CN109751616B - Oxygenation combustion equipment and technology for reducing NOx emission of glass melting furnace - Google Patents
Oxygenation combustion equipment and technology for reducing NOx emission of glass melting furnace Download PDFInfo
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- CN109751616B CN109751616B CN201711068092.7A CN201711068092A CN109751616B CN 109751616 B CN109751616 B CN 109751616B CN 201711068092 A CN201711068092 A CN 201711068092A CN 109751616 B CN109751616 B CN 109751616B
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- 239000011521 glass Substances 0.000 title claims abstract description 104
- 238000002844 melting Methods 0.000 title claims abstract description 101
- 230000008018 melting Effects 0.000 title claims abstract description 101
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 96
- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 77
- 238000005516 engineering process Methods 0.000 title description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 164
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 164
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 162
- 239000000446 fuel Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 10
- 238000000265 homogenisation Methods 0.000 abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 238000004519 manufacturing process Methods 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 15
- 239000005329 float glass Substances 0.000 description 12
- 230000009467 reduction Effects 0.000 description 9
- 239000005357 flat glass Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 238000005352 clarification Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- DEPUMLCRMAUJIS-UHFFFAOYSA-N dicalcium;disodium;dioxido(oxo)silane Chemical compound [Na+].[Na+].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O DEPUMLCRMAUJIS-UHFFFAOYSA-N 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000005336 safety glass Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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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- Glass Melting And Manufacturing (AREA)
Abstract
The invention provides an oxygenation combustion device and a process for reducing NOx emission of a glass melting furnace, wherein a third oxygenation burner at a charging port of the glass melting furnace is introduced into a melting part of the glass melting furnace, so that the bottom temperature of flame at a combustion side is increased, fuel at the opposite side of flame combustion is burned out, the combustion air quantity in a small furnace is reduced, and NO is reduced x Generating concentration; the first oxygenation burner is introduced into the melting part of the glass melting furnace, so that the temperature of the hot spot position of the melting part is rapidly increased, the combustion-supporting air quantity of the small furnaces at two sides is reduced, and the NO in the high-temperature combustion process is reduced x Generating; the second oxygenation burner behind the end-to-end small furnace is introduced into the glass melting furnace, the homogenization parameters of the glass melting furnace are regulated, the combustion of oxygen and fuel is rapid and complete, and the flame space NO is prevented x Generating; the back gable is provided with a fourth oxygenation burner, the temperature of the clarifying part is regulated, and the pressure above the glass liquid of the clarifying part is regulated to be balanced with the outside.
Description
Technical Field
The invention relates to a method for reducing NO in a glass melting furnace x An oxygen-increasing combustion device and a process for discharging belong to the technical field of glass manufacturing.
Background
The flat glass is also called white glass or clean glass, the chemical components of the flat glass belong to sodium-calcium silicate glass, and the flat glass is generally used for doors and windows, showcases, mirror making and the like of civil buildings, shops, restaurants, office buildings, airports, stations and other buildings, and can also be used for processing and manufacturing safety glass such as toughened, interlayers and the like because the flat glass has the performances of light transmission, transparency, heat preservation, sound insulation, wear resistance, weather resistance and the like.
The oxygen content in the air is about 21%, the nitrogen content is about 78%, only oxygen participates in the combustion reaction in the combustion process, nitrogen does not participate in the combustion, a large amount of nitrogen absorbs heat released by the combustion reaction, and meanwhile, the nitrogen reacts with the oxygen at high temperature to generate a large amount of nitrogen oxides, and the nitrogen oxides are discharged into the atmosphere along with flue gas, so that energy is wasted, and the atmosphere is polluted.
