WO2002035151A1 - Dispositif d'incineration ou de gazeification utilisant un alliage resistant a la corrosion a haute temperature - Google Patents

Dispositif d'incineration ou de gazeification utilisant un alliage resistant a la corrosion a haute temperature Download PDF

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Publication number
WO2002035151A1
WO2002035151A1 PCT/JP2001/009339 JP0109339W WO0235151A1 WO 2002035151 A1 WO2002035151 A1 WO 2002035151A1 JP 0109339 W JP0109339 W JP 0109339W WO 0235151 A1 WO0235151 A1 WO 0235151A1
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WIPO (PCT)
Prior art keywords
temperature
corrosion
furnace
alloy
gas
Prior art date
Application number
PCT/JP2001/009339
Other languages
English (en)
Japanese (ja)
Inventor
Manabu Noguchi
Kei Matsuoka
Akira Uchino
Hiroshi Yakuwa
Hideyuki Sakamoto
Original Assignee
Ebara Corporation
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 Ebara Corporation filed Critical Ebara Corporation
Priority to AU2002210937A priority Critical patent/AU2002210937A1/en
Priority to JP2002538101A priority patent/JPWO2002035151A1/ja
Publication of WO2002035151A1 publication Critical patent/WO2002035151A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/053—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 30% but less than 40%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
    • 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
    • F23G5/44—Details; Accessories
    • F23G5/48—Preventing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • the present invention relates to an apparatus for incinerating or gasifying solid fuel such as waste or coal, and in a member or an apparatus constituting the incineration or gasification apparatus, which is so strong that chloride corrosion and sulfide corrosion occur simultaneously with the increase in temperature.
  • the present invention relates to an incineration or gasification apparatus characterized in that a portion to be corroded is made of an alloy having excellent high-temperature corrosion resistance.
  • the high-temperature gas generated by incineration or gasification contains chlorine or sulfur originating from chlorine or sulfur contained in waste or fuel. Includes corrosive gases such as hydrogen, sulfur oxides, and hydrogen sulfide.
  • FIG. 1 shows the temperature dependence of the corrosion rate of metallic materials in a high-temperature corrosive gas environment. Corrosion below 150 ° C is electrochemical corrosion even if it occurs below the acid dew point. Corrosion is relatively low in the 150-320 ° C region above the acid dew point. Above 320 ° C, corrosion becomes increasingly severe with increasing temperature. In particular, as in the inside or the like of Poira waste incinerators, if Dust content is entrained in the hot corrosive gases, salts in Dust is melted at 3 0 0 ⁇ 7 0 0 D C As shown by the solid line A in Fig.
  • the combustion temperature in the gasification and melting furnace is about 1200 to 1500 ° C, which is much higher than that of the conventional incinerator of 800 to 900 ° C. For this reason, there are not only many devices or equipment that are used at higher temperatures than before, and from the viewpoint of effective energy utilization, exhaust gas with a high temperature of 1200 to 150 There is a need for a system that provides effective heat recovery. From such requirements, it is expected that a metal material exhibiting excellent high-temperature strength and high-temperature corrosion resistance at a higher temperature than before, preferably up to about 1200 ° C., will be put to practical use. Disclosure of the invention
  • the present invention has been made in view of the above-described problems, and has been developed without the need for excessive cooling or surface protection in a high-temperature complex corrosive environment in which chloride and sulfuration occur simultaneously in addition to high-temperature oxidation.
  • high-temperature corrosion resistance is required in incinerators or gasifiers for solid fuels such as waste or coal, using alloys that have sufficient high-temperature strength as high-temperature members and have excellent high-temperature corrosion resistance. It is an object of the present invention to provide a device for incinerating or gasifying solid fuel such as waste or coal, in which the parts are constituted by using the alloy, thereby improving the durability and function of the device as compared with the conventional device.
  • T alloy commercially available Ni-33Cr-15W alloy
  • Sample parts were prepared in accordance with, and corrosion experiments were performed at temperatures of 900 ° C, 1000 ° C, and 1100 ° C, respectively, using an incinerator (incinerator) or gasifier (gas furnace). As a result, the amount of corrosion tended to decrease as the temperature increased.
  • Figure 2 shows the tendency of the variation in the amount of corrosion of the prototype alloy with the addition of A1 or Si.
  • the corrosion amount of the alloy containing Si added to the T alloy is large near 900 ° C, and tends to decrease as the temperature rises.
  • the severe corrosion observed at around 900 ° C can be reduced by adding A1, and it is clear that the corrosion resistance can be further improved by adding A1 and Si simultaneously. It became.
  • A1 is added to the alloy to suppress severe corrosion at 800 to 900 ° C, Si for further improvement of corrosion resistance, and high temperature strength improvement.
  • W tungsten
  • the present invention has been completed based on the above-described experiments.
  • the present invention has solved the above problems by the following means.
  • the above alloys have excellent mechanical strength and are difficult to machine. For this reason, when manufacturing a mechanical member using this alloy, the manufacturing cost can be reduced by using the manufacturing method.
  • the manufacturing cost can be reduced by manufacturing using a centrifugal manufacturing method.
  • a composition having excellent corrosion resistance can be formed on the outer surface side, so that the method is suitable for equipment members that require corrosion resistance on the outer surface side.
  • Figure 1 shows the temperature of the corrosion rate of general metallic materials in a corrosive gas environment.
  • FIG. 4 shows a diagram illustrating the dependence.
  • Figure 2 shows a graph showing the tendency of the variation in the corrosion amount of the prototype alloy in which A1 or Si was added to the T alloy.
  • Figure 3 shows a schematic explanatory diagram of the overall flow of the fluidized bed gasification and melting furnace.
  • FIG. 4 is a schematic explanatory diagram of an embodiment of the present invention for a waste supply apparatus.
  • FIG. 5 is a schematic explanatory view of an embodiment of the present invention for a furnace starter or a combustion supporter.
  • FIG. 6 is a schematic explanatory diagram of an embodiment of the present invention for a nozzle for introducing air, oxygen, steam, etc. into the furnace.
  • FIG. 7 is a schematic explanatory view of another embodiment of the present invention for a nozzle for introducing air, oxygen, steam, etc. into the furnace.
  • FIG. 8 is a schematic explanatory view of an embodiment in which a member 23 of the present invention is provided for a nozzle for introducing air, oxygen, steam and the like into a furnace.
  • FIG. 9 is a schematic explanatory view of an embodiment in which a replaceable member 24 of the present invention is provided for a nozzle for introducing air, oxygen, steam and the like into the furnace.
  • FIG. 10 is a schematic explanatory view of an embodiment of the present invention for a thermocouple protection tube.
  • FIG. 11 is a schematic explanatory diagram of an embodiment of the present invention for a probe of a sampling peir.
  • FIG. 12 is a schematic explanatory view of another embodiment of the present invention for a probe of a sampling device.
  • FIG. 13 shows a schematic explanatory view of an embodiment of the present invention for a slag discharge section.
  • C shows a schematic explanatory view of a slag cooling and granulating apparatus by a water granulation method.
  • FIG. 15 is a schematic explanatory view of an embodiment of the present invention for a slag cooling device using an indirect cooling system.
  • FIG. 16 is an explanatory view of a bayonet heat exchanger to which the present invention is applied.
  • FIG. 17 is a schematic explanatory view of an embodiment of the present invention for a waste gasification / melting apparatus using a high-temperature heat exchange apparatus.
  • FIG. 18 is a schematic explanatory view of another embodiment of the present invention for a waste gasification and melting apparatus using a high-temperature heat exchange apparatus.
  • FIG. 19 is a schematic explanatory diagram of another embodiment of the present invention for a waste gasification and melting apparatus using a high-temperature heat exchange apparatus.
  • FIG. 20 is a schematic illustration of an embodiment of the present invention for a boiler heat transfer tube protector.
  • FIG. 21 is a schematic explanatory view of an embodiment of the present invention for a kiln type gasifier.
