CN114535094A - Method and system for comprehensively sorting and upgrading low-quality coal - Google Patents
Method and system for comprehensively sorting and upgrading low-quality coal Download PDFInfo
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- CN114535094A CN114535094A CN202210150684.8A CN202210150684A CN114535094A CN 114535094 A CN114535094 A CN 114535094A CN 202210150684 A CN202210150684 A CN 202210150684A CN 114535094 A CN114535094 A CN 114535094A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
A method and a system for integrated separation and upgrading of low quality coal, the method comprising: (1) the fed raw coal is sequentially sieved by three levels of 50mm, 13mm and 3/6mm to obtain graded materials with the grain diameters of more than 50mm, 13-50mm and 3/6-13mm and slack coal with the grain diameter of less than 3/6 mm; (2) carrying out photoelectric separation on the classified materials with the particle size larger than 50mm to obtain first clean coal; (3) performing dry separation on the classified material with the particle size of 13-50mm to obtain second clean coal; (4) dry sorting the classified material with the particle size of 3/6-13mm to obtain third clean coal; (5) and (5) coal blending treatment. The system comprises a grading sieve, a photoelectric separator, a first/second combined dry separator and coal blending equipment. The method and the system can realize comprehensive separation and quality improvement of low-quality coal.
Description
Technical Field
The invention belongs to the field of coal preparation, and particularly relates to a method and a system for comprehensively separating and upgrading low-quality coal.
Background
Coal, as the most main basic energy in China, will occupy the status of the main energy in China for a long time, and provide guarantee for the high-speed development of the economy in China. China has abundant coal resources, but the quality of coal is poor, and the low-quality coal resources account for about 40 percent of the total amount of the coal resources in China. Because most of coal is distributed in arid water-deficient areas and the coal quality of the coal is poor, the traditional wet separation technology is greatly limited, and the problem cannot be effectively solved. The existing low-quality coal separation technology is only limited to the improvement of the quality of coal, and has less attention to the requirements of users. In the coal separation, the high-efficiency process for comprehensively improving the quality of low-quality coal can be developed only by comprehensively considering the properties of raw coal and the requirements of users and reasonably adjusting the product structure.
Disclosure of Invention
The first purpose of the invention is to provide a method for comprehensively sorting and upgrading low-quality coal, which can realize comprehensive sorting and upgrading of the low-quality coal and has high upgrading efficiency;
the second purpose of the invention is to provide a system for comprehensively sorting and upgrading low-quality coal by using the method, which has a simple structure and high upgrading efficiency.
In order to achieve the first purpose of the invention, the following technical scheme is adopted:
a method for comprehensively sorting and upgrading low-quality coal comprises the following steps:
(1) carrying out three-stage screening of 50mm, 13mm and 3/6mm on the fed raw coal in sequence to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
(2) performing photoelectric separation on the classified material with the particle size larger than 50mm obtained in the step (1) to obtain first clean coal and first gangue;
(3) performing dry separation on the classified material with the particle size of 13-50mm obtained in the step (1) to obtain second clean coal and second gangue;
(4) carrying out dry separation on the classified material with the particle size of 3/6-13mm obtained in the step (1) to obtain third clean coal and third gangue;
(5) carrying out coal blending treatment to obtain a coal blending product; wherein, the coal blending treatment is to mix and blend coal by adopting any 2 or more of the following materials:
firstly, obtaining slack coal in the step (1);
② the first clean coal obtained in the step (2);
thirdly, second clean coal obtained in the step (3);
fourthly, the third clean coal obtained in the step (4).
Preferably, the classified material with the particle size of 3/6-13mm obtained in the step (1) is dried to the external water content of less than 12 wt% before being subjected to the dry sorting in the step (4); or
The classified material with the particle size of 3/6-13mm obtained in the step (1) is subjected to external water content measurement before being subjected to dry separation in the step (4); if the external water content is more than or equal to 12 wt%, drying the mixture until the external water content is less than 12 wt%; and (4) directly carrying out dry sorting in the step (4) if the external water content is less than 12 wt%.
Preferably, the third clean coal obtained in the step (4) is dried before being used for the coal blending treatment in the step (5) until the calorific value is more than or equal to 3500 kcal/kg; or
Measuring the calorific value of the third clean coal obtained in the step (4) before the third clean coal is used for the coal blending treatment in the step (5); if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
Preferably, before the slack coal obtained in the step (1) is used for the coal blending treatment in the step (5), drying treatment is carried out to ensure that the calorific value is more than or equal to 3500 kcal/kg; or
Before the slack coal obtained in the step (1) is used for the coal blending treatment in the step (5), firstly, the calorific capacity is measured; if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
Preferably, in the step (1), the yield of <3mm size fraction in the fed raw coal is more than 20 wt%, and the 3/6mm third-stage sieve is used for 3mm sieving; or
In the step (1), the yield of the <3mm size fraction in the fed raw coal is less than or equal to 20 wt%, and the 3/6mm third-stage sieve is used for 6mm sieving.
Preferably, the photoelectric sorting in the step (2) is performed by using a photoelectric sorting machine, and preferably, the photoelectric sorting machine is an X-ray intelligent sorting machine or a gamma-ray intelligent sorting machine; and/or
The dry separation in the step (3) is carried out by adopting a composite dry separator; and/or
The dry separation in the step (4) is carried out by adopting a composite dry separator; and/or
And (3) carrying out third-stage screening in the step (1) by adopting a relaxation screen.
