CN102814113A - Novel semi-dry ammonia desulfurization process - Google Patents
Novel semi-dry ammonia desulfurization process Download PDFInfo
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- CN102814113A CN102814113A CN201210302536XA CN201210302536A CN102814113A CN 102814113 A CN102814113 A CN 102814113A CN 201210302536X A CN201210302536X A CN 201210302536XA CN 201210302536 A CN201210302536 A CN 201210302536A CN 102814113 A CN102814113 A CN 102814113A
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- flue gas
- desulfurization
- flue
- desulfurizer
- novel semi
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention discloses a novel semi-dry ammonia desulfurization process applied to desulfurize flue gas generated by sintering of a sintering machine. The flue gas generated by the sintering machine enters an electrostatic dust collector after being dedusted through a multi-cyclone dust collector and desulfurized by a desulfurizer; ammonium sulfate as a desulfurization byproduct generated in the flue gas is separated by the electrostatic dust collector; and the separated flue gas is sucked into a flue through a main exhaust fan to enter a chimney to be discharged. According to the novel semi-dry ammonia desulfurization process, as ammonia flue gas desulfurization devices are respectively arranged in front of a traditional main exhaust fan and on a bypass pipeline of the upper segment of an original flue, and the novel semi-dry ammonia desulfurization process is adopted, the desulfurization efficiency and the commissioning rate of a system are high; the investment is small; and the energy consumption is low. The desulfurization product and dust are collected and separated, so that the flue gas emission dust content is reduced. Moreover, the novel semi-dry ammonia desulfurization process has the advantages that the operation is simple; the process design is unique and reasonable; the occupied area is small; the resistance is low; no corrosion is generated; the environmental pollution is reduced; and the production cost is reduced.
Description
Technical field: a kind of half dry type ammonia process of desulfurization new technology that the present invention relates to the flue gas that the sintering machine sintering produces is carried out Desulfurization Application.
Background technology: the smart powder sulfur-bearing of the homemade iron of China rate is higher, is generally 0.2-0.7%, is 10-20 times of the smart fine ore sulfur-bearing of import iron rate.The sulfur-bearing of China's coke is also higher relatively in addition, so steel sintering SO 2 from fume discharge capacity is bigger, generally between 400-2000mg/m, the enterprise that has is more up to 5000mg/m for concentration.For effectively solving in the sinter fume sulfur dioxide to the pollution of environment; The sulfur removal technology that the sintered flue gas desulfurization device that present China has moved adopts has different processes such as recirculating fluidized bed method, ammonia-thiamines method, limestone-gypsum method; But the ubiquity desulfurization degree is low; Investment and operating cost are high, thereby have improved production cost.
Summary of the invention: the objective of the invention is to overcome the drawback that former wet ammonia process desulfurizing exists, provide, 6 groups of atomising devices have been set at the desulfurizer front end in anterior desulfurizer and the supporting electrostatic precipitator of installing of main exhauster.Technological design is rationally unique, and desulfuration efficiency and system's operational percentage are high, and it is low to consume energy, and significantly reduces a kind of half dry type ammonia process of desulfurization new technology that smoke emissioning concentration uses.The present invention for realizing the technical scheme that above-mentioned purpose adopted is: the flue gas that its sintering machine produces gets into electrostatic precipitator again through the flue gas of multi-tube dust cleaner dedusting behind desulfurizer; Electrostatic precipitator is separated the desulfurizing byproduct ammonium sulfate that produces in the flue gas, and the flue gas after separating gets into chimney through main exhauster suction flue again and discharges.
The front end of described desulfurizer is provided with 6 groups of atomising devices; At first introduce blend tank from the holding vessel of desulfurizing agent preparation and feed system during operation with the deposed ammonia of about 20% concentration; With clear water configuration written treaty 5%-10% concentration ammoniacal liquor desulfurizing agent; Send into spray oxygen pump through frequency conversion and flow-control, atomize, in desulfurizer, reach desulfurized effect with the SO2 reaction through the atomizer in the desulfurization reactor.
The part ammonium sulfite that generates after the described desulfurizer desulfurization converts the ammonium sulfate crystallization body into surplus air in flue; Remaining few part and ammonium sulfite in electrostatic precipitator once more with flue gas in remaining ammonia and oxygen under the corona effect; Fully reacted goes out desulfurization product ammonium sulfate; And with flue gas in the separated collection in electrostatic precipitator of part dust, afterwards through ash conveying device input storage warehouse packing shipment.
The invention has the beneficial effects as follows: because the joint bypass line has been installed ammonia type flue gas desulfurizing apparatus before existing main exhauster and on original flue, adopted half dry type ammonia process of desulfurization new technology, its advance and characteristics mainly show following several respects:
1, desulfuration efficiency is high, and the So2 removal efficiency in the flue gas reaches as high as more than 96%;
2, system's operational percentage can reach more than 95%, guarantees the sintering plant safe and stable operation.
