Coal slurry preparation device
By using a steam pipeline to provide steam purge on the drum screen, the problem of reduced coal slurry concentration caused by flushing water was solved, and the energy consumption of water-coal slurry gasification in the methanol synthesis process was reduced.
Patent Information
- Application Number
- CN202422092650.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In the prior art, flushing the screen of the drum screen with flushing water results in a decrease in the coal slurry concentration, which increases the energy consumption of the water-coal slurry gasification in the methanol synthesis process.
The steam pipeline is used to provide steam to blow and clear the screen of the drum screen, so as to avoid the introduction of additional moisture into the coal slurry, maintain the concentration of the coal slurry and reduce energy consumption.
The drum screen is dredged by steam blowing to prevent the coal slurry concentration from decreasing, thereby reducing the energy consumption of water-coal slurry gasification in the methanol synthesis process.
Smart Images
Figure CN223337230U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of methanol production, and in particular to a coal slurry preparation device. Background Art
[0002] Methanol, a colorless, transparent, flammable, and toxic liquid known as "industrial alcohol," occupies a crucial position in modern chemical industry. Based on raw material sources and technological processes, methanol production is concentrated in three categories: coal-to-methanol, coke oven gas-to-methanol, and natural gas-to-methanol. Coal-to-methanol involves crushing the raw coal into a slurry, then gasifying it and reacting it at high temperatures to produce methanol. Crushing the raw coal into a slurry is a critical step in the methanol synthesis process.
[0003] During production, raw coal is added with water and crushed into fine particles in a rod mill, forming a coal slurry in the process. The ground coal slurry is then filtered through a drum screen to remove large coal particles to ensure that the coal slurry can be completely reacted and converted in the reactor. To ensure the screening effect of the drum screen and prevent screen clogging, the screen needs to be flushed promptly. The traditional method is to set flushing water above the screen to backwash the screen. However, this method introduces a large amount of water into the coal slurry, resulting in a decrease in the concentration of the coal slurry, affecting the coal slurry gasification reaction process, and increasing the energy consumed by the water-coal slurry gasification process during the methanol synthesis process. Utility Model Content
[0004] The present application provides a coal slurry preparation device to solve the problem that the existing method of using flushing water to flush the screen of the drum screen causes the coal slurry concentration to decrease, and thus increases the energy consumed by the gasification of the water-coal slurry during the synthesis of methanol.
[0005] The present application provides a coal slurry preparation device, comprising a drum screen and a rod mill connected to the drum screen, wherein the drum screen is also connected to a discharge trough and a steam pipeline respectively;
[0006] The discharge trough is also connected to a cleaning water pipeline, and the discharge trough is also connected to the coal slurry gasification device and the rod mill through a discharge pump.
[0007] Optionally, the drum screen is further connected to a coarse material collecting box, and the coarse material collecting box is further connected to a material input end of the rod mill.
[0008] Optionally, the drum screen includes a cylindrical screen and a frame for mounting the cylindrical screen, a receiving hopper is provided below the cylindrical screen, the receiving hopper is connected to the frame through a plurality of support rods, and an output end of the receiving hopper is connected to a discharge chute;
[0009] Steam injection devices are respectively provided on both sides of the cylindrical screen, and the steam injection devices are connected to the steam pipeline;
[0010] A driving device matching the cylindrical screen is arranged on the frame.
[0011] Optionally, an air collecting hood is provided on the upper cover of the cylindrical screen;
[0012] The gas collecting hood is also connected to the steam extraction pump.
[0013] Optionally, the steam injection device includes a steam header, one side of which is connected to a plurality of steam nozzles, and the other side of which is connected to a steam pipeline through a plurality of steam supply pipes.
[0014] Optionally, the discharge trough is further connected to a sewage treatment device via a pipeline;
[0015] A filter is also provided between the discharge trough and the sewage treatment device;
[0016] The filter is also connected to the coarse material collection box.
