CN114130553A - Fly ash preparation system and preparation process - Google Patents
Fly ash preparation system and preparation process Download PDFInfo
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- CN114130553A CN114130553A CN202111260084.9A CN202111260084A CN114130553A CN 114130553 A CN114130553 A CN 114130553A CN 202111260084 A CN202111260084 A CN 202111260084A CN 114130553 A CN114130553 A CN 114130553A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 53
- 238000000926 separation method Methods 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims description 13
- 230000005284 excitation Effects 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052799 carbon Inorganic materials 0.000 abstract description 19
- 239000002956 ash Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 10
- 239000010883 coal ash Substances 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005261 decarburization Methods 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 40
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- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 229910052661 anorthite Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
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- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/001—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with means for electrostatic separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/002—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external filters
Abstract
The invention relates to the technical field of mineral separation and discloses a fly ash preparation system and a process, wherein the fly ash preparation system comprises a fly ash warehouse, a slag warehouse, a pulsating airflow sorting bed, a friction device, a high-voltage electrostatic sorting machine, a three-way chute, a medium-speed mill and a cyclone classifier. The method comprises the following steps of firstly, roughly sorting original fly ash in a pulsating airflow sorting bed, wherein a sorted heavy product is a main source of a fly ash product, and a light product is finely sorted by a friction charge of a friction device and a high-voltage electrostatic sorting machine to remove combustible carbon in the fly ash; returning the combustible carbon subjected to two-stage separation to a boiler for combustion; and part of the original furnace slag is ground by a medium-speed mill and then is doped into the decarburized fly ash to produce a high-quality fly ash product. The invention is suitable for the coal ash decarburization and quality improvement of a coal-fired boiler system, can realize the recycling of carbon resources and produce high-quality coal ash products by a one-coarse-fine two-stage separation and ash mixing process, and is beneficial to realizing the purposes of energy conservation, carbon reduction and efficiency improvement of the coal-fired boiler system.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a fly ash preparation system and a preparation process.
Background
The fly ash is fine ash particles carried by flue gas in the coal combustion process and supplemented by a dust collector, and belongs to one of main solid wastes of a coal-fired boiler system. In the prior art, fuel property fluctuation and combustion technology limitation cause that fuel in a boiler can not be completely combusted, so that the carbon content of fly ash is high, and the carbon content of the fly ash in China is about 0.63-29.97 percent at present. The excessively high carbon content in the fly ash not only causes great waste of carbon-burning resources, but also reduces the quality of the fly ash and limits the high-value utilization of the fly ash. Therefore, the decarbonization and upgrading of the fly ash are effective means for improving the comprehensive utilization rate of the fly ash at the present stage.
At present, the coal ash decarburization quality improvement technology mainly takes flotation and triboelectric separation as main techniques. Flotation has the advantages of high separation efficiency, large treatment capacity and the like, but the links of sewage treatment, dehydration of the selected product and the like are required to be added, and the process is relatively complex. Compared with flotation, triboelectric separation is a simple and efficient dry separation technology, and has been widely applied in the fields of waste plastic recovery, potassium ore salt purification, phosphate ore separation and the like, but the triboelectric separation also has the defects of small treatment capacity, high energy consumption and the like. In fact, the fly ash belongs to an artificial volcanic ash granular material, the water content of the granules is extremely low, and the adsorption agglomeration phenomenon does not exist among the granules, and the properties create favorable conditions for a fly ash triboelectric separation method.
In addition, the chemical components of the slag generated by the coal-fired boiler are similar to those of the fly ash, and the slag mainly comprises quartz, mullite, anorthite and the like. The slag has the characteristics of coarse particle size, low carbon content, large yield (about 1/2 of the yield of the fly ash) and the like, but the market price of the slag is not as high as 1/5 of the fly ash. How to improve the comprehensive utilization rate of the slag is also a problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a fly ash preparation system and a preparation process, which have the advantages of flexible and efficient process, high separation precision, no secondary pollution and the like.
