WO2021088524A1 - 一种烟气脱一氧化碳脱硝的系统及方法 - Google Patents
一种烟气脱一氧化碳脱硝的系统及方法 Download PDFInfo
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- WO2021088524A1 WO2021088524A1 PCT/CN2020/115789 CN2020115789W WO2021088524A1 WO 2021088524 A1 WO2021088524 A1 WO 2021088524A1 CN 2020115789 W CN2020115789 W CN 2020115789W WO 2021088524 A1 WO2021088524 A1 WO 2021088524A1
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- flue gas
- reactor
- pipe
- denitration
- hot air
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 445
- 239000003546 flue gas Substances 0.000 title claims abstract description 363
- 229910002091 carbon monoxide Inorganic materials 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000006243 chemical reaction Methods 0.000 claims abstract description 109
- 239000003426 co-catalyst Substances 0.000 claims abstract description 47
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 63
- 238000001514 detection method Methods 0.000 claims description 47
- 239000003054 catalyst Substances 0.000 claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000007254 oxidation reaction Methods 0.000 claims description 19
- 230000003197 catalytic effect Effects 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 12
- 239000002737 fuel gas Substances 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 11
- 229910002651 NO3 Inorganic materials 0.000 claims description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 22
- 239000000446 fuel Substances 0.000 abstract description 10
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract description 8
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002779 inactivation Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000011278 co-treatment Methods 0.000 description 7
- 229910052815 sulfur oxide Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 108010054147 Hemoglobins Proteins 0.000 description 2
- 102000001554 Hemoglobins Human genes 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 108010064719 Oxyhemoglobins Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000003710 cerebral cortex Anatomy 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002900 effect on cell Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000002973 irritant agent Substances 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the invention relates to a treatment system and a treatment method for flue gas purification, in particular to a system and method for flue gas decarbon monoxide and denitrification, and belongs to the technical field of chemical industry and environmental protection.
- flue gas denitration technology is a flue gas purification technology used in the chemical industry to generate multiple nitrogen oxides.
- Flue gas denitrification refers to reducing the generated NO x to N 2 to remove NO x in the flue gas. According to the treatment process, it can be divided into wet denitrification and dry denitrification.
- the flue gas denitration technology mainly includes dry method (selective catalytic reduction flue gas denitrification, selective non-catalytic reduction denitrification) and wet method.
- the main advantages of the dry flue gas denitrification technology are: low capital cost, simple process and equipment, NO X removal efficiency is also high, no waste water and waste treatment, easy to cause Secondary pollution.
- Selective catalytic reduction SCR denitration is to use ammonia, CO or hydrocarbons as a reducing agent in the presence of a catalyst to reduce NO in the flue gas to N 2 in the presence of oxygen.
- SCR method denitrification generally the temperature is controlled at about 120-400°C.
- the flue gas to be processed is all produced by the combustion of fuel, and due to the sufficient degree of combustion and the fuel cannot be completely burned, the flue gas contains a certain amount of carbon monoxide.
- the flue gas to be treated is generally discharged directly after desulfurization and denitrification treatment.
- the carbon monoxide in the flue gas is not targeted for treatment and utilization, resulting in carbon monoxide. Direct emissions.
- carbon monoxide is a colorless, odorless, and non-irritating gas; it has very low solubility in water and is extremely difficult to dissolve in water; the explosion limit when mixed with air is 12.5%-74.2%; carbon monoxide is easily combined with hemoglobin to form carbon Oxyhemoglobin makes hemoglobin lose its ability to carry oxygen and cause tissue asphyxiation and death in severe cases; carbon monoxide has toxic effects on tissues and cells throughout the body, especially the cerebral cortex. Therefore, the direct emission of carbon monoxide is extremely harmful to the environment.
- this application proposes a system and method for flue gas denitration using carbon monoxide co-processing.
- carbon monoxide has particularly poor sulfur resistance at low temperatures, and when the system is turned on, the CO treatment device will always be in a low temperature state for a period of time. That is to say, when the system is cold-started, the catalyst in the CO treatment device is prone to be poisoned by sulfur oxides.
- the present invention proposes a flue gas decarbon monoxide and denitrification system and method.
- the present invention converts the carbon monoxide in the flue gas into carbon dioxide by using the carbon monoxide in the flue gas. The heat released during this process is directly used for heating up the flue gas, reducing or even saving the process of heating up the flue gas by external fuel heating.
- the CO reactor in the present invention includes a main reaction tower and a bypass. At the beginning of the system startup, the flue gas heated by the hot air generator is used to preheat the CO catalyst in the main reaction tower of the CO reactor, so as to well It solves the problem that the CO catalyst is prone to poisoning and failing due to the sulfur oxides in the flue gas during the cold start of the system.
- the present invention makes full use of the carbon monoxide in the flue gas, and uses the heat released during the process of converting the carbon monoxide into carbon dioxide to achieve the purpose of raising the flue gas temperature for denitration treatment, saving or even eliminating the use of fuel, and avoiding the low temperature of the CO catalyst When the state encounters sulfur oxides, it is easy to deactivate. At the same time, the carbon monoxide in the flue gas is treated, which reduces the pollution of the flue gas to the environment, and also reduces or even avoids the secondary pollution in the flue gas treatment process.
- a system for removing carbon monoxide and denitrification from flue gas is provided.
- a flue gas denitrification and carbon monoxide denitration system includes a hot air generating device, a CO reactor, and an SCR reactor.
- the CO reactor includes a main reaction tower and a bypass.
