WO2019106796A1 - Dispositif de distribution de charbon pulvérisé et procédé de suppression d'élution d'élément trace toxique - Google Patents

Dispositif de distribution de charbon pulvérisé et procédé de suppression d'élution d'élément trace toxique Download PDF

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Publication number
WO2019106796A1
WO2019106796A1 PCT/JP2017/043122 JP2017043122W WO2019106796A1 WO 2019106796 A1 WO2019106796 A1 WO 2019106796A1 JP 2017043122 W JP2017043122 W JP 2017043122W WO 2019106796 A1 WO2019106796 A1 WO 2019106796A1
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WO
WIPO (PCT)
Prior art keywords
coal
elution
pulverized
feeder
pulverized coal
Prior art date
Application number
PCT/JP2017/043122
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English (en)
Japanese (ja)
Inventor
英嗣 清永
健治 引野
啓一郎 盛田
Original Assignee
中国電力株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中国電力株式会社 filed Critical 中国電力株式会社
Priority to PCT/JP2017/043122 priority Critical patent/WO2019106796A1/fr
Priority to JP2018513561A priority patent/JP6744401B2/ja
Publication of WO2019106796A1 publication Critical patent/WO2019106796A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam

Definitions

  • the present invention relates to a pulverized coal feeding device and a harmful trace element elution suppression method.
  • it is a pulverized coal feeding apparatus and a harmful trace element elution suppression method for use in a coal thermal power plant using pulverized coal as a fuel for a boiler, wherein the elution inhibitor is a fine powder that suppresses the elution of harmful trace elements from combustion residue of coal.
  • the present invention relates to the structure of a pulverized coal feeding device and a method for suppressing harmful trace element elution, which can be reliably added to charcoal at a constant rate.
  • pulverized coal is used as fuel for a boiler.
  • the coal stored in the coal storage plant is discharged, and coal is transported to the pulverized coal feeding device by a coal transport mechanism such as a conveyor.
  • the pulverized coal supply apparatus includes a coal pulverizer (mill) that pulverizes massive coal into fine particles to form pulverized coal.
  • Pulverized coal produced by the coal pulverizer is sent to a boiler and burned in the boiler.
  • the combustion heats the water to generate steam.
  • oil may be supplied to the boiler.
  • the steam generated in the boiler is supplied to a steam turbine, a generator is driven by the steam turbine, and power can be supplied by the generator.
  • the steam that has passed through the steam turbine is condensed by the condenser and condensed to the boiler together with the makeup water.
  • the pulverized coal supply apparatus described above includes a coal bunker storing coal, a coal feeder, and a coal pulverizer.
  • a coal bunker storing coal
  • coal feeder a coal feeder
  • coal pulverizer a coal pulverizer
  • the coal feeder has a transfer conveyor inside, and coal supplied from the coal feeding pipe is horizontally transferred by the transfer conveyor. Then, coal is discharged from the transfer conveyor to the coal discharge port formed at the end of the transfer conveyor. Furthermore, coal is introduced into the coal pulverizer through a second coal feed pipe formed in connection with the coal discharge port.
  • the call gate valve for opening and closing the first coal feeding pipe is disposed immediately above the feeder. The call gate valve can be opened and closed manually.
  • coal ash to be a residue after combustion contains trace amounts of harmful trace elements such as boron, fluorine, selenium, arsenic and hexavalent chromium.
  • harmful trace elements such as boron, fluorine, selenium, arsenic and hexavalent chromium.
  • an elution inhibitor for coal addition consisting of calcium carbonate (CaCO 3 ) to coal
  • CaO calcium oxide
  • alkali Discloses a method for suppressing the elution of harmful trace elements that contributes to the suppression of elution of harmful trace elements (see, for example, Patent Document 2).
  • the harmful trace element elution suppression method according to Patent Document 2 can be easily applied to the improvement of existing equipment because addition of the elution inhibitor is added at the stage of coal during combustion or before combustion instead of coal ash after combustion. And. Moreover, the harmful trace element elution suppression method by patent document 2 will not be specifically limited if the timing of addition is addition in the state of coal, Any of a coal feeder, a coal pulverizer, and a boiler may be sufficient, And
  • Patent Document 2 discloses the timing of the addition of the harmful trace element elution inhibitor, the place where the harmful trace element elution inhibitor is injected is not specified.
  • Pulverized coal supply apparatus and harmful trace element elution suppression method for use in a coal thermal power plant using pulverized coal as fuel for a boiler, wherein mixing ratio of coal and elution control agent of harmful trace element falls within a certain ratio
  • the present invention has been made in view of such problems, and it is a pulverized coal supply device and a harmful trace element elution suppression method used for a coal-fired power generation facility using pulverized coal as a fuel for a boiler It is an object of the present invention to provide a pulverized coal feeding apparatus and a harmful trace element elution suppression method, in which the mixing ratio of a trace element elution inhibitor can be contained in a constant ratio.
  • the present inventors comprise a pulverized coal feeding apparatus comprising a conveyer for conveying coal, and a coal pulverizer disposed below the downstream end of the conveyer and crushing coal to form pulverized coal.
  • Dispense elution inhibitor that suppresses elution of harmful trace elements from above the conveyer conveyor or coal pulverizer to make the mixing ratio of coal and elution inhibitor of harmful trace elements constant by dropping it into the coal pulverizer
  • the inventors have invented the following new pulverized coal feeding apparatus and harmful trace element elution suppression method as follows.
