Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B5/00—Making pig-iron in the blast furnace
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
  • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K2201/00—Pretreatment of solid fuel
  • F23K2201/50—Blending
  • F23K2201/505—Blending with additives

Definitions

• the present invention improves the transportability of pulverized coal blown from the injection port of a metallurgical furnace or a combustion furnace, improves the transportability of pulverized coal that enables a large amount of pulverized coal to be stably injected, and a metallurgical furnace or a metallurgical furnace using the same.
• the present invention relates to a method of operating a combustion furnace.
• coal is being reviewed as an alternative to heavy oil as fuel for combustion furnaces such as boilers.
• Examples of the type of coal used in combustion furnaces include CWM (coal-water slurry), COM (coal-fuel-oil blended fuel), pulverized coal, etc.
• CWM coal-water slurry
• COM coal-fuel-oil blended fuel
• pulverized coal combustion furnaces use other media such as water and oil. It is attracting attention because it does not require.
• this pulverized coal combustion furnace has the same problems as the use of pulverized coal in blast furnace operation.
• pulverized coal is produced by dry grinding of raw coal, classified, stored in a hopper, discharged, gas is transported in pipes, blown into a metallurgical furnace or combustion furnace from an inlet, metallurgical furnace or combustion Following the process of combustion in the furnace, there are the following problems with the gas transport through the pipes and the discharge of pulverized coal from the tub.
• the amount of pulverized coal injected from the injection port is about 50 to 250 kg / about 1 ton of pig iron, but from a cost perspective, the amount of pulverized coal injected can be increased further. desirable.
• the pulverized coal transportability is not always sufficient, so that a significant improvement in the amount of pulverized coal blown cannot be achieved.
• an object of the present invention is to solve the above-described problems of the conventional method,
• the purpose is to improve coal transportability, remove restrictions on coal types, prevent pipe blockage and prevent shelves from hanging in the hopper, and enable stable pulverized coal injection.
• the present inventors have conducted intensive studies to achieve the above object, and as a result, the transportability of such pulverized coal has been dramatically improved by impregnating inorganic salts soluble in water with pulverized coal having an average HGI of 30 or more in raw coal. found that improved, the present invention c that is, the present invention accomplished the consists soluble inorganic salt in water, the average HGI in the 3 0 or more and metallurgical furnace raw coal or blowing inlet of the combustion furnace And pulverized coal comprising a pulverized coal transport improver characterized by being used for dry pulverized coal in the above-mentioned method, and a pulverized coal comprising the transportability improver and fine pulverized coal.
• the present invention also provides a method of operating a metallurgical furnace or a combustion furnace, into which such a transportability improver and fine pulverized coal are blown.
• the present invention provides a pulverized coal obtained by using an inorganic salt soluble in water as a pulverized coal transport improver, using J3 ⁇ 4 pulverized coal having an average HGI of 30 or more in raw coal, and applying the transportability improver.
• This is a method for improving the transportability of pulverized coal, characterized in that it is dried at the injection port of a metallurgical furnace or a combustion furnace.
• pulverized coal transport improver used for pulverized coal that is composed of water-soluble inorganic salt and has an average HGI of 30 or more in raw coal, and the pulverized coal to which the transportability improver is applied is metallurgy.
• a pulverized coal transport improver characterized by being dried at the inlet of a furnace or combustion furnace. Water is added to the surface of pulverized coal obtained by pulverizing raw coal with an average HGI of 30 or more. Pulverized coal obtained by adhering a soluble inorganic salt to a coal and drying at a blow port of a metallurgical furnace or a combustion furnace.
• pulverized coal obtained by adhering water-soluble inorganic salts to the surface of pulverized coal obtained by pulverizing raw coal with an average HGI of 30 or more is injected into a metallurgical or combustion furnace
• a water-soluble inorganic salt is dried by milling raw coal with an average HGI of 30 or more. It is a pulverized coal transport improver used for pulverized coal that is used for the transport of pulverized coal and is composed of inorganic salts soluble in water and has an average HGI of 30 or more in raw coal, and improves the transportability.
