Rotary furnace for roasting spherical catalyst

Abstract

The utility model relates to the field of catalyst preparation equipment, and discloses a spherical catalyst roasting rotary furnace which comprises a rotary drum, a spiral material frying plate which spirally extends around the central axis of the rotary drum is arranged on the inner wall surface of the rotary drum, and a spiral guide groove which surrounds the central axis of the rotary drum is defined on the inner wall surface of the rotary drum; the heating piece can heat the spherical catalyst material in the rotary drum; the driving mechanism can drive the rotary drum and the spiral frying plate to rotate synchronously, and the spiral guide groove can guide the spherical catalyst material to roll in the rotary drum and convey the spherical catalyst material from the feeding end of the rotary drum to the discharging end of the rotary drum. According to the technical scheme, the rotary furnace is adopted to roast the spherical catalyst, the spiral frying plate is arranged in the rotary drum, and the advancing speed of the spherical catalyst is controlled through rotation of the spiral frying plate, so that insufficient roasting time caused by too high rolling speed of the spherical catalyst and rolling of the spherical catalyst during heating are avoided, heating is more uniform, and the service life of the spherical catalyst is prolonged. And the roasting effect is better.

Description

Technical Field

[0001] This utility model relates to the field of catalyst preparation equipment, specifically to a spherical catalyst roasting rotary furnace. Background Technology

[0002] In catalyst preparation, calcination is a crucial step in the preparation of almost all solid catalysts and their supports. It significantly influences the catalyst's structure, phase composition, grain size, surface acidity centers, and ultimately, its overall performance. Spherical catalysts possess many advantages over catalysts of other shapes, thus gaining widespread application.

[0003] Due to the high fluidity and easy rolling characteristics of spherical catalysts, mesh belt furnaces are usually used when calcining spherical catalysts to keep them in a static state. However, the static state of the spherical catalysts can easily lead to uneven calcination and poor product quality. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that existing technologies typically use mesh belt furnaces for calcining spherical catalysts, which keep the spherical catalysts in a static state during calcination. This static state of the spherical catalysts can easily lead to uneven calcination and poor product quality.

[0005] To achieve the above objectives, this utility model provides a spherical catalyst calcination rotary furnace, comprising:

[0006] The rotating drum has a spiral stir-frying plate that extends spirally around the central axis of the drum on its inner wall surface, thereby defining a spiral guide groove around the central axis of the drum on the inner wall surface of the drum.

[0007] Heating element, capable of heating the spherical catalyst material in the rotating drum; and,

[0008] The drive mechanism can drive the rotating drum and the spiral frying plate to rotate synchronously. The spiral guide groove can guide the spherical catalyst material to roll in the rotating drum and be transported from the feed end to the discharge end of the rotating drum.

[0009] In some embodiments, the rotating drum includes a guide section with a spiral stir-frying plate and a smooth section without a spiral stir-frying plate along its length. The smooth section is located at both ends of the rotating drum, and the guide section is located between the two smooth sections.

[0010] In some embodiments, the spherical catalyst calcination rotary kiln further includes a housing, with the middle part of the rotating drum disposed in the housing, the feed end and the discharge end extending out of the housing, a drive mechanism disposed at the feed end and / or the discharge end and capable of driving the rotating drum to rotate relative to the housing, and a heating element disposed between the housing and the rotating drum and located below the rotating drum 1.

[0011] In some embodiments, the driving mechanism includes a driving member and a gear ring sleeved outside the rotating drum. The output end of the driving member is connected to a transmission gear. The transmission gear meshes with the gear ring and can be driven by the driving member to rotate, so as to make the rotating drum rotate.

[0012] In some embodiments, the drive mechanism further includes a rolling ring sleeved on the outside of the rotating drum, and a rotatable roller disposed below the rolling ring, tangential to the rolling ring and rotatably connected to it.

[0013] In some embodiments, the heating power of the heating element varies along the length of the rotating drum, and the heating power of the heating element corresponding to the rotating drum includes multiple regions with different temperatures. The heating power of the multiple regions gradually increases along the direction from the feed end to the discharge end.

[0014] In some embodiments, the spherical catalyst roasting rotary kiln further includes temperature measuring elements, including a first temperature measuring element and a second temperature measuring element. The first temperature measuring element is located between the rotary drum and the housing and is at the same height as the axis of the rotary drum. The second temperature measuring element is located on the inner wall of the discharge end.

[0015] In some embodiments, an insulation layer is provided between the inner and outer walls of the enclosure.

[0016] In some embodiments, the heating element is a heating resistance wire.

[0017] In some embodiments, a support base is provided below the rotating drum to support the rotating drum, and an angle adjustment mechanism is provided below the support base, which can adjust the tilt angle of the rotating drum.

