An externally heated rotary kiln with an anti-corrosion lining

Abstract

The present invention provides an externally heated rotary kiln with an anti-corrosion lining, comprising a feeding system, a furnace head, a transmission system, a furnace body and a furnace tail, wherein the furnace head is arranged at one end of the furnace body, and the furnace tail is arranged at the other end of the furnace head, the feeding system comprises a feeding motor, a feeding bin, a feeding screw and a feeding gate valve, the feeding motor is connected to the furnace head through the feeding screw, a feeding bin is arranged on the feeding screw, and a feeding gate valve is arranged at the lower end of the feeding bin, the furnace head comprises a smoke exhaust port, a furnace head seal, a furnace head expansion compensation device, and a furnace head discharge port, the smoke exhaust port is arranged at the upper end of the furnace head, the furnace head discharge port is arranged at the lower end of the furnace head, and the furnace head is connected to the furnace body through the furnace head seal and the furnace head expansion compensation device. The rotary kiln of the present invention can calcine, activate, and regenerate granular and powdery materials, is particularly suitable for powdery materials, and has the characteristics of stable product quality and good regeneration effect.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon regeneration, in particular to an externally heated rotary kiln with an anti-corrosion lining. Background Art

[0002] At present, there are two methods for the regeneration of powdered activated carbon. One is the regeneration by smoldering in a clay pot, that is, using an earthen pot, loading the adsorption saturated powdered activated carbon into the pot, and then stacking the pots in a kiln in a certain stacking form, using wood, sawdust, coal and other combustion media to heat the pots in the stacking. Although this process is simple, the regeneration temperature is uneven, the insulation effect is relatively poor, and the temperature difference between high and low temperatures is large. Since the kiln body is made of bricks and cannot be sealed, a large amount of smoke will be discharged during the regeneration process, causing large-scale environmental pollution. Because natural cooling is used, continuous operation is not possible, resulting in low production efficiency, long production cycle, and high labor intensity. The second is the external heating rotary kiln, which uses electricity or fuel for external heating. The materials are heated evenly and can be produced continuously. The furnace tube material is 310S high temperature resistant stainless steel. The saturated activated carbon adsorbs various corrosive substances such as sulfur. High temperature sulfidation corrosion occurs under high temperature conditions, that is, at high temperatures of 700-1000°C, too much σ phase is precipitated at its grain boundaries, resulting in Cr deficiency near the grain boundaries, thereby reducing the grain boundary sulfur corrosion resistance and having a relatively short service life. Silicon carbide material is a ceramic sintered at high temperature, which has the characteristics of high temperature corrosion resistance and high hardness, but the shape and material size are limited. Patent ZL 2019 2 0353459.8 "A powdered activated carbon regeneration furnace for silicon carbide furnace tube material". If the silicon carbide furnace tube is damaged, it is difficult to replace the furnace tube. Summary of the invention

[0003] The technical problem solved by the present invention is to provide an externally heated rotary kiln with an anti-corrosion lining to solve the problems raised in the above background technology.

[0004] The technical problem solved by the present invention is achieved by adopting the following technical scheme: an externally heated rotary kiln with an anti-corrosion lining, comprising a feeding system, a furnace head, a transmission system, a furnace body and a furnace tail, wherein the furnace head is arranged at one end of the furnace body, and the furnace tail is arranged at the other end of the furnace head, the feeding system comprises a feeding motor, a feeding bin, a feeding screw and a feeding gate valve, the feeding motor is connected to the furnace head through the feeding screw, a feeding bin is arranged on the feeding screw, and a feeding gate valve is arranged at the lower end of the feeding bin, the furnace head comprises a smoke exhaust port, a furnace head seal, a furnace head expansion compensation device, and a furnace head discharge port, the smoke exhaust port is arranged at the upper end of the furnace head, the furnace head discharge port is arranged at the lower end of the furnace head, the furnace head is connected to the furnace body through the furnace head seal and the furnace head expansion compensation device, the transmission system comprises a rear supporting wheel, a front supporting wheel, a transmission large and small gear and a transmission motor, and the front end of the transmission system is arranged A front tugboat is provided, and a rear supporting wheel is provided at the rear end. A transmission motor is provided on the transmission system, and a transmission gear is provided at one end of the transmission motor. The furnace body comprises a furnace body furnace tube, a furnace body lining, a furnace body insulation, a furnace body heating cavity, a furnace body lining block and a foundation skid. The furnace body lining is arranged inside the furnace body furnace tube, and the furnace body shell is arranged outside the furnace body. A furnace body insulation is arranged inside the furnace body shell, and a foundation skid is arranged at the lower end of the furnace body shell. The furnace body furnace tube and the furnace body insulation form a furnace body heating cavity. The tail end of the furnace body is connected to the furnace tail and a furnace body lining block is provided. The furnace tail comprises a furnace tail seal, a furnace tail inspection port steam pipe and a discharge port. A furnace tail seal is provided on the furnace tail, the furnace tail inspection port is arranged at the upper end of the furnace tail, the discharge port is arranged at the lower end of the furnace tail, and the steam pipe is arranged at the tail end of the furnace tail and extends through the furnace tail into the furnace body furnace tube.

