High-efficiency catalytic pyrolysis furnace

Abstract

The utility model provides a kind of efficient catalytic pyrolysis furnace, comprising: preheating furnace, main pyrolysis furnace and cooling furnace;The conveying box is arranged in the middle of the preheating furnace, the main pyrolysis furnace and the cooling furnace, the inside of the conveying box is provided with double helix conveying auger, and the side of the top of the preheating furnace is fixedly installed with the discharge hopper.The utility model provides a kind of efficient catalytic pyrolysis furnace, by double helix conveying auger, waste catalyst containing platinum, rhodium is sequentially passed through preheating furnace, main pyrolysis furnace and cooling furnace, segmented temperature control and uniform delivery make the recovery rate of platinum, rhodium increase, different gas is added in preheating furnace, main pyrolysis furnace and cooling furnace to assist catalysis and cooling, effectively avoid noble metal oxidation, gradient pyrolysis and precision atmosphere control are realized synergistically.

Description

Technical Field

[0001] This utility model relates to the field of precious metal recycling equipment technology, and in particular to a high-efficiency catalytic pyrolysis furnace. Background Technology

[0002] Platinum and rhodium are important metallic elements, and the mineral deposits of these two rare metals are relatively scarce. They can be recovered and purified from some chemical slag to save resources.

[0003] In the refining process of platinum and rhodium powder, catalytic pyrolysis is a key step in removing organic matter (such as oil and carbon deposits) from waste catalysts and destroying the structure of the support (such as cordierite and alumina), which directly affects the subsequent dissolution efficiency and precious metal recovery rate.

[0004] In the refining process of platinum and rhodium powder, catalytic pyrolysis furnaces are used for refining. However, the temperature control precision of existing pyrolysis furnaces is low, and they mostly use overall heating, which cannot achieve gradient heating. This leads to incomplete removal of organic matter or excessive sintering of the carrier, which can easily cause platinum and rhodium oxidation and reduce reduction efficiency.

[0005] Therefore, it is necessary to provide a high-efficiency catalytic pyrolysis furnace to solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides a high-efficiency catalytic pyrolysis furnace, which solves the problems of low temperature control accuracy in existing pyrolysis furnaces, which mostly use overall heating and cannot achieve gradient heating, resulting in incomplete removal of organic matter or excessive sintering of the support, which easily causes platinum and rhodium oxidation and reduces reduction efficiency.

[0007] To solve the above-mentioned technical problems, this utility model provides a high-efficiency catalytic pyrolysis furnace, comprising: a preheating furnace, a main pyrolysis furnace, and a cooling furnace; A conveyor box is located between the preheating furnace, the main pyrolysis furnace, and the cooling furnace, and a double-helix conveying auger is installed inside the conveyor box. An atmosphere conditioning device is provided, comprising a hydrogen storage tank, an oxygen storage tank, a nitrogen storage tank, a first delivery pipe, a first flow meter, a second delivery pipe, a second flow meter, a third delivery pipe, and a third flow meter. The hydrogen storage tank is connected to the cooling furnace via the third delivery pipe and the third flow meter. The oxygen storage tank is connected to the preheating furnace via the first delivery pipe and the first flow meter. The nitrogen storage tank is connected to the main pyrolysis furnace via the second delivery pipe and the second flow meter.

[0008] Preferably, a feeding hopper is fixedly installed on one side of the top of the preheating furnace.

[0009] Preferably, a catalytic combustion chamber is provided on one side of the outer surface of the conveying box, and an exhaust pipe is provided on the top of the catalytic combustion chamber via an air pump.

[0010] Preferably, support bases are fixedly installed on both sides of the bottom of the preheating furnace, the main pyrolysis furnace, and the cooling furnace, and a controller is provided on the surface of the support base.

[0011] Preferably, a water pipe is provided on one side of the outer surface of the cooling furnace, and a drain pipe is provided on one side of the bottom of the cooling furnace.

