Stone powder grinding, preparing and storing system
By combining the use of hammer crusher, mill, cyclone separator and bag dust collector, the problems of excessive particle size and excessive air pressure in the limestone powder grinding system are solved, and the stable operation of the system is achieved.
Patent Information
- Application Number
- CN202421838872.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In the existing limestone powder grinding system, the powder particle size is too large and the system air pressure is too high, resulting in unstable operation.
Through the combination of hammer crusher, mill, cyclone separator, screw conveyor and bag dust collector, double grinding of powder and gas separation are achieved, combined with the use of air pressure valve and locking flap valve, ensuring the particle size is qualified and the system air pressure is balanced.
The particle size pass rate of powder is improved, the system is maintained stable operation, preventing excessive air pressure, and ensuring the system is operating normally under negative pressure.
Smart Images
Figure CN223288194U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power plant boiler deburring, in particular to a limestone powder grinding, preparation and storage system. Background Art
[0002] In the chemical industry, limestone powder is a common desulfurizer used in power plant furnaces. With the development of my country's chemical industry, demand for limestone powder desulfurizers is increasing. Existing limestone grinding systems often produce insufficiently ground limestone powder, resulting in the finished powder containing oversized particles. This oversized powder can affect the reaction efficiency of the powder in the circulating fluidized bed boiler furnace, leading to overall system instability. Furthermore, the existing grinding system uses a blower to convey the powder, continuously introducing air into the system. This increases the system pressure over time, but the powder preparation system must operate under negative pressure, leading to unstable operation. Summary of the Invention
[0003] Aiming at the shortcomings of the existing stone powder grinding, preparation and storage system, such as the powder particle size prepared is too large and the air pressure in the system is too high, resulting in unstable operation, the utility model provides a stone powder grinding, preparation and storage system, which has stable system operation.
[0004] A stone powder grinding, preparation and storage system, which includes a ground hopper, the outlet of the ground hopper is connected to a feeder, the outlet of the feeder is connected to one end of a belt conveyor, and the other end of the belt conveyor is connected to the inlet of a hammer crusher. It is characterized in that: the outlet of the hammer crusher is connected to the inlet of a first elevator, the outlet of the first elevator is connected to a pre-grinding bin, the outlet of the pre-grinding bin is connected to one end of a belt weighing feeder, the other end of the belt weighing feeder is connected to the first inlet of a mill, the outlet of the mill is connected to a cyclone separator, the bottom discharge port of the cyclone separator is connected to the inlet of a screw conveyor, the outlet of the screw conveyor is connected to the inlet of a second elevator, and the outlet of the second elevator is connected to a finished powder bin.
[0005] It is further characterized by:
[0006] A powder classifier is provided in the grinding mill;
[0007] The top of the cyclone separator is connected to the inlet of the blower through a pipeline, the outlet of the blower is connected to the first bag dust collector and the second inlet of the grinder through pipelines respectively, and the bottom discharge port of the first bag dust collector is connected to the screw conveyor;
[0008] A second bag dust collector is installed on the top of the pre-grinding bin;
[0009] The outlet of the second elevator and the top pressure relief port of the finished powder bin are respectively connected to the inlet of the third bag dust collector through pipes, and the bottom discharge port of the third bag dust collector is connected to the finished powder bin through a pipe;
[0010] The pipe between the blower and the first bag dust collector, the pipe between the second elevator and the third bag dust collector, and the pipe between the finished powder bin and the third bag dust collector are respectively provided with an air pressure valve;
[0011] The discharge port of the cyclone separator is equipped with an air-locking flap valve.
[0012] In the above structure of the present invention, the stone is first crushed by a hammer crusher, and then passes through the second elevator, the pre-grinding bin, the belt weighing feeder, and enters the mill for further grinding in the mill. The powder with qualified particle size enters the cyclone separator, the cyclone separator separates the powder and gas, and the powder enters the screw conveyor from the bottom outlet, and then the powder enters the finished powder bin through the screw conveyor and the second elevator. The stone is ground twice by the hammer crusher and the mill. The powder selector ensures that only powder with qualified particle size can enter the finished product warehouse, ensuring that the powder particle size is qualified and improving the stability of the system operation. The cyclone separator separates the air and powder. The screw conveyor and the second elevator both use non-air flow transportation to transport the powder, so that air will not enter the finished powder bin, ensuring the air pressure balance of the system. When the system air pressure is unbalanced, the air pressure valve will open, and the excess air will enter the first, second, and third bag dust collectors. After dust removal, the excess air will be discharged into the atmosphere, thereby regulating the air pressure and further ensuring the stability of the system operation. The air-locking flap valve installed at the discharge port of the cyclone separator can further prevent air from entering the screw conveyor, further improving the system operation stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION
[0014] See Figure 1, a stone powder grinding, preparation and storage system, which includes a ground hopper 1, the outlet of the ground hopper 1 is connected to the feeder 2, the outlet of the feeder 7 is connected to one end of the belt conveyor 3, the other end of the belt conveyor 3 is connected to the inlet of the hammer crusher 4, the outlet of the hammer crusher 4 is connected to the inlet of the first elevator 5, the outlet of the first elevator 5 is connected to the first inlet of the pre-grinding bin 6, and a second bag dust collector 15 is installed on the top of the pre-grinding bin 6; the outlet of the pre-grinding bin 6 is connected to one end of the belt weighing feeder 7, and the other end of the belt weighing feeder 7 is connected to the first inlet of the mill 8, and a powder classifier (not shown in the figure) is arranged in the mill 8; the outlet of the mill 8 is connected to the cyclone separator 12, the bottom discharge port of the cyclone separator 12 is connected to the inlet of the screw conveyor 9, the outlet of the screw conveyor 9 is connected to the inlet of the second elevator 10, and the outlet of the second elevator 10 is connected to the finished powder bin 11.