In order to achieve the second purpose of the invention, the invention also provides a system for comprehensively sorting and upgrading low-quality coal by using the method.
Preferably, the system comprises:
the classifying screen is a three-layer relaxation screen and is used for sequentially carrying out three-level screening of 50mm, 13mm and 3/6mm on the fed raw coal to obtain a classifying material with the particle size of more than 50mm, a classifying material with the particle size of 13-50mm, a classifying material with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
the photoelectric separator is connected with the classifying screen and used for receiving classified materials with the grain size larger than 50mm from the classifying screen and performing photoelectric separation on the classified materials to obtain first clean coal and first gangue;
the first compound dry separator is connected with the classifying screen and used for receiving classified materials with the particle size of 13-50mm from the classifying screen and performing dry separation on the classified materials to obtain second clean coal and second gangue;
the second compound dry separator is connected with the classifying screen and is used for receiving the classifying material with the grain size of 3/6-13mm from the classifying screen and performing dry separation on the classifying material to obtain third clean coal and third gangue;
and the coal blending equipment is respectively connected with the grading sieve, the photoelectric separator, the first combined dry separator and the second combined dry separator and is used for receiving any 2 or more of slack coal from the grading sieve, first clean coal from the photoelectric separator, second clean coal from the first combined dry separator and third clean coal from the second combined dry separator so as to blend and blend the coal.
Preferably, the system further comprises:
the first dryer is arranged on a material conveying pipeline from a slack coal discharge port of the classifying screen to the coal blending equipment and is used for drying slack coal from the classifying screen to serve as a feed of the coal blending equipment; and/or
The first dryer is arranged on a material conveying pipeline from an 3/6-13mm classified material discharge port of the classifying screen to the coal blending equipment and is used for drying classified materials with the particle size of 3/6-13mm from the classifying screen to serve as feeding materials of the second compound dry-method separator; and/or
And the third dryer is arranged on a material conveying pipeline from the second combined type dry method sorting machine to the coal blending equipment and is used for drying third clean coal from the second combined type dry method sorting machine to be used as feeding materials of the coal blending equipment.
Preferably, the system further comprises:
the external water content testing device is arranged on a material conveying pipeline from the classifying screen to the second compound dry separator, and is used for testing the external water content of the classified material with the particle size of 3/6-13mm from the classifying screen, feeding the classified material into the second drier for drying treatment when the external water content is more than or equal to 12 wt%, and feeding the classified material into the second compound dry separator when the external water content is less than 12 wt%; preferably, the external water content testing device is an oven or a moisture tester; and/or
The first calorimeter is arranged on a material conveying pipeline from the second compound dry separator to the coal blending equipment and used for measuring the calorific value of third clean coal from the second compound dry separator, so that the third clean coal is fed to the third dryer for drying treatment when the calorific value is less than 3500kcal/kg, and the third clean coal is fed to the coal blending equipment when the calorific value is more than or equal to 3500 kcal/kg; and/or
And the second calorimeter is arranged on a material conveying pipeline from the grading sieve to the coal blending equipment and is used for measuring the calorific value of the slack coal from the grading sieve, feeding the slack coal into the first dryer for drying treatment when the calorific value is less than 3500kcal/kg, and feeding the slack coal into the coal blending equipment when the calorific value is more than or equal to 3500 kcal/kg.
Preferably, a first pipeline is further arranged from the discharge port of the external water content testing device to the feeding port of the second composite dry separator, and is used for directly feeding the discharged material of the external water content testing device to the second composite dry separator when the external water content is less than 12 wt%.
Preferably, a second pipeline is further arranged from the discharge port of the second calorimeter to the feeding port of the coal blending equipment, and the second pipeline is used for directly feeding the discharge of the second calorimeter to the coal blending equipment when the calorific value is more than or equal to 3500 kcal/kg.
Preferably, a third pipeline is further arranged from the discharge port of the first calorimeter to the feeding port of the coal blending equipment, and is used for directly feeding the discharge of the first calorimeter to the coal blending equipment when the calorific value is more than or equal to 3500 kcal/kg.
The invention has the beneficial effects that:
the invention discloses a method and a system for comprehensively sorting and upgrading low-quality coal,
(1) the dry coal preparation technology is adopted, so that the method is suitable for sticky wet power coal and low-quality coal which are difficult to apply to wet coal preparation; the method is suitable for arid water-deficient areas with rich western coal resources in China; the separated coal slime is less, a desliming process is not needed, and the product does not contain a coal slime product;
(2) the method combines multi-stage screening, sorting and drying technologies to obtain sorted products with large quality difference; any 2 or more selected products can be selected to mix and blend coal according to the needs or the customer needs, and a coal blending product meeting the needs or the customer needs is obtained;
(3) the process flow is simple, the flexibility is strong, the quality improvement efficiency is high, the product structure is reasonable, the efficiency is high, the energy is saved, and the production cost is low;
(4) the method can comprehensively improve the quality of specific low-quality coal in a targeted manner, effectively increase the yield of clean coal, expand the product structure of the coal, realize the efficiency improvement and quality improvement of the low-quality coal and increase the economic benefit of enterprises.
