CN101108766A - Oxygen-enriched combustion energy efficient technology for float glass melting furnaces - Google Patents
Oxygen-enriched combustion energy efficient technology for float glass melting furnaces Download PDFInfo
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- CN101108766A CN101108766A CNA2006100989387A CN200610098938A CN101108766A CN 101108766 A CN101108766 A CN 101108766A CN A2006100989387 A CNA2006100989387 A CN A2006100989387A CN 200610098938 A CN200610098938 A CN 200610098938A CN 101108766 A CN101108766 A CN 101108766A
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention relates to the floating glass melting furnace enrichment oxygen combustion energy-saving technology. The pure oxygen or the oxygen enriched air produced in the hydrogen-nitrogen station of the floating glass plant is fully mixed with the purified air in a highly-efficient air mixer to produce the air (oxygen enriched air) with the oxygen content of 31 per cent to 32 per cent; the oxygen enriched air is sent to an automatic communator via a pressure-regulating system, and then enters an oxygen enriched air heat exchanger, and is led to an oxygen enriched air nozzle after preheat by a metallic hose with high temperature which is arranged below an oil gun to participate in the combustion. The above processes are called local oxygen increasing and enrichment oxygen combustion technology. The maximum characteristic of the enrichment oxygen combustion technology is that the local oxygen increasing changes the flame characteristic and makes the flame characteristic form the ladder type combustion. The lower part of the flame has ideal high temperature, strengthens the heat transfer of the flame to the glass liquid and is beneficial for melting the glass as well as improves the melting rate. While the temperature on the upper part of the flame is obviously reduced, thus reaching the effect of protecting the crown of the melting furnace and the breast wall. The enrichment oxygen combustion technology not only saves 5 per cent to 8 per cent energy and reduces the environment protection, but also improves the yield and quality of the glass and prolongs the life of the melting furnace, which brings considerable economic benefits and social benefits for the floating glass production industry.
Description
The present invention relates to a kind of oxygen-enriched combustion energy efficient technology for float glass melting furnaces.
In recent years, along with going deep into of glass melter energy-saving consumption-reducing technological research, both at home and abroad the expert at exploitation energy-saving glass prescription, optimize the glass melter structure, improve the glass melter control techniques, the insulation of reinforced glass melting furnaces and UTILIZATION OF VESIDUAL HEAT IN etc. realize that the research of glass melter energy-saving means is quite ripe.In today that energy dilemma increases the weight of day by day, glass melter is to the development that has restricted glass industry of depending on unduly of the high-quality energy (heavy oil, Sweet natural gas etc.).Under this background, realize that melting furnaces are further energy-saving and cost-reducing, oxygen-enriched combustion technology arises at the historic moment.
Oxygen-enriched combustion technology is to be higher than 21% oxygen-rich air with oxygen level to replace a kind of efficient overheavy firing technology of air as combustion-supporting gas.No matter its characteristics are it is that combustion air or combustion exhaust volume all reduce to some extent, combustion velocity is accelerated, and flame temperature improves, and this has improved the thermo-efficiency of melting furnaces effectively, and melting rate increases, and the glass metal unit heat consumption reduces.Flue gas generation and NOx growing amount reduce, and then make the flue gas purification system running more reliable, and dust pollution reduces greatly.Studies show that: oxygen-enriched combustion technology not only can be saved a large amount of energy, reduces environmental pollution, and can improve output, the quality of glass, prolongs melting furnace life-span.This technology will be brought considerable economic and social benefit for the float glass industry.
