WO2011002187A2 - Procédé et appareil pour valoriser du charbon de rang bas - Google Patents

Procédé et appareil pour valoriser du charbon de rang bas Download PDF

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WO2011002187A2
WO2011002187A2 PCT/KR2010/004177 KR2010004177W WO2011002187A2 WO 2011002187 A2 WO2011002187 A2 WO 2011002187A2 KR 2010004177 W KR2010004177 W KR 2010004177W WO 2011002187 A2 WO2011002187 A2 WO 2011002187A2
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Prior art keywords
coal
heavy oil
powder
ash powder
oil ash
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PCT/KR2010/004177
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English (en)
Korean (ko)
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WO2011002187A3 (fr
WO2011002187A9 (fr
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김재관
이현동
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한국전력공사
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Publication of WO2011002187A2 publication Critical patent/WO2011002187A2/fr
Publication of WO2011002187A3 publication Critical patent/WO2011002187A3/fr
Publication of WO2011002187A9 publication Critical patent/WO2011002187A9/fr

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    • 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
    • F26B3/092—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 agitating the fluidised bed, e.g. by vibrating or pulsating
    • F26B3/0923—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 agitating the fluidised bed, e.g. by vibrating or pulsating by mechanical means, e.g. vibrated plate, stirrer
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • 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
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • 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
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives
    • 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
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy

Definitions

  • low-grade coal having a moisture content of 30% or more is converted into high-grade coal with a heat generation capacity of 6,500 kcal / kg or more and less than 10% moisture, thereby preventing spontaneous ignition of high-grade coal.
  • the present invention relates to a method and apparatus for high quality coal production.
  • Coal is generally divided into peat, brown coal, lignite, sub-bituminous coal, bituminous coal and anthracite grades.
  • Heavy or high voluminous bituminous coal, and anthracite is divided into semi-anthracite, anthracite, meta-anthracite and graphite anthracite.
  • Low rank coal refers to brown coal, lignite sub-bituminous coal, and bituminous coal and anthracite are classified as high rank coal (HRC).
  • High and high here do not mean the quality of coal, just the difference in carbonization.
  • high water high ash lignite low grade
  • HRC High Rank Coal
  • the moisture of lower coal is divided into free water, interstitial water (pore water), surface water, bound water, and the like.
  • a large part of the lower coal water is the free water adhering to the lower coal surface, the water present between the molecules of the lower coal and the inner water, and the bound water is chemically bonded to the lower coal molecules.
  • the free and surface waters are dried at 100 ⁇ 5 ° C., but the internal and bonded waters are destroyed and dried at about 400 ° C.
  • an object of the present invention is to classify low-grade coal having a water content of 30% or more into a coal for power generation of 6,500 kcal / kg or more of water having a moisture content of 10% or less, and a high-grade method of low-grade coal capable of preventing spontaneous ignition of high-grade coal. To provide a device.
  • the primary coal is dried by injecting heated air of 100 ⁇ 130 °C to low-grade coal having a particle size of 10 ⁇ 30mm and a water content of 30% or more, here the heavy oil ash having a particle size of 74 ⁇ m or less 5 to 20 parts by weight of the powder is added to 100 parts by weight of the lower coal, and then mixed, and then microwave is used as a heat source to provide a high quality method for lower coal, characterized in that the secondary drying at 120 ⁇ 150 °C.
