CN105013596B - Device and process for sorting difficult-to-grind mineral substances in cyclic load of coal mill - Google Patents
Device and process for sorting difficult-to-grind mineral substances in cyclic load of coal mill Download PDFInfo
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- CN105013596B CN105013596B CN201510412568.9A CN201510412568A CN105013596B CN 105013596 B CN105013596 B CN 105013596B CN 201510412568 A CN201510412568 A CN 201510412568A CN 105013596 B CN105013596 B CN 105013596B
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- 239000003245 coal Substances 0.000 title claims abstract description 67
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 15
- 239000011707 mineral Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000008569 process Effects 0.000 title claims abstract description 11
- 239000000126 substance Substances 0.000 title claims description 33
- 125000004122 cyclic group Chemical group 0.000 title abstract 2
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims description 25
- 238000011144 upstream manufacturing Methods 0.000 claims description 14
- 239000002817 coal dust Substances 0.000 claims description 12
- 230000010349 pulsation Effects 0.000 claims description 8
- 239000002801 charged material Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- 239000011028 pyrite Substances 0.000 description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Combined Means For Separation Of Solids (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a sorting device and a sorting process for difficult-to-grind minerals in cyclic load of a coal mill, wherein an outlet at the lower end of a coal powder separator of the coal mill in the device is connected with an inlet of a collecting device, an outlet of the collecting device is connected with a feed inlet of an active airflow dry sorting device through a pipeline, the bottom of the active airflow dry sorting device is provided with a sorting medium inlet end and a difficult-to-grind mineral discharge outlet, the top of the active airflow dry sorting device is provided with a coal powder particle outlet, the sorting medium inlet end is connected with a sorting medium source, the difficult-to-grind mineral discharge outlet discharges the difficult-to-grind minerals, the coal powder particle outlet is connected with a feed end of a cyclone separator, a discharge end of the cyclone separator is connected with the inlet of the coal feeder, an outlet of the coal feeder is connected with the coal mill, and. The process of the device realizes the integration of grinding, sorting and grading, and finally achieves the aims of reducing the circulation rate and the grinding energy consumption, reducing the equipment abrasion and the boiler corrosion, improving the operation efficiency and reducing the pollution emission.
Description
Technical field
Patent of the present invention is related to a kind of sorting unit and technique for handling difficult ore grinding substance in medium-speed pulverizer circulating load
Flow by the way that dry separation technique is embedded in grinding machine pulverized coal preparation system, is realized to difficult ore grinding substance in coal pulverizer circulating load
Removal reduces coal pulverizer circulating ratio and grinding energy consumption, reduces the abrasion of Grinding structural unit and the corrosion of boiler, improves coal-burning power plant
Coal-grinding pulverized coal preparation system operational efficiency.
Background technology
The fuel Policy Conditions station boiler in China is based on fire coal, and main burning inferior coal, ash content 30~
Between 40%.The mineral such as pyrite, quartz are associated in colm, since hardness is higher, scrap rates are slow compared with coal particles.
Industrial medium-speed pulverizer perforate sampling researches show that：The minerals of association are ground repeatedly in grinding machine in coal, cause Xun Huan times
Rate is up to 8~12, i.e., on the premise of pulverizer adequacy is 30t/h, grinding machine actual grinding mass flow is up to 240~360t/h；
Higher circulating ratio causes the 0.5~2% of factory's gross generation to be consumed by medium-speed pulverizer；Power plant's operational efficiency is relatively low, average
Coal consumption for power generation is higher by about 90 grams/kilowatt hour up to 327 grams/kilowatt hour compared with advanced international standard.In addition to the influence to process of lapping,
The minerals fine powder of dissociation enters boiler combustion, reduces boiler combustion efficiency, increases pollutant emission.Using sulfur dioxide as
Example, the discharge capacity of annual coal-burning power plant's sulfur dioxide account for the 45% of national total emission volumn more than 7,500,000 tons.Although each power plant
Desulfurization machine set is had been equipped with, but rate and inorganic sulphur content gradually rises the comprehensive effect with coal-burning power plant's burning inferior coal in coal in China
Under, the operating pressure multiplication of desulfurization machine set.If firing sulfur content of coal reduces by 20%, discharge sulfur dioxide 1,500,000 can be reduced every year
Ton saves the operating cost of desulfurization machine set.In addition, pyrite will additionally generate roasting slag attachment and is affixed in burner hearth after combustion
Wall influences efficiency of combustion and the service life of boiler.
