JP2008224154A - Metal recovery method for combustion facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively recover valuable metal with high concentration in burning raw material of low quality such as heavy oil and petrokokes containing plenty of metal. <P>SOLUTION: A method for burning raw material containing plenty of metal in a combustion facility to recover metal from combustion exhaust gas comprises supplying the combustion exhaust gas 2 to a main separator 5 to separate the combustion exhaust gas into a flow medium 3 mainly containing high fusing point metal, and exhaust gas 4 mainly containing gas or mist-like low fusing point metal, and recovering the low fusing point metal by separating solid grains formed by cooling the exhaust gas 4 separated by the main separator 5, from the exhaust gas 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention effectively collects valuable metals at a high concentration at the same time when producing high-quality product gas using low-grade raw materials such as heavy oil, petro-coke, and waste containing a lot of metals. The present invention relates to a metal recovery method for a combustion facility.

  In recent years, low-grade fuels such as heavy oil and petro-coke have been used in combustion maintenance of fluidized bed boilers and the like from an economical viewpoint.

  However, heavy oil and petro coke contain a lot of metals such as vanadium V, nickel Ni, sodium Na, potassium K, etc. Therefore, the exhaust gas after combustion contains a lot of low melting point vanadium. As a result, fly ash adheres to the boiler tube or the like, hinders heat transfer, and has a problem of reducing the efficiency of heat recovery.

  On the other hand, a combustion facility for producing a high-quality product gas by gasifying using a low-grade raw material such as heavy oil or petro-coke has been proposed. The combustion equipment which partially oxidizes is disclosed.

In the combustion facility of Patent Document 1, unreacted substances discharged from the gasification furnace main body and precipitates from the gas phase are separated by a porous filter and led to a separate combustion / gasification furnace to produce heat or high calorie gas. It is shown that a water bath for recovering energy and passing the exhaust gas from the combustion / gasification furnace is provided below the combustion / gasification furnace to separate heavy metals contained in the unburned matter.
Japanese Patent Application Laid-Open No. 07-150148

  However, low-grade raw materials such as super heavy oil or heavy oil and petro coke shown in Patent Document 1 contain a lot of metals such as vanadium, nickel, sodium, potassium, etc. In Patent Document 1, combustion / gas It is said that heavy metals contained in the unburned matter will be recovered by passing the exhaust gas from the chemical furnace through the water bath, but the water bath only recovers compounds mainly composed of heavy metals and alkali metals. The valuable metals could not be effectively separated and recovered. In addition, it is very difficult to extract a specific metal from a compound recovered in a state where various metals are mixed. Therefore, it has not been conventionally effective to recover a specific valuable metal in a combustion facility. Is the current situation.

  The present invention has been made in view of the above-mentioned conventional problems, and when combusting or gasifying low-grade raw materials such as heavy oil containing a large amount of metal, petro-coke, waste, etc. in a combustion facility, An object of the present invention is to provide a metal recovery method for a combustion facility that recovers valuable metals effectively at a high concentration.

The metal recovery method for a combustion facility of the present invention is a metal recovery method for a combustion facility in which a raw material containing a large amount of metal is combusted in the combustion facility and metal is recovered from the combustion exhaust gas,
The combustion exhaust gas is supplied to a main separator and separated into a fluid medium mainly containing a high melting point metal and an exhaust gas mainly containing a gas and a mist-like low melting point metal,
The low-melting-point metal is recovered by separating the solid particles produced by cooling the exhaust gas separated by the main separator from the exhaust gas.

  In the above metal recovery method for combustion equipment, at least two types of low melting point metals can be recovered by separating each solid particle produced by cooling the exhaust gas at at least two different temperatures from the exhaust gas.

  In the metal recovery method for a combustion facility, at least two types of low melting point metals can be recovered by separating solid particles having different solid particle sizes in at least two stages from exhaust gas.

  In the metal recovery method for a combustion facility, a part of the fluid medium is taken out to the outside, and the refractory metal can be recovered by separating the fluid medium particles from the fluid medium taken out.

Further, in the metal recovery method for a combustion facility, the combustion facility is a fluidized bed combustion furnace, the combustion exhaust gas derived from the fluidized bed combustion furnace is separated into a fluidized medium and exhaust gas by a main separator, and the main separator The separated fluidized medium is supplied to the fluidized bed gasification furnace together with the metal-rich raw material, the raw material is gasified by the fluidized bed, and the generated gas is taken out. The fluidized medium of the fluidized bed gasification furnace is supplied to the fluidized bed combustion furnace and circulated. Like
A part of the fluid medium of the fluidized bed combustion furnace is taken out to the outside, and the refractory metal can be recovered by separating the fluid medium particles from the taken fluid medium.

