CN219400528U - Coarse clean coal ash-reducing dehydration system - Google Patents
Coarse clean coal ash-reducing dehydration system Download PDFInfo
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- CN219400528U CN219400528U CN202320601547.1U CN202320601547U CN219400528U CN 219400528 U CN219400528 U CN 219400528U CN 202320601547 U CN202320601547 U CN 202320601547U CN 219400528 U CN219400528 U CN 219400528U
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Abstract
The utility model provides a coarse clean coal ash-reducing dehydration system, which comprises a TBS separator, a first section of coarse-cutting arc screen and a second section of water-discharging arc screen which are sequentially connected, wherein a screen-upper material outlet of the first section of coarse-cutting arc screen is connected with a lump coal dehydration system, a centrifugal liquid outlet of the lump coal dehydration system and a screen-upper material outlet of the second section of water-discharging arc screen are both connected with a lean magnetic tail bucket, and the lean magnetic tail bucket is connected with a lean cyclone; the underflow outlet of the lean cyclone is connected with the three-section laminated screen, the overflow outlet of the lean cyclone, the undersize outlet of the three-section laminated screen and the undersize outlet of the two-section draining arc screen are connected with a flotation machine, the flotation machine is connected with a filtering mechanism, and the oversize outlets of the three-section laminated screen are respectively connected with a lump coal dewatering system and the filtering mechanism. The utility model provides a coarse clean coal ash-reducing dehydration system, which improves the ash-reducing dehydration effect, shortens the process flow, reduces the number of equipment and greatly reduces the production cost of ton coal.
Description
Technical Field
The utility model relates to the technical field of coal dressing, in particular to a coarse clean coal ash-reducing dehydration system.
Background
In the coarse clean coal ash-reducing dehydration system in the prior art, as shown in figure 1, an oversize product outlet of a medium-removing sieve is connected with a lump coal dehydration system (four horizontal vibration unloading centrifuges), and an undersize product outlet is connected with a magnetic separator; the overflow port of the TBS separator is connected with two-section laminated sieves (screen gaps of 0.35mm and four screen gaps), and the oversize material outlet of the two-section laminated sieves is connected with a horizontal scraper discharge centrifuge (two screen gaps); the non-magnetic material outlet of the magnetic separator, the centrifugal liquid outlet of the horizontal vibration discharge centrifuge and the centrifugal liquid outlet of the horizontal scraper discharge centrifuge are connected with the lean magnetic tail bucket.
The device comprises a lean magnetic tail barrel, a lean cyclone, an arc screen (screen gap 0.75 mm) and a linear vibrating screen (screen gap 0.50 mm), wherein a screen upper material outlet of the linear vibrating screen is connected with a vertical scraper discharging centrifuge (one), a centrifugal liquid outlet of the vertical scraper discharging centrifuge is connected with the lean magnetic tail barrel, and fine material outlets of the lean cyclone, the arc screen and the linear vibrating screen are connected with a flotation machine; the flotation machine is connected with the filtering dehydrator.
The total clean coal product obtained by the coarse clean coal dehydration system consists of a heavy medium block clean coal product, a fine magnetic tail coarse clean coal, TBS coarse clean coal and a floatation clean coal product, and the target moisture of the total clean coal product is 13%. However, the coarse clean coal dehydration system runs for a long time under full load, so that the moisture of the coarse clean coal product exceeds the standard, and the moisture of the total clean coal product is higher than the target moisture by 0.23%; in the underflow product of the lean cyclone, the content of the +0.5mm grade material is more than 60 percent, the content of the-0.125 mm grade material is more than 14 percent, and the problem that the underflow clamp is more serious exists; the total ash content of the oversize material of the two-section laminated screen is about 12%, and the ash removing effect is poor.
Disclosure of Invention
The utility model provides a coarse clean coal ash-reducing dehydration system, which improves the ash-reducing dehydration effect, shortens the process flow, reduces the number of equipment and greatly reduces the production cost of ton coal.
The technical scheme of the utility model is realized as follows: the coarse clean coal ash-reducing dehydration system comprises a TBS separator, a first section of coarse-cutting arc sieve and a second section of water-discharging arc sieve which are sequentially connected, wherein a screen material outlet of the first section of coarse-cutting arc sieve is connected with a lump coal dehydration system, a centrifugal liquid outlet of the lump coal dehydration system and a screen material outlet of the second section of water-discharging arc sieve are both connected with a lean magnetic tail bucket, and the lean magnetic tail bucket is connected with a lean cyclone; the underflow outlet of the lean cyclone is connected with the three-section laminated screen, the overflow outlet of the lean cyclone, the undersize outlet of the three-section laminated screen and the undersize outlet of the two-section draining arc screen are connected with a flotation machine, the flotation machine is connected with a filtering mechanism, and the oversize outlets of the three-section laminated screen are respectively connected with a lump coal dewatering system and the filtering mechanism. The oversize material outlet of the two-stage drainage arc-shaped sieve is connected with the lean magnetic tail barrel, so that the concentration of the lean medium magnetic tail of the lean coal is improved, and the feeding concentration of the lean cyclone is ensured.
