CN107158907A - Oxidation plus wet absorption flue gas desulfurization and denitrification integral method and its device - Google Patents
Oxidation plus wet absorption flue gas desulfurization and denitrification integral method and its device Download PDFInfo
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- CN107158907A CN107158907A CN201710515457.XA CN201710515457A CN107158907A CN 107158907 A CN107158907 A CN 107158907A CN 201710515457 A CN201710515457 A CN 201710515457A CN 107158907 A CN107158907 A CN 107158907A
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- flue gas
- oxidation
- absorption tower
- waste heat
- gas desulfurization
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000003546 flue gas Substances 0.000 title claims abstract description 50
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 43
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 39
- 230000003647 oxidation Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 23
- 230000023556 desulfurization Effects 0.000 title claims abstract description 23
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011777 magnesium Substances 0.000 claims abstract description 31
- 239000002918 waste heat Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 21
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 17
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 13
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 13
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 8
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 7
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- 238000004537 pulping Methods 0.000 claims description 11
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 230000001172 regenerating effect Effects 0.000 claims description 10
- AQGDXJQRVOCUQX-UHFFFAOYSA-N N.[S] Chemical compound N.[S] AQGDXJQRVOCUQX-UHFFFAOYSA-N 0.000 claims description 7
- 239000005864 Sulphur Substances 0.000 claims description 4
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 4
- 229940095054 ammoniac Drugs 0.000 abstract description 4
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 abstract description 4
- 235000019341 magnesium sulphate Nutrition 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 239000003337 fertilizer Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 30
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 14
- 238000004939 coking Methods 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- NHYCGSASNAIGLD-UHFFFAOYSA-N Chlorine monoxide Chemical compound Cl[O] NHYCGSASNAIGLD-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011430 maximum method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009719 regenerative response Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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
- B01D53/75—Multi-step processes
-
- 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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to one kind oxidation plus wet absorption flue gas desulfurization and denitrification integral method and its device, flue gas is passed through waste heat boiler, then with ozone Oxidation Treatment, flue gas and absorbing liquid Mg (OH) after processing2Reaction generation MgSO4With Mg (NO3)2, remaining flue gas absorbs with hydrogen peroxide, then discharged by chimney；MgSO4With Mg (NO3)2The mixture of generation ammonium sulfate, ammonium nitrate and magnesium hydroxide is reacted with ammoniacal liquor, mixture is filtered, precipitated, blowback, ammonium sulfate, ammonium nitrate is separated with magnesium hydroxide, the magnesium hydroxide isolated is recycled as absorbing liquid.By pollutant SO2The agricultural fertilizer sulfate of ammoniac and nitric acid ammonia utilized is converted into NO, the product that making FFS systems does not have secondary pollution is produced, and makes the Mg (OH) of generation2(magnesium sulfate) recycles and greatlys save operating cost.
Description
Technical field
The present invention relates to steel, chemical industry, coking, petrochemical field inner flue gas pollutant NOx, SO2, dust field of purification,
Specifically a kind of oxidation plus wet absorption flue gas desulfurization and denitrification integral method and its device.
Background technology
FOA oxidation technologies：FOA oxidation technologies are need to remove component to be removed by method for oxidation.The technology of the present invention
It, by water insoluble NO, is NO with ozone oxidation to be by method for oxidation2Technology, and go to absorption tower and Mg (OH)2Carry out chemical suction
It is MgSO to receive reaction4It is removed.
It is comparative maturity to aoxidize FOA technologies, and it is by chlorine monoxid, hydrogen peroxide, and ozone is as oxidant, various oxidants,
It wants different medium with the conditions of with various oxidants, there is different oxygenation efficiency, that is, selective oxidation.
The content of the invention
The present invention is exactly to utilize NO (nitric oxide) and SO2(sulfur dioxide) is dry anti-with selectivity in the case of hygrometric state
It should be combined, and give optimization.We take following method：
(1) technical problem to be solved
1st, NO and ozone reaction are in 2~3 seconds, and in the case of dripless, and its reaction selectivity is significantly better than SO2, this
Invention will calculate the pipeline section distance in the space (drying) of oxidation reaction in the drying flow development length before absorption tower, make NO by
Calculate and require to carry out oxidation reaction, it is ensured that smoke stack emission is qualified.
