Burner for roasting and combustion spray gun

Abstract

The burner comprises a burner body, a first mixing chamber and a second mixing chamber are sequentially arranged in the burner body in the gas conveying direction, a spiral mixing channel is arranged between the first mixing chamber and the second mixing chamber, the first mixing chamber is further connected with a gas input channel and at least one combustion-supporting gas input channel, and the second mixing chamber is further connected with a gas output channel. The gas outlet end of the second mixing chamber is connected with a nozzle through a gas outlet pipe, and electronic ignition contacts are arranged around the nozzle. According to the burner, fuel gas and combustion-supporting gas can be promoted to be fully mixed, fuel gas can be promoted to be fully combusted, the utilization rate of the fuel gas can be increased, meanwhile, the combustion efficiency can be improved, and resource waste and production cost can be reduced. The high-performance combustion spray gun has the advantages of small size, light weight, simple structure, easiness in control, good mixing effect, high combustion efficiency, long service life, good use safety and the like, can be widely used for constructing a high-performance combustion spray gun, and has important promotion significance in promoting wide application of the combustion spray gun in a lithium smelting process.

Description

Technical Field

[0001] The utility model belongs to the technical field of roasting equipment and relates to a burner and a combustion spray gun used for roasting. Background Art

[0002] Lithium carbonate is a key raw material in the lithium battery industry, and demand is steadily increasing. For example, lepidolite, the most common lithium mineral, is one of the primary sources of lithium products. Consequently, processes for producing lithium carbonate using lepidolite as a raw material have garnered significant market attention.

[0003] Combustion lances are commonly used in lithium extraction processes as roasting equipment. Burners provide a heat source for roasting lithium ore, and their performance is directly related to the thermal efficiency of the fuel. Generally speaking, improving thermal efficiency not only increases fuel utilization and reduces smelting costs, but also improves the roasting effect of lithium ore. Therefore, developing a high-performance burner is essential to promote the widespread use of combustion lances in lithium smelting processes.

[0004] At present, the burners commonly used in roasting have only one combustion air mixing chamber or no mixing chamber inside. However, gas mixing through a mixing chamber or simple blowing disturbance makes it difficult to fully mix the combustion gas (such as air) with natural gas, which easily leads to defects such as incomplete combustion, low combustion efficiency, and low natural gas utilization, which in turn easily causes great economic losses and waste of resources. In addition, the burners used for roasting are mainly processed by the following two methods: one is to use a single metal cutting process, which has the following defects: the burner temperature is too high, reaching the ignition point of natural gas, there is a risk of gas backfire, and it is easy to damage the original structure of the burner, shortening its service life; the other is to use metal cutting and fill the nozzle surface or interior with refractory materials. Although this can reduce the operating temperature of the burner, it has disadvantages such as being too large, limited in length, and too high in weight. In addition, the burner is bulky, difficult to operate, or inflexible to control, which is not conducive to flexible control of the combustion atmosphere of the combustion spray gun. Therefore, obtaining a burner and combustion spray gun with small size, light weight, simple structure, easy control, good mixing effect, high combustion efficiency, long service life and high safety of use is of great significance for improving the roasting effect of lithium ore (such as lithium mica) and promoting the widespread application of combustion spray guns in lithium smelting processes. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a burner and a burner suitable for a rotary kiln with small size, light weight, simple structure, easy control, good mixing effect, high combustion efficiency, long service life and good safety in use, in view of the deficiencies in the existing technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0007] A burner for roasting comprises a burner body, wherein a first mixing chamber and a second mixing chamber are sequentially arranged in the burner body along the gas delivery direction, and a spiral mixing channel is provided between the first mixing chamber and the second mixing chamber; the first mixing chamber is also connected to a fuel gas input channel and at least one combustion-supporting gas input channel; the gas outlet end of the second mixing chamber is connected to a nozzle via an gas outlet pipe; and a plurality of electronic ignition contacts are provided around the outer side of the nozzle.

[0008] As a further improvement of the above technical solution: the gas inlet directions of the fuel gas input channel and the combustion-supporting gas input channel are perpendicular to each other.

[0009] As a further improvement of the above technical solution: the gas input channel is transversely arranged in the burner body; the diameter of the gas input channel gradually decreases along the gas transmission direction.

