CN103768932A - Flue gas denitration process for CO exhaust-heat boiler of FCC apparatus - Google Patents
Flue gas denitration process for CO exhaust-heat boiler of FCC apparatus Download PDFInfo
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- CN103768932A CN103768932A CN201210404194.2A CN201210404194A CN103768932A CN 103768932 A CN103768932 A CN 103768932A CN 201210404194 A CN201210404194 A CN 201210404194A CN 103768932 A CN103768932 A CN 103768932A
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Abstract
The invention discloses a flue gas denitration process for a CO exhaust-heat boiler of an FCC apparatus. Flue gas produced by an FCC regenerator is dedusted by a deduster, and before entering the CO exhaust-heat boiler, a cloud of flue gas is led out and used as a diluent gas for ammonia gas; and the flow of the diluent gas is 0.1 v%-5.0 v% of that of the original regeneration flue gas. The rest of the flue gas has energy recovered by a flue gas turbine, and is sent into the CO exhaust-heat boiler. The upper part of a high temperature evaporation section of the CO exhaust-heat boiler is provided with an ammonia injection grid, and an SCR denitration catalyst module is arranged between a low temperature evaporation segment and a high temperature economizer. The process provided by the invention uses FCC regeneration flue gas as the diluent gas for ammonia gas to dilute and carry the ammonia at the same time, so as to improve the mixing effect of ammonia gas and flue gas, not increase the rate of oxygen content rate of the CO exhaust-heat boiler, and avoid security risks; at the same time CO removal, waste heat recovery and denitrification of flue gas are accomplished in the CO exhaust-heat boiler, thereby omitting a separate SCR denitration reactor.
Description
Technical field
The present invention relates to the improvement method of catalytic cracking (FCC) regenerated flue gas, particularly relate to SCR (SCR) denitrating technique of oil plant FCC apparatus regenerated flue gas processing.
Background technology
Nitrogen oxide is generically and collectively referred to as NOx, is one of primary pollution source of atmosphere pollution.Harm maximum mainly: NO, NO
2.The main harm of NOx is as follows: (1) is to the toxic effect of human body; (2) to the toxic effect of plant; (3) can form acid rain, acid mist; (4) form photochemical fog with hydrocarbon; (5) damage the ozone layer.
At oil plant, in FCC (fluid catalytic cracking) technique, catalyst granules is iterative cycles between catalytic cracking zone and catalyst regeneration region, at regeneration period, the coke from cracking reaction on catalyst granules is at high temperature removed by air oxidation, the removal of deposits of coke makes the activation recovering of catalyst, and can be utilized in cracking reaction again.
Main 3 kinds of NOx, (1) the temperature mode NOx(THermol NOx of generating in combustion process): airborne nitrogen is at high temperature oxidized the NOx of generation.(2) Quick-type NOx(Promot NOx): hydrocarbon fuel air coefficient little (hydrocarbon fuel overrich) in the situation that, in flame sharply generate a large amount of NOx.(3) fuel type NOx(Fuel NOx): the NOx that the nitrogen-containing compound in fuel generates in combustion process.
NO and NO in the flue gas of catalytic cracked regenerated generation
2all have, but the research of thermodynamics and kinetics shows, mainly generate NO, in total NOx, NO accounts for 90v%, NO
2account for 10v%.The flue gas that NOx in FCC flue gas almost all produces from the nitrogenous coke burning on catalyst.Therefore due to the regeneration of catalyst, can there is the emission problem of NOx in the FCCU of all processing nitrogen-containing materials.At oil plant, FCCU is maximum NOx emission source.
For controlling NOx discharge, formulate each class standard abroad.EPA and 13 oil refining enterprise have signed pollutant control agreement (Consent Decree), and European Union requires all oil plants to carry out " comprehensive pollution and control guide ", and Japan has formulated the discharge standard of the NOx of FCCU." atmosphere comprehensive pollution thing discharge standard-GB16297-1996 " and " emission standard of air pollutants for boilers-GWPB3-1999 " that China formulates all restrict the discharge of NOx.Along with the increasingly stringent of environmental regulation, NOx discharge index is required to improve thereupon.Therefore, instant stage has been arrived in NOx pollution control.
