CN109539805A - A kind of processing method of soaring kiln gas - Google Patents

A kind of processing method of soaring kiln gas Download PDF

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Publication number
CN109539805A
CN109539805A CN201811294138.1A CN201811294138A CN109539805A CN 109539805 A CN109539805 A CN 109539805A CN 201811294138 A CN201811294138 A CN 201811294138A CN 109539805 A CN109539805 A CN 109539805A
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CN
China
Prior art keywords
flue gas
processing
gas
furnace cupola
carbon dioxide
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Pending
Application number
CN201811294138.1A
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Chinese (zh)
Inventor
孙荣岳
叶江明
陈凌海
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Nanjing Institute of Technology
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Nanjing Institute of Technology
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Priority to CN201811294138.1A priority Critical patent/CN109539805A/en
Publication of CN109539805A publication Critical patent/CN109539805A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D2017/009Cyclone for separating fines from gas
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/10Reduction of greenhouse gas [GHG] emissions
    • Y02P10/122Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2

Abstract

The present invention relates to a kind of processing method of soaring kiln gas, include the following steps: that dedusting method uses cyclone dust removal Step 1: the flue gas in furnace cupola smoke-box is dusted processing;Step 2: the flue gas after dedusting is carried out cooling processing, cooling processing mode, which is used, carries out heat exchange with cold air;Step 3: the flue gas after cooling is carried out desulfurization process;Step 4: the flue gas after desulfurization is passed through progress carbon dioxide removal processing in calcium hydroxide solution;Step 5: carrying out full combustion in furnace cupola for going the flue gas after removing carbon dioxide to lead to again.This method can will burn in furnace cupola because the CO gas of the not sufficiently combusted generation of fuel is back to furnace cupola again, while increase the carbon monoxide content in flue gas by the processing to flue gas.

