CN209726203U - Six channel burner nozzles of one kind and burner - Google Patents

Abstract

The utility model provides a six-channel burner nozzle and a burner. The nozzle is provided with a central axis, an inner air axis, an inner air axis, an outer air axis, an outer air axis and an outer axis from the inside to the outside; The center nozzle hole is set at the end of the central axis; the swirl air channel is between the central axis and the inner air axis, the pulverized coal air channel is between the inner air axis and the inner air axis, and the second air channel is between the inner air axis and the outer air axis. A gas air channel, a second gas air channel between the external air shaft and the external air shaft, and an axial flow air channel between the external air shaft and the external shaft. The axial flow air channel between the external air shaft and the external shaft is used to adjust the flow rate. It only needs to process the external air shaft head into a tapered surface, without the use of a tapered groove. The operation is simple and the cost is low. For burners using gas, no ignition channel is required. In the nozzle using the ignition channel, the oil gun in the ignition channel does not need a high-pressure pipeline, and the cost is low.

Description

A six-channel burner nozzle and burner

technical field

The utility model belongs to the field of gas burners, in particular to a six-channel burner nozzle and a burner.

Background technique

The nozzles of existing pulverized coal burners mostly include fuel injection ports, swirl air ducts, pulverized coal air ducts, and axial flow air ducts from the inside to the outside, and one or more air channels are set according to different actual conditions, such as patent CN106885237A in the burner. The burner for pulverized coal combustion needs special pulverized coal, and the coke oven exhaust gas or converter exhaust gas of existing steel mills or cement plants also needs special treatment. A gas combustion furnace that saves energy, protects the environment and utilizes waste gas is needed.

Pulverized coal combustion requires the fuel injection channel to ignite from the inside through the fuel injection port. For burners using flammable gases such as gas, gas, etc., it is not necessary to ignite from the inside, and can be ignited and burned outside after the gas is ejected. The fuel injection channel and the fuel injection port are not necessary. Existing burners all include an oil injection channel and an oil injection port.

In addition, the method for adjusting the flow rate of the axial flow in the axial flow channel of the existing burner nozzle is as follows: the axial flow channel is formed by the space between the external air shaft and the external shaft arranged outside the external air shaft. Conical grooves are evenly distributed along the outer wall of the outer wind shaft along the circumference, and the cross section of the tapered grooves gradually increases from the head to the tail along the axis of the outer wind shaft. In this way, the outer axis and the outer air axis move back and forth relative to each other, and the cross section of the air outlet changes, thereby adjusting the flow rate of the axial flow air. This method needs to process the tapered groove, and the processing steps of the tapered groove are cumbersome and time-consuming. There is a need for an axial air flow regulating structure with simple manufacture and low cost.

Contents of the invention

The utility model provides a six-channel burner nozzle and a burner.

The purpose of this utility model is achieved in the following manner: a six-channel burner nozzle and a burner, the nozzle is provided with a central axis, an inner air axis, an inner air axis, an outer air axis, an outer air axis and an outer axis from the inside to the outside ; An ignition channel is set inside the central axis, and a central spray hole is set at the end of the central axis; between the central axis and the inner air axis is a swirling air channel, and between the inner air axis and the inner air axis are pulverized coal air channels, the inner air axis and the The first gas air channel is between the external air shafts, the second gas air channel is between the external air shafts and the external air shafts, and the axial flow air channel is between the external air shafts and the external air shafts.

The first gas duct is a converter gas duct, and the second gas duct is a coke oven gas duct.

The front end of the external air shaft is an external air shaft head with a conical outer surface. The front end of the external air shaft head has a large diameter and the rear end has a small diameter. An air outlet groove is arranged along the circumference of the outer air shaft head, and the air outlet groove is a cylindrical hole. In one part, the axis of the air outlet slot is parallel to the axis of the external air shaft.

The front end of the central shaft is provided with a swirl head, and the outer wall of the swirl head is provided with a spiral groove, and a spiral-shaped swirl air channel is formed between the spiral groove and the inner wall of the inner air shaft; as the spiral groove extends toward the nozzle, the cross-sectional area of the spiral groove gradually decreases Small.

