CN106520148B - Water-gas preparation system based on Dry Quenching - Google Patents
Water-gas preparation system based on Dry Quenching Download PDFInfo
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- CN106520148B CN106520148B CN201610957402.XA CN201610957402A CN106520148B CN 106520148 B CN106520148 B CN 106520148B CN 201610957402 A CN201610957402 A CN 201610957402A CN 106520148 B CN106520148 B CN 106520148B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of water-gas preparation system based on Dry Quenching, including sequentially connected crusher, fluidized bed, coke oven and coke dry quenching furnace, dried medium entrance connection of the coke dry quenching furnace circulating gas outlet through waste heat boiler, circulating fan and fluidized bed, the dried medium outlet of fluidized bed are connected through expansion chamber or cyclone dust collectors and the circulating gas entrance of coke dry quenching furnace；The circulating gas of the expansion chamber or cyclone dust collectors is exported to coke dry quenching furnace circulating gas entrance pipeloop and is equipped with the coal gas outlet connecting with gas cleaning system.Present system is simple, it is reliable for operation, can effectively recycle low temperature exhaust heat, by-product gas, to coking coal efficient drying, extend service life of equipment and soot emissions, environmentally friendly be greatly decreased.
Description
Technical field
The present invention relates to a kind of coal chemical technology, specifically a kind of water-gas preparation system based on Dry Quenching.
Background technique
Dry Quenching originates from Switzerland, and by the Development Technology relative maturity of over half a century, reliable for operation, equipment is got over
Come more enlarged.It is developed so far, although there is different forms, its typical process flow is similar, is using lazy
Property gas by a kind of red burnt cooling coke quenching method: it is red it is burnt be packed at the top of coke dry quenching furnace, cryogenic inert gas is roused by circulating fan
Enter the cooling red coke of coke dry quenching furnace, coke after cooling is that is, dry to put out cold burnt (300 DEG C of <) from the discharge of coke dry quenching furnace bottom, absorbs sensible heat
High temperature inert gas removes coarse granule coke breeze through primary dedusting and enters waste heat boiler progress heat exchange, and boiler generates steam for sending out
Electricity.Inert gas after cooling removes fine grained coke breeze through final dusting, then is pressurizeed by circulating fan, cooling through feed water preheater
To after about 130 DEG C, coke dry quenching furnace is blasted by circulating fan again, inert gas is recycled in closed system.
There is following all various problems for the main process:
(1) for the coke temperature of environmental system discharge at 150 DEG C or more, the sensible heat containing about 0.2GJ/t- coke enters environment damage
It loses, not only focusing process system belt generates thermal etching, goes back the working environment of the burnt processing region of severe exacerbation；
(2) gas-circulating system negative pressure section can leak into a small amount of air, O2It will be generated with coke gasification reaction by red focus layer
CO2, CO2It can be reduced into CO again in coke layer high-temperature region, with increasing for cycle-index, CO concentration is higher and higher in recyclegas.
In addition, coke remaining fugitive constituent is being precipitated always, the pyrogenous origin H of coke2、CO、CH4Deng being also all inflammable and explosive ingredient.These
Outlet after flammable group of burning is both the waste of the energy, or the source of pollution；
(3) leakage of waste heat boiler causes the moisture in recyclegas to increase, the water that steam is generated in coke layer high-temperature region
Outlet after gas-fired, leads to energy waste；
(4) the burnt dust content of furnace roof dress is big, temperature is high, and the sensible heat that flue dust carries fails effective recycling.
On the other hand, enter the moisture in furnace coking coal containing 10% or so, into carbonization chamber process of coking, the moisture is most
Coke oven is left in the form of raw coke oven gas eventually, consumes thermal energy about 0.585GJ/t- coal.In order to reduce energy consumption, reduction coking wastewater is generated,
Many coal conditioning techniques are developed, such as used Precarbon method, Simcar method, Coaltek method are adopted by foreign countries.It is domestic a small number of
Coke-oven plant is controlled moisture between 6~8% using coal humidifying technology (CMC), and selecting reason is coal charge in this moisture model
Dust emission in enclosing is controllable, and the heat of coke oven exhaust gas is only capable of being dried to numerical value here.The as-fired coal of most coke-oven plants
Moisture relies primarily on the moisture controlled into factory's feed coal, and by coal yard heap volume blending formed relatively stable cooperation moisture content of coal into
Row enters furnace coking, almost without the means of control moisture in actual mechanical process.