Further, the device also comprises a medium removing sieve, wherein a screen upper outlet of the medium removing sieve is connected with a lump coal dehydration system, a screen lower outlet of the medium removing sieve is connected with a magnetic separator, and a non-magnetic outlet of the magnetic separator is connected with a lean magnetic tail barrel.
Further, the lump coal dehydration system comprises a horizontal vibration unloading centrifuge.
Further, a filtrate outlet of the filtering mechanism is connected with a flotation machine.
Further, the filtering mechanism comprises a pressure filter and a wind-through filter press which are connected in sequence.
Further, the three-section laminated screen comprises a plurality of laminated screens, each layer comprises a first section screen, a second section screen and a third section screen, a pulp mixing groove is arranged between the first section screen and the second section screen, and high-pressure water spraying pipes are arranged on the screen surfaces of the second section screen and the third section screen; the fine-grain high ash on the surface of the coarse particles is further diluted and washed by arranging a slurry mixing tank; through setting up high-pressure spray pipe, wash the washing to granule surface, reduce the absorption of high ash of fine grain level to coarse grain clean coal.
The utility model has the beneficial effects that:
according to the utility model, through the arrangement of a section of coarse cutting arc screen, +0.5mm particle diameter coarse cutting recovery is carried out on overflow products separated by a TBS separator, +0.5mm particle diameter products and lump clean coal are combined for dehydration, and-0.5mm particle diameter products are classified by a two-section drainage arc screen, and-0.25 mm particle diameter products enter flotation; the product with the particle diameter of +0.25mm is combined with the magnetic tail of the lean medium of the clean coal, so that the feeding concentration of the lean cyclone is ensured, and the problem of serious bottom flow clamping is solved.
The oversize material outlet of the three-section laminated screen is respectively connected with a lump coal dehydrator and a filtering mechanism, so that a part of fine-fraction coarse refined coal slime is used as a coarse material to enter flotation coarse refined coal, coarse particles of coarse refined coal slime form a framework on a filter cake to form a loose filter cake, and the damping of the filter cake is reduced, so that the efficiency of the flotation fine dehydration equipment is improved; and the other part of redundant fine-fraction coarse refined coal slime is led to a lump coal dehydration system, and the lump coal is used as a framework to improve the dehydration effect of the fine-fraction coarse refined coal slime.
Compared with the prior art, the utility model omits a horizontal scraper discharge centrifuge (two) and a vertical scraper discharge centrifuge (one), shortens the process flow and reduces the number of equipment; the total clean coal moisture is reduced, the problems of bottom flow clamping and sieve seam blocking are effectively solved, the overhaul and maintenance cost is greatly reduced, and the production cost of ton coal is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a coarse clean coal ash-reducing and dewatering system in the prior art;
FIG. 2 is a schematic diagram of the ash-reducing and dewatering system for coarse and refined coal of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 2, the coarse clean coal ash-reducing and dewatering system comprises a TBS separator, a first section of coarse cutting arc screen and a second section of draining arc screen which are connected in sequence. The first section of thick sieve bend is a vibrating sieve bend with a sieve gap of 0.75mm, and the second section of water draining sieve bend is a vibrating sieve bend with a sieve gap of 0.35mm. The oversize material outlet of the one-section rough cutting arc screen is connected with a lump coal dehydration system, and the lump coal dehydration system adopts a horizontal vibration unloading centrifuge.
The system also comprises a medium removing sieve, wherein an oversize product outlet of the medium removing sieve is connected with the lump coal dehydration system, an undersize product outlet of the medium removing sieve is connected with the magnetic separator, a non-magnetic product outlet of the magnetic separator, a centrifugal liquid outlet of the lump coal dehydration system and an oversize product outlet of the two-section drainage arc sieve are connected with the lean magnetic tail bucket, and the lean magnetic tail bucket is connected with the lean cyclone.
The underflow outlet of the lean cyclone is connected with the three-section laminated screen, the overflow outlet of the lean cyclone, the undersize outlet of the three-section laminated screen and the undersize outlet of the two-section drainage arc screen are connected with the flotation machine, the flotation machine is connected with the filtering mechanism, the filtering mechanism comprises a pressure filter and a wind-through filter press which are sequentially connected, the filtrate outlet of the filtering mechanism is connected with the flotation machine, and the oversize outlet of the three-section laminated screen is respectively connected with the lump coal dewatering system and the filtering mechanism.
The three-section laminated screen comprises five parallel laminated screens, each layer comprises a first section screen, a second section screen and a third section screen, a flexible polyurethane screen with a screen gap of 0.35mm is adopted, a slurry mixing groove is arranged between the first section screen and the second section screen, and high-pressure water spraying pipes are arranged on the screen surfaces of the second section screen and the third section screen. The three-section laminated screen is a high-frequency vibration fine screen, and the model is ZKJ-1007D5/3.
