Rotary kiln combustor for efficiently combusting pulverized coal

Abstract

The utility model discloses a rotary kiln burner for efficiently burning pulverized coal, which comprises a nozzle head, and the nozzle head comprises an oil gun ring pipe, a central air ring pipe, a rotational flow air ring pipe, a coal air ring pipe and an outer shaft air ring pipe which are sequentially and coaxially sleeved from inside to outside. An end face sealing plate is arranged at the positions, located at the output ends of the oil gun ring pipe, the center air ring pipe, the rotational flow air ring pipe and the coal air ring pipe, of the nozzle head, and an oil gun channel communicated with the oil gun ring pipe is formed in the center of the end face sealing plate; a plurality of center air hole channels communicating with the center air ring pipe are formed in the end face sealing plate in the circumferential direction of the center air ring pipe at intervals, and a plurality of rotational flow air hole channels communicating with the rotational flow air ring pipe are formed in the end face sealing plate in the circumferential direction of the rotational flow air ring pipe at intervals. A plurality of coal air hole channels communicated with the coal air ring pipe are formed in the end face sealing plate in the circumferential direction of the coal air ring pipe at intervals, and a plurality of outer axial air hole channels communicated with the outer axial air ring pipe are formed in the positions, located on the peripheries of all the coal air hole channels, of the end face sealing plate.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production devices, in particular to a rotary kiln burner for efficient combustion of coal powder. Background Art

[0002] Cement is a basic building material, and continuously reducing energy consumption during its production process is crucial to the sustainable development of the cement industry. At present, cement production mainly relies on coal powder combustion to provide heat for clinker formation reaction. Coal powder is added through burners at two locations, the decomposition furnace and the rotary kiln. The rotary kiln burner has developed from the early single-channel to the current multi-channel. It has always been aimed at strengthening the mixing of coal powder and secondary high-temperature air and forming a strong flame shape. In the multi-channel era, various forms of burners have been born and actually used. In the traditional multi-channel burner form, axial flow air, swirl air, and coal air are all single-channel forms. The air volume is adjusted by the regulating valves of each air duct. There are problems such as inaccurate air volume adjustment and insufficient mixing of air between air ducts.

[0003] The prior art with patent number CN211977552U discloses a cement rotary kiln coal powder oxygen-enriched burner, which is designed with double axial flow air channels, and the inner axial flow air channel and the outer axial flow air channel are respectively placed in the inner ring and the outer ring of the coal powder air channel, and the outer axial flow air channel can wrap the coal powder from the outside so that the coal powder wind can continue to maintain the jet direction and move forward until it is completely burned after entering the rotary kiln, and ensure that the flame does not spread outward. However, the outer axial flow wind does not wrap the coal powder wind from the outside, resulting in a low degree of mixing between the outer axial flow wind and the coal wind, and the mixing degree of the high-temperature secondary air sucked by the axial flow wind is also low, which will affect the combustion efficiency of the coal powder. Summary of the invention

[0004] The utility model aims to solve at least one of the above-mentioned technical problems and provides a rotary kiln burner for efficient combustion of pulverized coal. The outer axial wind channel is arranged around the outer periphery of the coal wind channel to enhance the mixing degree of axial flow wind and coal wind.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A rotary kiln burner for efficient combustion of pulverized coal, comprising a nozzle head, the nozzle head comprising an oil gun ring tube, a central air ring tube, a swirl air ring tube, a coal air ring tube and an outer shaft air ring tube which are coaxially sleeved in sequence from the inside to the outside, the nozzle head is provided with an end face sealing plate at the output end of the oil gun ring tube, the central air ring tube, the swirl air ring tube and the coal air ring tube, an oil gun channel connected to the oil gun ring tube is provided at the center position of the end face sealing plate, and the end face sealing plate is provided with a plurality of sealing plates at intervals along the circumference of the central air ring tube. There are several central wind channels connected to the central wind ring tube, several swirl wind channels connected to the swirl wind ring tube are arranged at intervals along the circumference of the swirl wind ring tube on the end face sealing plate, several coal wind channels connected to the coal wind ring tube are arranged at intervals along the circumference of the coal wind ring tube on the end face sealing plate, several outer shaft wind channels connected to the outer shaft wind ring tube are arranged on the end face sealing plate at positions located at the periphery of all the coal wind channels, and any of the coal wind channels can be surrounded by the outer shaft wind channels on its periphery.

