Horizontal calcining furnace for calcining pearl powder

Abstract

The utility model discloses a horizontal calcining furnace for calcining pearl powder, which relates to the technical field of pearl powder processing, and comprises a calcining barrel, a feeding auger is rotatably arranged in the calcining barrel, the feeding auger and the calcining barrel are coaxially arranged, and a combustion barrel is fixedly covered outside the calcining barrel. According to the pearl powder calcining device, natural gas is sprayed out through the multiple swirl nozzles to heat the calcining barrel, stable flame swirl is formed through the multiple swirl nozzles, and therefore the calcining barrel can be stably and evenly heated, and moving pearl powder can be evenly calcined; meanwhile, high-temperature waste gas generated after combustion enters the cavity interlayer in the combustion barrel and is exhausted after exchanging heat with the combustion barrel, the heat preservation and heat insulation effects on the combustion barrel can be achieved through the waste gas, the heat loss speed is reduced while heat is fully utilized, and the calcination effect of energy conservation and emission reduction is achieved.

Description

A horizontal calcining furnace for calcining pearlite powder Technical Field

[0001] This utility model relates to the field of pearlescent powder processing technology, and in particular to a horizontal calcining furnace for calcining pearlescent powder. Background Technology

[0002] Calcination of pearlescent powder is a crucial step in its preparation, directly affecting the color, luster, and properties of the finished product. Calcination primarily serves to crystallize the titanium compounds (such as titanium dioxide) coated on the mica substrate, forming a stable crystal structure that imparts unique optical effects (such as interference colors and metallic luster) to the pearlescent powder. Strict control of calcination temperature and time is essential. Excessive temperature may lead to overgrowth or structural damage, while insufficient time may compromise crystal integrity.

[0003] Most existing pearl powder calcination equipment uses a spiral feeding structure to transport pearl powder and calcine it during the transport process. However, it has certain drawbacks, such as unreasonable burner arrangement leading to local high temperature burning of materials or local under-burning; the direct emission of flue gas after combustion causes heat waste. Therefore, a horizontal calcination furnace for pearl powder calcination is needed. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a horizontal calcining furnace for calcining pearl powder, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a horizontal calcining furnace for calcining pearlite powder, comprising a calcining barrel, a rotatably mounted feeding auger inside the calcining barrel, the feeding auger being coaxially arranged with the calcining barrel, a combustion barrel being fixedly covered on the outside of the calcining barrel, a drive mechanism for driving the feeding auger to rotate being installed on one side of the calcining barrel, the drive mechanism being prior art and not described in detail here, a feed hopper and a discharge pipe being installed at both ends of the calcining barrel, the feed hopper and the discharge pipe being located on the upper and lower sides of the calcining barrel respectively;

[0006] A ring tube is movably fitted on the outside of the calcining barrel. Multiple swirling nozzles are evenly distributed on the ring tube. The ends of the swirling nozzles are inclined toward the surface of the calcining barrel, and the extension direction of the swirling nozzles is deviated from the axis of the calcining barrel.

[0007] The combustion chamber is equipped with a cavity interlayer. The exhaust gas from the combustion of natural gas injected from the ring pipe enters the cavity interlayer of the combustion chamber and is discharged after exchanging heat with the combustion chamber.

[0008] Preferably, a heat exchange plate is fixed on the outer surface of the calcining barrel. Multiple heat exchange plates are arranged and distributed circumferentially along the outer surface of the calcining barrel. Each heat exchange plate corresponds to a multiple swirling nozzle, and the heat exchange plate is located at the front end of the swirling nozzle in the extension direction.

[0009] Preferably, multiple sets of ring pipes and heat exchange plates are provided, with each set of ring pipes and heat exchange plates corresponding to the other.

[0010] Multiple sets of ring pipes are fixed and connected by gas supply pipes, one end of which is fixed through one end of the combustion chamber and extends to the outside of the combustion chamber.

[0011] Preferably, the multiple sets of ring pipes are distributed with varying spacing from one end of the discharge pipe to the other end of the feed hopper, and the distance between two adjacent sets of ring pipes closer to the discharge pipe is greater than the distance between two adjacent sets of ring pipes closer to the feed hopper.

