CN111054201A - Development of desulfurization, denitrification and dust removal integrated technology - Google Patents
Development of desulfurization, denitrification and dust removal integrated technology Download PDFInfo
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- CN111054201A CN111054201A CN202010022931.7A CN202010022931A CN111054201A CN 111054201 A CN111054201 A CN 111054201A CN 202010022931 A CN202010022931 A CN 202010022931A CN 111054201 A CN111054201 A CN 111054201A
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- denitrification
- desulfurization
- dust removal
- boiler
- flue gas
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- 239000000428 dust Substances 0.000 title claims abstract description 60
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 42
- 230000023556 desulfurization Effects 0.000 title claims abstract description 42
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 230000003647 oxidation Effects 0.000 claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000004913 activation Effects 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 16
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims abstract description 13
- 229960002218 sodium chlorite Drugs 0.000 claims abstract description 12
- 239000003595 mist Substances 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 9
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 230000036632 reaction speed Effects 0.000 claims description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000004071 soot Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 13
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 12
- 229910052815 sulfur oxide Inorganic materials 0.000 description 8
- 230000010354 integration Effects 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 3
- 235000010261 calcium sulphite Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910017464 nitrogen compound Inorganic materials 0.000 description 3
- 150000002830 nitrogen compounds Chemical class 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- KIZFHUJKFSNWKO-UHFFFAOYSA-M calcium monohydroxide Chemical compound [Ca]O KIZFHUJKFSNWKO-UHFFFAOYSA-M 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
-
- 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
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a development of a desulfurization, denitrification and dust removal integrated technology, which adopts the following main equipment and combination mode, wherein the main equipment comprises a coal-fired boiler, a bag-type dust remover, a main induced draft fan, a sodium chlorite storage tank, a sodium sulfite delivery pump, a denitrification oxidation activation device, a desulfurization, denitrification and dust removal integrated tower, a super dust and mist removal device, an online monitor, a direct exhaust chimney, a low-oxygen combustion circulating fan, a boiler furnace and a boiler blower, and is combined by a specific process equipment combination mode, 99.9% or more of dust removed by the bag-type dust remover device is pressurized by the induced draft fan and then enters the specially designed denitrification oxidation activation device, more than 95% of NO is converted into high-valent nitrogen and then enters the desulfurization, denitrification and dust removal integrated device, the desulfurized and denitrified flue gas is discharged by the direct exhaust chimney after being subjected to super dust removal and mist removal at, realizing ultra-low emission and being beneficial to environmental protection.
Description
Technical Field
The invention relates to the technical field of desulfurization, denitrification and dust removal, in particular to development of a desulfurization, denitrification and dust removal integrated technology.
Background
Various boilers or industrial kiln flue gas denitration in service generally adopt SNCR + SCR combination denitration mode at present, this kind of denitration mode is owing to receive the limitation of temperature, denitration efficiency is hardly stabilized in certain scope, and the reductant generally is ammonia (amine) base for leading in addition, especially ammonia (or aqueous ammonia) bring certain potential safety hazard in transportation storage and management, SCR denitration catalyst's use also has certain cycle, can produce solid waste during the change, the regeneration treatment degree of difficulty is big, and the change expense is high.
Reform transform SCR denitrification facility on original boiler, because the selection of temperature window, often reform transform boiler afterbody flue gas pressurized element, not only waste time and energy, influence boiler thermal efficiency and safe in utilization simultaneously.
And part of the smoke of the boiler or the industrial kiln adopts an ozone oxidation process, so that the sealing performance is required to be extremely high for preventing ozone from leaking, and meanwhile, the power consumption is extremely high during ozone production, and the comprehensive operation cost is high.
The flue gas of the biomass combustion boiler contains a certain amount of alkaline metals such as sodium, potassium and the like in the biomass combustion process, and the alkaline metal substances are poisons of the titanium-based catalyst of the SCR denitration device and can poison the titanium-based catalyst to lose activity, so that the flue gas denitration of the biomass combustion boiler at home and abroad is not successful by using the titanium-based SCR denitration device.