  Moreover, in the metal recovery apparatus of the combustion facility, it is preferable to separate the tar containing metal from the product gas taken out from the fluidized bed gasification furnace, and to supply the separated tar to the fluidized bed combustion furnace.

  Further, in the metal recovery method for the combustion facility, the raw material rich in metal may be heavy oil.

  In the metal recovery method for the combustion facility, the raw material containing a large amount of metal may be petro coke.

  In the metal recovery method for the combustion facility, the low melting point metal may be vanadium.

  In the metal recovery method for the combustion facility, the refractory metal may be nickel.

  In the metal recovery method of the combustion facility, the melting point of the metal can be lowered by supplying chloride together with the raw material.

The metal recovery device for a combustion facility of the present invention is a metal recovery device for a combustion facility that burns a raw material containing a lot of metal in the combustion facility and recovers the metal from the combustion exhaust gas,
A main separator that separates combustion exhaust gas from the combustion facility into a fluid medium mainly containing a high-melting point metal and an exhaust gas mainly containing a gas and a mist-like low-melting point metal;
A cooler for cooling the exhaust gas separated by the main separator;
And a particle collector for separating solid particles generated by cooling of the cooler from the exhaust gas.

  In the metal recovery apparatus for a combustion facility, the combustion facility may be a fluidized bed combustion furnace.

  Moreover, the metal recovery apparatus for the combustion facility includes a cooler that cools the exhaust gas at at least two different temperatures, and a particle collector that separates solid particles generated by cooling by each cooler from the exhaust gas. Also good.

  Further, the metal recovery apparatus of the combustion facility may have a separator that separates solid particles having different solid particle sizes in at least two stages from exhaust gas.

  Further, the metal recovery apparatus of the combustion facility may have a high melting point metal recovery means for taking out a part of the fluid medium to the outside and separating the fluid medium particles from the fluid medium taken out.

  Further, in the metal recovery apparatus for a combustion facility described above, the combustion facility is a fluidized bed combustion furnace, a main separator that separates combustion exhaust gas derived from the fluidized bed combustion furnace into a fluidized medium and exhaust gas, and a main separator. The separated fluidized medium is supplied together with the metal-rich raw material, the raw material is gasified by the fluidized bed, and the generated gas is taken out, and the fluidized medium is supplied to the fluidized bed combustion furnace and circulated. It may be.

  Further, the metal recovery apparatus of the combustion facility may have a refractory metal recovery means for taking out a part of the fluidized medium of the fluidized bed combustion furnace to the outside and separating the fluidized medium particles from the removed fluidized medium.

  Moreover, the metal recovery apparatus for the combustion facility may have a tar separator for separating the tar containing metal from the product gas taken out from the fluidized bed gasification furnace and supplying the separated tar to the fluidized bed combustion furnace. .

  According to the metal recovery method for combustion equipment of the present invention, the low melting point metal is recovered by separating the solid particles produced by cooling the exhaust gas separated by the main separator from the exhaust gas. An excellent effect that the metal can be effectively recovered at a high concentration can be obtained.

  Further, by separating the solid particles produced by cooling the exhaust gas at at least two different temperatures from the exhaust gas, it is possible to effectively recover at least two kinds of low melting point metals.

  Also, by separating solid particles having at least two different solid particle sizes according to the solid particle size of the low melting point metal from the exhaust gas separated by the main separator, there is an effect that at least two types of low melting point metals can be recovered. .

  In addition, since a part of the fluid medium is taken out and the fluid medium particles are separated from the taken fluid medium, there is an effect that the high melting point metal can be effectively recovered at a high concentration.