The ignition channel is connected to the central pipeline, and an igniter and an oil gun are arranged in the central pipeline. The oil gun includes an outer tube, and the end of the outer tube near the nozzle is provided with a nozzle, and the tail of the outer tube is provided with a high-pressure air inlet. An oil outlet is arranged at the end of the spout, and a mixing chamber is formed between the oil outlet and the spout.

The beneficial effect of the utility model is that: the flow adjustment of the axial flow air channel between the external air shaft and the external shaft only needs to process the external air shaft head into a tapered surface, without the use of a tapered groove, and the operation is simple and the cost is low. For burners using gas, no ignition channel is required. In the nozzle using the ignition channel, the oil gun in the ignition channel does not need a high-pressure pipeline, and the cost is low.

Description of drawings

Figure 1 is an overall schematic diagram of the burner.

Figure 2 is a schematic diagram of the nozzle.

Fig. 3 is a cross-sectional view of the joint part of the nozzle and the air supply duct.

Fig. 4 is a schematic diagram of a swirl wind head.

Fig. 5 is a schematic diagram of the external air shaft head.

Fig. 6 is a schematic diagram of the outer shaft.

Fig. 7 is a sectional view of the oil gun.

Among them, 2 is the nozzle, 20 is the central shaft, 201 is the swirl air head, 202 is the spiral groove, 203 is the central spray hole, 21 is the inner air shaft, 22 is the inner air shaft, 23 is the outer air shaft, and 24 is the outer air Shaft, 25 is the outer shaft, 26 is the pulverized coal air duct, 27 is the first gas air duct, 28 is the second gas air duct, 29 is the axial flow air duct, 240 is the external air shaft head, 241 is the air outlet slot, 30 is the swirling air duct, 31 is the outer pipe, 32 is the nozzle, 33 is the high-pressure air inlet, 34 is the oil outlet pipe, 35 is the oil outlet, 36 is the mixing chamber, 4 is the expansion joint, 5 is the air inlet pipe, 50 is Inner air pipe, 51 is pulverized coal pipe, 52 is inner gas pipe, 53 is outer gas pipe, 54 is outer air pipe, 55 is central pipe, 6 is air pipe, 7 is first branch air pipe, 8 is second Branch air pipe.

Detailed ways

As shown in Figures 1-7, a gas burner nozzle, the nozzle 2 includes two air channels inside and outside; at least one gas channel is arranged between the two air channels. A central axis 20 is arranged at the center of the nozzle 2, and no ignition channel is arranged inside the central axis 20. Compressed air passes through the air duct for combustion support. Combustible gases such as coal gas are passed through the gas air channel for combustion. All existing burners have ignition channels. For a burner that mainly uses gas such as gas to burn, it does not need to be ignited from the inside of the burner, but can be ignited from the outside to achieve sufficient combustion. A burner without an ignition channel can be remade, or the original ignition channel can be blocked. The outer one of the two air ducts may be an axial flow duct, and the inner one may be a cyclone air duct or a vortex air duct. The burner nozzle can have less than two air passages. There are two gas ducts.

In a specific embodiment, the nozzle 2 is provided with a central axis 20 , an inner air axis 21 , an inner air axis 22 , an outer air axis 23 , an outer air axis 24 and an outer axis 25 from inside to outside. Between the central axis 20 and the inner air axis 21 is the swirl air channel 30, between the inner air axis 21 and the inner air axis 22 is the pulverized coal air channel 26, and between the inner air axis 22 and the outer air axis 23 is the first gas wind channel. Between the channel 27 , the external air shaft 23 and the external air shaft 24 is a second gas air duct 28 , and between the external air shaft 24 and the external shaft 25 is an axial flow air duct 29 . The first gas duct 27 and the second gas duct 28 can respectively pass through coke oven gas, converter gas or any one of them. Coke oven gas and converter gas are waste gases from steel mills or cement plants, which can be reused to save resources. Pass coal powder in the pulverized coal passage 26, because gas is many, and pulverized coal is few, also can not use ignition passage to ignite. The outer surface of the central shaft 20 is cylindrical. The inner and outer surfaces of the inner air shaft 21 , the inner air shaft 22 , the outer air shaft 23 and the outer air shaft 24 are all cylindrical and ring-shaped. The inner surface of the outer shaft 25 is cylindrical. The inner and outer cylindrical surfaces of the central axis 20 and the inner wind axis 21 are relatively moved by the telescopic joint 4 of the relative moving device. The inner and outer surfaces of the outer air shaft 24 and the outer shaft 25 are also relatively moved through the telescopic joint 4, thereby adjusting the flow velocity, flow rate and rotation angle of the jetted compressed air.

