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WO2011142368A1 - Procédé pour la prévention d'inflammation et dispositif pour la prévention d'inflammation dans un pulvérisateur - Google Patents

Procédé pour la prévention d'inflammation et dispositif pour la prévention d'inflammation dans un pulvérisateur Download PDF

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Publication number
WO2011142368A1
WO2011142368A1 PCT/JP2011/060786 JP2011060786W WO2011142368A1 WO 2011142368 A1 WO2011142368 A1 WO 2011142368A1 JP 2011060786 W JP2011060786 W JP 2011060786W WO 2011142368 A1 WO2011142368 A1 WO 2011142368A1
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WO
WIPO (PCT)
Prior art keywords
pulverizer
gas
partial pressure
air
ignition
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2011/060786
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English (en)
Japanese (ja)
Inventor
勝哉 秋山
海洋 朴
陽司 田窪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to CN201180022967.4A priority Critical patent/CN102884377B/zh
Priority to KR1020127029632A priority patent/KR20130009843A/ko
Publication of WO2011142368A1 publication Critical patent/WO2011142368A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F23K2201/1006—Mills adapted for use with furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/10—Supply line fittings
    • F23K2203/102—Flashback safety, e.g. inertizing devices

Definitions

  • the present invention relates to an ignition prevention method and an ignition prevention device for a pulverizer that pulverizes a solid fuel as a boiler fuel.
  • the solid fuel pulverized by the pulverizer is supplied to the boiler using the solid fuel together with the air for conveyance.
  • bituminous coal which has a high ignition temperature
  • boiler fuel so much attention has not been paid to ignition in a pulverizer.
  • some of the early pulverized coal combustion boilers are provided with a system for supplying an inert gas (such as water vapor) and a rupture disk (rupture disk) as a countermeasure after a fire has occurred.
  • an inert gas such as water vapor
  • a rupture disk rupture disk
  • biomass is quantitatively supplied to a coal supply pipe that supplies coal to a pulverizing mill for pulverizing coal, thereby stabilizing the ratio of the amount of coal supplied to the pulverizing mill and the amount of biomass fuel.
  • a coal / organic fuel mixed pulverization apparatus that prevents the ignition of biomass and thus stabilizes the operation state of the pulverization mill is disclosed.
  • Patent Document 2 compares the mill inlet temperature measurement value of the mixed air with the mill inlet temperature set value, and if the mill inlet temperature measured value is equal to or higher than the mill inlet temperature set value, the mill outlet temperature setting A mill device that continues to control the mill outlet temperature while reducing the value while preventing ignition accidents due to excessive rise of the mill inlet temperature and a coal-fired boiler facility equipped with the same are disclosed.
  • Patent Document 3 discloses a roller mill device that controls the mill inlet temperature in accordance with the supply amount of the object to be pulverized, thereby reducing the change in the mill outlet temperature and preventing the pulverized coal from igniting. ing.
  • Patent Document 4 the temperature in the heated air pipe and the coal pulverizer is measured, and the temperature and the supply amount of the air supplied to the coal pulverizer are controlled to eliminate the possibility of ignition.
  • a temperature control device is disclosed.
  • the raw coal moisture is obtained from the mill inlet temperature and the amount of coal supplied to the mill, and the mill outlet temperature is set to the raw coal moisture by setting the mill outlet temperature according to the raw coal moisture.
  • a mill outlet temperature control method that prevents ignition is disclosed.
  • Patent Document 6 discloses a pulverized coal that prevents a pulverized explosion by switching a carrier of pulverized coal from air to an inert gas when a smoldering or smoldering combustion state of pulverized coal is detected in a pulverized bottle. A combustion method is disclosed.
  • Japanese Unexamined Patent Publication No. 2004-347241 Japanese Unexamined Patent Publication No. 2006-102666 Japanese Laid-Open Patent Publication No. 4-244246 Japanese Unexamined Patent Publication No. 56-152750 Japanese Unexamined Patent Publication No. Sho 63-315158 Japanese Unexamined Patent Publication No. 63-267814
  • An object of the present invention is to provide an ignition prevention method and an ignition prevention device for a pulverizer that can prevent ignition in the pulverizer.
