CN101597070A - Sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process and method - Google Patents

Sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process and method Download PDF

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Publication number
CN101597070A
CN101597070A CNA2009100629690A CN200910062969A CN101597070A CN 101597070 A CN101597070 A CN 101597070A CN A2009100629690 A CNA2009100629690 A CN A2009100629690A CN 200910062969 A CN200910062969 A CN 200910062969A CN 101597070 A CN101597070 A CN 101597070A
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case
ammonia
flue gas
ammoniumsulphate soln
pelletizing
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CN101597070B (en
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朱俊杰
孙晓
罗万钢
冯斌
李宁
游学明
张伏生
刘程
金鑫
刘科勤
丛元元
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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Abstract

The device and method that the flue gas that the present invention relates to produce in a kind of metallurgical industry sintering, pelletizing and the stove technology is purified with ammonia process of desulfurization after product ammoniumsulphate soln.Purifying plant comprises adjust pH case 1, centrifugal separation unit, adjust pH case 1 and centrifugal separation unit pass through pipe connection, transfering material pump 4 is set on connecting tube, connects aerator 3 in the bottom of adjust pH case 1, centrifugal separation unit is a horizontal spiral discharge sedimentation centrifuge 2.The present invention utilizes ammoniacal liquor in the ammonia desulfurizing process as the pH regulator agent and the metal ion remover of ammoniumsulphate soln, adopt the method for aeration, chemical neutralization precipitation and physics centrifugation that ammoniumsulphate soln is purified, purifying plant is simple in structure, economic and practical, ammoniumsulphate soln after the separation is by after the condensing crystal drying, and quality can reach the above requirement of salable product in the national ammonium sulfate standard " GB535-1995 ".

Description

Sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process and method
Technical field
The device and method that the flue gas that the present invention relates to produce in a kind of metallurgical industry sintering, pelletizing and the stove technology is purified with ammonia process of desulfurization after product ammoniumsulphate soln.
Background technology
Since the nineties in 20th century, China Steel industry is rapidly developed, and continuous 13 years crude steel output of China ranks first in the world.Rapid growth along with China's national economy, Iron And Steel Industry will sustainable development in quite long one period, but owing in the smelting iron and steel production process, can consume a large amount of fuel and ore, produce a large amount of atmospheric polluting materials, load to environment constantly increases the weight of, and this has become one of bottleneck of restriction sustainable development of iron and steel industry.At present, the SO of steel industry 2Account for about 11% of national every profession and trade quantity discharged etc. the Air Pollutant Emission amount, be only second to power industry, occupied the 2nd.The dust, the SO that produce of pelletizing, sintering process process wherein 2, CO 2Account for 40%～60% of steel industry annual emissions Deng discharge amount of pollution.Therefore, sintering, pelletizing and metallurgical furnace kiln flue gas are carried out SO 2Administer to the Sustainable development of metallurgy industry and to improve the ecological environment and have great importance Deng pollutant emission.
The situation that current domestic sintering, pelletizing and stove smoke gas treatment present multiple technologies and deposits mainly contains ammonia-ammonia sulfate method, limestone-gypsum method, circulating fluidized bed method, ionic liquid method etc.Wherein in the ammonia-process desulfurization technique technical process, the desulfurization after product is an ammonium sulfate fertilizer, and its working cost can be sold significantly by after product and reduce, and is particularly suitable for the road of metallurgy industry recycling economy development.
The ammonia process technology of using both at home and abroad mainly contains following technological line at present:
(1) Walther ammonia process technology
Wet method ammoniacal liquor sulfur removal technology is to develop the technology in the ammonia process Walther of the seventies and eighties by Ke Lubai (krupp kroppers) company the earliest.Flue gas after the dedusting enters washing tower earlier through over-heat-exchanger from the top, and with ammonia (25%) and stream and descend, ammoniacal liquor falls into the pond, sprays flue gas with pump suction absorption tower internal recycle.Flue gas then enters a high-efficient washing tower behind mist eliminator, remaining salts solution is washed out, after the cleaning flue gases after the heat exchanger heats enters chimney.