Description

A kind of processing method of soaring kiln gas
Technical field
The present invention relates to a kind of flue gas processing method more particularly to a kind of processing methods of soaring kiln gas.
Background technique
Furnace cupola is the important equipment of melting iron in Foundry Production, is poured into sand mold after casting pig is fused into molten iron In after cooling unpack obtain casting.Furnace cupola is a kind of vertical cylinder-shaped smelting furnace, is divided into forehearth and rear furnace.Forehearth divides again For tapping hole, slag notch, cupola well and gap bridge before bell.It is mainly used for iron casting production, also to cooperate pneumatic steelmaking.
The course of work of furnace cupola: first a certain amount of coal is packed into furnace and is used as bed coke, its height is generally at one meter More than.After igniting, bed coke is added into specified altitude, is bed coke height from air port to the top surface of bed coke.Then the fusing of stove is pressed The lime stone prepared, metal charge and coke charge are added from feed opening rate in batches in order.It is kept during entire blow-on Furnace charge top surface is in feed opening lower edge.Blast the air in furnace through air port and occur combustion reaction with bed coke, the high-temperature furnace gas of generation to Upper flowing heats furnace charge, and melts first metal charge on bed coke top surface.As the burning of bed coke is become estranged metal charge Fusing, the bed of material is gradually reduced.After every batch of is load melting, fuel is supplemented by additional coke charge, is kept substantially bed coke height Constant, entire fusion process is carried out continuously.
Lime stone in furnace charge resolves into lime and carbon dioxide under the action of high-temperature furnace gas.Lime is alkaline oxygenated Object, it can and coke in ash content and furnace charge in the acidic materials such as impurity, metal oxide be combined into lower melting-point clinker. The clinker of fusing also falls on down cupola well, and floats on molten iron.
The burning of furnace cupola uses coal, insufficient since fuel arrangement is close, lack of air will lead to burning, in flue gas There are a large amount of CO gas, this gas, which flows into air, will lead to air pollution, can in view of the combustibility of the gas The gas is recycled, heat release is rekindled, increases the utilization rate of fuel.
Summary of the invention
The present invention increases the utilization rate of fuel, while preventing its stream to make full use of the CO gas in flue gas Enter caused pollution in air, provides a kind of furnace cupola flue gas processing method.This method can by furnace cupola because fuel does not fill The CO gas that divided combustion generates is back to furnace cupola again and burns, while increasing flue gas by the processing to flue gas In carbon monoxide content.
The technical solution used in the present invention are as follows: a kind of furnace cupola flue gas processing method includes the following steps
Flue gas in furnace cupola smoke-box is dusted processing by step 1, and dedusting method uses cyclone dust removal;
Flue gas after dedusting is carried out cooling processing by step 2, and cooling processing mode, which is used, carries out heat exchange with cold air;
Flue gas after cooling is carried out desulfurization process by step 3;
Flue gas after desulfurization is passed through progress carbon dioxide removal processing in calcium hydroxide solution by step 4;
Step 5 leads to the flue gas after removing removing carbon dioxide again carries out full combustion in furnace cupola.
Further, flue gas desulfurization uses the desulfurization of calcium carbonate method.
Further, flue gas cool-down processing carries out in heat exchanger, and heat exchanger includes internal pipeline and external pipe, inside Pipeline spirals, and internal pipeline is placed in external pipe, internal pipeline circulation cold air, external pipe circulation flue gas.
Further, the internal pipeline entrance connects air blower, outlet connection bellows, the cold air stream inlet air after heating It is combustion-supporting in case.
Further, explosion-proof valve is arranged in the heat exchanger top.
Further, go the flue gas of removing carbon dioxide that carbonmonoxide detector is set on the channel for flowing into furnace cupola, if Carbon monoxide content is higher than definite value in flue gas, and flue gas leads to furnace cupola, carries out lower than if definite value to flue gas if carbon monoxide content It is discharged into air after carbon monoxide processing.
Beneficial effect caused by the present invention includes: that the flue gas in the present invention first passes around cyclone dust collectors and is dusted, Then the inside sulfur dioxide gas is removed by desulfurizer, removes carbon dioxide by removing carbon dioxide device later, increased Carbon monoxide content in flue gas increases the combustibility of flue gas after recycling, is back to bellows and mixes with the air that air blower is blown into After-combustion, desulfurizer in the present invention are in order to prevent in sweetening process to the shadow of carbon dioxide using calcium carbonate doctor treatment It rings, the carbon dioxide removal device in the present invention is removed by calcium hydroxide solution, is generated after calcium hydroxide absorbing carbon dioxide In the lime stone that calcium carbonate recoverable is filled to cupola shaft, the present invention removes dioxy after first passing around desulfurizer again Changing carbon is to cause the calcium carbonate generated to include calcium sulfate, and then influence in order to avoid sulfur dioxide is reacted with calcium hydroxide solution The purity of calcium carbonate is unfavorable for recycling.