[0005] Furthermore, the furnace head and furnace tail are both configured as double-layer steel plate structures, and thermal insulation materials are filled between the double-layer steel plate structures.

[0006] Furthermore, a spring is provided on the furnace head expansion compensation device, and the spring is fixed to the furnace head expansion compensation device by bolts. A spiral and a turning plate are provided inside the furnace head expansion compensation device.

[0007] Furthermore, the furnace body lining is a U-shaped structure, which is naturally formed into an arch when spliced ​​in the circular furnace body and furnace tube, and the two wings of the U-shaped furnace body lining naturally form a turning plate of the furnace body.

[0008] Furthermore, a furnace lining stopper is installed at the furnace tail.

[0009] Furthermore, the material of the furnace lining may be one of silicon carbide, high chromium heat-resistant cast iron or high-temperature alloy.

[0010] Furthermore, a temperature control probe, a heating device and a heating control device are provided in the heating chamber of the furnace body, and the temperature control probe, the heating device and the heating control device form a temperature control loop.

[0011] Furthermore, the furnace body and furnace tubes are made of high-temperature stainless steel.

[0012] Furthermore, the steam pipe is insulated by fire-resistant heat-insulating materials.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the rotary kiln of the present invention can calcine, activate and regenerate granular and powdery materials, is particularly suitable for powdery materials, and has the characteristics of stable product quality and good regeneration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a front view of the furnace lining of the present invention.

[0016] Figure 3 It is a side view of the furnace lining of the present invention.

[0017] In the figure: 1-feeding motor; 2-feeding bin; 3-burner head; 4-smoke exhaust port; 5-burner head sealing device; 6-burner head expansion compensation device; 7-spring; 8-sealing ring; 9-bolt; 10-furnace body and furnace tube; 11-furnace body lining; 12-furnace body insulation; 13-furnace body heating chamber; 14-furnace body shell; 15-furnace body lining block; 16-furnace tail sealing device; 17-furnace tail; 18-furnace tail inspection port; 19-steam pipe; 20-discharge port; 21-rear supporting wheel; 22-foundation pry; 23-front supporting wheel; 24-transmission gears; 25-transmission motor; 26-burner head discharge port; 27-feeding screw; 28-feeding gate valve; 29-manhole. DETAILED DESCRIPTION

[0018] In order to make the technical means for realizing the present invention, the creative features, the objectives and effects to be achieved easy to understand, the present invention is further explained below in conjunction with specific diagrams. In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection, or an integral connection can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two elements.

[0019] Example 1

[0020] like Figure 1-3As shown, an externally heated rotary kiln with an anti-corrosion lining includes a feeding system, a furnace head 3, a transmission system, a furnace body and a furnace tail 17. The furnace head is arranged at one end of the furnace body, and the furnace tail 17 is arranged at the other end of the furnace head. The feeding system includes a feeding motor 1, a feeding bin 2, a feeding screw 27 and a feeding gate valve 28. The feeding motor 1 is connected to the furnace head 3 through the feeding screw 27. The feeding bin 2 is arranged on the feeding screw 27. The feeding gate valve 28 is arranged at the lower end of the feeding bin 2. The furnace head 3 includes a smoke exhaust port 4, a burner seal 5, a burner expansion compensation device 6, and a burner discharge port 26. The smoke exhaust port 4 is arranged at the upper end of the burner 3, and the burner discharge port 26 is arranged at the lower end of the burner 3. The burner 3 is connected to the furnace body through the burner seal 5 and the burner expansion compensation device 6. The transmission system includes a rear supporting wheel 21, a front supporting wheel 23, a transmission gear 24 and a transmission motor 25. The front end of the transmission system is provided with a front tugwheel 23, and the rear end is provided with a rear supporting wheel 21 for supporting the furnace body. The driving system is provided with a transmission motor 25, one end of which is provided with a transmission gear 24, the furnace body comprises a furnace body furnace tube 10, a furnace body lining 11, a furnace body insulation 12, a furnace body heating chamber 13, a furnace body lining block 15 and a foundation pry 22, the furnace body lining 11 is arranged inside the furnace body furnace tube 10, the furnace body shell 14 is arranged outside the furnace body, the furnace body insulation 12 is arranged inside the furnace body shell 14, the bottom end of the furnace body shell 14 is provided with a foundation pry 22, the furnace body furnace tube 10 and the furnace body insulation 12 form a furnace body heating chamber 13, the tail end of the furnace body is connected to the furnace tail 17 and is provided with a furnace lining block 15, the furnace tail 17 includes a furnace tail seal 16, a furnace tail inspection port 18, a steam pipe 19 and a discharge port 20, the furnace tail 17 is provided with a furnace tail seal 16, the furnace tail inspection port 18 is arranged at the upper end of the furnace tail 17, the discharge port 20 is arranged at the lower end of the furnace tail 17, the steam pipe 19 is arranged at the tail end of the furnace tail 17, and passes through the furnace tail 17 and extends into the furnace body furnace tube 10.

