WO2017042895A1 - Système de génération d'énergie thermique - Google Patents

Système de génération d'énergie thermique Download PDF

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Publication number
WO2017042895A1
WO2017042895A1 PCT/JP2015/075515 JP2015075515W WO2017042895A1 WO 2017042895 A1 WO2017042895 A1 WO 2017042895A1 JP 2015075515 W JP2015075515 W JP 2015075515W WO 2017042895 A1 WO2017042895 A1 WO 2017042895A1
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Prior art keywords
denitration
exhaust gas
thermal power
power generation
generation system
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PCT/JP2015/075515
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English (en)
Japanese (ja)
Inventor
英嗣 清永
健治 引野
啓一郎 盛田
春田　正毅
徹 村山
真 美濃
Original Assignee
中国電力株式会社
公立大学法人首都大学東京
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Priority to PCT/JP2015/075515 priority Critical patent/WO2017042895A1/fr
Priority to JP2016550662A priority patent/JP6077190B1/ja
Publication of WO2017042895A1 publication Critical patent/WO2017042895A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/66—Silver or gold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes

Definitions

  • the present invention relates to a thermal power generation system. More specifically, the present invention relates to a thermal power generation system including a boiler, an exhaust passage through which exhaust gas flows, a desulfurization device that removes sulfur oxide from the exhaust gas, and a denitration device that removes nitrogen oxide from the exhaust gas.
  • thermal energy obtained by burning fuel such as coal in a boiler is converted into electric energy by a turbine. Further, when fuel is burned in a boiler of a thermal power plant, exhaust gas containing sulfur oxides and nitrogen oxides is generated.
  • the exhaust gas generated in the boiler of the thermal power plant is discharged from the boiler through the exhaust passage. From the exhaust gas discharged to the outside from the boiler, sulfur oxides and nitrogen oxides are removed by a desulfurization device and a denitration device, respectively, in consideration of the environment.
  • denitration catalysts such as vanadium / titanium catalysts (V 2 O 5 / TiO 2 ) are generally used in desulfurization apparatuses that remove nitrogen oxides from exhaust gas.
  • the vanadium / titanium catalyst exhibits high catalytic activity in a high temperature (for example, about 370 ° C.) environment. Therefore, in a thermal power plant, the denitration device is used in the vicinity of the exhaust gas outlet in the boiler, It arrange
  • the vicinity of the exhaust gas outlet in the boiler and the upstream side of the exhaust passage are in a high-temperature environment as described above, and the coal ash and the S content are present in high concentrations. It is also an environment where it is easy to progress. If the denitration catalyst is rapidly deteriorated, the replacement frequency of the denitration catalyst is increased, so that the operating cost of the thermal power plant tends to increase.
  • the denitration device when nitrogen oxides are removed from the exhaust gas by the selective catalytic reduction method, ammonia used as a reducing agent leaks from the denitration device as the denitration catalyst deteriorates.
  • ammonia leaks from the denitration device ammonium sulfate reacts with the S component in the exhaust gas, and ammonium sulfate is generated, and the ammonium sulfate adheres to the air preheater disposed on the secondary side of the denitration device. In this way, when ammonium sulfate adheres and accumulates on the air preheater, it is necessary to clean the air preheater to prevent clogging of the exhaust gas flow path, which further increases the operating cost of the thermal power plant. Become.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a thermal power generation system with low operating costs because it is difficult for the denitration catalyst used in the denitration apparatus to progress.
  • the present invention includes a boiler for burning fuel, an exhaust passage through which exhaust gas generated by the combustion of fuel in the boiler flows, and a desulfurization device that is disposed in the exhaust passage and removes sulfur oxide from the exhaust gas. And a denitration device that is disposed in the exhaust passage and removes nitrogen oxides from the exhaust gas by a denitration catalyst, wherein the denitration device is disposed downstream of the desulfurization device in the exhaust passage.
  • the denitration catalyst relates to a thermal power generation system having gold fine particles.
  • a heater that is disposed between the desulfurization device and the denitration device in the exhaust passage and heats the exhaust gas.
  • the denitration catalyst is preferably a catalyst in which gold fine particles are dispersed or fixed on a carrier made of a metal oxide.
  • the metal oxide is preferably at least one base metal oxide selected from the group consisting of zirconium oxide, cerium oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, manganese oxide and zinc oxide.
  • the gold fine particles are preferably gold nanoparticles or gold clusters having an average particle diameter of 50 nm or less.
