CN104673343B - Enter classification grinding, humidifying technology that the choosing of stove coking coal machine is combined with selection by winnowing - Google Patents
Enter classification grinding, humidifying technology that the choosing of stove coking coal machine is combined with selection by winnowing Download PDFInfo
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Abstract
It is a kind of enter the stove coking coal machine classification grinding that is combined with selection by winnowing of choosing, humidifying technology, using mechanical high-amplitude screen, wet coal charge is classified as >=2 kinds of grades of 12mm and ＜ 12mm, the coal charge of ＜ 12mm is classified as≤2 kinds of grades of 5mm and ＞ 5mm into blow sorting apparatus, the coal charge of≤5mm is carried out into damping to moisture 4%~6% using damping machine, by select >=coal charge of ＞ 5mm selected of the coal charge of 12mm crushed by pulverizer after enter baffle plate type blender together with the ball coal of the dry coal after damping and Φ 3.5 and be mixed to form into stove dry coal；Its advantage is system operation reliability；Classification grinding is conducive to keeping coking property and stable yield, grading and conditioning to reduce damping machine load, energy saving；First removal of impurities and mechanical picker alleviate wind riddle load, and reduce its blocking probability, and back-mixing process is suitable for the damping of rainy season extra-high moisture coal charge；The segregation phenomena that coal charge is formed in classification, desiccant dehumidification process can be eliminated；The damping machine of various patterns can be matched.
Description
Technical field
The present invention relates to coking industry coking technology field, more particularly to it is a kind of enter stove coking coal machine choosing combined with selection by winnowing
Classification grinding, humidifying technology.
Background technology
Coal is a kind of indefinite form material, its grade（Typically press>25mm, 25~10mm, 10~5mm, 5~3mm, 3~
1.5mm, 1.5~1mm,<1mm is divided）Component ratio is different with coal, and coking industry is required into stove coking coal≤3mm grades
Ratio >=85%.The traditional Blending Program for Coke Production of coking has " first with rear powder " and " matching somebody with somebody after first powder " 2 kinds of techniques." first with rear powder " work
Although skill investment is small, there is excessive crushing phenomenon in part coal（Main influence coke quality and production capacity）, and full constituent（By grain
Level）Crush operating cost higher；" matching somebody with somebody after first powder ", although technique classification crushes controllability and selectivity preferably, has crushed cost
Decline（The category grade that carries on as before full constituent is crushed）, but invest higher.
Coking coal humidifying technology (CMC) refers to " control of coking charge moisture content of coal " technique, and general principle is by coal for coking
It is thermally dried and partially dehydrated using outer heat before shove charge, realizes coal charge moisture regulation；According to the requirement of current coke making process
Moisture in coal control 6%~9%, so as to realize reducing coking heat consumption, improve coke quality（Or increase weak caking coal is matched somebody with somebody
Enter amount to improve coal for coking resource structures, and then reduce coal blending cost）, reduce coke plant wastewater amount, improve single oven coke carbon yield
（The reduction of feeding density moisture content of coal, dump increase in density；As-fired coal moisture stabilization, is conducive to coke oven stable yields）Purpose.
There is negative correlativing relation in coal charge moisture distribution and granularity, surmise bigger, and its moisture is lower；Typically enter stove coking coal in
>=5mm material level components account for 60% or so and moisture≤6%, and this part coal charge need not enter humidity control device completely.Traditional coal damping
Technology is general to full constituent mixed coal（Size-reduced mistake）Damping control water is carried out, causes humidity control device load excessive, on the one hand
Make damping machine bulky, take up an area many；The another aspect energy（Heating heat energy, mechanical electric energy）Wasting phenomenon is protruded and run into
This is higher.
Enter the traditional selection by winnowing grading technology of stove coking coal materials and use blow sorting apparatus.Because in coal charge >=that 10mm there are about 26% is left
The right side, also contains the debris such as ironware, concrete block, straw, branch（Matter）, these debris（Matter）Easily cause screening machine to block and influence life
Produce.