[0021] Example 2

[0022] like Figure 1-3As shown, an externally heated rotary kiln with an anti-corrosion lining includes a feeding system, a furnace head 3, a transmission system, a furnace body and a furnace tail 17. The furnace head is arranged at one end of the furnace body, and the furnace tail 17 is arranged at the other end of the furnace head. The feeding system includes a feeding motor 1, a feeding bin 2, a feeding screw 27 and a feeding gate valve 28. The feeding motor 1 is connected to the furnace head 3 through the feeding screw 27. The feeding bin 2 is arranged on the feeding screw 27. The feeding gate valve 28 is arranged at the lower end of the feeding bin 2. The furnace head 3 includes a smoke exhaust port 4, a burner seal 5, a burner expansion compensation device 6, and a burner discharge port 26. The smoke exhaust port 4 is arranged at the upper end of the burner 3, and the burner discharge port 26 is arranged at the lower end of the burner 3. The burner 3 is connected to the furnace body through the burner seal 5 and the burner expansion compensation device 6. The transmission system includes a rear supporting wheel 21, a front supporting wheel 23, a transmission gear 24 and a transmission motor 25. The front end of the transmission system is provided with a front tugwheel 23, and the rear end is provided with a rear supporting wheel 21 for supporting the furnace body. The driving system is provided with a transmission motor 25, one end of which is provided with a transmission gear 24, the furnace body comprises a furnace body furnace tube 10, a furnace body lining 11, a furnace body insulation 12, a furnace body heating chamber 13, a furnace body lining block 15 and a foundation pry 22, the furnace body lining 11 is arranged inside the furnace body furnace tube 10, the furnace body shell 14 is arranged outside the furnace body, the furnace body insulation 12 is arranged inside the furnace body shell 14, the bottom end of the furnace body shell 14 is provided with a foundation pry 22, the furnace body furnace tube 10 and the furnace body insulation 12 form a furnace body heating chamber 13, the tail end of the furnace body is connected to the furnace tail 17 and is provided with a furnace lining block 15, the furnace tail 17 includes a furnace tail seal 16, a furnace tail inspection port 18, a steam pipe 19 and a discharge port 20, the furnace tail 17 is provided with a furnace tail seal 16, the furnace tail inspection port 18 is arranged at the upper end of the furnace tail 17, the discharge port 20 is arranged at the lower end of the furnace tail 17, the steam pipe 19 is arranged at the tail end of the furnace tail 17, and passes through the furnace tail 17 and extends into the furnace body furnace tube 10.

[0023] Furthermore, the furnace head 3 and the furnace tail 17 are both configured as double-layer steel plate structures, and insulation materials are filled between the double-layer steel plate structures to prevent operators from being scalded.

[0024] Furthermore, a spring 7 is provided on the furnace head expansion compensation device 6, and a bolt 9 of the spring 7 is fixed to the furnace head expansion compensation device 6. A spiral and a turning plate are provided inside the furnace head expansion compensation device 6.

[0025] Furthermore, the furnace body lining 11 is a U-shaped structure, which is naturally formed into an arch when spliced ​​in the circular furnace body and furnace tube 10, preventing the furnace body lining 11 from falling off, and the two wings of the U-shaped furnace body lining 11 naturally form a turning plate of the furnace body.

[0026] Furthermore, a furnace lining stopper 15 is installed at the furnace tail 17 to prevent the furnace lining 11 from sliding axially toward the furnace tail.

[0027] Furthermore, the material of the furnace lining 11 may be one of silicon carbide, high chromium heat-resistant cast iron or high-temperature alloy.