  • the method for preventing ignition of a pulverizer according to the present invention is a method for preventing ignition of a pulverizer that pulverizes solid fuel, and supplies air and a gas having a lower oxygen partial pressure than the air as a mixed gas to the pulverizer. , Measuring the carbon monoxide concentration and the oxygen concentration in the gas at the outlet of the pulverizer, respectively, based on the measurement result of the carbon monoxide concentration and the oxygen partial pressure calculated from the measured oxygen concentration, A supply amount of a gas having a lower oxygen partial pressure than that of the air supplied to the pulverizer is adjusted so as to change the oxygen partial pressure in the mixed gas supplied to the pulverizer.
  • the lower the oxygen partial pressure in the mixed gas supplied to the pulverizer the higher the ignition temperature of the solid fuel. This is considered to be because as the oxygen partial pressure in the mixed gas supplied to the pulverizer is lower, the solid fuel is less likely to be oxidized and less likely to ignite. Therefore, if the supply amount of the gas having a lower oxygen partial pressure than the air supplied to the pulverizer is adjusted so that the oxygen partial pressure in the mixed gas supplied to the pulverizer becomes lower, the gas was supplied to the pulverizer. The ignition temperature of the solid fuel becomes high, and the oxidation reaction of the fuel, which is a sign of ignition, hardly occurs in the pulverizer.
  • the concentration of carbon monoxide in the gas at the outlet of the pulverizer if even a small amount of carbon monoxide is detected, an oxidation reaction of fuel, which is a precursor of ignition, has occurred.
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer becomes lower, that is, the ignition temperature of the solid fuel becomes higher than the air supplied to the pulverizer.
  • Adjust the gas supply amount with low oxygen partial pressure Specifically, the ignition temperature of the solid fuel is increased by increasing the supply amount of the gas whose oxygen partial pressure is lower than that of air.
  • the fuel oxidation reaction which is a sign of ignition, does not occur in the pulverizer, and carbon monoxide is not detected in the gas at the outlet of the pulverizer. Therefore, even if solid fuel having a low ignition temperature is used, ignition in the pulverizer can be prevented, and disasters such as fire and explosion of the pulverizer can be prevented.
  • the solid fuel may be at least one of coal and biomass fuel.
  • low cost and low ignition temperature coal and biomass fuel can be used in place of high grade coal such as bituminous coal with high ignition temperature and low cost while preventing ignition in the crusher. Can be achieved.
  • the gas having a lower oxygen partial pressure than air may be at least one of nitrogen gas, carbon dioxide gas, water vapor, and combustion exhaust gas.
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer is suitably changed by supplying at least one of nitrogen gas, carbon dioxide gas, water vapor, and combustion exhaust gas to the pulverizer. Can be made.
  • the ignition preventing device for a pulverizer is an ignition preventing device for a pulverizer for pulverizing solid fuel, the air supply means for supplying air to the pulverizer, and the mixed gas mixed with the air.
  • Gas supply means for supplying a gas having a lower oxygen partial pressure than the air to the pulverizer so as to be supplied to the pulverizer, and a gas supply having a lower oxygen partial pressure than the air supplied to the pulverizer
  • Gas supply amount adjusting means for adjusting the amount, carbon monoxide concentration measuring means for measuring the carbon monoxide concentration in the gas at the outlet of the pulverizer, and oxygen for measuring the oxygen concentration in the gas at the outlet of the pulverizer
  • the mixture supplied to the pulverizer based on the concentration measurement means, the measurement result of the carbon monoxide concentration measurement means, and the oxygen partial pressure calculated from the oxygen concentration measured by the oxygen concentration measurement means Ga As varying the oxygen partial pressure in, and having a control means for controlling the gas supply amount adjusting means.
  • the supply amount of the gas having a lower oxygen partial pressure than the air supplied to the pulverizer is set so that the oxygen partial pressure in the mixed gas supplied to the pulverizer becomes lower. If adjusted, the ignition temperature of the solid fuel supplied to the pulverizer becomes high, and the oxidation reaction of the fuel, which is a sign of ignition, hardly occurs in the pulverizer.
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer becomes lower, that is, the ignition temperature of the solid fuel becomes higher than the air supplied to the pulverizer.
  • Adjust the gas supply amount with low oxygen partial pressure Specifically, the ignition temperature of the solid fuel is increased by increasing the supply amount of the gas whose oxygen partial pressure is lower than that of air.
