Low-nitrogen condensation hot water boiler

Abstract

The invention belongs to the field of hot water boilers, and particularly relates to a low-nitrogen condensation hot water boiler which comprises a combustion furnace pipe, an ignition table is fixedly connected to the position, close to the front end, of the interior of the combustion furnace pipe, and a front partition plate and a connecting plate are fixedly connected to the outer sides of the two ends of the combustion furnace pipe correspondingly. A plurality of second heat exchange pipes parallel to the combustion furnace pipe penetrate through the front partition plate and the connecting plate, the front end of the front partition plate is wrapped by a front smoke plate, the rear end of the connecting plate is connected with a smoke return box, and the outer side of the front partition plate and the outer side of the smoke return box are further wrapped by a heat preservation tank. Compared with the prior art, nitrides in waste gas are reduced, aftertreatment steps and cost required during waste gas emission are saved, impact force generated in the combustion process is effectively dispersed into a water body, the combustion furnace pipe is protected, meanwhile, the water body is effectively stirred, water body vaporizing is assisted, and the process of protecting equipment is achieved.

Description

Technical Field

[0001] This invention belongs to the field of hot water boilers, specifically a low-NOx condensing hot water boiler. Background Technology

[0002] A hot water boiler is a key piece of equipment that generates heat by burning fuel or electricity and transfers that heat to water to provide heating and domestic hot water.

[0003] The exhaust gas produced by boilers is a product of incomplete combustion of fuel and lack of purification. Nitrogen oxides are generated at high temperatures and are the main culprits in the formation of photochemical smog and acid rain. They also irritate the human respiratory tract. Therefore, the exhaust gas needs to be rendered harmless before it is discharged.

[0004] Traditional hot water boilers have relatively simple functions, often directly mixing fuel and air for combustion to vaporize water. However, the combustion process easily produces pollutants such as nitrogen oxides, requiring denitrification treatment during subsequent exhaust emissions. This not only increases operating costs but also wastes fuel heat due to the high-heat exhaust gases produced. Furthermore, the water in the boiler is relatively stagnant, which is not conducive to the long-term use of the boiler.

[0005] Therefore, the present invention provides a low-NOx condensing hot water boiler. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a low-NOx condensing hot water boiler, including a combustion furnace. An ignition platform is fixedly connected to the front end of the combustion furnace. A front partition and a connecting plate are fixedly connected to the outer sides of both ends of the combustion furnace. Multiple heat exchange tubes parallel to the combustion furnace are arranged through the front partition and the connecting plate. A front smoke plate is wrapped around the front end of the front partition. A return smoke box is connected to the rear end of the connecting plate. An insulation tank is also wrapped around the outer side of the front partition and the return smoke box. A flue gas filter for receiving tail flue gas is installed on the top of the insulation tank. A burner connected to the ignition platform is arranged at the front end of the insulation tank. A water supply pump is fixedly connected to the outer side of the insulation tank, and multiple steam valves are fixedly connected to the top of the insulation tank. Multiple absorption cylinders for absorbing combustion expansion energy are arranged on the outer side of the combustion furnace. A telescopic rod is slidably connected in the absorption cylinder. This setup not only achieves low-NOx treatment of the equipment, reducing nitrogen oxides in the exhaust gas and saving on post-treatment steps and costs required for exhaust emissions, but also effectively disperses the impact force generated during combustion into the water body. This not only protects the combustion furnace but also effectively agitates the water, assisting in water vaporization and protecting the equipment process.

[0008] Preferably, the ignition platform includes two sets of mixing nozzles arranged concentrically in a ring. The outer mixing nozzle has its spray end angled outward, while the inner mixing nozzle has its spray end angled towards the center. During operation, the two sets of mixing nozzles on the ignition platform are arranged so that the two ignition processes are alternately performed by the two sets of mixing nozzles. The outer mixing nozzle is used for slower spraying of high fuel and low combustion-supporting gas, while the middle mixing nozzle is used for high-speed spraying of high combustion-supporting gas and low fuel. This alternating operation not only makes operation more convenient and the delivery process simpler and smoother, but also gives both sets of mixing nozzles a breathing space, improving efficiency and extending service life.

