CN111909749A - Underground crude coal dehydration treatment process - Google Patents
Underground crude coal dehydration treatment process Download PDFInfo
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- CN111909749A CN111909749A CN202010711976.5A CN202010711976A CN111909749A CN 111909749 A CN111909749 A CN 111909749A CN 202010711976 A CN202010711976 A CN 202010711976A CN 111909749 A CN111909749 A CN 111909749A
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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Abstract
A kind of DH crude coal dehydration treatment process, the crude coal is graded by the first-class linear vibrating screen, the oversize supplies are sent into the coal bunker of shaft bottom, the undersize slack coal is and after the second-class linear vibrating screen and dehydration, the oversize supplies are sent into the coal bunker of shaft bottom; after the undersize coal slime is dehydrated by a three-level vibrating sieve bend and a three-level high-frequency sieve, the material with the grain diameter larger than 0.5mm is sent to a shaft bottom coal bunker, the undersize coal slime is concentrated and precipitated by an inclined plate high-efficiency thickener, the fine coal slime returns to the raw coal after the bottom flow is recovered by a filter press, and the overflow after the concentration and precipitation enters a water bunker to realize the graded recovery of the coal slime. After the treatment by the method, the coal water system realizes the closed circuit of coal and water separation, the raw coal adopts a three-stage dehydration, deep cone inclined plate concentration and filter pressing combined process, the dehydrated coal and coal slime directly return to a coal flow system without falling to the ground, and the filtrate water is separated and discharged into a water bin.
Description
Technical Field
The invention belongs to the technical field of underground coal mine crude coal dehydration treatment, and particularly relates to an underground crude coal dehydration treatment process.
Background
With the continuous development of social economy and scientific technology, coal is still the first major energy source in China, and with the increase of mining depth and the advance of large-scale mine mining work, the influence of water burst in an underground coal mine on mining production is more and more concerned. From the current condition of the domestic underground raw coal dehydration system, the design is mainly matched with a hydraulic coal mining process, the dehydration and recovery of coal slime in a mining area are realized, coal water is completely recycled in a closed loop after being purified in the mining area, and a coal water lifting system and a ground dehydration system are thoroughly cancelled, so that the cyclic utilization of the water is improved on one hand, and the phenomena of sliding down and cargo running of the raw coal in the transportation process and tank mouth blockage during the cargo discharge are reduced after the moisture of the raw coal is reduced on the other hand. The transportation capacity and the yield of the raw coal are improved, better economic benefit is obtained, and the labor intensity of workers is reduced.
Aiming at the fully mechanized mining process, an underground raw coal dehydration system is put into use under a plurality of coal mines, such as Bayanghei coal mine, Jining coal mine and Mengke Qing coal mine, etc., research shows that most coal mines do not design a fine coal slime water separation and recovery process, coal slime water needs to be manually cleaned after natural precipitation, natural precipitation needs a large-area goaf, time and labor are consumed, a large amount of space is consumed, closed circulation of the coal slime water is not realized, and great potential safety hazards exist along with the increase of water volume during mining. Therefore, it is necessary to develop a new type of underground coal water separation treatment process aiming at the above disadvantages.
Disclosure of Invention
In view of the problems of the existing underground raw coal water, the invention aims to provide an underground raw coal dehydration treatment process, which is used for effectively solving the problems in the prior art, in particular to the problems of difficult treatment, long time, large occupied area and high treatment cost of fine coal slime.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of DH crude coal dehydration treatment process, the crude coal is graded by the first-class linear vibrating screen, the oversize supplies are sent into the coal bunker of shaft bottom, the undersize slack coal is and after the second-class linear vibrating screen and dehydration, the oversize supplies are sent into the coal bunker of shaft bottom; after the undersize coal slime is dehydrated by a three-level vibrating sieve bend and a three-level high-frequency sieve, the material with the grain diameter larger than 0.5mm is sent to a shaft bottom coal bunker, the undersize coal slime is concentrated and precipitated by an inclined plate high-efficiency thickener, the fine coal slime returns to the raw coal after the bottom flow is recovered by a filter press, and the overflow after the concentration and precipitation enters a water bunker to realize the graded recovery of the coal slime.
