CN108568210A - Cooperate with the flue gas reheat eliminating white smoke technique and method of CO low-temperature denitrations - Google Patents
Cooperate with the flue gas reheat eliminating white smoke technique and method of CO low-temperature denitrations Download PDFInfo
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- CN108568210A CN108568210A CN201810319969.3A CN201810319969A CN108568210A CN 108568210 A CN108568210 A CN 108568210A CN 201810319969 A CN201810319969 A CN 201810319969A CN 108568210 A CN108568210 A CN 108568210A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/204—Carbon monoxide
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- 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
Abstract
The present invention provides a kind of technique and method of the flue gas reheat eliminating white smoke of collaboration CO low-temperature denitrations, on flue after the wet desulfuration tower, it is sequentially connected gas gas plate heat exchanger, flue gas heater and low-temperature denitration reactor, the low-temperature denitration reactor is rotary low-temperature denitration reactor or circulating fluid bed reactor, and the flue after the low-temperature denitration reactor is also connected with gas gas plate heat exchanger.By the way that flue gas reheat after desulfurizing tower to be eliminated to the big white cigarette phenomenon of chimney breast, and the removing of the nitrogen oxides in effluent under low temperature (130 DEG C 150 DEG C) is realized, reaches the ultra-clean discharge standard of nitrogen oxides.After whole set process is located at wet desulfuration tower, the sulphur inactivation of catalyst is avoided, step is simple and convenient to operate, is highly practical.
Description
Technical field
The invention belongs to flue gas reheat eliminating white smoke field, more particularly to a kind of flue gas reheat of collaboration CO low-temperature denitrations disappears white
Cigarette technique and method.
Background technology
GGH cancel after, wet flue gas is directly discharged into air from chimney after coal-burning power plant's wet desulphurization, when with the lower ring of temperature
Border air is in contact, and the temperature of flue gas reduces, and institute's containing water vapor supersaturation condensation, condensing water droplet generates refraction to light, dissipates
Penetrate, to make plume show white or canescence, be called " wet plume " (" the big white cigarette " that is commonly called as, " white plume ",
" coloured plume " etc.), influence the appearance of the city.Shanghai City, Tianjin, Zhejiang Province, the Shandong Province etc. in China have all put into effect related environmentally friendly political affairs
Plan, it is desirable that phenomena such as coal-burning power plant should take fibre selection and other effective measures to eliminate " gypsum rain ", " coloured plume ".According to
Principle, the technology path for eliminating big white cigarette include that flue gas reheat, flue gas condensing, flue gas reheat add condensation, wherein MGGH flue gases again
Hot method is technologies most common and that application achievement is most.
MGGH is water-borne formula flue gas heat-exchange unit, i.e., a pipe heat exchanger is increased separately desulfurizing tower is forward and backward, in Tube Sheet of Heat Exchanger
For mediation cycle water, recirculated water absorbs flue gas heat before desulfurizing tower in heat exchanger, discharge heat in heat exchanger after desulfurizing tower
Low-temperature flue gas after heating desulfurizing tower, flue-gas temperature is improved to 75-80 DEG C, big white cigarette phenomenon can be eliminated.But this mode by
In increasing two-stage heat exchange, flue gas resistance can be greatly increased, increases air-introduced machine and contributes；Make heat exchange medium using water, reduces and change
The hot temperature difference increases heat exchange area and equipment volume under identical heat exchange amount, needs the place space for having enough at desulfurizing tower；And it drops
It can make acid cure knot in flue gas before low desulfurizing tower below flue-gas temperature to acid dew point, increase the risk of equipment corrosion.