Drawings
Fig. 1 is a schematic structural diagram of a system for integrated separation and upgrading of low-quality coal according to an embodiment of the invention.
Detailed Description
The technical solution and the effects of the present invention will be further explained with reference to the accompanying drawings and the detailed description. The following embodiments are merely illustrative of the present invention, and the present invention is not limited to the following embodiments or examples. Simple modifications of the invention applying the inventive concept are within the scope of the invention as claimed.
The invention provides a method for comprehensively sorting and upgrading low-quality coal, which comprises the following steps of:
(1) carrying out three-stage screening of 50mm, 13mm and 3/6mm on the fed raw coal in sequence to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
(2) performing photoelectric separation on the classified material with the particle size larger than 50mm obtained in the step (1) to obtain first clean coal and first gangue;
(3) performing dry separation on the classified material with the particle size of 13-50mm obtained in the step (1) to obtain second clean coal and second gangue;
(4) carrying out dry separation on the classified material with the particle size of 3/6-13mm obtained in the step (1) to obtain third clean coal and third gangue;
(5) carrying out coal blending treatment to obtain a coal blending product; wherein, the coal blending treatment is to mix and blend coal by adopting any 2 or more of the following materials:
firstly, obtaining slack coal in the step (1);
② the first clean coal obtained in the step (2);
③ the second clean coal obtained in the step (3);
fourthly, the third clean coal obtained in the step (4).
As understood by those skilled in the art, the three-stage screening is sequential, and the screen hole sizes of the three-stage screening surfaces arranged from top to bottom are respectively 50mm, 13mm and 3/6mm (3/6mm is 3mm or 6mm), so that classified materials with different particle size ranges are obtained. The three-stage screening in the step (1) can adopt a grading screening device commonly used in the field, such as a grading screen, preferably a three-layer relaxation screen; the photoelectric sorting in the step (2) can adopt a photoelectric sorting device commonly used in the field, such as a photoelectric sorting machine, preferably an X-ray intelligent sorting machine or a gamma-ray intelligent sorting machine; the dry separation in the step (3) can adopt dry separation equipment commonly used in the field, such as a composite dry separator; the dry separation in step (4) may adopt a dry separation device commonly used in the art, such as a composite dry separator.
According to the method for comprehensively sorting and upgrading low-quality coal, the fed raw coal is sequentially subjected to three-level screening of 50mm, 13mm and 3/6mm to obtain the fed raw coal with different size fractions and different qualities; according to the quality of the selected raw coal with different size grades and different qualities and the quality requirement of a user on the product, the selected raw coal with different size grades can be selected to be properly sorted, so that various sorted products with different qualities are obtained, and the product structure is effectively expanded; and the sorted products can be used for blending and blending coal to obtain a coal blending product which can meet the requirements of users.
In one embodiment, the classified material with the particle size of 3/6-13mm obtained in the step (1) is dried until the external water content is less than 12 wt% before being subjected to the dry sorting in the step (4); or
The classified material with the particle size of 3/6-13mm obtained in the step (1) is subjected to external water content measurement before being subjected to dry separation in the step (4); if the external water content is more than or equal to 12 wt%, drying the mixture until the external water content is less than 12 wt%; and (4) directly carrying out dry sorting in the step (4) if the external water content is less than 12 wt%.
The drying treatment can avoid the influence of the large external water content of the corresponding classified materials on the separation effect, and further on the subsequent coal blending effect.
Those skilled in the art will appreciate that the external water content measurement can be performed using external water content measuring devices commonly used in the art, such as an oven or a moisture meter.
In one embodiment, the third clean coal obtained in the step (4) is dried to the calorific value of more than or equal to 3500kcal/kg before being used for the coal blending treatment in the step (5); or
Measuring the calorific value of the third clean coal obtained in the step (4) before the third clean coal is used for the coal blending treatment in the step (5); if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
In one embodiment, the slack coal obtained in the step (1) is dried to the calorific value of more than or equal to 3500kcal/kg before being used for the coal blending treatment in the step (5); or
Before the slack coal obtained in the step (1) is used for the coal blending treatment in the step (5), firstly, the calorific capacity is measured; if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
The drying treatment can improve the heat productivity of the corresponding grading materials, and avoids the influence of the smaller heat productivity on the quality of the sorted products, thereby influencing the subsequent coal blending effect.
Those skilled in the art will appreciate that the heat generation amount measurement can be performed using a heat generation amount test device commonly used in the art, such as a calorimeter.
Those skilled in the art will appreciate that the drying of the present invention may be employed with dryers such as rotary dryers employing evaporative upgrading techniques, tumble dryers employing heat transfer techniques, and rotary wing dryers.
According to the method for comprehensively sorting and upgrading low-quality coal, the fed raw coal is sequentially subjected to three-level screening of 50mm, 13mm and 3/6mm to obtain the fed raw coal with different size fractions and different qualities; according to the quality of the selected raw coal with different size grades and different qualities and the quality requirement of a user on products, the selected raw coal with different size grades can be selected to be properly sorted, or a proper drying process is further selected, so that the energy consumption in the quality improvement process is effectively reduced, a plurality of sorted products with different qualities are obtained, and the product structure is effectively expanded; and the sorted products can be used for blending and blending coal to obtain a coal blending product which can meet the requirements of users.
