Low-nitrogen burner of anode roasting furnace

Abstract

The utility model discloses a low-nitrogen combustor of an anode roasting furnace, and belongs to the technical field of combustors of anode roasting furnaces. Comprising a natural gas connector, a gas pipe, an outer pipe, a burner base and a gas spray pipe, the front end of the gas pipe is connected with the natural gas connector, the gas pipe and the gas spray pipe are sleeved with the outer pipe, gaps among the gas pipe, the gas spray pipe and the outer pipe form a gas inlet pipeline, the outer pipe is detachably connected with the burner base, and the burner base is used for being fixedly connected with a roasting furnace. The fuel gas spraying pipe is connected with the tail end of the fuel gas pipe, and a spiral spraying head is installed in the fuel gas spraying pipe and arranged away from a spraying opening of the fuel gas spraying pipe. The burner has the advantages that the outer sleeve is detachably connected with the burner base, so that the burner is convenient to maintain and replace; the spiral spray head is installed in the fuel gas spray pipe, natural gas can be sprayed out in a spiral shape, better combustion is achieved, the spiral spray head is arranged far away from a spray opening of the fuel gas spray pipe, the spiral spray head is far away from a high-temperature section, and generation of nitric oxide at the high temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of burners for anode baking furnaces, in particular to a low-nitrogen burner for anode baking furnaces. Background Art

[0002] Anode baking is one of the main heat treatment processes in the production of carbon products. Baking is carried out in a baking furnace, which is a high-temperature industrial furnace specially used for baking anodes. At present, many chemical industries and heavy industries in China involve low-nitrogen environmental protection requirements in the production process. Due to the production conditions of the anode baking furnace itself, the flue gas exceeds the nitrogen oxide (NOx) standard during the emission process, causing environmental pollution and bringing many adverse effects to the enterprise and the environment. In order to prevent the above phenomenon from happening, many companies add a denitrification frame to the original combustion control system of the baking furnace to reduce the emission of nitrogen oxides (NOx). However, the denitrification frame requires the use of a large amount of urea to reduce nitrogen oxides (NOx), which adds a lot of costs to the company. Utility Model Content

[0003] The utility model aims to provide a low-nitrogen burner for an anode baking furnace, so as to solve the technical problem that enterprises use a large amount of urea to reduce nitrogen oxide emissions, resulting in high costs.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A low-nitrogen burner for an anode baking furnace is designed, comprising a natural gas connector, a gas pipe, an outer pipe, a burner base and a gas nozzle, wherein the front end of the gas pipe is connected to the natural gas connector, the outer pipe is sleeved outside the gas pipe and the gas nozzle, the gap between the gas pipe, the gas nozzle and the outer pipe constitutes an air intake pipeline, the outer pipe is connected to the burner base, the burner base is used for fixed connection with the baking furnace, the gas nozzle is connected to the end of the gas pipe, and a spiral nozzle is installed in the gas nozzle.

[0006] Preferably, the spiral nozzle is a columnar structure, and a spiral groove is provided on the outer peripheral surface of the spiral nozzle.

[0007] Preferably, the spiral nozzle is provided with a main spray channel at a position on the center line along the axial direction of the column.

[0008] Preferably, the gas nozzle near the gas pipe end is an internal thread structure, the gas nozzle and the gas pipe end are threadedly connected, the threaded connection is a threaded section, a stepped channel is provided in the gas nozzle, the stepped channel includes a large diameter section and a small diameter section, the gas nozzle far from the gas pipe end is a nozzle, the small diameter section is located near the nozzle, the large diameter section is located between the threaded section and the small diameter section, and the spiral nozzle is installed in the large diameter section and positioned by the threaded section and the small diameter section.

[0009] Preferably, the outer tube includes an outer sleeve and a protective sleeve, the outer sleeve is sleeved on the upper periphery of the gas pipe, the upper end of the outer sleeve is connected to the natural gas connecting head, and the lower end is detachably connected to the upper end of the burner base, the protective sleeve is sleeved on the lower periphery of the gas pipe, the upper end of the protective sleeve is connected to the lower end of the burner base, the lower end of the protective sleeve is a combustion port, the gas nozzle far from the gas pipe end is a nozzle, the nozzle is located on the inner side of the protective sleeve, and the protective sleeve between the nozzle and the combustion port is the sleeve combustion part.

[0010] Preferably, a pressure plate is fixed to the outer periphery of the outer sleeve, and corresponding threaded holes are provided on the pressure plate and the burner base. The outer sleeve is detachably connected to the burner base via the pressure plate and a bolt assembly.

[0011] Preferably, the protective sleeve is provided with at least two smoke reflow holes at a position between the nozzle and the burner base, and the smoke reflow holes are staggered in the axial direction.

