WO2015064997A1 - 재열증기 방식 석탄 건조 시스템 - Google Patents

재열증기 방식 석탄 건조 시스템 Download PDF

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Publication number
WO2015064997A1
WO2015064997A1 PCT/KR2014/010160 KR2014010160W WO2015064997A1 WO 2015064997 A1 WO2015064997 A1 WO 2015064997A1 KR 2014010160 W KR2014010160 W KR 2014010160W WO 2015064997 A1 WO2015064997 A1 WO 2015064997A1
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Prior art keywords
coal
drying
fuel
conveyor
reheat steam
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PCT/KR2014/010160
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English (en)
French (fr)
Korean (ko)
Inventor
김성곤
Original Assignee
주식회사 한국테크놀로지
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Priority to CA2928249A priority Critical patent/CA2928249A1/en
Priority to CN201480057861.1A priority patent/CN105723174A/zh
Priority to RU2016120979A priority patent/RU2630046C1/ru
Priority to US15/032,210 priority patent/US20160272909A1/en
Priority to AU2014340860A priority patent/AU2014340860B2/en
Publication of WO2015064997A1 publication Critical patent/WO2015064997A1/ko
Priority to PH12016500785A priority patent/PH12016500785A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • 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
    • 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
    • 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
    • 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
    • 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
    • C10L2270/00—Specifically adapted fuels
    • C10L2270/04—Specifically adapted fuels for turbines, planes, power generation
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/02—Combustion or pyrolysis
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/06—Heat exchange, direct or indirect
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/08—Drying or removing water
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/14—Injection, e.g. in a reactor or a fuel stream during fuel production
    • C10L2290/148—Injection, e.g. in a reactor or a fuel stream during fuel production of steam
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/28—Cutting, disintegrating, shredding or grinding
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/40—Applying a magnetic field or inclusion of magnets in the apparatus
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
    • C10L2290/546—Sieving for separating fractions, components or impurities during preparation or upgrading of a fuel
    • 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
    • C10L9/083—Torrefaction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B19/00—Machines or apparatus for drying solid materials or objects not covered by groups F26B9/00 - F26B17/00
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure

Definitions

  • the present invention relates to a system for drying coal using reheat steam, and more particularly, to a coal drying system for removing moisture contained in coal used as fuel of a thermal power plant with reheat steam.
  • coal-fired coal-fired power plants burn about 180 tons / hr of coal per 500 MW, and supply about 37 tons of coal to a boiler each quarter.
  • the coal-fired 500MW coal-fired power plant is equipped with approximately six 500 tonnes of coal storage, five of which provide a normal supply of coal, and one reserve reserves for use over a period of time. It is operated by low coal.
  • the standardized design criteria for coal is 6,080 Kcal / Kg and less than 10% low moisture bituminous coal.
  • Some coal-fired power plants use imported coal, some of which have a mean water content of more than 17%, which reduces the combustion efficiency of the boiler. If the calorific value of coal used at the standardized combustion limit of 5,400 Kcal / Kg is low, the generation efficiency and fuel consumption are expected to decrease due to lower combustion efficiency.
  • sub-bituminous coal which is a low-molecular coal with high moisture content, the water content is higher than the design standard, and the transfer system for transporting coal is not smooth. In some cases, however, the heat distribution in the boiler may be drift and operate in an abnormal state.
  • the use of sub-bituminous coal has gradually increased from 41 to 60% in order to reduce fuel costs in thermal power plants.
  • thermal drying is a rotary drying method of drying coal particles inside with a hot gas while rotating a shell of a cylinder into which coal is injected, and high temperature drying while supplying coal from top to bottom.
  • Coal is divided into surface moisture attached to pores between coal particles and bonded moisture bonded to pores in coal.
  • the surface moisture is mostly water sprayed during the washing process and transportation and storage in the mountain area, and the amount is determined according to the surface area and absorbency. The smaller the particles, the larger the surface area and the formation of capillaries between the particles. This increases the moisture content.
  • the combined moisture is formed in the coal generator, and is followed by lignite, bituminous coal (bituminous coal, sub-bituminous coal) and anthracite coal. If the coal has a lot of moisture, the calorific value is lowered and the transportation cost is increased, so it is necessary to control the moisture in the process of mixing, crushing and separating coal.