The invention is further improved in that the first-stage grading dewatering screen is a linear vibrating screen and adopts a bar-type screen plate.
The invention has the further improvement that the vibration mode of the primary grading dewatering screen is a vibration exciter, the vibration exciting acceleration is more than or equal to 4g, and the double amplitude is 9-12 mm.
The invention has the further improvement that the secondary grading dewatering screen is a linear vibrating screen and adopts a stainless steel strip seam screen plate.
The further improvement of the invention is that the double amplitude of the secondary grading dewatering screen is 9-12 mm.
The invention has the further improvement that the feed particle size of the inclined plate high-efficiency thickener is 0-0.35 mm, and the underflow concentration is 150-300 g/L.
A further development of the invention is that the filter press is a plate and frame filter press.
The further improvement of the invention is that the material feeding concentration of the plate-and-frame filter press is 150-300g/L, the rated feeding pressure is 0.6-0.8 MPa, and the working pressure of the oil cylinder is less than or equal to 20 MPa.
Compared with the prior art, the invention has the following beneficial effects:
1. the system realizes the closed circuit of coal and water separation, the raw coal adopts a three-stage dehydration, deep cone inclined plate concentration and filter pressing combined process, the dehydrated coal and coal slime do not fall to the ground and directly return to a coal flow system, and filtrate water is separated and discharged into a water sump.
2. Three-stage dehydration is adopted, the acceleration of the first-stage dehydration sieve and the second-stage dehydration sieve is more than or equal to 4G, the dehydration efficiency is high, the three-stage dehydration is adopted, the first-stage dehydration is 25mm (adjustable) classification dehydration, the second-stage dehydration is 1mm (adjustable) classification dehydration, the third-stage dehydration is 0.5mm classification dehydration, and the slime water is treated by sedimentation and filter pressing.
3. Because the moisture content in the raw coal is different in size, the water amount after primary and secondary dehydration is unstable, and the vibrating sieve bend and the high-frequency sieve are adopted for tertiary dehydration, so that the sieve bend and the high-frequency sieve can be ensured to respectively play a dehydration role, and the moisture stability of the coarse coal slime with the particle size of 1.0(1.5) -0.5mm is ensured.
4. The slime water is settled without adding chemicals, so that the influence on subsequent links is reduced, and the settling effect is ensured by adopting an inclined plate deep cone settling process.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a process flow diagram for the separation of coal water according to the present invention;
reference numerals: 1-first-stage linear vibrating screen, 2-second-stage linear vibrating screen, 3-third-stage vibrating sieve bend, 4-third-stage high-frequency screen, 5-inclined plate high-efficiency thickener and 6-filter press.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1, the process of the present invention is specifically as follows:
after the raw coal is graded by a primary linear vibrating screen 1 (adjustable by 25 mm), the +25mm material is directly sent into a shaft bottom coal bunker as raw coal, and the minus 25mm undersize slack coal is dehydrated by a secondary linear vibrating screen 2 and (adjustable by 1 mm), and then is directly connected into the shaft bottom coal bunker on the screen; after the undersize slime water is further dehydrated by a three-level vibrating sieve 3 and a three-level high-frequency sieve 4, the plus 0.5mm material is directly sent to a shaft bottom coal bunker as raw coal, the undersize slime water is concentrated and precipitated by an inclined plate high-efficiency concentrator 5, the underflow is recovered by a filter press 6, the fine slime returns to the raw coal by a transfer belt conveyor, the overflow after the concentration and precipitation and the filtrate of the filter press are pumped together and automatically flow to a sump, and the graded recovery of the system slime is realized. The specific process is as follows:
(1) after the raw coal is graded by 25mm (adjustable), the +25mm material is directly used as raw coal, the minus 25mm minus sieve slack coal is dehydrated by 1mm (adjustable), and the raw coal is directly put on the sieve;
(2) concentrating and grading the undersize coal slime, recovering coarse coal slime through a high-frequency sieve, and then putting the coarse coal slime into raw coal, wherein the inclined plate high-efficiency thickener overflows and the undersize water of the high-frequency sieve enters into a concentration sediment;
(3) the bottom flow is recovered by a filter press, and then the fine coal slime returns to the raw coal by a transfer belt conveyor;
(4) and the overflow after concentration and precipitation and the filtrate of the filter press are pumped and automatically flow to a sump together, so that the coal slime of the system is recycled in a grading manner.
