CN1479778A - Method and device for preparation of fuels - Google Patents

Method and device for preparation of fuels Download PDF

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Publication number
CN1479778A
CN1479778A CNA01820385XA CN01820385A CN1479778A CN 1479778 A CN1479778 A CN 1479778A CN A01820385X A CNA01820385X A CN A01820385XA CN 01820385 A CN01820385 A CN 01820385A CN 1479778 A CN1479778 A CN 1479778A
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China
Prior art keywords
grinding
coal
spray
roller
erc
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Granted
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CNA01820385XA
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Chinese (zh)
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CN1245489C (en
Inventor
B・施雷德尔
B·施雷德尔
费尔特
M·米勒
H·乌尔费尔特
W·哈蒂
H·策维
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Erc Radiation Reduction Design LLC
Loesche GmbH
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Erc Radiation Reduction Design LLC
Loesche GmbH
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Publication of CN1479778A publication Critical patent/CN1479778A/en
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Publication of CN1245489C publication Critical patent/CN1245489C/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C21B5/004—Injection of slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Manufacture Of Iron (AREA)
  • Coke Industry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention relates to a method and device for the preparation of fuels by means of a catalyst solution. According to the invention, the costs of raw iron production may be reduced and in particular the consumption of coke reduced, by means of an increase in the directly-fed coal dust and application of low-grade coal or petroleum coke, whereby a catalyst is injected in the form of a solution, which reduces the ignition temperature of the fuel, during the coal milling of coarse coal to give fine coal or coal dust.

