Reaction kettle

By combining the stirring shaft and stirring assembly in the reactor, and using flip and vibration technology, the stirring problem caused by asphalt viscosity is solved, the processing efficiency and discharge efficiency of asphalt are improved, and the rapid flow and full stirring of asphalt are achieved.

CN119236858AActive Publication Date: 2025-01-03TANGSHAN KOPPERS KAILUAN CARBON CHEM
View PDF 6 Cites 0 Cited by

Patent Information

Application Number
CN202411782731.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-01-03
Estimated Expiration
2044-12-06

AI Technical Summary

Technical Problem

The viscosity of asphalt is high, which causes resistance to the mixing motor during the working process, making it difficult for asphalt in some areas to be fully stirred, and the processing efficiency is insufficient.

Method used

A reactor is designed, using a structure that combines a stirring shaft and a stirring assembly. By combining the stirring blades and the drive blades, the bitumen flows and is fully stirred, while using vibrating parts and dredging. The parts reduce the possibility of bond blockage and discharge blockage.

Benefits of technology

The mixing efficiency and discharge efficiency of asphalt are improved, the possibility of bonding blockage and discharge port blockage is reduced, and the rapid flow and sufficient stirring of asphalt are achieved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119236858A_ABST
    Figure CN119236858A_ABST
Patent Text Reader

Abstract

The invention relates to a reaction kettle, and belongs to the technical field of reaction kettles, the reaction kettle comprises a shell, a stirring shaft is arranged in the shell, stirring blades are arranged on the stirring shaft, and a stirring assembly used for rolling asphalt is further arranged between the stirring shaft and the shell. The reaction kettle has the effect of improving the mixing efficiency of the reaction kettle.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The invention relates to the field of reaction kettles, in particular to a reaction kettle. Background Art

[0002] In the process of coal tar processing, about 50% to 60% of asphalt is generally produced, which is a major product of tar processing. The larger the processing scale, the more asphalt is produced. Asphalt is a dark brown complex mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives, and is a kind of high-viscosity organic liquid.

[0003] During the production of asphalt, a reactor is needed to heat the asphalt for reaction. Due to the high viscosity of asphalt, the stirring motor encounters great resistance during operation, and only the asphalt in some areas flows with the operation of the stirring motor, making it difficult to fully stir the asphalt and the asphalt processing efficiency is insufficient. Summary of the invention

[0004] In order to improve the mixing effect of a reactor, the present invention provides a reactor.

[0005] A reaction kettle provided by the present invention adopts the following technical solution: A reaction kettle comprises a shell, wherein a stirring shaft is arranged inside the shell, stirring blades are arranged on the stirring shaft, and a stirring assembly for tumbling asphalt is also arranged between the stirring shaft and the shell.

[0006] By adopting the above technical solution, during the rotation of the stirring shaft, the stirring blades stir the asphalt inside the shell. At the same time, the stirring component flips the asphalt away from the stirring shaft area to the area near the stirring shaft, thereby allowing the asphalt inside the shell to flow and be fully stirred, thereby improving the stirring efficiency and stirring effect of the asphalt.

[0007] Optionally, the stirring assembly includes a rotating drum arranged inside the shell and coaxial with the stirring shaft, a connecting assembly is provided between the rotating drum and the stirring shaft, a plurality of evenly distributed through holes are opened on the rotating drum, a driving blade is provided on the side of the rotating drum away from the stirring shaft, and the stirring blade and the driving blade have opposite rotation directions.

[0008] By adopting the above technical solution, when the agitator shaft rotates, the asphalt near the agitator shaft is driven to move along the axial direction of the agitator shaft and diffuses to the surroundings at the bottom of the shell. The asphalt diffused from the bottom of the shell flows to the gap between the drum and the shell. At the same time, under the action of the connecting component, the drum and the agitator shaft rotate in the same direction, and the driving blades on the drum drive the asphalt between the drum and the shell to flow upward. At the same time, the asphalt between the shell and the drum passes through the through hole to reach between the drum and the agitator shaft again, thereby allowing the asphalt inside the shell to flow quickly, thereby achieving sufficient stirring of the asphalt.