3, can reduce the fume emission dust content simultaneously, desulfurization product and dust collection are separated, dedusting ash can be returned sintering, and the recyclable pack of desulfurizing byproduct is sold, and is easy to handle than gypsum.Do not influence the recycling of dust.Sweetening process does not have waste liquid and produces.
4, the native system power consumption is low, and adopts the desulfurization medium can purchase ammoniacal liquor nearby, and operating cost is than other sulfur removal technology. and power consumption is merely the 30-50% of other technology.
5, desulphurization system is simple to operate, only needs 3-4 name supervisor just can move.
6, technological design is rationally unique more; Floor space is little, and investment only is that the 50-80% and the efficient of traditional desulfurization valency is high, and flue gas does not need cooling before getting into desulfurizer; Do not need after the desulfurization to heat up; When satisfying the desulfurization discharging, also has certain ability that removes nitrogen dioxide, advanced technology.
7, the flue gas after desulfurization temperature reduces about 15 ± 5 °, requires the preceding temperature of desulfurizer to remain on more than 120 °.To guarantee that desulphurization system does not produce the dewfall phenomenon.
8, resistance is little, and desulfurizer and cyclone dust collectors overall design resistance are less than 900Pa.
9, because this desulphurization system is a semi-dry desulphurization, ammoniacal liquor reacts rapidly and evaporation under high temperature action after spraying into desulfurizer, and the reactant through electric precipitation is collected is the drying composite of crystalline solid and sintering dust, and the escape amount of ammonia seldom.Therefore to the pipeline behind the device. deduster and blower fan etc. does not have corrosiveness basically.
10. present technique system floor space is little, and desulfurizer can merge solution with electrostatic precipitator in the flue combination.
Description of drawings: Fig. 1 is a process chart of the present invention
The specific embodiment: embodiment 1: as shown in Figure 1; The flue gas that its sintering machine produces gets into electrostatic precipitator again through the flue gas of multi-tube dust cleaner dedusting behind desulfurizer; Electrostatic precipitator is separated the desulfurizing byproduct ammonium sulfate that produces in the flue gas, and the flue gas after separating gets into chimney through main exhauster suction flue again and discharges.
Embodiment 2: as shown in Figure 1, described flue gas through the multi-tube dust cleaner dedusting filters and safe release through the water seal slide fastener.
Embodiment 3: as shown in Figure 1; The front end of described desulfurizer is provided with 6 groups of atomising devices; At first introduce blend tank from the holding vessel of desulfurizing agent preparation and feed system during operation,, send into spray oxygen pump through frequency conversion and flow-control with clear water configuration written treaty 5%-10% concentration ammoniacal liquor desulfurizing agent with the deposed ammonia of about 20% concentration; Atomizer through in the desulfurization reactor atomizes, and in desulfurizer, reaches desulfurized effect with the SO2 reaction.
Embodiment 4: as shown in Figure 1, the part ammonium sulfite that generates after the described desulfurizer desulfurization converts the ammonium sulfate crystallization body into surplus air in flue; Remaining few part and ammonium sulfite in electrostatic precipitator once more with flue gas in remaining ammonia and oxygen under the corona effect; Fully reacted goes out desulfurization product ammonium sulfate; And with flue gas in the separated collection in electrostatic precipitator of part dust, afterwards through ash conveying device input storage warehouse packing shipment.
Embodiment 5: as shown in Figure 1, describedly between multi-tube dust cleaner and main exhauster, install stop valve additional.
Embodiment 6: know-why of the present invention is:
1) not only desulfurization of ammonia-process desulfurization technique, but also denitration simultaneously
Chemical absorbing: ammoniacal liquor and sulfur dioxide generate ammonium sulfite and water (desulphurization reaction)
(ammoniacal liquor+sulfur dioxide=ammonium sulfite+water)
Reaction equation: 2NH
3.H
2O+SO
2=(NH
4)
2SO
3+ H
2O
Ammonium sulfite is transformed into the chemical equation of ammonium sulfate:
(ammonium sulfite+oxygen=ammonium sulfate)
Reaction equation: (NH
4)
2SO
3+ 1/20
2=(NH
4)
2SO
4
2) ammoniacal liquor and NOX and oxygen reaction generate nitrogen G&W (desulphurization reaction)
Reaction equation: 4NH
2+ 4NO+O
2=4N
2+ 6H
2O
8NH
3+6NO
2＝7N
2+12H
2O
In this process, the temperature of sinter fume is 12 ℃, ammoniacal liquor under the inferior hot environment after nozzle atomization ejection again in the flue gas rapidly with the sulfur dioxide reaction, and by the oxidation of the institute of the oxygen in the flue gas, the overwhelming majority's SO in this process
2By reacted ammonium sulfate, in addition some ammonium sulfite is failed timely oxidation and remaining SO
2Get in the electrostatic precipitator in the lump with flue gas.
