CN102796545B - Method and device for humidifying coke by using oven coking airflow and packed bed - Google Patents
Method and device for humidifying coke by using oven coking airflow and packed bed Download PDFInfo
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- CN102796545B CN102796545B CN201110144319.8A CN201110144319A CN102796545B CN 102796545 B CN102796545 B CN 102796545B CN 201110144319 A CN201110144319 A CN 201110144319A CN 102796545 B CN102796545 B CN 102796545B
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Abstract
The invention relates to a method and a device for humidifying coke by using oven coking airflow and packed bed. According to the method, the coking gas from the coke oven is used as a heat source, the coking coal to enter the coke oven is humidified by an airflow drier, and on the premise of stabilizing the water content of the coal to enter the coke oven, the productive capacity of the coke oven is increased and the quality of coke is improved; and the difficulty in operating the coke oven and the recovering system, caused by low water content, is avoided. By adopting the method and the device, the production rate of the coke oven is increased by 10 to 12 percent, the yield of coke oven gas is increased by 7 to 9 percent, and the energy is reduced by 13 to 15 percent.
Description
Technical field
The present invention relates to coking coal in coke oven damping, technical field of drying, belong to a kind of coke-oven coal damping, dry method.The method is also applicable to the dry of other inflammable, explosive material.
Background technology
The existing coke oven throughput of China is larger, account for No. 1 in the world, coking coal moisture is higher, and high-quality caking coal worsening shortages, around existing coke oven and coking production technique, exploitation improves coke quality and utilizes novel process, the new technology of coking waste heat is to adapt to enterprise development, improves the effective way of Business Economic Benefit.
Coal dry with the ultimate principle of coal damping be to utilize additional heat energy that coking coal materials is dried at pit kiln, dewaters to reduce into the moisture of stove coal or regulates entering the moisture of stove coal outward, controlling coking energy input, improve coking technique, improve coke quality or expand the coking technology of caking coal consumption.In coal coking process, moisture does not participate in coking.Coal is after super-dry or damping, and coal charge moisture reduces and be stable.Due to coke oven in the unit time under normal operation heat supplied be stable, the coking heat of a certain amount of coal is certain, so coal charge moisture is stable, to be conducive to coking technique stable, avoids coke not yet done or overdo.Coal charge moisture reduces, and the coal charge at coking chamber center and Center Temperature of Coke Cake was shortened in the residence time of 100 ℃ of left and right, thereby can shorten coking time, raising rate of heating, minimizing coking heat consumption.Coal charge moisture is reduced to 6% when following, and it is imperfect that the moisture film of coal particle surface becomes, and surface tension reduces.Moisture is lower, and moisture film is more few more imperfect, and surface tension is also just lower.Meanwhile, because coal particle surface moisture film hinders the relative displacement between coal particle, so shove charge improves mobility after the dry or damping of coal, the gap between coal particle is easily filled up mutually, so shove charge coal density increases.Shove charge coal density increases and coking speed accelerates to make coke oven throughput to improve, and improves coke quality or multiplex high volatile component weak bonding property coal coking.
Coking coal in coke oven moisture control method can reduce and stablize the moisture of controlling into stove coal, the difference dry with coal is not pursue the moisture of removing to greatest extent into stove coal, and only moisture stabilization in relatively low level, both can reach the object that increases benefit, because moisture is too low, do not cause again the difficulty of coke oven and recovery system operation, make to stablize texts into the increase of stove coal density, coke and Chemicals volume increase, coal gas amount minimizing for coke oven heating, coke quality raising and coking technique.
Summary of the invention
In view of above-mentioned, the present invention proposes a kind of coking by coke oven air-flow-packed bed of a kind of coking by coke oven coal moisture control method,
Another object of the present invention is to provide the device of a set of enforcement coking by coke oven air-flow-packed bed coal moisture control method, the nucleus equipment of this device---pneumatic dryer and coke oven tail gas by coking coal moisture stabilization in relatively low level, both can reach the object that increases benefit, because moisture content of coal is too low, not cause again the difficulty of coke oven and recovery system operation.
