Rice chaff burner for coal gangue ceramsite

Abstract

The present invention relates to a rice bran burner for coal gangue ceramsite, comprising an outer burner tube and an inner sleeve disposed within the burner tube. The inner sleeve is provided with a plurality of spiral blades, each of which is spaced apart around the centerline of the inner sleeve, with the axis of each blade parallel to the centerline of the inner sleeve. The inner sleeve is also provided with a sealing plate for blocking the intervals between the blades. During operation, an airflow carrying rice bran is rectified by the rotor blades, generating a spirally dispersed rice bran spray, which changes the trajectory and shape of the rice bran spray. Compared to existing technologies, the rice bran burns more fully, the flame in the kiln is clear, the calcination effect is good, the raw material is reduced, and the rice bran ash produced by incomplete rice bran combustion is avoided from causing adhesion.

Description

Technical Field

[0001] The invention belongs to the field of ceramsite production equipment, and in particular relates to a chaff burner used for gangue ceramsite. Background Art

[0002] Currently, many projects are converting coal gangue into ceramsite. For cost reasons, biomass fuel is often used as a heat source. Rice bran powder, with a calorific value of around 3000 kcal, is commonly used as a biomass fuel. This is fed into the kiln via a centrifugal fan through a conveying pipe. Because the firing temperature range of ceramsite is relatively narrow, generally controlled within 50°C, if the rice bran powder doesn't burn fully or isn't sprayed into the designated combustion zone, it can significantly impact the firing process. This can have the following hazards: 1) Incomplete combustion prevents the kiln temperature from rising to the required firing temperature, resulting in excessive raw material. 2) Unburned rice bran ash can adhere to the kiln walls, forming a ring and impacting production. 3) If the rice bran powder is fed too far from the kiln mouth, the firing zone becomes too long, hindering the kiln operator's ability to clearly observe the firing progress. If it is fed too close, the pellets spend less time in the firing zone, resulting in poor firing and excessive raw material. The existing bran burner does not spray bran with sufficient atomization, the bran cannot be fully burned, and the combustion efficiency is low; at the same time, the injection distance is far, the calcination zone is far from the kiln mouth, and it is difficult for the kiln head fire watcher to control the flame. Summary of the Invention

[0003] The invention aims to provide a rice bran burner for coal gangue ceramsite, so as to solve the problems of insufficient atomization of rice bran sprayed by existing rice bran burners, inability to fully burn rice bran and low combustion efficiency.

[0004] To achieve the above-mentioned purpose, the rice bran burner for coal gangue expanded clay of the present invention adopts the following technical solution: the rice bran burner for coal gangue expanded clay includes a burner outer tube, and also includes an inner sleeve arranged inside the burner outer tube, and a plurality of spiral blades are provided in the inner sleeve, and each spiral blade is arranged at intervals around the center line of the inner sleeve, and the axis of each spiral blade is parallel to the center line of the inner sleeve, and the inner sleeve is also provided with a sealing plate for sealing the intervals between the spiral blades.

[0005] Beneficial Effects: During operation, the chaff-laden airflow is split by the burner's rotating blades into multiple streams, each forming a spirally dispersed chaff spray. This changes the trajectory and shape of the chaff spray. This splits the original chaff spray into multiple streams, which are then fully mixed with the air during the splitting process, allowing the raw material to mix with the flame, resulting in a more complete calcination process. Compared to existing technologies, the chaff burns more completely, resulting in higher kiln temperatures, clearer flames, better calcination results, less raw material, and avoids the buildup of chaff ash caused by incomplete combustion.

[0006] Furthermore, the spiral blade is a positive spiral structure in which the axis of the spiral surface passes through the midpoint of the generatrix of the spiral surface.

[0007] Furthermore, the rotation direction of the rotary blade is opposite to that of the gangue ceramsite rotary kiln during operation; during the movement, the chaff will meet the raw material, and the flame will be more likely to contact the material.

[0008] Furthermore, the pitch of the rotor blades cannot be too large, which will cause the chaff to be too dispersed. The conventional rotor blade pitch is 550-750mm.

[0009] Furthermore, the burner outer tube outlet faces left, and a reserved space is left between the left end surface of the inner sleeve and the burner outer tube outlet for correcting the dispersed material conveying path.

[0010] Furthermore, the reserved interval is 80-120 mm.

[0011] Furthermore, the outer edge of each rotary blade abuts against and is welded to the inner wall of the inner sleeve.

