CN101221020A - Electric furnace residual heat utilization device - Google Patents
Electric furnace residual heat utilization device Download PDFInfo
- Publication number
- CN101221020A CN101221020A CNA200810018739XA CN200810018739A CN101221020A CN 101221020 A CN101221020 A CN 101221020A CN A200810018739X A CNA200810018739X A CN A200810018739XA CN 200810018739 A CN200810018739 A CN 200810018739A CN 101221020 A CN101221020 A CN 101221020A
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- CN
- China
- Prior art keywords
- waste heat
- electric furnace
- blast furnace
- combustion chamber
- flue gas
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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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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention discloses a waste heat recycling device used for an electric furnace, comprising a waste heat boiler arranged on a high temperature flue gas discharge flue of the electric furnace. A blast furnace gas combustion chamber controlled by a regulating valve is arranged in a radiation heated face of the waste heat boiler. In a smelting period, a burner of the blast furnace gas combustion chamber is in a normal-burning state. The blast furnace combustion chamber is in burning state when without emission of high temperature flue gas. The blast furnace firebox is the lowest burning state when with emission of high temperature flue gas. The waste heat recycling device used for an electric furnace has the advantages that a water cooling flue which is required by a steel-making electric furnace and needs high investment and high operation cost but has no economical benefit can be completely displaced; a heat pipe waste heat boiler generating incontinuous low-pressure saturation steam is displaced too. The waste heat recycling device used for electric furnaces can continuously and stably generate steam with intermediate temperature and pressure used for production or electricity generation.
Description
Technical field
The present invention relates to a kind of electric furnace residual heat using device, this device is applied in the iron and steel enterprise in the steel-smelting electric furnace flue, realizes the purpose of UTILIZATION OF VESIDUAL HEAT IN.
Background technology
Electric furnace is the bigger equipment that consumes energy, and discharges a large amount of high-temperature flue gas (1000-1400 ℃) in its use, and because of the discharging of these high-temperature flue gas has discontinuity and the very high characteristics of dustiness, so its contained secondary energy sources can't effectively utilize always.In order to satisfy emission request, water-cooled flue must be set, and cooling tower and dust arrester, make high-temperature flue gas outwards discharging after cooling purifies.For this reason, except that the many equipment investments of needs, also need to consume a large amount of cooling waters and electric energy, operating cost is very high, but does not have any economic benefit.At present, the electric furnace more than 99% all adopts this mode to discharge flue gas.The high-temperature flue gas discharging was arranged in about 45 minutes in smelting cycle of electric furnace, and do not have the high-temperature flue gas discharging in about 15 minutes, this just makes and can not adopt conventional waste heat boiler to reclaim this part fume afterheat, because conventional boiler can not intermittently use.China Aug. 1st steel mill, Laiwu steel mill use heat pipe waste heat boiler to reclaim the electric furnace flue gas waste heat at present, steam with waste heat production changes in flow rate (not having sometimes immediately), and this steam is that (with 100 tons electric furnaces is example to the lower saturated vapor of pressure, the steam pressure of producing is 0.8MPa, temperature is 180 ℃, output is 10 tons/hour), can only use for life.
Summary of the invention
Goal of the invention: the objective of the invention is at the deficiencies in the prior art, provide a kind of fume afterheat that utilizes electric furnace to produce the electric furnace residual heat using device of the medium temperature and medium pressure steam of continous-stable.
Technical scheme: electric furnace residual heat using device of the present invention, comprise the waste heat boiler that is arranged on the electric furnace high-temperature flue gas discharging flue, it is characterized in that in this waste heat boiler radiant type heating surface, being provided with blast furnace gas combustion chamber by control valve control.
In smelting cycle, the burner of described blast furnace gas combustion chamber is in normal combustion state, and promptly no matter between the high-temperature flue gas draining period, still during not having fume emission, the blast furnace gas combustion chamber all is in normal combustion state, to guarantee the safety of boiler.
The fired state of blast furnace gas combustion chamber is controlled by the temperature at high-temperature flue gas entry place mainly.When not having the high-temperature flue gas discharging, the temperature of porch lower (as being lower than 900 ℃), this moment, flow control valve started, and the opening of blast furnace gas is strengthened, and the blast furnace gas combustion chamber is in fired state; When the temperature of porch is higher high-temperature flue gas when discharging arranged promptly, control valve makes the openings get smaller of blast furnace gas, and the blast furnace gas combustion chamber keeps minimum fired state.
Consider that the interior temperature of flue is subjected to the influence that increases gas and other factors of electric furnace often, the fired state of blast furnace gas combustion chamber also is subjected to the control of boiler steam quantum of output, promptly according to the aperture of the variation correction control valve of vapor volume, to guarantee the stable of steam quantum of output.
