A low-nitrogen combustion device

Abstract

The application provides a low-nitrogen combustion device, relates to the technical field of combustion equipment, and comprises a first combustor and a second combustor. The gas outlet of the first combustor is communicated with the gas inlet of the second combustor through a communicating pipe. The gas inlet of the first combustor is connected with an air inlet pipe. The gas outlet of the second combustor is connected with an air outlet pipe. One side of the air inlet pipe and one side of the air outlet pipe are communicated through a backflow pipe. A first electromagnetic valve is arranged on the backflow pipe. The gas outlet of the first combustor and the gas outlet of the second combustor are both provided with anti-collision assemblies. The rear side of the anti-collision assemblies is provided with filter assemblies. The staged combustion structure formed by the first combustor and the second combustor can effectively reduce the generation amount of nitrogen oxides. The backflow pipe is used to backflow the tail gas for secondary combustion, so that the fuel utilization rate is improved. The anti-collision assemblies at the gas outlets are matched with the filter assemblies, so that the subsequent related components can be effectively prevented from being eroded by silicon dust, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] This application relates to the field of combustion equipment technology, and more specifically, to a low-NOx combustion device. Background Technology

[0002] As a key raw material in rubber, electronics, coatings and other fields, the production process of silica (such as gas phase method and precipitation method) requires high-temperature combustion equipment to complete the pyrolysis and conversion of raw materials.

[0003] In existing combustion devices, staged combustion is often used to reduce the nitrogen oxide content in the combustion exhaust gas, and the exhaust gas produced by the burner is returned to the combustion chamber of the burner through a pipeline for secondary combustion. However, in the silica industry, the combustion exhaust gas of the combustion device carries silica dust. Silica dust has a high hardness (Mohs hardness 6-7), and when it flows back with the exhaust gas, it continuously erodes the inner wall of the pipeline, the nozzles of the combustion chamber, valves, and other components, leading to accelerated wear of the components and affecting their service life. Summary of the Invention

[0004] The purpose of this application is to provide a low-NOx combustion device that can solve the technical problems mentioned in the background art.

[0005] This application provides a low-NOx combustion device, including a first burner and a second burner. The outlet of the first burner is connected to the inlet of the second burner through a connecting pipe. The inlet of the first burner is connected to an inlet pipe, and the outlet of the second burner is connected to an outlet pipe. One side of the inlet pipe and one side of the outlet pipe are connected through a return pipe. A first solenoid valve is provided on the return pipe. Anti-rush components are provided at the outlets of both the first and second burners. A filter component is provided behind the anti-rush components.

[0006] Furthermore, the anti-impact assembly includes a sealing cover and multiple buffer components. The air outlets of the first burner and the second burner are each provided with an opening adapted to the sealing cover. The sealing cover is placed over the opening at the corresponding position. The upper end of the buffer component is fixedly connected to the bottom of the sealing cover. The buffer components are arranged in at least two rows, with adjacent rows of buffer components staggered.

[0007] Furthermore, the side of the buffer component that comes into contact with the exhaust gas is provided with multiple buffer grooves evenly.

[0008] Furthermore, the filter assembly includes a filter frame and a filter screen. The upper end of the filter frame is fixed to the bottom of the sealing cover plate, and the filter screen is fixed to the filter frame. A sealing strip is installed on the periphery of the filter frame, and the sealing strip abuts against the inner wall of the air outlet at the corresponding position.

[0009] Furthermore, both the first burner and the second burner are provided with a sealing door on one side, and the sealing door is provided with a transparent window.

[0010] Furthermore, the first burner is provided with a nozzle, which is connected to the air intake pipe.

[0011] Furthermore, temperature sensors are provided at the top of the first burner and the inner top of the second burner.

[0012] Furthermore, a fan is installed on the return pipe.

[0013] Furthermore, a second solenoid valve is provided on the connecting pipe.

[0014] Furthermore, both the first burner and the second burner are equipped with an igniter on one side, and the ignition end of the igniter extends into the corresponding burner.

[0015] The beneficial effects of this utility model are:

[0016] This invention effectively reduces nitrogen oxide generation through a staged combustion structure consisting of a first burner and a second burner. At the same time, it utilizes a return pipe to recirculate the exhaust gas for secondary combustion, thereby improving fuel utilization. The anti-impact component at the exhaust port reduces the erosion and wear of the filter component by silicon dust, and the filter component further filters the silicon dust, effectively preventing silicon dust from eroding and wearing subsequent related components, and extending the service life of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0019] Figure 2 This is a top view of some embodiments of this application;

[0020] Figure 3 These are cross-sectional views of some embodiments of this application;

[0021] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0022] Figure 5 This is a schematic diagram of the anti-collision component and the filter component in some embodiments of this application;

