Low power carbon depositing burner

Abstract

The utility model relates to a kind of low-power anti-carbon deposition combustor, including shell, shell is equipped with air inlet, shell is fixedly connected with jet sleeve, the inner chamber of shell is communicated with the inner chamber of jet sleeve, shell fixedly is provided with gas inlet pipe, the air inlet end of gas inlet pipe is protruding from shell, the air outlet end of gas inlet pipe is located in the inner chamber of jet sleeve, the air outlet end of gas inlet pipe is fixedly provided with air mixing disc, air mixing disc includes cylinder part, the outer edge portion of the opening rim outside of cylinder part is equipped with, the front end edge of cylinder part is equipped with annular taper face, annular taper face is equipped with several taper face air outlet holes, the outer circumferential surface of cylinder part is equipped with several circumferential surface air outlet holes, the circumferential surface of outer edge portion is equipped with several air passage grooves, air passage groove is relatively axially inclined arrangement.The utility model can work under low power, and under lower air-fuel ratio condition, reduce the formation of carbon deposition.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to a low-power anti-carbon-deposit burner. Background Technology

[0002] The high-temperature insulation zone of roller kilns consumes relatively low amounts of fuel gas, causing the burners to operate at low power (low fuel gas flow) for extended periods. Conventional burners are typically set to a power of 30-60 kW, but the actual operating power per burner is approximately 10 kW. Operating under low power (low fuel gas flow) and low air-fuel ratio conditions, conventional burners are prone to carbon buildup on the inner wall of their silicon carbide sleeves. Therefore, the industry urgently needs a high-temperature resistant, low-power burner.

[0003] In the high-temperature insulation zone of a roller kiln, the combustion air needs to be heated to 200℃. When the combustion air temperature reaches 200℃, its density decreases, and the oxygen mass per cubic meter of air decreases accordingly. To achieve the same air-fuel ratio, a larger air volumetric flow rate is required. Comparing normal temperature combustion air with 200℃ combustion air as an example: at the same power, the required air flow rate for 200℃ combustion air is approximately 1.6 times that for normal temperature combustion air, and the required air inlet pressure is also nearly 1.6 times higher. Therefore, without changing the original pressure, the system provides a smaller air flow rate, necessitating that the burner can operate stably under lower air-fuel ratio conditions. Utility Model Content

[0004] The purpose of this invention is to provide a low-power anti-carbon-deposit burner that can operate at low power and with a low air-fuel ratio, thereby alleviating the problem of carbon deposits in burners during actual production.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A low-power carbon-depositing burner includes a shell with an air inlet. An air jet sleeve is fixedly connected to the shell, and the inner cavity of the shell communicates with the inner cavity of the air jet sleeve. A gas inlet pipe is fixedly inserted through the shell, with its inlet end extending out of the shell and its outlet end located within the inner cavity of the air jet sleeve. A mixing plate is fixedly fitted onto the outlet end of the gas inlet pipe. The mixing plate includes a cylindrical portion, with an outer edge portion on the outer side of the opening edge. An annular conical surface is provided at the front edge of the cylindrical portion, with several conical air outlet holes on the annular conical surface. Several circumferential air outlet holes are provided on the outer circumferential surface of the cylindrical portion, and several ventilation grooves are provided on the circumferential surface of the outer edge portion, with the ventilation grooves inclined relative to the axial direction.

[0007] Specifically, the conical air vents and the circumferential air vents are arranged alternately along the circumferential direction.

[0008] Specifically, the number of air outlets on the conical surface is five to eight, and the number of air outlets on the circumferential surface is ten to fourteen. Both the air outlets on the conical surface and the air outlets on the circumferential surface are evenly distributed along the circumference.

[0009] Specifically, the diameter of the conical air outlet and the circumferential air outlet is 1mm-1.5mm.

[0010] Specifically, the diameter of the outer edge is D, 44mm≤D≤48mm.

[0011] Specifically, the width of the ventilation groove is W, 1.5mm≤W≤4mm, and the depth of the ventilation groove is H, 1mm≤H≤4mm.

