CN103990375A - Integrated semi-dry purifying method for sintering flue gas - Google Patents
Integrated semi-dry purifying method for sintering flue gas Download PDFInfo
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- CN103990375A CN103990375A CN201410229298.3A CN201410229298A CN103990375A CN 103990375 A CN103990375 A CN 103990375A CN 201410229298 A CN201410229298 A CN 201410229298A CN 103990375 A CN103990375 A CN 103990375A
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Abstract
The invention relates to an integrated semi-dry purifying method for sintering flue gas. The method is adopted to perform high-efficiency desulfuration, denitration, and dioxin and heavy metal removal on sintering flue gas, an oxidizing agent generating and distributing device is connected on a flue gas pipeline in front of an absorption reaction tower of a semi-dry desulfurization system, uniformly-sprayed oxidizing agents and NO in flue gas are fully reacted to oxidize NO in the flue gas into NO2, and then flue gas enters the absorption reaction tower to be reacted with absorbing agents to achieve the purposes of desulfuration, denitration and dioxin and heavy metal removal. Compared with the prior art, the method has the beneficial effects that firstly, the method is suitable for all the semi-dry sintering flue gas purifying systems and can achieve the purposes of desulfuration, denitration and dioxin and heavy metal removal of the sintering flue gas in an integrated manner; secondly, the structure is simple, the occupied area is small and the operation maintenance is convenient; thirdly, the spraying amount of the oxidizing agents, the reaction time and the removal efficiency are easy to control and adjust; fourthly the investment and the operating cost are reduced; fifthly, the method is suitable for new semi-dry desulfurization systems and the transformed systems of the existing desulfurization systems.
Description
Technical field
The present invention relates to sintering gas purifying technology, relate in particular to a kind of semidry method sinter fume integrated purifying method.
Background technology
Through effort in a few years, China's steel and iron industry sintering flue gas desulfurization technology is ripe gradually, for further administering and pollute, improve environment, country " 12 " planning clearly increases NOx as reducing discharging the binding indicator, the purified treatment of progressively carrying out Dui bioxin and heavy metal simultaneously, therefore existing enterprise starts to attempt sinter fume to carry out denitration, Tuo bioxin, removing heavy-metal processing now, or in sintering flue gas desulfurization, reserve denitration, de-bioxin, removing heavy-metal position, to be that the enforcement of the sinter fume comprehensive regulation in future creates favorable conditions.
Flue gas desulfurization has three kinds of dry method, semidry method, wet method.Dry desulfurization efficiency is lower, although wet desulphurization desulfuration efficiency is higher, exists equipment investment large, and floor space is large, water resource waste, and the shortcoming such as secondary pollution is serious, therefore the application of wet desulphurization is subject to certain restriction.The most semi-dry desulphurizations that adopt of flue gas of sintering machine now.Semi-dry desulphurization has many kinds, comprise rotary spraying and drying sulfur removal technology, Circulating Fluidized Bed Process, dense-phase tower method desulfurization skill, ENS semi-dry desulphurization, VAI MEROS sulfur removal technology, LEC semidry methods etc. are multiple, adopt to directly spraying into quick lime slurries in absorption reaction tower to react with flue gas no matter be, still adopt calcium lime powder and atomized water to react with flue gas at Ta Nei, after end reaction, drop is dried rapidly by sinter fume heat, form dry state powder-material, then continuing trapping by sack cleaner purifies, therefore semi-dry desulphurization does not produce waste water.
Domestic many steel mills adopt semidry method to carry out sintering flue gas desulfurization, as Anshan iron and steel plant, Sha Gang, Ji steel, Handan Iron and Steel Co, logical steel, Wuhan Iron and Steel Plant, Wu Gang, Steel Tube in Tianjin etc. all adopt rotating spraying sulfur removal technology, by the High Rotation Speed of rotary atomizer in absorption reaction tower, the droplet that desulfurizer slurry is atomized into 30-80 micron sprays in absorption reaction tower, and tower sodalime slurry droplet (absorbent) absorbs rapidly the SO in flue gas
2, reach and remove SO
2and the object of other acid mediums.Meanwhile, sinter fume heat is the dry drop spraying in tower rapidly, forms dry state powder-material, is trapped by sack cleaner.
