CN104759204A - Boiler flue gas combined demercuration and dearsenification device and removing method thereof - Google Patents
Boiler flue gas combined demercuration and dearsenification device and removing method thereof Download PDFInfo
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- CN104759204A CN104759204A CN201510171475.1A CN201510171475A CN104759204A CN 104759204 A CN104759204 A CN 104759204A CN 201510171475 A CN201510171475 A CN 201510171475A CN 104759204 A CN104759204 A CN 104759204A
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Abstract
The invention discloses a flue gas circulation fluidized bed combined demercuration and dearsenification device and a removing method thereof. The device comprises a coal economizer, a selective catalytic reduction denitrification device, an air preheater, a fluidized bed reactor, a bag type deduster, a desulfurization column and a chimney which are sequentially connected by a flue gas pipeline; a distributary flue gas pipeline and a main flue gas pipeline are arranged in parallel between the coal economizer and the fluidized bed reactor; the main flue gas pipeline is communicated to the bottom end opening of the fluidized bed reactor; the distributary flue gas pipeline is sequentially provided with a hydrogen bromide solution adding branch and an adsorbent adding branch from the coal economizer to the fluidized bed reactor; the tail end of the distributary flue gas pipeline is communicated with the lower part of the fluidized bed reactor via a flue gas spray nozzle; the flue gas spray nozzle is positioned above the bottom end opening of the fluidized bed; an adsorbent recycling mechanism is arranged below the bag type deduster. According to the invention, secondary pollution is not generated; mercury and arsenic removing efficiency is high; the pollution of mercury and arsenic generated by coal combustion flue gas to atmosphere can be prevented effectively.
Description
Technical field
The present invention relates to the flue gas processing device in coal-burning power plant, be particularly a kind ofly applied to flue gas circulating fluidized bed associating demercuration dearsenification device and method.
Background technology
Coal-burning power plant has a large amount of fume emission in operation process, and the discharge of the trace elements such as Hg, As, S in coal-fired flue-gas brings serious threat to the life and health of the mankind and the sustainable development of ecology.Coal fire discharged Hg and As is one of the main source of Hg and As in air, wherein Hg has the features such as strong toxicity, volatile, difficult degradation, easily enrichment in vivo, aerial holdup time long and long-distance migration, it has serious injury to human nervous system, is one of the most serious heavy metal pollution.As has volatility, the arsenic of 1/3 is about had directly volatilization to arrange in people's air in coal, and arsenic has the characteristic being enriched in fine particle, large-scale pollution can be caused by long range propagation, arsenic is one of the most general, material that harmfulness is maximum making people carcinogenic in current environment, and belong to the carcinogen not having threshold value, endanger huge.
In Thermal Power Generation Industry coal used, arsenic content is higher, and be 0.3 ~ 19ppm, arsenic coal can reach the arsenic content of 65ppm; Although the content of mercury in coal, relative to lower arsenic, is generally 0.05 ~ 0.5ppm, because coal consumption is huge, the harm that in coal, the long-term discharge of mercury, arsenic and accumulation produce human body and environment is very large.The production of energy of China based on coal and consumption structure can not change quite over a long time in, and this just determines coal-fired mercury, the arsenic discharged is one of important sources of In The Atmosphere Over China Mercury In Environment and arsenic pollution.Therefore, the analysis and research that system is carried out in the discharge of the mercury produced in coal combustion process and arsenic and Environmental capacity approach are just seemed very necessary and urgent.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of and there is higher demercuration dearsenification efficiency and the flue gas circulating fluidized bed associating demercuration dearsenification device and method of security of system stable operation can be ensured.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
A kind of flue gas circulating fluidized bed associating demercuration dearsenification device, comprise the economizer, selective catalytic reduction denitration device, air preheater, fluidized-bed reactor, sack cleaner, desulfurizing tower and the chimney that connect successively through flue, shunting flue and main flue gas pipeline two-way pipeline is set side by side with between described economizer and fluidized-bed reactor, described main flue gas pipeline communication is to the bottom port of fluidized-bed reactor, and selective catalytic reduction denitration device and air preheater are complied with flow of flue gas direction and be successively set in main flue gas pipeline; Described shunting flue is disposed with hydrogen bromide solution from economizer to fluidized-bed reactor and adds branch road and adsorbent interpolation branch road, the end of shunting flue is communicated with the bottom of fluidized-bed reactor through flue gas nozzle, and flue gas nozzle is positioned at the top of fluidized-bed reactor bottom port; The below of described sack cleaner is provided with the adsorbent recovering mechanism that charging aperture is communicated with sack cleaner, reclaimed materials mouth is communicated with fluidized-bed reactor.