Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
  • C10B57/10—Drying
• • 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
  • F23K1/04—Heating fuel prior to delivery to combustion apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
  • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B3/00—Drying solid materials or objects by processes involving the application of heat
  • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
  • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
  • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Definitions

• the present invention relates to a method and apparatus for drying a wet raw material such as coal charged in a coke oven with a fluidized bed dryer.
• Patent Document 1 discloses that flue exhaust gas from a coke oven is introduced into a fluidized bed dryer as a heat source and fluidized gas. A method for drying coal is disclosed.
• Patent Document 2 when exhaust gas is introduced into a fluidized bed dryer as a heat source and fluidized gas to dry a wet raw material, condensation occurs near the gas outlet of the fluidized bed dryer and downstream thereof.
• a method of introducing a part of the exhaust gas introduced into the lower part of the fluidized bed dryer near the gas outlet of the fluidized bed dryer is disclosed.
• the wet raw material is charged into the fluidized bed dryer using a charging chute.
• wet raw material adheres to and accumulates at the side edges (corners), causing a charging failure.
• the moisture content of the wet raw material is high, such as in rainy weather, adhesion / deposition to the charging shell is remarkable.
• the temperature dropped significantly in cold regions the wet material that was deposited on the charging chute was frozen, exacerbating the charging failure.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2001-55582
• Patent Document 2 Japanese Patent No. 2807813
• the problem to be solved by the present invention is that the wet raw material adheres to and accumulates on the charging chute of the fluidized bed dryer in the method and apparatus for drying the wet raw material by the fluidized bed dryer. It is to be able to prevent with a cost and simple structure.
• the wet raw material drying method of the present invention is a wet raw material drying method for drying a wet raw material such as coal introduced into a fluidized bed dryer as a heat source and fluidizing gas into a fluidized bed dryer.
• a part of the high-temperature gas is blown into the charging chute for charging the wet raw material into the fluidized bed dryer.
• the wet raw material drying apparatus of the present invention is a wet raw material that dries a wet raw material such as coal introduced into a fluidized bed dryer as a heat source and fluidized gas into a fluidized bed dryer.
• a blowing nozzle for blowing a part of the high-temperature gas toward the inside of a charging chute for charging the wet raw material into the fluidized bed dryer is provided.
• a part of the high-temperature gas can be blown toward the side end portion inside the charging chute.
• a part of the high-temperature gas can be blown from the upstream side of the charging chute into the charging chute.
• a part of the high-temperature gas is blown into the charging chute and also introduced into the vicinity of the gas outlet of the fluidized bed dryer, so that the gas temperature in the vicinity of the gas outlet of the fluidized bed dryer becomes the dew point or higher.
• the amount of hot gas blown into the charging chute and the amount of hot gas introduced near the gas outlet of the fluidized bed dryer can be controlled.
• the present invention since a part of the high-temperature gas used as the heat source and fluidizing gas of the fluidized bed dryer is blown into the charging chute, it has conventionally been installed to prevent the attachment of wet raw materials. There is no need for an indirect heating type heating device using a heat medium such as steam. Therefore, the configuration of the apparatus becomes simple and the cost can be reduced. [0015] Further, the present invention is a direct heating method in which a part of the high-temperature gas is blown into the charging chute, so that the wet raw material adheres and accumulates in the charging chute compared to the conventional indirect heating method. It can be surely prevented. It can also prevent freezing of wet raw materials in cold regions.
• FIG. 1 is a schematic configuration diagram showing a first embodiment of the drying apparatus of the present invention.
• FIG. 2A is a front view showing a configuration example in which high temperature gas is blown into the charging chute.
