WO2019039579A1 - 粉砕機及びその運用方法 - Google Patents

粉砕機及びその運用方法 Download PDF

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Publication number
WO2019039579A1
WO2019039579A1 PCT/JP2018/031289 JP2018031289W WO2019039579A1 WO 2019039579 A1 WO2019039579 A1 WO 2019039579A1 JP 2018031289 W JP2018031289 W JP 2018031289W WO 2019039579 A1 WO2019039579 A1 WO 2019039579A1
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WO
WIPO (PCT)
Prior art keywords
housing
extinguishant
pressure
fuel
unit
Prior art date
Application number
PCT/JP2018/031289
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋輔 大西
光輝 松▲崎▼
浩明 金本
豊 竹野
啓樹 山口
昇吾 澤
Original Assignee
三菱日立パワーシステムズ株式会社
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.)
Filing date
Publication date
Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to KR1020207003418A priority Critical patent/KR102403109B1/ko
Priority to CN201880053796.3A priority patent/CN111050917B/zh
Publication of WO2019039579A1 publication Critical patent/WO2019039579A1/ja
Priority to PH12020500208A priority patent/PH12020500208A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/007—Mills with rollers pressed against a rotary horizontal disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/04—Safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast

Definitions

  • the present invention relates to a crusher equipped with a fire extinguishing facility and a method of operating the same.
  • Solid fuels such as coal and biomass, used in thermal power generation equipment and the like are pulverized into fine powder by a mill (crusher) and supplied to a combustion apparatus such as a boiler.
  • the mill grinds a solid fuel such as coal or biomass, which is fed from a coal feed pipe (or a biomass supply pipe) to a grinding rotary table, by chewing between the grinding rotary table and the grinding roller.
  • the fuel pulverized into fine powder is blown up by the carrier gas supplied from the outer periphery of the pulverizing rotary table, and is sieved according to the particle size by the classifier.
  • the small particle size fuel is transported to the combustion device.
  • Biomass fuels are attracting attention as one of the measures to reduce carbon dioxide emissions from boilers and the like that use fossil fuels. Biomass fuel is supplied to a mill in pellet form and pulverized, but it is likely to cause rapid combustion because it is easily ignited by, for example, static electricity. Therefore, when biomass is used as fuel, rapid combustion is more likely to occur than coal (pulverized coal), so it is necessary to strengthen safety management.
  • Patent Document 1 discloses that a pressure sensor is disposed on a vertical roller mill, and when the pressure sensor detects the occurrence of rapid combustion, a fire extinguishing agent is immediately ejected to prevent rapid combustion from becoming important. .
  • Patent Document 1 discloses that the occurrence of rapid combustion is detected by a pressure sensor and the fire extinguishing agent is ejected, the installation position of the extinguishant injector and the installation position of the pressure sensor in consideration of suppression of rapid combustion.
  • Patent Document 2 also discloses the installation of a plurality of fire extinguishing agent injectors, it is specific to the relationship between the operation of the fire extinguishing system and the operation of the mill such as the operation procedure and control procedure. Not disclosed.
  • the extinguishant injector injects the extinguishant is as short as, for example, several tens of milliseconds and the sprayable range of the extinguishant is also limited, the extinguishant is injected only to the place where rapid combustion occurs. It is difficult to suppress the propagating flame just by doing this. If the distance from the fire extinguisher injector to the flame is too long, the flame will develop significantly and a large amount of extinguishant will be needed. Therefore, it is necessary to take measures for preventing rapid combustion in advance not only where rapid combustion occurs but also where flames easily propagate.
  • the rapid combustion can not be suppressed and damage to each component of the mill May occur.
  • the present invention has been made in view of such circumstances, and it is possible to detect that the rapid combustion has occurred or immediately before the occurrence of the rapid combustion and to inject the extinguishant at an appropriate position and timing. It aims at providing a possible crusher and its operation method.
