CN104437031A - Iron smelting flue gas treatment method - Google Patents
Iron smelting flue gas treatment method Download PDFInfo
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- CN104437031A CN104437031A CN201410618064.8A CN201410618064A CN104437031A CN 104437031 A CN104437031 A CN 104437031A CN 201410618064 A CN201410618064 A CN 201410618064A CN 104437031 A CN104437031 A CN 104437031A
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- flue gas
- desulfurization
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Abstract
The invention discloses an iron smelting flue gas treatment method. The iron smelting flue gas treatment method comprises the following steps: firstly, dust removal is carried out on flue gas by a dust remover; then, nitric oxide in the flue gas is removed by adopting an SCR method; after the nitric oxide is removed, the flue gas is conveyed into a desulfurization device; the flue gas subjected to desulfurization treatment is discharged into air, wherein the desulfurization device is provided with a nozzle; in a desulfurization process, a mixed solution of hydrogen chloride and hypochlorous acid is sprayed into the desulfurization device, wherein the mol ratio of hydrogen chloride to hypochlorous acid is (5-10) to (3-4); a compound adsorbent is arranged at a flue gas outlet of the desulfurization device and is specifically formed by 20wt%-60wt% of active carbon, 20wt%-40wt% of MCM-41 and 20wt%-30wt% of NaY type zeolite; and a preparation method of the compound adsorbent is a mixing method. By virtue of the method, when more than 80% of denitration efficiency and more than 95% of desulfurization efficiency are reached, more than 80% of demercuration efficiency and more than 95% of dechloridation and defluorination efficiency are reached and partial volatile organic pollution is oxidized and degraded, so that the environment protection standards which are increasingly strict in the future can be met.
Description
Technical field
The present invention relates to a kind of smelting iron flue gas processing method.
Background technology
The oxysulfide produced in using energy source process, the nitrogen oxide atmospheric environment to China causes day by day serious harm, and the harm such as in addition micro-heavy metal Hg Hg, HCl, HF and volatile organic contaminant VOC also causes the attention of people day by day.Carried out large-scale improvement and control to sulfur dioxide at present, the control of nitrogen oxide is also brought into schedule day by day, and mercury, chlorine, fluorine, volatile organic contaminant etc. not yet explicitly call in the coal-burning boiler of China.Along with the development of China's economic society and the enhancing of people's environmental protection consciousness, these pollutants certainly will will progressively control.
Current existing desulfur technology can be divided into several classes such as dry method, semidry method and wet method.Dry method, semidry method investment operating cost is low, but often there is the not high shortcoming of desulfuration efficiency, and extensive boiler combustion equipment such as station boiler etc. often can not meet the requirement of environmental protection.That current station boiler extensively adopts is limestone/gypsum wet flue gas desulphurization technology (WFGD), and the method desulfuration efficiency is high, stable, but it is large to there is water consumption, waste discharge secondary pollution, investment and the shortcoming such as operating cost is higher.
The control technology of nitrogen oxide mainly contains two classes: the first generic stove combustion process control mode, mainly contain low-NOx combustor technology, OFA (Over fire air) technology, low oxygen combustion technology, then combustion technology etc. adjusts control NO by combustion process
xdischarge, can by NO
xcontrol at medium emission level, general denitration efficiency is about 30 ~ 50%.But these technology easily cause combustion stability to decline on the one hand, and burner region easily forms local reduction atmosphere, causes ash fusion point to decline, and causes the pickup slagging scorification phenomenon of water-cooling wall, the normal safe affecting boiler runs.On the other hand along with the further raising of environmental requirement, be difficult to realize NO
xfurther emission control.Equations of The Second Kind technology is gas denitrifying technology, and the countries use such as the current U.S., Japan, Europe the most widely technology are SCR technology (SCR).SCR technology denitration efficiency is high, stable, but dust granules higher in flue gas under high grey deployment scenarios easily causes the problem such as wearing and tearing, blocking of catalyst, and the heavy metal in flying dust can cause the poisoning of catalyst, run and investment cost very expensive.Environmental Protection in China work is started late, the control of sulfur dioxide just just starts, nitrogen oxide certainly will be brought into schedule from now on, according to the thinking that developed country administers item by item, adopt the desulfurization of wet process of FGD WFGD device, the method of selective catalysis SCR denitration certainly will increase huge investment, operating cost, and some old units even exist the problems such as difficult arrangement, and therefore developing low-cost, high efficiency simultaneous SO_2 and NO removal technology just seem particularly important.