Object of the present invention can be achieved through the following technical solutions:
A kind of coking by coke oven air-flow-packed bed coal moisture control method, it is characterized in that: after quantitative analysis, the coal dust of moisture content enters in pneumatic dryer through charging rotary valve, coke oven tail gas divides two-way to send in pneumatic dryer by coke oven tail gas blower fan, enter the coal dust and the coke oven tail gas contact drying that enters pneumatic dryer of pneumatic dryer, wherein macrobead can not be brought into after being dried in the fluidized-bed structure that airflow drying tube is deposited on pneumatic dryer bottom and be entered in mixing silo by macrobead rotary valve by coke oven tail gas, small-particle can be brought into airflow drying tube by coke oven tail gas, after airflow drying tube is dry, enter the settling pocket sedimentation of pneumatic dryer top, the coal dust drying device discharging rotary valve settling down enters in mixing silo and macrobead blending, coal after blending is delivered to next workshop section through handling equipment, flue gas, water vapor and the coal dust dust of from pneumatic dryer top of settling chamber classifier, discharging are carried out gas solid separation by tail gas induced draft blower withdraws in sack cleaner, flue gas after separation is delivered to smoke stack emission by tail gas induced draft fan, the dust deposit separating enters mixing tank to sack cleaner bottom through cloth bag discharging rotary valve, at this coal dust, mix with additive, mixed coal dust is delivered to next workshop section by handling equipment after entering forming machine moulding after being got rid of by mixing tank bottom.This system is provided with standby burner between coke oven tail gas blower fan and pneumatic dryer.
A device for a kind of coking by coke oven air-flow-packed bed of a kind of coking by coke oven coal moisture control method described in 1, is characterized in that this device comprises:
1-charging rotary valve is used for, by the coal dust input pneumatic dryer of moisture content, contacting with coal dust;
2-pneumatic dryer moisture eliminator bottom is a packed bed structure, and middle part is airflow drying tube, and top is for expanding settling pocket, and settling pocket inner top is classifier.The coal that enters pneumatic dryer fully contacts coal is dried with the coke oven tail gas that enters pneumatic dryer in moisture eliminator;
Coke oven tail gas after 3-coke oven tail gas fan action Shi Jiang coke-oven plant's coking is divided into two tunnels and enters pneumatic dryer and contact with coal dust;
4-rotary valve is positioned between pneumatic dryer and mixing silo, and be used for being brought into airflow drying tube by coke oven tail gas and be deposited on pneumatic dryer bottom macrobead coal dust and enter in mixing silo,
The effect of 5-mixing silo is that the coal after blending is delivered to next workshop section through handling equipment by the small-particle coal dust blending of the macrobead coal dust of overwinding rotary valve and overwinding rotary valve;
6-moisture eliminator discharging rotary valve is positioned between pneumatic dryer and mixing silo, is used for entering after airflow drying tube is dry small-particle coal dust that moisture eliminator top settling pocket settles down and enters in mixing silo and macrobead blending;
Flue gas, water vapor and coal dust dust suction that 7-tail gas induced draft fan is used for pneumatic dryer top of settling chamber classifier to discharge are carried out gas solid separation in sack cleaner,
8-sack cleaner is used for carrying out gas solid separation by tail gas induced draft blower withdraws small-particle coal dust with in company with the flue gas entering;
9-cloth bag discharging rotary valve is positioned between sack cleaner and mixing tank, sends depositing to the dust dividing at the bottom of sack cleaner into mixing tank;
10-mixing tank is that discharging coal dust is mixed with coal tar or other additive;
11-forming machine will be delivered to next workshop section after the materiel machining moulding of mixing;
12-burner is positioned between pneumatic dryer and coke oven tail gas blower fan, when coke oven tail gas is inadequate, produces hot blast and is used for being dried coal dust.
Adopt the beneficial effect of advantage of the present invention and generation to be:
1, the present invention can reduce and stablize the moisture of controlling into stove coal, the difference dry with coal is not pursue the moisture of removing to greatest extent into stove coal, and only the coking coal moisture stabilization that enters coke oven in relatively low level, both can reach the object that increases benefit, because moisture is too low, do not cause again the difficulty of coke oven and recovery system operation, make to reduce by coal gas amount into the increase of stove coal density, coke and Chemicals volume increase, coke oven heating.By statistics, coke oven productivity improves 10%～12%; Coke-oven gas output improves 7%～9%; Coke oven energy-conservation 13%～15%.
2, the present invention, in the situation that keeping coke quality constant, can increase cheap half baking coal or non-coking coal in coal charge, can reduce raw materials cost.