Under the effect of electric field corona, the partial fume molecular ionization becomes high energy electron, and other flue gas molecule of high energy electron activation, cracking, ionization produces OH, O, HO
2Etc. various active particle and free radical.In reactor, the SO in the flue gas
2, NO is high-order oxide S O by active particle and free-radical oxidation
3, NO
2, with the H in the flue gas
2After meeting, the O molecule forms H
2SO
4And HNO
3, NH is being arranged
3Or generation (NH under other corrective situation
4)
2SO
4With NH
4NO
3, collect by deduster again, also have certain denitration function concurrently.
Claims (5)
1. half dry type ammonia process of desulfurization new technology; The flue gas that comprises the sintering machine generation is discharged through chimney through multi-tube dust cleaner, main exhauster; It is characterized in that behind desulfurizer, getting into electrostatic precipitator again through the flue gas of multi-tube dust cleaner dedusting; Electrostatic precipitator is separated the desulfurizing byproduct ammonium sulfate that produces in the flue gas, and the flue gas after separating gets into chimney through main exhauster suction flue again and discharges.
2. a kind of half dry type ammonia process of desulfurization new technology according to claim 1 is characterized in that described flue gas through the multi-tube dust cleaner dedusting filters and safe release through the water seal slide fastener.
3. a kind of half dry type ammonia process of desulfurization new technology according to claim 1; The front end that it is characterized in that described desulfurizer is provided with 6 groups of atomising devices; At first introduce blend tank from the holding vessel of desulfurizing agent preparation and feed system during operation,, send into spray oxygen pump through frequency conversion and flow-control with clear water configuration written treaty 5%-10% concentration ammoniacal liquor desulfurizing agent with the deposed ammonia of about 20% concentration; Atomizer through in the desulfurization reactor atomizes, and in desulfurizer, reaches desulfurized effect with the S02 reaction.
4. a kind of half dry type ammonia process of desulfurization new technology according to claim 1 is characterized in that the part ammonium sulfite that generates after the described desulfurizer desulfurization in flue, converting the ammonium sulfate crystallization body into surplus air; Remaining few part and ammonium sulfite in electrostatic precipitator once more with flue gas in remaining ammonia and oxygen under the corona effect; Fully reacted goes out desulfurization product ammonium sulfate; And with flue gas in the separated collection in electrostatic precipitator of part dust, afterwards through ash conveying device input storage warehouse packing shipment.
5. a kind of half dry type ammonia process of desulfurization new technology according to claim 1 is characterized in that describedly between multi-tube dust cleaner and main exhauster, installing stop valve additional.
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| CN201210302536XA CN102814113A (en) | 2012-08-13 | 2012-08-13 | Novel semi-dry ammonia desulfurization process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968401A (en) * | 2014-04-18 | 2014-08-06 | 华北电力大学 | Dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission |
| CN108014610A (en) * | 2018-01-05 | 2018-05-11 | 靳新令 | Ammonia desulfurizing process and its desulfurizer |
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|---|---|---|---|---|
| CN1332029A (en) * | 2000-07-11 | 2002-01-23 | 徐光� | Semi-dry fume-purifying linear pulse electron beam method |
| CN1382529A (en) * | 2002-04-01 | 2002-12-04 | 山东中实股份有限公司 | Self-drying corona discharge process and equipment for cleaning fume |
| CN102380308A (en) * | 2010-09-03 | 2012-03-21 | 鞍钢集团工程技术有限公司 | Sintering flue gas desulfurization and purification method and equipment |
-
2012
- 2012-08-13 CN CN201210302536XA patent/CN102814113A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332029A (en) * | 2000-07-11 | 2002-01-23 | 徐光� | Semi-dry fume-purifying linear pulse electron beam method |
| CN1382529A (en) * | 2002-04-01 | 2002-12-04 | 山东中实股份有限公司 | Self-drying corona discharge process and equipment for cleaning fume |
| CN102380308A (en) * | 2010-09-03 | 2012-03-21 | 鞍钢集团工程技术有限公司 | Sintering flue gas desulfurization and purification method and equipment |
Non-Patent Citations (1)
| Title |
|---|
| 李秋荣: ""电晕放电除尘脱硫脱氮试验及其机理研究"", 《中国博士学位论文全文数据库 工程科技I辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968401A (en) * | 2014-04-18 | 2014-08-06 | 华北电力大学 | Dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission |
| CN103968401B (en) * | 2014-04-18 | 2016-05-18 | 华北电力大学 | Dedusting-desulfurization-UTILIZATION OF VESIDUAL HEAT IN integral system of low PM2.5 discharge |
| CN108014610A (en) * | 2018-01-05 | 2018-05-11 | 靳新令 | Ammonia desulfurizing process and its desulfurizer |
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Application publication date: 20121212 |