Current Mercury vacancy method, mainly contains active carbon adsorption, wet process of FGD (WFGD) device demercuration method and flying dust absorption demercuration method.Because coal-burning boiler mercury background concentration is lower, active carbon consumption is large, and cost is higher.Wet flue gas desulfurizer only effectively can absorb bivalent mercury, and elemental mercury often accounts for more than 50%, and wet flue gas desulfurizer WFGD is helpless to elemental mercury, and its demercuration efficiency is totally on the low side.Flying dust absorption demercuration efficiency is lower, is still in the laboratory research stage at present.And for the hydrogen chloride HCl in boiler smoke and hydrogen fluoride HF and volatile organic contaminant VOC, except except the special high concentration occasions such as incinerator, be generally all in without control state.
Due in the waste gas of discharging from the coal-burning boiler such as the burner of heat power station etc. containing toxic very high mercury, so carried out various research to the system of mercury in removing waste gas all the time.Usually, in order to remove the sulphur component in waste gas, in coal-burning boiler, wet desulfurizer is provided with.Well-known following true: in above-mentioned this boiler, to be provided with the desulfurizer as emission-control equipment and in the waste gas treatment equipment that formed, when chlorine (Cl) component in waste gas increases, the ratio of water-soluble divalent mercury metal increases, and is easily trapped mercury by above-mentioned desulfurizer.
As the method for the mercury metal in process Large Copacity waste gas, propose following method: in flue, in the upstream process of high temperature nitrogen rejection facility, gas atomization chlorinating agent, denitrification catalyst is oxidized (chlorination) mercury, after changing into water-soluble mercury chloride, absorbed (see, for example patent document 1 and 2) by the wet desulfurizer in downstream.It should be noted that, because the device of gas atomization in flue and technology are at the NH of nitrogen rejection facility
3sprayer unit in practical application, also can adopt in the gas atomization of chlorinating agent and use the same method.The exhaust treatment system 100 that prior art relates to possesses using lower device: remove from supplying coal supply as the nitrogen oxide in the waste gas 12 of the coal-burning boiler 11 of fuel F, hydrogen chloride 23 of simultaneously spraying in gas makes the nitrogen rejection facility 13 of mercury oxidation; Reclaim the air heater 14 of the heat in the gas after removing nitrogen oxide; The dust arrester 15 of coal dust in gas after removing recuperation of heat; The desulfurizer 16 of gas sulphur oxide after removing dedusting; Externally discharge the chimney 17 of gas after desulfurization; And produce the hydrogen chloride gas gasifying device 21 of above-mentioned hydrogen chloride 23.
CN00104875 discloses use wet gas scrubbing appts, and improve by the method for wet gas scrubbing appts slurry collection and the mercurous industrial waste gas of washing, this improvement comprises: in industrial waste gas, add hydrogen sulfide; Detergent industry waste gas in wet gas scrubbing appts.Be specially adapted to the coal-fired requirement producing requirement minimizing mercury emissions in the industrial process of dead flue gas in a furnace, method comprises: conveying stack gases passes through dust arrester, in flue gas, add sulfide, enter wet gas scrubbing appts afterwards, or add hydrogen sulfide to flue gas in wet gas scrubbing appts.Simultaneously to the improvement of method using the washer collecting and wash mercurous industrial waste gas, these improvement comprise: the aqueous solution adding sulphide salt in industrial waste gas, and detergent industry waste gas in the washers.Be particularly useful for the coal-fired requirement producing requirement minimizing mercury emissions in the industrial process of dead flue gas in a furnace, method comprises: carry stack gases by dust arrester, as fabric filter or precipitator.The equipment of the washer of mercurous industrial waste gas is collected and washed to the use base reagent aqueous solution, and concrete improvement comprises: the device providing the device of sulfidion solution and control the sulfidion solution joining industrial waste gas in washer.The present invention is also specially adapted to the public utilities device of burning mineral fuel as coal or solid waste, these devices are except use washer, also use dust arrester (as precipitator or fabric filter), and/or other is for reducing the usual means to airborne release.
