WO2022210519A1 - 流動媒体再生装置、燃焼システム及び流動層式燃焼炉の燃焼方法 - Google Patents

流動媒体再生装置、燃焼システム及び流動層式燃焼炉の燃焼方法 Download PDF

Info

Publication number
WO2022210519A1
WO2022210519A1 PCT/JP2022/014942 JP2022014942W WO2022210519A1 WO 2022210519 A1 WO2022210519 A1 WO 2022210519A1 JP 2022014942 W JP2022014942 W JP 2022014942W WO 2022210519 A1 WO2022210519 A1 WO 2022210519A1
Authority
WO
WIPO (PCT)
Prior art keywords
medium
fluidized
fluidized bed
combustion
combustion furnace
Prior art date
Application number
PCT/JP2022/014942
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
和樹 吉田
隆一 阿川
Original Assignee
住友重機械工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友重機械工業株式会社 filed Critical 住友重機械工業株式会社
Priority to JP2023511248A priority Critical patent/JPWO2022210519A1/ja
Priority to KR1020237031549A priority patent/KR20230164666A/ko
Publication of WO2022210519A1 publication Critical patent/WO2022210519A1/ja

Links

Images

Classifications

    • 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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • 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
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
    • 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
    • F23C10/18—Details; Accessories
    • F23C10/24—Devices for removal of material from the bed
    • 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
    • F23C10/18—Details; Accessories
    • F23C10/24—Devices for removal of material from the bed
    • F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
    • 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
    • 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
    • Y02E20/12—Heat utilisation in combustion or incineration of waste