A kind of oxygen-enriched combustion energy efficient technology for float glass melting furnaces of the present invention, it is characterized in that: float glass smelting kiln adopts " local oxygen enriching " and " gradient burning " technology, makes the oxygen-rich air that oxygen level is 31%-32% with pure oxygen (oxygen concn is more than 99%) or high density oxygen enrichment that float glass factory nitrogen hydrogen station produces.Oxygen-rich air and the air that purified are in the efficient gas mixing tank behind the thorough mixing (three grades are mixed), send in the automatic commutator through voltage-regulating system, enter oxygen-rich air interchanger (being installed in the Yao Qiang bottom, the heat that utilizes body of wall to shed) again and import the oxygen enrichment nozzle by the hot metal flexible pipe.Spray into oxygen-rich air in the flame bottom, change flame characteristics, flame is divided into three different zones, flame top is the oxygen-starved area, can prevent that big arch is overheated; The middle part is the ordinary combustion district; The high-temperature zone is formed at the bottom, to strengthen the fusing to admixtion.Oxygen rich gas sprays in the kiln with certain angle and speed, and liquid level furthers flame under the effusive effect.Because of oxygen concn in the combustion-supporting medium of flame below is higher than the flame top, flame is rapid.The below temperature obviously raises, and flame is directly to relative increasing of radiative transfer of admixtion and liquid level like this.Arch top temperature is then corresponding to descend the corresponding decline with the exhanst gas outlet temperature of the heat radiation of kiln top surface to some extent.Thereby the thermo-efficiency of melting furnaces obtains corresponding raising.
The oxygen-enriched combustion-supporting technology is used for energy-conservation and reduces the mechanism of polluting
1 improves flame temperature, impels burning fully
After oxygen-rich air participated in burning, nitrogen amount reduced relatively, and oxygen molecule can contact with combustiblematerials fully, reaches perfect combustion, and flame temperature is to improve along with the increase of oxygen proportion in the oxygen-rich air.And accelerated the heat transfer rate of radiation, conduction, convection current three kinds of forms.
The raising of flame temperature and the increase of oxygen content promote full combustion of fuel, and combustiblematerials significantly reduces in the waste gas, has improved fuel availability, and has reached environment protecting.
2 accelerate combustionvelocity, promote burning fully
The combustionvelocity of fuel in air/pure oxygen differs very big, is 280cm/s to the maximum as the aerial combustionvelocity of hydrogen, is 1175cm/s in pure oxygen, is aerial 4.2 times, and Sweet natural gas is then up to 10.7 times.
The raising of combustionvelocity causes fuel burning out in melting pool fully, has stopped the phenomenon that burns away in port and regenerator.
3 reduce the ignition temperature of fuel
The ignition temperature of fuel is not a constant, and for example CO is 609 ℃ in normal air, only is 388 ℃ in oxygen.Can reduce the fuel burning-point with oxygen-enriched combustion-supporting, improve the release of flame intensity, increase heat.
4 reduce the free air delivery after the burning
Participate in burning with normal air, about 4/5ths nitrogen does not only participate in combustion-supporting, also will take away a large amount of heats.As use oxygen-enriched combustion-supporting, and nitrogen amount will reduce, so the free air delivery after the burning also reduces, thermosteresis reduces, and the general every increase by 1% of oxygen concn, exhaust gas volumn descends 2%～4.5% approximately, thereby can improve efficiency of combustion etc.
From the practical situation of using, general oxygen-enriched combustion-supporting can reduce by 1/4～1/5 free air delivery.
5 increase heat utilization ratio
When Heating temperature is 1300 ℃, be 42% with its heat utilization efficiency of ordinary air combustion, and burn that heat utilization efficiency increases to 56% with the oxygen-rich air of oxygen level 26%; Oxygen-enriched combustion-supporting could increase to the utilization ratio of heat, and oxygen-rich concentration is big more, and Heating temperature is high more, and the ratio that is increased is also just obvious more, and energy-saving effect is just good more naturally!
6 reduce the air excess system
Replace air-breathing with oxygen enrichment, can suitably reduce coefficient of excess air, fuel consumption is with regard to corresponding minimizing like this, thus save energy.