3, drying source employing coke oven tail gas is the coke oven tail gas after coke-oven plant's coking, and coke oven tail gas is fully used, and meets national energy-saving and reduces discharging policy.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, invention technical scheme is further described again:
Air-flow-packed bed coal moisture control method, can carry out in the steps below:
The coke oven tail gas that the coal dust drying device charging rotary valve 1 of moisture content in 10.5% left and right enters after pneumatic dryer 2 Nei，You coke-oven plant coking after quantitative analysis is sent in pneumatic dryer 2 by 3 minutes two-way of coke oven tail gas blower fan.Pneumatic dryer 2 is divided into four parts, and the bottom of pneumatic dryer 2 is a packed bed structure, and middle part is airflow drying tube, and top is for expanding settling pocket, and settling pocket inner top is classifier.The coal that enters pneumatic dryer 2 in moisture eliminator with the abundant contact drying of coke oven tail gas that enters pneumatic dryer 2, the particle of wherein >=3mm is entered in mixing silo 5 by macrobead rotary valve 4 after can not being brought into and be dried in the fluidized-bed structure that airflow drying tube is deposited on pneumatic dryer 2 bottoms by coke oven tail gas; ≤ 3mm particle can be brought into airflow drying tube by coke oven tail gas, after airflow drying tube is dry, enter the settling pocket sedimentation of moisture eliminator top, the coal dust drying device discharging rotary valve 6 settling down enters in mixing silo 5 and macrobead blending, and the coal after blending is delivered to next workshop section through handling equipment.
Flue gas, water vapor and the coal dust dust of discharging from pneumatic dryer top of settling chamber classifier 7 is drawn into and in sack cleaner 9, carries out gas solid separation by tail gas induced draft fan 8, flue gas after separation is delivered to smoke stack emission by tail gas induced draft fan 8, the dust deposit separating enters mixing tank 11 to sack cleaner 9 bottoms through cloth bag discharging rotary valve 10, this coal dust and additive---coal tar mixes, mixed coal dust enters forming machine 12 after being got rid of by mixing tank 11 bottoms, after moulding, by handling equipment, is delivered to next workshop section.
Between coke oven tail gas blower fan 3 and pneumatic dryer 2, be provided with standby burner 13.When coke oven tail gas is inadequate, can use standby burner to produce hot blast and be used for being dried coal dust.
At pneumatic dryer 2 outlet exhaust pipes, mix a certain amount of coke oven tail gas, can prevent the dry rear tail gas dewfall of coal dust.
Claims (2)
1. coking by coke oven air-flow-packed bed coal moisture control method, it is characterized in that: after quantitative analysis, the coal dust of moisture content is in charging rotary valve (1) enters pneumatic dryer (2), coke oven tail gas is sent in pneumatic dryer (2) by coke oven tail gas blower fan (3) minute two-way, enter the coal dust and the coke oven tail gas contact drying that enters pneumatic dryer (2) of pneumatic dryer (2), wherein macrobead can not be brought into after being dried in the fluidized-bed structure that airflow drying tube is deposited on pneumatic dryer (2) bottom and be entered in mixing silo (5) by macrobead rotary valve (4) by coke oven tail gas, small-particle can be brought into airflow drying tube by coke oven tail gas, after airflow drying tube is dry, enter pneumatic dryer (2) top settling pocket sedimentation, the coal dust drying device discharging rotary valve (6) settling down enters in mixing silo (5) and macrobead blending, coal after blending is delivered to next workshop section through handling equipment, the flue gas of discharging from pneumatic dryer (2) top of settling chamber classifier (7), water vapor and coal dust dust are drawn in sack cleaner (9) and carry out gas solid separation by tail gas induced draft fan (8), flue gas after separation is delivered to smoke stack emission by tail gas induced draft fan (8), the dust deposit separating enters mixing tank (11) to sack cleaner (9) bottom through cloth bag discharging rotary valve (10), at this coal dust, mix with additive, mixed coal dust is delivered to next workshop section by handling equipment after entering forming machine (12) moulding after being got rid of by mixing tank (11) bottom, this system is provided with standby burner (13) between coke oven tail gas blower fan (3) and pneumatic dryer (2).
