A rotary kiln burner

Abstract

The application discloses a rotary kiln burner and relates to the field of rotary kilns.The rotary kiln burner comprises a central pipe, an inner air pipe, an outer air pipe and an outer shell which are sequentially arranged from inside to outside, a first inner pipe is arranged in the inner air pipe, and a second inner pipe is arranged in the outer air pipe; a biomass fuel air channel is formed between the central pipe and the first inner pipe, an inner air channel is formed between the first inner pipe and the inner air pipe, a plurality of first rotatable nozzles are sequentially arranged in the circumferential direction at the head end of the inner air channel, a pulverized coal air channel is formed between the inner air pipe and the second inner pipe, an outer air channel is formed between the second inner pipe and the outer air pipe, and a plurality of second rotatable nozzles are sequentially arranged in the circumferential direction at the head end of the outer air channel.The rotary kiln burner solves the problem that, when mixed fuel is used for production in a rotary kiln, biomass fuel is trapped in the cyclone at the front part of the rotary kiln burner, a sintering zone is close to the kiln head, the length of the sintering zone is short, the temperature of the sintering zone is low, the kiln condition is unstable, the combustion efficiency is reduced, and the output and quality of clinker are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rotary kiln, in particular to a rotary kiln burner. BACKGROUND

[0002] At present, applying biomass fuel to cement rotary kiln production of clinker is one of the most promising methods to reduce greenhouse gas emissions and improve energy efficiency.

[0003] However, the traditional rotary kiln burner only has an independent pulverized coal channel for spraying pulverized coal into the kiln, and the biomass fuel needs to be sprayed into the kiln through the ignition oil pipe channel at the center position of the burner. The ignition channel is one or more circular hole-shaped channels with a large radius. Directly spraying biomass fuel from the ignition channel will cause uneven fuel injection rate and the phenomenon that the combustion position is closer to the kiln head.

[0004] In addition, the wind speed of the ignition channel is slower than that of the primary center channel, and the primary air has an axial direction angle, which causes the ignition channel and the primary air channel to easily form a rotational flow, so that more biomass fuel is concentrated in a position close to the burner, and the combustion position is closer to the kiln head than that of the pulverized coal. This will change the distribution of the kiln temperature, reduce the combustion efficiency, and cause the clinker production efficiency and quality to decline, and other adverse consequences, so that the mixed fuel cannot be used stably for cement clinker production. SUMMARY

[0005] To solve the above technical problems, the present application provides a rotary kiln burner, which solves the problem that the burning zone is close to the kiln head, the length is short, and the temperature is low, which leads to unstable kiln conditions, reduced combustion efficiency, and reduced clinker production efficiency and quality.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The rotary kiln burner comprises a center pipe, an inner air pipe, an outer air pipe and an outer shell which are sequentially sleeved from inside to outside, the outer air pipe extends to the outside through the tail end of the outer shell, the inner air pipe extends to the outside through the tail end of the outer air pipe, the center pipe extends to the outside through the tail end of the inner air pipe, the inner air pipe is sleeved with a first inner pipe inside and the first inner pipe is sleeved outside the center pipe, the outer air pipe is sleeved with a second inner pipe inside and the second inner pipe is sleeved outside the inner air pipe, a priming oil pipe is arranged inside the center pipe, the tail end of the priming oil pipe is used for being connected with a fuel oil conveying pipeline, the head end of the priming oil pipe is provided with an oil gun, a biomass fuel air duct is formed between the center pipe and the first inner pipe, an inner air duct is formed between the first inner pipe and the inner air pipe, a plurality of first rotatable nozzles are sequentially arranged on the head end of the inner air duct in a circumferential direction, a pulverized coal air duct is formed between the inner air pipe and the second inner pipe, an outer air duct is formed between the second inner pipe and the outer air pipe, a plurality of second rotatable nozzles are sequentially arranged on the head end of the outer air duct in a circumferential direction, a biomass fuel air pipe and an inner air inlet pipe are arranged on the outer wall of the inner air pipe, the biomass fuel air pipe is connected with the biomass fuel air duct, the inner air inlet pipe is connected with the inner air duct, a pulverized coal air pipe and an outer air inlet pipe are arranged on the outer wall of the outer air pipe, the pulverized coal air pipe is connected with the pulverized coal air duct, and the outer air inlet pipe is connected with the outer air duct.