(2) AMASOX ammonia process technology
One of subject matter that traditional ammonia process technology runs into is to exist the aerosol problem not to be resolved in the flue gas after being purified.Can Jie Si-Bi Xiaofu company traditional ammonia process have been carried out transformation and improve be the AMASOX method.The main improvement is to change traditional multitower single tower of compact construction into and settle the wet type electrostatic precipitator to solve the aerosol problem in tower.
(3) GE ammonia process technology
The nineties, the GE company of the U.S. has also developed ammonia process technology, this technical process is: the flue gas after the dedusting is drawn behind boiler of power plant, behind interchanger, enter the cooling of refrigerating unit high-pressure spraying water smoke, dedusting (removing remaining flue dust), be cooled to enter into again in the absorption washing tower near saturated and clean flue gas dew-point temperature.Be furnished with two sections in the absorption tower and absorb scrubber layer, make washings and flue gas be able to mixed fully the contact, after the wet electrical dust precipitator demist of the flue gas after the desulfurization in tower, enter interchanger again and heat up, reach emission standard after chimney enters atmosphere.The washings that contains ammonium sulfate after the desulfurization forms after product ammonium sulfate through crystal system.
(4) NKK ammonia process
The NKK ammonia process is the technology of NKK's exploitation.This absorption tower has certain characteristics, divides three sections.From the bottom up, hypomere is pre-wash dedusting and cold shock cooling, in this section, does not have the adding of absorption agent.The stage casing is first absorber portion, and absorption agent from then on section adds.Epimere does not still add absorption agent as second absorber portion, only adds process water.The flue gas heater via that absorbs after handling heats up back row to chimney.The ammonium sulfurous oxidation is carried out in independent oxidation reactor.The oxygen that needs is replenished by pressurized air, and the oxidation residual gas is arranged to the absorption tower.
Above-mentioned multiple ammonia desulfurizing process is when metallurgy industry is used, owing to contain metal ingredient and dust such as more iron (mainly based on trivalent), copper, manganese, zinc, mercury, chromium, lead, aluminium in sintering, pelletizing and the stove flue gas, directly cause after product ammonium sulfate quality lower.
Ammonia-process desulfurization technique is continued to use the power industry sulfur method more when removing mentioned component both at home and abroad at present, based on single one physical filter types such as strainer or whizzers, can not solve the ammonium sulfate quality problem at all.
Summary of the invention
The objective of the invention is in order to overcome existing sintering, pelletizing, the low problem of stove flue gas employing ammonia process of desulfurization after product ammonium sulfate quality, a kind of purifying device of ammonium sulphate solution and method are provided, impurity such as metal in the ammoniumsulphate soln and dust are separated, made metallurgy industry sintering and pelletizing produced by flue gas desulfurization by ammonia process ammonium sulfate quality reach the above requirement of salable product in the national ammonium sulfate standard " GB535-1995 ".
The object of the invention realizes by following technical solution:
Dust complicated component in sintering, pelletizing and the stove flue gas, in the ammonia desulfurizing process process, in the after product ammoniumsulphate soln, bring metal ingredients such as more dust and iron, copper, manganese, zinc, mercury, chromium, lead, aluminium inevitably into, influence the quality of ammonium sulfate crystallization.(NH in the ammonia process of desulfurization tower 4) 2SO 3-(NH 4) 2SO 4Circulation fluid is after the aeration oxidation, and pH value is generally about 2～5.5 according to the operational path difference in the tower.Metal ingredients such as iron, copper, manganese, zinc, mercury, arsenic, lead, aluminium generally exist with the dissolved salt form, and the solution metal composition generally has: Fe 2+, Fe 3+, Cu 2+, Mn 2+, Zn 2+, Hg 2+, Cr 3+, Pb 2+, Al 3+, Ca 2+, Na +, K +Deng.