Coal-burning power plant of China Air Pollutant Emission limit value requires the concentration of emission of nitrogen oxides to control in minimum discharge
50mg/m3, using ammonia as the selective catalysis reduction technique (NH of reducing agent3- SCR) it is to apply most, the most ripe and most have in the world
The gas denitrifying technology of effect, denitration efficiency is high, and mature and reliable is adaptable, and particularly suitable coal quality is changeable, unit load becomes
It moves frequently and to being used on the coal unit in the more sensitive region of air quality requirements.But SCR technology is due to using penetrating
Ammonia is reducing agent, corrosion can be generated to pipeline, control is improper easily to be made the escaping of ammonia generate secondary pollution and cause air preheater
It blocks；The catalyst used is mostly vanadium Titanium series catalyst, and bio-toxicity is higher to have larger threat to ecological environment, and is poisoned
It is difficult to regenerate after inactivation.
The blast furnace gas of steel plant contains a large amount of CO, and using CO as the NO_x Reduction by Effective of reducing agent, denitration is of low cost, does not give birth to
At other harmful components, temperature and component to flue gas it is adaptable, be particularly suitable for power plant, iron and steel metallurgical industry etc. with carbon object
Matter is the industrial trade of fuel.
Invention content
In order to overcome above-mentioned deficiency, the present invention provide a kind of flue gas reheat eliminating white smoke of collaboration CO low-temperature denitrations technique and
Method, the big white cigarette phenomenon of chimney breast is eliminated by flue gas reheat, and realizes the flue gas under low temperature (130 DEG C -150 DEG C)
The removing of middle nitrogen oxides reaches the ultra-clean discharge standard of nitrogen oxides.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of flue gas reheat eliminating white smoke system of collaboration CO low-temperature denitrations, the system comprises：Wet desulfuration tower, gas-gas
Plate heat exchanger, flue gas heater, rotary low-temperature denitration reactor；On flue after the wet desulfuration tower, connect successively
Connect-gas-gas plate heat exchanger, flue gas heater and rotary low-temperature denitration reactor, the rotary low-temperature denitration reactor
Flue afterwards is also connected with gas-gas plate heat exchanger.
The catalyst of rotary low-temperature denitration reactor is using non-precious metal catalysts such as Fe or Cu in the application, therefore,
In order to avoid sulfur-containing smoke gas leads to catalyst poisoning, in the application by the setting of rotary low-temperature denitration reactor desulfurizer it
Afterwards；Meanwhile by rotary low-temperature denitration reactor discharge flue gas can also in gas-gas plate heat exchanger with the flue gas after desulfurization
It exchanges heat, realizes the reheating eliminating white smoke of wet flue gas and making full use of for high-temperature flue gas thermal energy after wet desulphurization.
Preferably, the rotary low-temperature denitration reactor is a kind of swinging HC-SCR Benitration reactors
CN103908892A or circulating fluid bed reactor.
Preferably, the rotary low-temperature denitration reactor is divided into nitrogen oxide absorbent area 4-1 and the reducing zones CO 4-2, institute
It states circulating fluid bed reactor and is divided into rising area and descending area.
The present invention also provides a kind of coal-burning power plants, especially suitable for the exhaust treatment system of steel plant, including any one
The system.
Existing swinging HC-SCR Benitration reactors use methane (CH4), ethane (C2H6), ethylene (C2H4), propane
(C3H8), propylene (C3H6), butane (C4H10), butylene (C4H8) etc. a series of hydrocarbon (CnHm) the combination of one or several
As reducing agent, but the application research is found：When handling the tail gas of steel plant using the system of the application, due in such tail gas
Reducing agent, which is can be used as, containing more CO, CO effectively improves this system denitration efficiency.
The present invention also provides a kind of methods of the flue gas reheat eliminating white smoke of collaboration CO low-temperature denitrations, including：
By the flue gas after wet desulphurization after the heat exchange of gas-gas plate heat exchanger, 130 DEG C -150 is heated to through flue gas heater
℃；
Flue gas after heating is imported into rotary low-temperature denitration reactor and carries out low-temperature denitration；
By the flue gas after low-temperature denitration after the heat exchange of gas-gas plate heat exchanger, discharge.
Preferably, the flue-gas temperature after the wet desulphurization is 50-60 DEG C.
Preferably, temperature of the flue gas after the wet desulphurization after the heat exchange of gas-gas plate heat exchanger is 100-120 DEG C.