[0017] Optionally, a cleaning pipe is provided in the upper portion of the discharge chute;
[0018] The cleaning pipe is arranged along the inner wall of the discharge trough in the circumferential direction, and a plurality of water distribution holes are opened on the side of the cleaning pipe close to the inner wall of the discharge trough;
[0019] The cleaning pipe is connected to the cleaning water line through a pipeline.
[0020] The present application provides a coal slurry preparation device, which sets a steam pipeline and uses the steam supplied by the steam pipeline to blow and clear the drum screen. While clearing the screen of the drum screen, it can prevent the introduction of additional moisture into the coal slurry, thereby overcoming the disadvantages of the existing method of using flushing water to flush the screen of the drum screen, which leads to a decrease in the coal slurry concentration and an increase in the energy consumed by the gasification of the water-coal slurry in the methanol synthesis process. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0022] Figure 1 A schematic diagram of a coal slurry preparation device provided in one embodiment of the present application;
[0023] Figure 2 A schematic diagram of the three-dimensional structure of a drum screen provided in one embodiment of the present application;
[0024] Figure 3 A schematic diagram of a coal slurry preparation device provided in another embodiment of the present application;
[0025] Figure 4A schematic diagram of the three-dimensional structure of a drum screen provided in another embodiment of the present application;
[0026] Figure 5 A schematic diagram of the three-dimensional structure of a steam injection device provided in one embodiment of the present application;
[0027] Figure 6 A schematic diagram of a coal slurry preparation device provided in yet another embodiment of the present application;
[0028] Figure 7 A schematic diagram of the structure of a discharge chute provided in one embodiment of the present application;
[0029] Figure 8 A schematic diagram of the three-dimensional structure of a steam injection device provided in one embodiment of the present application.
[0030] Description of reference numerals:
[0031] 1. Drum screen; 2. Rod mill; 3. Discharge chute; 4. Steam pipeline; 5. Washing water pipeline; 6. Coal slurry gasification device; 7. Coarse material collection box; 8. Sewage treatment device; 9. Filter; 11. Cylindrical screen; 12. Frame; 13. Hopper; 14. Steam injection device; 15. Drive device; 16. Gas collection hood; 17. Steam extraction pump; 31. Discharge pump; 32. Washing pipe; 131. Support rod; 141. Steam header; 142. Steam nozzle; 143. Steam supply pipe. DETAILED DESCRIPTION
[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.
[0033] like Figure 1 As shown, the present application provides a coal slurry preparation device, comprising a drum screen 1 and a rod mill 2 connected to the drum screen 1, wherein the drum screen 1 is further connected to a discharge trough 3 and a steam pipeline 4 respectively;
[0034] The discharge trough 3 is also connected to the cleaning water pipeline 5, and the discharge trough 3 is also connected to the coal slurry gasification device 6 and the rod mill 2 through the discharge pump 31.
[0035] During use, raw coal is fed into the rod mill 2 from the material input end of the rod mill 2, and an appropriate amount of water is added at the same time. The rod mill 2 is used to crush the raw coal lumps to form coal slurry. The material output end of the rod mill 2 feeds the ground coal slurry into the drum screen 1 for screening. Coal slurry with qualified particle size is screened off and then fed into the discharge chute 3. Coal lumps that fail to pass through the screen are output from the other end of the drum screen 1 and fall into the corresponding collection equipment, and then returned to the rod mill 2 for further crushing. When the drum screen 1 is screening the coal slurry, the concentration of the coal slurry is relatively high, which will cause the coal slurry to adhere to the screen of the drum screen 1, resulting in a smaller mesh size and affecting the screening effect of the coal slurry. At this time, the steam (pressure of 0.5-0.8 MPa) provided by the steam pipeline 4 is used to blow the screen to blow off the coal slurry adhering to the screen and clear the screen.