[0010] As a further improvement of the above technical solution: a gas check plate is further provided on the gas outlet of the gas input channel.

[0011] As a further improvement of the above technical solution: the number of the combustion-supporting gas input channels is 1 to 4; the combustion-supporting gas input channels are located in the burner body and surround the first mixing chamber.

[0012] As a further improvement of the above technical solution: the gas input channel is coaxial with the spiral mixing channel, so that the air outlet of the gas input channel faces the air inlet of the second mixing chamber; the air outlet pipe is horizontally arranged in the burner body.

[0013] As a further improvement of the above technical solution: a spiral blade is provided in the spiral mixing channel.

[0014] The number of the electronic ignition contacts is 1 to 4; the electronic ignition contacts are arranged around the nozzle.

[0015] As a further improvement of the above technical solution: a cooling mechanism is further provided in the burner body, and the cooling mechanism includes a cooling chamber, which surrounds the air outlet pipe and the nozzle; the cooling chamber is also connected to a coolant outlet pipe and a coolant inlet pipe.

[0016] As a further improvement of the above technical solution: when cooling is required, a coolant is introduced into the cooling chamber, and circulated in the cooling chamber through the coolant inlet pipe and the coolant outlet pipe; the coolant is water.

[0017] As a general technical concept, the present invention also provides a combustion spray gun, which includes the above-mentioned burner.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) In the burner of the present invention, a mixing chamber No. 1 and a mixing chamber No. 2 are sequentially provided in the burner body along the gas delivery direction, a spiral mixing channel is provided between the mixing chamber No. 1 and the mixing chamber No. 2, a fuel gas input channel and at least one combustion-supporting gas input channel are also connected to the mixing chamber No. 1, a nozzle is connected to the gas outlet end of the mixing chamber No. 2 through an gas outlet pipe, and a plurality of electronic ignition contacts are provided around the outer side of the nozzle. Before ignition, the fuel gas and the combustion-supporting gas enter the No. 1 mixing chamber through the fuel gas input channel and the combustion-supporting gas input channel respectively, complete the first mixing in the No. 1 mixing chamber, and then enter the No. 2 mixing chamber through the spiral mixing channel. At this time, the spiral structure in the spiral mixing channel can be used to change the flow direction and process of the gas, which can not only effectively prevent the high-speed gas that is not fully mixed in the No. 1 mixing chamber from directly entering the No. 2 mixing chamber, but also promote the full mixing of the gas, thereby completing the second mixing in the spiral mixing channel. At the same time, under the action of the spiral mixing channel, the mixed gas enters the No. 2 mixing chamber in a rotating manner, and can also complete the third mixing in the No. 2 mixing chamber, ultimately allowing the fuel gas and combustion-supporting gas entering the No. 2 mixing chamber to be fully mixed. Furthermore, as the mixed gas fills the No. 2 mixing chamber, the mixed gas will be ejected from the nozzle through the outlet pipe, which is conducive to controlling the direction and length of the flame during combustion. Finally, under the action of the electronic ignition contact, the mixed gas ejected from the nozzle is ignited to form a jet flame. In addition, under the action of the spiral mixing channel, the mixed gas can be effectively prevented from being heated and tempered, thereby improving the safety of use; at the same time, the electronic ignition contacts used can improve the ignition efficiency and reduce the risk of manual ignition operation. In addition, in the present invention, the various pipelines and mixing chambers are reasonably distributed inside the burner body, which not only has a simple structure and is easy to operate, but also can effectively reduce the volume of the burner and reduce the overall weight of the burner. The burner of the present invention can promote the full mixing of the fuel gas and the combustion-supporting gas, promote the full combustion of the fuel gas, improve the combustion efficiency while improving the gas utilization rate, and help reduce resource waste and production costs. It has the advantages of small size, light weight, simple structure, easy control, good mixing effect, and high combustion efficiency. It can be widely used to construct high-performance combustion spray guns, which is of great significance for improving the roasting effect of lithium ore (such as lithium mica) and promoting the widespread application of combustion spray guns in lithium smelting processes.