[0009] Optionally, the connecting assembly includes a connecting cylinder coaxial with the rotating drum, the connecting cylinder abuts against the inner wall of the rotating drum, the connecting cylinder is provided with a slider slidingly connected to the rotating drum along the axis of the rotating drum, the connecting cylinder is provided with a connecting hole corresponding to the through hole, a connecting rod connecting the connecting cylinder and the stirring shaft is provided between the two, and a vibrating member is provided between the rotating drum and the stirring shaft.

[0010] By adopting the above technical solution, when the agitator shaft rotates, the agitator shaft drives the connecting cylinder to rotate through the connecting rod, and the connecting cylinder drives the rotating drum to rotate at the same time. During the rotation process, the vibrating member drives the rotating drum to vibrate, so that the rotating drum slides relative to the connecting cylinder through the slider. By vibrating the rotating drum, the asphalt around the rotating drum can be better stirred, thereby reducing the possibility of asphalt adhesion and blockage.

[0011] Optionally, the vibrating member includes a vibrating rod, one end of which is connected to the rotating drum, and the other end is provided with a vibrating block, a support rod coaxial with the rotating drum is slidably and rotatably connected to the vibrating block, the support rod is fixedly connected to the shell, an annular groove is provided on the vibrating block, a plurality of evenly distributed protrusions are provided on one side of the annular groove, and a plurality of evenly distributed protrusions are also provided on the other side, and the protrusions on both sides of the annular groove are staggered, and a driving block inserted in the annular groove and abutting against the protrusions is provided above the support rod.

[0012] By adopting the above technical solution, during the process of the rotating drum rotating with the stirring shaft, the vibration block is driven to rotate by the vibration rod, the vibration block rotates relative to the support rod, the driving block on the support rod slides in the annular groove, and during the rotation of the vibration block, the driving block squeezes the protrusion, so that the vibration block slides up and down along the support rod, thereby driving the rotating drum to vibrate up and down.

[0013] Optionally, a dredging piece is provided at one end of the vibration block facing the bottom of the shell, and the dredging piece includes a dredging rod arranged on the vibration block, a dredging ring is provided at the discharge port of the shell, a fixing rod is provided between the dredging ring and the discharge port, a plurality of evenly distributed levers are hinged on the dredging ring, the dredging rod is rotatably connected to the dredging ring, and a shifting block abutting against one of the shifting rods is provided on the dredging rod, and a spring is provided between the shifting rod and the dredging ring.

[0014] By adopting the above technical solution, when the vibration block rotates, the vibration block drives the dredging rod to rotate, and the dredging rod drives the shifting block to rotate in the dredging ring. The shifting block drives the shifting rod to rotate relative to the dredging ring through extrusion, so that the shifting rod can stir the asphalt in the discharge port, thereby improving the discharge efficiency of the discharge port and reducing the possibility of blockage.

[0015] Optionally, a jacket is provided on the outside of the shell, a coil is provided inside the jacket, and a plurality of water wheels are also provided inside the jacket, which are distributed along the rotation direction of the driving blades and rotatably connected to the outside of the shell. A rotating rod that penetrates into the shell is fixedly connected to the axis of the water wheel, and a dredging blade is provided at one end of the rotating rod located inside the shell, and the water wheel is located inside the coil.

[0016] By adopting the above technical solution, when the heating medium flows inside the coil, the heating medium drives the water wheel to rotate, and the water wheel drives the rotating rod to rotate. The rotating rod further drives the asphalt flow between the shell and the drum through the dredging blades, thereby improving the asphalt flow speed and stirring efficiency.

[0017] Optionally, the rotating cylinder is provided with an arc-shaped hole surrounding the outside of the through hole, and the connecting cylinder is slidably connected with a scraper, one end of the scraper passes through the arc-shaped hole and abuts against the inner wall of the through hole, the connecting cylinder is provided with the same arc-shaped hole surrounding the outside of the connecting hole, and the rotating cylinder is also slidably connected with a scraper passing through the arc-shaped hole and abutting against the inner wall of the connecting hole.