Definitions

  • the present invention relates to a fluidized medium regeneration device for a fluidized bed, a combustion system, and a combustion method for a fluidized bed combustion furnace for regenerating the fluidized medium forming the fluidized bed of the fluidized bed combustion furnace.
  • a combustion furnace for example, a fluidized bed combustion furnace
  • a combustion furnace that burns a combustion target and generates saturated steam
  • a combustion furnace that is connected to the combustion furnace and burns the saturated steam generated in the combustion furnace.
  • a circulating fluidized bed boiler hereinafter sometimes referred to as a "CFB boiler” equipped with a superheater for superheating the combustion gas generated in the furnace and using it for power generation.
  • low-grade biomass fuels such as rice husks and EFB (Empty Fruit Bunches) will be used in many cases.
  • low-grade biomass fuels and waste fuels contain many impurities such as alkaline components such as Na and K.
  • low-melting compounds hereinafter sometimes referred to as "low-melting compounds”
  • the low-melting compounds may flow. It may cause poor flow of the layer. Therefore, it is urgent and essential to expand the range of biomass fuel application to CFB boilers and to suppress poor flow in the boilers.
  • Patent Document 1 sets the air ratio in the fluidized bed to a specific range and recirculates the exhaust gas to reduce the amount of low-melting-point compounds generated in the combustion of high-alkali-containing biomass fuel.
  • the fluidized bed temperature is controlled at 600 to 750°C.
  • the low-melting point compound suppresses the agglomeration of the fluid medium (for example, bottom ash) to prevent poor fluidity, thereby enabling smooth and stable operation.
  • Patent Document 2 includes a cooling water tank that separates deposits from the fluidized medium by cooling the fluidized medium such as bottom ash extracted from the fluidized bed of the combustion furnace by putting it into water. Even with this technology, it is possible to efficiently separate deposits from the fluidized medium, but there is still room for improvement from the viewpoint of efficiently suppressing poor flow of highly alkaline-containing biomass fuel.
  • An object of the present invention is to provide a fluidized medium regenerating apparatus, a combustion system, and a combustion method for a fluidized bed combustion furnace capable of efficiently separating the coating layer from the fluidized medium in order to solve the above-described problems. .
  • the present invention is as shown below.
  • the fluidized medium recovered from the fluidized bed of the fluidized bed combustion furnace is supplied, the fluidized medium is cooled by contacting the fluidized medium with a boiling point of ⁇ 20° C. or lower under 1 atmosphere, and the fluidized medium is cooled.
  • ⁇ 4> The fluidized medium for the fluidized bed according to any one of ⁇ 1> to ⁇ 3>, wherein the temperature of the fluidized medium recovered from the fluidized bed of the fluidized bed combustion furnace is equal to or lower than the melting point of the coating layer. playback device.
  • the cooling unit further includes an intermediate cooling unit that cools the fluid medium, and the fluid medium cooled by the intermediate cooling unit is brought into contact with the liquid medium.
  • ⁇ 6> Any one of ⁇ 1> to ⁇ 5>, further comprising a return unit that recovers the fluidized medium from which the coating layer has been separated and returns the fluidized medium having a particle size adjusted to 50 to 1000 ⁇ m to the fluidized bed.
  • a combustion system comprising a fluidized bed combustion furnace and the fluidized medium regeneration device for the fluidized bed according to any one of ⁇ 1> to ⁇ 6>.
  • a combustion method for a fluidized bed combustion furnace using an alkaline component-containing fuel comprising: A fluidized medium is recovered from the fluidized bed of the fluidized bed combustion furnace, the fluidized medium recovered from the fluidized bed is brought into contact with a liquid medium having a boiling point of ⁇ 20° C. or lower under 1 atmosphere to be cooled, and the fluidized medium is cooled. separate the coating layers, A combustion method for a fluidized bed combustion furnace. ⁇ 9> The combustion method for a fluidized bed combustion furnace according to ⁇ 8>, wherein the liquid medium is at least one of liquid air and liquid nitrogen. ⁇ 10> The combustion method for a fluidized bed combustion furnace according to ⁇ 8> or ⁇ 9>, wherein the fluidized medium and the coating layer are separated.
  • ⁇ 11> The fluidized bed combustion furnace according to any one of ⁇ 8> to ⁇ 10>, wherein the fluidized medium recovered from the fluidized bed of the fluidized bed combustion furnace has a temperature equal to or lower than the melting point of the coating layer. combustion method.
  • ⁇ 12> The combustion method for a fluidized bed combustion furnace according to any one of ⁇ 8> to ⁇ 11>, wherein the fluidized medium is contacted with the liquid medium after being cooled in an intermediate cooling section.
  • ⁇ 13> The fluidized bed type according to any one of ⁇ 8> to ⁇ 12>, wherein the fluidized medium from which the coating layer has been separated is recovered, and the fluidized medium whose particle size is adjusted to 50 to 1000 ⁇ m is returned to the fluidized bed. Combustion method of combustion furnace.
  • a fluidized medium regeneration device for a fluidized bed combustion furnace that can efficiently separate the coating layer from the fluidized medium.
  • FIG. 1 is a schematic diagram showing a combustion system provided with a fluidized medium regeneration device for a fluidized bed according to a first embodiment of the present invention
  • FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating the formation mechanism of an agglomerate, (a) is a schematic diagram which shows the coating induction mechanism by an agglomerate, (b) is a schematic diagram which shows the agglomerate melting induction mechanism. It is a K 2 O—SiO 2 phase diagram.
