CN101458038A - Stainless steel GOR refining furnace dry cleaning and recovering process - Google Patents
Stainless steel GOR refining furnace dry cleaning and recovering process Download PDFInfo
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- CN101458038A CN101458038A CNA2008102497367A CN200810249736A CN101458038A CN 101458038 A CN101458038 A CN 101458038A CN A2008102497367 A CNA2008102497367 A CN A2008102497367A CN 200810249736 A CN200810249736 A CN 200810249736A CN 101458038 A CN101458038 A CN 101458038A
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Abstract
The invention discloses a dry purification recovery process for a stainless steel GOR refining furnace. The process comprises the following steps: the temperature of fume is reduced by a cooling duct so that the temperature of the fume is reduced from 1,450 DEG C or so to 800-1000 DEG C, then the fume with a temperature of 800-1000 DEG C undergoes vapor cooling for temperature reduction by means of spraying in atomized water so that the temperature of the fume is further reduced to 180-200 DEG C, and coarse bug dust is collected at the same time; the preliminarily-treated fume with a temperature of 180-200 DEG C again undergoes high-voltage electrostatic dust collection so that dust concentration in the fume is reduced to be lower than 10 mg/Nm<3>; when oxygen content in the fume is less than 2 percent and CO gas content is greater than 45 percent, the fume is cooled by a coal gas cooler to have a temperature of 70 DEG C and then enters a gasometer; when the oxygen content in the fume is not less than 2 percent, the fume enters a diffusing chimney and then is discharged into the atmosphere after being set fire to and burnt; and the bug dust collected in a high-voltage and electrostatic state is discharged for sintering. The invention has high efficiency, does not cause secondary pollution or requires wastewater treatment, is convenient for management and maintenance and meanwhile prevents the generation of a great amount of poisonous wastewater or sludge.
Description
Technical field
The present invention relates to the cleaning and recovering process that a kind of iron and steel metallurgical industry is used for the used GOR refining furnace of stainless steel smelting.
Background technology
At present, the udst separation of the used GOR refining furnace of stainless steel smelting is reclaimed the main gas wet (OG method) that adopts and is purified recovery, the shortcoming that the wet-treating technology exists: the one, and the dust content of gas after handling is higher, reaches 100mg/m
3More than, utilize this coal gas, need Wet-electric duster to be set and carry out smart dedusting at the rear portion, its dust-laden mass concentration is reduced to 10mg/m
3Below; The 2nd, there is secondary pollution in system, and its sewage need be handled; The 3rd, system's resistance is decreased big, so energy consumption is big, floor space is big, and environment protection treating and management difficulty are bigger.
Summary of the invention
The present invention is directed to the problem that existing stainless steel GOR refining furnace dedusting technology exists, the stainless steel GOR refining furnace dry cleaning and recovering process that a kind of efficient height is provided, does not have secondary pollution and sewage disposal, be convenient to administer and maintain.
Stainless steel GOR refining furnace dry cleaning and recovering process of the present invention is by the following technical solutions:
This technology is earlier flue gas to be lowered the temperature through cooling stack, make flue-gas temperature reduce to 800 ℃～1000 ℃ by about 1450 ℃, then 800 ℃～1000 ℃ flue gas is carried out the evaporative cooling cooling by spraying into atomized water, make flue-gas temperature continue to reduce to 180 ℃～200 ℃, collect meal dirt simultaneously; 180 ℃～200 ℃ flue gas through preliminary treatment carries out high voltage electrostatic dust collection again, makes its dust content reduce to 10mg/Nm
3Below, when oxygen content in the flue gas＜2% and CO gas content greater than 45% the time, be cooled to 70 ℃ by gas cooler, enter gas chamber, when oxygen content in the flue gas 〉=2%, then enter and diffuse chimney, be disposed to after ignition in the atmosphere, the dust under high-pressure electrostatic is collected is discharged sintering.