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, described hydrogen bromide solution adds branch road and comprises hydrogen bromide fluid reservoir and the first atomizer, and described first atomizer is arranged in shunting flue.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, described adsorbent adds branch road and comprises the storage bin and mixer of milling that are loaded with flying dust and quick lime, described in mixer of milling be arranged in shunting flue.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, the power end of described mixer of milling is connected with Wind energy storage mechanism, described Wind energy storage mechanism comprises vertical axis windmill and energy storage device, the output of vertical axis windmill connects the input of energy storage device, and the output of energy storage device connects the power end of mixer of milling.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, described adsorbent recovering mechanism comprises waterfall streaming powder concentrator, the blower fan be communicated with waterfall streaming powder concentrator and the ash bucket for reclaiming mercury and arsenic; The charging aperture of described waterfall streaming powder concentrator is communicated with the bottom port of sack cleaner through feeding pipe, the discharging opening of waterfall streaming powder concentrator is communicated with ash bucket through discharge pipe, and the reclaimed materials mouth of waterfall streaming powder concentrator is communicated with the inlet end of fluidized-bed reactor through returning charge pipeline.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, the middle part of described fluidized-bed reactor is also communicated with atomized water and adds branch road, and atomized water adds branch road and comprises water tank and the second atomizer, and described second atomizer is arranged on the middle part of fluidized-bed reactor.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, described hydrogen bromide solution adds branch road and is provided with the first valve, the shunting flue front end being positioned at hydrogen bromide solution interpolation branch road is provided with the second valve, adsorbent interpolation branch road is provided with the 3rd valve, atomized water interpolation branch road is provided with the 4th valve.
Above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification device, flue between described sack cleaner and desulfurizing tower is provided with heavy metal on-line computing model, heavy metal on-line computing model is connected with the automatic control system of device through data wire, and the output port of automatic control system is connected with the controlled end of the first valve, the second valve, the 3rd valve and the 4th valve respectively.
A removal methods for flue gas circulating fluidized bed associating demercuration dearsenification, specifically comprises the following steps:
A. divide two-way to export boiler smoke, the bottom port of fluidized-bed reactor is directly sent into through main flue gas pipeline in a road, and the bottom of fluidized-bed reactor is sent into through shunting flue in another road; The volume ratio of described shunting flue gas and main flue gas is 1:600 ~ 1800;
B. in shunting flue gas, add HBr solution, modification is carried out to the flying dust in shunting flue gas; The modified flying dust then carried by shunting flue gas and the quick lime of milling in mixer are mixed into the further modification of row and obtain reacting required adsorbent under the effect of mechanical force; Described modified adsorbent comprises the component of following mass fraction: flying dust 5 ~ 10 parts; Quick lime 1 ~ 3 part: HBr solution 3 ~ 5 parts;
C. in fluidized-bed reactor, atomized water is sprayed;
D. the shunting flue gas with adsorbent, main flue gas and atomized water carry out hybrid reaction in a fluidized bed reactor, are removed the mercury in flue gas, arsenic element by adsorbent.
The removal methods of above-mentioned flue gas circulating fluidized bed associating demercuration dearsenification, described adsorbent comprises the component of following mass ratio: flying dust: quick lime: HBr solution=6:2:3; The mass concentration of described HBr solution is 1% ~ 5%.
Owing to have employed above technical scheme, the invention technological progress is as follows.
The present invention take circulating fluid-bed as the adsorbent equipment of reaction parent, adopt and make adsorbent through the modified flying dust of HBr, quicklime mixture, and adsorbent reusable edible, do not produce secondary pollution, the removal efficiency of mercury and arsenic is high, can effectively prevent the mercury that produces in coal-fired flue-gas and arsenic to the pollution of atmospheric environment; Flying dust in adsorbent can be originated in power plant self flue gas, and atomized water can use desulfurated plaster water, greatly reduces power plant's investment cost, has the good feature of environmental protection and economy.The heavy metal on-line computing model of the present invention also by being arranged on afterbody is measured mercury in flue gas and arsenic concentration and carries out signal feedback, thus control the addition of flying dust, quick lime and HBr, while ensureing demercuration, dearsenification efficiency, reduce the input amount of quick lime and HBr, reduce operating cost.