[0007] As an improvement of the above technical solution, the outer shaft wind channel includes an intermediate surrounding shaft wind channel, and the end face sealing plate is provided with a plurality of intermediate surrounding shaft wind channels at a position between two adjacent groups of the coal wind channels.

[0008] As an improvement of the above technical solution, the outer shaft wind duct includes a surrounding shaft wind duct, and the end face sealing plate is provided with an outer shaft wind ring head at the outer periphery of all the coal wind ducts, and all the outer shaft wind ring heads are provided with a plurality of surrounding shaft wind ducts connected to the outer shaft wind ring tube at intervals along the circumferential direction.

[0009] As an improvement of the above technical solution, the central air ring tube is provided with concentrically arranged inner and outer circular channels, and a plurality of central air channels are respectively and spaced apart at positions corresponding to the circumferential directions of the end face sealing plates and the inner and outer circular channels, and the central air channels on the inner circular channel and the central air channels on the outer circular channel are staggered with each other.

[0010] As an improvement of the above technical solution, a plurality of the swirl air channels are spaced apart and arranged at positions corresponding to the circumferential direction of the outer circle of the end face sealing plate and the swirl air ring tube.

[0011] As an improvement of the above technical solution, a cyclone is provided inside the output end of all the swirl air ducts.

[0012] As an improvement of the above technical solution, the output ends of all the oil gun channels, central air channels, swirl air channels, coal air channels and outer shaft air channels are arranged parallel to the central axis of the nozzle head.

[0013] As an improvement of the above technical solution, a smoke hood is sleeved on the outer ring of the coal-air ring pipe.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] The utility model discloses a rotary kiln burner for efficient combustion of pulverized coal. The central air channel, swirl air channel, coal air channel and outer axial air channel of the burner nozzle head are all in the form of small air channels, which can accurately adjust the air volume. Among them, the outer axial air channel is arranged around the periphery of the coal air channel, which can enhance the mixing degree of axial flow wind and coal air, and enhance the mixing degree of high-temperature secondary air sucked by the axial flow wind, which is conducive to the extremely efficient combustion of pulverized coal. The swirl air channel is also arranged in the form of small air channels at intervals. Under the advantages of the above, the cross-sectional mixing degree of the coal air is further effectively and accurately enhanced, which is conducive to adjusting the flame shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 for Figure 1 A cross-sectional view of

[0019] Figure 3 The structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 4 The structure of the embodiment of the utility model is shown in FIG. Figure 3 . DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] like Figures 1 to 4 As shown, the utility model provides a rotary kiln burner for efficient combustion of pulverized coal, including a nozzle head, the nozzle head including an oil gun ring tube 10, a central air ring tube 20, a swirl air ring tube 30, a coal air ring tube 40 and an outer shaft air ring tube 50 which are coaxially sleeved in sequence from the inside to the outside, the nozzle head is provided with an end face sealing plate 60 at the output end of the oil gun ring tube 10, the central air ring tube 20, the swirl air ring tube 30 and the coal air ring tube 40, an oil gun channel 11 connected to the oil gun ring tube 10 is opened at the center position of the end face sealing plate 60, and the end face sealing plate 60 is provided with an oil gun channel 11 connected to the oil gun ring tube 1 ... A number of central wind channels 21 connected to the central wind ring tube 20 are arranged at circumferential intervals on the end face sealing plate 60, and a number of swirl wind channels 31 connected to the swirl wind ring tube 30 are arranged at circumferential intervals on the end face sealing plate 60, and a number of coal wind channels 41 connected to the coal wind ring tube 40 are arranged at circumferential intervals on the end face sealing plate 60, and a number of outer shaft wind channels connected to the outer shaft wind ring tube 50 are arranged on the outer periphery of all the coal wind channels 41 on the end face sealing plate 60, and any of the coal wind channels 41 can be surrounded by the outer shaft wind channels on its outer periphery. This burner can use not only coal powder, but also other types of fuels, such as petroleum coke, natural gas, hydrogen energy, etc. Petroleum coke produces very few pollutants when burned and has good combustion characteristics. Natural gas is also a clean fuel and has the advantages of convenient storage and transportation and easy adjustment. Hydrogen energy is also a clean low-carbon fuel, which can be selected according to actual conditions.

