WO2013146599A1 - 加圧流動炉システムの非常停止方法 - Google Patents

加圧流動炉システムの非常停止方法 Download PDF

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Publication number
WO2013146599A1
WO2013146599A1 PCT/JP2013/058330 JP2013058330W WO2013146599A1 WO 2013146599 A1 WO2013146599 A1 WO 2013146599A1 JP 2013058330 W JP2013058330 W JP 2013058330W WO 2013146599 A1 WO2013146599 A1 WO 2013146599A1
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WO
WIPO (PCT)
Prior art keywords
combustion
air supply
pressurized fluidized
furnace
fluidized furnace
Prior art date
Application number
PCT/JP2013/058330
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English (en)
French (fr)
Japanese (ja)
Inventor
隆文 山本
和由 寺腰
邦彦 古閑
敢 折戸
Original Assignee
月島機械株式会社
三機工業株式会社
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Filing date
Publication date
Application filed by 月島機械株式会社, 三機工業株式会社 filed Critical 月島機械株式会社
Priority to KR1020147027672A priority Critical patent/KR102067303B1/ko
Priority to CN201380013626.XA priority patent/CN104220810B/zh
Publication of WO2013146599A1 publication Critical patent/WO2013146599A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • 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
    • F23L15/00—Heating of air supplied for combustion
    • 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
    • F23L5/00—Blast-producing apparatus before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F23G2207/102—Arrangement of sensing devices for pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/30—Oxidant supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2208/00—Safety aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/18—Controlling fluidized bed burners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • the present invention relates to an emergency stop method for a pressurized flow furnace system that burns an object to be treated such as sewage sludge, biomass, and municipal waste, and more specifically, suppresses malfunction due to surge of a compressor of a turbocharger.
  • the present invention relates to an emergency stop method for a pressurized fluidized furnace system that suppresses the generation of harmful substances by completely burning an object to be processed remaining in the pressurized fluidized furnace.
  • a pressurized fluidized furnace system has been known as an incineration facility that focuses on effectively taking out the energy of combustion exhaust gas discharged from an incinerator by burning an object to be treated such as sewage sludge, biomass, and municipal waste.
  • the pressurized fluidized furnace system is a pressurized fluidized furnace that combusts a workpiece, a turbine that is rotated by combustion exhaust gas discharged from the pressurized fluidized furnace, and is rotated as the turbine rotates to supply compressed air. It is the system characterized by having the supercharger which mounts the compressor which carries out.
  • the turbine of the turbocharger is driven by combustion exhaust gas generated when the workpiece is completely burned, and the combustion air necessary for burning the workpiece is compressed by the compressed air discharged from the compressor.
  • Self-supporting operation that can cover everything is possible. It has been known that the self-sustained operation can eliminate the need for a fluid blower and an attracting fan, which have been conventionally required, and reduce the running cost.
  • This pressurized fluidized furnace is normally operated at a furnace pressure of about 150 kPa, but in order to avoid equipment damage if the furnace pressure rises above the set value due to the unnecessary operation of equipment during operation. It was necessary to quickly reduce the pressure in the system.
  • the pressurized fluidizing furnace is opened when the compressed air supplied to the pressurized fluidizing furnace is released to the atmosphere in order to reduce the pressure in the pressurized fluidizing furnace.
  • the pressure in the flow path for supplying combustion air to the air drops.
  • the gas in the furnace flows back through the pipe from the dispersion pipe that originally supplies the combustion air into the pressurized fluidized furnace, and flows back together with the gas in the furnace. There was a risk that the fluidized sand clogged the dispersion pipes and piping.
  • the main problem of the present invention is to eliminate such problems.
  • the first invention is a workpiece having a starting burner for heating the fluidized sand filled in the bottom, an auxiliary fuel combustion device to which auxiliary air is supplied via an auxiliary air supply channel, and a combustion air supply pipe.
  • a pressurized fluidizing furnace that combusts the gas
  • a pressure measuring device that measures the pressure of the pressurized fluidized furnace
  • a turbine that is rotated by the combustion exhaust gas discharged from the pressurized fluidized furnace, and a rotation as the turbine rotates.
