CN215102818U - Nitrogen-free gas glass kiln oxygen + CO2Circulating combustion system and device - Google Patents
Nitrogen-free gas glass kiln oxygen + CO2Circulating combustion system and device Download PDFInfo
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- CN215102818U CN215102818U CN202022770649.5U CN202022770649U CN215102818U CN 215102818 U CN215102818 U CN 215102818U CN 202022770649 U CN202022770649 U CN 202022770649U CN 215102818 U CN215102818 U CN 215102818U
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Abstract
The utility model relates to a nitrogen-free gas glass kiln oxygen + CO2A circulating combustion system. Adopts oxygen and CO in the circulating flue gas of the glass kiln2Prepared into oxygen enrichment as a combustion improver for oxygen enrichment combustion of a glass kiln, wherein the nitrogen-free fuel gas is oxygen plus CO in the glass kiln2The circulating combustion system has: the oxygen preparation device is used for preparing oxygen as an oxygen source; circulating flue gas CO2A recovery device for recovering CO in the tail gas of the glass kiln2As the distribution of oxygen-enriched air; oxygen-enriched mixing device, oxygen prepared by oxygen preparation device and circulating flue gas CO2CO recovered by recovery device2The oxygen-enriched gas is conveyed to an oxygen-enriched mixing device according to a required proportion and is mixed in the oxygen-enriched mixing device to form oxygen-enriched gas serving as a combustion improver of the glass kiln; a raw material feeding device for supplying raw materials used by the glass kiln to the glass kiln; a glass kiln to which the oxygen-enriched gas formed by the oxygen-enriched mixing device is supplied.
Description
Technical Field
The utility model relates to a nitrogen-free combustion technology, the main content is oxygen and CO used in a glass kiln2The combustion-supporting glass kiln replaces air to support combustion, and belongs to the technical field of glass kiln combustion; adopts oxygen and CO in the circulating flue gas of the glass kiln2Prepared into oxygen enrichment to be used as a combustion improver and used for the oxygen enrichment combustion of a kiln.
Background
The glass industry is an energy-consuming household, at present, thousands of glass kilns exist in China, the heat efficiency and the heat energy utilization rate are low, the unit consumption of products is large, the cost is high, the pollution is large, and along with the unbalance of global energy supply and the aggravation of regional crisis, the fuel price continuously rises, and the glass production cost is higher and higher. Therefore, the research on energy conservation and emission reduction of the glass melting furnace is a subject with great strategic significance. The fuel cost accounts for about 40% of the glass production cost, and the economic benefit of the industry is seriously influenced. Therefore, the glass industry has a very urgent need for energy saving technology.
In the prior art, the glass melting furnace always takes air as a combustion-supporting medium. Through the analysis and research on the existing combustion system, the adoption of air for combustion supporting is considered to be an important factor causing high energy consumption, high pollution and high greenhouse effect. Only 21% of oxygen in the air participates in combustion supporting, 78% of nitrogen does not participate in combustion, a large amount of nitrogen is uselessly heated and is discharged into the atmosphere at high temperature to cause large heat loss, the nitrogen also reacts with the oxygen at high temperature to generate NOx, the NOx is discharged into the atmosphere to easily form acid rain to cause environmental pollution, and a large amount of heat is also discharged into the atmosphere.
Along with the unbalance of global energy supply and the aggravation of ground-based crisis, the fuel price is continuously increased, the cost of glass production is higher and higher, and meanwhile, the requirements on energy conservation and emission reduction of production enterprises are higher and higher. The glass melting furnace always uses air as a combustion-supporting medium, and through analysis and research on the existing combustion system, the adoption of air for combustion supporting is considered to be an important factor causing high energy consumption, high pollution and high greenhouse effect. Only 21% of oxygen in the air participates in combustion supporting, 78% of nitrogen does not participate in combustion, a large amount of nitrogen is uselessly heated and is discharged into the atmosphere at high temperature to cause large heat loss, the nitrogen also reacts with the oxygen at high temperature to generate NOx, the NOx is discharged into the atmosphere to easily form acid rain to cause environmental pollution, and a large amount of heat is also discharged into the atmosphere. Therefore, the energy-saving and emission-reducing effect of the glass kiln is urgently achieved by adopting the glass kiln.