Baosteel, Sanming City steel mill, Tianjin Steel Works, Aug. 1st steel mill, Shoudu Iron and Steel Co, day iron etc. all adopt circulating fluid bed semi-drying method desulfurization, after quicklime slaking, enter in absorption reaction tower, under fluidized state with SO
2reaction, then discharge after deduster purifies, Desulphurization returns to fluidisation circulation.Because ciculation fluidized bed ensemble forms larger contact area, improve desulfuration efficiency.
Shijiazhuang steel mill adopts dense-phase tower semi-dry desulphurization, utilize dry powder calcium-based desulfurizing agent to carry out humidification digestion together with sack dust, buck 3～5% is entered and the smoke reaction being entered by top by tower top, reactivity, mobility that moisture ash circulation has had, this method is provided with agitating device, strengthened mass transfer, desulfuration efficiency reaches 90%, sorbent utilization 98%.
The ENS semi-dry desulphurization that Baogang adopts, CaOH the new powder of MgOH add pipeline, flue gas carries it into reaction tower, react with atomized water, through moistening, reaction, be dried, electric precipitation, the such course of reaction of discharge.ENS semi-dry desulphurization can be realized desulfurization simultaneously, defluorination.
In addition, Ma Gang selects VAI MEROS sulfur removal technology, ripples steel to select LEC desulfurization all to belong to semi-dry desulfurizing process.
Power-plant flue gas NO
xconcentration is higher, therefore power plant takes the lead in having carried out denitrating flue gas improvement, at present both at home and abroad coal-fired plant flue gas denitration technology reaches its maturity and is perfect, and applying more is selective catalytic reduction (SCR) and non-selective catalytic reduction (SNCR) and active carbon adsorption etc.In numerous denitration technologies, selective catalytic reduction (SCR) is that denitration efficiency is the highest, the most ripe denitration technology.
At present, the smoke comprehensive of domestic sintering flue gas desulfurization, denitration, Tuo bioxin, removing heavy-metal is administered technology also in the exploratory stage, prior art is all based on spray column Wet purifier, and the not application example aspect sintering gas purifying, and the semi-dry desulphurizations of the most employing of flue gas of sintering machine now, the sintering machine of iron and steel enterprise does not arrange the smoke eliminator of special denitration, Tuo bioxin, removing heavy-metal mostly yet.
Summary of the invention
The invention provides a kind of semidry method sinter fume integrated purifying method, oxidant is set before existing semi-dry desulphurization system absorption reaction tower and occurs and distributor, can realize the object of sinter fume being carried out to high-efficiency desulfurization, denitration, Tuo bioxin and heavy metal.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A kind of semidry method sinter fume integrated purifying method, can carry out high-efficiency desulfurization, denitration, Tuo bioxin and heavy metal to sinter fume, on flue before semi-dry desulphurization system absorption reaction tower, access oxidant occurs and distributor, the oxidant evenly spraying into fully reacts with the NO in flue gas, and the NO in flue gas is oxidized to NO
2after, then enter absorption reaction tower and react with absorbent, reach desulphurization and denitration, remove the object of bioxin and heavy metal.
Described semi-dry desulphurization system is any in rotary spraying and drying desulphurization system, circulating fluidized bed desulfur system, dense-phase tower method desulphurization system, ENS semi-dry desulphurization system, VAI MEROS desulphurization system and LEC semi-dry desulphurization system.
Described oxidant occurs to be made up of the oxidant generator being connected successively, oxidant thinning tank and oxidizer distributor with distributor, oxidant generator is also connected with recirculating cooling water system and high voltagehigh frequency power supply, before oxidant thinning tank, establish mixing blower fan, oxidizer distributor is located at the oxidant entrance place on the front smoke conveying duct of absorption reaction tower.
