WO2017141705A1 - 排ガス脱硝装置および排ガス脱硝装置の制御方法 - Google Patents

排ガス脱硝装置および排ガス脱硝装置の制御方法 Download PDF

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WO2017141705A1
WO2017141705A1 PCT/JP2017/003570 JP2017003570W WO2017141705A1 WO 2017141705 A1 WO2017141705 A1 WO 2017141705A1 JP 2017003570 W JP2017003570 W JP 2017003570W WO 2017141705 A1 WO2017141705 A1 WO 2017141705A1
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WIPO (PCT)
Prior art keywords
exhaust gas
boiler
temperature
denitration
engine
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PCT/JP2017/003570
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English (en)
French (fr)
Japanese (ja)
Inventor
中川　貴裕
平岡　直大
勝也 藤田
聡志 土屋
Original Assignee
三菱重工業株式会社
株式会社赤阪鐵工所
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Application filed by 三菱重工業株式会社, 株式会社赤阪鐵工所 filed Critical 三菱重工業株式会社
Priority to KR1020187022979A priority Critical patent/KR102111227B1/ko
Priority to CN201780011241.8A priority patent/CN108884736B/zh
Publication of WO2017141705A1 publication Critical patent/WO2017141705A1/ja

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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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present disclosure relates to an exhaust gas denitration apparatus and a control method for the exhaust gas denitration apparatus.
  • a marine two-stroke diesel engine used as a main engine of a marine vessel is also required to reduce nitrogen oxides (NOx) contained in exhausted engine exhaust gas.
  • NOx nitrogen oxides
  • a reducing agent is injected into engine exhaust gas, and nitrogen oxide (NOx) is converted into nitrogen (N 2 ) and water (H 2 O) by the action of the SCR catalyst.
  • SCR method selective catalytic reduction method
  • the SCR catalyst that is generally distributed is premised on continuous use and use at an active temperature (for example, 300 ° C. or higher), but the temperature of engine exhaust gas discharged from the above-described marine 2-stroke diesel engine is low. Efficient denitration performance may not be demonstrated.
  • the flow rate of the engine exhaust gas discharged from the marine two-stroke diesel engine itself is small, so that the temperature of the engine exhaust gas is remarkably reduced due to heat radiation from the exhaust pipe.
  • the supercharger is driven by engine exhaust gas, and therefore the temperature of the engine exhaust gas discharged from the supercharger is more significantly reduced.
  • the marine exhaust gas denitration apparatus of Patent Document 1 is equipped with an auxiliary burner for heating the engine exhaust gas discharged from the engine.
  • an auxiliary burner for heating the engine exhaust gas discharged from the engine.
  • the low temperature denitration apparatus of Patent Document 2 can supply engine exhaust gas discharged from a power generation diesel engine provided separately from the diesel main engine to the denitration catalyst.
  • the high temperature engine exhaust gas discharged from the power generation diesel engine is supplied to the denitration catalyst, so that the denitration catalyst which is poisoned by the production of acidic ammonium sulfate and has reduced performance can be regenerated.
  • the low-temperature denitration apparatus of Patent Document 2 introduces engine exhaust gas discharged from a power generation diesel engine provided separately from the diesel main engine into an exhaust passage. Therefore, there is a problem that it is difficult to stably supply engine exhaust gas at a temperature necessary for regeneration of the denitration catalyst because the flow rate and temperature of the engine exhaust gas discharged in response to the change. Further, as shown in FIG. 1 of Patent Document 2, when there are a plurality of power generating diesel engines, a plurality of pipes for connecting the power generating diesel engines and the denitration catalyst are required, and the apparatus configuration is complicated. There was a problem of becoming.
  • At least one embodiment of the present invention is an invention made in view of the above-described problems of the prior art, and its object is to stably supply high-temperature exhaust gas to a denitration catalyst with a simple apparatus configuration. It is an object to provide an exhaust gas denitration apparatus and a control method for the exhaust gas denitration apparatus.
  • An exhaust gas denitration apparatus includes: An exhaust passage through which engine exhaust gas discharged from the main engine of the ship flows, A reducing agent storage tank for storing the reducing agent; A reducing agent injection nozzle for injecting the reducing agent stored in the reducing agent storage tank into the engine exhaust gas flowing through the exhaust passage; A denitration reactor which is provided on the exhaust flow path and reduces nitrogen oxides contained in the engine exhaust gas; A boiler exhaust gas channel that guides the boiler exhaust gas discharged from the boiler mounted on the ship to the upstream side of the denitration reactor in the exhaust channel; A boiler exhaust gas control valve for controlling the flow of boiler exhaust gas in the boiler exhaust gas conduit; A blower that blows the boiler exhaust gas flowing through the boiler exhaust gas guide passage downstream; Is provided.
  • the boiler exhaust gas deriving apparatus in which the exhaust gas denitration apparatus guides the boiler exhaust gas discharged from the boiler mounted on the ship to the upstream side of the denitration reactor in the exhaust passage.
  • a boiler exhaust gas control valve that controls the flow of the boiler exhaust gas in the boiler exhaust gas conduit, and a blower that blows the boiler exhaust gas flowing in the boiler exhaust gas conduit downstream. Therefore, when the engine exhaust gas discharged from the main engine is at a low temperature, such as when the main engine starts up or during low-load operation, the boiler exhaust gas discharged from the boiler is denitrated via the boiler exhaust gas conduit.
  • the denitration catalyst can be heated by introducing it to the vessel.
  • the boiler mounted in a ship supplies the heat source etc. which are required in a ship, for example, and a combustion state is substantially constant and stable compared with the diesel engine for electric power generation. Therefore, according to the embodiment described in (1) above, it is possible to stably supply high-temperature exhaust gas to the denitration catalyst as compared with the low-temperature denitration apparatus described in Patent Document 2.
  • the pressure of the boiler exhaust gas discharged from the boiler is usually lower than the pressure of the engine exhaust gas discharged from the main engine.
  • the pressure of the exhaust passage propagates to the boiler, and the pressure on the downstream side of the boiler exhaust gas flow in the boiler rises. May affect the combustion state.
  • the embodiment described in the above (1) includes a blower that blows the boiler exhaust gas flowing through the boiler exhaust gas conduit to the downstream side. Thereby, it is possible to prevent the pressure in the exhaust passage from propagating to the boiler and affecting the combustion state of the boiler.
  • the boiler exhaust gas control valve is opened based on the engine exhaust gas temperature, the boiler exhaust gas temperature, and the denitration reactor temperature.
  • a control device for controlling the valve or valve closing and ON / OFF of the operation of the blower is further provided.
  • the opening or closing of the boiler exhaust gas control valve, and the operation of the blower ON / OFF can be controlled by the control device.
  • the control device is configured such that the temperature of the denitration reactor is lower than a first specified temperature when the main engine is started or during low load operation. And when the temperature of the engine exhaust gas is lower than the second specified temperature and the temperature of the boiler exhaust gas is higher than the temperature of the engine exhaust gas, the boiler exhaust gas control valve is opened and the operation of the blower is turned on. The exhaust gas from the boiler is configured to be supplied to the denitration reactor.
  • the boiler exhaust gas Is supplied to the denitration reactor, so that the denitration catalyst can be heated by high-temperature boiler exhaust gas.
  • “when the main engine is started” refers to the period from when the main engine in the stopped state is started until a predetermined time elapses or until a predetermined load is reached, and the main engine is reached. This means that the temperature of the engine exhaust gas discharged from the engine does not reach the second specified temperature.
  • “when the main engine is in a low load operation” means a state in which the main engine is continuously operated in a state where the temperature of the engine exhaust gas discharged from the main engine is lower than the second specified temperature.
  • the first specified temperature described above is the activation temperature of the denitration catalyst.
  • the second specified temperature described above is the temperature of the engine exhaust gas required to heat the denitration catalyst to the first specified temperature when the engine exhaust gas discharged from the main engine is supplied to the denitration reactor. The temperature is the same as or higher than the first specified temperature.
  • the control device is configured such that the temperature of the denitration reactor is lower than a third specified temperature during regeneration of the denitration catalyst,
  • the boiler exhaust gas control valve is opened and the fan is operated. Is configured to supply boiler exhaust gas to the denitration reactor.
  • the boiler exhaust gas By supplying to the denitration reactor, the denitration catalyst can be regenerated by heating the denitration catalyst with the high-temperature boiler exhaust gas.
