US20160272909A1 - Coal driving system using reheat steam - Google Patents

Coal driving system using reheat steam Download PDF

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Publication number
US20160272909A1
US20160272909A1 US15/032,210 US201415032210A US2016272909A1 US 20160272909 A1 US20160272909 A1 US 20160272909A1 US 201415032210 A US201415032210 A US 201415032210A US 2016272909 A1 US2016272909 A1 US 2016272909A1
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coal
drying
fuel
reheater
conveyor
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Sung Kon Kim
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Hankook Technology Inc
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Hankook Technology Inc
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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 that removes moisture contained in the coal used as a fuel for thermal power plant by the reheat steam.
  • coal of about 180 tons/hr per 500 MW is combusted, and the coal equivalent to about 37 tons per differentiator is supplied to a boiler.
  • the thermal power plant of 500 MW that uses the coal approximately six coal yards having capacity of approximately 500 tons are installed, the normal supply of coal is performed in five of them, and the remaining one is operated as a coal storage location that preliminarily stores the coal capable of being used for a certain period of time.
  • a standard thermal power design criterion of coal is designed to use a low moisture bituminous coal of 6,080 Kcal/Kg and 10% or less.
  • Imported coal is used in some thermal power plants, and an average moisture water content of some sub-bituminous coals of them may be equal to or higher than 17%, which lowers the combustion efficiency of the boiler.
  • the standard thermal combustion limit is 5,400 Kcal/Kg and a heating value of the used coal is low, a decrease in the power generation amount and an increase in the fuel consumption are expected due to a decline in the combustion efficiency.
  • the sub-bituminous coal that is a high-moisture and low-calorific coal
  • a conveyance system for conveying the coal is not smooth, and when grinding the coal using a differentiator, a decline in the efficiency, a decline in the combustion efficiency due to some incomplete combustion, a deviation of a heat distribution generated in the boiler, and operation in an abnormal state also occur.
  • the proportion of use of the sub-bituminous coal has gradually increased to about approximately 41 to 60%.
  • the low-calorific coal is about 47% among the total deposits of the world's coal and its deposits are much, since there are problems of a low calorific value, a high moisture content and a combustion failure during combustion, and the high moisture low calorific coal has a difficulty in complete combustion, it is ignored in the market.
  • many constructions of the thermal power generation that uses coal have recently been planned due to a sharp rise in the price of petroleum and a sense of insecurity to the nuclear power generation.
  • thermo drying a rotary drying method for drying the internal coal particles, while rotating a cylindrical shell into which coal is charged, a flash pneumatic drying method for raising and drying the high-temperature dry gas from bottom to top, while supplying the coal from top to bottom, and a fluid-bed drying method for drying the coal, while the high-temperature dry gas being raised upward along with fine particles have been mainly used.
  • Coal is divided into a surface moisture adhered to a gap between the coal particles, and a coupling moisture coupled to an internal pore of the coal.
  • the surface moisture moisture sprayed during a cleaning process in the production area and at the time of transport and storage is most, and its amount is determined depending on a surface area and absorbency. As the particles are small, the surface area becomes greater, capillary is formed between the particles, and contains moisture, and a water content increases.
  • the coupling moisture is formed at a generation epoch of the coal, and is low in the order of lignite, bituminous coal (bituminous coal and sub-bituminous coal), and anthracite coal. When the coal has much moisture, the heating value decreases and the transport costs also increase. Thus, it is necessary to control the moisture in the process of mixing, pulverizing, and separation of the coal.
  • An object of the present invention is to divide coal supplied from a coal yard into a fuel for generating reheated steam and a fuel for driving a generator in a thermal power plant, to dry the coal for being supplied to the thermal power plant by the use of the reheat steam after generating a reheat steam in a reheat steam generator so as to maintain the proper moisture content of the coal, thereby enhancing the heating value of coal to improve the combustion efficiency of the boiler of the thermal power plant and reduce the use of fuel.