Based on the above, the invention provides a fly ash preparation system, which comprises a fly ash warehouse, a pulsating airflow sorting bed, a first cyclone classifier, a friction device, a high-pressure electrostatic sorting machine, a slag warehouse, a three-way chute, a medium-speed mill, a second cyclone classifier, a slag collection warehouse and a fly ash collection warehouse, wherein a discharge port of the fly ash warehouse is connected with a feed port of the pulsating airflow sorting bed, the pulsating airflow sorting bed is provided with a light product discharge port and a heavy product discharge port, the light product discharge port is connected with the feed port of the friction device, the heavy product discharge port is connected with the fly ash collection warehouse, a discharge port of the friction device is connected with the feed port of the high-pressure electrostatic sorting machine, the high-pressure electrostatic sorting machine is provided with a negative electrode end discharge port and a positive electrode end discharge port, wherein the negative electrode end discharge port is connected with a boiler feed port, the positive pole end discharge gate with the storehouse is collected to the fly ash is connected, the gas outlet has still been seted up at the top of pulsating gas flow sorting bed, the gas outlet with first cyclone classifier is connected, the underflow opening of first cyclone classifier is likewise with the pan feeding mouth of friction ware is connected, the discharge gate and the intermediate speed of slag storehouse are ground the pan feeding mouth and are connected, the discharge gate and the second cyclone classifier of intermediate speed mill are connected, the underflow opening of second cyclone classifier with the storehouse is collected to the fly ash and is connected.
The invention also provides a fly ash preparation process, which adopts the fly ash preparation system and comprises the following specific operation steps:
s1, conveying the original fly ash into a fly ash warehouse;
s2, feeding the original fly ash in the fly ash warehouse into a pulsating flow separator for roughing;
s3, sending the heavy product separated by the pulsating airflow separator into a fly ash collection warehouse;
s4, sending the light products separated by the pulsating airflow separator into a friction charger for friction charging;
s5, the first cyclone classifier traps and recovers the winnowing particles of the pulsating airflow sorting bed;
s6, sending the light products subjected to friction charge of the friction device into a high-voltage electrostatic separator;
s7, sorting the light products by a high-voltage electrostatic sorting machine, gathering the products at the negative electrode end of the high-voltage electrostatic sorting machine and sending the products at the positive electrode end of the high-voltage electrostatic sorting machine into a boiler, and gathering the products at the positive electrode end of the high-voltage electrostatic sorting machine and sending the products into a fly ash collection warehouse;
s8, sending the original slag into a slag warehouse;
s9, feeding part of original slag in the slag warehouse into a medium-speed mill through a three-way chute, and feeding other original slag into a slag collection warehouse;
s10, grinding the original slag by using a medium-speed mill;
and S11, performing gas-solid separation on the medium-speed mill by using a second cyclone classifier, and conveying the ground fine-grain slag into a fly ash collection warehouse.
In some embodiments of the present application, the pulsed air flow classifier has a pulsed air flow frequency in the range of 0.5 to 10Hz and a separation density of 1.8 to 2.2g/cm3。
In some embodiments of the application, the excitation voltage of the positive plate of the high-voltage electrostatic separator is 0-100 kV, and the excitation voltage of the negative plate is-100-0 kV.
In some embodiments of the present application, the discharge particle size of the moderate speed mill is no greater than 45 μm.
In some embodiments of the present application, the medium speed mill may be replaced with a ball mill, a rod mill, or a fan mill.
The embodiment of the invention provides a coal ash preparation system and a preparation process, and compared with the prior art, the coal ash preparation system has the beneficial effects that:
the invention provides a coal ash preparation system and a preparation process, which adopt a two-stage separation process of pulse airflow separation bed roughing and triboelectric separation fine separation to achieve multiple purposes of reducing the carbon content of the coal ash, improving the quality of the coal ash and promoting the recycling of combustible carbon. Meanwhile, considering that the original slag has the characteristics of low carbon content, coarse particle size, low economic benefit and the like, the high-value utilization of the slag is realized by grinding and grading the slag and doping the slag into the fly ash. Specifically, the invention makes up the defects of low treatment capacity, high cost and the like of the triboelectric separation by the roughing process of the pulsating airflow separation bed; the separated light product has high heat value and has circulating and blending burning value, while the fly ash product has low carbon content and higher comprehensive utilization value; the high-value utilization of the furnace slag is realized through the grinding classification and ash doping processes; and all the discharged gas of the system is treated by the cyclone classifier, so that the discharge of solid dust is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of a fly ash preparation system according to an embodiment of the present invention.