In one embodiment, in step (1), the yield of <3mm size fraction in the input raw coal is > 20 wt%, and the 3/6mm tertiary sieve is 3mm sieve; or
In the step (1), the yield of the <3mm size fraction in the fed raw coal is less than or equal to 20 wt%, and the 3/6mm third-stage sieve is used for 6mm sieving.
The skilled person understands that the yield of <3mm size fraction in the fed raw coal refers to the content of material with a particle size of <3mm in the fed raw coal, i.e. the mass percentage of material with a particle size of <3mm in the fed raw coal to the total amount of the fed raw coal.
In one embodiment, the photoelectric sorting in the step (2) is performed by using a photoelectric sorting machine, preferably the photoelectric sorting machine is an X-ray intelligent sorting machine or a gamma-ray intelligent sorting machine; and/or
The dry separation in the step (3) is carried out by adopting a composite dry separator; and/or
The dry separation in the step (4) is carried out by adopting a composite dry separator; and/or
And (2) carrying out three-stage screening in the step (1) by adopting a three-layer relaxation screen.
The invention also provides a system for comprehensively sorting and upgrading low-quality coal by using the method.
In one embodiment, as shown in FIG. 1, the system comprises:
the classifying screen 1 is a three-layer relaxation screen and is used for sequentially carrying out three-level screening of 50mm, 13mm and 3/6mm on fed raw coal to obtain classified materials with the particle size of more than 50mm, classified materials with the particle size of 13-50mm, classified materials with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
the photoelectric separator 2 is connected with the classifying screen 1 and is used for receiving classified materials with the grain size larger than 50mm from the classifying screen 1 and performing photoelectric separation on the classified materials to obtain first clean coal and first gangue;
the first compound dry separator 3 is connected with the classifying screen 1 and is used for receiving the classifying material with the particle size of 13-50mm from the classifying screen 1 and performing dry separation on the classifying material to obtain second clean coal and second gangue;
the second compound dry separator 4 is connected with the classifying screen 1 and is used for receiving the classifying material with the grain diameter of 3/6-13mm from the classifying screen 1 and performing dry separation on the classifying material to obtain third clean coal and third gangue;
and the coal blending equipment 5 is respectively connected with the grading sieve 1, the photoelectric separator 2, the first combined dry separator 3 and the second combined dry separator 4 and is used for receiving any 2 or more of the slack coal from the grading sieve 1, the first clean coal from the photoelectric separator 2, the second clean coal from the first combined dry separator 3 and the third clean coal from the second combined dry separator 4 so as to blend and blend the coal.
Those skilled in the art understand that the specific selection of several and which sorted materials to mix and blend coal can be selected according to the quality of the sorted materials and the quality requirement of the coal blending product by the user.
Those skilled in the art will appreciate that the coal blending facility may be one commonly used in the art, and typically employs a plurality of belts + coal feeders to achieve its coal blending function.
According to the system for comprehensively sorting and upgrading low-quality coal by using the method, the fed raw coal is sequentially subjected to three-level screening of 50mm, 13mm and 3/6mm to obtain the fed raw coal with different size grades and different qualities; according to the quality of the selected raw coal with different size grades and different qualities and the quality requirement of a user on the product, the selected raw coal with different size grades can be selected to be properly sorted, so that various sorted products with different qualities are obtained, and the product structure is effectively expanded; and the sorted products can be used for blending and blending coal to obtain a coal blending product which can meet the requirements of users.
In order to improve the quality of the respective classified material, in one embodiment the system further comprises:
the first dryer 6 is arranged on a material conveying pipeline from a slack coal discharge port of the classifying screen 1 to the coal blending equipment 5, and is used for drying the slack coal from the classifying screen 1 to serve as the feed of the coal blending equipment 5; and/or
The second dryer 7 is arranged on a material conveying pipeline from an 3/6-13mm classified material discharge port of the classifying screen 1 to the coal blending equipment 5, and is used for drying classified materials with the particle size of 3/6-13mm from the classifying screen 1 to serve as feeding materials of the second compound dry separator 4; and/or
And the third dryer 8 is arranged on a material conveying pipeline from the second combined type dry method separator 4 to the coal blending equipment 5, and is used for drying third clean coal from the second combined type dry method separator 4 to be used as a feeding material of the coal blending equipment 5.
In one embodiment, the system further comprises:
an external water content testing device 9, wherein the external water content testing device 9 is arranged on a material conveying pipeline from the classifying screen 1 to the second combined type dry method sorting machine 4, and is used for measuring the external water content of the classified material with the particle size of 3/6-13mm from the classifying screen 1, feeding the classified material into the second drying machine 7 for drying treatment when the external water content is more than or equal to 12 wt%, and feeding the classified material into the second combined type dry method sorting machine 4 when the external water content is less than 12 wt%; preferably, the external water content testing device 9 is an oven or a moisture tester; and/or
The first calorimeter 10 is arranged on a material conveying pipeline from the second combined type dry method separator 4 to the coal blending equipment 5, and is used for measuring the calorific value of third clean coal from the second combined type dry method separator 4, feeding the third clean coal into the third dryer 8 for drying treatment when the calorific value is less than 3500kcal/kg, and feeding the third clean coal into the coal blending equipment 5 when the calorific value is more than or equal to 3500 kcal/kg; and/or
And the second calorimeter 11 is arranged on a material conveying pipeline from the classifying screen 1 to the coal blending equipment 5, and is used for measuring the calorific value of the slack coal from the classifying screen 1, feeding the slack coal into the first dryer 6 for drying treatment when the calorific value is less than 3500kcal/kg, and feeding the slack coal into the coal blending equipment 5 when the calorific value is more than or equal to 3500 kcal/kg.