- the first pipe and the second pipe separated from the original flue gas conveying pipe are respectively connected to the main reaction tower and the bypass of the CO reactor.
- Both the third pipe leading from the flue gas outlet of the main reaction tower of the CO reactor and the fourth pipe leading from the bypass of the CO reactor are connected to the SCR reactor via the fifth pipe after being combined.
- the hot air outlet of the hot air generating device is connected to the first pipe via the sixth pipe.
- the system further includes a first valve arranged on the first pipe.
- the first valve is located upstream of the connection position between the sixth pipe and the first pipe.
- the system further includes a second valve arranged on the second pipeline.
- the system also includes a GGH heat exchanger.
- the original flue gas is connected to the flue gas inlet of the first heat exchange zone of the GGH heat exchanger through a pipe, the flue gas outlet of the first heat exchange zone of the GGH heat exchanger is connected to the original flue gas conveying pipe, and the clean smoke of the SCR reactor
- the gas outlet is connected to the second heat exchange zone of the GGH heat exchanger through a seventh pipe.
- the eighth pipe is separated from the sixth pipe and connected to the original flue gas conveying pipe.
- a third valve is provided on the sixth pipeline.
- the third valve is located downstream of the location of the eighth pipe on the sixth pipe.
- a fourth valve is provided on the eighth pipe.
- the system further includes a gas delivery pipe, which is connected to the gas supplement inlet of the hot air generating device.
- the system also includes a combustion-supporting gas delivery pipeline, which is connected to the supplementary inlet of the combustion-supporting gas of the hot air generating device.
- a flue gas flow detection device Preferably, a flue gas flow detection device, a CO concentration detection device, and a first temperature detection device are provided on the original flue gas transportation pipeline.
- the flue gas flow detection device, the CO concentration detection device, and the first temperature detection device are all located upstream of the connection position of the eighth pipe and the original flue gas conveying pipe.
- a second temperature detection device is provided on the side wall of the main reaction tower of the CO reactor.
- a third temperature detection device is provided on the fifth pipe close to the flue gas inlet of the SCR reactor.
- the flue gas outlet of the second heat exchange zone of the GGH heat exchanger is connected to the front end of the combustion-supporting gas delivery pipeline. That is, the net flue gas after denitration and heat exchange is used as the combustion-supporting gas, and the waste heat in the net flue gas is fully utilized.
- a method for removing carbon monoxide and denitrification from flue gas is provided.
- the hot air generated by the hot air generating device is passed into the main reaction tower of the CO reactor to preheat the CO catalyst in the main reaction tower, and the second temperature detection device is for the CO catalyst in the main reaction tower of the CO reactor
- the first valve is opened, the second valve is closed, and the hot air generator is shut down.
- the flue gas enters the main reaction tower of the CO reactor. Contact with the CO catalyst in the main reaction tower to generate CO catalytic oxidation reaction; the reaction heat released by the catalytic oxidation of CO heats the flue gas to obtain a heated flue gas G 2 containing nitrate;
- Nitrate-containing flue gas G 2 enters the SCR reactor for denitration through the fifth pipe, and the net flue gas after denitration is discharged from the net flue gas outlet of the SCR reactor.
- a method for removing carbon monoxide and denitrification from flue gas is provided.
- the hot air generated by the hot air generating device is passed into the main reaction tower of the CO reactor via the sixth pipe to preheat the CO catalyst in the main reaction tower, and the second temperature detection device measures the CO in the main reaction tower of the CO reactor. real-time monitoring of the temperature of the catalyst; CO catalyst when the detected temperature reaches the set temperature T 3 is the catalyst, the first valve is opened, closed second valve, while closing the third valve (fourth valve or closed), the flue gas enters the CO
- the main reaction tower of the reactor contacts with the CO catalyst in the main reaction tower to generate CO catalytic oxidation reaction; the reaction heat released by the catalytic oxidation of CO heats the flue gas, and the heated flue gas G 2 is obtained ;
- Nitrate-containing flue gas G 2 enters the SCR reactor for denitration through the fifth pipe, and the net flue gas after denitration enters the second heat exchange zone of the GGH heat exchanger and is discharged after heat exchange.
- the flow rate of the original flue gas G 1 per unit time is detected, which is marked as U 1 Nm 3 /h; the temperature of the original flue gas G 1 is detected, which is marked as T 1 °C; detect the content of CO in the original flue gas G 1 and mark it as P 1 g/Nm 3 ; calculate: the mass flow of carbon monoxide in the original flue gas G 1 per unit time is U 1 *P 1 g/h; the original smoke per unit time The heat released by the combustion of carbon monoxide in gas G 1 Q 1 kJ/h:
- a is the combustion coefficient, with a value of 0.1-1, preferably 0.4-0.95, more preferably 0.7-0.9;
- C is the average specific heat capacity of the flue gas, kJ/(°C ⁇ g);
- b is the heat transfer coefficient, with a value of 0.7-1, preferably 0.8-0.98, more preferably 0.9-0.95.
- the optimal denitration temperature of the SCR reactor is set to T denitration °C.
- T 2 T denitrification
- the carbon monoxide in the original flue gas G 1 enters the main reaction tower of the CO reactor for catalytic oxidation, and the heat released makes the nitrate- containing flue gas G 2 entering the SCR reactor reach T denitrification °C, and the flue gas Denitration treatment is carried out directly in the SCR reactor.
