Low-nitrogen oxide combustion chamber structure of gas-fired boiler

Abstract

The utility model relates to the technical field of gas-fired boilers, in particular to a low-nitrogen oxide combustion chamber structure of a gas-fired boiler, which comprises a combustion box, the inside of the combustion box is divided into a combustion cavity, a smoke channel and a fluid channel through partition plates and U-shaped hollow plates, and a plurality of inner heat exchange fins which are distributed at equal intervals are arranged on the inner wall of the combustion cavity. A plurality of outer heat exchange fins distributed at equal intervals are arranged on the outer wall of the combustion cavity, a mixed combustor is arranged in the middle of the left side of the combustion box in a penetrating mode, the output end of the mixed combustor is located at the left end of the interior of the combustion cavity, an air input pipe and a fuel gas input pipe are arranged on the mixed combustor, and a first preheating sleeve is arranged on the outer side of the air input pipe; and a second preheating sleeve is arranged on the outer side of the fuel gas input pipe. According to the low-nitrogen-oxide combustion chamber structure of the gas-fired boiler, temperature distribution of the combustion cavity is optimized, local high temperature of the inner wall is avoided, and therefore generation of nitrogen oxide in a high-temperature area is reduced. Therefore, environmental pollution can be reduced, and stricter requirements of environmental protection laws and regulations are met.

Description

Technical Field

[0001] The utility model relates to the technical field of gas boilers, in particular to a low nitrogen oxide combustion chamber structure of a gas boiler. Background Art

[0002] In the existing gas boiler design, the generation of nitrogen oxides mainly comes from the high-temperature combustion of fuel. Especially in the combustion chamber of a traditional gas boiler, when natural gas reacts with oxygen at high temperatures, a large amount of nitrogen oxides will inevitably be produced. These nitrogen oxides not only have a significant impact on the environment, but also increase the cost of environmental governance and emission compliance for enterprises.

[0003] The patent with publication number CN107036084B discloses a gas boiler, which includes a mixer, a first combustion chamber and a second combustion chamber, etc. The gas includes a first part of gas and a second part of gas, wherein the first part of gas is mixed with an auxiliary gas in the mixer and then enters the first combustion chamber for a primary combustion, i.e. lean premixed combustion, to form a second mixed gas, the second mixed gas has a low residual oxygen, and enters the second combustion chamber after losing part of the heat in the first combustion chamber. The second mixed gas is mixed with the second part of gas entering through the second gas pipeline in the second combustion chamber as an auxiliary gas and undergoes secondary combustion, i.e. low oxygen concentration supplementary combustion, to form flue gas with even lower residual oxygen. The gas boiler of the present invention couples lean premixed combustion with low oxygen concentration supplementary combustion, and separates the areas where the two combustions occur, further reducing the emission of nitrogen oxides, and the residual oxygen concentration in the flue gas is even lower, thereby improving the thermal efficiency of the boiler.

[0004] Although the above-mentioned existing technologies have made some progress in reducing NOx emissions, there are still some limitations in actual operation. For example, the technology relies on complex gas flow and control systems, which may increase the mechanical complexity and maintenance costs of the system. In addition, the multi-stage combustion process may lead to unstable combustion efficiency, especially under variable load conditions, which may affect the overall performance and reliability of the boiler. In view of this, we propose a low nitrogen oxide combustion chamber structure for gas boilers. Utility Model Content

[0005] The utility model aims to provide a low nitrogen oxide combustion chamber structure of a gas boiler to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The low nitrogen oxide combustion chamber structure of a gas boiler includes a combustion box, wherein a partition and a U-shaped hollow plate are arranged in the combustion box, wherein the combustion box and the partition form a fluid channel for the fluid to be heated to pass through, wherein the combustion box, the partition and the U-shaped hollow plate form a combustion chamber and a flue gas channel, wherein the flue gas channel is connected to the combustion chamber, wherein the combustion chamber is used for the mixed combustion of fuel and air, wherein the flue gas generated by the combustion is led out through the flue gas channel, wherein the fluid channel covers the combustion chamber and the flue gas channel, and performs heat exchange between the combustion chamber and the flue gas channel, thereby heating the fluid in the fluid channel. The inner wall of the combustion chamber is provided with a plurality of equidistantly arranged inner heat exchange fins, and the outer wall of the combustion chamber is provided with a plurality of equidistantly arranged outer heat exchange fins. Under the action of the inner heat exchange fins and the outer heat exchange fins, the inner heat exchange fins can increase the inner wall area of ​​the combustion chamber and improve the heat extraction generated by the fuel combustion. The outer heat exchange fins can increase the outer wall area of ​​the combustion chamber and improve the heating efficiency of the fluid in the fluid channel. At the same time, it can avoid the generation of partial high temperature on the inner wall of the combustion chamber, thereby optimizing the temperature distribution during the combustion process, and further reducing the generation of nitrogen oxides in the high temperature area.

