adding control valves can improve steam quality, optimize system performance, and enhance adaptability.

[0062] The water inlet pump is located on the water inlet pipe of the condenser and is used to control the water inlet flow.

[0063] In specific application scenarios, the function of the inlet pump is to control and ensure a stable supply of working fluid to the entire system, and it is the starting point driving unit of the water circulation.

[0064] The water inlet pump is located on the condenser's inlet pipe. Based on the system's steam consumption, it pumps external cold water into the condenser as needed. The amount of water pumped in determines the final amount of makeup water entering the steam generator, thus matching the system's evaporation rate and maintaining the dynamic balance of the entire water cycle.

[0065] The thermometer is installed on the water tank to monitor the water temperature inside.

[0066] In some examples, the inlet pipe is used to receive external water, which first enters the condenser through the inlet pipe, then enters the water tank through the third pipe, and finally enters the steam generator cavity through the second pipe.

[0067] In specific application scenarios, external water replenishment follows a specific flow path and energy cascade recovery process within the device. This path is not a simple water conveyance channel, but a low-temperature thermal energy capture system deeply coupled with the flue gas waste heat recovery process. This achieves the deepest flue gas waste heat recovery and completes the cascade and preheating utilization of energy, ultimately constructing a complete closed-loop water cycle. Example 1

[0068] Based on the above concept, such as Figure 1-4 As shown, this embodiment provides a steam device for a specific application, such as... Figure 2 As shown, the steam device includes a burner 2, a steam generator 1, a steam superheater 3, a water tank 4, and a condenser 5. The steam generator 1, the steam superheater 3, the water tank 4, and the condenser 5 are connected in sequence through a flue assembly to form a segmented heat exchange structure. like Figure 2 As shown, the steam generator 1 contains a small amount of water and is equipped with a combustion chamber 11 and a first flue 12 communicating with the combustion chamber 11. The first flue 12 is equipped with a turbulence structure. like Figure 2 As shown, the burner 2 includes a furnace 21 located below the combustion chamber 11. The furnace 21 burns combustible gas and generates heat energy and flue gas. The heat energy is used to heat the water in the steam generator 1 to generate saturated steam. like Figure 2 As shown, saturated steam is superheated by the steam superheater 3 to form superheated steam. The superheated steam is output through the outlet 31. The steam superheater 3 is provided with a second flue 32. The steam superheater 3 is connected to the steam generator 1 through the first pipe 33. like Figure 2 As shown, water tank 4 is connected to steam generator 1 through second pipe 14 and to condenser 5 through third pipe 41; Among them, such as Figure 3 As shown, the flue gas flows sequentially through the first flue 12, the second flue 32, the third flue 43 below the water tank 4, and the fourth flue 51 inside the condenser 5, and exchanges heat with the water or steam in each section step by step.

[0069] In the example, the steam generator 1 is cylindrical, the combustion chamber 11 is located at the lower part of the steam generator 1, and there are multiple first flues 12 arranged in an array above the steam generator 1. The turbulence structure in the first flue 12 is a turbulence plate 13, which has a spiral structure. like Figure 3 As shown, the flue gas enters the first flue 12 from the combustion chamber 11 located at the bottom of the steam generator 1 and spirals upward around the baffle 13. During the upward process, the flue gas exchanges heat with the water in the cavity.

[0070] In this example, the steam superheater 3 is located above the steam generator 1, and a flue gas mixing zone is provided between the steam superheater 3 and the steam generator 1. The flue gas mixing zone is located at the bottom of the steam superheater 3 and the top of the steam generator 1.

[0071] In an example, such as Figure 3 , Figure 4 As shown, the flue gas and water flow are arranged in a countercurrent heat exchange pattern within the steam device. The temperature of the flue gas decreases step by step along its flow direction, while the temperature of the water flow increases step by step along its flow direction.

[0072] In the example, the temperature gradient of the flue gas in each section of the steam device is T0 > T1 > T2 > T3 > T4, where T0 is the temperature of the flue gas in the combustion chamber 11, T1 is the temperature of the flue gas in the first flue 12, T2 is the temperature of the flue gas in the second flue 32, T3 is the temperature of the flue gas in the third flue 43, and T4 is the temperature of the flue gas in the fourth flue 51. The temperature of the flue gas in each section of the steam unit is inversely proportional to the water temperature in each section of the steam unit, such as... Figure 4 As shown, the temperature gradient of water in each section of the steam unit is T5 < T6 < T7 < T8, where T5 is the external water temperature, T6 is the water temperature in condenser 5, T7 is the water temperature in water tank 4, and T8 is the water temperature in steam generator 1.

