Low-nitrogen combustor of water jacket furnace

Abstract

The utility model relates to the technical field of combustors, and discloses a water jacket furnace low-nitrogen combustor which comprises a shell, a diverging device is arranged on the front side of the shell, a mixing cavity is fixed at the front end of the diverging device, grading supply assemblies are arranged in the shell and on the outer wall of the mixing cavity, and each grading supply assembly comprises an air blower fixed in the shell. An air conveying pipe of the air blower is fixed to the rear end of the diffuser, and a gas input pipe is fixed to the right side of the shell in a penetrating mode. Air is input into the mixing cavity through the air blower, first-stage air supply is achieved, external air is sucked from the supply pipe to serve as second-stage air supplementary supply, oxygen supply of a combustion area is more uniform through introduction of the second-stage air, and therefore the combustion temperature is lowered, generation of thermal NOx is reduced, and the combustion efficiency is improved. And the secondary air supply does not need an additional air supply mechanism, so that the device is more energy-saving.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, and in particular to a low-NOx burner for a water-jacketed furnace. Background Technology

[0002] A burner is a general term for a device that sprays fuel and air in a specific manner for combustion. Burners are classified into several types based on their application: industrial burners, combustion engines, civil burners, and special burners. They are mostly made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or titanium. The function of a burner is to atomize a sample through flame combustion.

[0003] An existing low-NOx burner (publication number: CN218721468U) has at least the following drawbacks: the device only has a primary air supply mechanism, which makes it impossible to dilute or cool the local high-temperature area in the subsequent gas combustion process, and easily generates a large amount of thermal NOx. However, directly adding an air supply mechanism will also increase the energy consumption and cost of the device. Therefore, this utility model is proposed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-NOx burner for a water jacket furnace.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-NOx burner for a water-jacketed boiler includes a shell. A diffuser is disposed on the front side of the shell, and a mixing chamber is fixed to the front end of the diffuser. A burner head is fixed to the front end of the mixing chamber. A staged supply assembly is disposed inside the shell and on the outer wall of the mixing chamber. The staged supply assembly includes a blower fixed inside the shell. The blower's air supply pipe is fixed to the rear end of the diffuser. A gas input pipe is fixed through the right side of the shell. One end of the gas input pipe passes through the blower's air supply pipe and is connected to the diffuser. Four supply pipes are fixed to the outer wall of the mixing chamber. The four supply pipes are arranged in a concentric array on the outer wall of the mixing chamber. The angle between the axis of the supply pipe and the axis of the mixing chamber is 30 to 45 degrees.

[0007] As a further embodiment of this utility model, a throttling valve is fixed at the end of the supply pipe away from the mixing chamber, a flow solenoid valve is fixed at the end of the gas input pipe away from the outer shell, a connecting frame is fixed at one end of the blower's air inlet pipe, a first adjusting cylinder is fixed inside the connecting frame, a second adjusting cylinder is rotatably connected between the first adjusting cylinder and the connecting frame, ventilation holes are provided on the outer walls of both the first and second adjusting cylinders, a drive motor is fixed on the top surface of the connecting frame, and the output end of the drive motor passes through the top surface of the connecting frame and is fixed to the top surface of the second adjusting cylinder.

[0008] As a further embodiment of this utility model, a diverging tube is fixed in the middle of the interior of the diffuser, and several diverging holes are opened on the front side of the diverging tube. One end of the gas input pipe is connected and fixed to the rear end of the diverging tube.

[0009] As a further embodiment of this utility model, a one-way valve is fixed at the end of the throttle valve away from the mixing chamber.

[0010] As a further embodiment of this utility model, a control cabinet is fixed on the left side of the outer casing, and a PLC controller is installed inside the control cabinet. An igniter is installed on the front side of the outer casing. The blower, flow solenoid valve, drive motor and igniter are all electrically connected to the PLC controller.

[0011] As a further embodiment of this utility model, the outer wall of the mixing chamber is fixed with a mounting flange, and the end of the supply pipe away from the mixing chamber extends through to the rear side of the mounting flange.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Air is supplied to the mixing chamber by a blower to achieve primary air supply. During this process, gas is supplied to the diffuser through the gas input pipe, so that the gas and primary air are initially mixed inside the mixing chamber. Then, the mixed gas flows rapidly towards the burner. During this process, due to the high-speed flow of gas in the mixing chamber, the local pressure in the chamber decreases, thus forming a negative pressure area at the opening of the inclined supply pipe. With the help of this pressure difference, external air can be drawn in from the supply pipe as secondary air supplement. Through the introduction of secondary air, the oxygen supply in the combustion zone is more uniform and diluted, thereby reducing the combustion temperature and reducing the generation of thermal NOx. Moreover, the secondary air supply does not require an additional air supply mechanism, making the device more energy-efficient. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a low-NOx burner for a water-jacketed furnace proposed in this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the connecting frame of a low-NOx burner for a water jacket furnace proposed in this utility model;

[0016] Figure 3 This is a three-dimensional cross-sectional view of the outer shell of a low-NOx burner for a water-jacketed furnace proposed in this utility model.