• the present invention also includes a method for transporting pulverized coal, characterized in that the pulverized coal to which the agent has been applied is dried at the injection port of a metallurgical furnace or a combustion furnace.
• a small amount of triboelectric charge of pulverized coal when 0.3 weight (in terms of dry coal) of inorganic salt is added to pulverized coal is (average HG I of raw coal) X 0.00
• the triboelectric charge of pulverized coal is 7 CZg or more and 2.8 CZg or less.
• the inorganic salt is preferably added to the pulverized coal before and / or during pulverization. It is preferable that the pulverized coal is manufactured with a water concentration in the coal at the time of pulverization of 0.5% to 30% by weight or 1.0% to 30% by weight.
• the ratio of particles having a particle size of 106 m or less after pulverization is preferably 10% by weight or more or 40% by weight or more.
• the inorganic salt adheres in an amount of from 0.01 to 10% by weight or from 0,05 to 5% by weight in terms of dry charcoal.
• the amount of decrease in the amount of IS triboelectric charge is not less than (average HG I of raw coal) X 0.007 / CZg.
• the inorganic salt adheres to the coating in an amount of 0.01% by weight or more and 10% by weight or less (in terms of dry charcoal), and the electric charge of the lime belt is 2.8 ⁇ CZg or less.
• the solubility of the inorganic salt is 25 and the solubility is preferably 0.1 or more, 1 or more, or 10 or more.
• water-soluble inorganic salt means that the solubility of inorganic salt at 25 ° C (mass Zg of inorganic salt contained in 100 g of saturated aqueous solution) is 0.1 or more. Indicates an inorganic salt. It preferably represents an inorganic salt in which the solubility of the inorganic salt in 25 is 1 or more, and particularly preferably an inorganic salt in which the solubility of the inorganic salt at 25 ° C is 10 or more. An inorganic salt having a solubility of less than 0.1 is not preferred because the effect corresponding to the amount added is little improved.
• the method for operating a metallurgical furnace or a combustion furnace using the transportability improver of the present invention is as follows: 0.01% by weight or more and 10% by weight or less with respect to pulverized coal blown from an injection port of the metallurgical furnace or the combustion furnace.
• 0.05 to 5% by weight or less of a transportability improver is added to the pulverized coal to reduce the triboelectric charge of the pulverized coal, and the pulverized coal is subjected to a metallurgical furnace or a combustion furnace. It is characterized in that the air is blown from the air inlet.
• the amount added to the pulverized coal is 0.01% by weight or more because of the effect of improving the transportability. Even if the amount exceeds 10% by weight, the effect corresponding to the added amount is not improved. Economically disadvantageous.
• the pulverized coal which is the subject of the present invention is pulverized coal whose average HGI of the raw coal is 30 or more and which is dry at the injection port of a metallurgical furnace or a combustion furnace. It means that the water content by the method of measuring loss on drying in air as defined in JISM 88 12-2 984 is from 0.1% by weight to 10% by weight. Pulverized coal with high moisture content is not suitable as fuel for metallurgical furnace injection or combustion furnace. Such pulverized coal having an average HGI of 30 or more has poor transportability, but by using the transportability improver of the present invention, smooth transport of such pulverized coal has become possible. Furthermore, the present invention is also effective for pulverized coal having an average HGI 50 or more of raw coal, which is considered to be extremely difficult to transport gas with current technology.
• the present invention uses a water-soluble inorganic salt as a pulverized coal transport improver, uses pulverized coal having an average HGI of 30 or more in raw coal, and to which the transport improver is applied.
• the present invention provides a method for improving pulverized coal transportability, characterized in that the pulverized coal is dried at an injection port of a metallurgical furnace or a combustion furnace.
• the present invention also provides use of a water-soluble inorganic salt for transporting dry pulverized coal obtained by pulverizing raw coal having an average HGI of 30 or more.
• HG I is an abbreviation for "Hardgrove Grinding Index” (crushing ability index), which is an index that indicates the grinding resistance of coal as defined by ASTM D409.