In the figure, 1, a fly ash warehouse; 2. a pulsed air flow sorting bed; 3. a first cyclone classifier; 4. a friction device; 5. a high-voltage electrostatic separator; 6. a slag store; 7. a three-way chute; 8. grinding at medium speed; 9. a second cyclone classifier; 10. a fly ash collection warehouse; 11. a slag collection reservoir; 12. a boiler.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It should be understood that the terms "front", "rear", and the like are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish one type of information from another. For example, "front" information may also be referred to as "rear" information, and "rear" information may also be referred to as "front" information without departing from the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a fly ash preparation system, which includes a fly ash storage 1, a pulsating airflow sorting bed 2, a first cyclone classifier 3, a friction device 4, a high-voltage electrostatic sorting machine 5, a slag storage 6, a three-way chute 7, a medium-speed mill 8, a second cyclone classifier 9, a slag collection storage 11 and a fly ash collection storage 10, wherein a discharge port of the fly ash storage 1 is connected to a feed port of the pulsating airflow sorting bed 2, the pulsating airflow sorting bed 2 is provided with a light product discharge port and a heavy product discharge port, wherein the light product discharge port is connected to a feed port of the friction device 4, the heavy product discharge port is connected to the fly ash collection storage 10, a discharge port of the friction device 4 is connected to a feed port of the high-voltage electrostatic sorting machine 5, the high-voltage electrostatic sorting machine 5 is provided with a negative electrode end discharge port and a positive electrode end discharge port, the negative electrode end discharge port is connected to a feed port of a boiler 12, the discharge hole of the positive electrode end is connected with a fly ash collecting warehouse 10, the top of the pulsating airflow sorting bed 2 is also provided with a gas outlet, the gas outlet is connected with a first cyclone classifier 3, the underflow hole of the first cyclone classifier 3 is also connected with the feed hole of a friction device 4, the discharge hole of a slag warehouse 6 is connected with the feed hole of a medium-speed mill 8, the discharge hole of the medium-speed mill 8 is connected with a second cyclone classifier 9, and the underflow hole of the second cyclone classifier 9 is connected with the fly ash collecting warehouse 10.
Further, the invention also provides a fly ash preparation process adopting the fly ash preparation system, which comprises the following steps:
s1, conveying the original fly ash into a fly ash warehouse;
s2, feeding the original fly ash in the fly ash warehouse into a pulsating flow separator for roughing;
s3, sending the heavy product separated by the pulsating airflow separator into a fly ash collection warehouse;
s4, sending the light products separated by the pulsating airflow separator into a friction charger for friction charging;
s5, the first cyclone classifier traps and recovers the winnowing particles of the pulsating airflow sorting bed;
s6, sending the light products subjected to friction charge of the friction device into a high-voltage electrostatic separator;
s7, sorting the light products by a high-voltage electrostatic sorting machine, gathering the products at the negative electrode end of the high-voltage electrostatic sorting machine and sending the products at the positive electrode end of the high-voltage electrostatic sorting machine into a boiler, and gathering the products at the positive electrode end of the high-voltage electrostatic sorting machine and sending the products into a fly ash collection warehouse;
s8, sending the original slag into a slag warehouse;
s9, feeding part of original slag in the slag warehouse into a medium-speed mill through a three-way chute, and feeding other original slag into a slag collection warehouse;
s10, grinding the original slag by using a medium-speed mill;
and S11, performing gas-solid separation on the medium-speed mill by using a second cyclone classifier, and conveying the ground fine-grain slag into a fly ash collection warehouse.