  • a crusher includes a housing, a fuel supply pipe connected to a ceiling of the housing and supplying fuel to the inside of the housing, and an upper surface of the fuel supplied from the fuel supply pipe. And a rotary table arranged to rotate around a central axis, and arranged and rolled opposite to the rotary table, and pulverizing the fuel with the upper surface of the rotary table to form a pulverized material
  • a crushing unit having a crushing roller, an air supply pipe connected to the lower part of the housing and supplying air to the inside of the housing, and an upper part of the housing installed and wound up by air guided from the air supply pipe
  • a fine powder which is connected to a classifying portion for classifying the finely pulverized product and the ceiling portion of the housing, and which leads the finely pulverized product classified by the classifying unit to the outside
  • the first pressure detection unit or the second pressure detection unit When it is determined that there is a first extinguishant injection unit that injects a extinguishant to the pulverizing unit, and a position close to the classification unit, the first pressure detection unit or the second pressure detection unit And a second extinguishant injection unit for injecting an extinguishant to the classification unit when it is determined that the rapid combustion of the fuel has occurred or immediately before the occurrence of the rapid combustion based on the pressure.
  • the first pressure detection unit and the second pressure detection unit for detecting the pressure are provided in the vicinity of the crushing unit and the classification unit, which are likely sources of the rapid combustion ignition cause, and the ignition is caused
  • the extinguishant injection part is provided in the vicinity of the crushing part where the source and rapid combustion may propagate and in the vicinity of the classification part.
  • a feeder which is provided on the upstream side of the fuel supply pipe, supplies the fuel to the fuel supply pipe, and is installed in the feeder and detects a pressure inside the feeder.
  • the system may further include a third extinguishant injection unit that injects the extinguishant to the feeder.
  • the third pressure detection unit that detects the pressure is provided in the feeder that is the ignition cause source of the rapid combustion and may propagate the rapid combustion, and the vicinity of the ignition cause source and the crushing unit and the classification unit
  • the extinguishant injection part is provided in the vicinity of.
  • a rotary feeder installed in the fuel supply pipe and supplying the fuel for each predetermined amount, and installed upstream and / or downstream of the rotary feeder installed in the fuel supply pipe
  • the fuel supply pipe may further include a fourth extinguishant injection unit that injects the extinguishant.
  • the extinguishant injection unit is provided on the upstream side and / or downstream side of the rotary feeder installed in the fuel supply pipe where there is a possibility of rapid combustion propagation.
  • the fire extinguishing agent is injected into the fuel supply pipe, so that flame propagation due to rapid combustion in the mill can be suppressed or prevented.
  • the fuel is rapidly burned or rapidly burned based on the pressure detected by the first pressure sensing unit or the second pressure sensing unit installed in the pulverized material delivery pipe.
  • the system may further include a fifth extinguishant injection unit that injects an extinguishant to the finely pulverized material delivery pipe when it is determined that the occurrence is just before occurrence.
  • the extinguishant injection unit is provided in the pulverized material delivery pipe which may cause rapid combustion.
  • the fire extinguishing agent is injected to the pulverized material delivery pipe, so that flame propagation due to rapid combustion in the mill can be suppressed or prevented.
  • the housing further includes a wall member which is a cylindrical member extended between the grinding roller and the classification portion in the inside of the housing, and the fine portion is provided between the wall member and the housing.
  • An annular channel may be formed in which the pulverized material is wound up with the air, and the first extinguishant injection unit may inject the extinguishant to a space inside the wall material.
  • the plurality of first pressure detection units and the plurality of second pressure detection units are arranged in a zigzag at the upper and lower sides of the inside of the housing, and the plurality of first extinguishant spray units and the plurality of plurality of first pressure detection units.
  • the second extinguishant spray unit may be arranged in a zigzag form at the upper and lower sides of the inside of the housing.
  • a method of operating a crusher includes a housing, a fuel supply pipe connected to a ceiling of the housing and supplying fuel to the inside of the housing, and the fuel supply pipe supplied from the fuel supply pipe.
  • a method of operating a crusher including a pulverized material delivery pipe for guiding, wherein a first pressure detection unit installed near the crushing unit detects a pressure inside the housing, and the vicinity of the classification unit A
  • the present invention it is possible to detect that the rapid combustion has occurred or immediately before the occurrence of the rapid combustion and to inject the extinguishant at an appropriate position and timing.
  • FIG. 3 is a cross-sectional view showing a mill according to an embodiment of the present invention, as viewed in the direction of arrows along line III-III in FIG.
  • FIG. 4 is a cross-sectional view showing a mill according to an embodiment of the present invention, and is a view on arrow IV-IV in FIG. 2;
  • FIG. 5 is a partially enlarged cross-sectional view showing the housing of the mill, the extinguishant injector and the pressure sensor according to one embodiment of the present invention.
  • FIG. 1 The boiler installation 10 provided with the mill 1 which concerns on this embodiment is shown by FIG.