  • Another object of the present invention is to provide a drying technique capable of preventing environmental problems due to incomplete combustion of the coal through the regulation of the moisture contained in the coal, and a technique that can be applied to a thermal power plant.
  • a reheat steam type coal drying system that includes: a coal sorting device that sorts coal transported via a coal transport conveyer from a coal yard into a fuel coal and a drying coal and discharges the coal to a fueling coal transport conveyer and a drying coal transport conveyer; a fluidizing reheater that stores the coal sorted and transported as fuel in a fuel coal storage tank, and heats the fuel coal stored in the coal storage tank to a fluidized state to generate reheat steam at a constant temperature; a coal drying device that dries the coal by spraying the reheat steam generated by the fluidizing reheater to the coal, while the coal introduced via a coal distributing conveyer for distributing the coal is transported by the drying coal transport conveyer through multiple steps; and a combustion gas reheater that generates reheat steam at a constant temperature using exhaust gas generated after the coal is dried in the coal drying device by using combustion gas generated in the fluidizing reheater.
  • the coal sorting device may include a magnetic separator that separates a metal material from coal before being charged into coal screen by a magnetic field in a coal transport conveyor, a coal screen that preliminarily separates coal of a certain particle diameter or less from the coal transported from the coal yard to the coal transport conveyor; a coal pulverizer that pulverizes the coal of a certain particle diameter or more separated from the coal screen, a two-way damper that separates the coal pulverized by the coal pulverizer into a fuel coal and a drying coal, a coal supply tank that temporarily stores the coal separated as a fuel coal by the two-way damper and then supplies the coal, and a coal pulverizer that discharges the coal through a fuel coal transport conveyor after pulverizing the coal supplied from the coal supply tank to a certain particle or less.
  • a magnetic separator that separates a metal material from coal before being charged into coal screen by a magnetic field in a coal transport conveyor, a coal screen that preliminarily separates coal
  • the coal separated by the coal screen or separated as a drying coal by the two-way damper may be connected so as to be discharged to a drying coal transport conveyor.
  • the system may include a coal distribution conveyor that distributes the drying coal into a plurality of coal dryers in the drying coal transport conveyor, a coal distribution tank that temporarily stores the coal transported by the coal distribution conveyor and then distributes the coal, and a coal fixed amount supplier that supplies the coal distributed from the coal distributor tank to the coal drying device at a certain amount.
  • the system may further include a dry coal discharge conveyor that naturally cools the coal dried in the coal drying device at room temperature, a dry coal transport conveyor that transports the coal discharged from the dry coal discharge conveyor to a dry coal storage tank, and a carry-out place dust collector that collects the dust generated during transport of the coal on the dry coal transport conveyor.
  • the system may further include a plurality of exhaust gas circulation blowers that sucks and blows the exhaust gas generated after the coal drying in coal drying device, and a circulation exhaust gas dust collector that collects the dust contained in the exhaust gas blown by the exhaust gas circulation blower.
  • the system may further include a carry-in place dust collector that collects the dust generated during transport of the coal in the coal transport conveyor, the coal sorting device, the fuel coal transport conveyor, the drying coal transport conveyor and the coal distribution conveyor.
  • the system may be configured to supply the reheat steam to each of the plurality of coal drying devices installed in the fluidizing reheater and the combustion gas reheater.
  • a calorific value of the coal is improved, the discharge of the pollutants is minimized, corrosion of the system is prevented, its durability is improved, the natural ignition rate with a decrease in moisture is reduced, the grinding efficiency of the coal differentiator and the heat distribution of the power boiler during combustion of coal are improved, it is possible to eliminate the clogging phenomenon of the path at the time of transport of coal, and it is possible to improve the stability of the coal supply by enhancing the utilization rate of the low-grade coal of the low-demand.
  • FIG. 1 is a block diagram of a reheat steam type coal drying system according to the present invention.
  • FIG. 2 is a block diagram illustrating a reheat steam type coal drying system of the present invention.
  • a coal yard 10 is a place where coal for use as fuel for boilers of thermal power plants is kept and stored.