  • a supercharger that includes a compressor that supplies combustion air to each of the starting burner and the combustion air supply pipe of the pressurized fluidized furnace via a flow path, and combustion exhaust gas discharged from the pressurized fluidized furnace
  • An emergency stop method for a pressurized fluidized furnace system comprising an air preheater for heating combustion air supplied from the supercharger, When a pressure measurement value by the pressure measurement device exceeds a set value, at least one of an auxiliary air supply flow path connected to the auxiliary fuel combustion apparatus or a flow path connecting the combustion air supply pipe and the compressor. Compressed air supply stop process to close one, And a compressed air supply starting step of communicating at least one flow path connecting the compressor and the starter burner of the pressurized flow furnace.
  • an atmosphere release step of communicating with an atmosphere release channel that discharges compressed air supplied from the compressor to the outside is provided. It is characterized by including.
  • the third invention is characterized in that, in addition to the configuration of the second invention, the atmosphere release step is performed before the compressed air supply stop step.
  • the blockage of the flow path connecting the combustion air supply pipe and the compressor is connected to the combustion air supply port of the air preheater at one end. And a flow path extending to the compressor is closed.
  • one end is connected to the combustion air supply port of the air preheater and the extending flow path is closed, so that the relatively low temperature combustion air is brought into contact with the gate valve and heated by the high temperature combustion exhaust gas.
  • the flow path can be closed without being affected by the combustion air, and the durability of the gate valve and the like can be improved.
  • the fifth invention is characterized in that, in addition to the configuration of the first invention, in the compressed air supply start step, one end is connected to the combustion air supply port of the start burner and the extending flow path is communicated.
  • the pressure measuring device is provided in a flow path connecting a combustion exhaust gas exhaust port of the pressurized fluidized furnace and a combustion exhaust gas supply port of the air preheater. It is characterized by that.
  • the pressure measuring device Since the pressure measuring device is installed in the flow path connecting the combustion exhaust gas exhaust port of the pressurized fluidized furnace and the combustion exhaust gas supply port of the air preheater, the pipe length is not affected by the pressure drop. Pressure fluctuation can be accurately measured.
  • the seventh invention is characterized in that, in addition to the configurations of the first to third inventions, the pressure measuring device is provided in a flow path connected to a downstream side of a combustion exhaust gas discharge port of the air preheater.
  • the pressure measuring device Since the pressure measuring device is installed in the flow path connected downstream of the exhaust gas exhaust port of the air preheater, it is necessary to perform correction calculation of the pressure loss of the air preheater. Since it becomes gas, the durability of the pressure measuring device can be improved without being affected by high-temperature combustion exhaust gas.
  • the pressurized fluidized furnace system 1 includes a storage device 10 that stores an object to be processed such as sludge, a pressurized fluidized furnace 20 that combusts the object to be processed supplied from the storage device 10, An air preheater 40 for heating the combustion air supplied to the pressurized fluidized furnace 20 by the combustion exhaust gas discharged from the pressure fluidized furnace 20, a dust collector 50 for removing dust and the like in the combustion exhaust gas, and pressurization driven by the combustion exhaust gas A supercharger 60 for supplying combustion air to the fluidized furnace 20, a white smoke prevention preheater 70 for heating the white smoke prevention air supplied to the flue gas treatment tower 80 by the combustion exhaust gas discharged from the supercharger 60, and And a flue gas treatment tower 80 for removing impurities in the combustion exhaust gas.
  • a storage device 10 that stores an object to be processed such as sludge
  • a pressurized fluidized furnace 20 that combusts the object to be processed supplied from the storage device 10
  • An air preheater 40
  • the object to be treated stored in the storage device 10 is mainly sewage sludge dehydrated to a moisture content of 70 to 85% by mass, and the object to be treated contains combustible organic matter.
  • a to-be-processed object is a water-containing organic substance, it will not be restrict
  • a fixed amount feeder (supply device) 11 for supplying a predetermined amount of the object to be processed to the pressurized flow furnace 20 is disposed at the lower part of the storage device 10, and the object to be processed is pressurized and flowed downstream of the fixed amount feeder 11.
  • a dosing pump 12 is provided for pressure feeding to the furnace 20.
  • the input pump 12 a single screw pump, a piston pump or the like can be used.
  • the pressurized fluidized furnace 20 is a combustion furnace having a predetermined particle size as a fluidized medium and filled with solid particles such as fluidized sand in the lower part of the furnace, and a fluidized bed (hereinafter referred to as a fluidized bed) by combustion air supplied into the furnace.