[0012] Specifically, the angle between the extension direction of the vent groove and the axial direction is θ, where 30°≤θ≤60°.

[0013] Specifically, the jet sleeve is made of silicon carbide, the length of the jet sleeve is 400mm-700mm, the inner diameter of the rear section of the jet sleeve is d, 46mm≤d≤50mm, and the length of the rear section of the jet sleeve is greater than 300mm.

[0014] Specifically, the rear side of the housing has a rear opening, which is fixedly covered by a mounting cover. The inner cavity of the mounting cover has a gas intake passage. The rear end of the gas intake pipe is threadedly connected to the outlet end of the gas intake passage. The front side of the housing has a front opening, and the edge of the front opening has a flange. The front wall of the flange has a countersunk hole. The rear edge of the jet sleeve has a mounting edge, which is located inside the countersunk hole. A clamping plate is fixedly connected to the front wall of the flange.

[0015] Specifically, the outer edge end face is provided with multiple air vents, the diameter of which is 3mm-5mm. The multiple air vents are evenly distributed circumferentially. An igniter is installed at one of the air vents. The igniter extends out of the front end face of the outer edge. A wire is connected to the rear end of the igniter, and the wire extends out of the mounting cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The specific combination of parameters of the burner, such as the number of conical air outlet holes 412, the diameter D of the outer edge 42, the groove depth H, the included angle θ, the diameter of the air vent hole 422, and the length of the jet sleeve 2, enables the burner to alleviate the problem of carbon buildup caused by the reduced flow of combustion air (air) even under low combustion power (low gas flow) and low air-fuel ratio. Therefore, it can be applied to the specific working condition of the high-temperature heat preservation zone of roller kiln, which has a lower power (lower gas consumption). Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the burner of this utility model;

[0020] Figure 2 for Figure 1 A magnified view of a portion of the document;

[0021] Figure 3 An external view of the installed cover;

[0022] Figure 4 These are the three views of the mixing disc;

[0023] Figure 5 The graph shows the relationship between gas flow rate and pressure for various models of mixing discs, obtained through experiments.

[0024] Figure 6 The graph shows the relationship between airflow and pressure for various models of mixing discs, obtained through experiments.

[0025] Figure 7 Experimental data for the installation of a mixing disc in the preferred embodiment;

[0026] Figure 8 Experimental data for the mixing plate installed in the preferred embodiment 2.

[0027] In the picture:

[0028] 1. Housing; 11. Air inlet; 12. Mounting cover; 121. Gas inlet; 14. Countersunk hole; 15. Pressure plate;

[0029] 2. Jet sleeve;

[0030] 3. Gas inlet pipe;

[0031] 4. Mixing plate; 41. Cylinder section; 411. Annular conical surface; 412. Conical surface air outlet; 413. Circumferential surface air outlet;

[0032] 42. Outer edge; 421. Vent groove; 422. Air vent;

[0033] 5. Ignition device. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0035] See Figures 1 to 8 A low-power anti-carbon-deposit burner includes a housing 1 with an air inlet 11. An air jet sleeve 2 is fixedly connected to the housing 1, and the inner cavity of the housing 1 communicates with the inner cavity of the air jet sleeve 2. A gas inlet pipe 3 is fixedly inserted through the housing 1, with its inlet end extending out of the housing 1 and its outlet end located within the inner cavity of the air jet sleeve 2.

[0036] A mixing plate 4 is fixedly fitted onto the outlet end of the gas inlet pipe 3. The mixing plate 4 includes a cylindrical portion 41, with an outer edge portion 42 on the outer side of the opening edge of the cylindrical portion 41. An annular conical surface 411 is provided at the front edge of the cylindrical portion 41, and the annular conical surface 411 has several conical air outlet holes 412. Several circumferential air outlet holes 413 are provided on the outer circumferential surface of the cylindrical portion 41. Several ventilation grooves 421 are provided on the circumferential surface of the outer edge portion 42, and the ventilation grooves 421 are inclined relative to the axial direction.

[0037] Specifically, the conical air outlet 412 and the circumferential air outlet 413 are arranged alternately along the circumferential direction.

