CN106422702A - Desulfuration, denitration and energy conservation integrated purification system for coke oven flue gas and control method of system - Google Patents
Desulfuration, denitration and energy conservation integrated purification system for coke oven flue gas and control method of system Download PDFInfo
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- CN106422702A CN106422702A CN201610926107.8A CN201610926107A CN106422702A CN 106422702 A CN106422702 A CN 106422702A CN 201610926107 A CN201610926107 A CN 201610926107A CN 106422702 A CN106422702 A CN 106422702A
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- Prior art keywords
- flue gas
- flue
- heat recovery
- desulphurization denitration
- circulating fan
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- 239000003546 flue gas Substances 0.000 title claims abstract description 73
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000571 coke Substances 0.000 title claims abstract description 29
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 27
- 238000000746 purification Methods 0.000 title abstract description 7
- 238000004134 energy conservation Methods 0.000 title abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 21
- 238000011084 recovery Methods 0.000 claims description 36
- 238000007254 oxidation reaction Methods 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 27
- 230000003647 oxidation Effects 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 22
- 230000023556 desulfurization Effects 0.000 claims description 21
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 12
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000006200 vaporizer Substances 0.000 claims description 6
- 230000009191 jumping Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 5
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract 2
- 238000010531 catalytic reduction reaction Methods 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000003517 fume Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000004087 circulation Effects 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000006900 dealkylation reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- B01D53/54—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
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Development (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a desulfuration, denitration and energy conservation integrated purification system for coke oven flue gas and a control method of the system. An existing flue gas purification method is changed. Firstly, steam is prepared through a waste heat recycling system, and the temperature of the flue gas is lowered; secondly, nitric oxide in the flue gas is oxidized into NO2 through the preoxidation technology; finally, the nitric oxide and sulfide are removed at the same time in a desulfuration and denitration reaction tower, and the aim of purifying the flue gas is achieved. A coaxial internal combustion engine is used as a standby power device in the aspect of safety guarantee, and system safety accidents caused by emergency shutdown and temporary power outage are avoided. Under the condition that same flue gas purification indexes are reached, more waste heat recycling benefits are provided, the temperature of the flue gas does not need to be increased for catalytic reduction, a chimney hot standby system is also not needed, a lot of fuel can be saved, and complexity of a coke oven flue gas purification system is simplified.
Description
Technical field
The present invention relates to the desulphurization denitration energy saving integral of metallurgical industry field, more particularly to a kind of flue gases of cock oven purifies system
System and its control method.
Background technology
The production of metallurgy industry be unable to do without the coke of coke oven production.But the fuel that coke oven is used typically is made by oneself using in factory
Coke-stove gas, blast furnace gas or other gaseous fuels.Its composition difference is very big, and the composition of combustion product also has very big difference.
The main harmful components of the flue gas of coke oven discharge are based on nitrogen oxides and sulfide.Its sulfide comes from combustion gas
In sulfur-bearing composition, nitrogen oxides come from the nitrogen high-temperature oxydation in combustion air.
As the index of environment protection emission is improved.The fume emission of conventional coke oven is widely paid close attention to, and coke oven flue
Gas contains higher sensible heat, and its temperature reaches 220-300 DEG C.Using waste heat boiler, this partial fume sensible heat is reclaimed, become
For extensive technological trend.
China is ripe in the desulfurization process Technical comparing of flue gas, a lot of using the method for dry method, semi-dry desulphurization, realizes
To be also easier, the self-produced ammonia in coke-oven plant is generally used in the process of flue gases of cock oven, using the ammonia process of desulfurization.But in denitration
Field, method is less.It is generally adopted by SCR technology denitration.Mixed with flue gas using the self-produced ammonia in coke-oven plant, in denitrating tower
In reacted with catalyst, produce nitric acid ammonia, remove nitrogen oxides.
Using SCR denitration method, the catalyst resistance in its denitrating tower is larger, consumes substantial amounts of power current, and which is urged
Agent restricted lifetime, the replacement cycle is short, and under conditions of catalyst is not carried out large-scale production, operating cost is higher.
In whole desulphurization denitration residual heat system, using low temperature SCR denitration method, but catalyst is relatively costly, also has sulfur
Poisoning problem；Using high temperature SCR denitration method, because needing Repeat-heating, system inevitably causes the problem of pipeline complexity,
While can also increase more heat transmission equipments, increase system arrangement difficulty.