In order to reduce the pretreatment cost into furnace coking coal, make full use of more than the unemployed waste heat in Dry Quenching
Can, effective utilization ways need to be sought.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, provide a kind of system it is simple, it is reliable for operation, can effectively return
Receive low temperature exhaust heat, by-product gas, to coking coal efficient drying, extend and service life of equipment and soot emissions be greatly decreased, to ring
The water-gas preparation system based on Dry Quenching of border close friend.
Present system includes sequentially connected crusher, fluidized bed, coke oven and coke dry quenching furnace, the coke dry quenching furnace circulating gas
The dried medium entrance connection through waste heat boiler, circulating fan and fluidized bed is exported, the dried medium of fluidized bed is exported through settling
Room or cyclone dust collectors and the circulating gas entrance of coke dry quenching furnace connect；The outlet of the circulating gas of the expansion chamber or cyclone dust collectors
The coal gas outlet connecting with gas cleaning system is equipped with to coke dry quenching furnace circulating gas entrance pipeloop.
The feeding inlet of the crusher is connect with festoon drier discharge port.
The dust outlet of the expansion chamber or cyclone dust collectors is connect with pressure ball system or with blast furnace blowing coal-hole.
The dried medium entrance of the festoon drier connects through the dress coke flue dust dust collection pipe of disappear detonation burner and coke dry quenching furnace
It connects.
The dried medium entrance of the festoon drier is connect with the coke oven flue gas outlet of coke oven horizontal flue.
Inventor makees the deficiency that hot complementary energy fails effective recycling to low temperature existing for existing dry quenching system, is not changing
Under the premise of realization has dry coke quenching main process, following improvement has been made: (1) substituting original circulation inertia using circulating gas
Quenching medium of the gas as dry quenching system, while also changing former circulation route, the out circulating gas pair of dry quenching system
Broken coking coal is dried, and recycles the waste heat in circulating gas effectively, and loopback enters the circulation of dry quenching system
The temperature of coal gas can be down to 100 DEG C -110 DEG C, to further reduced the tapping temperature of cold coke, tapping temperature can be down to 150
DEG C hereinafter, reduce cold burnt to the thermal damage for transporting burnt belt, service life of equipment is extended.(2) circulating gas is sent into fluidized bed
Broken coking coal is dried, can be improved drying efficiency and efficiency, the ash-laden gas of generation recycled after dedusting into
Enter in dry quenching system and exchange heat, there is no the pollution problem of outlet flue dust after fluidized bed out, the discharge for thoroughly solving PM2.5 is asked
Topic, it is environmentally friendly；(3) although there are reactions various in the dry quenching system described in background technique to lead to the CO (H also contained2、
CO、CH4Deng) accumulation the problem of, due to inventor it is creative quenching medium has been changed to circulating gas by circulated inert gas,
This technical problem becomes beneficial technical effect just；Additionally, due to the circulation route for changing circulating gas, coal is recycled
When gas is dried in a fluidized bed, the moisture content in coking coal can be absorbed, these steam directly enter dry quenching system with circulating gas
It reacts to form water-gas with red coke afterwards, so that circulating gas amount is on the basis of meeting circulation route demand, moreover it is possible to
Surplus gas is generated, additional economic benefit is produced, thermal energy, non-exhaust emission, energy conservation drop are sufficiently recycled in entire cyclic process
It consumes, is environmentally friendly.Also, the reaction process of above-mentioned water-gas is an endothermic process, is also beneficial to quickly putting out for coke dry quenching furnace
It is burnt.(4) being down to 3% to effectively control the water content of coal controls out the circulating gas of waste heat boiler hereinafter, inventor passes through
Temperature, is conducive to the dry tenacity for improving fluidized bed, and the water content for going out coking coal in fluidized bed is down to 3% hereinafter, even more
It is low.(5) it when the water in circulating gas enters dry quenching system, can react with coke, according to gas-solid reaction mechanism, coke
Water gas reaction can preferentially occur for the fine coke breeze on surface, i.e., consume the fine dusts on coke surface, preferentially so as to improve coke
Charcoal quality reduces fine powder coke content, improves product quality.
Further, fill that burnt flue dust dustiness is big, temperature is high for furnace roof, the sensible heat that flue dust carries fails effectively to recycle benefit
With the problem of, this part flue dust is sent by inventor disappear the burnt dirt of quick-fried burner combustion oxygen depleted and part after, and come from
The coke oven flue gas of coke oven horizontal flue is sent into festoon drier together as dried medium, so that the waste heat of this part of flue dust obtains
To effective recycling.
