CN201052472Y - Liquid-solid fluid bed coarse slime size classification grading device - Google Patents

Abstract

A sorting and grading device for coarse coal slime in a liquid-solid fluidized bed. The upper barrel and the lower barrel are connected by flanges. The barrel is equipped with a PID automatic control system, and the upper part of the upper barrel is equipped with a concentrate conduit. Its top is equipped with a clean coal guide trough whose bottom is inclined to communicate with the concentrate conduit, and the top of the upper barrel body is provided with a clean coal overflow groove with an inclined bottom to increase the overflow area. The upper part of the feeding barrel is equipped with a feeding hopper that feeds in a swirling flow, and the outlet is equipped with a conical distribution plate connected to the screw; the lower barrel is equipped with a liquid distributor that communicates with the external pipe, and the bottom is set. There are conical tailing coal diversion grooves. Coarse slime enters the separator statically and evenly through the static circular uniform feeding device and moves downward. When encountering the fluidized bed, the particles with a density higher than the density of the fluidized bed pass through the bed and enter the bottom flow as tailings. When discharged, particles with a density lower than that of the fluidized bed cannot pass through the bed, and are brought into the overflow by the rising water flow, and discharged as clean coal to achieve fluidized separation of coarse coal slime.

Description

Liquid-solid fluidized bed coarse slime separation and classification device

technical field

The utility model relates to a sorting and grading device for coarse coal slime in a liquid-solid fluidized bed, and is especially suitable for sorting or grading coarse coal slime.

Background technique

In recent years, a small number of coal preparation plants have used small-diameter dense medium cyclones or spiral separators to separate coarse coal slime, but due to the shortcomings of these two devices, satisfactory results cannot be achieved. Disadvantages of small-diameter dense medium cyclones: ①The requirements for medium particle size are too fine, the preparation and recovery of medium are difficult, and the cost is high; The lower limit is lower, but the classification efficiency of finer materials is low, and a part of the fine coal slime that has not been sorted enters the clean coal, affecting the ash content of the clean coal, and it cannot completely replace flotation. Disadvantages of the spiral separator: ①The separation density is high, the clean coal cannot meet the final required clean coal ash content, and its products cannot be sold as final products; The height is large, and at the same time mixing and distribution devices are required, and the distribution uniformity is difficult to control; ③The requirements for the concentration of the feed material are strict, and it is difficult to control in industrial production.

Utility model content

The purpose of the utility model is to provide a liquid-solid fluidized bed coarse coal slime sorting and grading device with simple structure, small footprint and good effect.

The liquid-solid fluidized bed coarse coal slime sorting and grading device of the utility model includes an upper barrel body and a lower barrel body connected by flanges, a PID automatic control system is arranged between the upper and lower barrel bodies, and the upper part of the upper barrel body It is equipped with a concentrate conduit, and its top is equipped with a clean coal guide trough whose bottom is inclined to communicate with the concentrate conduit. There is a feeding barrel, the upper part of the feeding barrel is equipped with a feeding hopper that feeds in a swirling flow, and the outlet is equipped with a conical distribution plate connected to the screw; the lower barrel is equipped with a liquid that communicates with the external pipe. The distributor has a conical tailing coal diversion groove at its bottom.

The PID automatic control system is composed of a PID control instrument, a pressure sensor connected to it on the upper barrel and an automatic control valve located at the outlet of the diversion groove; There is a hand wheel to adjust the discharge size of the distribution tray; the liquid distributor is composed of the fluid distribution main pipe controlled by the left and right valves, the ring branch pipe and the straight branch pipe connected with the fluid distribution main pipe, and the interval between the fluid distribution main pipe, the ring branch pipe and the straight branch pipe Several standpipes are arranged, and a fluid distribution cap is plugged into the standpipe, and a plurality of fluid injection holes are opened on the upper circumference of the fluid distribution cap; the clean coal overflow groove can be several circular rings or rectangles.

The beneficial effects of the utility model are:

1. The upper part of the column is equipped with a coarse coal slime static uniform feeding device to reduce the damage to the fluidized bed by feeding, and at the same time, the feeding barrel reduces the short circuit phenomenon of the material and improves the coarse coal slime separation effect;

2. The fluid distributor adopts a combination of a multi-pipe distributor and a side-flow distributor, and the opening direction is horizontal, which not only ensures the uniformity of the water intake, but also reduces the clogging of the water inlet hole and reduces the accident rate. It can stop without feeding;

3. The PID automatic control system can achieve basically uniform bed density or sorting density, which ensures high sorting accuracy, and realizes automatic operation, reducing the impact of human factors and feeding fluctuations on the sorting effect;

4. It can realize high-precision separation at low density (less than 1.4Kg/L), significantly reduce the ash content of clean coal, and improve product quality;

5. The structure of the equipment is simple, the cost is low, and the installation and adjustment are convenient.

6. When the input material is 14-20%, the ash content of the cleaned coal after sorting can reach below 10%, and the clean coal yield is greater than 60%.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is the A-A view of Fig. 1 .