In addition, in production practices, as coke oven can not stop production at any time, in underground flue, -500Pa must be kept
Negative pressure, in system for cleaning fume blower fan stop jumping, it is also necessary to ensure that chimney keeps necessary draft, therefore, it is necessary to be
Chimney carries out hot standby.Stack temperature must keep more than 135 DEG C of temperature, and the flue-gas temperature of desulfurizing and purifying is not higher than 80 DEG C,
Chimney cannot be realized hot standby, no matter which kind of method therefore taken, it is necessary to have outer confession fuel to add, realize carrying for flue-gas temperature
High.Thereby increase the consumption of the energy.
Content of the invention
In order to overcome the above-mentioned deficiency of prior art, the invention provides a kind of desulphurization denitration energy-conservation one of flue gases of cock oven
Body cleaning system and its control method, are that the poisonous and harmful hot waste gas that a kind of coke-oven plant is discharged to coke oven underground flue is purified
And the one cleaning system of low-temperature heat quantity is reclaimed, the cleaning system technological process is simple, operational efficiency height.
For achieving the above object, the present invention employs the following technical solutions realization：
A kind of desulphurization denitration energy saving integral cleaning system of flue gases of cock oven, including waste-heat recovery device, circulating fan, interior
Combustion engine, pre-oxidation mixing arrangement, desulfurization and denitrification reaction tower；The smoke inlet of waste-heat recovery device connects coke oven cigarette by pipeline
Gas discharge line, the exhanst gas outlet of waste-heat recovery device connects circulating fan by pipeline, and the outfan of circulating fan is by pipe
Road connection pre-oxidation mixing arrangement, the exhanst gas outlet for pre-oxidizing mixing arrangement connects desulfurization and denitrification reaction tower, desulfurization by pipeline
Denitration reaction tower connects chimney by pipeline；Circulating fan provides power by motor, while circulating fan passes through overrunning cluth
Coaxially connected internal combustion engine.
It can also be waste heat boiler that the waste-heat recovery device can be heat recovery heat exchanger.
The heat recovery heat exchanger is by superheater, vaporizer, preheater and to be arranged on superheater, vaporizer and preheating
The drum of device upper end is constituted.
It is additionally provided with the pipeline that the outfan of the circulating fan is connected with pre-oxidation mixing arrangement and is directly connected to chimney
Branch road flue.
Also include to lead directly to the underground flue of chimney from coke oven, the gas approach of the flue and heat recovery heat exchanger and de-
The exhaust pass of sulfur denitration reaction tower is connected.
A kind of control method of the desulphurization denitration energy saving integral cleaning system of flue gases of cock oven, heat recovery heat exchanger is by Jiao
The heat of stove flue gas is reclaimed, and prepares steam；Denitrating flue gas adopt SNCR method, first use oxidizing process pretreatment, then pass through
Desulfurization and denitrification reaction tower is carried out while removing；System security assurance is provided dynamic using coaxial internal combustion engine in loss of circulator driving power
Power, it is ensured that system runs well；Specific as follows：
1) coke oven flue gas initially enter heat recovery heat exchanger and carry out heat exchange, produce steam；
2) power being provided by circulating fan, the flue gas after cooling is blasted pre-oxidation mixing arrangement, workshop is prepared by ozone
Ozone is provided to pre-oxidation mixing arrangement, flue gas carries out the mixed oxidization of nitrogen oxides in pre-oxidation mixing arrangement；
3) flue gas after aoxidizing enters desulfurization and denitrification reaction tower, while carrying out desulphurization denitration；
4) clean flue gas after processing enter chimney and are discharged；
5) run into during the use of system and shut off power in emergency or during fault stop jumping, motor speed is reduced to fence coverage, wink
Between start coaxial internal combustion engine take over motor drag circulating fan operation, it is to avoid fault, the stable operation of safeguards system, until recover
Electric power or be switched to underground flue by coke oven lead directly to chimney emission.
Compared with prior art, the invention has the beneficial effects as follows：
1) a kind of its technological process of desulphurization denitration energy saving integral cleaning system of flue gases of cock oven of the present invention is simple, and flue gas hinders
Power is little, is not required to chimney hot standby；
2) a kind of desulphurization denitration energy saving integral cleaning system of flue gases of cock oven of the present invention adopts SNCR denitration method, to nitrogen
Oxide carries out oxidation processes, and equipment is simple, without the need for more catalyst changeout, need not improve flue-gas temperature and can just realize the net of flue gas
Change；
3) the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven of the present invention, can be same in a purifying column
Two targets of Shi Shixian desulphurization denitration, purification efficiency height；
4) the internal combustion engine moving Force system coaxial with motor employed in the present invention, can continue as in power-off fault
Circulating fan provides power, ensures coke oven safety in production, while realization cancellation chimney long term thermal is standby, saves boiler hot for required
Be externally supplied fuel, while simplify flue gases of cock oven cleaning system complexity.