  • the material to be processed supplied from the outside and auxiliary fuel supplied as necessary are burned while maintaining the fluid state of the sand layer.
  • an auxiliary fuel combustion device 21 for heating the fluidized sand having a particle size of about 400 to 600 ⁇ m filled in the pressurized fluidized furnace 20 is disposed at the lower part of the side wall on one side.
  • a starting burner 22 that heats the fluidized sand at the time of starting is disposed in a portion in the vicinity of the upper side of the auxiliary fuel combustion device 21, and a workpiece supply port 13 ⁇ / b> B is provided in an upper portion of the starting burner 22.
  • a water gun 23 for cooling the combustion exhaust gas is disposed at the upper part of the pressurized fluidized furnace 20, and cooling water can be sprayed into the furnace as necessary.
  • a combustion air supply pipe 24 for supplying combustion air for supplying oxygen necessary for combustion and kinetic energy for maintaining the fluidized state of the fluidized bed is installed in the furnace under the pressurized fluidized furnace 20. .
  • the combustion air supply pipe 24 may be a dispersion pipe in which a plurality of pipes having a plurality of openings are arranged, or a dispersion plate in which a plurality of openings are provided in a plate-shaped iron plate or the like.
  • the auxiliary fuel combustion device 21 is disposed above the combustion air supply pipe (dispersion pipe) 24 in order to heat the fluidized sand filled in the pressurized fluidized furnace 20.
  • a plurality of auxiliary fuel combustion devices 21 are arranged in parallel, similar to the dispersion pipe used as the combustion air supply pipe 24.
  • Auxiliary fuel such as city gas or heavy oil is supplied to the auxiliary fuel combustion device 21 from an auxiliary fuel supply device 29 installed outside the furnace.
  • the auxiliary fuel combustion apparatus 21 is supplied with compressed air supplied from the air supply means 120 as auxiliary air through a pipe (auxiliary air supply flow path) 121 and an auxiliary air supply valve 121C for controlling the supply of auxiliary air. Is done.
  • the supplied compressed air is used for spraying and combustion of auxiliary fuel, and heats the fluidized sand by supplying it into the furnace together with the auxiliary fuel.
  • an air compressor provided separately as the air supply means 120 may be used, the compressor 62 of the supercharger 60 can also be used as the air supply means 120, and one of the combustion air discharged from the compressor 62 is used.
  • the part can also be supplied as auxiliary air.
  • a gas gun or an oil gun can be used as the auxiliary fuel combustion device 21.
  • the starting burner 22 is disposed so as to fall and incline toward the center of the pressurized fluidized furnace 20 in order to heat the upper surface of the fluidized sand at the time of starting.
  • the starting burner 22 is supplied with auxiliary fuel from the auxiliary fuel supply device 29 outside the furnace and compressed air from the compressor 62 of the supercharger 60. Further, as the combustion air of the start burner 22, the blown air generated by the starter blower 65 through the pipe 96 is used.
  • a combustion air supply pipe 24 for supplying combustion air for supplying oxygen used for fluidization and combustion of the fluidized bed is disposed inside the pressurized fluidized furnace 20 at the lower part of the side wall on the other side of the pressurized fluidized furnace 20. ing. The thinned side wall at the top of the pressurized fluidized furnace 20 is heated with combustion gas generated by the combustion of the auxiliary fuel, the object to be processed, sand filtered water, water existing in the object to be processed, etc.
  • a discharge port 90 ⁇ / b> A is formed for discharging the water vapor generated in step 1 to the outside of the furnace.
  • combustion gas or a gas in which combustion gas and water vapor are mixed is referred to as combustion exhaust gas.
  • the combustion air supply pipe 24 is disposed below the auxiliary fuel combustion device 21 in order to supply combustion air evenly to the auxiliary fuel supplied from the auxiliary fuel combustion device 21.
  • the combustion air supply pipe 24 is provided with a plurality of pipes such as a dispersion pipe or a plate-shaped iron plate in which a plurality of pipes having a plurality of openings are arranged in order to supply combustion oxygen and combustion air as fluidized air into the furnace.
  • a dispersion plate provided with a plurality of openings can be used.
  • a plurality of temperature sensors (not shown) for measuring the in-furnace temperature are installed on the side wall of the pressurized flow furnace 20 at predetermined intervals along the height direction.