[0012] Preferably, the double-helix conveying auger includes a driving component, a rotating column, a first large auger blade, a small auger blade, and a second large auger blade. The driving component is fixedly installed on one side of the outer surface of the conveying box. The end of the rotating column is fixedly connected to the output shaft end of the driving component via a coupling. A plurality of first large auger blades are equidistantly fixedly installed on one side of the outer surface of the rotating column. A plurality of small auger blades are equidistantly fixedly installed in the middle of the outer surface of the rotating column. A plurality of second large auger blades are equidistantly fixedly installed on the other side of the outer surface of the rotating column.

[0013] Preferably, a guide plate is fixedly installed on the inner wall surface of the conveying box.

[0014] Compared with related technologies, the high-efficiency catalytic pyrolysis furnace provided by this utility model has the following beneficial effects: This invention provides a high-efficiency catalytic pyrolysis furnace. By using a double-helix conveyor auger to sequentially pass waste catalyst containing platinum and rhodium through a preheating furnace, a main pyrolysis furnace, and a cooling furnace, the segmented temperature control and uniform conveying improve the recovery rate of platinum and rhodium. Different gases are added to the preheating furnace, the main pyrolysis furnace, and the cooling furnace to assist catalysis and cooling, effectively avoiding the oxidation of precious metals and synergistically achieving gradient pyrolysis and precise atmosphere control. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a first embodiment of a high-efficiency catalytic pyrolysis furnace provided by this utility model; Figure 2 for Figure 1 The diagram shows a side view of the atmosphere control device. Figure 3 for Figure 2 The enlarged schematic diagram at point A is shown below; Figure 4 This is a schematic diagram of the structure of a second embodiment of a high-efficiency catalytic pyrolysis furnace provided by this utility model.

[0016] Numbered in the diagram: 1. Preheating furnace, 2. Main pyrolysis furnace, 3. Cooling furnace, 4. Conveying box, 5. Double spiral conveyor, 6. Feed hopper, 7. Atmosphere conditioning device, 71. Hydrogen storage tank, 72. Oxygen storage tank, 73. Nitrogen storage tank, 74. First conveying pipe, 75. First flow meter, 76. Second conveying pipe, 77. Second flow meter, 78. Third conveying pipe, 79. Third flow meter, 8. Support base, 9. Controller, 10. Catalytic combustion box, 11. Tail gas emission pipe, 12. Water pipe, 13. Guide plate, 51. Drive component, 52. Rotating column, 53. First large auger blade, 54. Small auger blade, 55. Second large auger blade. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] First Embodiment

[0019] Please refer to the following: Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 This is a schematic diagram of the structure of a first embodiment of a high-efficiency catalytic pyrolysis furnace provided by this utility model; Figure 2 for Figure 1 The diagram shows a side view of the atmosphere control device. Figure 3 for Figure 1 The enlarged schematic diagram at point A is shown.

[0020] A high-efficiency catalytic pyrolysis furnace includes: a preheating furnace 1, a main pyrolysis furnace 2, and a cooling furnace 3; Conveying box 4 is located between the preheating furnace 1, the main pyrolysis furnace 2 and the cooling furnace 3, and a double spiral conveying auger 5 is installed inside the conveying box 4; Atmosphere conditioning device 7 includes a hydrogen storage tank 71, an oxygen storage tank 72, a nitrogen storage tank 73, a first delivery pipe 74, a first flow meter 75, a second delivery pipe 76, a second flow meter 77, a third delivery pipe 78, and a third flow meter 79. The hydrogen storage tank 71 is connected to the cooling furnace 3 through the third delivery pipe 78 and the third flow meter 79. The oxygen storage tank 72 is connected to the preheating furnace 1 through the first delivery pipe 74 and the first flow meter 75. The nitrogen storage tank 73 is connected to the main pyrolysis furnace 2 through the second delivery pipe 76 and the second flow meter 77.

[0021] A feeding hopper 6 is fixedly installed on one side of the top of the preheating furnace 1.