[0036] The screened coal slurry that falls into the discharge trough 3 is stirred by the stirring device in the discharge trough 3 to prevent the coal slurry from settling. The coal slurry is then pumped into the coal slurry gasification device 6 through the discharge pump 31 for reaction. If the coal slurry concentration in the discharge trough 3 does not meet the standard, the discharge pump 31 transfers the unqualified coal slurry to the rod mill 2 for re-grinding and slurry adjustment.
[0037] When the discharge trough 3 is cleaned regularly, the coal slurry adhering to the inner wall of the discharge trough 3 is washed away with clean water supplied by the cleaning water pipeline 5, and the wastewater containing coal slurry generated by cleaning the discharge trough 3 is discharged from the bottom of the discharge trough 3 for treatment.
[0038] The present application provides a coal slurry preparation device, which is equipped with a steam pipeline 4 and uses the steam supplied by the steam pipeline 4 to blow and clear the drum screen 1. While clearing the screen of the drum screen 1, it can prevent the introduction of additional moisture into the coal slurry, thereby overcoming the disadvantage of using flushing water to flush the screen of the drum screen, which leads to a decrease in the coal slurry concentration and an increase in the energy consumed by the gasification of the water-coal slurry in the methanol synthesis process.
[0039] like Figure 1 As shown, optionally, the drum screen 1 is further connected to a coarse material collecting box 7 , and the coarse material collecting box 7 is further connected to a material input end of the rod mill 2 .
[0040] In the present application, the coal slurry is screened by the cylindrical screen 11, and the coal blocks that fail to pass through the screen are output from the other end of the cylindrical screen 11 and fall into the coarse material collection box 7, and then return to the rod mill 2 to be crushed again.
[0041] like Figure 2 As shown, optionally, the drum screen 1 includes a cylindrical screen 11 and a frame 12 for mounting the cylindrical screen 11, a receiving hopper 13 is provided below the cylindrical screen 11, the receiving hopper 13 is connected to the frame 12 through a plurality of support rods 131, and the output end of the receiving hopper 13 is connected to the discharge chute 3;
[0042] Steam injection devices 14 are provided on both sides of the cylindrical screen 11, and the steam injection devices 14 are connected to the steam pipeline 4;
[0043] A driving device 15 matching the cylindrical screen 11 is provided on the frame 12 .
[0044] The material output end of the rod mill 2 inputs the ground coal slurry into the drum screen 1, and the driving device 15 on the frame 12 (such as a pulley, gear, etc. driven by a motor) drives the cylindrical screen 11 to screen the coal slurry. The coal slurry with qualified particle size is screened off and falls into the receiving hopper 13, and then input into the discharge trough 3. When the cylindrical screen 11 is screening the coal slurry, the concentration of the coal slurry is relatively high, which will cause the coal slurry to adhere to the cylindrical screen 11, resulting in a smaller mesh size and affecting the screening effect of the coal slurry. At this time, the steam supplied by the steam pipeline 4 can be passed into the steam injection device 14 to blow and clear the cylindrical screen 11. Because the speed of the cylindrical screen 11 of the drum screen 1 is controllable and the coal slurry has a certain viscosity, it is possible to avoid the coal slurry adhering to the cylindrical screen 11 from being thrown into the steam injection device 14, and the height of the steam injection device 14 can also be adjusted according to actual conditions.
[0045] like Figure 3 and Figure 4 As shown, optionally, an air collecting cover 16 is provided on the cylindrical screen 11;
[0046] The gas collecting hood 16 is also connected to a steam extraction pump 17 .
[0047] In the present application, when steam is used to blow and clear the cylindrical screen 11, a large amount of steam will affect the operator's field of view and the working environment. At this time, the steam extraction pump 17 connected to the gas collecting hood 16 is opened to suck away the ejected steam. At the same time, a heat exchanger can be set on the pipeline between the gas collecting hood 16 and the steam extraction pump 17 to condense the steam to reduce the adverse effects of steam on the steam extraction pump 17.
