CN101274212A - Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof - Google Patents
Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof Download PDFInfo
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- CN101274212A CN101274212A CNA2007103024760A CN200710302476A CN101274212A CN 101274212 A CN101274212 A CN 101274212A CN A2007103024760 A CNA2007103024760 A CN A2007103024760A CN 200710302476 A CN200710302476 A CN 200710302476A CN 101274212 A CN101274212 A CN 101274212A
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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
- Y02P10/20—Recycling
Abstract
The invention discloses a device and a method used for reducing the exhaust of electric furnace steelmaking dioxin, comprising a bag-typed deduster which is communicated with the electric furnace by a flue gas pipeline and a loading device. The invention is characterized in that the pipeline between the electric furnace and the bag-typed deduster is sequentially communicated with a combustion settlement chamber and a temperature reduction device. The method comprises the steps as follows: the electric furnace adopts the molten iron hot charging technique; the steelmaking flue gas enters the combustion settlement chamber for sufficient combustion, then enters the temperature reduction device, with the temperature reduced from 800 to 1000 DEG C at the inlet to below 200 DEG C at the outlet within 1 to 3 seconds, and is finally exhausted after being disposed by the bag-typed deduster; wherein, the content of the dioxin is not more than 0.2ngTEQ/m<3>. The device and the method of the invention reduce the content of the dioxin, generate a plurality of saturated steam at the same time and have the advantages of saving energy and reducing the steelmaking cost.
Description
Technical field:
The present invention relates to smelting iron and steel, the Toxic that is specifically related in the smelting iron and steel flue gas is handled.
Background technology:
Dioxin is called as " the strongest poisonous substance of toxicity on the earth ", and it is that a kind of chloride strong toxic organic is learned material, exists hardly at occurring in nature, and have only by chemical synthesis and could produce, be the human at present the most fearful chemical substance of creating.In metallurgical industry, the chloride refuse in the steel scrap comprises the steel scrap that contains salt etc., and when the high-temperature flue gas that produces when electric furnace carries out pyrolytic semlting was cooled to below 600 ℃ more than 300 ℃, the ash particle in this moment flue gas was the catalyst that dioxin forms.Main in the world industrialized country has determined the permission emission standards all formulated the concrete measure of preventing and treating dioxin contamination on the Investigational basis in the past.
China has paid much attention to the potential danger of dioxin at present, and research has become one of key subjects of current China environmental science with the harm of control dioxin.In " steel and iron industry atmosphere pollutants emission standards " exposure draft that in September, 2007, China put into effect, the discharge capacity of dioxin in the electric furnace flue gas has been done clear and definite restriction, its concentration of emission limit value is 0.2ngTEQ/m
3, and require in enforcement on July 1 in 2010.But how to control the discharging of dioxin in the EAF Steelmaking Process, yet there are no relevant report.Therefore, the control technology of research and development dioxins discharge during steel smelting in electric furnace has been the extremely urgent task of metallurgical industry.
Summary of the invention:
The technical problem to be solved in the present invention provides a kind of devices and methods therefor that reduces dioxins discharge during steel smelting in electric furnace, the discharging of dioxin is reached or is lower than pertinent regulations.The present invention is achieved through the following technical solutions:
Reduce the device of dioxins discharge during steel smelting in electric furnace, comprise the sack cleaner, the negative pressure device that are communicated with electric furnace by flue, characteristics are to be communicated with combustion settling chamber, heat sink on the pipeline between electric furnace and the sack cleaner successively.
Described heat sink is made of housing and heat pipe, and the periphery of heat pipe dividing plate and the internal face of housing are tightly connected (the housing inner chamber is separated into two), and the evaporator section of heat pipe is positioned at chamber 8, and condensation segment is positioned at chamber 9; Described chamber 8 by pipeline 3 ', 3 " be communicated with combustion settling chamber, sack cleaner, the heat pipe of condensation segment is provided with the cooling medium chuck, and the cooling medium chuck of heat pipe is communicated with drum by pipeline.