[0009] Preferably, the combustion chamber consists of two connecting furnaces, each with a concave portion at both ends. Multiple absorption cylinders are equidistantly distributed in a ring around the outer side of the connecting furnace. During operation, due to the structure of the connecting furnace and the shape of the mixing nozzles, the first injected mixed fuel diffuses outward from the periphery of the connecting furnace, as does the resulting combustion gas. When moving to the end of the connecting furnace, the concave portion causes the gas to converge towards the center, generating an inward spiral gas flow. This allows the gas produced by the first combustion to remain in the first connecting furnace for a longer period. At this time, the second mixing nozzle in the center injects the mixed fuel at high speed and burns, colliding and mixing with the gas produced by the first combustion, ensuring effective mixing. Simultaneously, due to the high-speed impact, the fuel enters the second connecting furnace and remains there briefly, ensuring interaction and exhaustion of the combustible material. Furthermore, although the two connecting furnaces are integrally formed at the connection point, the presence of a concave portion allows for elastic deformation when the interior expands outward, causing the two furnaces to slightly separate and absorb energy, further ensuring the long service life of the combustion chamber.

[0010] Preferably, a rear partition is fixedly connected to the rear end of the heat exchange tank, and multiple heat exchange tubes are fixedly connected between the front partition and the rear partition. A rear smoke plate is fixedly connected to the rear end of the rear partition. During operation, by adding a new heat exchange tube, the exhaust gas enters the rear smoke plate after passing through a second heat exchange tube, and then flows back through the first heat exchange tube. The exhaust gas then undergoes a second heat exchange with the water through the first heat exchange tube, ensuring the effective utilization of heat.

[0011] Preferably, the flue gas heat filter is fixed to the top of the insulation tank, and a flue gas inlet pipe is fixed between the rear smoke plate and the flue gas heat filter. An air pipe for air intake is fixed to the outside of the flue gas heat filter, and a transmission pipe connected to the burner is also fixed to it. During operation, the flue gas heat filter can draw in outside air through the air pipe, mix it with some of the flue gas, and then transmit it to the burner through the transmission pipe, thereby completing the transfer of some flue gas and heating the air.

[0012] Preferably, the absorber is hollow inside, with its bottom located inside the connecting furnace. A pressure-sensitive element is fixed to the inner wall of the absorber. During operation, the absorber and the connecting furnace are integrally formed, reducing leakage issues. Since the absorber is hollow, even if a leak occurs, it will only enter the absorber and will not cause water pollution or leakage in the combustion chamber. The pressure-sensitive element can be triggered each time the telescopic rod extends or retracts, indicating normal fuel combustion and reducing combustion errors and excessive fuel filling. An internal sensor can also be installed to detect data such as humidity, enabling rapid detection of leaks. The absorber's seal can use the same sealing structure as hydraulic equipment, a mature technology with a low probability of leakage. Furthermore, the sliding of the telescopic rod is blocked by water, preventing leakage due to impact.

[0013] Preferably, a blocking ball is fixed to the bottom of the telescopic rod, and a wave block is fixed to the top of the telescopic rod. The wave block is arranged in a disc shape. During operation, the blocking ball is used to prevent the telescopic rod from coming off, and the wave block is used to improve the effect of disturbing the water.

[0014] Preferably, both heat exchange tube one and heat exchange tube two are fitted with rotatable circling plates on their outer sides. The hardness of the circling plates is lower than that of heat exchange tube one and heat exchange tube two. During operation, the circling plates on the surfaces of heat exchange tube one and heat exchange tube two will rub and rotate when the water fluctuates, effectively removing crystals and scale that precipitate during evaporation, which is a common problem in traditional boilers. The circling plates are also made of metal and are directly attached to heat exchange tube one and heat exchange tube two, without causing a reduction in heat transfer. At the same time, due to their lower hardness, they only rub and clean the scale without damaging heat exchange tube one and heat exchange tube two. The clean surfaces of heat exchange tube one and heat exchange tube two can effectively improve equipment efficiency, thereby saving fuel and extending service life. A drain valve is fixed to the bottom of the insulation tank for periodically emptying the water.

[0015] Preferably, the circling plate is composed of multiple semi-clamping rings, each semi-clamping ring being hollow inside. The multiple semi-clamping rings are arranged linearly and fixed end to end. An extension plate is fixed to the outer side of each semi-clamping ring, and the outer side of the extension plate has multiple slots. During operation, the structure of the circling plate ensures that heat exchange tubes one and two have sufficient contact surface with the water, and also effectively rubs their outer surfaces when rotating. At the same time, because the internal center is hollow, the circling plate will be in a horizontal equilibrium state under the action of buoyancy. It will only be driven to rotate when the water fluctuates, ensuring the cleaning effect. In order to increase the heat exchange plate's ability to receive the force of water fluctuations, the extension plate is also hollow inside, making it easy to return to a horizontal state.

[0016] Preferably, a thermostat is fixedly connected to the middle of the rear partition, the front smoke plate, and the rear smoke plate; a connecting valve is fixedly connected between the burner and the connecting valve; a control console is fixedly connected to the outside of the insulation tank; and a support base is fixedly connected to the bottom of the insulation tank. During operation, the thermostat can detect temperature, pressure, and other data in various areas inside the equipment to ensure normal operation. The control console can control various electronic devices. The connecting valve has two built-in passages that connect to two sets of mixing nozzles respectively.