[0012] Preferably, it also includes an air conditioning sleeve, the natural gas connecting head is provided with an air inlet connected to the air inlet pipeline, the air conditioning sleeve is provided with an air inlet hole, the air conditioning sleeve is rotatably sleeved outside the natural gas connecting head, the air inlet hole is aligned with the air inlet on the natural gas connecting head by rotating the air conditioning sleeve and the size of the alignment hole is adjusted, and the air conditioning sleeve is relatively locked with the natural gas connecting head by a bolt assembly.

[0013] Preferably, a sealing component is further included. A sealing component is provided at a threaded connection between the natural gas connector and the outer sleeve, and a sealing component is provided at a threaded connection between the burner base and the protective sleeve.

[0014] Preferably, a splitter head with an arc-shaped longitudinal section is provided at a middle position near the end of the spiral nozzle near the gas pipe, which can reduce the gas resistance and evenly disperse the gas into each spiral channel.

[0015] Compared with the prior art, the beneficial technical effect of the utility model is that: a spiral nozzle is installed in the gas nozzle, which can make the natural gas spray out in a spiral shape, and a turbulent flow is formed inside the gas pipe, so that the natural gas and the oxygen coming in from the intake pipe are fully mixed, avoiding incomplete combustion of the natural gas in the gas pipe, and reducing the generation of nitrogen oxides at high temperature. At the same time, when the natural gas passes through the spiral gas head, the natural gas will be atomized to a certain extent. The flame area after atomization is large, the flame temperature is low, and the nitrogen oxides generated at high temperature can also be avoided to a certain extent. The setting of the combustion part lengthens the combustion part, increases the heat effect, and keeps the spiral nozzle away from the high temperature section, avoiding nitrogen oxides generated at high temperature to a certain extent. The outer sleeve is detachably connected to the burner base, which is convenient for maintenance and replacement; the spiral head in the gas nozzle can be taken out separately, which is convenient for maintenance and replacement. The overall structure of the utility model is relatively simple, and its production and maintenance costs are low. It greatly reduces the emission of nitrogen oxides, reduces the use of urea, reduces the production cost of the enterprise, and meets the environmental protection requirements. It can also burn evenly, and can achieve energy saving and consumption reduction on the basis of low nitrogen combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the assembly of the gas pipe and the gas nozzle in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the spiral nozzle in the utility model;

[0019] Figure 4 It is a structural schematic diagram of the utility model in an application scenario.

[0020] In the figure, 1-natural gas connector; 2-gas pipe; 3-outer sleeve; 4-burner base; 5-gas nozzle; 51-threaded section; 52-large diameter section; 53-small diameter section; 54-nozzle; 6-protective sleeve; 61-combustion part; 62-combustion port; 7-roasting furnace; 8-spiral nozzle; 81-spiral groove; 82-diverter; 83-main spray channel; 9-pressing plate; 10-smoke return hole; 11-air conditioning sleeve. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments, but the following embodiments are only used to illustrate the present invention in detail and do not limit the scope of the present invention in any way. The equipment parts, structures, etc. involved in the following embodiments are all conventional commercially available products unless otherwise specified.

[0022] Example 1: A low nitrogen burner for an anode baking furnace, see Figure 1-4, including a natural gas connector 1, a gas pipe 2, an outer pipe, a burner base 4 and a gas nozzle 5. The front end of the gas pipe 2 is connected to the natural gas connector 1, the outer pipe is sleeved outside the gas pipe 2 and connected to the lower end of the natural gas connector 1, the gap between the gas pipe 2 and the outer pipe constitutes an air intake pipeline, the outer pipe is detachably connected to the burner base 4, the burner base 4 is fixedly connected to the roasting furnace 7, the gas nozzle 5 is threadedly connected to the end of the gas pipe 2, a spiral nozzle 8 is installed in the gas nozzle 5, and the spiral nozzle 8 is arranged away from the nozzle 54 of the gas nozzle 5.

[0023] Specifically, Figure 1 As shown, the upper end of the natural gas connector 1 is used for threaded connection with the metal hose of the burner rack, the upper end of the gas pipe 2 is threadedly connected to the natural gas connector 1 and is communicated with the metal hose of the burner rack, the outer tube includes an outer sleeve 3 and a protective sleeve 6, the outer sleeve 3 is sleeved on the outside of the gas pipe 2 and is threadedly connected to the lower end of the natural gas connector 1, the outer sleeve 3 is detachably connected to the upper end of the burner base 4, the protective sleeve 6 is sleeved on the outside of the gas pipe 2 and the gas nozzle 5 and is threadedly connected to the lower end of the burner base 4, the nozzle 54 is located inside the protective sleeve 6, and the outlet end of the protective sleeve 6 is the combustion port 62, the natural gas sprayed from the nozzle 54 is mixed with oxygen in the air and burned at the combustion part 61, which increases the combustion stroke, and combustion also occurs outside the combustion port 61.