In the step (1), a two-stage dewatering screen is adopted, wherein the first-stage grading dewatering screen is a linear vibrating screen, a bar-type screen plate with the thickness of 25-50 mm is selected, the phenomenon that the screen hole is blocked by materials is reduced, the vibration mode is a vibration exciter, the vibration exciting acceleration is more than or equal to 4g, the double amplitude is 9-12 mm, the second-stage grading dewatering screen is a linear vibrating screen, a wear-resistant stainless steel bar seam screen plate with the thickness of 1-1.5 mm is selected, and the double amplitude is 9-12 mm;
the step (2) is a three-stage classification dehydration, which consists of an arc screen and a high-frequency screen, wherein the arc screen is a vibrating arc screen; an inclined plate high-efficiency concentrator, the feed particle size is 0-0.35 mm, the underflow concentration is 150-300g/L,
in the step (3), the filter press is a plate-and-frame filter press, the feed concentration is 150-300g/L, the rated feed pressure is 0.6-0.8 MPa, the working pressure of the oil cylinder is less than or equal to 20MPa, the unloading mode is segmented pulling, and the feed mode is two-end feed.
Description of main apparatus operation:
(1) first-stage grading dewatering screen
The first-level grading dewatering screen is a linear vibrating screen, the inclination angle of the screen surface of the screening machine is 30 degrees, the throughput Q is 3400t/h, a 25mm (adjustable) bar type screen plate is selected, the phenomenon that the screen holes are blocked by materials is reduced, the vibration mode is a vibration exciter, the vibration exciting acceleration is more than or equal to 4g, and the double amplitude is 9-12 mm.
(2) Two-stage grading dewatering screen
The secondary grading dewatering screen is a linear vibrating screen, the inclination angle of the screen surface of the screening machine is 10 degrees, the throughput Q is 1000t/h, a 1-1.5 mm wear-resistant stainless steel strip seam screen plate and a polyurethane frame are selected, and the double amplitude is 9-12 mm.
(3) Three-stage grading dewatering screen
The three-stage grading dewatering screen consists of an arc screen and a high-frequency screen. The sieve bend is a vibrating sieve bend: the width of the vibrating arc-shaped screen surface: 1600mm, radius of curvature of the sieve surface: 2032mm, cut-off particle size +0.35mm, and sievingWrapping the corner: 45 degrees, a stainless steel wedge-shaped sieve bar welding structure, and the back width of 2.2 mm; q is more than or equal to 200m3And h, seat type installation and support.
High-frequency screening: the size of the screen surface is 1.8m multiplied by 4.8m, and the number of the screen surface layers is as follows: layer 1, screen surface angle: -5 °, processing power: q is 40t/h (drier), polyurethane frame stainless steel strip seam sieve, and hierarchical granularity 0.5mm, vibration frequency 25Hz, the sieve frame is the seat formula installation, the vibration mode: the vibration exciter is a rubber spiral composite spring for vibration reduction.
(4) Filter press
The feed concentration is 150-300g/L, the single-station processing capacity is 10t/h, the rated feed pressure is 0.6-0.8 MPa, the working pressure of the oil cylinder is less than or equal to 20MPa, the unloading mode is segmented pulling, and the feeding mode is two-end feeding.