For realizing a kind of device of semidry method sinter fume integrated purifying method, comprise the absorption reaction tower and udst separation and the tapping equipment that connect by smoke conveying duct, described absorption reaction tower connects lime slurry or quick lime preparation and conveying device and fresh water (FW) waterworks in addition, and the flue gas input channel before absorption reaction tower connects in addition oxidant and occurs and distributor.
A kind of semidry method sinter fume integrated purifying method, the absorption reaction tower of described rotary spraying and drying desulphurization system is rotary spraying and drying desulfurizing tower, base sinter fume integrated purifying method thereon comprises the steps:
1) from the head flue gas of sintering machine after electric cleaner purifies, drawn by main exhauster exhaust pass, after gas bypass flapper valve and inlet baffle valve switch, enter smoke conveying duct;
2) oxidant generator produces oxidant under the electric discharge of high voltagehigh frequency power supply and recirculating cooling water system acting in conjunction, the air that oxidant and mixing blower fan produce dilutes mixing in oxidant thinning tank, dilute mixed oxidant and spray into smoke conveying duct by the oxidizer distributor being arranged on before absorption reaction tower, react through the NO in the uniform rear oxidation agent of oxidizer distributor and sinter fume, the NO in flue gas is oxidized to NO
2; Press 6:4 proportional diverting with the flue gas after oxidant reaction, carry out, after airflow uniform distribution, entering rotary spraying and drying desulfurizing tower through top smoke distributor and center smoke distributor;
3) quick lime add water be configured to solid content be 20%～25% lime slurry as absorbent, lime slurry and technique temperature lowering water are sent in the slurries top tank that is placed in rotary spraying and drying desulfurizing tower top simultaneously and are diluted, according to SO in flue gas
2with NO
2concentration is determined the addition of lime slurry, determine the addition of temperature lowering water according to flue-gas temperature, lime slurry after mixed diluting is from flowing into rotary atomizer, and lime slurry is atomized into the superfine little droplet of 30～80 μ m by the atomizer of High Rotation Speed, thereby increased SO in absorbent and flue gas
2with NO
2deng the specific area of sour gas contact;
4), in rotary spraying and drying desulfurizing tower, flue gas contacts with the lime slurry of atomization, SO
2with NO
2deng pickling gas and absorbent generation physics, chemical reaction, generate the accessory substances such as calcium sulfate, calcium sulfite, calcium nitrate and calcium nitrite, these accessory substances are about by various particle diameters the dry too cluster of grains powder that 0.05mm particle forms, therefore its specific area is very large, solid granulates surface compared with hightension, the nuisances such as bioxin and heavy metal Hg in flue gas are had to stronger suction-operated, thereby reach desulphurization and denitration, remove the object of bioxin and heavy metal;
5) absorption and sorption SO
2, NO
2the dry powdery particulate fraction of, bioxin, heavy metal is discharged at the bottom of sinking to tower, is regularly transported outward by tank car; All the other particles enter sack cleaner with flue gas discharge rotary spraying and drying desulfurizing tower and further purify and gas solid separation, and clean flue gas is taken out under the effect of drawing and entered atmosphere through outlet damper valve by chimney at booster fan; The dust that sack cleaner is collected is regularly transported outward by tank car.
For realizing a kind of device of semidry method sinter fume integrated purifying method, comprise that the rotary spraying and drying desulfurizing tower and the bag-type dusting that connect by smoke conveying duct purify and tapping equipment, rotary spraying and drying desulfurizing tower connects lime slurry preparation and conveying device and technique temperature lowering water waterworks in addition, and the flue gas input channel before rotary spraying and drying desulfurizing tower connects in addition oxidant and occurs and distributor.
Described smoke conveying duct is provided with inlet baffle valve and by-pass damper valve.
Described rotary spraying and drying desulfurizing tower is provided with top smoke distributor, center smoke distributor and rotary atomizer.
Described bag-type dusting purifies and tapping equipment is made up of the sack cleaner connecting successively by pipeline, booster fan and chimney, sets out a mouthful flapper valve on pipeline.
Described oxidant occurs to be stainless steel with pipeline and the equipment of distributor, and the smoke conveying duct inwall that autoxidator entrance rises is laid anti-corrosion material, laying length 1～5m.