  • the boiler installation 10 is equipped with the mill 1 which grinds the biomass fuel supplied to the boiler main body 3.
  • the mill 1 may be in the form of crushing only biomass fuel, or may be in the form of crushing biomass fuel with coal.
  • biomass fuel is an organic resource derived from renewable organisms.
  • wood-based biomass fuel such as thinned timber, waste timber, driftwood, grass etc., non-woody material such as waste, dehydrated sludge, tires etc.
  • biomass fuel includes, for example, pellet-like and chip-like recycled fuels using these as raw materials, and is not limited to those presented here.
  • Biomass fuel or the like stored in the silo 5 is introduced to the mill 1 via the bunker 7, the feeder 6 and the coal feeding pipe 4.
  • a center chute 33 is connected to the mill 1, and biomass fuel is supplied to the inside of the mill 1 via the center chute 33.
  • the coal feeding pipe 4 and the center chute 33 constitute a fuel supply pipe according to the present invention.
  • the biomass fuel before grinding is circulated inside the coal feeding pipe 4 and it can be called a fuel feeding pipe before grinding, but it is called a coal feeding pipe 4 following a conventional coal mill.
  • a primary air duct (air supply pipe) 13 is connected to the mill 1.
  • the primary air duct 13 is connected to the primary air fan 15, and the air in which the air preheated by the air preheater 21 and the air bypassing the air preheater 21 are mixed is introduced. Further, a part of the exhaust gas that has passed through the electrostatic precipitator 23 is guided to the primary air duct 13 via the exhaust gas recirculation fan 17. Therefore, a mixture gas whose temperature is regulated by the air preheater 21 through the primary air duct 13 and whose oxygen concentration is regulated by the exhaust gas is introduced to the mill 1.
  • this mixture is expressed as air supplied through the primary air duct (air supply pipe) 13, but the substance is the gas as described above, and the application is crushed in the mill 1 It is a carrier gas for transporting fuel.
  • connection opening of the primary air duct 13 with the housing 31 of the mill 1 is inclined downward toward the inside of the mill 1. As a result, the finely pulverized material in the mill 1 is difficult to deposit in the primary air duct 13.
  • a coal feeding pipe (finely pulverized material delivery pipe) 9 is connected to the mill 1, and the finely pulverized substance in the form of particles crushed by the mill 1 is led to the burner 11 through the carbon feeding pipe 9.
  • the finely pulverized material is burned in the furnace of the boiler body 3, a flame is formed by the burner 11, and steam is generated by a heat exchanger (not shown).
  • the generated steam is, for example, guided to a steam turbine (not shown), and power generation is performed in the steam turbine.
  • the exhaust gas discharged from the boiler main body 3 is denitrified by the denitrification device 19 and then heats the air introduced from the primary air fan 15 by the air preheater 21. Thereafter, the exhaust gas is guided to the electrostatic precipitator 23, and after being dedusted by the electrostatic precipitator 23, is guided to the desulfurizing device 27 through the induction fan 25. On the upstream side of the induction fan 25, a part of the exhaust gas is extracted, and the extracted exhaust gas is introduced to the primary air duct 13 via the exhaust gas recirculation fan 17.
  • the position which extracts exhaust gas is not necessarily limited to the example shown in FIG. 1, and what is necessary is just to extract air from any of the exhaust gas system from the boiler main body 3 to the chimney 29.
  • the exhaust gas led downstream from the induction fan 25 is desulfurized by the desulfurizer 27 and then guided to the chimney 29 and released to the atmosphere.
  • FIG. 2 shows the details of the mill 1 shown in FIG.
  • FIG. 2 shows a mill (milling apparatus) 1 for pulverizing biomass fuel which is a raw material (fuel), and a mill facility including a raw material supply system of the mill 1 and a pulverized material conveyance system.
  • the mill equipment is equipped with a fire extinguishing system that suppresses rapid combustion.
  • the mill 1 is roughly divided into a crushing part 1A in the lower part and a classification part 1B in the upper part.
  • the mill 1 is a vertical mill and grinds solid biomass fuel, for example, pelletized wood-based biomass fuel.
  • the housing 31 of the mill 1 has a bowl-like cylindrical hollow shape, and a center chute 33 is attached to the central portion of the ceiling portion 32.
  • a coal feeding pipe 4 is connected between the feeder 6 and the center chute 33.
  • the center chute 33 is connected to the coal feeding pipe 4 and supplies the biomass fuel and / or coal led from the bunker 7 into the housing 31.