- T 2 ⁇ T denitration increase the amount of fuel gas and combustion-supporting gas in the hot air generator, so that the nitrogen-containing flue gas G 2 entering the SCR reactor reaches T denitration °C.
- T 2 > T denitrification reduce the amount of fuel gas and combustion-supporting gas in the hot air generator, so that the nitrogen-containing flue gas G 2 entering the SCR reactor reaches T denitrification °C. If the amount of gas and combustion-supporting gas of the hot blast generator is reduced until the hot blast generator is shut down, the temperature T 2 of the nitrate- containing flue gas G 2 is still greater than T for denitrification. At this time, the second valve is opened to make part of the original flue gas G 1 flow Through the bypass of the CO reactor; adjust the opening of the second valve so that the nitrogen-containing flue gas G 2 entering the SCR reactor is reduced to T denitration °C.
- the increase in the amount of gas used in the hot air generator is:
- e is the combustion coefficient, the value is 0.6-1, preferably 0.8-0.99, more preferably 0.8-0.98; that is to say, the hot air generator needs to supplement the gas with a flow rate of U 2 Nm 3 /h per unit time , So that the temperature of the flue gas before entering the SCR reactor reaches T denitration °C.
- the adjustment of the second valve at this time is specifically:
- the flue gas with a flow rate of U 3 Nm 3 /h needs to be reduced in the main reaction tower of the CO reactor; adjust the opening of the second valve to make the flue gas flow into the bypass of the CO reactor It is U 3 Nm 3 /h, so that the temperature of the flue gas before entering the SCR reactor drops to T denitration °C.
- the carbon monoxide in the flue gas is converted into carbon dioxide by passing the flue gas to be treated through a CO reactor, specifically:
- the use of carbon monoxide in the flue gas itself and the reaction of carbon monoxide with oxygen to generate carbon dioxide is an exothermic reaction.
- the carbon monoxide in the flue gas is converted into carbon dioxide through a CO reactor.
- the heat released by this reaction is used to raise the temperature.
- the flue gas is processed to realize the effect of heating up the flue gas; at the same time, the carbon monoxide in the flue gas is removed, and the pollution of the carbon monoxide in the flue gas to the environment is avoided.
- the flue gas to be treated often contains sulfur oxides and nitrogen oxides. It has been found that carbon monoxide has particularly poor sulfur resistance at low temperatures. In the actual production process, it takes a process to raise the temperature when the system is turned on, and the CO treatment device will always be in a low temperature state for a period of time. That is to say, when the system is turned on, if the flue gas directly enters the CO treatment device, the CO catalyst in the CO treatment device is easily poisoned and invalidated due to the low temperature and the sulfur oxides in the flue gas, and the CO catalyst is deactivated It is irreversible.
- the present invention designs the traditional CO treatment device as a structure including a main reaction tower and a bypass, and the main reaction tower is equipped with a CO catalyst.
- the flue gas does not pass through the main reaction tower of the CO reactor (that is, the CO treatment device), but enters the bypass of the CO reactor, and then is discharged after being denitrated by the SCR reactor.
- the hot air generating device is started, and the hot air generated by the hot air generating device is passed into the main reaction tower of the CO reactor to heat the CO catalyst in the main reaction tower.
- the set temperature of the CO catalyst (that is, the temperature to ensure that the CO catalyst will not deactivate) is related to the type of catalyst.
- the heating efficiency of the method of the present invention is higher.
- the original flue gas transmission pipeline is used to heat all the flue gas to be processed, and the amount of flue gas to be processed is large, so a large amount of fuel needs to be consumed to heat the flue gas to be processed.
- the present invention directly uses the hot air generated by the hot air generating device.
- the main reaction tower leading into the CO reactor directly acts on the CO catalyst, which greatly saves the use of fuel.
- this application considers using the heat released from the conversion of carbon monoxide in the flue gas to heat the flue gas.
- the present invention starts from the hot air generator
- the generated hot air is introduced into the original flue gas conveying pipe all the way to heat the flue gas in the original flue gas conveying pipe, so as to ensure that the flue gas can reach the appropriate denitration temperature of the SCR method before entering the SCR reactor.
- the flue gas decarbon monoxide denitration system includes a hot air generator, a CO reactor, and an SCR reactor.
- the CO in the flue gas is oxidized into carbon dioxide and releases heat.
- the heat released heats the flue gas, so that the flue gas reaches the temperature required for SCR denitrification, and then the flue gas enters the SCR reaction.
- the device performs denitration treatment.
- the CO reactor in the present invention includes a main reaction tower and a bypass, and the main reaction tower is provided with a CO catalyst.
- the hot air generating device in the present invention provides energy supplement for the CO reactor. At the beginning of the system startup, the hot air generated by the hot air generating device is used to heat the CO catalyst in the main reaction tower of the CO reactor to a set temperature.
- the hot air generator is started, and the hot air generated by the hot air generator enters the main CO reactor through the sixth pipe.
- the reaction tower preheats the CO catalyst in the main reaction tower.
- the first valve is closed and the second valve is opened.
- the original flue gas flows through the bypass of the CO reactor through the second pipe, and then enters the SCR reactor for denitration.
- the temperature of the CO catalyst in the main reaction tower reaches the catalyst set temperature T 3 (the second temperature detection device monitors the temperature of the CO catalyst in real time)
- the first valve is opened, the second valve is closed, and the hot air generator is turned off at the same time.
- the gas enters the main reaction tower of the CO reactor and contacts the CO catalyst to produce CO catalytic oxidation reaction.