(5) Inclined plate thickener
The feed granularity is less than 0.35mm, the underflow concentration is 150-300g/L, a feed buffer device is arranged, the slime water is stably fed by a tangent line, the motion track of solid-liquid separation from the center to the peripheral overflow groove is in a curve shape, the solid-liquid separation is accelerated by an arranged inclined plate, the rotation and rake lifting of the thickener are respectively completed by a rotation rake lifting device, and when the torsion exceeds a set value, the rake frame can be automatically lifted. The processing capacity of a single thickener is 60-100 m3/h。
After the treatment by the method, according to the field sampling assay analysis and the actual use effect, the moisture of the raw coal is below 15 percent before the raw coal enters the sieve, and the moisture of the dehydrated raw coal is below 13.4 percent, so that the moisture of nearly 1.5 percent can be removed. When the moisture of the raw coal is more than 15% before the raw coal enters the sieve, the moisture of the raw coal can be controlled within 15.0% after dehydration. That is to say, no matter how high the water content of the coal is, the total water content of the raw coal can be basically controlled to be about 15% after the raw coal passes through the raw coal dehydration system, and the expected effect is achieved. The results of the measurements before and after dehydration are shown in Table 1 below.
TABLE 1 examination results before and after dehydration
The invention has the following advantages:
1) the system realizes coal closed circuit and water separation;
the crude coal dehydration system is completely embedded into the original underground transportation system, the control of the primary and secondary dehydration devices is embedded into the original control system, the primary and secondary dehydration devices and the original devices form a mutual locking relation, and the tertiary dehydration and coal slime water mutual control system is separated from the original transportation system.
2) Three-stage dehydration is adopted, the acceleration of the first-stage dehydration screen and the second-stage dehydration screen is more than or equal to 4G, and the dehydration efficiency is high.
Three-stage dehydration is adopted, wherein the first stage is 25mm (adjustable) stage dehydration, the second stage is 1mm (adjustable) stage dehydration, the third stage is 0.5mm stage dehydration, and slime water is treated by sedimentation and filter pressing. The vibration source of the first-stage and second-stage grading dewatering screens adopts a vibration exciter, the vibration exciting acceleration of the vibration exciter is close to 5G, so that the coal flow is forced to be thrown upwards when passing through the screening machine, materials are loose in the ascending process, the coal and the water in the coal flow can be layered at the moment, the operation is repeated, and the water in the coal flow can be forced to be separated from the coal and passes through the screen plate to be separated from the undersize. If the forced vibration separation is not carried out, only the water in the lower layer of the coal flow is separated, the water in the middle and upper layers cannot be separated, and the dehydration effect is poor.
3) The maximum processing capacity of the system is 3400t/h, and the system is simple and smooth, and has high automation program: due to the limitation of underground space, the maximum size of the screen machine can only be 2600 multiplied by 4800mm, the incoming material speed is 4m/s, and the normal processing capacity can be guaranteed to be 2500-3400 t/h when the inclination angle of the screen surface of the screen moving screen is at least 30 degrees through calculation.
4) Arc-shaped screen and high-frequency screen for three-stage dehydration
Because the moisture content in the raw coal is different in size, the water amount after primary and secondary dehydration is unstable, and the vibrating sieve bend and the high-frequency sieve are adopted for tertiary dehydration, so that the sieve bend and the high-frequency sieve can be ensured to respectively play a dehydration role, and the moisture stability of the coarse coal slime with the particle size of 1.0(1.5) -0.5mm is ensured.
5) The slime water is settled without adding chemicals, so that the influence on subsequent links is reduced
Because the coal slime is primary coal slime, and simultaneously, the treated coal slime is mixed back to a crude coal system and cannot influence each link of storage and washing in a coal preparation plant, the coal slime water cannot be added with chemicals after sedimentation, and an inclined plate deep cone sedimentation process is adopted for ensuring the sedimentation effect.
6) When the crude coal does not need to be dehydrated, the system takes care of the sludge treatment of the underground sump
When the moisture of the raw coal is small, the coal slime water in the central water sump can be conveyed to a coal slime water system through a pump for treatment, on one hand, the cost of the clean water sump can be reduced, on the other hand, the service cycle of the water sump can be prolonged, and on the other hand, the moisture of the coal slime in the water sump treated by the traditional mode can be reduced.
7) The system does not influence the arrangement of the east wing adhesive tape machine in the later stage: the functions of the east wing and the west wing are not changed during transportation and crushing.
8) Stabilizing moisture of the raw coal: according to the tracking detection of more than one year, the system can stabilize the moisture of the raw coal to be about 15% no matter how large the moisture of the coal is.