  Moreover, since the tar containing the metal is separated from the product gas taken out from the fluidized bed gasification furnace, and the separated tar is supplied to the fluidized bed combustion furnace, the metal in the tar can be recovered from the exhaust gas. , Tar treatment is possible.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows an example of a fluidized bed gasification furnace that is a combustion facility for carrying out the present invention. The fluidized bed gasification furnace includes a fluidized bed combustion furnace 1 that burns char and heats a fluidized medium (sand, etc.). The main separator 5 that separates the flue gas 2 derived from the fluidized bed combustion furnace 1 into the fluid medium 3 and the exhaust gas 4, the fluid medium 3 separated by the main separator 5 is introduced and the raw material 6 is supplied, It has a fluidized bed gasification furnace 9 that is supplied with a gasifying agent 7 such as water vapor, air, carbon dioxide, etc. to form a fluidized bed 8. The raw material 6 supplied to the fluidized bed gasification furnace 9 is fluidized and agitated by the fluidized bed 8 of the gasifying agent 7 together with the high temperature fluidized medium 3 to be gasified, and the product gas 10 is taken out to the outside. On the other hand, the char generated when the raw material is gasified in the fluidized bed gasification furnace 9 is supplied to the lower part of the fluidized bed combustion furnace 1 together with the fluidized medium 3 and circulates, and the char burns in the fluidized bed combustion furnace 1. To heat the fluidized medium 3.

  The fluidized bed gasifier 9 is supplied with a low-grade raw material 6 such as heavy oil or petro-coke, and the heavy oil or petro-coke has metals such as vanadium, nickel, sodium and potassium. Many are included.

  In order to produce the high-quality product gas 10 by gasifying the raw material 6 such as heavy oil or petro coke in the fluidized bed gasification furnace 9, the gasification temperature of the fluidized bed gasification furnace 9 is usually 800 to In order to maintain the gasification temperature in the fluidized bed gasification furnace 9 at 800 to 900 ° C., the temperature of the fluidized bed combustion furnace 1 is maintained at 900 to 1000 ° C. 3 is performed.

  The combustion exhaust gas 2 at 900 to 1000 ° C. discharged from the fluidized bed combustion furnace 1 is guided to a main separator 5 composed of a cyclone 5a so as to separate the fluidized medium 3, and the cyclone 5a has a particle diameter of 10 μm or more. The solid particles are separated.

  The exhaust gas 4 from which the fluid medium 3 has been separated by the main separator 5 is cooled to 800 ° C. by the first cooler 11, and then a first particle collector such as a filter that collects submicron particles. 12, and further cooled to 600 ° C. by the second cooler 13, and then led to the second particle collector 14 by a bag filter or an electrostatic precipitator that collects submicron. . The first and second coolers 11 and 13 can be steam generators.

  On the other hand, the product gas 10 produced in the fluidized bed gasifier 9 is separated from particles 16 such as a fluid medium by a separator 15 using a cyclone, and then a tar 18 by a tar separator 17 such as a scrubber or an electric dust collector. The product gas 10 from which the tar 18 has been separated is used as fuel as it is, or purified by a gas purification device and used for the production of chemical raw materials and the like.

  Particles 16 such as a fluidized medium separated by the separator 15 are returned to the fluidized bed gasification furnace 9, and a tar 18 separated by the tar separator 17 contains a metal, and this metal is contained. The tar 18 is concentrated by a tar concentrator 19 such as a decanter or an evaporator, and the tar 18 containing the concentrated metal is supplied to the fluidized bed combustion furnace 1 and combusted.

  Further, a high melting point metal such as nickel oxide NiO is gradually concentrated in the fluidized medium 3 separated by the main separator 5 and circulated between the fluidized bed gasification furnace 9 and the fluidized bed combustion furnace 1. Therefore, a part of the fluidized medium 3 is taken out from the lower part of the fluidized bed combustion furnace 1, for example, and refractory metal recovery means 21 for separating the refractory metal 20 from the removed fluidized medium 3 is provided. The fluid medium 3 may be taken out at a position where the fluid medium 3 is supplied from the main separator 5 to the fluidized bed gasification furnace 9. As the refractory metal recovery means 21, a particle diameter difference separation method in which separation is performed using the particle diameter difference between the particles of the fluid medium 3 and the particles of the refractory metal 20, or the particles of the fluid medium 3 and the refractory metal. A specific gravity difference separation method that separates using a specific gravity difference with 20 particles can be used.

  A method for recovering metal from the fluidized bed gasifier will be described below.

  When the raw material 6 made of heavy oil or petro coke is supplied to the fluidized bed gasification furnace 9 maintained at a gasification temperature of 800 to 900 ° C., the raw material 6 is heated by the fluidized medium 3 and fluidized by the gasifying agent 7. Gasified and the product gas 10 is taken out from the fluidized bed gasification furnace 9. The product gas 10 is guided to a cyclone separator 15 to separate particles 16 such as a fluid medium, and then guided to a tar separator 17 to separate a tar 18 to be used as high-grade fuel or gas purification. It is supplied to the apparatus and purified.