- the heat released by the reaction heats the flue gas, and then the flue gas enters the SCR reactor for denitration.
- the present invention draws all the way from the hot air generated by the hot air generating device to heat the flue gas in the original flue gas conveying pipe. It is further ensured that the temperature of the flue gas can reach the normal operation requirement of the SCR catalyst before entering the SCR reactor.
- hot air is introduced to heat the flue gas in the original flue gas transmission pipeline, and the flue gas temperature increases, which can also prevent the flue gas from entering the main reaction tower of the CO reactor and deactivating the CO catalyst.
- the first valve is opened, the second valve is closed, and the third valve or the fourth valve is closed at the same time. Any one of the valves.
- the flue gas produced by the hot air generator is only used to heat the flue gas, and then the flue gas enters the main reaction tower of the CO reactor, and contacts the CO catalyst to cause the CO catalytic oxidation reaction. The heat released by the reaction The flue gas is heated, and then the flue gas enters the SCR reactor for denitration.
- the present invention also includes a GGH heat exchanger. Since the net flue gas after denitrification still has a relatively high temperature, the addition of the GGH heat exchanger can make good use of the waste heat of the net flue gas after denitration and realize resource recovery. This part of the waste heat is used to heat the original flue gas through the GGH heat exchanger, and the temperature of the original flue gas is increased, thereby further ensuring the heating effect of the flue gas on the CO catalyst in the main reaction tower, and further ensuring that the CO catalyst will not encounter sulfur at low temperatures. Inactivation due to oxides. Moreover, the increase in the temperature of the original flue gas also makes it easier for the flue gas to reach the temperature required by the SCR method for denitrification before entering the SCR reactor.
- the content of CO in the original flue flow G 1, G 1 original flue temperature and the detected original flue pipes can be drawn flue gas mass flow rate G a primary carbon monoxide per unit time.
- G a primary carbon monoxide per unit time a*U 1 *P 1 *10.11.
- the combustion coefficient a is because it is difficult to achieve 100% conversion of carbon monoxide, which can be selected according to engineering experience, and the value is 0.1-1, preferably 0.4-0.95, and more preferably 0.7-0.9.
- U 1 is the flow rate of the original flue gas G 1 per unit time
- P 1 is the CO content in the original flue gas G 1. That is to say, through the technical solution of the present invention, the energy of Q 1 can be obtained by using carbon monoxide in the flue gas.
- the temperature T 1 °C of the original flue gas G 1 in the original flue gas conveying pipe is detected by the first temperature detection device, and the average specific heat capacity C, kJ/(°C ⁇ g) of the flue gas can be obtained through the instrument detection.
- the heat transfer coefficient b is because it is difficult for 100% of the heat released from the conversion of carbon monoxide to carbon dioxide to be absorbed by the original flue gas. It can be valued according to engineering experience.
- the value is 0.7-1, preferably 0.8-0.98, and more preferably 0.9-0.95. That is to say, through the technical scheme of the present invention, the temperature of the original flue gas can be increased from T 1 °C to T 2 °C by using carbon monoxide in the flue gas.
- the best (or most suitable) denitration temperature T denitration °C of the selected SCR reactor is known, that is, the best
- the temperature of the flue gas delivered to the SCR reactor is T denitration °C.
- the temperature of the nitrate- containing flue gas G 2 when it enters the SCR reactor is ensured, thereby ensuring the denitrification efficiency of the nitrate-containing flue gas in the SCR reactor, and removing nitrogen oxides in the flue gas as efficiently as possible. Reduce the content of pollutants in the exhausted flue gas, thereby reducing environmental pollution.
- T 2 T denitration
- the NOx- containing flue gas G 2 entering the SCR reactor can just reach T denitration °C, then the flue gas is directly in the SCR reactor Carry out denitration treatment.
- T 2 ⁇ T denitrification that is to say, the heat released by the conversion of carbon monoxide in the flue gas is not enough to make the NOx- containing flue gas G 2 entering the SCR reactor reach T denitrification °C
- additional adjustment means can be used to make SCR
- the nitrogen-containing flue gas G 2 in front of the reactor reaches T denitration °C, and then is sent to the SCR reactor.
- the additional adjustment means is to increase the amount of gas and combustion-supporting gas of the hot air generating device.
- the heat of combustion N 1 kJ/g of the gas can be known.
- the gas with a supplementary flow rate of U 2 Nm 3 /h can be determined.
- e is the combustion coefficient, because the fuel is difficult to achieve 100% combustion, and it is difficult to release 100% of the theoretical heat.
- the value can be selected according to engineering experience.
- the value is 0.6-1, preferably 0.8-0.99, and more preferably 0.8- 0.98. That is to say, the input gas is slightly excessive, so as to ensure that the temperature of the flue gas before entering the SCR reactor reaches T denitration °C.
- T 2 > T denitrification that is, by using the heat released from the conversion of carbon monoxide in the flue gas, it is sufficient to raise the NOx- containing flue gas G 2 before entering the SCR reactor to reach T denitrification °C, and there is a surplus of heat.
- the consumption of fuel gas and combustion-supporting gas of the hot air generator is reduced, so that the nitrogen-containing flue gas G 2 entering the SCR reactor reaches T denitration °C.
- the third temperature detection device monitors the temperature of the nitrogen-containing flue gas G 2 before entering the SCR reactor in real time. In the process of reducing the amount of fuel gas and combustion-supporting gas in the hot air generator, it is combined with the third temperature detection device to enter the SCR reactor The temperature of the previous nitrate-containing flue gas G 2 undergoes real-time feedback adjustment.