The application method of the coarse clean coal ash-reducing dehydration system comprises the following steps:
(1) Raw coal is subjected to desliming and desliming by a desliming screen to obtain oversize block raw coal and undersize coal slime, the oversize block raw coal is subjected to dense medium coal dressing-medium removal screening to obtain a clean coal medium-removal oversize product and a clean coal medium-removal undersize product, and the clean coal medium-removal undersize product is subjected to magnetic separator to recover magnet mineral powder to obtain clean coal thin medium magnetic tail;
classifying the undersize coal slime by a classifying cyclone, and separating by a TBS separator to obtain TBS overflow clean coal; the TBS overflow clean coal product is subjected to a one-section rough cutting arc screen to obtain a +0.5mm particle size product and a-0.5mm particle size product, the +0.5mm particle size product and the clean coal medium removal oversize product are combined, and then the mixture enters a horizontal vibration discharge centrifuge for dehydration recovery to obtain a heavy medium block clean coal product and centrifugate;
(2) The product with the grain size of 0.5mm enters a two-stage draining arc sieve to obtain a product with the grain size of +0.25mm and a product with the grain size of 0.25mm, the product with the grain size of +0.25mm, the centrifugal liquid in the step (1) and the magnetic tail of the lean medium of clean coal enter a lean magnetic tail barrel, and then the product is classified by a lean cyclone to obtain a classified underflow product and a classified overflow product;
(3) The graded underflow product in the step (2) enters a three-section laminated screen to obtain oversize products and undersize products, and the undersize products, the-0.25 mm particle size product in the step (2) and the graded overflow product enter a flotation machine to obtain flotation clean coal;
(4) And (3) introducing one part of the oversize material in the step (3) to a horizontal vibration unloading centrifuge for dehydration, merging the other part of the oversize material with the flotation clean coal in the step (3), and feeding the mixed material into a filtering dehydrator to obtain a flotation clean coal product, and returning filtrate obtained in the filtering dehydrator to the flotation machine.
The heavy medium block clean coal product and the flotation clean coal product form total clean coal, the moisture content of the total clean coal is 12.79 percent and is lower than the target moisture by 13 percent, and the phenomenon of exceeding the moisture of the clean coal is reduced; in the classified underflow product of the lean cyclone, the content of the +0.5mm size fraction material is 48.67 percent, the content of the-0.125 mm size fraction material is 6.10 percent, and the condition of adding the base material is obviously improved; the total ash content of the oversize material of the three-section laminated screen is 9.97%, and the desliming effect is improved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The coarse clean coal ash-reducing dehydration system is characterized by comprising a TBS separator, a first section of coarse cutting arc screen and a second section of draining arc screen which are sequentially connected, wherein a screen material outlet of the first section of coarse cutting arc screen is connected with a lump coal dehydration system, a centrifugal liquid outlet of the lump coal dehydration system and a screen material outlet of the second section of draining arc screen are connected with a lean magnetic tail bucket, and the lean magnetic tail bucket is connected with a lean cyclone; the underflow outlet of the lean cyclone is connected with the three-section laminated screen, the overflow outlet of the lean cyclone, the undersize outlet of the three-section laminated screen and the undersize outlet of the two-section draining arc screen are connected with a flotation machine, the flotation machine is connected with a filtering mechanism, and the oversize outlets of the three-section laminated screen are respectively connected with a lump coal dewatering system and the filtering mechanism.
2. The coarse clean coal ash-reducing and dewatering system according to claim 1, further comprising a medium-removing sieve, wherein an oversize product outlet of the medium-removing sieve is connected with the lump coal dewatering system, an undersize product outlet of the medium-removing sieve is connected with a magnetic separator, and a non-magnetic product outlet of the magnetic separator is connected with the lean magnetic tail bucket.
3. A coarse clean coal ash reduction dewatering system as claimed in claim 1 or 2, wherein the lump coal dewatering system comprises a horizontal vibrating discharge centrifuge.
4. The coarse clean coal ash-reducing dewatering system of claim 1, wherein the filtrate outlet of the filtering mechanism is connected to a flotation machine.
5. A coarse clean coal ash reducing and dewatering system according to claim 1 or 4, wherein the filtering mechanism comprises a pressure filter and a wind-through filter press which are connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320601547.1U CN219400528U (en) | 2023-03-24 | 2023-03-24 | Coarse clean coal ash-reducing dehydration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320601547.1U CN219400528U (en) | 2023-03-24 | 2023-03-24 | Coarse clean coal ash-reducing dehydration system |
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| CN219400528U true CN219400528U (en) | 2023-07-25 |
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| CN202320601547.1U Active CN219400528U (en) | 2023-03-24 | 2023-03-24 | Coarse clean coal ash-reducing dehydration system |
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