[0017] The beneficial effects of this invention are as follows: 1. The low-NOx condensing hot water boiler of the present invention, through the setting of the combustion furnace, flue gas filter, changing the feeding method and absorption cylinder, not only achieves low-NOx treatment of the equipment and reduces nitrogen oxides in the exhaust gas, saving the post-treatment steps and costs required for exhaust gas emission, but also effectively disperses the impact force generated during the combustion process into the water body, which not only protects the combustion furnace, but also effectively agitates the water body, assists in water vaporization and protects the equipment process.

[0018] 2. The low-NOx condensing hot water boiler of the present invention, through the setting of the ignition platform and the connecting furnace, and through the structure of the connecting furnace and the shape of the mixing nozzle, the first injection of mixed fuel diffuses outward from the periphery of the connecting furnace, and the resulting combustion gas also diffuses outward. When it moves to the end of the connecting furnace, it moves towards the center due to the presence of the concave part. During the process of moving towards the center, an inward spiral gas is generated, which allows the gas generated by the first combustion to remain in the first connecting furnace for a longer time. At this time, the second mixing nozzle located in the middle injects mixed fuel at high speed and burns it, thereby colliding and mixing with the gas generated by the first combustion, ensuring the mixing effect of the two. At the same time, due to the high-speed impact, it enters the second connecting furnace and stays for a short time, ensuring that the two interact and consume the combustibles. Meanwhile, the two connecting furnaces are connected to each other, and although the connection is integrally formed, there is a concave part. When the inside expands outward, it can undergo elastic deformation, and the two connecting furnaces separate slightly, thereby absorbing energy and further ensuring the long service life of the combustion furnace. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the insulated container of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a perspective view of the front and rear partitions of the present invention; Figure 5 This is a perspective view of the combustion chamber of the present invention; Figure 6 This is a cross-sectional view of the combustion chamber of the present invention; Figure 7 This is a perspective view of the ignition platform of the present invention; Figure 8 This is a perspective view of the surrounding sheet of the present invention; In the diagram: 1. Insulation tank; 2. Rear smoke plate; 3. Front smoke plate; 4. Exhaust gas filter; 5. Steam valve; 6. Control console; 7. Water supply pump; 8. Burner; 9. Support base; 10. Connecting valve; 11. Front partition; 12. Air pipe; 13. Transmission pipe; 14. Smoke inlet pipe; 15. Rear partition; 16. Smoke return box; 17. Combustion furnace chamber; 18. Heat exchanger tube one; 19. Thermostat; 20. Connecting plate; 21. Heat exchanger tube two; 22. Absorption cylinder; 24. Ignition platform; 25. Connecting furnace; 26. Recessed part; 27. Telescopic rod; 28. Wave block; 30. Mixing nozzle; 32. Circulating plate; 33. Extension plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 8 As shown in the embodiment of the present invention, a low-NOx condensing hot water boiler includes a combustion chamber 17. An ignition platform 24 is fixedly connected to the front end of the combustion chamber 17. A front baffle 11 and a connecting plate 20 are fixedly connected to the outer sides of both ends of the combustion chamber 17, respectively. Multiple heat exchange tubes 21, parallel to the combustion chamber 17, are arranged through the front baffle 11 and the connecting plate 20. A front smoke plate 3 is wrapped around the front end of the front baffle 11. A return smoke box 16 is connected to the rear end of the connecting plate 20. The outer sides of the partition 11 and the return smoke box 16 are also covered with a heat preservation tank 1. The top of the heat preservation tank 1 is equipped with a flue gas filter 4 for receiving the tail flue gas. The front end of the heat preservation tank 1 is provided with a burner 8 connected to the ignition platform 24. A water supply pump 7 is fixedly connected to the outer side of the heat preservation tank 1, and multiple steam valves 5 are fixedly connected to the top of the heat preservation tank 1. Multiple absorption cylinders 22 for absorbing combustion expansion energy are provided on the outer side of the combustion furnace 17. A telescopic rod 27 is slidably connected in the absorption cylinder 22. The treated purified water is injected into the insulation tank 1 by the water supply pump 7. The insulation tank 1 is equipped with a water level gauge to maintain the liquid level. The burner 8 connects fuel and air. After mixing the two, the mixture is delivered to the ignition platform 24 for ignition and combustion. The combustion zone is in the combustion chamber 17. The high-temperature gas generated by ignition heats the combustion chamber 17. At the same time, the gas passes through the combustion chamber 17 and enters the return smoke box 16. Due to the continuous generation of new airflow, the airflow in front passes through the heat exchange tube 21. The heat exchange tube 21 and the combustion chamber 17 have a large contact area