Device and method for removing NOX from flue gas using co generated from boiler combustion

Abstract

Embodiments of the present disclosure provide a device for removing NOx from flue gas using CO generated from boiler combustion. The device comprises a carbon dioxide reduction generator, a mixer, and an SCR denitrification apparatus, wherein the carbon dioxide reduction generator is in communication with a boiler and the mixer, and is configured to catalytically reduce carbon dioxide in the desulfurized flue gas from the boiler into carbon monoxide; the mixer is configured to mix the carbon monoxide generated by the carbon dioxide reduction generator with air; and the SCR denitrification apparatus comprises a denitrification flue duct, and a reductant injection and mixing section and a CO-SCR denitrification catalytic section which are arranged in a flue denitrification reactor, the denitrification flue duct being in communication with the boiler, the reductant injection and mixing section being in communication with an output end of the mixer and being configured to supplement a gas mixture of carbon monoxide and air to the denitrification flue duct, and the CO-SCR denitrification catalytic section being configured to perform denitrification treatment on NOx in the flue gas by using carbon monoxide in the flue gas generated by the boiler and in the gas mixture supplemented by the mixer.

Description

Apparatus and method for removing NOx from flue gas using CO generated by boiler combustion

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202411381828.6, filed on September 30, 2024, and entitled “Apparatus and method for removing NOx from flue gas using CO generated by boiler combustion”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure belong to the technical field of flue gas denitration, and particularly relate to an apparatus and method for removing NOx from flue gas using CO generated by boiler combustion. BACKGROUND

[0004] The ammonia method SCR technology (NH3-SCR) using ammonia or urea as a reducing agent is the most widely used selective catalytic reduction NOx technology in industry. Currently, more than 95% of coal-fired units achieve ultra-low NOx emissions. A large number of units have problems of ammonia escape exceeding the standard due to unreasonable design of denitration flow field, wear of guide vanes, wear of catalyst, and other reasons, as well as the resulting problems of ammonium bisulfate blocking the air preheater, etc. Therefore, controlling ammonia escape increases the operation difficulty and cost of this technology. On the other hand, traditional coal-fired units need to increase the deep peak shaving capacity to release space for new energy construction. In this case, the flue gas temperature of the catalyst in a considerable number of units under low load conditions is usually lower than the minimum ammonia injection temperature, so that NOx cannot meet the emission standard. Therefore, many scholars are also researching alternative technologies for NH3-SCR denitration.

[0005] CO is a common incomplete combustion product, and CO and NOx almost exist in the flue gas of carbon-based fuel combustion equipment, such as power station boilers, industrial boilers, diesel engines, and gasoline engines, etc. CO has strong reducing properties, and it is feasible to use CO as a reducing agent to catalytically remove NOx (CO-SCR), especially in the field of flue gas purification in power station boilers, industrial boilers, and steelmaking industry, etc. Therefore, the idea of “using harm to eliminate harm” can simultaneously achieve the removal of CO and NOx, which has great economic and environmental characteristics. SUMMARY

[0006] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide an apparatus and method for removing NOx from flue gas using CO generated by boiler combustion.

[0007] In a first aspect, an apparatus for removing NOx from flue gas using CO generated by boiler combustion is provided, the apparatus comprising a carbon dioxide reduction generator, a mixer, and an SCR denitration device.

[0008] The carbon dioxide reduction generator is in communication with the boiler and the mixer respectively; the carbon dioxide reduction generator is used for catalytically reducing the carbon dioxide in the flue gas after desulfurization of the boiler into carbon monoxide; and the mixer is used for mixing the carbon monoxide generated by the carbon dioxide reduction generator with air.

[0009] The SCR denitration device comprises a denitration flue, a reducing agent mixing and spraying part arranged in the denitration flue, and a CO-SCR denitration catalysis part; the denitration flue is in communication with the boiler and is used for passing the flue gas of the boiler into the CO-SCR denitration catalysis part; the reducing agent mixing and spraying part is in communication with the output end of the mixer and is used for supplementing the mixed gas of carbon monoxide and air into the denitration flue.

