JP4237463B2 - Non-ferrous smelting furnace exhaust gas treatment method containing oxygen and SO2 in exhaust gas - Google Patents
Non-ferrous smelting furnace exhaust gas treatment method containing oxygen and SO2 in exhaust gas Download PDFInfo
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- JP4237463B2 JP4237463B2 JP2002290360A JP2002290360A JP4237463B2 JP 4237463 B2 JP4237463 B2 JP 4237463B2 JP 2002290360 A JP2002290360 A JP 2002290360A JP 2002290360 A JP2002290360 A JP 2002290360A JP 4237463 B2 JP4237463 B2 JP 4237463B2
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- containing oxygen
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- 239000007789 gas Substances 0.000 title claims description 88
- 238000003723 Smelting Methods 0.000 title claims description 55
- 238000000034 method Methods 0.000 title claims description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 23
- 239000001301 oxygen Substances 0.000 title claims description 23
- 229910052760 oxygen Inorganic materials 0.000 title claims description 23
- 239000000428 dust Substances 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 11
- 238000010790 dilution Methods 0.000 claims description 11
- 239000012895 dilution Substances 0.000 claims description 11
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000001180 sulfating effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 18
- 230000005855 radiation Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005670 sulfation reaction Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、排ガス中に１０％以上の酸素とSO2を含む非鉄製錬炉の排ガス処理方法に関するものである。
【０００２】
【従来の技術】
一般的に、排ガス中に酸素とSO2を含む非鉄製錬炉排ガスは、冷却・希釈等の温度調整工程を経て、バグフィルターまたは電気集塵機等で除塵されるか、あるいは直接SO2ガスの吸収設備に導入処理された後大気放出される。
温度調整工程で排熱回収を目的とする設備に導入され、熱回収を図る場合もある。
一方、自溶炉に代表される硫化鉱を処理する非鉄製錬炉ボイラでは、付着性の高いダストを多く含む高温排ガスを処理するため、缶壁へのダスト融着防止が課題であり、多くの操業方法が提案されている。
【０００３】
特公平6-41836「溶鉱炉のガス処理における粉塵成長を減少させるための方法及び装置」（特許文献１）は、ボイラ放熱室遠端付近への酸素含有ガス吹込みを行なう方法である。
特開平6-347001「自溶炉ボイラの煙灰付着防止方法」（特許文献２）は、ボイラ火炉への窒素ガス吹込みを行う方法である。
また、特開平11-63401「自溶炉廃熱ボイラ操業方法」（特許文献３）は、ボイラ火炉への窒素と空気混合ガス吹込みを行う方法である。
さらに、他の方法としては、ボイラ出口ガスの輻射部入口天井及び側壁への再循環を行い、輻射部入口ガス温度を低下させるとともにダストの酸化に必要な酸素の供給を行う方法もある。
【０００４】
上記、従来の排ガス中に酸素とSO2を含む非鉄製錬炉排ガス処理方法では、冷却や除塵および脱硫処理のために別途設備が必要であり、設備投資と運転費用を要する。
また、本願にかかる排ガス中には酸素と少量のSO２ガスを含むため冷却過程でＳＯ３が生成し、配管および設備の酸露点腐食が進行しやすいため、操業及び設備管理に労力と費用を要する。
一方、非鉄製錬炉ボイラの操業方法のうち、ボイラ出口排ガス再循環の
方法では、再循環ガス配管の腐食、ダスト堆積が顕著で維持保全に多大な労力と費用を費やしていた。
また、特公平６−４１８３６の発明では、ボイラ放熱室の遠端付近へのガス吹込みを行うため、対流室のダスト付着防止には、有効であるが、輻射部（放熱室）管壁へのダスト付着を防止できないと言う問題を有していた。
【０００５】
【特許文献１】
特公平6-41836
【０００６】
【特許文献２】
特開平6-347001
【０００７】
【特許文献３】
特開平11-63401
【０００８】
【発明が解決しようとする課題】