[0008] Preferably, a first circular ring block is fixed inside the head end of the inner air duct, a plurality of first axial holes are sequentially arranged on the first circular ring block in a circumferential direction, the first rotatable nozzle comprises a first spherical nozzle, a first circular truncated cone baffle, a cylindrical nozzle, a first circular ring baffle, a first fixed ring and a plurality of first locking screws, the head end and the tail end of the first spherical nozzle are respectively provided with the cylindrical nozzle and the first circular truncated cone baffle, a spiral air fin is arranged in the cylindrical nozzle, one first circular ring baffle is fixed inside the head end of each first axial hole, the first spherical nozzle can abut against the inner wall of the first circular ring baffle, the first fixed ring is slidingly installed in the first axial hole, the inner wall of the first fixed ring can abut against the first spherical nozzle, a plurality of first through holes are sequentially arranged on the first circular ring baffle in a circumferential direction, a plurality of first threaded holes are sequentially arranged on the first fixed ring in a circumferential direction, and each first locking screw can pass through one first through hole and be installed in one first threaded hole.

[0009] Preferably, a second circular ring block is fixed inside the head end of the outer wind channel, a plurality of second axial holes are sequentially arranged on the second circular ring block in the circumferential direction, the second rotatable nozzle comprises a second spherical nozzle, a second circular table baffle, a conical nozzle, a second circular ring baffle, a second fixed ring and a plurality of second locking screws, the head end and tail end of the second spherical nozzle are respectively provided with the conical nozzle and the second circular table baffle, the head end of each second axial hole is fixed with one second circular ring baffle, the second spherical nozzle can abut against the inner wall of the second circular ring baffle, the second fixed ring is slidingly installed in the second axial hole, the inner wall of the second fixed ring can abut against the second spherical nozzle, a plurality of second through holes are sequentially arranged on the second circular ring baffle in the circumferential direction, a plurality of second threaded holes are sequentially arranged on the second fixed ring in the circumferential direction, and each second locking screw can pass through one second through hole and be installed in one second threaded hole.

[0010] Preferably, the tail end of the shell is provided with a first circular ring plate, a second circular ring plate is fixedly sleeved on the outer wall of the outer air pipe, and the first circular ring plate and the second circular ring plate are connected through bolts and nuts; the tail end of the outer air pipe is provided with a third circular ring plate, a fourth circular ring plate is fixedly sleeved on the outer wall of the inner air pipe, and the third circular ring plate and the fourth circular ring plate are connected through bolts and nuts; the tail end of the inner air pipe is provided with a fifth circular ring plate, a sixth circular ring plate is fixedly sleeved on the outer wall of the center pipe, and the fifth circular ring plate and the sixth circular ring plate are connected through bolts and nuts.

[0011] Preferably, the first connecting assembly, the second connecting assembly, the third connecting assembly and the fourth connecting assembly are further included, the first connecting assembly is arranged at the head end of the center pipe and used for connecting the center pipe and the first inner pipe, the second connecting assembly is arranged at the head end of the first inner pipe and used for connecting the first inner pipe and the inner air pipe, the third connecting assembly is arranged at the head end of the inner air pipe and used for connecting the inner air pipe and the second inner pipe, and the fourth connecting assembly is arranged at the head end of the second inner pipe and used for connecting the second inner pipe and the outer air pipe.

[0012] Preferably, the first connecting assembly comprises a plurality of first connecting columns, both ends of each first connecting column are respectively connected with the outer wall of the center pipe and the inner wall of the first inner pipe; the second connecting assembly comprises a plurality of second connecting columns, both ends of each second connecting column are respectively connected with the outer wall of the first inner pipe and the inner wall of the inner air pipe; the third connecting assembly comprises a plurality of third connecting columns, both ends of each third connecting column are respectively connected with the outer wall of the inner air pipe and the inner wall of the second inner pipe; and the fourth connecting assembly comprises a plurality of fourth connecting columns, both ends of each fourth connecting column are respectively connected with the outer wall of the second inner pipe and the inner wall of the outer air pipe.

[0013] Preferably, a total air inlet pipe is further included, the inner air inlet pipe and the outer air inlet pipe are both communicated with the total air inlet pipe, the inner air inlet pipe is provided with an inner air valve and an inner air pressure gauge, and the outer air inlet pipe is provided with an outer air valve and an outer air pressure gauge.

[0014] Preferably, the inner air inlet pipe is parallel to the outer air inlet pipe, the inner air inlet pipe is arranged obliquely relative to the central pipe, and the total air inlet pipe is parallel to the central pipe.

[0015] Preferably, the biomass fuel air pipe and the inner air inlet pipe are arranged on two sides of the inner air pipe respectively, and the pulverized coal air pipe and the outer air inlet pipe are arranged on two sides of the outer air pipe respectively.

[0016] Preferably, the shell is formed by pouring refractory material.