Flying dust in the present invention removes mainly through physics, chemisorbed mercury and arsenic, and the remove mode of quick lime to mercury is physical absorption and chemisorbed, and is mainly reacted by the oxide of CaO and arsenic arsenic and generate not labile calcium arsenate Ca
3(AsO
4)
2reach removal effect, therefore flying dust and quick lime make adsorbent and can realize removing combining of Hg and As pollutant.Flying dust and quick lime (CaO) are except having good removal effect, cheap in addition, and raw material is easy to obtain, the advantages such as non-secondary pollution.
Increase the HBr aqueous solution in the present invention and can improve flying dust and quick lime (CaO) removal efficiency to mercury and arsenic; Atomizing spray branch road water can from the waste liquid after desulfurated plaster drying, work of water sprinkling for better material moisture is carried out by atomizing water spraying device in circulating fluid bed reactor, be conducive to arsenic by the CaO absorbing and removing in adsorbent, promote that arsenic is to the conversion of calcium arsenate, the process of mercurous waste liquid after simultaneously solving desulfurated plaster drying.The present invention is except can effectively remove except mercury and arsenic, due to quick lime in reactor, the adding of water, also there is certain removal effect to sulfide, both decreased the consumption of desulfurization material in desulfurizing tower, also reduce the discharge capacity of sulfide, improve the economy and the feature of environmental protection run coal-burning power plant.
The present invention adopts modified adsorbent, and adsorption saturation time can be made to extend, and adsorption capacity improves greatly, improves 400 ~ 600 times by initial about 760ng/g, and adopting this adsorbent to carry out the concentration of mercury in flue gas after hybrid reaction to flue gas can by 20ug/m
3drop to 3 ~ 5ug/m
3below, adsorption efficiency reaches more than 75%; In reacted adsorbent, arsenic content increases greatly, is increased to 13.8ug/g by 10.8ug/g.
The accessory substance stability of demercuration of the present invention and dearsenification is high, pollutant should not be separated out, and can not cause secondary pollution, and the accessory substance of demercuration and dearsenification is collected by sack cleaner and is stored in ash bucket, transport as other raw materials of industry by tank car, there is higher popularization and value.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
In figure, each label is expressed as: 1. economizer, 2. hydrogen bromide fluid reservoir, 3. the first valve, 4. the first atomizer, 5. the second valve, 6. vertical axis windmill, 7. energy storage device, 8. storage bin, 9. the 3rd valve, 10. to mill mixer, 11. water tanks, 12. the 4th valves, 13. second atomizers, 14. fluidized-bed reactors, 15. flue gas nozzles, 16. sack cleaners, 17. blower fans, 18. returning charge pipelines, 19. waterfall streaming powder concentrators, 20. ash buckets, 21. heavy metal on-line computing model, 22. desulfurizing towers, 23. chimneys, 24. selective catalytic reduction denitration devices, 25. air preheaters, 26. reative cells.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
As shown in Figure 1, its device comprises the economizer 1, selective catalytic reduction denitration device (SGR) 24, air preheater 25, fluidized-bed reactor 14, sack cleaner 16, desulfurizing tower 22 and the chimney 23 that connect successively through flue to process chart of the present invention; Flue between economizer 1 and fluidized-bed reactor 14 is divided into two-way to export, namely shunting flue and main flue gas pipeline is set side by side with, wherein main flue gas pipeline communication is to the bottom port of fluidized-bed reactor 14, and selective catalytic reduction denitration device 24 and air preheater 25 are complied with flow of flue gas direction and be successively set in main flue gas pipeline; Shunting flue is disposed with hydrogen bromide solution from economizer to fluidized-bed reactor and adds branch road, adsorbent interpolation branch road and atomized water interpolation branch road, the end of shunting flue is communicated with the bottom of fluidized-bed reactor through flue gas nozzle 15, and flue gas nozzle 15 is positioned at the top of fluidized-bed reactor bottom port; The shunting flue front end being positioned at economizer output port side is provided with the second valve, for controlling the flow shunting flue gas in flue; The below of sack cleaner 16 is provided with adsorbent recovering mechanism.