  • the denitration apparatus removes nitrogen oxides from the exhaust gas by a selective catalytic reduction method.
  • the fuel is preferably coal.
  • FIG. 1 is a diagram illustrating a configuration of a thermal power generation system 1 according to the present embodiment.
  • the thermal power generation system 1 includes a boiler 10, a pulverized coal machine 20, an exhaust path L1, an air preheater 30, a gas heater 40 as a heat recovery device, an electric dust collector 50, An induction ventilator 60, a desulfurization device 70, a gas heater 80 as a heater, a denitration device 90, and a chimney 100 are provided.
  • the boiler 10 burns pulverized coal as fuel together with air.
  • exhaust gas is generated by the combustion of pulverized coal.
  • coal ash such as clinker ash and fly ash, produces
  • the clinker ash generated in the boiler 10 is discharged to a clinker hopper 11 disposed below the boiler 10 and then conveyed to a coal ash recovery silo (not shown).
  • the boiler 10 is formed in a substantially inverted U shape as a whole.
  • the exhaust gas generated in the boiler 10 moves in an inverted U shape along the shape of the boiler 10.
  • the temperature of the exhaust gas in the vicinity of the exhaust gas outlet of the boiler 10 is, for example, 300 to 400 ° C.
  • the pulverized coal machine 20 pulverizes coal supplied from a coal bunker (not shown) to a fine particle size to form pulverized coal.
  • the pulverized coal machine 20 preheats and dries the pulverized coal by mixing the pulverized coal and air.
  • the pulverized coal formed in the pulverized coal machine 20 is supplied to the boiler 10 by blowing air.
  • the upstream side of the exhaust passage L1 is connected to the boiler 10.
  • the exhaust passage L1 is a passage through which exhaust gas generated in the boiler 10 flows.
  • the air preheater 30 is disposed in the exhaust path L1.
  • the air preheater 30 performs heat exchange between exhaust gas and combustion air fed from a not-shown push-type ventilator, and recovers heat from the exhaust gas.
  • the combustion air is heated in the air preheater 30 and then supplied to the boiler 10.
  • the gas heater 40 is disposed downstream of the air preheater 30 in the exhaust path L1.
  • the exhaust gas recovered by the air preheater 30 is supplied to the gas heater 40.
  • the gas heater 40 further recovers heat from the exhaust gas.
  • the electric dust collector 50 is disposed on the downstream side of the gas heater 40 in the exhaust passage L1.
  • the exhaust gas recovered by the gas heater 40 is supplied to the electric dust collector 50.
  • the electric dust collector 50 is a device that collects coal ash (fly ash) in exhaust gas by applying a voltage to electrodes.
  • the fly ash collected in the electric dust collector 50 is conveyed to a coal ash collection silo (not shown).
  • the temperature of the exhaust gas in the electric dust collector 50 is, for example, 80 to 120 ° C.
  • the induction fan 60 is disposed on the downstream side of the electric dust collector 50 in the exhaust path L1.
  • the induction ventilator 60 takes in the exhaust gas from which fly ash has been removed in the electric dust collector 50 from the primary side and sends it out to the secondary side.
  • the desulfurization device 70 is disposed on the downstream side of the induction fan 60 in the exhaust passage L1.
  • the desulfurization apparatus 70 is supplied with the exhaust gas sent from the induction fan 60.
  • the desulfurization device 70 removes sulfur oxide from the exhaust gas.
  • the desulfurization apparatus 70 removes sulfur oxide from the exhaust gas by spraying a mixed liquid (limestone slurry) of limestone and water onto the exhaust gas, thereby absorbing the sulfur oxide contained in the exhaust gas into the mixed liquid.
  • the temperature of the exhaust gas in the desulfurizer 70 is, for example, 50 to 120 ° C.
  • the gas heater 80 is disposed on the downstream side of the desulfurization device 70 in the exhaust passage L1.
  • the gas heater 80 is supplied with exhaust gas from which sulfur oxides have been removed in the desulfurization apparatus 70.
  • the gas heater 80 heats the exhaust gas.
  • the gas heater 40 and the gas heater 80 are an exhaust gas flowing between the air preheater 30 and the electric dust collector 50 and an exhaust gas flowing between the desulfurization device 70 and a denitration device 90 described later in the exhaust passage L1. You may comprise as a gas gas heater which heat-exchanges between.