- the temperature T 2 of the nitrate- containing flue gas G 2 is still greater than T for denitrification.
- the second valve is opened to make part of the original flue gas G 1 flow
- the nitrogen-containing flue gas G 2 entering the SCR reactor is reduced to T denitration °C.
- the flue gas with a flow rate of U 3 Nm 3 /h needs to be reduced in the main reaction tower of the CO reactor; adjust the opening of the second valve to make the flue gas flow into the bypass of the CO reactor It is U 3 Nm 3 /h, so that the temperature of the flue gas before entering the SCR reactor drops to T denitration °C.
- the present invention has the following beneficial technical effects:
- the present invention converts the carbon monoxide in the flue gas into carbon dioxide by using the carbon monoxide in the flue gas, and the heat released during this process is directly used for heating up the flue gas, reducing or even saving the process of heating up the flue gas by external fuel heating;
- the CO reactor in the present invention includes a main reaction tower equipped with a CO catalyst and a bypass. At the beginning of the system startup, the hot air generated by the hot air generator is used to preheat the CO catalyst in the main reaction tower of the CO reactor , So as to avoid the problem that the CO catalyst encounters sulfur oxides in the flue gas when the system is cold started;
- the present invention treats carbon monoxide in the flue gas while denitrifying, reduces the pollution of the flue gas to the environment, and also weakens or even avoids secondary pollution in the flue gas treatment process.
- Figure 1 is a schematic diagram of the structure of a flue gas decarbon monoxide and denitrification system according to the present invention
- Figure 2 is a schematic diagram of the structure of the flue gas decarbon monoxide and denitrification system provided with a GGH heat exchanger;
- Figure 3 is a process flow diagram of a flue gas decarbon monoxide and denitrification method according to the present invention
- Figure 4 is a process flow diagram of another method for removing carbon monoxide and denitrification from flue gas according to the present invention.
- Hot air generator 2: CO reactor; 201: main reaction tower of CO reactor; 202: bypass of CO reactor; 3: SCR reactor; 4: GGH heat exchanger; 401: GGH heat exchanger 402: The second heat exchange area of the GGH heat exchanger; 5: Flue gas flow detection device; 6: CO concentration detection device; 7: First temperature detection device; 8: Second temperature detection device 9: the third temperature detection device; k1: the first valve; k2: the second valve; k3: the third valve; k4: the fourth valve;
- L0 the original flue gas transmission pipeline
- L1 the first pipeline
- L2 the second pipeline
- L3 the third pipeline
- L4 the fourth pipeline
- L5 the fifth pipeline
- L6 the sixth pipeline
- L7 the seventh pipeline
- L8 The eighth pipeline
- L9 Gas transmission pipeline
- L10 Combustion gas transmission pipeline.
- a system for removing carbon monoxide and denitrification from flue gas includes a hot air generating device 1, a CO reactor 2, and an SCR reactor 3.
- the CO reactor 2 includes a main reaction tower 201 and a bypass 202.
- the first pipe L1 and the second pipe L2 branched from the original flue gas conveying pipe L0 are respectively connected to the main reaction tower 201 and the bypass 202 of the CO reactor 2.
- the third pipe L3 from the flue gas outlet of the main reaction tower 201 of the CO reactor 2 and the fourth pipe L4 from the bypass 202 of the CO reactor 2 are both connected to the SCR reaction via the fifth pipe L5 after being combined. ⁇ 3.
- the hot air outlet of the hot air generating device 1 is connected to the first duct L1 via the sixth duct L6.
- the system further includes a first valve k1 arranged on the first pipe L1.
- the first valve k1 is located upstream of the connection position between the sixth pipe L6 and the first pipe L1.
- the system further includes a second valve k2 provided on the second pipe L2.
- the system also includes a GGH heat exchanger 4.
- the original flue gas is connected to the flue gas inlet of the first heat exchange zone 401 of the GGH heat exchanger 4 through a pipe, and the flue gas outlet of the first heat exchange zone 401 of the GGH heat exchanger 4 is connected to the original flue gas delivery pipe L0, SCR
- the net flue gas outlet of the reactor 3 is connected to the second heat exchange zone 402 of the GGH heat exchanger 4 through a seventh pipe L7.
- an eighth pipe L8 is branched from the sixth pipe L6 and connected to the original flue gas conveying pipe L0.
- a third valve k3 is provided on the sixth pipeline L6.
- the third valve k3 is located downstream of the position where the eighth pipe L8 branches off on the sixth pipe L6.
- a fourth valve k4 is provided on the eighth pipe L8.
- the system further includes a gas delivery pipe L9, which is connected to the gas supplement inlet of the hot air generator 1.
- the system further includes a combustion-supporting gas delivery pipeline L10, which is connected to the supplementary inlet of the combustion-supporting gas of the hot air generator 1.
- the original flue gas delivery pipe L0 is provided with a flue gas flow detection device 5, a CO concentration detection device 6, and a first temperature detection device 7.
- the flue gas flow detection device 5, the CO concentration detection device 6, and the first temperature detection device 7 are all located upstream of the connecting position of the eighth pipe L8 and the original flue gas conveying pipe L0.
- a second temperature detection device 8 is provided on the side wall of the main reaction tower 201 of the CO reactor 2.
- a third temperature detection device 9 is provided on the fifth pipe L5 and close to the flue gas inlet of the SCR reactor 3.