For removing metal ion and the dust in sintering, pelletizing and the stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process, purifying plant provided by the invention, comprise and transfer pH value case, centrifugal separation unit, transfer pH value case and centrifugal separation unit to pass through pipe connection, transfering material pump is set on connecting tube, connect aerator in the bottom of transferring the pH value case, centrifugal separation unit is a horizontal spiral discharge sedimentation centrifuge.
Adopt purifying plant of the present invention, the method to sintering, pelletizing and stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process are purified comprises the steps:
1. the ammoniumsulphate soln that generates in sweetening process of ammonia process of desulfurization tower enters by pipeline and transfers the pH value case, is transferring pH value case bottom to blast air by aerator, and the purpose of aeration is to utilize airborne oxygen with the Fe in the ammoniumsulphate soln 2+Be oxidized to Fe 3+, form Fe (OH) 3Precipitation.Has the effect of stirring average simultaneously.The chemical reaction that takes place is:
Fe 2++O 2+H 2O→Fe(OH) 3↓
2. in aeration, in transferring the pH value case, add the ammoniacal liquor that the ammonia process of desulfurization is used, will transfer the interior ammoniumsulphate soln pH value of pH value case to be adjusted into 7～8 by pipeline.At this moment, in solution, will take place below the reaction:
Fe 3++3OH -＝Fe(OH) 3↓
Cu 2++2OH -＝Cu(OH) 2↓
Zn 2++2OH -＝Zn(OH) 2↓
Pb 2++2OH -＝Pb(OH) 2↓
Al 3++3OH -＝Al(OH) 3↓
Cr 3++3OH -＝Cr(OH) 3↓
3. by after transferring pH value and stirring, most metal all can form precipitation of hydroxide and separate out.And then by transferring pH value case transfering material pump and pipeline will transfer the ammoniumsulphate soln of pH value to be driven in the horizontal spiral discharge sedimentation centrifuge.
4. by the effect of horizontal spiral discharge sedimentation centrifuge, the precipitate metal hydroxides and the dust of the different-grain diameter in the ammoniumsulphate soln can be isolated, the ammoniumsulphate soln quality can be improved.
5. the ammoniumsulphate soln of isolating precipitate metal hydroxides and dust enters the finished product case, pH value is an alkalescence in the ammonium sulfate finished product case at this moment, can transfer pH value again by the phlegma that adds in dilute sulphuric acid or the follow-up ammonium sulfate concentration and crystallization process, the pH value requirement is driven in the follow-up condensing crystal drying process by ammonium sulfate finished product case pump and pipeline then when making it to meet follow-up ammonium sulfate condensing crystal.
Horizontal spiral discharge sedimentation centrifuge can efflux waste residue in deimpurity process, main component is the precipitated metal thing in these waste residues, and after can collecting by collection device, special project is disposed or turned back to utilization again in sintering or the pelletizing process according to its composition.
The invention has the beneficial effects as follows: the present invention utilizes ammoniacal liquor in the ammonia desulfurizing process as the PH conditioning agent and the metal ion remover of ammoniumsulphate soln, adopt the method for aeration, chemical neutralization precipitation and physics centrifugation that sintering, pelletizing and stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process are purified, purifying plant is simple in structure, economic and practical, can efficiently remove various metal ingredients and dust in the metallurgy industry sinter machine pelletizing ammonium sulphate solution produced by flue gas desulfurization by ammonia process.Ammoniumsulphate soln after the separation is by after the condensing crystal drying, and quality can reach the above requirement of salable product in the national ammonium sulfate standard " GB535-1995 ".
Description of drawings
Fig. 1 flash trapping stage purifying plant of the present invention figure
Fig. 2 secondary of the present invention separates purifying plant figure
1. transfer pH value case, 2. horizontal spiral discharge sedimentation centrifuge, 3. aerator, 4. transfering material pump, 5. finished product case, 6. agitator, 7. removing heavy metals case, 8. horizontal spiral discharge sedimentation centrifuge, 9. transfering material pump among the figure.