The front end of the central shaft 20 is provided with a swirl head 201 , and the outer wall of the swirl head 201 is provided with a spiral groove 202 . As the spiral groove 202 extends toward the outlet of the nozzle 2 , the cross-sectional area of the spiral groove 202 gradually decreases. The cross section of the spiral groove 202 is semicircular, and the helix angle of the spiral groove 202 is about 45 degrees. The inner air shaft 21 moves back and forth to adjust the area of the air outlet of the swirl air channel 30, thereby adjusting the flow rate of the compressed air.

An air outlet slot can be arranged on the outer air shaft 24, the air outlet slot is conical, and the diameter of the air outlet slot at the opening of the nozzle 2 is the smallest. This structure is a conventional structure for adjusting the size of the axial flow air outlet, and the conical air outlet groove is not easy to process, and the manufacturing cost is high. A new method for adjusting the flow rate of the air outlet of the axial flow duct can be adopted.

The burner nozzle axial flow air channel structure includes an external air shaft 24 and an outer shaft 25 sheathed outside the external air shaft 24 , and an axial flow air channel 29 is formed between the external air shaft 24 and the external shaft 25 . The front end of the external air shaft 24 is an external air shaft head 240 with a conical outer surface. The front end of the external air shaft head 240 has a large diameter and a small rear end diameter. Both the outer wind shaft 24 and the outer shaft 25 are annular pipes. The front end of the external air shaft 24 refers to the end of the outlet of the axial air duct 29 . The rear end of the external air shaft 24 is cylindrical, and its outer diameter is smaller than that of the external air shaft head 240 . The inner wall of the outer shaft 25 is cylindrical. Between the inner wall of the outer shaft 25 and the outer wall of the outer air shaft 24 is an axial air duct 29 . The air outlet of the axial flow air is the gap between the end face of the outer shaft 25 and the conical inner wall of the outer wind shaft 24 corresponding to the end face of the outer shaft 25 . When the outer shaft 25 and the outer air shaft 24 move back and forth relative to each other, the air outlet of the axial air duct 29 gradually increases or decreases gradually. The external air shaft head 240 only needs to be processed into a tapered surface, which is easy to operate and low in cost. The axial air channel 29 is usually the outermost air channel of the burner nozzle 2 . Of course, it can also be set in other places.

An air outlet slot 241 is arranged on the outer air shaft head 240 along the circumference. The air outlet groove 241 is a part of the air outlet. The air outlet slots 241 are uniformly arranged on the circumference of the outer air shaft head 240 . The air outlet slot 241 is a part of the cylindrical hole, and the axis of the air outlet slot 241 is parallel to the axis of the outer air shaft 24 . The air outlet groove 241 is easy to process. After the tapered surface of the outer air shaft head 240 is removed by the car, as long as a hole is punched along the outer air shaft head 240, the junction of the hole and the outer air shaft head 240 forms the air outlet groove 241. The previously used tapered holes are difficult to machine, costly and time consuming. The current air outlet groove 241 has low processing cost.

The outer wind shaft head 240 also includes a section of cylindrical outer surface, which is connected to the end of the conical outer surface with a larger diameter. In this way, in the initial state, the air outlet of the axial flow duct 29 only includes the air outlet groove 241 . After the outer shaft 25 and the outer air shaft 24 move back and forth, the air outlet becomes larger, including not only the air outlet slot 241 but also the gap between the inner wall of the outer shaft 25 and the outer wall of the outer air shaft 24 .

