CN103173259B - Raw coal preheating and dehydrating technology for blast furnace coal injection - Google Patents
Raw coal preheating and dehydrating technology for blast furnace coal injection Download PDFInfo
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- CN103173259B CN103173259B CN201310127972.2A CN201310127972A CN103173259B CN 103173259 B CN103173259 B CN 103173259B CN 201310127972 A CN201310127972 A CN 201310127972A CN 103173259 B CN103173259 B CN 103173259B
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Abstract
The invention relates to a raw coal preheating and dehydrating technology for blast furnace coal injection and belongs to the technical field of blast furnace iron making and coal injection. The technology comprises the following steps of: arranging a new drying bin or transforming a conventional coal storage bin into the drying bin, dehydrating raw coal in a silo for the first time and dehydrating in the drying bin for the second time. The technology has the advantages that the raw coal is dehydrated step by step by completely adopting industrial waste gas, complete equipment runs in a negative pressure environment, the maximum capacity of the equipment is fully exerted under the condition of a conventional coal mill, the operating time of the equipment is reduced, and the maintenance frequency of the equipment is reduced while energy sources are saved.
Description
Technical field
The invention belongs to blast furnace ironmaking coal powder injection technical field, particularly a kind of for pulverized coal injection raw coal preheating dewatering process.A kind of technological method that carries out preheating dehydration mainly for the higher raw coal of water content.
Background technology
In blast furnace iron-making process, adopt the method for coal injection to replace part of coke that the effect of heat and reductive agent is provided, thereby reduction coke ratio, reduce pig iron cost, so far existing semicentennial history, the overwhelming majority's blast furnace is still also adopting coal-injection process in the world at present, and its economic benefit is approved.
In blast furnace PCI technology, the efficiency of powder process link coal pulverizer and effect directly have influence on can continue for blast furnace provides qualified coal dust, raw coal water content restricts the actual of coal pulverizer and exerts oneself.Under the condition that is 10% at former moisture content of coal, moisture reduces 1 percentage point, coal pulverizer output rises approximately 1.4 percentage points, especially the in the situation that of raw coal air storage, due to impacts such as continuing precipitations, former moisture content of coal will reach more than 20%, and now moisture reduces 1 percentage point, and coal pulverizer output rises approximately 2.5 percentage points.And former moisture content of coal reduces the maintenance cost that is conducive to reduce coal pulverizer equipment, very favourable to blast furnace PCI technology powder process link.
At present, the raw coal drying process having adopted has vibrations to roll fluidized drying technical matters, roller drying technique, SJ-IV low-temperature pyrolysis furnaceman skill, three sections of furnaceman's skills and microwave drying technology etc., but mostly complex process, efficiency is lower, economic benefit is not high.Especially on thermal source is selected, need newly-built heating furnace device or adopt electric energy heating, increase investment more, therefore there is no large-area applications, especially there is no other precedents in pulverized coal injection field.
The positive effect dewatering to pulverized coal injection in view of raw coal preheating, and drying dehydration process was not strong to pulverized coal injection field specific aim in the past, the inventor is based on pulverized coal injection field manufactured and designed to practical experience and expertise, in conjunction with iron and steel enterprise's feature, innovative design goes out a kind of for pulverized coal injection raw coal preheating dewatering process, to reaching iron and steel enterprise's UTILIZATION OF VESIDUAL HEAT IN, improve output, reduce costs and reduce the object of maintenance of the equipment.
Summary of the invention
The object of the present invention is to provide a kind of for pulverized coal injection raw coal preheating dewatering process.Solve the too high or complex process of the investment existing in existing raw coal preheating dehydration technique, and failed effectively to utilize the problems such as the useless flue gas of iron and steel enterprise.
For solving the problems of the technologies described above, concrete technology step is as follows:
(1) the newly-built coal storage silo that maybe will have transform dryness storehouse 3 as, silo 3 is connected by seal for pipe joints with gas inlet and the discharge of fly-ash separator 1, make fly-ash separator 1 can receive the coal dust of dry carrier gas from taking away in silo 3, and the coal dust of collecting is returned to silo 3; And on the pipeline being connected with the discharge of fly-ash separator 1 at silo 3, star-like dumper 6 is set, prevent the dry reverse inflow fly-ash separator 1 of carrier gas; The emission gases outlet of fly-ash separator 1 is connected with the inlet seal of exhaust blower 2, makes the interior formation negative pressure of silo 3; The former coal export of silo 3 is connected by sealing chute with the opening for feed of drying cylinder 4; And in drying cylinder 4, be provided with the dry carrier gas channel 5 of carrier gas arm 8;
(2) raw coal transportation is to silo 3, silo 3 interior by raw coal moisture drying to≤12wt%, complete drying and dehydrating 1 time;
(3) raw coal that completes 1 drying and dehydrating is under the effect of gravity, sealing chute by drying cylinder 4 opening for feed places enters in drying cylinder 4, drying cylinder 4 interior by raw coal moisture drying to≤6wt%, and under action of gravity, the rotation along with drying cylinder 4 slips out from the sealing chute in drying cylinder 4 exits, completes drying and dehydrating 2 times;
(4) dry carrier gas order, through drying cylinder 4 and silo 3, after raw coal antikinesis, enters after fly-ash separator 1, discharged to atmosphere.