The content of the invention
It is an object of the invention to provide entering stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing
Solution of the invention is such：
It is a kind of enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, including step：
（1）Classification step：Comprise the following steps：
（A）Mechanical classification step：Use be suitable for moisture for 0%~20% moist fine particulate level≤25mm viscous material it
High-amplitude screen, wet coal charge is classified as >=2 kinds of grades of 12mm and ＜ 12mm, the coal charge of >=12mm deliver to pulverizer be crushed to≤
3mm；
（B）Selection by winnowing secondary grading step：The coal charge of the ＜ 12mm that mechanical classification is obtained carries out two into blow sorting apparatus
Secondary classification, is classified as≤2 kinds of grades of 5mm and ＞ 5mm；The coal charge of≤5mm and moisture content >=11.5% enters damping machine, ＞ 5mm
Coal charge deliver to pulverizer and be crushed to≤3mm；
（2）Damping step：By obtained by the secondary grading of selection by winnowing≤5mm and moisture content coal charge higher uses damping
Machine carries out damping to moisture 4%~6%；
（3）Enter stove dry coal preparation steps：Mechanical classification is sub-elected the >=＞ that sub-elects of the coal charge of 12mm and secondary grading
The coal charge of moisture content 4%~6% enters together with the ball coal of the dry coal after damping and Φ 3.5 after the coal charge of 5mm is crushed by pulverizer
Baffle plate type blender is mixed to form into stove dry coal, and it is fed back by on-line checking baffle plate type mixer outlet coal charge moisture
Control blow sorting apparatus sieve ratio, and then control damping machine treating capacity and damping machine outlet dry coal moisture, finally ensure baffling
Board-like mixer outlet coal charge moisture, is allowed to homogeneous and stabilization 6%~9%.
More specifically technical scheme also includes：In the mechanical classification step, mechanical classification selects mass of vibration with removal of impurities
Small but amplitude up to 30mm, granularity can be sieved there is automatically cleaning for 8~35mm, compass screen surface are combined by fixed grit and movable screen cloth
The high-amplitude screen of function, >=2 kinds of grades of 12mm and ＜ 12mm are classified as by wet coal charge.
Further：In the secondary grading step, the 27000Pa Air Fluidizeds sent using fluidized air blower are divided
Level, be classified as≤2 kinds of grades of 5mm and ＞ 5mm, at the same time, by controlling blow sorting apparatus operating parameter, can adjust this 2
It is≤5mm to plant the ratio of grade coal charge：＞ 5mm=1~100, and then finally control baffling mixing fed to boiler moisture content of coal stabilization exists
6%~9%.
Further：In the damping step ,≤5mm and moisture content coal charge higher using low-pressure steam swinging or
The damping machine of the type of flue gases of cock oven fluid bed or internal-heating type forced heat transferring fluidized bed carries out damping to moisture 4%~6%.
Further：In the damping step, damping machine exhaust outlet dust gas out be again heated to 90 DEG C~
Purified by pocket type electrostatic hot precipitator after 110 DEG C, deduster bottom dust is pressed into the ball coal of Φ 3.5 through mechanical ball press.
Further：Also include back-mixing step：As wet cooperation moisture content of coal ＞ 14%, the outlet of automatic humidity-regulating machine cuts certain ratio
Mixing before the dry coal of example to mechanical classification sieve, it is ensured that the coal charge moisture into device stablizes prescribed limit 7%~9% relatively.
Further：Also include coal charge just removal step：By wet mixed coal feeding indefinite form material from cleaning revolution briar tooth
Formula de-burring machine carries out removal of impurities to coal charge.
It is an advantage of the invention that：
1st, engineering capital investment is saved；
2nd, simple system, reliable；
3rd, wind riddle is adjustable to grade ratio, and coal charge moisture and the adjustable controllability of granularity are good, are more beneficial for equilibrium product matter
Amount and Relationship with Yield；
4th, classification grinding can avoid coal charge from excessively crushing, and be conducive to keeping its coking property and stable yield, can also be effective
Control dust yield and saving electric energy.
5th, grading and conditioning reduces damping machine load, without complementary heating, energy saving；
6th, first removal of impurities and mechanical picker alleviate wind riddle load, and reduce its blocking probability, and save electric energy；
7th, the design of back-mixing process improves device production stability, is suitable for the damping of rainy season extra-high moisture coal charge；
8th, deduster reclaim coal dust pressure ball after can prevent reentrainment of dust, after crushing after wet coal, damping dry coal and compacting after ball
Coal is closed through baffling mixer, can eliminate the segregation phenomena that coal charge is formed in classification, desiccant dehumidification process.
9th, this technique is unrestricted to damping type formula, can flexibly match low-pressure steam swinging or coke oven flue air-flow
Change the damping machine of the types such as bed or internal-heating type forced heat transferring fluidized bed.
Brief description of the drawings
Fig. 1 is the process frame chart that the embodiment of the present invention is used.