[0023] Figure 6 This is a bottom view of the anti-impact component and the filter component in some embodiments of this application;

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. First burner; 2. Second burner; 3. Connecting pipe; 4. Inlet pipe; 5. Outlet pipe; 6. Return pipe; 7. First solenoid valve; 8. Anti-impact assembly; 81. Sealing cover; 82. Buffer; 821. Buffer groove; 9. Filter assembly; 91. Filter frame; 92. Filter screen; 10. Sealing strip; 11. Sealing door; 12. Transparent window; 13. Nozzle; 14. Temperature sensor; 15. Fan; 16. Second solenoid valve; 17. Ignition device. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific Implementation

[0032] like Figure 1-6 As shown, this application provides a low-NOx combustion device, including a first burner 1 and a second burner 2. The outlet of the first burner 1 is connected to the inlet of the second burner 2 via a connecting pipe 3. The inlet of the first burner 1 is connected to an inlet pipe 4, and the outlet of the second burner 2 is connected to an outlet pipe 5. One side of the inlet pipe 4 and one side of the outlet pipe 5 are connected via a return pipe 6. A first solenoid valve 7 is provided on the return pipe 6. Anti-impact components 8 are provided at the outlets of both the first burner 1 and the second burner 2, and a filter component 9 is provided behind the anti-impact components 8. In use, fuel and combustion air enter the first burner 1 through the inlet pipe 4 for initial combustion. The combustion products then enter the second burner 2 through the connecting pipe 3 to complete subsequent combustion, forming a staged combustion process to suppress the generation of nitrogen oxides. At the same time, some of the exhaust gas generated by the combustion in the second burner 2 can be returned through the return pipe 6. The exhaust gas is fed into the intake pipe 4, where it mixes with the newly input fuel and air before re-entering the first burner 1 for combustion, achieving secondary utilization of the exhaust gas. The remaining exhaust gas is transported to the exhaust gas treatment equipment through the exhaust pipe 5 for processing. The first solenoid valve 7 on the return pipe 6 can regulate the exhaust gas return flow rate. The anti-impact components 8 at the outlets of the first burner 1 and the second burner 2 can reduce the impact of silicon dust-containing exhaust gas on subsequent components, while the filter component 9 filters the silicon dust in the exhaust gas. This device effectively reduces the generation of nitrogen oxides through the staged combustion structure formed by the first burner 1 and the second burner 2. At the same time, the exhaust gas is returned to the return pipe 6 for secondary combustion, improving fuel utilization. The anti-impact components 8 at the outlet can reduce the impact and wear of silicon dust on the filter component 9, and the filter component 9 further filters the silicon dust, effectively preventing the impact and wear of silicon dust on subsequent related components and extending the service life of the equipment.

[0033] like Figure 3-6As shown, the anti-impact assembly 8 includes a sealing cover plate 81 and multiple buffer members 82. The air outlets of the first burner 1 and the second burner 2 are each provided with openings adapted to the sealing cover plate 81. The sealing cover plate 81 covers the corresponding openings. The upper end of each buffer member 82 is fixedly connected to the bottom of the sealing cover plate 81. The buffer members 82 are arranged in at least two rows, with adjacent rows of buffer members 82 staggered. Specifically, the sealing cover plate 81 has a set of mounting through holes, and the openings are provided with corresponding mounting through holes. The threaded hole allows the sealing cover plate 81 to be installed at the opening by passing a bolt through the mounting through hole and screwing it into the threaded hole. A sealing ring is provided at the opening, which can abut against the bottom of the sealing cover plate 81 to seal the gap between the sealing cover plate 81 and the opening. When the combustion exhaust gas containing silicon dust is discharged from the outlet, the exhaust gas flow will be blocked and diverted by the misaligned buffer 82 layer by layer, changing the direction and speed of the airflow, reducing the direct impact of the airflow on the subsequent filter assembly 9, and extending the service life of the filter assembly 9.

[0034] like Figure 4 and Figure 5 As shown, multiple buffer grooves 821 are evenly provided on the side of the buffer member 82 that comes into contact with the exhaust gas. When the exhaust gas containing silicon dust impacts, some of the silicon dust gradually accumulates in the buffer grooves 821, which can buffer the impact of the subsequent airflow, reduce the scouring and wear of the airflow on the buffer member 82, and extend the service life of the buffer member 82.

[0035] like Figure 4 and Figure 5 As shown, the filter assembly 9 includes a filter frame 91 and a filter screen 92. The upper end of the filter frame 91 is fixed to the bottom of the sealing cover plate 81, and the filter screen 92 is fixed to the filter frame 91. A sealing strip 10 is installed on the periphery of the filter frame 91, and the sealing strip 10 abuts against the inner wall of the corresponding air outlet. When the exhaust gas containing silicon dust flows through the filter assembly 9 after being buffered by the anti-impact component 8, the filter screen 92 intercepts the silicon dust particles in the exhaust gas. At the same time, the sealing strip 10 on the periphery of the filter frame 91 can prevent the exhaust gas from leaking from the gap between the filter frame 91 and the air outlet, ensuring that all exhaust gas must be filtered through the filter screen 92 before entering the subsequent pipeline or return system, and avoiding the silicon dust from causing erosion and wear to subsequent components.