Gas denitrifying technology mainly contains at present: the SCR (selective catalytic reduction) of gas-phase reaction and SNCR (SNCR method), liquid absorption method, solid absorption method, high energy electron active oxidation method (EBA electron beam irradiation method and PPCP impulse electric corona plasma method) etc.
In numerous denitrating flue gas treatment technologies, liquid absorption method denitration efficiency is low; Absorption method denitration efficiency is high, but adsorbance is little, and regeneration is frequent, applies not extensive; High energy electron active oxidation method is desulphurization denitration simultaneously, but energy consumption is high, and the life-span is short; The escapement ratio of SNCR method ammonia is high, can produce safety problem.
SCR technology, compared with other technologies, has denitration efficiency high, and the advantages such as technology maturation are that at present domestic and international Flue Gas Denitrification Engineering is applied maximum technology.SCR method refers to 200 ~ 400 ℃ of reaction temperatures, uses NH
3making reducing agent is N by NOx catalytic reduction
2, the oxygen in waste gas is seldom participated in reaction, and thermal discharge is little.
The combustion-type CO waste heat boiler of heavy oil catalytically cracking equipment configuration, mainly to utilize CO that the high temperature regeneration fume afterheat that produces in catalytic cracking (FCC) device production process and regenerator burn generation to press superheated steam in producing, CO in flue gas is burnt, and make CO discharge meet environmental requirement.
Regenerated flue gas adds air and fuel to burn after entering boiler, and object is CO and other nuisance of removing in regenerated flue gas, reclaims and adds the heat energy that fuel gas buring CO produces; Another main application of waste heat boiler is: in the time of catalytic unit disastershutdown, by fuel oil output steam, play the effect of power boiler, the needs that regulate to meet full factory steam load.
CO waste heat boiler is mostly π shape structure, and burner hearth is adiabatic furnace structure, is provided with oil gas associating nozzles in stove, and fuel is fuel oil or high pressure gas.The regenerated flue gas of heavy oil catalytically cracking equipment is successively by after the heating surface equipment heat-obtainings such as combustion chamber, high low temperature superheat section, high low temperature convection current evaporator section, high low-level (stack-gas) economizer section, and flue gas is discharged by back-end ductwork.
The regenerated flue gas of conventional catalytic cracking unit (FCCU) flows to: FCC regenerator → flue gas turbine expander → waste heat boiler → air preheater → desulfurization unit → chimney.
In CO waste heat boiler, the flow direction of flue gas is: outside combustion chamber → hyperthermia and superheating section → cryogenic overheating section → high temperature evaporation section → low-temperature evaporation section → high-temperature economizer → low-level (stack-gas) economizer → stove.
CN200920204676.7 discloses a kind of SCR equipment for denitrifying flue gas, comprise that catalytic reactor, ammonia/air mixer, ammonia spray barrier, air preheater, one entrance and the dilution air pipe of described ammonia/air mixer connect, and another entry sequence pipe of described ammonia/air mixer is connected to ammonia dashpot, ammonia evaporator, liquefied ammonia storage tank.CN200610044991.9 discloses a kind of high dirt composite SCR smoke denitrating technique and denitration catalyst reaction unit, the flue gas that contains nitrogen oxide NOx being transported by flue gas generation systems enters disk annular ammonia through controlled choke apparatus and sprays grid and mix with the ammonia that sprays grid nozzle ejection by disk annular ammonia, and described ammonia is pumped to ammonia-spraying grid by ammonia with the air that air blower is carried after ammonia blender mixes.Said method all adopts air as ammonia carrier gas, and carrier gas needs special dilution air, has increased energy consumption and equipment; And carrier gas oxygen content is larger, after mixing with ammonia, enter CO waste heat boiler, may affect the normal operation of boiler.