  • “at the time of regeneration of the denitration catalyst” means a state in which measures are taken to recover the performance of the denitration catalyst whose performance has been degraded by poisoning. It means a state in which the denitration catalyst is heated to the third specified temperature or higher in order to remove the attached acidic ammonium sulfate by heating.
  • the denitration catalyst is poisoned, for example, when the differential pressure across the denitration reactor is greater than or equal to a predetermined value. Further, for example, when the NOx concentration difference before and after the denitration reactor becomes less than a predetermined value, it is determined that the denitration catalyst is poisoned. In addition to this, when the main engine is continuously operating for a predetermined time or more, or when the elapsed time since the previous regeneration has exceeded a predetermined time, the denitration catalyst is being poisoned. The denitration catalyst may be regenerated. Further, for example, the above-mentioned third specified temperature is a temperature necessary to regenerate the denitration catalyst.
  • the above-mentioned fourth specified temperature is the temperature of the engine exhaust gas required to heat the denitration catalyst to the third specified temperature when the engine exhaust gas is supplied to the denitration reactor, and the third specified temperature.
  • the temperature is the same as or higher than that.
  • the flow of the engine exhaust gas is changed by opening and closing each of the exhaust passage side branch valve, the bypass passage side branch valve, the exhaust passage side junction valve, and the bypass passage side junction valve. It is possible to switch between the exhaust channel side and the bypass channel side. Therefore, for example, when a ship passes through a sea area where environmental regulation values are severe, the flow of the engine exhaust gas is switched to the exhaust flow path side, and when the ship is navigating in a general sea area, the flow of the engine exhaust gas is switched to the bypass flow path side. It is also possible to switch the flow of engine exhaust gas in accordance with the environmental regulation value of the marine area to be navigated.
  • a purge gas supply that supplies a purge gas to a section of the exhaust flow channel between the exhaust flow channel side branch valve and the exhaust flow channel side junction valve.
  • the purge gas can be supplied to the section between the exhaust passage side branch valve and the exhaust passage side junction valve in the exhaust passage by the purge gas supply device.
  • the control device is configured to operate the exhaust gas denitration system including a reducing agent storage tank, a reducing agent injection nozzle, and a denitration reactor when the exhaust gas denitration system is not operating.
  • the exhaust passage side branch valve is closed, the bypass passage side branch valve is opened, the exhaust passage side junction valve is closed, and the bypass passage side junction valve is opened.
  • the purge gas supply device is controlled so as to supply the purge gas to a section between the exhaust flow channel side branch valve and the exhaust flow channel side junction valve in the exhaust flow channel.
  • the control device can seal the purge gas in the section between the exhaust passage side branch valve and the exhaust passage side junction valve in the exhaust passage.
  • the engine exhaust gas leaking from the exhaust flow channel side branch valve or the exhaust flow channel side junction valve in the closed state to the exhaust flow channel side comes into contact with the denitration catalyst, thereby 3 ) can be reliably prevented from being generated.
  • the control device includes a reducing agent storage tank, a reducing agent injection nozzle, and a denitration reactor.
  • the exhaust flow channel side branch valve is closed, the bypass flow channel side branch valve is opened, the exhaust flow channel side merge valve is opened, and the bypass flow channel side merge valve is opened.
  • the boiler exhaust gas control valve is opened and the blower is turned on to supply the boiler exhaust gas to the denitration reactor for a predetermined time.
  • the boiler exhaust gas is supplied to the denitration reactor for a predetermined time after the operation of the exhaust gas denitration system is completed. Thereby, the progress of poisoning in the denitration catalyst can be suppressed, and the regeneration interval of the denitration catalyst can be lengthened.
  • the exhaust gas denitration device according to any one of (5) to (8) further includes an exhaust gas economizer disposed on the downstream side of the joining portion in the exhaust flow path. .
  • a method for controlling an exhaust gas denitration apparatus includes: An exhaust passage through which engine exhaust gas discharged from the main engine flows, A reducing agent storage tank for storing the reducing agent; A reducing agent injection nozzle for injecting the reducing agent stored in the reducing agent storage tank into the engine exhaust gas flowing through the exhaust passage; A denitration reactor provided on the exhaust flow path and having a catalyst for reducing nitrogen oxides contained in the engine exhaust gas; A boiler exhaust gas channel that guides the boiler exhaust gas discharged from the boiler mounted on the ship to the upstream side of the denitration reactor in the exhaust channel; A boiler exhaust gas control valve for controlling the flow of boiler exhaust gas in the boiler exhaust gas conduit; A control method of an exhaust gas denitration device comprising: a blower that blows boiler exhaust gas flowing through the boiler exhaust gas guide passage downstream; A step of opening or closing the boiler exhaust gas control valve, and a step of controlling ON / OFF of the operation of the blower.
  • the boiler exhaust gas control valve In the control method of the exhaust gas denitration device for reducing nitrogen oxides contained in the engine exhaust gas discharged from the main engine mounted on the ship, the boiler exhaust gas control valve And a step of controlling ON / OFF of the operation of the blower. Therefore, as necessary, the boiler exhaust gas discharged from the boiler can be supplied to the denitration reactor and the denitration catalyst can be heated.
  • an exhaust gas denitration apparatus and a control method for the exhaust gas denitration apparatus that can stably supply high-temperature exhaust gas to the denitration catalyst with a simple apparatus configuration.
  • FIG. 1 is an overall configuration diagram of an exhaust gas denitration apparatus according to an embodiment of the present invention.
  • 1 is an overall configuration diagram of an exhaust gas denitration apparatus according to an embodiment of the present invention.
  • It is a block diagram of a control device concerning one embodiment of the present invention.
  • It is a block diagram of a control device concerning one embodiment of the present invention.
  • It is a control flow figure of the control device concerning one embodiment of the present invention, and is a figure showing the flow of heating control of the NOx removal catalyst at the time of main engine starting or low load operation.
  • FIG. 3 is a control flow diagram of a control device according to an embodiment of the present invention, and is a diagram illustrating a flow of regeneration control of the denitration catalyst during regeneration of the denitration catalyst.
  • FIG. 5 is a timing chart showing boiler exhaust gas supply timing and exhaust gas denitration system operation timing in the exhaust gas denitration apparatus according to an embodiment of the present invention. It is the figure which showed the state which supplies purge gas to the area between the exhaust flow path side branch valve and the exhaust flow path side confluence valve in an exhaust flow path. It is a timing chart for demonstrating the supply timing of purge gas. It is the figure which showed the state which supplies boiler exhaust gas to a denitration reactor after the action
  • an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
  • expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
  • the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
  • FIG.1 and FIG.2 is a whole block diagram of the exhaust gas denitration apparatus concerning one Embodiment of this invention.
  • An exhaust gas denitration apparatus according to an embodiment of the present invention is an exhaust gas denitration apparatus 10 for reducing nitrogen oxides contained in engine exhaust gas discharged from a main engine 2 mounted on a ship 1.
  • the exhaust gas denitration apparatus 10 (10A, 10B) concerning one Embodiment of this invention is the exhaust flow path 11, the exhaust gas denitration system 20, and the boiler exhaust gas conveyance path 12.
  • the boiler exhaust gas control valve 13 and the blower 14 are provided.
  • the main engine 2 is, for example, a marine 2-stroke diesel engine mounted on the ship 1, and is an engine for imparting a propulsive force for navigating the ship 1.
  • the main engine 2 has a cylinder part (not shown), an exhaust manifold 3, a supercharger 4, an exhaust valve (not shown), and the like.
  • the main engine 2 is configured to discharge engine exhaust gas from the combustion chamber inside the cylinder when the exhaust valve is opened.
  • the discharged engine exhaust gas is once introduced into the exhaust manifold 3 and converted into static pressure, and then introduced into the turbine section 4a of the supercharger 4. And after rotating the turbine rotor blade (not shown) arrange
  • the exhaust passage 11 is a tubular passage through which engine exhaust gas discharged from the main engine 2 flows.
  • One end side of the exhaust passage 11 is connected to the outlet side of the turbine section 4 a of the main engine 2.
  • the other end side of the exhaust passage 11 is connected to a chimney for discharging engine exhaust gas to the outside.
  • the exhaust gas denitration system 20 is a denitration system for reducing nitrogen oxides (NOx) contained in the engine exhaust gas discharged from the main engine.
  • the exhaust gas denitration system 20 of the present embodiment is, for example, a selective catalytic reduction (SCR) system.