  • the fuel oxidation reaction which is a sign of ignition, does not occur in the pulverizer, and carbon monoxide is not detected in the gas at the outlet of the pulverizer. Therefore, even if solid fuel having a low ignition temperature is used, ignition in the pulverizer can be prevented, and disasters such as fire and explosion of the pulverizer can be prevented.
  • the solid fuel may be at least one of coal and biomass fuel.
  • low cost and low ignition temperature coal and biomass fuel can be used in place of high grade coal such as bituminous coal with high ignition temperature and low cost while preventing ignition in the crusher. Can be achieved.
  • the gas having a lower oxygen partial pressure than air may be at least one of nitrogen gas, carbon dioxide gas, water vapor, and combustion exhaust gas.
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer is suitably changed by supplying at least one of nitrogen gas, carbon dioxide gas, water vapor, and combustion exhaust gas to the pulverizer. Can be made.
  • the ignition prevention method and the ignition prevention device of the pulverizer of the present invention as a result of measuring the carbon monoxide concentration in the gas at the outlet of the pulverizer, if even a little carbon monoxide is detected, the measured oxygen concentration
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer is lower than the air supplied to the pulverizer so that the ignition temperature of the solid fuel is higher. Adjust the gas supply amount with low partial pressure.
  • the fuel oxidation reaction which is a precursor to ignition, does not occur in the pulverizer, so even if solid fuel with a low ignition temperature is used, ignition in the pulverizer is prevented and disasters such as fire and explosion of the pulverizer are prevented. Can be prevented.
  • coal as the solid fuel
  • the solid fuel is not limited to this, and may be biomass fuel, sludge carbide, or the like, and coal, biomass fuel, sludge carbide, etc. More than one species may be used.
  • the pulverizer ignition prevention device 10 includes an air supply device (air supply means) 12 that supplies air for conveyance (air) to the pulverizer 5, and an oxygen partial pressure higher than that of air.
  • air supply means 12 that supplies air for conveyance (air) to the pulverizer 5, and an oxygen partial pressure higher than that of air.
  • Gas supply device (gas supply means) 13 for supplying a low gas to the pulverizer 5, an air supply amount adjusting device 14 for adjusting the supply amount of air supplied to the pulverizer 5, and the pulverizer 5
  • a gas supply amount adjusting device (gas supply amount adjusting means) 15 for adjusting a supply amount of a gas having a lower oxygen partial pressure than air, and a carbon monoxide concentration for measuring a carbon monoxide concentration in the gas at the outlet of the pulverizer 5 Measuring device (carbon monoxide concentration measuring means) 7, oxygen concentration measuring device (oxygen concentration measuring means) 6 for measuring the oxygen concentration in the gas at the outlet of the pulverizer 5, air supply amount adjusting device 14 and gas supply amount Control each adjustment device 15 Calculator has a (control means) 11, a.
  • Coal hoppers 1 and 2 hold two types of coal A and B, respectively.
  • the mixer 4 mixes two types of coal A and B supplied from the coal hoppers 1 and 2.
  • the supply amount of coal A supplied from the coal hopper 1 to the mixer 4 is adjusted by the coal supply amount adjusting device 3a, and the supply amount of coal B supplied from the coal hopper 2 to the mixer 4 is adjusted by the coal supply amount adjustment. It is adjusted by the device 3b.
  • the pulverizer 5 pulverizes the mixed charcoal mixed in the mixer 4 into pulverized coal.
  • the pulverizer 5 is supplied with transfer air (hot air) for transferring pulverized coal from the air supply device 12.
  • transfer air hot air
  • the pulverized coal in the pulverizer 5 is conveyed to the pulverized coal burner 8 while being dried.
  • the temperature of the conveying air (hot air) at the inlet of the pulverizer 5 is set to 200 ° C. or less.
  • a gas having a lower oxygen partial pressure than air is supplied from the gas supply device 13 to the pulverizer 5.
  • the gas having a lower oxygen partial pressure than air is at least one of nitrogen gas, carbon dioxide gas, water vapor, and combustion exhaust gas.
  • the conveying air from the air supply device 12 and the gas having a lower oxygen partial pressure than the air from the gas supply device 13 are supplied to the pulverizer 5 as a mixed gas in which both are mixed.
  • the carbon monoxide concentration in the gas at the outlet of the pulverizer 5 is measured by the carbon monoxide concentration measuring device 7.
  • the oxygen concentration in the gas at the outlet of the pulverizer 5 is measured by the oxygen concentration measuring device 6.