Fig. 3 is an enlarged view of the cap of the fluid distributor of the present invention.

In the figure: 1-Into the hopper, 2-Handwheel, 3-Screw, 4-Into the barrel, 5-Clean coal tank, 6-Upper barrel, 7-Flange, 8-Lower barrel, 9-Fluid Distributor, 10-conical tailing coal diversion tank, 11-automatic control valve, 12-PID control instrument, 13-valve, 14-pressure sensor, 15-concentrate pipe, 16-feeding pipe, 17-clean coal Overflow tank, 9-1-valve, 9-2-fluid distributor main pipe, 9-3-fluid distributor ring branch pipe, 9-4-fluid distributor straight branch pipe, 9-5-fluid distributor cap, 9 -6-valve.

Detailed ways

The utility model will be further described below in conjunction with the embodiment in the accompanying drawings:

As shown in Fig. 1, the utility model is mainly composed of a barrel body, a static uniform feeding device, a PID automatic control system and a fluid distributor 9. The barrel body is composed of an upper barrel body 6 and a lower barrel body 8 connected by a flange 7. The static uniform feeding device is composed of a feed hopper 1 connected to the feed barrel 4, a lead screw 3 arranged in the feed barrel 5, and a screw connected to the feed barrel 5. The upper and lower ends of the bar 3 are composed of the hand wheel 2 and the distribution tray; the PID automatic control system is set between the upper and lower barrels, and the upper part of the upper barrel 6 is provided with a concentrate conduit 15, and the top of the barrel is equipped with a concentrate conduit 15 whose bottom is inclined. 15 interlinked clean coal channel 5, the top of the upper barrel body 6 is provided with a clean coal overflow groove 17 with an inclined bottom to increase the overflow area, and the feeding barrel 4 is located at the middle part of the upper barrel body 6, supported on The upper part of the upper barrel body 6, the feeding hopper 1 and the feeding barrel 4 are connected through a feeding pipe 16 with a 90° elbow, and the connection between the upper part of the feeding pipe 16 and the feeding hopper 1 adopts a flange that is easy to disassemble Connected, the feeding pipe 16 is inserted into the feeding barrel 4 tangentially, feeding in a swirling flow, the upper part of the feeding barrel 4 is closed, and the upper part is provided with a handwheel 2 fixed on the screw 3, and the screw 3 is fixed on the screw through a nut. In the middle of the feeding barrel 4, the outlet of the feeding barrel 4 is provided with a distribution plate connected to the lead screw 3, and the conical distribution plate can be adjusted up and down through the handle 2 on the top of the lead screw 3, thereby adjusting The space and speed of the material entering the liquid-solid fluidized bed can reduce the interference of the material on the fluidized bed, and achieve "static" uniform feeding. The lower barrel body 8 is provided with a liquid distributor 9 communicating with the external pipe, and a conical tailing coal diversion groove 10 is provided at the bottom thereof. The fluid distributor 9 is a unique fluid distributor that combines a multi-pipe distributor and a side flow distributor. The fluid distributor 9 consists of left and right valves 9-1 and 9-6, a control fluid distribution supervisor 9-2, The annular branch pipe 9-3 connected with the fluid distribution main pipe 9-2 and the straight branch pipe 9-4 are formed, as shown in Fig. 2 . The fluid distribution main pipe 9-2, the ring branch pipe 9-3 and the straight branch pipe 9-4 are provided with several standpipes at intervals, and the standpipes are inserted with a fluid distribution cap 9-5, as shown in FIG. 3 . There are two main water inlet pipes, which are parallel to each other across the barrel, and are connected to each branch water pipe. One of the two main water pipes is used as the water inlet pipe, and the other is used as the drain pipe when it is blocked. The two main water pipes are connected to several branch water pipes. , there is a certain distance between each branch water pipe, as the passage for tailings to pass through, there are several fluid distribution pipe caps 9-5 on each branch water pipe in the column body, and the circumference of the upper part of each water distribution pipe cap 9-5 There are several round holes with the same diameter on the wall, as the water inlet channel, the valves 9-1 and 9-2 for adjusting the water volume are installed on the two main water inlet pipes, and a water pressure gauge is also installed on the main water inlet pipe to measure Inlet pressure. An air inlet pipe is arranged on the total water inlet pipe, and the air inlet pipe can be used or not depending on the content of clean coal in the sorting tailings.