with the purified water, thereby vaporizing the water and forming steam. The steam is continuously discharged out through the steam valve 5 and used in other equipment. Finally, the remaining low-heat exhaust gas is discharged through the exhaust heat filter 4. To reduce nitrogen oxide emissions from combustion, the combustion temperature can be lowered. High temperatures break the strong chemical bonds in nitrogen molecules in the air, causing them to react with oxygen to form nitrogen oxides. Experimental data shows that nitrogen oxide production is low below 1350 degrees Celsius, but increases significantly above a certain threshold. By installing a flue gas filter 4, which first absorbs outside air and mixes it with the exhaust gas before feeding it into the burner 8, two benefits are achieved: preheating the air and reducing the oxygen content in the combustion gases. Preheated air, combined with the mixture of air and dye, makes the combustion gases more readily absorbed and mixed with the fuel. The ignition process is smoother, and the mixing of the two is more efficient, improving the mixing effect of the dye and the combustion-supporting gas. This ensures uniform combustion and reduces the problem of excessive combustion in some areas, resulting in a large amount of nitrogen oxides. Reducing the oxygen content directly lowers the combustion temperature, ensuring it does not exceed the preset temperature and further preventing the excessive generation of nitrogen oxides. Simultaneously, the feeding method of burner 8 is adjusted to intermittent secondary feeding, meaning it is periodically fed twice rapidly. The mixing ratio of fuel and combustion-supporting gas differs between the two feedings. The first feeding uses a fuel-to-gas ratio with more fuel and less gas, and the feeding is simultaneous. The initial combustion is slow, and due to a lack of oxidizer, combustion is incomplete, producing two batches of byproducts: carbon dioxide and water from partial combustion, and carbon monoxide, hydrogen, and hydrocarbon fragments from incomplete combustion. A second feeding then occurs, consisting of a small amount of fuel and a large amount of oxidizer gas, resulting in more complete combustion until all combustible fuel is exhausted. The combustion environment is now filled with the exhaust gases from the first combustion. The carbon monoxide produced earlier encounters sufficient oxygen and burns to produce carbon dioxide, while the hydrogen encounters sufficient oxygen and burns to produce water. The hydrocarbon fragments are completely oxidized, but due to the limited amount of fuel supplied, combustion... The temperature is difficult to exceed the preset temperature, so the second stage of combustion not only burns off the harmful gases, leaving only carbon dioxide and water, but also does not produce nitrogen oxides due to insufficient temperature. The first combustion, due to the lack of combustion-supporting gas, delays the most intense oxidation reactions that could produce high temperatures, such as the combustion of carbon monoxide and hydrogen, to the second stage. This cleverly avoids the peak of the flame temperature, thereby inhibiting the formation of nitrogen oxides and achieving the effect of low nitrogen generation and emission of the equipment. There is no need for the exhaust gas to undergo professional denitrification processes, reducing post-treatment costs. Moreover, the overall design process can be completed without the use of expensive equipment. To complete the aforementioned process, the combustion chamber 17 frequently undergoes ignition. The gas generated during ignition expands and compresses instantaneously, impacting the combustion chamber 17. To ensure the long service life of the combustion chamber 17, multiple absorber cylinders 22 are incorporated within it. During combustion, the resulting expansion force causes the telescopic rod 27 to quickly extend outwards. Through directional mechanical energy dissipation, the impact force on the combustion chamber 17 is dispersed. The other end of the telescopic rod 27 is submerged in pure water. As the rod 27 pushes, it creates ripples in the water, further dispersing the impact force. The rod 27 does not violently impact the absorber cylinders 22, thus preventing significant damage and ensuring a tight seal. Simultaneously, when the telescopic rod 27 extends outwards, the water pressure... Since both the absorption cylinder 22 and the combustion furnace 17 are hollow, the pressure is lower than the water pressure, which pushes the telescopic rod 27 back to its initial state for subsequent energy absorption, thus achieving an automatic return function. Furthermore, because the water inside the insulation tank 1 is constantly fluctuating, the agitation prevents impurities from settling and forming scale, reduces oxygen adhesion to the inner wall, and protects the furnace body. At the same time, it breaks down the hot water layer and cold water layer, allowing heat to be transferred evenly and quickly, saving fuel. Through this setting, not only is low-NOx treatment of the equipment achieved, reducing nitrogen oxides in the exhaust gas and saving the post-treatment steps and costs required for exhaust gas emissions, but the impact force generated during the combustion process is also effectively dispersed into the water body. This not only protects the combustion furnace 17 but also effectively agitates the water body, assisting in water vaporization and protecting the equipment process.