2nd, under the conditions of wet drop, SO2With Mg (OH)2Absorbing reaction, compare NO2It is fast many, so there is SO2With NO2
High selectivity under the conditions of wet drop.The technology of the present invention utilizes SO2Classification absorption techniques is carried out in absorption tower with NO selectivity, and
And the pH value and gas liquid ratio (G/L) of optimization are calculated according to actual conditions, see (the FFS flue gas desulfurization and denitrification integral process of figure one
Flow chart).And current oxidation technology and alkaline process wet absorption technology, in order to ensure to discharge, flue gas is up to standard not to be controlled ozone, is adopted
Aoxidized with excess, and excessive oxidation absorption tower the first order by SO2SO is oxidized in the liquid state3, and SO2Can directly with
Mg(OH)2, it is absorbed as MgSO4, it is not necessary to reoxidize, so oxidation FOA had peroxidating originally, waste ozone, increase cost.
3rd, flue gas desulfurization and denitrification is a system, and he and original combustion system are an entirety, if desulphurization denitration is filled
Put and break down, pipeline scale is blocked or air-introduced machine disorderly closedown, because former flue gas is entered chimney stack by desulfuring and denitrifying apparatus
Gate valve, which is closed, to be drawn flue gas and enters desulfurizing tower absorption, if pipeline blocks up air-introduced machine Ting Zhuo into causing combustion system (burner hearth) pressure limit,
Flue gas can not be discharged, and caused and built the pressure and cause burner hearth Lighting-blast casualty, occur in several years ago coking desulfurization denitration project it is a lot of by
Cause coking basement flue Lighting-blast casualty, FFS systems hair of the present invention in coking desulfurization denitration pipeline scale and air-introduced machine parking
Understand flue pressure, air-introduced machine, the safety interlock system of failure.
4th, some combustion system smog discharge temperatures are more than 200 DEG C and desulfuring and denitrifying apparatus adaptive temperature is on 120 DEG C of left sides
The right side, so original technology has waste heat wasting.Effluent gas temperature and absorption tower humidity are optimized calculating by the present invention,
Make it is more than the acid dew point of flue gas ensure pipe-line equipment do not corrode in the case of or take key position anti-corrosion measure fully to reclaim cigarette
Gas energy.
The present invention is combustion system and flue gas desulfurization and denitrification, waste heat recovery, the technology of safeguard protection integral system.
Desulfurization and denitrification integral system FFS, it is to aoxidize FOA technologies and warm formula desulphurization denitration NO by flue gas composition2, de- NO3
FGD technologies, while by flue gas run safety interlocking, stop in emergency, waste heat recovery optimize combination as an integration
System system abbreviation：FFS.
(2) technical scheme：
Oxidation plus wet absorption flue gas desulfurization and denitrification integral method, are passed through waste heat boiler by flue gas, then use ozone oxygen
Change is handled, the flue gas after processing and absorbing liquid Mg (OH)2Reaction generation MgSO4With Mg (NO3)2, remaining flue gas inhaled with hydrogen peroxide
Receive, then discharged by chimney；
MgSO4With Mg (NO3)2The mixture of generation ammonium sulfate, ammonium nitrate and magnesium hydroxide is reacted with ammoniacal liquor, by mixture
Filtered, precipitated, blowback, ammonium sulfate, ammonium nitrate is separated with magnesium hydroxide, the magnesium hydroxide isolated is followed as absorbing liquid
Ring is utilized.
The flue gas of ozone Oxidation Treatment and absorbing liquid Mg (OH)2Gas liquid ratio (G/L) >=2.5, absorbing liquid Mg (OH)2PH
It is worth for 7.5.
Remaining flue gas and the gas liquid ratio (G/L) of hydrogen peroxide are 2, and the pH of hydrogen peroxide is 5-6.