CN201010513397.6 discloses a kind of flue gas desulfurization device and method of float glass exhaust-heat boiler, this method is provided with SCR denitrification apparatus in the centre position of waste heat boiler inside, the flue-gas temperature of denitrification apparatus is controlled between 310～400 ℃, and sprays into ammonia to SCR denitrification apparatus.The method has realized SCR denitration catalyst reaction member has been arranged to waste heat boiler inside, the floor space that reduced equipment number of units, but be only that SCR denitration catalyst reaction member is arranged to waste heat boiler inside, 300～400 ℃ of temperature ranges position and other boiler in CO waste heat boiler is not quite similar, the consideration of relative position of therefore spraying ammonia position and SCR denitration catalyst reaction member is quite important, directly affects the denitration effect of flue gas; And above-mentioned patent does not consider how to spray into ammonia, meet ammonia and flue gas mixed effect does not have again potential safety hazard; Do not consider to control the problem of boiler containing oxygen rate simultaneously, as boiler raises containing oxygen rate, likely cause boiler efficiency to decline yet.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of flue-gas denitration process of FCC apparatus CO waste heat boiler.Process using FCC regenerated flue gas of the present invention is as the carrier gas of ammonia, both ammonia played to dilution and rolling action, improved the mixed effect of ammonia and flue gas, and that does not improve again CO exhaust-heat boiler flue gas contains oxygen rate, there is no potential safety hazard; The present invention simultaneously arranges ammonia-spraying grid and SCR denitrification catalyst module in the inner suitable position of CO waste heat boiler, completes and remove CO, waste heat recovery and denitrating flue gas function in a reactor, saves independent SCR Benitration reactor.
The flue-gas denitration process of FCC apparatus CO waste heat boiler of the present invention, comprise successively FCC regenerator, deduster, flue gas turbine expander, CO waste heat boiler, air preheater, desulfurization and dedusting unit and chimney according to flow of flue gas direction, the flue gas that FCC regenerator produces is after deduster dedusting, before entering CO waste heat boiler, draw the carrier gas of one flue gas as ammonia, carrier gas flow is the 0.1v%～5.0v% of former regenerated flue gas flow; All the other flue gases are after flue gas turbine expander recovers energy, send into CO waste heat boiler, described CO waste heat boiler comprises hyperthermia and superheating section, cryogenic overheating section, high temperature evaporation section, low-temperature evaporation section, high-temperature economizer and low-level (stack-gas) economizer, wherein on high temperature evaporation section top, ammonia-spraying grid is set, the temperature in this region is 400～650 ℃, and SCR denitrification catalyst module is set between low-temperature evaporation section and high-temperature economizer.
In the present invention, the oxygen concentration of carrier gas is 0.1v%～5.0v%, and temperature is 450～650 ℃, and pressure is 0.1～0.33MPa, and CO concentration is 0.1v%～10v%.
In the present invention, deduster preferably adopts cyclone dust collectors, and the extraction location of carrier gas is three to revolve or four outlets of revolving deduster.
In the present invention, ammonia evaporates liquefied ammonia generation by outer for steam in evaporimeter, and ammonia can not be carried at pipeline separately, need to add carrier gas.For avoiding explosion limit, the concentration after ammonia dilution is not more than 5v%.Carrier gas both played dilution and rolling action to ammonia, do not improve again CO exhaust-heat boiler flue gas containing oxygen rate; CO concentration and oxygen concentration can not affect boiler efficiency and qualified discharge.
In the present invention, after carrier gas mixes with ammonia, spraying into CO waste heat boiler by ammonia-spraying grid mixes with flue gas, expulsion pressure is not less than 0.1MPa, jet velocity reaches 10～15m/s, much larger than expulsion pressure 1～4kPa, the jet velocity 4～5m/s of the ammonia-spraying grid of other denitrating technique, improve the mixed effect of ammonia and flue gas.
In the present invention, be provided with the heat-exchange finned tube of 4～10m at the high and low temperature evaporator section of CO waste heat boiler.Ammonia and flue gas can make full use of these heat-exchange finned tubes, reach well-mixed effect, are beneficial to next step catalytic-reduction denitrified reaction at SCR denitrification catalyst module, do not need to arrange separately special ammonia/flue gas blender.
In the present invention, the grey grid of gear and ash discharging hole are set on SCR denitrification catalyst module top, the gradient of keeping off grey grid is 5 °～50 °.The fragment that CO waste heat boiler heat-insulation layer drops is kept off grey grid and separates from ash discharging hole and discharge from evaporator section exit with big dust particle in flue gas, avoid the big dust particle blocking catalyst that drops, and guarantees denitrating catalyst denitration rate and service life.
In the present invention, flue gas, after keeping off grey barrier dedusting, enters SCR denitrification catalyst module, and flue-gas temperature is 300～400 ℃, and ammonia reacts with NOx in flue gas and generates N
2and H
2o.Denitrification catalyst module is arranged on CO waste heat boiler inside, has so just saved independent SCR Benitration reactor, has reduced equipment number of units and floor space.