[0023] The ignition platform 24 includes two sets of mixing nozzles 30, which are arranged concentrically in a ring. The outer mixing nozzle 30 has its spray end tilted outward, while the inner mixing nozzle 30 has its spray end tilted towards the center. During operation, the ignition platform 24 is equipped with two sets of mixing nozzles 30, allowing the two ignition processes to be carried out alternately through the two sets of mixing nozzles 30. The outer mixing nozzle 30 is used for the slower spraying of high fuel and low combustion gas, while the middle mixing nozzle 30 is used for the high-speed spraying of high combustion gas and low fuel. This alternating operation not only makes operation more convenient and the delivery process simpler and smoother, but also gives both sets of mixing nozzles 30 a breathing time, improving efficiency and extending service life.

[0024] The combustion furnace 17 is composed of two connecting furnaces 25. Both ends of the connecting furnace 25 are provided with concave portions 26, and a plurality of absorption cylinders 22 are distributed equidistantly in a ring on the outside of the connecting furnace 25. During operation, due to the structure of the connecting furnace 25 and the shape of the mixing nozzle 30, the first injected mixed fuel diffuses outward from the periphery of the connecting furnace 25, and the resulting combustion gas also diffuses outward. When it moves to the end of the connecting furnace 25, it moves towards the center due to the presence of the concave portion 26. During this process, an inward spiral gas is generated, allowing the gas produced by the first combustion to remain in the first connecting furnace 25 for a longer period of time. At this time, the second mixing nozzle 30 located in the middle injects the mixed fuel at high speed and burns, thereby colliding and mixing with the gas produced by the first combustion, ensuring the mixing effect of the two. At the same time, due to the high-speed impact, it enters the second connecting furnace 25 and also stays for a short time, ensuring that the two interact and consume the combustibles. Meanwhile, the two connecting furnaces 25 are connected to each other, and although the connection is integrally formed, there is a concave portion 26. When the inside expands outward, it can undergo elastic deformation, and the two connecting furnaces 25 separate slightly, thereby absorbing energy and further ensuring the long service life of the combustion furnace 17.

[0025] The rear end of the heat preservation tank 1 is fixedly connected to a rear partition plate 15, and a plurality of heat exchange tubes 18 are fixedly connected through the front partition plate 11 and the rear partition plate 15. The rear end of the rear partition plate 15 is fixedly connected to a rear smoke plate 2. During operation, by adding a new heat exchange tube 18, the exhaust gas enters the rear smoke plate 2 after passing through the heat exchange tube 21, and then flows back through the heat exchange tube 18. The exhaust gas then undergoes a second heat exchange with the water through the heat exchange tube 18, ensuring the effective utilization of heat.

[0026] The exhaust heat filter 4 is fixedly connected to the top of the heat preservation tank 1. An inlet pipe 14 is fixedly connected between the rear smoke plate 2 and the exhaust heat filter 4. An air pipe 12 for air intake is fixedly connected to the outside of the exhaust heat filter 4. A transmission pipe 13 connected to the burner 8 is also fixedly connected. During operation, the flue gas filter 4 can draw in outside air through the air pipe 12, mix it with some of the flue gas, and then transfer it to the burner 8 through the transmission pipe 13, thereby completing the transfer of some of the flue gas and heating the air.

[0027] The absorber 22 is hollow inside, and the bottom of the absorber 22 is located inside the connecting furnace 25. A pressure-sensitive element is fixed to the inner wall of the absorber 22. During operation, the absorption cylinder 22 is integrally formed with the connecting furnace 25, reducing leakage problems. The absorption cylinder 22 is hollow inside, so even if a leak occurs, it will only enter the absorption cylinder 22 and will not cause water pollution or water leakage in the combustion chamber 17. The pressure-sensitive element can be triggered each time the telescopic rod 27 extends or retracts, thus indicating that the fuel is burning normally and reducing combustion errors and excessive fuel filling. Sensors can also be installed inside to sense data such as humidity, which can quickly detect leaks. The sealing of the absorption cylinder 22 can adopt the same sealing structure as hydraulic equipment, which is technically mature and has a low possibility of leakage. Furthermore, the sliding of the telescopic rod 27 is blocked by water, so it will not leak due to impact.

[0028] A blocking ball is fixed to the bottom of the telescopic rod 27, and a wave block 28 is fixed to the top of the telescopic rod 27. The wave block 28 is arranged in a disc shape. During operation, the blocking ball is used to prevent the telescopic rod 27 from coming off, and the undulating block 28 is used to improve the effect of disturbing the water.