- the flue gas outlet of the second heat exchange zone 402 of the GGH heat exchanger 4 is connected to the front end of the combustion-supporting gas delivery pipe L10.
- a flue gas denitrification and carbon monoxide denitrification system includes a hot air generator 1, a CO reactor 2, and an SCR reactor 3.
- the CO reactor 2 includes a main reaction tower 201 and a bypass 202.
- the first pipe L1 and the second pipe L2 branched from the original flue gas conveying pipe L0 are respectively connected to the main reaction tower 201 and the bypass 202 of the CO reactor 2.
- the third pipe L3 from the flue gas outlet of the main reaction tower 201 of the CO reactor 2 and the fourth pipe L4 from the bypass 202 of the CO reactor 2 are both connected to the SCR reaction via the fifth pipe L5 after being combined. ⁇ 3.
- the hot air outlet of the hot air generating device 1 is connected to the first duct L1 via the sixth duct L6.
- the side wall of the main reaction tower 201 of the CO reactor 2 is provided with a second temperature detection device 8.
- Example 1 except that the system also includes a first valve k1 arranged on the first pipe L1.
- the first valve k1 is located upstream of the connection position between the sixth pipe L6 and the first pipe L1.
- the system also includes a second valve k2 provided on the second pipe L2.
- the system also includes a gas delivery pipe L9, which is connected to the gas supplement inlet of the hot air generating device 1.
- the system also includes a combustion-supporting gas delivery pipeline L10, which is connected to the supplementary inlet of the combustion-supporting gas of the hot air generator 1.
- Example 2 is repeated, except that the system also includes a GGH heat exchanger 4.
- the original flue gas is connected to the flue gas inlet of the first heat exchange zone 401 of the GGH heat exchanger 4 through a pipe, and the flue gas outlet of the first heat exchange zone 401 of the GGH heat exchanger 4 is connected to the original flue gas delivery pipe L0, SCR
- the net flue gas outlet of the reactor 3 is connected to the second heat exchange zone 402 of the GGH heat exchanger 4 through a seventh pipe L7.
- Example 3 except that the eighth pipe L8 is separated from the sixth pipe L6 and connected to the original flue gas delivery pipe L0.
- a third valve k3 is provided on the sixth pipeline L6.
- the third valve k3 is located downstream of the position where the eighth pipe L8 branches off on the sixth pipe L6.
- a fourth valve k4 is provided on the eighth pipe L8.
- Embodiment 4 is repeated, except that the original flue gas delivery pipe L0 is provided with a flue gas flow detection device 5, a CO concentration detection device 6, and a first temperature detection device 7.
- the flue gas flow detection device 5, the CO concentration detection device 6, and the first temperature detection device 7 are all located upstream of the connecting position of the eighth pipe L8 and the original flue gas conveying pipe L0.
- Example 5 is repeated, except that a third temperature detection device 9 is provided on the fifth pipe L5 near the flue gas inlet of the SCR reactor 3.
- Example 6 is repeated, except that the flue gas outlet of the second heat exchange zone 402 of the GGH heat exchanger 4 is connected to the front end of the combustion-supporting gas delivery pipe L10.
- a method for removing carbon monoxide and denitrification from flue gas includes the following steps:
- the reaction temperature of the main catalyst in the CO 201 real-time monitoring column; CO when the detected temperature of the catalyst to the catalyst 3 reaches the set temperature T, the first valve is opened k1, closes the second valve k2, while a hot air generator shut down,
- the flue gas enters the main reaction tower 201 of the CO reactor 2 and contacts with the CO catalyst in the main reaction tower 201 to generate CO catalytic oxidation reaction; the reaction heat released by the catalytic oxidation of CO heats the flue gas to obtain a heated nitrogen-containing flue gas G 2 ;
- a method for removing carbon monoxide and denitrification from flue gas includes the following steps:
- the hot air generated by the hot air generator 1 is led to the main reaction tower 201 of the CO reactor 2 via the sixth pipe L6 to preheat the CO catalyst in the main reaction tower 201, and the second temperature detection device 8 is used for the CO reactor 2 the reaction temperature of the main catalyst in the CO 201 real-time monitoring column; CO catalyst when the detected temperature reaches the set temperature of the catalyst T 3, the first valve is opened k1, K2 closes the second valve (fourth valve closed or k4) And the third valve k3, the flue gas enters the main reaction tower 201 of the CO reactor 2, and contacts with the CO catalyst in the main reaction tower 201 to cause CO catalytic oxidation reaction; the reaction heat released by the catalytic oxidation of CO heats the flue gas to obtain a heated Nitrogen-containing flue gas G 2 ;
- Nitrate-containing flue gas G 2 enters the SCR reactor 3 for denitration through the fifth pipe L5, and the net flue gas after denitration enters the second heat exchange zone 402 of the GGH heat exchanger 4 for heat exchange and is discharged.
- Example 8 or 9 except that in the process of implementing the flue gas decarbon monoxide and denitrification method of the present invention, the flow rate of the original flue gas G 1 per unit time is detected, which is marked as U 1 Nm 3 /h; the temperature of the original flue gas G 1 is detected , Marked as T 1 °C; to detect the CO content in the original flue gas G 1 , marked as P 1 g/Nm 3 .
- Q 1 a*U 1 *P 1 *10.11; where: a is the combustion coefficient, with a value of 0.1-1, preferably 0.4-0.95, more preferably 0.7-0.9; for example, 0.5, 0.6, 0.8, 0.85.