  • the installation locations are the sand layer and the freeboard section, which are 2 to 3 places each, 4 to 6 places in total.
  • a thermocouple or the like can be used as the temperature sensor.
  • the free board portion refers to the upper layer portion of the sand layer in the pressurized fluidized bed combustion furnace 11.
  • the pressurized fluidized furnace 20 is also provided with a viewing window (not shown) for confirming the combustion state from the outside.
  • a temperature sensor, a viewing window, and the like are provided with a purge air supply port for avoiding adhesion of fluid sand and contact with combustion exhaust gas. This purge air is supplied from a separately provided air compressor.
  • the air preheater 40 is installed at the rear stage of the pressurized fluidized furnace 20 and indirectly exchanges heat between the combustion exhaust gas discharged from the pressurized fluidized furnace 20 and the combustion air, thereby raising the combustion air to a predetermined temperature. It is a device that warms up. As shown in FIGS. 1 and 3, the air preheater 40 has a combustion exhaust gas supply port 90 ⁇ / b> B from the pressurized fluidized furnace 20 formed at the upper portion of one side wall, and a lower vicinity portion of the supply port 90 ⁇ / b> B. Is formed with a discharge port 91 ⁇ / b> A through which combustion air is discharged from the air preheater 40.
  • the combustion exhaust gas supply port 90B is connected to a discharge port 90A of the pressurized fluidized furnace 20 via a pipe (flow path) 90, and the combustion air discharge port 91A is added via a pipe (flow path) 91. It is connected to the rear part of the combustion air supply pipe 24 of the pressure flow furnace 20.
  • a discharge port 92A for discharging the combustion exhaust gas from the air preheater 40 is formed in the lower part on the other side of the air preheater 40, and a supply port for supplying combustion air into the device in a region near the upper side of the discharge port 92A 95B is formed.
  • the air preheater a shell and tube heat exchanger is preferable.
  • the dust collector 50 is provided in the subsequent stage of the air preheater 40 and is a device that removes impurities such as dust and finely divided fluidized sand contained in the combustion exhaust gas delivered from the air preheater 40.
  • a filter installed in the dust collector 50 for example, a ceramic filter or a bag filter can be used.
  • a supply port 92B for supplying combustion exhaust gas into the device is formed in a lower portion of one side wall.
  • a discharge port 93A for discharging clean combustion exhaust gas from which impurities and the like have been removed to the outside of the device is formed.
  • the combustion exhaust gas supply port 92 ⁇ / b> B is connected to the combustion exhaust gas discharge port 92 ⁇ / b> A of the air preheater 40 through a pipe 92.
  • a vacuum filter (not shown) is provided at a portion between the supply port 92B formed in the lower portion and the discharge port 93A formed in the upper portion in the vertical direction. Impurities and the like in the combustion exhaust gas removed by the filter are temporarily stored at the bottom in the dust collector 50 and then periodically discharged to the outside.
  • the supercharger 60 is provided at the rear stage of the dust collector 50, and is rotated by the turbine 61 rotated by the combustion exhaust gas sent from the dust collector 50, the shaft 63 that transmits the rotation of the turbine 61, and the shaft 63.
  • the compressor 62 generates compressed air by being transmitted.
  • the generated compressed air is supplied to the pressurized fluidized furnace 20 as combustion air.
  • a supply port 93 ⁇ / b> B for supplying clean combustion exhaust gas from which impurities have been removed by the dust collector 50 into the apparatus is formed at a lower portion of the side wall of the turbocharger 60 on the turbine 61 side (a portion orthogonal to the shaft 63).
  • a discharge port 97A for discharging combustion exhaust gas to the outside of the device is formed on the downstream side of the side wall (portion parallel to the shaft 63).
  • a clean combustion exhaust gas supply port 93 ⁇ / b> B is connected to a discharge port 93 ⁇ / b> A of the dust collector 50 through a pipe 93.
  • a supply port 67B for sucking air into the equipment is formed, and above the side wall on the turbine 61 side (perpendicular to the shaft 63).
  • a discharge port 94A for discharging compressed air obtained by increasing the pressure of the sucked air to 0.05 to 0.3 MPa is formed in the device.
  • the outside air supply port 67 ⁇ / b> B sucks air through the pipes 16 and 67. Further, it is also connected to a starter blower 65 that supplies combustion air to the pressurized fluidized furnace 20 at the time of start-up via pipes 66 and 67.
