Aluminum oxide microsphere calcining fluidized bed furnace

Abstract

The utility model discloses an alumina microsphere calcining fluidized bed furnace which comprises a furnace body with a cavity, the furnace body is provided with a raw material inlet, a gas burner and a raw material outlet which are communicated with the cavity, and the cavity of the furnace body is divided into a lower combustion chamber and an upper calcining chamber by a plurality of horizontal combustion chamber distribution plates which are arranged at intervals. A gas nozzle is arranged in a gap between the combustion chamber distribution plates, the gas nozzle is communicated with the combustion chamber, and the raw material inlet is communicated with the calcining chamber; a plurality of calcining chamber distribution plates are arranged in the calcining chamber, the calcining chamber distribution plates are fixed on the inner wall of the furnace body and are uniformly distributed at intervals along the height direction of the furnace body, each calcining chamber distribution plate is of a bent plate structure formed by connecting two inclined plates, and the opening of each calcining chamber distribution plate faces the bottom of the furnace body. According to the utility model, the alumina powder is stopped on the distribution plate of the calcining chamber for a period of time, so that the retention time of the alumina powder in the calcining chamber is prolonged, and the alumina powder can be fully sintered to obtain high-quality alumina balls.

Description

Technical Field

[0001] The utility model relates to the technical field of alumina production equipment, in particular to an alumina micro-ball calcining boiling furnace. Background Art

[0002] In the production process of alumina microspheres, the alumina powder needs to be washed and impurities removed first, and then the baked alumina powder is sent to the boiling furnace for calcination, and finally sintered into alumina microspheres. Whether the alumina powder can be fully calcined in the boiling furnace is an important condition to ensure the quality of alumina microspheres. The conditions that affect the calcination effect include the dispersion of the alumina powder in the boiling furnace and the calcination residence time in the boiling furnace.

[0003] The Chinese utility model patent document with the announcement number CN216845660U discloses a novel multi-fuel high-temperature flue gas boiling furnace, whose technical solution includes a bracket, a furnace body is installed above the bracket, an explosion-proof hole is arranged on the top of the furnace body, an air outlet is opened on the right side of the furnace body, and an air inlet chamber is connected to the bottom of the furnace body, and a first air inlet is opened on the left side of the air inlet chamber. The technical solution of the utility model can generate an air pressure difference between the upper and lower sides of the air distribution plate by setting the air holes of the air distribution plate to a structure in which the upper opening is smaller than the lower opening, thereby promoting air to enter the combustion chamber, and by setting an arc-shaped top cover above the air holes, the air flows out from the gap between the top cover and the air holes, which can prevent the smoke generated during the roasting process from entering the air holes, prevent the smoke from blocking the air holes and causing insufficient combustion in the furnace, extend the service life of the air distribution plate, and improve the working efficiency of the boiling furnace.

[0004] The technical solution disclosed in the above patent can only avoid the problem of insufficient combustion by ensuring smooth air circulation, and can only achieve normal combustion of the boiling furnace, but does not further improve the calcination effect. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an alumina microsphere calcining boiling furnace which can effectively improve the calcining effect of alumina powder.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: an alumina microsphere calcining boiling furnace, comprising a furnace body with a cavity, on which a raw material inlet, a gas burner and a raw material outlet connected to the cavity are arranged, the cavity of the furnace body is divided into a lower combustion chamber and an upper calcining chamber by a plurality of horizontal and spaced combustion chamber distribution plates, a gas nozzle is arranged in the gap between the combustion chamber distribution plates, the gas burner is connected to the combustion chamber, and the raw material inlet is connected to the calcining chamber; a plurality of calcining chamber distribution plates are arranged in the calcining chamber, the calcining chamber is fixed on the inner wall of the furnace body and spaced evenly along the height direction of the furnace body, the calcining chamber distribution plates are a bent plate structure composed of two inclined plates connected, and the opening of the calcining chamber distribution plates faces the bottom of the furnace body.

[0007] As an improvement of the above solution: the edge of the calcining chamber distribution plate is bent toward the top of the furnace body, and the bending portion is in an arc-shaped transition.