[0048] like Figure 5 As shown, optionally, the steam injection device 14 includes a steam header 141 , one side of the steam header 141 is connected to a plurality of steam nozzles 142 , and the other side is connected to the steam pipeline 4 through a plurality of steam supply pipes 143 .
[0049] In the present application, when in use, the steam (pressure is 0.5-0.8 MPa) provided by the steam pipeline 4 is introduced into the steam supply pipe 143, and then distributed to the steam nozzle 142 for spraying through the steam header 141 connected to the steam supply pipe 143. The pressurized steam sprayed from the steam nozzle 142 blows the cylindrical screen 11, blows off the coal slurry adhering to the screen, and the blown-off coal slurry falls into the cylindrical screen 11 for screening.
[0050] like Figure 6 As shown, optionally, the discharge chute 3 is further connected to the sewage treatment device 8 through a pipeline;
[0051] A filter 9 is also provided between the discharge trough 3 and the sewage treatment device 8;
[0052] The filter 9 is also connected to the coarse material collecting box 7 .
[0053] During use, when the discharge trough 3 is regularly cleaned, clean water supplied from the cleaning water pipeline 5 is passed into the discharge trough 3 to rinse away the coal slurry adhering to the inner wall of the discharge trough 3. The wastewater containing coal slurry generated by cleaning the discharge trough 3 is discharged from the bottom of the discharge trough 3, filtered through the filter 9, and the filtrate enters the wastewater treatment device 8 for centralized treatment before being fed into the rod mill 2 for rod grinding and slurry adjustment of the raw coal. The filter residue filtered out by the filter 9 is mainly coal powder, which can be transferred to the coarse material collection box 7 to be combined with the coarse material for recovery.
[0054] like Figure 7 and Figure 8 As shown, optionally, a cleaning pipe 32 is provided in the upper part of the discharge chute 3;
[0055] The cleaning pipe 32 is arranged along the inner wall of the discharge trough 3 in the circumferential direction, and a plurality of water distribution holes are opened on one side of the cleaning pipe 32 close to the inner wall of the discharge trough 3;
[0056] The cleaning pipe 32 is connected to the cleaning water line 5 through a pipeline.
[0057] The working process of a coal slurry preparation device is as follows:
[0058] During use, the raw coal is input into the rod mill 2 from the material input end of the rod mill 2, and an appropriate amount of water is added at the same time. The rod mill 2 is used to crush the raw coal blocks to form coal slurry. The ground coal slurry is input into the drum screen 1 from the material output end of the rod mill 2. The driving device 15 on the frame 12 (such as a pulley, gear, etc. driven by a motor) drives the cylindrical screen 11 to screen the coal slurry. The coal slurry with qualified particle size is screened off and falls into the receiving hopper 13, and then input into the discharge trough 3; the coal blocks that fail to pass through the screen are output from the other end of the cylindrical screen 11 and fall into the coarse material collection box 7, and then return to the rod mill 2 for further crushing. When the cylindrical screen 11 is screening the coal slurry, the concentration of the coal slurry is relatively high, which will cause the coal slurry to adhere to the cylindrical screen 11, resulting in smaller mesh openings and affecting the screening effect of the coal slurry. At this time, the steam provided by the steam pipeline 4 (pressure is 0.5~0.8Mpa) is passed into the steam supply pipe 143 and then distributed to the steam nozzle 142 through the steam manifold 141 connected to the steam supply pipe 143 for spraying. The pressurized steam sprayed from the steam nozzle 142 blows the cylindrical screen 11, blows off the coal slurry adhering to the screen, and the blown-off coal slurry falls into the cylindrical screen 11 for screening. When using steam to blow and clear the cylindrical screen 11, a large amount of steam will affect the operator's observation field of view and the working environment. At this time, the steam extraction pump 17 connected to the gas collecting hood 16 is opened to suck away the ejected steam. At the same time, a heat exchanger can be set on the pipeline between the gas collecting hood 16 and the steam extraction pump 17 to condense the steam to reduce the adverse effects of the steam on the steam extraction pump 17.