  • FIG. 22 is a schematic explanatory view of an embodiment of the present invention for a carbonizing apparatus.
  • FIG. 23 is a schematic illustration of an embodiment of the present invention for a grate of a stoichiometric incinerator.
  • FIG. 24 is a schematic explanatory diagram of an embodiment of a waste gasification and melting system which can be newly realized by the present invention.
  • FIG. 25 is a schematic explanatory view of another embodiment of a waste gasification and melting system which can be newly realized by the present invention.
  • FIG. 26 is a schematic explanatory view showing the application of the present invention when a part of the high-temperature exhaust gas is passed to the slag discharge section in the waste gasification and melting furnace in order to prevent cooling of the slag discharge section.
  • the metal material composition is 23 to 40% by mass, preferably 25 to 40%, preferably 25 to 40%, and A 1 is 1.5 to 7%, C is 0.1 to 0.5%, W and Mo total amount is 15% or less, Mn is 1.0 ° / 0 or less, Si is 0.3 to 6%
  • Fe and Fe are contained in an amount of 5% or less, and the balance is made of a Ni alloy excluding unavoidable impurities, it is possible to provide sufficient corrosion resistance and high-temperature strength.
  • examples of more preferable metals are specified.
  • FIG 3 shows the overall flow of the waste gasification and melting furnace, which consists of a fluidized bed gasifier and a rotary melting furnace.
  • Waste a is first introduced into the fluidized-bed gasifier 101 by the feeder 108, and the amount of oxygen in the oxygen-deficient state that is lower than the theoretical amount of oxygen required for combustion of the waste is reduced to 500-6. It is heated to 00 ° C and gasified. According to the fluidized bed gasifier 101, the fluidized bed temperature is low. In addition, since it is a reducing atmosphere, metals such as iron, copper, and aluminum in incombustibles can be recovered in an unoxidized state. .
  • the pyrolysis gas b generated in the fluidized-bed gasification furnace 101 including char, tar, etc., is sent to the swirling melting furnace 102, and is heated to 1200 to 1500 ° C without auxiliary fuel. Burns at high temperatures.
  • gas combustion is mainly performed, so that combustion at a low air ratio of about 1.3 is possible, thereby reducing the amount of exhaust gas from the swirling melting furnace 102.
  • dioxins can be completely decomposed.
  • the slag can be efficiently separated by the centrifugal force effect by using the swirling flow, and by cooling this, the heavy metal can be contained in the solid slag c on the glass.
  • Exhaust gas d from the rotary melting furnace 102 has a temperature of 1200 to 1500 ° C. After being discharged from the rotary melting furnace 102, the high-temperature heat exchanger 103 The temperature is reduced via waste heat boiler 104, economizer 105, air preheater 106, etc. The exhaust gas d is finally discharged to the atmosphere from the chimney after dust is removed by the bag filter 107.
  • the durability or function of the device can be improved as compared with the conventional device.
  • the durability or function can be improved by using the alloy.
  • a promising portion is marked with a circle, and a detailed example of each portion will be described below.
  • the first embodiment of the present invention is an example in which the above-mentioned high-temperature corrosion-resistant alloy is applied to the supply device 108 to the fluidized-bed gasifier 101 shown in FIG. 3, and the details thereof are shown in FIG. It is shown.
  • the type of the furnace is a fluidized bed gasifier, but the type of the furnace is not necessarily limited to this.
  • a fluidized bed incinerator, a kiln type gasifier Other types of furnaces may be used.
  • the casing 1, screw shaft 2, and screw blades 3 of the screw conveyor type feeder 108 attached to the fluidized bed gasifier 101 are in direct contact with the inside of the furnace where the temperature is high. And is exposed to high-temperature corrosive gas g of about 500 to 900 ° C generated by gasification of waste,
  • the casing 1, the screw shaft 2, and the screw blades 3 are generally made of stainless steel or the like, and generally cooled with cooling water to prevent deterioration of the material due to high temperature.
  • the cooling water h passes through the inside of the rotating screw shaft, which complicates the structure of the connection between the screw shaft and the cooling water pipe, and the amount of cooling water h becomes enormous depending on the scale of the equipment.
  • a casing 1 Since the above-mentioned high-temperature corrosion-resistant alloy exhibits extremely excellent corrosion resistance even to the above-mentioned high-temperature corrosive gas at 500 to 900 ° C, a casing 1. Screw shaft 2, screw By configuring the blades 3 etc., the durability of the supply device can be improved compared to the conventional one, and the amount of cooling water h that was required in the past can be significantly reduced, or the cooling water h itself can be used. By eliminating the need, the configuration of the device can be greatly simplified.
  • the corrosion resistance to severe corrosion at 500 to 900 ° C, particularly 800 to 900 ° C, and Of these, it is desirable to use a material containing 2 to 4% of Si and 2% of A1 in terms of mass% to improve corrosion resistance. From the viewpoint of strength, according to the test results, there is no problem because the alloy having the above composition has a sufficient mechanical strength up to about 900 ° C.
  • the second embodiment of the present invention uses the above-mentioned high temperature resistant material as a material for the start-up / combustion burner 1 ° 9 of the fluidized bed gasifier 101 or the swirling melting furnace 102 in FIG.
  • This is an example using a corrosive alloy, and the details are shown in Fig. 5.
  • the type of the furnace in which the wrench is used is a fluidized bed gasifier.
  • it is a swirling melting furnace, but it is not necessarily limited to this.It is used in furnaces with a high-temperature corrosive gas environment, such as fluidized bed incinerators, kiln-type gasifiers, and shaft-type melting furnaces. If it is Pana, it does not matter.
  • fossil fuels such as light oil, heavy oil, propane gas, and natural gas are used as the fuel j of the PANA 109, and its combustion temperature depends on the air-fuel ratio (the ratio of air i to fuel j). Depending on the case, it usually reaches around 2000 ° C. For this reason, components such as the nozzle tip 11 and flame stabilizer 12 that are particularly hot are protected by cooling, but if the material is cooled excessively to increase the durability of the material, the combustion temperature will increase. that therefore undesirable c to affect the combustion state, the material of these members, on through the coolant h to cool the normal material temperature up to 1 0 0 0 ° about C, such temperature scent Therefore, a material having sufficient mechanical strength was used.
  • the high temperature corrosion resistant material according to c present invention PANA had to be devised so as not exposed to a high temperature corrosive gas g, were excellent in 1 0 0 0 ° about C
  • it also has a certain high-temperature strength, so it can be expected to greatly extend its life by using it as a material for nozzle tips 11 and flame stabilizers 12 of the wrench.
  • the simplification of the device can be expected by omitting the remover.
  • a nozzle portion 110 for blowing a gas such as air, oxygen, or steam into the furnace in the fluidized-bed gasification furnace 101 or the rotary melting furnace 102 shown in FIG. 3, a nozzle portion 110 for blowing a gas such as air, oxygen, or steam into the furnace.
  • a gas such as air, oxygen, or steam into the furnace.
  • a fluidized bed incinerator kiln type Any nozzle that blows gas such as air, oxygen, or steam into an environment having a high-temperature corrosive gas, such as a gasification furnace or a shaft-type melting furnace, may be used.
  • FIG. 6 and FIG. 7 show an embodiment for a case where there is no slag in which ash is melted in the furnace, as in the case of the fluidized bed gasifier 101.
  • Gas 1 such as air (lowercase letter L, the same applies hereinafter) is supplied into the furnace via nozzle 110.
  • the furnace wall is configured by attaching a refractory 22 to the inner surface of a steel shell or a water pipe wall 21.
  • the material of the nozzle 110 a general metal material of carbon steel or stainless steel has been used.
  • the temperature of the nozzle 110 is almost equal to the temperature of the gas 1 inside the furnace sufficiently in front of the furnace, but rises significantly at the tip 110a due to the furnace temperature.
  • the tip of the nozzle 110 is drawn from the inner surface of the refractory 22.