Compared with prior art, the invention has the beneficial effects as follows:
1) be applicable to all semidry method sintering smoke purifying systems, can realize sintering flue gas desulfurization, denitration, Tuo bioxin, removing heavy-metal integrated purifying object;
2) simple in structure, floor space is little, does not increase resistance, the convenient operating maintenance of desulphurization system;
3) can, according to the content of the nuisances such as flue gas NOx, control oxidant straying quatity and oxidant reaction time and removal efficiency, be easy to control and regulate;
4) make full use of semi-dry desulfurizing process and equipment, realize the target of desulphurization and denitration, Tuo bioxin, removing heavy-metal simultaneously, not only saved construction investment but also reduced operating cost;
5) the present invention is not only applicable to newly-built sintering device flue gas semi-dry desulphurization, denitration, de-bioxin, removing heavy-metal, can meet the gas cleaning needs of setting up denitration, de-bioxin, removing heavy-metal after built sintering device flue gas semi-dry desulphurization system yet.
Brief description of the drawings
Fig. 1 is the technological process for flue gas purification figure based on rotary spraying and drying desulfurizing tower of the present invention.
In figure: 1. sintering machine 2. electric cleaner 3. main exhauster 4. inlet baffle valve 5. by-pass damper valve 6. rotary spraying and drying desulfurizing tower 7. top smoke distributor 8. center smoke distributor 9. rotary atomizer 10. lime slurry preparations and conveying device 11. technique temperature lowering water waterworks 12. slurries top tank 13. sack cleaner 14. booster fan 15. outlet damper valve 16. chimney 17. oxidant generator 18. high voltagehigh frequency power supply 19. recirculating cooling water systems 20. mix blower fan 21. oxidant thinning tank 22. oxidizer distributors
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
A kind of semidry method sinter fume of the present invention integrated purifying method, can carry out high-efficiency desulfurization, denitration, Tuo bioxin and heavy metal to sinter fume, on flue before semi-dry desulphurization system absorption reaction tower, access oxidant occurs and distributor, the oxidant evenly spraying into fully reacts with the NO in flue gas, and the NO in flue gas is oxidized to NO
2after, then enter absorption reaction tower and react with absorbent, reach desulphurization and denitration, remove the object of bioxin and heavy metal.
Described semi-dry desulphurization system is any in rotary spraying and drying desulphurization system, circulating fluidized bed desulfur system, dense-phase tower method desulphurization system, ENS semi-dry desulphurization system, VAI MEROS desulphurization system and LEC semi-dry desulphurization system.
Described oxidant occurs to be made up of the oxidant generator 17 being connected successively, oxidant thinning tank 21 and oxidizer distributor 22 with distributor, oxidant generator 17 is also connected with recirculating cooling water system 19 and high voltagehigh frequency power supply 18, before oxidant thinning tank 21, establish and mix blower fan 20, oxidizer distributor 22 is located at the oxidant entrance place on the front smoke conveying duct of absorption reaction tower.
For realizing a kind of device of semidry method sinter fume integrated purifying method, comprise the absorption reaction tower and udst separation and the tapping equipment that connect by smoke conveying duct, described absorption reaction tower connects lime slurry or quick lime preparation and conveying device and fresh water (FW) waterworks in addition, and the flue gas input channel before absorption reaction tower connects in addition oxidant and occurs and distributor.