  • the pulverized coal burner 8 burns pulverized coal.
  • the boiler 9 recovers heat by burning pulverized coal.
  • the heated fuel may ignite in the pulverizer 5.
  • the carbon monoxide concentration measuring device 7 detects carbon monoxide. Therefore, in order to prevent ignition in the pulverizer 5, it is necessary to prevent the oxidation reaction of fuel, which is a sign of ignition, from occurring in the pulverizer 5, that is, in the gas at the outlet of the pulverizer 5. It is necessary to prevent carbon oxide from being detected.
  • the calculator 11 includes the measurement data (measurement result) of the carbon monoxide concentration in the gas at the outlet of the pulverizer 5 measured by the carbon monoxide concentration measuring device 7 and the pulverizer 5 measured by the oxygen concentration measuring device 6. Measurement data (measurement result) of the oxygen concentration in the gas at the outlet is input. The calculator 11 calculates the oxygen partial pressure from the measurement data of the oxygen concentration. The computing unit 11 uses the oxygen partial pressure as a parameter, and based on the measurement data from the carbon monoxide concentration measuring device 7 and the oxygen partial pressure calculated from the oxygen concentration measured by the oxygen concentration measuring device 6, The air supply amount adjusting device 14 and the gas supply amount adjusting device 15 are respectively controlled so as to change the oxygen partial pressure in the mixed gas supplied to the pulverizer 5. Thereby, the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is changed.
  • the ignition temperature of the mixed coal (pulverized coal pulverized by the pulverizer 5) supplied to the pulverizer 5 becomes high, and the oxidation reaction of fuel, which is a sign of ignition, hardly occurs in the pulverizer 5.
  • the two types of coal A and B supplied from the coal hoppers 1 and 2 are mixed by the mixer 4 and supplied to the pulverizer 5 as mixed coal.
  • the supply amount of coal A supplied from the coal hopper 1 to the mixer 4 is adjusted by the coal supply amount adjusting device 3a, and the supply amount of coal B supplied from the coal hopper 2 to the mixer 4 is adjusted to the coal supply amount. It is adjusted by the device 3b.
  • the mixed coal is pulverized by the pulverizer 5 into pulverized coal, and is conveyed to the pulverized coal burner 8 while being dried by the conveying air.
  • the pulverized coal is burned by the pulverized coal burner 8, and the heat generated by the combustion is recovered in the boiler 9.
  • the carbon monoxide concentration in the gas at the outlet of the pulverizer 5 is measured by the carbon monoxide concentration measuring device 7.
  • the oxygen concentration in the gas at the outlet of the pulverizer 5 is measured by the oxygen concentration measuring device 6.
  • the concentration measurement data (measurement result) is input to the calculator 11.
  • the calculator 11 calculates the oxygen partial pressure from the measurement data of the oxygen concentration.
  • the computing unit 11 uses oxygen partial pressure as a parameter, and oxygen in the mixed gas supplied to the pulverizer 5 based on the measurement data from the carbon monoxide concentration measuring device 7 and the calculated oxygen partial pressure.
  • the air supply amount adjusting device 14 and the gas supply amount adjusting device 15 are controlled so as to change the partial pressure. Thereby, the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is changed.
  • the computing unit 11 causes the pulverizer 5 to reduce the oxygen partial pressure in the mixed gas supplied to the pulverizer 5, that is, the ignition temperature of the pulverized coal increases.
  • the supply amount of the supply air to be supplied and the gas having a lower oxygen partial pressure than the air are adjusted. Specifically, the ignition temperature of pulverized coal is raised by relatively increasing the supply amount of gas having a lower oxygen partial pressure than air.
  • biomass fuel may be used as the solid fuel. And, by using low-cost coal and biomass fuel with low ignition temperature instead of high-grade coal such as expensive bituminous coal with high ignition temperature, it is possible to reduce costs while preventing ignition in the crusher 5. Can do.
  • the mixed gas supplied to the pulverizer 5 can be suitably changed.
  • a part of the exhaust gas from the boiler 9 may be used as the gas having a lower oxygen partial pressure than air.
  • the threshold value is a carbon monoxide concentration when the fuel (pulverized coal) is ignited in the pulverizer 5 and is several tens of ppm.