The manufacture of plate glass belongs to the industry of high energy consumption, and more than 98% of the plate glass in China is a common float glass melting furnace taking air as combustion-supporting medium. In the high-temperature preparation process, N in combustion-supporting air 2 Is oxidized to form NO x The discharge concentration is up to 1800-3300 mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The float glass production process requires the use of Na 2 SO 4 As clarifying agent, under high temperature condition, SO is released by decomposition 2 The discharge concentration is up to 2000-6000 mg/Nm 3 . Taking 600t/d float glass production line as an example, the smoke amount is 80000Nm 3 Per hour, NO produced per day x At a rate of 2500 mg/Nm at 4.8 tons 3 Calculation of SO x At a rate of 3000mg/Nm for 5.8 tons 3 Calculated, the number of float glass production lines running at home at present is 240, and NO generated annually x 42 ten thousand tons of SO x 51 ten thousand tons, the domestic standard for discharging atmospheric pollutants in the flat glass industry GB26453-2011 requires a glass kiln NO x Discharge Standard 700mg/Nm 3 Hereinafter, SO x Emission standard 400mg/Nm 3 In the following, the current desulfurization and denitrification tail end treatment cost is high, and the enterprise burden is heavy.
Foreign glass manufacturing enterprises develop the full-oxygen combustion technology in the 90 s of the last century, and a float glass production line is transformed into a full-oxygen combustion kiln in many countries; moreover, several production lines of total oxygen combustion float glass are successively built in China, but the production cost of the glass manufactured by the total oxygen kiln is higher than that of a common float glass melting furnace, and meanwhile, the quality fluctuation of the glass produced by the production lines is large, and the cost of the produced glass is obviously higher than that of a common flat glass, so that the common loss of the total oxygen production line is caused.
Therefore, the method can not only reduce NO in the flue gas of the glass melting furnace x Methods and apparatus for process throughput, while still achieving energy efficient performance in glass melters, are highly desirable in the art.
Disclosure of Invention
The invention aims to solve the problems and provide a method for reducing NO in a glass melting furnace x Oxygen-increasing combustion equipment and process of discharging; the third oxygenation burner is introduced into the melting part of the glass melting furnace through the charging opening of the glass melting furnace, so that the temperature of the bottom of the flame at the combustion side is increased, the fuel at the opposite side of the flame combustion is burnt out, the combustion air quantity in the small furnace is reduced, nitrogen brought in by air is reduced, and NO x The generation concentration of the fuel is reduced, and the combustion efficiency is improved; in addition, the first oxygenation burner is introduced into the melting part of the glass melting furnace, so that the temperature of the hot spot position of the melting part is rapidly increased, the melting speed of glass is increased, the combustion-supporting air quantity of the two side small furnaces is reduced, and the NO in the high-temperature combustion process is reduced x Is generated; meanwhile, the second oxygenation burner at the tail end of the small furnace is introduced into the glass melting furnace, the homogenization parameters of the glass melting furnace are regulated, and the combustion of oxygen and fuel is rapid and complete, thus preventing NO in the flame space x The generation of the viscosity-temperature curve of the glass liquid can be adjusted according to the actual condition of the viscosity-temperature curve of the glass liquid; and the oxygen increasing burner at the back gable is introduced into the glass melting furnace, mainly for adjusting the temperature of the clarifying part, burning the fuel which is not completely burned in the clarifying part, preventing flame from tilting to other parts, burning the glass melting furnace, reducing the whole service life of the glass melting furnace, adjusting the balance between the pressure above the glass liquid of the clarifying part and the outside, and realizing the purposes of saving energy, reducing consumption and accelerating the clarification and homogenization of the glass liquid; in addition, the equipment has reasonable structure and stable process system, and is not only beneficial to realizing NO emission reduction x The content can also play a double role in energy conservation, saves the production cost, and is beneficial to popularization and application in the glass industry.
In order to achieve the above purpose, the invention is realized by the following technical means:
the invention provides a method for reducing NO in a glass melting furnace x The discharged oxygenation combustion equipment consists of a melting part, a small furnace, a first oxygenation combustor and a charging port, and is characterized in that: the front end of the glass kiln is provided with a feed inlet, the rear end of the feed inlet is provided with a melting part, the two ends of the feed inlet are provided with third oxygenation burners, the third oxygenation burners and the fourth oxygenation burners are positioned above the glass liquid level, the two sides of the glass kiln are respectively provided with a first oxygenation burner, a second oxygenation burner and a plurality of pairs of small furnaces, the rear end of the glass kiln is provided with a rear gable wall, and the middle part of each small furnace is provided with the first oxygenation burner.
