WO2017135250A1 - 焼石膏処理装置及び焼石膏処理方法 - Google Patents
焼石膏処理装置及び焼石膏処理方法 Download PDFInfo
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- WO2017135250A1 WO2017135250A1 PCT/JP2017/003418 JP2017003418W WO2017135250A1 WO 2017135250 A1 WO2017135250 A1 WO 2017135250A1 JP 2017003418 W JP2017003418 W JP 2017003418W WO 2017135250 A1 WO2017135250 A1 WO 2017135250A1
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- Prior art keywords
- calcined gypsum
- wet gas
- cooling
- gas supply
- gypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/007—After-treatment of the dehydration products, e.g. aging, stabilisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/466—Conversion of one form of calcium sulfate to another
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/0285—Rotary kilns
-
- 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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/0273—Cooling with means to convey the charge on a rotary hearth
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
Definitions
- the present invention relates to a calcined gypsum processing apparatus and a calcined gypsum processing method. More specifically, the calcined gypsum is preliminarily hydrolyzed to reduce the amount of mixed water required for slurrying the calcined gypsum.
- the present invention relates to a gypsum processing apparatus and a calcined gypsum processing method (apparatus and method for treating stucco).
- a calcined gypsum or calcined plaster is produced by a calcining process in which raw gypsum such as chemical gypsum or natural gypsum is calcined alone, or different raw gypsum is mixed and heated (sintered).
- Dihydrate gypsum (CaSO 4 ⁇ 2H 2 O) which is the main component of raw material gypsum, is transferred to hemihydrate gypsum (CaSO 4 ⁇ 1 / 2H 2 O) by the firing process.
- the compound water (crystal water) content of dihydrate gypsum and hemihydrate gypsum is 20.9 wt% and 6.2 wt% (theoretical value), respectively.
- calcined gypsum obtained by the firing process contains type III anhydrous gypsum (CaSO 4 ) and the like in addition to hemihydrate gypsum.
- calcined gypsum has the property of being slurried (slurry) when added with an appropriate amount of water and kneaded, and then rapidly solidified as a dihydrate by a hydration reaction
- calcined gypsum is used in various gypsum products. Used as a raw material.
- a gypsum board is a typical product made from calcined gypsum.
- gypsum board is a mixture of calcined gypsum and water and slurried by adding an adhesion aid, hardening accelerator, foam, etc., and pouring the gypsum slurry between the upper and lower gypsum board base paper to force it.
- a board material or plate material for construction work produced by drying and cutting.
- the type III anhydrous gypsum contained in the calcined gypsum is mixed with the amount of kneaded water required for slurrying the calcined gypsum (hereinafter referred to as “amount of mixed water for calcined gypsum slurry”). Or “mixed water amount”).
- amount of mixed water for calcined gypsum slurry the amount of mixed water required for slurrying the calcined gypsum slurry.
- mixed water amount In the gypsum board manufacturing process, an increase in the amount of mixed water tends to increase the heat load of the forced drying process.
- type III anhydrous gypsum in calcined gypsum is converted to hemihydrate gypsum in advance, thereby reducing the amount of mixed water for calcined gypsum slurry, reducing the environmental burden It is desirable from the viewpoint of energy saving measures.
- a stabilization zone is provided in front of the cooling zone of the plaster plaster cooler, and the process gas of the calcining apparatus containing a relatively large amount of moisture (water vapor) is introduced into the stabilization zone together with the calcined gypsum.
- the calcined gypsum modified by supplying water or adding water in the stabilization zone is cooled in a cooling zone equipped with an air-cooled heat exchanger.
- the above-mentioned reforming technology for calcined gypsum is: (1) the type III anhydrous gypsum in calcined gypsum is converted to hemihydrate gypsum by hydrotreating the calcined gypsum, and (2) the calcined gypsum particles are more than necessary when slurried.
- the calcined gypsum is modified so as to be water-soluble without being refined, or the calcined gypsum is to be modified by both (1) and (2).
- the reaction vessel or pipe line that defines or surrounds the contact area of calcined gypsum and moisture, or the calcined gypsum after modification Moisture in the moist atmosphere is condensed on the inner surface of the transfer path and the like, and condensed water is easily generated on the inner surfaces of the reaction vessel, the pipe line, the transfer path and the like.
- the present invention has been made in view of such a problem, and the object of the present invention is to modify calcined gypsum and moisture in the calcined gypsum reforming process in which calcined gypsum is hydrotreated to modify calcined gypsum.
- An object of the present invention is to provide a calcined gypsum processing apparatus and a calcined gypsum processing method capable of reliably preventing the formation of condensed water in a contact area, a transport path of the modified calcined gypsum, and the like.
- the present invention provides a calcined gypsum processing apparatus having a water adding device for adding calcined gypsum and a stirring type cooling device having a cooling zone for cooling the calcined gypsum.
- the water adding device has a wet gas supply port for directly introducing a jet or discharge flow of wet gas containing moisture or water vapor into the cooling zone
- the cooling device has a calcined gypsum inlet for introducing the calcined gypsum into the cooling zone
- the wet gas supply port is disposed in the vicinity of the calcined gypsum inlet so that the jet or discharge flow of the wet gas contacts the calcined gypsum immediately after being introduced into the cooling zone.