本発明においては、１０％以上の酸素を含む排ガス処理用の除塵設備、Ｓ O2ガスの吸収設備を不要とし、設備投資金額および処理設備の運転コストの削減を図ることを目的の一つとする。
またダストが輻射部及び滞留部管壁に付着することを防止し、ボイラ操業を安定化することを可能とする非鉄製錬炉ボイラの操業方法を提供するものである。
【０００９】
【課題を解決するための手段】
そこで、以下の発明をなした。
（１）１０％以上の酸素とSO2を含む錬カン炉の排ガスを、全量自溶炉ボイラの輻射部入口天井から吹込み、錬カン炉排ガスと自溶炉排ガスを混合処理することにより、錬カン炉排ガス処理用の除塵設備及びSO２ガス吸収設備を常時不要とすることを特徴とする排ガス中に酸素とSO2を含む錬カン炉排ガスの処理方法。
（２）上記（１）において、自溶炉ボイラの輻射部入口において自溶炉排ガス入口の天井から吹込む際に、空気で希釈し、該排ガスの温度を120℃以上350℃以下とするともに、自溶炉排ガスに含まれる硫化物ダストを硫酸塩化することを特徴する排ガス中に酸素とSO2を含む錬カン炉排ガスの処理方法。
【００１０】
（３）上記（１）又は（２）の何れかにおいて、自溶炉ボイラの輻射部入口天井から吹込む際に、流量と流速を希釈空気量の増減と吹込み孔の断面積増減により調整し、排ガスの吹込み流速を10m/sec以上とし、前記ガスの混合を促進することを特徴とする排ガス中に酸素とSO2を含む錬カン炉排ガスの処理方法。
【００１１】
以下、本発明の構成を詳しく説明する。
酸素とSO2を含む非鉄製錬炉の排ガスとは、例えば自溶炉製錬法においては、錬カン炉の排ガスである。錬カン炉は、例えば自溶炉に隣接され、自溶炉で発生したスラグ中に含まれているマットを分離回収する炉である。
該排ガスを遠心式ファンにより吸引・加圧し、自溶炉に代表される硫化鉱を処理する非鉄製錬溶鉱炉ボイラの輻射部入口部から吹込む。
【００１２】
錬カン炉出口の排ガス温度は600℃以上であるが、ボイラへ吹き込む排ガス温度は、遠心式ファンの一般的耐用温度を考慮して，350℃以下であることが望ましい。このため空気で希釈し温度調整を行う。
空気希釈に当たっては、排ガスを酸露点（１２０℃）以上に保ち、入口部ボイラ蒸発管及び配管の腐食を防止する必要がある。
【００１３】
希釈空気量は、硫化鉱を処理する非鉄製錬炉排ガス中に含まれる硫化物ダストを硫酸塩化するように調整する。
吹込み位置は、半熔融状態のダストを含む非鉄製錬炉排ガスがボイラ内に流入後、偏流となってボイラの管壁にそのまま衝突して、ダスト付着を生成させることの防止を目的として、ボイラ輻射部入口天井とする。
また、ボイラ内の主流を形成する非鉄製錬炉排ガスと、ボイラ輻射部入口の上記天井から吹込まれる空気との混合を促進し、希釈後の錬カン炉排ガスが確実にダストを硫酸塩化すること、及び自溶炉排ガス主流が偏流となってボイラの管壁とそのまま接触を防止することを目的に、希釈空気量および吹込みノズルの断面積を調整し、吹込み流速は１０ｍ／ｓｅｃ以上を保つ必要がある。
【００１４】
【実施例】
以下図１に基づき詳細に説明する。
自溶炉（１）付属の電気錬カン炉（６）排ガス（温度500〜600℃、ＳＯ２濃度５０〜５００ｐｐｍ、酸素濃度約20％、流量3,000〜6,000Nm3/ｈ）を専用ファン（７）で吸引、加圧後自溶炉ボイラ（３）輻射部（４）入口天井部排ガス入口（２）より流速１５ｍ/secで吹込みを行った。
吹込みフローは、以下のとおりである。
前記専用ファンは、回転数調整機能を持ち、ファンの吸引側には、流量計付希釈空気導入配管を設けられている。希釈空気量は、ファン回転数により制御される。
【００１５】
また、錬カン炉排ガス流量は、錬カン炉炉内圧調整弁により、炉内圧を一定に保つ方法で制御される。
実施例では、希釈空気量６，０００〜９，０００Ｎｍ３／ｈとし、ダストの付着性及び量、を監視しながら希釈空気量を変化させた。
その結果、希釈後の排ガス温度は１２０〜１５０℃程度となった。
上記流量及び温度条件下で流速１０ｍ／ｓｅｃ以上を確保するため、吹込み孔の断面積の調整を行った。その結果、自溶炉装入量１７０ｔ／ｈの操業条件下において、ボイラ輻射部（４）及び対流部（５）管壁にダストを付着させることなく操業を実施することができた。
【００１６】
【発明の効果】
以上説明したように、本発明により、
（１）１０％以上の酸素とSO2を含む非鉄製錬炉の排ガスを自溶炉に代表される非鉄製錬溶鉱炉ボイラの輻射部入口に吹込みボイラ排ガスと混合処理することで、排ガス処理用の除塵設備、ＳO2ガスの吸収設備が不要となり、設備投資金額の削減が図れる。
【００１７】
（２）自溶炉に代表される硫化鉱を処理する非鉄製錬溶鉱炉の排ガスは、一般的に高濃度のＳＯ２ガスを含むため硫酸工場内で２次空気による希釈が必要である。本発明では、ボイラ輻射部入口部で希釈空気の一部に相当する酸素とSO2を含む非鉄製錬炉の排ガスを吹込み処理することで、希釈空気の一部を相殺させるため、硫酸工場の処理ガス量は増加しない一方、排ガス処理用の除塵設備、ＳO2ガスの吸収設備が不要となるため運転コストの低減が図れる。
【００１８】
（３）ボイラ輻射部入口であって、天井及び側壁から酸素とSO2を含む非鉄製錬溶鉱炉の排ガスを吹込むことで、排ガス中の酸素が、硫化鉱を処理する非鉄製錬炉排ガス中に含まれる付着性の高い硫化物ダストを、ボイラ輻射部空間内で酸化し、硫酸塩とすることで、ダストが輻射部及び滞留部管壁に付着するのを防止でき、ボイラ操業が安定化する。
また、輻射部入口天井・側壁から流速１０ｍ／ｓｅｃ以上で当該ガスを吹込むことにより、排ガス主流の偏流を防止し、高温半溶融状態のダストの管壁との接触を抑制できるとともに、排ガス主流と吹込みガス流の輻射部内での混合が促進し、前述の硫酸化反応がさらに安定的に進行しうる。
【００１９】
（４）酸素とSO2を含む非鉄製錬炉の排ガスを空気希釈する際に、温度制御を行い酸露点以上を保つことにより、配管の腐食を防止できる。
（５）錬カン炉排ガスの処理が極めて効率的に処理可能となり、自溶炉製錬における排ガス処理が効率的に行われるようになる。