[0024] Preferably, Figure 1 As shown, a pressure plate 9 is fixed to the outer periphery of the outer sleeve, and corresponding threaded holes are provided on the pressure plate 9 and the burner base 4. The outer sleeve 3 is detachably connected to the burner base 4 through the pressure plate 9 and the bolt assembly. Such a design is convenient for disassembly and assembly, and is convenient for maintenance and replacement of the device. Preferably, the outer sleeve 3 and the pressure plate 9 are fixed by welding.

[0025] Preferably, Figure 1 and Figure 2 As shown, a stepped passage is provided in the gas nozzle 5, and the stepped passage includes a large diameter section 52 and a small diameter section 53. The small diameter section 53 is located near the nozzle 54, and the large diameter section 52 is located between the threaded section 51 and the small diameter section 53. The spiral nozzle 8 is installed in the large diameter section 52 and positioned by the threaded section 51 and the small diameter section 53. The small diameter section 53 not only plays a role in positioning the spiral nozzle 8, but also has a smaller diameter than the large diameter section 52, so that the diameter of the gas nozzle 5 near the nozzle 54 becomes smaller, which has a pressurizing and accelerating effect on the ejected natural gas. Therefore, the combustion flame can be sprayed deep into the fire channel to ensure that the temperature of the fire channel is uniform. Figure 3As shown, the spiral nozzle 8 is a columnar structure, and a spiral groove 81 is provided on the outer peripheral surface of the spiral nozzle 8. The spiral nozzle 8 is away from the high-temperature position at the bottom of the nozzle to reduce the nitrogen oxides formed by the local high temperature, and the spiral groove 81 can make the natural gas spray out in a spiral shape for better combustion. A diverter 82 with an arc-shaped longitudinal section is provided at the middle position of the upper end of the spiral nozzle 8 to reduce the gas resistance and evenly disperse the gas into each spiral groove 81. The spiral nozzle 8 is provided with a main spray channel 83 at the position on the center line along the axial direction of the column. The main spray channel 83 can make part of the natural gas spray farther, form a larger combustion range, and accelerate the combustion process. In other embodiments, the gas pipe 2 and the gas nozzle 5 can be designed as an integrated unit, and the spiral nozzle 8 is interference-fitted in the gas nozzle 5.

[0026] Furthermore, the low nitrogen burner of the anode baking furnace further includes a sealing assembly (not shown in the figure), a sealing assembly is provided at the threaded connection between the natural gas connector 1 and the outer sleeve 3, and a sealing assembly is provided at the threaded connection between the burner base 4 and the protective sleeve 6. Preferably, the sealing assembly is sealed with a graphite gasket to ensure that the connection is leak-proof.

[0027] Preferably, the material of the protective sleeve 6 is high temperature resistant and corrosion resistant silicon carbide material, which can operate for a long time in a high temperature environment of 1300° C. The protective sleeve 6 can protect the gas pipe 2, the spiral nozzle 8, and the gas nozzle 5 to prevent high temperature oxidation and burning.

[0028] Embodiment 2: Based on embodiment 1, Figure 1 As shown, at least two smoke return holes 10 are provided on the protective sleeve 6, and the smoke return holes 10 are staggered in the axial direction. Preferably, four smoke return holes 10 are provided in this embodiment, and the gas injection generates negative pressure drainage. The design of the smoke return holes 10 can ensure the smoke to reflux, recycle the smoke and unburned natural gas, and reduce the generation of nitrogen oxides while ensuring the temperature of the fire channel.

[0029] Embodiment 3: Based on embodiment 1, Figure 4 As shown, the low-nitrogen burner of the anode baking furnace also includes an air regulating sleeve 11. The natural gas connector 1 is provided with an air inlet connected to the air inlet pipeline. The air regulating sleeve 11 is provided with an air inlet hole. The air regulating sleeve 11 is rotatably sleeved outside the natural gas connector 1. The operator can rotate the air regulating sleeve 11 to align the air inlet hole with the air inlet on the natural gas connector 1 and adjust the size of the alignment hole, thereby adjusting the air intake volume of the baking furnace chamber. After the adjustment is completed, the air regulating sleeve 11 and the natural gas connector 1 are relatively locked by the bolt assembly.