  • SCR selective catalytic reduction
  • the exhaust gas denitration system 20 includes a reducing agent storage tank 22 that stores a reducing agent, and a reducing agent storage tank 22.
  • a reducing agent injection nozzle 24 for injecting the stored reducing agent into the engine exhaust gas flowing through the exhaust passage 11 and a denitration catalyst 26a provided on the exhaust passage 11 for reducing nitrogen oxides contained in the engine exhaust gas are provided.
  • the denitration reactor 26 which has is included.
  • the reducing agent storage tank 22 stores, for example, urea water as a reducing agent.
  • the reducing agent pump 23 a is driven, the reducing agent stored in the reducing agent storage tank 22 is injected with the reducing agent via the reducing agent passage 23 connecting the reducing agent storage tank 22 and the reducing agent injection nozzle 24. It is supplied to the nozzle 24. Then, the reducing agent is injected from the reducing agent injection nozzle 24 toward the inside of the exhaust passage 11.
  • the denitration reactor 26 is disposed on the downstream side of the reducing agent injection nozzle 24 in the exhaust passage 11.
  • the denitration reactor 26 is a cylindrical member configured so that engine exhaust gas passes through the inside thereof, and each of the inlet side and the outlet side thereof is connected to an exhaust pipe forming the exhaust passage 11. In other words, the denitration reactor 26 forms a part of the exhaust passage 11 inside thereof.
  • the boiler 8 is, for example, an auxiliary boiler mounted on the ship 1, and heat energy such as steam used for operation of auxiliary equipment other than the main engine drive in the ship 1, inboard air conditioning equipment, kitchen, and other miscellaneous purposes is put into the ship. It is for supply.
  • one boiler 8 is mounted on the ship 1.
  • Such a boiler 8 is mounted on most ships having a scale of a predetermined level or more.
  • the boiler exhaust gas channel 12 is a tubular channel for guiding the boiler exhaust gas discharged from the boiler 8 mounted on the ship 1 to the upstream side of the denitration reactor 26 in the exhaust channel 11. .
  • the connection portion 12 a between the exhaust flow path 11 and the boiler exhaust gas flow path 12 is located upstream of the denitration reactor 26 and downstream of the reducing agent injection nozzle 24.
  • the connection portion 12 a between the exhaust passage 11 and the boiler exhaust gas passage 12 is located upstream of the denitration reactor 26 and upstream of the reducing agent injection nozzle 24. is doing.
  • the reducing agent can be directly injected into exhaust gas in which engine exhaust gas and boiler exhaust gas are mixed (hereinafter sometimes referred to as “engine / boiler mixed exhaust gas”).
  • engine / boiler mixed exhaust gas exhaust gas in which engine exhaust gas and boiler exhaust gas are mixed
  • nitrogen oxide contained in the boiler exhaust gas can be efficiently reduced by the denitration catalyst 26a.
  • the boiler exhaust gas control valve 13 is a valve for controlling the flow of boiler exhaust gas in the boiler exhaust gas conduit.
  • Examples of the type of the boiler exhaust gas control valve 13 include a control valve that controls the flow rate of boiler exhaust gas that passes by adjusting the valve opening, and a valve body that is opened (for example, fully open) or closed (for example, fully closed).
  • an on-off valve that controls the flow rate of the boiler exhaust gas to be 0% (not to pass) or 100% (to pass the entire amount).
  • two boiler exhaust gas control valves 13A and 13B are arranged in the boiler exhaust gas conduit 12.
  • the boiler exhaust gas control valve 13 ⁇ / b> A is disposed on the downstream side of the connecting portion 12 a between the exhaust flow path 11 and the boiler exhaust gas conduit and on the upstream side of the blower 14 described later, and the boiler flowing in the boiler exhaust gas conduit 12. The flow of exhaust gas is controlled.
  • the boiler exhaust gas control valve 13 ⁇ / b> B is disposed on the downstream side of the boiler exhaust gas flow of the boiler 8, and is disposed at a branching portion 12 b between the boiler exhaust gas conduit 12 and the boiler exhaust gas discharge path 19, and the boiler discharged from the boiler 8.
  • the flow of the exhaust gas is switched to the boiler exhaust gas conduit 12 side (opening side) and the boiler exhaust gas discharge path 19 side (valve closing side).
  • the number of boiler exhaust control valves 13 is not particularly limited.
  • the blower 14 is a device for blowing the boiler exhaust gas flowing through the boiler exhaust gas conduit 12 downstream, and includes, for example, an induction fan.
  • the blower 14 sucks the boiler exhaust gas flowing upstream of the boiler exhaust gas conduit 12 and discharges it to the downstream, thereby resisting the pressure of the engine exhaust gas flowing through the exhaust passage 11, against the boiler exhaust gas conduit 12.
  • the exhaust gas flowing through the boiler flows out into the exhaust passage 11.
  • the blower 14 is disposed between the two boiler exhaust gas control valves 13A and 13B described above.
  • the main engine 2 is disposed on the bottom surface of the engine room, and the reducing agent injection nozzle 24 and the denitration reactor 26 are disposed on the floor surface of a 3rd deck that is one step higher than the bottom surface of the engine room. ing.
  • the boiler 8 is arrange
  • the exhaust passage 11 extends from the bottom surface of the engine room where the main engine 2 is disposed toward the floor surface of the upper deck which is one step higher than the floor surface of the 2nd deck where the boiler 8 is disposed. Is connected to the chimney for discharging to the outside.
  • the distance between the reducing agent injection nozzle 24 and the denitration reactor 26 is ensured to be sufficient for the injected reducing agent to be sufficiently mixed with the engine exhaust gas.
  • the exhaust gas denitration apparatus 10 guides the boiler exhaust gas discharged from the boiler 8 mounted on the ship 1 to the upstream side of the denitration reactor 26 in the exhaust passage 11.
  • a flow path 12 boiler exhaust gas control valves 13 ⁇ / b> A and 13 ⁇ / b> B that control the flow of boiler exhaust gas in the boiler exhaust gas conduit 12, and a blower 14 that blows the boiler exhaust gas flowing through the boiler exhaust gas conduit 12 downstream.
  • the boiler exhaust gas discharged from the boiler 8 is passed through the boiler exhaust gas conduit 12 in an operation state where the temperature of the engine exhaust gas discharged from the main engine 2 is low, such as when the main engine 2 is started or during low load operation.
  • the denitration reactor 26 can be conducted to heat the denitration catalyst 26a.
  • the boiler 8 mounted on the ship 1 has a substantially constant combustion state and is stable as compared with the diesel engine for power generation. Therefore, according to such embodiment, compared with the low-temperature denitration apparatus described in Patent Document 2 described above, high-temperature exhaust gas can be stably supplied to the denitration catalyst 26a.
  • the pressure of the boiler exhaust gas discharged from the boiler 8 is usually lower than the pressure of the engine exhaust gas discharged from the main engine 2.
  • the pressure of the exhaust passage 11 propagates to the boiler 8, and the boiler exhaust gas flow downstream of the boiler 8. May increase and affect the combustion state of the boiler 8.
  • the above-described embodiment includes the blower 14 that blows the boiler exhaust gas flowing through the boiler exhaust gas conduit 12 downstream. Thereby, it is possible to suppress the pressure of the exhaust passage 11 from propagating to the boiler 8 and affecting the combustion state of the boiler 8.
  • the exhaust gas denitration device 10 ⁇ / b> B branches from the upstream side of the position where the reducing agent is injected from the reducing agent injection nozzle 24 in the exhaust passage 11, and the exhaust passage 11 A bypass flow path 15 that merges on the downstream side of the denitration reactor 26, and an exhaust flow path side branch valve 16A provided on the exhaust flow path 11 side in the branch portion 16 where the bypass flow path 15 branches from the exhaust flow path 11, Exhaust flow channel side junction valve provided on the exhaust flow channel 11 side in the merge portion 17 where the bypass flow channel side branch valve 16B provided on the bypass flow channel 15 side in the branch portion 16 and the exhaust flow channel 11 and the bypass flow channel 15 merge.
  • valve 17A and a bypass flow path side confluence valve 17B provided on the bypass flow path 15 side in the merge section 17 are further provided.
  • the valve symbols indicating the exhaust passage side branch valve 16A, the bypass passage side branch valve 16B, the exhaust passage side merging valve 17A, and the bypass passage side merging valve 17B are white. Paint indicates a valve open state, and black paint indicates a valve closed state.