[0029] The outer sides of heat exchange tube 18 and heat exchange tube 21 are each fitted with a rotatable circumferential plate 32, and the hardness of the circumferential plate 32 is lower than that of heat exchange tube 18 and heat exchange tube 21. During operation, the surrounding plates 32 on the surfaces of heat exchange tube 18 and heat exchange tube 21 will rub and circulate as the water fluctuates, effectively removing crystals and scale that precipitate during evaporation, a common problem in traditional boilers. The surrounding plates 32 are also made of metal and directly adhere to heat exchange tubes 18 and 21 without reducing heat transfer. Furthermore, due to their low hardness, they only rub and clean scale without damaging heat exchange tubes 18 and 21. The clean surfaces of heat exchange tubes 18 and 21 effectively improve equipment efficiency, saving fuel and extending service life. A drain valve is fixed to the bottom of the insulation tank 1 for periodically emptying the water.

[0030] The surrounding piece 32 is composed of multiple half-rings, the interior of which is hollow. The multiple half-rings are arranged linearly and fixed end to end. An extension plate 33 is fixed to the outside of the half-rings, and multiple slots are opened on the outside of the extension plate 33. During operation, the structure of the surrounding plate 32 ensures that the heat exchange tubes 18 and 21 have sufficient contact surface with the water, and also effectively rubs against their outer surfaces when rotating. At the same time, because the internal center is hollow, the surrounding plate 32 will be in a horizontal equilibrium state under the action of buoyancy. It will only be driven to rotate when the water fluctuates, ensuring the cleaning effect. In order to increase the heat exchange plate 32's ability to receive the force of water fluctuations, the extension plate 33 is also hollow inside, making it easy to return to a horizontal state.

[0031] Thermostats 19 are fixedly connected to the middle of the rear partition 15, the front smoke plate 3 and the rear smoke plate 2. A connecting valve 10 is fixedly connected between the burner 8 and the connecting valve 10. A control console 6 is fixedly connected to the outside of the heat preservation tank 1. A support base 9 is also fixedly connected to the bottom of the heat preservation tank 1. During operation, the temperature controller 19 can detect temperature, pressure and other data in various areas inside the equipment to ensure normal operation. The control console 6 can control various electronic devices. The connecting valve 10 has two built-in passages that connect to two sets of mixing nozzles 30 respectively.

[0032] During operation, by setting up the exhaust heat filter 4, the exhaust heat filter 4 first absorbs outside air and mixes it with the exhaust gas before feeding it into the burner 8. This provides two benefits: preheating the air and reducing the oxygen content in the combustion gas. Preheated air, mixed with the dye, is not only easier to ignite, but the mixing process is also smoother, improving the mixing effect of the dye and combustion gas. This ensures uniform combustion and reduces the problem of excessive combustion in some areas, resulting in large amounts of nitrogen oxides. Reducing the oxygen content directly lowers the combustion temperature, ensuring it does not exceed the preset temperature, further preventing the large-scale production of nitrogen oxides. Simultaneously, the feeding method of the burner 8 is adjusted to intermittent secondary feeding, i.e., periodically and rapidly fed twice. The mixing of fuel and combustion gas differs between the two feedings. The first feeding uses a fuel-to-gas ratio with more fuel and less gas, and the feeding speed is slower. Due to the lack of combustion aids, combustion is incomplete, producing two batches of products: one batch consists of partially combusted carbon dioxide and water, and the other... The first stage of combustion produces carbon monoxide, hydrogen, and hydrocarbon fragments from incomplete combustion. A second feeding process then begins, consisting of a small amount of fuel and a large amount of combustion-supporting gas, ensuring complete combustion until all combustible fuel is exhausted. The combustion environment is filled with the exhaust gas from the first combustion. The carbon monoxide from the first combustion encounters sufficient oxygen and burns to produce carbon dioxide, while the hydrogen encounters sufficient oxygen and burns to produce water. The hydrocarbon fragments are completely oxidized. However, due to the smaller amount of fuel, the combustion temperature is difficult to exceed the preset temperature. Therefore, the second stage of combustion not only burns away harmful gases, leaving only carbon dioxide and water, but also, due to the insufficient temperature, does not produce nitrogen oxides. The first combustion, lacking combustion-supporting gas, delays the most intense oxidation reactions, such as the combustion of carbon monoxide and hydrogen, to the second stage. This cleverly avoids the peak flame temperature, thus suppressing nitrogen oxide formation and achieving low nitrogen generation and emissions. It eliminates the need for specialized denitrification processes, reducing post-treatment costs. Furthermore, the overall design and process can be completed without expensive equipment.