The front end of the inner wall of the outer shaft 25 is cylindrical and the diameter is larger than that of the rear end of the inner wall of the outer shaft 25, and the two sections of the cylindrical shape are connected by a conical outer surface. If the diameter of the inner wall of the outer shaft 25 is consistent, then when adjusting the flow rate of the axial flow, the front end of the outer shaft 25 needs to be moved to the corresponding position of the conical surface of the outer wind shaft head 241, and there is no obstacle above after the wind rushes out from the air outlet , it is easy to spread outside the outer axis 25 circles. The setting in the utility model, after the wind rushes out from the air outlet, also has the front end of the inner wall of the outer shaft 25 as a barrier, so that the axial flow wind can be moved closer to the circumference of the outer shaft 25 to avoid divergence. Thereby gathering the flame. The cylindrical diameter of the rear end of the inner wall of the outer shaft 25 may be the same as the diameter of the cylindrical outer surface of the outer wind shaft head 241 . The burner nozzle including the above-mentioned axial flow duct is within the protection scope of the present invention, and the axial flow duct is not necessarily the outermost air duct of the burner nozzle.

For a gas burner, no ignition channel may be provided, or an ignition channel may be provided. In the above-mentioned embodiment, add the ignition channel and just become the burner nozzle of six channels. The nozzle 2 is provided with a central axis 20 , an inner air axis 21 , an inner air axis 22 , an outer air axis 23 , an outer air axis 24 and an outer axis 25 from inside to outside. Between the central axis 20 and the inner air axis 21 is the swirl air channel 30, between the inner air axis 21 and the inner air axis 22 is the pulverized coal air channel 26, and between the inner air axis 22 and the outer air axis 23 is the first gas wind channel. Between the channel 27 , the external air shaft 23 and the external air shaft 24 is a second gas air duct 28 , and between the external air shaft 24 and the external shaft 25 is an axial flow air duct 29 .

The difference lies in that: an ignition channel is provided in the central shaft 20, and a central injection hole 203 is provided at the end of the central shaft. Wherein the ignition channel communicates with the central pipe 55 of the burner, and an igniter and an oil gun are arranged in the central pipe 55, and the oil gun includes an outer pipe 31, the end of the outer pipe 31 near the nozzle 2 is provided with a spout 32, and the tail of the outer pipe 31 is provided with a high-pressure air inlet 33. An oil outlet pipe 34 is arranged inside the outer pipe 31, an oil outlet 35 is arranged at the end of the oil outlet pipe 34 near the nozzle 32, and a mixing chamber 36 is formed between the oil outlet 35 and the nozzle.

During specific implementation, the oil enters the mixing chamber 36 from the oil outlet 35 and mixes with the high-pressure air, sprays the atomized oil from the nozzle hole 32, and ignites it with an igniter. The original oil gun does not use compressed air, but pressurizes the oil through a high-pressure pump. Directly feed high-pressure oil, and ignite it with an igniter after the high-pressure oil is sprayed out. The oil gun needs to withstand high pressure and needs to be made of high pressure resistant materials. However, in this embodiment, the oil is not subjected to high pressure, and compressed air is used to atomize the oil, so that low-pressure pipe fittings can be used to reduce costs. The rest of the structure is the same as the technical scheme of the nozzle without ignition channel.