[0017] The present application has the following technical effects relative to the prior art:

[0018] The rotary kiln burner of the present application comprises a central pipe, an inner air pipe, an outer air pipe and a shell which are sequentially sleeved and arranged from inside to outside, the inner air pipe is sleeved with a first inner pipe inside, the outer air pipe is sleeved with a second inner pipe inside, and further forms a biomass fuel air channel, an inner air channel, a pulverized coal air channel and an outer air channel which are sequentially arranged from inside to outside. After the biomass fuel is sprayed out from the annular biomass fuel air channel, it is driven by the high-speed rotating and directional inner air, obtains a high speed and momentum, and moves to the central position of the rotary kiln, and burns at a suitable position, thereby solving the problem that when the mixed fuel is used for production in the rotary kiln, the biomass fuel is trapped in the cyclone in the front part of the rotary kiln burner, the burning zone is close to the kiln head, the length is short, and the temperature is low, which leads to unstable kiln condition, reduced combustion efficiency, and reduced clinker yield and quality. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 A perspective structural schematic diagram of the rotary kiln burner provided by the present application is shown.

[0021] Figure 2 A front view of the rotary kiln burner provided by the present application is shown.

[0022] Figure 3 A front view of the head part of the rotary kiln burner provided by the present application is shown.

[0023] Figure 4 The right view of the rotary kiln burner provided by the present application;

[0024] Figure 5 The front view of the first rotatable nozzle in the first state in the rotary kiln burner provided by the present application;

[0025] Figure 6 The front view of the first rotatable nozzle in the second state in the rotary kiln burner provided by the present application;

[0026] Figure 7 The front view of the second rotatable nozzle in the first state in the rotary kiln burner provided by the present application;

[0027] Figure 8 The front view of the second rotatable nozzle in the second state in the rotary kiln burner provided by the present application;

[0028] Figure 9 The right view of the second rotatable nozzle in the rotary kiln burner provided by the present application;

[0029] Figure 10 The structural schematic view of the second fixed ring of the second rotatable nozzle in the rotary kiln burner provided by the present application.

[0030] Explanation of reference numerals: 100, rotary kiln burner; 1, central pipe; 2, inner air pipe; 3, outer air pipe; 4, outer shell; 5, first inner pipe; 6, second inner pipe; 7, ignition oil pipe; 8, oil injection gun; 9, biomass fuel air pipe; 10, pulverized coal air pipe; 11, total air inlet pipe; 12, inner air inlet pipe; 13, inner air valve; 14, inner air pressure gauge; 15, outer air inlet pipe; 16, outer air valve; 17, outer air pressure gauge; 18, biomass fuel air duct; 19, inner air duct; 20, pulverized coal air duct; 21, outer air duct; 22, first circular ring block; 23, first axial hole; 24, first rotatable nozzle; 241, first spherical nozzle; 242, first circular truncated cone baffle; 243, cylindrical nozzle; 244, first circular ring baffle; 245, first fixed ring; 246, first locking screw; 25, second circular ring block; 26, second axial hole; 27, second rotatable nozzle; 271, second spherical nozzle; 272, second circular truncated cone baffle; 273, conical nozzle; 274, second circular ring baffle; 275, second fixed ring; 276, second locking screw; 277, second threaded hole; 28, first connecting column; 29, second connecting column; 30, third connecting column; 31, fourth connecting column; 32, first circular ring plate; 33, second circular ring plate; 34, third circular ring plate; 35, fourth circular ring plate; 36, fifth circular ring plate; 37, sixth circular ring plate; 38, bolt; 39, nut. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a rotary kiln burner that solves the problems of unstable kiln conditions, reduced combustion efficiency, and decreased clinker yield and quality caused by the burning zone being close to the kiln head, short in length, and low in temperature.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-10 As shown, this embodiment provides a rotary kiln burner 100, including a central tube 1, an inner air duct 2, an outer air duct 3, and a shell 4, which are installed sequentially from the inside to the outside. The outer air duct 3 extends to the outside through the tail end of the shell 4, the inner air duct 2 extends to the outside through the tail end of the outer air duct 3, and the central tube 1 extends to the outside through the tail end of the inner air duct 2. A first inner tube 5 is installed inside the inner air duct 2 and is installed outside the central tube 1. A second inner tube 6 is installed inside the outer air duct 3 and is installed outside the inner air duct 2. In this embodiment, the central tube 1, the first inner tube 5, the inner air duct 2, the second inner tube 6, the outer air duct 3, and the shell 4 are arranged coaxially from the inside to the outside and their ends are flush. The central tube 1 is equipped with an ignition oil pipe 7. The tail end of the ignition oil pipe 7 is used to connect to the fuel delivery pipeline to provide sufficient fuel for ignition. The head end of the ignition oil pipe 7 is equipped with an oil spray gun 8, which has a circular oil spray nozzle and is used to spray fuel and ignite the kiln during ignition. A biomass fuel duct 18 is formed between the central pipe 1 and the first inner pipe 5. An inner air duct 19 is formed between the first inner pipe 5 and the inner air duct 2. Multiple first rotatable nozzles 24 are arranged sequentially along the circumference at the head end of the inner air duct 19. A pulverized coal duct 20 is formed between the inner air duct 2 and the second inner pipe 6. An outer air duct 21 is formed between the second inner pipe 6 and the outer air duct 3. Multiple second rotatable nozzles 27 are arranged sequentially along the circumference at the head end of the outer air duct 21. A biomass fuel duct 9 and an inner air inlet duct 12 are arranged on the outer wall of the inner air duct 2. The biomass fuel duct 9 is connected to the biomass fuel duct 18, and the inner air inlet duct 12 is connected to the inner air duct 19. A pulverized coal duct 10 and an outer air inlet duct 15 are arranged on the outer wall of the outer air duct 3. The pulverized coal duct 10 is connected to the pulverized coal duct 20, and the outer air inlet duct 15 is connected to the outer air duct 21.