[0017] Figure 4 for Figure 3 A magnified view of the partial three-dimensional structure at the center circle.

[0018] In the diagram: 1. Outer shell; 101. Diverter; 102. Mixing chamber; 103. Burner head; 2. Blower; 201. Gas input pipe; 202. Supply pipe; 203. Throttling valve; 204. Flow solenoid valve; 205. Connecting frame; 206. First regulating cylinder; 207. Second regulating cylinder; 208. Ventilation hole; 209. Drive motor; 3. Diverter pipe; 301. Diverter hole; 4. Check valve; 5. Control cabinet; 501. Ignition device; 6. Mounting flange. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1-4As shown, a low-NOx burner for a water-jacketed boiler includes a shell 1. A diffuser 101 is provided on the front side of the shell 1. A mixing chamber 102 is fixed to the front end of the diffuser 101. A burner head 103 is fixed to the front end of the mixing chamber 102. A staged supply assembly is provided inside the shell 1 and on the outer wall of the mixing chamber 102. The staged supply assembly includes a blower 2 fixed inside the shell 1. The air supply pipe of the blower 2 is fixed to the rear end of the diffuser 101. A gas input pipe 201 is fixed through the right side of the shell 1. One end of the gas input pipe 201 passes through the air supply pipe of the blower 2 and is connected to the diffuser 101. Four supply pipes 202 are fixed on the outer wall of the mixing chamber 102. The four supply pipes 202 are arranged in a circular array on the outer wall of the mixing chamber 102. The angle between the axis of the supply pipe 202 and the axis of the mixing chamber 102 is 30 to 45 degrees.

[0023] like Figures 2-4 As shown, in this embodiment, a throttle valve 203 is fixed to the end of the supply pipe 202 away from the mixing chamber 102, a flow solenoid valve 204 is fixed to the end of the gas input pipe 201 away from the outer casing 1, a connecting frame 205 is fixed to one end of the air inlet pipe of the blower 2, a first regulating cylinder 206 is fixed inside the connecting frame 205, and a second regulating cylinder 207 is rotatably connected between the first regulating cylinder 206 and the connecting frame 205. Ventilation holes 208 are provided on the outer walls of both the first regulating cylinder 206 and the second regulating cylinder 207. A drive motor 209 is fixed to the top surface of the connecting frame 205, and the output end of the drive motor 209 passes through the top surface of the connecting frame 205 and is fixed to the top surface of the second regulating cylinder 207. By starting the drive motor 209, the second regulating cylinder 207 is rotated, thereby aligning or misaligning the ventilation holes 208 of the first regulating cylinder 206 and the second regulating cylinder 207, thus controlling the intake air of the blower 2. The primary air is then compressed and delivered to the diffuser 101 by the blower 2, while the fuel gas is delivered to the diffuser 101 through the fuel gas input pipe 201. At this time, the fuel gas and the primary air are simultaneously delivered to the mixing chamber 102 and initially mixed. The mixed gas then flows rapidly toward the burner 103. During this process, due to the high-speed flow of the gas in the mixing chamber 102, the local pressure in the chamber decreases, thus forming a negative pressure area at the opening of the inclined supply pipe 202. With the help of this pressure difference, external air can be drawn in from the supply pipe 202 as a supplementary supply for the secondary air. During this process, the igniter 501 is activated to ignite the gas output from the burner 103. With the introduction of the secondary air, the oxygen supply in the combustion zone is more uniform, thereby reducing the combustion temperature and reducing the generation of thermal NOx. Moreover, the secondary air supply does not require an additional air supply mechanism, making the device more energy-efficient.

[0024] like Figures 2-4As shown, in this embodiment, a diverging tube 3 is fixed in the middle of the interior of the diffuser 101. Several diverging holes 301 are opened on the front side of the diverging tube 3. One end of the gas input pipe 201 is connected and fixed to the rear end of the diverging tube 3. Gas is transported to the diverging tube 3 through the gas input pipe 201 and sprayed out through several diverging holes 301. By utilizing the fact that the diverging tube 3 is located in the middle of the interior of the diffuser 101, the diverging holes 301 are evenly distributed inside the diverging tube 3, so that they can be better mixed with the gas input into the diffuser 101 and the mixing effect is increased.

[0025] like Figures 2-4 As shown in this embodiment, a one-way valve 4 is fixed at the end of the throttle valve 203 away from the mixing chamber 102. By setting the one-way valve 4, the pressure difference between the inside and outside of the mixing chamber 102 can be prevented from decreasing when the burner slowly stops working, which would cause the gas inside the mixing chamber 102 to be discharged through the supply pipe 202 and pollute the environment.

[0026] like Figures 2-4 As shown, in this embodiment, a control cabinet 5 is fixed on the left side of the outer casing 1. A PLC controller is installed inside the control cabinet 5. An igniter 501 is installed on the front side of the outer casing 1. The blower 2, flow solenoid valve 204, drive motor 209 and igniter 501 are all electrically connected to the PLC controller. The gas output by the burner head 103 is ignited by the igniter 501.