  • a pulverized coal supply apparatus includes: a coal bunker storing coal; a coal feeder including therein a conveyer for conveying coal supplied from the coal bunker from one end to the other end; And a pulverized coal feeder including a coal pulverizer for pulverizing coal input from the other end of the feeder to produce pulverized coal, wherein the feeder is configured to discharge coal. And a box-shaped frame with the coal discharge opening at the bottom of the other end, and an elution inhibitor that can suppress the elution of harmful trace elements from the combustion residue of coal toward the coal discharge opening of the frame. And an elution inhibitor addition device.
  • the elution inhibitor addition device includes a hopper storing the elution inhibitor, and a screw feeder for feeding the elution inhibitor supplied from the hopper toward the coal discharge port of the frame. Is preferred.
  • the coal feeder includes a first motor for driving the conveyer, and the anti-elution agent addition device includes a second motor for driving the screw feeder, and corresponds to the rotational speed of the first motor.
  • the rotational speed of the second motor is adjusted.
  • the said elution inhibiting agent contains 1 or more types selected from the group which consists of a limestone, a limestone, and quick lime.
  • the elution inhibitor is preferably in the form of granules or powder.
  • the harmful trace element elution suppression method according to the present invention is the harmful trace element elution suppression method in a coal-fired thermal power plant equipped with a pulverized coal feed device, wherein the pulverized coal feed device comprises a conveyor for conveying coal; A coal pulverizer disposed below the downstream end of the conveyer and crushing coal to form pulverized coal; harmful trace elements from above the conveyer or the coal pulverizer The elution inhibitor which suppresses the elution of is dropped to the said coal pulverizer.
  • the rotational speed of the second motor for driving the screw feeder that feeds the elution inhibitor toward the coal pulverizer is adjusted in accordance with the rotational speed of the first motor for driving the transport conveyor. Is preferred.
  • the pulverized coal feeding device is disposed at the end of the conveyer, and the elution inhibitor addition device is disposed above the coal discharge port from which coal is discharged, and the elution of harmful trace elements in the elution inhibitor addition device
  • the mixing ratio of coal and the elution inhibitor of harmful trace element can be made constant by storing the inhibitor and supplying the elution inhibitor of harmful trace element from the elution inhibitor addition device toward the coal discharge port.
  • the harmful trace element elution suppression method is a harmful trace element elution suppression method in a coal-fired power plant equipped with a pulverized coal feeding device, wherein the pulverized coal feed device comprises a conveyer for conveying coal, and a downstream of the conveyer. And a coal pulverizer, which is disposed below the end of the side to pulverize coal to produce pulverized coal, and which prevents elution of harmful trace elements from above the conveyer conveyor or the coal pulverizer.
  • the agent By dropping the agent into a coal pulverizer, the mixing ratio of coal and the elution inhibitor of harmful trace elements can be made constant.
  • FIG. 1 is a schematic view showing a configuration of an example of a coal-fired power plant using a pulverized coal supply apparatus according to an embodiment of the present invention.
  • FIG. 2 is a front view showing the configuration of a pulverized coal supply device according to an embodiment of the present invention.
  • a coal-fired power plant 100 includes a pulverized coal supply device 10 and a boiler 20.
  • the coal-fired power plant 100 further includes a steam turbine 30 and a condenser 40.
  • the pulverized coal supply device 10 includes a coal bunker 11 and a coal feeder 12.
  • the pulverized coal feeding device 10 further includes an elution inhibitor adding device 13 and a coal pulverizer 14.
  • coal C is conveyed to a coal bunker 11 by a conveyor 15 with a dustproof cover from a coal storage station (not shown). Then, massive coal C is temporarily stored in the coal bunker 11. Coal C stored in the coal bunker 11 is supplied to the coal feeder 12.
  • the coal feeder 12 internally includes a transport conveyor 12 c.
  • the transport conveyor 12 c can transport the coal C supplied from the coal bunker 11 from one end to the other end.
  • the coal pulverizer 14 can pulverize the coal C fed from the other end of the coal feeder 12 to produce pulverized coal.
  • the boiler 20 internally includes a combustion chamber 2 r fueled by pulverized coal produced by the coal pulverizer 14.
  • oil is sent to the combustion chamber 2 r via an oil feed pipe (not shown).
  • pulverized coal can be burned.
  • combustion air is sent to the combustion chamber 2r by a ventilator.
  • two-stage combustion is performed. By this combustion, the water supplied from the feed pump 41 is heated to become superheated steam, and the superheated steam is sent from the boiler 20 to the steam turbine 30.
  • the steam turbine 30 internally includes a turbine (impeller). If the superheated steam is fed into the turbine from its axial direction, the turbine can be rotated. The rotating shaft of the turbine is connected to the rotor of the generator 31. When superheated steam is fed into the steam turbine 30, power can be supplied by the rotor of the generator 31 rotating.
  • a turbine impeller
  • the superheated steam that has consumed kinetic energy in the steam turbine 30 is returned to water by being cooled and condensed in the condenser 40. In other words, it is recovered.
  • the condensed water is circulated to the boiler 20 by the feed water pump 41 together with the makeup water.
  • the coal thermal power generation facility 100 heats water with the boiler 20 using pulverized coal as fuel to generate superheated steam, and sends the superheated steam to the steam turbine 30. Power can be supplied by the generator 31.
  • the coal bunker 11 is composed of an inverted conical main body 11 b whose top surface is opened and a coal feeding pipe 11 p extending from the bottom of the main body 11 b.
  • the coal feed pipe 11 p is connected to one end of the coal feeder 12. Bulk coal C stored in the main body 11 b can be dumped into the inside of the coal feeder 12 through the coal feeding pipe 11 p.
  • a call gate valve 11c is disposed in the middle of the coal feeding pipe 11p.