Preferably, the temperature of the low-temperature denitration is 130-150 DEG C.
Preferably, temperature of the flue gas after the low-temperature denitration after the heat exchange of gas-gas plate heat exchanger is 70-80 DEG C.
Preferably, the heat source of the heater is from 150 DEG C or more of high-temperature-hot-water, extracted steam from turbine or combustion gas.
Beneficial effects of the present invention
(1) pass through flue gas reheat, flue gas is heated to 70-80 DEG C of discharge by 50-60 DEG C after wet desulfuration tower, eliminates white
Cigarette；
(2) NO is aoxidized and is attached to catalyst surface in the adsorption zone of low-temperature denitration reactor, flue gas, in reducing zone,
NOxN is reduced to by CO2, catalyst recycling, nitrogen oxides in effluent is removed, and reaches ultra-clean discharge standard；
(3) after denitrification apparatus is located at desulfurization, the sulphur inactivation of catalyst is avoided, catalyst life is improved；
(4) the method for the present invention is simple, denitration efficiency is high, eliminates white cigarette after flue gas reheat, highly practical, easy to spread.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 cooperates with the flue gas reheat eliminating white smoke technique of CO low-temperature denitrations, wherein：1- wet desulfuration towers；2- gas-gas is board-like to change
Hot device；3- flue gas heaters；4- low-temperature denitration reactors；4-1：Adsorption zone；4-2：Reducing zone.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
With reference to specific embodiment, the present invention is described further.
A kind of technique and method of the flue gas reheat eliminating white smoke of collaboration CO low-temperature denitrations, chimney is eliminated by flue gas reheat
The big white cigarette phenomenon of outlet, and the removing of the nitrogen oxides in effluent under low temperature (130 DEG C -150 DEG C) is realized, reach nitrogen oxidation
The ultra-clean discharge standard of object.
Technique：On flue after wet desulfuration tower 1, it is sequentially connected gas-gas plate heat exchanger 2, flue gas heater 3 and rotation
Rotatable low-temperature denitration reactor 4, low-temperature denitration reactor 4 divide for nitrogen oxide absorbent area 4-1 and the reducing zones CO 4-2.Air-introduced machine
Flue gas in rear pass is entered by the smoke inlet of wet desulfuration tower 1, and the oxysulfide in flue gas is removed by wet desulphurization, from
The exhanst gas outlet of wet desulfuration tower 1 enters gas-gas plate heat exchanger 2, system rigid operation phase, the heat of gas-gas plate heat exchanger 2
Source is heated to 100-120 DEG C from about 130 DEG C of flue gas, by the wet flue gas after desulfurization, and 100-120 DEG C of flue gas enters flue gas and adds
Hot device 3 is further heated to 130-150 DEG C, and heat source is from 150 DEG C or more of high-temperature-hot-water, extracted steam from turbine or combustion
Gas, 130-150 DEG C of flue gas enter the adsorption zone 4-1 of low-temperature denitration reactor 4, best anti-due to low-temperature denitration reactor 4
It is 130 DEG C -150 DEG C to answer temperature, and flue gas is in adsorption zone 4-1 and O2Reaction, reaction product are attracted to catalyst surface, work as catalysis
Agent is rotated to reducing zone 4-2, CO is reduced to N by nitrogen oxides2, catalyst activity it is unaffected.Low-temperature denitration reactor 4 goes out
The flue gas of 130-150 DEG C of mouth enters gas-gas plate heat exchanger 2, heats the wet flue gas after desulfurization as heat source, itself is down to 70-
80 DEG C exclude from chimney.In the system operation stage, it is no longer necessary to which the additional flue gas for extracting 130 DEG C, external source are only for adding