【００２０】
【図面の簡単な説明】
【図１】排ガス処理の一態様である処理フローを示す。
【符号の説明】
１ 自溶炉
２ 自溶炉ボイラ輻射部 天井部排ガス入口
３ 自溶炉ボイラ
４ 自溶炉ボイラ輻射部
５ 自溶炉ボイラ対流部
６ 錬カン炉[0001]
[Industrial application fields]
The present invention relates to an exhaust gas treatment method for a non-ferrous smelting furnace containing 10% or more of oxygen and SO2 in the exhaust gas.
[0002]
[Prior art]
In general, non-ferrous smelting furnace exhaust gas containing oxygen and SO2 in the exhaust gas is subjected to a temperature adjustment process such as cooling and dilution, and then removed by a bag filter or an electrostatic precipitator, or directly into a SO2 gas absorption facility. After being introduced, it is released into the atmosphere.
In some cases, it is introduced into equipment for the purpose of exhaust heat recovery in the temperature adjustment process and heat recovery is attempted.
On the other hand, in non-ferrous smelting furnace boilers that process sulfide ores such as flash smelting furnaces, high-temperature exhaust gas that contains a lot of highly adhering dust is treated. The method of operation is proposed.
[0003]
Japanese Patent Publication No. 6-41836, “Method and apparatus for reducing dust growth in gas treatment in a blast furnace” (Patent Document 1) is a method of injecting an oxygen-containing gas into the vicinity of the far end of a boiler heat radiation chamber.
Japanese Patent Laid-Open No. 6-347001 "Method for preventing smoke ash adhesion of a flash furnace boiler" (Patent Document 2) is a method of blowing nitrogen gas into a boiler furnace.
Japanese Patent Laid-Open No. 11-63401 “Method for operating a flash smelter waste heat boiler” (Patent Document 3) is a method of blowing nitrogen and air mixed gas into a boiler furnace.
Further, as another method, there is a method of recirculating the boiler outlet gas to the radiant portion inlet ceiling and side walls to lower the radiant portion inlet gas temperature and supply oxygen necessary for oxidation of dust.
[0004]
In the above-described conventional non-ferrous smelting furnace exhaust gas treatment method containing oxygen and SO2 in the exhaust gas, additional equipment is required for cooling, dust removal and desulfurization treatment, which requires equipment investment and operating costs.
Further, since the exhaust gas according to the present application contains oxygen and a small amount of SO2 gas, SO3 is generated during the cooling process, and the acid and dew point corrosion of the piping and equipment is likely to proceed. Therefore, labor and cost are required for operation and equipment management.