Description

The method and apparatus of preparation of fuels
The present invention relates to be used for preparation of fuels according to claim 1 preamble, the method for the coal dust of producing especially for the pig iron, and relate to the device that is used to realize this method according to claim 11 preamble.
WO99/64636 discloses the method for producing the pig iron in blast furnace, wherein according to PCI (coal dust injection) method, coal dust is supplied with by blast orifice together as auxiliary fuel and hot blast and/or oxygen and is answered blast furnace, thereby to reduce coke consumption and to reduce the production cost of the pig iron per ton.For further reducing coke consumption, utilized coal dust with the catalyst additive preparation.The subgroup element zirconium is used in suggestion, molybdenum, and tungsten, manganese, iron, cobalt, nickel, copper, zinc or aluminium, the tin or the lead compound aqueous solution, particularly cupric sulfide solution is as catalyst additive.Except that reducing coke consumption, the advantage of also having pointed out to have the catalyst additive coal dust is as the surrogate of more cheap coal, has reduced the slag growing amount and has reduced particulate emission, simultaneously the quality of the pig iron of Ti Gaoing.
Article on magazine " Steel Technology (steel technology) " " Blast furnaceefficiency enhancer for pulverized coal injection (being used for the blast furnace efficient intensifier booster that coal dust sprays) ", in February, 2000,61 pages reach thereafter, have further described aforesaid method.By blast orifice being used for of supplying with coal dust particle size that part replaces coke less than 75 microns, water content is less than 1%, coal per ton is with 350 to 600 milliliters of catalyst solutions.Supply with by independent device, this device is positioned at the downstream of raw coal feed bin and the upstream (Fig. 2) of MPS grinding machine, by spray catalyst solution preparation raw coal.But also point out that because the corrosive property of catalyst solution, spray equipment must satisfy special requirement, and is necessary to have the cleaning system of cleaned at regular intervals nozzle.
The object of the present invention is to provide preparation of fuels, the method and apparatus of the coal dust of producing especially for the pig iron, described method and apparatus can be saved coke especially simply and effectively, and increases coal tar or the refinery coke that sprays the coal part and utilize lower grade.
Viewpoint from method, this purpose is achieved in that promptly utilizes catalyzer, and this catalyzer reduces the ignition temperature of fuel or improve combustionvelocity under constant temp, and coal is being worn into or is being crushed in the coal dust process, catalyzer is applied on the coal particle with the catalyst solution form especially.Pei Zhi coal particle or coal dust can directly be supplied with the blast orifice of blast furnace like this, will be heated to about 1250 ℃ hot blast simultaneously or oxygen is supplied with the blast orifice of blast furnace in blast preheater, or supply with feed bin and carry out intermediate storage.
Have been found that with ERC Emissions Reduzierungs Concept limited liability company sell with ProductName carbamin5010 and in DE 198 00 873 C2 disclosed catalyzer prepare, can reduce the ignition temperature and the accelerate combustion of fuel.Ignition temperature reduction and burning quicken to mean that the residual coke igniting is faster and burning is faster in blast orifice, and promptly coke almost completely burns in blast orifice.Except oxygen partial pressure, the mesh-of-grind of blast orifice temperature (radiant section) and coal, enter temperature and moisture content with it, these factors have determined the ejection efficiency of coal dust and the influence that STRENGTH ON COKE consumes thereof, but also have determined the iron quality and the quantity of producing.
Ignition temperature and burning behavior are by the place of production decision of used coal.Carbonization or maceral composition play a decisive role with blast orifice.The volatility of coal guarantees that partly residual coke will be lighted a fire as long as residual coke reaches ignition temperature.In blast orifice, the main radiation by the blast orifice wall of rising of actual coke temperature is thermogenetic, rather than burning by volatile component realizes.The after-flame of residual coke is subjected to the internite part retarded combustion of dynamic inhibition, particularly coal.
Play the additive of katalysis, promptly catalyzer can reduce the residual coke ignition temperature, thereby realizes better burnouting.Coal has burnouted time decreased, and owing to the time of burnouting is shorter, so the increase of coal emitted dose, thus can use the lower coal of volatility or also can use the lower refinery coke of volatility.
Described the additive that plays katalysis of ERC in DE 198 00 873 C2, the back is called the ERC additive.It is as comprising the cerium salt of organic acid and/or mineral acid and the aqueous solution of molysite, and the pH value is less than 7 simultaneously, and can comprise wetting agent and/or neutralizing agent.Please refer to composition and the concentration and the Application Areas of the catalyst solution that provides in the above-mentioned patent specification.
