Production method of high-density and high-strength pot furnace calcined petroleum coke

Abstract

The invention discloses a production method of high-density high-strength pot furnace calcined petroleum coke, which comprises the following steps: crushing low-sulfur petroleum coke and medium-temperature pitch raw materials into granules with the particle size of less than 1mm, stirring and mixing according to the mass ratio of (80-95): (20-5), then adding organic binder slurry with the mass ratio of 5-15%, and uniformly mixing; adding the uniformly stirred mixture into a ball press machine, and carrying out cold-state die-casting molding to obtain a molded granular raw material; mixing the granular raw material with 10-25% by weight of low-sulfur calcined coke, putting the mixture into a pot-type furnace, and calcining to obtain granular clinker; and screening the granular clinker to obtain an oversize product, namely a calcined petroleum coke product, and an undersize product as a coke return raw material. The method provided by the invention can reduce the use of asphalt raw materials and improve the efficiency and quality of calcined petroleum coke.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum coke production, and in particular to a production method of high-density and high-strength pot-type furnace calcined petroleum coke. Background Art

[0002] In the existing high-density coke production process, a high proportion of medium-temperature asphalt needs to be added during the production process, and the coke oven is used for production. The products produced by hot forming are irregular in shape and need to be processed and crushed for secondary processing. The irregular shape of the petroleum coke products produced by this type of process will have a certain impact on the actual use effect, and a large number of harmful gases and harmful chemicals are generated during the production process. Based on environmental protection requirements, high-strength petroleum coke produced by coke ovens can no longer meet the process requirements. It is particularly important to develop a new production process to meet the requirements of high-density calcined petroleum coke. Summary of the invention

[0003] Technical problems to be solved: In view of the technical problems existing in the background technology, the present invention provides a production method for calcining petroleum coke in a high-density and high-strength tank furnace, which shortens the process flow and improves the efficiency and quality of calcining petroleum coke.

[0004] Technical solution: The production method of high-density and high-strength pot-type furnace calcined petroleum coke of the present invention comprises the following steps: Step 1: crush the low-sulfur petroleum coke and medium-temperature asphalt raw materials into particles less than 1 mm, stir and mix them in a double-shaft cage stirring device according to a mass ratio of (80-95): (20-5), and then add an organic binder slurry with a mass ratio of 5%-15% and mix them evenly; Step 2: Add the evenly stirred mixture into a pelletizing machine for cold die casting to obtain a pelletized raw material; Step 3: Mix the pellet raw meal with 10-25% by weight of low-sulfur coke and put it into a pot furnace for calcination to obtain pellet clinker; Step 4: Add the granular clinker to a screening device with a preset aperture screen for screening. The material on the screen is the calcined petroleum coke product, and the material under the screen is used as return coke to step 1.

[0005] Preferably, in step 3, the material is discharged after calcining at a calcination temperature of 1150-1250° C. for 48 hours, and the volatile matter is maintained below 10% during the calcination process.

[0006] Preferably, the organic binder slurry in step 1 is polyvinyl alcohol slurry.

[0007] Preferably, the preparation device of the polyvinyl alcohol slurry includes a mixing reaction tank and a powder feeding device; the mixing reaction tank includes a tank body and a closed end cover thereon, and the closed end cover is provided with a stirring device and a heating device extending into the tank body; the powder feeding device is correspondingly connected to one side of the closed end cover and replenishes polyvinyl alcohol powder into the mixing reaction tank.

[0008] Preferably, a driving mechanism is provided at the top end of the closed end cover in cooperation with the stirring device.

[0009] Preferably, the stirring device comprises a first support plate and a second support plate which are arranged correspondingly up and down, and a first stirrer and a second stirrer which rotate asynchronously are arranged between the first support plate and the second support plate; The first agitator and the second agitator both include a stirring shaft and a stirring assembly mounted on the stirring shaft, the stirring assembly includes a stirring frame with a square structure, the stirring frame is provided with trapezoidal guide frames along both vertical sides, a plurality of guide plates are provided in the guide frame along its height direction, and the guide plates are arranged to be inclined up and down.