The rear side of the last pair of small furnaces is provided with a second oxygenation burner, the rear gable wall is provided with a fourth oxygenation burner, and the front ends of the first oxygenation burner, the second oxygenation burner and the third oxygenation burner are provided with spray guns.
The first oxygenation burner, the second oxygenation burner, the third oxygenation burner and the fourth oxygenation burner are respectively connected with the oxygen control valve group through pipelines.
The total flow of oxygen of the oxygen control valve group is as follows: 1200-1800Nm 3 /h; oxygen temperature: 5-20 ℃; oxygen pressure: 0.01-0.15MPa; oxygen purity: 91-95%; branch line oxygen flow: 50-300Nm 3 /h; oxygen pressure at the nozzle front of the combustion lance: 0.01-0.075MPa.
The main parameters of the oxygen outlet of the back gable are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.03-0.06MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 100-200Nm 3 /h。
The main parameters of the oxygen at the charging port are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.04-0.075MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 150-300Nm 3 /h。
The main parameters of the oxygen at the hot spot in the middle of the melting part are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.02-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 60-260Nm 3 /h。
The main parameters of the oxygen after the last pair of small furnacesThe oxygen temperature is: 5-20 ℃; pressure of oxygen ejection port: 0.01-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 50-190Nm 3 /h。
Reducing NO in glass melting furnace by using the equipment x An oxygen-increasing combustion process of the emission: gradient oxygen-increasing combustion of glass melting furnace is utilized to realize gradient combustion of different positions for flame space in the combustion process, and different gradient combustion is realized for upper, middle and lower layers of the flame space in the combustion process, wherein the upper layer is not completely combusted, the temperature is reduced and NO is reduced x The discharge amount is neutral combustion in the middle part, so that the flame has a certain temperature gradient, the lower layer is completely combusted in the oxidizing atmosphere, the combustion temperature of oxygen and fuel is high, the heat radiation to molten glass is increased, the temperature of the upper space of a melting part is reduced, and the burning loss of the flame to the crown of the glass melting furnace is reduced; collecting and conveying oxygen of the nitrogen-hydrogen station to an oxygen control valve group, controlling and adjusting according to performance requirements of different small furnace positions, and adjusting parameters of a combustion spray gun to realize NO x And emission reduction in the process.
Working principle: the forming section of the float glass melting furnace needs to adopt nitrogen and hydrogen as protective gases to prevent metallic tin in a tin bath from being oxidized, and the general nitrogen is prepared by adopting a cryogenic air separation method, namely, after air is compressed, the nitrogen and oxygen in the air are separated by reducing the temperature, so that on the basis of preparing nitrogen, the oxygen with the purity of more than 90 percent can be prepared at the same time by 500-1200 cubic meters per hour, and the oxygen is introduced into the glass melting furnace to carry out partial oxygen combustion supporting, thus realizing NO x Reducing the emission and saving energy of the glass melting furnace.
The oxygen-increasing combustion process is characterized in that different gradient combustion is realized on the upper, middle and lower layers of a flame space in the combustion process, staged combustion is realized by adjusting the purity, temperature, pressure and flow of oxygen and the shape and angle of an oxygen outlet, and the transverse flame premixing area O of the glass melting furnace is controlled 2 、N 2 Concentration distribution, combustion zone temperature distribution and CO concentration distribution at flame end, NO of glass melting furnace is realized x The generation amount is controlled, the generation concentration of a NOx source is reduced, and the post-treatment is reducedDenitration load in the process.
The oxygen-enriched combustion process results in a combustion reaction which is in the first stage of incomplete combustion of rich fuel, due to the lower flame temperature and O 2 、N 2 Less amount of NO x Is generated; the second stage is to take O as 2 The combustion-supporting mainly complete combustion reaction has high flame temperature, but lacks N 2 Takes part in and burns for a short time, NO x The amount of the produced product is small. The oxygenation combustion process ensures that the fuel is completely combusted, the temperature of the bottom of the flame is increased, the heat transfer capability of the flame to batch or glass liquid is increased, the temperature of the upper part of the flame close to the crown is reduced, the heat dissipation of the crown outwards is reduced, the heat loss is reduced, and the melting rate of the melting furnace is increased at the same time, so that the energy saving of the glass melting furnace is realized.