[0012] Preferably, the cavity interlayer of the combustion barrel includes a heat exchange channel, which forms a channel that surrounds and covers the periphery of the combustion barrel. The end of the heat exchange channel near the feed hopper is provided with a first air inlet that communicates with the inside of the combustion barrel, and the end of the heat exchange channel near the discharge pipe is provided with an exhaust port.

[0013] An exhaust pipe is connected to the exhaust port.

[0014] Preferably, a heat exchange chamber is formed inside the feed auger, and the end of the feed auger near the discharge pipe is rotatably connected to the exhaust pipe, and the heat exchange chamber is connected to the exhaust pipe.

[0015] The end of the feeding auger near the feed hopper has a rotating air intake structure. The air intake structure covers the outside of the feeding auger and is rotated and sealed to the feeding auger. The lower end of the air intake structure is connected to the inside of the combustion barrel through an exhaust gas conveying pipe.

[0016] Preferably, the air intake structure includes an air distribution hood, which is an annular body with an internal cavity and an open inner side. Both sides of the air distribution hood are rotatably connected to the feed auger through sealed bearings.

[0017] The feed auger is located inside the gas distribution hood and has multiple second air inlets evenly distributed around its periphery. The second air inlets connect the inside of the gas distribution hood to the heat exchange chamber. One end of the exhaust gas delivery pipe is fixedly inserted through the gas distribution hood and connected to it, while the other end of the exhaust gas delivery pipe is fixedly inserted through the combustion barrel and connected to the inside of the combustion barrel.

[0018] Preferably, the lower end of the exhaust pipe is rotatably connected to and communicates with the feed auger through a second branch pipe, and one side of the exhaust pipe is fixed to and communicates with the exhaust hole through a first branch pipe.

[0019] In summary, the technical effects and advantages of this utility model are as follows:

[0020] This invention utilizes multiple swirling nozzles to spray natural gas into a calcining barrel, thereby calcining the pearlescent powder within. The multiple nozzles create a stable flame swirl, ensuring stable and uniform heating of the calcining barrel and even calcination of the moving pearlescent powder. This results in high calcination efficiency. Simultaneously, the high-temperature exhaust gas generated after combustion enters the hollow interlayer within the combustion barrel, exchanges heat with the barrel, and is then discharged. This exhaust gas effectively insulates the combustion barrel, minimizing heat loss while maximizing heat utilization, thus achieving energy conservation and emission reduction. Furthermore, the variable-pitch distribution design of multiple ring pipes allows for more efficient calcination of the pearlescent powder immediately upon entering the barrel, accelerating crystallization on its surface. As the pearlescent powder progresses, the heat transfer gradually decreases, stabilizing the crystallization process and ensuring high efficiency. This avoids over-calcination that could damage the pearlescent powder due to consistently applying the same calcination intensity, thus guaranteeing the quality of the finished product. Attached Figure Description

[0021] Figure 1 is a three-dimensional structural diagram of this embodiment;

[0022] Figure 2 is a cross-sectional view of the combustion chamber in this embodiment;

[0023] Figure 3 is a cross-sectional view of the calcining barrel, the combustion barrel, and the feeding auger in this embodiment;

[0024] Figure 4 is an enlarged view of the structure at point A in Figure 3;

[0025] Explanation of icon numbers:

[0026] 1. Calcination barrel; 11. Feed hopper; 12. Discharge pipe; 13. Heat exchange plate; 2. Combustion barrel; 21. Heat exchange channel; 211. First air inlet; 212. Exhaust port; 3. Feed auger; 31. Heat exchange chamber; 32. Second air inlet; 4. Drive mechanism; 5. Ring pipe; 51. Swirl nozzle; 52. Gas delivery pipe; 6. Gas distribution hood; 61. Sealed bearing; 7. Waste gas delivery pipe; 8. Exhaust pipe; 81. First branch pipe; 82. Second branch pipe. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] Example: Referring to Figures 1-4, a horizontal calcining furnace for calcining pearl powder includes a calcining barrel 1, a rotatably mounted feeding auger 3 inside the calcining barrel 1, the feeding auger 3 being coaxially arranged with the calcining barrel 1, a combustion barrel 2 being fixedly covered on the outside of the calcining barrel 1, a drive mechanism 4 for driving the feeding auger 3 to rotate being installed on one side of the calcining barrel 1, and a feed hopper 11 and a discharge pipe 12 being installed at both ends of the calcining barrel 1, the feed hopper 11 and the discharge pipe 12 being located on the upper and lower sides of the calcining barrel 1, respectively.