One kind oxidation humidification absorbs flue gas desulfurization and denitrification integrated apparatus, including waste heat boiler, flue gas oxidation unit, desulfurization
Denitration absorption tower, ammonia process regenerating unit, filter separator, sulphur ammonia evaporator, Mg (OH)2Pulping device, hydrogen peroxide provide device；
The waste heat boiler is located at smoke inlet, and flue gas oxidation unit is arranged at waste heat boiler and desulphurization denitration absorption tower
Between；The desulphurization denitration absorption tower is sponge oil unit, the first order and Mg (OH)2Pulping device is connected, the second level with it is double
Oxygen water provides device and is connected；The bottom on desulphurization denitration absorption tower is connected with ammonia process regenerating unit, ammonia process regenerating unit and filtering point
From device be connected, filter separator respectively with sulphur ammonia evaporator and Mg (OH)2Pulping device is connected.
The waste heat boiler import installs two pressure transformers as two and takes the signal that a pressure is promptly interlocked, and and sound
Light alarm device is connected with safety interlock system, for controlling flue pressure.
Chimney is provided with the top of the desulphurization denitration absorption tower.
Electrostatic precipitator is provided with the desulphurization denitration absorption tower.
Brief description of the drawings：
Fig. 1 is FFS flue gas desulfurization and denitrification integral process flow charts (main equipment)；
Fig. 2 is that desulphurization denitration flue fuel gas is gone out safely in interlocking emergency stopping system；
Fig. 3 is desulphurization denitration flue fuel gas safety interlock system logic chart；
Wherein, waste heat boiler 1, flue gas oxidation unit 2, desulphurization denitration absorption tower 3, ammonia process regenerating unit 4, filter separator
5th, sulphur ammonia evaporator 6, Mg (OH)2Pulping device 7, hydrogen peroxide provide device 8, chimney 9, electrostatic precipitator 10, spiral board 13,001A
It is energy-storage type electric hydraulic control valve, fuel gas control valve API102 with 001B.
Embodiment
According to there is problem and the method for solution in above regular oxidation and absorbing reaction, patent of the present invention is exactly to solve
Method optimizes combination and reaches that denitrification efficiency is maximized, while to consumable material and maintenance and operating cost minimumization,
Regeneration is carried out to the magnesium sulfate of generation, by ammoniacal liquor and magnesium sulfate, the regenerative response of magnesium nitrate, generation sulfate of ammoniac and nitric acid
Ammonia product, by pollutant SO2The agricultural fertilizer sulfate of ammoniac and nitric acid ammonia utilized is converted into NO, system is not had the production of secondary pollution
Thing is produced, and makes the Mg (OH) of generation2(magnesium sulfate) recycles and greatlys save operating cost.
The present invention will be ozonized, and ozone optimal control, magnesia absorbs, and regeneration, waste heat recovery optimizes combination, entered
Row desulphurization denitration regeneration integration, and combination safety function module makes system operation more with function of recovering waste heat module
Safety, its economic benefit is better.
Embodiment 1：
(1) ozone oxidation optimizes
The NO and SO for the zoneofoxidation that flue gas is entered before tower2Constitute the SO of quality and air flue emission2With NO mass and national (
Fang Zhengfu) standard, which combines, sets up a mathematical modeling, controls ozone amount, is used as the out of stock optimization of prime.
(2) SO is utilized2In warm drop-wise state high selection feature, on absorption tower, import is according to SO2Maximum with NO treating capacities is special
Point, on absorption tower, the first order uses higher gas liquid ratio (G/L), controls more than 2.5, while to absorbing liquid Mg (OH)2's
PH value is controlled 7.5 or so, makes substantial amounts of SO2On absorption tower, the first order is just absorbed.