Seeing Fig. 1, is the technological process for flue gas purification figure based on rotary spraying and drying desulphurization system of the present invention.In the time that the absorption reaction tower of described rotary spraying and drying desulphurization system is rotary spraying and drying desulfurizing tower 6, base sinter fume integrated purifying method thereon comprises the steps:
1) from the head flue gas of sintering machine 1 after electric cleaner 2 purifies, drawn by main exhauster 3 exhaust pass, after gas bypass flapper valve 5 and inlet baffle valve 4 switch, enter smoke conveying duct;
2) oxidant generator 17 high voltagehigh frequency power supply 18 discharge and recirculating cooling water system 19 actings in conjunction under produce oxidant, the air that oxidant and mixing blower fan 20 produce dilutes mixing in oxidant thinning tank 21, dilute mixed oxidant and spray into smoke conveying duct by the oxidizer distributor 22 being arranged on before absorption reaction tower, react through the NO in the uniform rear oxidation agent of oxidizer distributor 22 and sinter fume, the NO in flue gas is oxidized to NO
2; Press 6:4 proportional diverting with the flue gas after oxidant reaction, carry out, after airflow uniform distribution, entering rotary spraying and drying desulfurizing tower 6 through top smoke distributor 7 and center smoke distributor 8;
3) quick lime add water be configured to solid content be 20%～25% lime slurry as absorbent, lime slurry and technique temperature lowering water are sent in the slurries top tank 12 that is placed in rotary spraying and drying desulfurizing tower 6 tops simultaneously and are diluted, according to SO in flue gas
2with NO
2concentration is determined the addition of lime slurry, determine the addition of temperature lowering water according to flue-gas temperature, lime slurry after mixed diluting is from flowing into rotary atomizer 9, and lime slurry is atomized into the superfine little droplet of 30～80 μ m by the atomizer 9 of High Rotation Speed, thereby increased SO in absorbent and flue gas
2with NO
2deng the specific area of sour gas contact;
4), in rotary spraying and drying desulfurizing tower 6, flue gas contacts with the lime slurry of atomization, SO
2with NO
2deng pickling gas and absorbent generation physics, chemical reaction, generate the accessory substances such as calcium sulfate, calcium sulfite, calcium nitrate and calcium nitrite, these accessory substances are about by various particle diameters the dry too cluster of grains powder that 0.05mm particle forms, therefore its specific area is very large, solid granulates surface compared with hightension, the nuisances such as bioxin and heavy metal Hg in flue gas are had to stronger suction-operated, thereby reach desulphurization and denitration, remove the object of bioxin and heavy metal;
5) absorption and sorption SO
2, NO
2the dry powdery particulate fraction of, bioxin, heavy metal is discharged at the bottom of sinking to tower, is regularly transported outward by tank car; All the other particles enter sack cleaner 13 with flue gas discharge rotary spraying and drying desulfurizing tower 6 and further purify and gas solid separation, and clean flue gas is taken out under the effect of drawing and entered atmosphere through outlet damper valve 15 by chimney 16 at booster fan 14; The dust that sack cleaner 13 is collected is regularly transported outward by tank car.
For realizing a kind of device of semidry method sinter fume integrated purifying method, based on rotary spraying and drying desulphurization system, comprise that the rotary spraying and drying desulfurizing tower 6 and the bag-type dusting that connect by smoke conveying duct purify and tapping equipment, rotary spraying and drying desulfurizing tower 6 connects lime slurry preparation and conveying device 10 and technique temperature lowering water waterworks 11 in addition, and the flue gas input channel before rotary spraying and drying desulfurizing tower 6 connects in addition oxidant and occurs and distributor.
Described smoke conveying duct is provided with inlet baffle valve 4 and by-pass damper valve 5.
Described rotary spraying and drying desulfurizing tower 6 is provided with top smoke distributor 7, center smoke distributor 8 and rotary atomizer 9.
Described bag-type dusting purifies and tapping equipment is made up of the sack cleaner 13 connecting successively by pipeline, booster fan 14 and chimney 16, sets out mouthful flapper valve 15 on pipeline.
Described oxidant occurs to be stainless steel with pipeline and the equipment of distributor, and the smoke conveying duct inwall that autoxidator entrance rises is laid anti-corrosion material, laying length 1～5m.
The object that oxidizer distributor 7 is set is in order to ensure that the oxidant entering on the front smoke conveying duct of absorption reaction tower 6 is evenly distributed.
In order to prevent the corrosion of oxidant to desulfurization duct, in the situation that ensureing denitration efficiency, suitably control the straying quatity of oxidant.
After 9 atomizations of High Rotation Speed atomizer, lime slurry becomes superfine little droplet, has increased lime slurry and SO
2, NO
2deng the contact gear ratio surface area of sour gas, improve the efficiency of desulphurization and denitration, Tuo bioxin and heavy metal.