[0029] A ring tube 5 is movably sleeved on the outside of the calcining barrel 1. Multiple swirling nozzles 51 are evenly distributed on the ring tube 5. The ends of the swirling nozzles 51 are inclined toward the surface of the calcining barrel 1, and the extension direction of the swirling nozzles 51 is deviated from the axis of the calcining barrel 1.

[0030] The combustion chamber 2 is equipped with a cavity interlayer. The exhaust gas from the combustion of natural gas injected from the ring pipe 5 enters the cavity interlayer of the combustion chamber 2 and is discharged after exchanging heat with the combustion chamber 2.

[0031] Based on the above structure, during the calcination process, natural gas is injected through multiple swirling nozzles 51 (which then burns) to heat the calcination barrel 1, thereby calcining the pearlescent powder present in the calcination barrel 1. The multiple swirling nozzles 51 form a stable flame swirling flow, which can stably and uniformly heat the calcination barrel 1 and uniformly calcine the moving pearlescent powder, resulting in high calcination efficiency. At the same time, the high-temperature exhaust gas generated after combustion (generally exhaust temperature > 400℃) enters the cavity interlayer inside the combustion barrel 2 and is discharged after exchanging heat with the combustion barrel 2. The exhaust gas can be used to insulate the combustion barrel 2, reducing the rate of heat loss while making full use of heat, thus achieving the calcination effect of energy saving and emission reduction.

[0032] Furthermore, a heat exchange plate 13 is fixed on the outer surface of the calcining barrel 1. Multiple heat exchange plates 13 are arranged and distributed circumferentially along the outer surface of the calcining barrel 1. Each heat exchange plate 13 corresponds to a multiple swirling nozzle 51, and the heat exchange plate 13 is located at the front end of the swirling nozzle 51 in the extending direction.

[0033] By setting up the heat exchange plate 13, the contact area between the flame and the calcining barrel 1 can be expanded, thereby heating the calcining barrel 1 faster, improving the utilization efficiency of the flame heat, and further improving the calcination efficiency.

[0034] Furthermore, multiple sets of ring pipes 5 and heat exchange plates 13 are provided, with multiple sets of ring pipes 5 and multiple sets of heat exchange plates 13 corresponding one to one.

[0035] Multiple sets of ring pipes 5 are fixed and connected by gas supply pipes 52. One end of the gas supply pipe 52 is fixedly passed through one end of the combustion barrel 2 and extends to the outside of the combustion barrel 2.

[0036] It should be noted that, in order to facilitate the combustion of natural gas after it is ejected from the swirl nozzle 51, an electronic ignition mechanism (which is existing technology and will not be described in detail here) can be installed inside the combustion tank 2 to facilitate ignition. The gas transmission pipe 52 is connected to an external natural gas transmission pipeline (or natural gas transmission equipment) for the purpose of transporting natural gas.

[0037] Setting up multiple sets of ring pipes 5 and multiple sets of heat exchange plates 13 can ensure full coverage of the calcining barrel 1;

[0038] In addition, multiple sets of ring pipes 5 are distributed with varying distances from one end of the discharge pipe 12 to the other end of the feed hopper 11. The distance between two adjacent sets of ring pipes 5 near the discharge pipe 12 is greater than the distance between two adjacent sets of ring pipes 5 near the feed hopper 11. This allows for more efficient calcination of the pearlescent powder that has just entered the calcining barrel 1, enabling the pearlescent powder to crystallize more quickly on its surface. At the same time, as the pearlescent powder moves forward, the heat transfer to the pearlescent powder is gradually reduced, making the crystallization process of the pearlescent powder more stable. This ensures crystallization efficiency while avoiding the risk of over-calcination and damage to the pearlescent powder caused by maintaining the same calcination intensity, thus ensuring the quality of the finished product.