According to this patent documentation, known catalysts solution is used for the discharging of carbonaceous fuel at burning and/or drying operation and/or thermal process minimizing pollutent, and can before burning, add solid fuel to, as coal, timber, biofuel in waste oil and the heavy oil, and adds in the air of other liquid fuel or supply.Also in the blast furnace process, mentioned the effect that reduces pollutent about blast orifice.The manner of formulation of fuel is not described.
A special advantage according to the inventive method is to have reduced the formation of nitrogen oxide like this with the coal dust of lower oxygen excess burning preparation in blast orifice.
Can in the roller shredder, use catalyst solution, particularly particularly advantageously prepare coal dust with the ERC additive, raw coal or refinery coke stand to grind in this shredder and drying treatment, are ground into coal dust and by fluid, particularly hot gas is supplied with the sorter that is positioned at the grinding chamber top.
Preferably catalyst additive sprays or sprays with 5 to 30 ℃ temperature as the aqueous solution and grinds in the sorting chamber, and the temperature in the described chamber is lower than boiling temperature or decomposition temperature.
Thereby the viewpoint of equipment has been found that to grinding machine, particularly to the roller shredder for example LOESCHE wind is swept the interior ERC of injection of roller shredder additive and can be prepared the fuel pellet of crushing especially effectively.Suppose crushing material-fluid stream in the LOESCHE scavenging roller shredder and at least one spray equipment and spray nozzle direction corresponding layout together, helps moistening and/or permeates coal or coke granule.Owing to the crushing process, the coal surface obviously increases, and this has produced much higher coverage density on reaction surface, and the hole that exposes can moistening better or infiltration.
A special advantage is for the ERC additive, can use own known jet apparatus in the roller shredder.This device can be positioned at and grind the roller top, perhaps between two grinding rollers that face with each other, perhaps is in about 120 ° angle.Spray angle α can be between 10 to 70 °, preferably before 60 to 70 °, and can be roughly perpendicular to or carry out orientation along the direction of grinding roller or sorter.Advantageously arrange two devices in grinding shell, spray direction and spray angle are identical or different.
Fundamentally, in the grinding chamber and sorter of shredder, device can be arranged by any imaginabale spray angle.At least one device or nozzle should be located by this way, promptly have been positioned on the lapping machine that is based upon on abrasive disk or the grinding alms bowl coal or the coke abrasive material of quantitative there enter catalyst liquid and preparation.When spray equipment and excessive material funnel are in same horizontal plane, preferably select and tangent air blast direction or the injection direction of funnel, Gu so that spray liquid-particle mist with spiralling to sorter.This has been avoided with catalyzer moistening excessive material hopper walls, and avoids the knot phenomenon of determining, and particularly on described wall these situations can take place when corresponding high injection pressure.
Suitable is the supply of ERC additive as coal to be ground, and the function of its supply amount and liquid velocity is controlled.The ERC additive that for example is stored in the container is supplied with by supply line, and before spraying, by adding water with necessary in all cases concentration obtain solution.Can spray by pressurized air, suitable pressure is about 2 to 10 crust.
Except by replacing more expensive coke or coal to reduce coke consumption with more cheap coal tar or refinery coke and when producing the pig iron, reducing final these advantages of cost, also reduced dust emissions and improved iron quality.Can reduce combustion air or oxygen, so just reduce the formation of nitrogen oxide.The difference of more cheap and your coal is particularly in their volatile matter ratio and their ash oontent aspect.The volatile matter content of cheap coal is lower, is less than 25 to 30% usually, and the ash oontent height, usually above 7 to 8%.Reduce dust emissions, promptly reduce the discharging of unburn cigarette ash, cause power loss to reduce and cause lower with clean the relevant cost of blast furnace gas need considerable technology and energy to spend because remove cigarette ash.Thereby the minimizing of soot emissions shows the final burning quality that sprays the coal amount and has shown the catalyst efficiency that uses.
Below with reference to accompanying schematic figure the present invention is described in more detail, wherein:
Fig. 1 passes the part longitudinal section that the wind that has spray equipment is swept the roller shredder.
Fig. 2 has the schematic representation that the wind of two spray equipments is swept the roller shredder.
Fig. 3 has four, three and two and grinds rollers for passing to Fig. 5, and the wind that all has two spray equipments is in each case swept the cross section of roller shredder.
Fig. 1 shows in detail wind and sweeps roller shredder 2.The grinding roller 4 that wherein only shows one rolls on grinding stage 3.A blade or louver rings 5 are provided on the circumference of grinding stage 3, and hot gas 13 grinds and sorting chamber 12 to be flowed into by the predetermined eddy current of blade rake by ring 5, and is ground the abrasive material of roller 4 crushing with abrasive material-fluid stream 6 to sorter 7 supplies.Do not have the material of fully crushing to fall back on the grinding stage 3 and further crushed by excessive material funnel 8.Particulate, the product of promptly finishing 9 come out from sorter 7 by unshowned particulate exhaust outlet and are supplied to the unshowned blast orifice of unshowned shaft furnace or are supplied to unshowned feed bin as intermediate storage mean.