The specific structure of the gas burner using the above-mentioned nozzle is as follows: for a burner without an ignition channel, the air supply pipeline 5 includes an inner air pipeline 50, a pulverized coal pipeline 51, an inner gas pipeline 52, an outer gas pipeline 53 and an outer gas pipeline 53 from the inside to the outside. Air duct 54 . Wherein the inner air pipe 50 is connected with the inner air shaft 21 of the nozzle 2, the pulverized coal pipe 51 is connected with the inner air shaft 22, the inner gas pipe 52 is connected with the outer air shaft 23, the outer gas pipe 53 is connected with the outer air shaft 24, and the outer air pipe 54 links to each other with outer shaft 25. Compressed air is passed through the inner air pipeline 50, pulverized coal is passed between the inner air pipeline 50 and the pulverized coal pipeline 51, converter gas is passed between the pulverized coal pipeline 51 and the inner gas pipeline 52, and converter gas is passed between the inner gas pipeline 52 and the outer gas pipeline 53. Coke oven gas is passed through, and compressed air is passed between the outer gas pipeline 53 and the outer air pipeline 54 . The ventilation positions of coke oven gas and converter gas can be interchanged, or both can be fed with one kind of gas.

For a burner with an ignition channel, an ignition channel is provided inside the central shaft 20, and the air supply duct includes a central pipe 55 communicated with the ignition channel, and oil is passed through the central pipe 55 and ignited. Concrete ignition mechanism can adopt the mode of prior art, also can adopt the structure of oil gun in the utility model.

The telescopic joint 4 is set on the inner air pipeline 50 , and the telescopic joint 4 is set on any one of the outer gas pipeline 53 and the outer air pipeline 54 . It also includes an air pipe 6 connected to the compressed air source, and the air pipe 6 communicates with the inside of the inner air pipe 50 and the inside of the outer air pipe 54 through the first branch air pipe 7 and the second branch air pipe 8; The pulverized coal pipe 9 communicated inside communicates with the two gas inlets inside the inner gas pipeline 52 and the outer gas pipeline 53 .

During specific implementation, the expansion and contraction of the telescopic joint 4 of the inner air duct 50 drives the inner air duct 50 and the inner air shaft 21 to move, thereby adjusting the flow rate of the air outlet of the swirl air duct 30 . The expansion and contraction of the telescopic joint 4 on the outer air duct 54 drives the outer shaft 25 to move to adjust the flow rate of the air outlet of the axial flow duct 29 .

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

Claims (5)

1. A six-channel burner nozzle, characterized in that: the nozzle is provided with a central axis, an inner air axis, an inner air axis, an outer air axis, an outer air axis and an outer axis from the inside to the outside; the ignition is set inside the central axis The center nozzle hole is set at the end of the central axis; the swirl air channel is between the central axis and the inner air axis, the pulverized coal air channel is between the inner air axis and the inner air axis, and the second air channel is between the inner air axis and the outer air axis. A gas air channel, a second gas air channel between the external air shaft and the external air shaft, and an axial flow air channel between the external air shaft and the external shaft. 2. A six-channel burner nozzle according to claim 1, characterized in that: the first gas duct is a converter gas duct, and the second gas duct is a coke oven gas duct. 3. A six-channel burner nozzle according to claim 1, characterized in that: the front end of the external air shaft is an external air shaft with a conical outer surface, the front end of the external air shaft has a large diameter and the rear end has a small diameter , the outer air shaft head is provided with an air outlet slot along the circumference, the air outlet slot is a part of the cylindrical hole, and the axis of the air outlet slot is parallel to the axis of the outer air shaft. 4. A six-channel burner nozzle according to claim 1, characterized in that: the front end of the central shaft is provided with a swirl wind head, a spiral groove is arranged on the outer wall of the swirl flow head, and a spiral groove is formed between the spiral groove and the inner wall of the inner air shaft. Shaped swirl air duct; as the spiral groove extends toward the nozzle, the cross-sectional area of the spiral groove gradually decreases. 5. The burner using any one of the six-channel burner nozzles of claims 1-4, characterized in that: the ignition channel is connected to the central pipe, and an igniter and an oil gun are arranged in the central pipe, and the oil gun includes an outer tube , the end of the outer pipe near the nozzle is provided with a nozzle, the tail of the outer pipe is provided with a high-pressure air inlet, the inside of the outer pipe is provided with an oil outlet, the end of the outlet pipe near the nozzle is provided with an oil outlet, and a mixing chamber is formed between the oil outlet and the nozzle.