Reduce the method for dioxins discharge during steel smelting in electric furnace, comprise the following steps:
(1) the electric furnace electric furnace adopts the liquid iron charging technology, and after its steel-making flue gas entered combustion settling chamber from pipeline 3, ventilation shaft was dried in combustion settling chamber, and flue gas is fully burned, and ignition temperature is more than 1000 ℃;
(2) under the negative pressure device effect, the flue gas of step (1) is from pipeline 3 ' enter in the chamber 8 of heat sink housing, and pipeline 3 ' input gas temperature is 800-1000 ℃;
(3) flue gas carries out Rapid Thermal exchange with heat pipe evaporator section in the chamber 8 of heat sink, and flue-gas temperature is from 800-1000 ℃ of import, drops to pipeline 3 " below 200 ℃ of outlet second through 1-3;
(4) flue gas of step (3) is from pipeline 3 " enters sack cleaner, the final discharge flue gas after handling through sack cleaner, the dioxin≤0.2ngTEQ/m that wherein contains
3
Beneficial effect of the present invention:
One, the present invention's combustion settling chamber is set to cuboid or ellipsoid, the flue import and export is arranged at the top, two ends of long axis direction respectively, make flue gas be arranged certain time of staying, thereby help the abundant burning of flue gas, obtain the maximization of dioxin pyrolytic with this indoor.
Two, heat pipe is a kind of novel high-performance heat transfer components, and promptly in the system of an evacuated sealing, the phase-state change that relies on the inner fluid of packing into is transmitted heat, and the heat pipe medium position is provided with dividing plate, and dividing plate one side is an evaporator section, and opposite side is a condensation segment.Utilization of the present invention has the hot pipe technique of efficient heat transfer, with the high-temperature flue gas more than 800 ℃ 2 seconds left and right sides in the time, be plummeted to below 200 ℃, make the temperature that helps dioxin and produce (below 600 ℃ more than 300 ℃) have only moment, therefore stoped the once more generation of dioxin in the flue gas processing procedure effectively.
Three, the present invention further is adsorbed in the dust granule surface with the dioxin that contains in the flue gas by sack cleaner, and therefore final content of discharging dioxin in the flue gas is lower than 0.2ngTEQ/m
3
Four, the present invention produces a large amount of saturated vapors in the dioxins concentration in reducing flue gas, has the advantage of energy savings, reduction steel-making cost.
Description of drawings:
Fig. 1 is a connection diagram of the present invention;
Fig. 2 is a heat sink cross-sectional schematic among Fig. 1.
The specific embodiment:
As shown in Figure 1, reduce the device of dioxins discharge during steel smelting in electric furnace, comprise the sack cleaner 17, the negative pressure device 10 that are communicated with electric furnace 15 by flue, on the pipeline between electric furnace 15 and the sack cleaner 17, be communicated with combustion settling chamber 1, heat sink 2 successively.
Still as shown in Figure 1, combustion settling chamber 1 is a cuboid, and flue 3,3 ' import and export are arranged at the top, two ends of combustion settling chamber 1 long axis direction respectively, also is provided with intake stack 4 on the top of combustion settling chamber 1.Combustion settling chamber 1, flue 3,3 ' outer wall be provided with heat-insulation layer (diagram is not provided).
As shown in Figure 2, described heat sink 2 constitutes (the heat pipe quantity in the housing is according to the needs setting of heat exchange amount) by housing 5 and heat pipe 6, heat pipe 6 horizontal sextant angles are that 30 degree are arranged at (horizontal sextant angle can be provided with to spend greater than 10 degree, less than 90 as required) in the housing 5, and its periphery is provided with fin 16; The periphery of the dividing plate 7 of heat pipe 6 and the internal face of housing 5 are tightly connected, and (present embodiment adopts and is welded to connect, the inner chamber of housing is separated into two), the evaporator section of heat pipe 6 is positioned at chamber 8, and condensation segment is positioned at chamber 9, and the condensation segment termination of heat pipe 6 adopts welding to be fixedly connected on housing 5; Still as shown in Figure 2, pipeline 3 ', 3 " import and export is arranged at bottom, the top of chamber 8 these end housing bodies 5 respectively, described chamber 8 by pipeline 3 ', 3 " be communicated with combustion settling chamber 1, sack cleaner 17; As shown in Figure 1, 2, heat pipe 6 condensation segments are provided with cooling medium chuck 11, the two ends of cooling medium chuck 11 adopt welding manner to be fixed on heat pipe 6 (also can adopt interference fit to connect), are communicated with each other, and chuck 11 is communicated with drum 14 by pipeline 12,13.