On the other hand, among the operation methods of non-ferrous smelting furnace boilers, the exhaust gas recirculation method at the boiler outlet has caused significant corrosion and dust accumulation in the recirculation gas piping, and has spent a great deal of labor and cost for maintenance.
In addition, in the invention of Japanese Patent Publication No. 6-41836, since the gas is blown near the far end of the boiler heat radiation chamber, it is effective in preventing dust from adhering to the convection chamber, but to the radiation portion (heat radiation chamber) tube wall. There was a problem that it was not possible to prevent the adhesion of dust.
[0005]
[Patent Document 1]
6-41836
[0006]
[Patent Document 2]
JP-A-6-347001
[0007]
[Patent Document 3]
JP-A-11-63401
[0008]
[Problems to be solved by the invention]
An object of the present invention is to eliminate the need for dust removal equipment for exhaust gas treatment containing 10% or more of oxygen and SO 2 gas absorption equipment, and to reduce the amount of equipment investment and the operating cost of the treatment equipment.
It is another object of the present invention to provide a method for operating a non-ferrous smelting furnace boiler that prevents dust from adhering to the radiant section and the staying section pipe wall and makes it possible to stabilize the boiler operation.
[0009]
[Means for Solving the Problems]
Therefore, the following invention was made.
(1) The exhaust gas of the smelting furnace containing 10% or more of oxygen and SO 2 is blown from the ceiling of the radiant part of the flash smelting furnace boiler, and the smelting furnace exhaust gas and the smelting furnace exhaust gas are mixed and processed. A method for treating exhaust gas from a smelting furnace containing oxygen and SO 2 in exhaust gas, characterized in that dust removal equipment and SO 2 gas absorption equipment for treating smelter furnace exhaust gas are not required at all times.
(2) In the above (1), when blowing from the ceiling of the flash furnace exhaust gas inlet at the radiant part inlet of the flash smelting furnace boiler, it is diluted with air so that the temperature of the exhaust gas is 120 ° C. or higher and 350 ° C. or lower. A method for treating exhaust gas from a smelting furnace containing oxygen and SO 2 in an exhaust gas, characterized by sulfating sulfide dust contained in the flash furnace exhaust gas.
[0010]
(3) In either of the above (1) or (2), the flow rate and flow velocity are adjusted by increasing / decreasing the dilution air amount and increasing / decreasing the cross-sectional area of the blowing hole when blowing from the ceiling of the radiant part of the flash furnace. And treating the exhaust gas containing oxygen and SO 2 in the exhaust gas, wherein the exhaust gas injection flow rate is 10 m / sec or more and mixing of the gas is promoted.
[0011]
Hereinafter, the configuration of the present invention will be described in detail.
The exhaust gas of the non-ferrous smelting furnace containing oxygen and SO2 is, for example, the exhaust gas of the smelting furnace in the flash smelting furnace smelting method. The smelting furnace is, for example, a furnace that is adjacent to a flash smelting furnace and separates and recovers mats contained in slag generated in the flash smelting furnace.
The exhaust gas is sucked and pressurized by a centrifugal fan, and blown from a radiant part inlet of a non-ferrous smelting smelting furnace boiler that processes sulfide ore typified by a flash smelting furnace.
[0012]
The exhaust gas temperature at the outlet of the smelting furnace is 600 ° C or higher, but the exhaust gas temperature blown into the boiler is preferably 350 ° C or lower in consideration of the general service temperature of the centrifugal fan. Therefore, the temperature is adjusted by diluting with air.
In the air dilution, it is necessary to keep the exhaust gas at an acid dew point (120 ° C.) or higher to prevent corrosion of the inlet boiler evaporation pipe and piping.
[0013]
The amount of dilution air is adjusted so that sulfide dust contained in non-ferrous smelting furnace exhaust gas treating sulfide ore is sulfated.
For the purpose of preventing the non-ferrous smelting furnace exhaust gas containing dust in a semi-molten state from flowing into the boiler and then colliding with the boiler tube wall as it is, and generating dust adhesion, Boiler radiation section entrance ceiling .
In addition, it promotes the mixing of the non-ferrous smelting furnace exhaust gas that forms the mainstream in the boiler and the air blown from the ceiling at the boiler radiant section entrance, and the diluted smelting furnace exhaust gas reliably sulfates dust. In order to prevent contact with the boiler tube wall as the main stream of the blast furnace exhaust gas becomes a drift, the dilution air amount and the cross-sectional area of the blowing nozzle are adjusted, and the blowing flow rate is 10 m / sec or more. Need to keep.