  • the exhaust passage side branch valve 16A, the bypass passage side branch valve 16B, the exhaust passage side merging valve 17A, and the bypass passage side merging valve 17B are opened and closed, respectively, so that 11 exhausts from the main engine.
  • the engine exhaust gas flow can be switched between the exhaust flow path 11 side and the bypass flow path 15 side. Therefore, for example, when the ship 1 passes through a sea area where environmental regulation values are severe, the flow of the engine exhaust gas is switched to the exhaust flow path 11 side, and when the ship 1 is navigating a general sea area, the flow of the engine exhaust gas is bypassed. It is also possible to switch the flow of engine exhaust gas according to the environmental regulation value of the marine area to navigate, such as switching to the 15 side.
  • a purge gas supply device 18 is further provided for supplying purge gas to a section of the exhaust flow channel 11 between the exhaust flow channel side branch valve 16A and the exhaust flow channel side junction valve 17A. .
  • the purge gas supply device 18 includes a purge gas generator 18A that generates a purge gas, and a section between the exhaust flow channel side branch valve 16A and the exhaust flow channel side confluence valve 17A in the exhaust flow channel 11 for the generated purge gas. And a purge gas supply valve 18C disposed on the side of the purge gas introduction channel 18B at the connection portion between the exhaust channel 11 and the purge gas introduction channel 18B.
  • the purge gas in addition to an inert gas such as nitrogen (N 2 ), a gas having a NOx concentration and a SOx concentration that are not more than a predetermined concentration and a moisture amount that is not more than a predetermined amount can be used.
  • the purge gas generator is disposed on the floor surface of the 2nd deck having the same height as the boiler 8 is disposed.
  • the purge gas supply device 18 can supply the purge gas to the section of the exhaust passage 11 between the exhaust passage side branch valve 16A and the exhaust passage side junction valve 17A. Therefore, as described later, for example, when the exhaust gas denitration system 20 is not operating, the purge gas is supplied to the section between the exhaust flow channel side branch valve 16A and the exhaust flow channel side junction valve 17A in the exhaust flow channel 11 to close the exhaust gas denitration system 20. It is ensured that nitric acid (HNO 3 ) is generated by contact of the engine exhaust gas leaked from the exhaust passage side branch valve 16A and the exhaust passage side junction valve 17A in the valve state to the exhaust passage 11 side with the NOx removal catalyst 26a. Can be prevented.
  • HNO 3 nitric acid
  • the exhaust gas economizer 60 is further provided on the downstream side of the merging portion 17 in the exhaust flow path 11.
  • the exhaust gas economizer 60 is a device for recovering heat energy of the engine exhaust gas flowing through the exhaust passage 11 and exchanging heat with a heated medium such as water.
  • the exhaust gas economizer 60 is disposed on the floor surface of a 2nd deck having the same height as the boiler 8. The boiler water heated by the exhaust gas economizer 60 is supplied to the boiler 8.
  • the exhaust gas economizer 60 disposed on the downstream side of the merging portion 17 in the exhaust flow channel 11 causes the engine exhaust gas discharged from the main engine 2 to flow out of the exhaust flow channel 11 or the bypass flow channel 15. Even if it passes, the heat recovery from the engine exhaust gas can be performed. That is, heat recovery can be performed from both the engine exhaust gas flowing through the exhaust passage 11 and the engine exhaust gas flowing through the bypass passage 15 by one exhaust gas economizer 60.
  • FIG. 5 is a control flow diagram of the control device according to the embodiment of the present invention, and is a diagram showing a control flow at the time of starting the main engine or at a low load operation.
  • FIG. 6 is a control flow diagram of the control device according to the embodiment of the present invention, and is a diagram showing a control flow at the time of starting the main engine or at a low load operation.
  • the control device 40 is configured as a microcomputer including, for example, a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and an I / O interface. .
  • CPU central processing unit
  • RAM random access memory
  • ROM read only memory
  • I / O interface I/ O interface
  • the exhaust gas denitration apparatus 10 includes an engine exhaust gas pressure sensor 31, a boiler exhaust gas pressure sensor 32, an engine exhaust gas temperature sensor 33, and a boiler exhaust gas temperature sensor 34.
  • Various sensors such as a denitration reactor temperature sensor 35 are attached.
  • the engine exhaust gas pressure sensor 31 is a sensor that measures the pressure of the engine exhaust gas discharged from the main engine 2.
  • the engine exhaust gas pressure sensor 31 is connected to the upstream side of the denitration reactor 26 in the exhaust passage 11 and to the connection portion 12 a between the exhaust passage 11 and the bypass passage 15 or to the denitration reactor 26. It arrange
  • the boiler exhaust gas pressure sensor 32 is a sensor that measures the pressure of the boiler exhaust gas discharged from the boiler 8.
  • the boiler exhaust gas pressure sensor 32 is disposed on the downstream side of the boiler 8 and on the upstream side of the branch portion 12 b between the boiler exhaust gas conduit 12 and the boiler exhaust gas discharge passage 19.
  • the engine exhaust gas temperature sensor 33 is a sensor that measures the temperature of the engine exhaust gas discharged from the main engine 2.
  • the engine exhaust gas temperature sensor 33 is located upstream from the position where the reducing agent is injected from the reducing agent injection nozzle 24, and in the exhaust gas denitration apparatus 10 shown in FIG.
  • the bypass channel 15 is arranged on the upstream side of the branching portion 16 where the bypass channel 15 branches.
  • the boiler exhaust gas temperature sensor 34 is a sensor that measures the temperature of the boiler exhaust gas discharged from the boiler 8. In the illustrated embodiment, the boiler exhaust gas temperature sensor 34 is disposed on the downstream side of the branch portion 12 b of the boiler exhaust gas conduit 12 and on the upstream side of the blower 14.
  • the denitration reactor temperature sensor 35 is a sensor that measures the temperature of the denitration reactor 26. In the illustrated embodiment, the ambient temperature at the inlet of the denitration reactor 26 is measured at the inlet of the denitration reactor 26.
  • the data measured by these various sensors is transmitted to the control device 40 via wired or wireless communication means.
  • the temperature of the engine exhaust gas discharged from the main engine 2 from the boiler 8
  • a control device 40 for controlling the opening or closing of the boiler exhaust gas control valve 13 and the ON / OFF of the operation of the blower 14 based on the temperature of the discharged boiler exhaust gas and the temperature of the denitration reactor 26 is further provided.
  • FIG. 3 is a block diagram of the control device 40 showing a configuration particularly when the main engine 2 is activated or operated at a low load.
  • the control device 40 includes an operation unit 41, a heating execution determination unit 42, a heating necessity determination unit 44, a boiler exhaust gas / engine exhaust gas comparison unit 46, a boiler exhaust gas temperature comparison unit 47, a boiler exhaust gas regulation.
  • a temperature setting unit 48, an engine exhaust gas specified temperature setting unit 49, an engine exhaust gas temperature comparison unit 50, and a denitration reactor specified temperature setting unit 51 are included.
  • “when the main engine is started” refers to the period from when the main engine 2 in the stopped state is started until a predetermined time elapses or until a predetermined load is reached.
  • the temperature of the engine exhaust gas discharged from the engine 2 (in this embodiment, the temperature of the engine exhaust gas measured by the engine exhaust gas temperature sensor 33 described above) does not reach a second specified temperature described later.
  • “when the main engine is in a low load operation” means a state in which the main engine 2 is continuously operated in a state where the temperature of the engine exhaust gas discharged from the main engine 2 is lower than the second specified temperature. .
  • the heating necessity determination unit 44 is preset by the temperature of the denitration reactor 26 input from the denitration reactor temperature sensor 35 (atmosphere temperature at the inlet of the denitration reactor 26) and the denitration reactor specified temperature setting unit 51. And a determination unit that determines whether or not it is necessary to heat the denitration catalyst 26a. For example, when the temperature of the denitration reactor 26 is lower than the first specified temperature that is the activation temperature of the denitration catalyst 26a, it is determined that the denitration catalyst 26a needs to be heated. When the temperature of the denitration reactor 26 is equal to or higher than the first specified temperature, it is determined that heating of the denitration catalyst 26a is unnecessary. And it is comprised so that the determination result may be output to the heating execution determination part 42 mentioned later.