Wherein, the quantity of carrier gas arm 8 is >=10.
Raw coal size is≤40mm.
Dry carrier gas is one or more in Steel Plant's waste gas such as the useless flue gas of hotblast stove, the useless flue gas of heater for rolling steel, the useless flue gas of sintering circular-cooler, the useless flue gas of sintering oven and the useless flue gas of pit kiln, and temperature range is 110 DEG C-180 DEG C.
Drying cylinder 4 is horizontal type structure, rotatable, and places horizontal by being not more than 20o angle.Drying cylinder 4 comprises cylindrical shell 12, gear 9, driving motor 10, step-down gear 11, dry carrier gas channel 5 and support roll 7.Dry carrier gas channel 5 passes at its axis, drying cylinder 4 rotates with certain rotating speed under the mechanical effect of gear 9, driving motor 10 and step-down gear 11, make the raw coal in drying cylinder 4 fully contact dehydration with dry carrier gas under drying cylinder 4 turning efforts, and under the effect of gravity, move to gradually drying cylinder 4 exit chute.
The invention has the advantages that:
1, dry heat flue gas of the present invention adopts iron and steel enterprise's waste gas completely, does not need newly-built heating combustion gas furnace, advocates recycling economy, reduces energy consumption.
2, the present invention carries out two step dehydrations to raw coal, and by Stirring, raw coal is fully contacted with hot flue gas, removes to greatest extent moisture, and energy utilization is abundant.
3, in existing coal pulverizer situation, give full play to equipment maximum capacity, reduce the equipment availability time, when save energy, reduce maintenance of the equipment.
4, a whole set of dehumidification system forms subnormal ambient under exhaust blower effect, and inside is inert atmosphere, needn't increase other sfgd.s, and dust does not leak, and is beneficial to environmental protection.
Brief description of the drawings
Fig. 1 is a kind of schema for pulverized coal injection raw coal preheating dewatering process of the present invention.Wherein, fly-ash separator 1, exhaust blower 2, silo 3, drying cylinder 4, dry carrier gas channel 5, star-like dumper 6.
Fig. 2 is the structural representation of drying cylinder in the present invention.Wherein, dry carrier gas channel 5, supporting roll 7, carrier gas arm 8, gear 9, driving motor 10, step-down gear 11, cylindrical shell 12.
Embodiment
Fig. 1-Fig. 2 is a kind of embodiment of the present invention.
Embodiment 1:
In the present embodiment, dry carrier gas is the useless flue gas that hotblast stove produces, 170 DEG C of temperature, and raw coal water content 20wt%, raw coal size scope 10mm～40mm, embodiment is as follows:
(1) newly-built dry with silo 3, silo 3 is connected by seal for pipe joints with gas inlet and the discharge of fly-ash separator 1, fly-ash separator 1 can be received be dried the coal dust of carrier gas from taking away in silo 3, and the coal dust of collecting is returned to silo 3; And on the pipeline being connected with the discharge of fly-ash separator 1 at silo 3, star-like dumper 6 is set, prevent the dry reverse inflow fly-ash separator 1 of carrier gas; The emission gases outlet of fly-ash separator 1 is connected with the inlet seal of exhaust blower 2, makes the interior formation negative pressure of silo 3; The former coal export of silo 3 is connected by sealing chute with the opening for feed of drying cylinder 4; And be dried carrier gas channel 5 interior setting of drying cylinder 4, on dry carrier gas channel 5,20 carrier gas arms 8 are set;
(2) raw coal transportation is to silo 3, former moisture content of coal is dried to 12wt% from 20wt% silo 3 is interior, completes drying and dehydrating 1 time;
(3) raw coal that completes 1 drying and dehydrating is under the effect of gravity, sealing chute by drying cylinder 4 opening for feed places enters in drying cylinder 4, by raw coal moisture drying to 6wt%, and under action of gravity, the rotation along with drying cylinder 4 slips out from the sealing chute in drying cylinder 4 exits, completes drying and dehydrating 2 times;
(4) dry carrier gas order, through drying cylinder 4 and silo 3, after raw coal antikinesis, enters after fly-ash separator 1, discharged to atmosphere.