  • the denitration device 90 is disposed downstream of the gas heater 80 in the exhaust path L1.
  • the exhaust gas heated in the gas heater 80 is supplied to the denitration device 90.
  • the denitration device 90 removes nitrogen oxides from the exhaust gas using a denitration catalyst.
  • the denitration catalyst used in the denitration apparatus 90 will be described in detail later.
  • the temperature of the exhaust gas in the denitration apparatus 90 is, for example, 130 to 250 ° C.
  • nitrogen oxides are removed from the exhaust gas by a selective catalytic reduction method.
  • nitrogen oxides can be efficiently removed from exhaust gas by generating nitrogen and water from nitrogen oxides using a reducing agent and a denitration catalyst.
  • the reducing agent used in the selective catalytic reduction method includes at least one of ammonia and urea. When ammonia is used as the reducing agent, ammonia in any state of ammonia gas, liquid ammonia, and aqueous ammonia solution may be used.
  • the denitration apparatus 90 injects ammonia gas into the introduced exhaust gas, and then mixes the mixed gas with a honeycomb molded body to which the denitration catalyst is fixed, an alumina fiber carrying the denitration catalyst, or the like. It can be set as the structure made to contact a fiber.
  • the chimney 100 is connected to the downstream side of the exhaust path L1. Exhaust gas from which nitrogen oxides have been removed by the denitration apparatus 90 is introduced into the chimney 100. Since the exhaust gas introduced into the chimney 100 is heated by the gas heater 80, it is effectively discharged from the upper part of the chimney 100 by the chimney effect. Further, when the exhaust gas is heated in the gas heater 80, it is possible to prevent water vapor from condensing above the chimney 100 and generating white smoke.
  • the temperature of the exhaust gas near the exit of the chimney 100 is, for example, 110 ° C.
  • the denitration catalyst has gold fine particles.
  • a denitration catalyst having gold fine particles can exhibit a high denitration effect even in a low temperature environment as compared with a conventional denitration catalyst such as a vanadium / titanium catalyst.
  • the gold fine particles in the denitration catalyst are preferably gold nanoparticles or gold clusters having an average particle size of 50 nm or less (hereinafter, gold nanoparticles and gold clusters are collectively referred to as “gold nanoparticles”).
  • gold nanoparticles When the average particle diameter of the gold fine particles is 50 nm or less, the denitration efficiency of the denitration catalyst is further improved.
  • the gold fine particles preferably have an average particle size of 10 nm or less, and more preferably have an average particle size of 5 nm or less.
  • the average particle size of the gold fine particles is determined by observing the metal fine particles with a scanning electron microscope (SEM) or a transmission electron microscope (TEM) and determining the particle size of an arbitrary number (for example, 20 to 100) of metal fine particles. And it can obtain
  • SEM scanning electron microscope
  • TEM transmission electron microscope
  • the denitration catalyst is preferably a catalyst in which gold fine particles (gold nanoparticles) are dispersed or fixed on a carrier made of a metal oxide.
  • the performance as a denitration catalyst is improved by dispersing or fixing the gold fine particles on a carrier made of a metal oxide.
  • the metal oxide for dispersing or fixing the gold fine particles is at least one base metal oxide selected from the group consisting of zirconium oxide, cerium oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, manganese oxide, and zinc oxide. It is preferable.
  • the performance of the gold fine particles as a denitration catalyst is improved. More preferably, at least one of zirconium oxide and cerium oxide is used as the metal oxide for dispersing or fixing the gold fine particles.
  • a denitration catalyst in which gold fine particles (gold nanoparticles) are dispersed and fixed on a metal oxide surface can be produced by a conventionally known method of dispersing and fixing gold nanoparticles on a metal oxide surface.
  • the method for dispersing and fixing the gold nanoparticles on the metal oxide surface include a precipitation method, a coprecipitation method, a precipitation reduction method, a gas phase grafting method, and a solid phase mixing method.
  • a method of dispersing and fixing gold nanoparticles on the surface of the metal oxide by a precipitation method will be described.
  • metal oxide particle powder is suspended in an aqueous solution of a gold compound.
  • an alkali is added to the suspension to adjust the pH to a range of 7 to 10
  • gold hydroxide is precipitated and precipitated on the base metal oxide surface.
  • the suspension is stirred for 1 hour or longer (usually about 1 hour) while adjusting the concentration, pH and temperature of the gold compound and reducing agent, etc. Disperse and fix to.