[0008] A mixing burner is provided through the middle of the left side of the combustion box, and the output end of the mixing burner is located at the left end of the combustion chamber. An air input pipe and a gas input pipe are provided on the mixing burner. A first preheating sleeve is provided on the outer side of the air input pipe for preheating the air in the air input pipe, and a second preheating sleeve is provided on the outer side of the gas input pipe for preheating the gas in the gas input pipe, which is beneficial for the air and gas to burn quickly and fully after entering the combustion chamber. A smoke outlet pipe connected to the smoke channel is provided in the middle of the right side of the combustion box, and the smoke outlet pipe is externally connected to an induced draft device, and the smoke is introduced into the chimney through the induced draft device.

[0009] Preferably, a heat preservation layer and a thermal insulation layer are provided between the inner wall and the outer wall of the combustion box, and the thermal insulation layer is located on the inner side of the heat preservation layer to reduce the influence of the external temperature on the internal temperature of the combustion box.

[0010] Preferably, the bottom of the combustion box is provided with two supporting feet which are symmetrically arranged on the left and right sides to support the combustion box.

[0011] Preferably, a fluid input pipe connected to the fluid channel is provided at the bottom end of the right side of the combustion box, and a fluid output pipe connected to the fluid channel is provided at the top end of the right side of the combustion box. The fluid to be heated is input into the fluid channel from the fluid input pipe, and the heated fluid is output from the fluid output pipe.

[0012] Preferably, a first liquid guide tube is provided on the left side of the U-shaped hollow plate and near the top, and one end of the first liquid guide tube away from the U-shaped hollow plate passes through the inner side of the partition and the combustion box in sequence and is connected to the first preheating sleeve.

[0013] Preferably, a second liquid guide tube is provided on the left side of the U-shaped hollow plate and near the bottom, and one end of the second liquid guide tube away from the U-shaped hollow plate passes through the inner side of the partition and the combustion box in sequence and is connected to the second preheating sleeve.

[0014] Preferably, the U-shaped hollow plate, the first liquid guiding tube, the second liquid guiding tube, the first preheating sleeve and the second preheating sleeve are filled with a heat-conducting solution. The heat-conducting solution in the U-shaped hollow plate exchanges heat with the flue gas channel, so that the heat-conducting solution is heated. The heated heat-conducting solution can heat the air input pipe covered by the first preheating sleeve, and the heated heat-conducting solution can heat the gas input pipe covered by the second preheating sleeve, thereby realizing preheating treatment of air and gas.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The low nitrogen oxide combustion chamber structure of the gas boiler is provided with multiple equidistantly arranged inner and outer heat exchange fins on the inner and outer walls of the combustion chamber. This design not only improves the transfer efficiency of the heat generated by combustion, but also increases the heating efficiency of the fluid in the fluid channel. This optimized heat exchange design significantly improves the thermal efficiency of the boiler.

[0017] 2. The low nitrogen oxide combustion chamber structure of the gas boiler optimizes the temperature distribution of the combustion chamber, avoiding local high temperature on the inner wall, thereby reducing the generation of nitrogen oxides in the high temperature area. This helps reduce environmental pollution and meets more stringent environmental regulations.

[0018] 3. The low NOx combustion chamber structure of the gas boiler preheats the air and gas so that they are heated before entering the combustion chamber, allowing for faster and more complete combustion. This preheating process reduces energy loss and improves the overall efficiency of combustion.

[0019] 4. The low nitrogen oxide combustion chamber structure of the gas boiler simplifies the traditional multi-stage combustion process, reduces the mechanical complexity of the system and the maintenance cost caused by the complex system. At the same time, the application of insulation and heat insulation layers reduces the impact of external temperature on the combustion process and improves the durability and reliability of the overall equipment.

[0020] 5. The low nitrogen oxide combustion chamber structure of the gas boiler reduces the emission of harmful gases during the combustion process through efficient heat exchange and optimized combustion control, and the negative impact on the environment is also reduced accordingly, which is conducive to enterprises meeting increasingly stringent environmental protection standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 For this utility model Figure 1 A schematic diagram of the structure enlargement at the center A;

[0023] Figure 3 It is a partial structural schematic diagram of the utility model.