Coal grain with the abrasive material that installs 10 pairs of risings-fluid stream 6 is prepared, and device 10 is configured to burn to improve to grinding-sorting chamber spray or jet catalyst solution, especially sprays the ERC additive.These devices 10 can be positioned at the top of grinding roller 4 and/or be in same horizontal plane with grinding roller 4, particularly are higher than grinding stage 3 slightly or grind edge of table, and can be fixed on the mill shell 11 especially.At least one of spray equipment 10 should point to grinding stage 3, and prepares to set up lapping machine on grinding stage 3.Shared supply line 18 can be supplied catalyst solution.
Device is 10 corresponding with waterworks basically, sweeps at LOESCHE wind to be used to reduce the temperature of abrasive material in the roller shredder or for the consideration on the safety.Advantageously described known waterworks can be used for spraying the ERC additive.
Can be lower than 95 ℃ by the temperature of installing the 10 ERC additives that spray.Injection is undertaken by pressurized air 14, and pressurized air is supplied to device 10 with the pressure of 2 to 10 crust.The spray angle α of the spray equipment 10 of top horizontal direction is preferably between 60 ° and 70 °, and the spray angle of the spray equipment 10 of bottom depends on the inclination angle of mouth spray.
Particularly advantageous is to allow the spray equipment 10 and the bottom of excessive material funnel 8 be in same level because this can cause fully preparation rise or on sweep the abrasive grain of abrasive material-fluid stream 6.In Fig. 1, also have one to be in the spray equipment 10 of same horizontal plane with grinding roller 4.This device is used in particular for preparing the abrasive material and the abrasive grain that is centrifuged on grinding stage 3 edges on the grinding stage 3.In addition, hot gas 13 takes up the catalyst solution of spray, and abrasive grain can be by moistening or infiltration in the abrasive material that makes progress-fluid stream 6 like this.
Fig. 2 is shown schematically in wind and sweeps roller shredder 2 very much, and this shredder has two and is positioned at the spray equipment 10 that grinds roller 4 tops, wherein only shows one and grinds roller 4.Spray equipment 10 is fixed on the shredder shell 11 and by supply line 15 and links to each other with unshowned pump group.The ERC additive is stored in the unshowned fuel tank, and before being supplied to the pump group with the regulation the ratio dilute with water.Closuremember 16 and magnetic valve 17 allow according to the coal amount of adding and the speed control dosage of hot gas.
Also have a spray equipment 10 directly over unshowned grinding stage, the direction of its nozzle is for making by using the moistening lapping machine of catalyst liquid.
Fig. 3 is the cross section that passes roller shredder 2, and wherein shredder 2 has four grinding rollers 4 and two spray equipments 10.Spray equipment 10 is positioned at the centre of two grinding rollers 4 in each case substantially and faces with each other, its direction is for making the angular bisector of spray angle α (with reference to Fig. 1 and 2) form secant, thereby in two spaces of grinding between the roller 4 and in shredder, prepare the coal particle of abrasive material-fluid stream in the heart.
Spray equipment 10 can suitably be located like this, promptly has the tangential direction of spray angle.Like this, grinding roller zone and excessive material funnel shell (not shown) can be by not moistening or only by moistening very limitedly, so caking phenomenon can not take place.Tangential spray equipment 10 is shown in broken lines, and can arrange in addition except the spray equipment 10 of basic radial location, or alternative radial spray equipment and being on the different height.
Fig. 4 shows the wind that have three grinding rollers 4 and two spray equipments 10 and sweeps roller shredder 2.Spray equipment 10 is arranged in two spaces in three intermediate spaces that grind between the roller 4 and to intermediate space spray ERC additive prejudicially, and direction is to be basically parallel to the medial surface of one of two grinding rollers 4 and to the shredder center position.
Have two according to the roller shredder 2 of Fig. 5 and grind rollers 4 and 10, two spray equipments of two spray equipments face with each other, but arranged off-centre is ground between the roller 4 at two.Except that the spray equipment 10 of Figure 4 and 5 or as an alternative, can also have tangential spray equipment 10 shown in broken lines in Fig. 3.
ERC can supply with by the ratio of 0.2 to 1 liter of coal per ton of spray equipment 10 usefulness, and wherein Xi Shi ratio is about 1: 10.Injection is carried out with the pressurized air of about 2 to 10 crust.Spray angle α can be 10 ° to 70 °, preferably 60 ° to 70 °.
Pass through the coal dust of blast furnace blast orifice supply preparation with the speed of about 200 meter per seconds.Have been found that it is 4 to 5 milliseconds that coal sprays the afterflaming time afterwards, the ERC additive concentration is about 30/1000000ths to 50.