[0020] (2) In the burner of the present invention, the air inlet directions of the gas input channel and the combustion-supporting gas input channel are perpendicular to each other, that is, the gas and the combustion-supporting gas intersect at 90 degrees and enter the No. 1 mixing chamber, which can accelerate the collision of the intersecting airflows, enhance the airflow disturbance, and promote the mixing of the combustion-supporting gas (such as air) and the gas (such as natural gas); at the same time, the gas input channel is arranged horizontally in the burner body, and its pipe diameter is optimized so that the gas transmission direction becomes gradually smaller. The gas input channel can be used to compress the gas and increase the gas flow rate, thereby promoting the airflow disturbance in the No. 1 mixing chamber, which is more conducive to achieving sufficient mixing of the gas; in addition, a gas check plate is also provided on the air outlet of the gas input channel. On the one hand, it can prevent the disturbance turbulence from countercurrent and increase the safety of use. On the other hand, it can also increase the combustion-supporting air flow rate by reducing the diameter, enhance the airflow disturbance in the No. 1 mixing chamber, and promote mixing.

[0021] (3) In the burner of the present invention, the gas input channel is coaxial with the spiral mixing channel, so that the gas outlet of the gas input channel is directly opposite to the gas inlet of the No. 2 mixing chamber. The combustion-supporting air with a relatively high wind pressure output from the gas input channel can be used to promote the mixed gas in the No. 1 mixing chamber to enter the spiral mixing channel. The spiral mixing channel can then be used to change the flow direction and stroke of the gas to promote sufficient mixing of the gas, thereby effectively preventing the mixed gas from entering the No. 2 mixing chamber without being fully mixed.

[0022] (4) In the burner of the present invention, a cooling mechanism is also provided in the burner body. The cooling mechanism includes a cooling chamber, and the cooling chamber surrounds the air outlet pipe and the nozzle. During formal operation, the coolant is introduced into the cooling chamber and circulated in the cooling chamber through the coolant inlet pipe and the coolant outlet pipe. In this way, the coolant can be used to exchange heat with the air outlet pipe and the nozzle, thereby reducing the operating temperature of the flame outlet end. This not only prevents high-temperature gas from damaging the nozzle, which is beneficial to improving the service life, but also effectively prevents the high-temperature mixed gas from burning prematurely, which is beneficial to increasing the safety of use. In addition, arranging the cooling mechanism in the burner body is also beneficial to reducing the volume and weight of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0024] Figure 1 This is a schematic cross-sectional view of a burner used for roasting in Example 1 of the present invention.

[0025] Figure 2 This is a schematic structural diagram of the spiral mixing channel in Example 1 of the present utility model.

[0026] Legend:

[0027] 1. Gas input channel; 2. Gas check plate; 3. Combustion-supporting gas input channel; 4. Mixing chamber No. 1; 5. Spiral mixing channel; 6. Coolant outlet pipe; 7. Mixing chamber No. 2; 8. Nozzle; 9. Electronic ignition contact; 10. Coolant inlet pipe; 11. Cooling chamber. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0029] The materials and instruments used in the following examples are all commercially available.

[0030] Example 1:

[0031] like Figure 1 As shown, the burner for roasting in this embodiment includes a burner body, in which a mixing chamber No. 1 4 and a mixing chamber No. 2 7 are sequentially provided along the gas delivery direction, and a spiral mixing channel 5 is provided between the mixing chamber No. 1 4 and the mixing chamber No. 2 7; the mixing chamber No. 1 4 is also connected to a fuel gas input channel 1 and a combustion-supporting gas input channel 3; the gas outlet end of the mixing chamber No. 2 7 is connected to a nozzle 8 through an outlet pipe; two electronic ignition contacts 9 are provided around the outer side of the nozzle 8.