  • FIG. 2 is a schematic diagram showing a combustion system provided with a fluidized medium regeneration device for a fluidized bed according to a second embodiment of the present invention
  • 3 is a flowchart for explaining a combustion method applicable to the combustion system and fluidized medium regeneration device in this embodiment.
  • FIG. 3 is a schematic diagram showing a combustion system provided with a fluidized medium regenerator for a fluidized bed according to another aspect of the present invention
  • this embodiment a form for carrying out the present invention (hereinafter simply referred to as "this embodiment") will be described in detail with reference to the drawings.
  • the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents.
  • the present invention can be appropriately modified and implemented within the scope of the gist thereof.
  • the same reference numerals are given to the same elements, and overlapping explanations are omitted.
  • positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings.
  • the dimensional ratios of the drawings are not limited to the illustrated ratios.
  • FIG. 1 is a schematic diagram showing a combustion system provided with a fluidized medium regeneration device for a fluidized bed according to a first embodiment of the present invention.
  • a combustion system 1 includes a fluidized bed type combustion furnace 2 which is supplied with a combustion target and burns the combustion target in the furnace, and a fluidized medium regeneration device 3. .
  • the fluidized medium regeneration device 3 is supplied with the fluidized medium Fa recovered from the fluidized bed F of the combustion furnace 2, and brings the supplied fluidized medium Fa into contact with a liquid medium LM having a boiling point of ⁇ 20° C. or lower under 1 atmosphere. It is equipped with a screw conveyer 11 that serves as a cooling section for cooling and separating the coating layer from the fluid medium Fa.
  • the fluidized medium regeneration device 3 in the first embodiment is for regenerating the fluidized medium Fa by separating a coating layer from the fluidized medium Fa such as sand collected from the fluidized bed F of the combustion furnace 2 .
  • the combustion system 1 can use alkali-containing fuels such as rice husks and EFB (Empty Fruit Bunches) high alkali-containing biomass fuels as combustion objects.
  • the high alkali content biomass fuel may be hereinafter simply referred to as "biomass fuel”.
  • the combustion system 1 comprises a combustion furnace 2 that burns biomass fuel and heats water in a closed vessel to produce steam.
  • the combustion furnace 2 is an external circulation type fluidized bed combustion furnace, a so-called CFB (Circulating Fluidized Bed) boiler.
  • a fuel inlet for charging fuel is provided in the middle of the combustion furnace 2, and biomass fuel is charged through this fuel inlet.
  • the combustion object used in the combustion system 1 is not limited to biomass fuel, and any fuel containing an alkaline component can be used without particular limitation.
  • the combustion furnace 2 is further charged with a fluidizing medium Fa such as sand containing quartz particles as a main component, and air is supplied into the fluidizing medium Fa from the lower part (bottom) of the furnace to cause the fluidizing medium Fa to flow. Then, a fluidized bed F is formed. The formation of the fluidized bed F promotes the combustion of biomass fuel. Further, the combustion gas produced as a result of the combustion of the biomass fuel rises inside the combustion furnace 2 while accompanying part of the fluid medium Fa.
  • the term "fluid medium” as used herein also includes bottom ash produced by combustion of biomass fuel.
  • bottom ash is mainly composed of a fluid medium such as sand, and includes combustion ash produced by combustion of biomass fuel and fluid medium Fa coated and agglomerated with components in biomass fuel.
  • the "coating layer” attached (including clothes), the fluid medium Fa can be regenerated so as to be reusable.
  • a coating layer when simply referred to as a “coating layer” hereinafter, it also includes mere deposits caused by the components in the biomass fuel.
  • a gas outlet 2A for discharging combustion gas is provided in the upper part of the combustion furnace 2.
  • a cyclone separator 4 functioning as a solid-gas separator is connected to the gas outlet 2A.
  • Combustion gas generated in the combustion furnace 2 is introduced into the cyclone separator 4 along with solid particles.
  • the cyclone separator 4 separates the collected solid particles from the combustion gases by centrifugal action. Collected solid particles separated from the combustion gas are returned to the combustion furnace 2 through the return line 5 .
  • the collected solid particles include fluid media such as bottom ash and sand.
  • the combustion gas from which the collected solid particles have been removed is sent to the heat recovery device 6 through the outlet 4A.
  • the return line 5 is composed of a pipeline connected to the lower part of the combustion furnace 2, and a loop seal 5A is provided in the middle.
  • the loop seal 5 ⁇ /b>A is equipment that prevents combustion gas from flowing back to the combustion furnace 2 .
  • the fluid medium Fa sent from the cyclone separator 4 is accumulated in the loop seal 5A. Further, the fluid medium Fa in the loop seal 5A is thrown into the combustion furnace 2 from the return chute portion 5B, which is the exit of the loop seal 5A.
  • the heat recovery device 6 has a boiler tube (not shown) that forms a flow path for the combustion gas and flows water as a heat medium.
  • the boiler tubes are provided so as to cross the flow path of the combustion gas within the heat recovery device 6, and recover the heat of the combustion gas sent from the cyclone separator 4 by heat exchange with the water inside the tubes.
  • high-temperature steam is generated by the recovered heat, and the steam is sent through the boiler tube to a power generation turbine (not shown) or the like.
  • the heat recovery device 6 sends the combustion gas after heat recovery to the bag filter 7 through the exhaust port 6A.
