WO2018016108A1 - Appareil de chauffage et de cuisson et procédé de cuisson pour cendres volantes - Google Patents

Appareil de chauffage et de cuisson et procédé de cuisson pour cendres volantes Download PDF

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Publication number
WO2018016108A1
WO2018016108A1 PCT/JP2017/005421 JP2017005421W WO2018016108A1 WO 2018016108 A1 WO2018016108 A1 WO 2018016108A1 JP 2017005421 W JP2017005421 W JP 2017005421W WO 2018016108 A1 WO2018016108 A1 WO 2018016108A1
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WO
WIPO (PCT)
Prior art keywords
heating
unburned carbon
fly ash
combustion
raw powder
Prior art date
Application number
PCT/JP2017/005421
Other languages
English (en)
Japanese (ja)
Inventor
一成 謝花
好雄 岸田
拓人 南出
三島　剛
Original Assignee
株式会社リュウクス
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社リュウクス filed Critical 株式会社リュウクス
Priority to CN201780039618.0A priority Critical patent/CN109328119B/zh
Publication of WO2018016108A1 publication Critical patent/WO2018016108A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/10—Rotary-drum furnaces, i.e. horizontal or slightly inclined internally heated, e.g. by means of passages in the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/08—Screw feeders; Screw dischargers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention relates to a fly ash heating and baking apparatus and a baking method.
  • fly ash produced as a by-product at thermal power plants is widely used as a concrete admixture.
  • fly ash When fly ash is used as an admixture for concrete, it is necessary to reduce the unburned carbon content contained in fly ash as much as possible.
  • Patent Document 1 discloses a modified fly ash and a manufacturing method thereof. According to this method, the self-burning of unburned carbon is carried out while stirring and conveying the raw fly ash having an unburned carbon content of 3.90 to 7.70% by weight and an average particle size of 18.40 to 20.80 microns. It is said that the reformed fly ash can be recovered by heating to a temperature, and subsequently maintaining the heating temperature within a temperature range of 600 to 950 ° C. for self-combustion and then indirectly cooling to 200 ° C. or lower. Yes.
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a miniaturized fly ash heating and firing apparatus and firing method.
  • the present invention is a heating and firing apparatus having a combustion furnace for burning and reducing the unburned carbon of raw powder containing fly ash and unburned carbon, wherein the combustion furnace agitates the unburned carbon in the furnace And a combustion means for burning fuel toward the inside of the furnace filled with oxygen supplied from the oxygen supply means. Heating at least the unburned carbon in the raw powder supplied to the combustion furnace to a heating set temperature higher than a temperature lower by at least 200 ° C. than the ignition temperature of the unburned carbon.
  • An apparatus is provided separately, and the heating apparatus is a heating and firing apparatus configured to heat the unburned carbon without using internal combustion that requires air in an internal space where the unburned carbon exists.
  • a downsized fly ash heating and firing apparatus and firing method can be provided.
  • the block diagram which shows the structure of the heat-baking apparatus and heating reforming system of fly ash.
  • the block diagram which shows the detail of a structure of a fixed_quantity
  • the block diagram which shows the detail of a structure of a carbon high temperature oxidation furnace.
  • FIG. 1 is a block diagram showing a configuration of a heat reforming system 1 including a fly ash heating and firing apparatus 2.
  • the fly ash heat reforming system 1 includes a heating and firing apparatus 2 for reforming fly ash by heating and burning unburned carbon contained in the fly ash raw powder, and the supplied fly ash raw powder.
  • the stored fly ash reservoir 3, the quantitative supply device 4 that quantitatively supplies the stored fly ash raw powder to the heating and baking apparatus 2, and the high-temperature fly ash modified by the heating and baking apparatus 2 are cooled.
  • the cooling equipment 5, the dust removing device 6 that removes dust and the like contained in the exhaust gas discharged by the heating and firing device 2 during the heat combustion process, and the exhaust gas from which dust and the like have been removed by the dust removing device 6 are removed from the heating reforming system 1.
  • an exhaust device 7 for discharging the gas.
  • the heating and firing apparatus 2 includes a power heating apparatus 8 (heating apparatus) that heats unburned carbon by induction heating, and a carbon high-temperature oxidation furnace 9 (combustion furnace) that burns unburned carbon.
  • the fly ash raw powder is mainly composed of silica (SiO 2) and may contain alumina (Al 2 O 3).
  • the fly ash reservoir 3 has a hollow cylindrical shape whose axis is directed in the vertical direction, and is provided with an inlet 3c at the upper end.
  • the cylindrical lower portion is reduced in diameter toward the lower side,
  • a connecting pipe 3b having a connecting port 3a at the lower end is connected to the lower lower end.
  • the fly ash reservoir 3 is connected to the supply pipe 17 of the quantitative supply device 4 through the connection port 3a.
  • the fly ash reservoir 3 stores the fly ash raw powder charged into the charging port 3c, and supplies the fly ash raw powder from the connection port 3a to the quantitative supply device 4 by gravity drop. Thereby, the fly ash reservoir 3 functions as a raw material hopper using fly ash raw powder as a raw material.