[0008] As an improvement of the above solution: the size of the calcining chamber distribution plate decreases from bottom to top, and the bending angle of the calcining chamber distribution plate increases from bottom to top.

[0009] As an improvement of the above solution: the inner wall of the furnace body is covered with an insulation layer and a refractory layer in sequence from the outside to the inside; the insulation layer is formed by insulation bricks, and the refractory layer is formed by refractory bricks; the furnace body is made of steel.

[0010] As an improvement of the above solution: the air nozzles are evenly spaced in a circular pattern in the horizontal direction, and the upper aperture of the air nozzle is smaller than the lower aperture of the air nozzle.

[0011] As an improvement of the above solution: the lower part of the furnace body is a cylindrical structure, the upper part of the furnace body is a conical structure, and the top of the furnace body is connected to the raw material outlet through a horizontally extending channel.

[0012] The beneficial effects of the utility model are as follows: the utility model divides the furnace body into a combustion chamber and a calcining chamber by arranging a combustion chamber distribution plate in the furnace body of the fluidized bed furnace, so that the gas entering the furnace body through the gas burner is first gathered in the lower combustion chamber for full combustion, and then the hot air generated by the combustion enters the upper calcining chamber through the gas nozzle, and the hot air can be distributed through the gas nozzle so that the hot air is dispersed into the upper calcining chamber, so as to ensure that the temperature areas of various areas in the calcining chamber tend to be balanced, so that the alumina powder sent into the calcining chamber is heated evenly, and thus the calcining effect of the alumina powder can be improved; the utility model blocks the alumina powder rising with the hot air flow by arranging a plurality of calcining chamber distribution plates in the calcining chamber, so that the alumina powder is intercepted on the calcining chamber distribution plates for a period of time to increase the residence time of the alumina powder in the calcining chamber, and at the same time, the alumina powder can be broken up by the calcining chamber distribution plates to disperse the alumina powder in the calcining chamber, so that the alumina powder in the calcining chamber can be fully calcined, ensuring that the alumina powder can be fully sintered to obtain high-quality alumina balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural sectional view of the utility model.

[0014] Markings in the figure are: 100-furnace body, 110-combustion chamber, 120-calcination chamber, 200-raw material inlet, 300-gas burner, 400-raw material outlet, 500-combustion chamber distribution plate, 510-gas nozzle, 600-calcination chamber distribution plate, 700-insulation layer, 800-refractory layer. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0016] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", and "inside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0017] like Figure 1 As shown, the main body of the alumina microsphere calcining boiling furnace disclosed in the utility model is a furnace body 100, a cavity is provided inside the furnace body 100, and a raw material inlet 200, a gas burner 300 and a raw material outlet 400 are connected to the furnace body 100; the raw material inlet 200 is connected to the cavity of the furnace body 100 so that the alumina powder to be calcined is fed into the cavity of the furnace body 100 through the raw material inlet 200; the gas burner 300 is connected to the cavity of the furnace body 100 so that the gas is fed into the cavity of the furnace body 100 through the gas burner 300 for combustion, thereby generating rising hot air, and the hot air contacts the alumina powder fed into the cavity during the rising process, and while the alumina powder is calcined, the alumina powder is driven to rise together by the rising hot air flow; the raw material outlet 400 is connected to the cavity of the furnace body 100 so that the alumina microspheres obtained after the alumina powder is calcined are discharged through the raw material outlet 400.