Present system is simple, reduces out the temperature of the cold coke of dry quenching system, recycles cold burnt sensible heat about 0.1GJ/t- more
Coke also accordingly slows down the cold burnt thermal etching to travelling belt, along the service life for having grown belt；Creative has used circulating gas
Original inert gas is replaced, the discharge of PM2.5 is reduced, further recycles the waste heat of 0.4GJ/t- coke or more, while going back by-product
Coal gas improves coke quality；The drying effect and efficiency of coking coal are improved, coal water content is down to 3% hereinafter, dry thermal energy
It is further energy-saving from system hypothermia waste heat.
Detailed description of the invention
Fig. 1 is present system figure.
Wherein, 1- festoon drier, 2- crusher, 3- fluidized bed, 4- expansion chamber or cyclone dust collectors, 5- blast furnace blowing library
Or pressure ball system, 6- coke dry quenching furnace, 7- waste heat boiler, 8- disappear detonation burner, 9- coke oven, 10- deduster, 11- coal gas outlet,
12- circulating fan.
Specific embodiment
Explanation is further explained to present system with reference to the accompanying drawing:
Referring to Fig. 1, the present invention includes sequentially connected festoon drier 1, crusher 2, fluidized bed 3, coke oven 9 and dry puts out
The circulating gas outlet of furnace 6, the coke dry quenching furnace 6 connects through the dried medium entrance of waste heat boiler 7 and circulating fan 12 and fluidized bed 3
It connects, the dried medium outlet of fluidized bed 3 is connect through expansion chamber or cyclone dust collectors 4 with the circulating gas entrance of coke dry quenching furnace 6, described
The outlet of the fine coal of expansion chamber or cyclone dust collectors 4 is connect with pressure ball system or blast furnace blowing coal-hole 5；The expansion chamber or whirlwind remove
The pipeloop that the circulating gas of dirt device 4 is exported to coke dry quenching furnace 6 circulating gas entrance is equipped with to be connect with gas cleaning system
Coal gas outlet 11.Dress coke cigarette of the dried medium entrance of the festoon drier 1 through 6 top of detonation burner 8 and coke dry quenching furnace that disappears
The connection of dirt dust collection pipe.The dried medium entrance of the festoon drier 1 also with the coke oven flue gas outlet of coke oven horizontal flue
Connect (not shown).The exhanst gas outlet of the festoon drier 1 and crusher 2 is connect with deduster 10.
Technical process explanation: coking coal (water content 10wt%) is first come from the horizontal cigarette of coke oven in festoon drier 1
The coke oven flue gas in road is dried, and water content drops to 7-8wt%, is then crushed to 3mm through crusher 2 hereinafter, refining after broken
Coking coal, which is sent into fluidized bed 3, to be fluidized, dries, is classified, dry to water content 3wt% hereinafter, and being classified by circulating gas
To rough coal grain (partial size 0.3-3mm) and fine breeze (partial size < 0.3mm), obtained after rough coal grain feeding 9 coking of coke oven red
Coke, red burnt coke dry quenching furnace 6 of being sent into are obtained cold burnt discharge of the temperature lower than 150 DEG C after circulating gas quenching；Dry quenching system 6 out
Circulating gas (900 DEG C of temperature) enters 7 byproduct steam of waste heat boiler, out the circulating gas (180-230 DEG C of temperature) of waste heat boiler 7
Fluidized bed 3 is sent into coking coal fluidisation, dry, classification after being crushed through circulating fan 12, and the circulating gas of fluidized bed 3 contains greatly out
It measures fine breeze (partial size < 0.3mm), after 4 dedusting of expansion chamber or cyclone dust collectors, most of loopback coke dry quenching furnace 6 is to red Jiao Jinhang
Quenching, fraction is drawn through coal gas outlet 11 is sent into coal gas dust removal purification system as by-product gas；Through expansion chamber or whirlwind
The fine coal that dust settler 4 is isolated is sent into pressure ball system or blast furnace blowing coal-hole 5.It is gathered dust by filling burnt flue dust at the top of the coke dry quenching furnace 6
The burnt flue dust of the dress that pipeline the is drawn detonation burner 8 that disappeared is burnt after oxygen depleted and part coke dirt and from coke oven horizontal flue
Coke oven flue gas is sent into festoon drier 1 together as dried medium.Flue gas from the festoon drier 1 and crusher 2 is sent
Enter qualified discharge after 11 dedusting of deduster.