[0010] The CO-SCR denitration catalysis part uses the flue gas generated by the boiler and the carbon monoxide in the mixed gas supplemented by the mixer to perform denitration treatment on the NOx component in the flue gas.

[0011] Optionally, the denitration flue comprises an SCR horizontal flue, an SCR inlet flue, an SCR reactor, and an SCR outlet flue; the SCR horizontal flue, the SCR inlet flue, the SCR reactor, and the SCR outlet flue are connected in sequence.

[0012] The SCR horizontal flue is in communication with the boiler and is used for passing the flue gas of the boiler into the denitration flue; the reducing agent mixing and spraying part is arranged in the inlet flue; and the CO-SCR denitration catalysis part is arranged in the reactor.

[0013] Optionally, the device further comprises:

[0014] A flow guide part arranged in the denitration flue, the flow guide part being used for guiding the flue gas to flow more uniformly in the denitration flue.

[0015] Optionally, the flow guide part is a plurality of flow guide parts, and the plurality of flow guide parts are arranged at intervals in the denitration flue.

[0016] Optionally, the flow guide part is a plurality of flow guide parts, and the plurality of flow guide parts are arranged at intervals in the denitration flue; and the reducing agent mixing and spraying part is arranged between two adjacent flow guide parts.

[0017] Optionally, the CO-SCR denitration catalysis part is a plurality of CO-SCR denitration catalysis parts, and the plurality of CO-SCR denitration catalysis parts are arranged at intervals in the denitration flue.

[0018] Further, the device further comprises a flow regulating valve and a CO flow meter.

[0019] The flow regulating valve and the CO flow meter are arranged between the carbon dioxide reduction generator and the mixer; wherein the carbon dioxide reduction generator, the flow regulating valve, the CO flow meter and the mixer are sequentially connected.

[0020] Further, the dilution fan and the air flow meter are further included.

[0021] The dilution fan, the air flow meter and the mixer are sequentially connected.

[0022] Optionally, the denitration flue inlet is in communication with the economizer outlet flue of the boiler tail.

[0023] In a second aspect of the embodiments of the present disclosure, a method for removing NOx in flue gas by using CO generated by boiler combustion is provided, and the method is implemented according to the device described above, and the method comprises the following steps:

[0024] The carbon dioxide in the desulfurized flue gas of the boiler is catalytically reduced into carbon monoxide by using the carbon dioxide reduction generator.

[0025] The carbon monoxide generated by the carbon dioxide reduction generator is mixed with air by using the mixer.

[0026] The carbon monoxide in the flue gas generated by the boiler and the mixed gas supplemented by the mixer is subjected to a denitration reaction with the CO-SCR denitration catalytic part to perform denitration treatment on the NOx component in the flue gas.

[0027] The embodiments of the present disclosure have the following beneficial effects:

[0028] In the present disclosure, on the one hand, the denitration reducing agent (CO) required by the CO-SCR denitration catalytic part is directly derived from the flue gas of the boiler. On the other hand, the CO2 in the flue gas after desulfurization of the boiler is catalytically oxidized into CO by using the carbon dioxide reduction generator to supplement the denitration reducing agent required by the CO-SCR denitration catalytic part in the denitration flue, so as to provide sufficient denitration reducing agent for the denitration treatment of the CO-SCR denitration catalytic part. Further, the two CO sources are combined to achieve the purpose of removing NO and NO2 in the flue gas, and at the same time, CO is also oxidized into CO2, so as to achieve the simultaneous removal of pollutants and realize the idea of “using harm to eliminate harm”, which has great economic and environmental characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a structural schematic diagram of a device for removing NOx in flue gas by using CO generated by boiler combustion according to an embodiment of the present disclosure;

[0030] FIG. 2 is a flow schematic diagram of a method for removing NOx in flue gas by using CO generated by boiler combustion according to another embodiment of the present disclosure.