  • the coal contains surface moisture and internal moisture. Further, water is periodically sprayed to the coal stored in the coal yard 10 to prevent scattering of coal powder.
  • the coal stored in the coal yard 10 is transported to the coal drying system through a transport means such as a conveyor system. Further, in the coal yard 10 , some of the coal transported to the coal drying system are sorted and used as reheat stem generating fuel for drying the fuel coal of the thermal power plant. Thus, the coal in the coal yard 10 is transported to the coal sorting device 100 using a coal transport conveyor CV 1 .
  • a coal sorting device 100 that sorts coal transported via a coal transport conveyer CV 1 from a coal yard into a fuel coal and a drying coal and discharges the coal to a fueling coal transport conveyer CV 2 and a drying coal transport conveyer CV 3 , respectively.
  • a magnetic separator 110 of the coal sorting device 100 separates a metal substance from coal before being charged into a coal screen 120 in a coal transport conveyor CV 1 by a magnetic field.
  • the magnetic separation using the magnetic separator 110 sorts the coal transported by being boarded on the coal transport conveyor CV 1 into pieces of iron having magnetic properties.
  • the coal screen 120 primarily separates the coal of a certain particle size or less from the coal transported to the coal transport conveyor CV 1 from the coal yard 10 .
  • the coal of approximately 20 mm or less is separated from the coal screen 120 and is sent to the dry coal transport conveyor CV 3 , and the remaining coal with particle sizes greater than that is transported.
  • the coal screen 120 is equipped with a screw conveyor or the like.
  • the coal crusher 130 crushes the coal of a certain particle diameter or more that is separated from the coal screen 120 and is transported.
  • the coal crusher 130 finely pulverizes the coal by a roller formed with tooth.
  • the two-way damper 140 is intended to separate the coal pulverized in the coal crusher 130 into the drying coal and the fuel coal. Some of the coal separated from the two-way damper 140 is separated into a fuel coal supply tank 150 and the remaining coal is separated and transported to the drying coal transport conveyor CV 3 .
  • the fuel coal supply tank 150 temporarily stores the coal separated for fuel from the two-way damper 140 and thereafter supplies it.
  • the coal pulverizer 160 pulverizes the coal supplied from the fuel coal supply tank 150 to a constant particle diameter or less, and thereafter, discharges the coal through the fuel coal transport conveyor CV 2 .
  • the fuel coal storage tank 210 stores the coal that is sorted and transported for the fuel from the fuel coal transport conveyor CV 2 .
  • the fuel coal storage tank 210 supplies a certain amount of fuel coal to the fluidizing reheater 200 through the screw conveyor disposed at the lower end.
  • the fluidizing reheater 200 receives provision of the fuel coal stored in the fuel coal storage tank 210 to heat the coal to a fluidized state by the supplied flowing air and generates reheat steam of a constant temperature or more.
  • the fluidizing reheater 200 is supplied with flame and combustion air of a burner for preheating before being ignited by being supplied with the fuel coal. Ash carbonized in the fluidizing reheater 200 is carried out to the outside through a discharge conveyor.
  • the reheat steam generated in the fluidizing reheater 200 is supplied to one or more coal drying devices 300 .
  • the coal goes through a coal distribution conveyor CV 4 that distributes the drying coal from the drying coal transport conveyor CV 3 to one or more of coal drying devices 300 . Further, the coal transported from the coal distributor conveyor CV 4 is temporarily stored in the coal distributor tank 310 , and then is distributed to the coal fixed amount supplier 320 . The coal fixed amount supplier 320 supplies a certain amount of coal distributed from the coal distributor tank 310 to the coal drying device 300 .
  • the coal drying device 300 dries the coal, by spraying the reheat steam generated in the fluidizing reheater 200 to the coal transported at a constant speed, while the coal is transported in multiple stages.
  • Two upper and lower coal drying devices 300 are equipped, and are installed to dry the coal by spraying the reheat steam to the coal, while transporting the coal using the dryer installed in two upper and lower stages for each facility.