[0035] The embodiment has biomass fuel air duct 18, inner air duct 19, pulverized coal air duct 20 and outer air duct 21 arranged from inside to outside, and the biomass fuel air duct 18, inner air duct 19, pulverized coal air duct 20 and outer air duct 21 are all circular ring air ducts. The biomass fuel air duct 18 is used for spraying biomass fuel into the kiln for combustion, and the movement of the biomass fuel is mainly affected by the inner air sprayed by the inner air duct 19. The inner air duct 19 is used for spraying medium-speed rotational flow, which can drive the biomass fuel sprayed by the inner biomass fuel air duct 18 and the pulverized coal fuel sprayed by the outer pulverized coal air duct to diffuse to the middle part of the rotary kiln, increase the flame width, control the length of the burning zone, and improve the burning zone temperature. The pulverized coal air duct 20 is used for spraying pulverized coal fuel into the kiln for combustion, and the movement of the pulverized coal fuel is mainly affected by the inner air of the inner air duct 19 and the outer air of the outer air duct 21. The outer air duct 21 is used for spraying high-speed airflow, and the high-speed airflow drives the biomass fuel sprayed by the inner biomass fuel air duct 18 and the pulverized coal fuel sprayed by the pulverized coal air duct 20 to move to the kiln tail of the rotary kiln, so that the two fuels are concentrated for combustion at a position far from the kiln head of the rotary kiln.

[0036] It can be seen that in the embodiment, after the biomass fuel is sprayed out of the annular biomass fuel air duct 18, it is driven by the high-speed rotating and directional inner air, obtains a high speed and momentum, moves to the center position of the rotary kiln, and burns at a suitable position. The problem that the biomass fuel is trapped in the rotational flow in front of the rotary kiln burner 100 when mixed fuel is used for production in the rotary kiln, causing the burning zone to be close to the kiln head, short in length, low in temperature, leading to unstable kiln condition, reduced combustion efficiency, and reduced clinker yield and quality is solved.

[0037] As Figures 4-6As shown, the head end of the inner air duct 19 is internally fixed with a first annular block 22, the inner side and the outer side of the first annular block 22 are fixed on the outer wall of the first inner tube 5 and the inner wall of the inner air tube 2 respectively, a plurality of first axial holes 23 are sequentially arranged on the first annular block 22 in the circumferential direction, the axis direction of the first axial hole 23 is consistent with the axis direction of the central tube 1, and the first rotatable nozzle 24 is arranged in one-to-one correspondence with the first axial hole 23. The first rotatable nozzle 24 comprises a first spherical nozzle 241, a first circular truncated cone baffle 242, a cylindrical nozzle 243, a first annular baffle 244, a first fixed ring 245 and a plurality of first locking screws 246, the head end and the tail end of the first spherical nozzle 241 are respectively provided with the cylindrical nozzle 243 and the first circular truncated cone baffle 242, the first spherical nozzle 241 and the first circular truncated cone baffle 242 are both hollow structures, the cylindrical nozzle 243 is provided with a spiral air fin, the inside of the cylindrical nozzle 243 is provided with an internal thread matched with the structure of the spiral air fin, the head end of each first axial hole 23 is internally fixed with a first annular baffle 244, the first spherical nozzle 241 can abut against the inner wall of the first annular baffle 244, the first fixed ring 245 is slidingly installed in the first axial hole 23, the inner wall of the first fixed ring 245 can abut against the first spherical nozzle 241, and the first annular baffle 244 and the first fixed ring 245 can completely fit when abutting against the first spherical nozzle 241, that is, the inner wall of the first annular baffle 244 and the inner wall of the first fixed ring 245 are consistent with the contact structure when abutting against the outer wall of the first spherical nozzle 241 in this embodiment; a plurality of first through holes are sequentially arranged on the first annular baffle 244 in the circumferential direction, a plurality of first threaded holes are sequentially arranged on the first fixed ring 245 in the circumferential direction, and each first locking screw 246 can pass through a first through hole and be installed in a first threaded hole. The first rotatable nozzle 24 is used for spraying high-speed, rotating and directional airflow, and the rotating direction can be adjusted by 20° by arranging the first circular truncated cone baffle 242.