Compare with the traditional combustion technology, glass melter adopts this invention technology can give that melting furnaces are energy-conservation to bring following effect:
(1) improves refining quality
Adopt oxygen-enriched combusting, particularly positive effect is arranged at the melting furnaces smelting material area.In glass melter was produced, the state of combustion of oil preferably is divided into three zones: flame top was the oxygen-starved area, can prevent that so big arch is overheated; The middle part is the ordinary combustion district; The high-temperature zone is formed as far as possible at the bottom, to strengthen the fusing to glass batch.Oxygen enrichment spray (rifle) mouth is installed in appropriate location below oil burner, has accelerated combustionvelocity, has increased flame rigidity and flame is pressed close to the bed of material, improved the thermo-efficiency of flame, the flame radiaton temperature of glass liquid can improve about 100 ℃, and the admixtion fusion speeds up, and improves melting rate more than 10%.The also corresponding raising of refining quality simultaneously.
(2) alleviate scaling loss to melting furnaces
Oxygen-enriched combusting has quickened burning, and combustion processes is finished in kiln substantially, and the inflammable gas that enters regenerator reduces, and alleviates the scaling loss to checker brick.Adopt the spray gun bottom that the oxygen enrichment nozzle is installed and to make the flame formation partial combustion, because spraying into of oxygen enrichment overcome anoxia phenomenon, the flame temperature of lower is improved, and the temperature on flame top decrease in the flame bottom, make melting furnaces arch top temperature descend about 20 ℃～30 ℃, alleviate scaling loss big arch.Prolong melting furnaces work-ing life, create favorable conditions in particular for big arch insulation.
(3) energy-saving and cost-reducing
Need oxygen during fuel combustion, it is normally provided by airborne oxygen, contains oxygen and only account for 21% participation burning in combustion air, and all the other most of nitrogen of 79% are not participated in burning, taken away a large amount of heats, reduced the effective rate of utilization of fuel, the corresponding fuel consumption that increased.When burning with 27% oxygen-rich air, it is about 20% that heat that waste gas is taken away reduces, the corresponding thermosteresis that reduced.Moreover oxygen-enriched combusting makes heavy oil combustion more complete, has reduced heavy oil consumption., participate in burning and will have remarkable energy saving effect greater than 21% oxygen-rich air with oxygen level.Furnace temperature is high more, utilizes the energy-saving effect of oxygen-enriched combustion-supporting technology obvious more, and for example furnace temperature is in the time of 1600 ℃, and the oxygenized air combustion supporting with oxygen concentration 23% can save energy 25%.
Specific embodiment
Emphasis of the present invention relates to the aspects such as structural parameter of oxygen enrichment supply mode, oxygen-enriched purity and feed rate in the combustion processes, oxygen enrichment structure of nozzle parameter and oxygen-enriched combusting port.
(1) configuration of fuel lance and oxygen-rich gas nozzle: the configuration of fuel lance and oxygen-rich gas nozzle should be a principle to satisfy the big flame heat transfer efficiency, considers that simultaneously oxygen enriched flame can not jeopardize the safety of big arch and melting furnaces wall body structure.In the melting furnaces, fuel combustion preferably is divided into three zones: flame top is the oxygen-starved area, can prevent that big arch is overheated; The middle part is the ordinary combustion district; The high-temperature zone is formed as far as possible at the bottom, to strengthen the fusing to admixtion.Form this ideal burning state, can adopt the collocation method shown in the Figure of description, oxygen-rich gas nozzle is installed in the appropriate location below spray gun, guarantees that with enough pressure the spouting velocity of oxygen rich gas can realize.