Detailed description of the invention
The structural schematic diagram of furnace cupola in Fig. 1 present invention;
The structural schematic diagram of desulfurizer in Fig. 2 present invention;
The structural schematic diagram of heat exchanger in Fig. 3 present invention;
1, furnace cupola in figure, 11, feed opening, 12, feeder pipe, 13, sieve, 14, ash bucket, 15, smoke-box, 16, shaft, 17, bellows 18, cupola well, 19, baffle, 2, cyclone dust collectors, 3, heat exchanger, 31, cold air channel, 32, cool air inlet, 33, cold air goes out Mouthful, 34, smoke inlet, 35, exhanst gas outlet, 36, First Heat Exchanger, the 37, second heat exchanger, 371, small cooler, 372, big cold But device, 4, desulfurizer, 41, spraying mechanism, the 42, first pond, the 43, second pond, 44, water pump, 5, carbon dioxide removal dress It sets, the 6, first air blower, the 7, second air blower, 8, first pipe, 9, second pipe, 10, third pipeline.
Specific embodiment
Further details of explanation is done to the present invention with reference to the accompanying drawings and detailed description, it should be appreciated that The protection scope of the present invention is not limited by the specific implementation manner.
One of present invention furnace cupola flue gas processing method, includes the following steps
Flue gas in furnace cupola smoke-box is dusted processing by step 1, and dedusting method uses cyclone dust removal;
Flue gas after dedusting is carried out cooling processing by step 2, and cooling processing mode, which is used, carries out heat exchange with cold air;
Flue gas after cooling is carried out desulfurization process by step 3;
Flue gas after desulfurization is passed through progress carbon dioxide removal processing in calcium hydroxide solution by step 4;
Step 5 leads to the flue gas after removing removing carbon dioxide again carries out full combustion in furnace cupola.
As shown in Figure 1, the furnace cupola of the above method is realized, including passing through the connected furnace cupola 1 of flue, cyclone dust removal Device 2, desulfurizer 4 and carbon dioxide removal device 5,1 top of furnace cupola are equipped with feed opening and smoke-box 15, and centre is equipped with shaft 16, 16 lower end of shaft is bellows 17 and cupola well 18, and cupola well 18 is used to store iron liquid, and bellows 17 connect air hose, for blasting air for combustion Material burning, the flue gas after burning rise to smoke-box 15, and feed opening 11 passes through smoke-box 15 by feeder pipe 12 and leads to shaft 16, smoke-box 15 bottoms connect ash bucket 14, and smoke-box 15 connects cyclone dust collectors 2 by first pipe 8, and flue gas is successively flowed to by first pipe 8 Cyclone dust collectors 2 are dusted processing, remove the bulky grain solid object in flue gas, are then carried out at desulfurization by desulfurizer 4 Reason removes the oxysulfide in flue gas, prevents oxysulfide outflow pollution air, while improving the content of other gas componants, Carbon dioxide removal device 5 is subsequently flowed to, for removing the carbon dioxide in flue gas, increases the content of carbon monoxide, keeps away simultaneously Exempt from carbon dioxide in flue gas too high levels, cause to extinguish the blaze, purified flue gas flows to bellows 17 through second pipe 9 and carries out weight It is multiple to utilize, while bellows 17 connect the first air blower 6 by third pipeline 10, the first air blower 6 blasts air into bellows 17, Flue gas carries out CO burning heat release after mixing with air, which, which avoids flue gas and flow directly into air, leads to an oxygen Change carbon pollution, while continuing as furnace cupola 1 using the combustibility of carbon monoxide and heat is provided, improves the utilization rate of fuel.
In order to realize uniform distribution sieve 13 is arranged, sieve 13 rotates, in blanking in the present apparatus below the outlet of feeder pipe 12 In pipe 12 setting can free-open-close baffle 19.
Be stored in desulfurizer 4 in the present invention calcium carbonate perhaps the alkaline solutions such as sodium carbonate by calcium carbonate or Sodium carbonate reacts purifying smoke with oxysulfide, and calcium sulfate with carbon dioxide reaction, does not avoid desulfurizer 4 to carbon dioxide Influence;Calcium hydroxide solution is stored in carbon dioxide removal device 5 in the present invention, calcium hydroxide solution can pass through quick lime It is made, the calcium carbonate i.e. lime stone generated after calcium hydroxide solution and carbon dioxide reaction can be used for lime stone in shaft 16 again Material, so that processing material recycling, avoids waste, reduce costs.