  • the fly ash reservoir 3 includes a preheating device 10.
  • the preheating device 10 is connected to the exhaust gas port 9a of the carbon high-temperature oxidation furnace 9 and connected to the remaining heat supply pipe 13 for sucking the exhaust gas, and connected to the other end of the remaining heat supply pipe 13 and connected to the fly ash reservoir 3.
  • An annular preheat circulation pipe 11 that circulates the exhaust gas at a close position, a discharge pipe 14 that is connected to the preheat circulation pipe 11 at one end and discharges the exhaust gas to the dust removing device 6 at the other end, and a discharge pipe 14 And a control valve 16 for switching execution / stop of exhaust gas, and a signal for switching exhaust execution / stop by the control valve 16 by detecting the temperature of the exhaust gas circulated in the residual heat circulation pipe 11. And a temperature sensor 15 for performing the operation.
  • a high-temperature exhaust gas of 200 ° C. or higher is supplied from the exhaust gas port 9 a of the carbon high-temperature oxidation furnace 9 through the residual heat supply pipe 13, and this high-temperature exhaust gas is supplied to the residual heat circulation pipe 11 in the vicinity of the fly ash reservoir 3.
  • the fly ash raw powder in the fly ash reservoir 3 is preheated and the exhaust gas in the residual heat circulation pipe 11 is lowered to a predetermined temperature, and the control valve 16 opens the discharge pipe to discharge the exhaust pipe.
  • the exhaust gas is discharged from 14 to the dust removing device 6.
  • a high temperature exhaust gas of 200 ° C. or higher is supplied from the residual heat supply pipe 13, and the temperature of the exhaust gas in the residual heat circulation pipe 11 that has decreased is reduced. High temperature is maintained at a predetermined temperature.
  • the predetermined temperature is set to 200 ° C. in this embodiment, but is not limited to 200 ° C.
  • the low-temperature exhaust gas discharged from the residual heat circulation pipe 11 is discharged out of the heating reforming system 1 from the exhaust device 7 via the dust removal device 6.
  • the quantitative supply device 4 has a cylindrical shape, a supply pipe 17 whose axis is oriented substantially in the horizontal direction, and a shaft 18 that is disposed on the axis of the supply pipe 17 and that can rotate about the axis.
  • a screw 19 that is provided around the outer peripheral surface of the shaft 18 and rotates together with the shaft 18 to convey the fly ash raw powder preheated inside the supply pipe 17, and a drive device 20 that drives the shaft 18 to rotate about its axis. It has.
  • the supply pipe 17 is connected at its rear end to a flange 21d at one end of a heat treatment pipe 21 provided in the power heating device 8 by a flange 17d. That is, the supply pipe 17 and the heat treatment pipe 21 have the same inner diameter and are connected in a straight line via the connection port 17a.
  • An inlet 17b is opened on the upper surface of the front peripheral wall of the supply pipe 17, and a connection port 3a of the fly ash reservoir 3 is connected to the opening.
  • the front end of the supply pipe 17 is sealed with a sealing plate 17c.
  • the shaft 18 is disposed so that one end reaches the vicinity of the connection port 17a of the supply pipe 17 through the sealing plate 17c.
  • the shaft 18 that protrudes outward from the supply pipe 17 from the sealing plate 17 c is rotatably supported by a pair of bearings 20 a and 20 b through which the shaft 18 is inserted, outside the supply pipe 17.
  • the screw 19 is a spiral blade and is housed inside the supply pipe 17 in the radial direction together with the shaft 18.
  • the outer diameter and pitch of the screw 19 are appropriately selected depending on the properties of the preheated fly ash raw powder and the amount of extrusion.
  • the driving device 20 includes an electric motor 20g, a driving sprocket 20c attached to the rotary shaft 20f of the electric motor 20g, a driven sprocket 20d attached to the rear end of the shaft 18, and a driving sprocket 20c. And a chain 20e for connecting the sprocket 20d.
  • the rotational force of the electric motor 20g is transmitted to the driving sprocket 20c via the rotating shaft 20f, and further to the driven sprocket 20d via the chain 20e.
  • the driven sprocket 20d is It is transmitted to the attached shaft 18.
  • the screw 19 rotates around the axis of the shaft 18 together with the shaft 18 inside the supply pipe 17 by the rotational force from the electric motor 20g transmitted to the shaft 18.
  • the preheated fly ash raw powder stored in the fly ash reservoir 3 is supplied by gravity to the front stage of the supply pipe 17 via the inlet 17b opened on the front side peripheral wall of the supply pipe 17. It becomes a clogged state without a gap.
  • the preheated fly ash raw powder supplied to the front stage of the supply pipe 17 is gradually sent out to the rear side of the supply pipe 17 by the screw 19 without being clogged.
  • tube 17 is supplied to the heat processing pipe
  • the preheated fly ash raw powder is continuously supplied by dropping from the fly ash reservoir 3 to the front stage of the supply pipe 17 after the preheated fly ash raw powder has moved, without gaps.