CN200610054759 discloses a kind of boiler smoke gas multipollutant ozonization and simultaneous elimination devices and methods therefor.Boiler smoke gas multipollutant ozonization and simultaneous elimination method comprises the following steps: before or after the electrostatic precipitator 1) on boiler flue, 110 ~ 150 DEG C of low-temperature zone spray into ozone, the nitrogen oxide molar ratio sprayed in ozone and boiler smoke is 1.1 ~ 2.0, lower valency nitrogen oxides water-fast in boiler smoke is become high-valence state nitrogen oxide soluble in water, oxidizing sulfur dioxide generates sulfur trioxide, elemental mercury is oxidized to bivalent mercury soluble in water, volatile organic contaminant oxidative degradation, the reaction time is at least 0.5 second.2) send into the boiler smoke through previous step process to washing in alkali liquid washing tower, high-valence state nitrogen oxide, oxysulfide, mercury and hydrogen chloride in simultaneously stability flue gas, hydrogen fluoride, add H in reservoir
2s, Na
2s or NaHS mercury fixative, makes bivalent mercury generate HgS precipitation, sulfate and nitrate condensing crystallizing.Alkali lye be in NaOH, potassium hydroxide, calcium hydroxide, calcium oxide, calcium carbonate or ammoniacal liquor one or more.
Summary of the invention
The object of the invention is to a kind of method proposing purifying smoke.
For reaching this object, the present invention by the following technical solutions:
A kind of smelting iron flue gas processing method, it comprises the following steps: first adopt deduster to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 5-10:3-4, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 20-60wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 20-30wt% of 20-40wt%, the preparation method of this compound adsorbent is mixing method.
The method can reach more than 80% denitration efficiency and more than 95% desulfuration efficiency while, realize the demercuration efficiency of more than 80%, the dechlorination and defluorination efficiency of more than 95% and the oxidative degradation of some volatile organic contamination, the environmental requirement of increasingly stringent from now on can be met.
Detailed description of the invention
Embodiment 1
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 5:3, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 60wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 20wt% of 20wt%, the preparation method of this compound adsorbent is mixing method.
Embodiment 2
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 7:3, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 50wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 25wt% of 25wt%, the preparation method of this compound adsorbent is mixing method.
Embodiment 3
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 8:5, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 50wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 25wt% of 25wt%, the preparation method of this compound adsorbent is mixing method.
Embodiment 4
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 9:4, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 50wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 30wt% of 20wt%, the preparation method of this compound adsorbent is mixing method.
Embodiment 5
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 8:3, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 60wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 20wt% of 20wt%, the preparation method of this compound adsorbent is mixing method.
Embodiment 6
A kind of smelting iron flue gas processing method, first deduster is adopted to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 10:3, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 55wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 20wt% of 25wt%, the preparation method of this compound adsorbent is mixing method.
Claims (1)
1. a smelting iron flue gas processing method, it comprises the following steps: first adopt deduster to carry out dedusting to flue gas, then the nitrogen oxide in SCR method removing flue gas is adopted, after removing nitrogen oxide, flue gas is sent into desulfurizer, flue gas after desulfurization process is emptying, it is characterized in that: in desulfurizer, there is nozzle, in desulfurizer, hydrogen chloride and hypochlorous mixed liquor is sprayed by nozzle while desulfurization, wherein hydrogen chloride and hypochlorous mol ratio are 5-10:3-4, and at the exhanst gas outlet of desulfurizer, compound adsorbent is set, the active carbon specifically consisting of 20-60wt% of compound adsorbent, the NaY type zeolite of MCM-41 and 20-30wt% of 20-40wt%, the preparation method of this compound adsorbent is mixing method.
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Cited By (4)
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| CN105148709A (en) * | 2015-09-06 | 2015-12-16 | 中国神华能源股份有限公司 | Smoke treatment method |
| CN105617858A (en) * | 2016-01-15 | 2016-06-01 | 环境保护部华南环境科学研究所 | Combined synergetic deep purification process for multiple pollutants in flue gas |
| CN109107356A (en) * | 2018-08-20 | 2019-01-01 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass tank furnace smoke processing system |
| CN111617598A (en) * | 2020-06-16 | 2020-09-04 | 潘帅 | Energy-saving environment-friendly wet-type desulfurization dust removal device and treatment method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105148709A (en) * | 2015-09-06 | 2015-12-16 | 中国神华能源股份有限公司 | Smoke treatment method |
| CN105148709B (en) * | 2015-09-06 | 2017-06-16 | 中国神华能源股份有限公司 | A kind of flue gas processing method |
| CN105617858A (en) * | 2016-01-15 | 2016-06-01 | 环境保护部华南环境科学研究所 | Combined synergetic deep purification process for multiple pollutants in flue gas |
| CN109107356A (en) * | 2018-08-20 | 2019-01-01 | 彩虹集团（邵阳）特种玻璃有限公司咸阳分公司 | A kind of cover-plate glass tank furnace smoke processing system |
| CN111617598A (en) * | 2020-06-16 | 2020-09-04 | 潘帅 | Energy-saving environment-friendly wet-type desulfurization dust removal device and treatment method |
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