• FIG. 2B is an AA arrow view of FIG. 2A.
• FIG. 3A is a perspective view showing an arrangement example of blowing nozzles for blowing hot gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 3B is a front view showing an arrangement example of blowing nozzles for blowing high-temperature gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 3C is a side view showing an arrangement example of blowing nozzles for blowing high-temperature gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 4A is a perspective view showing an arrangement example of blowing nozzles for blowing high-temperature gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 4B is a front view showing an arrangement example of blowing nozzles for blowing high-temperature gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 4C is a side view showing an arrangement example of blowing nozzles for blowing high-temperature gas into the charging chute in the configuration of FIGS. 2A and 2B.
• FIG. 5A is a front view showing another configuration example in which high-temperature gas is blown into the charging chute.
• FIG. 5B is a BB arrow view of FIG. 5A.
• FIG. 6B is a side view showing an arrangement example of blowing nozzles for blowing hot gas into the charging chute in the configurations of FIGS. 5A and 5B.
• FIG. 8 is a schematic configuration diagram showing a third embodiment of the drying apparatus of the present invention.
• coal powder for coke ovens
• FIG. 1 is a schematic configuration diagram showing a first embodiment of the drying apparatus of the present invention.
• combustion exhaust gas (hereinafter referred to as “hot gas”) generated in a coke oven (not shown) at a temperature of about 150 to 250 ° C. is boosted by a push-in fan 1 and gas main pipe 2 and It is introduced from the lower part of the fluidized bed dryer 4 through the flow rate control valve 3 and discharged from the upper gas outlet 5.
• Coal powder as a wet raw material is charged into the fluidized bed dryer 4 by the charging chute 6, and the fluidized bed 7 is formed by the upward flow of the above-described high-temperature gas introduced from the lower part of the fluidized bed dryer 4. To do. In the fluidized bed 7, the coal powder is dried, and the coal powder is adjusted to a predetermined temperature and moisture content and discharged by the discharge chute 8.
• a first bypass pipe 9 branches from the gas main pipe 2, and a part of the high-temperature gas is introduced into the vicinity of the gas outlet 5 in the upper part of the fluidized bed dryer 4 through the first bypass pipe 9.
• a method of providing a flow control valve or an orifice in the middle of the second bypass pipe 11 A method of providing a flow control valve and an orifice on the downstream side of the branch of the binos pipe 9 with the second bypass pipe 11 and both of them can be considered.
• Fluidized bed dryer 4 The gas discharged from the upper gas outlet 5 is attracted by the induction fan 14. The gas flows through the gas discharge pipe 12 and is removed by a dust collector 13 such as a bag filter and then discharged to the atmosphere.
• a dust collector 13 such as a bag filter
• a heating device may be provided upstream of the branching portion of the first bypass pipe 9 of the gas main pipe 2 to heat the gas.
• FIG. 2A is a front view showing a configuration example in which high-temperature gas is blown into the charging chute
• FIG. 2B is a view taken along the line AA in FIG. 2A
• FIGS. 3A to 3C and FIGS. 4A to 4C show arrangement examples of blowing nozzles for blowing hot gas into the charging chute in the configurations of FIGS. 2A and 2B, respectively.
• FIGS. 2A and 2B high-temperature gas is blown toward the side end (corner) inside the charging chute 6 where coal powder easily adheres.
• a plurality of blowing nozzles 15 are provided on the sliding surface 6a and the side surface 6b of the charging chute 6, and the blowing direction of the blowing nozzles 15 is determined. Rub it toward the side edge 6c of the charging chute 6.
• the angles ⁇ 1 and ⁇ 2 shown in FIGS. 4B and 4C the adhesion of coal powder to the side end portion 6c of the charging chute 6 can be reliably prevented.
• the position of the blowing nozzle 15 is preferably as small as possible in L1 and L2 shown in FIGS. 3B and 3C.
• the blowing nozzle 15 arranged on the sliding surface 6a of the charging chute 6 must be angled so that the coal powder falling on the charging chute 6 does not block the nozzle opening. It is preferable to set the angle of the blowing nozzle 15 so that 90 °-(0 c + ⁇ ⁇ ) is larger than the repose angle of the coal powder at 4C.