Drying cylinder 4 is horizontal type structure, rotatable, and places horizontal by 15o angle.Drying cylinder 4 comprises cylindrical shell 12, gear 9, driving motor 10, step-down gear 11, dry carrier gas channel 5 and support roll 7.Dry carrier gas channel 5 passes at its axis, drying cylinder 4 rotates with certain rotating speed under the mechanical effect of gear 9, driving motor 10 and step-down gear 11, make the raw coal in drying cylinder 4 fully contact dehydration with dry carrier gas under drying cylinder 4 turning efforts, and under the effect of gravity, move to gradually drying cylinder 4 exit chute.
Claims (1)
1. for a pulverized coal injection raw coal preheating dewatering process, it is characterized in that, concrete technology step is:
1) will have coal storage silo and transform dryness storehouse (3) as, silo (3) is connected by seal for pipe joints with gas inlet and the discharge of fly-ash separator (1), make fly-ash separator (1) can receive the coal dust of dry carrier gas from taking away in silo (3), and the coal dust of collecting is returned to silo (3); And on the pipeline being connected with the discharge of fly-ash separator (1) at silo (3), star-like dumper (6) is set, prevent the dry reverse inflow fly-ash separator of carrier gas (1); The emission gases outlet of fly-ash separator (1) is connected with the inlet seal of exhaust blower (2), makes formation negative pressure in silo (3); The former coal export of silo (3) is connected by sealing chute with the opening for feed of drying cylinder (4); And in drying cylinder (4), be provided with the dry carrier gas channel (5) of carrier gas arm (8);
2) raw coal transportation, to silo (3), is dried to 12wt% by former moisture content of coal from 20wt%, completes drying and dehydrating 1 time;
3) raw coal that completes 1 drying and dehydrating is under the effect of gravity, enter in drying cylinder (4) by the sealing chute at drying cylinder (4) opening for feed place, in drying cylinder (4) by raw coal moisture drying to 6wt%, and under action of gravity, the rotation along with drying cylinder (4) slips out from the sealing chute in drying cylinder (4) exit, completes drying and dehydrating 2 times;
4) dry carrier gas order, through drying cylinder (4) and silo (3), after raw coal antikinesis, enters after fly-ash separator (1), discharged to atmosphere;
Described drying cylinder (4) is horizontal type structure, rotatable, and place horizontal by 15 ° of angles, drying cylinder (4) comprises cylindrical shell (12), gear (9), driving motor (10), step-down gear (11), dry carrier gas channel (5) and support roll (7), dry carrier gas channel (5) passes at its axis, drying cylinder (4) is in gear (9), under the mechanical effect of driving motor (10) and step-down gear (11), rotate with certain rotating speed, make the raw coal in drying cylinder (4) fully contact dehydration with dry carrier gas under drying cylinder (4) turning effort, and under the effect of gravity, move to gradually drying cylinder (4) exit chute,
The quantity of the carrier gas arm (8) described in step 1) is 10;
Step 2), 3) and 4) described in the granularity of raw coal be 10mm-40mm;
Step 4) and 1) described in dry carrier gas be the useless flue gas of hotblast stove, temperature range is 170 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310127972.2A CN103173259B (en) | 2013-04-13 | 2013-04-13 | Raw coal preheating and dehydrating technology for blast furnace coal injection |
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| CN201310127972.2A CN103173259B (en) | 2013-04-13 | 2013-04-13 | Raw coal preheating and dehydrating technology for blast furnace coal injection |
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| CN103173259A CN103173259A (en) | 2013-06-26 |
| CN103173259B true CN103173259B (en) | 2014-07-30 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410705A (en) * | 2011-11-22 | 2012-04-11 | 北京神雾环境能源科技集团股份有限公司 | Multistage continuous overheated steam drying system and method of low-rank coal |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410705A (en) * | 2011-11-22 | 2012-04-11 | 北京神雾环境能源科技集团股份有限公司 | Multistage continuous overheated steam drying system and method of low-rank coal |
Non-Patent Citations (1)
| Title |
|---|
| 潘永康.干燥.《现代干燥技术》.化学工业出版社,1998,第106-107页. * |
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