  • the heating execution determination unit 42 determines whether to actually perform heating of the denitration catalyst 26a when the above-described heating necessity determination unit 44 determines that heating of the denitration catalyst 26a is necessary. Part. Based on the output from the boiler exhaust gas temperature comparison unit 47 and the output from the engine exhaust gas temperature comparison unit 50, the heating execution determination unit 42 determines whether to perform heating of the denitration catalyst 26a by the boiler exhaust gas.
  • the temperature of the engine exhaust gas discharged from the main engine 2 is often lower than the second specified temperature.
  • the temperature of the engine exhaust gas may be higher than the second specified temperature. possible.
  • the NOx removal catalyst 26a can be heated to the first specified temperature by the engine exhaust gas discharged from the main engine 2, it is determined that heating by the boiler exhaust gas is not executed.
  • the temperature of the boiler exhaust gas discharged from the boiler 8 is lower than the temperature of the engine exhaust gas discharged from the main engine 2, the heating with the boiler exhaust gas is performed because the boiler exhaust gas cannot be heated. Judge that it is not.
  • the temperature of the boiler exhaust gas discharged from the boiler 8 may be lower than the temperature required to heat the denitration catalyst 26a to the first specified temperature when the boiler exhaust gas is supplied to the denitration reactor 26.
  • the second specified temperature is necessary for heating the denitration catalyst 26a to the first specified temperature which is the activation temperature when the engine exhaust gas discharged from the main engine 2 is supplied to the denitration reactor 26.
  • the second specified temperature is set as a temperature equal to or higher than the first specified temperature.
  • the second specified temperature is set as a temperature higher than the first specified temperature in anticipation of a temperature drop due to this heat dissipation.
  • the second specified temperature is set to the same temperature as the first specified temperature.
  • the operation unit 41 is a control unit for controlling the opening degree of the boiler exhaust gas control valve 13 and controlling the ON / OFF of the blower 14 and its rotational speed.
  • the operation unit 41 opens or closes the boiler exhaust gas control valve 13 and controls ON / OFF of the operation of the blower 14 based on the determination result of necessity of heating execution output from the heating execution determination unit 42. .
  • the heating execution is “necessary”
  • the boiler exhaust gas control valve 13 is opened and the operation of the blower 14 is turned ON.
  • the boiler exhaust gas control valve 13 is closed and the operation of the blower 14 is turned off.
  • the operation unit 41 compares the pressure of the engine exhaust gas discharged from the main engine 2 and the pressure of the boiler exhaust gas discharged from the boiler 8 output from the boiler exhaust gas / engine exhaust gas comparison unit 46 (differential pressure). Based on the above, the rotational speed of the blower 14 is controlled.
  • the rotational speed of the blower 14 is controlled to a rotational speed necessary for causing the boiler exhaust gas to flow into the exhaust passage 11 against the pressure of the engine exhaust gas discharged from the main engine 2.
  • the rotational speed is controlled to be higher as the differential pressure between the pressure of the engine exhaust gas discharged from the main engine 2 and the pressure of the boiler exhaust gas discharged from the boiler 8 is larger.
  • the rotation number is calculated based on, for example, a map that defines the relationship between the differential pressure and the rotation number. For example, in order to control the temperature of the denitration reactor 26 measured by the denitration reactor temperature sensor 35 to the target temperature (for example, the first specified temperature), the feedback control or the disturbance including the output fluctuation of the main engine 2 is compensated. You may comprise so that the rotation speed of the air blower 14 may be controlled by feedforward control to perform.
  • the boiler exhaust gas / engine exhaust gas comparison unit 46 is a comparison unit that compares the pressure of the engine exhaust gas discharged from the main engine 2 with the pressure of the boiler exhaust gas discharged from the boiler 8.
  • the boiler exhaust gas / engine exhaust gas comparison unit 46 includes the pressure of the engine exhaust gas discharged from the main engine 2 measured by the engine exhaust gas pressure sensor 31 and the boiler exhaust gas discharged from the boiler 8 measured by the boiler exhaust gas pressure sensor 32. The pressure is input. The pressure difference between the engine exhaust gas discharged from the main engine 2 and the boiler exhaust gas discharged from the boiler 8 is output to the operation unit 41.
  • the boiler exhaust gas temperature comparison unit 47 is a comparison unit that compares the temperature of the boiler exhaust gas input from the boiler exhaust gas temperature sensor 34 with the set temperature preset in the boiler exhaust gas specified temperature setting unit 48.
  • the set temperature set by the boiler exhaust gas specified temperature setting unit 48 is, for example, the temperature of the boiler exhaust gas necessary for heating the denitration catalyst 26a to the first specified temperature when the boiler exhaust gas is supplied to the denitration reactor 26. is there.
  • the temperature of the boiler exhaust gas discharged from the boiler 8 and the comparison result between the temperature of the boiler exhaust gas and the set temperature set by the boiler exhaust gas specified temperature setting unit 48 are output to the heating execution determination unit 42. ing.
  • the engine exhaust gas temperature comparison unit 50 is a comparison unit that compares the temperature of the engine exhaust gas input from the engine exhaust gas temperature sensor 33 with the set temperature preset in the engine exhaust gas specified temperature setting unit 49. For example, when the engine exhaust gas discharged from the main engine 2 is supplied to the denitration reactor 26, the set temperature set by the engine exhaust gas specified temperature setting unit 49 is used to heat the denitration catalyst 26a to the first specified temperature. It is the above-mentioned second specified temperature, which is the temperature of the required engine exhaust gas. Then, a comparison result between the temperature of the engine exhaust gas discharged from the main engine 2 and the temperature of the engine exhaust gas discharged from the main engine 2 and the set temperature set by the engine exhaust gas specified temperature setting unit 49 is used as a heating execution determination unit. It is configured to output to 42.
  • FIG. 4 is a block diagram of the control device 40 showing a configuration in particular when the denitration catalyst 26a is activated during regeneration.
  • the control device 40 includes an operation unit 41, a regeneration execution determination unit 43, a regeneration necessity determination unit 45, a boiler exhaust gas / engine exhaust gas comparison unit 46, a boiler exhaust gas temperature comparison unit 47, a boiler exhaust gas regulation.
  • Temperature setting unit 48, engine exhaust gas specified temperature setting unit 49, engine exhaust gas temperature comparison unit 50, denitration reactor differential pressure calculation unit 52, denitration catalyst regeneration comparison unit 53, continuous operation time counting unit 54, denitration catalyst regeneration interval setting unit 55 Is included.
  • the regeneration necessity determination unit 45 is based on a comparison result between the differential pressure before and after the denitration reactor 26 input from the denitration reactor differential pressure sensor 36 and the differential pressure calculated by the denitration reactor differential pressure calculation unit 52.
  • the determination unit determines whether or not it is necessary to regenerate the denitration catalyst 26a.
  • an appropriate differential pressure (denitration catalyst 26a of the denitration catalyst 26a) in the operation state based on the engine operation load signal 37 relating to the engine speed, torque, etc., output from the ECU (not shown) or the like. Calculate the differential pressure that can be determined that poisoning is not progressing.
  • the differential pressure across the denitration reactor 26 is equal to or greater than the calculated differential pressure calculated by the denitration reactor differential pressure calculation unit 52, it is determined that poisoning of the denitration catalyst 26a is in progress, It is determined that regeneration of the denitration catalyst 26a is necessary. If the differential pressure across the denitration reactor 26 is less than the calculated differential pressure, it is determined that regeneration of the denitration catalyst 26a is not necessary. And it is comprised so that the determination result may be output to the reproduction
  • the regeneration necessity determination unit 45 determines whether or not it is necessary to regenerate the denitration catalyst 26a based on the output from the denitration catalyst regeneration comparison unit 53.
  • the denitration catalyst regeneration comparison unit 53 compares the continuous operation time output from the continuous operation time count unit 54 with the specified continuous operation time, and also calculates the elapsed time from the previous regeneration output from the denitration catalyst regeneration interval count unit 55. It is a comparison unit that compares a specified reproduction interval. When the counted continuous operation time exceeds the specified continuous operation time, and when the elapsed time from the counted previous regeneration exceeds the specified regeneration interval, when it corresponds to at least one of the following, The comparison result is output to the reproduction necessity determination unit 45.
  • the regeneration necessity determination unit 45 receiving such output from the denitration catalyst regeneration comparison unit 53 needs to regenerate the denitration catalyst 26a even if the differential pressure across the denitration reactor 26 is less than the calculated differential pressure. It is determined that there is.