The existing air separation system equipment oxygen collecting and conveying system of a float glass production enterprise is modified by the requirements of oxygen collection, purification, boosting, control of each branch and the like of the oxygen generated by the nitrogen-hydrogen station through the oxygen collection and adjustment control valve group, oxygen needs to be collected, purified and boosted, and the temperature, pressure and flow of the oxygen are regulated through the control valve group, so that the oxygen parameters of each spray gun of each pair of small furnaces fed into the kiln are accurately controlled. Pipeline transportation from the oxygen valve group to the position in front of the kiln gun, gun front check control and the like. Through the filtering, decompression, safety cutting and diffusing control of oxygen, the pipeline system also needs to process the requirements for oxygen transportation, and adjusts the oxygen flow and pressure of different positions according to the requirements of different positions on the performance parameters of the melting furnace, thereby realizing energy saving and emission reduction equipment in the glass combustion process.
At the same time, increase 1500Nm 3 Under the oxygen condition of/h, the combustion-supporting air quantity 7500Nm can be reduced 3 Above/h, the upper space of the melting furnace can be lowered by 20-50 ℃ and NO x The emission reduction amount is more than 40 percent.
The invention has the following advantages:
1. the third oxygenation burner at the charging port of the glass melting furnace is introduced into the melting part of the glass melting furnace, so that the temperature of the bottom of the flame at the combustion side is increased, the fuel at the opposite side of the flame combustion is burned out, and the temperature of the fuel at the opposite side of the flame combustion is reducedThe amount of combustion-supporting air in the small furnace, the nitrogen carried in the air is reduced, and NO x The concentration of the produced fuel is reduced and the combustion efficiency is improved.
2. The first oxygenation burner is introduced into the melting part of the glass melting furnace, so that the temperature of the hot spot position of the melting part is rapidly increased, the melting speed of glass is increased, the combustion-supporting air quantity of the small furnaces at two sides is reduced, and the NO in the high-temperature combustion process is reduced x Is generated.
3. The second oxygenation burner is introduced into the glass melting furnace after the end pair small furnace, the homogenization parameters of the glass melting furnace are regulated, the combustion of oxygen and fuel is rapid and complete, and NO in the flame space is prevented x And can be adjusted according to the actual conditions of the viscosity-temperature curve of the molten glass.
4. The oxygen increasing burner at the back gable is introduced into the glass melting furnace, mainly adjusts the temperature of the clarifying part, burns the fuel which is not completely combusted at the clarifying part, prevents flame from tilting to other parts and burning the glass melting furnace, thereby reducing the whole service life of the glass melting furnace, adjusting the balance between the pressure above the glass liquid of the clarifying part and the outside, and realizing the purposes of saving energy, reducing consumption and accelerating the clarification and homogenization of the glass liquid.
5. The equipment has reasonable structure and stable process system, is beneficial to realizing emission reduction of harmful gas, has the double functions of energy conservation, saves the production cost, and is beneficial to popularization and application in industry.
Drawings
FIG. 1 shows a glass melting furnace NO reduction according to the invention x The structural schematic diagram of the discharged oxygenation combustion equipment and the glass kiln of the process.
Description of main reference numerals:
1 melting section
2-small furnace
3 first oxygenation burner
4 second oxygenation burner
5 charging hole
6 third oxygenation burner
7 fourth oxygenation combustor
8 rear gable
The invention is described in further detail below with reference to examples and the accompanying drawings:
Detailed Description
NO of glass melting furnace is reduced x The discharged oxygenation combustion equipment consists of a melting part 1, a small furnace 2, a first oxygenation combustor 3 and a charging port 5.
As shown in fig. 1, a charging port 5 is arranged at the front end of a glass kiln, a melting part 1 is arranged at the rear end of the charging port 5, third oxygenation burners 6 are arranged at the two ends of the charging port 5, the third oxygenation burners 6 and fourth oxygenation burners 7 are positioned above the glass liquid level, a first oxygenation burner 3, a second oxygenation burner 4 and a plurality of pairs of small furnaces 2 are respectively arranged at the two sides of the glass kiln, a rear gable 8 is arranged at the rear end of the glass kiln, and the first oxygenation burner 3 is arranged in the middle of the small furnaces 2.