[0033] To complete the aforementioned process, the combustion chamber 17 frequently undergoes ignition. The gas generated during ignition expands and compresses instantaneously, impacting the combustion chamber 17. To ensure the long service life of the combustion chamber 17, multiple absorber cylinders 22 are incorporated within it. During combustion, the resulting expansion force causes the telescopic rod 27 to quickly extend outwards. Through directional mechanical energy dissipation, the impact force on the combustion chamber 17 is dispersed. The other end of the telescopic rod 27 is submerged in pure water. As the rod 27 pushes, it creates ripples in the water, further dispersing the impact force. The rod 27 does not violently impact the absorber cylinders 22, thus preventing significant damage and ensuring a tight seal. Simultaneously, when the telescopic rod 27 extends outwards, the water pressure... Since both the absorption cylinder 22 and the combustion furnace 17 are hollow, the pressure is lower than the water pressure, which pushes the telescopic rod 27 back to its initial state for subsequent energy absorption, thus achieving an automatic return function. Furthermore, because the water inside the insulation tank 1 is constantly fluctuating, the agitation prevents impurities from settling and forming scale, reduces oxygen adhesion to the inner wall, and protects the furnace body. At the same time, it breaks down the hot water layer and cold water layer, allowing heat to be transferred evenly and quickly, saving fuel. Through this setting, not only is low-NOx treatment of the equipment achieved, reducing nitrogen oxides in the exhaust gas and saving the post-treatment steps and costs required for exhaust gas emissions, but the impact force generated during the combustion process is also effectively dispersed into the water body. This not only protects the combustion furnace 17 but also effectively agitates the water body, assisting in water vaporization and protecting the equipment process.

[0034] The ignition platform 24 is equipped with two sets of mixing nozzles 30, which allow the two ignition processes to be carried out alternately through the two sets of mixing nozzles 30. The outer mixing nozzle 30 is used for the slower spraying of high fuel and low combustion gas, while the middle mixing nozzle 30 is used for the high-speed spraying of high combustion gas and low fuel. The alternating operation not only makes the operation more convenient and the delivery process simpler and smoother, but also gives both sets of mixing nozzles 30 a breathing time, which improves efficiency and extends service life.

[0035] Through the structure of the connecting furnace 25 and the shape of the mixing nozzle 30, the first injected mixed fuel diffuses outward from the periphery of the connecting furnace 25, and the resulting combustion gas also diffuses outward. When it moves to the end of the connecting furnace 25, it moves towards the center due to the presence of the concave portion 26. During this process, an inward spiral gas is generated, allowing the gas produced by the first combustion to remain in the first connecting furnace 25 for a longer period of time. At this time, the second mixing nozzle 30 located in the middle injects the mixed fuel at high speed and burns, thereby colliding and mixing with the gas produced by the first combustion, ensuring the mixing effect of the two. At the same time, due to the high-speed impact, it enters the second connecting furnace 25 and also stays for a short time, ensuring that the two interact and consume the combustibles. Meanwhile, the two connecting furnaces 25 are connected to each other, and although the connection is integrally formed, there is a concave portion 26. When the inside expands outward, it can undergo elastic deformation, and the two connecting furnaces 25 separate slightly, thereby absorbing energy and further ensuring the long service life of the combustion furnace 17.

[0036] By adding a new heat exchange tube 18, the exhaust gas enters the rear smoke plate 2 after passing through the heat exchange tube 21, and then flows back through the heat exchange tube 18. The exhaust gas then undergoes a second heat exchange with the water through the heat exchange tube 18, ensuring the effective utilization of heat.

[0037] The flue gas filter 4 can draw in outside air through the air pipe 12, mix it with some of the flue gas, and then transfer it to the burner 8 through the transmission pipe 13, thereby completing the transfer of some of the flue gas and heating the air.

[0038] The absorption cylinder 22 is integrally formed with the connecting furnace 25, reducing leakage problems. The absorption cylinder 22 is hollow inside, so even if a leak occurs, it will only enter the absorption cylinder 22 and will not cause water pollution or water leakage in the combustion chamber 17. The pressure-sensitive element can be triggered every time the telescopic rod 27 extends or retracts, thus indicating that the fuel is burning normally and reducing combustion errors and excessive fuel filling. It can also be equipped with internal sensors to sense data such as humidity, which can quickly detect leaks. The sealing of the absorption cylinder 22 can adopt the same sealing structure as hydraulic equipment, which is technically mature and has a low possibility of leakage. Furthermore, the sliding of the telescopic rod 27 is blocked by water, so it will not leak due to impact.

[0039] The blocking ball is used to prevent the telescopic rod 27 from coming off, and the undulating block 28 is used to improve the effect of disturbing the water.