(2) determining of oxygen rich gas purity: theoretically, oxygen rich gas purity (content of oxygen in the oxygen rich gas) is high more, helps full combustion of fuel more, and energy-saving effect is good more, and temperature of combustion is high more.In fact, the relation of fractional energy savings and oxygen rich gas purity is non-linear, and when purity surpasses 30%, fractional energy savings amplification reduces; Temperature of combustion improves with the increase of purity, when purity less than 30% the time, temperature sharply rises, it is small after this to rise in value.Therefore, consider that from the cost and the unit consumption of preparation oxygen rich gas purity gets final product with about 30%.The melting furnaces of counter structure size should be considered the matching relationship of the oxygen rich gas purity and the length of flame and form;
(3) determining of oxygen rich gas feed rate: the feed rate of oxygen rich gas should mainly be considered its influence to combustion flame temperature and form.If the oxygen-rich gas nozzle design is proper, it is prerequisite that the relative feed rate of oxygen rich gas that oxygen-enriched combustion-supporting is fit to should be improved with combustioncharacteristics;
(4) determining of oxygen rich gas pressure: after having determined the oxygen enrichment feed rate, the pressure of oxygen rich gas is determined by oxygen enrichment nozzle arrangements parameter (nozzle diameter, spread angle etc.).Thereby this parameter is most important, and with reference to the early-stage Study data, during research and development design oxygen enrichment nozzle, oxygen enrichment pressure is in 0.1～0.3 MPa scope before considering to select nozzle;
(5) determining of the structural parameter of oxygen-enriched combusting port: should substitute the quantity of combustion air according to oxygen rich gas, suitably reduce the height of combustion air ejiction opening.
The enforcement of present technique fairly simple (Figure of description 2 is seen in technical process), do not change the float glass smelting kiln original structure, stove itself both had no side effect does not have unsafe factor yet, concerning the user, both alleviate labour intensity (having reduced the coking of oil/gas jets or coal), improved Working environment again.Oxygen-enriching device does not have consumable accessory in addition, need not clean and change, and only pump needs conventional maintenance, and device lifetime is more than 10 years.
Float glass smelting kiln of the present invention " local oxygen enriching " and " gradient burning " technology can be applicable to various float glass furnaces.Use the oxygen-rich air amount only to be 1%～15% of required air quantity, and original combustion-supporting air quantity have obvious decline.This technology has been applied tens of families at present, facts have proved: the glass melter stove adopts oxygen-enriched combustion technology, can be energy-conservation 5%～8%, increase output 5%～10%, combustiblematerials obviously reduces in the waste gas, and can prolong furnace life, reduce to pollute, improves the refining quality of glass.
Description of drawings: Fig. 1 is that spray gun is introduced the oxygen enrichment synoptic diagram.Fig. 2 is the oxygen-enriched combustion energy efficient technology for float glass melting furnaces artwork.
Claims (7)
1. glass melter oxygen-enriched combusting power-saving technology.It is characterized in that glass melter adopts " local oxygen enriching " and " gradient burning " technology, can be applicable to all kinds of glass furnaces of various fuel (heavy oil, Sweet natural gas and coal gas).
2. method according to claim 1 is characterized in that being applicable to the oxygen rich gas extractive technique of float glass nitrogen producing craft.Adopt special oxygen voltage stabilizing and pressurizing device; outfit technology is reasonable, is guaranteeing that nitrogen producing craft is stable, when nitrogen gas purity, pressure satisfy the requirement of float tin groove shielding gas; make the purity oxygen or the assorted gas of oxygen enrichment of capacity and pressure, concentration stabilize, be referred to as oxygen-rich air.
3. according to the described method of claim 1--2, it is characterized in that oxygen-rich air and the air that purified are in the efficient gas mixing tank behind the thorough mixing (three grades are mixed), send in the automatic commutator through voltage-regulating system, after entering the preheating of oxygen-rich air interchanger, import the oxygen enrichment nozzle by the hot metal flexible pipe.
4. according to the described method of claim 1--3, it is characterized in that the preheating of oxygen-rich air can be installed in the bottom of big arch, crown of burner, port back wall and side wall insulating brick, the heat that utilizes body of wall to shed carries out preheating to oxygen-rich air.
5. according to the described method of claim 3-4, it is characterized in that the oxygen-rich air nozzle of preheating is installed in the below of heavy oil spray gun, spray in the stove combustion-supporting with controllable oxygen enrichment flow velocity.