2. a device that implements the claims a kind of coking by coke oven air-flow-packed bed coal moisture control method described in 1, is characterized in that this device comprises:
Charging rotary valve (1) is used for, by the coal dust input pneumatic dryer (2) of moisture content, contacting with coal dust;
Pneumatic dryer (2) moisture eliminator bottom is a packed bed structure, and middle part is airflow drying tube, and top is sudden enlargement settling pocket, and settling pocket inner top is classifier; The coal that enters pneumatic dryer (2) fully contacts coal is dried with the coke oven tail gas that enters pneumatic dryer (2);
Coke oven tail gas blower fan (3) is used for that the coke oven tail gas after coke-oven plant's coking is divided into two tunnels and enters pneumatic dryer (2) and contact with coal dust;
Macrobead rotary valve (4) is positioned between pneumatic dryer (2) and mixing silo (5), is used for being brought into airflow drying tube by coke oven tail gas and is deposited on pneumatic dryer (2) bottom macrobead coal dust and enters in mixing silo (5);
Mixing silo (5) effect is that the coal after blending is delivered to next workshop section through handling equipment by the small-particle coal dust blending of the macrobead coal dust of oversized particles rotary valve (4) and moisture eliminator discharging rotary valve (6);
Moisture eliminator discharging rotary valve (6) is positioned between pneumatic dryer (2) and mixing silo (5), is used for entering after airflow drying tube is dry small-particle coal dust that moisture eliminator top settling pocket settles down and enters in mixing silo (5) and macrobead blending;
Classifier (7) is positioned between pneumatic dryer (2) and sack cleaner (9), for controlling the particle diameter that enters sack cleaner coal dust dust;
Flue gas, water vapor and coal dust dust suction that tail gas induced draft fan (8) is used for pneumatic dryer top of settling chamber classifier to discharge are carried out gas solid separation in sack cleaner (9);
Sack cleaner (9) is used for tail gas induced draft fan (8) suction small-particle coal dust and carries out gas solid separation in company with the flue gas entering;
Cloth bag discharging rotary valve (10) is positioned between sack cleaner (9) and mixing tank (11), and the dust that deposits to sack cleaner (9) bottom is sent into mixing tank (11);
Mixing tank (11) is that discharging coal dust is mixed with coal tar;
Forming machine (12) will be delivered to next workshop section after the materiel machining moulding of mixing;
Burner (13) is positioned between pneumatic dryer (2) and coke oven tail gas blower fan (3), when coke oven tail gas is inadequate, produces hot blast and is used for being dried coal dust.
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| CN201110144319.8A CN102796545B (en) | 2011-05-28 | 2011-05-28 | Method and device for humidifying coke by using oven coking airflow and packed bed |
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| US9663738B2 (en) | 2012-12-26 | 2017-05-30 | Sk Innovation Co., Ltd. | Pneumatic conveying dryer for carbon fuel |
| CN103695016A (en) * | 2013-12-23 | 2014-04-02 | 黄石市建材节能设备总厂 | Process method for humidifying coal dust and forming and returning dust by using waste heat of top-charging coke oven |
| CN104567280B (en) * | 2014-12-29 | 2017-01-18 | 中国华电集团科学技术研究总院有限公司 | Entrained-flow bed and fluidized bed coupled lignite drying device and entrained-flow bed and fluidized bed coupled lignite drying method |
| CN104534848B (en) * | 2014-12-29 | 2017-05-10 | 中国华电集团科学技术研究总院有限公司 | Brown coal drying power generation system and implementation method thereof |
| CN113862016B (en) * | 2021-09-29 | 2023-12-05 | 大连科力一诺环保科技有限公司 | Coking coal gradient preheating process and equipment |
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| CN102021006A (en) * | 2009-09-22 | 2011-04-20 | 山东省冶金设计院有限责任公司 | Process for removing water content from coking coal |
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| JPS5767687A (en) * | 1980-10-14 | 1982-04-24 | Sumikin Coke Co Ltd | Production of coke by adding coal formed in plural shapes |
| JP2003183670A (en) * | 2001-12-19 | 2003-07-03 | Nippon Steel Corp | Method for pre-treating coal |
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| CN102021006A (en) * | 2009-09-22 | 2011-04-20 | 山东省冶金设计院有限责任公司 | Process for removing water content from coking coal |
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| JP特开昭57-67687A 1982.04.24 |
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Address after: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant after: Tianhua Institute of Chemical Machinery & Automation Co., Ltd. Applicant after: National Drying Technology and Equipment Engineering Technology Research Center Address before: 730050 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant before: Tianhua Chemical Machinery & Automation Research Inst. Applicant before: National Drying Technology and Equipment Engineering Technology Research Center |
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