The rear side of the last pair of small furnaces 2 is provided with a second oxygenation burner 4, a rear gable 8 is provided with a fourth oxygenation burner 7, and the front ends of the first oxygenation burner 3, the second oxygenation burner 4 and the third oxygenation burner 6 are provided with spray guns.
The first oxygenation burner 3, the second oxygenation burner 4, the third oxygenation burner 6 and the fourth oxygenation burner 7 are respectively connected with an oxygen control valve group through pipelines.
The total flow of oxygen of the oxygen control valve group is as follows: 1200-1800Nm 3 /h; oxygen temperature: 5-20 ℃; oxygen pressure: 0.01-0.15MPa; oxygen purity: 91-95%; branch line oxygen flow: 50-300Nm 3 /h; oxygen pressure at the nozzle front of the combustion lance: 0.01-0.075MPa.
The main parameters of the oxygen discharged from the back gable 8 are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.03-0.06MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 100-200Nm 3 /h。
The main parameters of the oxygen at the charging port 5 are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.04-0.075MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 150-300Nm 3 /h。
The melting part 1The main parameters of oxygen at the middle hot spot are oxygen temperature: 5-20 ℃; pressure of oxygen ejection port: 0.02-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 60-260Nm 3 /h。
The main parameters of the oxygen after the last pair of small furnaces 2 are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.01-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 50-190Nm 3 /h。
NO of glass melting furnace is reduced x The discharged oxygenation combustion process is characterized in that: gradient oxygen-increasing combustion of glass melting furnace is utilized to realize gradient combustion of different positions for flame space in the combustion process, and different gradient combustion is realized for upper, middle and lower layers of the flame space in the combustion process, wherein the upper layer is not completely combusted, the temperature is reduced and NO is reduced x The discharge amount is neutral combustion in the middle part, so that the flame has a certain temperature gradient, the lower layer is completely combusted in the oxidizing atmosphere, the combustion temperature of oxygen and fuel is high, the heat radiation to molten glass is increased, the temperature of the upper space of the melting part 1 is reduced, and the burning loss of the flame to the crown of the glass melting furnace is reduced; collecting and conveying oxygen of the nitrogen-hydrogen station to an oxygen control valve group, controlling and adjusting according to performance requirements of different small furnace 2 positions, and adjusting parameters of a combustion spray gun to realize NO x And emission reduction in the process.
The forming section of the float glass melting furnace needs to adopt nitrogen and hydrogen as protective gases to prevent metallic tin in a tin bath from being oxidized, and the general nitrogen is prepared by adopting a cryogenic air separation method, namely, after air is compressed, nitrogen and oxygen in the air are separated by reducing the temperature, so that on the basis of preparing nitrogen, oxygen with the purity of more than 90 percent can be prepared at the same time by 500-1200 cubic meters per hour, and the oxygen is introduced into the glass melting furnace to carry out partial oxygen combustion supporting, thus realizing NO x Reducing the emission and saving energy of the glass melting furnace.
The oxygen-increasing combustion process is characterized by implementing different gradient combustion on upper, middle and lower layers of flame space in the combustion process, and regulating purity, temperature, pressure and flow of oxygen and shape and angle of oxygen outletRealize staged combustion and control the transverse flame premixing zone O of the glass melting furnace 2 、N 2 Concentration distribution, combustion zone temperature distribution and CO concentration distribution at flame end, NO of glass melting furnace is realized x The generation amount is controlled, the generation concentration of the NOx source is reduced, and the denitration load in the post-treatment process is reduced.
The oxygen-enriched combustion process results in a combustion reaction which is in the first stage of incomplete combustion of rich fuel, due to the lower flame temperature and O 2 、N 2 Less amount of NO x Is generated; the second stage is to take O as 2 The combustion-supporting mainly complete combustion reaction has high flame temperature, but lacks N 2 Takes part in and burns for a short time, NO x The amount of the produced product is small. The oxygenation combustion process ensures that the fuel is completely combusted, the temperature of the bottom of the flame is increased, the heat transfer capability of the flame to batch or glass liquid is increased, the temperature of the upper part of the flame close to the crown is reduced, the heat dissipation of the crown outwards is reduced, the heat loss is reduced, and the melting rate of the melting furnace is increased at the same time, so that the energy saving of the glass melting furnace is realized.