- C is the average specific heat capacity of the flue gas, kJ/(°C ⁇ g);
- b is the heat transfer coefficient, with a value of 0.7-1, preferably 0.8-0.98, more preferably 0.9-0.95; for example, 0.75, 0.8, 0.85 , 0.92.
- the optimal denitration temperature of the SCR reactor 3 is set to T denitration °C.
- T 2 T denitrification
- the carbon monoxide in the original flue gas G 1 enters the main reaction tower 201 of the CO reactor 2 for catalytic oxidation, and the heat released makes the nitrate- containing flue gas G 2 entering the SCR reactor 3 reach T denitrification °C.
- the flue gas is directly subjected to denitration treatment in the SCR reactor 3.
- T 2 ⁇ T denitration increase the amount of fuel gas and combustion-supporting gas of the hot air generator 1 so that the nitrate- containing flue gas G 2 entering the SCR reactor 3 reaches T denitration °C.
- T 2 > T denitrification by adjusting the amount of fuel gas and combustion-supporting gas of the hot air generator 1, the nitrate- containing flue gas G 2 entering the SCR reactor 3 reaches T denitrification °C. If the amount of gas and combustion-supporting gas of the hot air generator 1 is reduced until the hot air generator 1 is shut down, the temperature T 2 of the nitrate- containing flue gas G 2 is still greater than T for denitrification.
- the second valve k2 is opened to make part of the original flue gas G 1 flowing through the bypass CO 2 reactor 202; k2 adjusting the degree of opening of the second valve such that smoke entering the SCR reactor containing the gas G is lowered to T 2 °C 3 of denitration.
- Example 10 is repeated, except that if T 2 ⁇ T for denitration , the increase in the amount of gas used in the hot air generator 1 is:
- e is the combustion coefficient, with a value of 0.6-1, preferably 0.8-0.99, more preferably 0.8-0.98; for example, 0.75, 0.8, 0.85, 0.92, 0.98. That is to say, in unit time, the hot air generating device 1 needs to supplement the fuel gas with a flow rate of U 2 Nm 3 /h, so that the temperature of the flue gas before entering the SCR reactor 3 reaches T denitration °C.
- Example 10 is repeated, except that if the temperature T 2 of the nitrate- containing flue gas G 2 is still greater than T denitration after the hot air generator 1 is shut down, the adjustment of the second valve k2 at this time is specifically as follows:
- the flue gas with a flow rate of U 3 Nm 3 /h needs to be reduced in the main reaction tower 201 of the CO reactor 2; the opening of the second valve k2 is adjusted so that it enters the bypass 202 of the CO reactor 2.
- the flue gas flow rate inside is U 3 Nm 3 /h, so that the temperature of the flue gas before entering the SCR reactor 3 drops to T denitration °C.
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Abstract
Description
Claims (14)
- 一种烟气脱一氧化碳脱硝的系统,该系统包括热风发生装置(1)、CO反应器(2)、SCR反应器(3);CO反应器(2)包括主反应塔(201)和旁路(202);从原烟气输送管道(L0)分出的第一管道(L1)和第二管道(L2)分别连接至CO反应器(2)的主反应塔(201)和旁路(202);从CO反应器(2)的主反应塔(201)的烟气出口引出的第三管道(L3)和从CO反应器(2)的旁路(202)引出的第四管道(L4)两者在合并之后经由第五管道(L5)连接至SCR反应器(3);热风发生装置(1)的热风出口经由第六管道(L6)连接至第一管道(L1)。