[0012] Furthermore, there are two sealing plates, each of which is a circular structure. The two sealing plates are respectively arranged at the two end portions of the rotary blades and seal the intervals between the rotary blades.

[0013] Furthermore, a set screw is provided on the side wall of the burner outer cylinder and is arranged radially along the burner outer cylinder, and the end of the set screw is against the outer peripheral surface of the inner sleeve.

[0014] Furthermore, the rice bran burner for coal gangue ceramsite also includes a windproof sleeve arranged at the outlet of the burner outer tube. The windproof sleeve is a frustum-shaped structure, and the small end of the windproof sleeve is docked at the outlet of the burner outer tube. This can effectively avoid the influence of other airflows at the kiln head.

[0015] Furthermore, the outer surface of the windshield is provided with a preheating hole for hot air from the kiln head to enter and preheat the biomass fuel. During operation, hot air from the kiln head enters through the preheating hole, preheating the chaff. This allows the injected chaff to burn immediately, greatly improving combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0017] Figure 1 It is a structural schematic diagram of a specific embodiment of the rice chaff burner for coal gangue ceramsite of the present invention.

[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0019] Figure 3 yes Figure 2 Right view;

[0020] Figure 4 This is a schematic diagram of the assembly of the inner sleeve, rotor blades and sealing plate;

[0021] Figure 5 This is the assembly diagram of the rotary blade and the sealing plate Figure 1 ;

[0022] Figure 6 This is the assembly diagram of the rotary blade and the sealing plate Figure 2 ;

[0023] Figure 7 It is a structural diagram of the rotor blade.

[0024] In the figure: 100-burner outer tube, 200-inner sleeve, 300-set screw, 400-rotating blade, 401-helical surface axis, 402-helical surface busbar, 500-sealing plate, 600-windproof sleeve, 601-preheating hole, 700-burner bracket, 800-adjustment device, 900-plastic hose. DETAILED DESCRIPTION

[0025] In order to make the technical purpose, technical solution and beneficial effects of the present invention more clear, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Specific embodiments of the rice chaff burner for coal gangue ceramsite, such as Figures 1 to 7 As shown, it includes a burner outer cylinder 100, an inner sleeve 200, a burner bracket 700, an adjustment device 800, and a plastic hose 900. The burner outer cylinder 100 is arranged horizontally, with the outlet of the burner outer cylinder 100 facing left. The inner sleeve 200 is arranged concentrically with the burner outer cylinder 100. The side wall of the burner outer cylinder 100 is provided with a tightening screw 300 arranged along the radial direction of the burner outer cylinder. There are more than two tightening screws 300, and the end of each tightening screw 300 is against the outer circumferential surface of the inner sleeve 200 to position the inner sleeve 200.

[0027] Five rotor blades 400 are provided in the inner sleeve 200. The rotor blade 400 is a positive spiral structure in which the spiral axis 401 passes through the midpoint of the spiral generatrix 402, and the rotation direction of the rotor blade 400 is opposite to the direction of rotation of the coal gangue ceramsite rotary kiln during operation. The rotor blades 400 are arranged at intervals around the center line of the inner sleeve 200, and the axis of the rotor blade 400 is parallel to the center line of the inner sleeve 200. The outer edge of each rotor blade 400 is abutted against and welded to the inner wall of the inner sleeve 200. During welding, only the head and tail parts of the rotor blade 400 are welded, and double-sided welding is performed to avoid deformation.

[0028] The rotor blades in this embodiment are made of 6 mm thick steel plates. The pitch of the rotor blades 400 cannot be too large, otherwise the chaff will be too dispersed. The conventional rotor blade pitch is 550-750 mm, and the pitch in this embodiment is 600 mm.

[0029] A 60-70mm gap is reserved between the rotor blades 400 in the inner cylinder 200. Two circular sealing plates 500 are provided within the inner sleeve 200 to seal the gaps between the rotor blades 400. These plates 500 are located at each end of the rotor blades. These plates 500 not only connect and secure the rotor blades 400, but also block the gaps between the blades 400, forcing airflow containing chaff to pass through the rotor blades 400. The inner sleeve 200, rotor blades 400, and / or sealing plates 500 are made of 0Cr18Ni9.

[0030] The right end of the inner sleeve 200 is aligned with the right end of the burner outer barrel 100. A gap a is left between the left end of the inner sleeve 200 and the left end of the burner outer barrel 100 (i.e., the burner outer barrel outlet) to correct the dispersed material conveying paths (each rotor represents a path). The dimension of the reserved gap a along the centerline of the inner sleeve is 80-120 mm, preferably 100 mm. This corrects and mixes the various bran powder paths, resulting in a more uniform atomization of the sprayed bran powder.