150 DEG C or more of heat source of heat smoke heater.
Embodiment 1
On flue after coal-burning power plant's wet desulfuration tower 1, it is sequentially connected gas-gas plate heat exchanger 2, flue gas heater 3
And rotary low-temperature denitration reactor 4, low-temperature denitration reactor 4 divides for nitrogen oxide absorbent area 4-1 and the reducing zones CO 4-2.Draw
Flue gas in wind turbine rear pass is entered by the smoke inlet of wet desulfuration tower 1, and removing the sulphur in flue gas by wet desulphurization aoxidizes
Object enters gas-gas plate heat exchanger 2, system rigid operation phase, gas-gas plate heat exchanger from the exhanst gas outlet of wet desulfuration tower 1
2 heat source is heated to 100-120 DEG C from 130 DEG C of flue gas, by the wet flue gas after desulfurization, and 100-120 DEG C of flue gas enters cigarette
Hot-air heater 3 is further heated to 130-150 DEG C, heat source from 150 DEG C of high-temperature-hot-water, extracted steam from turbine or combustion gas,
130-150 DEG C of flue gas enters the adsorption zone 4-1 of low-temperature denitration reactor 4, due to the optimum response temperature of low-temperature denitration reactor 4
Degree is 130 DEG C -150 DEG C, and flue gas is in adsorption zone 4-1 and O2Reaction, reaction product are attracted to catalyst surface, when catalyst revolves
Reducing zone 4-2 is gone to, nitrogen oxides is reduced to N by CO2, catalyst activity it is unaffected.Low-temperature denitration reactor 4 exports
130 DEG C of flue gas enters gas-gas plate heat exchanger 2, as heat source heat desulfurization after wet flue gas, itself be down to 70-80 DEG C from
Chimney excludes.In the system operation stage, it is no longer necessary to which the additional flue gas for extracting 130 DEG C, external source are only for heating flue gas
150 DEG C or more of heat source of heater.
Embodiment 2
On flue after coal-burning power plant's wet desulfuration tower 1, it is sequentially connected gas-gas plate heat exchanger 2, flue gas heater 3
And circulating fluid bed reactor 4, circulating fluid bed reactor 4 are divided to for two regions in rising area and descending area, the interior loading catalysis of bed
Agent bed material, bed material are recycled in rising area and descending area.Flue gas in air-introduced machine rear pass by wet desulfuration tower 1 smoke inlet into
Enter, removes the oxysulfide in flue gas by wet desulphurization, enter gas-gas plate-type heat-exchange from the exhanst gas outlet of wet desulfuration tower 1
The heat source of device 2, system rigid operation phase, gas-gas plate heat exchanger 2 heats the wet flue gas after desulfurization from 130 DEG C of flue gas
To 100-120 DEG C, 100-120 DEG C of flue gas enters flue gas heater 3 and is further heated to 130-150 DEG C, and heat source comes from 150
DEG C high-temperature-hot-water, extracted steam from turbine or combustion gas, 130-150 DEG C of flue gas enters the descending area of circulating fluid bed reactor,
Since the optimal reaction temperature of circulating fluid bed reactor is 130 DEG C -150 DEG C, flue gas is in descending area and O2Reaction, reaction product
It is attracted to catalyst surface, when catalyst circulation enters rising area, nitrogen oxides is reduced to N by CO2, the activity of catalyst is not
It is impacted.The flue gas that circulating fluid bed reactor exports 130 DEG C enters gas-gas plate heat exchanger 2, after heating desulfurization as heat source
Wet flue gas, itself be down to 70-80 DEG C from chimney exclude.In the system operation stage, it is no longer necessary to the additional cigarette for extracting 130 DEG C
Gas, external source are only 150 DEG C or more of the heat source for heating flue gas heater.
Finally it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not limited to this hair
It is bright, although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still
It can modify to the technical solution recorded in previous embodiment, or equivalent replacement is carried out to which part.It is all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to the scope of the present invention
Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not required to
Make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of flue gas reheat eliminating white smoke system of collaboration CO low-temperature denitrations, which is characterized in that the system comprises：Wet desulphurization
Tower, gas-gas plate heat exchanger, flue gas heater, low-temperature denitration reactor；On flue after the wet desulfuration tower, successively
Connect gas-gas plate heat exchanger, flue gas heater and low-temperature denitration reactor, the flue after the low-temperature denitration reactor also with
Gas-gas plate heat exchanger is connected.