Part of boiler or industrial kiln flue gas denitration adopts an ammonia (amine) based SNCR non-selective reduction catalyst method for denitration: the temperature of a hearth is required to be about 800-1050 ℃ to play a role, and when the boiler is influenced by factors such as furnace starting, furnace stopping, over-high or over-low load operation, fuel heat value and the like, the denitration is worse due to the temperature fluctuation. Sometimes, in order to forcedly pursue the denitration efficiency of the ammonia (amine) based SNCR non-selective reduction catalyst method in the boiler, a large amount of ammonia (amine) based denitration reducing agent is often used, so that the ammonia escape detail is increased, the corrosion to a tail device and a pressed element of boiler flue gas is aggravated, the service life is influenced, the safety is threatened, and the environment is more polluted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the development of a desulfurization, denitrification and dedusting integrated technology, and solves the problems.
In order to achieve the purpose, the invention is realized by the following technical scheme: the development of a desulfurization, denitrification and dust removal integrated technology adopts the following main equipment and combination modes:
the main equipment comprises a coal-fired boiler, a bag-type dust collector, a main induced draft fan, a sodium chlorite storage tank, a sodium sulfite delivery pump, a denitration oxidation activation device, a desulfurization, denitration and dust removal integrated tower, a super dust and mist removal device, an online monitor, a direct exhaust chimney, a low-oxygen combustion circulating fan, a boiler furnace and a boiler blower;
the process equipment adopts the following combination mode:
boiler furnace is located coal fired boiler's bottom, boiler blower's export is passed through the pipeline and is connected with boiler furnace, the gas outlet at coal fired boiler top passes through the entry linkage of pipeline and sack cleaner, the exit of sack cleaner passes through the pipeline and denitration oxidation activation device's entry linkage, denitration oxidation activation device's gas outlet passes through the entry linkage of pipeline and desulfurization denitration dust removal integration tower, the exit of desulfurization denitration dust removal integration tower passes through the entry linkage of pipeline and super dust removal defogging device, the exit of super dust removal defogging device passes through the pipeline and the entry linkage of direct vent chimney, the exit port of low oxygen combustion circulating fan passes through the entry linkage of pipeline and boiler blower, the entry of low oxygen combustion circulating fan passes through pipeline and main draught fan exit linkage.
The desulfurization, denitrification and dust removal integrated tower, the super dust and mist removal device, the online monitor and the direct exhaust chimney are vertically arranged from bottom to top in an integrated manner;
the on-line monitor is positioned on a channel between the super dedusting and demisting device and the direct exhaust chimney.
The invention also provides a process method of the desulfurization, denitrification and dedusting integrated technology, which adopts the process device combination and adopts the following process conditions:
1) flue gas of the coal-fired boiler firstly enters a bag-type dust remover to remove smoke dust and then is guided by a main induced draft fan to enter a denitration oxidation activation device;
2) the flue gas is in the denitration oxidation activation device 7 under the conditions of specific temperature, humidity, reaction speed, disturbance strengthening and the likeAccording to NaClO2The active oxidation potential and the like, firstly reacts with NO for oxidation activation, and NO is converted into high-valence nitrogen compounds, so that a prerequisite condition is created for absorbing and oxidizing sulfate and nitrate substances in the desulfurization and denitrification integrated tower;
3) the mixed solution of sodium chlorite enters a sodium chlorite storage tank, enters a denitration oxidation activation device through a sodium sulfite delivery pump, and is subjected to oxidation activation of raw materials;
4) the flue gas after oxidation activation enters a desulfurization, denitrification and dedusting integrated tower, and the flue gas after desulfurization and denitrification enters a super dedusting and demisting device at the upper part from bottom to top and is deeply dedusted and then is discharged into the atmosphere from a direct discharge chimney through an online monitor;
5) the flue gas at the outlet of the main induced draft fan returns a part of flue gas to the inlet of the boiler blower through the low-oxygen combustion circulating fan to be mixed with air to enter the hearth of the boiler so as to realize low-oxygen combustion.