Hydrogen bromide solution adds branch road and is used for spraying hydrogen bromide solution, to carry out modification to the flying dust in adsorbent in shunting flue gas.Hydrogen bromide solution adds branch road and comprises hydrogen bromide fluid reservoir 2, first valve 3, first atomizer 4 and reative cell 26, and reative cell is arranged in shunting flue, and the first atomizer is arranged in reative cell.What in the present invention, the position of hydrogen bromide fluid reservoir 2 can be arranged is higher, with the gravity head utilizing hydrogen bromide solution larger, sprays in the shunting flue in reative cell successively through the first valve and the first atomizer, carries out modification to the flying dust in shunting flue gas.First valve is for controlling the addition of hydrogen bromide solution.HBr solution relies on self gravitation to flow in flue, can avoid using station service to carry out transport of H Br solution, effectively reduces station service power consumption rate, has saved operating cost.
Adsorbent adds branch road and is used for adding adsorbent in shunting flue, in the present invention, adsorbent comprises flying dust and quick lime, flying dust raw material obtains primarily of in shunting flue gas, and also can obtain by ash bucket time not enough, quick lime can be prepared by the method for calcined limestone.Adsorbent adds branch road and comprises the storage bin 8, the 3rd valve and the mixer 10 of milling that are loaded with flying dust and quick lime, and mixer 10 of milling is arranged in shunting flue.
The power end of mixer 10 of milling is connected with Wind energy storage mechanism, described Wind energy storage mechanism comprises vertical axis windmill 6 and energy storage device 7, the output of vertical axis windmill 6 also connects the input of energy storage device 7, and the output of energy storage device connects the power end of mixer 10 of milling.When high wind weather, vertical axis windmill 6 mills mixer 10 normally except work except drive, also can be able to be stored in energy storage device 7 by electricity; When wind-force is less be not enough to only to rely on vertical axis windmill 6 to drive mixer 10 of milling to work time, energy storage device 7 can be used as stand-by power supply and drives mixer 10 of milling to work on.The present invention utilizes wind-driven generator as the power driving mixer of milling, the wind energy making full use of the Nature drives the grinding roller of milling in mixer to rotate mill stirring flying dust and quick lime, can well wind energy be utilized, reduce station service power consumption rate, saved operating cost greatly.After mixer of milling stirs, can obtain flying dust and quick lime powder that particle diameter is less than 35 orders (namely particle diameter is less than 0.5mm), the component as adsorbent is carried in feeding fluidized-bed reactor through shunting flue gas.
Atomized water adds branch road and comprises water tank 11, the 4th valve and the second atomizer, and the second atomizer is arranged on the middle part of fluidized-bed reactor 14, for spraying atomized water in fluidized-bed reactor.
Adsorbent recovering mechanism for separating of going out mercury and arsenic, and reclaims adsorbent.Comprise waterfall streaming powder concentrator 19, blower fan 17 and ash bucket 20; Blower fan is communicated with waterfall streaming powder concentrator, and waterfall streaming powder concentrator, under fan action, is separated with the adsorbent of arsenic containing mercury.The charging aperture of waterfall streaming powder concentrator 19 is communicated with through the bottom port of feeding pipe with sack cleaner 16, and the discharging opening of waterfall streaming powder concentrator 19 is communicated with ash bucket 20 through discharge pipe, for reclaiming mercury and arsenic; The reclaimed materials mouth of waterfall streaming powder concentrator 19 is communicated with the inlet end of fluidized-bed reactor through returning charge pipeline 18, realizes the screening of quick lime and flying dust and recycles, and solves quick lime raw material dosage large, the problem that cost is high, reduces the operating cost of system.In the present invention, waterfall streaming powder concentrator selects PL type waterfall streaming powder concentrator, PL type waterfall streaming powder concentrator is a kind of static powder separating machine, inner no-rotary part, mainly be made up of the screen arranged in trapezoidal shape, treat that the material of sorting is wandered in echelon on one group of step, step has sorting air-flow pass through, mercury and arsenic are separated by air-flow from adsorbent, and are transported to discharging opening; PL type waterfall streaming powder concentrator has grain diameter regulatory function, can regulate the modification flying dust recycled, quick lime mixed adsorbent particle diameter by regulating sorting air-flow according to actual conditions, isolate the mercurous and dust compared with small particle diameter that is arsenic, thus improve reaction efficiency.