Beneficial effect: advantage of the present invention is: 1, thoroughly having replaced steel-smelting electric furnace, that investment will be set is big, the operating cost height, and have no the water-cooled flue device of economic benefit.2, replaced the heat pipe waste heat boiler device of producing interrupted low pressure saturated vapor.3, this electric furnace residual heat using device can produce fully continous-stable the medium temperature and medium pressure steam (3.9Mpa, 260 ℃, 20t/h), for producing or for generating or heating use.
Description of drawings
Accompanying drawing is a process structure schematic diagram of the present invention.
The specific embodiment
The function of regular waste heat boiler of electric furnace residual heat using device collection of the present invention and regular blast furnace gas boiler is an one, therefore can be referred to as the combined type waste heat boiler.As shown in the figure, the high-temperature flue gas that electric furnace 1 is discharged imports combined type waste heat boiler 3 through flue after importing expansion chamber 2 udst separations by flue again.High-temperature flue gas is passed to pure water in the pipe to the part heat in waste heat boiler radiant type heating surface, make the part pure water become steam, flue-gas temperature is reduced to below 800 ℃, the contained dust of flue gas this moment does not have caking property, flue gas enters waste heat boiler convection type heating surface again and carries out heat exchange, has more pure water to become steam here.Temperature is reduced to and is entered deduster 4 after 180 ℃ flue gas leaves the combined type waste heat boiler, introduces halogen 6 through the flue gas of udst separation once more by smoking of air-introduced machine 5, discharges atmosphere at last.
Bottom in waste heat boiler radiant type heating surface is gas burner 7, this gas burner is connected with blast furnace gas pipeline 8, on blast furnace gas pipeline 8, be provided with control valve 9, this control valve 9 is subjected to the control of the temperature and the boiler steam quantum of output at smoke inlet place, promptly can in flue, be provided with temperature sensor, in the vapor outlet port pipeline, be provided with flow sensor, by the automatic work of conventional control technology by-pass valve control.
The quantity combusted that the burner of combined type waste heat boiler (combustion chamber) must be regulated blast furnace gas according to the high-temperature flue gas cyclically-varying that electric furnace is discharged, the electric furnace flue gas waste heat that the combined type waste heat boiler is obtained adds that the summation of blast furnace gas heat is basicly stable.Thereby the steam that waste heat boiler is produced is also stablized continuously.Because it is very high that electric furnace is discharged the flue-gas temperature that flue gas and blast furnace gas burning produce, so in 100 tons electric furnace, this combined type waste heat boiler fully can output 3.9Mpa, 260 ℃, the superheated vapor of 20T/h.
Claims (4)
1. an electric furnace residual heat using device comprises the waste heat boiler that is arranged on the electric furnace high-temperature flue gas discharging flue, it is characterized in that being provided with in this waste heat boiler radiant type heating surface the blast furnace gas combustion chamber by control valve control.
2. electric furnace residual heat using device according to claim 1 is characterized in that the burner of blast furnace gas combustion chamber is in normal combustion state.
3. electric furnace residual heat using device according to claim 2, it is characterized in that the blast furnace gas combustion chamber burner controlled by the temperature in the flue by control valve.
4. electric furnace residual heat using device according to claim 3, it is characterized in that the blast furnace gas combustion chamber burner be subjected to the flow-control of boiler steam by control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810018739XA CN101221020A (en) | 2008-01-22 | 2008-01-22 | Electric furnace residual heat utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810018739XA CN101221020A (en) | 2008-01-22 | 2008-01-22 | Electric furnace residual heat utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101221020A true CN101221020A (en) | 2008-07-16 |
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ID=39631008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810018739XA Pending CN101221020A (en) | 2008-01-22 | 2008-01-22 | Electric furnace residual heat utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101221020A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620571A (en) * | 2012-04-10 | 2012-08-01 | 上海瑞恩能源投资有限公司 | Waste-heat power generating system in smelting process of rotary kiln and ore-smelting electric furnace |
| CN103409590A (en) * | 2013-08-20 | 2013-11-27 | 陕西钢铁集团有限公司 | Generating system using medium-pressure saturated superheated steam |
-
2008
- 2008-01-22 CN CNA200810018739XA patent/CN101221020A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620571A (en) * | 2012-04-10 | 2012-08-01 | 上海瑞恩能源投资有限公司 | Waste-heat power generating system in smelting process of rotary kiln and ore-smelting electric furnace |
| CN103409590A (en) * | 2013-08-20 | 2013-11-27 | 陕西钢铁集团有限公司 | Generating system using medium-pressure saturated superheated steam |
| CN103409590B (en) * | 2013-08-20 | 2015-08-05 | 陕西钢铁集团有限公司 | The power generation system of saturated superheated vapor is pressed in a kind of utilization |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080716 |