- a gypsum processing apparatus is provided.
- the present invention also provides a calcined gypsum treatment method in which calcined gypsum before cooling is brought into contact with moisture and cooled by a stirring type cooling device having a cooling zone.
- a wet gas supply port for discharging or jetting a wet gas containing moisture or water vapor is disposed in the vicinity of the calcined gypsum introduction port of the cooling device, Introducing the calcined gypsum from the calcined gypsum inlet to the cooling zone of the cooling device; Introducing the wet gas directly into the cooling zone from the wet gas supply port;
- a calcined gypsum treatment characterized by bringing a wet gas jet or a discharge flow of the wet gas supply port into contact with a calcined gypsum immediately after being introduced into the cooling zone to hydrolyze the calcined gypsum in the cooling zone.
- the wet gas is directly introduced into the cooling zone of the cooling device, and the calcined gypsum is hydrotreated in the cooling zone.
- the wet gas jet or discharge flows into the cooling zone from the wet gas supply port arranged near the calcined gypsum inlet (gypsum gypsum inlet), so that the wet gas is cooled from the calcined gypsum inlet of the cooling device.
- Contact calcined gypsum immediately after being introduced into the area. Since the cooling zone of the cooling device also functions as a reforming zone in the calcined gypsum, each action of cooling and reforming simultaneously acts on the calcined gypsum in the cooling zone.
- the wet gas is directly introduced into the cooling zone, and contacts the calcined gypsum in the cooling zone (therefore, the wet gas is transferred in the transport path of the calcined gypsum and the like. Does not contact calcined gypsum). For this reason, it can prevent reliably that dew condensation water produces
- the contact area of calcined gypsum and moisture It is possible to reliably prevent the formation of dew condensation water on the calcined gypsum transport path and the like.
- FIG. 1A is a side view showing the overall configuration of the calcined gypsum processing apparatus
- FIG. 1B is a cross-sectional view of the calcined gypsum processing apparatus taken along line II in FIG. 1A
- 1 (C) is a rear view of the calcined gypsum processing apparatus.
- FIG. 2 is a cross-sectional view schematically showing main components of the calcined gypsum processing apparatus.
- FIG. 3 is a longitudinal sectional view schematically showing main components of the calcined gypsum processing apparatus.
- FIG. 4 is a perspective view schematically showing the form of the calcined gypsum dressing inlet and the wet gas supply port visually recognized from the cooling zone.
- FIG. 4 is a perspective view schematically showing the form of the calcined gypsum dressing inlet and the wet gas supply port visually recognized from the cooling zone.
- FIG. 5 is a schematic perspective view similar to FIG. 4 showing a modification of the wet gas supply port.
- FIG. 6 is a cross-sectional view conceptually showing the position of the wet gas supply port.
- FIG. 7A is a cross-sectional view conceptually showing a configuration in which the position of the calcined gypsum inlet is deviated from the center of the cooling zone, and
- FIG. 7B is a drawing of the calcined gypsum inlet from the end wall. It is sectional drawing which shows notionally the structure arrange
- FIG. 8 is a cross-sectional view conceptually showing a configuration in which the calcined gypsum inlet is arranged on the inner peripheral wall surface of the shell.
- FIG. 9 is a schematic cross-sectional view of a wet gas supply port and a calcined gypsum inlet showing a modification of the wet gas supply port shown in FIG.
- the wet gas is a high-temperature and high-humidity gas generated in the baking apparatus for baking the calcined gypsum and separated from the calcined gypsum
- the calcined gypsum feed pipe for feeding the calcined gypsum includes: A wet gas feed pipe connected to a calcined gypsum supply device including a calcined gypsum introduction port for feeding a hot and humid gas separated from the calcined gypsum communicates with the wet gas supply port.
- the calcined gypsum inlet has a circular contour
- the wet gas supply port has a plurality of annular openings concentrically surrounding the calcined gypsum inlet, or a plurality of rings arranged around the calcined gypsum inlet. Of the opening.
- the wet gas supply port directs the jet or discharge flow of the wet gas in a direction substantially parallel to the central axis of the calcined gypsum inlet or in a direction approaching the central axis of the calcined gypsum inlet. Oriented.
- the cooling device is an inner tube rotary type multi-tube cooling device having an air-cooled heat exchanger.
- the cooling device includes a rotary stirring type cylindrical shell that forms a cooling zone, and an air-cooled heat exchanger that uses air at ambient temperature as a cooling medium.
- the rotation center axis of the shell is inclined at a predetermined angle with respect to the horizontal plane and extends in the lateral direction.
- the calcined gypsum inlet (calcined gypsum inlet) is arranged at the base end or one end of the shell, and the calcined gypsum introduced into the cooling zone corresponds to the slope gradient of the shell. Move to.
- the calcined gypsum supply device is a screw feeder type calcined gypsum supply device having a screw part that is rotationally driven and extruding the calcined gypsum toward the calcined gypsum inlet.
- a wet gas supply device constituting the hydration device is disposed so as to surround the cylindrical housing of the screw portion.