The flue of the present invention between sack cleaner 16 and desulfurizing tower 22 is also provided with heavy metal on-line computing model 21, heavy metal on-line computing model 21 is connected with the automatic control system of device through data wire, and the output port of automatic control system is connected with the controlled end of the first valve, the second valve, the 3rd valve and the 4th valve respectively.Heavy metal on-line computing model 21 is for monitoring the size of mercury in tail flue gas, arsenic concentration, in the tail flue gas that automatic control system then records according to heavy metal on-line computing model, the content of heavy metal regulates the aperture size of the first valve, the second valve, the 3rd valve successively, thus the adjustment realized flying dust, quick lime and hydrogen bromide solution feeding coal, to guarantee the concentration of mercury in flue gas, arsenic two kinds of polluters to control within zone of reasonableness.4th valve is then for controlling the spray flux of water.
The removal methods of flue gas circulating fluidized bed associating demercuration dearsenification, specifically comprises the following steps:
A. boiler smoke divides two-way to export, and the bottom port of fluidized-bed reactor is directly sent into through main flue gas pipeline in a road, and the bottom of fluidized-bed reactor is sent into through shunting flue in another road; The volume ratio of described shunting flue gas and main flue gas is 1:600 ~ 1800.
B. in shunting flue gas, add HBr solution and carry out modification to the flying dust in flue gas, the modified flying dust then carried by shunting flue gas and the quick lime of milling in mixer are mixed into the further modification of row and obtain reacting required adsorbent under the effect of mechanical force; The quick lime feeding coal added in mixer of milling is 10 ~ 30kg/h.
The modified adsorbent finally obtained comprises the component of following mass fraction: flying dust 5 ~ 10 parts; Quick lime 1 ~ 3 part: HBr solution 3 ~ 5 parts.
The component of the preferred following mass ratio of adsorbent of the present invention:
Flying dust: quick lime: HBr solution=6:2:3; The mass concentration of described HBr solution is 1% ~ 5%.
The flying dust that flying dust in adsorbent carries primarily of flue gas in shunting flue gas pipeline obtains, and when shunting the flying dust in flue gas and being not enough, can obtain by ash bucket.HBr solution in shunting flue gas first with the flying dust generation chemical reaction (acidifying and introduce bromide ion) in flue gas; Then shunting the flying dust in flue gas and the flying dust in adsorbent and quick lime milling under the effect in mechanical force in mixer mixes, and increases specific area, thus adds reactivity; Finally brought into circulating fluid bed reactor by shunting flue gas stream.
The adsorption mechanism of adsorbent is: fly ash granule comprises porous vitreum two class of porous carbon granules and melting, and porous carbon granules has large specific area but content is few, and cellular glass body burden is large but specific area is less, and absorption property is less.Because hole is exposed to surface, blind bore cave need be opened by physics or chemical method, to improve its porosity and specific area, improve Adsorption of Heavy Metals ability.And HBr and quick lime (CaO) can destroy the rigid shell on fly ash granule surface, more reaction active site is come out, open the hole that fly ash granule is closed, increase its specific area, promote that the active site position of more demercuration dearsenifications participates in reaction.
Containing a large amount of SiO in flying dust
2, Al
2o
3, Fe
2o
3, the inorganic oxide composition such as MgO, CaO and unburnt carbon have catalysed oxidn and suction-operated to Hg0, under the modifying function of certain density HBr solution (1% ~ 5%), can improve flying dust further to the adsorption efficiency of mercury and adsorption capacity; Ferriferous oxide can be converted into bivalent mercury by catalyze elemental mercury, thus promotes removing of mercury; Iron content also plays facilitation compared with the oxide of Gao Shitie to removing of arsenic, and generate ferric arsenate, when calcium content is higher, arsenic mainly removes with the form of calcium arsenate.Reaction mechanism is as follows, wherein M
xo
yrepresent various inorganic oxide:
As SiO in flyash ingredient
2+ Al
2o
3+ Fe
2o
3during > 80 %, after adopting HBr solution modification, removal of mercury effect of removing arsenic is best.
Can improve the specific area of flying dust after CaO process, and destroy the rigid shell on fly ash granule surface, Si ~ O key that namely flying dust is inner a large amount of, makes vitreous surface solable matter and Ca (OH)
2reaction generates gum material, and makes the mullite in flyash and the melting of amorphous glassy phase, thus improves the activity of flyash.