[0018] By adopting the above technical solution, the relative movement of the rotating cylinder and the connecting cylinder causes the scraper to move along the arc hole, thereby causing the scraper to scrape the inner wall of the through hole or the connecting hole, reducing the possibility of asphalt adhesion and clogging the through hole or the connecting hole, thereby improving the flow efficiency of the asphalt.

[0019] Optionally, the upper end of the rotating drum is arranged to be arc-shaped and bends downward toward the side where the stirring shaft is located.

[0020] By adopting the above technical solution, the upper end of the rotating drum is arranged in a downwardly inclined arc shape to provide guidance for the asphalt and provide protection for the connecting drum.

[0021] In summary, the present invention includes at least one of the following beneficial technical effects: The stirring assembly flips the asphalt away from the stirring shaft area to the area near the stirring shaft, thereby allowing the asphalt inside the shell to flow and be fully stirred, thereby improving the stirring efficiency and stirring effect of the asphalt; When the agitator shaft rotates, the agitator shaft drives the connecting cylinder to rotate through the connecting rod, and the connecting cylinder drives the rotating drum to rotate at the same time. During the rotation process, the vibrating member drives the rotating drum to vibrate, so that the rotating drum slides relative to the connecting cylinder through the slider. By vibrating the rotating drum, the asphalt around the rotating drum can be better stirred, reducing the possibility of asphalt adhesion and blockage; When the vibration block rotates, the vibration block drives the dredging rod to rotate, and the dredging rod drives the shifting block to rotate in the dredging ring. The shifting block drives the shifting rod to rotate relative to the dredging ring through extrusion, so that the shifting rod can stir the asphalt in the discharge port, thereby improving the discharge efficiency of the discharge port and reducing the possibility of blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the connecting component and the vibrating member in an embodiment of the present invention.

[0024] Figure 3 yes Figure 1 Enlarged schematic diagram of part A in the middle.

[0025] Figure 4 yes Figure 1 Enlarged schematic diagram of part B in the middle.

[0026] Explanation of the reference numerals: 1. Shell; 11. End cover; 12. Feed inlet; 13. Discharge outlet; 14. Protective cover; 2. Stirring shaft; 21. Stirring blade; 3. Stirring assembly; 31. Rotating drum; 311. Through hole; 312. Arc hole; 32. Driving blade; 4. Connecting assembly; 41. Connecting drum; 411. Connecting hole; 412. Scraper; 42. Sliding block; 43. Connecting rod; 44. Vibrating member; 441. Vibrating rod; 442. Vibrating block; 443. Support rod; 444. Ring groove; 445. Protrusion; 446. Driving block; 5. Clearing member; 51. Clearing rod; 52. Clearing ring; 53. Fixing rod; 54. Push rod; 55. Push block; 56. Spring; 6. Jacket; 61. Coil; 62. Waterwheel; 63. Rotating rod; 64. Clearing blade. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-Figure 4 The present invention is described in further detail.

[0028] The embodiment of the present invention discloses a reaction kettle. Figure 1 A reactor comprises a shell 1, an end cover 11 is closed on the shell 1, a feed port 12 is opened at the upper end of the shell 1, and a discharge port 13 is opened at the bottom of the shell 1.

[0029] A protective cover 14 is arranged above the end cover 11 of the shell 1, and a driving motor is installed in the protective cover 14. A stirring shaft 2 is rotatably connected to the center of the end cover 11. One end of the stirring shaft 2 is located in the protective cover 14, and the other end is located in the shell 1. A stirring blade 21 is fixed on the outer wall of one end of the stirring shaft 2 located in the shell 1, and the driving motor is connected to the stirring shaft 2 through a bevel gear. At the same time, a stirring component 3 is also provided between the stirring shaft 2 and the shell 1.

[0030] Asphalt enters the shell 1 through the feed port 12, and then the driving motor drives the stirring shaft 2 to rotate, and the stirring blades 21 stir the asphalt inside the shell 1. At the same time, the stirring component 3 flips the asphalt away from the stirring shaft 2 to the area near the stirring shaft 2, thereby allowing the asphalt inside the shell 1 to flow and be fully stirred.