[0018] Through the above technical solution, this application adopts a rotary kiln to roast spherical catalysts. A spiral roasting plate is set in the rotary drum. The forward speed of the spherical catalyst is controlled by the rotation of the spiral roasting plate. This avoids the insufficient roasting time caused by the spherical catalyst rolling too fast in the rotary kiln. In addition, it can also make the spherical catalyst roll during heating, so that the heating is more uniform and the roasting effect is better. Attached Figure Description

[0019] Figure 1 This is a front view of the rotary kiln according to an embodiment of the present invention;

[0020] Figure 2 This is a left view of the rotary kiln according to an embodiment of the present invention;

[0021] Figure 3 This is a right view of the rotary kiln according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the spiral stir-fry plate according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Rotary drum; 11. Spiral feeding plate; 12. Feeding end; 13. Discharge end;

[0025] 2. Drive mechanism; 21. Drive component; 22. Gear ring; 23. Transmission gear; 24. Rolling ring; 25. Drag wheel;

[0026] 3. Heating element; 4. Housing;

[0027] 5. Temperature sensing element; 51. First temperature sensing element; 52. Second temperature sensing element;

[0028] 6. Feed box; 61. Feed inlet; 62. Feed pipe; 63. Exhaust gas outlet;

[0029] 7. Discharge box; 71. Discharge port; 72. Manhole;

[0030] 8. Support base; 9. Angle adjustment mechanism. Detailed Implementation

[0031] In this invention, unless otherwise stated, directional terms such as "up," "down," "left," "right," "inner," and "outer" are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] To address the problem in existing technologies where spherical catalysts are typically calcined in a mesh belt furnace, resulting in static calcination and uneven calcination, leading to poor product quality, this invention provides a rotary kiln for calcining spherical catalysts. Figure 1 As shown, the spherical catalyst roasting rotary furnace includes: a rotary drum 1, and a spiral roasting plate 11 extending spirally around the central axis of the rotary drum 1 on the inner wall surface of the rotary drum 1, as shown. Figure 4As shown, the spiral frying plate 11 defines a spiral guide groove around the central axis of the rotating drum 1 on the inner wall surface of the rotating drum 1. The spiral frying plate 11 is a strip plate welded to the inner wall of the rotating drum 1, with a thickness of 2-5mm and a height of 50-200mm. The two sides of the spiral frying plate 11 extend along a spiral path on the inner wall of the rotating drum 1. The rotating drum 1 and the spiral frying plate 11 are made of high-temperature resistant stainless steel. The heating element 3 can heat the spherical catalyst material in the rotating drum 1, so that the spherical catalyst is roasted in the rotating drum 1. The driving mechanism 2 can drive the rotating drum 1 and the spiral frying plate 11 to rotate synchronously. As the rotating drum 1 and the spiral frying plate 11 rotate, the spherical catalyst material rolls continuously in the spiral guide groove and moves toward the discharge end 13. Throughout the process, the spherical catalyst material remains at the bottom of the rotating drum 1. The forward speed of the spherical catalyst material can be controlled by controlling the rotation speed of the rotating drum 1 and the spiral frying plate 11, so that the spherical catalyst material can obtain sufficient calcination time. In addition, the rolling of the spherical catalyst material also makes the various parts of the spherical catalyst material heat up evenly.

[0033] Through the above technical solution, this application uses a rotary kiln, which is different from the mesh belt furnace commonly used in the field, to calcine spherical catalysts. By setting a spiral frying plate in the rotary drum, the rotation of the spiral frying plate controls the forward speed of the spherical catalysts, avoiding insufficient calcine time caused by the spherical catalysts rolling too fast in the rotary kiln. Furthermore, the spherical catalysts roll during heating, making the heating more uniform and the calcine effect better.

[0034] In some embodiments, the rotating drum 1 includes a guide section with a spiral stir-frying plate 11 and a gentle section without the spiral stir-frying plate 11 along its length, such as... Figure 1 As shown, the smooth sections are located at both ends of the rotating drum 1, and the guiding section is located between the two smooth sections. The spherical catalyst enters the rotating drum 1 through the feed end 12, rolls freely in the smooth sections, enters the guiding section, and moves along the spiral guiding groove to the smooth section at the discharge end 13. It then rolls out of the rotating drum 1 along the smooth section and leaves the rotating drum 1. The smooth section at the feed end 12 allows the spherical catalyst material to enter the spiral guiding groove of the guiding section along the smooth section. If the smooth section is not provided, and the spherical catalyst material is placed directly in the spiral guiding groove, the spherical catalyst material will accumulate and roll into the subsequent spiral guiding groove, which cannot guarantee sufficient calcination time.