In the present invention, denitrating catalyst is that active component is coated in the honeycomb catalyst on honeycomb support, and aperture is 1～10mm, and active component is transition metal oxide.Active component is specially the oxide of V, oxide, the oxide of W and the oxide of Mo of Ti, and it is as follows that active component is counted honeycomb substrate quality with oxide: V(0.1wt%～4wt%), Ti(1wt%～90wt%), W(1wt%～15wt%) and Mo(0.1wt%～10wt%).
In the present invention, the flue gas after denitration is discharged by exhanst gas outlet through economizer, then enters air preheater, desulfurization and dedusting unit, discharges finally by chimney.
The present invention has following beneficial effect: (1) adopts the carrier gas of FCC regenerated flue gas as ammonia, both ammonia is played to dilution and rolling action, has improved again the mixed effect of ammonia and flue gas, has improved denitration rate, and there is no potential safety hazard; (2) regenerated flue gas containing oxygen rate far below air, can not cause CO waste heat boiler containing the rising of oxygen rate as carrier gas, do not affect the normal operation of CO waste heat boiler; (3) the CO waste heat boiler of SCR denitrification catalyst module and FCC apparatus is combined into the novel C O waste heat boiler with denitration function, the function of the recovery waste heat of existing waste heat boiler, the denitration function that has again SCR Benitration reactor, has reduced equipment number of units and floor space; (4) ammonia-spraying grid and denitrification catalyst module are separately positioned on evaporator section upper and lower, and dilution ammonia and flue gas, through the heat-exchange finned tube of 4～10m, can be realized abundant mixing, are beneficial to catalytic-reduction denitrified reaction.
Accompanying drawing explanation
Fig. 1 is the process unit flow chart of the flue-gas denitration process of FCC apparatus CO waste heat boiler of the present invention.
Wherein: 1, FCC regenerator, 2, deduster, 3, flue gas turbine expander, 4, CO waste heat boiler, 5, air preheater, 6, desulfurization and dedusting unit, 7, chimney, 8, liquefied ammonia or ammoniacal liquor, 9, evaporimeter, 10, steam; A, hyperthermia and superheating section, b, cryogenic overheating section, c, high temperature evaporation section, d, low-temperature evaporation section, e, SCR denitrification catalyst module, f, high-temperature economizer, g, low-level (stack-gas) economizer, h, keep off grey grid and ash discharging hole, i, ammonia-spraying grid.
Fig. 2 is the process unit flow chart of comparative example of the present invention.
Wherein: 11, FCC regenerator, 12, deduster, 13, flue gas turbine expander, 14, CO waste heat boiler, 15, SCR Benitration reactor, 16, air preheater, 17, desulfurization and dedusting unit, 18, chimney, 19, blower fan, 20, evaporimeter, 21, steam, 22, liquefied ammonia or ammoniacal liquor, j, ammonia-spraying grid.
The specific embodiment
Below by specific embodiment, FCC denitration method for flue gas of the present invention is elaborated.In the present invention, v% is volume fraction, wt% mass fraction.
Denitrating technique flow process shown in Figure 1, the regenerated flue gas that FCC regenerator 1 produces, flow is 120,000 Nm
3/ h, oxygen concentration is 2.3v%, and temperature is 610 ℃, and pressure is 0.33MPa, and CO concentration is 6v%.
Regenerated flue gas, after cyclone dust collectors 2 are removed the dust that is greater than 10mm, separates one flow and is the flue gas of 1.25v% of former regenerated flue gas flow as ammonia carrier gas, and temperature is 610 ℃, and pressure is 0.33MPa.All the other flue gases, after flue gas turbine expander 3 recovers energy, are sent into CO waste heat boiler 4.
Liquefied ammonia 8 enters evaporimeter 9 and is evaporated to ammonia, flow 48Nm by outer for steam 10
3the ammonia of/h and 1500Nm
3after/h carrier gas mixes, concentration is 3.0v% left and right.Carrier gas both played dilution and rolling action to ammonia, do not improve again CO exhaust-heat boiler flue gas containing oxygen rate..