The existing air separation system equipment oxygen collecting and conveying system of a float glass production enterprise is modified by the requirements of oxygen collection, purification, boosting, control of each branch and the like of the oxygen generated by the nitrogen-hydrogen station through the oxygen collection and adjustment control valve group, oxygen needs to be collected, purified and boosted, and the temperature, pressure and flow of the oxygen are regulated through the control valve group, so that the oxygen parameters of each spray gun of each pair of small furnaces 2 of a kiln are accurately controlled. Pipeline transportation from the oxygen valve group to the position in front of the kiln gun, gun front check control and the like. Through the filtering, decompression, safety cutting and diffusing control of oxygen, the pipeline system also needs to process the requirements for oxygen transportation, and adjusts the oxygen flow and pressure of different positions according to the requirements of different positions on the performance parameters of the melting furnace, thereby realizing energy saving and emission reduction equipment in the glass combustion process.
Oxygen generated by the nitrogen-hydrogen station is fully utilized, oxygen-increasing gradient combustion transformation is adopted for the glass melting furnace, the oxygen is conveyed to different combustion parts of the glass melting furnace through a pipeline valve group system, and the temperature, the pressure and the flow of the oxygen are controlled through adopting the valve group system, so that different energy-saving and emission-reducing effects are generated.
The oxygen is mainly introduced into three parts of the glass kiln, namely: the charging hole 5 is positioned at the hot spot, the rear part of the last pair of small furnaces 2 and the rear gable 8.
The following describes the four positions respectively:
main parameters of oxygen fed into the position of the feed inlet 5: oxygen temperature: 5-20 ℃; pressure of oxygen ejection port: 0.04-0.075MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 150-300Nm 3 /h; the oxygen is introduced into the melting part 1 of the glass melting furnace through the third oxygenation burner 6 at the position of the charging port 5 of the glass melting furnace, the main function is to raise the temperature of the bottom of the flame at the combustion side and burn off the fuel at the combustion side of the flame, thus the combustion-supporting air quantity in the small furnace 2 of the glass melting furnace is reduced, the nitrogen introduced into the air is reduced, and NO x The concentration of the produced gas is reduced, and the gas is not required to enter the small furnace 2 for combustion, so that the combustion efficiency is improved, and the energy saving is realized.
Major parameters of oxygen at hot spots: oxygen temperature: 5-20 ℃; pressure of oxygen ejection port: 0.02-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 60-260Nm 3 /h; the oxygen is introduced into the melting part 1 of the glass melting furnace through the first oxygenation burner 3 at the hot spot, and the main function is to quickly raise the temperature of the hot spot of the melting part 1 of the glass melting furnace, because the combustion-supporting effect of the oxygen is more obvious than that of the air, the clarification and foam discharging process of the glass melting furnace is accelerated, the melting speed of the glass is raised, the combustion-supporting air quantity of the small furnaces 2 at two sides is reduced, and the NO in the high-temperature combustion process is reduced x Is generated.
Main parameters of oxygen after final treatment of the small furnace 2: oxygen temperature: 5-20 ℃; pressure of oxygen ejection port: 0.01-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 50-190Nm 3 /h; the oxygen is introduced into the glass melting furnace through the second oxygenation burner 4 after the end-to-end furnace 2, and the main function is to adjust the homogenization parameters of the glass melting furnace, and the oxygen is generally addedThe fuel for the small furnace 2 is less than that for the previous small furnace 2, which is to realize the rapid and complete combustion of oxygen and fuel after adopting the oxygenation combustion-supporting technology, thereby preventing a large amount of NO generated in the flame space due to the combustion of air and fuel x And can be adjusted according to the actual condition of the viscosity-temperature curve of the molten glass, thereby being beneficial to realizing the dual functions of emission reduction and energy saving. The application of the oxygenation combustion equipment and the technology can not influence various parameters of the float glass melting furnace, and is beneficial to the popularization and the application of the technology.