  • the center chute 33 is disposed at the center position of the housing 31 along the vertical direction (vertical direction), and the lower end portion is extended into the housing 31.
  • a mount 34 is installed at the lower part of the housing 31, and a grinding rotary table 35 is rotatably disposed on the mount 34.
  • the lower end portion of the center chute 33 is disposed to face the center of the grinding and rotating table 35.
  • the center chute 33 supplies biomass fuel and / or coal downward from above.
  • a rotary feeder 43 is attached to the coal feeding pipe 4, and the rotary feeder 43 cuts out a fixed amount of biomass fuel, that is, supplies a predetermined amount of biomass fuel.
  • the grinding and rotating table 35 is rotatable around a central axis in the vertical direction (vertical direction), and is driven by a driving device (not shown).
  • the upper surface of the grinding and rotating table 35 is inclined such that the central portion is high and lower from the central portion to the outer side, and the outer peripheral portion is shaped to be curved upward from the inner side to the outer side.
  • a plurality of, for example, three grinding rollers 36 are disposed above the grinding and rotating table 35 to face the grinding and rotating table 35.
  • the grinding rollers 36 are arranged at equal intervals in the circumferential direction (120 degrees in the case of three grinding rollers 36) above the outer peripheral portion of the grinding rotary table 35.
  • two grinding rollers 36 are illustrated symmetrically in FIG. 2 for the sake of explanation, when three grinding rollers 36 are arranged at an interval of 120 °, the arrangement of the grinding rollers 36 is the same as that of FIG. It differs from the illustration.
  • the grinding roller 36 is swingably connected to the pressure arm 37 via a bracket 38.
  • the bracket 38 is hingedly connected to the pressure arm 37.
  • the pressing arm 37 has a substantially hexagonal shape in a plan view, and is connected to the tension rod 39 at three points between adjacent grinding rollers 36. In FIG. 3, the pressure arm 37 and the tension rod 39 are partially omitted.
  • the bracket 38 is supported by the pressure arm 37, and the crushing roller 36 can be rocked relative to the pressure arm 37 by the bracket 38.
  • the pressure arm 37 is connected to a tension rod 39 accommodated in the tension rod box 40, and the pressure arm 37 adjusts the position in the vertical direction (vertical direction) by the tension rod 39. Thereby, the load acting on the solid matter on the grinding and rotating table 35 can be changed by the grinding roller 36.
  • the pulverizing roller 36 When the pulverizing rotary table 35 is rotated, the pulverizing roller 36 is driven by the force received from the pulverizing rotary table 35 and the solid matter and rolls around the rotation axis of the pulverizing roller 36.
  • the biomass fuel is pressed and pulverized between the pulverizing roller 36 and the pulverizing rotary table 35 by meshing thereof. Pulverized material is produced by pulverizing the biomass fuel.
  • the primary air duct 13 is connected to the lower portion of the housing 31.
  • the primary air 60 supplied by the primary air duct 13 is introduced into the housing 31 and supplied to the space located below the grinding and rotating table 35.
  • a space on the outer peripheral side of the bracket 38 supporting the grinding roller 36, that is, a space along the inner surface of the housing 31 is an annular flow channel 46 formed by the inner wall 45 and the housing 31.
  • the pulverized material passing through the annular flow channel 46 is blown up at a high flow rate as compared to a mill in which the inner wall 45 is not installed.
  • the inner wall 45 is a cylindrical member, and extends upward from the side portion on the outer peripheral side of the grinding roller 36 to the vicinity of the lower portion of the rotary classifier 41 inside the housing 31.
  • a rotary classifier 41 is provided at the upper part of the housing 31 .
  • the rotary classifier 41 is disposed to surround the center chute 33 and rotates around the center chute 33.
  • the plurality of fins 42 mounted on the outer circumferential side travel in the circumferential direction.
  • the pulverized material pulverized by the pulverizing rotary table 35 and the pulverizing roller 36 is rolled up by the flow of air rising from the lower side of the pulverizing rotary table 35 through the outer peripheral side of the pulverizing rotary table 35.
  • the pulverized material having a relatively large diameter is knocked off by the fins 42, returned to the pulverizing rotary table 35, and pulverized again.
  • the pulverized product is classified by the rotary classifier 41.
  • a plurality of coal feeding pipes 9 are connected to the ceiling portion 32.
  • the coal feeding pipes 9 discharge the finely pulverized material after classification by the rotary classifier 41, and the discharged finely pulverized material is the boiler main body Lead to 3.
