CN103952167B - A kind of energy saving and environment friendly low moisture coke making process and system - Google Patents

A kind of energy saving and environment friendly low moisture coke making process and system Download PDF

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CN103952167B
CN103952167B CN201410202430.1A CN201410202430A CN103952167B CN 103952167 B CN103952167 B CN 103952167B CN 201410202430 A CN201410202430 A CN 201410202430A CN 103952167 B CN103952167 B CN 103952167B
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coal
coking
coke
low moisture
foerderanlage
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CN103952167A (en
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余广炜
汪印
王兴栋
邢贞娇
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Institute of Urban Environment of CAS
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Abstract

The invention discloses a kind of energy saving and environment friendly low moisture coke making process and system, be 3% ~ 6% by dry for coke-oven plant's coke making and coal blending damping to water ratio, then sieve, by grade & lt; The coal dust of 1mm mixes with newly-increased weak caking coal of joining and direct pressing is shaping, the low moisture binder free typed briquette of preparation and grade & gt; The damping coal dust of 1mm is mixed into coke oven arrangement coking.Present device system mainly comprises dry humidity control device, screening plant, metering device, mixing device, shaped device, coke oven arrangement etc.The invention has the advantages that: can realize improving coke oven production capacity simultaneously, reduce discharge of wastewater, improve coke quality, increase weak caking coal proportioning, reduce the multiple targets such as coking cost, there is good energy-saving benefit, environmental benefit and economic benefit.

Description

A kind of energy saving and environment friendly low moisture coke making process and system
Technical field
The present invention discloses a kind of energy saving and environment friendly low moisture coke making process and system, divides and belongs to coking coal pre-treatment and New Cokemaking Processes field, especially relate to the coke making process improving weak caking coal allocation ratio by International Patent Classification (IPC) (IPC).
Background technology
Along with world economy and scientific and technological fast development, facing mankind the dual-pressure of resources and environment.With regard to iron and steel production, worldwide coke anxiety and coking coal shortage of resources have badly influenced the development of Iron and Steel Production and world economy.Use coal coking, with coke ironmaking, remain the prevailing technology that world steel is produced up to now.China is coke production big country, and traditional coking technology of employing is too strong to coking coal dependency, causes coking cost to remain high; And traditional coking technology adopts wet coal coking, and as-fired coal water ratio mostly is 9% ~ 12%, coking energy consumption is large, coking time long, coking chemical waste water output is large, and environmental pollution is serious.Day by day perfect along with Iron and Steel Production technology, how under the condition of coking coal resource shortage, obtains satisfactory high-strength metallurgical coke, and process of coking is reduced costs, decreasing pollution, to raise the efficiency, and has become following development trend.In this context, conventional coke making process obviously can not meet Times ' Demand, needs development of new coke making process technology to realize above-mentioned functions.
From world wide, advanced coking technology mainly comprises coal conditioning technique, briquetted coal blending coking technology, Japanese SCOPE-21 New Coke-making Technology, coke oven maximization technology, coking automatic technology, Continuous coking technology, coke passivation technology, coke coating technique etc.These technology are divided into three types after all: (1) coking coal preconditioning technique; (2) process of coking optimisation technique; (3) coke post-processing technology.Process of coking optimisation technique is subject to the serious restriction of existing coke oven for iron system and Controlling System, and industrial application is less.Coke post-processing technology is conceived to the modification of coke finished product, and for raising coke quality, to reduce the effect of coking cost very limited, is mostly in the experimental study stage.Coking coal preconditioning technique carries out pre-treatment fed to boiler coking in advance by rational coal blending, pulverizing, damping, preheating, the process means such as shaping to coke making and coal blending, reach the object improving coke oven output, energy efficient, raising coke quality and expand coking coal resource, have a good application prospect.