Advantageous effects
The invention provides development of a desulfurization, denitrification and dedusting integrated technology. The method has the following beneficial effects: denitration efficiency is high, and the desulfurization ability is strong, carries out super dust removal defogging after the SOx/NOx control particulate matter and further reduces, can realize the minimum emission of sulphur, nitrogen oxide, dirt.
Principle of chemical process
The desulfurization and denitrification integrated process adopts two-stage process control processes of oxidation activation and calcium (alkali) wet absorption: the flue gas firstly enters a denitration oxidation activation device, NO is converted into high-valence nitrogen compounds by utilizing a sodium chlorite mixed solution, and then the flue gas enters a desulfurization and denitration integrated tower to absorb and oxidize sulfur dioxide and nitrogen oxides into sulfate and nitrate.
The chemical reaction formula is as follows
And (3) desulfurization process:
SO2+ NaClO2 (live) +2H2O ═ 2H2SO4+ NaCl
H2SO4+2CaOH＝Ca2SO4+2H2O
And (3) denitration process:
4NO +3NaClO2 (live) +2H2O ═ 4HNO3+3NaCl
CaOH+HNO3＝CaNO3+H2O
The denitration effect can be according to the volume of spouting of entry nitrogen oxide concentration adjustment denitration agent.
The main desulfurization process in the technology adopts a desulfurization process system which takes lime (stone) or (alkali substances) as a desulfurization absorbent, the desulfurization absorbent reacts with SO2 to generate calcium sulfite firstly, and then the calcium sulfite is oxidized into calcium sulfate, and the final product is gypsum.
Principle of desulfurization reaction
The SO2 and SO3 in the flue gas react with the water in the slurry droplets as follows:
SO2+H2O→HSO3-+H+
SO3+H2O→H2SO4
the SO3 and the H2SO4 generated by the water can react with the calcium carbonate contained in the lime in a short time.
SO2 and SO3 react with calcium carbonate contained in lime by the following ions:
Ca2++CO32-+HSO3-+2H+→Ca2++HSO3-+2H2O+CO2
ca2+ + CO32- + SO42- +2H + → Ca2+ + SO42- +2H2O + CO2 passing into O2 in the slurry tank of the desulfurization tower oxidizes the calcium sulfite to calcium sulfate, forming gypsum:
HSO3-+O2→2SO42-+2H+
Ca2++SO42-+2H2O→CaSO4·2H2O
note: the wet desulphurization effect of the double alkali method is better, and the device is also suitable for the dry desulphurization process outside the furnace.
Drawings
FIG. 1 is a schematic view of a combination of process units according to the present invention;
FIG. 2 is a schematic flow chart of the present invention.