[0039] Furthermore, the cavity interlayer of the combustion barrel 2 includes a heat exchange channel 21, which forms a channel (such as spiral extension or serpentine tubular extension) that surrounds and covers the periphery of the combustion barrel 2. The end of the heat exchange channel 21 near the feed hopper 11 is provided with a first air inlet 211 that communicates with the inside of the combustion barrel 2, and the end of the heat exchange channel 21 near the discharge pipe 12 is provided with an exhaust port 212. The exhaust gas after combustion enters the heat exchange channel 21 through the first air inlet 211 and continuously exchanges heat with the combustion barrel 2 in the heat exchange channel 21. Then it is discharged through the exhaust port 212, thus completing the reuse of the residual heat in the exhaust gas.

[0040] An exhaust pipe 8 is connected to the exhaust port 212.

[0041] Furthermore, a heat exchange chamber 31 is formed inside the feed auger 3, and the end of the feed auger 3 near the discharge pipe 12 is rotatably connected to the exhaust pipe 8, and the heat exchange chamber 31 is connected to the exhaust pipe 8.

[0042] The end of the feeding auger 3 near the feed hopper 11 has a rotating air intake structure. The air intake structure covers the outside of the feeding auger 3 and is rotatably and sealed to the feeding auger 3. The lower end of the air intake structure is connected to the inside of the combustion barrel 2 through the exhaust gas conveying pipe 7.

[0043] By setting up the heat exchange chamber 31, some of the exhaust gas after combustion can enter the heat exchange chamber 31 and exchange heat with the feed auger 3, so that the feed auger 3 itself has a certain temperature, thereby making the heat distribution in the calcining barrel 1 more uniform, avoiding the internal calcining temperature imbalance caused by the feed auger 3 being too low, and using the residual heat of the exhaust gas to balance the calcining temperature, further improving the quality of the finished product.

[0044] Furthermore, the air intake structure includes an air distribution hood 6, which is an annular body with an internal cavity and an opening on the inner side. Both sides of the air distribution hood 6 are rotatably connected to the feed auger 3 through sealed bearings 61.

[0045] The feed auger 3 is located inside the gas distribution hood 6 and has multiple second air inlets 32 evenly opened on its periphery. The second air inlets 32 connect the inner side of the gas distribution hood 6 with the heat exchange chamber 31. One end of the exhaust gas conveying pipe 7 is fixedly inserted through the gas distribution hood 6 and connected to the gas distribution hood 6. The other end of the exhaust gas conveying pipe 7 is fixedly inserted through the combustion barrel 2 and connected to the inner side of the combustion barrel 2.

[0046] The lower end of the exhaust pipe 8 is rotatably connected to the feed auger 3 via the second branch pipe 82, and one side of the exhaust pipe 8 is fixed to and connected to the exhaust hole 212 via the first branch pipe 81.

[0047] The working principle of this utility model is as follows: In daily use, the drive mechanism 4 first drives the feeding auger 3 to rotate. At the same time, the pearlescent powder to be calcined can be fed into the calcining barrel 1 from the feed hopper 11 through the feeding mechanism (such as a belt feeder). Under the action of the feeding auger 3, the pearlescent powder moves towards the discharge pipe 12. Simultaneously, the gas supply pipe 52 sends external natural gas into the ring pipe 5, which is finally sprayed out and burned by the swirl nozzle 51, forming a flame swirl covering the calcining barrel 1. This allows for stable and uniform heating of the calcining barrel 1, uniformly calcining the moving pearlescent powder, resulting in high calcination efficiency. Furthermore, the high-temperature waste generated after combustion... Part of the gas enters the heat exchange channel 21 through the first air inlet 211 and continuously exchanges heat with the combustion chamber 2 in the heat exchange channel 21. Then it is discharged through the exhaust port 212, which can use the exhaust gas to keep the combustion chamber 2 warm. The other part enters the heat exchange chamber 31 through the exhaust gas delivery pipe 7 and the gas distribution hood 6, and exchanges heat with the feed auger 3. This makes the feed auger 3 have a certain temperature, so that the heat distribution in the calcining barrel 1 is more uniform. This avoids the internal calcining temperature imbalance caused by the feed auger 3 being too low. While making full use of the heat, it reduces the rate of heat loss and achieves the calcining effect of energy saving and emission reduction.

[0048] This utility model has been described with reference to the above-described embodiments and accompanying drawings. However, the above embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. On the contrary, modifications and equivalent provisions included in the spirit and scope of the claims are all included within the scope of this utility model.