- An annular wet gas flow path that connects the wet gas supply pipe to the wet gas supply port is formed in the outer peripheral region of the screw portion.
- the calcined gypsum inlet is open to an end wall on the proximal side (upstream in the gradient direction) of the shell and is arranged concentrically with the central axis of the shell, and the wet gas supply port is also located on the proximal side of the shell. Open in the end wall.
- the position of the wet gas supply port is preferably a circular area having a radius of 1.5 ⁇ (or 1 m) centered on the center ( ⁇ ) of the calcined gypsum inlet or the diameter or maximum dimension ⁇ of the calcined gypsum inlet or It is arranged within a hemispherical region, preferably within a circular region or a hemispherical region having a radius ⁇ (or 65 cm), so that reliable and smooth mixing contact between the wet gas and calcined gypsum is achieved.
- the wet gas is saturated steam, superheated steam, a mixture of steam and air, or a gas containing moisture at a predetermined weight ratio or more.
- superheated steam is a kind of dry gas, but it is considered that as a result of a rapid temperature drop and pressure drop immediately after flowing into the cooling zone, it changes into a state in which moisture can be released.
- superheated steam is included in the wet gas.
- the wet gas has a moisture content within a range of 0.1 to 2.0 kg / kg ′, and a mass ratio of 0.3 to 6.0 wt% with respect to calcined gypsum introduced into the cooling zone. It is introduced into the cooling zone at a flow rate of a ratio.
- the wet gas flows into the cooling zone from the wet gas supply port at a flow rate in the range of 5 to 25 m / s.
- the wet gas is water vapor (or superheated steam) such as process steam used or shared in the factory or plant where the calcined gypsum processing apparatus is installed, or steam and It is an air-fuel mixture.
- FIG. 1A is a side view showing the overall configuration of the calcined gypsum processing apparatus
- FIG. 1B is a cross-sectional view of the calcined gypsum processing apparatus taken along line II in FIG. 1A
- 1 (C) is a rear view of the calcined gypsum processing apparatus.
- the calcined gypsum processing apparatus is an inner tube rotary type multi-tube in which a large number of cooling pipes 2 constituting an air-cooled heat exchanger are arranged in a cylindrical shell (shell body) 3.
- a cooling device 1 (hereinafter referred to as “cooling device 1”).
- the cooling device 1 includes a screw feeder type calcined gypsum supply device 10 that supplies the calcined gypsum G to the cooling zone D of the cooling device 1.
- the calcined gypsum treatment apparatus further directly introduces a wet gas S containing a relatively large amount of water or a wet gas S (hereinafter referred to as “wet gas S”) such as steam or water vapor into the cooling zone D directly.
- the wet gas supply device 20 is provided.
- the central axis XX of the cooling device 1 is inclined at a predetermined angle with respect to the horizontal floor surface or the ground surface J (horizontal plane), and is introduced into the shell 3 at the base end portion 3 a of the shell 3.
- the relatively high temperature and unmodified calcined gypsum G moves to the tip 3b according to the inclination gradient of the shell 3, and is discharged from the outlet 4 of the tip 3b as cooled and modified calcined gypsum Ga.
- the cooling device 1 includes a rotation drive device 5 (schematically shown by phantom lines) that rotates the shell 3 about the central axis XX.
- the rotation drive device 5 rotates the shell 3 at a predetermined rotational speed, and the cooling zone D in the shell 3 moves the calcined gypsum G toward the tip 3b while stirring the calcined gypsum G in the shell 3.
- the cooling pipe 2 extends in parallel with the central axis XX in the cooling zone D and rotates integrally with the shell 3.
- the tip 2b of the cooling pipe 2 is opened to the atmosphere at the tip of the shell 3 as shown in FIG.
- the exhaust manifold 6 is connected to the base end portion 3 a of the shell 3, and the base end portion 2 a of the cooling pipe 2 opens into the flow path of the exhaust manifold 6.
- the exhaust manifold 6 is connected to an exhaust fan (or exhaust blower) Eb through an exhaust pipe Ea.
- the suction pressure of the exhaust fan Eb acts on the in-pipe region and the tip 2b of each cooling pipe 2 via the exhaust pipe Ea and the exhaust manifold 6, and each cooling pipe 2 passes from the tip 2b to outside air (outside air).
- the outside air flowing into the cooling pipe 2 flows through the cooling pipe 2 and flows into the exhaust manifold 6 and is exhausted outside the system by the exhaust fan Eb.
- the outside air flowing in the cooling pipe 2 exchanges heat with the calcined gypsum G in the cooling zone D via the pipe wall of the cooling pipe 2 to cool the calcined gypsum G. That is, the cooling pipe 2 constitutes an air-cooled heat exchanger using the outside air as a cooling medium, and the outside air (atmosphere) after the temperature rise is exhausted outside the system via the exhaust manifold 6.
- the exhaust port 7 for exhausting the atmospheric gas in the shell 3 is disposed at the top of the tip 3b.
- the exhaust port 7 is connected to an exhaust fan or an exhaust blower Fb through an exhaust passage Fa.