  • the plurality of coal feeding pipes 9 are respectively connected to a plurality of openings provided corresponding to the ceiling portion 32.
  • the inside of the coal feeding pipe 9 circulates the pulverized biomass fuel and can be called a pulverized fuel feeding pipe, but it is called the coal feeding pipe 9 following the conventional coal mill.
  • the coal feeding pipe 9 changes in accordance with the size of the mill 1 and the grinding capacity, but is in the range of 2 to 8 and in many cases 4 to 6 in number.
  • the biomass fuel stored in the bunker 7 is carried by the belt of the belt feeder 8 built in the feeder 6 (a) and fed to the coal feeding pipe 4 and the center chute 33 (b).
  • the rotary feeder 43 attached to the coal feeding pipe 4 cuts out a fixed amount of biomass fuel, and the biomass fuel falls into the mill 1 (c).
  • the biomass fuel supplied into the mill 1 falls on the pulverizing rotary table 35 (d), moves to the outer peripheral side by centrifugal force, and is pulverized between the plurality of pulverizing rollers 36 and the pulverizing rotary table 35.
  • the pulverized material of pulverized biomass fuel ascends in the mill 1, particularly the annular channel 46, by the primary air 60 blown into the mill 1 through the primary air duct 13 and the throat vanes 44 (e).
  • the pulverized material passing through the annular flow channel 46 is blown up at a high flow rate as compared to a mill in which the inner wall 45 is not installed. Thereafter, the pulverized material is ejected from the upper end of the inner wall 45.
  • the rotary classifier 41 formed of a plurality of fins (blades) 42 is rotating, and the coarse and heavy pulverized material is knocked off so as to be repelled by the centrifugal force of the fins 42 (f) .
  • the finely pulverized material is repeatedly reground in the pulverizing unit 1A until it becomes fine.
  • the finely divided product (fineness) passes through the rotary classifier 41, exits the mill 1, and is air-conveyed to the outside through the coal feeding pipe 9 (g).
  • the finely pulverized material transported by air is sent to the burner 11 of the boiler body 3 and burns.
  • pressure sensors 61, 62, 63 for detecting abnormal pressure are provided in places that may be sources of ignition for rapid combustion, where sources of ignition and propagation of rapid combustion may occur
  • the fire extinguisher injectors 51, 52, 53, 54, 55 are provided on the
  • the extinguishant injectors 51 to 55 inject the extinguishant into the interior of the mill 1 or the like at a high speed for a short period of time (for example, several tens of milliseconds).
  • the extinguishant injected by the extinguishant injectors 51 to 55 is, for example, powdered sodium hydrogen carbonate (generally also referred to as baking soda), and high pressure injection by pressurized inert gas (for example, nitrogen (N 2 )) Be done.
  • the injection amount of sodium hydrogen carbonate as the extinguishing agent is about 100 kg to 300 kg in total of the amounts possessed by the extinguishant injectors 51 and 52 installed in one mill 1, to mention one example. This condition is appropriately determined by the size of the mill 1, the grinding capacity, and the like.
  • Sodium hydrogen carbonate not only has a high fire extinguishing ability, but also has the advantage that it is difficult to corrode each part of the steel mill 1. There is no risk of corrosion even if sodium hydrogen carbonate is attached to the inner wall surface etc. of the housing 31 of the mill 1 after cleaning the sprayed extinguishant.
  • the adhered sodium hydrogen carbonate is scrubbed by the newly supplied biomass fuel, and is transported to the burner 11 of the boiler body 3. Since the amount of sodium hydrogen carbonate to be transported is small compared to the biomass fuel, the combustion in the burner 11 is not inhibited.
  • the extinguishant injector 51 and the pressure sensor 61 are crushed in the vicinity of the crushing unit 1A in the housing 31, for example, in the height direction of the mill 1 at the lower side of the housing 31 of the mill 1 It is provided between the roller 36 and the pressure arm 37.
  • One extinguishant injector 51 and one pressure sensor 61 may be provided adjacent to each other as one set.
  • the extinguishant injector 51 injects the extinguishant into the pulverizing unit 1A.
  • the pressure sensor 61 detects the pressure in the housing 31.
  • the pressure sensor 61 is particularly easy to detect a change in pressure in the vicinity of the crushing unit 1A.
  • the detection pipe is inclined downward to the inside of the housing 31 so that the pulverized material does not flow into the main body side of the pressure sensor 61.