  • the compressed air discharge port 94 ⁇ / b> A is used for starting the pressurized flow furnace 20 via the supply ports 95 ⁇ / b> B of the air preheater 40 through the pipes (flow paths) 94, 95 and the pipes (flow paths) 94, 96. It is connected to the rear part of the burner 22.
  • the starter blower 65 is a device that supplies combustion air to the starter burner 22 and the combustion air supply pipe 24 of the pressurized fluidized furnace 20 when the pressurized fluidized furnace system 1 is started. Further, the starter blower 65 reduces the water vapor generated in the pressurized fluidized furnace 20 due to the interruption of the supply of the object to be processed from the storage device 10, and the rotational speed of the turbine 61 of the supercharger 60 is reduced. Therefore, when the intake of the outside air by the compressor 62 is reduced, it has a function of forcibly supplying the outside air to the compressor 62 via the pipes 66 and 67.
  • the starter blower 65 is connected to the rear portion of the starter burner 22 disposed in the pressurized fluidized furnace 20 via pipes 66, 68, 96, and the combustion air of the air preheater 40 is connected via the pipes 66, 68, 95. Is connected to the supply port 67B of the compressor 62 of the supercharger 60 via pipes 66 and 67.
  • a damper 68C that communicates a part of the pipe 68 that is a bypass flow path far from the connection point with the pipe 67 when viewed from the starter fan 65 is disposed.
  • the damper 68C communicates the pipe 68 from the time when the pressurized fluidized furnace 20 is started (when the starter burner 22 is ignited) until the temperature rise of the pressurized fluidized furnace 20 is completed.
  • the pipe 68 is shut off. That is, from the start of the pressurized fluidized furnace 20 to the completion of the temperature rise of the incinerator, the pressurized fluidized furnace 20 from the starter blower 65 via the starter burner 22 and the air preheater 40 of the pressurized fluidized furnace 20.
  • the combustion air is supplied to the combustion air supply pipe 24, and the combustion air is also supplied to the compressor 62 side of the supercharger 60 through the pipe 67 which is an unclosed air flow path. After that, by closing the damper 68C, the combustion air is supplied from the compressor 62 of the supercharger 60 to the combustion air supply pipe 24 of the pressurized fluidized furnace 20 via the air preheater 40.
  • the white smoke prevention preheater 70 prevents the white smoke of the combustion exhaust gas discharged from the chimney 87 to the outside, and the white smoke prevention supplied from the combustion exhaust gas discharged from the supercharger 60 and the white smoke prevention fan. It is a device that indirectly exchanges heat with industrial air. By the heat exchange treatment, the combustion exhaust gas is cooled and the white smoke prevention air is heated. The flue gas that has been heat-exchanged and cooled by the white smoke prevention preheater 70 is sent to the subsequent flue gas treatment tower 80.
  • a shell and tube heat exchanger, a plate heat exchanger, or the like can be used as the white smoke preventing preheater 70.
  • the flue gas treatment tower 80 is a device that prevents discharge of impurities and the like contained in the combustion exhaust gas outside the equipment, and a chimney 87 is disposed on the upper part of the flue gas treatment tower 80.
  • the flue gas treatment tower 80 has a supply port 98 ⁇ / b> B for supplying the combustion exhaust gas discharged from the white smoke prevention preheater 70 into the apparatus at the lower part of the side wall on one side.
  • a supply port 99B is formed in the lower portion of the side wall on one side of the chimney 87 to supply the white smoke prevention air, which is heated and discharged from the white smoke prevention preheater 70 and exchanged with the exhaust gas, into the chimney 87.
  • the combustion exhaust gas supply port 98B is connected to a combustion exhaust gas discharge port 98A formed in the lower portion of the white smoke prevention preheater 70 via a pipe 98, and the white smoke prevention air supply port 99B is connected to the pipe.
  • 99 is connected to a white smoke prevention air discharge 99 ⁇ / b> A formed in the upper part of the white smoke prevention preheater 70.
  • the white smoke prevention air of the white smoke prevention preheater 70 is supplied to the white smoke prevention preheater 70 via the pipe 103 by the white smoke prevention air blower 101 and indirectly exchanged with the combustion exhaust gas. It is heated and discharged from the discharge port 99A.