[0027] like Figures 2-4 As shown, in this embodiment, the outer wall of the mixing chamber 102 is fixed with a mounting flange 6, and the end of the supply pipe 202 away from the mixing chamber 102 extends through to the rear side of the mounting flange 6. The burner can be installed with the water jacket furnace by setting the mounting flange 6.

[0028] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: In use, the opening degree of the flow solenoid valve 204 is set by the control cabinet 5 to control the gas supply. Then, the drive motor 209 is started to drive the second regulating cylinder 207 to rotate, thereby aligning or misaligning the ventilation holes 208 of the first regulating cylinder 206 and the second regulating cylinder 207, thereby controlling the amount of air drawn in by the blower 2. The throttle valve 203 is adjusted according to the primary air and gas input to control the air intake of the supply pipe 202. The primary air drawn in is then compressed and transported to the inside of the divergence pipe 3 by the blower 2. During this process, the gas is also transported to the divergence pipe 3 through the gas input pipe 201 and discharged through the divergence hole 301. At this time, the gas and primary air are simultaneously delivered to the mixing chamber 102 and initially mixed. Then, the mixed gas flows rapidly to the burner head 103. During this process, due to the high-speed flow of the gas in the mixing chamber 102, the local pressure in the chamber decreases, thus forming a negative pressure area at the opening of the inclined supply pipe 202. With the help of this pressure difference, external air can be drawn in from the supply pipe 202 as a supplementary supply for secondary air. During this process, the igniter 501 is activated to ignite the gas output from the burner head 103. With the introduction of secondary air, the oxygen supply in the combustion zone is more uniform, thereby reducing the combustion temperature and reducing the generation of thermal NOx. Moreover, the secondary air supply does not require an additional air supply mechanism, making the device more energy-efficient.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A low-NOx burner for a water-jacketed furnace, comprising a shell (1), characterized in that, A diffuser (101) is provided on the front side of the outer shell (1). A mixing chamber (102) is fixed at the front end of the diffuser (101). A burner (103) is fixed at the front end of the mixing chamber (102). A graded supply assembly is provided inside the outer shell (1) and on the outer wall of the mixing chamber (102). The graded supply assembly includes a blower (2) fixed inside the outer shell (1). The air supply pipe of the blower (2) is fixed to the rear end of the diffuser (101). A gas input pipe (201) is fixed through the right side of the outer shell (1). One end of the gas input pipe (201) passes through the air supply pipe of the blower (2) and is connected to the diffuser (101). Four supply pipes (202) are fixed on the outer wall of the mixing chamber (102). The four supply pipes (202) are arranged in a circular array on the outer wall of the mixing chamber (102). The angle between the axis of the supply pipe (202) and the axis of the mixing chamber (102) is 30 to 45 degrees.

2. The low-NOx burner for a water-jacketed furnace according to claim 1, characterized in that, A throttle valve (203) is fixed at one end of the supply pipe (202) away from the mixing chamber (102). A flow solenoid valve (204) is fixed at one end of the gas input pipe (201) away from the outer shell (1). A connecting frame (205) is fixed at one end of the air inlet pipe of the blower (2). A first regulating cylinder (206) is fixed inside the connecting frame (205). A second regulating cylinder (207) is rotatably connected between the first regulating cylinder (206) and the connecting frame (205). Ventilation holes (208) are opened on the outer walls of both the first regulating cylinder (206) and the second regulating cylinder (207). A drive motor (209) is fixed on the top surface of the connecting frame (205). The output end of the drive motor (209) passes through the top surface of the connecting frame (205) and is fixed to the top surface of the second regulating cylinder (207).

3. A low-NOx burner for a water-jacketed furnace according to claim 2, characterized in that, The diffuser (101) has a diffuser tube (3) fixed in the middle of its interior. Several diffuser holes (301) are opened on the front side of the diffuser tube (3). One end of the gas input pipe (201) is connected and fixed to the rear end of the diffuser tube (3).

4. A low-NOx burner for a water-jacketed furnace according to claim 3, characterized in that, A one-way valve (4) is fixed at the end of the throttle valve (203) away from the mixing chamber (102).

5. A low-NOx burner for a water-jacketed furnace according to claim 4, characterized in that, A control cabinet (5) is fixed on the left side of the outer casing (1). A PLC controller is installed inside the control cabinet (5). An igniter (501) is installed on the front side of the outer casing (1). The blower (2), flow solenoid valve (204), drive motor (209) and igniter (501) are all electrically connected to the PLC controller.

6. A low-NOx burner for a water-jacketed furnace according to claim 5, characterized in that, The outer wall of the mixing chamber (102) is fixed with a mounting flange (6), and the end of the supply pipe (202) away from the mixing chamber (102) extends through to the rear side of the mounting flange (6).

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