  • the biomass fuel supplied from the center chute 33 and the finely pulverized material pulverized are stored and exist in a high concentration in a partially lifted state.
  • the high temperature primary air 60 is in contact with the biomass fuel and the pulverized material. Therefore, in the vicinity of the crushing part 1A, the potential for rapid combustion to occur is high.
  • the extinguishant injector 51 is provided with a piping member 56 through which the extinguishant flows, penetrating the internal wall 45, and the distal end of the piping member 56 is provided in the housing 31.
  • the extinguishant can be reliably injected into the space surrounded by the inner wall 45.
  • the pressure sensor 61 may be worn out or damaged due to the finely pulverized material in which the pipe member 56 of the extinguishant injector 51 flows in the annular flow passage 46. Therefore, a protective material with high strength and the like may be installed on the lower surface of the piping member 56.
  • the tip of the pressure sensor 61 is located on the wall of the housing 31.
  • a through hole 66 is provided in a portion of the inner wall 45 opposed to the position of the tip of the pressure sensor 61.
  • the extinguishant injector 52 and the pressure sensor 62 face the vicinity of the classification portion 1 B in the housing 31, for example, the rotary classifier 41 at the upper side of the housing 31 of the mill 1. It is provided at the surface, that is, at the horizontal position of the rotary classifier 41 in the horizontal direction.
  • One extinguishant injector 52 and one pressure sensor 62 may be adjacently provided as a set.
  • the extinguishant injector 51 injects the extinguishant into the classification unit 1B.
  • the pressure sensor 62 detects the pressure in the housing 31.
  • the pressure sensor 62 is particularly easy to detect a change in pressure near the classification portion 1B.
  • the detection pipe is inclined downward toward the inside of the housing 31 so that the pulverized material does not flow into the main body side of the pressure sensor 62.
  • the vicinity of the classification portion 1B in the housing 31 corresponds to the classification branch point of the blown-up pulverized material, and the pulverized material which is going to enter the rotary classifier 41 and the pulverized material repelled by the fins 42 exist. .
  • the flow trajectory of the finely pulverized material is a region in which the flow paths of the finely pulverized material are mixed with each other.
  • the tip of the piping member 57 of the extinguishant injector 52 is provided on the housing 31.
  • the extinguishant can be injected into the space enclosed by the housing 31.
  • One set of the extinguishant injector 51 and the pressure sensor 61, and one set of the extinguishant injector 52 and the pressure sensor 62 are spaced apart in the circumferential direction of the housing 31.
  • the plurality of sets of extinguishant injectors 51 and pressure-sensitive sensors 61 installed in the lower part, and the plurality of sets of extinguishant injectors 52 and pressure-sensitive sensors 62 installed in the upper part are alternately staggered in the circumferential direction of the housing 31 of the mill 1 In other words, both the upper and lower rows are arranged in a staggered manner.
  • each set of the extinguishant injector 51 and the pressure sensor 61, and each set of the extinguishant injector 52 and the pressure sensor 62 are provided at positions separated by equal pitch angles in the circumferential direction.
  • the example is described in a staggered arrangement, the invention is not limited to this example.
  • Extinction agent sprayer 51 with equal pitch angle and zigzag shape by the influence of machines and tools such as cranes, hoists, piping, walk paths, etc. that are attached to housing 31 of mill 1 or installed around mill 1 Also, there may be a case where it is not possible to arrange each set of pressure sensitive sensors 61 or each set of extinguishant injector 52 and pressure sensitive sensors 62. If the extinguishant can be relatively efficiently dispersed inside the housing 31 of the mill 1, for example, as shown in FIGS.
  • each set of the extinguishant injector 51 and the pressure sensor 61, the extinguishant may not be at equal pitch angles or in a staggered arrangement, but may be spaced apart from or close to each other.
  • the number of extinguishant injectors 51, 52 installed may be increased or decreased depending on the volume of the space inside the housing 31 of the mill 1, and may not match the number of installed pressure sensors 61, 62. For this reason, it is not always necessary that the pressure sensor 61 and the extinguishant injector 51 be in one set and / or that the pressure sensor 62 and the extinguishant injector 52 be in one set. .
  • the pressure-sensitive sensor 61 and the pressure-sensitive sensor 62 are alternately arranged above and below the inside of the housing 31, that is, in a staggered manner, and the extinguishant injector 51 and The extinguishant injectors 52 may be alternately disposed above and below the inside of the housing 31, that is, in a staggered manner.