[0024] In the figure: 1. combustion box; 10. partition; 11. combustion chamber; 12. fluid channel; 13. inner heat exchange fin; 14. outer heat exchange fin; 15. smoke outlet pipe; 16. support leg; 17. smoke channel; 2. mixing burner; 20. air input pipe; 21. gas input pipe; 3. fluid input pipe; 4. fluid output pipe; 5. U-shaped hollow plate; 50. first liquid guide pipe; 51. second liquid guide pipe; 6. first preheating sleeve; 7. second preheating sleeve; 8. heat transfer solution. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] See also Figure 1-Figure 3 , the utility model provides a technical solution:

[0028] The low nitrogen oxide combustion chamber structure of the gas boiler includes a combustion box 1, a baffle 10 and a U-shaped hollow plate 5 are arranged in the combustion box 1, the combustion box 1 and the baffle 10 form a fluid channel 12 for the fluid to be heated to pass through, the combustion box 1, the baffle 10 and the U-shaped hollow plate 5 form a combustion chamber 11 and a flue gas channel 17, the flue gas channel 17 is connected to the combustion chamber 11, the combustion chamber 11 is used for mixed combustion of fuel and air, the flue gas channel 17 guides the flue gas generated by the combustion, the fluid channel 12 covers the combustion chamber 11 and the flue gas channel 17, and heats the combustion chamber 11 and the flue gas channel 17, thereby heating the fluid channel 12. Fluid, the inner wall of the combustion chamber 11 is provided with a plurality of equidistantly arranged inner heat exchange fins 13, and the outer wall of the combustion chamber 11 is provided with a plurality of equidistantly arranged outer heat exchange fins 14. Under the action of the inner heat exchange fins 13 and the outer heat exchange fins 14, the inner heat exchange fins 13 can increase the inner wall area of ​​the combustion chamber 11 and improve the heat extraction generated by the fuel combustion. The outer heat exchange fins 14 can increase the outer wall area of ​​the combustion chamber 11 and improve the heating efficiency of the fluid in the fluid channel 12. At the same time, it can avoid the inner wall of the combustion chamber 11 from generating partial high temperature, thereby optimizing the temperature distribution during the combustion process, and further reducing the generation of nitrogen oxides in the high temperature area;

[0029] A mixing burner 2 is provided through the middle of the left side of the combustion box 1, and the output end of the mixing burner 2 is located at the left end of the combustion chamber 11. An air input pipe 20 and a gas input pipe 21 are provided on the mixing burner 2. A first preheating sleeve 6 is provided on the outer side of the air input pipe 20 for preheating the air in the air input pipe 20, and a second preheating sleeve 7 is provided on the outer side of the gas input pipe 21 for preheating the gas in the gas input pipe 21, which is beneficial for the air and gas to quickly and fully burn after entering the combustion chamber 11. A smoke outlet pipe 15 connected to the smoke channel 17 is provided in the middle of the right side of the combustion box 1. The smoke outlet pipe 15 is externally connected to an induced draft device, and the smoke is introduced into the chimney through the induced draft device.

[0030] In this embodiment, a heat preservation layer and a thermal insulation layer are provided between the inner wall and the outer wall of the combustion box 1 , and the thermal insulation layer is located on the inner side of the heat preservation layer to reduce the influence of the external temperature on the internal temperature of the combustion box 1 .

[0031] Specifically, two supporting legs 16 symmetrically arranged at the bottom of the combustion box 1 are provided to support the combustion box 1 .

[0032] Furthermore, a fluid input pipe 3 connected to the fluid channel 12 is provided at the bottom end of the right side of the combustion box 1, and a fluid output pipe 4 connected to the fluid channel 12 is provided at the top end of the right side of the combustion box 1. The fluid to be heated is input into the fluid channel 12 from the fluid input pipe 3, and the heated fluid is output from the fluid output pipe 4.

[0033] Furthermore, a first liquid conduit 50 is provided on the left side and near the top of the U-shaped hollow plate 5. One end of the first liquid conduit 50 away from the U-shaped hollow plate 5 passes through the inner side of the partition 10 and the combustion box 1 in sequence and is connected to the first preheating sleeve 6.

[0034] Furthermore, a second liquid guide tube 51 is provided on the left side of the U-shaped hollow plate 5 and near the bottom. One end of the second liquid guide tube 51 away from the U-shaped hollow plate 5 passes through the inner side of the partition 10 and the combustion box 1 in sequence and is connected to the second preheating sleeve 7.

[0035] Furthermore, the U-shaped hollow plate 5, the first liquid guide tube 50, the second liquid guide tube 51, the first preheating sleeve 6 and the second preheating sleeve 7 are filled with a heat-conducting solution 8. The heat-conducting solution 8 in the U-shaped hollow plate 5 exchanges heat with the flue gas channel 17, so that the heat-conducting solution 8 is heated. The heated heat-conducting solution 8 can heat the air input pipe 20 covered by the first preheating sleeve 6, and the heated heat-conducting solution 8 can heat the gas input pipe 21 covered by the second preheating sleeve 7, thereby realizing preheating treatment of air and gas.