  • the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is lowered, that is, the ignition temperature of pulverized coal. Is adjusted so that the supply air supplied to the pulverizer 5 and the supply amount of gas having a lower oxygen partial pressure than air are adjusted.
  • the supply air supplied to the pulverizer 5 and the supply amount of the gas having a lower oxygen partial pressure than the air are not changed.
  • the pulverizer 5 is set so that the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 increases, that is, the ignition temperature of the pulverized coal decreases.
  • the supply amount of the carrier air supplied to the gas and the supply amount of the gas having a lower oxygen partial pressure than the air may be adjusted.
  • the pulverized coal ignition test apparatus 21 includes a cylindrical vertical reaction tube 22 having an inner diameter of ⁇ 25 mm ⁇ 700 L, a pulverized coal feeder 23 for supplying a predetermined amount of pulverized coal into the cylindrical vertical reaction tube 22, and an outer periphery of the cylindrical vertical reaction tube 22.
  • a carbon monoxide concentration meter 26 provided at the lower part of the reaction tube 22 and a rupture disk 29 provided above the cylindrical vertical reaction tube 22 are provided.
  • the atmospheric temperature inside the cylindrical vertical reaction tube 22 can be raised by the heater 24 from room temperature to about 400 ° C. along the vertical direction of the cylindrical vertical reaction tube 22 almost uniformly.
  • the temperature increase rate of the atmospheric temperature inside the cylindrical vertical reaction tube 22 is adjusted to about 5 ° C./min.
  • thermocouple insertion ports are provided at eight locations along the longitudinal direction on the side surface of the cylindrical vertical reaction tube 22, and sheath K thermocouples 28 having an outer diameter of 1 mm are respectively connected to these thermocouple insertion ports. Inserted. These sheath K thermocouples 28 enable measurement of the ambient temperature on the central axis inside the cylindrical vertical reaction tube 22.
  • the gas supply line 25 includes a mixing chamber 31 that mixes nitrogen gas (a gas having a lower oxygen partial pressure than air) and air to form a mixed gas, an oxygen concentration meter 32 that measures the oxygen concentration in the mixed gas, And a heater 33 for heating the mixed gas.
  • the rupture disk 29 is normally closed, and is opened when the inside of the cylindrical vertical reaction tube 22 becomes high pressure.
  • test conditions pulverized coal whose water content was adjusted in the range of 4.0 to 5.0% in advance was used as test conditions.
  • the proportion of pulverized coal having a particle size of 75 ⁇ m or less was set to 80% or more.
  • the Air / Coal ratio ratio of the amount [L / min] of the heated mixed gas supplied to the cylindrical vertical reaction tube 22 and the amount [g / min] of coal supply
  • a residence time in which the pulverized coal stayed in the cylindrical vertical reaction tube 22 was set to about 6 seconds.
  • the pulverized coal particles move in the cylindrical vertical reaction tube 22 at the same speed as the mixed gas.
  • the pulverized coal did not adhere to the inside of the pulverizer 5 and stayed there.
  • Quantitative pulverized coal supplied from the pulverized coal feeder is dropped into the cylindrical vertical reaction tube 22 by its own weight.
  • a heated mixed gas is supplied from the gas supply line 25 into the cylindrical vertical reaction tube 22.
  • the pulverized coal and the mixed gas are heated to the same temperature. Thereafter, the pulverized coal falls out of the system from the lower flange portion 22 a of the cylindrical vertical reaction tube 22 and is stored in the receiving container 27.
  • the carbon monoxide concentration meter 26 installed at the lower portion of the cylindrical vertical reaction tube 22 is increased. Detects an increase in carbon oxide concentration. While changing the oxygen partial pressure of the mixed gas supplied into the cylindrical vertical reaction tube 22 and changing the atmospheric temperature in the cylindrical vertical reaction tube 22 with the heater 24, repeated tests were performed to obtain a cylindrical vertical reaction tube. The average value of the atmospheric temperature in the cylindrical vertical reaction tube 22 at the time when the carbon monoxide concentration in the gas at the outlet of 22 became 30 ppm or more was calculated as the ignition temperature of the pulverized coal.
  • the measurement result of the ignition temperature of pulverized coal using the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 as a parameter is shown in FIG. From the measurement result of the ignition temperature of the pulverized coal, it can be seen that the ignition temperature of the pulverized coal increases linearly as the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 decreases. This is considered to be because the pulverized coal is less likely to be oxidized and less likely to ignite as the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is lower. Therefore, controlling the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is considered to be an operating condition for safely operating the pulverizer 5 from the viewpoint of ignition in the pulverizer 5.