In one embodiment, a first pipe 12 is further disposed from the discharge port of the external water content testing device 9 to the feeding port of the second hybrid dry method separator 4, and is used for directly feeding the discharge port of the external water content testing device 9 to the second hybrid dry method separator 4 when the external water content is less than 12 wt%.
In one embodiment, a second pipeline 13 is further arranged from the discharge port of the second calorimeter 11 to the feed port of the coal blending equipment 5, and is used for directly feeding the discharge port of the second calorimeter 11 to the coal blending equipment 5 when the calorific value is more than or equal to 3500 kcal/kg.
In one embodiment, a third pipeline 14 is further arranged from the discharge port of the first calorimeter 10 to the feed port of the coal blending equipment 5, and is used for directly feeding the discharge port of the first calorimeter 10 to the coal blending equipment 5 when the calorific value is more than or equal to 3500 kcal/kg.
As understood by those skilled in the art, each material conveying pipeline and the pipeline are provided with valves for controlling the direction and flow of the corresponding classified materials according to the treatment modes of different materials.
According to the system for comprehensively sorting and upgrading low-quality coal by using the method, the fed raw coal is sequentially subjected to three-level screening of 50mm, 13mm and 3/6mm to obtain the fed raw coal with different size grades and different qualities; according to the quality of the selected raw coal with different size grades and different qualities and the quality requirement of a user on products, the selected raw coal with different size grades can be selected to be properly sorted, or a proper drying process is further selected, so that the energy consumption in the quality improvement process is effectively reduced, a plurality of sorted products with different qualities are obtained, and the product structure is effectively expanded; and the sorted products can be used for blending and blending coal to obtain a coal blending product which can meet the requirements of users.
As shown in fig. 1, in one embodiment, the system for integrated separation and upgrading of low quality coal of the present invention operates as follows:
(1) inputting the fed raw coal into the classifying screen 1 to sequentially carry out three-stage screening of 50mm, 13mm and 3/6mm to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
(2) inputting the classified material with the particle size larger than 50mm obtained in the step (1) into the photoelectric separator 2 for photoelectric separation to obtain first clean coal and first gangue;
(3) inputting the classified material with the particle size of 13-50mm obtained in the step (1) into the first compound dry separator 3 for separation to obtain second clean coal and second gangue;
(4) inputting the classified material with the particle size of 3/6-13mm obtained in the step (1) into the external water content testing device 9 for external water content testing; if the external water content is more than or equal to 12 wt% through testing, feeding the coal to the second dryer 7 for drying treatment until the external water content is less than 12 wt%, and then feeding the coal to the second compound dry separator 4 for separation to obtain third clean coal and third gangue; if the external water content is less than 12 wt% through testing, directly feeding the materials into the second compound dry method sorting machine 4 through the first pipeline 12 for sorting to obtain third clean coal and third gangue;
(5) inputting the third clean coal obtained in the step (4) into the first calorimeter 10 for calorific value test; if the heat productivity is less than 3500kcal/kg, feeding the material into the third dryer 8 for drying treatment until the heat productivity is more than or equal to 3500kcal/kg for standby; if the heat productivity is more than or equal to 3500kcal/kg, the heat productivity is directly used;
(6) inputting the slack coal obtained in the step (1) into the second calorimeter 11 for heat productivity test; if the heat productivity is less than 3500kcal/kg, feeding the raw materials into the first dryer 6 for drying treatment until the heat productivity is more than or equal to 3500kcal/kg for standby; if the heat productivity is more than or equal to 3500kcal/kg, the heat productivity is directly used;
(7) inputting any 2 or more than 2 of the slack coal obtained in the step (6), the first clean coal obtained in the step (2), the second clean coal obtained in the step (3) and the third clean coal obtained in the step (5) into the coal blending equipment 5 for blending and blending coal to obtain a coal blending product.
Examples 1 to 2(S1-2)
In example 1-2(S1-2), the treatment scale of the system was 2.0Mt/a in annual treatment amount;
the raw coal is from New mineral of Mirabio Temminck (example 1) and elm well mineral of Mirabio Temminck (example 2);
the classifying screen 1 is a three-layer tension-relaxation screen, the aperture of the screen hole of the upper layer is 50mm, the aperture of the screen hole of the middle layer is 13mm, the aperture of the screen hole of the lower layer is 3mm, the model is 2460, and the manufacturer is Anshan saddle heavy mining machinery Co., Ltd (example 1);
the classifying screen 1 is a three-layer relaxation screen, the pore diameter of the upper layer is 50mm, the pore diameter of the middle layer is 13mm, the pore diameter of the lower layer is 6mm, the model is 2148, and the manufacturer is Anshan saddle heavy mining machinery Co., Ltd (example 2);
the photoelectric separator 2 is an X-ray intelligent separator with the model IDS100A and is made by Tangshan Shenzhou mechanical group Co., Ltd (example 1);
the photoelectric separator 2 is a gamma-ray intelligent separator with a model IDS100B, and is made by Tangshan Shenzhou mechanical group Co., Ltd (example 2);
a first hybrid dry sorter 3 and a second hybrid dry sorter 4, model numbers ZM200 and ZM100, respectively, from Shenzhou mechanical group, Tangshan, Inc. (examples 1 and 2);
the first dryer 6 and the second dryer 7 are rotary wing dryers, both of which are of the type WJG80, manufactured by shenyang yuhua environmental protection ltd (example 1);
the first dryer 6 and the third dryer 8 are drum dryers of the types DLMG100 and DLMG60, respectively, and manufactured by zhengzhou dingli new energy technology ltd (example 2);
the external water content measuring device 9 is a moisture tester, model MA150, manufactured by sydow sydoris corporation (examples 1 and 2);
the first calorimeter 10 and the second calorimeter 11 are of the type ZDHW-HN8000 and are manufactured by Huaneng electronic technology, Inc. of Heqiang city (examples 1 and 2).