  • the gold hydroxide dispersed and immobilized on the surface of the metal oxide is washed with water, dried, and then calcined at 300 ° C. or higher in the presence of air to obtain a denitration catalyst.
  • the metal oxide is appropriately selected according to the denitration performance required for the denitration catalyst.
  • Examples of the gold compound used for dispersing and fixing gold fine particles (gold nanoparticles) on the surface of the metal oxide by the precipitation method include tetrachloroauric acid (HAuCl 4 ), tetrachloroaurate (for example, NaAuCl 4 ), gold cyanide (AuCN), potassium gold cyanide (K [Au (CN) 2 ]), diethylamine trichloride gold acid ((C 2 H 5 ) 2 NH ⁇ AuCl 3 ), ethylenediamine gold complex (for example, Chloride complexes (Au [C 2 H 4 (NH 2 ) 2 ] 2 Cl 3 )) and dimethylgold ⁇ -diketone derivative complexes (eg dimethylgold acetylacetonate ((CH 3 ) 2 Au [CH 3 COCHCOCH 3 ])) Or a gold salt or a gold complex.
  • HuCl 4 tetrachloroauric acid
  • AuCN gold cyanide
  • the concentration of the gold compound aqueous solution is preferably from 0.1 to 10 mmol / L, more preferably from 0.5 to 2 mmol / L. If the concentration of the aqueous solution of the gold compound is less than 0.1 mmol / L, gold tends to be difficult to precipitate as a hydroxide on the metal oxide, and if it exceeds 10 mmol / L, the gold hydroxide precipitates in the solution. Tend to occur.
  • the concentration of the gold compound dispersed / fixed in the metal oxide is adjusted to 0.01 to 50% by mass (the amount of gold fine particles relative to the mass of the metal oxide) by adjusting the concentration of the gold compound in the aqueous solution. Mass).
  • alkali metal hydroxide, carbonate, alkaline earth metal hydroxide or carbonate, ammonia, urea, or the like can be used.
  • the temperature of the suspension is preferably 0 to 90 ° C., and more preferably 30 to 70 ° C.
  • the average particle diameter of the gold fine particles in the metal oxide prepared by dispersing and fixing gold fine particles on the surface is usually 1 to 50 nm.
  • the average particle diameter of the gold fine particles is adjusted to the above range according to the required denitration performance.
  • a denitration catalyst having a narrow particle distribution of gold fine particles (gold nanoparticles), that is, having a uniform particle diameter can be produced.
  • the denitration catalyst can improve the denitration performance by dispersing and fixing gold fine particles having a narrow particle size distribution on the surface of the metal oxide.
  • the denitration device 90 is disposed on the downstream side of the desulfurization device 70 in the exhaust path L1 through which the exhaust gas generated in the boiler 10 flows. Furthermore, in the above embodiment, the denitration catalyst having gold fine particles is used in the denitration apparatus 90. Thereby, since the distance between the boiler 10 where the fuel burns and the denitration device 90 are sufficiently separated, the temperature of the exhaust gas sent to the denitration device 90 is lower than the exhaust gas sent to the denitration device in the conventional thermal power generation system. It becomes a temperature (for example, 130 to 250 ° C.).
  • the concentrations of coal ash and S in the exhaust gas sent to the denitration device 90 are also sufficient. Can be suppressed.
  • the denitration catalyst having gold fine particles can exhibit a high denitration effect. Therefore, in the thermal power generation system 1 according to the above-described embodiment, it is possible to suppress the deterioration of the denitration catalyst due to exposure to high temperature, coal ash, and S content without reducing the denitration efficiency. By suppressing the deterioration of the denitration catalyst, the replacement frequency of the denitration catalyst can also be suppressed, so that the thermal power generation system 1 has a low operating cost.
  • the gas heater 80 for heating the exhaust gas is disposed between the desulfurization device 70 and the denitration device 90. Therefore, even when the temperature of the exhaust gas discharged from the desulfurization apparatus 70 becomes too low, the exhaust gas can be appropriately heated by the gas heater 80 to adjust the temperature of the exhaust gas to a temperature suitable for the denitration action of the denitration catalyst. Further, by heating the exhaust gas by the gas heater 80, the exhaust gas can be effectively discharged from the upper part of the chimney 100 by the chimney effect.
  • the denitration catalyst used in the denitration apparatus 90 is preferably a catalyst in which gold fine particles are dispersed or fixed on a carrier made of a metal oxide. Thereby, the denitration performance of the denitration apparatus 90 is improved.