The control and adjustment of the device adopts a PID automatic control system. The PID automatic control system consists of a PID control instrument, which is connected to a pressure sensor 14 arranged on the upper barrel body 8 and an automatic pressure sensor arranged at the outlet of the conical tailings diversion groove 10. The control valve 11 constitutes. A valve 13 is provided below the pressure sensor 14, and its output signal is 4-20mA. The output value is related to the density of the fluidized bed in the column above the pressure sensor 14. The signal is transmitted to the PID control through two data lines Instrument 12, PID control instrument 12 compares the signal with the signal value corresponding to the density setting value, and then decides whether to open or close the automatic control valve 11 installed at the bottom of the column and the size of the switch, and passes the output signal through The two data lines are transmitted to the automatic control valve 11 , the valve executes the command, and at the same time, the automatic control valve feeds back the position signal of the valve to the PID control instrument 12 .

Working process: The material enters the feeding barrel 4 from the feeding hopper through the feeding pipe 1 with a 90° elbow along the tangent line, and moves down to the lower part of the feeding barrel 4 by gravity, and the conical distribution plate at the lower part of the feeding barrel 4 will The feed material is evenly distributed around the feeding barrel 4 and enters the barrel of the liquid-solid fluidized bed separator. The size of the gap between the conical distribution pan and the feeding barrel is determined by the upper circular hand wheel Adjust to ensure that the material enters the sorter evenly and statically. After the materials entering the sorting machine move down gradually for a certain distance, the materials start to be separated according to the density, and the low-density materials move upwards into the overflow tank 17 and enter the clean coal collection tank to become clean coal, and the higher density materials continue downward Moving to the bed of the fluidized bed, the material with a density higher than that of the bed of the fluidized bed passes through the bed and enters the bottom, and is discharged through the bottom flow automatic control valve 11 to become tailings, while the material with an intermediate density passes through the bed in the fluidized bed. Move up and down, gradually achieving separation over time. The formation of the fluidized bed is based on the medium and high density materials in the feed as the medium, and the rising water that enters through the fluid distributor 9 is used as the fluid to form a fluidized bed. The water pipe and the water distribution pipe cap enter the column along the horizontal direction, and then become an upward upward flow. The control of the whole sorting process realizes the automatic regulation and clean coal ash control through the automatic control system composed of the pressure sensor 14, the PID control instrument 12 and the automatic control valve 11.

Claims (5)

1. The liquid-solid fluidized bed coarse coal slime sorting and grading device is characterized in that it includes an upper barrel (6) and a lower barrel (8) connected as one by a flange (7). Equipped with a PID automatic control system, the upper part of the upper barrel body (6) is provided with a concentrate conduit (15), and its top is equipped with a clean coal guide trough (5) whose bottom is inclined and communicates with the concentrate conduit (15). The top of the barrel body (6) is provided with a clean coal overflow tank (17) with an inclined bottom to increase the overflow area, the middle part is provided with a feeding barrel (4), and the top of the feeding barrel (4) is provided with a rotating The feed hopper (1) for flow feed, the outlet is provided with a conical distribution pan connected to the lead screw (3); the lower barrel (8) is provided with a liquid distributor (9) connected to the external pipe , the bottom of which is provided with a conical tailing coal diversion groove (10). 2. The liquid-solid fluidized bed coarse coal slime sorting and grading device according to claim 1, characterized in that: the PID automatic control system is connected with the pressure on the upper barrel (8) by the PID control instrument. The sensor (14) is composed of an automatic control valve (11) arranged at the outlet of the conical tailing coal diversion groove (10). 3. The liquid-solid fluidized bed coarse coal slime sorting and grading device according to claim 1, characterized in that: the top of the screw (3) connected to the conical material distribution pan is provided with an adjusting material distribution pan discharge size handwheel (2). 4. The liquid-solid fluidized bed coarse coal slime sorting and grading device according to claim 1, characterized in that: said liquid distributor (9) is controlled by a fluid distribution main pipe (9-2) controlled by left and right valves, and fluid The distribution main pipe (9-2) is connected with the ring branch pipe (9-3) and the straight branch pipe (9-4), and the fluid distribution main pipe (9-2), the ring branch pipe (9-3) and the straight branch pipe (9-4) Several standpipes are arranged at the upper interval, and a fluid distribution cap (9-5) is plugged into the standpipe, and a plurality of fluid spray holes are arranged on the upper circumference of the fluid distribution cap (9-5). 5. The liquid-solid fluidized bed coarse coal slime separation and grading device according to claim 1, characterized in that: the clean coal overflow tank (17) can be several circular or rectangular.

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