[0038] When it is necessary to adjust the direction of the first spherical nozzle 241, the first locking screw 246 is screwed outwardly, so that the first fixed ring 245 can move towards the rear end, at this time the first spherical nozzle 241 is no longer pressed by the first fixed ring 245 and the first annular baffle 244, that is, the first spherical nozzle 241 can be rotated, the first spherical nozzle 241 is rotated to the required angle according to the actual requirement, then the first fixed ring 245 is moved towards the front end to abut against the first spherical nozzle 241, and then the first locking screw 246 is screwed inwardly, so that the head of the first locking screw 246 abuts against the outer side of the first annular baffle 244, and the first spherical nozzle 241 is locked and fixed by the pressure of the first fixed ring 245 and the first annular baffle 244.

[0039] In the embodiment, the first through holes, the first threaded holes and the first locking screws 246 are all four in number, and the first locking screws 246 are hexagonal screws. In order to make the first spherical nozzle 241 more firmly fixed, the outer wall of the first spherical nozzle 241, the inner wall of the first circular baffle 244 and the inner wall of the first fixing ring 245 are all provided with frosted surfaces.

[0040] As shown in Figure 4 and Figures 7-10 The head end of the outer air duct 21 is internally fixed with a second circular block 25, the inner side and the outer side of the second circular block 25 are fixed to the outer wall of the second inner tube 6 and the inner wall of the outer air tube 3 respectively, a plurality of second axial holes 26 are sequentially arranged on the second circular block 25 in the circumferential direction, the axial direction of the second axial holes 26 is consistent with the axial direction of the central tube 1, and a second rotatable nozzle 27 is arranged in one-to-one correspondence with the second axial holes 26. The second rotatable nozzle 27 comprises a second spherical nozzle 271, a second circular baffle 272, a conical nozzle 273, a second circular baffle 274, a second fixing ring 275 and a plurality of second locking screws 276, the head end and the tail end of the second spherical nozzle 271 are respectively provided with the conical nozzle 273 and the second circular baffle 272, the second spherical nozzle 271, the conical nozzle 273 and the second circular baffle 272 are all hollow structures, the head end of each second axial hole 26 is internally fixed with a second circular baffle 274, the second spherical nozzle 271 can abut against the inner wall of the second circular baffle 274, the second fixing ring 275 is slidingly installed in the second axial hole 26, the inner wall of the second fixing ring 275 can abut against the second spherical nozzle 271, and the second circular baffle 274 and the second fixing ring 275 can completely fit when abutting against the second spherical nozzle 271, that is, the inner wall of the second circular baffle 274 and the inner wall of the second fixing ring 275 are consistent with the contact structure when abutting against the outer wall of the second spherical nozzle 271 in the embodiment; a plurality of second through holes are sequentially arranged on the second circular baffle 274 in the circumferential direction, a plurality of second threaded holes 277 are sequentially arranged on the second fixing ring 275 in the circumferential direction, and each second locking screw 276 can pass through a second through hole and be installed in a second threaded hole 277. The second rotatable nozzle 27 is used for spraying high-speed airflow in a certain direction, and the second circular baffle 272 is arranged to adjust the rotation direction to ±20°.

[0041] When the direction of the second spherical nozzle 271 needs to be adjusted, the second locking screw 276 is screwed outward, so that the second fixed ring 275 can move to the rear end, at this time the second spherical nozzle 271 is no longer pressed by the second fixed ring 275 and the second circular baffle 274, that is, the second spherical nozzle 271 can rotate, and according to the actual needs, the second spherical nozzle 271 is rotated to the required angle, then the second fixed ring 275 is moved to the front end to abut against the second spherical nozzle 271, and then the second locking screw 276 is screwed inward, so that the head of the second locking screw 276 abuts against the outside of the second circular baffle 274, and the second spherical nozzle 271 is locked and fixed by the pressure of the second fixed ring 275 and the second circular baffle 274.