The present invention adopts dry method high-pressure electrostatic precipitation technology, the efficient height, does not have secondary pollution and sewage disposal, is convenient to administer and maintain.Steel per ton can be saved electricity 1.1 degree, economizes on water 3 tons, and the flue dust of recyclable 10.5 kilograms of iron content more than 75% and the high-quality coal gas that is equivalent to 20 liters of left and right sides fuel oil.In addition, 2.5 yuans of the producing costs of also can saving per ton.In addition, after containing flue dust sintering pressure balls such as chromium oxide, iron powder, can replace converter steel scrap and ore.Gas dust concentration is reduced to below the 10mg/Nm3, stopped the generation of a large amount of poison sewages, mud simultaneously.
Description of drawings
Accompanying drawing is the principle schematic of stainless steel GOR refining furnace dry cleaning and recovering process of the present invention;
Wherein, 1, the GOR refining furnace, 2, devaporizer, 3, the cylinder type electric cleaner, 4, axial flow blower, 5, gas cooler, 6, gas chamber, 7, diffuse chimney, 8, cooling stack.
The specific embodiment
As shown in drawings, the existing equipment of stainless steel GOR refining furnace dry cleaning and recovering process employing of the present invention has devaporizer 2, cylinder type electric cleaner 3, axial flow blower 4 and gas cooler 6.
Be provided with atomizer, attemperating unit and electric control system in the devaporizer 2, its effect is with the GOR refining furnace flue gas through cooling stack, further be reduced to below 400 ℃ again, it is modified on the other hand flue gas to be carried out humidification, to reduce the ratio resistance of flue dust, carry out thick dedusting simultaneously, help the electric cleaner dust removing effects.
Cylinder type dry method electric cleaner 3 mainly partly is made up of cylindrical shell and the part of gathering dust etc., owing to contain a large amount of CO fuel gas in the converter gas, easily produce blast, for improving the bearing capacity of deduster, therefore its shell is designed to cylindrical shape, and on importing and exporting, be provided with corresponding safe explosion relief door, to eliminate issuable in process of production pressure surge.Electric cleaner generally is furnished with four electric fields, the dust contained flue gas concentration requirement of handling through electric cleaner is less than 10mg/Nm3, the gather dust utmost point of part of electric cleaner is joined form and must be adapted to the process characteristic that converter requires, the general printed line structure that adopts, the dust that dust collecting electrode captures is by mechanical vibrator and a kind of special apparatus for ash of scraping, dust is focused in the chain-linked conveyer of bottom, dust is discharged by Double-deck cinder discharge valve.
Adopt the stainless steel GOR refining furnace dry cleaning and recovering process detailed process of the said equipment as follows:
The flue gas (coal gas) that GOR refining furnace 1 produces is reduced to 800 ℃～1000 ℃ about cooling stack 8 makes flue-gas temperature by 1450 ℃, enter devaporizer 2 then, by spraying into the atomized water cooling, make flue gas (coal gas) temperature continue to reduce to 180 ℃～200 ℃, simultaneously as modifier treatment, flue dust is reduced than resistance, and collect meal dirt.180 ℃～200 ℃ flue gas through preliminary treatment enters cylinder type electric cleaner 3, and by high voltage electrostatic dust collection, flue gas (coal gas) reduces to below the 10mg/Nm3 its dust content through further purifying, and leads to the coal gas switching station by axial flow blower 4.When oxygen content in the flue gas＜2% and CO gas content reach recyclable condition, enter gas cooler 6 by switching station coal gas is cooled to 70 ℃, enter gas chamber 5 then.When oxygen content in the flue gas 〉=2%, then enter and diffuse chimney 7 and carry out the torch operational mode by switching station, after ignition, be disposed in the atmosphere.Electric cleaner 3 collected dust are discharged by conveyer, carry out sintering hot pressing, utilize again.
The meal dust quantity of sedimentation in devaporizer 2 is 5Kg～8Kg/t steel, and the fine powder dust quantity that captures in electric cleaner 3 is 10Kg～13Kg/t steel, and the iron-holder in the dust is about in the of 70%, and the iron-holder in the meal is higher, can be used through suitable processing.Main method is that the dust under collecting is heated to 500 ℃～600 ℃, under the condition that does not add any additives, hot pressing balling-up in cuber, the ball that meal dirt is pressed can substitute steel scrap and use, and the ball that fine dust is pressed can substitute the cooling agent that ore is done pneumatic steelmaking.