- the suction pressure of the exhaust fan Fb acts on the cooling zone D through the exhaust pipe Fa and the exhaust port 7, and the atmospheric gas in the cooling zone D is exhausted outside the system by the exhaust fan Fb.
- a dust removing device Fc shown in phantom
- a bag filter is interposed in the exhaust pipe Fa.
- the cylindrical casing 11 of the calcined gypsum supply device 10 passes through the exhaust manifold 6 and is connected to the base end portion 3a.
- the calcined gypsum supply device 10 includes a driving device 12 such as an electric motor, a screw portion 14 connected in series to a rotary drive shaft 13 of the driving device 12, and a hopper-shaped charging portion into which a relatively high-temperature calcined gypsum G is charged. 15 and a calcined gypsum charging inlet 16 having a circular outline that opens into the cooling zone D and feeds the calcined gypsum G into the cooling zone D.
- the calcined gypsum inlet 16 constitutes the above-mentioned “calcined gypsum inlet” through which the calcined gypsum G is introduced into the cooling zone D.
- the central axes of the screw portion 14 and the calcined gypsum inlet 16 substantially coincide with the central axis XX of the shell 3.
- a calcined gypsum feed pipe 17 is connected to the input unit 15.
- the calcined gypsum feed pipe 17 is connected to a calcining device (not shown) that calcines the raw gypsum.
- the calcined gypsum G of the calcining apparatus is supplied to the screw unit 14 via the calcined gypsum feed pipe 17 and the charging unit 15.
- the rotating screw part 14 pushes the calcined gypsum G from the calcined gypsum inlet 16 to the cooling zone D, and the calcined gypsum G is introduced into the cooling zone D as indicated by the arrows.
- the wet gas supply device 20 supplies the required wet gas directly to the cooling zone D in order to modify the calcined gypsum G by hydration.
- the modification of the calcined gypsum G by the hydrolysis treatment is for reducing the amount of the kneaded water for calcining gypsum slurry or preventing the amount of the kneaded water for calcining gypsum slurry from increasing.
- FIG. 2 and 3 are a transverse sectional view and a longitudinal sectional view schematically showing main components of the calcined gypsum processing apparatus.
- 4 is a schematic perspective view showing the configuration of the calcined gypsum loading inlet 16 and the wet gas supply port 22 visually recognized from the cooling zone D, and FIG. It is the same schematic perspective view.
- the wet gas supply device 20 includes a cylindrical casing 21 that surrounds the casing 11 of the calcined gypsum supply apparatus 10 and a calcined gypsum inlet 16 that surrounds the calcined gypsum inlet 16. And an annular wet gas supply port 22 arranged on the outside.
- An annular wet gas flow path 25 communicating with the wet gas supply port 22 is formed between the housing 21 and the housing 11.
- a wet gas feed pipe 23 is connected to the housing 21 so as to introduce the wet gas S into the wet gas flow path 25.
- the upstream end of the wet gas supply pipe 23 is connected to a wet gas supply source (not shown).
- wet gas S wet air or a humid gas (process gas of the calciner) generated in a calciner (not shown), water vapor such as process steam shared by the entire manufacturing facility, or a mixture of water vapor and air, etc.
- a baking apparatus is used as a wet gas supply source
- high-temperature and high-humidity gas (process gas) generated in the baking furnace or reaction vessel of the baking apparatus is removed from the calcined gypsum by a dust removing device (not shown) such as a filter unit.
- the wet gas S is fed as a wet gas S through a flow path or a pipe in the wet gas feed pipe 23 and supplied to the wet gas flow path 25.
- the flow of air (cooling medium) flowing through the cooling pipe 2 is indicated by a thin solid line arrow (Air).
- Air the flow direction of the calcined gypsum G that has been input to the input unit 15 is indicated by a thick white arrow (G), and the flow of the wet gas S that has been supplied to the wet gas supply device 20. The direction is indicated by a thick black arrow (S).
- the air having an atmospheric temperature T1 (for example, 20 ° C.) that flows into each cooling pipe 2 is heat-exchanged with the calcined gypsum G in the cooling zone D, and is heated to a temperature T2 (for example, 60 ° C.).
- the heated air flows into the exhaust manifold 6 and is exhausted outside the system by the exhaust fan Eb (FIG. 1) as described above.
- the temperature (article temperature) T3 of the calcined gypsum G charged into the calcined gypsum supply device 10 is about 150 ° C., for example.
- the calcined gypsum G is cooled by exchanging heat with the air flowing through the cooling pipe 2.
- the temperature T4 of the calcined gypsum Ga discharged from the discharge port 4 is about 80 ° C., for example.
- the temperature T5 of the wet gas S supplied to the wet gas supply device 20 is preferably a temperature in the range of 100 to 200 ° C., for example, about 150 ° C.
- the wet gas S is jetted or discharged from the wet gas supply port 22 to the cooling zone D. That is, the wet gas S is introduced directly into the cooling zone D.
- the wet gas S has a moisture content (absolute humidity) in the range of 0.1 to 2.0 kg / kg ′, and a mass ratio of 0.3 to 2.0 with respect to calcined gypsum introduced into the cooling zone. It is introduced into the cooling zone at a flow rate ratio in the range of 6.0 wt%.