The operation principle of a kind of semidry method sinter fume of the present invention integrated purifying method is: utilize the strong oxidizing property of oxidant that the NO in sinter fume is oxidized to NO
2, NO
2with SO
2, SO
3, other sour gas such as HCl, HF react with absorbent together in absorption reaction tower 6, generate the accessory substances such as calcium sulfate, calcium sulfite, calcium nitrate and calcium nitrite, these accessory substances are about by various particle diameters the dry too cluster of grains powder that 0.05mm particle forms, therefore its specific area is very large, solid granulates surface compared with hightension, the nuisances such as bioxin and heavy metal Hg in flue gas are had to stronger suction-operated, thereby reach desulphurization and denitration, remove the object of bioxin and heavy metal;
After the method for the invention is processed, the desulfuration efficiency of sinter fume is greater than to 90%, denitration efficiency is greater than 50%, and the clearance that the clearance of heavy metal Hg is greater than 60% ， bioxin is greater than 40%, to SO
3, the acidic materials such as HCl, HF have 100% removal efficiency.
Following examples are implemented under taking technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
A kind of semidry method sinter fume of [embodiment 1] application the present invention integrated purifying method is to the ironmaking head factory West B of Angang Stock Co., Ltd series 328m
2sintering device flue gas carries out purified treatment
In the present embodiment, to the ironmaking head factory West B of Angang Stock Co., Ltd series 328m
2the original rotary spraying and drying desulphurization system of sintering machine is transformed, and on the flue before rotary spraying and drying desulfurizing tower 6, access oxidant occurs and distributor.Improved device comprises that the rotary spraying and drying desulfurizing tower 6 and the bag-type dusting that connect by smoke conveying duct purify and tapping equipment, rotary spraying and drying desulfurizing tower 6 connects lime slurry preparation and conveying device 10 and technique temperature lowering water waterworks 11 in addition, and the flue gas input channel before rotary spraying and drying desulfurizing tower 6 connects in addition oxidant and occurs and distributor.
Described oxidant occurs to be stainless steel with pipeline and the equipment of distributor, and the smoke conveying duct inwall that autoxidator entrance rises is laid anti-corrosion material, laying length 4m.
Specific embodiment is as follows:
, after electric cleaner 2 purifies, drawn by main exhauster 3 exhaust pass from the head flue gas of sintering machine 1, after gas bypass flapper valve 5 and inlet baffle valve 4 switch, enter smoke conveying duct;
The present embodiment adopts ozone as oxidant, oxidant generator 17 high voltagehigh frequency power supply 18 discharge and recirculating cooling water system 19 actings in conjunction under produce oxidant, the air that oxidant and mixing blower fan 20 produce dilutes mixing in oxidant thinning tank 21, dilute mixed oxidant (oxidant concentration is diluted to and is about 25mg/L by 150mg/L) and spray into smoke conveying duct by the oxidizer distributor 22 being arranged on before rotary spraying and drying desulfurizing tower 6, react through the NO in the uniform rear oxidation agent of oxidizer distributor 22 and sinter fume, NO in flue gas is oxidized to NO
2, press 6:4 proportional diverting with the flue gas after oxidant reaction, carry out, after airflow uniform distribution, entering rotary spraying and drying desulfurizing tower 6 through top smoke distributor 7 and center smoke distributor 8,
Quick lime add water be configured to solid content be 25% lime slurry as absorbent, lime slurry and technique temperature lowering water are sent in the slurries top tank 12 that is placed in rotary spraying and drying desulfurizing tower 6 tops simultaneously and are diluted, according to SO in flue gas
2with NO
2concentration is determined the addition of lime slurry, determines the addition of temperature lowering water according to flue-gas temperature, under nominal situation condition, often removes the SO of 100mg