[0038] Specifically, the number of conical air outlets 412 is five to eight, and the number of circumferential air outlets 413 is ten to fourteen. Both the conical air outlets 412 and the circumferential air outlets 413 are evenly distributed along the circumferential direction.

[0039] Specifically, the diameters of the conical vent 412 and the circumferential vent 413 are 1mm-1.5mm.

[0040] Specifically, the diameter of the outer edge 42 is D, where 44mm ≤ D ≤ 48mm.

[0041] Specifically, the width of the venting groove 421 is W, 1.5mm≤W≤4mm, and the depth of the venting groove 421 is H, 1mm≤H≤4mm.

[0042] Specifically, the angle between the extension direction of the vent groove 421 and the axial direction is θ, where 30°≤θ≤60°.

[0043] Specifically, the jet sleeve 2 is made of silicon carbide, the length of the jet sleeve 2 is 400mm-700mm, the inner diameter of the rear section of the jet sleeve 2 is d, 46mm≤d≤50mm, and the length of the rear section of the jet sleeve 2 is greater than 300mm.

[0044] Specifically, the housing 1 has a rear opening on its rear side, and a mounting cover 12 is fixedly placed over the rear opening. The inner cavity of the mounting cover 12 has a gas intake passage 121, and the rear end of the gas intake pipe 3 is threadedly connected to the outlet end of the gas intake passage 121. The housing 1 has a front opening on its front side, and a flange is provided at the edge of the front opening. The front wall of the flange has a countersunk hole 14, and the rear edge of the jet sleeve 2 has a mounting edge, which is located inside the countersunk hole 14. A clamping plate 15 is fixedly connected to the front wall of the flange.

[0045] Specifically, the outer edge 42 end face is provided with multiple air vents 422, which are evenly distributed circumferentially. The diameter of each air vent 422 is 3mm-5mm. An igniter 5 is installed at one of the air vents 422 (the size of this vent has been adjusted to...). Figure 4 At point B, the igniter 5 extends out of the front end face of the outer edge 42, and the rear end of the igniter 5 is connected to a wire, which extends out of the mounting cover 12.

[0046] The dimensions of different specifications of mixing discs are compared below (not shown in the figure):

[0047] No. 2 mixing plate

[0048] Number of vents on the periphery: 413 12 Air vent diameter 422 4mm Outer edge 42 diameter D 50mm groove depth H 3mm included angle θ 30° Slot width W 3mm

[0049] No. 3 Mixing Plate

[0050] Number of vents on the periphery: 413 12 Air vent diameter 422 5mm Outer edge 42 diameter D 50mm groove depth H 3mm included angle θ 45° Slot width W 3mm

[0051] No. 4 Mixing Plate

[0052] Number of vents on the periphery: 413 12 Air vent diameter 422 5mm Outer edge 42 diameter D 50mm groove depth H 3mm included angle θ 30° Slot width W 3mm

[0053] No. 5 Mixing Plate

[0054] Number of vents on the periphery: 413 12 Air vent diameter 422 6mm Outer edge 42 diameter D 50mm groove depth H 3mm included angle θ 30° Slot width W 3mm

[0055] No. 6 Mixing Plate

[0056]

[0057]

[0058] No. 7 Mixing Plate

[0059] Number of vents on the periphery: 413 12 Air vent diameter 422 4mm Outer edge 42 diameter D 45mm groove depth H 3mm included angle θ 30° Slot width W 2.5mm

[0060] Based on the above comparative tests, fine-tuning was performed on the No. 7 mixing disc to obtain the No. 72 and No. 73 mixing discs, which were then installed in the following preferred embodiments:

[0061] The following is a preferred embodiment of the burner of this utility model.