CO waste heat boiler comprises hyperthermia and superheating section a, cryogenic overheating section b, high temperature evaporation section c, low-temperature evaporation section d, high-temperature economizer f and low-level (stack-gas) economizer g, wherein on high temperature evaporation section c top, ammonia-spraying grid i is set, the temperature in this region is 610 ℃, and SCR denitrification catalyst module e is set between low-temperature evaporation section d and high-temperature economizer f.The heat-exchange finned tube that is provided with 6m at the high temperature evaporation section c of CO waste heat boiler and low-temperature evaporation section d, ammonia and flue gas can make full use of these heat-exchange finned tubes, reach well-mixed effect.
After ammonia mixes with carrier gas, spray in CO waste heat boiler by the ammonia-spraying grid i arranging in CO waste heat boiler, expulsion pressure is 0.33MPa, and jet velocity reaches 15m/s.Spray into after CO waste heat boiler, flue gas fully mixes at high temperature evaporation section c and low-temperature evaporation section d.The gradient arranging before mixed flue gas arrival SCR denitrification catalyst module is the gear ash barrier h of 30 °, and the dust removing and fragment are regularly discharged CO waste heat boiler by ash discharging hole.Arrive afterwards SCR denitrification catalyst module e, the operating temperature of catalyst reaction is 350 ℃, the NOx in flue gas and NH
3carry out denitration reaction, generate N
2and H
2o.
The excellent specific properties such as catalyst adopts honeycomb, and it is large that this structure has active area, and anti-obstruction is resistance to poisoning, aging, catalyst is divided into 3 ~ 6 layers, and wherein 1 layer is set to reserved layer, is convenient to change and add catalyst.Denitrating catalyst is that active component is coated in the denitrating catalyst on honeycomb support, aperture is 5mm, active component is transition metal oxide, be specially the oxide of V, oxide, the oxide of W and the oxide of Mo of Ti, count honeycomb substrate quality with oxide as follows: V:2wt%, Ti:90wt%, W:7wt% and Mo:0.5wt%, this catalyst has good catalytic activity to SCR denitration reaction.
Flue gas after denitration is discharged by exhanst gas outlet through high-temperature economizer f and low-level (stack-gas) economizer g, enters successively air preheater 5, desulfurization and dedusting unit 6, and the flue gas after denitration desulfurization and dedusting enters atmosphere from chimney 7.
The denitrating technique route that adopts the inventive method, CO waste heat boiler import NOx is 432mg/Nm
3, outlet NOx is 40mg/Nm
3, NOx clearance is 91.2wt%.
Comparative example 1
Denitrating technique flow process shown in Figure 2, processes the FCC regenerated flue gas identical with embodiment 1.
Use blower fan 19 to carry 1500Nm
3the air of/h is as ammonia carrier gas, and the pressure of carrier gas is 3kPa, and temperature is normal temperature.
The flue gas that FCC regenerator 11 produces is removed after the dust that is greater than 10mm in deduster 12, after entering flue gas turbine expander 13 and recovering energy, sends into CO waste heat boiler 14.
Regenerated flue gas after flue gas turbine expander 13 recovers energy enters after CO waste heat boiler 14, adds fuel and combustion air to burn CO, and CO is converted into CO
2.The flue gas out of CO waste heat boiler 14 enters the SCR Benitration reactor 15 of independent setting, and the dilution ammonia spraying into ammonia-spraying grid j mixes.
Liquefied ammonia 22 enters evaporimeter 20 and is evaporated to ammonia by steam 21, flow 48Nm
3the ammonia of/h and 1500Nm
3after/h air mixes, the ammonia-spraying grid i arranging by SCR reactor sprays into, and fully mixes with regenerated flue gas.The fashionable expulsion pressure of diluted ammonia gas blowout is 3kPa, and jet velocity reaches 5m/s.NOx in flue gas and NH
3carry out denitration reaction, generate N
2and H
2o.
In SCR Benitration reactor, the operating temperature of catalytic reaction is 350 ℃, and catalyst adopts honeycomb, and it is large that this structure has active area, anti-obstruction, resistance to poisoning, the excellent specific property such as aging, catalyst is divided into 3 ~ 6 layers, and wherein 1 layer is set to reserved layer, is convenient to change and add catalyst.Denitrating catalyst is that active component is coated in the denitrating catalyst on honeycomb support, and aperture is 5mm.Active component is transition metal oxide, be specially the oxide of V, oxide, the oxide of W and the oxide of Mo of Ti, count honeycomb substrate quality with oxide as follows: V:2wt%, Ti:90wt%, W:7wt% and Mo:0.5wt%, reaction has good catalytic activity to this catalyst to SCR.