  • the present invention separates the coal supplied from the low coal into fuel for the reheat steam generator and fuel for driving the generator in the thermal power plant, and generates reheat steam in the reheat steam generator and then uses the reheat steam.
  • the purpose of the present invention is to increase the calorific value of coal by drying the coal for supplying the coal to maintain the proper moisture content, and to reduce the fuel consumption by improving the combustion efficiency of the thermal power plant boiler.
  • Another object of the present invention is to provide a drying technology and a technology applicable to a thermal power plant to prevent environmental problems caused by incomplete combustion of coal by controlling moisture contained in coal.
  • the present invention in the coal drying system, the coal transported through the coal transport conveyor in the low coal is classified as fuel and drying for discharge to the coal transport conveyor for fuel and drying coal transport conveyor respectively.
  • Coal sorting apparatus A fluidized bed reheater which stores the coal classified and transported for the fuel in a fuel storage tank for fuel and heats the fuel coal stored in the coal storage tank in a fluidized bed to generate reheat steam at a predetermined temperature;
  • a combustion gas reheater that generates reheat steam at a predetermined temperature using combustion gas generated in the fluidized bed reheater using exhaust gas generated after coal drying in the coal drying apparatus.
  • the coal sorting apparatus is a magnetic separator for selecting a metal material from the coal before the coal screen conveyor is introduced into the coal screen with a magnetic field, and coal having a predetermined particle size among the coal transported to the coal transport conveyor at low coal.
  • a coal screen for separating the primary a coal crusher for crushing coal having a predetermined particle size separated from the coal screen, a two-way damper for separating fuel for use and drying among the coal crushed in the coal crusher, and a fuel in the two-way damper. It may include a coal supply tank for fuel for storing and supplying the separated coal for coal, and a coal mill for pulverizing the coal supplied from the coal supply tank to a predetermined particle diameter or less through the coal transport conveyor for fuel. .
  • the coal separated from the coal screen or separated for drying in the two-way damper may be connected to be discharged to the drying coal transfer conveyor.
  • the coal distribution conveyor for distributing the drying coal to the plurality of coal drying apparatus in the drying coal transfer conveyor, a coal distribution tank for storing and distributing coal transferred from the coal distribution conveyor, and the coal It may include a coal feeder for supplying a predetermined amount of coal distributed in the distribution tank to the coal drying apparatus.
  • a dry coal discharge conveyor for naturally cooling the coal dried in the coal drying apparatus at room temperature
  • a dry coal transfer conveyor for transferring the coal discharged from the dry coal discharge conveyor to a dry coal storage tank
  • the drying The coal transfer conveyor may further include a loading-field dust collector for collecting dust generated during the transfer of coal.
  • the coal drying apparatus further includes a plurality of exhaust gas circulation blowers for sucking and blowing exhaust gas generated after coal drying, and a circulating exhaust gas dust collector for collecting dust contained in the exhaust gas blown in the exhaust gas circulation blower.
  • a plurality of exhaust gas circulation blowers for sucking and blowing exhaust gas generated after coal drying
  • a circulating exhaust gas dust collector for collecting dust contained in the exhaust gas blown in the exhaust gas circulation blower.
  • the coal transport conveyor, coal sorting device, fuel coal transport conveyor, drying coal transport conveyor and coal distribution conveyor may further include an entry dust collector for collecting dust generated during the transport of coal.
  • the fluidized bed reheater and combustion gas reheater may be configured to supply reheat steam to a plurality of coal drying apparatus respectively installed.
  • the present invention is classified into coal used for thermal power plants and fuel coal for drying the coal, and then reheat steam is generated as fuel coal to remove moisture remaining inside and outside the coal, which is the fuel used in the thermal power plant.
  • Prevents incomplete combustion of coal improves calorie calories and minimizes emissions of pollutants, improves corrosion prevention and durability of the system, reduces spontaneous ignition rate due to water loss, reduces the pulverization of coal mills and generates power during coal combustion. It is possible to improve the heat distribution of the boiler, to eliminate the blockage of the moving passage during the transfer of coal, and to improve the stability of the coal supply by increasing the utilization of low-grade coal with less demand.
  • low-calorie coal which is cheaper than high-calorie coal, to reduce fuel costs and costs by reducing coal imports, and to relatively reduce coal consumption, thereby reducing waste and pollutant emissions from combustion gases. It can enjoy the effect of reducing CO2 and CO2, and it can be expected to replace foreign technology and export of equipment.