  • the lower coal storage tank for storing the lower coal
  • the lower coal supply unit including a lower coal rotary feeder and a diaphragm for transporting the lower coal stored in the lower portion
  • Heavy oil ash powder storage tank in which heavy oil ash powder is stored, heavy oil ash powder mill for pulverizing the heavy oil ash powder to a particle size of 74 ⁇ m or less, heavy oil ash powder storage tank for storing the finely divided heavy oil ash powder, and scattering in the storage tank
  • a heavy oil ash powder supply unit including a heavy oil ash powder bag filter for collecting the powder, and a rotary valve for transporting the heavy oil ash powder to a lower portion, and a heavy oil ash powder supply screw;
  • a heat-air supply unit comprising a blower, a heat exchanger for recovering heat of dried and stabilized high-quality coal, and a heater for heating the heat-exchanged air with drying air;
  • Lower coal inlet through which the coal transported through the lower coal supply unit is input, heavy oil ash powder
  • a porous plate having a hot air inlet and an air inlet on one side for firstly drying the lower coal through the lower coal introduced through the lower coal inlet, and the first dried lower coal and heavy oil ash.
  • Lower coal stabilization apparatus for secondary drying at 120 ⁇ 150 °C by mixing the powder as a microwave as a heat source, steam suction unit for sucking the steam decomposed during the drying process of the lower coal, for discharging the dried and stabilized coal
  • a lower coal drying and stabilizing unit including a discharge unit; And a high quality coal storage unit comprising a rotary feeder of high quality coal transported through the high quality coal outlet and a high quality coal storage tank for storing the transferred high quality coal. to provide.
  • the lower coal stabilization device is a wave-type vibration flow plate for uniform mixing of the primary dried lower coal and heavy oil ash powder introduced from the heavy oil ash powder inlet, and the lower coal and heavy oil And a microwave feeder for microwave drying the mixture of ash powder and a temperature sensor for measuring the temperature inside the mixture of the lower coal and heavy oil ash powder.
  • the low-grade coal high-quality device a vapor phase powder recovery device for collecting the powder in the dry steam sucked by the steam suction unit attached to the upper portion of the low coal stabilizer, heavy oil ash powder for recycling the recovered powder
  • a recirculation blower a powder suction pump for sucking dry steam after the powder collection
  • a condenser for condensing the inhaled vapor phase air
  • a gas-liquid separator separating gas from the condensed condensate
  • a condensate storage tank for storing condensate from the gas-liquid separator It may further comprise a decomposition gas phase powder recovery unit comprising a circulating pump for sending the condensed water to the cooling water.
  • the low-grade coal high-quality device may further comprise an accessory facility consisting of a vibration fluidizer lower spring, a vibration supply device, a vibration fluid supporter.
  • the vibration fluid plate is preferably made of a material having a low permittivity (Permittivity) that can transmit the supplied microwave.
  • the above-described high-grade coal production method and apparatus for low-grade coal according to the present invention can high-grade low-grade coal with water content of 30% or more by using microwave drying and heavy ash powder with high-grade heat of 6,500 kcal / kg or more of heat generation capacity of 6,500 kcal / kg or more. In addition, it has a useful effect to prevent spontaneous ignition of high-grade coal.
  • FIG. 1 is a system diagram of a high quality coalescing apparatus of lower coal according to the present invention.
  • FIG. 2 is an enlarged view illustrating main parts of FIG. 1.
  • FIG. 3 is an enlarged view of the porous plate illustrated in FIG. 1.
  • FIG. 4 is a cross-sectional view taken along the line A-A of FIG.
  • FIG. 5 is an enlarged cross-sectional view of the vibrating fluid plate shown in FIG.
  • 6 is a graph showing the results of the pyrophoric test.
  • the high-grade method of lower coal according to the present invention is first dried by injecting 100 to 130 ° C. heating air into lower coal having a particle size of 10 to 30 mm and a water content of 30% or more, and having a particle size of 74 ⁇ m or less. 5 to 20 parts by weight of heavy oil ash powder is added to 100 parts by weight of the lower coal and mixed, followed by secondary drying at 120 to 150 ° C. using microwave as a heat source.
  • the particle size of the lower coal need not necessarily be limited, but lower coal having a particle size of 10 to 30 mm is used so that drying can be performed smoothly. If necessary, it may be ground before drying to have the above-described particle size.
  • Low-grade coal is subjected to the primary drying to heat the low-grade coal to 100 ⁇ 130 °C to remove free water and surface water adhering to the surface.