Flue gas after denitration is discharged through the outlet of SCR Benitration reactor, enters successively air preheater 16, desulfurization and dedusting unit 17, and the flue gas after denitration desulfurization and dedusting enters atmosphere from chimney 18.
The method of denitration route that adopts comparative example, CO waste heat boiler import NOx is 434mg/Nm
3, the NOx of SCR Benitration reactor outlet is 88mg/Nm
3, NOx clearance is 79.7wt%.Because gas speed is low, it is slightly poor that dilution ammonia enters the effect that boiler mixes with flue gas, therefore denitration rate deficiency 80wt%.
Claims (10)
1. the flue-gas denitration process of a FCC apparatus CO waste heat boiler, comprise successively FCC regenerator, deduster, flue gas turbine expander, CO waste heat boiler, air preheater, desulfurization and dedusting unit and chimney according to flow of flue gas direction, the flue gas that FCC regenerator produces is after deduster dedusting, before entering CO waste heat boiler, draw the carrier gas of one flue gas as ammonia, carrier gas flow is the 0.1v%～5.0v% of former regenerated flue gas flow; All the other flue gases are after flue gas turbine expander recovers energy, send into CO waste heat boiler, described CO waste heat boiler comprises hyperthermia and superheating section, cryogenic overheating section, high temperature evaporation section, low-temperature evaporation section, high-temperature economizer and low-level (stack-gas) economizer, wherein on high temperature evaporation section top, ammonia-spraying grid is set, the temperature in this region is 400～650 ℃, and SCR denitrification catalyst module is set between low-temperature evaporation section and high-temperature economizer.
2. according to flue-gas denitration process claimed in claim 1, it is characterized in that: the oxygen concentration of carrier gas is 0.1v%～5.0v%, temperature is 450～650 ℃, and pressure is 0.1～0.33MPa, and CO concentration is 0.1v%～10v%.
3. according to flue-gas denitration process claimed in claim 1, it is characterized in that: deduster adopts cyclone dust collectors, the extraction location of carrier gas is three to revolve or four outlets of revolving deduster.
4. according to flue-gas denitration process claimed in claim 1, it is characterized in that: ammonia evaporates liquefied ammonia generation by outer for steam in evaporimeter, and the concentration after ammonia dilution is not more than 5v%.
5. according to flue-gas denitration process claimed in claim 1, it is characterized in that: the expulsion pressure of ammonia-spraying grid is not less than 0.1MPa, and jet velocity reaches 10～15m/s.
6. according to flue-gas denitration process claimed in claim 1, it is characterized in that: the heat-exchange finned tube that 4～10m is set at the evaporator section of CO waste heat boiler.
7. according to flue-gas denitration process claimed in claim 1, it is characterized in that: the grey grid of gear and ash discharging hole are set on SCR denitrification catalyst module top, and the gradient of keeping off grey grid is 5 °～50 °.
8. according to flue-gas denitration process claimed in claim 7, it is characterized in that: flue gas, after keeping off grey barrier dedusting, enters SCR denitrification catalyst module, flue-gas temperature is 300～400 ℃.
9. according to flue-gas denitration process claimed in claim 1, it is characterized in that: SCR denitrating catalyst is that active component is coated in the honeycomb catalyst on honeycomb support, and aperture is 1～10mm, and active component is transition metal oxide.
10. according to flue-gas denitration process claimed in claim 1, it is characterized in that: the flue gas after denitration is discharged by exhanst gas outlet through economizer, then enters air preheater, desulfurization and dedusting unit, discharges finally by chimney.
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| CN106765246A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of method and device of online removing refinery FCC apparatus waste heat boiler fouling |
| CN112107993A (en) * | 2019-06-21 | 2020-12-22 | 中国石化工程建设有限公司 | Denitration method and system for flue gas of incomplete regeneration catalytic cracking device |
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| CN112107993A (en) * | 2019-06-21 | 2020-12-22 | 中国石化工程建设有限公司 | Denitration method and system for flue gas of incomplete regeneration catalytic cracking device |
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| CN103768932B (en) | 2016-02-03 |
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