[0042] In the embodiment, the second through hole, the second threaded hole 277 and the second locking screw 276 are all provided as four, and the second locking screw 276 is a hexagonal screw. In order to make the second spherical nozzle 271 more fixed, the outer wall of the second spherical nozzle 271, the inner wall of the second circular baffle 274 and the inner wall of the second fixed ring 275 are all provided as frosted surfaces.

[0043] In the embodiment, the inner air duct 19 and the outer air duct 21 both adopt rotatable nozzles to spray high-speed airflow. In particular, the first spherical nozzle 241 of the inner air duct 19 can be connected with the cylindrical nozzle 243 embedded with a spiral air fin, and the flow direction and rotation mode of the airflow are controlled, thereby increasing the controllability and flexibility of the shape of the flame in the kiln. At the same time, in the embodiment, the control methods for two different fuels in the kiln can be distinguished, the biomass fuel is mainly controlled by the inner air, and the pulverized coal fuel is controlled by the inner air and the outer air, thereby making the shape and temperature of the flame in the kiln easy to control.

[0044] As shown in Figure 2 , the tail end of the outer shell 4 is provided with a first circular plate 32, the outer wall of the outer air pipe 3 is fixedly provided with a second circular plate 33, the first circular plate 32 and the second circular plate 33 are connected by bolts 38 and nuts 39; the tail end of the outer air pipe 3 is provided with a third circular plate 34, the outer wall of the inner air pipe 2 is fixedly provided with a fourth circular plate 35, the third circular plate 34 and the fourth circular plate 35 are connected by bolts 38 and nuts 39; the tail end of the inner air pipe 2 is provided with a fifth circular plate 36, the outer wall of the center pipe 1 is fixedly provided with a sixth circular plate 37, the fifth circular plate 36 and the sixth circular plate 37 are connected by bolts 38 and nuts 39.

[0045] As shown in Figure 3As shown, this embodiment also includes a first connecting component, a second connecting component, a third connecting component, and a fourth connecting component. The first connecting component is disposed at the head end of the central pipe 1 and is used to connect the central pipe 1 and the first inner pipe 5. The second connecting component is disposed at the head end of the first inner pipe 5 and is used to connect the first inner pipe 5 and the inner air duct 2. The third connecting component is disposed at the head end of the inner air duct 2 and is used to connect the inner air duct 2 and the second inner pipe 6. The fourth connecting component is disposed at the head end of the second inner pipe 6 and is used to connect the second inner pipe 6 and the outer air duct 3.

[0046] Specifically, the first connecting assembly includes a plurality of first connecting posts 28, with both ends of each first connecting post 28 connected to the outer wall of the central tube 1 and the inner wall of the first inner tube 5, respectively; the second connecting assembly includes a plurality of second connecting posts 29, with both ends of each second connecting post 29 connected to the outer wall of the first inner tube 5 and the inner wall of the inner air duct 2, respectively; the third connecting assembly includes a plurality of third connecting posts 30, with both ends of each third connecting post 30 connected to the outer wall of the inner air duct 2 and the inner wall of the second inner tube 6, respectively; and the fourth connecting assembly includes a plurality of fourth connecting posts 31, with both ends of each fourth connecting post 31 connected to the outer wall of the second inner tube 6 and the inner wall of the outer air duct 3, respectively.

[0047] In this specific embodiment, the first connecting component includes three first connecting posts 28 evenly distributed along the circumference, the second connecting component includes three second connecting posts 29 evenly distributed along the circumference, the third connecting component includes three third connecting posts 30 evenly distributed along the circumference, and the fourth connecting component includes three fourth connecting posts 31 evenly distributed along the circumference.

[0048] like Figure 2 As shown, this embodiment also includes a main air inlet duct 11, an inner air inlet duct 12, and an outer air inlet duct 15, all connected to the main air inlet duct 11. The inner air inlet duct 12 is equipped with an inner air valve 13 and an inner air pressure gauge 14, which is positioned between the inner air valve 13 and the inner air duct 15. The outer air inlet duct 15 is equipped with an outer air valve 16 and an outer air pressure gauge 17, which is positioned between the outer air valve 16 and the outer air duct 15. The inner air pressure gauge 14 and the outer air pressure gauge 17 are used to monitor the pressure of the inner air inlet duct 12 and the outer air inlet duct 15 in real time. The inner air valve 13 and the outer air valve 16 are used to control the pressure and airflow of the inner air inlet duct 12 and the outer air inlet duct 15 in real time.

[0049] Specifically, the internal air inlet duct 12 is parallel to the external air inlet duct 15, and the internal air inlet duct 12 is inclined relative to the central duct 1. The main air inlet duct 11 is parallel to the central duct 1. In this specific embodiment, the angle between the axis of the internal air inlet duct 12 and the axis of the central duct 1 is 60°.