  • the above-mentioned primary drying is generally performed in the art, and in the present invention, the primary drying is performed by injecting heated air.
  • microwaves are used as the heat source, and the second drying is performed by mixing a hydrophobic heavy oil powder having a high affinity with a carbon component and a high affinity with the binding water. That is, 5 to 20 parts by weight of heavy oil ash powder having a particle size of 74 ⁇ m or less is added to 100 parts by weight of the lower coal and mixed with the first dried lower coal, followed by secondary drying at 120 to 150 ° C. using microwave as a heat source. will be.
  • the particle size of the heavy oil ash powder does not necessarily need to be limited, it is preferable to use a particle size of 74 ⁇ m or less for effective drying. In addition, considering the scattering in the work process, it is better to use a particle size of 0.01 ⁇ m or more.
  • the heavy oil ash powder is used 5 to 20 parts by weight based on 100 parts by weight of the lower coal, if the heavy oil ash powder is less than 5 parts by weight based on the above, there is a disadvantage that the temperature for secondary drying is increased and the drying time is long. When the heavy oil ash powder exceeds 20 parts by weight, the calorie of coal obtained may be reduced.
  • the present invention is a heavy oil-fired power plant that is similar in composition to coal, not a method of applying a microwave heat source to a heat source application technology such as a heating furnace and an electric furnace, but adding an oil component such as heavy oil when moisture is dried. It is a technology to increase the drying speed through the hydrophobic action with bound water by adding heavy oil ash fine powder, a by-product of combustion, and to prevent spontaneous ignition by adsorption.
  • Microwave is a kind of electromagnetic wave (300MHz ⁇ 300GHz) located between spectral far infrared and radio wave (high frequency).
  • the biggest feature of microwave is that the heating method uses friction force by molecular rotation or rearrangement as much as speed corresponding to the frequency of electromagnetic wave, so that it can raise the temperature faster than conventional thermal conductive heating.
  • microwave energy has low energy that does not damage chemical bonds, and thus does not alter or destroy molecular structure. Because of the rapid temperature rise and chemical stability, microwave technology has already been applied in various chemical fields.
  • microwaves the principle of microwaves is that the material with low dielectric constant (permeability) transmits microwaves, while internal moisture (gap water, bound water) such as polar solvent with high transmittance absorbs microwaves and thus maintains its own molecular rotation. Evaporate while releasing heat through.
  • heavy oil ash powder can be easily obtained as a combustion by-product of a heavy oil-fired power plant.
  • Korea Western Power Co., Ltd.'s Pyeongtaek Thermal Power Plant No. 1 generates 3,134 tons per year, and other heavy oil-fired power plants such as Yeosu Thermal Power in Korea are also generated in large quantities. Therefore, heavy oil ash powder may have the effect of reinforcing the fixed carbon component of lower coal and recycling heavy oil ash, which is designated waste.
  • the present invention takes advantage of the difference in wettability of the carbon component of the hydrophobic heavy ash powder with hydrophobic (Hydrophobic) and the combined water having hydrophilic (ie, wettability), that is, the repulsion between the hydrophilic bonded moisture and the carbon component of hydrophobic lower coal,
  • a certain amount of heavy oil ash powder is used as a catalyst, which increases hydrophobicity with the combined moisture and increases surface tension to promote decomposition with lower coal, which irradiates microwaves.
  • the bonded water such as the pore water and the capillary bond water, it generates heat, drying the bonded water and the capillary water at a temperature of 150 ° C.
  • the method according to the present invention as described above is about 2 to 120 to 150 °C drying carried out at conventional 400 °C or more After about 5 minutes, high-quality coal with moisture content of less than 10% and calorific value of 6,500 kcal / kg or more can be obtained.
  • FIG. 1 is a system diagram of a high-grade coal leveling device according to the present invention
  • FIG. 2 is an enlarged view of a main part of FIG. 1
  • FIG. 3 is an enlarged view of the porous plate shown in FIG. 1
  • FIG. 4 is AA of FIG. 1.