  • the tip 110a of the nozzle 110 is exposed to high temperatures, and the strength can be reduced, and corrosion due to contact with the high-temperature corrosive gas g in the furnace can be avoided to some extent.
  • the refractory 22 caused damages such as cracks and falling off due to thermal expansion at the corners 22a of the refractory 22.
  • FIG. 7 shows a case where the tip of the nozzle 110 is flush with the inner surface of the refractory 22.
  • the above-mentioned refractory Although the damage of 2 can be prevented, the tip 110 a of the nozzle 110 becomes hot and comes into contact with the hot corrosive gas g in the furnace. If the hot corrosion resistance is not sufficient, there is a problem that the nozzle 110 is easily damaged.
  • the above high-temperature corrosion-resistant alloy exhibits excellent mechanical strength and corrosion resistance even in a temperature range of 1000 to 1200 ° C.
  • all of the above problems can be solved. That is, damage to the refractory 22 can be prevented, and corrosion damage to the nozzle 110 itself can be reduced.
  • Fig. 8 and Fig. 9 show that, as in the case of the swirling melting furnace 102, when slag with ash melted in the furnace and flows down the furnace inner wall, gas such as air is blown into the furnace.
  • gas such as air
  • An example is shown in which the high-temperature corrosion-resistant alloy described above is used for the nozzle to be supplied to the nozzle.
  • the tip end 110 a of the air supply nozzle 110 is connected to the inner surface of the refractory 22 as shown in Fig. 7. If it is the same plane as above, slag m may solidify and grow at the tip 110a of the nozzle, and may block the nozzle.
  • Fig. 8 and Fig. 9 show a method to solve this problem.
  • the slag contact portion 23 that comes into direct contact with the slag flow may be formed as a unitary structure with the refractory 22 as shown in FIG. 8, but as shown in FIG.
  • the member 24 having the structure of 0a and the slag contact portion 23 as one body may be constituted by using the high-temperature corrosion-resistant alloy described above, and may be attached to the tip of the nozzle 110.
  • the specific alloy composition is preferably adjusted in accordance with the temperature of the nozzle 110 or the member 24.
  • the temperature is about 500 to 700 ° C.
  • the above alloy contains 0.3 to 1% of Si, 2% of A1, and 8% or less of W in mass%. By doing so, the amount of W added can be reduced and cost can be reduced.
  • the temperature is about 700 to 100 ° C, the corrosion resistance can be reduced by including 1 to 4% of Si, 2% of A1, and 8 to 15% of W. Can be improved. In addition, 1000 to 1200. If it is about C, high temperature strength and corrosion resistance can be improved by containing 0.3 to 1% of Si, 2 to 7% of A1, and 8 to 15% of W.
  • the fourth embodiment of the present invention is used for measuring the temperature in the fluidized bed gasifier 101, the swirling melting furnace 102, the waste heat boiler 104, etc. in FIG.
  • a thermocouple protective tube or a probe of a sampling device used for measuring gas properties in the device is constructed using the high-temperature corrosion-resistant alloy described above.
  • the details are shown in FIGS. 10 to 12.
  • Note c are shown, rather than those type of furnace is restricted to the fluidized bed gasification furnace or pivoting melting furnace, for example a fluidized bed incinerator, kiln gasifier, shafts preparative melting furnace or other
  • It may be a thermocouple / sampling device in a high-temperature corrosive gas environment such as a chemical synthesis / decomposition device.
  • thermocouple protection tubes and sampling device probes used in such environments are made of metals such as stainless steel up to about 700 ° C, and temperature environments of 700 ° C or more.
  • ceramic materials such as alumina were generally used.
  • ceramic materials are vulnerable to thermal shock, and as a result, the material may suddenly crack and break due to furnace temperature fluctuations.
  • FIG. 10 shows a case where the above-mentioned high-temperature corrosion-resistant alloy is used as a material of the thermocouple protection tube 31.
  • the high-temperature corrosion-resistant alloy described above can be expected to have high corrosion resistance, particularly in a temperature range of 700 to 100 ° C., as compared with conventional stainless steel and high-grade metal materials such as A11oy65, The replacement cost can be reduced by forming the thermocouple protection tube 31 using this.
  • it since it has sufficient high-temperature strength up to about 1200 ° C, it is possible to use metal materials even in the temperature range where ceramic materials had to be used in the past. It is also possible to avoid breakage of the thermocouple wire 32 due to sudden cracking and breakage when using a thermocouple.
  • Figs. 11 and 12 show the above-mentioned probe of a sampling device used to grasp the properties of high-temperature corrosive gas in an incinerator, gasifier, melting furnace, etc.
  • An example using a high temperature corrosion resistant alloy is shown.
  • the easiest way to ascertain the gas properties inside the furnace is to insert a pipe-shaped probe 33 into the furnace as shown in Fig. 11 and to transfer the hot corrosive gas g inside the furnace to the outside.
  • the suction method is good.
  • the probe 33 should be constructed as shown in Fig. 12.
  • Cooling is performed by a cooling fluid (for example, cooling water) h to increase the durability of the material.
  • a cooling fluid for example, cooling water
  • the hot corrosive gas g leaks into the cooling fluid h, or vice versa.
  • the alloy leaked into the furnace.
  • the durability of the probe 33 can be greatly improved, so there is no such concern.
  • the specific alloy composition is preferably adjusted according to the furnace temperature.
  • the furnace temperature is 5 0 0 to 7 0 0 ° about C, of the alloy, the mass 0/0 0 S i in. 3-1%, the A 1 2% W 8%
  • the corrosion resistance is improved by containing 1 to 4% of Si, 2% of A1 and 8 to 15% of W. be able to.
  • the temperature is about 1000 to 1200 ° C, it should contain 0.3 to 1% of Si, 2 to 7% of A1, and 8 to 15% of W.
  • high temperature strength and corrosion resistance can be improved.
  • the slag discharge section 111 in the lower part of the melting furnace 102 in FIG. 3 is constituted by using the above-mentioned high-temperature corrosion-resistant alloy, and FIG. It is shown.
  • the type of the furnace is not limited to the rotary melting furnace, but may be another type of melting furnace such as a shaft melting furnace, a plasma melting furnace and an electric resistance furnace.
  • the slag generated by melting the ash in the melting furnace is turned into a liquid and discharged out of the furnace from the slag discharge section at the bottom of the melting furnace.
  • the slag discharge section is constructed integrally with the inner wall of the furnace and made of irregular refractories.
  • refractories are locally eroded in the lower part of the slag. Therefore, it is necessary to periodically check the erosion conditions and repair the refractories if necessary.
  • Repair work on refractories requires a number of steps, such as removal of existing refractory materials, repair of refractory support brackets, and placement of refractory materials, and is a relatively long-term work. There was a problem that the operation had to be stopped.
  • the melting point of slag is generally about 1200 ° C, so at least It is desirable to use a material that has sufficient mechanical strength up to about 1200 ° C and corrosion resistance to high-temperature corrosive gas in the furnace.
  • the above-mentioned high-temperature corrosion-resistant alloy exhibits sufficient mechanical strength and excellent high-temperature corrosion resistance in a temperature range up to about 1200 ° C. The above problem can be solved by constructing the slag outflow section using this alloy.
  • a gutter-shaped member 41 is manufactured by using the high-temperature corrosion-resistant alloy described above, and a c- gutter-shaped member is shown, which is an example in which a slag discharge part is configured using the gutter-shaped member 41.
  • the member 41 is attached to the furnace wall 43 by a support fitting 42.
  • the slag m is discharged out of the furnace along a flow path formed on the upper surface of the gutter-shaped member 41.
  • the gutter-shaped member 41 is preferably manufactured by a structure, and the flow path can be formed inexpensively and easily. In addition, even if it becomes necessary to repair the slag discharge part due to corrosion or deterioration of the material, it is only necessary to remove the member 41 and replace it with a new one.