  • the clogged state is maintained.
  • the preheated fly ash raw powder can be continuously supplied to the electric power heating device 8 at a predetermined fixed amount per unit time by controlling the rotation speed of the electric motor 20g to a predetermined value.
  • the term “packed without gaps” does not mean that there are not even minute gaps between adjacent particles in the fly ash raw powder, but indicates that the adjacent particles are in contact and overlapping.
  • the state in which the fly ash raw powder is clogged in the supply pipe 17 and the heat treatment pipe 21 in the subsequent stage without crevice is a state in which more than half of the internal space is clogged, and is a state in which more than 70% is clogged. It is preferable that
  • the heating and firing apparatus 2 includes a power heating apparatus 8 (heating apparatus) for heating fly ash raw powder (particularly unburned carbon contained therein), and a carbon high-temperature oxidation furnace 9 (combustion furnace) for burning unburned carbon. And.
  • the power heating device 8 includes a heat treatment tube 21, an induction coil 22, a high frequency induction heating power source (high frequency inverter) 23, and a high frequency converter feeder 24 connected between the induction coil 22 and the high frequency induction heating power source 23.
  • a control device 25 that controls the output of the high-frequency induction heating power source 23 by a computer and a temperature sensor TS that is attached to the heat treatment tube 21 and measures temperature are provided.
  • the heat treatment tube 21 has a hollow cylindrical shape with the axis centering substantially in the horizontal direction.
  • the cylindrical inner diameter of the heat treatment tube 21 can be 200 millimeters or less, preferably 100 millimeters or less, and in this embodiment is configured to 100 millimeters or less.
  • the heat treatment tube 21 may have a cylindrical shape having a columnar central axis therein. In this case, the distance (radial direction distance) between the cylindrical inner peripheral surface of the heat treatment tube 21 and the central axis surface can be set to 100 millimeters or less, and preferably 50 millimeters or less.
  • Flange 21d, 21e is provided at both cylindrical ends of the heat treatment tube 21.
  • a flange 21 d at the front end of the heat treatment tube 21 is connected to the supply pipe 17 of the quantitative supply device 4, and a flange 21 e at the rear end of the heat treatment tube 21 is connected to the charging unit 30 of the carbon high temperature oxidation furnace 9.
  • the supply pipe 17, the heat treatment pipe 21, and the charging section 30 have the same inner diameter and are arranged and connected in a straight line so that the axes are connected.
  • the heat treatment tube 21 is made of a carbon material containing a large amount of iron.
  • the heat treatment tube 21 is preferably made of a magnetic metal having heat resistance of 600 ° C. which is at least an ignition temperature (self-combustion temperature).
  • the inner surface of the heat treatment tube 21 does not need to be uneven, and may have a fine surface roughness that allows the fly ash raw material to slide. By doing so, the fly ash raw powder can be heated while being smoothly moved. It should be noted that the inner surface of the heat treatment tube 21 may be slightly uneven as long as it is not a polished surface like a mirror surface.
  • the induction coil 22 is provided so as to be wound around the outer periphery of the heat treatment tube 21.
  • the induction coil 22 is provided in a plurality of stages from the front stage to the rear stage.
  • the induction coil 22 is composed of three coils: a front stage coil 22a, a middle stage coil 22b, and a rear stage coil 22c.
  • the front coil 22a is wound around the front part 21a of the heat treatment tube 21
  • the middle coil 22b is wound around the middle part 21b of the heat treatment tube
  • the rear coil 22c is wound around the rear part 21c of the heat treatment tube 21. It is rolled up.
  • one temperature sensor TS is provided corresponding to each induction coil 22, and in this embodiment, the temperature sensor TS is provided in the front stage portion 21 a, the middle stage portion 21 b, and the rear stage portion 21 c of the heat treatment tube 21.
  • TS1, TS2, and TS3 are provided respectively. Then, the data of each measured temperature obtained by the temperature sensors TS1, TS2, and TS3 is acquired by the control device 25.
  • the high frequency induction heating power source 23 is a power source that can output a high frequency alternating current.
  • the high frequency output from the high frequency induction heating power source 23 can be 20 kHz to 200 kHz, and preferably 20 kHz to 100 kHz.
  • the high-frequency induction heating power source 23 can be controlled by an external signal.
  • the high-frequency induction heating power source 23 includes three units of a power source 23a, a power source 23b, and a power source 23c corresponding to the induction coil 22 of each stage.
  • the high-frequency converter feeder 24a, the high-frequency converter feeder 24b, and The high-frequency converter feeder 24c is connected to the front-stage coil 22a, the middle-stage coil 22b, and the rear-stage coil 22c.
  • the control device 25 includes a high-frequency induction heating power source 23 so that the temperatures of the front stage part 21a, the middle stage part 21b, and the rear stage part 21c of the heat treatment tube 21 are kept constant at the set temperatures T1, T2, and T3, respectively. Control the output of.