[0031] In the figure, 1, dilution fan; 2, air flow meter; 3, carbon dioxide reduction generator; 4, flow regulating valve; 5, CO flow meter; 6, mixer; 7, reducing agent mixing section; 8, economizer outlet flue; 9, SCR horizontal flue; 10, flow guide section; 11, SCR inlet flue; 12, SCR reactor; 13, CO-SCR denitration catalytic section; 14,

[0032] SCR outlet flue. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in combination with the drawings and specific embodiments.

[0034] The embodiments of the present application will be further described in detail below in combination with the drawings and examples. The detailed description of the following examples and the drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0035] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the application of the related CO removal technology for removing NO and NO2 in flue gas, the following problems exist: on the one hand, CO-SCR catalyst is currently in the research stage. On the other hand, the CO content produced by the combustion of coal-fired units is relatively low (if the CO content is too high, the boiler combustion is unstable, and problems such as water wall corrosion are prone to occur), which cannot meet the application requirements.

[0037] To solve the above problems, the present disclosure provides a device for removing NOx from flue gas by using CO generated by boiler combustion, as shown in FIG. 1. The device comprises a carbon dioxide reduction generator 3, a mixer 6 and an SCR denitration equipment.

[0038] The carbon dioxide reduction generator 3 is in communication with the boiler and the mixer 6 respectively. The carbon dioxide reduction generator 3 is used for catalytically reducing carbon dioxide in flue gas after desulfurization of the boiler into carbon monoxide. The mixer 6 is used for mixing carbon monoxide generated by the carbon dioxide reduction generator 3 with air.

[0039] The SCR denitration equipment comprises a denitration flue, and a reducing agent spraying and mixing part 7 and a CO-SCR denitration catalytic part 13 arranged in the denitration flue. The denitration flue is in communication with the boiler, and is used for passing flue gas of the boiler into the CO-SCR denitration catalytic part 13. The reducing agent spraying and mixing part 7 is in communication with the output end of the mixer 6, and is used for supplementing mixed gas of carbon monoxide and air to the denitration flue.

[0040] The CO-SCR denitration catalytic part 13 uses flue gas generated by the boiler and carbon monoxide in the mixed gas supplemented by the mixer 6 to perform denitration treatment on NOx components in the flue gas.

[0041] In the present disclosure, on the one hand, the denitration reducing agent (CO) required by the CO-SCR denitration catalytic part 13 directly comes from the flue gas of the boiler. On the other hand, the carbon dioxide reduction generator 3 is used to catalytically oxidize CO2 in flue gas after desulfurization of the boiler into CO to supplement the denitration reducing agent required by the CO-SCR denitration catalytic part 13 in the denitration flue, so as to provide sufficient denitration reducing agent for the denitration treatment of the CO-SCR denitration catalytic part 13. Further, the combination of the two CO sources achieves the purpose of removing NO and NO2 in the flue gas, and at the same time, CO is also oxidized into CO2, achieving the simultaneous removal of pollutants, realizing the idea of “using harm to eliminate harm”, and having great economic and environmental characteristics.

[0042] In some embodiments, the denitration flue comprises an SCR horizontal flue 9, an SCR inlet flue 11, an SCR reactor 12 and an SCR outlet flue 14, which are connected in sequence.

[0043] The SCR horizontal flue 9 is in communication with the boiler, and is used for passing flue gas of the boiler into the denitration flue. The reducing agent spraying and mixing part is arranged in the inlet flue. The CO-SCR denitration catalytic part 13 is arranged in the reactor.

[0044] In some embodiments, a flow guide part 10 is further included. The flow guide part 10 is arranged in the denitration flue, and is used for guiding the flue gas to flow more uniformly in the denitration flue. In some embodiments, the flow guide part 10 comprises a flow guide plate. Specifically, it is a flue gas uniform flow plate.

[0045] In some embodiments, the plurality of flow guide portions 10 are arranged at intervals in the denitration flue. In one embodiment, the plurality of flow guide portions 10 are arranged at equal intervals in the denitration flue. In another embodiment, the plurality of flow guide portions 10 are arranged at unequal intervals in the denitration flue. Arranging the plurality of flow guide portions 10 in the denitration flue can effectively make the flue gas speed more uniform, which is conducive to the denitration reaction.

