Lossless digital storage device for medium cleaning of coal preparation plant

Abstract

The utility model provides a coal preparation plant medium cleaning lossless digital storage device which comprises a stock bin, an inlet of the stock bin is connected with an outlet of a bucket elevator, the stock bin is used for conveying a coal preparation plant medium for feeding, and a level gage, a temperature and humidity sensor and an oxygen content sensor are arranged in the stock bin. The level gage, the temperature and humidity sensor and the oxygen content sensor are connected with the PLC control cabinet, a gas inlet of the stock bin is connected with an outlet of the nitrogen making machine and used for inputting nitrogen into the stock bin, a bottom outlet of the stock bin is connected with an inlet of the spiral feeder, an outlet of the spiral feeder is connected with an inlet of the concentrated medium barrel, and the concentrated medium barrel is connected with the nitrogen making machine. An outlet of the concentrated medium barrel is connected with an inlet of the conveying pump, an outlet of the conveying pump is connected with a conveying pipe to the combined medium barrel, and the other conveying pipe is provided with a circulating pipe which is connected to the concentrated medium barrel in a backflow mode. According to the utility model, the full-process clean, lossless and digital management of the medium of the coal preparation plant from feeding, storage to preparation is realized, the production efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal preparation equipment technology, specifically a digital storage device for clean and non-destructive media in coal preparation plants. Background Technology

[0002] Currently, coal preparation plants generally use the traditional method of transporting media by loader and adding media in a thickener tank, which has the following problems:

[0003] (1) High medium loss: Dust flies during the loader's transport process, and the lack of real-time monitoring of the medium addition in the concentrated medium tank leads to generally high medium consumption per ton of coal;

[0004] (2) Insufficient enclosure: When the medium is stored in the open or in a simple manner, it is prone to moisture and clumping, and dust is easily mixed in. At the same time, iron powder reacts with water and oxygen to produce loose oxidation products, which leads to poor medium quality and increased loss.

[0005] (3) Poor preparation efficiency: The medium preparation process is inefficient and has low precision. The entire process of unloading, storage and preparation cannot be unmanned and digitally controlled. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this utility model provides a clean and non-destructive digital storage device for coal preparation plants, which integrates closed storage, precise metering, intelligent preparation, and digital control to achieve the goal of "storage and addition of media without visibility, and digital unloading and preparation".

[0007] The technical solution provided by this utility model is as follows: A digital storage device for clean and non-destructive media in a coal preparation plant, comprising a silo, the inlet of which is connected to the outlet of a bucket elevator for feeding coal preparation plant media; a level gauge, a temperature and humidity sensor, and an oxygen content sensor are installed inside the silo, which are connected to a PLC control cabinet; the air inlet of the silo is connected to the outlet of a nitrogen generator for inputting nitrogen into the silo; the bottom outlet of the silo is connected to the inlet of a screw feeder; the outlet of the screw feeder is connected to the inlet of a thickener tank; the outlet of the thickener tank is connected to the inlet of a conveying pump; the outlet of the conveying pump is connected to one conveying pipe to the thickener tank, and another is provided with a circulation pipe for return flow to the thickener tank.

[0008] Furthermore, the feed inlet of the bucket elevator is equipped with a square discharge hopper suitable for the width of the truck and the volume of the coal preparation plant medium. A weighing sensor is installed below the hopper to measure the amount of coal preparation plant medium entering the hopper. The weighing sensor is connected to the PLC control cabinet.

[0009] Furthermore, the silo is a steel structure sealed silo with a polished stainless steel inner wall. The silo as a whole is a combination of a cylindrical top and a conical bottom, with the cone angle of the conical section being 60° to 70°.

[0010] Furthermore, the hopper is equipped with an electro-hydraulic flat gate at both its inlet and outlet, and the two electro-hydraulic flat gates are respectively connected to the PLC control cabinet.

[0011] Furthermore, the level gauge is a 3D radar level gauge, and a silo wall vibrator is installed at the bottom of the silo.

[0012] Furthermore, the nitrogen generator is connected to the PLC control cabinet, and the nitrogen injection volume is automatically adjusted through the oxygen content sensor. The temperature and humidity sensor is linked to the nitrogen generator for control.

[0013] Furthermore, the screw feeder is equipped with a frequency converter and a weighing module, and the variable frequency motor is controlled by a PLC to achieve precise feeding.

[0014] Furthermore, an ultrasonic level gauge is installed inside the concentrated medium tank, and an electromagnetic flow meter and an electric valve A are installed on the water inlet pipe of the concentrated medium tank. The electromagnetic flow meter and the electric valve A are respectively connected to the PLC control cabinet.

[0015] Furthermore, a ladder is provided on the side wall of the concentrated medium tank.

[0016] Furthermore, a densitometer and an electric valve B are installed on the circulation pipe, and an electric valve C is installed on the delivery pipe. The delivery pump, densitometer, electric valve B, and electric valve C are all connected to the PLC control cabinet to ensure that the coal preparation plant medium delivered to the mixing tank meets the production medium requirements.