  • the call gate valve 11c is internally provided with a valve body capable of opening and closing the pipe line of the coal feeding pipe 11p.
  • the call gate valve 11 c connects the third motor 11 m.
  • the call gate valve 11c is internally provided with a conversion mechanism (not shown) for converting the rotational movement of the third motor 11m into the forward and backward movement of the valve body.
  • a conversion mechanism (not shown) for converting the rotational movement of the third motor 11m into the forward and backward movement of the valve body.
  • the coal feeder 12 includes a box-like frame 12 f and a conveyer 12 c.
  • the frame 12 f opens the coal outlet 12 s from which the coal C is discharged at the bottom of the other end.
  • the coal discharge port 12s is an inlet opening of a coal feeding pipe 14p connecting the frame 12f and the coal pulverizer 14.
  • the coal C discharged to the coal injection port 12s is fed to the coal pulverizer 14 and pulverized coal C is pulverized by the coal pulverizer 14, whereby pulverized coal can be produced.
  • the conveyer 12c is composed of a pair of rollers 121 and 122 and an endless belt 12v.
  • the pair of rollers 121 and 122 are spaced apart from each other.
  • the endless belt 12v winds a pair of rollers 121 and 122.
  • the roller 121 is a driving wheel
  • the roller 122 is a driven wheel.
  • the drive side roller 121 couples the first motor 12 m.
  • the first motor 12m When the first motor 12m is rotated in one direction, the upper side of the endless belt 12v can travel from one end to the other end, and the coal C supplied from the coal bunker 11 is conveyed toward the coal discharge port 12s it can.
  • the 1st motor 12m can adjust the input quantity per unit time of the coal C introduce
  • the anti-elution agent addition device 13 includes an inverted conical hopper 13 h having an open top and a screw feeder 13 f.
  • the hopper 13h stores the elution inhibitor Ea.
  • the elution inhibitor Ea can suppress the elution of harmful trace elements from the combustion residue of coal.
  • a gate valve 13v is provided between the hopper 13h and the screw feeder 13f.
  • the gate valve 13v can open and close a pipeline from the hopper 13h to the screw feeder 13f.
  • the pipeline from the hopper 13 h to the screw feeder 13 f can be opened and closed.
  • the screw feeder 13 f can send out the elution inhibitor Ea supplied from the hopper 13 h toward the coal discharge port 12 s of the frame 12 f.
  • the screw feeder 13f connects the second motor 13m.
  • the spiral screw 13s can be rotated to send out the elution inhibitor Ea in the axial direction.
  • the rotation of the second motor 13m corresponds to the rotational speed of the first motor 12m, that is, corresponding to the input amount of coal C input to the coal pulverizer 14 per unit time.
  • the amount of the elution inhibitor Ea can be adjusted at an appropriate rate.
  • the pulverized coal feeding device 10 is formed at the end of the conveyer 12c, and places a hopper 13h with a screw feeder 13f above the coal discharge opening 12s from which coal is discharged, Disposal agent Ea of harmful trace elements is stored in hopper 13h, and screw feeder 13f is driven to feed elution stop agent Ea of harmful trace elements from hopper 13h to coal injection port 12s, thereby causing harmful effects to coal and harmful substances.
  • the mixing ratio of the elution inhibitor Ea of trace element can be made constant.
  • the coal feeder 12 includes a first motor 12 m that drives the transfer conveyor 12 c. Further, the elution inhibitor adding device 13 is provided with a second motor 13m that drives the screw feeder 13f.
  • the rotational speed of the second motor 13m corresponding to the rotational speed of the first motor 12m, that is, corresponding to the input amount of coal C input to the coal pulverizer 14 per unit time.
  • the amount of elution inhibitor Ea can be adjusted at an appropriate rate.
  • the elution inhibitor Ea contains one or more selected from the group consisting of limestone, limestone and quicklime.
  • the elution inhibitor Ea is preferably in the form of granules or powder.
  • the average particle size of the elution inhibitor Ea preferably does not exceed 200 ⁇ m.
  • the pulverized coal and the elution inhibitor Ea can be mixed and delivered to the boiler 20.
  • the coal pulverizer 14 be internally provided with a classifier utilizing centrifugal force, so-called dry cyclone. After classifying the pulverized coal and the elution inhibitor Ea pulverized by the coal pulverizer 14 into predetermined particle sizes, it is possible to deliver the pulverized coal and the elution inhibitor Ea to the boiler 20.
  • the means for supplying elution inhibitor Ea to coal feeder 12 is not limited to screw feeder 13f.
  • the type of feeder or conveyor serving as the supplying means is not limited as long as the transportation means is suitable for powder transportation.
  • the elution inhibitor Ea may be dropped onto the conveyer 12c, and the elution inhibitor Ea for suppressing elution of harmful trace elements from above the coal pulverizer 14 is pulverized by a coal pulverizer. By dropping it to 14, the addition amount of the elution inhibitor Ea can be adjusted at an appropriate ratio with respect to the coal.
  • the pulverized coal supply apparatus adds the elution inhibitor to the feed speed of the first motor for driving the conveyer by separately providing the means for injecting coal and the elution inhibitor into the feeder. You can adjust the amount.
  • the harmful trace element elution suppression method according to the present invention can separately supply the coal and the elution inhibitor upstream of the coal pulverizer without mixing the coal and the elution inhibitor on the conveyor for conveying the coal to the coal bunker. Therefore, the amount of elution inhibitor added to coal can be adjusted.
  • the pulverized coal supply device can be expected to have the following effects. (1) By mixing with pulverized coal and feeding the elution inhibitor of the proper composition to the boiler and burning it at a high temperature, it is possible to accelerate the uptake of harmful trace elements into the coal ash. (2) Since the elution inhibitor mixed with pulverized coal is fed into the boiler and burned at a high temperature, harmful trace elements flowing from the exhaust gas into the desulfurization apparatus can be suppressed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