At present, the research of coal dust conditioning technique mainly concentrates on the development field of the selection of damping thermal source and damping equipment.As CN103484139A discloses a kind of technique for coking coal humidifying, adopt high-efficiency energy-saving drum-type dryer, the coke oven flue gas extracted in coke oven main flue carrys out dry coking as main heating source and to wet coal, to coaling coking and tamping coking after adjustment moisture for top; CN103305248A then discloses a kind of method and system utilizing vacuum mode to carry out coal dust damping.Although coal damping makes the moisture in as-fired coal reduce, obvious to minimizing coking chemical waste water discharge effect, but the bulk density that it brings increases the flowing only deriving from capillary reduction and coal grain, the not extruding of external force, thus the advantage in increase weak caking coal proportioning is also not obvious, usually only can reach about 5%; And, conventional coal humidifying technology requires that coal dust water ratio in principle can not lower than 6%, with the negative impact avoiding coal dust overdrying to bring existing coke furnace system, as coal port is smoldered, burned with anger, upcast and coking chamber wall calculus ink increase, coke tar refuse increases, and tar processing difficulty strengthens, gas cleaning system blocking etc.Therefore, conventional coal damping coke making process is still significantly improved space.
For problem such as raising coking coal bulk density and coking of shaping coal etc., lot of domestic and international investigator has also carried out correlative study.As CN103370395A, CN101541922A disclose a kind of coal debulking methods for coke making process and device, coal particle is carried out compaction treatment by the cylindrical compactor of oscillatory type on the charging plate of pit kiln outside, then enters coking by coke oven; CN101381645A by waste rubber, plastic waste heating for dissolving in scallion oil, then adds coke tar refuse and asphaltum oil heated and stirred in proportion, and obtained briquette binder is for the production of moulded coal; KR8100312 proposes the process program utilizing pitch for binding agent production moulded coal; CN200510092966.3, CN200510027429.0 and CN1632077A propose the method and system utilizing coke-oven plant's organic solid castoff production coking moulded coal, and target is comprehensive utilization coking organic solid waste; CN200510027429.0 discloses a kind of composite adhesive for briquette, and the super separator coke tar refuse by 7 ~ 17%, the ammoniacal liquor clarifying tank coke tar refuse of 18 ~ 33% and the viscid bitumen of 50 ~ 75% form.Although above-mentioned patented technology to raising as-fired coal bulk density, improve coke quality, increase coke oven production capacity there is obvious effect, what relate generally to is exploitation and the preparation of briquette binder, and it is shaping not relate to damping.The shortcomings such as the large and running cost of domestic version coal coking technology ubiquity investment is higher, only obtain applications well in Baosteel company.
In addition, the SCOPE-21 New Coke-making Technology of exploitation is presided over by nippon company, first by feed coal dry classification, then coarse particles coal and fine particulate coal is heated rapidly to 350 DEG C ~ 400 DEG C respectively, finally hot-forming to fine powdered coal, be mixed together with coarse particles coal dust and send into stove coking.In fact the coking coal dust process of this technology experienced by " stove coking is carried-entered to dry classification-rapidly pre-warming-hot-forming-high temperature " process, advanced technology, but technique and equipment are all very complicated, and operation easier is large, investment and working cost high, results of industrial application is undesirable.