  • the set temperature T3 is preferably set to be equal to or higher than the ignition temperature (self-combustion temperature) of unburned carbon
  • the set temperature T2 is preferably set to about 2/3 of the set temperature T3
  • the set temperature T1 is set to the set temperature. It is preferable to set the temperature to about 1/3 of T3.
  • the above-mentioned temperature of about 2/3 or about 1/3 refers to a temperature of about 2/3 or about 1/3 of the ignition temperature based on 0 ° C.
  • the set temperatures T1, T2, and T3 of the front stage portion 21a, the middle stage portion 21b, and the rear stage portion 21c are set to 200 ° C., 400 ° C., and 600 ° C., respectively.
  • the temperature is increased stepwise from the front stage to the rear stage, and the heating temperature at each position is set linearly so that the temperature rises linearly from the temperature before heating to the heating temperature of the last stage.
  • the set temperature T3 of the rear stage 21c, which is the last stage to 600 ° C, which is the ignition temperature (self-combustion temperature), and lowering the set temperature of the preceding stage, ignition (self-combustion) starts and runs out of control. Is preventing.
  • the control device 25 is also connected to the electric motor 20g provided in the above-described quantitative supply device 4 through a signal line, and can control the rotation speed of the electric motor 20g.
  • the preheated fly ash raw powder is supplied to the front stage portion 21a of the heat treatment tube 21 from the quantitative supply device 4 connected to the heat treatment tube 21 in a state of being packed without any gaps.
  • the fly ash raw powder reaches the upper part of the heat treatment tube 21 as the fly ash raw powder is pushed out.
  • the powder becomes clogged.
  • the fly ash raw powder is pushed out in the order of the front part 21 a, the middle part 21 b, and the rear part 21 c, and becomes packed in each part of the heat treatment tube 21. Therefore, in the heat treatment tube 21, the fly ash raw powder is not agitated, hardly flows, and moves in a packed state where the relative positions of the fly ash raw powders do not change so much.
  • An alternating current is output from the power supplies 23a, 23b, and 23c to the front coil 22a, the middle coil 22b, and the rear coil 22c via the high-frequency converter feeders 24a, 24b, and 24c, respectively.
  • a magnetic field is generated around the front coil 22a, the middle coil 22b, and the rear coil 22c through which an alternating current flows, that is, inside each of the front stage 21a, the middle stage 21b, and the rear stage 21c.
  • an eddy current flows by being induced by the magnetic field at each position of the front stage portion 21a, the middle stage portion 21b, and the rear stage portion 21c.
  • the eddy current flowing in the heat treatment tube 21 generates heat (that is, induction heating) due to the resistance of the heat treatment tube 21 itself, and this heat causes fly in the front stage portion 21a, the middle stage portion 21b, and the rear stage portion 21c. Heat the ash powder. Furthermore, since the unburned carbon contained in fly ash raw powder by several percent has conductivity, it is induction-heated at the front-stage part 21a, the middle-stage part 21b, and the rear-stage part 21c, respectively. The inside of the heat treatment tube 21 is in a state where the fly ash raw powder is clogged and there is almost no oxygen (air), in other words, there is no amount of oxygen (air) necessary for ignition (self-combustion) of unburned carbon.
  • heat that is, induction heating
  • the control device 25 acquires measured temperature data measured by the temperature sensors TS1, TS2, TS3.
  • the control device 25, on the contrary, lowers the output decrease signal at a high portion compared to the set temperatures T1, T2, T3 of the front stage portion 21a, the middle stage portion 21b, and the rear stage portion 21c.
  • An output increase signal is transmitted to each of the power supplies 23a, 23b, and 23c.
  • the power supplies 23a, 23b, and 23c that have received the signal reduce or increase the output according to their received signals.
  • control device 25 controls the outputs of the power supplies 23a, 23b, and 23c based on the measured temperature data of the temperature sensors TS1, TS2, and TS3, so that the front stage 21a, the middle stage 21b, and the rear stage 21c are controlled. Each temperature is brought close to the set temperature T1, T2, T3 and kept constant.
  • the content of unburned carbon contained in the fly ash raw powder is about several percent, but it is not constant and varies, and it is difficult to accurately grasp. Therefore, the calorific value of unburned carbon due to induction heating varies depending on the difference in the content of unburned carbon. This variation in the amount of generated heat further causes the temperature of the front stage part 21a, the middle stage part 21b, and the rear stage part 21c to fluctuate. Therefore, in order to keep the temperatures of the front stage part 21a, the middle stage part 21b, and the rear stage part 21c constant at the set temperatures T1, T2, and T3, the outputs of the power supplies 23a, 23b, and 23c must be greatly increased or decreased. Cases can also arise.
  • the power supplies 23a, 23b, and 23c have an appropriate output range, and an output exceeding the appropriate output range is not preferable because an excessive load is applied to the power supply 23a. Therefore, in addition to controlling the outputs of the power supplies 23a, 23b, and 23c, new control is added so that the amount of unburned carbon contained in the fly ash raw powder per unit time supplied to the heat treatment tube 21 is constant. is doing. That is, based on the measured temperature data of the temperature sensor TS3, the control device 25 increases or decreases the number of rotations of the electric motor 20g provided in the quantitative supply device 4 so that the temperature of the rear stage portion 21c becomes constant at the set temperature T3. It is supposed to let you. That is, the control device 25 also controls the rotational speed of the electric motor 20g.