The external water content test method comprises the following steps: at 10 am every day, 20kg of raw coal is sampled from a discharge chute of a vibrating screen of 3/6-13mm, 0.5kg of raw coal is sampled after blending and division, and a moisture tester is arranged to measure the moisture of the raw coal.
Heating value test method: at 10 am every day, 20kg of samples are respectively taken from a 0-3mm classifying screen discharge chute and a second composite dry method separator 4 clean coal chute, 1kg of samples are respectively taken after mixing and division, ore grinding is carried out until the ore is less than 0.2mm, 0.9-1.1g of samples are taken, and a calorimeter is placed to measure the calorific value of coal.
Example 1
As shown in figure 1, the embodiment 1 adopts the method and the system shown in figure 1 to comprehensively sort and upgrade the raw coal, and comprises the following steps:
(1) inputting the fed raw coal into the classifying screen 1 to sequentially carry out three-stage screening of 50mm, 13mm and 3mm to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 3-13mm and slack coal with the particle size of less than 3 mm;
(2) inputting the classified material with the grain diameter larger than 50mm obtained in the step (1) into the photoelectric separator 2 (an X-ray intelligent separator) for photoelectric separation to obtain first clean coal (with the heat generation amount of 4570kcal/kg) and first gangue;
(3) inputting the classified material with the grain diameter of 13-50mm obtained in the step (1) into the first compound dry separator 3 for separation to obtain second clean coal (with the calorific value of 4236kcal/kg) and second gangue;
(4) inputting the classified material with the grain size of 3-13mm obtained in the step (1) into the external water content testing device 9 for external water content testing to obtain the external water content of more than 12 wt%, then feeding the classified material into the second dryer 7 (rotor wing dryer) for drying treatment until the external water content is less than 12 wt%, and then feeding the classified material into the second combined dry-method separator 4 for separation to obtain third clean coal and third gangue;
(5) inputting the third clean coal obtained in the step (4) into the first calorimeter 10 for calorific value test to obtain the calorific value of 3673kcal/kg (more than 3500kcal/kg) for later use;
(6) inputting the slack coal obtained in the step (1) into the second calorimeter 11 for heat productivity test to obtain the heat productivity of 3358kcal/kg (<3500kcal/kg), and then feeding the slack coal into the first dryer 6 (rotary wing dryer) for drying treatment until the heat productivity is more than or equal to 3500kcal/kg, specifically 3583kcal/kg for later use;
(7) directly selling the first clean coal obtained in the step (2) as a product; and (3) blending the second clean coal obtained in the step (3), the third clean coal obtained in the step (5) and the slack coal obtained in the step (6) according to the mass ratio of 3.3:1:1 to obtain a blended coal product with the calorific value of 4036 kcal/kg.
Example 2
As shown in figure 1, the embodiment 2 adopts the method and the system shown in figure 1 to comprehensively sort and upgrade the raw coal, and comprises the following steps:
(1) inputting the fed raw coal into the classifying screen 1 to sequentially carry out three-stage screening of 50mm, 13mm and 6mm to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 6-13mm and slack coal with the particle size of less than 6 mm;
(2) inputting the classified material with the grain diameter larger than 50mm obtained in the step (1) into the photoelectric separator 2 (gamma-ray intelligent separator) for photoelectric separation to obtain first clean coal (with the calorific value of 4012kcal/kg) and first gangue;
(3) inputting the classified material with the grain diameter of 13-50mm obtained in the step (1) into the first compound dry separator 3 for separation to obtain second clean coal (with the calorific value of 3713kcal/kg) and second gangue;
(4) inputting the classified material with the particle size of 6-13mm obtained in the step (1) into the external water content testing device 9 for external water content testing to obtain the external water content of less than 12 wt%, and then feeding the classified material into the second compound dry separator 4 for separation to obtain third clean coal and third gangue;
(5) inputting the third clean coal obtained in the step (4) into the first calorimeter 10 for heat productivity test to obtain the heat productivity of 3429kcal/kg (<3500kcal/kg), and then feeding the third clean coal into the third dryer 8 (a roller dryer) for drying treatment until the heat productivity is more than or equal to 3500kcal/kg, specifically 3649kcal/kg for later use;
(6) inputting the slack coal obtained in the step (1) into the second calorimeter 11 for heat productivity test to obtain the heat productivity of 3296kcal/kg (<3500kcal/kg), and then feeding the slack coal into the first dryer 6 (roller dryer) for drying treatment until the heat productivity is more than or equal to 3500kcal/kg, specifically 3522kcal/kg, for later use;
(7) directly selling the first clean coal obtained in the step (2) and the second clean coal obtained in the step (3) as products respectively; blending the third clean coal obtained in the step (5) and the slack coal obtained in the step (6) according to the mass ratio of 1:1 to obtain a blended coal product with the calorific value of 3585 kcal/kg.