C. in fluidized-bed reactor, spray atomized water, the quality of atomized water be flue gas gross mass ten thousand/.
The atomized water sprayed into by atomizing water spraying device in HBr solution and circulating fluid bed reactor, can make modified flying dust and quick lime mixed adsorbent that certain reunion occurs, and generate slightly soluble liquid zone at adsorbent surface, reduce flue gas adsorption reaction activation energy, promote the absorption of mercury and arsenic, and be conducive to removing a part of SO
2.The absorbent particles increased of simultaneously reuniting can recycle in circulating fluid bed reactor, increases flue gas and adsorbent contact time, increases the utilization rate of adsorbent, reduces costs.
D. the shunting flue gas with adsorbent, main flue gas and atomized water carry out hybrid reaction in a fluidized bed reactor, are removed the mercury in flue gas, arsenic element by adsorbent.The effect of circulating fluid bed reactor is prolong smoke and flying dust and adsorbent contact time, improves adsorbent capacity.
Concrete technology flow process of the present invention is as follows.
Boiler smoke point two-way after economizer exports, the bottom port of fluidized-bed reactor is directly sent into through main flue gas pipeline in one tunnel, the bottom of fluidized-bed reactor is sent into through shunting flue in another road, shunting flue is communicated with fluidized-bed reactor the top that position is positioned at fluidized-bed reactor bottom port, to ensure, on the flue gas that the adsorbent sprayed from shunt conduit can be sprayed in main flue gas pipeline feeding fluidized-bed reactor, to carry out demercuration dearsenification process to flue gas.
Flue gas in shunting flue is adding branch road through hydrogen bromide solution, the flying dust carried in flue gas is entered adsorbent while hydrogen bromide solution modification adds and mills in mixer in branch road, and mixer of milling receives the quick lime and modified flying dust co-ground that storage bin sends into simultaneously.
In operation process, vertical axis windmill 6 produces rotation under wind action, drives the grinding roller of mixer 10 of milling to rotate, thus the flying dust of milling in mixer 10, quick lime and the HBr solution that sprays into are stirred by rotary action.Mill flying dust in mixer 10 after HBr solution modification, quick lime mixed adsorbent is taken away by the flue gas stream shunted, and is delivered in circulating sulfuration bed bioreactor 14 through flue gas nozzle 15.
In a fluidized bed reactor, the main flue gas that self-fluidized type bed bioreactor bottom port is sent into carries out abundant hybrid reaction with the shunting flue gas containing adsorbent sent into from fluidized-bed reactor lower hopper shape wall and the atomized water that sprayed into by the sidewall of fluidized-bed reactor, and after carry out dust removal process through flue feeding sack cleaner.
Waterfall streaming powder concentrator below sack cleaner by having adsorbed mercury, the ultra-fine ash of arsenic is separated with larger particles adsorbent, wherein ultra-fine ash sends into ash bucket through discharge pipe, and absorbent particles is sent into fluidized-bed reactor through returning charge pipeline and reused.
Flue gas after dedusting carries out after desulfurization process through smoke stack emission through flue feeding desulfurizing tower.The heavy metal on-line computing model 21 that the flue of sack cleaner flue gas delivery outlet is arranged is for monitoring the size of mercury in tail flue gas, arsenic concentration, the data recorded are sent in automatic control system by heavy metal on-line computing model 21, automatic control system regulates in conjunction with the aperture size of standard limit of smog release to the first valve, the second valve, the 3rd valve again, the feeding coal of further adjustment flying dust, quick lime and HBr solution, makes the mercury in the flue gas of discharge, the concentration of arsenic two kinds of polluters meets standard limit of smog release.
Below in conjunction with specific embodiment, by carrying out the addition of component each in adsorbent changing the removal of mercury effect of removing arsenic that adsorbent is described.The HBr solution of different quality concentration can be taked in the following embodiments to carry out modification to flying dust and quick lime, and the concentration of HBr solution is 1% ~ 5%, sprays into CaO quality in adsorbent and changes between 4 ~ 30kg/h.
Corresponding to 600MW coal unit, Mercury In Coal Combustion Flue Gas concentration is 20 μ g/m
3.
Embodiment 1: in the device course of work, in shunting flue gas, the HBr solution of 1% is sprayed into by the straying quatity of 15 ~ 45kg/h, the ash content control that flies that shunting flue gas carries is 30kg/h ~ 90kg/h, spray into CaO quality in adsorbent and reach 10 ~ 30kg/h, atomizing spray amount be flue gas total mass flow rate ten thousand/for the moment, removal of mercury arsenic removal efficiency of the present invention can reach more than 75% ~ 90%.