Although part minerals in coal can be removed by washing, remained in the mineral of fine grained dip dyeing association state
In coal particle.Under the abrasive action of medium-speed pulverizer, particulate associated mineral is progressively dissociated into monomer, but due to its granularity not
Meet the fineness requirement of combustion power generation, eventually become circulating load and repeatedly ground in grinding machine.It has been dissociated in circulating load
Minerals monomer can be removed by way of physical separation, yet with the limitation of power plant's worker's professional knowledge, although at present
Have the ripe dry separation technique such as active pulsating air flow, friction electrical selection, vibrated fluidized bed, but there is no in circulating load
The report of difficult ore grinding substance processing.Simultaneously because the working environment of coal-burning power plant's medium-speed pulverizer inner sealing complexity, circulating load
It can not directly handle and sorting need to be drawn, this is also faced with larger operation problem.Therefore, by sorting process and fire coal electricity
The existing flouring technology of factory is combined, and while difficult ore grinding substance removal in being intended to realization circulating load, weakens it to follow-up
The harm that grinding and burning link generate is finally reached the purpose of energy-saving and emission-reduction.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention is provided in a kind of coal pulverizer circulating load
Difficult ore grinding sorting substances device and sorting process realize grinding-sorting-classification integration of pulverized coal preparation system, are finally reached drop
Low circulation multiplying power and grinding energy consumption, reduce equipment attrition and boiler corrosion, and then improve operational efficiency, reduce the mesh of disposal of pollutants
's.
Technical solution：To achieve the above object, the technical solution adopted by the present invention is：
Difficult ore grinding sorting substances device in coal pulverizer circulating load, including coal pulverizer, coal dust seperator, collection device, pipe
Road, active pulsating air flow dry separation device, cyclone separator and feeder are brought out under the coal dust seperator of the coal pulverizer
Mouth is connected with the entrance of collection device, and the outlet of the collection device passes through pipeline and active pulsating air flow dry separation device
Feed inlet connects, and the bottom of the active pulsating air flow dry separation device is provided with separating medium upstream end and difficult ore grinding substance
Discharge gate, top are provided with pulverized coal particle outlet, and the separating medium upstream end is connected with separating medium source, the pulverized coal particle
Outlet is connected with the feed end of cyclone separator, and the discharge end of the cyclone separator is connected with feeder entrance, described to give coal
The outlet of machine is connected with coal pulverizer.
Preferably, the separating medium source is provided for oneself including coal-burning power plant's fan, a wind pipe or separation system to wind
Machine, corresponding separating medium upstream end be to wind upstream end, a wind pipe entrance or separation system provide for oneself fan into
Enter end.
Further, the coal-burning power plant is provided with pulsation valve, vortex-shedding meter to wind end and power plant's wind regime junction
And rotary switch.
Further, it is provided with pipeline valve on the pipeline.
The sorting process of difficult ore grinding sorting substances device, step are as follows in coal pulverizer circulating load：
Step 1：Circulating load in the coal dust seperator of the coal pulverizer after collection device recycles, by pipeline into
Enter sustainer take offence stream dry separation device in, realize the sorting of circulating load；
Step 2：In assorting room, pipeline valve, pulsation valve and rotary switch are adjusted respectively, it is suitable to meet respectively
Feeding coal, to wind velocity and ripple frequency, realize that circulating load isolates difficult ore grinding substance and pulverized coal particle by density variation；
Step 3：The pulverized coal particle enters to feeder after cyclone collection, and then enters with new charged material
Coal pulverizer is regrinded；The hardly possible ore grinding substance discharge from difficult ore grinding substance discharge gate, and minerals are rich according to difficult ore grinding substance
Property carries out corresponding secondary use.