[0032] In this embodiment, before ignition, the fuel gas and the combustion-supporting gas enter the No. 1 mixing chamber through the fuel gas input channel and the combustion-supporting gas input channel respectively, complete the first mixing in the No. 1 mixing chamber, and then enter the No. 2 mixing chamber through the spiral mixing channel. At this time, the spiral structure in the spiral mixing channel can be used to change the flow direction and process of the gas, which can not only effectively prevent the high-speed gas that is not fully mixed in the No. 1 mixing chamber from directly entering the No. 2 mixing chamber, but also promote the full mixing of the gas, thereby completing the second mixing in the spiral mixing channel. At the same time, under the action of the spiral mixing channel, the mixed gas enters the No. 2 mixing chamber in a rotating manner, and can also complete the third mixing in the No. 2 mixing chamber, ultimately allowing the fuel gas and combustion-supporting gas entering the No. 2 mixing chamber to be fully mixed. Furthermore, as the mixed gas fills the No. 2 mixing chamber, the mixed gas will be ejected from the nozzle through the outlet pipe, which is conducive to controlling the direction and length of the flame during combustion. Finally, under the action of the electronic ignition contact, the mixed gas ejected from the nozzle is ignited to form a jet flame. The spiral mixing channel also effectively prevents backfire of the mixed gas due to heat, improving operational safety. Furthermore, the electronic ignition contacts improve ignition efficiency and reduce the risks of manual ignition. Furthermore, the various pipes and mixing chambers in this utility model are strategically located within the burner body, simplifying the structure and facilitating operation while also effectively reducing the burner's volume and overall weight.

[0033] In this embodiment, the air intake directions of the fuel gas input channel 1 and the combustion-supporting gas input channel 3 are perpendicular to each other, that is, the fuel gas and the combustion-supporting gas intersect at 90 degrees and enter the No. 1 mixing chamber, which can accelerate the collision of the intersecting airflows, enhance the airflow disturbance, and promote the mixing of the combustion-supporting gas (such as air) and the fuel gas (such as natural gas).

[0034] In this embodiment, the gas input channel 1 is horizontally arranged in the burner body, and the diameter of the gas input channel 1 gradually decreases along the gas transmission direction. Specifically, the gas input channel 1 includes at least two sections of pipes with gradually decreasing diameters in the gas transmission direction. Therefore, the gas input channel 1 can be used to compress the gas and increase the gas flow rate, thereby promoting airflow disturbance in the No. 1 mixing chamber, which is more conducive to achieving sufficient mixing of the gas.

[0035] In this embodiment, a gas check plate 2 is also provided on the gas outlet of the gas input channel 1. On the one hand, it can prevent the disturbance of turbulent flow and the occurrence of backflow, thereby increasing the safety of use. On the other hand, it can also increase the combustion air flow rate by reducing the diameter, enhance the airflow disturbance in the No. 1 mixing chamber, and promote mixing.

[0036] In this embodiment, the combustion-supporting gas input channel 3 is arranged in the burner body and is located above the first mixing chamber 4 .

[0037] In this embodiment, the gas input channel 1 is coaxial with the spiral mixing channel 5, so that the air outlet of the gas input channel 1 is opposite to the air inlet of the No. 2 mixing chamber 7. The combustion-supporting air with a relatively high wind pressure output from the gas input channel can be used to promote the mixed gas in the No. 1 mixing chamber to enter the spiral mixing channel. The spiral mixing channel can then be used to change the flow direction and stroke of the gas to promote sufficient mixing of the gas, thereby effectively preventing the mixed gas from entering the No. 2 mixing chamber without being fully mixed.

[0038] In this embodiment, the air outlet pipe is arranged transversely in the burner body.

[0039] like Figure 2 As shown, in this embodiment, spiral blades are provided within the spiral mixing channel 5. Specifically, a solid tube is disposed on the central axis of the spiral mixing channel 5, and the spiral blades are connected around the solid tube, thereby forming a spiral channel within the spiral mixing channel 5, causing the gas to spirally advance along the spiral channel formed by the spiral blades. The solid tube and the spiral blades can be directly connected by welding. In this embodiment, the spiral blades provided within the spiral mixing channel 5 not only change the flow direction of the gas but also increase the gas travel distance.

[0040] In this embodiment, the electronic ignition contacts 9 are arranged around the nozzle 8 and fixed on the burner body. The electronic ignition contacts can improve the ignition efficiency and reduce the risk of manual ignition operation.

[0041] In this embodiment, a cooling mechanism is further provided in the burner body, and the cooling mechanism includes a cooling chamber 11 . The cooling chamber 11 surrounds the air outlet pipe and the nozzle 8 , and is connected to the cooling chamber 11 with a coolant outlet pipe 6 and a coolant inlet pipe 10 .