[0046] In some embodiments, the plurality of flow guide portions 10 are arranged at intervals in the denitration flue, and the reducing agent mixing portion 7 is arranged between two adjacent flow guide portions 10. In one embodiment provided by the present disclosure, the SCR inlet flue 11 is provided with at least two flow guide portions 10 arranged at intervals, and the reducing agent mixing portion 7 is arranged between the two flow guide portions 10, which is used to uniformly spray the mixed gas of carbon monoxide and air in the mixer 6 into the denitration flue to supplement the denitration reducing agent (CO) required by the CO-SCR denitration catalyst portion 13.

[0047] In some embodiments, the reducing agent mixing portion 7 is a CO spray grid having a plurality of nozzles.

[0048] In some embodiments, the plurality of CO-SCR denitration catalyst portions 13 are arranged at intervals in the denitration flue. Specifically, the CO-SCR denitration catalyst portion 13 has a CO-SCR denitration catalyst. Arranging a plurality of CO-SCR denitration catalyst portions 13 can effectively denitrate the NOx component in the flue gas.

[0049] In some embodiments, the flow regulating valve 4 and the CO flow meter 5 are further included. The flow regulating valve 4 and the CO flow meter 5 are arranged between the carbon dioxide reduction generator 3 and the mixer 6, and the carbon dioxide reduction generator 3, the flow regulating valve 4, the CO flow meter 5, and the mixer 6 are connected in sequence. The flow regulating valve 4 and the CO flow meter 5 are arranged to regulate the flow of CO.

[0050] In some embodiments, the dilution fan 1 and the air flow meter 2 are further included. The dilution fan 1, the air flow meter 2, and the mixer 6 are connected in sequence.

[0051] In some embodiments, the denitration flue inlet communicates with the economizer outlet flue 8 of the tail portion of the boiler. Specifically, the SCR horizontal flue 9 of the denitration flue communicates with the economizer outlet flue 8.

[0052] Specifically, the tail flue gas of the boiler after desulfurization contains a large amount of CO2, which is reduced to CO by the carbon dioxide reduction generator 3 (which is provided with a catalyst for reducing CO2 to CO), and then enters the mixer 6 after being measured by the flow regulating valve 4 and the CO flow meter 5.

[0053] The air enters the air flow meter 2 to measure the volume flow rate, and then enters the mixer 6 to mix with CO. The mixed gas of CO and air is sprayed into the SCR inlet flue 11 through the CO spraying grid, and then fully mixes with the NOx in the flue gas to enter the SCR reactor 12. The CO generated by the boiler combustion also mixes with the NOx in the flue gas through the economizer outlet flue 8, and then enters the SCR reactor 12 through the SCR inlet flue 11.

[0054] Further, the CO-SCR denitration catalyst is installed in the SCR reactor 12. The CO in the flue gas is reduced on the surface of the CO-SCR denitration catalyst to generate harmless N2 and CO2, which is then discharged into the atmosphere. In the present disclosure, the CO2 generated by the carbon dioxide reduction generator 3 after the flue gas of the boiler desulfurization is catalytically oxidized into CO can effectively supplement the denitration reducing agent (CO) required by the CO-SCR denitration catalyst 13 in the denitration flue, and make up for the problem of insufficient CO in the boiler flue gas, so as to provide sufficient denitration reducing agent for the denitration treatment of the CO-SCR denitration catalyst 13, so that the whole denitration reaction process does not need to introduce additional CO gas source. In the present disclosure, the CO and CO2 generated by the boiler combustion are completely utilized to generate CO after catalytic reduction, and there is no CO and NOx in the gas after the reaction is completed, which achieves the purpose of treating harm with harm and the purpose of NH3-free denitration.