• the present inventors have clarified that the above-mentioned problem of pulverized coal is caused by electrification between pulverized coals, and to solve the above-mentioned problem by reducing the triboelectric charge amount of pulverized coal. It was also found that the magnitude of the triboelectric charge between the pulverized coals strongly correlated with the fluidity index of the pulverized coal itself and the pipe transport characteristics.
• coal with poor transportability has more fine coal adhering around pulverized coal with a size of about average particle diameter
• pulverized coal with good transportability has almost more fine coal adhering around. Absent. These finer coals adhere strongly to regular pulverized coal,
• the triboelectric charge can be reduced to 2.8 fifty by adding a transportability improver.
• the transferability was improved by setting the CZ to less than g.
• the triboelectric charge amount refers to a value determined by a method described in detail in Examples described later.
• the fluidity index indicates the discharge characteristics of the hopper, etc.
• the pressure loss indicates the flow characteristics of the pipe during gas transport. Can be removed.
• As a guideline for improving the transportability it is necessary to improve the fluidity index by 3 points or more and to reduce the pressure loss by 3 minH 2 OZm or more.
• the fluidity index is 40 or more and the pressure loss is 16 mmH 2 ⁇ Zm or less.
• a water-soluble inorganic salt is suitable as a compound that reduces the triboelectric charge of such pulverized coal and improves the transportability of the pulverized coal.
• Examples of the water-soluble inorganic salt used in the present invention include an inorganic salt represented by the following general formula: MaXb ⁇ cH 20 .
• M Ag, A l, Ba, B e, Ca, Cd, Co, C r, C s, Cu, F e, H, Hg, K, L i, Mg, Mn, Na NH 4, It is selected from Ni, Pb, Sn, Sr, and Zn.
• X is A 1 (S ⁇ 4 ) 2 , A1F S , B,. ⁇ 16, B 2 0 5, B 3 F S, B 4 0 7, BB s ⁇ 10, B e F 4, BF 4, B0 2, B0 3, B r, B R_ ⁇ , B r 0 3,
• Selected from SO 4 a, b is a ⁇ determined by M, the valence of X, also these compounds c may be a hydrate of one or more integer .
• Specific examples of the water-soluble inorganic salt used in the present invention include the following.
• F e B r 2. F e C l 2, F e C l 2, F e (C L_ ⁇ 4) 2. F e (C 10 4) 3. F e ( N_ ⁇ 3) 2, F e (N ⁇ 3 ) 3 , F eS ⁇ 4 , F e S i FF e F 3
• Mn B r 2 Mn C 1 2, Mn (N0 3) 2, Mn SO "M n (C 1 4) 2 M n F 2, Mn (I 3) 2,
• Na 4 F e " NaH 2 P 4, N a IN a Mn Na 2 Mo0 4, NaNO 2, N a NO3 N a OH, Na 2 PH0 3 N a 2 S 0 3, N a 2 S 2 0 3, n a S 2 0 5 n a S O3NH2, n a 2 S n H)
• Na 2 S 2 0 "Na 2 S 3 0s Na 2 S 4 Na 2 S 5 O s Na 2 S i F 6 .Na 2 SO 4, Na 2 B 4 07 Na 2 B, 0 O ] 6 , Na FN a HC 0 3 N a 2 HPO 4, N a 2 H 2 P 2 0 6 N a 2 ⁇ 2 ⁇ 2 0 ⁇ , Na 3 HP 2 s, Na 3 HP 2 7, N a I 0 3 N a I 4 Na 2 Mo 3 lfl Na 3 P 4, Na 4 P 2 6, Na 3 P 4, Na P 2 7 Na 4 P 2 7, Na 5 P 3 O 10, Na 2 S0 4, Na 2 S 2 6 , Na 2 S i F 6
• N i B r 2 N i C 1 2, N i (C 1 3) 2, N i (C 1 4) 2, N i I 2, N i (N 3) 2, N i SO "NM F 2 , N i CI 0 3 ) 2
• Mg B r 2, Mg (B R_ ⁇ 3) 2, Mg C 1 2 , Mg (C ] - For 3) 2, Mg (CI 0 4) 2, Mg C r 0 4, Mg C r 2 0 Ma, Mg I 2 , Mg (N0 2 ) 2 , Mg (N ⁇ 3 ) 2 ,
• Mg S_ ⁇ 4 Mg S 2 0 3, MgMo O "Mg S 2 ⁇ 6, Mg (S 0 3 NH 2) 2 Mg S i F 6, M n B r 2, M n C 1 2, Mn (N0 3) 2, Mn S 0 4 ,
• a solvent it is or at an appropriate concentration, and to use them in a liquid form for uniform dispersion.