[0022] A catalytic combustion chamber 10 is provided on one side of the outer surface of the conveying box 4, and an exhaust pipe 11 is provided on the top of the catalytic combustion chamber 10 via an air pump.

[0023] The preheating furnace 1, the main pyrolysis furnace 2 and the cooling furnace 3 are all fixedly installed on both sides of the bottom of the furnace, and the surface of the support base 8 is provided with a controller 9.

[0024] A water pipe 12 is provided on one side of the outer surface of the cooling furnace 3, and a drain pipe is provided on one side of the bottom of the cooling furnace 3.

[0025] The outer shells of the preheating furnace 1, the main pyrolysis furnace 2, and the cooling furnace 3 are made of 310S stainless steel, and the inner lining is made of polycrystalline mullite fiberboard (temperature resistance 1600℃). The outer layer of the preheating furnace 1 and the main pyrolysis furnace 2 is wrapped with aluminum silicate insulation cotton to reduce the heat loss rate.

[0026] The preheating furnace 1 uses far-infrared heating tubes with a temperature control range of 200-400℃; the main pyrolysis furnace 2 has a built-in ring resistance wire heating assembly, which is equipped with a PID temperature controller and has a temperature control range of 600-1200℃; the cooling furnace 3 is equipped with a water cooling chamber with a temperature control range of 100-300℃ to prevent high-temperature materials from oxidizing upon contact with air; water pipe 12 is the water inlet pipe and the drain pipe is the water outlet pipe.

[0027] The working principle of the high-efficiency catalytic pyrolysis furnace provided by this utility model is as follows: During operation, waste catalyst containing platinum and rhodium is first poured into the hopper. The waste catalyst enters the preheating furnace for preheating. The double-screw conveyor auger 5 is started to transport the waste catalyst. The preheating furnace 1 is heated to 300°C, and oxygen is introduced through the oxygen storage tank 72 to oxidize and remove surface oil and carbon deposits.

[0028] After the material enters the main pyrolysis furnace 2 through the preheating furnace 1, the furnace body is heated to 900°C. Nitrogen gas is introduced into the main pyrolysis furnace 2 from the nitrogen storage tank 73 to destroy the carrier structure and expose the platinum and rhodium. The material enters the cooling furnace 3 after passing through the main pyrolysis furnace 2 and is cooled. Hydrogen is introduced through the hydrogen storage tank 71 to reduce platinum and rhodium oxides that may be generated at 200°C. At the same time, the material is cooled down to below 100°C by water cooling. After pyrolysis, the material is discharged from the outlet of the conveying box 4 and collected to enter the next dissolution process. The tail gas is treated by adsorption and combustion in the catalytic combustion box 10 and then discharged in compliance with standards.

[0029] Compared with related technologies, the high-efficiency catalytic pyrolysis furnace provided by this utility model has the following beneficial effects: This invention provides a high-efficiency catalytic pyrolysis furnace. Waste catalyst containing platinum and rhodium is sequentially passed through a preheating furnace 1, a main pyrolysis furnace 2, and a cooling furnace 3 via a double-helix conveying auger 5. Segmented temperature control and uniform conveying improve the recovery rate of platinum and rhodium. Different gases are added to the preheating furnace 1, the main pyrolysis furnace 2, and the cooling furnace 3 to assist catalysis and cooling, effectively avoiding the oxidation of precious metals and synergistically achieving gradient pyrolysis and precise atmosphere control.

[0030] Second Embodiment

[0031] Please refer to the following: Figure 4 Based on the first embodiment of this application which provides a high-efficiency catalytic pyrolysis furnace, the second embodiment of this application proposes another high-efficiency catalytic pyrolysis furnace. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0032] Specifically, the difference in the high-efficiency catalytic pyrolysis furnace provided in the second embodiment of this application is that the double-helix conveying auger 5 includes a driving component 51, a rotating column 52, a first large auger blade 53, a small auger blade 54, and a second large auger blade 55. The driving component 51 is fixedly installed on one side of the outer surface of the conveying box 4. The end of the rotating column 52 is fixedly connected to the output shaft end of the driving component 51 through a coupling. A plurality of first large auger blades 53 are equidistantly fixedly installed on one side of the outer surface of the rotating column 52. A plurality of small auger blades 54 are equidistantly fixedly installed in the middle of the outer surface of the rotating column 52. A plurality of second large auger blades 55 are equidistantly fixedly installed on the other side of the outer surface of the rotating column 52.