[0040] The surrounding plates 32 on the surfaces of heat exchange tube 18 and heat exchange tube 21 will rub and circulate when the water fluctuates, effectively removing crystals and scale that precipitate during evaporation, which is a common problem in traditional boilers. The surrounding plates 32 are also metal and are directly attached to heat exchange tube 18 and heat exchange tube 21 without causing a reduction in heat transfer. At the same time, due to their low hardness, they will only rub and clean the scale without damaging heat exchange tube 18 and heat exchange tube 21. The clean surfaces of heat exchange tube 18 and heat exchange tube 21 can effectively improve equipment efficiency, thereby saving fuel and extending service life. A drain valve is fixed to the bottom of the insulation tank 1 for periodically emptying the water.

[0041] The structure of the surrounding plate 32 ensures that the heat exchange tubes 18 and 21 have sufficient contact surface with the water, and also effectively rubs against their outer surfaces when rotating. At the same time, because the internal center is hollow, the surrounding plate 32 will be in a horizontal equilibrium state under the action of buoyancy. It will only be driven to rotate when the water fluctuates, ensuring the cleaning effect. In order to increase the heat exchange plate 32's ability to receive the force of water fluctuations, the extension plate 33 is also hollow inside, making it easy to return to a horizontal state.

[0042] The temperature controller 19 can detect temperature, pressure and other data in various areas inside the equipment to ensure normal operation of the equipment. The control console 6 can control various electronic devices. The connecting valve 10 has two built-in passages, which are respectively connected to two sets of mixing nozzles 30.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-NOx condensing hot water boiler, characterized in that: The device includes a combustion chamber, with an ignition platform fixedly connected to its front end. Front partitions and connecting plates are fixedly connected to the outer sides of both ends of the combustion chamber. Multiple heat exchange tubes parallel to the combustion chamber are installed through the front partitions and connecting plates. A front smoke plate covers the front end of the front partition, and a return smoke box is connected to the rear end of the connecting plate. An insulation tank covers the outer sides of the front partition and return smoke box. A flue gas filter for receiving tail gas is installed on the top of the insulation tank. A burner connected to the ignition platform is located at the front end of the insulation tank. A water pump is fixedly connected to the outer side of the insulation tank, and multiple steam valves are fixedly connected to the top of the insulation tank. Multiple absorption cylinders for absorbing combustion expansion energy are installed on the outer side of the combustion chamber, and telescopic rods are slidably connected within the absorption cylinders.

2. The low-NOx condensing hot water boiler according to claim 1, characterized in that: The ignition platform includes two sets of mixing nozzles, which are arranged concentrically in a ring. The outer mixing nozzle has its spray end tilted outward, while the inner mixing nozzle has its spray end tilted towards the center.

3. A low-NOx condensing hot water boiler according to claim 2, characterized in that: The combustion furnace consists of two connecting furnaces, both ends of which are provided with concave portions, and multiple absorption cylinders are distributed equidistantly in a ring on the outer side of the connecting furnaces.

4. A low-NOx condensing hot water boiler according to claim 3, characterized in that: A rear partition is fixedly connected to the rear end of the heat preservation tank, and a plurality of heat exchange tubes are fixedly connected through the front partition and the rear partition. A rear smoke plate is fixedly connected to the rear end of the rear partition.

5. A low-NOx condensing hot water boiler according to claim 4, characterized in that: The exhaust heat filter is fixed to the top of the insulation tank. An inlet pipe is fixed between the rear smoke plate and the exhaust heat filter. An air pipe for air intake is fixed to the outside of the exhaust heat filter, and a transmission pipe connected to the burner is also fixed to it.

6. A low-NOx condensing hot water boiler according to claim 5, characterized in that: The absorber is hollow inside, with its bottom located inside the connecting furnace, and a pressure-sensitive element fixed to its inner wall.

7. A low-NOx condensing hot water boiler according to claim 6, characterized in that: A blocking ball is fixed to the bottom of the telescopic rod, and a wave block is fixed to the top of the telescopic rod. The wave block is arranged in a disc shape.

8. A low-NOx condensing hot water boiler according to claim 7, characterized in that: Both heat exchange tube one and heat exchange tube two are fitted with rotating circling plates on their outer sides. The hardness of the circling plates is lower than that of heat exchange tube one and heat exchange tube two.

9. A low-NOx condensing hot water boiler according to claim 8, characterized in that: The surrounding piece is composed of multiple semi-locking rings, each of which is hollow inside. The multiple semi-locking rings are arranged linearly and fixed end to end. An extension plate is fixed to the outside of each semi-locking ring, and multiple grooves are formed on the outside of the extension plate.

10. A low-NOx condensing hot water boiler according to claim 9, characterized in that: A thermostat is fixedly connected to the middle of the rear partition, the front smoke plate and the rear smoke plate. A connecting valve is fixedly connected between the burner and the connecting valve. A control console is fixedly connected to the outside of the heat preservation tank. A support base is also fixedly connected to the bottom of the heat preservation tank.

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