[0017] This utility model combines PLC control, sensors, industrial Ethernet and other technologies to build a full-process intelligent management and control system, which realizes precise, unmanned, non-destructive and digital management of coal preparation plant media from feeding, storage, transportation and preparation, improves production efficiency and reduces labor intensity, and has high practical value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] In the diagram: 1—Booth, 2—Bucket elevator, 3—Level gauge, 4—Temperature and humidity sensor, 5—Oxygen content sensor, 6—PLC control cabinet, 7—Nitrogen generator, 8—Screw feeder, 9—Concentrated medium tank, 10—Transfer pump, 11—Transfer pipe, 12—Circulation pipe, 13—Electro-hydraulic flat gate, 14—Blouse vibrator, 15—Ultrasonic level gauge, 16—Electromagnetic flow meter, 17—Electric valve A, 18—Ladder, 19—Density meter, 20—Electric valve B, 21—Electric valve C. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 The illustrated coal preparation plant media cleaning and non-destructive digital storage device includes a closed storage system, a metering feeding system, an intelligent preparation system, and an intelligent control system.

[0024] The enclosed storage system includes a silo 1, which is a fully enclosed silo design. It adopts a steel structure sealed silo (polished stainless steel inner wall), and is a combination silo of cylindrical and conical sections. The upper cylindrical section is used for large-capacity storage, and the lower conical section guides the material to the outlet through a large inclination angle, eliminating dead corners. The inclination angle of the conical section can be designed independently to meet the conditions for downward sliding. It is a classic and efficient structure for bulk material storage.

[0025] Cone angle (the angle between the generatrix of the cone and the axis): Two conditions must be met simultaneously:

[0026] (1) Greater than the angle of repose of iron powder (the angle of repose of iron powder when it is naturally stacked is about 35° to 40°, which is the critical angle at which the material itself does not flow).

[0027] (2) The "sliding force > friction force" must be satisfied (based on the coefficient of friction, the cone angle must be > 40°).

[0028] Recommended cone angle: 60°~70°.

[0029] The silo 1 is equipped with a level gauge 3, a temperature and humidity sensor 4, and an oxygen content sensor 5. These sensors are connected to a PLC control cabinet 6. The air inlet of the silo 1 is connected to the outlet of the nitrogen generator 7 for inputting nitrogen gas into the silo 1.

[0030] The material silo 1 is equipped with an electro-hydraulic flat gate 13 at its inlet and outlet, and the two electro-hydraulic flat gates 13 are respectively connected to the PLC control cabinet 6 to achieve silo closure.

[0031] The level gauge 3 is a 3D radar level gauge that monitors inventory in real time. The nitrogen generator 7 is connected to the PLC control cabinet 6 and is equipped with a nitrogen injection device. The nitrogen injection volume is automatically adjusted by an oxygen content sensor to control the oxygen concentration in the silo below 5% to prevent oxidation of the medium. The bottom of the silo 1 is equipped with a silo wall vibrator 14, which, together with anti-oxidation and humidity control, effectively prevents the silo blockage caused by iron powder caking and failing to fall.

[0032] Intelligent temperature and humidity control is achieved through the linkage between temperature and humidity sensor 4 and nitrogen generator 7, which injects dry nitrogen into the chamber to keep the humidity below 50%. This isolates oxygen (reducing oxidation) and keeps the chamber dry (nitrogen dew point ≤ -40℃), making it suitable for storing high-purity iron powder.

[0033] The metering feeding system includes a bucket elevator 2. The inlet of the silo 1 is connected to the outlet of the bucket elevator 2 for feeding coal preparation plant media. The inlet of the bucket elevator 2 is equipped with a square unloading hopper suitable for the width of the truck and the volume of the coal preparation plant media. A weighing sensor is installed below the unloading hopper to measure the amount of coal preparation plant media entering the silo. The weighing sensor is connected to the PLC control cabinet 6.

[0034] The intelligent preparation system includes a screw feeder 8. The bottom outlet of the hopper 1 is connected to the inlet of the screw feeder 8, and the outlet of the screw feeder 8 is connected to the inlet of the concentrated medium tank 9. The screw feeder 8 is equipped with a frequency converter and a weighing module. The frequency converter motor is controlled by a PLC to achieve precise feeding.

[0035] An ultrasonic level gauge 15 is installed inside the concentrate tank 9. An electromagnetic flow meter 16 and an electric valve A 17 are installed on the water inlet pipe of the concentrate tank 9. The electromagnetic flow meter 16 and the electric valve A 17 are respectively connected to the PLC control cabinet 6. The medium is accurately prepared based on the feed weight, water volume, and liquid level, and the density of the concentrate tank is monitored by a density meter installed on the circulation detection pipeline. A ladder 18 is provided on the side wall of the concentrate tank 9.