  • the carrier for dispersing or fixing the gold fine particles is at least one selected from the group consisting of zirconium oxide, cerium oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, manganese oxide, and zinc oxide.
  • the base metal oxide is preferably used. Thereby, the denitration performance of the denitration apparatus 90 is further improved.
  • the gold fine particles of the denitration catalyst are preferably gold nanoparticles or gold clusters having an average particle diameter of 50 nm or less. Thereby, the denitration performance of the denitration apparatus 90 is improved.
  • the denitration apparatus 90 removes nitrogen oxides from the exhaust gas by the selective catalytic reduction method.
  • ammonia (or urea) used as a reducing agent leaks from the denitration apparatus 90 as the denitration catalyst deteriorates.
  • the denitration device 90 since the denitration device 90 is not disposed upstream of the air preheater 30 that is normally disposed in the vicinity of the boiler 10 in the exhaust passage L1, ammonia and the S component in the exhaust gas react with each other. The air preheater 30 is not clogged due to the generated ammonium sulfate.
  • the sulfur content is sufficiently removed from the exhaust gas by the desulfurization device 70, so that ammonium sulfate is hardly generated even when ammonia leaks from the denitration device 90.
  • the fuel to be burned in the boiler 10 is coal.
  • the concentration of sulfur oxides and nitrogen oxides in the exhaust gas tends to increase, so that the denitration catalyst tends to deteriorate.
  • the thermal power generation system 1 according to the above-described embodiment even when coal is burned in the boiler 10, the deterioration of the denitration catalyst in the denitration apparatus 90 can be suppressed.
  • the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
  • the NOx removal apparatus 90 removes nitrogen oxides from exhaust gas by the selective catalytic reduction method, but the present invention is not limited to this.
  • the denitration apparatus 90 may be configured to remove nitrogen oxides from exhaust gas by a non-selective catalytic reduction method.
  • each denitration catalyst used in Examples and Comparative Examples was prepared as follows.
  • Example 1 0.1M sodium hydroxide was added to a suspension obtained by adding cerium oxide to a 1.0 mM chloroauric acid aqueous solution until the pH reached 7.0. The suspension whose pH was adjusted to 7.0 was stirred for 1 hour, repeatedly washed with pure water, and then filtered to obtain a residue. The obtained filtrate was dried at 120 ° C. overnight and calcined at 300 ° C. for 4 hours in the presence of air. The solid obtained after calcination (catalyst having gold nanoparticles fixed to cerium oxide) was used as the denitration catalyst of Example 1. In the denitration catalyst of Example 1, the average particle diameter of the gold nanoparticles was 50 nm or less. [Comparative Example 1] The cerium oxide used in the preparation of the desulfurization catalyst of Example 1 was used as the denitration catalyst of Comparative Example 1.
  • Example 2 To a suspension obtained by adding zirconium oxide to a 1.0 mM chloroauric acid aqueous solution, 0.1 M sodium hydroxide was added until the pH reached 7.0. The suspension whose pH was adjusted to 7.0 was stirred for 1 hour, repeatedly washed with pure water, and then filtered to obtain a residue. The obtained filtrate was dried at 120 ° C. overnight and calcined at 300 ° C. for 4 hours in the presence of air. The solid (catalyst in which gold nanoparticles were fixed to zirconium oxide) obtained after calcination was used as the denitration catalyst of Example 2. In the denitration catalyst of Example 2, the average particle size of the gold nanoparticles was 50 nm or less. [Comparative Example 2] The zirconium oxide used in the preparation of the desulfurization catalyst of Example 1 was used as the denitration catalyst of Comparative Example 2.
  • FIG. 1 A graph showing the relationship between the reaction temperature and the denitration efficiency for the denitration catalysts of Example 1 and Comparative Example 1 is shown in FIG. Moreover, the graph which showed the relationship between reaction temperature and the denitration efficiency about the denitration catalyst of Example 2 and Comparative Example 2 was shown in FIG. Note that conventionally used vanadium / titanium catalyst (V 2 O 5 / TiO 2 ), the measuring method described above (reaction temperature: 370 ° C.) denitration efficiency measured by is 79.1%. 2 and 3, the denitration efficiency of 79.1% is indicated by a two-dot chain line.