In the figure: 1. a coal-fired boiler; 2. a bag-type dust collector; 3. a main induced draft fan; 4. a sodium chlorite storage tank; 5. a sodium sulfite delivery pump; 6. a denitration oxidation activation device; 7. a desulfurization, denitrification and dust removal integrated tower; 8. a super dedusting and demisting device; 9. an on-line monitor; 10. a direct exhaust chimney; 11. a low-oxygen combustion circulating fan; 12. a boiler furnace; 13. boiler blowers.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: the development of a desulfurization, denitrification and dust removal integrated technology adopts the following main equipment and combination modes:
the main equipment comprises a coal-fired boiler 1, a bag-type dust collector 2, a main induced draft fan 3, a sodium chlorite storage tank 4, a sodium sulfite delivery pump 5, a denitration oxidation activation device 6, a desulfurization, denitration and dust removal integrated tower 7, a super dust and mist removal device 8, an online monitor 9, a direct exhaust chimney 10, a low-oxygen combustion circulating fan 11, a boiler furnace 12 and a boiler blower 13;
the process equipment adopts the following combination mode:
boiler furnace 12 is located coal fired boiler 1's bottom, boiler blower 13's export is passed through the pipeline and is connected with boiler furnace 12, the gas outlet at coal fired boiler 1 top passes through the entry linkage of pipeline with sack cleaner 2, the exit of sack cleaner 2 passes through the entry linkage of pipeline with denitration oxidation activation device 6, denitration oxidation activation device 6's gas outlet passes through the entry linkage of pipeline with SOx/NOx control dust removal integration tower 7, the exit of SOx/NOx control dust removal integration tower 7 passes through the pipeline and the entry linkage of super dust removal defogging device 8, the export of super dust removal defogging device 8 passes through the pipeline and the entry linkage of directly discharging chimney 10, the exit port of low oxygen combustion circulating fan 11 passes through the entry linkage of pipeline with boiler blower 13, the entry of low oxygen combustion circulating fan 11 passes through pipeline and main draught fan exit linkage.
The desulfurization, denitrification and dust removal integrated tower 7, the super dust and mist removal device 8, the online monitor 9 and the direct exhaust chimney 10 are vertically arranged from bottom to top in an integrated manner;
the on-line monitor 9 is positioned on a channel between the super dedusting and demisting device 8 and the direct exhaust chimney 10.
The invention also provides a process method of the desulfurization, denitrification and dedusting integrated technology, which adopts the process device combination of claim 1 and adopts the following process conditions:
1) flue gas of the coal-fired boiler 1 firstly enters a bag-type dust collector 2 to remove 99.9% of smoke dust, and then is guided by a main induced draft fan 3 to enter a denitration oxidation activation device 7;
2) flue gas is treated according to NaClO in a denitration oxidation activation device 7 under the conditions of specific temperature, humidity, reaction speed, disturbance enhancement and the like2The method has the characteristics of active oxidation potential and the like, firstly, the NO reacts with NO for oxidation and activation, the NO is converted into high-valence nitrogen compounds, the conversion rate reaches 95%, and a prerequisite condition is created for absorbing and oxidizing sulfate and nitrate substances in the desulfurization and denitrification integrated tower 7;
3) the mixed solution of sodium chlorite enters a sodium chlorite storage tank 4 and enters a denitration oxidation activation device 6 through a sodium sulfite delivery pump 5 to carry out oxidation activation of raw materials;
4) the flue gas after oxidation activation gets into SOx/NOx control dust removal integration tower 7, and the flue gas after the super dust removal defogging device 8 degree of depth dust removal that the flue gas got into upper portion from bottom to top after SOx/NOx control is discharged into the atmosphere by direct vent chimney 10 through on-line monitor 9, and on-line monitor 9 detects the content of sulphur nitre and dust through various detecting element and is used for judging purifying effect through the control platform.
5) 3 export flue gas of main draught fan through low oxygen combustion circulating fan 11 return boiler air-blower 13 import with partly flue gas and mix the entering boiler furnace 12 with the air and realize the low oxygen combustion, the purpose reduces the original production of nitrogen oxide in boiler or industrial kiln, reduces the production of nitrogen oxide on the source to the quantity of final reduction denitrifier.
This scheme is used for various boilers or industrial kiln export flue gas at first get rid of the smoke and dust more than 99.9% through sack cleaner device 2 and get into special design's denitration oxidation activation device 6 after 3 pressurizations of main draught fan, turn into high-price nitrogen with NO more than 95% here, then get into SOx/NOx control dust removal integration tower 7, flue gas after SOx/NOx control has direct vent chimney 10 to discharge after super dust removal defogging, realize SOx/NOx control dust removal integration, realize ultralow emission, do benefit to the protection of environment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
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