- the wet gas S supplies water of 500 to 1500 kg / h (1 to 3 wt%) to the cooling zone D.
- the wet gas S flows into the cooling zone D from the wet gas supply port 22 at a flow rate in the range of 5 to 25 m / s (for example, a flow rate of 10 m / s or 20 m / s).
- the fired gypsum G is agitated in the cooling zone D by the rotation of the shell 3, and the wet gas S flowing into the cooling zone D comes into rapid and efficient mixing contact with many of the gypsum particles of the calcined gypsum G.
- the calcined gypsum G absorbs or absorbs moisture in the wet gas S, and can reduce the amount of mixed water for calcined gypsum slurry (or prevent increase in the amount of mixed water for calcined gypsum slurry). Then, it is reformed into physical properties or properties, and is discharged out of the machine from the outlet 4 in such a modified state.
- FIG. 4 shows the structure and positional relationship of the calcined gypsum inlet 16 and the wet gas supply port 22.
- the calcined gypsum inlet 16 and the wet gas supply port 22 both open to the end wall 8 of the cooling zone D.
- the calcined gypsum inlet 16 is an opening having a circular (true circular) contour having a diameter ⁇ .
- the wet gas supply port 22 is an annular opening concentrically arranged in the outer peripheral region of the calcined gypsum inlet 16, and extends in a band shape and an annular shape around the central axis XX as a band-shaped opening having a width ⁇ .
- An annular buffer band 9 is formed between the outer peripheral edge of the calcined gypsum inlet 16 and the inner peripheral edge of the wet gas supply port 22.
- the width ⁇ of the buffer zone 9 can be preferably set to a value within the range of ⁇ ⁇ 0.3 to 3.0 (preferably a value within the range of ⁇ ⁇ 0.5 to 2.5) with respect to the width ⁇ of the wet gas supply port 22. .
- the wet gas supply port 22 directly discharges or jets the jet or discharge flow of the wet gas S to the cooling zone D, there is a possibility that moisture (water vapor) in the wet gas S may be condensed in the transport path of the calcined gypsum G. Therefore, it is possible to reliably prevent the generation of condensed water in the transport path of the calcined gypsum G. Further, since the wet gas supply port 22 discharges or jets the wet gas S in the vicinity of the calcined gypsum inlet 16, the wet gas S reliably and smoothly mixes and contacts the gypsum particles of the calcined gypsum G.
- the wet gas supply port 22 shown in FIG. 4 is an annular and belt-like opening extending around the calcined gypsum inlet 16.
- a large number of wet gas supply ports 22 may be distributed around the calcined gypsum inlet 16.
- FIG. 5 shows a large number of wet gas supply ports 22 distributed at equal intervals around the calcined gypsum inlet 16 as a relatively small-diameter circular opening.
- the wet gas supply port 22 shown in FIG. 5 is connected to a branch pipe 23a formed by branching the wet gas feed pipe 23, respectively. Each wet gas supply port 22 simultaneously discharges or jets a jet or discharge flow of the wet gas S into the cooling zone D.
- FIG. 6 is a cross-sectional view conceptually showing the position of the wet gas supply port 22.
- the wet gas supply port 22 is shown as a large number of small-diameter openings dispersedly arranged as shown in FIG. 5, but the wet gas supply port 22 is an annular opening shown in FIG. Other forms of openings may also be used.
- the wet gas supply port 22 is arranged in the vicinity of the calcined gypsum loading inlet 16.
- the wet gas supply port 22 is preferably within a circular region with a radius of 1.5 ⁇ centered on the center ⁇ of the calcined gypsum inlet 16, and Preferably, it arrange
- the wet gas supply port 22 can be disposed at a position protruding from the end wall 8 as indicated by a broken line in FIG.
- the wet gas supply port 22 is preferably within a hemispherical region having a radius of 1.5 ⁇ centered on the center ⁇ of the calcined gypsum inlet port 16, and more preferably a hemispherical shape having a radius ⁇ . Arranged within the area.
- FIG. 7A is a sectional view conceptually showing a preferable position of the wet gas supply port 22 in the cooling device 1 in which the central axis X′-X ′ of the calcined gypsum inlet 16 is deviated from the central axis XX. It is.
- FIG. 7B is a cross-sectional view conceptually showing a preferable position of the wet gas supply port 22 in the cooling device 1 having a configuration in which the calcined gypsum charging inlet 16 is disposed at a position drawn from the end wall 8. It is.
- the central axis X′-X ′ of the calcined gypsum inlet 16 can be arranged at a position deviated from the central axis XX as shown in FIG.
- the calcined gypsum entrance 16 is disposed at a position where the end wall 8 is partially retracted toward the base end and the calcined gypsum entrance 16 is retracted from the position of the end wall 8 as shown in FIG. 7B. You may do it.
- the wet gas supply port 22 is preferably within a circular or hemispherical region having a radius of 1.5 ⁇ centered on the center ⁇ of the gypsum loading inlet 16, and more preferably having a radius ⁇ . Arranged within a circular or hemispherical region.
- FIG. 8 is a cross-sectional view conceptually showing the position of the wet gas supply port 22 in the cooling device 1 in which the calcined gypsum loading inlet 16 is arranged on the inner peripheral wall surface of the shell 3.