For producing the 6m coke oven production in 55 hole of burnt 1,100,000 tons of burnt 2 per year, after applying the present invention, add up to recovery waste heat
It is more than 0.4GJ/t- coke, by-product gas 10000m3/ it is more than hour；Coking coal is down to 3% hereinafter, subtracting into water content before coke oven
Few 70% or more coking wastewater yield.
Claims (5)
1. a kind of water-gas preparation system based on Dry Quenching, including sequentially connected crusher, fluidized bed, coke oven and dry put out
Furnace, which is characterized in that the coke dry quenching furnace circulating gas exports the dried medium entrance through waste heat boiler, circulating fan and fluidized bed
The dried medium outlet of connection, fluidized bed is connected through expansion chamber or cyclone dust collectors and the circulating gas entrance of coke dry quenching furnace；It is described
The circulating gas of expansion chamber or cyclone dust collectors is exported to coke dry quenching furnace circulating gas entrance pipeloop and is equipped with and gas purification
The coal gas outlet of system connection.
2. the water-gas preparation system based on Dry Quenching as described in claim 1, which is characterized in that the crusher enters
Material mouth is connect with festoon drier discharge port.
3. the water-gas preparation system based on Dry Quenching as claimed in claim 1 or 2, which is characterized in that the expansion chamber
Or the dust outlet of cyclone dust collectors is connect with pressure ball system or with blast furnace blowing coal-hole.
4. the water-gas preparation system based on Dry Quenching as claimed in claim 2, which is characterized in that the festoon drier
Dried medium entrance through disappear detonation burner and coke dry quenching furnace dress coke flue dust dust collection pipe connect.
5. the water-gas preparation system as claimed in claim 2 or 4 based on Dry Quenching, which is characterized in that the annular is dry
The dried medium entrance of dry machine is connect with the coke oven flue gas outlet of coke oven horizontal flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957402.XA CN106520148B (en) | 2016-10-27 | 2016-10-27 | Water-gas preparation system based on Dry Quenching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957402.XA CN106520148B (en) | 2016-10-27 | 2016-10-27 | Water-gas preparation system based on Dry Quenching |
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| CN106520148A CN106520148A (en) | 2017-03-22 |
| CN106520148B true CN106520148B (en) | 2019-03-15 |
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| CN201610957402.XA Active CN106520148B (en) | 2016-10-27 | 2016-10-27 | Water-gas preparation system based on Dry Quenching |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110813006A (en) * | 2019-12-02 | 2020-02-21 | 中冶焦耐(大连)工程技术有限公司 | Waste gas waste heat recovery and purification process of coke oven gas heating system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232039Y (en) * | 1995-12-11 | 1996-07-31 | 康成 | Vertical continuous coke oven |
| CN102433142A (en) * | 2011-10-21 | 2012-05-02 | 山东天力干燥股份有限公司 | Quality-improving technique combining low-rank coal pneumatic drying with multi-tube revolving destructive distillation and system for same |
| CN103965922A (en) * | 2013-01-31 | 2014-08-06 | 神华集团有限责任公司 | Semi-coke dry quenching method, semi-coke product and coal pyrolysis system |
| CN105907413A (en) * | 2016-05-04 | 2016-08-31 | 无锡亿恩科技股份有限公司 | Low-temperature carbonization process for low-order pulverized coal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH068411B2 (en) * | 1985-08-05 | 1994-02-02 | 新日本製鐵株式会社 | Coke dry fire extinguishing equipment |
-
2016
- 2016-10-27 CN CN201610957402.XA patent/CN106520148B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232039Y (en) * | 1995-12-11 | 1996-07-31 | 康成 | Vertical continuous coke oven |
| CN102433142A (en) * | 2011-10-21 | 2012-05-02 | 山东天力干燥股份有限公司 | Quality-improving technique combining low-rank coal pneumatic drying with multi-tube revolving destructive distillation and system for same |
| CN103965922A (en) * | 2013-01-31 | 2014-08-06 | 神华集团有限责任公司 | Semi-coke dry quenching method, semi-coke product and coal pyrolysis system |
| CN105907413A (en) * | 2016-05-04 | 2016-08-31 | 无锡亿恩科技股份有限公司 | Low-temperature carbonization process for low-order pulverized coal |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170703 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan Applicant before: WUHAN IRON AND STEEL CORPORATION |
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