  • “at the time of regeneration of the denitration catalyst” means a state in which measures are taken to restore the performance of the denitration catalyst 26a whose performance has been reduced by poisoning, and specifically, on the surface of the denitration catalyst 26a. It means that the denitration catalyst 26a is heated to a temperature equal to or higher than a third specified temperature, which is a temperature necessary for regenerating the denitration catalyst 26a (regeneration temperature), in order to heat and remove the attached acidic ammonium sulfate. Whether or not the denitration catalyst 26a is poisoned is determined, for example, that the denitration catalyst 26a is poisoned when the differential pressure across the denitration reactor 26 is greater than or equal to a predetermined value. Further, for example, when the NOx concentration difference between before and after the denitration reactor 26 becomes less than a predetermined value, it may be determined that the denitration catalyst 26a is poisoned.
  • the regeneration execution determination unit 43 determines whether or not to actually regenerate the denitration catalyst 26a when the regeneration necessity determination unit 45 determines that regeneration of the denitration catalyst 26a is necessary. Part. Based on the output from the boiler exhaust gas temperature comparison unit 47 and the output from the engine exhaust gas temperature comparison unit 50, the regeneration execution determination unit 43 determines whether or not to regenerate the denitration catalyst 26a with boiler exhaust gas. Do.
  • the temperature of the denitration reactor 26 when the temperature of the denitration reactor 26 is higher than the third specified temperature, it is considered that the denitration catalyst 26a is already in a regenerated state, and therefore it is determined that heating with boiler exhaust gas is not performed.
  • the temperature of the engine exhaust gas discharged from the main engine 2 is almost lower than the fourth specified temperature.
  • the temperature of the engine exhaust gas is higher than the fourth specified temperature.
  • the NOx removal catalyst 26a can be heated to the third specified temperature by the engine exhaust gas discharged from the main engine 2, it is determined that the regeneration using the boiler exhaust gas is not executed.
  • the temperature of the boiler exhaust gas discharged from the boiler 8 when the temperature of the boiler exhaust gas discharged from the boiler 8 is lower than the temperature of the engine exhaust gas discharged from the main engine 2, the boiler exhaust gas cannot be heated, so the regeneration using the boiler exhaust gas is executed. Judge that it is not.
  • the temperature of the boiler exhaust gas discharged from the boiler 8 may be lower than the temperature required to heat the denitration catalyst 26a to the third specified temperature when the boiler exhaust gas is supplied to the denitration reactor 26.
  • it is determined that regeneration of the denitration catalyst 26a by boiler exhaust gas is performed.
  • the fourth specified temperature is the temperature of the engine exhaust gas necessary for heating the denitration catalyst 26a to the third specified temperature when the engine exhaust gas discharged from the main engine is supplied to the denitration reactor 26. is there.
  • the fourth specified temperature is set as a temperature equal to or higher than the third specified temperature.
  • the temperature of the engine exhaust gas is measured by the engine exhaust gas temperature sensor 33, and the temperature drop due to heat radiation from the exhaust pipe in the section of the denitration reactor 26a from the engine exhaust gas temperature sensor 33 is reduced.
  • the fourth specified temperature is set as a temperature higher than the third specified temperature in anticipation of a temperature drop due to this heat dissipation.
  • the fourth specified temperature is set to the same temperature as the third specified temperature.
  • the operation unit 41 is a control unit for controlling the opening degree of the boiler exhaust gas control valve 13 and controlling the ON / OFF of the blower 14 and its rotational speed.
  • the operation unit 41 opens or closes the boiler exhaust gas control valve 13 and controls ON / OFF of the operation of the blower 14 based on the determination result of the necessity of heating execution output from the regeneration execution determination unit 43. .
  • the boiler exhaust gas control valve 13 is opened and the operation of the blower 14 is turned ON.
  • the boiler exhaust gas control valve 13 is closed and the operation of the blower 14 is turned off.
  • the operation unit 41 compares the pressure of the engine exhaust gas discharged from the main engine 2 and the pressure of the boiler exhaust gas discharged from the boiler 8 output from the boiler exhaust gas / engine exhaust gas comparison unit 46 (differential pressure). Based on the above, the rotational speed of the blower 14 is controlled.
  • the rotational speed of the blower 14 is controlled to a rotational speed necessary for causing the boiler exhaust gas to flow into the exhaust passage 11 against the pressure of the engine exhaust gas discharged from the main engine 2.
  • the rotational speed is controlled to be higher as the differential pressure between the pressure of the engine exhaust gas discharged from the main engine 2 and the pressure of the boiler exhaust gas discharged from the boiler 8 is larger.
  • the rotation number is calculated based on, for example, a map that defines the relationship between the differential pressure and the rotation number. Further, for example, in order to control the temperature of the denitration reactor 26 measured by the denitration reactor temperature sensor 35 to a target temperature (for example, the third specified temperature), feedback control or feed with the fluctuation of the output of the main engine 2 as a disturbance. You may comprise so that the rotation speed of the air blower 14 may be controlled by forward control.
  • the boiler exhaust gas temperature comparison unit 47 calculates the boiler exhaust gas temperature input from the boiler exhaust gas temperature sensor 34 and the preset temperature set in advance in the boiler exhaust gas specified temperature setting unit 48. It is a comparison part to compare. For example, when the boiler exhaust gas is supplied to the denitration reactor 26, the set temperature set by the boiler exhaust gas specified temperature setting unit 48 is a temperature necessary for heating the denitration catalyst 26a to the third specified temperature. The temperature of the boiler exhaust gas discharged from the boiler 8 and the comparison result between the temperature of the boiler exhaust gas and the set temperature set by the boiler exhaust gas specified temperature setting unit 48 are output to the regeneration execution determination unit 43. ing.
  • the engine exhaust gas temperature comparison unit 50 calculates the temperature of the engine exhaust gas input from the engine exhaust gas temperature sensor 33 and the preset temperature set in the engine exhaust gas specified temperature setting unit 49. It is a comparison part to compare. For example, when the engine exhaust gas discharged from the main engine 2 is supplied to the denitration reactor 26, the set temperature set by the engine exhaust gas specified temperature setting unit 49 is used to heat the denitration catalyst 26a to the third specified temperature. The above-mentioned fourth specified temperature, which is the temperature of the required engine exhaust gas.
  • the regeneration execution determination unit compares the temperature of the engine exhaust gas discharged from the main engine 2 and the comparison result between the temperature of the engine exhaust gas discharged from the main engine 2 and the set temperature set by the engine exhaust gas specified temperature setting unit 49. It is configured to output to 43.
  • FIG. 5 is a control flow diagram of the control device according to the embodiment of the present invention, and is a diagram showing a flow of heating control of the denitration catalyst when the main engine is started or during low load operation.
  • the temperature of the denitration reactor 26 input from the denitration reactor temperature sensor 35, and the denitration
  • the preset temperature (first specified temperature) set in advance in the reactor specified temperature setting unit 51 is compared.
  • the process proceeds to the next step (S53).
  • the denitration catalyst 26a When the temperature of the denitration reactor 26 is equal to or higher than the first specified temperature, which is the activation temperature of the denitration catalyst 26a ("YES" in S53), the denitration catalyst 26a is not required to be heated, so Control is terminated without performing control.
  • the heating execution determination unit 42 compares whether or not the temperature of the engine exhaust gas discharged from the main engine 2 is lower than the second specified temperature (S53). When the temperature of the engine exhaust gas discharged from main engine 2 is lower than the second specified temperature (“YES” in S53), the process proceeds to the next step (S54). When the temperature of the engine exhaust gas is equal to or higher than the second specified temperature (“NO” in S53), the temperature of the denitration reactor 26 can be heated to the first specified temperature only by the engine exhaust gas. The control is terminated without performing the heating control.
  • the heating execution determination unit 42 compares the temperature of the boiler exhaust gas discharged from the boiler 8 with the temperature of the engine exhaust gas discharged from the main engine 2 (S54).
  • the process proceeds to the next step (S55).
  • the temperature of the boiler exhaust gas is lower than the temperature of the engine exhaust gas discharged from the main engine 2 (“NO” in S54)
  • the boiler exhaust gas cannot be heated, so the heating control of the denitration catalyst 26a by the boiler exhaust gas is Control is terminated without performing.
  • S54 is executed after S53, but the order of S53 and S54 is not limited to this. S54 may be executed before S53, or both steps may be executed simultaneously.
  • the boiler exhaust gas discharged from the boiler 8 is passed through the boiler exhaust gas conduit 12 and the denitration reactor 26 in the exhaust passage 11. It is led upstream.