[0018] In order to improve the calcination effect of alumina powder, the utility model arranges a plurality of combustion chamber distribution plates 500 in the cavity of the furnace body 100. The plurality of combustion chamber distribution plates 500 are horizontally arranged in the cavity of the furnace body 100 and are spaced apart from each other. Gas nozzles 510 are arranged at the gaps between adjacent combustion chamber distribution plates 500 for filling. The cavity of the furnace body 100 is divided into two upper and lower half-cavities by the combustion chamber distribution plates 500. The half-cavity below the combustion chamber distribution plates 500 is the combustion chamber 110, and the half-cavity above the combustion chamber distribution plates 500 is the calcination chamber 120. The gas burner 300 is connected to the combustion chamber 110, and the raw material inlet 200 is connected to the calcination chamber 120. The utility model divides the cavity of the furnace body 100 by arranging a combustion chamber distribution plate 500, so that the gas burner 300 connected to the combustion chamber 110 directly passes the gas into the combustion chamber 110 for combustion. Due to the partition effect of the combustion chamber distribution plate 500, the gas will not enter the calcining chamber 120 at the first time but will be collected in the combustion chamber 110 for full combustion. Then the hot air generated by the combustion rises and enters the calcining chamber 120 through the gas nozzle 510. The hot air is diverted by the gas nozzle 510, so that the hot air entering the calcining chamber 120 flows in a dispersed manner, thereby ensuring that the temperature of each area in the combustion chamber 110 and the calcining chamber 120 tends to be uniform, and the problem of affecting the calcination quality due to heat concentration will not occur.

[0019] Furthermore, in order to improve the dispersion effect of hot air, the utility model optimizes the arrangement of the air nozzle 510, so that the air nozzle 510 is evenly spaced in a circular shape in the horizontal direction, so that the hot air entering the calcining chamber 120 through the air nozzle 510 can be completely diffused to different areas in the calcining chamber 120; at the same time, the utility model stipulates that the upper aperture of the air nozzle 510 is smaller than the lower aperture of the air nozzle 510, so that the air nozzle 510 presents a structure with a small top and a large bottom. On the one hand, it can improve the collection effect of the air nozzle 510 on the hot air in the combustion chamber 110, and on the other hand, it can use the aperture difference between the upper and lower apertures of the air nozzle 510 to generate an air pressure difference to promote the flow effect of hot air, thereby improving the efficiency of hot air flowing from the combustion chamber 110 to the calcining chamber 120.

[0020] like Figure 1As shown, the utility model further arranges a plurality of calcining chamber distribution plates 600 in the calcining chamber 120 at the upper part of the furnace body 100. The calcining chamber distribution plates 600 are a bent plate structure composed of two inclined plates connected at a certain angle, and the opening of the combustion chamber distribution plates 600 faces downward, that is, the opening direction faces the bottom of the furnace body 100. The plurality of calcining chamber distribution plates 600 used in the utility model are evenly spaced and arranged along the height direction of the furnace body 100, and the calcining chamber distribution plates 600 are fixedly connected to the inside of the furnace body 100. By setting the calcining chamber distribution plate 600 in the calcining chamber 120, the alumina powder entering the calcining chamber 120 is blocked by the calcining chamber distribution plate 600 in the process of rising with the hot air flow, and then is intercepted by the calcining chamber distribution plate 600 for a period of time, so that the residence time of the alumina powder in the calcining chamber 120 is prolonged, and then, under the continuous flushing action of the hot air flow on the calcining chamber distribution plate 600, the alumina powder slides along the inclined plate of the calcining chamber distribution plate 600 to separate from the calcining chamber distribution plate 600, and finally rises with the hot air flow. Due to the interception of the alumina powder by the calcining chamber distribution plate 600, the calcination time of the alumina powder is prolonged and the alumina powder is further dispersed on the calcining chamber distribution plate 600, which meets the two conditions for improving the calcination effect of the alumina powder, so that the alumina powder is fully calcined, and finally the quality of the alumina microspheres obtained by sintering is improved.

[0021] Further, such as Figure 1 As shown, the utility model optimizes the structure of the calcining chamber distribution plate 600, and bends the edge of the calcining chamber distribution plate 600 toward the top of the furnace body 100, and the bend is an arc-shaped transition. By bending the edge of the calcining chamber distribution plate 600 to make it arc-shaped and upward, the alumina powder that slides to the edge of the calcining chamber distribution plate 600 can more easily detach from the calcining chamber distribution plate 600 along the bend.