[0073] Example 2 Based on Example 1, Figure 5 As shown, the stove 21 is a regenerative flameless infrared radiation combustion type, and includes a stove body 211, a grate 212, and a heat storage body 213, wherein: Figure 5 As shown, the furnace body 211 is provided with an annular furnace cavity and a spiral guide channel, and a tangential air inlet is provided at the bottom of the guide channel; Figure 5 As shown, the grate 212 is located in the upper part of the furnace cavity and has several grate holes. A gas outlet pipe 214 is inserted into the grate hole, and a burner 215 is inserted into the gas outlet pipe 214. Figure 5 As shown, the heat storage body 213 is located above the grate plate 212 and has heat storage holes corresponding to the grate holes. The gas outlet pipe 214 and the burner nozzle 215 are inserted into the heat storage holes.

[0074] In this example, combustible gas enters the guide channel through the tangential inlet, generating a rotating flow and undergoing radial migration under the action of centrifugal force to achieve pressure equilibrium within the furnace cavity. After pressure equilibrium, the combustible gas enters the outlet pipe 214 through the grate and undergoes flameless combustion above the burner 215. The heat storage body 213 absorbs the combustion heat energy and converts it into infrared radiation energy. The heat energy is transferred to the steam generator 1 through three methods: heat conduction, heat convection, and heat radiation.

[0075] Example 3 Based on Example 1, Figure 2 As shown, the steam unit also includes a level gauge 15, a water supply pump 17, a control valve, an inlet pump 53, and a thermometer 42, wherein: Figure 2 As shown, the level gauge 15 is installed on the steam generator 1 to monitor the water level in the steam generator 1, and the water supply pump 17 is installed on the second pipeline 14 to supply water to the steam generator 1 according to the water level signal sent by the level gauge 15. The control valve is located on the first pipe 33 and is used to regulate the pressure and flow rate of saturated steam entering the steam superheater 3; Figure 2 As shown, the water inlet pump 53 is installed on the water inlet pipe 52 of the condenser 5 and is used to control the water inlet flow rate. Figure 1 As shown, thermometer 42 is installed on water tank 4 to monitor the water temperature inside water tank 4.

[0076] In this example, water tank 4 is a non-enclosed structure and has an overflow outlet. The water temperature inside water tank 4 is 90℃.

[0077] In the example, Figure 2 As shown, the water inlet pipe 52 is used to receive external water. The external water first enters the condenser 5 through the water inlet pipe 52, then enters the water tank 4 through the third pipe 41, and finally enters the cavity of the steam generator 1 through the second pipe 14.

[0078] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A low-NOx fuel gas steam generator capable of rapidly producing steam, characterized in that, The steam device includes a burner (2), a steam generator (1), a steam superheater (3), a water tank (4), and a condenser (5). The steam generator (1), the steam superheater (3), the water tank (4), and the condenser (5) are connected in sequence through a flue assembly to form a segmented heat exchange structure. The steam generator (1) contains a small amount of water in its cavity and is provided with a combustion chamber (11) and a first flue (12) communicating with the combustion chamber (11). The first flue (12) is provided with a turbulence structure. The burner (2) includes a stove (21) located below the combustion chamber (11). The stove (21) burns combustible gas and generates heat and flue gas. The heat is used to heat the water in the steam generator (1) to generate saturated steam. The saturated steam is superheated by the steam superheater (3) to form superheated steam. The superheated steam is output through the outlet (31). The steam superheater (3) is provided with a second flue (32). The steam superheater (3) is connected to the steam generator (1) through the first pipe (33). The water tank (4) is connected to the steam generator (1) through the second pipe (14) and to the condenser (5) through the third pipe (41); The flue gas flows sequentially through the first flue (12), the second flue (32), the third flue (43) below the water tank (4), and the fourth flue (51) inside the condenser (5), and exchanges heat with the water or steam in each section step by step.