[0031] The stirring assembly 3 includes a rotating drum 31 which is arranged inside the shell 1 and coaxial with the stirring shaft 2. A connecting assembly 4 is provided between the rotating drum 31 and the stirring shaft 2. A plurality of evenly distributed through holes 311 are opened on the rotating drum 31. A driving blade 32 is provided on the side of the rotating drum 31 away from the stirring shaft 2. The stirring blade 21 and the driving blade 32 have opposite rotation directions. The stirring blade 21 drives the asphalt to move toward the discharge port 13, and the driving blade 32 drives the asphalt to move in a direction away from the discharge port 13.

[0032] Reference Figure 1 and Figure 2 The connecting assembly 4 includes a connecting cylinder 41 coaxial with the rotating cylinder 31, the outer wall of the connecting cylinder 41 abuts against the inner wall of the rotating cylinder 31, a slider 42 is fixedly connected to the connecting cylinder 41, and the slider 42 is slidably connected to the inner wall of the rotating cylinder 31 along the axis of the rotating cylinder 31. A connecting hole 411 corresponding to the through hole 311 is opened on the connecting cylinder 41, and a plurality of connecting rods 43 distributed around the axis of the connecting cylinder 41 are provided between the connecting cylinder 41 and the stirring shaft 2 to connect the two. One end of the connecting rod 43 is fixed to the connecting cylinder 41, and the other end is fixed to the stirring shaft 2. A vibrating member 44 is provided between the rotating cylinder 31 and the stirring shaft 2.

[0033] When the stirring shaft 2 rotates, the asphalt near the stirring shaft 2 is driven to move along the axis direction of the stirring shaft 2 and diffuse to the surroundings at the bottom of the shell 1. The asphalt diffused from the bottom of the shell 1 flows to the gap between the drum 31 and the shell 1. The stirring shaft 2 drives the connecting cylinder 41 to rotate through the connecting rod 43, and the connecting cylinder 41 drives the drum 31 to rotate at the same time. The drum 31 and the stirring shaft 2 rotate in the same direction. The driving blades 32 on the drum 31 make the asphalt between the drum 31 and the shell 1 flow upward. At the same time, the asphalt between the shell 1 and the drum 31 reaches the drum 31 and the stirring shaft 2 again through the through hole 311 and the connecting hole 411, so that the asphalt inside the shell 1 can flow quickly and be fully stirred. When the stirring shaft 2 rotates, the vibrating member 44 drives the drum 31 to vibrate, so that the drum 31 slides relative to the connecting cylinder 41 through the slider 42, and the possibility of asphalt sticking is reduced by vibrating the drum 31.

[0034] Reference Figure 1 and Figure 3The rotating drum 31 is provided with an arc-shaped hole 312 surrounding the outside of the through hole 311, and a scraper 412 is slidably connected to the connecting drum 41. One end of the scraper 412 passes through the arc-shaped hole 312 and abuts against the inner wall of the through hole 311. The connecting drum 41 is provided with the same arc-shaped hole 312 surrounding the outside of the connecting hole 411, and the rotating drum 31 is also slidably connected with a scraper 412 passing through the arc-shaped hole 312 and abutting against the inner wall of the connecting hole 411.

[0035] The relative movement of the rotating cylinder 31 and the connecting cylinder 41 causes the scraper 412 to move along the arc hole 312, thereby causing the scraper 412 to scrape the inner wall of the through hole 311 or the connecting hole 411, reducing the possibility of asphalt adhering to and clogging the through hole 311 or the connecting hole 411, thereby improving the flow efficiency of the asphalt.

[0036] The vibrating member 44 includes a plurality of vibrating rods 441 evenly distributed around the axis of the rotating drum 31, one end of the vibrating rod 441 is fixedly connected to the rotating drum 31, and a vibrating block 442 is fixedly provided at the other end. The vibrating block 442 is plugged with a supporting rod 443, which passes through the stirring shaft 2 along the axis of the stirring shaft 2 and is fixedly connected to the protective cover 14. An annular groove 444 is provided on the vibrating block 442, and a plurality of evenly distributed protrusions 445 are arranged on one side of the annular groove 444, and a plurality of evenly distributed protrusions 445 are also arranged on the other side, and the protrusions 445 on both sides of the annular groove 444 are staggered, and a driving block 446 is fixed on the supporting rod 443, and the driving block 446 is plugged into the annular groove 444 and abuts against the protrusions 445 on both sides of the annular groove 444 at the same time.