- the wet gas supply port 22 is preferably within a circular region or hemispherical region having a radius of 1.5 ⁇ centered on the center ⁇ of the calcined gypsum inlet port 16, and more preferably, the radius ⁇ . Are arranged within a circular region or a hemispherical region.
- FIG. 9 is a cross-sectional view showing a modification of the wet gas supply port 22 shown in FIG.
- the direction of the straight flow of the wet gas discharged or ejected by the wet gas supply port 22 does not necessarily have to be parallel to the central axes XX and X′-X ′.
- the central axis of the wet gas supply port 22 is As shown in FIG. 9, it may be oriented in a direction that forms a predetermined angle ⁇ with respect to the central axes XX, X′-X ′.
- the angle ⁇ is set so that the wet gas straight flow jetted by the wet gas supply port 22 is discharged or jetted in a direction approaching the central axes XX and X′-X ′.
- the cooling device is a rotary stirring type cooling device that stirs the calcined gypsum in the shell by rotating the shell, but the cooling device is a paddle stirring type, a screw stirring type, or a disk stirring type. Other types of cooling devices may be used.
- the wet gas is exemplified as the wet gas of the baking apparatus, the process steam, and the like.
- the wet gas is not limited to the wet gas of such a source.
- Wet gas from any source can be used, such as wet gas discharged from a predrying oven, wet gas discharged from a gypsum product dryer, and the like.
- the calcined gypsum calcined by the calcining device is immediately cooled by the cooling device, and the cooling zone is used as a modified gypsum for the calcined gypsum.
- the calcined gypsum may not necessarily be immediately after firing, for example, calcined gypsum after cooling to a certain level.
- the cooling device may be configured as a cooling / drying device, and the cooling region may be configured as a cooling / drying region in which the calcined gypsum that has already been cooled to a certain degree is further cooled and dried.
- the present invention is applied to a calcined gypsum treating apparatus and a calcined gypsum treating method, in particular, to a calcined gypsum treating apparatus and a calcined gypsum treating method for supplying moisture to the calcined gypsum and hydrotreating the calcined gypsum.
- the present invention in the reforming process in which calcined gypsum is hydrolyzed and reformed, it is ensured that condensed water is generated in the calcined gypsum and moisture contact area, the modified calcined gypsum transport path, and the like. Since it can prevent and improve the efficiency of the hydrotreatment of calcined gypsum, its practical effect is remarkable.
- Cooling device 2 Cooling pipe 3 Cylindrical shell 4 outlet 5 Rotation drive 6 Exhaust manifold 7 Exhaust port 10 Burned gypsum supply device 11 Cylindrical housing 14 Screw part 16 Burning gypsum entrance 20 Wet gas supply device 21 Cylindrical housing 22 Wet gas supply port 25 Wet gas flow path D Cooling zone G calcined gypsum (before modification) Ga calcined gypsum (after modification) S Wet gas XX, X'-X 'center axis