In addition, the average unit energy consumption of the float glass at home is 7800kJ/kg of glass liquid, the average unit energy consumption of the float glass at home is 5300-7250 kJ/kg of glass liquid, and the difference between the average unit energy consumption of the float glass and the average unit energy consumption of the float glass at home and the average unit energy consumption of the float glass is not more than 6500kJ/kg of glass liquid in the world is larger than that of the float glass in unit energy consumption limit of newly-built flat glass production enterprises.
At present, the content of nitrogen oxides in hot flue gas of domestic float glass is 1500-3000 mg/Nm3International 1200mg/Nm3And the pressure on the standard-reaching discharge of glass enterprises is huge. Improvements to gas combustion have been slow.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a nitrogen-free gas glass kiln oxygen + CO2The circulating combustion system adopts oxygen and CO in the circulating flue gas of the glass kiln2Prepared into oxygen-enriched air as combustion improver for oxygen-enriched combustion of glass kiln, and the nitrogen-free air isOxygen + CO of gas glass kiln2The circulating combustion system has: the oxygen preparation device is used for preparing oxygen as an oxygen source; circulating flue gas CO2A recovery device for recovering CO in the tail gas of the glass kiln2As the distribution of oxygen-enriched air; oxygen-enriched mixing device, oxygen prepared by oxygen preparation device and circulating flue gas CO2CO recovered by recovery device2The oxygen-enriched gas is conveyed to an oxygen-enriched mixing device according to a required proportion and is mixed in the oxygen-enriched mixing device to form oxygen-enriched gas serving as a combustion improver of the glass kiln; a raw material feeding device for supplying raw materials used by the glass kiln to the glass kiln; the oxygen-enriched gas formed by the oxygen-enriched mixing device is provided to the glass kiln, and the oxygen-enriched gas is used as a combustion improver to perform combustion reaction with nitrogen-free fuel in the glass kiln so as to release heat required by the operation of the glass kiln.
The nitrogen-free gas glass kiln oxygen + CO2The circulating combustion system can also be used for conveying the oxygen prepared by the oxygen preparation device to the oxygen-enriched mixing device at the pressure of 0.05-0.2 MPa.
Nitrogen-free gas glass kiln oxygen + CO as described in the new aspect of the invention2The oxygen produced by the oxygen production device is oxygen with a purity of more than 90 v%.
The nitrogen-free gas glass kiln oxygen + CO according to the certain aspect of the practical novel technology2The circulating combustion system can also be used for distributing the gas to be part of the purified circulating flue gas of the glass kiln.
The nitrogen-free gas glass kiln oxygen + CO according to the certain aspect of the practical novel technology2A circulating combustion system, optionally, said CO2The glass kiln flue gas is obtained after waste heat recovery, dust removal and desulfurization.
The nitrogen-free gas glass kiln oxygen + CO according to the certain aspect of the practical novel technology2The circulating combustion system may be configured such that the oxygen-enriched gas formed in the oxygen-enriched mixing device has an oxygen-enriched concentration of 23 to 35 v%.
Nitrogen-free as described in certain aspects of the inventionOxygen + CO of gas glass kiln2The circulating combustion system can also be used for utilizing CO in circulating flue gas by the raw material feeding device2The raw material feeding device is isolated, and the generation of raw material type nitrogen oxides is avoided.
The nitrogen-free gas glass kiln oxygen + CO according to the certain aspect of the practical novel technology2A circulating combustion system, and optionally, the circulating flue gas CO2CO collected by the recovery unit2Before feeding into the oxygen-enriched mixing device, the collected CO is subjected to pressure regulation by a pressure regulation device2The pressure adjustment is carried out so that the gas pressure is suitably transmitted in the apparatus.
The nitrogen-free gas glass kiln oxygen + CO according to the certain aspect of the practical novel technology2The circulating combustion system can also be used for utilizing CO in circulating flue gas in the glass kiln2The parts of the glass kiln which are easy to leak air are isolated by air seals, air curtains and other modes, so that the generation of thermal nitrogen oxides is avoided.