  • the combustion exhaust gas at the outlet which tends to be wet and condensed in the air, is mixed with warm and dry white smoke prevention air at the supply port 99B to reduce the relative humidity of the combustion exhaust gas. To prevent white smoke.
  • a spray pipe 84 for spraying water supplied from the outside into the apparatus is arranged on the upper side wall on the other side of the flue gas treatment tower 80, and the intermediate part and the lower part are respectively connected via a circulation pump 83.
  • a spray pipe 85 for spraying caustic soda water containing caustic soda stored at the bottom of the flue gas treatment tower 80 into the apparatus is disposed. Further, the caustic soda water stored in the flue gas processing tower 80 is supplied from a caustic soda tank (not shown) via a caustic soda pump 88 (not shown), and is always maintained at an appropriate amount.
  • the combustion exhaust gas supplied to the flue gas treatment tower 80 is mixed with white smoke prevention air after removing impurities and the like, and is discharged from the chimney 87 to the outside.
  • the emergency stop device includes a warning switch 110C mounted on the pressure sensor 110, a gate valve 95C that controls communication of the pipe 95, a gate valve 96C that controls communication of the pipe 96, and an output state corresponding to the input state. It is comprised by the control apparatus 100 which controls. Note that the pressure sensor 110 is not limited to the one on which the warning switch 110 ⁇ / b> C is mounted, and only needs to output a measurement value to the control device 100.
  • the compressor 62 of the supercharger 60 and the combustion air supply pipe 24 are connected by pipes 91, 94, 96, and 95 through the air preheater 40. Further, the compressor 62 of the supercharger 60 and the starting burner 22 of the pressurized fluidized furnace 20 are connected by pipes 94 and 96.
  • a gate valve 95 ⁇ / b> C that communicates the pipe 95 is arranged in the middle of the pipe 95, and a gate valve that communicates the pipe 96 is arranged in the middle of the pipe 96 (downstream of the branch portion between the pipe 95 and the pipe 96).
  • 96C is arranged.
  • the warning switch 110 ⁇ / b> C is connected to the input side of the control device 100, and gate valves 95 ⁇ / b> C and 96 ⁇ / b> C are connected to the output side of the control device 100.
  • the installation of the pressure sensor 110 is not limited to the pipe 90, and a pipe 92, a pipe 93, a pipe 97, a pipe is added by adding a correction circuit for correcting the pressure loss of the downstream equipment in the control device 100. 98 can also be arranged.
  • the installation of the gate valve 95C is not limited to the pipe 95, and the gate valve 95C can be disposed in the pipe 91 as long as the gate valve 95C can withstand high temperatures. Further, a carbon monoxide concentration meter 98C and an oxygen concentration meter 98D for measuring the capacities of carbon monoxide and oxygen contained in the exhaust gas can be connected to the input side of the control device 100.
  • the pressure in the pressurized fluidized furnace 20 rises to a set value (maximum operable value) or more, the pressure in the piping through which the combustion exhaust gas connected to the downstream side of the pressurized fluidized furnace 20 flows is maintained.
  • the pressure in the pressurized flow furnace 20 is detected by a pressure sensor 110 disposed in the pipe 90 and input to the control device 100 by a warning switch 110C mounted on the pressure sensor (pressure measurement device) 110.
  • the warning switch 20C and the control device 100 are not connected (the pressure in the pressurized flow furnace 20 is higher than the set value), as shown in FIG.
  • the gate valve 95C is closed by a signal from the control device 100, so that the combustion is performed.
  • the air supply pipe 24 and the compressor 96 are shut off (compressed air supply stop process).
  • the auxiliary air supply passage 121 that communicates the air compressor or supercharger 60 that is a supply source and the auxiliary fuel combustion device 21 is shut off.
  • combustion air that connects the compressor 62 of the supercharger 60 and the pressurized fluidized furnace 20 in order to prevent the surge in the supercharger 60 and to burn the workpiece remaining in the pressurized fluidized furnace 20 Communicate the piping through which flows.
  • the gate valve 96C arranged in the pipe 96 communicating with the compressor 62 and the starting burner is opened by the control device 100, and the combustion air is supplied into the pressurized fluidized furnace 20 through the starting burner.
  • compressed air supply start step The combustion air supplied from the compressor 62 to the pressurized fluidized furnace 20 is supplied to the pressurized fluidized furnace 20 from the pipes 94 and 96 and the starting burner 22 and is combusted in the pressurized fluidized furnace 20 to become combustion exhaust gas.