At this time, the product gas derived from the fluidized bed gasification furnace 9 includes a low melting point metal vaporized at 800 to 900 ° C. or a mist, scattered metal, and metal contained in tar. . When chloride 27 (ammonium chloride NH ₄ Cl, hydrogen chloride HCl, etc.) is supplied together with the raw material 6, NiO having a melting point of 1984 ° C. or nickel Ni having a melting point of 1455 ° C. changes to NiCl ₂ (sublimation temperature 973 ° C.). It can also be included in the product gas 10 by vaporization.

  These metal species accompanying the product gas 10 are separated together with the tar 18 by the tar separator 17 and subsequently concentrated by the tar concentrator 19, and then supplied to the fluidized bed combustion furnace 1 to burn the tar. The melting point metal is vaporized or misted.

  By removing the tar 18 with the tar separator 17 as described above, it becomes possible to take out the high-quality product gas 10 from which the tar 18 and the metal species have been removed, and the separated tar 18 has a fluidized bed. The tar can be treated by supplying it to the combustion furnace 1 and burning it.

  On the other hand, among the metal species that have not been gasified in the fluidized bed gasification furnace 9, they are supplied to the fluidized bed combustion furnace 1 and circulated together with the fluidized medium 3 and the char.

Here, the present inventors measured the particle size distribution of the metal contained in the combustion furnace exhaust gas, and high melting point metals such as nickel Ni are present in a large amount of coarse particles of 10 μm or more, and the low melting point metal is 0.1 to It has been found that it exists in fine particles of 1 μm. From the results, for example, when 50 to 500 μm is used for the fluid medium (sand), the fluid medium (sand), nickel Ni as a high melting point metal species, sodium carbonate Na ₂ CO ₃ and potassium carbonate K _{2 as} low melting point metals. CO ₃ and vanadium pentoxide V ₂ O ₅ have a difference in particle diameter effective for separation and recovery.

  Since the combustion exhaust gas 2 of 900 to 1000 ° C. derived from the fluidized bed combustion furnace 1 is led to the main separator 5 composed of the cyclone 5a for separating solid particles having a particle diameter of 10 μm or more, the cyclone 5a The fluidized medium 3 having a particle diameter of 50 to 500 μm and the nickel oxide NiO, which is a refractory metal having a solid particle diameter of 10 μm or more, are separated and supplied to the fluidized bed gasifier 9. Accordingly, nickel oxide NiO, which is a refractory metal, circulates between the fluidized bed combustion furnace 1 and the fluidized bed gasification furnace 9 together with the fluidized medium 3, whereby the concentration of the refractory metal relative to the fluidized medium 3 gradually increases. It becomes concentrated.

The exhaust gas 4 from which the solid particles of 10 μm or more are separated by the main separator 5 is cooled to 800 ° C. by the first cooler 11 and guided to the first particle collector 12, so that submicron particles are supplemented. Be collected. Here, since the exhaust gas 4 is cooled to 800 ° C. by the first cooler 11, a low melting point such as sodium carbonate Na ₂ CO ₃ having a melting point of 851 ° C. and potassium carbonate K ₂ CO _{3 having} a melting point of 891 ° C. The metal 22 is deposited, and the low melting point metal 22 is collected by the first particle collector 12 and effectively recovered.

The exhaust gas 4 is subsequently cooled to 600 ° C. by the second cooler 13 and guided to the second particle collector 14 to collect submicron particles. Here, since the exhaust gas 4 is cooled to 600 ° C. by the second cooler 13, a low melting point metal 23 such as vanadium pentoxide V ₂ O ₅ having a melting point of 690 ° C. is deposited. Is collected by the second particle collector 14 and effectively recovered.

In this way, the low melting point metal 23 which is a valuable metal such as vanadium pentoxide V ₂ O ₅ is effectively recovered at a high concentration.

When chloride 27 (ammonium chloride NH ₄ Cl, hydrogen chloride HCl, etc.) is supplied together with the raw material 6, NiO having a melting point of 1984 ° C. or nickel Ni having a melting point of 1455 ° C. changes to NiCl ₂ (sublimation temperature 973 ° C.). It can also be included in the product gas 10 by vaporization. Therefore, nickel can be taken out in the form of NiCl by setting the cooling temperature of the exhaust gas 4 to a predetermined temperature.