Advantageous effect：The present invention is based on difficult ore grinding sorting substances in coal dust classifier circulating load in medium-speed pulverizer
Technology by the way that the circulating load being in high-temperature and high-pressure enclosing grinding machine is led to active pulsating air flow dry separation system, makes difficulty
Ore grinding substance and pulverized coal particle are separated according to density variation, and the light product after separation is regrinded coal pulverizer is returned until meeting
The granularity requirements of boiler；Compared with not sorted circulating load, the removal of difficult ore grinding substance, which can effectively improve, treats grind materials
Property, reduce the hardness of material and reach needed for release mesh crush number, reduce circulating ratio and power generation energy consumption, finally
It realizes and improves operational efficiency, reduces equipment attrition and corrosion.The qualified coal dust of the sorted difficult ore grinding substance of removal pyrite etc. into
Enter boiler combustion, the discharge of the pollutants such as sulfur dioxide, nitrogen oxides can be reduced, achieved energy-saving and emission reduction purposes.With fire coal electricity
Traditional grinding-the grading technology of factory's pulverized coal preparation system is compared, and the addition of this sorting process has the following advantages that：
1. being sorted by active pulsating air flow dry separation device to circulating load in medium-speed pulverizer, ensureing gently
On the premise of product combustible recovery, difficult ore grinding substance is removed, reduces its negative influence to grinding and combustion process, and most
It achieves energy-saving and emission reduction purposes eventually；
2. technological process of the present invention is simple, flexibly, sorting unit can make full use of the existing air supply system of power plant and
Without additionally configuring, operating cost is low.
Description of the drawings
Fig. 1 is the structure diagram of apparatus of the present invention.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
It is as shown in Figure 1 difficult ore grinding sorting substances device in a kind of coal pulverizer circulating load, including coal pulverizer 1, coal dust point
It disembarks 2, collection device 3, pipeline 4, active pulsating air flow dry separation device 6, cyclone separator 10 and feeder 11, the mill
The lower end outlet of the coal dust seperator 2 of coal machine 1 is connected with the entrance of collection device 3, and the outlet of the collection device 3 passes through pipeline
4 are connected with the feed inlet of active pulsating air flow dry separation device 6, the bottom of the active pulsating air flow dry separation device 6
Be provided with separating medium upstream end and difficult ore grinding substance discharge gate A, top is provided with pulverized coal particle outlet, the separating medium into
Enter end to be connected with separating medium source, the pulverized coal particle outlet is connected with the feed end of cyclone separator 10, the cyclonic separation
The discharge end of device 10 is connected with 11 entrance of feeder, and the outlet of the feeder 11 is connected with coal pulverizer 1.
In the present invention, it is preferred that the separating medium source includes coal-burning power plant's fan, a wind pipe or separation system
Provide fan for oneself, corresponding separating medium upstream end is to be provided for oneself to wind upstream end, a wind pipe entrance or separation system
Fan upstream end.Further design, in coal-burning power plant's fan with being provided with pulsation valve to wind upstream end junction
7th, vortex-shedding meter 8 and rotary switch 9 are provided with pipeline valve 5 on the pipeline 4.Pipeline valve 5, pulsation valve 7 and rotation
It turns on pass 9 and meets optimal feeding coal respectively, to wind velocity and ripple frequency, realize that circulating load isolates difficulty by density variation
Ore grinding substance and pulverized coal particle.
Specific embodiment sorting step is as follows：
Step 1：Circulating load in the coal dust seperator 2 of the coal pulverizer 1 passes through pipeline after the recycling of collection device 3
4 enter in active pulsating air flow dry separation device 6, realize the sorting of circulating load；
Step 2：In assorting room, pipeline valve 5, pulsation valve 7 and rotary switch 9 are adjusted respectively, it is suitable to meet respectively
Feeding coal, to wind velocity and ripple frequency, realize that circulating load isolates difficult ore grinding substance and pulverized coal particle by density variation；
Step 3：The pulverized coal particle enters to feeder 11 after the collection of cyclone separator 10, and then with new charged material
It is regrinded into grinding machine；The hardly possible ore grinding substance is discharged from difficult ore grinding substance discharge gate A, and minerals are rich according to difficult ore grinding substance
Property carry out corresponding secondary use.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. difficult ore grinding sorting substances device in coal pulverizer circulating load, it is characterised in that：Including coal pulverizer (1), coal dust seperator
(2), collection device (3), pipeline (4), active pulsating air flow dry separation device (6), cyclone separator (10) and feeder
(11), the lower end outlet of the coal dust seperator (2) of the coal pulverizer (1) is connected with the entrance of collection device (3), described to collect dress
The outlet for putting (3) is connected by pipeline (4) with the feed inlet of active pulsating air flow dry separation device (6), the active pulsation
The bottom of air-flow dry separation device (6) is provided with separating medium upstream end and difficult ore grinding substance discharge gate (A), and top is provided with
Pulverized coal particle exports, and the separating medium upstream end is connected with separating medium source, the pulverized coal particle outlet and cyclone separator
(10) feed end connection, the discharge end of the cyclone separator (10) are connected with feeder (11) entrance, the feeder
(11) outlet is connected with coal pulverizer (1)；
The separating medium source provides fan for oneself including coal-burning power plant's fan, a wind pipe or separation system, corresponds to therewith
Separating medium upstream end be to wind upstream end, a wind pipe entrance or separation system to provide fan upstream end for oneself；
Coal-burning power plant's fan is provided with pulsation valve (7), vortex-shedding meter (8) and rotation with power plant's wind regime junction and opens
It closes (9)；
Pipeline valve (5) is provided on the pipeline (4).