  • the engine exhaust gas flowing through the exhaust passage 11 and the boiler exhaust gas are mixed to generate exhaust gas having a temperature higher than that of the engine exhaust gas (engine / boiler mixed exhaust gas).
  • the high-temperature exhaust gas (engine / boiler mixed exhaust gas) is supplied to the denitration reactor 26 (S56), whereby the denitration reactor 26 is heated.
  • the denitration reactor 26 may be heated by bypassing the engine exhaust gas via the bypass passage 15 and supplying only the high-temperature boiler exhaust gas to the denitration reactor 26 (S56). .
  • the boiler exhaust gas is continuously supplied to the denitration reactor 26 until the temperature of the denitration reactor 26 reaches the first specified temperature (S57). Further, even after the temperature of the denitration reactor 26 reaches the first specified temperature, the boiler exhaust gas is denitrated until the temperature of the engine exhaust gas discharged from the main engine 2 rises to the second specified temperature or higher. The supply to the container 26 may be continued (S58).
  • FIG. 6 is a control flow diagram of the control device according to the embodiment of the present invention, and is a view showing a flow of regeneration control of the denitration catalyst during regeneration of the denitration catalyst.
  • the regeneration necessity determination unit 45 receives the differential pressure across the denitration reactor 26 input from the denitration reactor differential pressure sensor 36, and the denitration.
  • the calculated differential pressure calculated in the reactor differential pressure calculation unit 52 is compared (S62). When the pressure difference across the denitration reactor 26 is less than the calculated differential pressure (“YES” in S62), the process proceeds to the next step.
  • the denitration catalyst regeneration comparing unit 53 compares the continuous operation time output from the continuous operation time counting unit 54 with the specified continuous operation time (S63). If the continuous operation time output from the continuous operation time counting unit 54 is less than the prescribed continuous operation time (“YES” in S63), the process proceeds to the next step.
  • the denitration catalyst regeneration comparison unit 53 compares the elapsed time from the previous regeneration output from the denitration catalyst regeneration interval count unit 55 with a specified regeneration interval (S64). If the elapsed time from the previous regeneration output from the denitration catalyst regeneration interval count unit 55 is less than the prescribed regeneration interval (“YES” in S64), the regeneration of the denitration catalyst 26a is not performed (S65), and the control is performed. Exit. For convenience of explanation, it has been described that the processes are executed in the order of S62, S63, and S64. However, the order of S62 to S64 is not limited to this. The order of S62 to S64 may be changed, and S62 to S64 may be executed simultaneously.
  • the regeneration execution determination unit 43 compares whether the temperature of the denitration reactor 26 is lower than the third specified temperature (S67). When the temperature of the denitration reactor 26 is lower than the third specified temperature (“YES” in S67), the process proceeds to the next step (S68). When the temperature of the denitration reactor 26 is equal to or higher than the third specified temperature (“NO” in S67), it is considered that the denitration catalyst 26a is already in a regenerated state, and thus regeneration control of the denitration catalyst 26a with boiler exhaust gas is not performed. End control.
  • the regeneration execution determination unit 43 compares whether the temperature of the engine exhaust gas discharged from the main engine 2 is lower than the fourth specified temperature (S68).
  • the process proceeds to the next step (S69).
  • the temperature of the engine exhaust gas discharged from main engine 2 is equal to or higher than the fourth specified temperature (“NO” in S68)
  • the temperature of denitration reactor 26 can be heated to the third specified temperature only by engine exhaust gas. Then, the regeneration control of the denitration catalyst 26a by the boiler exhaust gas is not performed, and the control is finished.
  • the regeneration execution determination unit 43 compares the temperature of the boiler exhaust gas discharged from the boiler 8 with the temperature of the engine exhaust gas discharged from the main engine 2 (S69).
  • the temperature of the boiler exhaust gas is equal to or higher than the temperature of the engine exhaust gas discharged from main engine 2 (“YES” in S69)
  • the process proceeds to the next step (S610).
  • the temperature of the boiler exhaust gas is lower than the temperature of the engine exhaust gas discharged from the main engine 2 ("NO" in S69)
  • the boiler exhaust gas cannot be heated, so the regeneration control of the denitration catalyst 26a by the boiler exhaust gas is Control is terminated without performing.
  • the air blower 14 is started (S610). Then, the boiler exhaust gas is supplied to the denitration reactor (S611), the denitration reactor 26 is heated by the high temperature boiler exhaust gas, and the denitration catalyst 26a is regenerated.
  • the boiler exhaust gas discharged from the boiler 8 is passed through the boiler exhaust gas conduit 12 and the denitration reactor 26 in the exhaust passage 11. It is led upstream.
  • the engine exhaust gas flowing through the exhaust passage 11 and the boiler exhaust gas are mixed to generate exhaust gas having a temperature higher than that of the engine exhaust gas (engine / boiler mixed exhaust gas).
  • the high-temperature exhaust gas (engine / boiler mixed exhaust gas) is supplied to the denitration reactor 26 (S611), whereby the denitration reactor 26 is heated and the denitration catalyst 26a is regenerated.
  • the denitration reactor 26 may be controlled to be heated by bypassing the engine exhaust gas via the bypass channel 15 and supplying only the high-temperature boiler exhaust gas to the denitration reactor 26 (S611). .
  • the boiler exhaust gas is continuously supplied to the denitration reactor 26 until the temperature of the denitration reactor 26 reaches the third specified temperature (S612). Further, even after the temperature of the denitration reactor 26 reaches the third specified temperature, the boiler exhaust gas may continue to be supplied to the denitration reactor 26 until the specified regeneration time elapses (S613). .
  • FIG. 7 is a timing chart showing the supply timing of boiler exhaust gas and the operation timing of the exhaust gas denitration system in the exhaust gas denitration apparatus according to one embodiment of the present invention.
  • the boiler exhaust gas control valve 13 is opened and the blower 14 is turned on almost simultaneously with the start of operation of the main engine 2 to start supplying boiler exhaust gas.
  • time t1 high-temperature exhaust gas (engine / boiler mixed exhaust gas) in which engine exhaust gas and boiler exhaust gas are mixed is supplied to the denitration reactor 26, and the temperature of the denitration reactor 26 gradually rises, and at time t2, the denitration catalyst 26a. It reaches the first specified temperature or higher, which is the activation temperature.
  • the boiler exhaust gas control valve 13 is based on the temperature of the engine exhaust gas discharged from the main engine 2, the temperature of the boiler exhaust gas discharged from the boiler 8, and the temperature of the denitration reactor 26. Is further provided with a control device 40 that controls the opening or closing of the valve and ON / OFF of the operation of the blower 14. Therefore, based on the temperature of the engine exhaust gas discharged from the main engine 2, the temperature of the boiler exhaust gas discharged from the boiler 8, and the temperature of the denitration reactor 26, the boiler exhaust gas control valve 13 is opened or closed, ON / OFF of the operation of the blower 14 can be controlled by the control device 40.
  • the engine in which the temperature of the denitration reactor 26 is as low as less than the first specified temperature and the temperature of the boiler exhaust gas discharged from the boiler 8 is discharged from the main engine 2.
  • the temperature of the exhaust gas is higher than that, the boiler exhaust gas discharged from the boiler 8 is supplied to the denitration reactor 26, whereby the denitration catalyst 26a can be heated by the high-temperature boiler exhaust gas.
  • the engine in which the temperature of the denitration reactor 26 is as low as less than the third specified temperature and the temperature of the boiler exhaust gas discharged from the boiler 8 is discharged from the main engine 2.
  • the temperature of the exhaust gas is higher, the boiler exhaust gas discharged from the boiler 8 is supplied to the denitration reactor 26, whereby the denitration catalyst 26a is heated by the high-temperature boiler exhaust gas and the poisoned denitration catalyst 26a is regenerated. I can do it.
  • FIG. 8 is a diagram illustrating a state in which purge gas is supplied to a section of the exhaust flow channel between the exhaust flow channel side branch valve and the exhaust flow channel side junction valve.
  • FIG. 9 is a timing chart for explaining the supply timing of the purge gas.
  • the control device 40 closes the exhaust passage side branch valve 16 ⁇ / b> A and opens the bypass passage side branch valve 16 ⁇ / b> B when the exhaust gas denitration system 20 is not operating. Then, the exhaust flow path side merge valve 17A is closed, and the bypass flow path side merge valve 17B is opened.