[ effects of utility model ]
According to the characteristics of gas radiation, only three-atom and multi-atom gases have radiation capability, and diatoms almost have no radiation capability; the higher the proportion of nitrogen without radiation capacity is, the smaller the blackness of furnace gas is, and the radiation force of the furnace gas on molten glass is influenced; by using CO in circulating flue gas2After the gas replaces nitrogen in combustion air, simultaneously, water vapor and CO are generated due to oxygen-enriched combustion2The furnace gas blackness and the radiation strength to batch and molten glass are greatly improved after synergistic effects are superposed, the melting rate is improved by more than 10%, the melting quality is correspondingly improved, and the remarkable effects of saving energy and reducing consumption are achieved.
The optimization of the combustion environment ensures that the temperature distribution in the furnace is more reasonable, and the service lives of the kiln and the boiler are effectively prolonged. The improvement of the combustion condition in the glass industry also shortens the temperature rise time of the kiln, improves the yield, reduces the defective rate and improves the yield; meanwhile, the requirement on the quality of the fuel is reduced, and the use of the poor-quality fuel is possible. The low-quality fuel has low price and is easy to purchase, and the energy cost of the product is reduced integrally.
The oxygen-enriched combustion technology can increase flame blackness, accelerate combustion speed, increase flame temperature, fully burn unburnt substances carried in smoke and reduce smoke discharge blackness. The combustible harmful gas generated by the combustion decomposition and the formation can be fully combusted, and the generation of the harmful gas can be reduced. The exhaust gas temperature and the exhaust gas amount are obviously reduced, and the thermal pollution and the dust emission are reduced. The utility model discloses change terminal to administer for the source and administer, realize the fundamental breakthrough of nitrogen oxide minimum emission.
The oxygen-enriched combustion technology has excellent performances in the aspects of increasing production, saving energy and reducing emission, can reduce the unit consumption of heat consumption and comprehensive energy consumption, improve the yield, reduce the emission of flue gas and realize the ultralow emission of NOx.
To sum up, the utility model discloses following beneficial effect has:
1. high temperature zone of kiln combustion from CO2Replaces nitrogen, and avoids the generation of nitrogen oxide.
The combustion mechanism of air combustion supporting in the conventional technology is as follows: CmHn + O2+N2→CO2+H2O+NOx。
The utility model can enrich oxygen (CO)2+O2) Combustion mechanism of combustion supporting: CmHn + O2+CO2→CO2+H2O。
2. According to the characteristics of gas radiation, only three-atom and multi-atom gases have radiation capability, and diatoms almost have no radiation capability; the higher the proportion of nitrogen without radiation capacity is, the smaller the blackness of furnace gas is, and the radiation force of the furnace gas on molten glass is influenced; by using CO2After the gas replaces nitrogen, simultaneously, the oxygen-enriched combustion causes water vapor and CO2The furnace gas blackness and the radiation strength to batch and molten glass are greatly improved after synergistic effects are superposed, the melting rate is improved by more than 10%, the melting quality is correspondingly improved, and the remarkable effects of saving energy and reducing consumption are achieved;
3. the optimization of the combustion environment ensures that the temperature distribution in the furnace is more reasonable, and the service lives of the kiln and the boiler are effectively prolonged. The improvement of the combustion condition in the glass industry also shortens the temperature rise time of the kiln, improves the yield, reduces the defective rate and improves the yield; meanwhile, the requirement on the quality of the fuel is reduced, and the use of the poor-quality fuel is possible. The low-quality fuel has low price and is easy to purchase, so that the energy cost of the product is reduced integrally;
4. the oxygen-enriched combustion technology can increase flame blackness, accelerate combustion speed, increase flame temperature, fully burn unburnt substances carried in smoke and reduce smoke discharge blackness. The combustible harmful gas generated by the combustion decomposition and the formation can be fully combusted, and the generation of the harmful gas can be reduced. The smoke exhaust temperature and the smoke exhaust amount are obviously reduced, and the thermal pollution and the dust emission are reduced;
5. the oxygen-enriched combustion technology has excellent performance in the aspects of increasing production, saving energy and reducing emission, can reduce the unit consumption of heat consumption and comprehensive energy consumption, improve the yield, reduce the emission of flue gas and realize the ultralow emission of NOx;
6. the oxygen-enriched combustion technology is implemented without changing the structure of the kiln body, and only partial optimization and modification are carried out on the raw material feeding system, the combustion-supporting system and the circulating flue gas system.