Description of the drawings
Fig. 1 is a kind of desulphurization denitration energy saving integral cleaning system flow chart of flue gases of cock oven of the present invention；
In figure：10. superheater；11. heat recovery heat exchangers；12. vaporizers；13. preheaters；14. drums；15. circulations
Blower fan；16 overrunning cluths；17. internal combustion engines；18. motors；19. pre-oxidation mixing arrangements；20. desulfurization and denitrification reaction towers；In 21.
Control room；Between 22. water treatment vehicles；23. ozone prepare workshop；24. change product workshop；25. low-pressure steam pipe networks；26. coke ovens；27.
Underground flue；28. chimneys；M1. underground flue gate；M2-M5. gas baffle valve.
Specific embodiment
Below in conjunction with the accompanying drawings embodiments of the present invention are further illustrated：
See Fig. 1, a kind of desulphurization denitration energy saving integral cleaning system of flue gases of cock oven, including waste-heat recovery device, circulation
Blower fan 15, internal combustion engine 17, pre-oxidation mixing arrangement 19, desulfurization and denitrification reaction tower 20；The smoke inlet of waste-heat recovery device passes through
Pipeline connects 26 smoke discharge tube road of coke oven, and the exhanst gas outlet of waste-heat recovery device connects circulating fan 15 by pipeline, follows
The outfan of ring blower fan 15 connects pre-oxidation mixing arrangement 19 by pipeline, pre-oxidizes the exhanst gas outlet of mixing arrangement 19 by pipe
Road connects desulfurization and denitrification reaction tower 20, and desulfurization and denitrification reaction tower 20 connects chimney 28 by pipeline；Circulating fan 15 is by motor 18
Power is provided, while circulating fan 15 passes through 16 coaxially connected internal combustion engine 17 of overrunning cluth.
It can also be waste heat boiler that the waste-heat recovery device can be heat recovery heat exchanger 11.
The heat recovery heat exchanger 11 is by superheater 10, vaporizer 12, preheater 13 and to be arranged on superheater 10, steam
The drum 14 for sending out device 12 and 13 upper end of preheater is constituted.
It is additionally provided with the pipeline that the outfan of the circulating fan 15 is connected with pre-oxidation mixing arrangement 19 and is directly connected to
The branch road flue of chimney 28.Gas baffle valve M5 is provided with the branch road flue.
Also include to lead directly to the underground flue 27 of chimney 28 from coke oven 26, the underground flue 27 and heat recovery heat exchanger 11
Gas approach and the exhaust pass of desulfurization and denitrification reaction tower 20 be connected.The gas approach of heat recovery heat exchanger 11 and underground
Before the junction point of flue 27 is arranged on underground flue gate M1.
In addition gas baffle valve M2 is provided with the gas approach of heat recovery heat exchanger 11, in desulfurization and denitrification reaction tower
Gas baffle valve M3 is provided with 20 exhaust pass, also is provided with gas baffle at the inlet duct of pre-oxidation mixing arrangement 19
Valve M4.
Will be chain with station service and the urgent detection means of accident for internal combustion engine 17, loop is formed, when 15 power-off of circulating fan
Emergency start is carried out to internal combustion engine 17, ensures the power of circulating fan 15.
A kind of control method of the desulphurization denitration energy saving integral cleaning system of flue gases of cock oven, heat recovery heat exchanger 11 will
The heat of flue gases of cock oven is reclaimed, and prepares steam；Denitrating flue gas adopt SNCR method, first use oxidizing process pretreatment, then lead to
Crossing desulfurization and denitrification reaction tower 20 is carried out while removing；System security assurance is using coaxial internal combustion engine 17 in 15 power-off of circulating fan
There is provided power, it is ensured that system runs well；Specific as follows：
1) coke oven flue gas initially enter heat recovery heat exchanger 11 and carry out heat exchange, produce steam.
Conventional coke oven 26 produces the burning gases of discharge, crosses in underground through pusher side and two auxillary flues of coke side,
Air is discharged to coke oven chimney 28 through underground flue 27.
The desulphurization denitration energy saving integral cleaning system of the flue gases of cock oven of the present invention, by the way of bypass, by coke oven
26 burning gases are extracted before the underground flue gate M1 of underground flue 27, by by-pass flue, initially enter waste heat
Reclaiming heat exchanger 11 carries out heat exchange, the sensible heat in recovered flue gas, and the heat absorption in 220-300 DEG C of flue gas exports steam
Use for owner, and flue-gas temperature is reduced to 135-165 DEG C.