  • the bag filter 7 is filtering equipment that removes fine particles such as fly ash that are still entrained in the combustion gas.
  • the combustion gas filtered by the bag filter 7 is sucked by the suction pump 8 and discharged from the combustion system 1 through the chimney 9 .
  • the combustion furnace 2 in the process of burning the biomass fuel, part of the combustion ash and fuel generated by the combustion melts with the surrounding fluid medium Fa to form lumps.
  • This agglomerate is sometimes called "agglomerate", and when it accumulates at the bottom of the combustion furnace 2, it causes poor fluidity of the fluidized bed F. For this reason, it is necessary to remove the agglomerate together with the fluid medium Fa from the combustion furnace 2 periodically.
  • the fluidized medium Fa containing the agglomerated material is extracted from the outlet of the combustion furnace 2 and conveyed to the fluidized medium regeneration device 3 .
  • FIG. 2 is a schematic diagram for explaining the formation mechanism of aggregates.
  • agglomerates which is the main cause of poor fluidity in the fluidized bed F, is mostly due to the melt of low-melting compounds, i.e. substances formed due to alkali components in biomass fuel (for example, )) adheres to the surface of the fluidizing medium Fa, or the components in the biomass fuel chemically react on the surface of the fluidizing medium Fa, whereby the alkaline component forms a eutectic on the surface of the fluidizing medium Fa. caused.
  • two main mechanisms are known for agglomerate formation: coating-induced and melting-induced.
  • FIG. 2(a) shows the formation mechanism of aggregates X induced by coating.
  • FIG. 2(a) is a schematic diagram showing the coating induction mechanism of aggregates.
  • the coating-induced formation of agglomerate X is caused by vapors (e.g., KCl, K2SO4 , etc.) of alkaline components ( potassium, sodium, etc.) in biomass fuel (Fig. 2 ( It is caused by a chemical reaction between "N” in a) and quartz grains (sand), which is the main component of the fluid medium Fa.
  • KCl tends to vaporize at 700° C. or higher.
  • a sticky eutectic coating C (eg, K 2 O—SiO 2 : alkali silicate phase) is formed on the surface of the fluid medium Fa.
  • the fluid media Fa on which the eutectic coating C is formed repeat bonding and separation within the fluidized bed F. As shown in FIG. As a result, particle agglomeration is started, and agglomerates X are gradually formed, which act as flow impediment factors.
  • the major control factors for the coating-induced aggregate X formation mechanism are the eutectic coating thickness (ease of bonding separation), eutectic coating composition (bonding strength), and local temperature. Further, it has been confirmed that phosphorus is an important factor in the formation of aggregates X in addition to alkaline components as components contained in biomass fuel.
  • the eutectic coating C begins to melt at about 700° C. as shown in the K 2 O—SiO 2 phase diagram in FIG. Therefore, the eutectic coating C is in a molten state in a high-temperature region (a high-temperature combustion region) (approximately 700° C. to 900° C.) in the combustion furnace 2, and the fluid media Fa easily agglomerate.
  • a high-temperature combustion region approximately 700° C. to 900° C.
  • FIG. 2(b) is a schematic diagram showing the melting-induced mechanism.
  • Melting-induced agglomerates X are caused by adhesion of a melt M of a low-melting compound (alkali silicate) formed by an alkali component in the biomass fuel to the surface of the fluid medium Fa.
  • the fluid medium Fa to which the melt M adheres gradually agglomerates in the fluidized bed F to form an agglomerate X.
  • the control factors for the melting-induced formation mechanism of agglomerate X are the local temperature and fuel ash composition. In combustion ash containing high concentrations of alkaline components and chlorine, agglomerate X is formed through the melting-induced mechanism. tend to be
  • the fluidized medium regeneration device 3 includes a supply unit 10 to which the fluidized medium Fa collected from the fluidized bed F of the combustion furnace 2 is supplied, and the fluidized medium Fa supplied from the supply unit 10 , and a screw conveyor 11 that cools the fluid medium Fa by bringing it into contact with the liquid medium LM supplied from the supply pipe 11A.
  • the screw conveyor 11 serves as a cooling section for the fluid medium Fa.
  • the fluidized medium regeneration device 3 includes a sorting device 12 that sorts out the fluidized medium Fa discharged from the screw conveying machine 11 and the coating layer, and recovers the fluidized medium from which the coating layer has been separated and recovers the fluidized bed F of the combustion furnace 2. and a return mechanism 13 for returning to.
  • the supply unit 10 is connected to an outlet provided at the bottom of the combustion furnace 2 and is supplied with the fluidized medium Fa recovered from the fluidized bed F of the combustion furnace 2 .
  • the fluidized medium recovered from the combustion furnace 2 has a high temperature (for example, 700° C.) and is supplied into the screw conveyor 11 via the supply section 10 .
  • the temperature of the fluidized medium Fa collected from the fluidized bed F of the combustion furnace 2 supplied to the supply unit 10 is not particularly limited, but for example, the coating layer (deposits ) (eg, 700° C. or less when the fluid medium Fa has a coating layer of SiO 2 —K 2 O formed thereon).
  • the screw conveying machine 11 is connected to the supply unit 10 connected to the discharge port of the combustion furnace 2, and is supplied with the high-temperature fluid medium Fa extracted from the bottom of the combustion furnace 2.
  • the screw conveying machine 11 is constructed such that a screw is rotated by driving a motor indicated by "M" in the drawing, and the fluid in the apparatus can be conveyed. Further, the screw conveying machine 11 is cooled in advance, and in order to cool the screw conveying machine 11 in advance, cooling means other than the liquid medium L such as water can be used.