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Abstract
Description
前記加水装置は、水分又は水蒸気を含む湿潤ガスの噴流又は吐出流を前記冷却域に直に導入する湿潤ガス供給口を有し、
前記冷却装置は、前記焼石膏を前記冷却域に導入する焼石膏導入口を有し、
前記湿潤ガス供給口は、前記冷却域に導入された直後の焼石膏に前記湿潤ガスの噴流又は吐出流が接触するように、前記焼石膏導入口の近傍に配置されることを特徴とする焼石膏処理装置を提供する。
水分又は水蒸気を含む湿潤ガスを吐出し又は噴射する湿潤ガス供給口を前記冷却装置の焼石膏導入口の近傍に配置し、
前記焼石膏を前記焼石膏導入口から前記冷却装置の冷却域に導入し、
前記湿潤ガスを前記湿潤ガス供給口から前記冷却域に直に導入し、
前記冷却域に導入された直後の焼石膏に対して前記湿潤ガス供給口の湿潤ガスの噴流又は吐出流を接触せしめて、該冷却域において焼石膏を加水処理することを特徴とする焼石膏処理方法を提供する。
2 冷却管
3 円筒状シェル
4 排出口
5 回転駆動装置
6 排気マニホールド
7 排気口
10 焼石膏供給装置
11 円筒状筐体
14 スクリュー部
16 焼石膏装入口
20 湿潤ガス供給装置
21 円筒状筐体
22 湿潤ガス供給口
25 湿潤ガス流路
D 冷却域
G 焼石膏(改質前)
Ga 焼石膏(改質後)
S 湿潤ガス
X-X、X'-X' 中心軸線
Claims (16)
- 焼石膏に加水する加水装置と、焼石膏を冷却する冷却域を備えた攪拌式の冷却装置とを有する焼石膏処理装置において、
前記加水装置は、水分又は水蒸気を含む湿潤ガスの噴流又は吐出流を前記冷却域に直に導入する湿潤ガス供給口を有し、
前記冷却装置は、前記焼石膏を前記冷却域に導入する焼石膏導入口を有し、
前記湿潤ガス供給口は、前記冷却域に導入された直後の焼石膏に前記湿潤ガスの噴流又は吐出流が接触するように、前記焼石膏導入口の近傍に配置されることを特徴とする焼石膏処理装置。 - 前記湿潤ガスは、前記焼石膏を焼成する焼成装置において生成し且つ前記焼石膏から分離された高温多湿ガスであり、前記冷却装置は、焼石膏導入口を含む焼石膏供給装置を有し、前記焼石膏を給送する焼石膏給送管が、前記焼石膏供給装置に接続され、前記高温多湿ガスを給送する湿潤ガス給送管が、前記湿潤ガス供給口と連通することを特徴とする請求項1に記載の焼石膏処理装置。
- 前記冷却装置は、前記冷却域を形成する回転攪拌式の円筒状シェルと、空気を冷熱媒体とした空冷式熱交換器とを有する多管式冷却装置であり、前記シェルの回転中心軸線は、水平面に対して所定角度をなして傾斜して横方向に延び、前記焼石膏導入口は、前記シェルの基端部又は一端部に配置され、前記冷却域に導入された焼石膏は、前記シェルの傾斜勾配に従って該シェルの先端部又は他端部に移動することを特徴とする請求項1又は2に記載の焼石膏処理装置。
- 前記湿潤ガス供給口は、前記焼石膏導入口の直径又は最大寸法(α)に対し、前記焼石膏導入口の中心(β)を中心とした半径1.5αの円形領域又は半球形領域の範囲内に配置されることを特徴とする請求項1乃至3のいずれか1項に記載の焼石膏処理装置。
- 前記焼石膏導入口は、円形輪郭を有し、前記湿潤ガス供給口は、前記焼石膏導入口を同心状に囲む環状の開口部、或いは、前記焼石膏導入口の周囲に環状に配列された複数の開口部からなることを特徴とする請求項1乃至4のいずれか1項に記載の焼石膏処理装置。
- 前記焼石膏供給装置は、回転駆動されるスクリュー部を有し且つ前記焼石膏導入口に向かって焼石膏を押出すスクリューフィーダー式の焼石膏供給装置であり、前記加水装置は、前記スクリュー部の円筒状筐体を囲むように配置された湿潤ガス供給装置を有し、該湿潤ガス供給装置は、前記湿潤ガス給送管を前記湿潤ガス供給口と連通させる湿潤ガス流路を有し、該湿潤ガス流路は、前記スクリュー部の外周域に形成された環状断面の流路であることを特徴とする請求項2に記載の焼石膏処理装置。
- 前記湿潤ガス供給口は、前記焼石膏導入口の中心軸線と実質的に平行な方向、或いは、該中心軸線に接近する方向に前記噴流又は吐出流を差し向けるように配向されることを特徴とする請求項1乃至6のいずれか1項に記載の焼石膏処理装置。
- 冷却前の焼石膏を水分と接触させるとともに、冷却域を有する攪拌式の冷却装置によって焼石膏を冷却する焼石膏処理方法において、
水分又は水蒸気を含む湿潤ガスを吐出し又は噴射する湿潤ガス供給口を前記冷却装置の焼石膏導入口の近傍に配置し、
前記焼石膏を前記焼石膏導入口から前記冷却装置の冷却域に導入し、
前記湿潤ガスを前記湿潤ガス供給口から前記冷却域に直に導入し、
前記冷却域に導入された直後の焼石膏に対して前記湿潤ガスの噴流又は吐出流を接触せしめて、該冷却域において焼石膏を加水処理することを特徴とする焼石膏処理方法。 - 前記湿潤ガスは、前記焼石膏を焼成する焼成装置において生成し且つ前記焼石膏から分離された高温多湿ガス又は水蒸気であり、前記焼石膏は、前記焼石膏導入口を有する焼石膏供給装置に対して焼石膏給送管で給送され、前記焼石膏から分離した前記高温多湿ガス又は水蒸気は、湿潤ガス給送管によって前記湿潤ガス供給口に給送されることを特徴とする請求項8に記載の焼石膏処理方法。
- 前記冷却装置は、前記冷却域を形成する回転攪拌式の円筒状シェルと、空気を冷熱媒体とした空冷式熱交換器とを有し、前記シェルの回転中心軸線は、水平面に対して所定角度をなして傾斜して横方向に延び、前記焼石膏導入口は、前記シェルの基端部又は一端部に配置され、前記冷却域に導入された焼石膏は、前記シェルの傾斜勾配に従って該シェルの先端部又は他端部に移動することを特徴とする請求項8又は9に記載の焼石膏処理方法。
- 前記湿潤ガス供給口は、前記焼石膏導入口の中心軸線と実質的に平行な方向、或いは、該中心軸線に接近する方向に前記噴流又は吐出流を差し向けることを特徴とする請求項8乃至10のいずれか1項に記載の焼石膏処理方法。
- 前記湿潤ガス供給口は、前記焼石膏導入口を同心状に囲む環状の開口部、或いは、前記焼石膏導入口の周囲に環状に配列された複数の開口部からなり、前記噴流又は吐出流は、前記焼石膏導入口を全体的に囲むように前記冷却域に流入することを特徴とする請求項8乃至11のいずれか1項に記載の焼石膏処理方法。