Summary of the invention
In order to overcome defect and the deficiency of existing coking technology, the invention provides a kind of energy saving and environment friendly low moisture coke making process, its ultimate principle is based on coal damping coking theory with briquetted coal blending coking theory, maximize favourable factors and minimize unfavourable ones, on the one hand, pass through damping, make the level that coking coal water tariff collection is lower, improve as-fired coal bulk density, reduce coking energy consumption, reduce coking chemical waste water discharge; On the other hand, the weak caking coal of joining will be increased, be diffused into particle surface with internal moisture and still have the fine granularity coal dust of certain temperature to mix, under water and the acting in conjunction of coal dust self particle, direct voltage is shaping, well solve the coking of low moisture fine powdered coal to the negative impact of existing coke furnace system, also achieve polygamy weak caking coal, reduce the target of coking cost.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of energy saving and environment friendly low moisture coke making process, performing step comprises:
(1) first coking mixed coal in coke-oven plant's is carried out dry damping, regulate moisture to 3% ~ 6%;
(2) coal dust after damping is sieved, be divided into the coal dust of grade <1mm and the coal dust of grade >1mm;
(3) after being mixed with newly-increased weak caking coal of joining by the coal dust of grade <1mm, direct pressing is shaping, and prepare low moisture binder free typed briquette, increasing the ratio of joining weak caking coal is 0 ~ 20% of total Mixture Density Networks weight;
(4) by the coal dust blending transportation of low moisture binder free typed briquette and grade >1mm to the main coal blending belt of coke oven, finally enter coke oven arrangement coking.
Another object of the present invention is to provide a kind of system implementing energy saving and environment friendly low moisture coke making process, mainly comprise dry humidity control device, screening plant, metering device, mixing device, shaped device, coke oven arrangement, equipment connection mode is: 1# e Foerderanlage (1) outlet is connected with dry humidity control device (2) entrance, dry humidity control device (2) outlet is connected with screening plant (3) entrance, the outlet of screening plant (3) screen overflow is connected with 4# e Foerderanlage (4) entrance, the outlet of screening plant (3) screen underflow is connected with 2# e Foerderanlage (5) entrance, 2# e Foerderanlage (5) outlet is connected with mixing device (9) entrance, 3# e Foerderanlage (6) outlet is connected with buffer bin (7) entrance, buffer bin (7) outlet is connected with metering device (8) entrance, metering device (8) outlet is connected with mixing device (9) entrance, mixing device (9) outlet is connected with shaped device (10), shaped device (10) outlet is connected with 4# e Foerderanlage (4) entrance, 4# e Foerderanlage (4) outlet is connected with coking factory owner coal blending belt (11) entrance, and coking factory owner coal blending belt (11) outlet is connected with coke oven arrangement (12),
Its processing unit system description is: coke-oven plant's coke making and coal blending is transported to dry humidity control device (2) by 1# e Foerderanlage (1) and carries out conditioning, coal dust after damping sieves through screening plant (3), the coal dust of grade >1mm is conveyed into coking factory owner coal blending belt (11) through 4# e Foerderanlage (4), and the coal dust of grade <1mm delivers into mixing device (9) through 2# e Foerderanlage (5); Newly-increased weak caking coal of joining is conveyed into buffer bin (7) through 3# e Foerderanlage (6), and by metering device (8) dosing of buffer bin bottom to mixing device (9), mix with the coal dust of grade <1mm; Mixed material enters shaped device (10) high-pressure molding, and the low moisture binder free typed briquette prepared drops in the coal dust of the grade >1mm carried by 4# e Foerderanlage (4); Finally, all materials are conveyed into coking factory owner coal blending belt (11) by 4# e Foerderanlage, enter coke oven arrangement (12) coking.
The present invention can realize simultaneously multiple targets such as " improve coke oven production capacity, reduce discharge of wastewater, improve coke quality, expand coking coal resource, reduce coking cost ".The present invention increases and joins weak caking coal and the reason that do not affect coke quality is: utilize fine powdered coal and weak caking coal to prepare low moisture binder free typed briquette, coal intergranular gap reduces, interface cohesion strengthens, bulk density significantly improves, and adhesion component and the inert component effect of coal dust charing plastic stage are abundant; And weak caking coal powder, with fine powdered coal mixed high-voltage moulding process, achieves selective molecular attraction indirectly, improve coking performance to a certain extent, improve pyrolysis of coal plastic mass degree of mobilization and cohesiveness, reduce coke crackle, thus obtain good coke quality.