  • a cooling and granulating apparatus 112 for slag discharged from the slag discharge section 111 is constituted by using the high-temperature corrosion-resistant alloy according to the present invention. Details are shown in FIG. 14 and FIG.
  • the type of the furnace is not limited to the waste gasification and melting furnace, but may be another type of melting furnace such as a shaft melting furnace, a plasma melting furnace, and an electric resistance.
  • cooling water h is allowed to flow on an inclined metal plate 51, and this is directly fed from the furnace.
  • a crushing method is often used in which slag m is brought into contact with the slag m and rapidly cooled to granulate and discharge as granulated slag n outside the furnace.
  • the cooling rate of the slag m is so high that the structure of the slag becomes brittle and the strength is reduced, which is a major obstacle in reusing the slag as roadbed material and construction material.
  • the temperature of the upper surface of the metal plate 51 becomes higher than that of the method, and the upper side of the metal plate 51 is an atmosphere in which the hot corrosive gas g in the furnace exists. 5
  • the durability of 1 From the viewpoint of durability, when the metal plate 51 is made of stainless steel, the upper limit of the temperature of the metal plate 51 must be about 500 ° C. in practical use. It is preferable to reduce the cooling rate as much as possible, because the structure of the indirect cooling slag o is denser and the mechanical strength is improved.However, it is necessary to further increase the temperature of the metal plate 51. Materials having excellent corrosion resistance that can be used for a long period of time even in various environments have been demanded.
  • the cooling rate of the slag is proportional to the temperature difference between the slag m and the metal plate 51. For example, when the temperature of the slag m is 1300 ° C and the metal plate 51 is made of stainless steel with a heat-resistant temperature of 500 ° C, the temperature difference between the two is 800 ° C.
  • the temperature difference between the two is 400 ° C, and the cooling rate is half that of the conventional one. C That is, by configuring the metal plate 51 using the present alloy, the control range of the cooling rate of the slag m can be greatly expanded.
  • the operating temperature of the metal plate 51 it is preferable to estimate the operating temperature of the metal plate 51 according to the required cooling rate and adjust the components. For example, if the operating temperature is about 500 to 700 ° C., the mass of the above alloys. /. Containing 0.3% to 1% of Si, 2% of A1, and 8% or less of the total amount of W and Mo, thereby reducing the amount of W added and reducing cost. Can also be achieved c 700-: LOOO ° C, if S i:! Up to 4%, A1 at 2%. The total amount of W and Mo is from 8 to 15% to improve corrosion resistance. Can be up. Further, if the temperature is about 100 to 1200 ° C, the content of 3 is 0.3 to 1%, A1 is 2 to 7%, and W is 8 to 15%. High temperature strength and corrosion resistance to slag can be improved.
  • the seventh embodiment of the present invention is an example in which the above-mentioned high-temperature corrosion-resistant alloy is used for the high-temperature heat exchanger 103 installed in the high-temperature corrosive exhaust gas at the outlet of the melting furnace 102 in FIG. Details are shown in FIGS. 16 to 19.
  • the present embodiment is described with reference to a fluidized bed gasification / melting furnace, the type of the furnace is not necessarily limited to this. Kiln-type gasification / melting furnaces, shaft-type melting furnaces Other types of gasification and melting furnaces, such as a gasification and melting furnace, and a single-storage or fluidized-bed incinerator may be used.
  • the exhaust gas from the furnace outlet generally has a very high temperature of 1200 to 150 ° C, which is equivalent to the combustion temperature of the melting furnace. Therefore, by circulating the high thermal energy of this high-temperature exhaust gas to the upstream side of the process or collecting it for use in power generation, external auxiliary fuel can be reduced and power generation efficiency can be improved. A great many benefits can be expected in terms of energy balance.
  • the heat storage type heat exchanger is a method in which a heat storage body such as a ceramic is installed, and heat exchange is performed by alternately passing fluid on the heating side and the heated side through this heat storage body. A slight mixing of the fluid on the side is inevitable, and valves etc. in high temperature corrosive environment for switching exhaust gas flow path.
  • problems such as the need to install mechanical devices and complicated equipment.
  • Another example is a heat exchange device that has a structure in which a metal heat transfer tube is placed in the exhaust gas flow path and its surface (contact surface with corrosive gas) is covered with a refractory to protect the metal. Proposed.
  • a metal heat transfer tube is placed in the exhaust gas flow path and its surface (contact surface with corrosive gas) is covered with a refractory to protect the metal. Proposed.
  • the structure of the support bracket and the like becomes very complicated.
  • the thermal conductivity of refractories is generally much lower than that of metal materials, and the heat transfer efficiency of the heat exchanger is greatly reduced.Therefore, there is a problem that the heat transfer area must be very large. .
  • Fig. 16 shows the structure of a panet-type high-temperature heat exchanger as an example of a high-temperature heat exchange device composed of the high-temperature corrosion-resistant material.
  • the bayonet type heat exchanger has a large number of double-tube heat exchangers
  • Fig. 16 shows only one double-tube heat exchanger.
  • the heat exchange section having a double-pipe structure includes an outer cylinder 61 having a substantially cylindrical container shape with one end opened and the other end closed, and a cylindrical inner cylinder 62 having both ends opened.
  • the heated gas p such as low-temperature air flows in from one end of the inner cylinder 62, flows into the annular space between the outer cylinder 61 and the inner cylinder 62 from the opening at the other end, and ends at one end of the outer cylinder 61. Spills out of the openings.
  • the heated gas p such as air exchanges heat with the hot corrosive flue gas g and is heated.
  • the fluid p on the low-temperature side to be heated is a gas such as air, but is not limited to this.
  • a gas such as air
  • a heat exchanger that heats low-temperature flue gas with high-temperature flue gas may be used.
  • the high-temperature heat exchanger of the panet type shown in Fig. 16 has a cantilever structure and one end has a completely free structure, so there is no need to consider thermal expansion measures and it is simple.
  • the outer cylinder 61 is formed using the high-temperature corrosion-resistant alloy described above.
  • a method of manufacturing the outer cylinder it is desirable to weld the cap part made as a sand or metal part to the straight part made as a centrifugal pipe, but in some cases the whole part is integrated Alternatively, a straight pipe or a cap manufactured by construction may be used.
  • the fluid on the heated side! Is a non-corrosive gas such as air, oxygen, steam, nitrogen, or a mixture of these gases, it may be composed of general carbon steel or stainless steel.
  • the fluid p has a corrosive property, for example, when it is a combustion exhaust gas, it is desirable to use the above-mentioned high temperature corrosion resistant alloy.
  • the operating temperature is about 500 to 700 ° C, the mass of the above alloys. /. Containing 0.3% to 1% of Si, 2% of A1, and 8% or less of the total amount of W and Mo, thereby reducing the amount of W added and reducing cost.
  • c also be achieved, if 7 0 0 ⁇ 1 0 0 0 ° about C, and S i 1 ⁇ 4%, 2% and a i, and 8 contain 1 5% total of W and M o
  • the temperature is about 1 000 to 1200 ° C, high temperature strength can be obtained by containing 0.3 to 1% of Si, 2 to 7% of A1, and 8 to 15% of W. And the corrosion resistance can be improved.
  • the temperature range up to about 1200 ° C is appropriate for the use conditions of this alloy.
  • the temperature of the flue gas g is 1500 ° C
  • the outer cylinder 61 is cooled by the fluid p to be heated, if the temperature of the fluid p to be heated is lowered to some extent, It is easy to reduce the temperature of 61 to 1200 ° C or less, and there is no problem in the use conditions of this alloy.
  • the bayonet-type heat exchanger shown in Fig. 16 is merely an example, and even a more general shell-and-tube type heat exchanger etc. I don't care.
  • the portion that comes into contact with the high-temperature corrosive gas must be formed using the above-mentioned high-temperature corrosion-resistant alloy.