La présente invention concerne un dispositif de distribution de charbon pulvérisé avec lequel le rapport entre le charbon et un agent de prévention d'élution pour des éléments traces toxiques peut être uniforme. Ce dispositif de distribution de charbon pulvérisé 10 est pourvu de : un silo à charbon 11 dans lequel du charbon est stocké ; un distributeur de charbon 12 qui comporte dans celui-ci un dispositif de transport 12c qui transporte le charbon distribué depuis le silo à charbon 11 ; et un pulvérisateur de charbon 14 qui pulvérise le charbon chargé depuis le distributeur de charbon 12 et génère du charbon pulvérisé. Le distributeur de charbon 12 est pourvu d'un cadre en forme de boîte 12f et d'un dispositif d'ajout d'agent de suppression d'élution 13. Le cadre 12f comporte un orifice de chute de charbon 12s depuis lequel le charbon est évacué et qui est ouvert au niveau d'une partie inférieure d'une autre partie d'extrémité. Le dispositif d'ajout d'agent de suppression d'élution 13 peut laisser tomber, vers l'orifice de chute de charbon 12s dans le cadre 12f, un agent de suppression d'élution Ea pour supprimer l'élution d'éléments traces toxiques depuis le résidu de combustion du charbon.
PCT/JP2017/043122 2017-11-30 2017-11-30 Dispositif de distribution de charbon pulvérisé et procédé de suppression d'élution d'élément trace toxique WO2019106796A1 (fr)