Such as Fig. 2, the desulfurizer 4 in the present invention selects spray desulfurizer, by realizing to gas shower sulphur removal solution Desulfurization, the spray desulfurizer are made of spraying mechanism 41 and water circulation system;The water circulation system includes the first pond 42, the second pond 43 and water pump 44;Second pond 43 is located at 41 lower section of spraying mechanism;First pond 42 and the second water Pond 43 communicates;Water pump 44 is equipped in first pond 42;The water pump 44 is connected by outlet pipe with 41 upper end of spraying mechanism It is logical.
Second pipe 9 in the present invention is equipped with the carbonmonoxide detector for detecting carbon monoxide content, while the Two pipelines 9 lead to carbon monoxide treating unit, if the big Mr. Yu of carbon monoxide content in the flue gas that carbonmonoxide detector detects Flue gas is then led to bellows 17 by value, if content is lower than certain value, flue gas is led to carbon monoxide treating unit, is removed by the device Flue gas is discharged into air after removing carbon monoxide.
Heat exchanger 3 is equipped between cyclone dust collectors 2 in the present invention and desulfurizer 4, for reducing the heat in flue gas, It prevents flue-gas temperature is excessively high from leading to water evaporation in calcium hydroxide solution below, influences the treatment effeciency of carbon dioxide, in heat exchanger 3 Portion, which spirals, cold air channel 31, which blasts outside air by the second air blower 7, external to lead to for flue gas After road, high-temperature flue gas and cold air carry out heat exchange, air temperature is increased, and flue-gas temperature reduces, the cold air stream after heating To bellows 17, cold air is flowed by cool air inlet 32, is flowed out by cold-air vent 33, and high-temperature flue gas is flowed by smoke inlet 34 Heat exchanger, by 35 outflow heat exchanger of exhanst gas outlet, the design achieves heat recycling, save the costs.Flue gas after cooling Lead to desulfurizer 4.
It include First Heat Exchanger 36 and the second heat exchanger 37 in heat exchanger in order to which flue gas sufficiently cools down, such as Fig. 3, first Heat exchanger is air-smoke heat replacing device, and the second heat exchanger is water-smoke heat replacing device, is retouched in the i.e. upper paragraph of First Heat Exchanger The heat exchanger structure stated, high-temperature flue gas carry out heat exchange in First Heat Exchanger, make the wind-warm syndrome into furnace cupola be reduced to 420 DEG C ~ 500℃;Second heat exchanger includes small cooler 371 and big cooler 372, and the inside only has cooling water, and high-temperature flue gas is by the With water coke slurry heat after two heat exchangers, realize that water temperature raising and flue-gas temperature reduce, cooler is pipe type water cooler, is managed interior logical Flue gas manages outer water flowing, and water and flue gas are counterflow heat exchange form, to improve cooling effect, therefore uses two groups of concatenated shapes of cooler Formula, the second heat exchanger can drop to 100 DEG C or less by flue-gas temperature by 450 DEG C.
Entered in 36 cold wind import of First Heat Exchanger by the cold wind that the second air blower 7 is sent, with enter exchanger heat The high-temp waste gas of wind inlet exchanges heat in heat exchanger, so that cold wind is become high-temperature hot-air, hot blast temperature is up to 420 DEG C ~ 500 DEG C Left and right, hot wind flow out from the hot-blast outlet of heat exchanger, are then entered in furnace cupola by pipeline, make the smelting temperature in furnace cupola Up to 1800 DEG C or more, the molten iron of fusing goes out degree from preceding packet stream.Due to the raising of smelting temperature in furnace be conducive to molten iron in furnace take off Sulphur, degasification and slag iron separation, molten iron temperature is up to 1560 DEG C or so.Since the degree of purity of the high molten iron of molten iron temperature is high, reaching Under conditions of identical molten iron temperature, required coke is few, to reach high-quality energy-efficient effect, high conversion efficiency;Due to molten iron temperature Degree is up to 1560 DEG C or so, so can fall iron filings also melting, thawing is high-efficient, and the molten iron quality of production is good.
For the ease of checking 1 fuel situation of furnace cupola, flame-observing hole is set on bellows 17, and flame-observing hole, which is equipped with, sees fire Lid is opened when needing to check the intensity of a fire and sees fire cover, when needing not look at, closes and sees fire cover.It is warm in heat exchanger 3 in order to prevent Spend height, air pressure is excessive to lead to the accidents such as explosion, and explosion-proof valve is equipped at the top of heat exchanger 3, can also be arranged gas pressure detector and Alarm, when air pressure is excessively high, alarm starting is alarmed.
The above is only a preferred embodiment of the present invention, and the present invention is not limited in the content of embodiment.For in this field Technical staff for, can have various change and change within the scope of technical solution of the present invention, made any variation and Change, within that scope of the present invention.