  • 5 is an enlarged cross-sectional view of the vibrating fluid plate shown in FIG. 1.
  • the high-grade carbonization unit of the lower carbon comprises a low coal supply unit, heavy oil ash powder supply unit, heating air supply unit, low coal drying and stabilization unit and high-grade coal storage unit.
  • the lower coal supply unit includes a lower coal storage tank 1 in which lower coal is stored, and a lower coal rotary feeder 2 and a diaphragm 3 for transferring the lower coal to the lower stored coal.
  • the lower coal need not be limited as described above, and may be used without limitation as long as the water content is 30% or more.
  • the particle size of the lower coal need not necessarily be limited, but lower coal having a particle size of 10 to 30 mm is used so that drying can be performed smoothly. If necessary, it may be ground before drying to have the above-described particle size. Coal having such a particle size is transferred to the lower coal inlet 17 by the rotary feeder 2 and the diaphragm 3.
  • the heavy oil ash powder supply unit stores the heavy oil ash powder storage tank 4 in which the heavy oil ash powder is stored, the heavy oil ash powder powder mill 5 for grinding the heavy oil ash powder to a particle size of 74 ⁇ m or less, and the fine oil ash powder stored therein.
  • Heavy oil ash powder storage tank (6), heavy oil ash powder bag filter (7) for collecting the powder scattering in the storage tank, and rotary valve (8) and heavy oil ash powder feed screw for transferring the heavy oil ash powder to the lower part (9) is made.
  • the heavy ash powder uses combustion by-products of heavy oil-fired power plants, and the particle size of the heavy oil ash powder is not necessarily limited, but it is preferable to use a particle size of 74 ⁇ m or less for effective drying.
  • the heated air supply unit is a heat exchanger 13 for recovering heat of the blower 10 and the dried and stabilized high quality coal, and a heater 14 for heating the heat exchanged air with the air for drying the heat exchanger 13.
  • the heated air obtained from the heated air supply unit is used for primary drying of lower coal.
  • the heating air supply unit is a pressure gauge 11 and a flow meter 12 for adjusting the air volume, a bypass valve 15 of the atmospheric air to be used as circulating air, heating injection air as shown in the drawing It may further comprise a temperature meter 16 for measuring the temperature of.
  • the lower coal drying and stabilizing unit is a lower coal inlet 17 into which coal transported through the lower coal supply unit is input, and a heavy oil ash powder inlet 18 into which heavy oil ash powder transferred through the heavy oil ash powder supply unit is input.
  • the porous plate 211 is provided with an air inlet 20 on one side for primarily drying the lower coal, and the first dried lower coal and heavy oil ash powder are mixed to produce microwaves at 120-150 ° C.
  • Lower coal stabilizer 21 for secondary drying, a steam suction unit 22 for sucking steam decomposed in the drying process of the lower coal, for discharging the dried and stabilized coal
  • the primary drying may be made by injecting heated air of 100 ⁇ 130 °C to the lower coal.
  • heavy oil ash powder having a particle size of 74 ⁇ m or less is added in an amount of 5 to 20 parts by weight based on 100 parts by weight of lower coal.
  • the porous plate 211 as shown in Figure 3, the pore 211a size is maintained at 1/5 ⁇ 1/10 of the particle size of 10 ⁇ 30mm of the lower coal particles lower coal particles are the pores 211a It is desirable not to pass.
  • the lower coal stabilization device 21 is a wave-type vibration flow plate for uniform mixing of the primary dried lower coal and heavy oil ash powder introduced from the heavy oil ash powder inlet 18. 215, microwave feeders 213a and 213b for microwave drying the mixture of the lower coal and the heavy oil ash powder, and a temperature sensor 214 for measuring the temperature inside the mixture of the lower coal and the heavy oil ash powder. It can be made, including.