  Further, since the high melting point metal such as nickel oxide NiO contained in the fluidized medium 3 separated by the main separator 5 and circulated between the fluidized bed gasification furnace 9 and the fluidized bed combustion furnace 1 is concentrated. A part of the fluid medium is taken out and supplied to the refractory metal recovery means 21. In the refractory metal recovery means 21, the fluidized medium 3 is separated by a particle diameter difference separation method or a specific gravity difference separation method, whereby the refractory metal 20 such as nickel oxide NiO is effectively recovered at a high concentration.

  FIG. 2 shows another example of a fluidized bed gasification furnace for carrying out the present invention. Since the basic configuration is the same as that of FIG. 1, only the parts different from those of FIG. 1 will be described.

  In FIG. 2, a cyclone 5 b that separates solid particles having a particle diameter of 50 μm or more is used in a main separator 5 that guides combustion exhaust gas 2 of, for example, 900 to 1000 ° C. from the fluidized bed combustion furnace 1. Yes. Further, the exhaust gas 4 separated by the main separator 5 is guided to a separator 24 made of a cyclone so as to separate solid particles having a particle diameter of 10 μm or more. Further, after the exhaust gas 4 that has passed through the separator 24 is cooled to a predetermined temperature by a cooler 25 such as a steam generator, a separator 26 such as a bag filter or an electric dust collector that collects submicron particles. To guide you to.

  In the form of FIG. 2, the flue gas 2 from the fluidized bed combustion furnace 1 is separated from the fluidized medium 3 having a particle diameter of 50 μm or more by the main separator 5 composed of the cyclone 5 b and nickel oxide NiO having a particle diameter of 50 μm or more. The melting point metal is separated.

  The exhaust gas 4 from which the solid particles of 50 μm or more have been separated by the main separator 5 has a solid particle diameter of 10 μm or more as described above because the solid particles of 10 μm or more are separated by the cyclone separator 24. The refractory metal 20 such as nickel oxide NiO is effectively collected by the separator 24.

Further, the exhaust gas 4 that has passed through the separator 24 is cooled by the cooler 25 below the melting point of the low melting point metal, so that the low melting point metal in the exhaust gas 4 is precipitated and separated into submicron particles by the separator 26. Is done. Therefore, the exhaust gas 4 is cooled by the cooler 25 to the melting point of the target low melting point metal or less and the particles are collected by the separator 26, so that the low melting point that is a valuable metal such as the target vanadium V ₂ O ₅ is collected. The metal 23 can be effectively recovered at a high concentration.

  Further, when the fluidized medium 3 separated by the main separator 5 by the cyclone 5b and the refractory metal such as nickel oxide NiO having a particle diameter of 50 μm or more circulate between the fluidized bed gasification furnace 9 and the fluidized bed combustion furnace 1. Therefore, by extracting a part of the fluid medium 3 to the outside and supplying it to the refractory metal recovery means 21, and separating the fluid medium 3 by the refractory metal recovery means 21, valuable metals such as nickel oxide NiO are obtained. The high melting point metal 20 can be effectively recovered at a high concentration.

As shown in FIG. 2, a method for separating a high melting point metal such as nickel oxide NiO and a low melting point metal such as vanadium pentoxide V ₂ O ₅ from the exhaust gas 4 from the main separator 5 according to the particle diameter is as follows. It can be applied to existing combustion equipment with relative ease.

In the above embodiment, the case is a heavy oil or Petro coke has been described when used as a raw material, can also be applied raw material rich in these other metals, for recovering vanadium pentoxide V ₂ O ₅ and nickel oxide NiO Of course, other metals can be recovered in the same manner, and various modifications can be made without departing from the scope of the present invention.

It is the schematic which shows an example of the fluidized bed gasification furnace which implements this invention. It is the schematic which shows the other example of the fluidized bed gasification furnace which implements this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluidized bed combustion furnace 2 Combustion exhaust gas 3 Fluidized medium 4 Exhaust gas 5 Main separator 6 Raw material 7 Gasifying agent 8 Fluidized bed 9 Fluidized bed gasifier 10 Product gas 11 1st cooler 12 1st particle collector 13 Second cooler 14 Second particle collector 17 Tar separator 18 Tar 20 High melting point metal 21 High melting point metal recovery means 22 Low melting point metal 23 Low melting point metal 24 Separator 26 Separator 27 Chloride

Claims (19)