- 前記焼石膏供給装置は、回転駆動されるスクリュー部を有するスクリューフィーダー式の焼石膏供給装置であり、前記湿潤ガス供給口を有する湿潤ガス供給装置が、前記スクリュー部の円筒状筐体を囲むように配置され、前記湿潤ガス給送管を前記湿潤ガス供給口と連通させる環状の湿潤ガス流路が、前記円筒状筐体の外周域に形成され、前記湿潤ガスは、前記湿潤ガス流路を介して前記湿潤ガス供給口に給送されることを特徴とする請求項9に記載の焼石膏処理方法。
- 前記湿潤ガスは、飽和水蒸気、過熱水蒸気、水蒸気及び空気の混合気、或いは、所定重量比以上の水分を含有する気体であることを特徴とする請求項8乃至13のいずれか1項に記載の焼石膏処理方法。
- 前記湿潤ガスは、0.1~2.0kg/kg’の範囲内の水分量を有し、前記冷却域に導入される焼石膏に対して質量比0.3~6.0wt%の比率の流量で前記冷却域に導入されることを特徴とする請求項8乃至14のいずれか1項に記載の焼石膏処理方法。
- 前記湿潤ガスは、5~25m/sの範囲内の流速で前記湿潤ガス供給口から前記冷却域に流入することを特徴とする請求項8乃至15のいずれか1項に記載の焼石膏処理方法。
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- 2017-01-31 KR KR1020187021231A patent/KR102454646B1/ko active IP Right Grant
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Cited By (16)
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US10974993B2 (en) * | 2016-02-02 | 2021-04-13 | Yoshino Gypsum Co., Ltd. | Calcined gypsum treatment device and calcined gypsum treatment method |
RU2749019C1 (ru) * | 2018-04-02 | 2021-06-03 | Йосино Джипсум Ко., Лтд. | Многотрубный ротационный теплообменник |
CN112005072A (zh) * | 2018-04-02 | 2020-11-27 | 吉野石膏株式会社 | 多管式旋转型换热器 |
KR20200139133A (ko) | 2018-04-02 | 2020-12-11 | 요시노 셋고 가부시키가이샤 | 다관식 회전형 열교환기 |
JPWO2019193957A1 (ja) * | 2018-04-02 | 2021-04-22 | 吉野石膏株式会社 | 多管式回転型熱交換器 |
JP7194456B2 (ja) | 2018-04-02 | 2022-12-22 | 吉野石膏株式会社 | 多管式回転型熱交換器 |
EP3779344A4 (en) * | 2018-04-02 | 2022-01-19 | Yoshino Gypsum Co., Ltd. | ROTARY HEAT EXCHANGER WITH MULTIPLE PIPELINES |
WO2019193957A1 (ja) | 2018-04-02 | 2019-10-10 | 吉野石膏株式会社 | 多管式回転型熱交換器 |
CN112005072B (zh) * | 2018-04-02 | 2022-03-25 | 吉野石膏株式会社 | 多管式旋转型换热器 |
AU2019248034B2 (en) * | 2018-04-02 | 2022-04-07 | Yoshino Gypsum Co., Ltd. | Multitubular rotary heat exchanger |
US11300357B2 (en) | 2018-04-02 | 2022-04-12 | Yoshino Gypsum Co., Ltd. | Multitubular rotary heat exchanger |
KR102552265B1 (ko) | 2018-04-02 | 2023-07-06 | 요시노 셋고 가부시키가이샤 | 다관식 회전형 열교환기 |
JP6683339B1 (ja) * | 2019-03-22 | 2020-04-15 | ポリマーアソシエイツ合同会社 | 耐チッピング及び圧縮強度に優れた石膏成形体及びその製造方法 |
CN113967957A (zh) * | 2021-10-26 | 2022-01-25 | 昆明理工大学 | 废石膏除杂转晶一体化挤出式3d打印喷头及方法 |
CN113967957B (zh) * | 2021-10-26 | 2022-10-25 | 昆明理工大学 | 废石膏除杂转晶一体化挤出式3d打印喷头及方法 |
WO2023237230A1 (en) | 2022-06-08 | 2023-12-14 | Knauf Gips Kg | Extruder for producing gypsum moulded articles, process for manufacturing gypsum-based articles and gypsum-based articles |
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Publication number | Publication date |
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AU2017214993A1 (en) | 2018-08-09 |
KR102454646B1 (ko) | 2022-10-14 |
US10974993B2 (en) | 2021-04-13 |
US20190016633A1 (en) | 2019-01-17 |
KR20180111811A (ko) | 2018-10-11 |
SA518392093B1 (ar) | 2022-03-09 |
CN108698925B (zh) | 2021-06-15 |
JP6794380B2 (ja) | 2020-12-02 |
PH12018501553A1 (en) | 2019-05-20 |
PH12018501553B1 (en) | 2019-05-20 |
AU2017214993B2 (en) | 2020-12-03 |
CA3012594C (en) | 2023-01-03 |
JPWO2017135250A1 (ja) | 2018-11-29 |
CN108698925A (zh) | 2018-10-23 |
CA3012594A1 (en) | 2017-08-10 |
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