[0037] When the drum 31 rotates along with the stirring shaft 2, the vibration block 442 is driven to rotate by the vibration rod 441. The vibration block 442 rotates relative to the support rod 443. The driving block 446 on the support rod 443 slides in the annular groove 444. During the rotation of the vibration block 442, the driving block 446 squeezes the protrusion 445, so that the vibration block 442 slides up and down along the support rod 443, thereby driving the drum 31 to vibrate up and down.

[0038] A dredging piece 5 is provided at one end of the vibration block 442 facing the bottom of the shell 1, and the dredging piece 5 includes a dredging rod 51 fixed on the vibration block 442, and the dredging rod 51 is coaxially arranged with the stirring shaft 2. A dredging ring 52 is sleeved on the end of the dredging rod 51 away from the vibration block 442, and a fixing rod 53 is fixedly connected to the circumferential side of the dredging ring 52, and the end of the fixing rod 53 away from the dredging ring 52 is fixed at the discharge port 13 of the shell 1, and a plurality of levers 54 evenly distributed around the dredging rod 51 are hinged on the dredging ring 52, and the dredging rod 51 is rotatably connected to the dredging ring 52, and a shifting block 55 is fixed on the dredging rod 51, and the shifting block 55 abuts against one of the shifting rods 54, and a spring 56 is fixedly connected to the side of the shifting rod 54 away from the dredging rod 51, and the spring 56 is also fixedly connected to the dredging ring 52.

[0039] When the vibration block 442 rotates, the vibration block 442 drives the dredging rod 51 to rotate, and the dredging rod 51 drives the shifting block 55 to rotate in the dredging ring 52. The shifting block 55 drives the shifting rod 54 to rotate relative to the dredging ring 52 by squeezing, so that the shifting rod 54 can stir the asphalt in the discharge port 13, thereby improving the discharge efficiency of the discharge port 13 and reducing the possibility of blockage. Reference Figure 1 and Figure 4 A jacket 6 is fixed on the outside of the shell 1, and a coil 61 is installed in the jacket 6. The jacket 6 is also provided with a plurality of water wheels 62 distributed along the rotation direction of the driving blade 32 and rotatably connected to the outside of the shell 1. A rotating rod 63 penetrating into the inside of the shell 1 is fixedly connected at the axis of the water wheel 62. A dredging blade 64 is provided at one end of the rotating rod 63 located in the shell 1, and one side of the water wheel 62 is located in the coil 61.

[0040] When the heating medium flows inside the coil 61, the heating medium drives the waterwheel 62 to rotate, and the waterwheel 62 drives the rotating rod 63 to rotate. The rotating rod 63 further drives the asphalt flow between the shell 1 and the drum 31 through the dredging blades 64, thereby improving the asphalt flow speed and stirring efficiency.

[0041] The upper end of the rotating drum 31 can also be set to an arc shape and bend downward toward the side where the stirring shaft 2 is located. This is not shown in this embodiment. The upper end of the rotating drum 31 is set to a downwardly inclined arc shape to provide guidance for the asphalt and provide protection for the connecting cylinder 41.

[0042] The implementation principle of a reactor in an embodiment of the present invention is as follows: after the asphalt enters the shell 1 through the feed port 12, the driving motor drives the stirring shaft 2 to rotate, and the stirring shaft 2 cooperates with the rotating drum 31 to drive the asphalt to circulate inside the shell 1, thereby quickly stirring the asphalt. After the stirring is completed, the discharge port 13 of the shell 1 is opened, and the stirring shaft 2 drives the asphalt to flow out of the discharge port 13. The lever 54 moves the asphalt at the discharge port 13 to accelerate the discharge of the asphalt, thereby improving the asphalt production efficiency.