  • the microwave feeders 213a and 213b continue to irradiate microwaves until the temperature of the mixture of lower coal and heavy oil ash powder reaches 120-150 ° C, and the microwave irradiation stops automatically when the temperature inside the mixture exceeds 150 ° C. You can do that.
  • the microwave supplies 213a and 213b may be partially or entirely formed on / off repeating structure.
  • the microwave feeders 213a and 213b may be disposed to cross each other without facing each other for preventing a magnetron failure due to the inflow of microwaves and for uniform irradiation.
  • the microwave feeders 213a and 213b are not limited to the accompanying drawings, and may be arranged in various shapes as necessary.
  • the temperature sensor 214 is disposed between the microwave supply (213a, 213b) that is not irradiated with microwaves.
  • the choke 218 is formed of an aluminum material having high microwave permeation resistance at the inlet and the outlet to prevent leakage thereof.
  • Reference numerals 216 and 217 are connecting portions and fixing portions for connecting the upper and lower plates of the lower coal stabilization device, respectively.
  • the wave-shaped vibration flow plate 215 is adjusted in direction from the inlet to the outlet, as shown in Figure 5, and forms a wave shape for smooth mixing and adsorption with heavy oil ash powder
  • the transmission resistance of the microwave is very low and composed of a Teflon material that transmits microwaves most of the time.
  • the high quality coal storage unit includes a rotary feeder 24 of high quality coal transferred through the high quality coal outlet 23 of the lower coal drying and stabilization unit, and a high quality coal storage tank 25 for storing the transferred high quality coal. It is configured to include.
  • the low-grade coal having a moisture content of 30% or more and the calorific value of 4,500 kcal / kg or less is made into a high quality coal for generating power of 10% or less of the moisture content and 6,500 kcal / kg or more.
  • the high-grade coal-degrading device of the lower coal is a vapor phase powder recoverer 28 for collecting powder in dry steam sucked by the steam inlet 22 attached to the upper portion of the lower coal stabilizer 21, the recovered Heavy oil powder recirculation blower 27 for recirculating powder, a powder suction pump 29 for sucking dry steam after collecting the powder, a condenser 30 for condensing the inhaled vapor phase air, and gas in the condensed condensate
  • the gas-liquid separator 31 for separating, a condensate storage tank 32 for storing the condensate coming down from the gas-liquid separator, and further comprising a decomposition gas phase powder recovery unit comprising a circulation pump 33 for sending the condensate to the cooling water.
  • the heavy oil ash recovered through this process is recycled to use.
  • the low-grade coal high-quality device may further include an accessory facility comprising a vibration fluidizer lower spring 34, a vibration supply device 35, a vibration fluid support unit 36.
  • the low-grade coal high-quality device according to the present invention is made of aluminum oxide (Al2O3) material in order to block the leakage of microwaves
  • the porous plate 211 provided with the air inlet 20 is corrosion resistance and wear resistance Applying excellent stainless steel (SUS310) material
  • the vibrating fluid plate 215 is made of Teflon material with a low permittivity for the purpose of permeation of the supplied microwave
  • Temperature sensor 214 for measuring is preferably made of a stainless steel shielding material.
  • the microwave supply is 2.45 GHz, 2 kW, 220 V, single phase, and two vibration supply devices 35 of 0.45 kW capacity are attached to both sides to uniformly vibrate the vibrating fluidized bed body.
  • the overall low carbon high-definition device shape is shown in FIG. 2, and the device volume is 100 cm for the porous plate 211, and the wave shaped vibration flow plate 215 is 200 cm long, 30 cm wide, and 30 cm high.
  • the temperature sensors 214a and 214b used a stainless steel shielded thermocouple, and the diameter of the mounting portion for installing them was 1 cm, and the steam suction portion 22, the lower coal inlet 17, and the heavy ash powder inlet 18 were installed. The area of was set to 2 inches x 2 inches.