  • a extinguishant injector 53 and a pressure sensor 63 are provided in the feeder 6 which is a raw material supply system.
  • the extinguishant injector 53 injects the extinguishant into the feeder 6.
  • the pressure sensor 63 detects a change in pressure inside the feeder 6. Thereby, the rapid combustion which makes biomass fuel which exists in the feeder 6 a generation origin can be suppressed.
  • the biomass fuel stored in large quantities in the bunker 7 rises in temperature, becomes smoldering (so-called fire kind), falls onto the belt feeder 8 of the feeder 6 as it is, and contacts air, causing rapid combustion
  • the extinguishant injector 53 and the pressure sensor 63 be installed in the feeder 6 because there is a possibility that they will be a source. Further, the extinguishant injector 53 installed in the feeder 6 can also suppress the spread of fire caused by rapid combustion generated and propagated in the housing 31.
  • the extinguishant injector 54 is provided on the upstream side and / or downstream side of the rotary feeder 43 installed in the coal feeding pipe 4 and injects the extinguishant into the coal feeding pipe 4 or into the rotary feeder 43. .
  • the flame generated in the housing 31 due to the rapid combustion may go up the center chute 33 and spread fire to the biomass fuel stored in the rotary feeder 43.
  • the flame generated in the feeder 6 due to the rapid combustion may flow down the feeder 6 and spread fire on the biomass fuel stored in the rotary feeder 43.
  • the extinguishant injector 55 is provided on the coal feeding pipe 9 which is a pulverized material conveyance system, and injects the extinguishant into the coal feeding pipe 9. Since air flows in the coal feeding pipe 9 toward the boiler facility 10, a flame generated in the housing 31 by rapid combustion may flow down the inside of the coal feeding pipe 9. By injecting the fire extinguishing agent into the coal feeding pipe 9, it is possible to suppress the spread of fire caused by the rapid combustion generated and propagated in the housing 31.
  • the pressure sensors 61, 62, 63 detect a pressure increase when the biomass fuel is ignited in the mill 1 or in the feeder 6 to cause rapid combustion. Signals related to pressure values detected by the pressure sensors 61, 62, 63 are transmitted to a control unit (not shown). In the control unit, based on the pressure values detected by the pressure sensors 61, 62, 63 (according to whether the detected pressure value exceeds the predetermined threshold or more), it is determined whether or not rapid combustion has occurred. The operation of the extinguishant injectors 51 to 55 is controlled based on the judgment result.
  • the control unit It is determined that abnormal pressure is generated due to rapid combustion, and it is determined that rapid combustion has occurred.
  • the extinguishant injection is simultaneously and simultaneously performed in all the six extinguishant injectors 51-55. That is, the extinguishant is injected not only from the extinguishant injectors 51 and 52 adjacent to the pressure sensors 61 and 62 exceeding the predetermined threshold value but also from all the extinguishant injectors 51 to 55.
  • the fire extinguishing agent is injected not only to the rapid combustion source but also to a place where rapid combustion is likely to be transmitted, so that it is possible to reduce enormous damage to the mill 1.
  • the extinguishant need not necessarily be injected in all the six extinguishant injectors 51 to 55, and the extinguishant injectors 51 and 52 installed at least in the mill 1 inject the extinguishant. You may.
  • the control unit determines that an abnormal pressure is generated due to the rapid combustion, and determines that the rapid combustion is generated.
  • the extinguishant injection is simultaneously and simultaneously performed in all the six extinguishant injectors 51-55.
  • the fire extinguishing agent is injected not only to the rapid combustion source but also to a place where rapid combustion is likely to be transmitted, so that it is possible to reduce enormous damage to the mill 1.
  • the extinguishant may not necessarily be injected in all the six extinguishant injectors 51 to 55, and the extinguishant may be injected at least in the extinguishant injector 53 installed in the feeder 6. It may be
  • the predetermined threshold value is a pressure value immediately before rapid combustion occurs, and when the pressure sensors 61, 62, 63 exceed the predetermined threshold, it is determined that rapid combustion occurs just before the fire extinguishing agent is You may inject. In this case, although the rapid combustion may not occur due to the continuation of the operation, the occurrence of the rapid combustion can be prevented by detecting the abnormal pressure.
  • the control unit instantaneously stops the operation of the mill 1 when the extinguishant injection is performed by the extinguishant injectors 51 to 55.