2, the lime white liquid measure that need spray into solid content 20%～25% is 1t/h left and right, 10 DEG C of the every reductions of flue-gas temperature, and delime slurries have outside certain cooling effect, and also needing to spray into technique temperature lowering water is 1t/h left and right.Lime slurry after mixed diluting is from flowing into rotary atomizer 9, and lime slurry is atomized into the superfine little droplet of 30～80 μ m by the atomizer 9 of High Rotation Speed, thereby increased SO in absorbent and flue gas
2with NO
2deng the specific area of sour gas contact;
In rotary spraying and drying desulfurizing tower 6, flue gas contacts with the lime slurry of atomization, SO
2with NO
2deng sour gas and absorbent generation physics, chemical reaction, generate the accessory substances such as calcium sulfate, calcium sulfite, calcium nitrate and calcium nitrite, these accessory substances are about by various particle diameters the dry state cluster of grains powder that 0.05mm particle forms, therefore its specific area is very large, solid granulates surface compared with hightension, the nuisances such as bioxin and heavy metal Hg in flue gas are had to stronger suction-operated, thereby reach desulphurization and denitration, remove the object of bioxin and heavy metal;
In the present embodiment, after the method for the invention is processed, the desulfuration efficiency that burns flue gas is greater than to 90%, denitration efficiency is greater than 62%, and the clearance that the clearance of heavy metal Hg is greater than 65% ， bioxin is greater than 43%, to SO
3, the acidic materials such as HCl, HF removal efficiency be 100%.
Absorption and sorption SO
2, NO
2the dry powdery particulate fraction of, bioxin, heavy metal is discharged at the bottom of sinking to tower, is regularly transported outward by tank car; All the other particles enter sack cleaner 13 with flue gas discharge rotary spraying and drying desulfurizing tower 6 and further purify and gas solid separation, and clean flue gas is taken out under the effect of drawing and entered atmosphere through outlet damper valve 15 by chimney 16 at booster fan 14; The dust that sack cleaner 13 is collected is regularly transported outward by tank car.
Claims (10)
1. a semidry method sinter fume integrated purifying method, can carry out high-efficiency desulfurization, denitration, Tuo bioxin and heavy metal to sinter fume, it is characterized in that, on flue before semi-dry desulphurization system absorption reaction tower, access oxidant occurs and distributor, the oxidant evenly spraying into fully reacts with the NO in flue gas, and the NO in flue gas is oxidized to NO
2after, then enter absorption reaction tower and react with absorbent, reach desulphurization and denitration, remove the object of bioxin and heavy metal.
2. a kind of semidry method sinter fume integrated purifying method according to claim 1, it is characterized in that, described semi-dry desulphurization system is any in rotary spraying and drying desulphurization system, circulating fluidized bed desulfur system, dense-phase tower method desulphurization system, ENS semi-dry desulphurization system, VAI MEROS desulphurization system and LEC semi-dry desulphurization system.
3. a kind of semidry method sinter fume integrated purifying method according to claim 1, it is characterized in that, described oxidant occurs to be made up of the oxidant generator being connected successively, oxidant thinning tank and oxidizer distributor with distributor, oxidant generator is also connected with recirculating cooling water system and high voltagehigh frequency power supply, before oxidant thinning tank, establish mixing blower fan, oxidizer distributor is located at the oxidant entrance place on the front smoke conveying duct of absorption reaction tower.
4. for realizing the device of a kind of semidry method sinter fume integrated purifying method claimed in claim 1, it is characterized in that, comprise the absorption reaction tower and udst separation and the tapping equipment that connect by smoke conveying duct, described absorption reaction tower connects lime slurry or quick lime preparation and conveying device and fresh water (FW) waterworks in addition, and the flue gas input channel before absorption reaction tower connects in addition oxidant and occurs and distributor.