  • FIGS. 17 to 19 show an example in which the above-described high-temperature heat exchanger is used in a waste gasification and melting furnace composed of a gasification furnace and a melting furnace.
  • the high-temperature heat exchanger 103 according to the present invention is installed immediately after the melting furnace 102 at the latter stage of the gasification furnace 101, 1 20 and 0 ° C or more high-temperature corrosive gas g, by the 2 50 ° air r 1 of about C to heat exchange, noted c to obtain a hot air r 2 of 400 to 8 00 ° C, high-temperature heat It is not always necessary to install the exchanger 103 at the position immediately after the melting furnace 102, and it is necessary to provide a high-temperature heat exchanger near the outlet in the melting furnace as an integral structure with the melting furnace. 3 or a high-temperature heat exchanger 10 3 May be installed.
  • the embodiment shown in FIG. 17 shows a case where the high-temperature air r 2 obtained in the high-temperature heat exchanger 103 is used as combustion air in the melting furnace 102.
  • the use of such high-temperature air as the combustion air for the melting furnace instead of the usual low-temperature air at room temperature or about 250 ° C, enables the waste heat generation to be reduced. It is expected that the introduction of supplementary fuel is not required, or even if it is necessary, the amount can be greatly reduced.
  • the embodiment shown in FIG. 18 is a high-temperature air heater according to the present invention as a high-temperature air heater in a waste combustion power generation system proposed by the present inventors in Japanese Patent Application No. 10-169286.
  • This is an example in which an exchanger is applied.
  • the high-temperature air r 2 of about 700 ° C obtained by the high-temperature air heater 103 as a high-temperature heat exchanger is converted to superheated steam of about 400 ° C obtained by the subsequent boiler 104.
  • s1 is used to reheat in the steam superheater 113.
  • high-temperature superheated steam s2 of about 500 ° C is obtained, and it is possible to perform high-efficiency waste power generation with a power generation end efficiency of 30 to 32%.
  • the air r2 after the steam is overheated is cooled to about 400 to 500 ° C, but it is generally used at room temperature or about 250 ° C, which is generally used as the combustion air in a melting furnace. Since it has a sufficiently high temperature compared to air at a very low temperature, the effect of reducing auxiliary combustion can be expected as in the embodiment shown in Fig. 17 by using this air for combustion in the melting furnace.
  • a high-temperature source is used as a heat source for maintaining the inside of the kiln-type gasifier at an appropriate gasification temperature.
  • the case where the high-temperature air obtained by the air heater 103 is used is shown.
  • the gasification temperature in the gasification furnace is generally from 400 to 100 ° C., preferably The temperature is preferably 500 to 600 ° C, but in order to keep the inside of the furnace at this temperature, the air for indirect heating needs to have a sufficiently high temperature. In addition, when the temperature of the heating air is as high as possible, the temperature difference from the atmosphere in the gasification furnace increases, and the heat transfer efficiency improves, so that the heat transfer area can be reduced.
  • High-temperature air r 2 can be easily obtained, so that the gasification furnace can be effectively heated.
  • the air r 3 after heating the gasification furnace is Although it is shown to be used as combustion air, it may be reused for other purposes such as reheating exhaust gas to prevent white smoke and heating boiler feed water.
  • a method may be used in which part of the high-temperature air r2 obtained by the high-temperature air heater is used for heating the gasification furnace, and the remainder is used as combustion air for the melting furnace.
  • the eighth embodiment of the present invention relates to a waste heat boiler 104 shown in FIG. 3, including a boiler heat transfer tube 104a, a steam superheater heat transfer tube 104b, a heat transfer tube support, a protector, and the like.
  • the member is formed by using the above-mentioned high-temperature corrosion-resistant alloy, and details thereof are shown in FIGS. 3 and 20.
  • the waste heat poirer in the latter stage of the fluidized bed gasification and melting furnace is described.
  • the type of the furnace is not necessarily limited to this.
  • Other types of gasification / melting furnaces, such as G-type melting furnaces, and incinerators of the storage-force type or fluidized-bed type may be used.
  • the parts that may be used for the high-temperature corrosion-resistant alloy are boiler heat transfer tubes 104a and steam superheater heat transfer tubes 104b. Conceivable.
  • the heat transfer tubes 1 0 4 fit a or 1 0 4 b operating temperature, as the temperature of a good c superheated steam to adjust the component, Generally, the upper limit is about 50.0 to 600 ° C, so it is sufficient if the upper limit of the operating temperature of the material is about 700 ° C. In this case, since the inside is high-pressure saturated water or steam, the alloy used must have sufficient pressure resistance. Therefore, the composition should contain 0.3 to 1% of Si, 2% of A1 and 8 to 15% of W by mass%, so that the severe corrosion area around 800 ° C It is desirable to improve the high-temperature strength instead of reducing the corrosion resistance.
  • boiler heat transfer tubes 104a steam superheater heat transfer tubes 1
  • support members such as 0 4 b
  • the support member since the inside is not cooled by steam or saturated water like the heat transfer tube 104a or 104b, the temperature is generally set to 104a or 104b.
  • the above-mentioned high-temperature corrosion-resistant alloy exhibits superior corrosion resistance, particularly in the high-temperature range of 800 to 1200 ° C, as compared with conventional materials. Higher reliability and durability can be expected.
  • the embodiment shown in FIG. 20 is an example in which the protector is made of the above-mentioned high-temperature corrosion-resistant alloy in order to solve this.
  • a protector 66 made of the above-mentioned high-temperature corrosion-resistant alloy is attached so as to protect the surface of the heat transfer tube 65.
  • the protector 66 has a semi-cylindrical shape.
  • the protector 66 may have a flat shape to protect the plurality of heat transfer tubes 65.
  • the specific alloy composition does not particularly require pressure resistance, so it is important to adjust the components according to the respective operating temperature and corrosion environment.
  • the operating temperature is about 500 to 700 ° C, of the above alloys, 0.3% to 1% of S i, 2% of A 1, and the total amount of W and M To 8% or less, the amount of W added can be reduced and cost can be reduced. it can.
  • the temperature is about 700 to 100 ° C., the content of Si is 1 to 4%, A 1 is 2%, and the total amount of W and Mo is 8 to 15%. Corrosion resistance can be improved.
  • the temperature is about 1 000 to 1200 ° C, 31 contains 0.3 to 0.3%: L%, A1 contains 2 to 7%, and the total amount of W and Mo contains 8 to 15%. By doing so, the high-temperature strength can be improved.
  • a heat transfer tube for heating a kiln furnace such as a kiln-type gasifier in a waste kiln-type gasification-melting apparatus is configured by the high-temperature corrosion-resistant alloy
  • Figure 21 shows the details.
  • the input waste a is heated by the high-temperature fluid u flowing in the heat transfer tube 71 to be pyrolyzed and gasified.
  • Pyrolysis gas b generated by pyrolysis gasification mainly contains hydrogen, carbon monoxide, hydrocarbons, etc.
  • the material of the heat transfer tube 71 is required to have sufficient corrosion resistance because it is corrosive due to being generated as hydrogen chloride gas and hydrogen sulfide gas. Therefore, if the corrosion resistance is insufficient, the heat transfer tubes 71 need to be frequently replaced. Since kiln-type gasification furnaces are generally very long devices, replacing the heat transfer tubes 71 requires a large work space and a large amount of work time, and there are problems in terms of furnace site area, operating costs, and the like. I got it.
  • the optimum temperature for pyrolysis gasification of wastes depends on the nature of the wastes, but is generally 400 to 10000 ° C, preferably 500 to 600 ° C. (: Is appropriate ( Assuming that the gasification temperature is 500 ° C and the temperature of the high-temperature fluid u flowing through the heat transfer tube 71 is 700 ° C, the temperature of the heat transfer tube 71 is approximately 600 on average. In other words, as shown in Fig. 1, conventional carbon steel and stainless steel are exposed to extremely severe hot corrosion. Conventionally, measures have been taken to protect the heat transfer tube surface from exposure to corrosive gas by protecting the heat transfer tube surface with a refractory material, and to attach a protector to the heat transfer tube surface. Since the heat transfer efficiency is reduced by protection with materials or protectors, there is a problem that the heat transfer area increases and the entire device becomes very large.
