CN211886311U - Coal slurry recoverer and coal slurry preparation system - Google Patents

Abstract

The utility model discloses a coal slurry recoverer, which comprises an outer cylinder and an injection pipe, wherein the outer cylinder comprises a mixing cylinder, a contraction pipe, a choke and a diffusion pipe which are connected in sequence along a central axis; one end of the mixing cylinder, which is far away from the throat pipe, is formed into an inlet end, and a cover plate is arranged on the inlet end; one end of the jet pipe is arranged in the mixing cylinder and is provided with a nozzle, and the other end of the jet pipe is positioned outside the mixing cylinder and is formed into a water inlet end; a flushing hole is arranged on the cover plate; the upper side of the mixing barrel is provided with a slurry inlet pipe, the slurry inlet pipe is provided with a slag discharge port, a filter screen is arranged in the slurry inlet pipe, and the filter screen is positioned below the slag discharge port in the vertical direction. The application also provides a coal slurry preparation system utilizing the coal slurry recoverer. Utilize this application, can retrieve the overflow coal slurry of following the drum sieve exhaust to continue to use, reduce the waste of raw materials coal.

Description

Coal slurry recoverer and coal slurry preparation system

Technical Field

The utility model relates to a coal slurry recoverer and coal slurry preparation system.

Background

Coal slurry is used as a raw material of coal chemical industry, at present, when the coal slurry is prepared, raw material coal, process water and an additive are generally sent into a coal mill according to a certain proportion to be ground to prepare the coal slurry with the mass concentration of about 62%, then the coal slurry is sent into a drum screen to be filtered, qualified coal slurry passing through the drum screen flows out through a discharge chute to be used by downstream processes, and waste slurry containing large-particle coal particles overflows out of the drum screen to be treated as waste materials. In the working process of the rotary screen, due to factors such as the change of the property of raw material coal, the change of the running state of the coal mill and the like, the coal slurry in the rotary screen overflows the rotary screen due to the increase of the coal slurry amount entering the rotary screen caused by the slurry running and the slurry overflowing, and therefore part of qualified coal slurry also enters a waste slurry system, and certain waste is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the application firstly provides a coal slurry recoverer which comprises an outer barrel and an injection pipe, wherein the outer barrel is provided with a central axis, the outer barrel comprises a mixing barrel, a contraction pipe, a throat pipe and a diffusion pipe which are sequentially connected along the central axis, and the mixing barrel, the contraction pipe, the throat pipe and the diffusion pipe are coaxially arranged; one end of the mixing cylinder, which is far away from the throat pipe, is formed into an inlet end, and a cover plate is arranged on the inlet end;

the jet pipe penetrates through the cover plate from outside to inside and then extends into the mixing cylinder, a nozzle is formed at one end of the jet pipe extending into the mixing cylinder, the nozzle extends into the contraction pipe, the jet direction of the nozzle faces the direction of the throat pipe, one end of the jet pipe, which is far away from the nozzle, is positioned outside the mixing cylinder and forms a water inlet end, and a water inlet is formed at the water inlet end;

a flushing hole is arranged on the cover plate; one end of the diffusion pipe, which is far away from the throat pipe, is formed into a water outlet;

the upper side of the mixing barrel is provided with a slurry inlet pipe, a slag discharge port is formed in the slurry inlet pipe, a slag discharge pipe is installed on the slag discharge port, a filter screen is installed in the slurry inlet pipe, and the filter screen is located below the slag discharge port in the vertical direction.