Reduce the method for dioxins discharge during steel smelting in electric furnace, comprise the following steps:
(1) after the steel-making flue gas of electric furnace entered combustion settling chamber 1 from pipeline 3, ventilation shaft 4 was dried in combustion settling chamber 1, and flue gas is fully burned, and ignition temperature is more than 1000 ℃;
(2) under negative pressure device 10 effect, the flue gas of step (1) is from pipeline 3 ' enter in the chamber 8 of heat sink, and pipeline 3 ' input gas temperature is 800-1000 ℃;
(3) flue gas carries out Rapid Thermal exchange with heat pipe evaporator section in the chamber 8 of heat sink housing, flue-gas temperature is from 800-1000 ℃ of import, through dropping to pipeline 3 about 2 seconds " below 200 ℃ of outlet;
(4) flue gas of step (3) is from pipeline 3 " enters sack cleaner, the final discharge flue gas after handling through sack cleaner, the dioxin≤0.2ngTEQ/m that wherein contains
3
(5) cooling medium of heat pipe condenser section is selected water for use, and the cooling water in the heat pipe chuck is taken away heat and produce a large amount of saturated vapors by pipeline and drum communication loop.
Claims (10)
1, reduces the device of dioxins discharge during steel smelting in electric furnace, comprise the sack cleaner, the negative pressure device that are communicated with electric furnace by flue, it is characterized in that: on the pipeline between electric furnace and the sack cleaner, be communicated with combustion settling chamber (1), heat sink (2) successively.
2, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 1, it is characterized in that: combustion settling chamber (1) is cuboid or ellipsoid, flue (3,3 ') import and export is arranged at the top, two ends of combustion settling chamber (1) long axis direction respectively, also is provided with intake stack (4) on the top of combustion settling chamber (1).
3, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 2 is characterized in that: the outer wall of combustion settling chamber (1), flue (3,3 ') is provided with heat-insulation layer.
4, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 1, it is characterized in that: described heat sink (2) is made of housing (5) and heat pipe (6), the periphery of the dividing plate (7) of heat pipe (6) and the internal face of housing (5) are tightly connected, the evaporator section of heat pipe (6) is positioned at the chamber (8) of housing (5), and condensation segment is positioned at chamber (9); Described chamber (8) by pipeline (3 ', 3 ") are communicated with combustion settling chamber (1), sack cleaner, the heat pipe of condensation segment (6) is provided with cooling medium chuck (11), cooling medium chuck (11) passes through pipeline (12,13) and is communicated with drum.
5, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 4 is characterized in that: pipeline (3 ', 3 ") import and export is arranged at bottom, the top of chamber (8) housing (5) respectively.
6, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 4 is characterized in that: the condensation segment termination of heat pipe (6) is fixedly connected on housing (5).
7, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 4 is characterized in that: heat pipe (6) horizontal sextant angle is spent greater than 10 degree, less than 90 and is arranged in the housing (5), and its periphery is provided with fin.
8, the device of reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 4 is characterized in that: described cooling medium chuck (11) two ends are fixed on heat pipe (6), are communicated with each other, and cooling medium wherein is a water.