  • the high-temperature corrosion-resistant alloy according to the present invention exhibits extremely excellent corrosion resistance in such a high-temperature corrosive gas environment of about 600 ° C. as compared with conventional materials.
  • the refractory and the protector can be omitted, and the heat transfer efficiency can be improved.
  • the size of the device can be reduced, and the installation space can be reduced.
  • the durability of the heat transfer tubes 71 is increased, the work of replacing the heat transfer tubes 71 is not required, or the number of such operations can be significantly reduced.
  • the specific alloy composition since particularly high mechanical strength is not required for the heat transfer tube 71, it is preferable to adjust the components according to the operating temperature and the corrosive environment. For example, if the operating temperature is about 500 to 700 ° C, of the above alloys, 0.3% to 1% of S i, 2% of A 1, and the total amount of W and M When the content is 8% or less, the amount of W added can be reduced and cost can be reduced. If the temperature is about 700 to 100 ° C., S i:! Corrosion resistance can be improved by containing up to 4%, A1 2%, and W 8 to 15%.
  • a tenth embodiment of the present invention is to install a fluidized bed incinerator or gasification furnace on a free-portion member, heat organic waste such as wood in a low-oxygen state and carbonize the waste.
  • the above-mentioned high-temperature corrosion-resistant alloy is applied to a recovery device, and the details are shown in FIG.
  • Fig. 22 shows an example of this.
  • the carbonized raw material V which is organic waste such as wood, is supplied to the carbonized drum installed in the free board section 101a of the fluidized bed gasifier 101. 72, and heated by the pyrolysis gas b in the gasification furnace and carbonized.
  • Pyrolysis gas b are the gas that occurred by the combustion of waste, c contain corrosive components such as hydrogen chloride in a large amount also its temperature is generally 6 0 0 ⁇ : L 0 0 0 ° C, preferably about 700 to 900 ° C., the material of the carbonized drum 72 is required to have sufficient corrosion resistance in such a high-temperature corrosive gas atmosphere. Further, when the carbonized raw material V is carbonized inside the carbonized drum 72, a pyrolysis gas w is generated. This pyrolysis gas w is indirectly cooled by cooling water h to condense a part of it and collect wood vinegar and the like from the condensed liquid. A device 75 is provided. The properties of the pyrolysis gas w vary depending on the type of the carbonized raw material V. However, it is possible that corrosive components such as chlorine and sulfur are contained. 2 progresses corrosion not only from the outside but also from the inside.
  • the above-mentioned high-temperature corrosion-resistant alloy is suitable for use in such a high-temperature corrosive gas atmosphere, and by forming the carbonized drum 72 from this high-temperature corrosion-resistant alloy, a general material such as stainless steel can be used.
  • the durability of the carbonized drum 72 can be greatly improved as compared with the case where it is used.
  • the screw shaft 73 and the screw blades 74 rotate inside the carbonization drum 72, and the carbonization raw material V and the carbonization drum 72, Since the abrasion occurs with the screw blades 74, the abrasion resistance is required to some extent. Further, if deformation of the drum occurs, the rotation of the screw shaft 73 and the screw blade 74 is hindered.
  • the alloy composition since the operating temperature is about 700 to 100 ° C., the alloy composition must be able to reduce severe corrosion at around 900 ° C. From the above, it is desirable that the present material should contain 1 to 4% of Si, 2% of A1, and 8 to 15% of the total amount of W and Mo in mass%.
  • the eleventh embodiment of the present invention is an example in which the above high-temperature corrosion-resistant alloy is applied to a grate of a storage-force incinerator, the details of which are shown in FIG.
  • the storage-powered incinerator mechanically moves a stepped grate 81 by a grate driving cylinder 82 to dry the waste a put on the grate 81, It is sequentially moved to the gasification and combustion processes and incinerated.
  • the combustion temperature in a single-strength incinerator is about 900 ° C on average.
  • the grate should be cooled to about 400 to 500 ° C as an air-cooled or water-cooled structure. Thereby, the durability is improved. However, the above temperature is average, and the grate temperature may reach a high temperature of 600 to 700 ° C locally due to uneven combustion of waste.
  • heat-resistant steel or heat-resistant alloy is used as the material for the grate 81, but these materials have sufficient mechanical strength up to a temperature range of 600 to 700 ° C.
  • the waste a moves directly on the grate, causing friction with the waste a.
  • abrasion resistance Is done.
  • the grate 81 is generally used as a consumable item to replace a severely damaged portion during a periodic inspection of the furnace.
  • the material of the grate 81 be as low in cost as possible and exhibit excellent durability, and a slight decrease in durability leads to a significant increase in the operating cost of the furnace. There is.
  • the above-mentioned high-temperature corrosion-resistant alloy has extremely high high-temperature corrosion resistance compared to conventional heat-resistant steel or heat-resistant alloy in a temperature range of up to 800 to 1200 ° C. Therefore, by configuring the grate 81 using this alloy, the durability of the grate 81 can be greatly increased as compared with the conventional case, and the operating cost of the furnace can be reduced. .
  • the grate is required to have a certain high-temperature strength in consideration of the fact that the grate is a movable part and abrasion with waste. Since the maximum operating temperature is about 600 to 700 ° C-Of this material, 0.3 to 1% of Si, 0.3 to 1% of A1, 2% of A1, and 8% or less of W Therefore, it is desirable to reduce the cost by adding W. In the above temperature range, the addition of Mo is particularly effective in improving corrosion resistance and high-temperature strength, so that 31 is 0.3 to 1%, A1 is 2%, and Mo is 8% or less. By containing it, superior corrosion resistance and high-temperature strength can be obtained as compared with conventional materials.
  • the 12th embodiment of the present invention is, as a more general example, an example in which the above-mentioned high-temperature corrosion-resistant alloy is used as a material for a pipe or duct for handling a high-temperature corrosive gas.
  • the material of pipes or ducts carbon steel is generally used up to about 300 ° C, and stainless steel is used up to about 300 to 700 ° C.
  • high-temperature gas of 700 to 100 ° C for example, there is no metal material that can be used as piping material and there is no inexpensive material, and refractory or heat insulating material must be installed on the inner surface of the piping or duct. This prevented the material from becoming hot and causing a drop in strength.
  • the fluid being handled is a high-temperature corrosive gas containing a large amount of hydrogen chloride, etc.
  • the higher the gas temperature the more severe the corrosion.
  • the piping members were prevented from coming into direct contact with hot corrosive gas.
  • the pipe diameter increases by the thickness of the refractory or heat insulating material, which increases the price of the pipe and increases the installation space for the pipe.
  • the weight of the refractories increases, so it is necessary to increase the strength of the support for supporting the pipes, the frame, and the like, and there is a problem that the construction cost of the entire plant increases.
  • the high-temperature corrosion-resistant alloy has excellent corrosion resistance and high-temperature strength not only in a temperature range of 300 to 700 ° C but also in a high-temperature corrosive gas of 700 to 1200 ° C. Because of this, when this alloy is used, it is possible to construct a piping that handles the above-mentioned high-temperature corrosive gas without having to install refractory or heat insulating material on the inner surface. In order to prevent the temperature of the internal high-temperature corrosive gas from lowering due to heat radiation, it is desirable to install a heat insulating material.However, unlike the conventional heat insulating material, the purpose of the heat insulating material is not to prevent the temperature of the piping member from rising.
  • Insulation material can be installed outside the building. In this case, there is an advantage that repair and replacement during construction and use are easier than when a heat insulating material is attached inside the pipe as in the past.