Embodiment
The present invention is described further below in conjunction with accompanying drawing:
Sintering, pelletizing or stove smoke components change along with the variation of raw material, in actual engineering, when heavy metal concentration in the flue gas is low, adopt as shown in Figure 1 flash trapping stage purifying plant can make in the ammoniumsulphate soln metal ingredient and dust remove up to standard, this one-level purifying plant comprises transfers pH value case 1, horizontal spiral discharge sedimentation centrifuge 2, transfer pH value case 1 and horizontal spiral discharge sedimentation centrifuge 2 to pass through pipe connection, transfering material pump 4 is set on connecting tube, connect aerator 3 in the bottom of transferring pH value case 1, the outlet of horizontal spiral discharge sedimentation centrifuge 2 is connected with finished product case 5 by pipeline, establishes agitator in transferring pH value case 1 and finished product case 5.
Adopt the method for purification of one-level purifying plant as follows:
1. aerator 3 is to transferring pH value case 1 to blast air;
2. in transferring pH value case 1, add the used ammoniacal liquor of the ammonia process of desulfurization, will transfer pH value case 1 interior ammoniumsulphate soln pH value to be adjusted into 7～8;
3. transfering material pump 4 will transfer in the pH value case 1 ammoniumsulphate soln to squeeze into horizontal spiral discharge sedimentation centrifuge 2;
4. horizontal spiral discharge sedimentation centrifuge 2 is isolated precipitate metal hydroxides and the dust in the ammoniumsulphate soln;
5. the ammoniumsulphate soln of isolating precipitate metal hydroxides and dust enters finished product case 5.
When the heavy metal constituent concentration is higher in the flue gas, because the regulation range of pH value is between 7～8, after isolating most metal ion, in solution, still has some metal ions and can't be completed into precipitation of hydroxide and removed, mainly contain Mn 2+, Zn 2+, Cu 2+, Pb 2+Deng, adopt secondary as shown in Figure 2 to separate purifying plant, can further remove heavy metal ion.Secondary separates purifying plant and comprises accent pH value case 1, one-level horizontal spiral discharge sedimentation centrifuge 2, removing heavy metals case 7, secondary horizontal spiral discharge sedimentation centrifuge 8.Transfer pH value case 1 and one-level horizontal spiral discharge sedimentation centrifuge 2 to pass through pipe connection, transfering material pump 4 is set on connecting tube, connect aerator 3 in the bottom of transferring pH value case 1, the outlet of one-level horizontal spiral discharge sedimentation centrifuge 2 is connected with removing heavy metals case 7 by pipeline, 7 outlets of removing heavy metals case are connected with secondary horizontal spiral discharge sedimentation centrifuge 8 by the transfering material pump 9 that is provided with on pipeline and the pipeline, the outlet of secondary horizontal spiral discharge sedimentation centrifuge 8 is connected with finished product case 5 by pipeline and pump, establishes agitator in transferring pH value case 1, removing heavy metals 7, finished product case 5.
Adopt the method for purification of secondary purifying plant as follows:
1. aerator 3 is to transferring pH value case 1 to blast air;
2. in transferring pH value case 1, add the used ammoniacal liquor of the ammonia process of desulfurization, will transfer pH value case 1 interior ammoniumsulphate soln pH value to be adjusted into 7～8;
3. transfering material pump 4 will transfer in the pH value case 1 ammoniumsulphate soln to squeeze into horizontal spiral discharge sedimentation centrifuge 2;
4. horizontal spiral discharge sedimentation centrifuge 2 is isolated precipitate metal hydroxides and the dust in the ammoniumsulphate soln;
5. the ammoniumsulphate soln of isolating precipitate metal hydroxides and dust enters removing heavy metals case 7, adds the sulfide heavy metal remover in removing heavy metals case 7, makes heavy metal form the metal sulphide precipitation and separates out;
The main reaction that takes place is:
Mn 2++S 2-＝MnS↓
Cu 2++S 2-＝CuS↓
Zn 2++S 2-＝ZnS↓
Pb 2++S 2-＝PbS↓
6. the ammoniumsulphate soln that has removed heavy metal is squeezed into horizontal spiral discharge sedimentation centrifuge (8) by transfering material pump (9), and the ammoniumsulphate soln of isolating heavy metal precipitation through horizontal spiral discharge sedimentation centrifuge (8) enters finished product case (5).