Heat recovery heat exchanger 11, capital equipment is made up of superheater 10, vaporizer 12, preheater 13, drum 14, according to
Requirement of the owner to steam quality can cancel superheater 10, only production saturated vapor.Residual heat system water is between water treatment vehicle
22 are prepared, and reach the water quality requirement of desalination or softening, enter back into heat recovery heat exchanger 11, and heat recovery heat exchanger 11 is given birth to
The steam of product delivers to user's use through steam pipe system 25.
2) power being provided by circulating fan 15, the flue gas after cooling is blasted pre-oxidation mixing arrangement 19, is prepared by ozone
Workshop 23 provides ozone to pre-oxidation mixing arrangement 19, and flue gas carries out the mixing oxygen of nitrogen oxides in pre-oxidation mixing arrangement 19
Change.
Flue gas is lowered the temperature after heat recovery heat exchanger 11, pressurizes through circulating fan 15, blasts pre-oxidation mixing arrangement 19.
Ozone prepares workshop 23 and manufactures ozone O3, it is pipelined to pre-oxidize in mixing arrangement 19, with the flue gas after cooling
Premixing is carried out, contained nitrogen oxide NOx in flue gas is carried out preliminary oxidation and generates NO2、N2O5Deng.
In flue gas, the main composition of NOx is that NO, NO are insoluble in water, and the NO of high-valence state2、N2O5Deng water soluble, generate
HNO2And HNO3, the big much progress of solvability, so as to can be with the SO in later stage2While absorbing, the purpose of simultaneous SO_2 and NO removal is reached.
NO fast and effeciently can be oxidized to high-valence state as a kind of strong oxidizer of cleaning by ozone.O as oxidant3With NOx
Between specific chemical reaction mechanism more complicated.Oxidation mechanisms are：
NO+O3→NO2+O2
NO2+O3→NO3+O2
NO3+NO2→N2O5
Ozone simultaneous SO_2 and NO removal mainly uses the strong oxidizing property of ozone and NO is oxidized to high-valence state nitrogen oxides, then
By high-valence state nitrogen oxides and sulfur dioxide while sorption enhanced is the material for being dissolved in water in scrubbing tower, the mesh of removing is reached
's.
3) flue gas after aoxidizing enters desulfurization and denitrification reaction tower, while carrying out desulphurization denitration.
The above-mentioned flue gas through oxidation pre-treatment, is passed through desulfurization and denitrification reaction tower 20, and the device is made using product workshop 24 is changed
Standby ammonia is processed to flue gas, is generated nitric acid ammonia salt and ammonium sulfate, removing high-valence state nitrogen oxides and sulfide, is made cigarette
The component ratio of gas reaches discharge standard, reaches the purpose of purification.
4) clean flue gas after processing enter chimney and are discharged.
5) run into during the use of system and shut off power in emergency or during fault stop jumping, 15 rotating speed of motor is reduced to fence coverage,
The coaxial internal combustion engine 17 of moment startup is taken over the dragging circulating fan 15 of motor 18 and is run, it is to avoid fault, the stable operation of safeguards system,
Until recovering electric power or be switched to underground flue 27 and lead directly to chimney 28 by coke oven 26 to discharge fume.
Circulating fan 15 provides power using motor 18, and adopts the series connection coaxial with internal combustion engine 17 of overrunning cluth 16, makes
With in run into and shut off power in emergency or during fault stop jumping, 18 rotating speed of motor is reduced to fence coverage, can start coaxial internal combustion engine 17 at any time
Take over motor 18 and drag circulating fan 15, it is to avoid fault, and internal combustion engine 17 carries small generator and can control system to central authorities
System UPS provide 380-420V electric power.
The control method of the present invention is using central control system DCS or the PLC positioned at Central Control Room 21, and waste heat recovery is filled
Put, pre-oxidize mixing arrangement 19, integrated desulfurization dealkylation reaction tower 20 and supporting circulating fan system, water supply system and flue gas
Tubing etc. carries out being uniformly coordinated, comprehensive data acquisition and control.When system is enabled, underground flue gate M1 and flue gas is closed
Flapper valve M5.Damper valve M2, M3 and M4 is opened, makes passage smoothness, each system worked well.If system for desulfuration and denitration enters
During row maintenance, then damper valve M5 is opened, M3 and M4 is closed, system for desulfuration and denitration is cut off, waste-heat recovery device also can be independent
Work.