  • a supply pipe 11A is connected to the screw conveying machine 11, and is configured such that the liquid medium LM is supplied into the conveying path of the screw conveying machine 11 by a pump or the like (not shown).
  • the position where the liquid medium LM is supplied to the screw conveying machine 11 is not particularly limited, and the supply position of the liquid medium LM is such that the liquid medium LM comes into contact with the fluid medium Fa at an optimum location within the screw conveying machine 11. can be set.
  • the liquid medium LM may be supplied from the downstream side of the screw conveying machine 11, from the upstream side of the screw conveying machine 11, or supplied throughout the screw conveying machine 11. It may be configured as
  • the liquid medium LM is a liquid with a boiling point of -20°C or below under 1 atmosphere, and is a liquid medium capable of maintaining a low temperature below 0°C.
  • the term "liquid medium” throughout this specification includes a gaseous medium obtained by vaporizing a liquid medium.
  • the liquid medium LM include liquid air (boiling point under 1 atmosphere: about ⁇ 190° C.), liquid nitrogen (boiling point under 1 atmosphere: about ⁇ 196° C.), liquid oxygen (boiling point under 1 atmosphere: about ⁇ 183° C.), liquid hydrogen (boiling point under 1 atmosphere: about ⁇ 252.6° C.), and the like.
  • the liquid medium LM can be appropriately selected according to, for example, the fuel conditions in the combustion furnace 2 (the amount of alkaline components (eg, potassium) brought into the furnace), but the ease of handling, ease of availability, and safety etc., at least one of liquid air, liquid nitrogen and liquid oxygen is preferable.
  • the fuel conditions in the combustion furnace 2 the amount of alkaline components (eg, potassium) brought into the furnace
  • the ease of handling, ease of availability, and safety etc. at least one of liquid air, liquid nitrogen and liquid oxygen is preferable.
  • the high temperature difference in cooling shrinkage conveyed inside the screw conveying machine 11 contacts with the liquid medium LM and is rapidly cooled.
  • a fluid medium Fa (aggregate ) contacts the liquid medium LM, the fluid medium Fa and the coating layer are rapidly cooled from a high temperature state, and the coating layer is separated from the fluid medium Fa by the difference in thermal expansion (cooling shrinkage difference) between the fluid medium Fa and the coating layer. separated.
  • the separation utilizes the difference in cooling shrinkage due to the difference in material (that is, the difference in physical properties) between the coating layer (eg alkali silicate, etc.) and the induction medium (sand, etc.).
  • the temperature of the fluid medium Fa and the ratio of the liquid medium LM is preferably 120 to 410°C.
  • the fluid medium Fa and the coating layer cooled and separated in the screw conveying machine 11 are discharged from the discharge port of the conveying machine and supplied to the sorting device 12 located in the latter stage. At this time, since the liquid medium LM evaporates immediately after coming into contact with the fluid medium Fa, the separated fluid medium Fa and the coating layer are supplied to the sorting device 12 in a dry state.
  • a sieve is installed in the sorting device 12 as a sorting means, and a discharge pipe 12A and a supply pipe 12B are connected.
  • a mixture of the fluid medium Fa and the coating layer supplied from the screw conveyor 11 to the sorting device 12 through the supply pipe 12B is sorted into the fluid medium Fa and uncombustible substances such as the coating layer in the sorting device 12. .
  • the sorting device 12 sorts out the fluid medium Fa and non-combustible materials such as the coating layer with a sieve using the particle size difference between the fluid medium Fa and the coating layer.
  • the fluid medium Fa sorted by the sorting device 12 is transported to the return mechanism 13 .
  • uncombustible substances such as coating layers sorted out by the sorting device 12 are discharged out of the system through a discharge pipe 12A.
  • the mesh size of the sieve provided in the sorting device 12 is not particularly limited. Fa and the coating layer can be sorted out.
  • the sieve provided in the sorting device 12 from the viewpoint of the particle size of the fluid medium Fa, for example, based on the mesh size based on the ASTM standard (American Society for Testing and Materials), for example, 270 to 325 mesh (mesh 45 to 53 ⁇ m) can be used.
  • the sieves in the sorting device 12 may be configured in either a single stage or multiple stages.
  • the return mechanism 13 is a mechanism that recovers the fluidized medium Fa from which the coating layer has been separated and returns it to the fluidized bed. Further, the return mechanism 13 is provided with a particle size adjuster 13A for adjusting the flow of the fluid medium Fa and a return line 13B.
  • the sorted fluid medium Fa transported from the sorting device 12 to the return mechanism 13 is first supplied to the particle size adjusting device 13A.
  • the particle size adjusting device 13A is provided with a sieve as a particle size adjusting means, and adjusts the particle size of the fluid medium Fa.
  • the particle size adjustment device 13A adjusts the particle size of the fluid medium Fa to, for example, 50 to 1000 ⁇ m from the viewpoint of further removing foreign matter from the fluid medium Fa and increasing the purity (quality) of the fluid medium Fa returned to the combustion furnace 2. be able to.
  • the sieve opening provided in the particle size adjusting device 13A is not particularly limited, but in order to remove foreign matter of 1000 ⁇ m or more, the sieve opening can be set to 1000 ⁇ m or more, for example.
  • the sieve provided in the particle size adjusting device 13A from the viewpoint of the particle size of the fluid medium Fa, for example, based on the mesh size based on the ASTM standard (American Society for Testing and Materials), for example, 16 to 18 mesh ( 1000 to 1180 ⁇ m opening) can be used.
  • the sieves in the particle size adjusting device 13A may be configured either in a single stage or in multiple stages.