2. The low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 1, characterized in that, The steam generator (1) is cylindrical, the combustion chamber (11) is located at the lower part of the steam generator (1), and there are multiple first flues (12) arranged in an array above the steam generator (1). The turbulence structure in the first flue (12) is a turbulence plate (13), and the turbulence plate (13) is a spiral structure. The flue gas enters the first flue (12) from the combustion chamber (11) located at the bottom of the steam generator (1) and spirals upward around the baffle (13). During the upward process, the flue gas exchanges heat with the water in the cavity.

3. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 2, characterized in that, The steam superheater (3) is located above the steam generator (1). A flue gas mixing zone is provided between the steam superheater (3) and the steam generator (1). The flue gas mixing zone is located at the bottom of the steam superheater (3) and the top of the steam generator (1).

4. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 1, characterized in that, The stove (21) is a regenerative flameless infrared radiation combustion type, and includes a stove body (211), a grate (212), and a heat storage body (213), wherein: The furnace body (211) is provided with an annular furnace cavity and a spiral guide channel, and the bottom of the guide channel is provided with a tangential air inlet; The grate (212) is located at the upper part of the furnace cavity and has several grate holes. A gas outlet pipe (214) is inserted into the grate hole, and a burner (215) is inserted into the gas outlet pipe (214). The heat storage body (213) is located above the grate (212) and has heat storage holes corresponding to the grate holes. The gas outlet pipe (214) and the burner (215) are inserted into the heat storage holes.

5. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 4, characterized in that, The combustible gas enters the guide channel through the tangential air inlet, generating a rotating flow and undergoing radial migration under the action of centrifugal force to achieve pressure equalization in the furnace cavity; after pressure equalization, the combustible gas enters the gas outlet pipe (214) through the grate and undergoes flameless combustion above the burner (215); the heat storage body (213) absorbs the combustion heat energy and converts it into infrared radiation energy; the heat energy is transferred to the steam generator (1) through three methods: heat conduction, heat convection and heat radiation.

6. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 1, characterized in that, The steam device also includes a level gauge (15), a water supply pump (17), a control valve, an inlet pump (53), and a thermometer (42), wherein: The level gauge (15) is installed on the steam generator (1) to monitor the water level in the steam generator (1), and the water replenishment pump (17) is installed on the second pipeline (14) to replenish water to the steam generator (1) according to the water level signal sent by the level gauge (15). The control valve is located on the first pipe (33) and is used to regulate the pressure and flow rate of the saturated steam entering the steam superheater (3); The water inlet pump (53) is installed on the water inlet pipe (52) of the condenser (5) and is used to control the water inlet volume; The thermometer (42) is installed on the water tank (4) and is used to monitor the water temperature in the water tank (4).

7. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 6, characterized in that, The water tank (4) is a non-enclosed structure and is equipped with an overflow port. The water temperature in the water tank (4) is not higher than 100℃.

8. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 6, characterized in that, The water inlet pipe (52) is used to receive external water. The external water first enters the condenser (5) through the water inlet pipe (52), then enters the water tank (4) through the third pipe (41), and finally enters the cavity of the steam generator (1) through the second pipe (14).

9. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 1, characterized in that, The flue gas and water flow are arranged in a countercurrent heat exchange configuration within the steam device. The temperature of the flue gas decreases gradually along its flow direction, while the temperature of the water flow increases gradually along its flow direction.

10. A low-NOx gas-fired steam generator capable of rapidly producing steam according to claim 8, characterized in that, The temperature gradient of the flue gas in each section of the steam device is T0 > T1 > T2 > T3 > T4, where T0 is the temperature of the flue gas in the combustion chamber (11), T1 is the temperature of the flue gas in the first flue (12), T2 is the temperature of the flue gas in the second flue (32), T3 is the temperature of the flue gas in the third flue (43), and T4 is the temperature of the flue gas in the fourth flue (51). The temperature of the flue gas in each section of the steam device is inversely proportional to the water temperature in each section of the steam device. The gradient change of the water temperature in each section of the steam device is T5 < T6 < T7 < T8, where T5 is the water temperature of the external water, T6 is the water temperature of the water in the condenser (5), T7 is the water temperature of the water in the water tank (4), and T8 is the water temperature of the water in the steam generator (1).

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