[0042] In this embodiment, when cooling is required, the coolant is introduced into the cooling chamber 11 and circulated in the cooling chamber 11 through the coolant inlet pipe 10 and the coolant outlet pipe 6; the coolant is water.

[0043] In this embodiment, a cooling mechanism is provided within the burner body. During full operation, coolant is introduced into the cooling chamber and circulated within the chamber via a coolant inlet pipe and a coolant outlet pipe. This allows the coolant to exchange heat with the gas outlet pipe and nozzle, lowering the operating temperature at the flame outlet. This not only prevents high-temperature gas from damaging the nozzle, thereby increasing its service life, but also effectively prevents premature combustion of the high-temperature mixed gas, thereby increasing operational safety. Furthermore, placing the cooling mechanism within the burner body also helps reduce the burner's size and weight.

[0044] This embodiment also includes using the above-mentioned nozzle to construct a combustion spray gun.

[0045] Compared with conventional burners used for roasting, the burner of the utility model can promote the full mixing of fuel gas and combustion-supporting gas, promote the full combustion of fuel gas, improve the combustion efficiency while improving the utilization rate of fuel gas, and help reduce resource waste and production costs. It has the advantages of small size, light weight, simple structure, easy control, good mixing effect, high combustion efficiency, long service life, and good safety in use. It can be widely used to construct high-performance combustion spray guns, which is of great significance for improving the roasting effect of lithium ore (such as lithium mica) and promoting the widespread application of combustion spray guns in lithium smelting processes.

[0046] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent replacement, equivalent change and modification of the above embodiments made according to the technical essence of the present invention, which does not depart from the content of the technical solution of the present invention, still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A burner for roasting, characterized in that: The burner comprises a burner body, wherein a first mixing chamber (4) and a second mixing chamber (7) are sequentially arranged in the burner body along the gas delivery direction, and a spiral mixing channel (5) is arranged between the first mixing chamber (4) and the second mixing chamber (7); the first mixing chamber (4) is also connected to a gas input channel (1) and at least one combustion-supporting gas input channel (3); the gas outlet end of the second mixing chamber (7) is connected to a nozzle (8) through an outlet pipe; and a plurality of electronic ignition contacts (9) are arranged around the outer side of the nozzle (8).

2. The burner according to claim 1, characterized in that The gas inlet directions of the fuel gas input channel (1) and the combustion-supporting gas input channel (3) are perpendicular to each other.

3. The burner according to claim 2, characterized in that The gas input channel (1) is transversely arranged in the burner body; the diameter of the gas input channel (1) gradually decreases along the gas transmission direction; and a gas check plate (2) is also provided on the gas outlet of the gas input channel (1).

4. The burner according to claim 2, characterized in that The number of the combustion-supporting gas input channels (3) is 1 to 4; the combustion-supporting gas input channels (3) are located in the burner body and surround the first mixing chamber (4).

5. The burner according to claim 4, characterized in that The gas input channel (1) is coaxial with the spiral mixing channel (5), so that the gas outlet of the gas input channel (1) faces the gas inlet of the second mixing chamber (7); the gas outlet pipe is arranged transversely in the burner body.

6. The burner according to claim 5, characterized in that The spiral mixing channel (5) is provided with spiral blades.

7. The burner according to claim 1, characterized in that The number of the electronic ignition contacts (9) is 1 to 4; the electronic ignition contacts (9) are arranged around the nozzle (8).

8. The burner according to any one of claims 1 to 7, characterized in that A cooling mechanism is also provided in the burner body, and the cooling mechanism includes a cooling chamber (11). The cooling chamber (11) surrounds the air outlet pipe and the nozzle (8); the cooling chamber (11) is also connected to a coolant outlet pipe (6) and a coolant inlet pipe (10).

9. The burner according to claim 8, characterized in that When cooling is required, a coolant is introduced into the cooling chamber (11), and the coolant is circulated in the cooling chamber (11) through the coolant inlet pipe (10) and the coolant outlet pipe (6); the coolant is water.

10. A combustion spray gun, characterized in that: The combustion lance comprises the burner according to any one of claims 1 to 9.

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