[0035] like Figure 1As shown, the feed end 12 is connected to a feed box 6. The rotating drum 1 is rotatably connected to the feed box 6 and sealed with graphite packing. The top plate of the feed box 6 has a feed inlet 61. The feed box 6 also has a feed pipe 62. One end of the feed pipe 62 is connected to the feed inlet 61, and the other end extends into the rotating drum 1 and is close to the guide section. The spherical catalyst enters through the feed inlet 61 and is guided to the spiral stir-fry plate 11 through the feed pipe 62. Of course, the structure of the feed inlet is not limited to... Figure 1 The structure shown can also be modified without the feed pipe 62, allowing the spherical catalyst material to enter the feed box 6 through the feed inlet 61 and then roll freely into the rotating drum 1. For example... Figure 2 As shown, a tail gas outlet 63 is located diagonally above the feed box 6, near the feed inlet 61, for discharging gases generated during the roasting process. Figure 3 As shown, the discharge end 13 of the rotary drum 1 is rotatably connected to the discharge box 7. The discharge end 13 and the discharge box 7 are sealed with graphite packing. The bottom plate of the discharge box 7 is open and has a discharge port 71. The spherical catalyst material after calcination is discharged from the discharge port 71. A manhole 72 is also provided on the side plate of the discharge box 7 to facilitate workers to enter for maintenance. The manhole 72 is preferably located on the side plate opposite to the rotary drum 1 to facilitate observation of the working conditions inside the rotary drum 1.

[0036] In some embodiments, such as Figure 1 As shown, the rotary kiln for calcining spherical catalysts also includes a housing 4, with the middle portion of the rotating drum 1 located within the housing 4. The feed end 12 and the discharge end 13 extend outside the housing 4. A drive mechanism 2 is located on the feed end 12 and / or the discharge end 13 and is capable of driving the rotating drum 1 to rotate relative to the housing 4. A heating element 3 is located between the housing 4 and the rotating drum 1 to heat the middle portion of the rotating drum 1. Since the spherical catalyst is always located at the bottom of the rotating drum 1, the heating element 3 can be positioned below the rotating drum 1 between the housing 4 and the rotating drum 1.

[0037] In some embodiments, such as Figure 1 As shown, the drive mechanism 2 includes a drive component 21 and a gear ring 22 sleeved on the outside of the rotating drum 1, with the gear ring 22 fixedly connected to the rotating drum 1. A transmission gear 23 is connected to the output end of the drive component 21. The transmission gear 23 meshes with the gear ring 22, allowing the drive component 21 to drive the transmission gear 23 to rotate, thus causing the gear ring 22 to rotate and simultaneously drive the rotating drum 1 and the spiral frying plate 11. The drive mechanism 2 can be located at the feed end 12 or the discharge end 13, or both the feed end 12 and the discharge end 13 can be equipped with the drive mechanism 2, operating synchronously. It is important to note that the rotation direction of the drive component 21 should ensure that the spherical catalyst material can move along the spiral guide groove from the feed end 12 to the discharge end 13. The drive component 21 consists of a motor and a reducer, using frequency conversion control with a frequency of 5-30Hz. The residence time of the spherical catalyst material can be controlled by controlling the motor frequency, and the residence time is 4-8 hours.

[0038] In some embodiments, such as Figure 1 As shown, in order to guide the rotation direction of the rotating drum 1, the drive mechanism 2 also includes a rolling ring 24 sleeved on the outside of the rotating drum 1. The rolling ring 24 is fixedly connected to the rotating drum 1. A drag wheel 25 is provided below the rolling ring 24 and is tangentially connected to the rolling ring 24. A mounting seat is provided below the drag wheel 25 to fix the drag wheel 25.

[0039] In some embodiments, the heating power of the heating element 3 varies along the length of the rotating drum 1, and the heating power of the rotating drum 1 corresponding to the heating element 3 includes multiple regions with different temperatures. Figure 1 The dashed lines indicate the corresponding zones, with the heating power of multiple zones gradually increasing from the feed end 12 to the discharge end 13. This design allows the spherical catalyst to be heated in stages, preventing excessive temperature differences that could cause the spherical catalyst to crack.

[0040] In some embodiments, the spherical catalyst calcination rotary furnace further includes a temperature measuring element 5, which includes a first temperature measuring element 51 and a second temperature measuring element 52. The first temperature measuring element 51 is located between the rotating drum 1 and the housing 4, and does not rotate with the rotating drum 1. The first temperature measuring element 51 is at the same height as the axis of the rotating drum 1. Figure 1 As shown, the first temperature sensing element 51 is correspondingly arranged with the partitions of the rotating drum 1, with each partition having its own first temperature sensing element 51 to measure the temperature of each partition. The second temperature sensing element 52 is located on the inner wall of the discharge end 13 and rotates with the rotating drum 1 to measure the temperature of the spherical catalyst after calcination. The temperature sensing element 5 is a thermocouple or other temperature sensing device. Since the first temperature sensing element 51 is stationary, it can be set as a wired thermocouple, while the second temperature sensing element 52, which rotates with the drum 1, is a wireless thermocouple. In other embodiments, the second temperature sensing element 52 can also be a wired thermocouple, with a hole made in the discharge box 7, through which the second temperature sensing element 52 is inserted into the cavity of the discharge end 13 to measure the temperature of the spherical catalyst after calcination.