  • the outputs of the power supplies 23a, 23b, and 23c are individually controlled based on the measured temperature data of the temperature sensors TS1, TS2, and TS3, and the rotation speed of the electric motor 20g is controlled at the last stage. This is executed based on measured temperature data of a certain temperature sensor TS3.
  • control device 25 performs cascade control that combines control of the number of revolutions of the electric motor 20g in addition to control of the output of the power source 23c. Therefore, delicate temperature adjustment of unburned carbon is possible. Thereby, the temperature of the fly ash raw powder in the rear stage part 21c is more accurately maintained at the set temperature T3 of the rear stage part 21c.
  • the fly ash raw powder supplied into the heat treatment tube 21 is contained in the fly ash raw powder and the same while moving in the heat treatment tube 21 in a substantially oxygen-free state without supply of oxygen.
  • the unburned carbon is heated stepwise by the heat treatment tube 21 that is heated stepwise by induction heating of the front coil 22a, the middle coil 22b, and the rear coil 22c.
  • the fly ash raw powder containing unburned carbon heated to the set temperature T3 is put into the carbon high-temperature oxidation furnace 9 of the next step.
  • the set temperature T3 is set to 600 ° C. in this embodiment, but is set higher than a temperature (for example, 400 ° C.) that is at least 200 ° C. lower than the ignition temperature of the unburned carbon (for example, 600 ° C.). You may set more than preheating preset temperature.
  • induction heating is used to heat the fly ash raw powder in the heat treatment tube 21, but the present invention is not limited to induction heating. If the fly ash raw powder in the heat treatment tube 21 can be heated in an almost oxygen-free state, for example, it is heated from the outside of the heat treatment tube 21 by using an external heat source, or in the axial center portion of the heat treatment tube 21. A heating device may be provided to heat from the inside.
  • the heat treatment tube 21 in order to raise the temperature of the unburned carbon to the ignition temperature or higher, the heat treatment tube 21 is divided into three steps, and the set temperatures of the steps are set in steps T1, T2, and Although it is set to T3 and heating is performed in three stages, the heating is not limited to three stages, and may be performed in appropriate plural stages.
  • the plurality of stages are preferably set to appropriate stages such as heating in 1 to 5 stages.
  • the carbon high-temperature oxidation furnace 9 has a furnace body 26 that is a hollow cylindrical kiln whose axis is oriented in a substantially horizontal direction, and the furnace body 26 can be rotated around the axis.
  • the rotary furnace includes a furnace body support part 27 supported at the lower part, an input side hood 28 that covers one end part of the furnace body 26, and a discharge side hood 29 that covers the other end part of the furnace body 26.
  • the furnace body 26 has a substantially cylindrical shape as a whole, and is provided with a cover portion 26 b at one end connected to the input side hood 28.
  • the cover portion 26b has a disk shape with a hole in the center, and the outer peripheral portion of the disk is connected to the edge of one end of the cylindrical shape.
  • screw blades 26c Inside the furnace body 26, there are provided screw blades 26c in which convex portions that are convex inwardly continue in a screw shape along the inner peripheral surface.
  • the inner surface (inner surface) including the screw blades 26c and the cover portion 26b of the furnace body 26 is covered with an aluminum oxide refractory material to form an inner lining 26a.
  • the furnace body 26 can avoid metal corrosion under high temperature caused by vanadium oxide contained in the fly ash raw powder and can have fire resistance of about 1000 ° C. .
  • the inner lining 26a has an uneven finish such that plasterers applied plaster or earthen walls to the walls of houses and fences, and has a rougher surface than the metal surface.
  • the unevenness can be an unevenness having an average height difference of 50 microns or more, and the average height difference is preferably 1 cm to 5 cm.
  • the unevenness of the inner lining 26a improves the frictional force and prevents the fly ash raw powder that self-combusts from moving relative to the inner surface of the furnace body 26 so as to slide in a lump-like state without stirring. Ash raw powder can be stirred.
  • An appropriate cooling device (not shown) for preventing a temperature rise in the room is provided outside the furnace body 26.
  • the furnace body support portion 27 is chained to a rotating body 27a that rotatably supports the outer peripheral surface of the furnace body 26, an installation base 27b on which the rotating body 27a is installed, and a driven sprocket 27c attached to the rotating body 27a. And a drive motor 27f for driving a drive-side sprocket 27e connected through 27d. Thereby, by controlling the rotational speed of the drive motor 27f, the rotational speed around the axis of the furnace body 26 can be changed, and the furnace body 26 can be kept rotating at the set rotational speed.
  • the charging side hood 28 has a charging unit 30 for charging the fly ash raw powder heated by the power heating device 8 into the furnace body 26, and for discharging the combustion gas generated in the furnace body 26 as exhaust gas. And an exhaust gas port 9a.