[0030] In the process of reducing nitrogen oxides by combustion, after the natural gas is sprayed out through the spiral nozzle 8, an atomization effect will be formed. After atomization, the flame temperature is low, and the spiral nozzle 8 is far away from the bottom of the silicon carbide protective sleeve 6, which greatly reduces the high-temperature radiation and can reduce the nitrogen oxides generated under high temperature; after the natural gas is sprayed out through the spiral nozzle 8, the combustion part 61 of the protective sleeve 6 plays a certain role in gathering fire, and the gap and distance between the gas pipe 2 and the silicon carbide protective sleeve 6 produce a siphon effect, and the natural gas is subjected to staged combustion through the flue gas reflow hole 10, which can also greatly reduce nitrogen oxides.

[0031] The utility model is described in detail above with reference to the accompanying drawings and embodiments. However, those skilled in the art will appreciate that, without departing from the spirit of the utility model, the specific parameters in the above embodiments may be changed to form a plurality of specific embodiments, which are all within the common variation range of the utility model and will not be described in detail here.

Claims

1. A low nitrogen burner for an anode baking furnace, comprising a natural gas connector, a gas pipe, an outer pipe, a burner base and a gas nozzle, characterized in that: The front end of the gas pipe is connected to the natural gas connector, the outer pipe is sleeved outside the gas pipe and the gas nozzle, the gap between the gas pipe, the gas nozzle and the outer pipe constitutes an air intake pipeline, the outer pipe is connected to the burner base, the burner base is used to be fixedly connected to the roasting furnace, the gas nozzle is connected to the end of the gas pipe, and a spiral nozzle is installed in the gas nozzle.

2. The low nitrogen burner for anode baking furnace according to claim 1, characterized in that: The spiral nozzle is a columnar structure, and a spiral groove is provided on the outer peripheral surface of the spiral nozzle.

3. The low nitrogen burner for anode baking furnace according to claim 2, characterized in that: The spiral spray head is provided with a main spray channel at a position on the center line along the axial direction of the column.

4. The low nitrogen burner for anode baking furnace according to claim 1, characterized in that: The gas nozzle is provided with an internal thread structure at the end near the gas pipe, and the gas nozzle is threadedly connected to the end of the gas pipe, and the threaded connection is a threaded section. A stepped passage is provided in the gas nozzle, and the stepped passage includes a large diameter section and a small diameter section. The gas nozzle is provided with a nozzle at the end far from the gas pipe, and the small diameter section is located near the nozzle, and the large diameter section is located between the threaded section and the small diameter section. The spiral nozzle is installed in the large diameter section and is positioned by the threaded section and the small diameter section.

5. The low nitrogen burner for anode baking furnace according to claim 1, characterized in that: The outer tube includes an outer sleeve and a protective sleeve. The outer sleeve is sleeved on the outer periphery of the upper part of the gas pipe. The upper end of the outer sleeve is connected to the natural gas connecting head, and the lower end is detachably connected to the upper end of the burner base. The protective sleeve is sleeved on the outer periphery of the lower part of the gas pipe. The upper end of the protective sleeve is connected to the lower end of the burner base. The lower end of the protective sleeve is a combustion port. The end of the gas nozzle far from the gas pipe is a nozzle, and the nozzle is located on the inner side of the protective sleeve. The protective sleeve between the nozzle and the combustion port is the sleeve combustion part.

6. The low nitrogen burner for anode baking furnace according to claim 5, characterized in that: A pressing plate is fixed on the outer periphery of the outer sleeve, and corresponding threaded holes are provided on the pressing plate and the burner base. The outer sleeve is detachably connected to the burner base through the pressing plate and a bolt assembly.

7. The low nitrogen burner for anode baking furnace according to claim 5, characterized in that: The protective sleeve is provided with at least two smoke reflow holes at a position between the nozzle and the burner base, and the smoke reflow holes are staggered in the axial direction.

8. The low nitrogen burner for anode baking furnace according to claim 1, characterized in that: It also includes an air conditioning sleeve, the natural gas connection head is provided with an air inlet connected to the air inlet pipeline, the air conditioning sleeve is provided with an air inlet hole, the air conditioning sleeve is rotatably sleeved outside the natural gas connection head, the air inlet hole is aligned with the air inlet on the natural gas connection head by rotating the air conditioning sleeve and the size of the alignment hole is adjusted, and the air conditioning sleeve is relatively locked with the natural gas connection head by a bolt assembly.

9. The low nitrogen burner for anode baking furnace according to claim 1, characterized in that: It also includes a sealing component. The threaded connection between the natural gas connector and the outer sleeve is provided with a sealing component, and the threaded connection between the burner base and the protective sleeve is provided with a sealing component.

10. The low nitrogen burner for anode baking furnace according to any one of claims 1 to 9, characterized in that: A flow divider with an arc-shaped longitudinal section is arranged at the middle position of the spiral nozzle near the end of the gas pipe.

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