[0015] The top air outlet of the cyclone separator 12 is connected to the inlet of the blower 13 through a pipeline. The outlet of the blower 13 is connected to the first bag dust collector 14 and the second inlet of the grinder 8 through pipelines respectively. The bottom discharge port of the first bag dust collector 14 is connected to the screw conveyor 9.
[0016] The outlet of the second elevator 10 and the top pressure relief port of the finished powder bin 11 are respectively connected to the inlet of the third bag dust collector 16 through pipes, and the bottom discharge port of the third bag dust collector 16 is connected to the finished powder bin 11 through a pipe;
[0017] The pipe between the blower 13 and the first bag dust collector 14, the pipe between the second elevator 10 and the third bag dust collector 16, and the pipe between the finished powder bin 11 and the third bag dust collector are respectively provided with an air pressure valve 18;
[0018] An air-locking flap valve 17 is installed at the discharge port of the cyclone separator 12 to prevent air from entering the screw conveyor 9 .
[0019] During use, the stone in the ground hopper 1 passes through the feeder 2 and the belt conveyor 3 and enters the hammer crusher 4 for primary crushing. The crushed material enters the first elevator 5 and is transported to the pre-grinding bin 6 for temporary storage. After the crushed material exits the bin, it passes through the belt weighing feeder 7 and enters the mill 8 for secondary grinding. The fine powder ground in the mill 8 is transported by air from the blower 13. After passing through the powder selector, those with the required particle size enter the cyclone separator 12, while those that do not meet the requirements continue to be ground in the mill 8. The cyclone separator 12 separates the powder and air. The powder enters the screw conveyor 9 from the bottom discharge port through the air lock flap valve 17. Through the screw conveyor 9, it is sent to the finished powder bin 11 by the second elevator 10. The air separated by the cyclone separator 12 carries a small amount of powder back to the grinder 8 through the blower 13; when the system pressure is too high, the air pressure valve 18 opens, and the air separated by the cyclone separator 12 enters the first bag dust collector 14, and is discharged into the atmosphere after dust removal. The removed dust enters the screw conveyor 9 from the bottom outlet of the first bag dust collector 14 and is transported to the finished powder bin 11.
[0020] The air pressure valve 18 is in a closed state when the system air pressure is normal. When the air pressure in the pre-grinding bin 6 and the finished powder bin 11 is too high, the air pressure valve 18 opens, and part of the air enters the second bag dust collector 15 and the third bag dust collector 16. The air is discharged into the atmosphere after dust removal until the air pressure in the pre-grinding bin 6 and the finished powder bin 11 returns to the specified level, and the removed dust falls back into the pre-grinding bin 6 and the finished powder bin 11.
Claims
1. A stone powder grinding, preparation and storage system, comprising a ground hopper, the outlet of which is connected to a feeder, the outlet of which is connected to one end of a belt conveyor, the other end of which is connected to the inlet of a hammer crusher, characterized in that: The outlet of the hammer crusher is connected to the inlet of the first elevator, the outlet of the first elevator is connected to the pre-grinding bin, the outlet of the pre-grinding bin is connected to one end of a belt weighing feeder, the other end of the belt weighing feeder is connected to the first inlet of the mill, the outlet of the mill is connected to a cyclone separator, the bottom discharge port of the cyclone separator is connected to the inlet of a screw conveyor, the outlet of the screw conveyor is connected to the inlet of a second elevator, the outlet of the second elevator is connected to a finished powder bin, the top of the cyclone separator is connected to the inlet of a blower through a pipeline, the outlet of the blower is respectively connected to a first bag dust collector and the second inlet of the mill through pipelines, and the bottom discharge port of the first bag dust collector is connected to a screw conveyor; A second bag dust collector is installed on the top of the pre-grinding bin; the outlet of the second elevator and the top pressure relief port of the finished powder bin are respectively connected to the inlet of the third bag dust collector through pipes, and the bottom discharge port of the third bag dust collector is connected to the finished powder bin through a pipe; the pipe between the blower and the first bag dust collector, the pipe between the second elevator and the third bag dust collector, and the pipe between the finished powder bin and the third bag dust collector are respectively provided with air pressure valves; the discharge port of the cyclone separator is installed with an air locking flap valve.
2. The stone powder grinding, preparation and storage system according to claim 1, characterized in that: A powder classifier is provided in the grinding mill.