  • the specific alloy composition of the present alloy it is preferable to adjust the components according to the temperature and pressure of the fluid flowing through the part and the content of the corrosive components. For example, if the operating temperature is about 500 to 700 ° C., 0.3% to 1% of Si, 2% of A1, and 8% or less of W are contained in the above alloys by mass%. By doing so, the amount of W added can be reduced and low cost can be achieved.
  • the temperature is about 700 ° C: L 0000 ° C, it contains 1 to 4% of Si, 2 to 7% of A1, and 8 to 15% of the total amount of W and Mo. By doing so, the corrosion resistance can be improved. Furthermore, if the temperature is about 100 to 1200 ° C, the content of Si should be 0.3 to 1%, A1 should be 2 to 7%, and W should be 8 to 15%. Thus, high-temperature strength and corrosion resistance can be improved.
  • the thirteenth embodiment of the present invention is an example in which the above-mentioned high-temperature corrosion-resistant alloy is used as a material for a flow rate control valve or a damper in a pipeline for handling a high-temperature corrosive gas.
  • a material of a valve or a damper generally, iron or brass is used up to about 300 ° C, and stainless cycling is used up to about 300 to 700 ° C. For high temperatures of, for example, 700 to 1200 ° C., high-grade materials had to be used.
  • the fluid to be handled is a high-temperature corrosive gas containing a large amount of hydrogen chloride, etc.
  • the higher the gas temperature the more severe the corrosion will occur.
  • use a high-grade material such as A11oy625.
  • the high-temperature corrosion-resistant alloy exhibits excellent corrosion resistance not only in a temperature range of about 300 to 700 ° C but also in a high-temperature corrosive gas of about 700 to 1200 ° C. Therefore, a valve or damper capable of adjusting the flow rate of a high-temperature corrosive gas up to about 1200 ° C., which was impossible in the past, by providing a valve and a damper using the present alloy is provided. Can be.
  • the specific composition of the alloy it is better to adjust the components according to the temperature and pressure of the fluid flowing inside and the content of corrosive components, as in the case of the above-mentioned piping.
  • the operating temperature is about 500 to 700 ° C, of the above alloys, Si is 0.3 to 0.3% by mass%: L%, A1 is 2%, and W is 8% or less. By containing it, the amount of W added can be reduced and cost can be reduced.
  • the temperature is about 700 to 100 ° C, it should be 1 to 4% for Si, 2 to 7% for A1, and 8 to 15% for the total amount of W and Mo. By doing so, the corrosion resistance can be improved.
  • the temperature is about 1000 to 1200 ° C, the content of Si should be 0.3 to 1%, A1 should be 2 to 7%, and W should be 8 to 15%. The high temperature strength can be improved.
  • the pulp or damper body is manufactured by manufacturing, and the main internal parts are manufactured by manufacturing or by manufacturing, etc.
  • the portion in contact with the hot corrosion gas must be made of the hot corrosion resistant alloy according to the present invention.
  • the fifteenth embodiment of the present invention is an example in which the above-mentioned high-temperature corrosion-resistant alloy is used as a material for a fan or a pipe in a pipe for handling a high-temperature corrosive gas.
  • the material in contact with the gas to be handled such as the casing of a fan or blower, impeller, etc.
  • the material in contact with the gas to be handled is iron or the like up to about 300 ° C, and stainless steel or the like at about 300 to 700 ° C. It is common to use Higher materials had to be used for higher temperatures, for example, 700-1200 ° C hot gases.
  • the fluid to be handled is a high-temperature corrosive gas containing a large amount of hydrogen chloride, etc.
  • the higher the gas temperature the more severe the corrosion will occur.
  • a high-grade material such as A11oy625.
  • long-term durability was very difficult.
  • the high-temperature corrosion-resistant alloy described above exhibits excellent corrosion resistance not only in the temperature range of about 300 to 700 ° C but also in the high-temperature corrosive gas of about 700 to 1200 ° C.
  • By composing the fan or the member of the probe using the alloy it is possible to provide a fan or a probe corresponding to a high-temperature corrosive gas up to about 1200 ° C., which was impossible in the past.
  • the components it is preferable to adjust the components according to the temperature and pressure of the fluid flowing inside and the content of the corrosive components, as in the case of the pipes and the like.
  • the operating temperature is about 500 to 700 ° C.
  • 0.3% to 1% of 3i, 2% of A1, and 8% or less of W are contained in the above alloys by mass%.
  • the temperature is about 700-: L 000 ° C, it should contain 1 to 4% of Si, 2 to 7% of A1, and 8 to 15% of the total amount of W and Mo.
  • the corrosion resistance can be improved.
  • the temperature is about 1000 to 1200 ° C, the temperature is increased by including 0.3 to 1% of Si, 2 to 7% of A1, and 8 to 15% of W. Strength can be improved.
  • the 12th to 14th embodiments are examples of pipes that generally handle high-temperature corrosive gases, which were difficult to handle in the past, and were impossible in the past by combining them. Process becomes possible.
  • such an embodiment will be described with reference to FIGS. 24 to 26.
  • Fig. 24 is for waste material consisting of a gasification furnace and a melting furnace.
  • gasification melting furnace an example is shown in which a damper made of the present alloy is used in a system including two gasification furnaces 101 and one swirling melting furnace 102.
  • the unsuitable combustion is sorted out in the gasifier 101 and discharged from the lower part. It becomes smaller as compared to the gasifier 101. In this case, if the load of the melting furnace 102 is too small, the ratio of heat dissipation loss to the amount of heat generated by combustion increases, and the amount of auxiliary combustion becomes excessive for stable ash melting. There's a problem.
  • the unsuitable material is a metal wire or the like and it becomes clogged during discharge, etc., and if the gasifier 101 stops due to a problem, the melting furnace 102 must also be stopped. There is a problem.
  • one melting furnace is used for two gasification furnaces, and the load balance between the gasification furnace and the melting furnace is appropriately balanced. Even if one of the gasifiers shuts down due to one trouble, the waste treatment can be continued by the other gasifier.
  • the pressure is adjusted just before the melting furnace inlet to absorb the pressure difference between the two gasifiers 101a and 101b. Dumbers 85a and 85b are required. Further, the dampers 85a and 85b are used to stop the gasifier while the other is operating while the other is stopped. Necessary for isolation.
  • the pyrolysis gas b at the gasifier outlet has a temperature of 400 to 100 ° C., preferably 800 to 900 ° C., and contains ash, Until now, a damper that can be used in such an environment has been difficult to put into practical use.
  • the high-temperature corrosion-resistant alloy has excellent corrosion resistance even in such an environment, Since it also has an appropriate high-temperature strength, the above-described system can be realized by using the damper made of the present alloy as the dampers 85a and 85b in FIG.
  • a part of the high-temperature exhaust gas is branched after the melting furnace 102 and used as a flowing gas of the gasification furnace.
  • An example is shown.
  • the combustion exhaust gas is also extremely high at 1200 ° C.
  • the amount of exhaust gas it is also possible to reduce the amount of exhaust gas, and it is possible to realize a gasification and melting system that is superior to conventional systems in terms of energy efficiency and environmental load.
  • the embodiment shown in FIG. 25 is an example of a simple method that can be considered for realizing the above, and the high temperature of, for example, 800 to 120 ° C. after the outlet of the melting furnace 102 is obtained. A part of the combustion exhaust gas g1 is extracted and used as fluidized gas g2 in a fluidized bed gasifier.
  • the high-temperature flue gas g 1 extracted after the outlet of the melting furnace 102 is also at a negative pressure.
  • the fluidizing gas g 2 needs to have a sufficient positive pressure to blow into the furnace against the pressure loss due to the fluidized sand. For this reason, in order to realize the process shown in FIG. 25, it is necessary to increase the pressure of the high-temperature flue gas g1 by the pro-86. From now on, it has been difficult to commercialize a probe having sufficient high-temperature strength and corrosion resistance that can be used for, for example, combustion exhaust gas g1 at a high temperature of 800 to 1200 ° C.