[0025] The oil gun channel 11 is located at the center of the nozzle head, and the oil gun can be inserted for ignition; all the central air ducts 21, swirl air ducts 31, coal air ducts 41 and outer shaft air ducts are in the form of small air ducts, which can accurately adjust the air volume; and the output ends of all the oil gun channels 11, central air ducts 21, swirl air ducts 31, coal air ducts 41 and outer shaft air ducts are arranged parallel to the central axis of the nozzle head. A smoke hood 12 is sleeved on the outer ring of the coal air ring pipe 40.

[0026] See also Figure 1In a specific embodiment of the present application, the outer axial wind channel includes an intermediate surrounding axial wind channel 51, and the end face sealing plate 60 is provided with a plurality of intermediate surrounding axial wind channels 51 at the position between two adjacent groups of the coal wind channels 41. At this time, the intermediate surrounding axial wind channels 51 can be arranged in a group of three, and a group of intermediate surrounding axial wind channels 51 is arranged between any two adjacent groups of the coal wind channels 41, and two intermediate surrounding axial wind channels 51 in one group are located on the outer circle formed by the coal wind channels 41, and another intermediate surrounding axial wind channel 51 in one group is located on the central circle formed by the coal wind channels 41, so that the outer axial wind can wrap the coal powder from the outer periphery of both sides of the coal wind channels 41. Of course, the number of intermediate surrounding axial wind channels 51 arranged between two adjacent groups of the coal wind channels 41 can also be adjusted according to the spacing distance between the two adjacent groups of the coal wind channels 41.

[0027] See also Figure 3 In another specific embodiment of the present application, the outer shaft wind channel includes a surrounding shaft wind channel 52, and the end face sealing plate 60 is provided with an outer shaft wind ring head 53 at a position located at the periphery of all the coal wind channels 41, and all the outer shaft wind ring heads 53 are provided with a plurality of surrounding shaft wind channels 52 connected to the outer shaft wind ring tube 50 at intervals along the circumferential direction. The surrounding shaft wind channel 52 can be a small circular channel. That is, the surrounding shaft wind channel 52 is arranged at intervals around the periphery of the coal wind channel 41.

[0028] See also Figure 4 In another specific embodiment of the present application, an intermediate surrounding axial wind channel 51 and a surrounding axial wind channel 52 can also be provided simultaneously to further enhance the mixing degree of the axial flow wind and the coal wind.

[0029] In a specific embodiment of the present application, the central air ring tube 20 is provided with a concentrically arranged inner circular channel and outer circular channel, and a plurality of the central air channels 21 are spaced apart at positions of the end face sealing plate 60 corresponding to the circumferential direction of the inner circular channel and the outer circular channel, and the central air channels 21 on the inner circular channel and the central air channels 21 on the outer circular channel are staggered with each other. Among them, the central air channel 21 adopts a small circular channel, which is wrapped on the periphery of the oil gun channel 11, and can provide the coal powder with the oxygen required for initial combustion. Heavy oil or dry powdered biofuel can be passed into the central air channel for combustion, and oxygen-rich gas can also be passed through the central air channel.