In the ammonia type flue gas desulfurizing process, ammonium sulfate condensing crystal process is intermitten service.In practical engineering application, can implement according to the secondary purifying plant, the secondary purifying plant is divided into the two-stage centrifugal separating unit, transfer pH value case 1, transfering material pump 4 and horizontal spiral discharge sedimentation centrifuge 2 to form the first-stage centrifugal separating unit, removing heavy metals case 7, transfering material pump 9, horizontal spiral discharge sedimentation centrifuge 8 are formed the secondary centrifugal separation unit.When ammonium sulfate concentrations does not reach condensing crystal in the thionizer, the secondary centrifugal separation unit is out of service, slurries after the removal of impurity of first-stage centrifugal separating unit directly enter into ammonium sulfate finished product case 5, be driven in the thionizer by ammonium sulfate finished product case pump and pipeline again, carry out the circulation removal of impurity process of system.When ammonium sulfate concentrations in the thionizer reaches the condensing crystal condition, open the secondary centrifugal separation unit, with the ammoniumsulphate soln in the ammonium sulfate finished product case 5, be driven in the follow-up condensing crystal dehumidification system simultaneously, carry out the production of ammonium sulfate by ammonium sulfate finished product case pump and pipeline.

Claims (6)

1, a kind of sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process, comprise and transfer pH value case (1), centrifugal separation unit, transfer pH value case (1) and centrifugal separation unit to pass through pipe connection, transfering material pump (4) is set on connecting tube, connect aerator (3) in the bottom of transferring pH value case (1), centrifugal separation unit is horizontal spiral discharge sedimentation centrifuge (2).
2, a kind of sintering as claimed in claim 1, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process, it is characterized in that connecting removing heavy metals case (7) in the outlet of horizontal spiral discharge sedimentation centrifuge (2), removing heavy metals case (7) outlet is connected with another horizontal spiral discharge sedimentation centrifuge (8) by the transfering material pump (9) that is provided with on pipeline and the pipeline.
3, a kind of sintering as claimed in claim 1 or 2, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process is characterized in that (7) are provided with agitator (6) in transferring pH value case (1) and removing heavy metals case.
4, a kind of sintering, pelletizing and stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process method of purification comprise following characterization step:
1. aerator (3) is to transferring pH value case (1) to blast air;
2. in transferring pH value case (1), add the used ammoniacal liquor of the ammonia process of desulfurization, will transfer the interior ammoniumsulphate soln pH value of pH value case (1) to be adjusted into 7～8;
3. transfering material pump (4) will transfer the middle ammoniumsulphate soln of pH value case (1) to squeeze into horizontal spiral discharge sedimentation centrifuge (2);
4. horizontal spiral discharge sedimentation centrifuge (2) is isolated precipitate metal hydroxides and the dust in the ammoniumsulphate soln;
5. the ammoniumsulphate soln of isolating precipitate metal hydroxides and dust enters finished product case (5).
5, a kind of sintering as claimed in claim 4, pelletizing and stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process method of purification, it is characterized in that the isolated ammoniumsulphate soln of horizontal spiral discharge sedimentation centrifuge (2) enters removing heavy metals case (7), in removing heavy metals case (7), add the heavy metal remover, the ammoniumsulphate soln that has removed heavy metal is squeezed into horizontal spiral discharge sedimentation centrifuge (8) by transfering material pump (9), and the ammoniumsulphate soln of isolating heavy metal through horizontal spiral discharge sedimentation centrifuge (8) enters finished product case (5).