  • the flow rate of the fluidizing gas g2 needs to be controlled in accordance with the temperature, the flow state, etc. of the fluidized-bed gasifier 101, so that the flow control damper 85c Conventionally, it has been difficult to commercialize a damper having sufficient high-temperature strength and corrosion resistance that can be used for a high-temperature flue gas g1 at 800 to 1200 ° C, for example.
  • blower 86 using the high-temperature corrosion resistant alloy according to the present invention in the above Example 14 was used as a blower 86 in FIG. 25, and the damper using the high temperature corrosion resistant alloy according to the present invention in the above Example 13 was used.
  • the damper 85 c in FIG. 25 the above problem can be solved and the process shown in FIG. 25 can be realized.
  • FIG. 26 shows an example in which a part of the high-temperature exhaust gas is passed to the slag discharge part in the waste gasification and melting furnace in order to prevent the cooling of the slag discharge part.
  • the high-temperature molten slag comes into contact with the cooling water in the slag cooling device 112, and the cooling water is heated and evaporated. Steam is generated. In the absence of the pump 87 shown in Fig. 26, the generated low-temperature steam is exhausted along with the exhaust gas. The slag cools and solidifies in the part, which adversely affects slag discharge.
  • a blower 87 is installed as shown in Fig. 26, and a part d1 of the combustion exhaust gas d in the melting furnace is passed through the slag discharge unit 1 1 1 1 1 2 and the combustion exhaust gas d and the steam X generated by slag cooling are melted via the damper 85 d and the pro ⁇ 87 By discharging to the downstream part of the furnace 102, the slag discharge part 111 can be prevented from being cooled.
  • the plumber 87 and the piping before and after it are exposed to the high-temperature corrosive gas d2 that is a mixture of the combustion exhaust gas d and the steam X, there is a problem in terms of corrosion resistance when using conventional metal materials. was there.
  • the above-mentioned high-temperature corrosion-resistant alloy has extremely high high-temperature corrosion resistance compared to conventional heat-resistant steel or heat-resistant alloy in a temperature range of up to 800 to 1200 ° C. Therefore, the durability of the blower 87 can be significantly improved by configuring the blower 87 and the piping before and after the blower 87 with the high-temperature corrosion-resistant alloy.
  • the nozzle 110 in which the high-temperature corrosive gas d2 passed through the blower 87 is recharged into the melting furnace 102 has the structure shown in FIG. 17 or FIG. 18 in the third embodiment. This can solve problems such as nozzle durability and blockage due to solidification of slag.
  • the damper 85 d is also made of the high-temperature corrosion-resistant alloy.
  • the high-temperature corrosive gas d2 is a gas obtained by mixing the high-temperature flue gas d1 and the low-temperature steam X, its temperature greatly changes depending on the amount of generated steam X (that is, the amount of discharged slag c). For this reason, it is desirable to determine the amount of slag c and the amount of steam X according to the properties of the target waste, and to determine the temperature of the hot corrosive gas d2 based on that.
  • the specific material composition of the pipe 87, the piping before and after, the nozzle 110, etc. will be selected according to the temperature of the hot corrosive gas d2.
  • the gas temperature is about 500 to 700 ° C, of the above alloys, 0.3% to 1% of S i, 2% to 7% of A 1, and the sum of W and Mo in mass% By reducing the content to 8% or less, cost reduction can be achieved.
  • the temperature is about 700 to 100 ° C, it contains 1 to 4% of Si, 2 to 7% of A1, and 8 to 15% of the total amount of W and Mo. By doing so, the corrosion resistance can be improved.
  • an alloy having excellent high-temperature corrosion resistance and exhibiting excellent durability particularly in a severely corrosive environment containing a large amount of chlorine can be produced by incineration of solid fuel such as waste or coal.
  • the durability, reliability, cost, etc. of the apparatus can be improved by using the members constituting the apparatus and the parts of the equipment that require corrosion resistance to high-temperature corrosive gas. be able to.
  • a portion which is subjected to strong corrosion such as simultaneous occurrence of chloride corrosion and sulfide corrosion with increasing temperature is formed using an alloy having excellent high-temperature corrosion resistance.
  • strong corrosion such as simultaneous occurrence of chloride corrosion and sulfide corrosion with increasing temperature is formed using an alloy having excellent high-temperature corrosion resistance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

La présente invention concerne un dispositif permettant l'incinération ou la gazéification d'un combustible résiduaire ou solide, tel que la houille. Ce dispositif se caractérise en ce que l'alliage de nickel contenant Cr, Si, W ou Mo, et Al est utilisé pour un élément ou pour un appareil faisant partie du dispositif. Le dispositif présente un fonctionnement et une durabilité améliorées par rapport à un appareil classique, grâce à un matériau présentant une excellente résistance à la corrosion à haute température utilisé dans une section du dispositif et qui exige une résistance à la corrosion à haute température.
PCT/JP2001/009339 2000-10-25 2001-10-24 Dispositif d'incineration ou de gazeification utilisant un alliage resistant a la corrosion a haute temperature WO2002035151A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002210937A AU2002210937A1 (en) 2000-10-25 2001-10-24 Apparatus for incineration or gasification using high temperature corrosion resistant alloy
JP2002538101A JPWO2002035151A1 (ja) 2000-10-25 2001-10-24 耐高温腐食合金を用いた焼却またはガス化装置

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JP2000325794 2000-10-25
JP2000-325794 2000-10-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004069102A (ja) * 2002-08-02 2004-03-04 Mitsuro Takahama 複筒式熱交換器
WO2005040439A1 (fr) * 2003-10-28 2005-05-06 Ebara Corporation Incinerateur et gazogene
JP2007005059A (ja) * 2005-06-22 2007-01-11 Ebara Corp プラズマ式溶融炉
JP2015059674A (ja) * 2013-09-17 2015-03-30 住友重機械工業株式会社 耐摩耗板
CN110608992A (zh) * 2019-10-17 2019-12-24 浙江大学 一种测试垃圾焚烧锅炉受热面金属材料耐高温腐蚀性能的探针装置及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5010720A (fr) * 1973-06-04 1975-02-04
JPS5040099B1 (fr) * 1971-03-09 1975-12-22
JPH09108888A (ja) * 1995-10-18 1997-04-28 Kobe Steel Ltd 粉体肉盛溶接用材料
JPH11226778A (ja) * 1998-02-09 1999-08-24 Ing Shoji Kk 肉盛り溶接材料及び肉盛りクラッド材
JP2000213721A (ja) * 1999-01-21 2000-08-02 Nisshin Steel Co Ltd 耐食性に優れた焼却炉体および焼却炉付帯設備

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040099B1 (fr) * 1971-03-09 1975-12-22
JPS5010720A (fr) * 1973-06-04 1975-02-04
JPH09108888A (ja) * 1995-10-18 1997-04-28 Kobe Steel Ltd 粉体肉盛溶接用材料
JPH11226778A (ja) * 1998-02-09 1999-08-24 Ing Shoji Kk 肉盛り溶接材料及び肉盛りクラッド材
JP2000213721A (ja) * 1999-01-21 2000-08-02 Nisshin Steel Co Ltd 耐食性に優れた焼却炉体および焼却炉付帯設備

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004069102A (ja) * 2002-08-02 2004-03-04 Mitsuro Takahama 複筒式熱交換器
WO2005040439A1 (fr) * 2003-10-28 2005-05-06 Ebara Corporation Incinerateur et gazogene
JP2007005059A (ja) * 2005-06-22 2007-01-11 Ebara Corp プラズマ式溶融炉
JP2015059674A (ja) * 2013-09-17 2015-03-30 住友重機械工業株式会社 耐摩耗板
CN110608992A (zh) * 2019-10-17 2019-12-24 浙江大学 一种测试垃圾焚烧锅炉受热面金属材料耐高温腐蚀性能的探针装置及方法

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AU2002210937A1 (en) 2002-05-06

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