[0010] Preferably, the driving mechanism comprises a driving motor and a transmission assembly; The transmission assembly includes a driving shaft correspondingly arranged on the first support plate and a driving wheel sleeved on the driving shaft, and the upper side of the first support plate is respectively provided with a driving wheel corresponding to the stirring shaft, and the driving wheel is meshed and connected with the driving wheel; The driving motor is connected to the driving shaft through a coupling; A support connection end is arranged at the center of the bottom end of the second support plate, and the support connection end is supported at the center of the bottom of the tank body.

[0011] Preferably, a thermometer extending into the mixing reaction tank is provided at the top end of the closed end cover.

[0012] Preferably, a discharge end is provided on one side of the bottom of the tank body.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The calcined petroleum coke product of the present invention is first cold-formed before calcination, and no secondary processing and crushing is required after the calcination is completed. The final calcined petroleum coke product has a regular shape, and various indicators are not lower than those of traditional high-density calcined petroleum coke; the proportion of asphalt used in the calcined petroleum coke material is reduced, which significantly reduces pollutants generated in the production process; 2. The use of polyvinyl alcohol as the binder can improve the structural strength and molding speed of cold molding; the binder slurry preparation device can improve the preparation efficiency and quality of the binder slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic flow diagram of a production method of calcining petroleum coke in a pot furnace according to the present invention; Figure 2 This is a front view of the structure of the adhesive preparation device of the present invention; Figure 3 for Figure 2 Main view of the internal structure of the middle reaction tank; Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of the stirring device.

[0015] Figure numerals: 1. mixing reaction tank; 11. tank body; 12. closed end cover; 13. liquid inlet end; 14. feed end; 15. thermometer; 16. discharge end; 17. stirring device; 171. first support plate; 172. second support plate; 173. first agitator; 174. stirring assembly; 1741. stirring frame; 1742. guide frame; 1743. guide plate; 175. stirring shaft; 176. second agitator; 177. supporting connection end; 18. driving mechanism; 181. driving motor; 182. coupling; 183. transmission assembly; 1831. driving shaft; 1832. driving wheel; 1833. transmission wheel; 2. powder feeding device. DETAILED DESCRIPTION

[0016] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 4 The technical solutions of the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0017] Example 1: Figure 1 As shown, the present invention discloses a production method of high-density and high-strength pot-type furnace calcined petroleum coke, the production method comprising the following steps: (1) Crush the low-sulfur petroleum coke and medium-temperature asphalt raw materials into particles less than 1 mm, stir and mix them in a double-axis cage stirring device at a mass ratio of 80:20, and then add and mix organic binder slurry with a mass ratio of 15%, wherein the organic binder slurry is polyvinyl alcohol slurry. The traditional mixing method uses a mixing pot, which is not only inefficient, but also requires the material to be discharged after mixing before the next pot of mixing can be carried out. In the mixing process, there will be uneven mixing. In order to ensure stable and continuous production, the present invention uses a double-axis cage stirring device to mix the petroleum coke raw materials, which can not only continuously mix, but also replenish the binder slurry at any time according to the external conditions of the material during the processing, which is convenient and quick.

[0018] (ii) Add the evenly stirred mixture into a briquette machine for cold die casting to obtain formed raw granules. The pressure and size of the briquette machine can be freely adjusted according to demand, providing stable pressure. The strength of the material after cold die casting is good. It can keep its shape intact after falling at least 3 times from a height of 1.5 meters. The excess slag can be recycled for die casting again, reducing material waste.

[0019] (III) Mix the granular raw material with 10% by weight of low-sulfur coke and put it into a pot furnace for calcination. After calcination at a calcination temperature of 1150°C for 48 hours, discharge the material, maintain the volatile matter below 10% during the calcination process, and obtain granular clinker. The present invention uses a pot furnace to produce calcined petroleum coke. Through precise process adjustment, the pot furnace is used to produce by utilizing the volatility of the raw materials. No additional heat source is required, and it is highly efficient and energy-saving. The calcination production process is continuous and stable, and the emissions meet environmental protection requirements.