[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction kettle, characterized in that: The invention comprises a shell (1), wherein a stirring shaft (2) is arranged inside the shell (1), and a stirring blade (21) is arranged on the stirring shaft (2), and a stirring assembly (3) for rolling asphalt is also arranged between the stirring shaft (2) and the shell (1), and the stirring assembly (3) comprises a rotating drum (31) arranged inside the shell (1) and coaxial with the stirring shaft (2), a connecting assembly (4) is arranged between the rotating drum (31) and the stirring shaft (2), a plurality of evenly distributed through holes (311) are opened on the rotating drum (31), and a driving blade (32) is arranged on a side of the rotating drum (31) away from the stirring shaft (2), and the The stirring blade (21) and the driving blade (32) have opposite rotation directions. The connecting assembly (4) comprises a connecting cylinder (41) coaxial with the rotating cylinder (31), the connecting cylinder (41) abutting against the inner wall of the rotating cylinder (31), the connecting cylinder (41) being provided with a sliding block (42) slidably connected to the rotating cylinder (31) along the axis of the rotating cylinder (31), the connecting cylinder (41) being provided with a connecting hole (411) corresponding to the through hole (311), a connecting rod (43) connecting the connecting cylinder (41) and the stirring shaft (2), and a vibrating member (44) being provided between the rotating cylinder (31) and the stirring shaft (2).

2. A reaction kettle according to claim 1, characterized in that: The vibrating member (44) comprises a vibrating rod (441), one end of the vibrating rod (441) being connected to the rotating drum (31), and the other end being provided with a vibrating block (442), a supporting rod (443) coaxial with the rotating drum (31) being slidably and rotatably connected to the vibrating block (442), the supporting rod (443) being fixedly connected to the housing (1), an annular groove (444) being provided on one side of the annular groove (444) with a plurality of evenly distributed protrusions (445), and a plurality of evenly distributed protrusions (445) being provided on the other side, and the protrusions (445) on both sides of the annular groove (444) being staggered, and a driving block (446) being inserted into the annular groove (444) and abutting against the protrusions (445) being provided above the supporting rod (443).

3. A reaction kettle according to claim 2, characterized in that: A dredging member (5) is provided at one end of the vibration block (442) facing the bottom of the shell (1), and the dredging member (5) comprises a dredging rod (51) arranged on the vibration block (442); a dredging ring (52) is provided at the discharge port (13) of the shell (1); a fixing rod (53) is provided between the dredging ring (52) and the discharge port (13); a plurality of evenly distributed levers (54) are hingedly connected to the dredging ring (52); the dredging rod (51) is rotatably connected to the dredging ring (52); a shifting block (55) abutting against one of the levers (54) is provided on the dredging rod (51); and a spring (56) is provided between the lever (54) and the dredging ring (52).

4. A reaction kettle according to claim 1, characterized in that: A jacket (6) is provided on the outside of the shell (1), a coil (61) is provided in the jacket (6), and a plurality of water wheels (62) are also provided in the jacket (6) and are distributed along the rotation direction of the driving blades (32) and are rotatably connected to the outside of the shell (1). A rotating rod (63) that penetrates the shell (1) is fixedly connected to the axis of the water wheel (62), and a dredging blade (64) is provided at one end of the rotating rod (63) located in the shell (1). The water wheel (62) is located in the coil (61).

5. A reaction kettle according to claim 1, characterized in that: The rotating cylinder (31) is provided with an arc-shaped hole (312) surrounding the outside of the through hole (311); the connecting cylinder (41) is slidably connected with a scraper (412); one end of the scraper (412) passes through the arc-shaped hole (312) and abuts against the inner wall of the through hole (311); the connecting cylinder (41) is provided with an arc-shaped hole (312) surrounding the outside of the connecting hole (411); and the rotating cylinder (31) is also slidably connected with a scraper (412) passing through the arc-shaped hole (312) and abutting against the inner wall of the connecting hole (411).

6. A reaction kettle according to claim 1, characterized in that: The upper end of the rotating drum (31) is arranged in an arc shape and is bent downwards towards the side where the stirring shaft (2) is located.

Citation Information

Patent Citations

  • Stirring mechanism of reaction kettle

    CN110627208A

  • Ammonia-acid process organic and inorganic compound fertilizer humic acid activation treatment reactor

    CN204490758U

  • Concrete mixer

    CN206551220U

  • Energy-saving cement reaction kettle for cement plant

    CN211246527U

  • Low-energy-consumption urea reaction device

    CN217594600U