[0055] Specifically, the dilution fan 1 is used to extract air, and the air flow meter 2 is used to measure the volume flow rate of the extracted air. The carbon dioxide reduction generator 3 is used to catalytically reduce CO2 in the tail flue gas of the coal-fired unit boiler into CO, wherein the carbon dioxide reduction generator 3 has a catalyst capable of catalytically reducing CO2 into CO.

[0056] The flow regulating valve 4 is used to regulate the flow of the CO gas generated by the catalytic reduction of the carbon dioxide reduction generator 3, and the CO flow meter 5 measures the volume flow rate of the CO gas. The CO and the air extracted by the dilution fan 1 are mixed uniformly in the mixer 6.

[0057] The CO and air mixture is uniformly sprayed into the SCR inlet flue 11 through the CO spraying grid. The boiler tail economizer outlet flue 8 is communicated with the SCR horizontal flue 9, which is used to introduce the flue gas into the denitration flue. The denitration flue is provided with a flow guide plate, wherein the flow guide plate is a flue gas flow uniformizing plate, which can make the flue gas velocity distribution more uniform. The SCR horizontal flue 9, the SCR inlet flue 11, the SCR reactor 12 and the SCR outlet flue 14 are connected in sequence, wherein the CO-SCR denitration catalyst 13 is arranged in the SCR reactor 12, and the CO-SCR denitration catalyst 13 has a CO-SCR denitration catalyst.

[0058] Further, the flue gas in the economizer outlet flue 8 of the boiler tail contains a part of CO and NO and NO2, and the part of CO and NO and NO2 pass through the SCR horizontal flue 9 and the SCR inlet flue 11 into the SCR reactor 12, and a denitration reaction occurs in the SCR reactor 12 under the action of the CO-SCR denitration catalyst to generate CO2 and N2 and discharge through the SCR outlet flue 14 and enter the subsequent device. Since the CO content in the economizer outlet flue 8 is small, the NO and NO2 in the flue gas may not be completely reacted, and a part of CO needs to be supplemented. In the present disclosure, the CO to be supplemented is obtained by catalytically reducing a part of CO2 in the flue gas after desulfurization of the boiler into CO, and then spraying the CO grid into the SCR inlet flue 11, mixing uniformly with a part of NO and NO2 in the flue gas, and then entering the SCR reactor 12, and a denitration reaction occurs under the action of the CO-SCR denitration catalyst to generate CO2 and N2 through the SCR outlet flue 14 and enter the subsequent device. That is, the present disclosure combines the two CO sources to achieve the purpose of removing NO and NO2 in the flue gas, and at the same time, the CO is also oxidized into CO2 to achieve simultaneous removal of pollutants.

[0059] As shown in FIG. 2, the second aspect of the embodiment of the present disclosure provides a method for removing NOx in flue gas by using CO generated by boiler combustion, and the method is realized according to the device described above, and the method comprises the following steps:

[0060] S101, catalytically reducing CO2 in the flue gas after desulfurization of the boiler into CO by using the carbon dioxide reduction generator 3.

[0061] S102, mixing the CO generated by the carbon dioxide reduction generator 3 with air by using the mixer 6.

[0062] S103, performing a denitration reaction with the CO-SCR denitration catalyst part 13 by using the flue gas generated by the boiler and the CO in the mixed gas supplemented by the mixer 6, and performing denitration treatment on the NOx components in the flue gas.

[0063] In the present disclosure, on the one hand, the denitration reducing agent (CO) required by the CO-SCR denitration catalyst part 13 is directly derived from the flue gas of the boiler. On the other hand, the CO2 in the flue gas after desulfurization of the boiler is catalytically oxidized into CO by using the carbon dioxide reduction generator 3 to supplement the denitration reducing agent required by the CO-SCR denitration catalyst part 13 in the denitration flue, so as to provide sufficient denitration reducing agent for the denitration treatment of the CO-SCR denitration catalyst part 13. Further, the two CO sources are combined to achieve the purpose of removing NO and NO2 in the flue gas, and at the same time, the CO is also oxidized into CO2 to achieve simultaneous removal of pollutants, which realizes the idea of “using harm to eliminate harm”, and has great economic and environmental characteristics.