Claims (6)

1. a kind of processing method of soaring kiln gas, it is characterised in that: include the following steps
Flue gas in furnace cupola smoke-box is dusted processing by step 1, and dedusting method uses cyclone dust removal;
Flue gas after dedusting is carried out cooling processing by step 2, and cooling processing mode, which is used, carries out heat exchange with cold air;
Flue gas after cooling is carried out desulfurization process by step 3;
Flue gas after desulfurization is passed through progress carbon dioxide removal processing in calcium hydroxide solution by step 4;
Step 5 leads to the flue gas after removing removing carbon dioxide again carries out full combustion in furnace cupola.
2. the processing method of soaring kiln gas according to claim 1, it is characterised in that: flue gas desulfurization uses calcium carbonate method Desulfurization.
3. the processing method of soaring kiln gas according to claim 1, it is characterised in that: flue gas cool-down processing is in heat exchanger Interior progress, heat exchanger include internal pipeline and external pipe, and internal pipeline spirals, and internal pipeline is placed in external pipe, internal Pipeline flow cold air, external pipe circulation flue gas.
4. the processing method of soaring kiln gas according to claim 3, it is characterised in that: the internal pipeline entrance connection Air blower, outlet connection bellows, the cold air stream after heating enters combustion-supporting in bellows.
5. the processing method of soaring kiln gas according to claim 3, it is characterised in that: the heat exchanger top setting is anti- Quick-fried valve.
6. the processing method of soaring kiln gas according to claim 1, it is characterised in that: the flue gas of removing carbon dioxide is gone to exist It flows on the channel of furnace cupola and carbonmonoxide detector is set, if carbon monoxide content is higher than definite value in flue gas, flue gas leads to punching Its furnace is discharged into air after carrying out carbon monoxide processing to flue gas if carbon monoxide content is lower than definite value.
CN201811294138.1A 2018-11-01 2018-11-01 A kind of processing method of soaring kiln gas Pending CN109539805A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110806113A (en) * 2019-11-25 2020-02-18 北京科技大学 Method and device for reducing energy consumption by introducing gas into submerged arc furnace

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201217665Y (en) * 2008-03-10 2009-04-08 周万山 Novel furnace cupola system for melting carbonaceous ball of iron oxide
JP2010001567A (en) * 2008-06-20 2010-01-07 Ipsen Internatl Gmbh Method and apparatus for heat-treating metallic material
CN104162358A (en) * 2014-07-11 2014-11-26 天津大学 Method for synchronous desulphurization, denitration dedusting and emission reduction of carbon dioxide by fire coal and flue gas
CN204254649U (en) * 2014-11-18 2015-04-08 梁光启 A kind of zero-emission no chimney coal-burning boiler system
CN106401749A (en) * 2016-10-11 2017-02-15 中国华能集团清洁能源技术研究院有限公司 IGCC-based near zero emission coal-fired power generation system and method
CN106679402A (en) * 2017-01-16 2017-05-17 苏州市润达机械制造有限公司 Energy-saving environment-friendly efficient hot blast cupola

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201217665Y (en) * 2008-03-10 2009-04-08 周万山 Novel furnace cupola system for melting carbonaceous ball of iron oxide
JP2010001567A (en) * 2008-06-20 2010-01-07 Ipsen Internatl Gmbh Method and apparatus for heat-treating metallic material
CN104162358A (en) * 2014-07-11 2014-11-26 天津大学 Method for synchronous desulphurization, denitration dedusting and emission reduction of carbon dioxide by fire coal and flue gas
CN204254649U (en) * 2014-11-18 2015-04-08 梁光启 A kind of zero-emission no chimney coal-burning boiler system
CN106401749A (en) * 2016-10-11 2017-02-15 中国华能集团清洁能源技术研究院有限公司 IGCC-based near zero emission coal-fired power generation system and method
CN106679402A (en) * 2017-01-16 2017-05-17 苏州市润达机械制造有限公司 Energy-saving environment-friendly efficient hot blast cupola

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110806113A (en) * 2019-11-25 2020-02-18 北京科技大学 Method and device for reducing energy consumption by introducing gas into submerged arc furnace
CN110806113B (en) * 2019-11-25 2020-08-25 北京科技大学 Method and device for reducing energy consumption by introducing gas into submerged arc furnace

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Application publication date: 20190329