• concentration of 1% by weight or more is more convenient for drying the solvent.
• the solvent is preferably water for drying.
• the amount of reduction in the triboelectric charge of the pulverized coal when 0.3% by weight (in terms of dry coal) is added to the pulverized coal is as follows. HG]) X 0.000 7 ⁇ CZg or more, or 0.3% by weight (calculated as dry coal) based on the pulverized coal, the triboelectric charge of the pulverized coal is 2.8 uC / g or less is preferable, and those satisfying both are more preferable.
• the transportability improver of the present invention exerts the same effect when added at any time before, during, after, or after pulverizing raw coal into pulverized coal, but before pulverization. Or it is preferable to add Z and during the grinding.
• the transportability improver of the present invention is added before and / or during pulverization, the water concentration in the right coal at the time of pulverization should be 0.5% by weight or more and 30% by weight or less and the fine powder after pulverization.
• the effect is exhibited when the ratio of particles of 106 // m or less of coal is 0% by weight or more.
• the moisture concentration in the coal during pulverization is 1.0% by weight or more and 30% by weight or It is preferable that the ratio of particles having a particle size of 106 m or less in the pulverized coal after the pulverization is 40% by weight or more.
• the moisture concentration in the coal during pulverization is preferably 0.5% by weight or more from the viewpoint of improving transportability, and 30% by weight. Even if it exceeds, there is no problem from the improvement effect, but the pulverized coal to which the transportability improver of the present invention is added is used after being dried, so that when the water concentration is high, the load is imposed on the drying, which is economically disadvantageous.
• the ratio of particles of 106 m or less in the pulverized coal is 10% by weight or more. Compared with pulverized coal, it has higher transportability, so the effect obtained by adding the transportability improver of the present invention is smaller.
• the metallurgical furnaces and combustion furnaces that are the subject of the present invention include furnaces that use pulverized coal as fuel and fuel or as a reducing agent (blast furnace, cuvola, single-tally kiln, smelting reduction furnace, cold iron source melting furnace, boiler, etc.) And carbonization equipment using pulverized coal (eg, fluidized bed carbonization furnace, gas reforming furnace, etc.).
• the transportability of pulverized coal having an average HGI of 30 or more of raw coal is improved by reducing the amount of finely charged pulverized coal, and mass transport of such pulverized coal can be achieved.
• the transportability improving agent of the present invention to coal having poor transportability, the transportability can be improved and a large amount of the coal can be transported, so that the types of coal that can be used for pulverized coal injection can be expanded.
• FIG. 1 is a schematic diagram of an apparatus used for measuring a J triboelectric charge amount.
• FIG. 2 is a schematic diagram of an apparatus used for measuring pipe transport characteristics.
• FIG. 3 is a schematic diagram of an actual machine blast furnace pulverized coal injection device used in Example 32.
• FIG. 4 is a chart showing the result of the transfer time in Example 324.
• FIG. 5 is a chart showing the results of piping pressure loss in Example 32.
• FIG. 6 is a chart showing the results of piping pressure loss in Example 32.
• FIG. 7 is a schematic diagram of the pulverized coal-fired boiler used in Example 325.
• FIG. 8 is a chart showing the results of piping pressure loss in Example 325.
• Figure 9 is a chart showing the relationship between the average HGI of raw coal and the amount of triboelectric charging when various transportability improvers are used.
• the crusher used at this time was a small crusher SCM-40A (made by Ishizaki Electric).
• the crusher used at this time was a small crusher SCM-40A (made by Ishizaki Electric).
• the ratio of particles of 106 or less in the pulverized coal after pulverization is defined by the following equation.
• the sieve is an industrial sieve with a mesh size of 106 m and wire-75 m diameter as defined by JISZ 8801 (manufactured by Iida Kogyo Co., Ltd.)