  • the charging unit 30 is a pipe that penetrates the charging side hood 28 in the front-rear direction.
  • the axis is substantially coincident with the central axis of the furnace body 26, and one end is connected to the flange 21 e at the rear end of the heat treatment pipe 21 of the power heating device 8.
  • the other end is opened in the furnace body 26 to form a charging port 30a.
  • the inner diameter of the charging unit 30 is the same as the inner diameter of the heat treatment tube 21, and the axis of the charging unit 30 is configured to coincide with the axis of the heat processing tube 21.
  • the opening surface 30b of the insertion port 30a faces upward.
  • a leakage prevention portion 30c in which the lower part of the tube that has been cylindrical and curved upward is curved.
  • the fly ash raw powder containing unburned carbon heated by the electric power heating device 8 is supplied by being pushed out from the heat treatment tube 21 to the charging unit 30 and further pushed out into the furnace body 26 from the charging port 30a. It is thrown. At this time, the fly ash raw powder pushed out in the charging unit 30 is spilled by the leakage preventing unit 30c without being spilled immediately, and further pushed out and then overflowed from the upward charging port 30a. It is thrown into. Thereby, the state where the fly ash raw powder is packed without gaps in the charging unit 30 can be maintained, and in particular, the state where the fly ash raw powder is packed without gaps in the heat treatment tube 21 can be maintained.
  • the fly ash raw powder is prevented from collapsing and a space with oxygen in the charging unit 30 and the heat treatment tube 21 is prevented, and combustion gas, oxygen and the like enter the charging unit 30 and the heat processing tube 21.
  • FIG. since the fly ash raw powder can be introduced so that the fly ash raw powder overflows while reliably covering the entire opening of the input port 30a, oxygen (air) from the input port 30a to the inside of the input unit 30 can be introduced. Inflow can be reliably prevented, and unburned carbon in the fly ash raw powder can be more reliably prevented from starting to ignite (self-combustion) in the charging unit 30 or the heat treatment tube 21.
  • the carbon high temperature oxidation furnace 9 receives a small amount of fly ash raw powder supplied to the internal space, and heats and burns this small amount of fly ash raw powder while stirring.
  • the amount of fly ash raw powder in the carbon high-temperature oxidation furnace 9 can be half or less of the internal space, preferably 30% or less, more preferably 10% or less. % Or less is more preferable.
  • the above-described residual heat supply pipe 13 is connected to the exhaust gas port 9a.
  • An exhaust gas pipe 31 branched from the residual heat supply pipe 13 is connected to the residual heat supply pipe 13.
  • the exhaust gas pipe 31 is connected to the dust removing device 6 (see FIG. 1) via the heat exchanger 32. Therefore, the hot exhaust gas discharged from the exhaust gas port 9 a and flowing in the exhaust gas pipe 31 is cooled by the heat exchanger 32 and then sent to the dust removing device 6.
  • the discharge side hood 29 includes an auxiliary combustion burner 33 for injecting and burning fuel together with air (primary air) into the furnace body 26, a plurality of blowing nozzles 34 for blowing air (tertiary air) into the furnace body 26, and a discharge port 35 is provided.
  • the auxiliary combustion burner 33 burns fuel and heats the inside of the furnace body 26 to a high temperature.
  • the auxiliary combustion burner 33 is located on the central axis of the furnace body 26, and is arranged so that the ejection hole 33a for ejecting fuel faces the inlet 30a for fly ash raw powder.
  • the plurality of blowing nozzles 34 are arranged so as to surround the auxiliary combustion burner 33, and are swung by a rotation mechanism (not shown) around the auxiliary combustion burner 33 along the inner surface facing the furnace body 26 of the discharge side hood 29. To do. More specifically, a plurality of blowing nozzles 34 are arranged at equal distances from the auxiliary burner 33 so that the distance between them is also equal. When viewed in the direction of the rotation axis of the furnace body 26, the blowing nozzles 34 are arranged. Makes a vertex of the polygon. In this embodiment, four blowing nozzles 34 are arranged so as to form square vertices when viewed in the rotation axis direction of the furnace body 26.
  • Each of the plurality of blowing nozzles 34 feeds air (tertiary air) at the same amount and constant speed as a counterflow in the direction of movement of the fly ash raw powder (right direction in FIG. 3) and the opposite direction (left direction in FIG. 3).
  • the amount of air around the auxiliary burner 33 is made substantially equal.
  • the air (primary air) supplied to the auxiliary burner 33 and the air (tertiary air) blown into the furnace body 26 from the blow nozzle 34 are taken in by the pushing fan 36 and the furnace body via the heat exchanger 32. 26 is the air sent into the air. Therefore, air (primary air) and air (tertiary air) are heated in the heat exchanger 32 by heat exchange with high-temperature exhaust gas flowing through the exhaust gas pipe 31. This prevents the temperature of the air (primary air and tertiary air) from being too low relative to the temperature inside the furnace body 26 and prevents the air (primary air and tertiary air) from lowering the temperature inside the furnace body 26 as much as possible. is doing.