(3) using hydrogen peroxide to the absorption characteristic to NO, the absorption of the absorption tower second level is set up at absorption tower tail station, now cigarette
Gas major part SO2Absorbed, only the NO of surplus, now by absorbing liquid gas liquid ratio (G/L) control 2, by pH value control 7.0
(by hydrogen peroxide), the now NO of surplus and minimal amount of SO2Absorbed by hydrogen peroxide；With Mg (OH)2Reaction generation MgSO4With Mg
(NO3)2This knockdown desulphurization denitration technology makes the maximum method of desulfurization, out of stock efficiency；
(4) absorbing liquid is subjected to the MgSO after air oxidation generation4、Mg(NO3)2Regenerative response generation sulphur is carried out with ammoniacal liquor
Sour ammonium, ammonium nitrate, the mixture of magnesium hydroxide, mixture is filtered, precipitation, and blowback is by ammonium sulfate (ammonium nitrate) and hydrogen-oxygen
Change magnesium separation, the magnesium hydroxide isolated is recycled as absorbent, and sulfate of ammoniac, nitric acid ammonia are sold as agricultural fertilizer.
(5) desulphurization denitration flue gas safety interlocking emergency shutdown system
As seen from Figure 2, by former two flue hand-operated valves 001A and 001B for leading to smokestack when desulphurization denitration comes into operation
Close, the valve 002 for entering absorption tower and waste heat boiler is opened, the present invention is：
A) 001A and 001B hand-operated valve is changed to automatic quick action emergency valve, this two quick action emergency valves are electric current accumulation of energy
Formula executing agency, it is switched 5 times using accumulation of energy under power down mode, if valve can be automatically opened up by having a power failure, valve is fully closed extremely
Wide-open time was selected between 5 seconds~10 seconds.Safety interlocking valve is the intellectual valve with self-diagnostic function, once valve is sent out
Raw failure (in the quiescent state) can automatic forecasting police.
B) fuel gas control valve API102 is made into energy-storage type electric hydraulic control valves, its standard-sized sheet to fully closed time is 3 seconds, is not being had
Have under electricity condition, can close automatically it is more than fuel main valve sell through joint efforts valve when normal in fully closed or state of a control, once hair
Raw to have a power failure, air-introduced machine is shut down, and flue pressure is ultralow, after safety interlock system can first alarm, then automatic interlock is carried out, 5~10
It is quick in second to open 001A and 001B.
C) chimney stack controls flue pressure in normal state by suction, and when less than 120Pa, safety interlock system is simultaneously
Fuel gas control valve was closed within 3 seconds, fuel shutoff gas enters flue, prevent burner hearth from occurring to dodge quick-fried.
(6) flue-gas waste-heat boiler optimizes
Flue-gas waste-heat boiler and air-introduced machine constitute a residual neat recovering system, and waste heat boiler is by effluent gas temperature poor 100
Heating wheelization water DEG C utilized above is saturated vapor.Saturated vapour pressure is in 0.8MPa, and flow is in 5 tons/h or so (coking flues
Exemplified by) one 1,000,000 tons/year, it goes out 5 tons of vapour per hour for coke-oven plant, and 40,000 tons or so steam are gone out every year, and its economic benefit is annual
More than 600 ten thousand or so.Air-introduced machine is by controlling waste heat boiler inlet pressure to ensure flue pressure in normal condition.Air-introduced machine is controlled
Pressure enter in FFM safety interlock systems, once break down FFM systems can automatic forecasting police, and can stop in emergency.
Embodiment 2：
One kind oxidation humidification absorbs flue gas desulfurization and denitrification integrated apparatus, including waste heat boiler 1, flue gas oxidation unit 2, de-
Sulphur denitration absorption tower 3, ammonia process regenerating unit 4, filter separator 5, sulphur ammonia evaporator 6, Mg (OH)2Pulping device 7, dioxygen water extraction
For device 8, chimney/9；
The waste heat boiler 1 is located at smoke inlet, and flue gas oxidation unit 2 is arranged at waste heat boiler 1 and desulphurization denitration is inhaled
Between receipts tower 3；The desulphurization denitration absorption tower 3 is sponge oil unit, and the first order is connected with the pulping devices 7 of Mg (OH) 2, second
Level provides device with hydrogen peroxide；Mg(OH)2Pulping device 7 is connected with desulphurization denitration absorption tower 3, the bottom on desulphurization denitration absorption tower 3
Portion is connected with ammonia process regenerating unit 4, and ammonia process regenerating unit 4 is connected with filter separator 5, and filter separator 5 steams with sulphur ammonia respectively
Send out device 6 and Mg (OH)2Pulping device 7 is connected；
The import of waste heat boiler 1 installs two pressure transformers as two and takes the signal that a pressure is promptly interlocked, and with
Acoustic-optic alarm is connected with safety interlock system, for controlling flue pressure.