[0036] like Figure 2 As shown, both the first burner 1 and the second burner 2 are provided with a sealing door 11 on one side, and a transparent window 12 is provided on the sealing door 11. The operator can open the sealing door 11 and put the silica raw material to be heated into the corresponding burner. The combustion situation inside the burner can be directly observed through the transparent window 12.

[0037] like Figure 3As shown, the first burner 1 is equipped with a nozzle 13, which is connected to the air intake pipe 4; the fuel and combustion air delivered by the air intake pipe 4 can be injected into the combustion chamber of the first burner 1 through the nozzle 13.

[0038] like Figure 1-3 As shown, temperature sensors 14 are provided at the top of the inner part of the first burner 1 and the top of the second burner 2. The probes of the temperature sensors 14 extend into the corresponding burners. The temperature sensors 14 are electrically connected to the controller. The temperature sensors 14 are used to monitor the temperature inside the first burner 1 and the second burner 2 to ensure combustion effect.

[0039] like Figure 2 As shown, a fan 15 is installed on the return pipe 6; the first solenoid valve 7 and the fan 15 are electrically connected to the controller. The fan 15 ensures efficient return of exhaust gas. The controller can adjust the speed of the fan 15 and control the opening of the first solenoid valve 7 in order to control the return flow of exhaust gas.

[0040] like Figure 2 As shown, a second solenoid valve 16 is provided on the connecting pipe 3. The second solenoid valve 16 is electrically connected to the controller and can control the flow rate of combustion products between the first burner 1 and the second burner 2.

[0041] like Figure 3 As shown, an igniter 17 is provided on one side of both the first burner 1 and the second burner 2. The ignition end of the igniter 17 extends into the corresponding first burner 1 or second burner 2. The igniter 17 is electrically connected to the controller. When the device is started or the combustion condition requires re-ignition, the controller sends an electrical signal to the igniter 17 to trigger the ignition end of the igniter 17 to generate an electric spark, which ignites the fuel and air mixture injected by the nozzle 13 in the combustion chamber, thereby realizing the start-up ignition of the burner.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low-NOx combustion device, characterized in that: The device includes a first burner and a second burner. The air outlet of the first burner is connected to the air inlet of the second burner through a connecting pipe. The air inlet of the first burner is connected to an air inlet pipe, and the air outlet of the second burner is connected to an air outlet pipe. One side of the air inlet pipe and one side of the air outlet pipe are connected through a return pipe. A first solenoid valve is provided on the return pipe. Anti-rush components are provided at the air outlets of both the first and second burners. A filter component is provided behind the anti-rush components.

2. The low-NOx combustion device according to claim 1, characterized in that: The anti-impact assembly includes a sealing cover and multiple buffer components. The air outlets of the first burner and the second burner are provided with openings adapted to the sealing cover. The sealing cover is placed over the openings at the corresponding positions. The upper end of the buffer component is fixedly connected to the bottom of the sealing cover. The buffer components are arranged in at least two rows, with adjacent rows of buffer components staggered.

3. The low-NOx combustion device according to claim 2, characterized in that: The side of the buffer component that comes into contact with the exhaust gas is provided with multiple buffer grooves evenly distributed.

4. A low-NOx combustion device according to claim 2, characterized in that: The filter assembly includes a filter frame and a filter screen. The upper end of the filter frame is fixed to the bottom of the sealing cover plate, and the filter screen is fixed to the filter frame. A sealing strip is installed on the periphery of the filter frame, and the sealing strip abuts against the inner wall of the air outlet at the corresponding position.

5. A low-NOx combustion device according to claim 1, characterized in that: Both the first burner and the second burner have a sealing door on one side, and the sealing door has a transparent window.

6. A low-NOx combustion device according to claim 1, characterized in that: The first burner is equipped with a nozzle, which is connected to the air inlet pipe.

7. A low-NOx combustion device according to claim 1, characterized in that: Temperature sensors are provided on the inner top of the first burner and the top of the second burner.

8. A low-NOx combustion device according to claim 1, characterized in that: A fan is installed on the return pipe.

9. A low-NOx combustion device according to claim 1, characterized in that: A second solenoid valve is installed on the connecting pipe.

10. A low-NOx combustion device according to claim 1, characterized in that: Both the first burner and the second burner are equipped with igniters on one side, and the ignition end of the igniter extends into the corresponding burner.

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