9, reduce the method for dioxins discharge during steel smelting in electric furnace, it is characterized in that: comprise the following steps:
(1) electric furnace adopts the liquid iron charging technology, and after its steel-making flue gas entered combustion settling chamber (1) from pipeline (3), ventilation shaft (4) was dried in combustion settling chamber (1), and flue gas is fully burned, and ignition temperature is more than 1000 ℃;
(2) under negative pressure device (10) effect, the flue gas of step (1) enters from pipeline (3 ') in the chamber (8) of heat sink, and pipeline (3 ') input gas temperature is 800-1000 ℃;
(3) flue gas carries out Rapid Thermal exchange with heat pipe evaporator section in the chamber (8) of heat sink, and flue-gas temperature is from 800-1000 ℃ of import, drops to pipeline (below 200 ℃ of 3 ") outlet second through 1-3;
(4) (3 ") enter sack cleaner to the flue gas of step (3), the final discharge flue gas after handling through sack cleaner, the dioxin≤0.2ngTEQ/m that wherein contains from pipeline
3
10, the method for reduction dioxins discharge during steel smelting in electric furnace as claimed in claim 9, it is characterized in that: described step also comprises the interior heat pipe condenser section in chamber (9) of heat sink, cooling water in heat pipe and the chuck is taken away heat and produce a large amount of saturated vapors by pipeline and drum communication loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103024760A CN101274212A (en) | 2007-12-27 | 2007-12-27 | Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103024760A CN101274212A (en) | 2007-12-27 | 2007-12-27 | Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof |
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| CN101274212A true CN101274212A (en) | 2008-10-01 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250650A (en) * | 2011-07-01 | 2011-11-23 | 南通海鹰机电集团有限公司 | Temperature-constant blast furnace and converter coal gas purifying system |
| CN102338567A (en) * | 2011-08-29 | 2012-02-01 | 中冶赛迪工程技术股份有限公司 | Combustion settling chamber |
| WO2012038906A2 (en) | 2010-09-23 | 2012-03-29 | Tenova S.P.A. | Heat exchanger for the rapid cooling of flue gas of ironwork plants, apparatus for the treatment of flue gas in ironwork plants comprising such a heat exchanger and relative treatment method |
| CN104266499A (en) * | 2014-10-17 | 2015-01-07 | 中冶赛迪工程技术股份有限公司 | Scrap steel preheating electric furnace flue gas waste heat recovery device |
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
| CN105222600A (en) * | 2015-10-28 | 2016-01-06 | 深圳市龙瑞泰兴能源环境科技有限公司 | A kind of independent cracking room environmental protection metallurgical furnace and using method thereof |
| CN105695754A (en) * | 2014-11-27 | 2016-06-22 | 江苏康洁环境工程有限公司 | Method and device for removing NOX, SOX, dioxins and heavy metals from leaded exhaust gas as well as recovering lead dust |
-
2007
- 2007-12-27 CN CNA2007103024760A patent/CN101274212A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012038906A2 (en) | 2010-09-23 | 2012-03-29 | Tenova S.P.A. | Heat exchanger for the rapid cooling of flue gas of ironwork plants, apparatus for the treatment of flue gas in ironwork plants comprising such a heat exchanger and relative treatment method |
| WO2012038906A3 (en) * | 2010-09-23 | 2012-08-02 | Tenova S.P.A. | Heat exchanger for the rapid cooling of flue gas of ironwork plants, apparatus for the treatment of flue gas in ironwork plants comprising such a heat exchanger and relative treatment method |
| CN103154654A (en) * | 2010-09-23 | 2013-06-12 | 特诺恩股份公司 | Heat exchanger for the rapid cooling of flue gas of ironwork plants, apparatus for the treatment of flue gas in ironwork plants comprising such a heat exchanger and relative treatment method |
| US20130195138A1 (en) * | 2010-09-23 | 2013-08-01 | Tenova S.P.A. | Heat exchanger for the rapid cooling of flue gas of ironwork plants, apparatus for the treatment of flue gas of ironwork plants comprising such a heat exchanger and relative treatment method |
| CN103154654B (en) * | 2010-09-23 | 2016-02-24 | 特诺恩股份公司 | For cooling the heat exchanger of iron-smelter flue gas, equipment and method fast |
| CN102250650A (en) * | 2011-07-01 | 2011-11-23 | 南通海鹰机电集团有限公司 | Temperature-constant blast furnace and converter coal gas purifying system |
| CN102338567A (en) * | 2011-08-29 | 2012-02-01 | 中冶赛迪工程技术股份有限公司 | Combustion settling chamber |
| CN104266499A (en) * | 2014-10-17 | 2015-01-07 | 中冶赛迪工程技术股份有限公司 | Scrap steel preheating electric furnace flue gas waste heat recovery device |
| CN105695754A (en) * | 2014-11-27 | 2016-06-22 | 江苏康洁环境工程有限公司 | Method and device for removing NOX, SOX, dioxins and heavy metals from leaded exhaust gas as well as recovering lead dust |
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
| CN105222600A (en) * | 2015-10-28 | 2016-01-06 | 深圳市龙瑞泰兴能源环境科技有限公司 | A kind of independent cracking room environmental protection metallurgical furnace and using method thereof |
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Open date: 20081001 |