[0059] The screened coal slurry that falls into the discharge trough 3 is stirred by the stirring device in the discharge trough 3 to prevent the coal slurry from settling. The coal slurry is then pumped into the coal slurry gasification device 6 through the discharge pump 31 for reaction. If the coal slurry concentration in the discharge trough 3 does not meet the standard, the discharge pump 31 transfers the unqualified coal slurry to the rod mill 2 for re-grinding and slurry adjustment.
[0060] When the discharge trough 3 is regularly cleaned, clean water supplied from the cleaning water pipeline 5 is passed into the cleaning pipe 32. The cleaning water is sprayed out from the water distribution holes on the side of the cleaning pipe 32 and flows down the upper inner wall of the discharge trough 3, washing away the coal slurry adhering to the inner wall of the discharge trough 3. The wastewater containing coal slurry generated by cleaning the discharge trough 3 is discharged from the bottom of the discharge trough 3, filtered through the filter 9, and the filtrate enters the wastewater treatment device 8 for centralized treatment before being input into the rod mill 2 for rod grinding and slurry adjustment of the raw coal. The filter residue filtered out by the filter 9 is mainly coal powder, which can be transferred to the coarse material collection box 7 to be combined with the coarse material for recovery.
[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A coal slurry preparation device, comprising a drum screen (1) and a rod mill (2) connected to the drum screen (1), characterized in that: The drum screen (1) is also connected to the discharge trough (3) and the steam pipeline (4) respectively; The discharge trough (3) is also connected to a cleaning water pipeline (5), and the discharge trough (3) is also connected to a coal slurry gasification device (6) and a rod mill (2) respectively via a discharge pump (31).
2. The coal slurry preparation device according to claim 1, characterized in that: The drum screen (1) is also connected to a coarse material collecting box (7), and the coarse material collecting box (7) is also connected to the material input end of the rod mill (2).
3. The coal slurry preparation device according to claim 1, characterized in that: The drum screen (1) comprises a cylindrical screen (11) and a frame (12) for mounting the cylindrical screen (11); a receiving hopper (13) is provided below the cylindrical screen (11); the receiving hopper (13) is connected to the frame (12) via a plurality of support rods (131); and an output end of the receiving hopper (13) is connected to a discharge trough (3); Steam injection devices (14) are respectively provided on both sides of the cylindrical screen (11), and the steam injection devices (14) are connected to the steam pipeline (4); The frame (12) is provided with a driving device (15) that matches the cylindrical screen (11).
4. The coal slurry preparation device according to claim 3, characterized in that: The cylindrical screen (11) is covered with an air collecting cover (16); The gas collecting hood (16) is also connected to a steam extraction pump (17).
5. The coal slurry preparation device according to claim 3, characterized in that: The steam injection device (14) comprises a steam header (141), one side of which is connected to a plurality of steam nozzles (142), and the other side of which is connected to a steam pipeline (4) via a plurality of steam supply pipes (143).
6. The coal slurry preparation device according to claim 1, characterized in that: The discharge trough (3) is also connected to a sewage treatment device (8) via a pipeline; A filter (9) is also provided between the discharge trough (3) and the sewage treatment device (8); The filter (9) is also connected to the coarse material collecting box (7).
7. The coal slurry preparation device according to any one of claims 1 to 6, characterized in that: A cleaning pipe (32) is provided at the upper inner portion of the discharge trough (3); The cleaning pipe (32) is arranged along the circumference of the inner wall of the discharge trough (3), and a plurality of water distribution holes are opened on one side of the cleaning pipe (32) close to the inner wall of the discharge trough (3); The cleaning pipe (32) is connected to the cleaning water pipeline (5) through a pipeline.