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PCT/JP2017/043122 WO2019106796A1 (fr) 2017-11-30 2017-11-30 Dispositif de distribution de charbon pulvérisé et procédé de suppression d'élution d'élément trace toxique
JP2018513561A JP6744401B2 (ja) 2017-11-30 2017-11-30 微粉炭供給装置及び有害微量元素溶出抑制方法

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PCT/JP2017/043122 WO2019106796A1 (fr) 2017-11-30 2017-11-30 Dispositif de distribution de charbon pulvérisé et procédé de suppression d'élution d'élément trace toxique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114505160A (zh) * 2022-01-05 2022-05-17 国能龙源环保有限公司 燃煤锅炉协同固废资源化利用直掺系统及其工作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113996237A (zh) * 2021-11-03 2022-02-01 华能汕头海门发电有限责任公司 一种双煤仓多样切换调配机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60228598A (ja) * 1983-12-31 1985-11-13 レ−シエ・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング 石炭粉と石灰粉或はドロマイト粉から気体流ミルを使用して均質な混合物を造るための方法および装置
JPS631A (ja) * 1986-06-12 1988-01-05 株式会社　カント−技研 オガ自動製袋加圧成形充填装置
JP2000291936A (ja) * 1999-04-08 2000-10-20 Ishikawajima Harima Heavy Ind Co Ltd 重油灰燃焼装置
JP2007255809A (ja) * 2006-03-24 2007-10-04 Chugoku Electric Power Co Inc:The 制御装置
JP2008170108A (ja) * 2007-01-12 2008-07-24 Chugoku Electric Power Co Inc:The 有害微量元素溶出抑制方法
JP2013117316A (ja) * 2011-12-01 2013-06-13 Babcock Hitachi Kk 石炭焚きボイラプラント

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60228598A (ja) * 1983-12-31 1985-11-13 レ−シエ・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング 石炭粉と石灰粉或はドロマイト粉から気体流ミルを使用して均質な混合物を造るための方法および装置
JPS631A (ja) * 1986-06-12 1988-01-05 株式会社　カント−技研 オガ自動製袋加圧成形充填装置
JP2000291936A (ja) * 1999-04-08 2000-10-20 Ishikawajima Harima Heavy Ind Co Ltd 重油灰燃焼装置
JP2007255809A (ja) * 2006-03-24 2007-10-04 Chugoku Electric Power Co Inc:The 制御装置
JP2008170108A (ja) * 2007-01-12 2008-07-24 Chugoku Electric Power Co Inc:The 有害微量元素溶出抑制方法
JP2013117316A (ja) * 2011-12-01 2013-06-13 Babcock Hitachi Kk 石炭焚きボイラプラント

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114505160A (zh) * 2022-01-05 2022-05-17 国能龙源环保有限公司 燃煤锅炉协同固废资源化利用直掺系统及其工作方法

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