  • V 2 O 5 / TiO 2 vanadium / titanium catalyst
  • FIG. 4 is a graph showing the results of measuring the denitration efficiency of various metal oxides and denitration catalysts in which gold nanoparticles are supported on various metal oxides under a reaction temperature of 200 ° C.
  • the denitration catalyst in which gold nanoparticles are supported on various metal oxides can be prepared by the same method as the denitration catalyst of Example 1 and Example 2 above. The denitration efficiency was measured by the above method.
  • the denitration catalyst of Example 1 has higher denitration efficiency in the low temperature region than the denitration catalyst of Comparative Example 1.
  • the denitration efficiency of the denitration catalyst of Example 1 under the condition of 130 to 250 ° C. is equal to or greater than the denitration efficiency of the vanadium / titanium catalyst used conventionally under the condition of 370 ° C. (temperature near the boiler outlet). It turns out that. From these results, it was revealed that a catalyst in which gold nanoparticles were fixed to cerium oxide was a particularly excellent denitration catalyst in a low temperature region. Therefore, when the denitration catalyst of Example 1 is used for the denitration apparatus 90 of the thermal power generation system 1 according to the above embodiment, it is recognized that nitrogen oxides can be removed from exhaust gas with high efficiency.
  • the denitration catalyst of Example 1 tends to decrease the denitration efficiency when moisture is added to the reaction gas when measuring the denitration efficiency. Specifically, when 2.3 vol% of water is added to the reaction gas, the denitration efficiency at 200 ° C. is 82% (in the case of a reaction gas not containing water, 96%), and the denitration efficiency at 150 ° C. is 47%. (82% in the case of a reactive gas not containing moisture). This result is thought to be due to the fact that moisture adsorbs on the catalyst inhibits adsorption of nitric oxide and ammonia to the active site of the catalyst.
  • Example 2 and Comparative Example 2 shown in FIG. 3 From the results of Example 2 and Comparative Example 2 shown in FIG. 3, it was found that the denitration catalyst of Example 2 has higher denitration efficiency in the low temperature region than the denitration catalyst of Comparative Example 2.
  • the denitration efficiency of the denitration catalyst of Example 1 under the condition of 130 to 300 ° C. is equal to or higher than the denitration efficiency of the vanadium / titanium catalyst used conventionally at 370 ° C. From these results, it has been clarified that a catalyst in which gold nanoparticles are fixed to zirconium oxide is also a particularly excellent denitration catalyst in a low temperature region. Therefore, even when the denitration catalyst of Example 2 is used for the denitration apparatus 90 of the thermal power generation system 1 according to the above embodiment, it is recognized that nitrogen oxides can be removed from exhaust gas with high efficiency.
  • the denitration catalyst in which gold nanoparticles are supported on the metal oxide has lower denitration efficiency at a low temperature (200 ° C.) than the metal oxide. I found it expensive. From these results, it was confirmed that the metal oxide improves the denitration efficiency at a low temperature by supporting the gold nanoparticles.

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Abstract

L'invention concerne un système de génération d'énergie thermique qui a de faibles coûts de fonctionnement, étant donné que la dégradation d'un catalyseur de dénitration utilisé dans un dispositif de dénitration est supprimée. L'invention concerne un système de génération d'énergie thermique (1) qui comprend une chaudière (10) qui brûle un combustible, un trajet d'échappement (L1) à travers lequel un gaz d'échappement généré par la combustion du combustible dans la chaudière (10) s'écoule, un dispositif de désulfuration (70) qui est disposé dans le trajet d'échappement (L1) et élimine des oxydes de soufre du gaz d'échappement, et un dispositif de dénitration (90) qui est disposé dans le trajet d'échappement (L1) et élimine des oxydes d'azote du gaz d'échappement au moyen d'un catalyseur de dénitration, le dispositif de dénitration (90) étant disposé en aval du dispositif de désulfuration (70) dans le trajet d'échappement (L1) et le catalyseur de dénitration comportant des particules fines d'or.
PCT/JP2015/075515 2015-09-08 2015-09-08 Système de génération d'énergie thermique WO2017042895A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018047377A1 (fr) * 2016-09-12 2018-03-15 中国電力株式会社 Système de combustion
WO2020179075A1 (fr) * 2019-03-07 2020-09-10 中国電力株式会社 Système de combustion
JPWO2020179892A1 (fr) * 2019-03-07 2020-09-10
JPWO2020179079A1 (fr) * 2019-03-07 2020-09-10
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