[0064] It is understood that the above embodiments are only exemplary for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An apparatus for removing NOx from flue gas using CO produced by combustion in a boiler, characterized by, The device comprises a carbon dioxide reduction generator, a mixer and an SCR denitration device; The carbon dioxide reduction generator is in communication with the boiler and the mixer respectively; the carbon dioxide reduction generator is used for catalytically reducing carbon dioxide in flue gas after desulfurization of the boiler into carbon monoxide; the mixer is used for mixing carbon monoxide generated by the carbon dioxide reduction generator with air; The SCR denitration device comprises a denitration flue, a reducing agent mixing and spraying part arranged in the denitration flue and a CO-SCR denitration catalytic part; the denitration flue is in communication with the boiler and is used for passing flue gas of the boiler into the CO-SCR denitration catalytic part; the reducing agent mixing and spraying part is in communication with the output end of the mixer and is used for supplementing mixed gas of carbon monoxide and air to the denitration flue; The CO-SCR denitration catalytic part uses flue gas generated by the boiler and carbon monoxide in the mixed gas supplemented by the mixer to perform denitration treatment on NOx components in the flue gas.

2. The device for removing NOx in flue gas by using carbon monoxide generated by boiler combustion according to claim 1, wherein The denitration flue comprises an SCR horizontal flue, an SCR inlet flue, an SCR reactor and an SCR outlet flue; the SCR horizontal flue, the SCR inlet flue, the SCR reactor and the SCR outlet flue are connected in sequence; The SCR horizontal flue is in communication with the boiler and is used for passing flue gas of the boiler into the denitration flue; the reducing agent mixing and spraying part is arranged in the inlet flue; the CO-SCR denitration catalytic part is arranged in the reactor.

3. The device for removing NOx from flue gas by CO produced by boiler combustion according to claim 1 or 2, characterized in that, Further comprising: A flow guide part arranged in the denitration flue, the flow guide part is used for guiding the flue gas to flow more uniformly in the denitration flue.

4. The device for removing NOx in flue gas by using carbon monoxide generated by boiler combustion according to claim 3, wherein The flow guide parts are arranged at intervals in the denitration flue.

5. The device for removing NOx in flue gas by using carbon monoxide generated by boiler combustion according to claim 3, wherein The flow guide parts are arranged at intervals in the denitration flue; the reducing agent mixing and spraying part is arranged between two adjacent flow guide parts.

6. The device for removing NOx in flue gas by using carbon monoxide generated by boiler combustion according to claim 1, wherein The CO-SCR denitration catalytic parts are arranged at intervals in the denitration flue.

7. The device for removing NOx from flue gas by using CO produced by boiler combustion according to claim 1, wherein Further comprising a flow regulating valve and a CO flow meter; The flow regulating valve and the CO flow meter are arranged between the carbon dioxide reduction generator and the mixer; the carbon dioxide reduction generator, the flow regulating valve, the CO flow meter and the mixer are connected in sequence.

8. The device for removing NOx from flue gas by CO produced by boiler combustion according to claim 1, characterized in that, Further comprising a dilution fan and an air flow meter; The dilution fan, the air flow meter and the mixer are connected in sequence.

9. The device for removing NOx in flue gas by using carbon monoxide generated by boiler combustion according to claim 1, wherein The denitration flue inlet is communicated with the economizer outlet flue of the boiler tail.

10. A method for removing NOx from flue gas using CO produced by boiler combustion, the method being implemented by the apparatus according to any one of claims 1-9, characterized in that, The application relates to a boiler tail denitration system. Carbon dioxide in boiler desulfurization flue gas is catalytically reduced into carbon monoxide by a carbon dioxide reduction generator; Carbon monoxide generated by the carbon dioxide reduction generator is mixed with air by a mixer; The flue gas generated by the boiler and the carbon monoxide in the mixed gas supplemented by the mixer are used for denitration reaction with a CO-SCR denitration catalytic part, so that the NOx component in the flue gas is subjected to denitration treatment.

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