• the temperature of the hot gas blown into the charging chute 6 is preferably higher than the atmospheric temperature. Yes. Also, considering the heat resistance of the charging chute 6 that is generally made of plain steel, it is preferable that the temperature of the hot gas blown is 350 ° C or less. The lower the humidity of the hot gas blown, the better.
• FIG. 5A is a front view showing another configuration example in which high temperature gas is blown into the charging chute
• FIG. 5B is a view taken along the line BB in FIG. 5A
• 6A and 6B show an arrangement example of the blowing nozzles for blowing the high-temperature gas into the charging chute in the configuration shown in FIGS. 5A and 5B.
• FIGS. 5A and 5B hot gas is blown from the charging device 16 upstream of the charging chute 6 into the charging chute 6, and the entire charging chute 6 is heated and dried. It is designed to make it happen.
• a blowing nozzle 15 is arranged in the charging device 16 and hot gas is blown into the charging chute 6.
• the angle ⁇ p of the blowing nozzle 15 in FIG. 6B is 0 ° to ⁇ c so that the coal powder charged into the fluidized bed through the charging chute 6 can be smoothly dropped. It is preferable to be between.
• the position of the lower end surface N of the blowing nozzle 15 opposite to the fluidized bed is located inward of the charging chute 6 (fluidized bed side) from the position of the upper end surface C of the sliding surface 6a of the charging chute 6. It is preferable to be located.
• FIG. 7 is a schematic configuration diagram showing a second embodiment of the drying apparatus of the present invention.
• the same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
• the hot gas pressurized by the pushing fan 1 can be blown into the charging chute 6 simply by connecting the second bypass pipe 11 to the gas main pipe 2.
• the flow rates of the flow control valve 10 and the second bypass pipe 11 of the first bypass pipe 9 are as follows.
• a control device 18 is connected to the control valve 17 so that the high-temperature gas flow rate in the first bypass pipe 9 and the second bypass pipe 11 can be detected and adjusted.
• the total amount of high-temperature gas that does not pass through the fluidized bed 7 is adjusted so that the gas temperature in the vicinity of the gas outlet 5 becomes the dew point or higher.
• hot gas is introduced from the second bypass pipe 11 in this way, conventionally, hot gas is introduced near the gas outlet 5 by one gas pipe (first bypass pipe 9). Compared to, the diameter of the gas pipe can be reduced or the gas pipe can be deleted.
• FIG. 8 is a schematic configuration diagram showing a third embodiment of the drying apparatus of the present invention.
• the same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
• a dry gas such as instrument air is blown into the charging chute 6 in addition to or in place of the high temperature gas.
• instrument air it is not efficient considering the low temperature and running cost of instrument air.
• blowing in a gas containing a large amount of oxygen increases the oxygen concentration in the fluidized bed dryer 4, so in order to prevent dust explosion, etc. It is necessary to adjust the blowing rate so that the oxygen concentration falls within a safe range.
• the present invention can be applied not only to drying coal powder charged into a coke oven, but also to drying other wet raw materials such as granulated slag and limestone.
• the high-temperature gas to be used is not limited to the combustion exhaust gas from the coke oven, but power exhaust gas such as a combustion furnace or kiln can also be used.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Microbiology (AREA)
• Combustion & Propulsion (AREA)
• Drying Of Solid Materials (AREA)
• Coke Industry (AREA)
• Materials Engineering (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36927290

Family Applications (1)

Country Status (8)

Families Citing this family (11)

Citations (3)

• 2005
  • 2005-02-22 JP JP2005045977A patent/JP4681319B2/ja active Active
• 2006
  • 2006-02-17 RU RU2007135214/15A patent/RU2366686C2/ru not_active IP Right Cessation
  • 2006-02-17 KR KR1020077021713A patent/KR100960429B1/ko active IP Right Grant
  • 2006-02-17 WO PCT/JP2006/302858 patent/WO2006090649A1/ja active Application Filing
  • 2006-02-17 UA UAA200710499A patent/UA86872C2/ru unknown
  • 2006-02-17 CN CN200680005761.XA patent/CN101128568B/zh not_active Expired - Fee Related
  • 2006-02-17 BR BRPI0606866-9A patent/BRPI0606866A2/pt not_active Application Discontinuation
  • 2006-02-21 TW TW95105753A patent/TWI279512B/zh active

Patent Citations (3)

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