[0033] A guide plate 13 is fixedly installed on the inner wall surface of the conveying box 4.

[0034] The inclination of the guide plate 13 is adapted to the curvature of the large auger blade and the small auger blade 54 to enable the continued conveying of materials.

[0035] The working principle of the high-efficiency catalytic pyrolysis furnace provided by this utility model is as follows: During operation, the rotating column 52 first rotates under the control of the output shaft of the drive component 51. The first large auger blade 53 rotates to transport the material from the preheating furnace 1 into the main pyrolysis furnace 2. The small auger blade 54 transports the preheated material in the preheating furnace 1 into the main pyrolysis furnace 2. The second large auger blade 55 transports the material in the main pyrolysis furnace 2 to the cooling furnace 3 for cooling. The conveying efficiency of the small auger blade 54 is less than that of the first large auger blade 53 and the second large auger blade 55.

[0036] Compared with related technologies, the high-efficiency catalytic pyrolysis furnace provided by this utility model has the following beneficial effects: This utility model provides a high-efficiency catalytic pyrolysis furnace. By setting the blades of the conveying auger into three sections, the large blade, the small blade, and the large blade are respectively set in the preheating furnace 1, the main pyrolysis furnace 2, and the cooling furnace 3. The small blade extends the conveying time of the material in the main pyrolysis furnace 2, prolonging the catalytic effect. There is no need to adjust the speed of the motor output shaft of the double spiral conveying auger 5, thus improving the automation effect of the device.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-efficiency catalytic pyrolysis furnace, characterized in that, include: Preheating furnace, main pyrolysis furnace and cooling furnace; A conveyor box is located between the preheating furnace, the main pyrolysis furnace, and the cooling furnace, and a double-helix conveying auger is installed inside the conveyor box. An atmosphere conditioning device is provided, comprising a hydrogen storage tank, an oxygen storage tank, a nitrogen storage tank, a first delivery pipe, a first flow meter, a second delivery pipe, a second flow meter, a third delivery pipe, and a third flow meter. The hydrogen storage tank is connected to the cooling furnace via the third delivery pipe and the third flow meter. The oxygen storage tank is connected to the preheating furnace via the first delivery pipe and the first flow meter. The nitrogen storage tank is connected to the main pyrolysis furnace via the second delivery pipe and the second flow meter.

2. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, A feeding hopper is fixedly installed on one side of the top of the preheating furnace.

3. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, A catalytic combustion chamber is provided on one side of the outer surface of the conveying box, and an exhaust pipe is provided on the top of the catalytic combustion chamber via an air pump.

4. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, The preheating furnace, the main pyrolysis furnace, and the cooling furnace are all fixedly installed on both sides of their bottoms, and a controller is provided on the surface of the support base.

5. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, A water pipe is provided on one side of the outer surface of the cooling furnace, and a drain pipe is provided on one side of the bottom of the cooling furnace.

6. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, The double-helix conveying auger includes a driving component, a rotating column, a first large auger blade, a small auger blade, and a second large auger blade. The driving component is fixedly installed on one side of the outer surface of the conveying box. The end of the rotating column is fixedly connected to the output shaft end of the driving component through a coupling. Multiple first large auger blades are equidistantly fixedly installed on one side of the outer surface of the rotating column. Multiple small auger blades are equidistantly fixedly installed in the middle of the outer surface of the rotating column. Multiple second large auger blades are equidistantly fixedly installed on the other side of the outer surface of the rotating column.

7. The high-efficiency catalytic pyrolysis furnace according to claim 1, characterized in that, A guide plate is fixedly installed on the inner wall surface of the conveyor box.

Images