[0020] (iv) adding the granular clinker to a screening device with a preset aperture screen for screening, the material on the screen is the calcined petroleum coke product, and the material under the screen is used as the return coke raw material.

[0021] Example 2: Figure 1 As shown, the present invention discloses a production method of high-density and high-strength pot-type furnace calcined petroleum coke, the production method comprising the following steps: (1) Crush the low-sulfur petroleum coke and medium-temperature asphalt raw materials into particles less than 1 mm, stir and mix them in a double-axis cage stirring device at a mass ratio of 95:5, and then add and mix organic binder slurry with a mass ratio of 5%, wherein the organic binder slurry is polyvinyl alcohol slurry. The traditional mixing method uses a mixing pot, and the mixing method of the mixing pot is not only inefficient, but also requires the material to be discharged after the mixing is completed before the next pot of mixing can be carried out. In the mixing process, there will be uneven mixing. In order to ensure stable and continuous production, the present invention uses a double-axis cage stirring device to mix the petroleum coke raw materials, which can not only continuously mix, but also replenish the binder slurry at any time according to the external conditions of the material during the processing, which is convenient and quick.

[0022] (ii) Add the evenly stirred mixture into a briquette machine for cold die casting to obtain formed raw granules. The pressure and size of the briquette machine can be freely adjusted according to demand, providing stable pressure. The strength of the material after cold die casting is good. It can keep its shape intact after falling at least 3 times from a height of 1.5 meters. The excess slag can be recycled for die casting again, reducing material waste.

[0023] (III) Mix the granular raw material with 25% by weight of low-sulfur coke and put it into a pot furnace for calcination. After calcination at a calcination temperature of 1250°C for 48 hours, discharge the material, maintain the volatile matter below 10% during the calcination process, and obtain granular clinker. The present invention adopts a pot furnace to produce calcined petroleum coke. Through precise process adjustment, the pot furnace is used to utilize the volatility of the raw materials for production. No additional heat source is required, and it is highly efficient and energy-saving. The calcination production process is continuous and stable, and the emissions meet environmental protection requirements.

[0024] (iv) adding the granular clinker to a screening device with a preset aperture screen for screening, the material on the screen is the calcined petroleum coke product, and the material under the screen is used as the return coke raw material.

[0025] Example 3: Figure 1 As shown, the present invention discloses a production method of high-density and high-strength pot-type furnace calcined petroleum coke, the production method comprising the following steps: (1) Crush the low-sulfur petroleum coke and medium-temperature asphalt raw materials into particles less than 1 mm, stir and mix them in a double-axis cage stirring device at a mass ratio of 90:10, and then add and mix organic binder slurry with a mass ratio of 10%, wherein the organic binder slurry is polyvinyl alcohol slurry. The traditional mixing method uses a mixing pot, and the mixing method of the mixing pot is not only inefficient, but also requires the material to be discharged after the mixing is completed before the next pot of mixing can be carried out. In the mixing process, there will be uneven mixing. In order to ensure stable and continuous production, the present invention uses a double-axis cage stirring device to mix the petroleum coke raw materials, which can not only continuously mix, but also replenish the binder slurry at any time according to the external conditions of the material during the processing, which is convenient and quick.

[0026] (ii) Add the evenly stirred mixture into a briquette machine for cold die casting to obtain formed raw granules. The pressure and size of the briquette machine can be freely adjusted according to demand, providing stable pressure. The strength of the material after cold die casting is good. It can keep its shape intact after falling at least 3 times from a height of 1.5 meters. The excess slag can be recycled for die casting again, reducing material waste.