The beneficial effect that the present invention adopts technique scheme to produce is:
(1), compared with need controlling coal dust " water ratio is not less than 6% " with conventional coal humidifying technology, entering stove mixed coal water ratio can be reduced to 3%.In view of coal dust often reduces the water ratio of 1%, coking saving energy 20MJ/t coal can be made, estimate with the medium-sized coke-oven plant that scale is 1,000,000 tons/year, will than conventional coal humidifying technology save energy about 6 × 10 7mJ/, energy-saving benefit is remarkable;
(2) new technology reduce further coking charge coal water ratio, coking chemical waste water is discharged and significantly reduces, further mitigate Treatment of Coking Effluent pressure; And, due to the low moisture coal dust compression moulding by grade <1mm, solve low the caused coal port of as-fired coal water ratio to smolder, burn with anger, upcast and coking chamber wall calculus ink increase, coke tar refuse increases, tar processing difficulty strengthens, the series of problems such as gas cleaning system blocking; In addition, because as-fired coal water ratio reduces, coke oven fire path medial temperature can reduce by 10 DEG C ~ 20 DEG C, and this makes NO in outer smoke-uptake gas xcontent decreases, and is conducive to air environmental protection.Therefore, integrated environment remarkable benefit;
(3) new technology adopts binder free typed briquette preparation technology, on the one hand, rationally solves that the binding agent demand that conventional briquetted coal blending coking technology relates to is large, high in cost of production problem, adds shove charge dump density, improve coke oven production capacity; On the other hand, on the basis of the conventional coal blending in coke-oven plant, increase and allocate weak caking coal about 20% into, reduce coking raw materials cost, expanded coking coal resource; If do not increase and join weak caking coal, then coke quality will significantly improve.Therefore, remarkable in economical benefits;
(4) new technology does not change original traditional coke making process system, and flow process is simple, and less investment, instant effect, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the processing unit system flowchart that the present invention relates to.
Wherein: 1.1# e Foerderanlage, 2. dry humidity control device, 3. screening plant, 4.4# e Foerderanlage, 5.2# e Foerderanlage, 6.3# e Foerderanlage, 7. buffer bin, 8. metering device, 9. mixing device, 10. shaped device, 11. main coal blending belts, 12. coke oven arrangement.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Embodiment: refer to Fig. 1, a kind of energy saving and environment friendly low moisture coke making process of the present invention, performing step comprises: first coking mixed coal in coke-oven plant's is carried out dry damping by (1), regulates moisture to 3% ~ 6%; (2) coal dust after damping is sieved, be divided into the coal dust of grade <1mm and the coal dust of grade >1mm; (3) after being mixed with newly-increased weak caking coal of joining by the coal dust of grade <1mm, direct pressing is shaping, prepares low moisture binder free typed briquette; (4) by the coal dust blending transportation of low moisture binder free typed briquette and grade >1mm to the main coal blending belt of coke oven, finally enter coke oven arrangement coking.Described mixed coal is conventional coking mixed coal, and primarily of bottle coal, rich coal, coking coal, 1/3 coking coal and lean coal composition, mixed coal water ratio is 9 ~ 15%.Described newly-increased weak caking coal of joining mainly refers to coking behavior is poor, price is low bottle coal and lean coal, especially Datong coal and Xishan coal; Increasing proportioning example is 0 ~ 20% of Mixture Density Networks gross weight.The dry damping of described coal dust can adopt direct heating or indirect heating manner, and thermal source can comprise steam, heat smoke, electricity and heat conduction wet goods; Consider from the economy of practical application, preferential employing low-pressure residual heat steam or coke oven flue waste gas.The dry damping water ratio of described coal dust may be controlled to 3% ~ 6%.The damping coal dust of described grade <1mm mixes with newly-increased weak caking coal of joining, shaping without the need to any binding agent direct pressing, forming pressure >150kg/cm 2; Described type coal shape can be circular, ellipse or square, and preferential recommendation ellipse, longest dimension is no more than 35mm.Described low moisture binder free typed briquette directly to drop in the coal dust of grade >1mm and blending transportation, is beneficial to reduce moulded coal breakage rate.Described low moisture binder free typed briquette accounts for and enters the total weight of material of coke oven than controlling as <60%.