When the coal slurry recoverer is used, the slurry inlet pipe is connected to the overflow port of the rotary screen, so that coal slurry overflowing from the rotary screen enters the slurry inlet pipe, the coal slurry enters the outer cylinder after being filtered by the filter screen and is taken away by flushing water entering from the injection pipe, and the flushing water can be used as process water to enter the coal mill, so that most of overflowed coal slurry returns to the system for continuous use. The large-particle coal blocks separated by the filter screen can be processed in a centralized way, and the large-particle coal blocks can be used as raw material coal to be added into a coal mill for continuous use or can be used as fuel coal to be fed into a boiler for combustion. Therefore, the coal slurry recoverer can greatly reduce the waste of raw material coal. After the washing water is sprayed out of the nozzle, the washing water flows out of the coal slurry recoverer through the throat pipe and the diffusion pipe, and a certain negative pressure is formed in the mixing cylinder by utilizing the Venturi principle, so that the coal slurry and the washing water can be fully mixed, the flow velocity of the coal slurry in the mixing cylinder can be accelerated, and the adhesion of the coal slurry in the coal slurry recoverer is reduced.

Preferably, in order to reduce retention of the coal slurry in the coal slurry recovery device, the central axis of the outer cylinder is inclined, and the outlet of the outer cylinder faces downward in the inclined direction. Preferably, the included angle between the central axis of the outer cylinder and the horizontal plane is 20-45 degrees.

Secondly, the application also provides a coal slurry preparation system which comprises the coal slurry recoverer in any technical scheme, the coal slurry preparation system also comprises a coal mill, a rotary screen and a water inlet main pipe, the coal mill is provided with a feed inlet and a discharge outlet, the rotary screen is provided with a slurry inlet, a slurry outlet and an overflow port, the discharge outlet of the coal mill is communicated with the slurry inlet of the rotary screen, and the overflow port is communicated with a slurry inlet pipe of the coal slurry recoverer; a feed inlet of the coal mill is connected with a feed pipe;

three branch pipes are led out from the water inlet main pipe and are respectively a first branch pipe, a second branch pipe and a third branch pipe, wherein the first branch pipe is communicated with a water inlet of the coal slurry recoverer, the second branch pipe is communicated with a flushing hole of the coal slurry recoverer, the third branch pipe is led out of a coal grinding water pipe and a cleaning water pipe, the coal grinding water pipe is communicated with a coal pulverizer, and the cleaning water pipe is communicated with a feeding pipe; the water outlet of the coal slurry recoverer is communicated with a coal mill through a water return pipe.

The coal slurry preparation system is additionally provided with a coal slurry recoverer, when the coal slurry preparation system works, a coal mill grinds raw coal to form coal slurry, then the coal slurry enters a drum screen to be filtered and screened, and qualified coal slurry is discharged through a slurry outlet of the drum screen to enter the next procedure. The overflow coal slurry discharged from the overflow port of the drum screen enters a slurry inlet pipe of the coal slurry recoverer, when the overflow coal slurry passes through a filter screen in the drum, large-particle coal blocks are intercepted and discharged through a slag discharge pipe for centralized treatment, and the large-particle coal blocks can be continuously used as raw material coal to return to a system for recycling or used as fuel coal to be fed into a boiler for internal combustion. The overflow coal slurry entering the outer cylinder through the filter screen is taken away by the process water entering from the water inlet and returns to the coal mill to be used as raw materials for continuous use. The coal slurry preparation system can be used for smoothly recycling unqualified coal slurry discharged from the drum screen, and waste is reduced.

Furthermore, in order to avoid that coal slurry is deposited in the return pipe when the use is suspended, a drain pipe is arranged at the lowest point of the return pipe, and a drain valve is arranged on the drain pipe. When the coal slurry preparation system is suspended for use, the blow-down valve can be opened to empty the collected liquid of the water return pipe, so that scaling is avoided and the reuse of the equipment is not influenced.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a slurry reclaimer.

FIG. 2 is a schematic diagram of an embodiment of a coal slurry preparation system.

Detailed Description

First, the slurry reclaimer will be described in detail.

Referring to fig. 1, a coal slurry recoverer 200 includes an outer cylinder 10 and an injection pipe 12, the outer cylinder 10 has a central axis 100, and the outer cylinder 10 includes a mixing cylinder 11, a contraction pipe 13, a throat pipe 14 and a diffusion pipe 15 connected in sequence along the central axis. The mixing cylinder 11 is cylindrical, the contraction tube 13 is a tapered tube, the large end of the contraction tube 13 is connected to the mixing cylinder 11, and the small end of the contraction tube 13 is connected to one end of the throat tube 14. The diffuser 15 is also a tapered tube, the small end of the diffuser 12 is connected to the other end of the throat, and the large end of the diffuser 15 is a water outlet 151, i.e. the end of the diffuser 15 facing away from the throat 14 is formed as the water outlet 151.