Specific embodiment
The present invention comprises the following steps：Coarse granule powder after coal charge just removal of impurities, mechanical classification and removal of impurities, selection by winnowing classification, classification
Coal charge mixes with coal charge after damping and anti-excessively wet coal influence production is steady after fine grained damping, system dust removing, crushing after broken, classification
Fixed back-mixing totally 8 steps.Coal charge just removal of impurities is using indefinite form material from the cleaning tooth-like de-burring machine of rotary hook；Granularity uses high-amplitude
Two grades of hierarchical approaches control that mechanical picker and blow sorting apparatus are combined；Coarse granule coal charge after classification uses general coal pulverizer
Crush（To≤3mm）, fine grained（≤5mm）Coal charge regulates and controls coal charge moisture using coal damping machine；According to dust water content and distribution
Feature, system dust removing is divided into damping dedusting（Damping machine exhaust outlet）And environmental dust removal（Pulverizer, mechanical picker, blow sorting apparatus row
Gas port, head of belt conveyer, mechanical ball press etc.）2 parts, with mechanical pressure ball after being collected using pocket type electrostatic precipitator
Mechanism shaped coal；Moulded coal is mixed to form through baffling mixer after fine grained dry coal, compacting after the wet coal of fine grained and damping after crushing
As-fired coal.
The technique according to Fig. 1, specific embodiment is as follows：
1st, first removal of impurities is using indefinite form material from the cleaning tooth-like de-burring machine of rotary hook.
2nd, mechanical classification and removal of impurities from mass of vibration is small but amplitude up to 30mm, granularity can be sieved for 8mm~35mm, sieve
Face is combined by fixed grit and movable screen cloth and has self-cleaning function to be suitable for the moist fine particulate level that moisture is 0%~20%
（Typically≤25mm）The high-amplitude screen of viscous material, wet coal charge is classified as >=2 kinds of grades of 12mm and ＜ 12mm.The coal of >=12mm
Certainly flow to pulverizer is crushed to≤3mm to material, and the coal charge of ＜ 12mm carries out secondary grading into blow sorting apparatus.
3rd, after the coal charge of ＜ 12mm enters selection by winnowing screening, 27000Pa Air Fluidizeds that blower fan sends are fluidized and are classified as
2 kinds of grades of≤5mm and ＞ 5mm, at the same time, by controlling blow sorting apparatus operating parameter, can adjust 2 kinds of sized coals
The ratio of material（≤5mm：＞ 5mm=1~100）, and then final control baffling mixing fed to boiler moisture content of coal（6%~9%）.＞ 5mm
Coal charge be crushed to≤3mm from flowing to pulverizer ,≤5mm and moisture content coal charge higher enters damping machine.
4th ,≤5mm and moisture content coal charge higher can use low-pressure steam swinging, flue gases of cock oven fluid bed, interior heat
The damping machine of the types such as formula forced heat transferring fluidized bed carries out damping to moisture 4%~6%.
5th, pulverizer, blow sorting apparatus exhaust outlet, each head of belt conveyer, mechanical ball press etc. dust gas are by bag
Formula electrostatic environment deduster collection and purification, deduster bottom dust is pressed into the ball coal of Φ through mechanical ball press；It is anti-condensation, damping
Machine exhaust outlet dust gas out is reheated after device is heated to 90 DEG C~110 DEG C and is purified by pocket type electrostatic hot precipitator, removes
Dirt device bottom dust is equally pressed into the ball coal of Φ 3.5 through mechanical ball press.
6th, it is the segregation problems that solution fine coal is likely to occur in grouping process, wet coal charge after crushing（4%~6%）With damping
Dry coal and the ball coal of Φ 3.5 afterwards enters baffle plate type blender and is mixed to form into stove dry coal by on-line checking deflection plate together
Formula mixer outlet coal charge moisture carrys out feedback controls blow sorting apparatus screening ratio, and then controls damping machine dry coal amount and damping machine
Outlet dry coal moisture, finally ensures baffle plate type mixer outlet moisture stabilization, had both made as-fired coal moisture homogeneous and stabilization is 6%
~9%, also ensure that coal charge other physical and chemical indexes are homogeneous and prevent from influenceing coking behavior.
It is of the invention that production stabilization is influenceed for the coal charge moisture for preventing rainy season from entering device is too high, devise back-mixing technique.
When moisture content of coal ＞ 14% is carried out, the outlet of automatic humidity-regulating machine cuts mixing before a certain proportion of dry coal to mechanical classification sieve, it is ensured that enter dress
The coal charge moisture put is stablized in prescribed limit relatively.