  • the supply of primary air, the supply of biomass fuel, the operation of the pulverizing rotary table 35, the operation of the rotary classifier 41, the stopping of conveyance of pulverized material, and all other mills 1 and mills Both the case where all the machines related to the equipment are stopped and the case where only a part of them is stopped can be considered.
  • the control unit is configured of, for example, a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a computer readable storage medium, and the like. Then, a series of processes for realizing various functions are stored in the form of a program, for example, in a storage medium or the like in the form of a program, and the CPU reads this program into a RAM or the like to execute information processing and arithmetic processing. Thus, various functions are realized.
  • the program may be installed in advance in a ROM or other storage medium, may be provided as stored in a computer-readable storage medium, or may be distributed via a wired or wireless communication means. Etc. may be applied.
  • the computer readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory or the like.
  • pressure sensors 61, 62, and 63 for detecting abnormal pressure are provided at places where ignition may be a cause of rapid combustion, and places where there is a risk of propagation of an ignition cause and rapid combustion.
  • a fire extinguisher injector 51, 52, 53, 54, 55 is provided. According to the present embodiment, not only the mill 1 but also the raw material supply system and the pulverized material discharge system of the mill equipment can totally suppress or prevent the occurrence of rapid combustion and flame propagation.
  • wood-based biomass fuel has come to be used as a raw material (fuel) in thermal power plants, and even large-scale thermal power plants have come to use biomass fuel alone or to study its use. . Therefore, there is an increasing need to grind woody biomass fuel even with a large-sized mill 1, and a high-level technology is required to suppress rapid combustion from occurrence to flame propagation. According to this embodiment, it is possible to meet these requirements.
  • the mill 1 itself and machines and tools attached to the mill 1 can be safely maintained, and the safety of workers of a power plant or the like where the mill 1 is installed is secured. Furthermore, the above effects expand the types of fuel that can be used in the Mill 1 and thermal power plants. Therefore, the operation range of the thermal power plant will be expanded, and economic effects can be expected.
  • the invention can be applied not only to a new plant but also to the existing mill 1 and the mill installation.
  • the mill 1 to which the present embodiment can be applied is not limited to the type of the embodiment described above, and may be another type of mill.
  • the present invention is applicable to a mill in which the inner wall 45 is not installed and the annular flow passage 46 is not formed between the inner wall 45 and the inner surface of the housing 31.
  • the extinguishant injector 51 and the pressure sensor 61 are located in the lower part of the side surface of the housing 31 of the mill 1 near the crushing portion 1A in the housing 31, for example
  • the point provided between the grinding roller 36 and the pressure arm 37 in the direction is similar.
  • the tip of the extinguishant injector 51 is provided in the housing 31.
  • the potential for rapid combustion to occur is high.
  • the fire extinguishing agent is injected in the vicinity of the pulverizing unit 1A, so that it is possible to suppress the rapid combustion with the vicinity of the crushing unit 1A as a generation source and the spread of fire due to the propagated rapid combustion.
  • the bracket 38 is supported by the pressure arm 37, and the crushing roller 36 is pivotable relative to the pressure arm 37 by the bracket 38.
  • the present invention is not limited to this. It is not limited to.
  • the crushing roller may be swingably supported by a support member directly installed in a cantilever manner directly on the housing 31 without the pressure arm 37 or the bracket 38 installed.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Feeding And Controlling Fuel (AREA)
PCT/JP2018/031289 2017-08-25 2018-08-24 粉砕機及びその運用方法 WO2019039579A1 (ja)

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KR1020207003418A KR102403109B1 (ko) 2017-08-25 2018-08-24 분쇄기 및 그 운용 방법
CN201880053796.3A CN111050917B (zh) 2017-08-25 2018-08-24 粉碎机及其运用方法
PH12020500208A PH12020500208A1 (en) 2017-08-25 2020-01-28 Pulverizer and method for operating same

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JP2017162572A JP6827894B2 (ja) 2017-08-25 2017-08-25 粉砕機及びその運用方法

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CN115746932A (zh) * 2023-01-09 2023-03-07 羚羊环保科技有限公司 一种褐煤烘干提质及制粉生产工艺

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CN111050917B (zh) 2021-08-10
TWI682130B (zh) 2020-01-11
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CN111050917A (zh) 2020-04-21
KR102403109B1 (ko) 2022-05-30
JP2019037940A (ja) 2019-03-14
JP6827894B2 (ja) 2021-02-10
PH12020500208A1 (en) 2020-10-12

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