  • a return line 13B for returning to the fluidized bed F of the combustion furnace 2 is connected to the particle size adjusting device 13A.
  • the fluid medium Fa whose particle size has been adjusted in the particle size adjusting device 13A is discharged through the return line 13B.
  • the "a" mark indicated by the arrow of the return line 13B communicates with the "a" mark on the side of the combustion furnace 2, and the fluidized medium Fa recovered by the return mechanism 13 is transferred to the combustion furnace. It means that the fuel is returned to the fluidized bed F from the No. 2 fuel inlet.
  • the high-temperature fluidized medium Fa extracted from the bottom of the fluidized bed F of the combustion furnace 2 has a boiling point of
  • peeling of the coating layer occurs due to the shrinkage difference between the fluid medium Fa and the coating layer.
  • the difference in physical properties between the alkali silicate phase such as K 2 O—SiO 2 and the fluidizing medium Fa such as sand causes a difference in shrinkage due to rapid cooling. Separation is achieved.
  • the fluidized medium regeneration device 3 and the combustion system 1 incorporating the same physical collision is utilized by utilizing the shrinkage difference based on the difference in physical properties between the fluidized medium Fa and the coating layer.
  • the fluidized medium Fa separated from the coating layer can be recovered and returned to the fluidized bed F by the return line 13B. Therefore, the fluid medium Fa extracted from the fluidized bed F can be automatically replenished by returning it to the fluidized bed F, and labor for replenishing the fluidized medium Fa can be reduced.
  • the fluid medium regeneration device 3 and the combustion system 1 of the present embodiment particles of the fluid medium Fa can be handled in a dry state of the present embodiment. Therefore, the transportation in the sorting device 12 and the return mechanism 13 is smooth, and the recycling of the fluidized medium Fa is facilitated. can be reduced. Further, according to the fluidized medium regeneration device 3 and the combustion system 1 of the present embodiment, the fluidized medium Fa can be returned to the boiler without going through a drying process or the like. Therefore, the fluidized medium regeneration device 3 and the combustion system 1 of the present embodiment can reuse the fluidized medium advantageously from the aspects of efficiency and cost, and are capable of reusing a large amount of the fluidized medium Fa (such as sand).
  • the combustion furnace 2 can also be suitably dealt with.
  • the high-temperature fluidized medium recovered from the combustion furnace 2 is directly brought into contact with the liquid medium LM, but the present invention is not limited to this aspect.
  • the cooling unit for example, the screw conveying machine 11
  • the cooling unit may be configured to secure a certain amount of conveyance path so that the temperature of the fluid medium is lowered to some extent before contact with the liquid medium
  • the cooling unit may be further provided with an intermediate cooling unit for cooling the fluid medium, and the fluid medium cooled by the intermediate cooling unit may be brought into contact with the liquid medium.
  • FIG. 4 is a schematic diagram showing a combustion system provided with a fluidized medium regeneration device for a fluidized bed according to a second embodiment of the present invention.
  • the fluidized medium regeneration device 22 of the combustion system 21 in the second embodiment differs from the first embodiment only in that it cools the fluidized medium Fa when the fluidized medium Fa is conveyed by the screw conveyor 11. different.
  • members having the same configurations as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
  • the fluidizing medium regeneration device 22 is formed with a cooling medium flow path 23 for flowing a cooling medium such as water around the upstream portion of the screw conveyor 11 . Both ends of the cooling medium flow passage 23 are connected to circulation pipes for circulating the cooling medium, and a cooling medium tank 24 for storing the cooling medium and allowing the cooling medium to flow smoothly in the middle of this pipe.
  • a pump 26 is provided for.
  • a cooler 25 for cooling the cooling medium in the cooling medium tank 24 is provided below the cooling medium tank 24 .
  • the high-temperature fluidized medium Fa discharged from the outlet of the combustion furnace 2 transfers heat to the cooling medium in the cooling medium flow path 23 when conveyed upstream of the screw conveying machine 11. Cooled by moving.
  • the fluid medium Fa is cooled until the temperature immediately before it is introduced into the screw conveyor 11 reaches a predetermined proper temperature. Further, in the present embodiment, the supply amount of the liquid medium LM is controlled so that it is positioned around the downstream portion of the screw conveying machine 11 .
  • the temperature of the fluid medium Fa is adjusted to an appropriate temperature in the upstream portion of the screw conveying machine 11, so that the fluid medium Fa and the coating in the downstream portion of the screw conveying machine 11 Delamination of the coating layer due to the difference in contraction with the layer can be generated appropriately, and cracks in the fluid medium Fa itself due to excessively rapid cooling can be prevented.
  • the appropriate temperature is between room temperature (for example, 25° C.) and the melting point of the coating layer of the fluid medium (the coating layer is SiO 2 -K 2 O 700° C. or lower for a coating layer of .
  • the high-temperature fluid medium Fa is cooled to an appropriate temperature by the cooling medium flow path 23, and then brought into contact with the liquid medium LM. It is possible to suppress excessive evaporation of the liquid medium LM and a large change in temperature due to injection. As a result, it becomes possible to avoid situations such as supplying a large amount of the liquid medium LM in order to suppress the temperature change of the liquid medium LM and frequently adjusting the temperature inside the screw conveying machine 11. 11 can be made smaller and the operating cost can be reduced.