[0036] The outlet of the thickening tank 9 is connected to the inlet of the transfer pump 10. The outlet of the transfer pump 10 is connected to one transfer pipe 11 leading to the thickening tank, and another pipe 12 is connected to the thickening tank 9 via a circulation pipe. A densitometer 19 and an electric valve B 20 are installed on the circulation pipe 12, and an electric valve C 21 is installed on the transfer pipe 11. The transfer pump 10, densitometer 19, electric valve B 20, and electric valve C 21 are all connected to the PLC control cabinet 6 to ensure that the coal preparation plant medium delivered to the thickening tank meets the production medium requirements.

[0037] The intelligent control system comprises a data acquisition layer and an intelligent decision-making layer. The data acquisition layer integrates data from 3D radar level gauges, oxygen content sensors, temperature and humidity sensors, electromagnetic flow meters, liquid level gauges, and density meters, and uses a PLC control system to achieve data acquisition and equipment control. The intelligent decision-making layer constructs a "medium input – medium storage – medium production" correlation model, optimizes storage strategies based on production medium requirements, and achieves media non-destructive processing.

[0038] The above description is merely a detailed description of the specific implementation scheme of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made on the design concept of this utility model should be included within the protection scope of this utility model.

Claims

1. A digital reserve device for cleaning and non-destructive medium in a coal preparation plant, characterized in that It includes a bunker (1), the inlet of the bunker (1) is connected to the outlet of a bucket elevator (2) for conveying the medium of the coal preparation plant for feeding. A level gauge (3), a temperature and humidity sensor (4) and an oxygen content sensor (5) are arranged in the bunker (1). The level gauge (3), the temperature and humidity sensor (4) and the oxygen content sensor (5) are connected to a PLC control cabinet (6). The air inlet of the bunker (1) is connected to the outlet of a nitrogen generator (7) for inputting nitrogen into the bunker (1). The bottom discharge port of the bunker (1) is connected to the inlet of a screw feeder (8), the outlet of the screw feeder (8) is connected to the inlet of a concentrated medium tank (9), the outlet of the concentrated medium tank (9) is connected to the inlet of a transfer pump (10), and one outlet of the transfer pump (10) is connected to a transfer pipe (11) to a combined medium tank, and the other is provided with a circulation pipe (12) which is connected back to the concentrated medium tank (9).

2. The digital reserve device for cleaning and non-destructive medium in a coal preparation plant according to claim 1, characterized in that, A square discharge hopper suitable for the width of the truck and the volume of the medium of the coal preparation plant is arranged at the inlet of the bucket elevator (2), and a weighing sensor is equipped below the discharge hopper for measuring the amount of the medium of the coal preparation plant entering the bunker, and the weighing sensor is connected to the PLC control cabinet (6).

3. A digital reserve device for cleaning and non-destructively storing media in a coal preparation plant according to claim 1, characterized in that, The bunker (1) adopts a steel structure sealed bunker with a polished stainless steel inner wall. The overall shape of the bunker is a combination of a cylindrical top and a conical bottom, and the cone angle of the conical section is 60°-70°.

4. A digital reserve device for cleaning and non-destructively storing media in a coal preparation plant according to claim 1, characterized in that, An electro-hydraulic flat gate (13) is respectively arranged at the inlet and outlet of the bunker (1), and the two electro-hydraulic flat gates (13) are respectively connected to the PLC control cabinet (6).

5. A digital reserve device for cleaning and non-destructively storing media in a coal preparation plant according to claim 1, characterized in that, The level gauge (3) is a 3D radar level gauge, and a bunker wall vibrator (14) is arranged at the bottom of the bunker (1).

6. The digital reserve device for cleaning and non-destructive medium in a coal preparation plant according to claim 1, wherein The nitrogen generator (7) is connected to the PLC control cabinet (6), and the nitrogen injection amount is automatically adjusted through the oxygen content sensor (5), and the temperature and humidity sensor (4) is linked with the nitrogen generator (7) for control.

7. A digital reserve device for cleaning and non-destructive medium in a coal preparation plant according to claim 1, characterized in that, The screw feeder (8) is equipped with a frequency converter and a weighing module, and the frequency conversion motor is controlled by the PLC to achieve precise feeding.

8. A digital reserve device for cleaning and non-destructively storing media in a coal preparation plant according to claim 1, characterized in that, An ultrasonic level gauge (15) is installed in the concentrated medium tank (9), and an electromagnetic flowmeter (16) and an electric valve A (17) are installed on the water adding pipe of the concentrated medium tank (9). The electromagnetic flowmeter (16) and the electric valve A (17) are respectively connected to the PLC control cabinet (6).

9. The digital reserve device for cleaning and non-damaging medium in a coal preparation plant according to claim 1, wherein A ladder (18) is arranged on the side wall of the concentrated medium tank (9).

10. A digital reserve device for cleaning and non-destructively storing media in a coal preparation plant according to claim 1, characterized in that, A density meter (19) and an electric valve B (20) are arranged on the circulation pipe (12), an electric valve C (21) is arranged on the transfer pipe (11), and the transfer pump (10), the density meter (19), the electric valve B (20) and the electric valve C (21) are all connected to the PLC control cabinet (6) to ensure that the medium of the coal preparation plant transported to the combined medium tank meets the production medium requirements.

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