  • the discharge port 35 is provided in the lower part of the discharge side hood 29 and is connected to the cooling facility 5.
  • the fly ash raw powder charged into the furnace body 26 from the charging port 30a of the charging unit 30 is gradually stirred toward the discharge port 35 while being stirred by the screw blades 26c in the furnace body 26 rotating around the axis. Moving. During this movement, the unburned carbon contained in the fly ash raw powder is burned (oxidized) in a high-temperature oxygen atmosphere to emit carbon dioxide and heat to be removed. The temperature in the furnace body 26 at this time is 800 to 900 ° C. Then, the fly ash raw powder that has reached the discharge port 35 is discharged to the cooling facility 5.
  • the rotation speed of the drive motor 27f provided in the furnace body support part 27 is adjusted according to the amount of unburned carbon contained in the fly ash raw powder to be processed.
  • the rotational speed around the axial center of the furnace body 26 is changed, and the moving speed of the fly ash raw powder moving in the furnace body 26 is adjusted by the rotating screw blades 26c, thereby adjusting the increase / decrease in the combustion time. it can.
  • the moving speed of the fly ash raw powder is reduced, the residence time in the furnace body 26 is lengthened and the combustion time is increased. Conversely, if the moving speed is increased, the residence time in the furnace body 26 is increased. Shortens and burns down.
  • the dust remover 6 includes a front cyclone 6a and a rear bag filter 6b.
  • the former cyclone 6a after being discharged from the preheating device 10 of the fly ash reservoir 3 through the exhaust pipe 14 for exhausting the exhaust gas whose temperature has decreased and the exhaust gas port 9a of the carbon high temperature oxidation furnace 9, An exhaust gas pipe 31 through which the exhaust gas cooled by the heat exchanger 32 flows is connected.
  • the dust remover 6 removes dust and the like contained in the exhaust gas flowing in through the exhaust pipe 14 and the exhaust gas pipe 31 using the cyclone 6a and the bag filter 6b, and then exhausts the exhaust gas from which the dust and the like are removed. Discharge to device 7.
  • the exhaust device 7 attracts the exhaust gas from which dust or the like has been removed by the dust removal device 6 with the attracting fan 7a, and then exhausts it outside the heating reforming system 1 through the exhaust tower 7b.
  • the cooling facility 5 receives the fly ash raw powder discharged from the discharge port 35 of the carbon high-temperature oxidation furnace 9 and containing unburned carbon reduced by the combustion, and performs a cooling process.
  • the heating and firing apparatus 2 is a heating in which at least unburned carbon in the fly ash raw powder supplied to the combustion furnace (carbon high temperature oxidation furnace 9) is set higher than a temperature at least 200 ° C. lower than the ignition temperature of the unburned carbon. Since the heating device (electric power heating device 8) for heating above the set temperature is provided in the front stage of the combustion furnace (carbon high temperature oxidation furnace 9), the combustion furnace itself can be made small-scale, thereby reducing the capital investment. Can be suppressed. In addition, since less fuel is used in the combustion furnace, energy costs can be suppressed.
  • the fly ash raw powder is heated only from the carbon high-temperature oxidation furnace 9 from room temperature (room temperature) to the ignition temperature, a large amount of fuel and air are consumed by the auxiliary burner 33 and the entire space inside the furnace body 26 is fried. It is necessary to heat the ash raw powder. For this reason, it is necessary to secure a wide space inside the furnace body 26 for a long time.
  • the fly ash raw powder is raised to the ignition temperature and further unburned by heating it with the electric power heating device 8 at a heating set temperature that is set close to the ignition temperature.
  • the time during which the fly ash raw powder to be burned is burned by the carbon high-temperature oxidation furnace 9 can be shortened (the time for burning from the normal temperature to the ignition temperature can be omitted).
  • the distance moved within the body 26 can be shortened. Therefore, the furnace body 26 can be reduced in size by reducing the distance, and the overall size of the carbon high temperature oxidation furnace 9 can be reduced.
  • the heating device includes a transport pipe (heat treatment pipe 21) for transporting the raw powder to the combustion furnace, and does not supply oxygen into the transport pipe, and the oxygen-free heating means for heating the unburned carbon to a heating set temperature or higher. It is comprised by.
  • a transport pipe heat treatment pipe 21
  • the oxygen-free heating means for heating the unburned carbon to a heating set temperature or higher. It is comprised by.
  • unburned carbon can be heated without relying on internal combustion that requires air in the transport pipe (heat treatment pipe 21). Therefore, the heating device is not increased in scale, and the thermal efficiency is good. That is, the electric power heating device 8 does not require a combustion space in which air is supplied as in the furnace body 26 and heats the fly ash raw powder in a state where the heat treatment tube 21 is packed in the gap without any gap.
  • the size can be reduced to half or less, more specifically, to 1/5 or less.
  • fly ash raw powder can be directly heated from the circumference
  • unburned carbon in the fly ash raw powder can be heated by induction heating, direct heating can be realized.