The top of desulphurization denitration absorption tower 3 is provided with chimney 9.
Electrostatic precipitator 10 is provided with the desulphurization denitration absorption tower 3.
Claims (7)
1. oxidation plus wet absorption flue gas desulfurization and denitrification integral method, it is characterised in that：Flue gas is passed through waste heat boiler, then
With ozone Oxidation Treatment, flue gas and absorbing liquid Mg (OH) after processing2Reaction generation MgSO4With Mg (NO3)2, remaining flue gas uses
Hydrogen peroxide absorbs, and is then discharged by chimney；
MgSO4With Mg (NO3)2The mixture of generation ammonium sulfate, ammonium nitrate and magnesium hydroxide is reacted with ammoniacal liquor, mixture is carried out
Filtering, precipitation, blowback, make ammonium sulfate, ammonium nitrate be separated with magnesium hydroxide, and the magnesium hydroxide isolated circulates profit as absorbing liquid
With.
2. oxidation according to claim 1 plus wet absorption flue gas desulfurization and denitrification integral method, it is characterised in that：Ozone
The flue gas of oxidation processes and absorbing liquid Mg (OH)2Gas liquid ratio (G/L) >=2.5, absorbing liquid Mg (OH)2PH value be 7.5.
3. oxidation according to claim 1 plus wet absorption flue gas desulfurization and denitrification integral method, it is characterised in that：It is remaining
Flue gas and the gas liquid ratio (G/L) of hydrogen peroxide be 2, the pH of hydrogen peroxide is 5-6.
4. one kind oxidation humidification absorbs flue gas desulfurization and denitrification integrated apparatus, it is characterised in that：Including waste heat boiler (1), flue gas
Oxidation unit (2), desulphurization denitration absorption tower (3), ammonia process regenerating unit (4), filter separator (5), sulphur ammonia evaporator (6), Mg
(OH)2Pulping device (7), hydrogen peroxide provide device (8)；
The waste heat boiler (1) is located at smoke inlet, and flue gas oxidation unit (2) is arranged at waste heat boiler (1) and desulphurization denitration
Between absorption tower (3)；The desulphurization denitration absorption tower (3) is sponge oil unit, the first order and Mg (OH)2Pulping device (8)
It is connected, the second level provides device (8) with hydrogen peroxide and is connected；The bottom on desulphurization denitration absorption tower (3) and ammonia process regenerating unit (4) phase
Even, ammonia process regenerating unit (4) is connected with filter separator (5), filter separator (5) respectively with sulphur ammonia evaporator (6) and Mg
(OH)2Pulping device (8) is connected.
5. oxidation humidification according to claim 4 absorbs flue gas desulfurization and denitrification integrated apparatus, it is characterised in that：
Waste heat boiler (1) import installs two pressure transformers as two and takes the signal that a pressure is promptly interlocked, and and sound
Light alarm device is connected with safety interlock system, for controlling flue pressure.
6. oxidation humidification according to claim 4 absorbs flue gas desulfurization and denitrification integrated apparatus, it is characterised in that：It is described de-
Chimney (9) is provided with the top of sulphur denitration absorption tower (3).
7. oxidation humidification according to claim 4 absorbs flue gas desulfurization and denitrification integrated apparatus, it is characterised in that：It is described de-
Electrostatic precipitator (10) is provided with sulphur denitration absorption tower (3).
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| CN113117485A (en) * | 2019-12-30 | 2021-07-16 | 中晶环境科技股份有限公司 | Method for desulfurization and denitrification by using ammonium bisulfite |
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Application publication date: 20170915 |