Claims

1. A horizontal calcining furnace for calcining pearlite powder, comprising a calcining barrel, wherein a rotatably mounted feeding auger is disposed inside the calcining barrel, the feeding auger being coaxially arranged with the calcining barrel, a combustion barrel being fixedly covered outside the calcining barrel, a drive mechanism for driving the feeding auger to rotate is installed on one side of the calcining barrel, and a feed hopper and a discharge pipe are respectively installed at both ends of the calcining barrel, the feed hopper and the discharge pipe being located on the upper and lower sides of the calcining barrel, characterized in that: The calcining barrel is movably fitted with a ring pipe, and the ring pipe is evenly distributed with multiple swirling nozzles. The ends of the swirling nozzles are inclined toward the surface of the calcining barrel, and the extension direction of the swirling nozzles is deviated from the axis of the calcining barrel. The combustion barrel is provided with a cavity jacket. The exhaust gas after the natural gas sprayed from the ring pipe enters the cavity jacket of the combustion barrel and is discharged after exchanging heat with the combustion barrel.

2. A horizontal calcining furnace for calcining pearlescent powder according to claim 1, characterized in that: A heat exchange plate is fixed on the outer surface of the calcining barrel. Multiple heat exchange plates are arranged and distributed circumferentially along the outer surface of the calcining barrel. Each heat exchange plate corresponds to a multiple swirling nozzle, and the heat exchange plate is located at the front end of the swirling nozzle in the extending direction.

3. A horizontal calcining furnace for calcining pearlescent powder according to claim 2, characterized in that: Multiple sets of the ring pipes and heat exchange plates are provided, and the multiple sets of ring pipes and heat exchange plates correspond one-to-one; the multiple sets of ring pipes are fixed and connected to each other by gas supply pipes, and one end of the gas supply pipe is fixedly inserted through one end of the combustion barrel and extends to the outside of the combustion barrel.

4. A horizontal calcining furnace for calcining pearlescent powder according to claim 3, characterized in that: The multiple sets of ring pipes are distributed with varying distances from one end of the discharge pipe to the other end of the feed hopper. The distance between two adjacent sets of ring pipes closer to the discharge pipe is greater than the distance between two adjacent sets of ring pipes closer to the feed hopper.

5. A horizontal calcining furnace for calcining pearlescent powder according to claim 1, characterized in that: The cavity interlayer of the combustion barrel includes a heat exchange channel, which forms a channel that surrounds and covers the periphery of the combustion barrel. The end of the heat exchange channel near the feed hopper has a first air inlet that communicates with the inside of the combustion barrel, and the end of the heat exchange channel near the discharge pipe has an exhaust port. An exhaust pipe is connected to the exhaust port.

6. A horizontal calcining furnace for calcining pearlescent powder according to claim 5, characterized in that: A heat exchange chamber is formed inside the feed auger. The end of the feed auger near the discharge pipe is rotatably connected to the exhaust pipe, and the heat exchange chamber is connected to the exhaust pipe. A rotating air intake structure is formed at the end of the feed auger near the feed hopper. The air intake structure covers the outside of the feed auger and is rotatably and sealingly connected to the feed auger. The lower end of the air intake structure is connected to the inside of the combustion barrel through an exhaust gas conveying pipe.

7. A horizontal calcining furnace for calcining pearlescent powder according to claim 6, characterized in that: The air intake structure includes an air distribution hood, which is an annular body with an internal cavity and an open inner side. Both sides of the air distribution hood are rotatably connected to the feed auger through sealed bearings. The feed auger has multiple second air intake holes evenly opened on its periphery inside the air distribution hood. The second air intake holes connect the inner side of the air distribution hood to the heat exchange chamber. One end of the exhaust gas conveying pipe is fixedly inserted through the air distribution hood and connected to it. The other end of the exhaust gas conveying pipe is fixedly inserted through the combustion barrel and connected to the inner side of the combustion barrel.

8. A horizontal calcining furnace for calcining pearlescent powder according to claim 6, characterized in that: The lower end of the exhaust pipe is rotatably connected to and communicates with the feed auger through the second branch pipe, and one side of the exhaust pipe is fixed to and communicates with the exhaust hole through the first branch pipe.

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