Claims (20)

1. use the particularly method of coal dust of catalyst preparation fuel, in the blast orifice internal combustion, it is characterized in that when described coal dust is made the pig iron in blast furnace,
The catalyzer that reduces ignition temperature or improve fuel burn rate when steady temperature is supplied to coal particle when raw coal is ground to form duff or coal dust, be to be applied on the coal particle specifically.
2. according to the method described in the claim 1, it is characterized in that the catalyzer that uses is the ERC additive, it is adapted at reducing in the combustion processes of carbonaceous material and/or drying process and/or the thermal process discharging of pollutent.
3. according to the method described in the claim 2, it is characterized in that the ERC additive is ejected in grinding-sorting chamber (12) as solution, solution be included in the pH value less than in 7 the aqueous solution as the cerium and the iron of organic acid salt and/or inorganic acid salt.
4. according to the method described in claim 2 or 3, it is characterized in that raw coal is ground having in grinding stage (3) is gone up the roller shredder (2) of the grinding roller (4) that rolls, at grinding stage (3) and/or grind roller (4) top and supply the ERC additive.
5. according to described method one of in the claim 2 to 4, it is characterized in that raw coal is swept in the roller shredder at a wind that has an integrated sorter (7) and a grinding-sorting chamber (12) stands grinding-drying process, and the ERC additive is fed to grinding-sorting chamber (12) with the temperature that is lower than 100 ℃.
6. according to the method described in the claim 5, it is characterized in that the ERC additive is fed to grinding-sorting chamber (12) with about 10 ° to 70 ° spray angle α.
7. according to the method described in claim 5 or 6, it is characterized in that the ERC additive level and spray in grinding-sorting chamber (12) tangently with excessive material funnel (8) lower region.
8. according to described method one of in the claim 2 to 7, it is characterized in that according to the raw coal of supply and the supply of flow rate control ERC additive.
9. according to described method one of in the claim 2 to 8, it is characterized in that with pressurized air with the ERC additive injection in grindings-sorting chamber (12), and pressurized air is to supply with the pressure of 2 to 10 crust.
10. according to described method one of in the claim 2 to 9, it is characterized in that the ERC additive is that Dilution ratio is about 1: 10 with the ratio supply of 0.2 to 1 liter of coal per ton.
11. especially for the pig iron coal dust of producing and the device of realizing according to the method for one of claim 1 to 10, it is characterized in that with catalyst preparation fuel
A roller shredder that is used for raw coal or coke are ground to form duff or coal dust is arranged, particularly wind is swept roller shredder (2), this shredder has at grinding stage (3) goes up a plurality of grinding rollers (4) and an integrated sorter (7) that rolls, a shredder shell (11), a grinding-sorting chamber (12) and a raw coal feeding mechanism, and duff or coal dust exhaust outlet (9) and at least one are arranged in the device (10) in grinding-sorting chamber (12), by this device (10) can grind and assorting room in to coal particle supply catalyzer to reduce ignition temperature or in identical temperature raising rate of combustion, catalyzer is applied on the coal particle especially.
12., it is characterized in that this device construction is spray equipment (10) and is positioned at grinding stage (3) and/or the top of grinding roller (4) according to the device described in the claim 11.
13. according to the device described in claim 11 or 12, it is characterized in that spray equipment (10) by in grinding-sorting chamber (12) water spray device form.
14., it is characterized in that the spray angle α of spray equipment (10) is about 10 ° to 70 ° according to the described device of one of claim 11 to 13.
15. according to the described device of one of claim 11 to 14, it is characterized in that providing two spray equipments (10), in plan view, these two spray equipments all are positioned at two in each case and grind between the roller (4).
16., it is characterized in that spray equipment (10) center or arrange prejudicially between two adjacent grinding rollers (4) according to the device described in the claim 15.
17., it is characterized in that catalyzer can be used as solution and is supplied to spray equipment (10) by the pump group, and the blast injection or the spray of available 7 to 10 crust according to the described device of one of claim 11 to 16.
18. according to the described device of one of claim 11 to 17, it is characterized in that spray equipment (10) is horizontally disposed and directed like this on the direction at intermediate space that grinds roller (4) and shredder center, promptly based on the cross section of roller shredder (2), the angular bisector of spray angle α forms secant.
19., it is characterized in that according to the described device of one of claim 11 to 18
At least one spray equipment (10) points to grinding stage (3) and points on the lapping machine of setting up.
20. according to the described device of one of claim 11 to 18, the direction that it is characterized in that spray equipment (10) is for tangent with excessive material funnel (8).
CNB01820385XA 2000-10-11 2001-10-09 Method and device for preparation of fuels Expired - Fee Related CN1245489C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10050332.2 2000-10-11
DE10050332A DE10050332C2 (en) 2000-10-11 2000-10-11 Method and device for preparing fuels

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CN1479778A true CN1479778A (en) 2004-03-03
CN1245489C CN1245489C (en) 2006-03-15

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EP (1) EP1337609A1 (en)
JP (1) JP2004511654A (en)
KR (1) KR20030072333A (en)
CN (1) CN1245489C (en)
AU (1) AU2002215014A1 (en)
BR (1) BR0114625A (en)
DE (1) DE10050332C2 (en)
RU (1) RU2265644C2 (en)
WO (1) WO2002031091A1 (en)

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CN117483060A (en) * 2023-12-29 2024-02-02 河北红光燃料有限责任公司 Coal-fired pulverized coal grinding equipment
CN117483060B (en) * 2023-12-29 2024-03-15 河北红光燃料有限责任公司 Coal-fired pulverized coal grinding equipment

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DE10050332C2 (en) 2003-11-27
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KR20030072333A (en) 2003-09-13
RU2265644C2 (en) 2005-12-10
CN1245489C (en) 2006-03-15
WO2002031091A1 (en) 2002-04-18
AU2002215014A1 (en) 2002-04-22
EP1337609A1 (en) 2003-08-27
BR0114625A (en) 2003-07-15

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