  • the purge gas supply device 18 is controlled so as to supply the purge gas to a section of the exhaust flow channel 11 between the exhaust flow channel side branch valve 16A and the exhaust flow channel side junction valve 17A. At this time, the boiler exhaust gas control valve 13 is in a closed state.
  • the state in which the exhaust gas denitration system 20 is operating means a state in which the reducing agent is injected from the reducing agent injection nozzle 24 into the exhaust passage 11 and a state in which the reducing agent is injected from the reducing agent injection nozzle 24.
  • high temperature exhaust gas (engine / boiler mixed exhaust gas, engine exhaust gas, or boiler exhaust gas) is supplied to the denitration reactor 26, and the denitration reactor 26 is heated to the third specified temperature to regenerate the denitration catalyst 26a. Means both.
  • the timings for supplying the purge gas to the section between the exhaust flow channel side branch valve 16A and the exhaust flow channel side junction valve 17A in the exhaust flow channel 11 include the three timings shown in FIGS. .
  • the purge gas is input only once.
  • the purge gas is input a plurality of times at predetermined intervals.
  • the purge gas is continuously input after the operation of the exhaust gas denitration system 20 is completed.
  • the control device 40 can seal the purge gas in a section of the exhaust flow channel 11 between the exhaust flow channel side branch valve 16A and the exhaust flow channel side junction valve 17A.
  • the engine exhaust gas leaked from the exhaust passage side branch valve 16A and the exhaust passage side junction valve 17A in the closed state to the exhaust passage 11 side is removed from the NOx removal catalyst 26a. be contacted in nitric acid (HNO 3) can be reliably prevented from being generated.
  • HNO 3 nitric acid
  • FIG. 10 is a diagram showing a state in which boiler exhaust gas is supplied to the denitration reactor after the operation of the denitration system is completed.
  • the control device 40 closes the exhaust passage side branch valve 16A and opens the bypass passage side branch valve 16B.
  • the exhaust flow path side merge valve 17A is opened, and the bypass flow path side merge valve 17B is opened.
  • the boiler exhaust gas control valve 13 is opened and the operation of the blower 14 is turned ON, so that the boiler exhaust gas discharged from the boiler 8 is supplied to the denitration reactor 26 for a predetermined time.
  • the boiler exhaust gas is supplied to the denitration reactor 26 for a predetermined time after the denitration system 20 is operated. Thereby, the progress of poisoning in the denitration catalyst 26a can be suppressed, and the regeneration interval of the denitration catalyst 26a can be lengthened.
  • An exhaust gas denitration apparatus control method is an exhaust gas denitration apparatus for reducing nitrogen oxides contained in engine exhaust gas discharged from a main engine 2 mounted on a ship 1. 10 (10A, 10B) control method.
  • the exhaust gas denitration apparatus 10 (10A, 10B) includes an exhaust passage 11 through which engine exhaust gas discharged from the main engine 2 flows, a reducing agent storage tank 22 for storing a reducing agent, and a reduction agent stored in the reducing agent storage tank 22.
  • a denitration reactor 26 having a reducing agent injection nozzle 24 for injecting the agent into the engine exhaust gas flowing through the exhaust passage 11 and a catalyst 26a provided on the exhaust passage 11 for reducing nitrogen oxides contained in the engine exhaust gas.
  • An engine exhaust gas denitration system 20 a boiler exhaust gas channel 12 that guides boiler exhaust gas discharged from the boiler 8 mounted on the ship 1 to the upstream side of the denitration reactor 26 in the exhaust channel 11, A boiler exhaust gas control valve 13 for controlling the flow of the boiler exhaust gas in the boiler exhaust gas conduit 12 and the boiler exhaust gas flowing in the boiler exhaust gas conduit 12 A blower 14 for blowing air to the downstream side, and a.
  • the control method of the exhaust gas denitration apparatus includes a step of opening or closing the boiler exhaust gas control valve 13 and a step of controlling ON / OFF of the operation of the blower 14.
  • the control method of the exhaust gas denitration device 10 (10A, 10B) for reducing nitrogen oxides contained in the engine exhaust gas discharged from the main engine 2 mounted on the ship 1 A step of opening or closing the boiler exhaust gas control valve 13 and a step of controlling ON / OFF of the operation of the blower 14. Therefore, the boiler exhaust gas discharged from the boiler 8 can be supplied to the denitration reactor 26 as necessary, and the denitration catalyst 26a can be heated.
  • the boiler exhaust gas control valve 13 is opened based on the temperature of the engine exhaust gas discharged from the main engine 2, the temperature of the boiler exhaust gas discharged from the boiler 8, and the temperature of the denitration reactor 26.
  • the method further includes a step of closing or closing the valve and a step of controlling ON / OFF of the operation of the blower 14.
  • the temperature of the denitration reactor 26 is less than the first specified temperature and the temperature of the engine exhaust gas discharged from the main engine 2 is the second specified value when the main engine 2 is started or operated at a low load.
  • the boiler exhaust gas control valve 13 is opened and the blower 14 is operated. Is further provided with a step of supplying boiler exhaust gas discharged from the boiler 8 to the denitration reactor 26.
  • the temperature of the denitration reactor 26 is less than the third specified temperature, and the temperature of the engine exhaust gas discharged from the main engine 2 is less than the fourth specified temperature,
  • the boiler exhaust gas control valve 13 is opened and the operation of the blower 14 is turned on, so that the boiler 8 A step of supplying the boiler exhaust gas discharged from the reactor to the denitration reactor 26.
  • the exhaust passage side branch valve 16A when the exhaust gas denitration system 20 is not in operation, the exhaust passage side branch valve 16A is closed, the bypass passage side branch valve 16B is opened, and the exhaust passage side junction valve 17A is closed.
  • the step of opening the bypass flow path side confluence valve 17B and the purge gas supply device 18 are controlled so as to supply the purge gas to the section of the exhaust flow path 11 between the exhaust flow path side branch valve 16A and the exhaust flow path side confluence valve 17A. Further comprising the step of:
  • the exhaust passage side branch valve 17A is closed, the bypass passage side branch valve 17B is opened, the exhaust passage side junction valve 17A is opened,
  • the step of opening the bypass flow path side junction valve 17B, the opening of the boiler exhaust gas control valve 13 and the operation of the blower 14 are turned on, and the boiler exhaust gas discharged from the boiler 8 is supplied to the denitration reactor 26 for a predetermined time. A step.

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  • Engineering & Computer Science (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
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  • Exhaust Gas After Treatment (AREA)
PCT/JP2017/003570 2016-02-16 2017-02-01 排ガス脱硝装置および排ガス脱硝装置の制御方法 WO2017141705A1 (ja)

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CN201780011241.8A CN108884736B (zh) 2016-02-16 2017-02-01 废气脱硝装置和废气脱硝装置的控制方法

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JP2001349206A (ja) * 2000-06-06 2001-12-21 Toshiba Corp コンバインドサイクル発電プラントの脱硝制御方法および装置
JP2009222005A (ja) * 2008-03-18 2009-10-01 Mitsubishi Heavy Ind Ltd 低温脱硝装置
JP2014070751A (ja) * 2012-09-28 2014-04-21 Miura Co Ltd 蒸気発生システム

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JP2752114B2 (ja) * 1988-12-01 1998-05-18 バブコツク日立株式会社 都市型コージエネ装置
JP2007182812A (ja) * 2006-01-06 2007-07-19 Mitsui Eng & Shipbuild Co Ltd 排ガスの脱硝方法
JP5028165B2 (ja) * 2007-07-03 2012-09-19 日立建機株式会社 エンジン動力機械
JP2012047095A (ja) * 2010-08-26 2012-03-08 Mitsubishi Heavy Ind Ltd 舶用脱硝システムおよびこれを備えた船舶
JP5995400B2 (ja) * 2010-10-14 2016-09-21 三菱重工業株式会社 舶用排気ガス脱硝装置

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Publication number Priority date Publication date Assignee Title
JP2001349206A (ja) * 2000-06-06 2001-12-21 Toshiba Corp コンバインドサイクル発電プラントの脱硝制御方法および装置
JP2009222005A (ja) * 2008-03-18 2009-10-01 Mitsubishi Heavy Ind Ltd 低温脱硝装置
JP2014070751A (ja) * 2012-09-28 2014-04-21 Miura Co Ltd 蒸気発生システム

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CN108884736B (zh) 2020-12-08
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