2. the sorting process of difficult ore grinding sorting substances device in coal pulverizer circulating load, which is characterized in that step is as follows：
Step 1：Circulating load in the coal dust seperator (2) of the coal pulverizer (1) passes through pipe after collection device (3) recycling
Road (4) enters in active pulsating air flow dry separation device (6), realizes the sorting of circulating load；
Step 2：In assorting room, pipeline valve (5), pulsation valve (7) and rotary switch (9) are adjusted respectively, are met respectively suitable
Suitable feeding coal, to wind velocity and ripple frequency, realize that circulating load isolates difficult ore grinding substance and coal dust by density variation
Grain；
Step 3：The pulverized coal particle enters to feeder (11) after cyclone separator (10) collection, and then with new charged material
It is regrinded into coal pulverizer (1)；The hardly possible ore grinding substance is discharged from difficult ore grinding substance discharge gate (A), according to the richness of difficult ore grinding substance
Property containing minerals carries out corresponding secondary use.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510412568.9A CN105013596B (en) | 2015-07-14 | 2015-07-14 | Device and process for sorting difficult-to-grind mineral substances in cyclic load of coal mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510412568.9A CN105013596B (en) | 2015-07-14 | 2015-07-14 | Device and process for sorting difficult-to-grind mineral substances in cyclic load of coal mill |
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| CN105013596A CN105013596A (en) | 2015-11-04 |
| CN105013596B true CN105013596B (en) | 2018-05-25 |
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| CN201510412568.9A Active CN105013596B (en) | 2015-07-14 | 2015-07-14 | Device and process for sorting difficult-to-grind mineral substances in cyclic load of coal mill |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110404650B (en) * | 2019-07-04 | 2021-04-27 | 国能绿色能源股份有限公司 | Coal grinding system and method for safely and efficiently preparing lignite |
| CN112536133B (en) * | 2020-11-19 | 2022-03-11 | 中国矿业大学 | Coal-fired power plant medium-speed coal mill internal circulation material ash-reducing quality-improving pulverizing system and process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88101496A (en) * | 1987-03-24 | 1988-10-05 | 三菱重工业株式会社 | Roller pulverizer |
| CN101987311A (en) * | 2009-08-01 | 2011-03-23 | 王华业 | Joint grinding process of FPP mill |
| CN103100483A (en) * | 2013-02-05 | 2013-05-15 | 中国矿业大学(北京) | Fine stuff material separation and classifying device |
| CN203253480U (en) * | 2013-04-03 | 2013-10-30 | 潍坊洁佳化工有限公司 | Silicon dioxide crusher |
| CN103521334A (en) * | 2013-10-10 | 2014-01-22 | 徐州天正活性炭厂 | Active carbon dust-free grinding device and method |
| CN204254653U (en) * | 2014-08-29 | 2015-04-08 | 中国华电集团科学技术研究总院有限公司 | Dry desulfurization deliming system before thermal power plant's raw coal stove |
-
2015
- 2015-07-14 CN CN201510412568.9A patent/CN105013596B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88101496A (en) * | 1987-03-24 | 1988-10-05 | 三菱重工业株式会社 | Roller pulverizer |
| CN101987311A (en) * | 2009-08-01 | 2011-03-23 | 王华业 | Joint grinding process of FPP mill |
| CN103100483A (en) * | 2013-02-05 | 2013-05-15 | 中国矿业大学(北京) | Fine stuff material separation and classifying device |
| CN203253480U (en) * | 2013-04-03 | 2013-10-30 | 潍坊洁佳化工有限公司 | Silicon dioxide crusher |
| CN103521334A (en) * | 2013-10-10 | 2014-01-22 | 徐州天正活性炭厂 | Active carbon dust-free grinding device and method |
| CN204254653U (en) * | 2014-08-29 | 2015-04-08 | 中国华电集团科学技术研究总院有限公司 | Dry desulfurization deliming system before thermal power plant's raw coal stove |
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