  • the fluid medium regeneration device 22 has the cooling medium flow path 23 installed around the upstream portion of the screw conveyor 11, but the present invention is not limited to this configuration. do not have.
  • the fluid medium regeneration device 22 may be configured such that the cooling medium flow path 23 is installed around the downstream portion of the screw conveying machine 11 and the liquid medium LM is supplied from around the upstream portion of the screw conveying machine 11. good.
  • FIG. 5 is a flowchart for explaining a combustion method applicable to the combustion system and fluidized medium regeneration device in this embodiment.
  • the combustion method for a fluidized bed combustion furnace in the present embodiment is a combustion method for a fluidized bed combustion furnace using alkaline component-containing fuel such as biomass fuel as described above.
  • an alkaline component-containing fuel such as biomass fuel is burned in a fluidized bed combustion furnace (combustion step in step S1), and a fluidized medium is recovered from the fluidized bed of the fluidized bed combustion furnace.
  • Recovery step in step S2 a step of contacting the fluidized medium recovered from the fluidized bed with a liquid medium having a boiling point of ⁇ 20° C. or lower under 1 atm to cool it, and separating the coating layer from the fluidized medium.
  • the liquid medium is not particularly limited, but can be at least one of liquid air and liquid nitrogen as described above.
  • the temperature of the fluidized medium recovered from the fluidized bed of the fluidized bed combustion furnace is preferably lower than the melting point of the coating layer of the fluidized medium.
  • the fluid medium is cooled by an intermediate cooling section (for example, the cooling medium flow path 23 in FIG. 4) and then brought into contact with the liquid medium.
  • the fluid medium and coating layer separated in the cooling separation step can be sorted in a sorting step (sorting step in step S4).
  • the fluid medium Fa and the coating layer supplied to the sorting device 12 in FIG. 1 are sorted by a sieve in the device, and unburnable materials such as the coating layer are discharged out of the system.
  • this embodiment can include a return step of recovering the fluidized medium from which the coating layer has been separated and returning the fluidized medium whose particle size has been adjusted to 50 to 1000 ⁇ m to the fluidized bed (step S6 in FIG. 5).
  • a particle size adjustment step is included prior to the returning step so that after adjusting the particle size of the collected fluid medium to 50 to 1000 ⁇ m, the fluid medium is returned to the fluidized bed. (step S5 in FIG. 5).
  • the high-temperature fluidized medium Fa extracted from the bottom of the fluidized bed F of the combustion furnace 2 has a boiling point of Efficient separation between the fluid medium and the coating layer is achieved by contact with a liquid medium of -20°C or less and rapid cooling. Therefore, quality assurance and effective utilization of the fluid medium, which is a circulating material, can be achieved.
  • the fluidized medium separated from the coating layer in the return step can be recovered and returned to the fluidized bed. It is possible to automatically replenish the liquid medium, and it is possible to reduce the labor involved in replenishing the fluid medium.
  • the fluidized medium can be smoothly conveyed in the sorting process and the return process, and recycling of the fluidized medium is facilitated. At the same time, it is possible to reduce the amount of water brought in when the fluidized medium is returned to the fluidized bed in the fluidized bed combustion furnace. Furthermore, according to the combustion method of the present embodiment, the fluidized medium can be returned to the fluidized bed combustion furnace without going through a drying process, etc., so it can be used in a large combustion furnace that uses a large amount of fluidized medium (such as sand). It is also possible to suitably deal with these problems.
  • the fluidized medium regeneration device, combustion system, and combustion method of the present invention are not limited to the above-described embodiments.
  • the present invention is applicable to fluidized bed combustion furnaces other than CFB boilers.
  • the fuel used in the combustion furnace is not limited to biomass fuel. Any fuel may be used as long as it causes a sufficient shrinkage difference between the coating layer and the fluid medium Fa.
  • the present invention can be suitably applied when using fuel containing highly alkaline components.
  • the intermediate cooling means described above is not limited to the cooling medium flow path 23 described in the second embodiment, and may be a mode that cools the fluid medium Fa by, for example, air cooling. It should be noted that the heat recovered in the cooling medium flow path 23 may be used in other equipment. Moreover, it is not always necessary to provide the return line 13B.
  • the liquid medium LM is supplied from the supply pipe 11A to the screw conveying machine 11, and the structure in which the fluid medium Fa comes into contact within the screw conveying machine 11 has been described.
  • the invention is not limited to this aspect.
  • the fluidized medium regeneration device 31 is configured such that the fluidized medium Fa conveyed from the screw conveying machine 32 is cooled by being brought into contact with the liquid medium LM in the cooling section 33, and the coating layer is separated by the cooling. be able to.
  • the screw conveyor 32 can serve as an intermediate cooling section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
PCT/JP2022/014942 2021-03-29 2022-03-28 流動媒体再生装置、燃焼システム及び流動層式燃焼炉の燃焼方法 WO2022210519A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023511248A JPWO2022210519A1 (zh) 2021-03-29 2022-03-28
KR1020237031549A KR20230164666A (ko) 2021-03-29 2022-03-28 유동매체재생장치, 연소시스템 및 유동층식 연소로의 연소방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-055332 2021-03-29
JP2021055332 2021-03-29