6, a kind of sintering as claimed in claim 4, pelletizing and stove ammonium sulphate solution produced by flue gas desulfurization by ammonia process method of purification is characterized in that the heavy metal remover is a sulfide.
CN2009100629690A 2009-07-03 2009-07-03 Purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process in the sintering, palletizing and kiln processes and method thereof Active CN101597070B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102350202A (en) * 2011-08-11 2012-02-15 武汉都市环保工程技术股份有限公司 System for desulfuration and ash removal of flue gas from steel plant sintering by ammonia method
CN102515200A (en) * 2011-11-25 2012-06-27 武汉兴能环保技术有限公司 Method for removing heavy metals in by-product of ammonia desulphurization
CN103638695A (en) * 2013-12-27 2014-03-19 云南铝业股份有限公司 Method for removing metal impurities in ammonia desulfurization process of petroleum coke calcination flue gas
CN103708502A (en) * 2014-01-03 2014-04-09 武汉科技大学 Method for purifying ammonium sulfate serving as desulfuration byproduct
CN104003421A (en) * 2014-05-29 2014-08-27 伊犁川宁生物技术有限公司 Method for removing impurities in desulfurization and denitrification by-products
CN106268251A (en) * 2016-08-08 2017-01-04 贵州赤天化桐梓化工有限公司 A kind of ammonia process of desulfurization enriching section solution PH adjusting means
CN107321154A (en) * 2017-05-16 2017-11-07 上海交通大学 A kind of ammonia type flue gas desulfurizing system and method
CN109399667A (en) * 2018-12-14 2019-03-01 湖南江冶机电科技股份有限公司 A kind of method and equipment of lead plaster ammonium method desulfurizing byproduct-ammonium sulfate deep purifying
CN110921958A (en) * 2019-12-17 2020-03-27 武汉钢铁有限公司 Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102350202A (en) * 2011-08-11 2012-02-15 武汉都市环保工程技术股份有限公司 System for desulfuration and ash removal of flue gas from steel plant sintering by ammonia method
CN102515200A (en) * 2011-11-25 2012-06-27 武汉兴能环保技术有限公司 Method for removing heavy metals in by-product of ammonia desulphurization
CN103638695A (en) * 2013-12-27 2014-03-19 云南铝业股份有限公司 Method for removing metal impurities in ammonia desulfurization process of petroleum coke calcination flue gas
CN103638695B (en) * 2013-12-27 2016-03-30 云南铝业股份有限公司 The minimizing technology of metal impurities in a kind of calcining petroleum coke flue gas ammonia method desulfurizing technique
CN103708502A (en) * 2014-01-03 2014-04-09 武汉科技大学 Method for purifying ammonium sulfate serving as desulfuration byproduct
CN103708502B (en) * 2014-01-03 2015-12-30 武汉科技大学 A kind of method of desulfuration byproduct ammonium sulfate purifying
CN104003421A (en) * 2014-05-29 2014-08-27 伊犁川宁生物技术有限公司 Method for removing impurities in desulfurization and denitrification by-products
CN106268251A (en) * 2016-08-08 2017-01-04 贵州赤天化桐梓化工有限公司 A kind of ammonia process of desulfurization enriching section solution PH adjusting means
CN107321154A (en) * 2017-05-16 2017-11-07 上海交通大学 A kind of ammonia type flue gas desulfurizing system and method
CN107321154B (en) * 2017-05-16 2020-08-25 上海交通大学 Ammonia flue gas desulfurization system and method
CN109399667A (en) * 2018-12-14 2019-03-01 湖南江冶机电科技股份有限公司 A kind of method and equipment of lead plaster ammonium method desulfurizing byproduct-ammonium sulfate deep purifying
CN110921958A (en) * 2019-12-17 2020-03-27 武汉钢铁有限公司 Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process

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