- 根据权利要求1所述的系统,其特征在于:该系统还包括设置在第一管道(L1)上的第一阀门(k1);第一阀门(k1)位于第六管道(L6)与第一管道(L1)连接位置的上游;和/或该系统还包括设置在第二管道(L2)上的第二阀门(k2)。
- 根据权利要求1或2所述的系统,其特征在于:该系统还包括GGH换热器(4);原烟气通过管道连接至GGH换热器(4)的第一换热区(401)的烟气入口,GGH换热器(4)的第一换热区(401)的烟气出口与原烟气输送管道(L0)连接,SCR反应器(3)的净烟气出口通过第七管道(L7)连接至GGH换热器(4)的第二换热区(402)。
- 根据权利要求1-3中任一项所述的系统,其特征在于:从第六管道(L6)上分出第八管道(L8)连接至原烟气输送管道(L0)。
- 根据权利要求4所述的系统,其特征在于:第六管道(L6)上设有第三阀门(k3);第三阀门(k3)位于第六管道(L6)上分出第八管道(L8)位置的下游;和/或第八管道(L8)上设有第四阀门(k4)。
- 根据权利要求1-5中任一项所述的系统,其特征在于:该系统还包括燃气输送管道(L9),燃气输送管道(L9)连接至热风发生装置(1)的燃气补充入口;和/或该系统还包括助燃气体输送管道(L10),助燃气体输送管道(L10)连接 至热风发生装置(1)的助燃气体补充入口。
- 根据权利要求4-6中任一项所述的系统,其特征在于:原烟气输送管道(L0)上设有烟气流量检测装置(5)、CO浓度检测装置(6)、第一温度检测装置(7);烟气流量检测装置(5)、CO浓度检测装置(6)、第一温度检测装置(7)均位于第八管道(L8)与原烟气输送管道(L0)连接位置的上游;和/或CO反应器(2)的主反应塔(201)的侧壁上设有第二温度检测装置(8);和/或第五管道(L5)上且靠近SCR反应器(3)的烟气入口处设有第三温度检测装置(9)。
- 根据权利要求6或7所述的系统,其特征在于:GGH换热器(4)的第二换热区(402)的烟气出口连接至助燃气体输送管道(L10)的前端。
- 一种烟气脱一氧化碳脱硝的方法或使用权利要求1-8中任一项所述系统来控制烟气脱一氧化碳脱硝的方法,该方法包括以下步骤:1)关闭第一阀门(k1),打开第二阀门(k2),原烟气输送管道(L0)内通入原烟气G 1;2)原烟气G 1通过第二管道(L2)进入CO反应器(2)的旁路(202),然后烟气通过第五管道(L5)进入SCR反应器(3)脱硝,脱硝后的净烟气从SCR反应器(3)的净烟气出口排出;3)启动热风发生装置(1),热风发生装置(1)产生的热风通入CO反应器(2)的主反应塔(201),预热主反应塔(201)内的CO催化剂,第二温度检测装置(8)对CO反应器(2)的主反应塔(201)内的CO催化剂的温度进行实时监测;当检测到CO催化剂的温度达到催化剂设定温度T 3时,打开第一阀门(k1),关闭第二阀门(k2),同时关停热风发生装置(1),烟气进入CO反应器(2)的主反应塔(201),与主反应塔(201)内的CO催化剂接触发生CO催化氧化反应;CO催化氧化放出的反应热加热烟气,获得升温后的含硝烟气G 2;4)含硝烟气G 2通过第五管道(L5)进入SCR反应器(3)脱硝,脱硝后的净烟气从SCR反应器(3)的净烟气出口排出。
- 一种烟气脱一氧化碳脱硝的方法或使用权利要求1-8中任一项所述系统来控制烟气脱一氧化碳脱硝的方法,该方法包括以下步骤:1)关闭第一阀门(k1),打开第二阀门(k2),烟气通过GGH换热器(4)的第一换热区(401)换热后进入原烟气输送管道(L0),获得加热后的原烟气G 1;2)启动热风发生装置(1),打开第三阀门(k3)和第四阀门(k4),热风发生装置(1)产生的热风一路经由第八管道(L8)通入原烟气输送管道(L0),对原烟气输送管道(L0)内的烟气进行加热;加热后的烟气通过第二管道(L2)进入CO反应器(2)的旁路(202),然后烟气通过第五管道(L5)进入SCR反应器(3)脱硝,脱硝后的净烟气进入GGH换热器(4)的第二换热区(402)换热后排出;3)热风发生装置(1)产生的热风另一路经由第六管道(L6)通入CO反应器(2)的主反应塔(201),预热主反应塔(201)内的CO催化剂,第二温度检测装置(8)对CO反应器(2)的主反应塔(201)内的CO催化剂的温度进行实时监测;当检测到CO催化剂的温度达到催化剂设定温度T 3时,打开第一阀门(k1),关闭第二阀门(k2),同时关闭第三阀门(k3)(或关闭第四阀门(k4)),烟气进入CO反应器(2)的主反应塔(201),与主反应塔(201)内的CO催化剂接触发生CO催化氧化反应;CO催化氧化放出的反应热加热烟气,获得升温后的含硝烟气G 2;4)含硝烟气G 2通过第五管道(L5)进入SCR反应器(3)脱硝,脱硝后的净烟气进入GGH换热器(4)的第二换热区(402)换热后排出。
- 根据权利要求9或10所述的方法,其特征在于:检测单位时间内原烟气G 1的流量,标记为U 1Nm 3/h;检测原烟气G 1的温度,标记为T 1℃;检测原烟气G 1中CO的含量,标记为P 1g/Nm 3;计算:单位时间内原烟气G 1中一氧化碳的质量流量为U 1*P 1g/h;单位时间内原烟气G 1中一氧化碳燃烧放出的热量Q 1kJ/h:Q 1=a*U 1*P 1*10.11;其中:a为燃烧系数,取值为0.1-1,优选为0.4-0.95,更优选为0.7-0.9;计算原烟气G 1中的一氧化碳在CO反应器(2)的主反应塔(201)内转 化为二氧化碳后,含硝烟气G 2的温度T 2℃:其中:C为烟气的平均比热容,kJ/(℃﹒g);b为热传递系数,取值为0.7-1,优选为0.8-0.98,更优选为0.9-0.95。
- 根据权利要求11所述的方法,其特征在于:根据SCR反应器(3)的需要,设定SCR反应器(3)的最佳脱硝温度为T 脱硝℃;若T 2=T 脱硝,则原烟气G 1中的一氧化碳进入CO反应器(2)的主反应塔(201)催化氧化,放出的热量使得进入SCR反应器(3)的含硝烟气G 2达到T 脱硝℃,将该烟气直接在SCR反应器(3)进行脱硝处理;若T 2<T 脱硝,则增加热风发生装置(1)的燃气及助燃气体的用量,使得进入SCR反应器(3)的含硝烟气G 2达到T 脱硝℃;若T 2>T 脱硝,通过调小热风发生装置(1)的燃气及助燃气体的用量,使得进入SCR反应器(3)的含硝烟气G 2达到T 脱硝℃;若调小热风发生装置(1)的燃气及助燃气体的用量至关停热风发生装置(1)后,含硝烟气G 2的温度T 2仍大于T 脱硝,此时打开第二阀门(k2),使部分原烟气G 1流经CO反应器(2)的旁路(202);调节第二阀门(k2)的开度,使得进入SCR反应器(3)的含硝烟气G 2降低至T 脱硝℃。
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