Drawings
FIG. 1 is a nitrogen-free gas glass kiln oxygen + CO2A block diagram of a cyclic combustion system.
Description of reference numerals:
the system comprises an oxygen preparation device 1, a 2-cycle flue gas CO2 recovery device, a 3-frequency variable blower, a 4-oxygen-rich mixer, a 5-oxygen-rich conveying pipeline, a 6-raw material feeding optimization system, a 7-glass kiln, an 8-flue gas purification system and a 9-chimney.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
With the deepening of the research on the energy-saving and consumption-reducing technology of the glass melting furnace, the research on energy-saving means of the glass melting furnace, such as developing an energy-saving glass formula, optimizing the structure of the glass melting furnace, improving the control technology of the glass melting furnace, strengthening the heat preservation and waste heat utilization of the glass melting furnace, and the like, is quite mature. Under the background, the oxygen-enriched combustion technology is developed to realize further energy conservation and consumption reduction of the melting furnace. In particular, in recent years, the oxygen-enriched combustion technology has been developed rapidly, and becomes one of the most active research subjects in the glass industry today.
Oxycombustion means that the oxygen concentration in the oxidizer for combustion promotion is higher than the oxygen concentration in air (the limit of which is pure oxygen). The oxygen concentration of the air can be concentrated from 20.9 percent to 26 to 30 percent, and simultaneously the residual nitrogen is gradually replaced by carbon dioxide in the tail gas of the flue gas, and the concentrated oxygen air is very suitable and safe for the combustion supporting of various kilns. The oxygen-enriched combustion technology can increase flame blackness, accelerate combustion speed and increase flame temperature, improves radiation heat transfer and convection heat transfer of flame to batch or molten glass because carbon dioxide replaces nitrogen, has high combustion efficiency, and greatly reduces NOXAnd (4) discharging. Meanwhile, the amount of flue gas can be reduced, so that the heat loss of the flue gas is reduced, and good energy-saving and environment-friendly effects are achieved.
The following oxygen and CO are added into the nitrogen-free gas glass kiln adopting the oxygen-enriched combustion technology2A cyclic combustion system is described. Referring to FIG. 1, oxygen + CO is added to a nitrogen-free gas glass kiln2The structure of the circulating combustion system will be explained. FIG. 1 is a nitrogen-free gas glass kiln oxygen + CO2A block diagram of a cyclic combustion system.
Fig. 1 shows an oxygen production apparatus 1, and specific examples of the oxygen production apparatus that is well-established and commonly used include a cryogenic process, a pressure swing adsorption process, a membrane separation process, and the like.
1. A deep cooling method: the cryogenic process is also called cryogenic rectification process. The process is that air is compressed and cooled, and the air is liquefied, and the gas and liquid are contacted on the rectifying tower plate by utilizing the difference of the boiling points of oxygen and nitrogen components (the boiling point of oxygen is 90K and the boiling point of nitrogen is 77K under the atmospheric pressure) to carry out mass and heat exchange, the oxygen component with high boiling point is continuously condensed into liquid from steam, the nitrogen component with low boiling point is continuously transferred into steam, so that the nitrogen content in the rising steam is continuously increased, and the oxygen content in the down-flow liquid is increasingly higher, thereby separating oxygen from nitrogen.
2. Pressure swing adsorption: the pressure swing adsorption method is also called molecular sieve air separation method, and the principle is that the molecular sieve selectively adsorbs oxygen and nitrogen components in the air to separate the air to obtain oxygen. When the air is pressurized and passes through the adsorption layer of the molecular sieve adsorption tower, nitrogen molecules are preferentially adsorbed, and oxygen molecules are left in the gas phase to become finished oxygen. When the nitrogen component in the adsorbent is adsorbed to saturation, nitrogen molecules adsorbed on the surface of the adsorbent are desorbed by a decompression or vacuum-pumping method and are sent out of a boundary region, so that the adsorption capacity of the adsorbent is recovered.