  • the waste heat after drying the coal by the reheat steam supplied from the fluidizing reheater 200 i.e., the exhaust gas is circulated to the fluidizing reheater 200 and the combustion gas reheater 400 via the circulation exhaust gas dust collector 330 by the operation of the plurality of exhaust gas circulation blowers.
  • the circulation exhaust gas dust collector 330 collects the circulating material contained in the exhaust gas flowed in through a plurality of exhaust gas circulation blowers and discharges it to the outside.
  • the combustion gas reheater 400 heats the exhaust gas generated after the coal drying in the coal drying device 300 to a reheat steam of a constant temperature, by utilizing the combustion gas flowed by being generated in the fluidizing reheater 200 . That is, the combustion gas reheater 400 causes the combustion gas generated in the fluidizing reheater 200 to heat-exchange with the exhaust gas to be supplied to the coal drying system 300 again in the form of the reheat steam.
  • the combustion gas subjected to the heat exchange in the combustion gas reheater 400 is supplied to the thermal power plant through the combustion gas induction blower, and the combustion ash separated from the combustion gas is discharged to the outside via a re-discharge conveyor.
  • the system is configured so that the reheat steam is supplied to each of the plurality of coal drying devices 300 installed in the fluidizing reheater 200 and the combustion gas reheater 400 , and the exhaust gas discharged from the coal drying device 300 by the combustion gas discharged from the fluidizing reheater 200 is generated and circulated as a reheat steam.
  • the coal dried by the reheat steam in the coal drying device 300 is discharged to the dry coal discharge conveyor CV 5 . While the dried coal is transported to the dry coal discharge conveyor CV 5 , the natural cooling takes place at room temperature. Further, the coal subjected to the natural cooling in the dry coal discharge conveyor CV 5 is transported to a dry coal storage tank 600 via a dry coal transport conveyor CV 6 . At this time, the dust collector 510 collects the dust generated during the transport of coal in the dry coal transport conveyor CV 6 and discharges the dust to the outside.
  • the coal drying system is equipped with carry-in place dust collector 500 that collects the dust generated during transport of the coal in the coal transport conveyor CV 1 , the coal sorting device 100 , the fuel coal transport conveyor CV 2 , the dry coal transport conveyor CV 3 and the coal distribution conveyor CV 4 .
  • the reheat steam type coal drying system transports the coal stored in the coal yard 10 and sorts the coal into fuel coal and drying coal.
  • the iron metal contained in coal is separated using a magnetic field by the magnetic separator 110 .
  • the coal passing through the magnetic separator 110 is charged into the coal screen 120 , and the coal screen 120 separates and discharges the coal of a constant particle size or less in the charged coal, i.e., about 20 mm or less to the drying coal transport conveyor CV 3 , and discharges the coal of a certain particle diameter or more to the coal crusher 130 .
  • the coal crusher 130 sends the coal to the two-way damper 140 , after pulverizing the coal to a constant particle diameter or less.
  • the two-way damper 140 separately discharges the pulverized coal into the fuel coal and the drying coal.
  • the two-way damper 140 discharges the drying coal to the drying coal transport conveyor CV 3 , and discharges the fuel coal to the coal supply tank for fuel 150 .
  • the coal pulverizer 160 discharges the fuel coal to the fuel coal transport conveyor CV 2 , after pulverizing the fuel coal charged from the fuel coal supply tank 150 to a certain particle diameter or less, i.e., about 5 mm or less.
  • the drying coal separated and discharged from the coal screen 120 and the two-way damper 140 is charged to the coal distribution conveyor CV 4 via the dry coal transport conveyor CV 3 .
  • the coal distribution conveyor CV 4 distributes and transports the drying coal to the plurality of coal drying devices 300 .
  • the drying coal distributed and transported in the coal distribution conveyor CV 4 is charged into the coal distribution tank 310 , and the coal distribution tank 310 allows the a certain amount of drying coal to be charged into the coal drying device 300 through the coal fixed amount supplier 320 .