  • Air preheater 40, pipe 92, dust collector 50, pipe 93, supercharger 60, pipe 97, white smoke prevention preheater 70, pipe 98, flue gas treatment tower 80, and chimney 87 are discharged into the atmosphere. Is done.
  • the combustion air supplied from the compressor 62 can also be released to the atmosphere by an atmosphere opening channel (not shown) that branches from the pipe 94 and communicates with the chimney 87 and the like (not shown).
  • an atmosphere opening channel (not shown) that branches from the pipe 94 and communicates with the chimney 87 and the like (not shown).
  • the damper that is normally closed in the flow path is opened.
  • the combustion air supplied from the compressor 62 can be released to the atmosphere, so that even if the compressed air supply process does not operate, surge of the compressor 62 can be prevented. it can.
  • the pressure in the combustion air supply pipe 24 that supplies the combustion air to the pressurized fluidized furnace 20 decreases, and the fluidized sand in the pressurized fluidized furnace 20 may flow back into the combustion air supply pipe 24. Therefore, it is preferable that the timing of releasing the combustion air to the atmosphere is performed after the compressed air supply stop process is completed.
  • a drive is stopped when the numerical value measured by the pressure sensor 110 exceeds a preset value before performing a compressed air supply process, and pressurization flow is carried out from the input pump 12.
  • the supply of the object to be processed into the furnace 20 is stopped.
  • the combustion exhaust gas discharged from the pressurized fluidized furnace 20 is reduced, and the rotation of the turbine 61 of the supercharger 60 is gradually reduced and discharged from the compressor 62.
  • the combustion air is gradually reduced, and the driving of the supercharger 60 is stopped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Incineration Of Waste (AREA)
  • Air Supply (AREA)
PCT/JP2013/058330 2012-03-26 2013-03-22 加圧流動炉システムの非常停止方法 WO2013146599A1 (ja)

Priority Applications (2)

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KR1020147027672A KR102067303B1 (ko) 2012-03-26 2013-03-22 가압유동로 시스템의 비상정지 방법
CN201380013626.XA CN104220810B (zh) 2012-03-26 2013-03-22 加压流化炉系统的紧急停止方法

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JP2012069489A JP5832944B2 (ja) 2012-03-26 2012-03-26 加圧流動炉システムの非常停止方法
JP2012-069489 2012-03-26

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000213306A (ja) * 1999-01-21 2000-08-02 Hitachi Ltd 加圧流動床複合発電プラント

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH064172Y2 (ja) * 1987-04-24 1994-02-02 バブコツク日立株式会社 流動層燃焼装置の炉内圧制御装置
SE458955B (sv) * 1987-10-20 1989-05-22 Abb Stal Ab Pfbc-kraftanlaeggning
SE464715B (sv) * 1987-12-02 1991-06-03 Asea Stal Ab Saett att reglera en pfbc-anlaeggning vid driftstoerning i gasturbinaggregat och en pfbc-anlaeggning med utrustning foer saadan reglering
JP3006625B2 (ja) * 1990-10-03 2000-02-07 バブコツク日立株式会社 加圧流動層ボイラ
JP2624891B2 (ja) * 1990-11-30 1997-06-25 株式会社日立製作所 加圧流動層ボイラ発電プラント
JPH0650509A (ja) * 1992-07-31 1994-02-22 Ishikawajima Harima Heavy Ind Co Ltd 加圧流動層ボイラの緊急運転方法
US5526582A (en) * 1994-03-31 1996-06-18 A. Ahlstrom Corporation Pressurized reactor system and a method of operating the same
JP3621809B2 (ja) * 1997-06-27 2005-02-16 三菱重工業株式会社 複合発電システムにおけるガスタービン出力増加方法
JP2003114004A (ja) * 2001-10-04 2003-04-18 Babcock Hitachi Kk 加圧流動層ボイラの緊急減圧システム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000213306A (ja) * 1999-01-21 2000-08-02 Hitachi Ltd 加圧流動床複合発電プラント

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JP5832944B2 (ja) 2015-12-16
CN104220810A (zh) 2014-12-17
CN104220810B (zh) 2016-09-21
JP2013200088A (ja) 2013-10-03
KR102067303B1 (ko) 2020-01-16
KR20140148406A (ko) 2014-12-31

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