[0050] In the embodiment, the biomass fuel air duct 9 and the inner air inlet duct 12 are arranged on the upper and lower sides of the inner air duct 2 respectively, and the pulverized coal air duct 10 and the outer air inlet duct 15 are arranged on the upper and lower sides of the outer air duct 3 respectively.

[0051] In the embodiment, the shell 4 is formed by pouring refractory material. The shell 4 formed by pouring refractory material is wrapped outside the outer air duct 3, which is used to protect the burner from being damaged by high-temperature flame.

[0052] In the embodiment, the biomass fuel is injected into the kiln by the biomass fuel air duct 18. The biomass fuel air duct 18 is in the shape of a ring, which is more conducive to controlling the injection speed of the biomass fuel and makes the injection distribution of the biomass fuel more uniform, so as to ensure that the flame shape and the temperature in the kiln are more stable when the burning is stable, and the production efficiency and the quality of the clinker are higher. The radial dimension of the biomass fuel passage is greater than the radial dimension of the central ignition oil pipe 7, and the inner air duct 19 close to the outer side is moved to the center of the kiln at high speed and in a certain direction by the speed and momentum provided by the inner air, and is concentrated in the burning zone for burning to provide the heat required for clinker burning. The pulverized coal fuel is injected into the kiln by the pulverized coal air duct 20. The pulverized coal air duct 20 is in the shape of a ring and is located between the inner air duct 19 and the outer air duct 21, and is moved to the burning zone in the kiln for concentrated burning by the speed and momentum provided by the inner air and the outer air.

[0053] Further, the inner air can change the speed, blowing angle and spiral mode of the inner air by adjusting the inner air valve 13, the direction of the first spherical nozzle 241 and the type of the spiral air fin, so as to more flexibly control the moving direction of the biomass fuel and the pulverized coal fuel, the temperature distribution in the kiln and the thickness of the flame in the kiln. The outer air can change the speed and blowing angle of the outer air by adjusting the outer air valve 16 and the direction of the second spherical nozzle 271, so as to more flexibly control the moving direction of the pulverized coal combustion, the temperature distribution in the kiln and the length of the flame in the kiln. Ultimately, the purpose of using mixed fuel mainly composed of biomass fuel and pulverized coal fuel to produce cement clinker in the rotary kiln for a long time, stably, efficiently and with high quality is achieved.

[0054] The principles and implementation manners of the present application are described by using specific examples in the specification. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A rotary kiln burner characterized by, The application relates to a biomass fuel and pulverized coal mixed combustion device, which comprises a center pipe, an inner air pipe, an outer air pipe and an outer shell which are sequentially sleeved from inside to outside, the outer air pipe extends to the outside through the tail end of the outer shell, the inner air pipe extends to the outside through the tail end of the outer air pipe, the center pipe extends to the outside through the tail end of the inner air pipe, the inner air pipe is sleeved with a first inner pipe on the inside, and the first inner pipe is sleeved on the outside of the center pipe, the outer air pipe is sleeved with a second inner pipe on the inside, and the second inner pipe is sleeved on the outside of the inner air pipe, a priming oil pipe is arranged in the center pipe, the tail end of the priming oil pipe is used for being connected with a fuel oil conveying pipeline, and the head end of the priming oil pipe is provided with an oil gun, a biomass fuel air channel is formed between the center pipe and the first inner pipe, an inner air air channel is formed between the first inner pipe and the inner air pipe, a plurality of first rotatable nozzles are sequentially arranged on the head end of the inner air air channel in the circumferential direction, a pulverized coal air channel is formed between the inner air pipe and the second inner pipe, an outer air air channel is formed between the second inner pipe and the outer air pipe, a plurality of second rotatable nozzles are sequentially arranged on the head end of the outer air air channel in the circumferential direction, a biomass fuel air pipe and an inner air inlet pipe are arranged on the outer wall of the inner air pipe, the biomass fuel air pipe is connected with the biomass fuel air channel, the inner air inlet pipe is connected with the inner air air channel, a pulverized coal air pipe and an outer air inlet pipe are arranged on the outer wall of the outer air pipe, the pulverized coal air pipe is connected with the pulverized coal air channel, and the outer air inlet pipe is connected with the outer air air channel, a first annular block is fixedly arranged in the head end of the inner air air channel, a plurality of first axial holes are sequentially arranged on the first annular block in the circumferential direction, the first rotatable nozzle comprises a first spherical nozzle, a first circular truncated cone baffle, a cylindrical nozzle, a first annular baffle, a first fixing ring and a plurality of first locking screws, the head end and the tail end of the first spherical nozzle are respectively provided with the cylindrical nozzle and the first circular truncated cone baffle, a spiral air fin is arranged in the cylindrical nozzle, the head end of each first axial hole is fixedly provided with one first annular baffle, the first spherical nozzle can abut against the inner wall of the first annular baffle, the first fixing ring is slidably arranged in the first axial hole, the inner wall of the first fixing ring can abut against the first spherical nozzle, a plurality of first through holes are sequentially arranged on the first annular baffle in the circumferential direction, a plurality of first screw holes are sequentially arranged on the first fixing ring in the circumferential direction, and each first locking screw can pass through one first through hole and is arranged in one first screw hole.