Based on the structure and the process, the original fly ash enters a pulsed air flow separator for roughing from a fly ash storage 1 in a pneumatic conveying mode, the separated heavy product enters a fly ash collection storage 10 and is the main source of a high-quality fly ash product, the light product enters a friction device 4 for friction charge, and the elutriation particles of a pulsed air flow separation bed 2 are captured and recovered through a first cyclone classifier 3; carbon particles and ash particles in the light products are rubbed by a friction device 4 and carry positive and negative charges respectively, after entering a high-voltage electrostatic separator 5, the carbon particles are deflected and separated in different directions under the combined action of electric field force and gravity, the carbon particles are enriched in a negative plate area, the ash particles are enriched in a positive plate area, and discharged materials in the negative plate area are used as combustible carbon products and return to a boiler 12 for combustion; on the other hand, on the one hand, the original ash is discharged from the slag warehouse 6 by gravity and is shunted by the three-way chute 7, part of the ash directly enters the slag collection warehouse 11 to be used as an ash product, the other part of the ash enters the medium-speed mill 8 to be ground and is subjected to gas-solid separation by the second cyclone classifier 9, the ground and classified fine-grain slag is mixed with the heavy product screened by the pulsating airflow sorting bed 2 and the positive end product of the high-voltage electrostatic sorting machine 5 in the fly ash collection warehouse 10, and the final high-quality fly ash product is produced.
Further, to enhance the sorting effect, in some embodiments of the present application, the pulsesThe pulsating airflow frequency range of the airflow separator is preferably 0.5-10 Hz, and the separation density is preferably 1.8-2.2 g/cm3。
Similarly, in order to improve the sorting effect, in some embodiments of the present application, the excitation voltage of the positive plate of the high-voltage electrostatic sorting machine 5 is adjusted to be in a range of 0-100 kV, and the excitation voltage of the negative plate is adjusted to be in a range of-100-0 kV.
Optionally, in order to improve the quality of the fly ash, in some embodiments of the present application, the discharge particle size of the medium-speed mill 8 is not greater than 45 μm. Meanwhile, the medium-speed mill 8 can be replaced by a ball mill, a rod mill or a fan mill and the like according to actual production and market supply conditions.
In addition, in order to ensure the final quality of the fly ash, the carbon content of the combustible carbon product in the whole process is controlled to be more than 20%, the carbon content of the high-quality fly ash is controlled to be less than 5%, and the 45-micron sieve-loading rate is not more than 10%.
In summary, the invention provides a fly ash preparation system, which comprises a fly ash warehouse, a pulsating airflow sorting bed, a first cyclone classifier, a friction device, a high-pressure electrostatic sorting machine, a slag warehouse, a three-way chute, a medium-speed mill, a second cyclone classifier, a slag collecting warehouse and a fly ash collecting warehouse, wherein a discharge port of the fly ash warehouse is connected with a feed port of the pulsating airflow sorting bed, the pulsating airflow sorting bed is provided with a light product discharge port and a heavy product discharge port, the light product discharge port is connected with a feed port of the friction device, the heavy product discharge port is connected with the fly ash collecting warehouse, a discharge port of the friction device is connected with a feed port of the high-pressure electrostatic sorting machine, the high-pressure electrostatic sorting machine is provided with a negative end discharge port and a positive end discharge port, the negative end discharge port is connected with a feed port of a boiler, the positive end discharge port is connected with the fly ash collecting warehouse, and the top of the pulsating airflow sorting bed is also provided with a gas outlet, the gas outlet is connected with a first cyclone classifier, the underflow port of the first cyclone classifier is also connected with the feeding port of the friction device, the discharge port of the slag warehouse is connected with the feeding port of the medium-speed mill, the discharge port of the medium-speed mill is connected with a second cyclone classifier, and the underflow port of the second cyclone classifier is connected with the fly ash collecting warehouse. Compared with the prior art, the fly ash preparation system is ingenious in structural design and good in sorting effect.
The invention also provides a fly ash preparation process, which adopts the fly ash preparation system and has the advantages of good separation effect and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A fly ash preparation system is characterized by comprising a fly ash warehouse, a pulsating airflow sorting bed, a first cyclone classifier, a friction device, a high-voltage electrostatic sorting machine, a slag warehouse, a three-way chute, a medium-speed mill, a second cyclone classifier, a slag collection warehouse and a fly ash collection warehouse, wherein a discharge port of the fly ash warehouse is connected with a feed port of the pulsating airflow sorting bed, the pulsating airflow sorting bed is provided with a light product discharge port and a heavy product discharge port, the light product discharge port is connected with the feed port of the friction device, the heavy product discharge port is connected with the fly ash collection warehouse, a discharge port of the friction device is connected with the feed port of the high-voltage electrostatic sorting machine, the high-voltage electrostatic sorting machine is provided with a negative electrode end discharge port and a positive electrode end discharge port, the negative electrode end discharge port is connected with a feed port of a boiler, the positive pole end discharge gate with the storehouse is collected to the fly ash is connected, the gas outlet has still been seted up at the top of pulsating gas flow sorting bed, the gas outlet with first cyclone classifier is connected, the underflow opening of first cyclone classifier is likewise with the pan feeding mouth of friction ware is connected, the discharge gate and the intermediate speed of slag storehouse are ground the pan feeding mouth and are connected, the discharge gate and the second cyclone classifier of intermediate speed mill are connected, the underflow opening of second cyclone classifier with the storehouse is collected to the fly ash and is connected.