[0031] Taking into account that the burner is easily affected by other airflows near the kiln mouth, the flame will rise and cannot burn the ceramsite at the bottom, resulting in the need for more fuel and poor calcination effect. The present invention provides a windproof sleeve 600 at the outlet of the burner outer tube 100. The windproof sleeve 600 is a frustum-shaped structure, and the small end of the windproof sleeve 600 is docked at the outlet of the burner outer tube 100, which can effectively avoid the influence of other airflows at the kiln head.

[0032] The outer peripheral surface of the windproof sleeve 600 is provided with a preheating hole 601 for hot air at the kiln head of the rotary kiln (due to the burning of rice husks, there is negative pressure at the kiln head) to enter to preheat the biomass fuel. The preheating hole 601 is a rectangular hole. There are two preheating holes 601, and the two preheating holes 601 are symmetrically arranged front to back. During operation, the heat from the kiln head of the rotary kiln will enter through the preheating hole 601 to preheat the rice husks in advance.

[0033] During operation, the chaff-laden airflow passes through rotor blades 400 and is split into six streams, each forming a spirally dispersed chaff spray. This alters the chaff spray trajectory and shape, transforming the original chaff spray into multiple streams. During the splitting process, the chaff is thoroughly mixed with the air. Simultaneously, the rotation of each chaff spray is opposite to the direction of the rotary kiln. During this movement, the chaff encounters the raw meal, allowing the flame to more easily contact the material. This ensures a thorough mixing of the raw meal and flame, resulting in a more complete calcination process. Hot air from the kiln head also enters the windshield 600 through preheating holes 601, preheating the chaff spray. Compared to existing technologies, the chaff burns more completely, resulting in higher kiln temperatures, clearer flames, better calcination results, less raw meal, and avoids chaff ash caused by incomplete chaff combustion.

[0034] In other embodiments, the pitch, length, and number of the rotor blades can be adjusted according to actual needs; in addition, the rotor blades can also adopt spiral structures of other structural forms, such as an oblique spiral surface structure, an expandable spiral surface structure, etc.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate and not to limit the technical solutions of the present invention. Any equivalent substitutions of the present invention and any modifications or partial substitutions that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A rice bran burner for coal gangue ceramsite, comprising a burner outer cylinder, characterized in that: The utility model also includes an inner sleeve arranged inside the outer tube of the burner, wherein a plurality of regular spiral blades are arranged in the inner sleeve, and the rotary blades are arranged at intervals around the center line of the inner sleeve, and the axis of each rotary blade is parallel to the center line of the inner sleeve. The inner sleeve is also provided with a sealing plate for sealing the intervals between the rotary blades. There are two sealing plates, which are circular structures. The two sealing plates are respectively arranged at the two end portions of the rotary blades and seal the intervals between the rotary blades. The rotary blades are regular spiral structures with the axis of the spiral surface passing through the midpoint of the generatrix of the spiral surface. The rotation direction of the rotary blades is opposite to the rotation direction of the coal gangue ceramsite rotary kiln during operation.

2. The rice chaff burner for coal gangue ceramsite according to claim 1, characterized in that: The pitch of the rotor blades is 550-750mm.

3. The rice chaff burner for coal gangue ceramsite according to claim 1, characterized in that: The burner outer tube outlet faces left, and a reserved space for correcting the dispersed material conveying path is left between the left end surface of the inner sleeve and the burner outer tube outlet.

4. The rice chaff burner for coal gangue ceramsite according to claim 1, characterized in that: The outer edge of each rotary blade abuts against and is welded to the inner wall of the inner sleeve.

5. The rice chaff burner for coal gangue ceramsite according to claim 1, characterized in that: A set screw is provided on the side wall of the burner outer cylinder and is arranged radially along the burner outer cylinder. The end of the set screw is against the outer peripheral surface of the inner sleeve.

6. The rice chaff burner for coal gangue ceramsite according to any one of claims 1 to 5, characterized in that: The rice chaff burner for coal gangue ceramsite also includes a windproof sleeve arranged at the outlet of the burner outer tube. The windproof sleeve is a frustum-shaped structure, and the small end of the windproof sleeve is docked at the outlet of the burner outer tube.

7. The rice chaff burner for coal gangue ceramsite according to claim 6, characterized in that: The outer peripheral surface of the windproof sleeve is provided with a preheating hole for hot air at the kiln head of the rotary kiln to enter so as to preheat the biomass fuel.

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