In example 2, the annual yields of the first cleaned coal having a particle size >50mm, the second cleaned coal having a particle size of 13-50mm, the third cleaned coal having a particle size of 6-13mm, and the slack coal having a particle size <6mm were 30 ten thousand tons, 75 ten thousand tons, 22.5 ten thousand tons, and 22.5 ten thousand tons, respectively;
the first clean coal with the grain diameter of more than 50mm has the calorific value of 4012kcal/kg and is sold according to the grade price of 4000 kcal/kg; the second clean coal with the particle size of 13-50mm has the calorific value of 3713kcal/kg and is sold according to the grade price of 3700-3800 kcal/kg; the clean coal with the grain diameter of 0-13mm (the third clean coal with the grain diameter of 6-13mm and the slack coal with the grain diameter of less than 6mm are mixed and blended with coal according to the mass ratio of 1:1 to obtain a blended coal product with the calorific value of 3585 kcal/kg) is sold according to the grade price of 3500-3600 kcal/kg.
Comparative example 1
Compared with the embodiment 2, the sorting process comprises the following steps: raw coal is sieved by 30mm and 6mm classifying screens in sequence; the annual output of the obtained classified material with the grain size of more than 30mm, the classified material with the grain size of 6-30mm and the classified material with the grain size of less than 6mm is respectively 60 ten thousand tons, 30 ten thousand tons and 60 ten thousand tons;
the grading material with the grain diameter of more than 30mm has the heat value of 3726kcal/kg and is directly sold according to the grade price of 3700-; classifying the classified materials with the particle size of 6-30mm by a composite dry separator to obtain clean coal, wherein the calorific value is 3577kcal/kg, and the clean coal is sold according to the grade price of 3500-3600 kcal/kg; the grading material with the grain diameter of less than 6mm has the heat value of 3296kcal/kg, is sold as low-quality coal according to the grade price of less than 3500kcal/kg and is used as coal blending.
Compared with the comparative example 1, the embodiment 2 has the advantages that all products are sold according to qualified products, the heat productivity of the products is improved, the quality of the products is improved, the price is greatly improved, and the economic benefit is obvious compared with the comparative example 1.
Claims (10)
1. The method for comprehensively sorting and upgrading the low-quality coal is characterized by comprising the following steps:
(1) carrying out three-stage screening of 50mm, 13mm and 3/6mm on the fed raw coal in sequence to obtain a classified material with the particle size of more than 50mm, a classified material with the particle size of 13-50mm, a classified material with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
(2) performing photoelectric separation on the classified material with the particle size larger than 50mm obtained in the step (1) to obtain first clean coal and first gangue;
(3) performing dry separation on the classified material with the particle size of 13-50mm obtained in the step (1) to obtain second clean coal and second gangue;
(4) carrying out dry separation on the classified material with the particle size of 3/6-13mm obtained in the step (1) to obtain third clean coal and third gangue;
(5) carrying out coal blending treatment to obtain a coal blending product; wherein, the coal blending treatment is to mix and blend coal by adopting any 2 or more of the following materials:
firstly, obtaining slack coal in the step (1);
② the first clean coal obtained in the step (2);
③ the second clean coal obtained in the step (3);
fourthly, the third clean coal obtained in the step (4).
2. The method as claimed in claim 1, wherein the classified material with the particle size of 3/6-13mm obtained in step (1) is dried to have an external water content of less than 12 wt% before being subjected to the dry sorting in step (4); or
The classified material with the particle size of 3/6-13mm obtained in the step (1) is subjected to external water content measurement before being subjected to dry separation in the step (4); if the external water content is more than or equal to 12 wt%, drying the mixture until the external water content is less than 12 wt%; and (4) directly carrying out dry sorting in the step (4) if the external water content is less than 12 wt%.
3. The method according to claim 1 or 2, characterized in that the third clean coal obtained in step (4) is dried to the calorific value of 3500kcal/kg or more before being used for the coal blending treatment in step (5); or alternatively
Measuring the calorific value of the third clean coal obtained in the step (4) before the third clean coal is used for the coal blending treatment in the step (5); if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
4. The method according to any one of claims 1 to 3, wherein the slack coal obtained in the step (1) is dried to the calorific value of more than or equal to 3500kcal/kg before being used for the coal blending treatment in the step (5); or
Before the slack coal obtained in the step (1) is used for the coal blending treatment in the step (5), firstly, the calorific capacity is measured; if the calorific value is less than 3500kcal/kg, drying the material until the calorific value is more than or equal to 3500 kcal/kg; if the calorific value is not less than 3500kcal/kg, the catalyst is directly used in the step (5).
5. The process according to any one of claims 1 to 4, wherein in step (1), the yield of <3mm size fraction in the input raw coal is > 20 wt%, and the 3/6mm tertiary sieve is 3mm sieve; or
In the step (1), the yield of the <3mm size fraction in the fed raw coal is less than or equal to 20 wt%, and the 3/6mm third-stage sieve is used for 6mm sieving.