5. a kind of semidry method sinter fume integrated purifying method according to claim 2, it is characterized in that, the absorption reaction tower of described rotary spraying and drying desulphurization system is rotary spraying and drying desulfurizing tower, and base sinter fume integrated purifying method thereon comprises the steps:
1) from the head flue gas of sintering machine after electric cleaner purifies, drawn by main exhauster exhaust pass, after gas bypass flapper valve and inlet baffle valve switch, enter smoke conveying duct;
2) oxidant generator produces oxidant under the electric discharge of high voltagehigh frequency power supply and recirculating cooling water system acting in conjunction, the air that oxidant and mixing blower fan produce dilutes mixing in oxidant thinning tank, dilute mixed oxidant and spray into smoke conveying duct by the oxidizer distributor being arranged on before absorption reaction tower, react through the NO in the uniform rear oxidation agent of oxidizer distributor and sinter fume, the NO in flue gas is oxidized to NO
2; Press 6:4 proportional diverting with the flue gas after oxidant reaction, carry out, after airflow uniform distribution, entering rotary spraying and drying desulfurizing tower through top smoke distributor and center smoke distributor;
3) quick lime add water be configured to solid content be 20%～25% lime slurry as absorbent, lime slurry and technique temperature lowering water are sent in the slurries top tank that is placed in rotary spraying and drying desulfurizing tower top simultaneously and are diluted, according to SO in flue gas
2with NO
2concentration is determined the addition of lime slurry, determine the addition of temperature lowering water according to flue-gas temperature, lime slurry after mixed diluting is from flowing into rotary atomizer, and lime slurry is atomized into the superfine little droplet of 30～80 μ m by the atomizer of High Rotation Speed, thereby increased SO in absorbent and flue gas
2with NO
2deng the specific area of sour gas contact;
4), in rotary spraying and drying desulfurizing tower, flue gas contacts with the lime slurry of atomization, SO
2with NO
2deng pickling gas and absorbent generation physics, chemical reaction, generate the accessory substances such as calcium sulfate, calcium sulfite, calcium nitrate and calcium nitrite, these accessory substances are about by various particle diameters the dry too cluster of grains powder that 0.05mm particle forms, therefore its specific area is very large, solid granulates surface compared with hightension, the nuisances such as bioxin and heavy metal Hg in flue gas are had to stronger suction-operated, thereby reach desulphurization and denitration, remove the object of bioxin and heavy metal;
5) absorption and sorption SO
2, NO
2the dry powdery particulate fraction of, bioxin, heavy metal is discharged at the bottom of sinking to tower, is regularly transported outward by tank car; All the other particles enter sack cleaner with flue gas discharge rotary spraying and drying desulfurizing tower and further purify and gas solid separation, and clean flue gas is taken out under the effect of drawing and entered atmosphere through outlet damper valve by chimney at booster fan; The dust that sack cleaner is collected is regularly transported outward by tank car.
6. for realizing the device of a kind of semidry method sinter fume integrated purifying method claimed in claim 5, it is characterized in that, comprise that the rotary spraying and drying desulfurizing tower and the bag-type dusting that connect by smoke conveying duct purify and tapping equipment, rotary spraying and drying desulfurizing tower connects lime slurry preparation and conveying device and technique temperature lowering water waterworks in addition, and the flue gas input channel before rotary spraying and drying desulfurizing tower connects in addition oxidant and occurs and distributor.
7. a kind of semidry method sinter fume integrated purifying device according to claim 6, is characterized in that, described smoke conveying duct is provided with inlet baffle valve and by-pass damper valve.
8. a kind of semidry method sinter fume integrated purifying device according to claim 6, is characterized in that, described rotary spraying and drying desulfurizing tower is provided with top smoke distributor, center smoke distributor and rotary atomizer.
9. a kind of semidry method sinter fume integrated purifying device according to claim 6, it is characterized in that, described bag-type dusting purifies and tapping equipment is made up of the sack cleaner connecting successively by pipeline, booster fan and chimney, sets out a mouthful flapper valve on pipeline.
10. a kind of semidry method sinter fume integrated purifying device according to claim 6, it is characterized in that, described oxidant occurs to be stainless steel with pipeline and the equipment of distributor, and the smoke conveying duct inwall that autoxidator entrance rises is laid anti-corrosion material, laying length 1～5m.
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| CN104307325A (en) * | 2014-10-23 | 2015-01-28 | 中国科学院过程工程研究所 | Sintering flue gas integrated type oxidization and denitration device and application thereof |
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Application publication date: 20140820 |