Embodiment 2: spray into the HBr solution of 3% by the straying quatity of 15 ~ 45kg/h in shunting flue gas, the ash content control that flies that shunting flue gas carries is 30kg/h ~ 90kg/h, spray into CaO quality in adsorbent and reach 10 ~ 30kg/h, atomizing spray amount be flue gas total mass flow rate ten thousand/for the moment, removal of mercury arsenic removal efficiency of the present invention can reach more than 80% ~ 95%.
Embodiment 3: spray into the HBr solution of 3% by the straying quatity of 6 ~ 15 kg/h in shunting flue gas, the ash content control that flies that shunting flue gas carries is 12kg/h ~ 30kg/h, spray into CaO quality in adsorbent and reach 4 ~ 10kg/h, atomizing spray amount be flue gas total mass flow rate ten thousand/for the moment, removal of mercury arsenic removal efficiency of the present invention can reach more than 75% ~ 85%.
Embodiment 4: spray into the HBr solution of 5% by the straying quatity of 6 ~ 15 kg/h in shunting flue gas, the ash content control that flies that shunting flue gas carries is 12kg/h ~ 30kg/h, spray into CaO quality in adsorbent and reach 4 ~ 10kg/h, atomizing spray amount be flue gas total mass flow rate ten thousand/for the moment, removal of mercury arsenic removal efficiency of the present invention can reach more than 80% ~ 95%.
Embodiment 5: spray into the HBr solution of 5% by the straying quatity of 15 ~ 45kg/h in shunting flue gas, the ash content control that flies that shunting flue gas carries is 30kg/h ~ 90kg/h, spray into CaO quality in adsorbent and reach 10 ~ 30kg/h, atomizing spray amount be flue gas total mass flow rate ten thousand/for the moment, removal of mercury arsenic removal efficiency of the present invention can reach more than 90% ~ 98%.
Claims (10)
1. a flue gas circulating fluidized bed associating demercuration dearsenification device, comprise the economizer (1) connected successively through flue, selective catalytic reduction denitration device (24), air preheater (25), fluidized-bed reactor (14), sack cleaner (16), desulfurizing tower (22) and chimney (23), it is characterized in that: between described economizer (1) and fluidized-bed reactor (14), be set side by side with shunting flue and main flue gas pipeline two-way pipeline, described main flue gas pipeline communication is to the bottom port of fluidized-bed reactor (14), selective catalytic reduction denitration device (24) and air preheater (25) are complied with flow of flue gas direction and are successively set in main flue gas pipeline, be disposed with hydrogen bromide solution from economizer to fluidized-bed reactor in described shunting flue and add branch road and adsorbent interpolation branch road, the end of shunting flue is communicated with the bottom of fluidized-bed reactor through flue gas nozzle (15), and flue gas nozzle (15) is positioned at the top of fluidized-bed reactor bottom port, the below of described sack cleaner (16) is provided with the adsorbent recovering mechanism that charging aperture is communicated with sack cleaner, reclaimed materials mouth is communicated with fluidized-bed reactor.
2. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 1, it is characterized in that: described hydrogen bromide solution adds branch road and comprises hydrogen bromide fluid reservoir (2) and the first atomizer (4), described first atomizer (4) is arranged in shunting flue.
3. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 2, it is characterized in that: described adsorbent adds branch road and comprises the storage bin (8) and mixer of milling (10) that are loaded with flying dust and quick lime, described in mixer (10) of milling be arranged in shunting flue.
4. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 3, is characterized in that: described adsorbent recovering mechanism comprises waterfall streaming powder concentrator (19), the blower fan (17) be communicated with waterfall streaming powder concentrator and the ash bucket (20) for reclaiming mercury and arsenic; The charging aperture of described waterfall streaming powder concentrator (19) is communicated with through the bottom port of feeding pipe with sack cleaner (16), the discharging opening of waterfall streaming powder concentrator (19) is communicated with ash bucket (20) through discharge pipe, and the reclaimed materials mouth of waterfall streaming powder concentrator (19) is communicated with the inlet end of fluidized-bed reactor through returning charge pipeline (18).
5. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 4, it is characterized in that: the middle part of described fluidized-bed reactor (14) is also communicated with atomized water and adds branch road, atomized water adds branch road and comprises water tank (11) and the second atomizer (13), and described second atomizer (13) is arranged on the middle part of fluidized-bed reactor (14).
6. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 5, it is characterized in that: described in the mill power end of mixer (10) be connected with Wind energy storage mechanism, described Wind energy storage mechanism comprises vertical axis windmill (6) and energy storage device (7), the output of vertical axis windmill (6) connects the input of energy storage device (7), and the output of energy storage device connects the power end of mixer (10) of milling.
7. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 6, it is characterized in that: described hydrogen bromide solution adds branch road and is provided with the first valve (3), the shunting flue front end being positioned at hydrogen bromide solution interpolation branch road is provided with the second valve (5), adsorbent interpolation branch road is provided with the 3rd valve (9), atomized water interpolation branch road is provided with the 4th valve (12).
8. flue gas circulating fluidized bed associating demercuration dearsenification device according to claim 7, it is characterized in that: the flue between described sack cleaner (16) and desulfurizing tower (22) is provided with heavy metal on-line computing model (21), heavy metal on-line computing model (21) is connected with the automatic control system of device through data wire, and the output port of automatic control system is connected with the controlled end of the first valve (3), the second valve (5), the 3rd valve (9) and the 4th valve (12) respectively.
9. use a removal methods for associating demercuration dearsenification device as flue gas circulating fluidized bed in any one of claim 1-8, it is characterized in that, carry out according to the following steps:
A. divide two-way to export boiler smoke, the bottom port of fluidized-bed reactor is directly sent into through main flue gas pipeline in a road, and the bottom of fluidized-bed reactor is sent into through shunting flue in another road; The volume ratio of described shunting flue gas and main flue gas is 1:600 ~ 1800;
B. in shunting flue gas, add HBr solution, modification is carried out to the flying dust in shunting flue gas; The modified flying dust then carried by shunting flue gas and the quick lime of milling in mixer are mixed into the further modification of row under the effect of mechanical force, obtain reacting required adsorbent; Described modified adsorbent comprises the component of following mass fraction: flying dust 5 ~ 10 parts; Quick lime 1 ~ 3 part: HBr solution 3 ~ 5 parts;
C. in fluidized-bed reactor, atomized water is sprayed;
D. the shunting flue gas with adsorbent, main flue gas and atomized water carry out hybrid reaction in a fluidized bed reactor, are removed the mercury in flue gas, arsenic element by adsorbent.
10. the removal methods of flue gas circulating fluidized bed associating demercuration according to claim 9 dearsenification, is characterized in that: described adsorbent is the component of following mass ratio:
Flying dust: quick lime: HBr solution=6:2:3; The mass concentration of described HBr solution is 1% ~ 5%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107096366A (en) * | 2017-06-20 | 2017-08-29 | 佛山市三水新明珠建陶工业有限公司 | Gravity flow SNCR denitration system |
| CN107930579A (en) * | 2017-11-29 | 2018-04-20 | 安徽工业大学 | A kind of adsorbent and its arsenic removing method for flue gas dearsenification |
| CN114028904A (en) * | 2021-11-05 | 2022-02-11 | 国能国华(北京)电力研究院有限公司 | Flue gas treatment system |
| CN115014050A (en) * | 2021-03-03 | 2022-09-06 | 上海交通大学 | Agricultural product low-temperature adsorption drying and heat pump desorption coupling system and method for using same |
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2015
- 2015-04-13 CN CN201510171475.1A patent/CN104759204B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107096366A (en) * | 2017-06-20 | 2017-08-29 | 佛山市三水新明珠建陶工业有限公司 | Gravity flow SNCR denitration system |
| CN107930579A (en) * | 2017-11-29 | 2018-04-20 | 安徽工业大学 | A kind of adsorbent and its arsenic removing method for flue gas dearsenification |
| CN107930579B (en) * | 2017-11-29 | 2020-12-25 | 安徽工业大学 | Adsorbent for removing arsenic from flue gas and arsenic removing method thereof |
| CN115014050A (en) * | 2021-03-03 | 2022-09-06 | 上海交通大学 | Agricultural product low-temperature adsorption drying and heat pump desorption coupling system and method for using same |
| CN114028904A (en) * | 2021-11-05 | 2022-02-11 | 国能国华(北京)电力研究院有限公司 | Flue gas treatment system |
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