[0028] Furthermore, a temperature control probe, a heating device and a heating control device are provided in the furnace body heating chamber 13, and the temperature control probe, the heating device and the heating control device form a temperature control loop to control the temperature of the rotary kiln furnace body furnace tube 10 in a temperature zone according to the material calcination requirements.

[0029] Furthermore, the furnace body and furnace tube 10 are made of high-temperature stainless steel.

[0030] Furthermore, the steam pipe 19 is insulated with fire-resistant heat-insulating materials to prevent corrosion and extend the service life.

[0031] The working principle of the present invention is as follows: start the transmission motor 25, drive the transmission gears to rotate 24, and the furnace body performs a rotary motion. Start the heating device to gradually increase the temperature of the furnace body and furnace tube 10 to reach the temperature required for calcining the material. Start the feeding motor 1 and start feeding according to the designed production capacity. The flue gas generated during the calcination of the material is discharged from the exhaust port 4 in reverse, and the calcined material is discharged from the discharge port 26. For materials that require steam activation, steam can be introduced through the steam pipe 19. For regeneration of powdered saturated activated carbon, the temperature in the high-temperature furnace chamber can reach 800-900°C, the regenerated activated carbon yield can reach more than 90%, and the iodine value and Yalan value recovery rate can reach 95%. The rotary kiln of the present invention can calcine, activate, and regenerate granular and powdered materials, and is particularly suitable for powdered materials, with the characteristics of stable product quality and good regeneration effect.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An externally heated rotary kiln with an anti-corrosion lining, comprising a feeding system, a furnace head, a transmission system, a furnace body and a furnace tail, Features: The burner head is arranged at one end of the furnace body, and the furnace tail is arranged at the other end of the burner head. The feeding system includes a feeding motor, a feeding bin, a feeding screw and a feeding gate valve. The feeding motor is connected to the burner head through the feeding screw. The feeding bin is arranged on the feeding screw, and the feeding gate valve is arranged at the lower end of the feeding bin. The burner head includes a smoke exhaust port, a burner head seal, a burner head expansion compensation device, and a burner head discharge port. The smoke exhaust port is arranged at the upper end of the burner head, and the burner head discharge port is arranged at the lower end of the burner head. The burner head is connected to the furnace body through the burner head seal and the burner head expansion compensation device. The transmission system includes a rear supporting wheel, a front supporting wheel, a transmission gear and a transmission motor. The front end of the transmission system is provided with a front supporting wheel, and the rear end is provided with a rear supporting wheel. The transmission system is provided with a transmission motor, and one end of the transmission motor is provided with a transmission gear. The furnace body includes a furnace tube, a furnace lining, furnace insulation, a furnace heating chamber, a furnace lining block and a foundation pry. The furnace lining is arranged at the furnace body furnace The furnace body is provided with a furnace shell outside, the furnace body is provided with a furnace body insulation inside the furnace body shell, a foundation pry is provided at the lower end of the furnace body shell, the furnace body tube and the furnace body insulation form a furnace body heating cavity, a furnace body lining block is provided at the connection between the tail end of the furnace body and the furnace tail, a furnace tail seal is provided on the furnace tail, a furnace tail inspection port is provided at the upper end of the furnace tail, a discharge port is provided at the lower end of the furnace tail, a steam pipe is provided at the tail end of the furnace tail, and extends through the furnace tail into the furnace body tube, the furnace head and the furnace tail are both provided A double-layer steel plate structure, with insulation material filled between the double-layer steel plate structure, a spring is arranged on the furnace head expansion compensation device, and the spring is fixed to the furnace head expansion compensation device through a sealing ring and bolts, an inner spiral and a flip plate are arranged inside the furnace head expansion compensation device, the furnace body lining is a U-shaped structure, which is naturally formed into an arch shape by being spliced ​​in the circular furnace body and furnace tube, and the two wings of the U-shaped furnace body lining naturally form the flip plate of the furnace body, and the material of the furnace body lining is one of silicon carbide, high chromium heat-resistant cast iron or high-temperature alloy.

2. An externally heated rotary kiln with an anti-corrosion lining as claimed in claim 1, Features: Install the furnace lining stopper at the furnace tail.

3. The externally heated rotary kiln with an anti-corrosion lining as claimed in claim 1, Features: A temperature control probe, a heating device and a heating control device are arranged in the heating cavity of the furnace body, and the temperature control probe, the heating device and the heating control device form a temperature control loop.

4. The externally heated rotary kiln with an anti-corrosion lining as claimed in claim 1, Features: The furnace body and furnace tube are made of high-temperature stainless steel.

5. The externally heated rotary kiln with an anti-corrosion lining as claimed in claim 1, Features: The steam pipe is insulated by fire-resistant heat-insulating materials.

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