  • FIG. 1 is a block diagram showing a reheat steam type coal drying system according to the present invention.
  • FIG. 2 is a block diagram showing a reheat steam type coal drying system according to the present invention.
  • the low coal 10 is a place for storing and storing coal for use as a boiler fuel of the thermal power plant.
  • Coal contains surface and internal moisture.
  • the coal stored in the low coal 10 is sprayed periodically to prevent the scattering of coal powder.
  • Coal stored in the low coal 10 is transferred to a coal drying system through a conveying means such as a conveyor system.
  • a portion of the coal transported from the low coal 10 to the coal drying system is used as a fuel for reheat steam generation for drying coal for the coal-fired power plant fuel. Therefore, the coal of the low coal 10 is transferred to the coal sorting apparatus 100 using a coal conveying conveyor CV1.
  • the coal sorting apparatus 100 classifies the fuel coal and the drying coal, and the coal transported from the low coal 10 through the coal transport conveyor CV1 is classified as fuel and dry coal transport conveyor for fuel (CV2). ) And drying coal transfer conveyor (CV3) respectively.
  • the magnetic separator 110 of the coal sorting apparatus 100 selects a metallic material from a coal before being fed into the coal screen 120 from a coal transfer conveyor CV1 as a magnetic field. Magnetic screening using the magnetic separator 110 is to classify the pieces having the magnetic component using a magnetic component in the coal transported on the coal transport conveyor (CV1).
  • the coal screen 120 primarily separates coal having a predetermined particle size from the coal transferred to the coal transfer conveyor CV1 from the low coal 10.
  • the coal screen 120 is separated from the coal of about 20mm or less and sent to the drying coal transport conveyor (CV3), and to transport the remaining coal having a particle size larger.
  • the coal screen 120 has a built-in screw conveyor.
  • Coal crusher 130 is to crush the coal of a predetermined particle size or more separated and transported from the coal screen (120).
  • the coal crusher 130 crushes coal by a roller having a saw tooth.
  • Two Way Damper (140) is to separate the coal for fuel and the drying coal from the coal crushed in the coal crusher 130.
  • a part of the coal separated from the two-way damper 140 is separated into a fuel supply tank 150 for fuel, and the remaining coal is separated and transferred to a drying coal transfer conveyor CV3.
  • the coal supply tank 150 for fuel stores and supplies coal separated for fuel from the two-way damper 140.
  • the coal mill 160 disintegrates the coal supplied from the coal supply tank 150 for fuel to a predetermined particle diameter or less and discharges the coal through a coal transport conveyor CV2 for fuel.
  • the coal storage tank 210 for fuel stores coal transported and classified for fuel in a coal transport conveyor CV2 for fuel.
  • the fuel coal storage tank 210 supplies a predetermined amount of fuel coal to the fluidized bed reheater 200 through a screw conveyor installed at the bottom.
  • the fluidized bed reheater 200 receives the coal for fuel stored in the fuel coal storage tank 210 and heats the coal to the fluidized bed by the supplied flow air to generate reheat steam at a predetermined temperature.
  • the fluidized bed reheater 200 is supplied with flames and combustion air of a burner for preheating before the coal for fuel is supplied and ignited.
  • the carbonized ash in the fluidized bed reheater 200 is carried out to the outside through the discharge conveyor.
  • the reheat steam generated in the fluidized bed reheater 200 is supplied to one or more coal drying apparatuses 300.
  • coal-coal distribution conveyor (CV3) is passed through the coal distribution conveyor (CV4) for distributing the drying coal to one or more coal drying apparatus (300).
  • the coal transferred from the coal distribution conveyor CV4 is stored in the coal distribution tank 310 and then distributed to the coal metering supply 320.
  • the coal quantity feeder 320 supplies the coal distributed in the coal distribution tank 310 to the coal drying apparatus 300 in a predetermined amount.
  • the coal drying apparatus 300 sprays the reheat steam generated from the fluidized bed reheater 200 to the coal to be transported at a constant speed while the coal is transported to the stage.
  • the coal drying apparatus 300 is provided with two upper and lower facilities, and is installed to dry by spraying the re-heat steam to the coal while transporting the coal by using a dryer installed in the upper and lower stages for each facility.