  • the size of the pores 211a of the perforated plate is 1 / 5-1 / 10 of the particle size of low coal particles 10-30mm, consisting of 154 5 shafts and 4 long shafts each with a diameter of 5mm.
  • the plate 215 was composed of a thickness bottom side 215a 2cm, a top height side 215b 5cm, and a width 215c 20cm as shown in FIG.
  • Coal 1 type of imported coal from Indonesia
  • Coal size 20mm particle size
  • Heavy oil powder supply 5kg / hr
  • Example 1 after the first drying, the secondary oil drying of the heavy oil ash powder and the microwave drying were performed in parallel. Comparative Example 1 was carried out in the same manner as in Example 1, except that heavy oil ash powder was not added, Comparative Example 2 was only microwave drying without the addition of heavy oil ash powder without the first drying, Comparative Example 3 2 We did not carry out car drying itself.
  • the fuel ratio is a fixed carbon content / volatile content (FC / VM).
  • low-grade coal has a water content of about 36.4 (about 36%), and a heat content of 6,291 Kcal / kg based on drying is higher than anthracite but lower than 6,500 kcal / kg of coal for coal-fired power plants.
  • the fuel cost was 0.86, which is similar to the sub-bituminous series, and it was confirmed that the fuel was suitable for the specification as a thermal power plant fuel when the moisture was dried to 10% or less.
  • the heavy oil-powdered ash powder used as an additive has a moisture content of 5.65%, a calorific value of 7,553 Kcal / kg, and a high fixed carbon content of 70.80%.
  • Example 1 In the case of Example 1 irradiated with heavy oil ash powder and microwave according to the present invention, the high-grade coal produced had a very low water content of 5.0% and a very high heat content of 7,210 kcal / kg. In particular, the fuel cost has a characteristic of greatly improved to 0.93. From the physical properties of Table 2, it was found to be suitable as a raw material for burning coal-fired power plants. However, Comparative Examples 1 to 3 corresponding to other methods were found to be very difficult to dry to less than 10% moisture.
  • the spontaneous ignition was investigated using a bench scale test apparatus using the high quality coal produced in Examples 1 to 4, and the results are shown in FIG. 6.
  • spontaneous ignition is carried out by placing a sample of a certain volume (106 mm in diameter and 350 mm in height) in a bench test device, heating it to 50 ° C. in a nitrogen atmosphere, and then switching the atmosphere to dry air. It evaluated by comparing the time until the temperature of reaches 80 degreeC and 150 degreeC.
  • the control shown in Figure 6 shows the experimental results of the bituminous coal used in the coal-fired power plant.
  • the high-grade coal of Example 1 according to the present invention covers the pores and active sites on the surface of the heavy oil fine powder added and mixed during the drying process to react with oxygen in the air.
  • the time to reach 80 ° C. and 150 ° C. was measured for a very long time compared to bituminous coal and other coals of the comparative examples, and as a result, it was found that spontaneous combustion was relatively low.

Abstract

La présente invention concerne un procédé et un appareil pour valoriser du charbon de rang bas présentant une teneur en eau d'au moins 30% en un charbon destiné à la génération de courant et présentant une teneur en eau de 10% au maximum, et une valeur calorifique d'au moins 6 500 kcal/kg, par le biais de l'utilisation de cendres de pétrole lourd et d'un procédé de séchage par micro-ondres, ce qui empêche la combustion spontanée du charbon valorisé en charbon de rang élevé.
PCT/KR2010/004177 2009-06-29 2010-06-28 Procédé et appareil pour valoriser du charbon de rang bas WO2011002187A2 (fr)

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KR1020090058576A KR100960793B1 (ko) 2009-06-29 2009-06-29 저급 석탄의 고품위화 방법 및 장치
KR10-2009-0058576 2009-06-29

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CN102796588A (zh) * 2011-05-26 2012-11-28 烟台龙源电力技术股份有限公司 褐煤干燥方法及装置
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