• JISZ 8801 manufactured by Iida Kogyo Co., Ltd.
• a micro-type electromagnetic vibrating sieve M-2 manufactured by Tsutsui Rikakiki Co., Ltd. was used with a vibration intensity of 8 (vibration adjustment scale) and a vibration time of 2 hours.
• the table also shows how much the fluidity index, pipe transport characteristics, and triboelectric charge increased or decreased compared to the comparative example in which the transportability improver was not added. In other words, based on each comparative example, it was shown how much the fluidity index was improved by adding a transportability improver, the pipe power loss, and the triboelectric charge amount was reduced. .
• the amount of triboelectric charge of the pulverized pulverized coal is measured with a blow-off measuring device as shown in Fig. 1.
• Fig. 1 1 is a compressed gas
• 2 is a nozzle
• 3 is a Faraday gage
• 4 is a mesh with an opening of 38 m
• 5 is a dust hole
• 6 is an electrometer.
• blow-off devices usually determine the amount of / E frictional charge for interrogating foreign objects with a difference (For example, toner and carrier) Force ⁇
• a mesh having an aperture of 38 / m is used for the mesh, and the mesh is placed on top of the mesh.
• pulverized coal ⁇ 0.3 g of pulverized coal is loaded, compressed gas (for example, air) is blown at a pressure of 0.6 kgfZcin 2 and pulverized coal of 38 m or less is blown to the dust hole and removed to obtain the following pulverized coal. Measure the amount of charge.
• compressed gas for example, air
• the fluidity index is an index for evaluating the fluidity of a powder.
• the four factors (repose angle, compression degree, spatula angle, cohesion degree) of the powder are indexed and calculated from the sum of the respective indices. Things. Details of the determination method and index of each factor are described in “Powder Engineering Handbook” (edited by the Society of Powder Engineering, published by Nikkan Kogyo, 1987), pp. 151-152. The method for determining each factor is described below.
• Angle of repose Pass the powder through a standard sieve (25 mesh), pour it through a funnel onto a disk with a diameter of 8 mm, and measure the inclination angle of the formed sedimentary layer.
• Spatula angle Insert a spatula (spatula) of a certain width (22 mm) into the deposited powder, lift it and measure the inclination angle of the powder placed on it. Next, a slight impact is applied to the spatula, this angle is measured again, and the average of these two values is defined as the spatula angle.
• Fig. 2 7 is pulverized coal
• 8 is a table feeder
• 9 is a flow meter
• 10 is a horizontal pipe with a diameter of 12.7
• 11 is a cyclone.
• the apparatus pulverized coal 7 discharged Ri good powder feeder 8
• a pressure ⁇ holes (, P, P 2) and the gas Waoku by the transport gas is to measure the pressure loss between.
• the experimental conditions were as follows.
• Pressure gauge P is performed sampled data at 500Hz in P 2. Pressure loss is given as the overall average of —P 2 during the transport time (6 minutes).
• Table 1 (Table 1 also shows the results) to Table 25 show the types of pulverized coal and it as a transportability improver.
• Comparative example 15 55 95 None ⁇ ⁇ 5.0 12 8 15 35 1 22.1 3.15 Male ash C char 55 95 Reforming power (CaC) 0.3 before 0.5 U 9 15 38 3 18.5 3.6 2.55 0.60Expansion C ⁇ 55 95 Chloride Calcium (CaCI :) 0.3 Before dressing 1.0 15 11 15 41 6 15.8 6.3 2.32 0.83
• Example 110 e char 96 95 CaSiF s 0.3 m 5.0 17 12 17 46 12 g 2 If) sn in tt Example ill e char 90 95 Cr (Cl (L) 2 0.3 before 5.0 17 12 17 46 12 8.8 20.2 0.18 4.09 Difficult 2e charcoal 96 95 Cr (N0 3 ), 0.3 ⁇ 5.0 17 12 17 46 12 9.2 19.8 0.18 4.09 Plunging ⁇ 113 e3 ⁇ 4 96 95 CrCI 3 0.3 Before crushing 5.0 17 12 17 46 12 8.8 20.2 0.15 19 miu e Ash 96 95 CuBrj 0.3 before 5.0 17 12 17 46 12 8.8 20.2 0.16 4.11 Eiji e-coal 96 95 CrCl!