Above-mentioned technology unavoidably produces electric spark, in case CO in the flue gas and O because the cylinder type electric cleaner 3 that adopts is to carry out smart dedusting by the discharge ionization of high voltage electric field
2Concentration reaches explosion limit (oxygen content 12.4%--72.3% is the explosion limit scope in the coal gas), will set off an explosion the explosion venting valve of deduster is opened, cause the stokehold can't continue blowing, also the air-introduced machine behind the deduster is produced simultaneously and impact, thereby cause the uneven Heng of air-introduced machine rotor, reduce service life.Therefore, the venting of dust explosion of must taking measures to avoid producing, the explosion precaution of taking has:
1.GOR converter operation
1) definite earlier normal with the electric cleaner communication before the blowing, the electric precipitation display system is ready to.Note falling the cover operation.Often keep fire door totally not have accumulated slag, movable gas hood can drop to the position.
2) blowing oxygen quantity will be controlled at low discharge at the beginning, (is not more than 5000m
3/ h), transfer to normal discharge after one minute.
3) reinforced process is wanted multiple batches of small lot, prevents the instantaneous excessive venting of dust explosion that causes of exhaust gas volumn.
2. dust removal operation
1) definite earlier normal with stokehold device communication before the blowing, the electric precipitation display system is ready to.Note reminding the stokehold to fall the cover operation.
2) temperature of carrying out devaporizer is controlled, and regulates discharge, prevents the too high stokehold blow off that causes of temperature, the low excessively wet ash in grey storehouse that causes of temperature.
3) control rotation speed of fan well.Prevent the fire door phenomenon of smoldering.
Claims (1)
1. stainless steel GOR refining furnace dry cleaning and recovering process, it is characterized in that, this technology is earlier flue gas to be lowered the temperature through cooling stack, make flue-gas temperature reduce to 800 ℃～1000 ℃, then 800 ℃～1000 ℃ flue gas is carried out the evaporative cooling cooling by spraying into atomized water, make flue-gas temperature continue to reduce to 180 ℃～200 ℃, collect meal dirt simultaneously; 180 ℃～200 ℃ flue gas through preliminary treatment carries out high voltage electrostatic dust collection again, makes its dust content reduce to 10mg/Nm
3Below, when oxygen content in the flue gas＜2% and CO gas content greater than 45% the time, be cooled to 70 ℃ by gas cooler, enter gas chamber, when oxygen content in the flue gas 〉=2%, then enter and diffuse chimney, be disposed to after ignition in the atmosphere, the dust under high-pressure electrostatic is collected is discharged sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102497367A CN101458038A (en) | 2008-12-30 | 2008-12-30 | Stainless steel GOR refining furnace dry cleaning and recovering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102497367A CN101458038A (en) | 2008-12-30 | 2008-12-30 | Stainless steel GOR refining furnace dry cleaning and recovering process |
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| Publication Number | Publication Date |
|---|---|
| CN101458038A true CN101458038A (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102497367A Pending CN101458038A (en) | 2008-12-30 | 2008-12-30 | Stainless steel GOR refining furnace dry cleaning and recovering process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972702A (en) * | 2010-09-26 | 2011-02-16 | 中冶长天国际工程有限责任公司 | Comprehensive dust recycling technology and system for sintering machine head electric precipitation |
| CN104374209A (en) * | 2014-05-29 | 2015-02-25 | 山西太钢不锈钢股份有限公司 | Method for recovering sintering waste heat by using fan and rear guide vane of the fan |
-
2008
- 2008-12-30 CN CNA2008102497367A patent/CN101458038A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972702A (en) * | 2010-09-26 | 2011-02-16 | 中冶长天国际工程有限责任公司 | Comprehensive dust recycling technology and system for sintering machine head electric precipitation |
| CN101972702B (en) * | 2010-09-26 | 2014-06-04 | 中冶长天国际工程有限责任公司 | Comprehensive dust recycling technology and system for sintering machine head electric precipitation |
| CN104374209A (en) * | 2014-05-29 | 2015-02-25 | 山西太钢不锈钢股份有限公司 | Method for recovering sintering waste heat by using fan and rear guide vane of the fan |
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Open date: 20090617 |