Claims (7)
1. it is a kind of enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, it is characterised in that：Including step：
（1）Classification step：Comprise the following steps：
（A）Mechanical classification step：Use that to be suitable for moisture be the high-amplitude of the viscous material of 0%~20% moist fine particulate level≤25mm
Sieve, wet coal charge is classified as >=2 kinds of grades of 12mm and ＜ 12mm, and the coal charge of >=12mm delivers to pulverizer and is crushed to≤3mm；
（B）Selection by winnowing secondary grading step：The coal charge of the ＜ 12mm that mechanical classification is obtained carries out secondary point into blow sorting apparatus
Level, is classified as≤2 kinds of grades of 5mm and ＞ 5mm；The coal charge of≤5mm and moisture content >=11.5% enters damping machine, the coal of ＞ 5mm
Material delivers to pulverizer and is crushed to≤3mm；
（2）Damping step：By obtained by the secondary grading of selection by winnowing≤5mm and moisture content coal charge higher entered using damping machine
Row damping is to moisture 4%~6%；
（3）Enter stove dry coal preparation steps：Mechanical classification is sub-elected >=the ＞ 5mm that sub-elect of the coal charge of 12mm and secondary grading
The coal charge of moisture content 4%~6% enters baffle plate type together with the ball coal of the dry coal after damping and Φ 3.5 after coal charge is crushed by pulverizer
Blender is mixed to form into stove dry coal, and it is by on-line checking baffle plate type mixer outlet coal charge moisture come feedback controls selection by winnowing
Screening machine sieves ratio, and then controls damping machine treatment coal amount and damping machine outlet dry coal moisture, finally ensures that baffle plate type is mixed
Clutch exports coal charge moisture, is allowed to homogeneous and stabilization 6%~9%.
2. it is according to claim 1 enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, its feature exists
In：In the mechanical classification step, mechanical classification and removal of impurities from mass of vibration is small but amplitude up to 30mm, granularity can be sieved be
8mm~35mm, compass screen surface are combined by fixed grit and movable screen cloth and have the high-amplitude screen of self-cleaning function, by the classification of wet coal charge
It is >=2 kinds of grades of 12mm and ＜ 12mm.
3. it is according to claim 1 enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, its feature exists
In：In the secondary grading step, the 27000Pa air sent using fluidized air blower carries out fluidized classification, be classified as≤5mm and
2 kinds of grades of ＞ 5mm, at the same time, by controlling blow sorting apparatus operating parameter, can adjust 2 kinds of ratios of grade coal charge
It is≤5mm：＞ 5mm=1~100, and then final control baffling mixing fed to boiler moisture content of coal stabilization is 6%~9%.
4. it is according to claim 1 enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, its feature exists
In：In the damping step ,≤5mm and moisture content coal charge higher are fluidized using low-pressure steam swinging or flue gases of cock oven
The damping machine of the type of bed or internal-heating type forced heat transferring fluidized bed carries out damping to moisture 3%~5%.
5. classification grinding, humidifying technology that the choosing of stove coking coal machine is combined with selection by winnowing are entered according to claim 1 or 4, it is special
Levy and be：In the damping step, by bag after carrying out being again heated to 90 DEG C~110 DEG C to damping machine exhaust outlet dust gas out
Formula electrostatic hot precipitator is purified, and deduster bottom dust is pressed into the ball coal of Φ 3.5 through mechanical ball press.
6. it is according to claim 1 enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, its feature exists
In：Also include back-mixing step：When wet cooperation moisture content of coal is more than ＞ 14%, the outlet of automatic humidity-regulating machine cuts a certain proportion of dry coal extremely
Mixing before mechanical classification sieve, it is ensured that the coal charge moisture into device stablizes prescribed limit 6%~9% relatively.
7. it is according to claim 1 enter stove coking coal machine the choosing classification grinding, the humidifying technology that are combined with selection by winnowing, its feature exists
In：Also include coal charge just removal step：By wet mixed coal feeding indefinite form material from the cleaning tooth-like de-burring machine of rotary hook to coal charge
Carry out removal of impurities.
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| CN108117879A (en) * | 2016-11-28 | 2018-06-05 | 宝山钢铁股份有限公司 | The blending method that a kind of part moisture-control grading crushes |
| CN109663447B (en) * | 2019-02-21 | 2024-03-08 | 唐山神州机械集团有限公司 | Underground dry separation system and method based on circulating air flow |
| CN110305679B (en) * | 2019-04-12 | 2021-04-27 | 武汉钢铁有限公司 | Dry and wet coal mixing coking method capable of stabilizing dry coal throughput |
| CN112090763A (en) * | 2020-11-09 | 2020-12-18 | 天津美腾科技股份有限公司 | Air screening separation device and air screening separation method |
| CN113941451A (en) * | 2021-10-19 | 2022-01-18 | 柳晶科技集团(常州)股份有限公司 | Method for electrostatic separation casting of coal dust in fly ash |
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| CN1100112C (en) * | 2000-09-22 | 2003-01-29 | 冶金工业部鞍山热能研究院 | Hot air blowing coking coal grading and moisture controlled coal preparation process |
| CN101906310B (en) * | 2010-09-09 | 2013-01-02 | 武汉钢铁(集团)公司 | Method for drying coking coal materials |
| CN103710038B (en) * | 2013-12-23 | 2014-12-03 | 青岛利物浦环保科技有限公司 | Coal-moisture-control, separation and winnowing machine for composite fluidized bed and moisture-control process |
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