Publications (1)

Publication Number Publication Date
WO2022210519A1 true WO2022210519A1 (ja) 2022-10-06

Family

ID=83456335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/014942 WO2022210519A1 (ja) 2021-03-29 2022-03-28 流動媒体再生装置、燃焼システム及び流動層式燃焼炉の燃焼方法

Country Status (4)

Country Link
JP (1) JPWO2022210519A1 (zh)
KR (1) KR20230164666A (zh)
TW (1) TWI826981B (zh)
WO (1) WO2022210519A1 (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS513492B2 (zh) * 1972-10-30 1976-02-03
JPS5289459U (zh) * 1975-12-27 1977-07-04
EP0148427A2 (de) * 1983-12-24 1985-07-17 Kernforschungszentrum Karlsruhe Gmbh Verfahren zum Ablösen bzw. Entfernen von auf Oberflächen aufgebrachten Schutzbeschichtungen oder Belägen
JP2011106701A (ja) * 2009-11-13 2011-06-02 Sumitomo Heavy Ind Ltd 流動層の流動媒体再生装置及びその方法
JP2019190687A (ja) * 2018-04-20 2019-10-31 Ｊｆｅエンジニアリング株式会社 バイオマスの燃焼方法および燃焼装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005226930A (ja) 2004-02-13 2005-08-25 Kawasaki Heavy Ind Ltd バイオマス燃料焚き流動層燃焼方法及びその装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS513492B2 (zh) * 1972-10-30 1976-02-03
JPS5289459U (zh) * 1975-12-27 1977-07-04
EP0148427A2 (de) * 1983-12-24 1985-07-17 Kernforschungszentrum Karlsruhe Gmbh Verfahren zum Ablösen bzw. Entfernen von auf Oberflächen aufgebrachten Schutzbeschichtungen oder Belägen
JP2011106701A (ja) * 2009-11-13 2011-06-02 Sumitomo Heavy Ind Ltd 流動層の流動媒体再生装置及びその方法
JP2019190687A (ja) * 2018-04-20 2019-10-31 Ｊｆｅエンジニアリング株式会社 バイオマスの燃焼方法および燃焼装置

Also Published As

Publication number Publication date
JPWO2022210519A1 (zh) 2022-10-06
TWI826981B (zh) 2023-12-21
TW202244431A (zh) 2022-11-16
KR20230164666A (ko) 2023-12-04

Similar Documents

Publication Publication Date Title
US9494315B2 (en) Chemical-looping combustion method with ashes and fines removal at the oxidation zone outlet and plant using same
TW539829B (en) Processing method for high-temperature exhaust gas
US9714764B2 (en) Chemical-looping combustion method with dilute phase removal of ashes and fines in the oxidationzone and plant using same
US5320051A (en) Flyash injection system and method
US5282430A (en) Flyash injection system and method
KR20130124535A (ko) 가스 스트림으로부터 미립자 고형체를 분리하기 위한 방법
JP2014526672A (ja) 還元領域におけるアッシュと粒子の除去を含むケミカルループ燃焼方法とそれを使用するプラント
US8728207B2 (en) Method and system for separating mercury from waste gases of a cement production process
KR101460668B1 (ko) 유동상식 보일러의 연소방법, 및 유동상식 보일러
WO2022210519A1 (ja) 流動媒体再生装置、燃焼システム及び流動層式燃焼炉の燃焼方法
JP5372713B2 (ja) 流動層の流動媒体再生装置及びその方法
FI64997B (fi) Foerfarande foer tillvaratagande av vaerme ur gaser innehaollande vaermeytor nedsmutsande aemnen
JPH11173520A (ja) 流動床式熱分解方法と装置
JP4321823B2 (ja) 流動床ガス化炉の流動媒体分離装置、及び該装置を備えた流動媒体循環機構
JPH08290056A (ja) 熱ボイラにおける燃焼生成物の処理に用いた吸収剤の再生方法及びプラント
JP7270468B2 (ja) 排ガス処理装置及び排ガス処理方法
JP6654127B2 (ja) 凝集抑制方法、凝集抑制材、化合物調整方法、流動床ボイラ、及び流動物
KR102567157B1 (ko) 연소재의 처리방법 및 시스템, 그리고 석유계 연료연소 플랜트
JP2018204915A (ja) スラグ分離装置
GB2109100A (en) Rotary kiln coal gasifier with tar injection to suppress dust entrainment in gas
JP3934894B2 (ja) 流動層ガス化炉排出物の処理装置および処理方法
JPH0238172Y2 (zh)
JP2006223961A (ja) 流動層によるチャー・不燃物分離方法
FI94597C (fi) Menetelmä hienojakoisen pölyn erottamiseksi kuumasta paineenalaisesta prosessikaasusta
JP3664790B2 (ja) 流動層燃焼装置とその運転方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22780730

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023511248

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 2301006302

Country of ref document: TH

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22780730

Country of ref document: EP

Kind code of ref document: A1