[0022] Further, such as Figure 1 As shown, the utility model defines that the size of the multiple calcining chamber distribution plates 600 arranged along the height direction of the furnace body 100 decreases from bottom to top, and the bending angle of the calcining chamber distribution plates 600 increases from bottom to top. Through the above definition, the size and bending angle of the calcining chamber distribution plates 600 can be adapted to the calcination conditions of the alumina powder distributed at different heights in the calcining chamber 120. The alumina powder at a lower height has just been in contact with the hot air for calcination, and its residence time needs to be extended as much as possible, while the alumina powder at a higher height has been calcined to a certain extent, and the required calcination time is reduced, and the corresponding residence time requirement is also shortened. Therefore, the utility model performs the above optimization.

[0023] like Figure 1As shown, in order to improve the thermal insulation effect of the furnace body 100 and reduce the heat overflow, the utility model covers the inner wall of the furnace body 100 with an insulation layer 700 and a refractory layer 800 from the outside to the inside, the insulation layer 700 is formed by thermal insulation bricks, and the refractory layer (800) is formed by refractory bricks; and the furnace body 100 is made of steel.

[0024] like Figure 1 As shown, in the utility model, the lower part of the furnace body 100 is a cylindrical structure, the upper part of the furnace body 100 is a conical structure, and the top of the furnace body 100 is connected to the raw material outlet 400 through a horizontally extending channel. The cylindrical structure of the lower part of the furnace body 100 can provide sufficient combustion and calcination space for the combustion chamber 110 and the calcination chamber 120, and the conical structure of the upper part of the furnace body 100 can promote the aluminum oxide powder after calcination to quickly enter the channel connected to the raw material outlet 400 along with the hot air flow.

Claims

1. A fluidized bed furnace for calcining alumina microspheres, comprising a furnace body (100) having a cavity, the furnace body (100) being provided with a raw material inlet (200) communicating with the cavity, a gas burner (300) and a raw material outlet (400), characterized in that: The cavity of the furnace body (100) is divided into a lower combustion chamber (110) and an upper calcining chamber (120) by a plurality of combustion chamber distribution plates (500) arranged horizontally and at intervals. A gas nozzle (510) is arranged at the gap between the combustion chamber distribution plates (500). The gas burner (300) is connected to the combustion chamber (110), and the raw material inlet (200) is connected to the calcining chamber (120). A plurality of calcining chamber distribution plates (600) are arranged in the calcining chamber (120). The calcining chamber distribution plates (600) are fixed on the inner wall of the furnace body (100) and are evenly spaced along the height direction of the furnace body (100). The calcining chamber distribution plates (600) are bent plate structures composed of two inclined plates connected together, and the openings of the calcining chamber distribution plates (600) face the bottom of the furnace body (100).

2. The alumina microsphere calcining boiling furnace according to claim 1, characterized in that: The edge of the calcining chamber distribution plate (600) is bent toward the top of the furnace body (100), and the bending portion is in an arc-shaped transition.

3. The alumina microsphere calcining boiling furnace according to claim 2, characterized in that: The size of the calcining chamber distribution plate (600) decreases from bottom to top, and the bending angle of the calcining chamber distribution plate (600) increases from bottom to top.

4. The alumina microsphere calcining boiling furnace according to claim 1, characterized in that: The inner wall of the furnace body (100) is covered with a thermal insulation layer (700) and a refractory layer (800) in sequence from the outside to the inside; the thermal insulation layer (700) is formed by thermal insulation bricks, and the refractory layer (800) is formed by refractory bricks; the furnace body (100) is a steel furnace body.

5. The alumina microsphere calcining boiling furnace according to claim 1, characterized in that: The air nozzles (510) are evenly spaced in a circular pattern in the horizontal direction, and the upper aperture of the air nozzles (510) is smaller than the lower aperture of the air nozzles (510).

6. The alumina microsphere calcining boiling furnace according to claim 1, characterized in that: The lower part of the furnace body (100) is a cylindrical structure, the upper part of the furnace body (100) is a conical structure, and the top of the furnace body (100) is connected to the raw material outlet (400) through a horizontally extending channel.

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