  • the temperature of the conveying air (hot air) at the inlet of the pulverizer 5 is preferably 200 ° C. or less. .
  • control of the air supply amount adjusting device 14 and the gas supply amount adjusting device 15 by the computing unit 11 is not limited to the above. Even if the carbon monoxide concentration measuring device 7 does not detect carbon monoxide, the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 is reduced, that is, the ignition temperature of the solid fuel is increased.
  • the supply air supplied to the machine 5 and the supply amount of the gas having a lower oxygen partial pressure than air may be adjusted, respectively, or even if the carbon monoxide concentration measuring device 7 detects carbon monoxide, the value Is less than the threshold value, the oxygen partial pressure in the mixed gas supplied to the pulverizer 5 increases, that is, the carrier air and air supplied to the pulverizer 5 so that the ignition temperature of the solid fuel decreases.
  • the supply amount of the gas having a lower oxygen partial pressure may be adjusted. In short, as long as ignition does not occur in the pulverizer 5, the supply air supplied to the pulverizer 5 and the supply amount of gas having a lower oxygen partial pressure than air may be adjusted.
  • the calculator 11 controls the air supply amount adjusting device 14 that adjusts the supply amount of the conveying air supplied from the air supply device 12 to the pulverizer 5, but the calculator 11 is configured to control the air supply amount.
  • the structure which does not control the adjustment apparatus 14 may be sufficient.
  • the present invention is useful for preventing ignition of a solid fuel pulverizer in a boiler.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Le dispositif ci-décrit comprend : un moyen d'alimentation d'air (12) qui fournit de l'air ; un moyen d'alimentation de gaz (13) qui fournit un gaz dans lequel la pression partielle d'oxygène est inférieure à celle de l'air ; un moyen de réglage de la quantité d'alimentation de gaz (15) qui règle la quantité de gaz fourni ; un moyen de mesure de la concentration de monoxyde de carbone (7) et un moyen de mesure de concentration d'oxygène (6) qui mesurent respectivement la concentration de monoxyde de carbone et la concentration d'oxygène au niveau de la sortie d'un pulvérisateur (5) qui est destiné à la pulvérisation de combustible solide et dont l'alimentation d'air et de gaz s'effectue sous forme de gaz mixte ; et un moyen de régulation (11) qui contrôle le moyen de réglage de la quantité d'alimentation de gaz (15) sur la base des résultats de mesure du moyen de mesure de la concentration de monoxyde de carbone (7) et du moyen de mesure de concentration d'oxygène (6) de manière à changer la pression partielle de l'oxygène dans le gaz mixte qui alimente le pulvérisateur (5). Grâce à cet agencement, il est possible d'éviter l'inflammation à l'intérieur du pulvérisateur (5).
PCT/JP2011/060786 2010-05-14 2011-05-10 Procédé pour la prévention d'inflammation et dispositif pour la prévention d'inflammation dans un pulvérisateur Ceased WO2011142368A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180022967.4A CN102884377B (zh) 2010-05-14 2011-05-10 粉碎机的起火防止方法及起火防止装置
KR1020127029632A KR20130009843A (ko) 2010-05-14 2011-05-10 분쇄기의 발화 방지 방법 및 발화 방지 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010112059A JP5385849B2 (ja) 2010-05-14 2010-05-14 粉砕機の発火防止方法及び発火防止装置
JP2010-112059 2010-05-14

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WO2011142368A1 true WO2011142368A1 (fr) 2011-11-17

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KR (1) KR20130009843A (fr)
CN (1) CN102884377B (fr)
WO (1) WO2011142368A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013166179A1 (fr) * 2012-05-01 2013-11-07 Innovative Combustion Technologies, Inc. Système de protection de broyeur pulvérisateur
CN104049563A (zh) * 2013-03-15 2014-09-17 阿尔斯通技术有限公司 粉碎机监测
US9604226B2 (en) 2012-05-01 2017-03-28 Innovative Combustion Technologies, Inc. Pulverizer mill protection system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
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JP5949414B2 (ja) * 2012-10-05 2016-07-06 新日鐵住金株式会社 粉砕プラント排ガス制御装置、粉砕プラント排ガス制御方法、及びコンピュータプログラム
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