2. the system as claimed in claim 1, which is characterized in that the low-temperature denitration reactor is de- for a kind of swinging HC-SCR
Nitre reactor CN103908892A or circulating fluid bed reactor.
3. the system as claimed in claim 1, which is characterized in that the rotary low-temperature denitration reactor is divided into nitrogen oxides suction
Attached area 4-1 and the reducing zones CO 4-2, the circulating fluid bed reactor are divided into rising area and descending area.
4. one kind being used for coal-burning power plant, it is more suitable for the exhaust treatment system of steel plant, which is characterized in that including claim 1-
3 any one of them systems.
5. a kind of method of the flue gas reheat eliminating white smoke of collaboration CO low-temperature denitrations, which is characterized in that including：
By the flue gas after wet desulphurization after the heat exchange of gas-gas plate heat exchanger, heated device is heated to 130 DEG C -150 DEG C；
Flue gas after heating is imported into rotary low-temperature denitration reactor and carries out low-temperature denitration；
Flue gas after low-temperature denitration is discharged after the heat exchange of gas-gas plate heat exchanger, eliminates white cigarette.
6. method as claimed in claim 5, which is characterized in that the flue-gas temperature after the wet desulphurization is 50-60 DEG C.
7. method as claimed in claim 5, which is characterized in that the flue gas after the wet desulphurization is through gas-gas plate heat exchanger
Temperature after heat exchange is 100-120 DEG C.
8. method as claimed in claim 5, which is characterized in that the temperature of the low-temperature denitration is 130-150 DEG C.
9. method as claimed in claim 5, which is characterized in that the flue gas after the low-temperature denitration is through gas-gas plate heat exchanger
Temperature after heat exchange is 70-80 DEG C.
10. method as claimed in claim 5, which is characterized in that the heat source of the heater is from 150 DEG C or more of high temperature
Hot water, extracted steam from turbine or combustion gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319969.3A CN108568210B (en) | 2018-04-11 | 2018-04-11 | Smoke reheating white smoke eliminating process and method for cooperating with CO low-temperature denitration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319969.3A CN108568210B (en) | 2018-04-11 | 2018-04-11 | Smoke reheating white smoke eliminating process and method for cooperating with CO low-temperature denitration |
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| CN109519952A (en) * | 2018-12-12 | 2019-03-26 | 河南心连心化肥有限公司 | A kind of device and plume removal methods of the removing of boiler chimney plume |
| CN109899824A (en) * | 2019-02-22 | 2019-06-18 | 桐昆集团浙江恒盛化纤有限公司 | A kind of wet desulphurization takes off white integrative chimney |
| CN114321954A (en) * | 2021-12-24 | 2022-04-12 | 山东大学 | Heating furnace regenerative catalytic reduction denitration system and method |
| WO2023231175A1 (en) * | 2022-05-30 | 2023-12-07 | 中国科学院过程工程研究所 | Device system and method having sintering flue gas co catalytic heat exchange and medium-and-low-temperature scr denitration connected in series |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519952A (en) * | 2018-12-12 | 2019-03-26 | 河南心连心化肥有限公司 | A kind of device and plume removal methods of the removing of boiler chimney plume |
| CN109899824A (en) * | 2019-02-22 | 2019-06-18 | 桐昆集团浙江恒盛化纤有限公司 | A kind of wet desulphurization takes off white integrative chimney |
| CN114321954A (en) * | 2021-12-24 | 2022-04-12 | 山东大学 | Heating furnace regenerative catalytic reduction denitration system and method |
| WO2023231175A1 (en) * | 2022-05-30 | 2023-12-07 | 中国科学院过程工程研究所 | Device system and method having sintering flue gas co catalytic heat exchange and medium-and-low-temperature scr denitration connected in series |
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| Publication number | Publication date |
|---|---|
| CN108568210B (en) | 2021-02-09 |
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