Claims (8)
1. A process for dewatering underground raw coal is characterized in that after the raw coal is classified by a primary linear vibrating screen (1), oversize materials are sent to a shaft bottom coal bunker, and undersize slack coal is dewatered by a secondary linear vibrating screen (2), and the oversize materials are sent to the shaft bottom coal bunker; after the undersize coal slime is dehydrated by a three-level vibrating arc screen (3) and a three-level high-frequency screen (4), materials with the particle size larger than 0.5mm are sent to a shaft bottom coal bunker, the undersize coal slime is concentrated and precipitated by an inclined plate high-efficiency concentrator (5), fine coal slime returns to raw coal after underflow is recovered by a filter press (6), and overflow after concentration and precipitation enters a water bunker to realize graded recovery of the coal slime.
2. The underground raw coal dehydration treatment process according to claim 1, characterized in that the primary classification dehydration screen (1) is a linear vibrating screen, and a bar-type screen plate is adopted.
3. The underground raw coal dehydration treatment process according to claim 1 or 2, characterized in that the vibration mode of the primary grading dehydration screen (1) is a vibration exciter, the excitation acceleration is not less than 4g, and the double amplitude is 9-12 mm.
4. The underground raw coal dehydration treatment process according to claim 1, characterized in that the secondary classification dehydration screen (2) is a linear vibrating screen, and a stainless steel strip seam screen plate is adopted.
5. The underground raw coal dehydration treatment process according to claim 1 or 4, characterized in that the double amplitude of the secondary grading dehydration screen (2) is 9-12 mm.
6. The underground raw coal dehydration treatment process as claimed in claim 1, wherein the particle size of the fed material of the inclined plate high efficiency thickener is 0-0.35 mm, and the underflow concentration is 150-300 g/L.
7. The underground raw coal dehydration treatment process according to claim 1, characterized in that the filter press is a plate and frame filter press.
8. The underground raw coal dehydration treatment process as claimed in claim 7, wherein the feed concentration of the plate and frame filter press is 150-300g/L, the rated feed pressure is 0.6-0.8 MPa, and the working pressure of the oil cylinder is less than or equal to 20 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010711976.5A CN111909749A (en) | 2020-07-22 | 2020-07-22 | Underground crude coal dehydration treatment process |
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| CN202010711976.5A CN111909749A (en) | 2020-07-22 | 2020-07-22 | Underground crude coal dehydration treatment process |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711929A (en) * | 2009-11-25 | 2010-05-26 | 煤炭科学研究总院唐山研究院 | Process for fully dehydrating coal under hydraulic coal mining well |
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- 2020-07-22 CN CN202010711976.5A patent/CN111909749A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711929A (en) * | 2009-11-25 | 2010-05-26 | 煤炭科学研究总院唐山研究院 | Process for fully dehydrating coal under hydraulic coal mining well |
Non-Patent Citations (1)
| Title |
|---|
| 朱银昌等: "《复杂•难采煤层的开采》", 31 January 1998, 世界图书出版公司北京公司 * |
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Inventor after: Shi Yuanteng Inventor after: Yao Guanghua Inventor after: Dong Baoguang Inventor after: Zhao Zemeng Inventor after: Wang Shuai Inventor after: Li Ruihua Inventor after: Li Qing Inventor before: Shi Yuanteng Inventor before: Dong Baoguang Inventor before: Zhao Zemeng Inventor before: Wang Shuai Inventor before: Li Ruihua Inventor before: Li Qing |
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Effective date of registration: 20210114 Address after: 710003 2nd floor, Zhongmei energy building, No.66, North Yanta Road, Beilin District, Xi'an City, Shaanxi Province Applicant after: CHINA COAL ENERGY RESEARCH INSTITUTE Co.,Ltd. Applicant after: ERDOS YIHUA MINERAL RESOURCES Co.,Ltd. Address before: 710003 2nd floor, Zhongmei energy building, No.66, North Yanta Road, Beilin District, Xi'an City, Shaanxi Province Applicant before: CHINA COAL ENERGY RESEARCH INSTITUTE Co.,Ltd. |
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Application publication date: 20201110 |