6. The method according to any one of claims 1 to 5, wherein the photoelectric sorting in step (2) is performed by using a photoelectric sorter, preferably the photoelectric sorter is an X-ray intelligent sorter or a gamma-ray intelligent sorter; and/or
The dry separation in the step (3) is carried out by adopting a composite dry separator; and/or
The dry separation in the step (4) is carried out by adopting a composite dry separator; and/or
And (3) carrying out third-stage screening in the step (1) by adopting a relaxation screen.
7. A system for comprehensively sorting and upgrading low-quality coal by using the method of any one of claims 1 to 6.
8. The system of claim 7, wherein the system comprises:
the classifying screen (1) is a three-layer relaxation screen and is used for sequentially carrying out three-level screening of 50mm, 13mm and 3/6mm on fed raw coal to obtain classified materials with the particle size of more than 50mm, classified materials with the particle size of 13-50mm, classified materials with the particle size of 3/6-13mm and slack coal with the particle size of less than 3/6 mm;
the photoelectric separator (2) is connected with the classifying screen (1) and is used for receiving classified materials with the grain size larger than 50mm from the classifying screen (1) and performing photoelectric separation on the classified materials to obtain first clean coal and first gangue;
the first compound dry separator (3) is connected with the classifying screen (1) and is used for receiving classified materials with the particle size of 13-50mm from the classifying screen (1) and performing dry separation on the classified materials to obtain second clean coal and second gangue;
the second compound dry separator (4) is connected with the classifying screen (1) and is used for receiving the classified material with the grain diameter of 3/6-13mm from the classifying screen (1) and performing dry separation on the classified material to obtain third clean coal and third gangue;
and the coal blending equipment (5) is respectively connected with the grading sieve (1), the photoelectric separator (2), the first combined dry separator (3) and the second combined dry separator (4) and is used for receiving any 2 or more of the slack coal from the grading sieve (1), the first clean coal from the photoelectric separator (2), the second clean coal from the first combined dry separator (3) and the third clean coal from the second combined dry separator (4) so as to mix and blend the coal.
9. The system of claim 8, further comprising:
the first dryer (6) is arranged on a material conveying pipeline from a slack coal discharge port of the classifying screen (1) to the coal blending device (5) and is used for drying the slack coal from the classifying screen (1) to serve as a feed of the coal blending device (5); and/or
A second dryer (7), wherein the first dryer (6) is arranged on a material conveying pipeline from an 3/6-13mm classified material discharge port of the classifying screen (1) to the coal blending equipment (5) and is used for drying the classified material with the particle size of 3/6-13mm from the classifying screen (1) to be used as the feeding material of the second compound dry separator (4); and/or
And the third dryer (8) is arranged on a material conveying pipeline from the second compound dry-method separator (4) to the coal blending equipment (5) and is used for drying third clean coal from the second compound dry-method separator (4) to be used as the feeding material of the coal blending equipment (5).
10. The system of claim 9, further comprising:
the external water content testing device (9) is arranged on a material conveying pipeline from the classifying screen (1) to the second combined dry-method sorting machine (4) and is used for testing the external water content of the classified material with the particle size of 3/6-13mm from the classifying screen (1), so that the classified material is fed into the second drying machine (7) for drying treatment when the external water content is more than or equal to 12 wt%, and is fed into the second combined dry-method sorting machine (4) when the external water content is less than 12 wt%; preferably, the external water content testing device (9) is an oven or a moisture tester; and/or
The first calorimeter (10) is arranged on a material conveying pipeline from the second compound dry separator (4) to the coal blending equipment (5) and is used for measuring the calorific value of third clean coal from the second compound dry separator (4), feeding the third clean coal into the third dryer (8) for drying treatment when the calorific value is less than 3500kcal/kg, and feeding the third clean coal into the coal blending equipment (5) when the calorific value is more than or equal to 3500 kcal/kg; and/or
The second calorimeter (11) is arranged on a material conveying pipeline from the classifying screen (1) to the coal blending equipment (5) and is used for measuring the calorific value of the slack coal from the classifying screen (1), feeding the slack coal to the first dryer (6) for drying treatment when the calorific value is less than 3500kcal/kg, and feeding the slack coal to the coal blending equipment (5) when the calorific value is more than or equal to 3500 kcal/kg;
preferably, a first pipeline (12) is further arranged from the discharge hole of the external water content testing device (9) to the feeding hole of the second compound dry-method separator (4), and the first pipeline is used for directly feeding the discharged material of the external water content testing device (9) to the second compound dry-method separator (4) when the external water content is less than 12 wt%;
preferably, a second pipeline (13) is arranged from the discharge hole of the second calorimeter (11) to the feeding hole of the coal blending equipment (5), and is used for directly feeding the discharged material of the second calorimeter (11) to the coal blending equipment (5) when the calorific value is more than or equal to 3500 kcal/kg;
preferably, a third pipeline (14) is arranged from the discharge hole of the first calorimeter (10) to the feed inlet of the coal blending equipment (5), and is used for directly feeding the discharge of the first calorimeter (10) to the coal blending equipment (5) when the calorific value is more than or equal to 3500 kcal/kg.
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