[0027] (III) Mix the granular raw material with 18% by weight of low-sulfur coke and put it into a pot furnace for calcination. After calcination at a calcination temperature of 1200°C for 48 hours, discharge the material, maintain the volatile matter below 10% during the calcination process, and obtain granular clinker. The present invention uses a pot furnace to produce calcined petroleum coke. Through precise process adjustment, the pot furnace is used to utilize the volatility of the raw materials for production. No additional heat source is required, and it is highly efficient and energy-saving. The calcination production process is continuous and stable, and the emissions meet environmental protection requirements.

[0028] (iv) adding the granular clinker to a screening device with a preset aperture screen for screening, the material on the screen is the calcined petroleum coke product, and the material under the screen is used as the return coke raw material.

[0029] The calcined petroleum coke products produced in Examples 1 to 3 of the present invention only need to be simply screened, without the need for secondary crushing; the overall quality of the calcined petroleum coke products is high, with a mechanical strength greater than 80%, a wear resistance less than 10%, and a density greater than 1.35 kg / m 3 The porosity is between 30% and 35%, and its quality is higher than the high-density calcined petroleum coke produced by conventional processes.

[0030] Example 4: Figure 2~3 As shown, the preparation device of polyvinyl alcohol slurry includes a mixing reaction tank 1 and a powder feeding device 2. The mixing reaction tank 1 includes a tank body 11 and a closed end cover 12 thereon. The closed end cover 12 is provided with a stirring device 17 and a heating device extending into the tank body 11. The heating device can use existing technologies such as a heating rod to realize its heating function. A thermometer 15 extending into the mixing reaction tank 1 is provided at the top of the closed end cover 12. The thermometer 15 can realize the detection of the heating temperature of water. The closed end cover 12 is also provided with a liquid inlet 13 for adding water and a feeding end 14 for adding materials. The powder feeding device 2 is connected to the feeding end of the closed end cover 12, and polyvinyl alcohol powder can be added to the mixing reaction tank 1. The powder feeding device 2 can realize the automatic feeding function according to demand; a discharge end 16 is provided at one side of the bottom of the tank body 11, and the prepared polyvinyl alcohol slurry can be discharged.

[0031] like Figure 3~4 As shown, the top of the closed end cover 12 is provided with a driving mechanism 18 in cooperation with the stirring device 17. The stirring device 17 includes a first support plate 171 and a second support plate 172 correspondingly arranged above and below, the first support plate 171 is correspondingly connected to the closed end cover 12, and a support connection end 177 is arranged at the center of the bottom end of the second support plate 172, and the support connection end 177 is supported at the center of the bottom of the mixing reaction tank. An asynchronously rotating first stirrer 173 and a second stirrer 176 are arranged between the first support plate 171 and the second support plate 172, and the angle between the first stirrer 173 and the second stirrer 176 is preferably set to an angle of 90°. The use of the asynchronously arranged first stirrer 173 and the second stirrer 176 can improve the stirring efficiency of the slurry.

[0032] The first agitator 173 and the second agitator 176 each include a stirring shaft 175 and a stirring assembly 174 mounted on the stirring shaft 175. The stirring assembly 174 includes a stirring frame 1741 with a square structure. The stirring frame 1741 is provided with trapezoidal flow guide frames 1742 along both vertical sides. The flow guide frame 1742 is provided with a plurality of flow guide plates 1743 along its height direction. The flow guide plates 1743 are arranged to be inclined up and down. The stirring assembly 174 with this arrangement can achieve efficient stirring of the slurry by itself. The stirring and reaction efficiency of the slurry can be further improved by the cooperation of the two groups.

[0033] The driving mechanism 18 includes a driving motor 181 and a transmission assembly 183. The transmission assembly 183 includes a driving shaft 1831 correspondingly arranged on the first support plate 171 and a driving wheel 1832 sleeved on the driving shaft 1831. The upper side of the first support plate 171 is respectively provided with a driving wheel 1833 corresponding to the stirring shaft 175. The driving wheel 1833 is meshed and connected with the driving wheel 1832. The driving motor 181 is connected with the driving shaft 1831 through a coupling 182. When working, the driving motor 181 drives the driving shaft 1831 to rotate through the coupling 182. During the rotation of the driving shaft 1831, the driving wheel 1832 drives the driving wheels 1833 on both sides to rotate. The driving mechanism 18 with this configuration can ensure that the first agitator 173 and the second agitator 176 will not interfere with each other during the rotation and stirring process, and maintain efficient stirring of the slurry in the tank body 11.