  • the coal drying apparatus 300 is a waste heat after drying the coal with the reheat steam supplied from the fluidized bed reheater 200, that is, the exhaust gas (Exhaust Gas) is a circulating exhaust gas dust collector 330 by the operation of a plurality of exhaust gas circulation blower It is circulated through the fluidized bed reheater 200 and the combustion gas reheater 400 through.
  • the circulating exhaust gas dust collector 330 collects the circulating material contained in the exhaust gas introduced through the plurality of exhaust gas circulation blowers and discharges it to the outside.
  • the combustion gas reheater 400 heats the exhaust gas generated after coal drying in the coal drying apparatus 300 by using a combustion gas introduced in the fluidized bed reheater 200 and introduced into a reheat steam having a predetermined temperature. That is, the combustion gas reheater 400 exchanges the combustion gas generated from the fluidized bed reheater 200 with the exhaust gas so that the combustion gas reheater 400 is supplied back to the coal drying apparatus 300 in the form of reheat steam.
  • the combustion gas heat-exchanged in the combustion gas reheater 400 is supplied to the thermal power plant through the combustion gas induction blower, and the combustion material separated from the combustion gas is discharged to the outside through the re-extraction conveyor.
  • the reheat steam is supplied to the coal drying apparatus 300 installed in plural from the fluidized bed reheater 200 and the combustion gas reheater 400, respectively, and the coal gas is discharged from the fluidized bed reheater 200.
  • the exhaust gas discharged from the drying apparatus 300 is generated and circulated as reheat steam.
  • the coal dried by the reheat steam in the coal drying apparatus 300 is discharged to the dry coal discharge conveyor (CV5).
  • the dried coal is transferred to a dry coal discharge conveyor (CV5), and the natural cooling is performed at room temperature.
  • the coal, which is naturally cooled in the dry coal discharge conveyor (CV5), is transferred to the dry coal storage tank 600 through the dry coal transfer conveyor (CV6).
  • the discharge dust collector 510 collects the dust generated during the transfer of coal in the dry coal transfer conveyor CV6 and discharges it to the outside.
  • coal drying system is generated during the transfer of coal from the coal transfer conveyor (CV1), coal sorting apparatus 100, the coal transfer conveyor for fuel (CV2), the dry coal transfer conveyor (CV3) and the coal distribution conveyor (CV4).
  • An entrance dust collector 500 for collecting the collected dust is installed.
  • the reheat steam type coal drying system transfers the coal stored in the low coal storage 10 to the coal sorting apparatus 100 to classify the coal into fuel coal and drying coal.
  • the coal of the low coal 10 is transported through the coal transport conveyor CV1
  • the magnetic metal in the magnetic separator 110 separates the iron metal contained in the coal by the magnetic field.
  • Coal passed through the magnetic separator 110 is introduced into the coal screen 120, the coal scaffold 120 is separated from the input coal of a predetermined particle diameter, that is, less than approximately 20mm coal by drying coal transfer conveyor (CV3)
  • the coal is discharged to a coal crusher 130 having a predetermined particle size or more.
  • the coal crusher 130 crushes the coal to a predetermined particle size or less and then sends it to the two-way damper 140.
  • the two-way damper 140 separates the crushed coal for fuel and for drying.
  • the two-way damper 140 discharges the drying coal to the drying coal transfer conveyor CV3 and discharges the coal for fuel to the coal supply tank 150 for fuel.
  • the coal grinder 160 pulverizes the fuel coal injected from the fuel coal supply tank 150 to a fuel coal transport conveyor CV2 after crushing the fuel coal below a predetermined particle diameter, that is, approximately 5 mm or less.
  • the drying coal separated and discharged from the coal screen 120 and the two-way damper 140 is introduced into the coal distribution conveyor CV4 through the drying coal transfer conveyor CV3.
  • the coal distribution conveyor CV4 distributes and transfers the drying coal to the plurality of coal drying apparatuses 300.
  • Drying coal distributed and transferred from the coal distribution conveyor (CV4) is introduced into the coal distribution tank 310, the coal distribution tank 310 is a predetermined amount of drying coal through the coal metering supply 320 is a coal drying device ( 300).
  • the fuel coal transferred through the fuel coal transport conveyor (CV2) is injected into the fuel coal storage tank 210.
  • the fuel coal of the fuel coal storage tank 210 is introduced into the fluidized bed reheater 200.
  • the fluidized bed reheater 200 ignites the injected coal for fuel and generates hot reheated steam by the fluidized bed with the supplied fluidized air.
  • Reheat steam is a high temperature superheated steam.