6. according to the described method of claim 3-5; it is characterized in that spraying into oxygen-rich air in the flame bottom; change flame characteristics; flame is divided into three different zones: the upper strata cold flame layer that can protect arch top, breastwork; the zone of flame and oxygen enrichment is more and reached lower floor's zone of flame of perfect combustion in the middle of the high radiation of incendiary almost completely; make it form the gradient burning, lower floor's flame combines with upper strata flame, increases total radiant heat.Simultaneously because the thermal-flame aspect of lower floor, has increased the convective exchange with admixtion to admixtion, thereby reach energy-conservation and quicken the purpose of fusing.
7. according to the described method of claim 1-6, after it is characterized in that float glass smelting kiln adopts oxygen-enriched combustion technology, can save energy 5%-8%, or increase output 5%-10%, combustiblematerials obviously reduces in the waste gas, and can prolong furnace life, reduce to pollute, improves the refining quality of glass.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880122A (en) * | 2010-03-16 | 2010-11-10 | 武汉长利玻璃有限责任公司 | Side burning device structure of float glass smelting kiln |
| CN103086585A (en) * | 2013-02-21 | 2013-05-08 | 成都光明光电股份有限公司 | Optical glass kiln oxygen-fuel combustion system and combustion method |
| WO2018032556A1 (en) * | 2016-08-19 | 2018-02-22 | 巨石集团有限公司 | Method for heating liquid glass channel of glass fiber tank furnace |
| CN107804958A (en) * | 2017-12-05 | 2018-03-16 | 山西德泓利科技有限责任公司 | A kind of High Efficiency Thermal radiant glass kiln |
| CN109052912A (en) * | 2018-10-10 | 2018-12-21 | 巨石集团有限公司 | A kind of high melting rate unit kiln burning structure |
| CN111780105A (en) * | 2020-06-30 | 2020-10-16 | 云南滇凯节能科技有限公司 | Natural gas spray gun energy-saving burner for producing high-light-heat-ratio glass |
| CN114538751A (en) * | 2020-11-25 | 2022-05-27 | 上海源晗能源技术有限公司 | Nitrogen-free gas glass kiln oxygen + CO2Circulating combustion method, system and device |
-
2006
- 2006-07-18 CN CNA2006100989387A patent/CN101108766A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880122A (en) * | 2010-03-16 | 2010-11-10 | 武汉长利玻璃有限责任公司 | Side burning device structure of float glass smelting kiln |
| CN103086585A (en) * | 2013-02-21 | 2013-05-08 | 成都光明光电股份有限公司 | Optical glass kiln oxygen-fuel combustion system and combustion method |
| CN103086585B (en) * | 2013-02-21 | 2015-02-11 | 成都光明光电股份有限公司 | Optical glass kiln oxygen-fuel combustion system and combustion method |
| WO2018032556A1 (en) * | 2016-08-19 | 2018-02-22 | 巨石集团有限公司 | Method for heating liquid glass channel of glass fiber tank furnace |
| CN107804958A (en) * | 2017-12-05 | 2018-03-16 | 山西德泓利科技有限责任公司 | A kind of High Efficiency Thermal radiant glass kiln |
| CN109052912A (en) * | 2018-10-10 | 2018-12-21 | 巨石集团有限公司 | A kind of high melting rate unit kiln burning structure |
| CN111780105A (en) * | 2020-06-30 | 2020-10-16 | 云南滇凯节能科技有限公司 | Natural gas spray gun energy-saving burner for producing high-light-heat-ratio glass |
| CN114538751A (en) * | 2020-11-25 | 2022-05-27 | 上海源晗能源技术有限公司 | Nitrogen-free gas glass kiln oxygen + CO2Circulating combustion method, system and device |
| CN114538751B (en) * | 2020-11-25 | 2023-12-19 | 上海源晗能源技术有限公司 | Nitrogen-free gas glass kiln oxygen+CO 2 Method, system and device for circulating combustion |
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Open date: 20080123 |