[0014]
【Example】
This will be described in detail with reference to FIG.
Flash furnace (1) Electric smelting furnace (6) Exhaust gas (temperature 500-600 ° C, SO2 concentration 50-500ppm, oxygen concentration 20%, flow rate 3,000-6,000Nm3 / h) with dedicated fan (7) After the suction and pressurization, the flash furnace was blown at a flow rate of 15 m / sec from the exhaust gas inlet (2) at the ceiling part exhaust gas boiler (3) radiation section (4) inlet.
The blowing flow is as follows.
The dedicated fan has a rotation speed adjustment function, and a dilution air introduction pipe with a flow meter is provided on the suction side of the fan. The amount of dilution air is controlled by the number of fan rotations.
[0015]
Further, the smelting furnace furnace exhaust gas flow rate is controlled by a smelting furnace furnace internal pressure regulating valve in a method of keeping the furnace internal pressure constant.
In the examples, the amount of diluted air was 6,000 to 9,000 Nm 3 / h, and the amount of diluted air was changed while monitoring the adhesion and amount of dust.
As a result, the exhaust gas temperature after dilution was about 120 to 150 ° C.
In order to ensure a flow rate of 10 m / sec or more under the above flow rate and temperature conditions, the cross-sectional area of the blow hole was adjusted. As a result, it was possible to carry out the operation without adhering dust to the boiler radiation part (4) and the convection part (5) tube wall under the operation condition of the flash furnace charging amount of 170 t / h.
[0016]
【The invention's effect】
As explained above, according to the present invention,
(1) For exhaust gas treatment, exhaust gas from non-ferrous smelting furnaces containing 10% or more oxygen and SO2 is mixed with the boiler exhaust gas injected into the radiant section inlet of non-ferrous smelting furnaces represented by flash furnaces. This eliminates the need for dust removal equipment and SO2 gas absorption equipment, reducing capital investment.
[0017]
(2) Exhaust gas from a non-ferrous smelting blast furnace for treating sulfide ore typified by a flash smelting furnace generally contains a high concentration of SO2 gas, and therefore needs to be diluted with secondary air in a sulfuric acid factory. In the present invention, the non-ferrous smelting furnace exhaust gas containing oxygen and SO2 corresponding to a part of the dilution air at the inlet of the boiler radiant part is injected to cancel a part of the dilution air. While the amount of processing gas does not increase, the dust removal equipment for exhaust gas treatment and the SO2 gas absorption equipment become unnecessary, so that the operating cost can be reduced.
[0018]
(3) At the boiler radiation section entrance, the exhaust gas of the non-ferrous smelting blast furnace containing oxygen and SO2 is blown from the ceiling and side walls, so that the oxygen in the exhaust gas enters the exhaust gas of the non-ferrous smelting furnace treating the sulfide ore. By oxidizing the highly adherent sulfide dust contained in the boiler radiation space into sulfate, it is possible to prevent dust from adhering to the radiation wall and the stagnant part of the tube wall, and the boiler operation is stabilized. .
In addition, by blowing the gas at a flow velocity of 10 m / sec or more from the ceiling / side wall of the radiant section, it is possible to prevent the drift of the exhaust gas mainstream and suppress the contact with the pipe wall of dust in a high temperature semi-molten state. The mixing of the blown gas flow in the radiant part is promoted, and the sulfation reaction described above can proceed more stably.
[0019]
(4) When the non-ferrous smelting furnace exhaust gas containing oxygen and SO2 is diluted with air, the temperature can be controlled to keep the acid dew point or higher so that corrosion of the pipe can be prevented.
(5) The treatment of the exhaust gas from the smelting furnace can be performed very efficiently, and the exhaust gas treatment in the flash smelting furnace can be efficiently performed.
[0020]
[Brief description of the drawings]
FIG. 1 shows a processing flow which is an embodiment of exhaust gas processing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flash smelting furnace 2 Flash smelter boiler radiation part Ceiling exhaust gas inlet 3
Claims (3)
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| JP2002290360A JP4237463B2 (en) | 2002-10-02 | 2002-10-02 | Non-ferrous smelting furnace exhaust gas treatment method containing oxygen and SO2 in exhaust gas |
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| JP2002290360A JP4237463B2 (en) | 2002-10-02 | 2002-10-02 | Non-ferrous smelting furnace exhaust gas treatment method containing oxygen and SO2 in exhaust gas |
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| CN104596302A (en) * | 2014-12-09 | 2015-05-06 | 湖北丰利化工有限责任公司 | Comprehensive control system of deep well pump |
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