[0034] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A production method of calcining petroleum coke in a high-density and high-strength pot furnace, characterized in that: The production method comprises the following steps: Step 1: crush the low-sulfur petroleum coke and medium-temperature asphalt raw materials into particles less than 1 mm, stir and mix them in a double-shaft cage stirring device according to a mass ratio of (80-95): (20-5), and then add an organic binder slurry with a mass ratio of 5%-15% and mix them evenly; Step 2: Add the evenly stirred mixture into a pelletizing machine for cold die casting to obtain a pelletized raw material; Step 3: Mix the pellet raw meal with 10-25% by weight of low-sulfur coke and put it into a pot furnace for calcination to obtain pellet clinker; Step 4: Add the granular clinker to a screening device with a preset aperture screen for screening. The material on the screen is the calcined petroleum coke product, and the material under the screen is used as return coke to step 1.

2. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 1, characterized in that: In step 3, the material is discharged after calcining at a calcination temperature of 1150-1250° C. for 48 hours, and the volatile matter is maintained below 10% during the calcination process.

3. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 1, characterized in that: In step 1, the organic binder slurry is polyvinyl alcohol slurry.

4. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 3, characterized in that: The polyvinyl alcohol slurry preparation device comprises a mixing reaction tank (1) and a powder feeding device (2); the mixing reaction tank (1) comprises a tank body (11) and a closed end cover (12) thereon, the closed end cover (12) being provided with a stirring device (17) and a heating device extending into the tank body (11); the powder feeding device (2) is correspondingly connected to one side of the closed end cover (12) and replenishes polyvinyl alcohol powder into the mixing reaction tank (1).

5. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 4, characterized in that: A driving mechanism (18) is provided at the top end of the closed end cover (12) in cooperation with the stirring device (17).

6. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 5, characterized in that: The stirring device (17) comprises a first support plate (171) and a second support plate (172) which are arranged correspondingly above and below, and a first stirrer (173) and a second stirrer (176) which rotate asynchronously are arranged between the first support plate (171) and the second support plate (172); The first agitator (173) and the second agitator (176) both comprise a stirring shaft (175) and a stirring assembly (174) sleeved on the stirring shaft (175); the stirring assembly (174) comprises a stirring frame (1741) of a square structure; the stirring frame (1741) is provided with trapezoidal flow guide frames (1742) along two vertical sides respectively; a plurality of flow guide plates (1743) are provided inside the flow guide frame (1742) along its height direction, and the flow guide plates (1743) are arranged to be inclined up and down.

7. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 6, characterized in that: The driving mechanism (18) comprises a driving motor (181) and a transmission assembly (183); The transmission assembly (183) comprises a driving shaft (1831) correspondingly arranged on the first support plate (171) and a driving wheel (1832) sleeved on the driving shaft (1831); the upper side of the first support plate (171) is provided with a driving wheel (1833) correspondingly to the stirring shaft (175); the driving wheel (1833) is meshedly connected to the driving wheel (1832) for transmission; The driving motor (181) is drivingly connected to the driving shaft (1831) via a coupling (182); A support connection end (177) is provided at the centre of the bottom end of the second support plate (172), and the support connection end (177) is supported at the centre of the bottom of the tank body (11).

8. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 4, characterized in that: A thermometer (15) extending into the mixing reaction tank (1) is provided at the top end of the closed end cover (12).

9. The production method of high-density and high-strength pot furnace calcined petroleum coke according to claim 4, characterized in that: A discharge end (16) is provided at one side of the bottom of the tank body (11).

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