Implement a system for energy saving and environment friendly low moisture coke making process, mainly comprise dry humidity control device 2, screening plant 3, metering device 8, mixing device 9, shaped device 10, coke oven arrangement 12 etc.Equipment connection mode is: 1# e Foerderanlage 1 exports and is connected with dry humidity control device 2 entrance, and dry humidity control device 2 exports and is connected with screening plant 3 entrance; The outlet of screening plant 3 screen overflow is connected with 4# e Foerderanlage 4 entrance, and the outlet of screening plant 3 screen underflow is connected with 2# e Foerderanlage 5 entrance, and 2# e Foerderanlage 5 exports and is connected with mixing device 9 entrance; 3# e Foerderanlage 6 exports and is connected with buffer bin 7 entrance, buffer bin 7 exports and is connected with metering device 8 entrance, metering device 8 exports and is connected with mixing device 9 entrance, mixing device 9 exports and is connected with shaped device 10, shaped device 10 exports and is connected with 4# e Foerderanlage 4 entrance, 4# e Foerderanlage 4 exports and is connected with coking factory owner coal blending belt 11 entrance, and coking factory owner coal blending belt 11 exports and is connected with coke oven arrangement 12.Described dry humidity control device 2 is fixed bed drying device, fluidized bed dryer, vacuum drier or revolving drum moisture eliminator.Described 1# e Foerderanlage 1,2# e Foerderanlage 5,3# e Foerderanlage 6 refer to rotary conveyor, scraper conveyor, bucket elevator, machine for zipper or worm conveyor, and 4# e Foerderanlage 4 is rotary conveyor.Described screening plant 3 is vibratory screening apparatus or trommel screen.Described mixing device 9 is single shaft mixing machine, double-shaft mixer, drum mixer, stirring mixer etc.Described shaped device 10 is common roller briquetting machine.Described coke oven arrangement 12 is existing traditional coke oven arrangement, without the need to carrying out any transformation.The metering device that native system adopts is screw feeder, star feeder or oscillating feeder.Finally it should be noted that: present invention process system adopts each equipment configuration all can directly be bought by market and install and use.
A kind of energy saving and environment friendly low moisture coke making process of the present invention and system, belong to coking coal pre-treatment and New Cokemaking Processes field.Dry for coke-oven plant's coke making and coal blending damping to water ratio is 3% ~ 6% by method of the present invention, then sieve, the coal dust of grade <1mm and newly-increased weak caking coal of joining mixs also direct pressing is shaping, the low moisture binder free typed briquette of preparation and the damping coal dust of grade >1mm are mixed into coke oven arrangement coking.The device systems that the method relates to mainly comprises dry humidity control device, screening plant, metering device, mixing device, shaped device, coke oven arrangement etc.The invention has the advantages that: multiple targets such as " improve coke oven production capacity, reduce discharge of wastewater, improve coke quality, increase weak caking coal proportioning, reduce coking cost " can be realized simultaneously, there is good energy-saving benefit, environmental benefit and economic benefit.New technology does not change original traditional coke making process system, and flow process is simple, and less investment, instant effect, has good application prospect.
Above, be only the embodiment utilizing this origination techniques content, the modification that any those skilled in the art use this creation to do, change, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.

Claims (10)

1. an energy saving and environment friendly low moisture coke making process, is characterized in that performing step comprises:
(1) first coking mixed coal in coke-oven plant's is carried out dry damping, regulate moisture to 3% ~ 6%;
(2) coal dust after damping is sieved, be divided into the coal dust of grade <1mm and the coal dust of grade >1mm;
(3) after being mixed with newly-increased weak caking coal of joining by the coal dust of grade <1mm, direct pressing is shaping, prepares low moisture binder free typed briquette, increases the weak caking coal of joining and accounts for total Mixture Density Networks weight ratio≤20%;
(4) by the coal dust blending transportation of low moisture binder free typed briquette and grade >1mm to the main coal blending belt of coke oven, finally enter coke furnace system coking.