A metal recovery method for a combustion facility that burns a metal-rich raw material in a combustion facility and recovers metal from the combustion exhaust gas,
The combustion exhaust gas is supplied to a main separator and separated into a fluid medium mainly containing a high melting point metal and an exhaust gas mainly containing a gas and a mist-like low melting point metal,
A method for recovering a metal from a combustion facility, comprising recovering low melting point metal by separating solid particles produced by cooling the exhaust gas separated by the main separator from the exhaust gas.   The metal recovery method for a combustion facility according to claim 1, wherein at least two kinds of low melting point metals are recovered by separating each solid particle generated by cooling the exhaust gas at at least two different temperatures from the exhaust gas.   The method for recovering metal from a combustion facility according to claim 1 or 2, wherein at least two kinds of low melting point metals are recovered by separating solid particles having different solid particle sizes in at least two stages from exhaust gas.   The metal recovery method for a combustion facility according to any one of claims 1 to 3, wherein a part of the fluid medium is taken out and the refractory metal is recovered by separating the fluid medium particles from the fluid medium taken out. The combustion facility is a fluidized bed combustion furnace, and the combustion exhaust gas derived from the fluidized bed combustion furnace is separated into a fluid medium and exhaust gas by a main separator, and the fluid medium separated by the main separator is combined with a raw material containing a large amount of metal. Supply to the fluidized bed gasification furnace, gasify the raw material in the fluidized bed and take out the generated gas, the fluidized medium of the fluidized bed gasification furnace is supplied to the fluidized bed combustion furnace to circulate,
The metal of the combustion facility according to any one of claims 1 to 3, wherein a part of the fluid medium of the fluidized bed combustion furnace is taken out and the refractory metal is recovered by separating the fluid medium particles from the taken fluid medium. Collection method.   The method for recovering metal from a combustion facility according to claim 5, wherein tar containing metal is separated from the product gas taken out from the fluidized bed gasification furnace, and the separated tar is supplied to the fluidized bed combustion furnace.   The method for recovering metal from a combustion facility according to any one of claims 1 to 6, wherein the metal-rich raw material is heavy oil.   The method for recovering metal from a combustion facility according to any one of claims 1 to 6, wherein the metal-rich raw material is petro coke.   The metal recovery method for a combustion facility according to any one of claims 1 to 8, wherein the low melting point metal is vanadium.   The method for recovering metal from a combustion facility according to any one of claims 1 to 8, wherein the refractory metal is nickel.   The method for recovering metal from a combustion facility according to any one of claims 1 to 10, wherein the melting point of the metal is lowered by supplying chloride together with the raw material. A metal recovery device for a combustion facility that burns a metal-rich raw material in a combustion facility and recovers metal from the combustion exhaust gas,
A main separator that separates combustion exhaust gas from the combustion facility into a fluid medium mainly containing a high-melting point metal and an exhaust gas mainly containing a gas and a mist-like low-melting point metal;
A cooler for cooling the exhaust gas separated by the main separator;
A metal recovery apparatus for a combustion facility, comprising: a particle collector for separating solid particles generated by cooling of a cooler from exhaust gas.   The metal recovery apparatus according to claim 12, wherein the combustion facility is a fluidized bed combustion furnace.   14. The metal recovery apparatus for a combustion facility according to claim 12, further comprising: a cooler that cools the exhaust gas at at least two stages of different temperatures; and a particle collector that separates solid particles generated by cooling by each cooler from the exhaust gas. .   The metal recovery device for a combustion facility according to any one of claims 12 to 14, further comprising a separator for separating solid particles having different solid particle sizes in at least two stages from exhaust gas.   The metal recovery apparatus for a combustion facility according to any one of claims 12 to 15, further comprising a refractory metal recovery unit that extracts part of the fluid medium to the outside and separates the fluid medium particles from the fluid medium that has been removed.   Combustion equipment is a fluidized bed combustion furnace, a main separator that separates combustion exhaust gas derived from the fluidized bed combustion furnace into a fluidized medium and exhaust gas, and a fluidized medium separated by the main separator together with a metal-rich raw material 13. The metal recovery apparatus for a combustion facility according to claim 12, further comprising a fluidized bed gasification furnace that is supplied and gasified by a fluidized bed to take out a generated gas, and supplies and circulates a fluidized medium to the fluidized bed combustion furnace. .   18. The metal recovery apparatus for a combustion facility according to claim 17, further comprising a refractory metal recovery means for extracting a part of the fluid medium of the fluidized bed combustion furnace to the outside and separating the fluid medium particles from the extracted fluid medium.   The metal recovery apparatus for a combustion facility according to claim 17 or 18, further comprising a tar separator that separates tar containing metal from the product gas taken out from the fluidized bed gasification furnace and supplies the separated tar to the fluidized bed combustion furnace.

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