  • the heating device (electric power heating device 8) intensively heats the heat treatment tube 21 arranged in the vicinity of the induction coil supplied with the alternating current from the high frequency power supply by induction heating using a high frequency power source having high energy density. . Therefore, high speed heating of fly ash raw powder containing unburned carbon is possible, and energy efficiency is also good. In addition, the scale of the apparatus can be reduced, and it is space-saving and compact.
  • the combustion furnace (carbon high-temperature oxidation furnace 9) is opposed to the charging port 30a, and a charging port 30a for charging fly ash raw powder containing unburned carbon heated by a heating device (power heating device 8) into the combustion furnace.
  • a discharge part (discharge port 35) through which the modified fly ash is combusted at the position and the reformed fly ash is discharged, and the auxiliary burner 33 (combustion means) is disposed on the discharge part side in the combustion furnace.
  • a fuel ejection hole 33a is disposed.
  • the opening surface 30b of the charging port 30a faces upward and the leakage preventing portion 30c is provided, the fly ash raw powder is charged into the furnace body 26 so as to overflow from the opening surface 30b. Therefore, the combustion gas, oxygen, and the like in the furnace body 26 are less likely to enter the heating device into the pipe of the charging unit 30 packed with fly ash raw powder. Therefore, it is difficult for combustion to occur in the electric power heating device 8, and unintentional carbon in the fly ash raw powder can be prevented from igniting in the electric power heating device 8 and excessively rising in temperature.
  • the heating device electric power heating device 8
  • at least one of the supply amount of the fly ash raw powder supplied by the quantitative supply device 4 to the heating device and the output of the high-frequency power source (high-frequency induction heating power source 23) is adjusted.
  • the unburned carbon contained in the powder is heated. Therefore, delicate temperature adjustment of unburned carbon is possible.
  • the combustion furnace corresponds to the carbon high temperature oxidation furnace 9
  • the stirring means corresponds to the furnace body 26, the screw blades 26c, and the furnace body support portion 27,
  • the oxygen supply means corresponds to the blowing nozzle 34
  • the combustion means corresponds to the auxiliary burner 33
  • the heating device corresponds to the power heating device 8
  • the transfer tube corresponds to the heat treatment tube 21
  • the oxygen unnecessary heating means corresponds to the induction coil 22, the high frequency induction heating power source 23, the high frequency converter feeder 24, and the control device 25,
  • the induction coils correspond to the induction coil 22, the front coil 22a, the middle coil 22b, and the rear coil 22c
  • the high frequency power source corresponds to the high frequency induction heating power source 23, the power source 23a, the power source 23b, and the power source 23c.
  • the inlet corresponds to the inlet 30a
  • the discharge part corresponds to the discharge port 35
  • the ejection hole corresponds to the ejection hole 33a
  • the opening surface corresponds to the opening surface 30b, but the present invention is not limited to this embodiment, and may be various other embodiments.
  • the power heating device 8 may be a facility that can heat the fly ash raw powder packed in the heat treatment tube 21, and may be configured to be heated by providing a heater around the heat treatment tube 21.
  • an appropriate heater is arranged at the axial center position in the heat treatment tube 21, and fly ash raw powder is placed between the heater and the heat treatment tube 21.
  • the surrounding fly ash raw powder may be heated by the heat of the heater in a clogged state. Even in the case of these configurations, the fly ash raw powder can be heated in a compact manner without requiring oxygen supply.
  • the present invention can be used in industries that require firing (heat reforming) of fly ash.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • General Induction Heating (AREA)

Abstract

L'invention concerne un appareil de chauffage et de cuisson à faible coût énergétique et un procédé de cuisson pour cendres volantes. L'appareil de chauffage et de cuisson comprend un four de combustion pour brûler et réduire la quantité de carbone non brûlé dans une poudre brute comprenant des cendres volantes et du carbone non brûlé. Le four de combustion comprend : un moyen d'agitation pour agiter le carbone non brûlé dans le four; un moyen d'alimentation en oxygène pour fournir de l'oxygène dans le four; et un moyen de combustion pour brûler le combustible dans le four rempli d'oxygène fourni par le moyen d'alimentation en oxygène. Un dispositif de chauffage est prévu à un étage avant le four à combustion. L'intérêt du dispositif de préchauffage est de préchauffer le carbone non brûlé devant être fourni au four à combustion à une température de consigne de préchauffage réglée pour être supérieure au moins à 200 °C, c'est à dire à une température inférieure à la température d'allumage du carbone non brûlé
PCT/JP2017/005421 2016-07-22 2017-02-15 Appareil de chauffage et de cuisson et procédé de cuisson pour cendres volantes WO2018016108A1 (fr)

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JP7068801B2 (ja) * 2017-10-31 2022-05-17 日本製紙株式会社 フライアッシュの製造装置及び製造方法
JP7013265B2 (ja) * 2018-02-01 2022-01-31 川崎エンジニアリング株式会社 フライアッシュの加熱改質装置および加熱改質方法
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