The main parameters of oxygen at the back gable 8 are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.03-0.06MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 100-200Nm 3 And/h. The oxygen is introduced into the glass melting furnace through the fourth oxygenation burner 7 at the back gable 8, mainly the temperature of the clarifying part is regulated, the fuel which is not completely combusted is combusted at the clarifying part, the flame is prevented from tilting to other parts, the glass melting furnace is burnt, the whole service life of the glass melting furnace is reduced, the balance between the pressure above the glass liquid of the clarifying part and the outside is regulated, and the purposes of saving energy, reducing consumption and accelerating the clarification and homogenization of the glass liquid are realized.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (1)
1. An oxygenation combustion process for reducing NOx emission of a glass melting furnace is characterized by comprising the following steps of: gradient oxygen-increasing combustion of glass melting furnace is utilized to realize gradient combustion of different positions for flame space in the combustion process, and different gradient combustion is realized for upper, middle and lower layers of the flame space in the combustion process, wherein the upper layer is not completely combusted, the temperature is reduced and NO is reduced x The discharge amount is neutral combustion in the middle part, so that the flame has a certain temperature gradient, the lower layer is completely combusted in the oxidizing atmosphere, the combustion temperature of oxygen and fuel is high, the heat radiation to glass liquid is increased, and the melting part (1)) The temperature of the upper space reduces the burning loss of flame to the main crown of the glass melting furnace; collecting and conveying oxygen of the nitrogen-hydrogen station to an oxygen control valve group, controlling and adjusting according to performance requirements of different small furnace (2) positions, and realizing NO by adjusting parameters of a combustion spray gun x Reducing emission in the process;
the front end of the glass kiln is provided with a feed inlet (5), the rear end of the feed inlet (5) is provided with a melting part (1), two sides of the glass kiln are respectively provided with a first oxygenation burner (3), a second oxygenation burner (4) and a plurality of pairs of small furnaces (2), the rear end of the glass kiln is provided with a rear gable (8), the middle part of each small furnace (2) is provided with the first oxygenation burner (3), the rear side of each small furnace (2) is not provided with the second oxygenation burner (4), the two ends of the feed inlet (5) are provided with a third oxygenation burner (6), the rear gable (8) is provided with a fourth oxygenation burner (7), the front ends of the first oxygenation burner (3), the second oxygenation burner (4) and the third oxygenation burner (6) are provided with spray guns, the third oxygenation burner (6) and the fourth oxygenation burner (7) are positioned above the glass liquid level, and the first oxygenation burner (3), the second oxygenation burner (4), the third oxygenation burner (6) and the fourth oxygenation burner (7) are respectively connected with an oxygen control valve group through pipelines;
total flow of oxygen in the oxygen control valve group: 1200-1800Nm 3 /h; oxygen temperature: 5-20 ℃; oxygen pressure: 0.01-0.15MPa; oxygen purity: 91-95%; branch line oxygen flow: 50-300Nm 3 /h; oxygen pressure at the nozzle front of the combustion lance: 0.01-0.075MPa;
the main parameters of the oxygen discharged from the back gable (8) are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.03-0.06MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 100-200Nm 3 /h；
The main parameters of oxygen at the feed inlet (5) are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.04-0.075MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 150-300Nm 3 /h；
The main parameters of oxygen at the hot spot in the middle of the melting part (1) are,oxygen temperature: 5-20 ℃; pressure of oxygen ejection port: 0.02-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 60-260Nm 3 /h；
The main parameters of the oxygen after the position of the final pair of small furnaces (2) are as follows: 5-20 ℃; pressure of oxygen ejection port: 0.01-0.03MPa; oxygen purity: 91-95%; two branch pipe system oxygen flows: 50-190Nm 3 /h。
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| CN113429116B (en) * | 2021-06-11 | 2023-02-03 | 秦皇岛玻璃工业研究设计院有限公司 | Gradient oxygen-increasing low-NOx combustion device and process for float glass melting furnace |
| CN113429114B (en) * | 2021-08-02 | 2022-09-27 | 上海源晗能源技术有限公司 | Glass kiln combustion process with non-catalytic converter |
| CN116143380A (en) * | 2022-12-08 | 2023-05-23 | 宜昌南玻光电玻璃有限公司 | Efficient combustion system and control method for ultrathin float glass melting furnace |
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