2. A rotary kiln burner according to claim 1, characterised in that, The head end of the outer air duct is internally fixed with a second circular ring block, a plurality of second axial holes are sequentially arranged on the second circular ring block in the circumferential direction, the second rotatable nozzle comprises a second spherical nozzle, a second circular table baffle, a conical nozzle, a second circular ring baffle, a second fixed ring and a plurality of second locking screws, the head end and the tail end of the second spherical nozzle are respectively provided with the conical nozzle and the second circular table baffle, the head end of each second axial hole is internally fixed with one second circular ring baffle, the second spherical nozzle can abut against the inner wall of the second circular ring baffle, the second fixed ring is slidingly installed in the second axial hole, the inner wall of the second fixed ring can abut against the second spherical nozzle, a plurality of second through holes are sequentially arranged on the second circular ring baffle in the circumferential direction, a plurality of second threaded holes are sequentially arranged on the second fixed ring in the circumferential direction, and each second locking screw can pass through one second through hole and be installed in one second threaded hole.

3. The rotary kiln burner of claim 1, wherein, The tail end of the shell is provided with a first circular ring plate, the outer wall of the outer air pipe is fixedly sleeved with a second circular ring plate, and the first circular ring plate and the second circular ring plate are connected through bolts and nuts; the tail end of the outer air pipe is provided with a third circular ring plate, the outer wall of the inner air pipe is fixedly sleeved with a fourth circular ring plate, and the third circular ring plate and the fourth circular ring plate are connected through bolts and nuts; the tail end of the inner air pipe is provided with a fifth circular ring plate, the outer wall of the center pipe is fixedly sleeved with a sixth circular ring plate, and the fifth circular ring plate and the sixth circular ring plate are connected through bolts and nuts.

4. The rotary kiln burner of claim 1, wherein, Further comprising a first connecting assembly, a second connecting assembly, a third connecting assembly and a fourth connecting assembly, the first connecting assembly is arranged at the head end of the center pipe and is used for connecting the center pipe and the first inner pipe, the second connecting assembly is arranged at the head end of the first inner pipe and is used for connecting the first inner pipe and the inner air pipe, the third connecting assembly is arranged at the head end of the inner air pipe and is used for connecting the inner air pipe and the second inner pipe, and the fourth connecting assembly is arranged at the head end of the second inner pipe and is used for connecting the second inner pipe and the outer air pipe.

5. A rotary kiln burner according to claim 4, characterised in that, The first connecting assembly comprises a plurality of first connecting columns, both ends of each first connecting column are connected with the outer wall of the center pipe and the inner wall of the first inner pipe respectively, the second connecting assembly comprises a plurality of second connecting columns, both ends of each second connecting column are connected with the outer wall of the first inner pipe and the inner wall of the inner air pipe respectively, the third connecting assembly comprises a plurality of third connecting columns, both ends of each third connecting column are connected with the outer wall of the inner air pipe and the inner wall of the second inner pipe respectively, and the fourth connecting assembly comprises a plurality of fourth connecting columns, both ends of each fourth connecting column are connected with the outer wall of the second inner pipe and the inner wall of the outer air pipe respectively.

6. The rotary kiln burner of claim 1, wherein, Further comprising a total air inlet pipe, the inner air inlet pipe and the outer air inlet pipe are communicated with the total air inlet pipe, the inner air inlet pipe is provided with an inner air valve and an inner air pressure gauge, and the outer air inlet pipe is provided with an outer air valve and an outer air pressure gauge.

7. The rotary kiln burner of claim 6, wherein, The inner air inlet pipe is parallel to the outer air inlet pipe, and is arranged obliquely relative to the central pipe.

8. The rotary kiln burner of claim 1, wherein, The biomass fuel air pipe and the inner air inlet pipe are arranged on two sides of the inner air pipe respectively, and the pulverized coal air pipe and the outer air inlet pipe are arranged on two sides of the outer air pipe respectively.

9. The rotary kiln burner of claim 1, wherein, The shell is formed by pouring refractory material.

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