2. the energy saving and environment friendly low moisture coke making process of one according to claim 1, is characterized in that: described mixed coal is conventional coking mixed coal, and primarily of bottle coal, rich coal, coking coal, 1/3 coking coal and lean coal composition, mixed coal water ratio is 9 ~ 15%.
3. the energy saving and environment friendly low moisture coke making process of one according to claim 1, is characterized in that: described newly-increased weak caking coal of joining mainly refers to coking behavior is poor, price is low bottle coal and lean coal.
4. the energy saving and environment friendly low moisture coke making process of one according to claim 1, is characterized in that: the dry damping of described coal dust can adopt direct heating or indirect heating manner, and thermal source can comprise steam, heat smoke, electricity or thermal oil.
5. the energy saving and environment friendly low moisture coke making process of one according to claim 1, it is characterized in that: the coal dust of described grade <1mm mixes with newly-increased weak caking coal of joining, shaping without the need to binding agent direct pressing, forming pressure >150kg/cm 2; Type coal shape can be circular, ellipse or square, and overall dimension is no more than 35mm.
6. the energy saving and environment friendly low moisture coke making process of one according to claim 1, is characterized in that: described low moisture binder free typed briquette directly drops in the coal dust of grade >1mm and blending transportation is beneficial to reduce moulded coal breakage rate.
7. the energy saving and environment friendly low moisture coke making process of one according to claim 1, is characterized in that: described low moisture binder free typed briquette accounts for and enters coke oven material gross weight than controlling as <60%.
8. an energy saving and environment friendly low moisture coking system, it is characterized in that: for implementing the claims one of 1 to 7 described energy saving and environment friendly low moisture coke making process, mainly comprise dry humidity control device (2), screening plant (3), metering device (8), mixing device (9), shaped device (10), coke oven arrangement (12), equipment connection mode is: 1# e Foerderanlage (1) outlet is connected with dry humidity control device (2) entrance, dry humidity control device (2) outlet is connected with screening plant (3) entrance, the outlet of screening plant (3) screen overflow is connected with 4# e Foerderanlage (4) entrance, the outlet of screening plant (3) screen underflow is connected with 2# e Foerderanlage (5) entrance, 2# e Foerderanlage (5) outlet is connected with mixing device (9) entrance, 3# e Foerderanlage (6) outlet is connected with buffer bin (7) entrance, buffer bin (7) outlet is connected with metering device (8) entrance, metering device (8) outlet is connected with mixing device (9) entrance, mixing device (9) outlet is connected with shaped device (10), shaped device (10) outlet is connected with 4# e Foerderanlage (4) entrance, 4# e Foerderanlage (4) outlet is connected with coking factory owner coal blending belt (11) entrance, and coking factory owner coal blending belt (11) outlet is connected with coke oven arrangement (12).
9. energy saving and environment friendly low moisture coking system according to claim 8, is characterized in that: described 1# e Foerderanlage (1), 2# e Foerderanlage (5), 3# e Foerderanlage (6) refer to rotary conveyor, scraper conveyor, bucket elevator, machine for zipper or worm conveyor; 4# e Foerderanlage (4) is rotary conveyor.
10. energy saving and environment friendly low moisture coking system according to claim 8, is characterized in that: described dry humidity control device (2) is fixed bed drying device, fluidized bed dryer, vacuum drier or revolving drum moisture eliminator; Screening plant (3) is vibratory screening apparatus or trommel screen; Mixing device (9) is single shaft mixing machine, double-shaft mixer, drum mixer or stirring mixer; Shaped device (10) is common roller briquetting machine.
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