The central axis 100 of the outer tube 10 is inclined, and the water outlet 151 of the outer tube 10 is directed downward in the inclined direction. In this embodiment, the angle α between the central axis 100 of the outer cylinder and the horizontal plane 110 is 30 °. It is understood that the angle α may also be 20 °, 35 ° or 45 ° in other embodiments, although the angle α may have other values between 20 ° and 45 °.

The mixing cylinder 11, the contraction pipe 13, the throat pipe 14 and the diffusion pipe 15 are coaxially arranged; the end of the mixing drum 11 facing away from the throat 14 is formed as an inlet end 111, on which inlet end 111 a cover plate 112 is mounted.

The injection pipe 12 penetrates through the cover plate from outside to inside and then extends into the mixing cylinder, a nozzle 123 is formed at one end of the injection pipe 12 extending into the mixing cylinder, the nozzle 123 extends into the shrinkage pipe 13, the injection direction of the nozzle 123 faces the direction of the throat pipe 14, one end of the injection pipe 12, which is away from the nozzle 123, is located outside the mixing cylinder and forms a water inlet end 121, and a water inlet 125 is formed at the water inlet end 121.

The cover plate 112 is provided with a flushing hole 113. The inner cavity of the outer cylinder is cleaned regularly through the flushing hole 113, so that scaling and blockage are avoided.

A slurry inlet pipe 21 is arranged on the upper side of the mixing barrel 11, a slag discharge port 23 is arranged on the slurry inlet pipe 21, a slag discharge pipe 24 is arranged on the slag discharge port 23, and the slag discharge pipe extends downwards along the inclined direction. A filter screen 22 is installed in the slurry inlet pipe 21, and the filter screen 22 is positioned below the slag discharge port 23 in the vertical direction. The top of the slurry inlet pipe 21 is provided with an overflow slurry inlet 211.

Referring to fig. 2, the coal slurry preparation system is described as above, the coal slurry recovery 100 of the coal slurry preparation system, and the coal mill 50, the trommel 30 and the water inlet manifold 60, the coal mill 50 has a feed inlet 51 and a discharge outlet 52, the trommel 30 has a slurry inlet 31, a slurry outlet 32 and an overflow outlet 33, the discharge outlet 52 of the coal mill 30 is communicated with the slurry inlet 31 of the trommel, and the overflow outlet 33 is communicated with the overflow slurry inlet 211 of the slurry inlet pipe of the coal slurry recovery 100. The inlet 5 of the coal mill is connected with a feed pipe 71. The feed pipe is used to feed the pulverized raw coal into the coal mill 50 for grinding. The coal mill 50 and the trommel 30 in this embodiment are conventional devices in the prior art, and are not described in detail. The slurry outlet 32 of the rotary screen 30 sends qualified coal slurry to the next process through a slurry pipe 35.

The water inlet main pipe 60 leads out three branch pipes, which are a first branch pipe 61, a second branch pipe 62 and a third branch pipe 63, respectively, wherein the first branch pipe 61 is communicated with the water inlet 125 of the coal slurry recoverer, and the second branch pipe 62 is communicated with the flushing hole 113 of the coal slurry recoverer. And a first valve 611 is installed in the first branch pipe 61 and a second valve 621 is installed in the second branch pipe 62.

The third branch 63 leads out a coal grinding water pipe 64 and a cleaning water pipe 65, the coal grinding water pipe 64 is communicated with the coal grinding mill 20, and the cleaning water pipe 65 is communicated with a feeding pipe 71. A first regulating valve 641 is attached to the coal grinding water pipe 64, and a second regulating valve 651 is attached to the cleaning water pipe 65. The cleaning water pipe 65 is used for cleaning the feeding pipe 71.