• 106 m or less (%) j indicates the ratio (weight) of particles having a particle size of 10617 or less in pulverized coal after pulverization.
• the “reduction amount” is a numerical value in comparison with the result of the corresponding pulverized coal without the addition of the transportability improver of the comparative example.
• Pulverized coal injection volume 40 t / Hr
• Conveyance improver ammonium sulfate
• Pulverized coal 95% of particles less than 106 / m
• FIG. 3 is a schematic view of the blast furnace pulverized coal injection device used in this example.
• 12 is a blast furnace
• 13 is an inlet
• 14 is an injection pipe
• 15 is a distribution tank
• 16 is a valve
• 17 is a pressure equalizing tank
• 18 is a valve
• 19 is a pulverized coal storage tank
• 20 is a coal crusher
• 21 is an additive spray nozzle
• 22 is a coal conveyor belt conveyor
• 23 is a coal receiving hopper
• 24 is an air-nitrogen compressor.
• the coal is put into a receiving hopper 23 and supplied to a crusher 20 by a conveyor 22. On the way, a transportability improver is spray-added from the nozzle 21.
• Crusher 20 The coal is pulverized into pulverized coal having the above particle size and sent to storage tank 19. First, the valve 18 is opened while the internal pressure of the equalizing tank 17 is equal to the atmospheric pressure, and a specified amount of pulverized coal is supplied from the storage tank 19 to the equalizing tank 17. Next, the internal pressure of the pressure equalizing tank 17 is increased until the internal pressure of the distribution tank 15 becomes the same. With the internal pressures of tanks 15 and 17 equal, valve 16 opens and pulverized coal falls by gravity. The pulverized coal is gas-transported from the distribution tank 15 to the injection port 13 through the injection pipe 14 by the air supplied from the compressor 24, and is blown into the blast furnace 12 from the injection port 13.
• Figs. 4 and 5 (a) means the case where the transportability improver was not added, (port) means the case where the transportability enhancer was added, and in Fig. 6, A means the upper limit value of the equipment.
• FIGS. 4 and 5 are relative evaluations in which the case where no transportability improver is added is set to 1.
• Figure 6 shows the change in pipe pressure loss when the average HGI of raw coal was changed to 45, 55, and 70.
• the addition of a transportability improver reduces the pipe pressure loss even when using high HGI coal, making it possible to expand the type of coal used and to use inexpensive coal.
• Fig. 6 shows a relative evaluation where the case where the transportability improver is not added to pulverized coal having an average HGI of 45 is set to 1.
• Conveyance improver ammonium sulfate
• Pulverized coal Percentage of particles below 106 is 95%
• FIG. 7 shows a schematic diagram of the pulverized coal-fired boiler used in this example.
• 25 is a boiler combustion chamber
• 26 is a burner
• 27 is a blowing pipe
• 28 is a pulverized coal storage tank
• 29 is a coal crusher
• 30 is an additive injection nozzle
• 31 is a coal conveyor belt conveyor
• 32 is coal Receiving hobba
• 33 means air-nitrogen compressor.
• the coal is fed into the receiving hopper 33 and supplied to the mill 29 by the conveyor 31. On the way, a transportability improver is injected from the nozzle 30.
• the coal is pulverized into pulverized coal having the above-mentioned 9 grain sizes by the pulverizer 29 and sent to the storage tank 28.
• the air is conveyed by the blown air supplied from the compressor 33 and supplied to the burner 26 for combustion.

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• 1996
  • 1996-03-25 JP JP8068513A patent/JPH09256015A/ja active Pending
• 1997
  • 1997-03-05 KR KR1019980707612A patent/KR20000004999A/ko not_active Withdrawn
  • 1997-03-05 US US09/155,296 patent/US6083289A/en not_active Expired - Fee Related
  • 1997-03-05 WO PCT/JP1997/000668 patent/WO1997036009A1/ja not_active Application Discontinuation
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