The safety-critical point of the other present invention is powered off the supporting coaxial internal combustion engine 17 of protection system, i.e. circulating fan 15 and fills
Put.The present invention does not need chimney hot-backup system, and in the case of emergency shutdown or unexpected power-off, internal combustion engine 17 starts, and utilizes
Overrunning cluth 16 is connected with motor fan main shaft, provides stand-by power, under the flue pressure that so avoiding has a power failure causes
Drop.
If exhaust gases passes are switched to underground flue 27, discharged fume using the draft of chimney 28 itself, then after a loss of power, interior
Combustion engine 17 starts, and drags circulating fan 15 and proceeds forced fume exhaust, while opening damper valve M5, closing M3 and M4, stopping
The only work of system for desulfuration and denitration.Using fume afterheat, chimney 28 is preheated, when the temperature of chimney 28 reaches 150 DEG C,
Meeting the temperature requirement of natural draught system, then underground flue gate M1 is opened, damper valve M2 and M5 is closed, flue gas is made by ground
Lower flue 27 is discharged.The switching of flue gas circulation passage is finished, and according to system main points, can stop the operation of residual neat recovering system.
Claims (6)
1. the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven, it is characterised in that including waste-heat recovery device, follow
Ring blower fan, internal combustion engine, pre-oxidation mixing arrangement, desulfurization and denitrification reaction tower；The smoke inlet of waste-heat recovery device is by pipeline even
Connect coke oven flue gas discharge line, the exhanst gas outlet of waste-heat recovery device connects circulating fan by pipeline, circulating fan defeated
Go out end and pre-oxidation mixing arrangement is connected by pipeline, the exhanst gas outlet for pre-oxidizing mixing arrangement is anti-by pipeline connection desulphurization denitration
Tower is answered, desulfurization and denitrification reaction tower connects chimney by pipeline；Circulating fan provides power by motor, while circulating fan is by super
The coaxially connected internal combustion engine of speed clutch.
2. the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven according to claim 1, it is characterised in that
It can also be waste heat boiler that the waste-heat recovery device can be heat recovery heat exchanger.
3. the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven according to claim 2, it is characterised in that
The heat recovery heat exchanger is by superheater, vaporizer, preheater and to be arranged on superheater, vaporizer and preheater upper end
Drum is constituted.
4. the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven according to claim 1, it is characterised in that
The branch road cigarette for being directly connected to chimney is additionally provided with pre-oxidation mixing arrangement on the pipeline that the outfan of the circulating fan is connected
Road.
5. the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven according to claim 1, it is characterised in that
Also include to lead directly to the underground flue of chimney from coke oven, the flue is anti-with the gas approach of heat recovery heat exchanger and desulphurization denitration
The exhaust pass of tower is answered to be connected.
6. the control method of the desulphurization denitration energy saving integral cleaning system of a kind of flue gases of cock oven as claimed in claim 1, its
It is characterised by, the heat of flue gases of cock oven is reclaimed by heat recovery heat exchanger, prepares steam；Denitrating flue gas adopt SNCR side
Method, is first used oxidizing process pretreatment, then is carried out by desulfurization and denitrification reaction tower while removing；System security assurance adopts coaxial internal combustion
Machine provides power in loss of circulator driving power, it is ensured that system runs well；Specific as follows：
1) coke oven flue gas initially enter heat recovery heat exchanger and carry out heat exchange, produce steam；
2) power being provided by circulating fan, the flue gas after cooling being blasted pre-oxidation mixing arrangement, workshop is prepared to pre- from ozone
Oxidation mixing arrangement provides ozone, and flue gas carries out the mixed oxidization of nitrogen oxides in pre-oxidation mixing arrangement；
3) flue gas after aoxidizing enters desulfurization and denitrification reaction tower, while carrying out desulphurization denitration；
4) clean flue gas after processing enter chimney and are discharged；
5) run into during the use of system and shut off power in emergency or during fault stop jumping, motor speed is reduced to fence coverage, and moment opens
Move coaxial internal combustion engine and take over the operation of motor drag circulating fan, it is to avoid fault, the stable operation of safeguards system, until recovering electric power
Or underground flue is switched to by the straight-through chimney emission of coke oven.
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| CN201610926107.8A CN106422702A (en) | 2016-10-31 | 2016-10-31 | Desulfuration, denitration and energy conservation integrated purification system for coke oven flue gas and control method of system |
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| CN201610926107.8A CN106422702A (en) | 2016-10-31 | 2016-10-31 | Desulfuration, denitration and energy conservation integrated purification system for coke oven flue gas and control method of system |
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