  • the fuel coal transported via the fuel coal transport conveyor CV 2 is charged into a fuel coal storage tank 210 .
  • the fuel coal of the fuel coal storage tank 210 is charged to the fluidizing reheater 200 .
  • the fluidizing reheater 200 generates a high-temperature reheat steam due to a fluidized state by the supplied flowing air after igniting the charged fuel coal.
  • the reheat steam is a high-temperature superheated steam.
  • the coal drying device 300 dries the drying coal, by injecting the high-temperature reheat steam supplied from the fluidizing reheater 200 at the bottom of the conveyor transported in multi-stages to the drying coal charged from the coal fixed amount supplier 320 .
  • the coal drying device 300 is formed by installing the two upper and lower conveyor equipment, each of the conveyor equipment dries the coal by injecting the reheat steam to the coal, while transforming the coal using the driers installed in the upper and lower two-stages.
  • the dry coal dried by the reheat steam in the coal drying device 300 is naturally cooled at room temperature, while being discharged through the dry coal discharge conveyor CV 5 .
  • the dry coal naturally cooled in the dry coal discharge conveyor CV 5 is stored in the dry coal storage tank 600 via the dry coal transport conveyor CV 6 .
  • the dry coal stored in the dry coal storage tank 600 is transported and used as fuel for boilers of the thermal power plants.
  • the exhaust gas corresponding to the waste heat after being injected to the drying coal in the coal drying device 300 is circulated and charged to the fluidizing reheater 200 or the combustion gas reheater 400 , after the circulation material is collected in the circulation exhaust gas dust collector 330 via the exhaust gas circulation blower.
  • the combustion gas reheater 400 reheats the exhaust gas using the combustion gas discharged from the fluidizing reheater 200 , generates it as the reheat steam, charges it to the coal drying device 300 and can dry the coal.
  • the carry-in dust collector 500 collects the coal dust generated during the separation and transport of the coal in the coal transport conveyor CV 1 , the coal screen 120 of the coal sorting device 100 and the fuel coal supply tank 150 , the fuel coal transport conveyor CV 2 , the drying coal transport conveyor CV 3 and the coal distribution conveyor CV 4 . Further, the carry-out dust collector 510 collects the dust generated during the transport of coal in the dry coal transport conveyor CV 6 .
  • the drying coal can be dried by the reheat steam, and the system improves the thermal efficiency of coal.
  • the reheat steam type coal drying system separates coal supplied from a coal yard into a fuel for generating the reheat steam and fuel for driving the generator in the thermal power plant, dries the coal for being supplied to the thermal power plant using the reheat stem after generating the reheat steam in the reheat steam generator, maintains the proper moisture content of the coal to enhance the heating value of the coal, thereby being able to improve the combustion efficiency of the boiler of the thermal power plant and to reduce the amount of use of fuel, and there is industrial applicability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • 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)
US15/032,210 2013-10-30 2014-10-28 Coal driving system using reheat steam Abandoned US20160272909A1 (en)

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KR1020130129752A KR101408148B1 (ko) 2013-10-30 2013-10-30 재열증기 방식 석탄 건조 시스템
KR10-2013-0129752 2013-10-30
PCT/KR2014/010160 WO2015064997A1 (ko) 2013-10-30 2014-10-28 재열증기 방식 석탄 건조 시스템

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CN (1) CN105723174A (zh)
AU (1) AU2014340860B2 (zh)
CA (1) CA2928249A1 (zh)
PH (1) PH12016500785A1 (zh)
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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
KR101761319B1 (ko) * 2017-01-24 2017-07-25 이주선 갈탄 건조 시스템 및 갈탄 건조 방법
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CN105723174A (zh) 2016-06-29
PH12016500785A1 (en) 2016-06-20
AU2014340860B2 (en) 2016-10-13
RU2630046C1 (ru) 2017-09-05
WO2015064997A1 (ko) 2015-05-07
AU2014340860A1 (en) 2016-04-28
CA2928249A1 (en) 2015-05-07

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