[0036] When the low nitrogen oxide combustion chamber structure of the gas boiler of this embodiment is in use, the preheated air and gas are fully mixed in the mixing burner 2 and then transported to the combustion chamber 11 for combustion. The mixing burner 2 ensures the uniform distribution of the mixed gas to promote effective combustion and reduce the risk of incomplete combustion. The inner heat exchange fins 13 equipped on the inner wall of the combustion chamber 11 help to increase the inner wall area and accelerate the heat transfer. At the same time, the outer heat exchange fins 14 increase the outer wall area and improve the heating efficiency of the fluid in the fluid channel 12. The high-temperature flue gas generated by combustion contacts the U-shaped hollow plate 5 when passing through the flue gas channel 17, and heat is exchanged through the heat-conducting solution 8. The heat in the flue gas is recovered and used for preheating entering the combustion chamber. The air and gas are effectively utilized, and the waste heat of the flue gas is used to increase the intake temperature, thereby enhancing the combustion efficiency. At the same time, the fluid channel 12 surrounds the combustion chamber 11 and the flue gas channel 17, and the fluid to be heated is heated through the fluid channel 12. In this process, the design of the internal and external heat exchange fins enables the fluid to absorb heat efficiently, and the temperature distribution of the combustion chamber 11 is optimized, thereby avoiding local high temperature on the inner wall, thereby reducing the generation of nitrogen oxides in the high-temperature area. The low-nitrogen oxide combustion chamber structure of the gas boiler can not only efficiently utilize fuel to generate thermal energy, but also significantly improve energy utilization through optimized heat exchange design and preheating mechanism, while reducing nitrogen oxide emissions to meet environmental protection requirements.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A low nitrogen oxide combustion chamber structure for a gas boiler, comprising a combustion box (1), characterized in that: The combustion box (1) is provided with a partition (10) and a U-shaped hollow plate (5), the combustion box (1) and the partition (10) enclose a fluid channel (12), the combustion box (1), the partition (10) and the U-shaped hollow plate (5) enclose a combustion chamber (11) and a smoke channel (17), the smoke channel (17) and the combustion chamber (11) are connected, the fluid channel (12) covers the combustion chamber (11) and the smoke channel (17), the inner wall of the combustion chamber (11) is provided with a plurality of internal heat exchange fins (13) arranged at equal distances, and the outer wall of the combustion chamber (11) is provided with a plurality of internal heat exchange fins (13) arranged at equal distances. The combustion box (1) is provided with a mixing burner (2) extending through the middle of the left side of the combustion box (1); the output end of the mixing burner (2) is located at the left end of the combustion chamber (11); the mixing burner (2) is provided with an air inlet pipe (20) and a gas inlet pipe (21); the outer side of the air inlet pipe (20) is provided with a first preheating sleeve (6); the outer side of the gas inlet pipe (21) is provided with a second preheating sleeve (7); and the middle of the right side of the combustion box (1) is provided with a smoke outlet pipe (15) connected to a smoke channel (17).

2. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 1 is characterized in that: A heat preservation layer and a thermal insulation layer are provided between the inner wall and the outer wall of the combustion box (1), and the thermal insulation layer is located on the inner side of the heat preservation layer.

3. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 1 is characterized in that: The bottom of the combustion box (1) is provided with two supporting feet (16) which are arranged symmetrically on the left and right.

4. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 1, characterized in that: A fluid input pipe (3) communicating with the fluid channel (12) is provided at the bottom end of the right side of the combustion box (1), and a fluid output pipe (4) communicating with the fluid channel (12) is provided at the top end of the right side of the combustion box (1).

5. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 1, characterized in that: A first liquid guide tube (50) is provided on the left side of the U-shaped hollow plate (5) and near the top. The end of the first liquid guide tube (50) away from the U-shaped hollow plate (5) passes through the inner side of the partition plate (10) and the combustion box (1) in sequence and is connected to the first preheating sleeve (6).

6. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 5, characterized in that: A second liquid guide tube (51) is provided on the left side of the U-shaped hollow plate (5) and near the bottom. An end of the second liquid guide tube (51) away from the U-shaped hollow plate (5) passes through the inner side of the partition plate (10) and the combustion box (1) in sequence and is connected to the second preheating sleeve (7).

7. The low nitrogen oxide combustion chamber structure of a gas boiler according to claim 6, characterized in that: The U-shaped hollow plate (5), the first liquid guiding tube (50), the second liquid guiding tube (51), the first preheating sleeve (6) and the second preheating sleeve (7) are filled with a heat-conducting solution (8).

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