[0030] In the specific implementation of the present application, a plurality of the swirl air ducts 31 are arranged at intervals at positions corresponding to the circumferential direction of the outer circle of the end face sealing plate 60 and the swirl air ring tube 30. The swirl air duct 31 adopts a small semicircular channel; it is arranged on the outer circle and can quickly contact the coal powder. In addition, a cyclone is arranged inside the output end of all the swirl air ducts 31 to achieve the purpose of breaking up the coal powder. The cyclone can adopt existing technology, and can also adopt existing swirl blades.

[0031] The utility model discloses a rotary kiln burner for efficient combustion of pulverized coal. The central air channel 21, the swirl air channel 31, the coal air channel 41 and the outer axial air channel 50 of the burner nozzle head are all in the form of small air channels, which can accurately adjust the air volume. Among them, the outer axial air channel 50 is arranged around the periphery of the coal air channel 41, which can enhance the mixing degree of the axial flow wind and the coal air, and enhance the mixing degree of the high-temperature secondary air sucked by the axial flow wind, which is conducive to the extremely efficient combustion of pulverized coal. The swirl air channel 31 is also arranged in the form of small air channels, which further effectively and accurately enhances the cross-sectional mixing degree with the coal air under the advantages of the above, which is conducive to adjusting the flame shape.

[0032] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. Any modification or equivalent substitution that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A rotary kiln burner for efficient combustion of pulverized coal, characterized in that: The nozzle head comprises an oil gun ring tube, a central air ring tube, a swirl air ring tube, a coal air ring tube and an outer shaft air ring tube which are coaxially sleeved in sequence from the inside to the outside, the nozzle head is provided with an end face sealing plate at the output ends of the oil gun ring tube, the central air ring tube, the swirl air ring tube and the coal air ring tube, an oil gun channel connected to the oil gun ring tube is opened at the center position of the end face sealing plate, a plurality of central air ducts connected to the central air ring tube are arranged at intervals along the circumference of the central air ring tube on the end face sealing plate, a plurality of swirl air ducts connected to the swirl air ring tube are arranged at intervals along the circumference of the swirl air ring tube on the end face sealing plate, a plurality of coal air ducts connected to the coal air ring tube are arranged at intervals along the circumference of the coal air ring tube on the end face sealing plate, a plurality of outer shaft air ducts connected to the outer shaft air ring tube are arranged on the end face sealing plate at the periphery of all the coal air ducts, and any of the coal air ducts can be surrounded by the outer shaft air ducts on its periphery.

2. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: The outer axial wind duct includes an intermediate surrounding axial wind duct, and the end face sealing plate is provided with a plurality of intermediate surrounding axial wind ducts at a position between two adjacent groups of the coal wind ducts.

3. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: The outer shaft wind duct includes a surrounding shaft wind duct, and the end face sealing plate is provided with an outer shaft wind ring head at the periphery of all the coal wind ducts, and all the outer shaft wind ring heads are provided with a plurality of surrounding shaft wind ducts connected to the outer shaft wind ring pipe at intervals along the circumferential direction.

4. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: The central air ring tube is provided with a concentrically arranged inner circular channel and an outer circular channel, and a plurality of central air channels are spaced apart at positions corresponding to the circumferential directions of the end face sealing plate and the inner circular channel and the outer circular channel, and the central air channels on the inner circular channel and the central air channels on the outer circular channel are staggered with each other.

5. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: The plurality of swirl air ducts are respectively arranged at intervals at positions corresponding to the circumferential direction of the end face sealing plate and the outer circle of the swirl air ring tube.

6. A rotary kiln burner for efficient combustion of pulverized coal according to claim 4, characterized in that: A cyclone is arranged inside the output end of all the swirl air channels.

7. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: The output ends of all the oil gun channels, the central air channels, the swirl air channels, the coal air channels and the outer shaft air channels are arranged parallel to the central axis of the nozzle head.

8. A rotary kiln burner for efficient combustion of pulverized coal according to claim 1, characterized in that: A smoke hood is sleeved on the outer ring of the coal-air ring pipe.

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