  • the coal drying apparatus 300 injects the high temperature reheat steam supplied from the fluidized bed reheater 200 to dry the drying coal at the lower part of the conveyor which transfers the drying coal input from the coal quantity feeder 320 to the multi-stage. Let's do it.
  • Coal drying apparatus 300 is installed two conveyor equipment up and down, each conveyor equipment is dried by spraying the re-heat steam to the coal while transporting the coal using a dryer installed in the upper and lower two stages.
  • Dry coal made by reheat steam in the coal drying apparatus 300 is naturally cooled at room temperature while being discharged through the dry coal discharge conveyor (CV5). Dry coal naturally cooled in the dry coal discharge conveyor (CV5) is stored in the dry coal storage tank (600) via the dry coal transfer conveyor (CV6). Dry coal stored in the dry coal storage tank 600 is used to be transferred to the boiler fuel of the thermal power plant.
  • the exhaust gas corresponding to the waste heat after being injected into the drying coal in the coal drying apparatus 300 is passed through the exhaust gas circulation blower after the circulating material is collected in the circulating exhaust gas dust collector 330, the fluidized bed reheater 200 or the combustion gas ash Circulated into the hot air 400 is injected.
  • the combustion gas reheater 400 reheats the exhaust gas using the combustion gas discharged from the fluidized bed reheater 200 to generate a reheat steam to be input to the coal drying apparatus 300 to dry coal.
  • the loading station dust collector 500 is a coal transfer conveyor (CV1), a coal screen 120 of the coal sorting apparatus 100 and a coal supply tank 150 for fuel, a coal transfer conveyor for fuel (CV2), In the drying coal transfer conveyor (CV3) and coal distribution conveyor (CV4) to collect the coal dust generated during the separation and transfer of coal.
  • the unloading dust collector 510 collects dust generated during the transfer of coal from the dry coal conveying conveyor CV6.
  • the reheat steam type coal drying system allows the drying coal to be dried with the reheat steam after separating the coal of the low coal for the fuel used for the thermal power plant and the fuel for generating the reheat steam.
  • the thermal efficiency is improved.
  • the reheat steam type coal drying system separates the coal supplied from the low coal into fuel for the apparatus for generating the reheat steam and fuel for driving the generator in the thermal power plant, and generates reheat steam in the reheat steam generator. After drying the coal for supply to the thermal power plant by using the reheat steam to maintain the proper moisture content of the coal to increase the calorific value of the coal, improve the combustion efficiency of the thermal power plant boiler to reduce fuel consumption, There is a possibility.

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  • Chemical & Material Sciences (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Drying Of Solid Materials (AREA)
PCT/KR2014/010160 2013-10-30 2014-10-28 재열증기 방식 석탄 건조 시스템 WO2015064997A1 (ko)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA2928249A CA2928249A1 (en) 2013-10-30 2014-10-28 Coal drying system using reheat steam
CN201480057861.1A CN105723174A (zh) 2013-10-30 2014-10-28 再热蒸汽方式的煤炭干燥系统
RU2016120979A RU2630046C1 (ru) 2013-10-30 2014-10-28 Система сушки угля, использующая вторично перегретый пар
US15/032,210 US20160272909A1 (en) 2013-10-30 2014-10-28 Coal driving system using reheat steam
AU2014340860A AU2014340860B2 (en) 2013-10-30 2014-10-28 Coal drying system using reheat steam
PH12016500785A PH12016500785A1 (en) 2013-10-30 2016-04-27 Coal drying system using reheat steam

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KR101497571B1 (ko) * 2014-06-17 2015-03-02 주식회사 한국테크놀로지 석탄 건조 장치에서의 분진 감소 및 분산 공급을 위한 석탄 공급 장치
KR20150145339A (ko) * 2014-06-18 2015-12-30 한국남동발전 주식회사 저압 과열증기를 이용한 재열방식 석탄 건조장치
CN104456598B (zh) * 2014-11-13 2017-02-15 上海理工大学 过热蒸汽干燥制粉系统
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CN105723174A (zh) 2016-06-29
PH12016500785A1 (en) 2016-06-20
AU2014340860B2 (en) 2016-10-13
US20160272909A1 (en) 2016-09-22
RU2630046C1 (ru) 2017-09-05
AU2014340860A1 (en) 2016-04-28
CA2928249A1 (en) 2015-05-07

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