[0062] Example 1 (equipped with a No. 72 mixing disc and matched with a 450mm jet sleeve)

[0063]

[0064]

[0065] Example 2 (Installation of No. 73 mixing disc, matched with 650mm jet sleeve)

[0066] Number of vents on the periphery: 413 12 Air vent diameter 422 4mm Outer edge 42 diameter D 45mm groove depth H 3mm included angle θ 45° Slot width W 2.5mm Jet sleeve 2 length 650mm Inner diameter d of jet sleeve 2 48mm

[0067] The working principle of this utility model is as follows:

[0068] High-pressure air enters the inner cavity of the housing 1 through the air inlet 11, and then passes through the air vent 422 and the venting groove 421 into the jet sleeve 2. Combustion enters the jet sleeve 2 through the combustion gas inlet pipe 3. Because the extension direction of the venting groove 421 is inclined axially, the air flowing through the venting groove 421 creates a swirling flow in the jet sleeve 2, thereby ensuring thorough mixing of the air and combustion gas within the jet sleeve 2. The igniter 5 is used to ignite the mixture.

[0069] The specific combination of parameters of the burner, such as the number of conical air outlet holes 412, the diameter D of the outer edge 42, the groove depth H, the included angle θ, the diameter of the air vent hole 422, and the length of the jet sleeve 2, enables the burner to alleviate the problem of carbon buildup caused by the reduced flow of combustion air (air) even under low combustion power (low gas flow) and low air-fuel ratio. Therefore, it can be applied to the specific working condition of the high-temperature heat preservation zone of roller kiln, which has a lower power (lower gas consumption).

[0070] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-power anti-carbon-deposit burner, characterized in that: The device includes a housing with an air inlet. A jet sleeve is fixedly connected to the housing, and the inner cavity of the housing communicates with the inner cavity of the jet sleeve. A gas inlet pipe is fixedly installed through the housing, with the inlet end of the gas inlet pipe extending out of the housing and the outlet end of the gas inlet pipe located inside the inner cavity of the jet sleeve. A mixing plate is fixedly fitted onto the outlet end of the gas inlet pipe. The mixing plate includes a cylindrical portion, with an outer edge portion on the outer side of the opening edge of the cylindrical portion. An annular conical surface is provided at the front edge of the cylindrical portion, with several conical air outlet holes on the annular conical surface. Several circumferential air outlet holes are provided on the outer circumferential surface of the cylindrical portion, and several ventilation grooves are provided on the circumferential surface of the outer edge portion. The ventilation grooves are inclined relative to the axial direction.

2. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The conical air vents and the circumferential air vents are arranged alternately along the circumferential direction.

3. The low-power anti-carbon-deposit burner according to claim 2, characterized in that: The number of air vents on the conical surface is five to eight, and the number of air vents on the circumferential surface is ten to fourteen. Both the conical surface air vents and the circumferential surface air vents are evenly distributed along the circumference.

4. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The diameter of the conical vent and the circumferential vent is 1mm-1.5mm.

5. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The diameter of the outer edge is D, and 44mm≤D≤48mm.

6. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The width of the ventilation groove is W, 1.5mm≤W≤4mm, and the depth of the ventilation groove is H, 1mm≤H≤4mm.

7. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The angle between the extension direction of the ventilation groove and the axial direction is θ, where 30°≤θ≤60°.

8. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The jet sleeve is made of silicon carbide, with a length of 400mm-700mm. The inner diameter of the rear section of the jet sleeve is d, where 46mm≤d≤50mm, and the length of the rear section of the jet sleeve is greater than 300mm.

9. The low-power anti-carbon-deposit burner according to claim 1, characterized in that: The rear side of the housing has a rear opening, which is fixedly covered by a mounting cover. The inner cavity of the mounting cover has a gas intake passage. The rear end of the gas intake pipe is threadedly connected to the outlet end of the gas intake passage. The front side of the housing has a front opening, and the edge of the front opening has a flange. The front wall of the flange has a countersunk hole. The rear edge of the jet sleeve has a mounting edge, which is located in the countersunk hole. A clamping plate is fixedly connected to the front wall of the flange.

10. The low-power anti-carbon-deposit burner according to claim 9, characterized in that: The outer edge end face is provided with multiple air vents, the diameter of which is 3mm-5mm. The multiple air vents are evenly distributed around the circumference. An igniter is installed at one of the air vents. The igniter extends out of the front end face of the outer edge. A wire is connected to the rear end of the igniter and extends out of the mounting cover.

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