The water outlet 151 of the coal slurry recoverer is communicated with the coal mill 20 through a water return pipe 622, and the coal slurry collected from the coal slurry recoverer is returned to the coal mill 50, so that the raw material coal is saved. A control valve block 40 including a first cut valve 42, a control valve 41 and a second cut valve 46 sequentially installed on the third branch pipe is provided on the third branch pipe 63, both ends of a bypass pipe 43 are connected to the third branch pipe after crossing the first cut valve 42, the control valve 41 and the second cut valve 46, and a bypass valve 44 is installed on the bypass pipe 43.

A drain pipe 623 is provided at the lowest point of the return pipe 622, and a drain valve 624 is installed on the drain pipe 623.

The slag discharge pipe 24 of the coal slurry recoverer 100 is communicated with the coal slurry collecting chamber, larger coal blocks intercepted by the filter screen enter the collecting chamber through the slag discharge pipe for centralized treatment, and the coal blocks entering the collecting chamber can return to the coal mill for continuous use or can be used as coal for a boiler.

Claims (5)

1. A coal slurry recoverer is characterized by comprising an outer barrel and an injection pipe, wherein the outer barrel is provided with a central axis, the outer barrel comprises a mixing barrel, a contraction pipe, a throat pipe and a diffusion pipe which are sequentially connected along the central axis, and the mixing barrel, the contraction pipe, the throat pipe and the diffusion pipe are coaxially arranged; one end of the mixing cylinder, which is far away from the throat pipe, is formed into an inlet end, and a cover plate is arranged on the inlet end;

the jet pipe penetrates through the cover plate from outside to inside and then extends into the mixing cylinder, a nozzle is formed at one end of the jet pipe extending into the mixing cylinder, the nozzle extends into the contraction pipe, the jet direction of the nozzle faces the direction of the throat pipe, one end of the jet pipe, which is far away from the nozzle, is positioned outside the mixing cylinder and forms a water inlet end, and a water inlet is formed at the water inlet end;

a flushing hole is arranged on the cover plate; one end of the diffusion pipe, which is far away from the throat pipe, is formed into a water outlet;

the upper side of the mixing barrel is provided with a slurry inlet pipe, a slag discharge port is formed in the slurry inlet pipe, a slag discharge pipe is installed on the slag discharge port, a filter screen is installed in the slurry inlet pipe, and the filter screen is located below the slag discharge port in the vertical direction.

2. The coal slurry reclaimer of claim 1,

the central axis of the outer cylinder is obliquely arranged, and the outlet of the outer cylinder faces downwards along the oblique direction.

3. The coal slurry reclaimer of claim 2,

the included angle between the central axis of the outer cylinder and the horizontal plane is 20-45 degrees.

4. A coal slurry preparation system comprising the coal slurry recoverer of any one of claims 1-3, the coal slurry preparation system further comprising a coal mill, a trommel and a water inlet manifold, the coal mill having a feed inlet and a discharge outlet, the trommel having a slurry inlet, a slurry outlet and an overflow outlet, the discharge outlet of the coal mill communicating with the slurry inlet of the trommel, the overflow outlet communicating with the slurry inlet pipe of the coal slurry recoverer; a feed inlet of the coal mill is connected with a feed pipe;

three branch pipes are led out from the water inlet main pipe and are respectively a first branch pipe, a second branch pipe and a third branch pipe, wherein the first branch pipe is communicated with a water inlet of the coal slurry recoverer, the second branch pipe is communicated with a flushing hole of the coal slurry recoverer, the third branch pipe is led out of a coal grinding water pipe and a cleaning water pipe, the coal grinding water pipe is communicated with a coal pulverizer, and the cleaning water pipe is communicated with a feeding pipe; the water outlet of the coal slurry recoverer is communicated with a coal mill through a water return pipe.

5. The coal slurry preparation system of claim 4, wherein a drain is provided at the lowest point of the return pipe, and a drain valve is installed on the drain.

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