2. A fly ash production process, which is achieved by the fly ash production system of claim 1, comprising the steps of:
s1, conveying the original fly ash into a fly ash warehouse;
s2, feeding the original fly ash in the fly ash warehouse into a pulsating flow separator for roughing;
s3, sending the heavy product separated by the pulsating airflow separator into a fly ash collection warehouse;
s4, sending the light products separated by the pulsating airflow separator into a friction charger for friction charging;
s5, the first cyclone classifier traps and recovers the winnowing particles of the pulsating airflow sorting bed;
s6, sending the light products subjected to friction charge of the friction device into a high-voltage electrostatic separator;
s7, sorting the light products by a high-voltage electrostatic sorting machine, gathering the products at the negative electrode end of the high-voltage electrostatic sorting machine and sending the products at the positive electrode end of the high-voltage electrostatic sorting machine into a boiler, and gathering the products at the positive electrode end of the high-voltage electrostatic sorting machine and sending the products into a fly ash collection warehouse;
s8, sending the original slag into a slag warehouse;
s9, feeding part of original slag in the slag warehouse into a medium-speed mill through a three-way chute, and feeding other original slag into a slag collection warehouse;
s10, grinding the original slag by using a medium-speed mill;
and S11, performing gas-solid separation on the medium-speed mill by using a second cyclone classifier, and conveying the ground fine-grain slag into a fly ash collection warehouse.
3. The fly ash preparation process of claim 2, wherein the pulsating gas flow frequency range of the pulsating gas flow separator is 0.5-10 Hz, and the separation density is 1.8-2.2 g/cm3。
4. The fly ash preparation process as claimed in claim 2, wherein the excitation voltage of the positive plate of the high-voltage electrostatic separator is 0-100 kV, and the excitation voltage of the negative plate is-100-0 kV.
5. A process for preparing fly ash according to claim 2, wherein the discharge particle size of the medium speed mill is not more than 45 μm.
6. The process for preparing fly ash according to claim 2, wherein the medium-speed mill is replaced by a ball mill, a rod mill or a fan mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111260084.9A CN114130553B (en) | 2021-10-27 | 2021-10-27 | Fly ash preparation system and preparation process |
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| CN202111260084.9A CN114130553B (en) | 2021-10-27 | 2021-10-27 | Fly ash preparation system and preparation process |
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| CN114130553A true CN114130553A (en) | 2022-03-04 |
| CN114130553B CN114130553B (en) | 2024-03-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115025751A (en) * | 2022-06-23 | 2022-09-09 | 国能国华(北京)电力研究院有限公司 | System and method for preparing adsorption material from carbon dioxide absorbent waste liquid and coal ash |
| CN115025751B (en) * | 2022-06-23 | 2023-10-27 | 国能国华(北京)电力研究院有限公司 | System and method for preparing adsorption material from carbon dioxide absorbent waste liquid and fly ash |
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| CN115911283B (en) * | 2022-11-17 | 2023-09-22 | 中国矿业大学 | Dry modification and quality improvement method for battery cathode production raw material |
| CN117000729A (en) * | 2023-09-28 | 2023-11-07 | 珙县华洁危险废物治理有限责任公司成都分公司 | Method for preparing secondary fly ash from shale gas drilling oil sludge |
| CN117000729B (en) * | 2023-09-28 | 2023-12-12 | 珙县华洁危险废物治理有限责任公司成都分公司 | Method for preparing secondary fly ash from shale gas drilling oil sludge |
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