[0041] In some embodiments, such as Figure 1 As shown, an insulation layer is provided between the inner and outer walls of the box 4.

[0042] In some embodiments, the heating element 3 is a heating resistance wire, or it can be a silicon carbide rod, or it can be heated by a burner, with a heating temperature of 700℃-1000℃.

[0043] In some embodiments, such as Figure 1As shown, a support base 8 is provided below the rotating drum 1 to support the rotating drum 1. The mounting seats below the housing 4, the drive component 21, and the drag wheel 25 are all located on the support base 8. An angle adjustment mechanism 9 is provided below the support base 8. The angle adjustment mechanism 9 can adjust the tilt angle of the rotating drum 1, with a tilt angle of 0°-2°. By adjusting the tilt angle of the rotating drum 1, the residence time of the material can be controlled.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A spherical catalyst calcination rotary kiln characterized by, include: Rotary drum (1), the inner wall surface of the rotary drum (1) is provided with a spiral stir-frying plate (11) that extends spirally around the central axis of the rotary drum (1) to define a spiral guide groove around the central axis of the rotary drum (1) on the inner wall surface of the rotary drum (1); Heating element (3), said heating element (3) being capable of heating the spherical catalyst material in the rotating drum (1); and, The driving mechanism (2) can drive the rotating drum (1) and the spiral frying plate (11) to rotate synchronously. The spiral guide groove can guide the spherical catalyst material to roll in the rotating drum (1) and be conveyed from the feed end (12) of the rotating drum (1) to the discharge end (13).

2. The spherical catalyst calcination rotary kiln according to claim 1, characterized in that, The rotating drum (1) includes a guide section with the spiral stir-frying plate (11) and a gentle section without the spiral stir-frying plate (11) along its length. The gentle section is located at both ends of the rotating drum (1), and the guide section is located between the two gentle sections.

3. The spherical catalyst calcination rotary kiln according to claim 1, characterized in that, The spherical catalyst calcination rotary furnace also includes a housing (4), the middle part of the rotating drum (1) is located in the housing (4), the feed end (12) and the discharge end (13) extend out of the housing (4), the drive mechanism (2) is located at the feed end (12) and / or the discharge end (13) and can drive the rotating drum (1) to rotate relative to the housing (4), and the heating element (3) is located between the housing (4) and the rotating drum (1) and below the rotating drum (1).

4. The spherical catalyst calcination rotary kiln according to claim 3, characterized in that The drive mechanism (2) includes a drive member (21) and a gear ring (22) sleeved on the outside of the rotating drum (1). The output end of the drive member (21) is connected to a transmission gear (23). The transmission gear (23) meshes with the gear ring (22) and can be driven by the drive member (21) to rotate, so that the rotating drum (1) rotates.

5. A spherical catalyst calcination rotatory furnace according to claim 4, characterized in that, The drive mechanism (2) also includes a rolling ring (24) sleeved on the outside of the rotating drum (1) and a trolley (25) located below the rolling ring (24) and tangentially connected to the rolling ring (24) and rotatably connected to it.

6. The spherical catalyst calcination rotary kiln according to claim 3, characterized in that, The heating element (3) has different heating power along the length of the rotating drum (1). The heating power of the rotating drum (1) corresponding to the heating element (3) includes multiple regions with different temperatures. The heating power of the multiple regions gradually increases along the direction from the feed end (12) to the discharge end (13).

7. The spherical catalyst calcination rotary kiln according to claim 3, characterized in that, The spherical catalyst roasting rotary furnace also includes a temperature measuring element (5), which includes a first temperature measuring element (51) and a second temperature measuring element (52). The first temperature measuring element (51) is located between the rotating drum (1) and the box body (4) and is at the same height as the axis of the rotating drum (1). The second temperature measuring element (52) is located on the inner wall of the discharge end (13).

8. The spherical catalyst calcination rotary kiln according to claim 3, characterized in that, An insulation layer is provided between the inner and outer walls of the box (4).

9. The spherical catalyst calcination rotary kiln according to claim 1, characterized in that, The heating element (3) is a heating resistance wire.

10. The rotary kiln for calcining spherical catalysts according to claim 1, characterized in that, A support base (8) is provided below the rotating drum (1) to support the rotating drum (1). An angle adjustment mechanism (9) is provided below the support base (8), and the angle adjustment mechanism (9) can adjust the tilt angle of the rotating drum (1).

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