3. Membrane separation method: the basic principle of membrane separation is based on the fact that the transfer rates of components in air, pushed by pressure, through membranes are different, and thus gas separation is achieved. The method adopts certain high molecular polymers with selective permeability to the activity of different gases, and uses proper high molecular polymers to prepare hollow fibers, thereby realizing the separation of various gases in the air and obtaining the required gases.
Example 1:
for a large-scale kiln, oxygen is generated by adopting a deep cooling method and CO2 in circulating flue gas of a glass kiln is used as a combustion improver for oxygen-enriched combustion of the glass kiln. The process is specifically described as follows:
the oxygen preparation device 1 of fig. 1 is used for compressing and cooling air, liquefying the air, contacting gas and liquid on a rectifying tower plate by utilizing the difference of the boiling points of oxygen and nitrogen components, carrying out mass and heat exchange, continuously condensing the oxygen component with high boiling point from steam into liquid, continuously transferring the nitrogen component with low boiling point into the steam, continuously increasing the nitrogen content in the rising steam, and increasing the oxygen content in the downflow liquid, thereby separating the oxygen and the nitrogen to obtain the oxygen with the purity of more than 99.6 v%.
Circulating flue gas CO in FIG. 12The recovery device 2 recovers the kiln exhaust gas. The flue gas purification system 8 in fig. 1 includes a waste heat recovery system, a dust removal system, and a desulfurization system. After the flue gas generated by the glass kiln 7 passes through the flue gas purification system 8, part of the circulating flue gas is led out and enters the circulating flue gas CO2The recovery device 2 and the rest are discharged through a chimney 9. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; as shown in fig. 1, oxygen produced by cryogenic separation is metered and regulated by a flow indicator controller FIC and then sent to an oxygen-enriched mixer 4 through an oxygen pipeline; oxygen and CO in recycled flue gas2The oxygen is mixed into 23-35 v% of oxygen enrichment in an oxygen enrichment mixer 4, the pressure is 0.05-0.2 MPa, and the oxygen enrichment is transmitted to a combustion system of a glass kiln through an oxygen enrichment conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched entering the combustion system of the glass kiln.
In the raw material feeding optimization system 6, the raw materials of silica sand, soda ash, dolomite, limestone, mirabilite and the like of the glass kiln can carry and adsorb air when entering the glass kiln, and CO in the circulating flue gas is utilized2The raw material feeding system is isolated and replaced, and the generation of raw material type nitrogen oxides is avoided.
In the glass kiln 7, CO in the circulating flue gas is utilized2The parts of the glass kiln which are easy to leak air are isolated by methods such as air seal, air curtain and the like, so that the generation of thermal nitrogen oxides is avoided.
It should be noted that, at the initial stage of starting the glass kiln, air is adopted for combustion supporting, after the flue gas is generated, oxygen enrichment prepared by mixing circulating flue gas and oxygen is used as a combustion improver to gradually replace air for combustion supporting, and after 5-10 hours of circulation, nitrogen in the flue gas is gradually replaced by CO2Replacing the nitrogen-free smoke gas by replacement, and enabling the oxygen-enriched combustion-supporting to enter a normal operation state; during the operation of multiple series of kilns, nitrogen-free flue gas can be mutually protected.
Example 2:
for small and medium-sized kilns, the pressure swing adsorption method is adopted to produce oxygen and CO in circulating flue gas of the glass kiln2The combustion improver is used for oxygen-enriched combustion of the glass kiln. The process is specifically described as follows:
in the oxygen production apparatus 1 shown in fig. 1, when oxygen is produced by a pressure swing adsorption method, nitrogen molecules are preferentially adsorbed and oxygen molecules are left in a gas phase to become oxygen product when air passes through an adsorption layer of a molecular sieve adsorption tower after being pressurized. When the nitrogen component in the adsorbent is adsorbed to saturation, nitrogen molecules adsorbed on the surface of the adsorbent are desorbed by a decompression or vacuum-pumping method and are sent out of a boundary region, so that the adsorption capacity of the adsorbent is recovered. Thereby separating oxygen and nitrogen to obtain oxygen with the purity of 90-95 v%.
Circulating flue gas CO in FIG. 12The recovery device 2 recovers the kiln exhaust gas. The flue gas purification system 8 in fig. 1 includes a waste heat recovery system, a dust removal system, and a desulfurization system. After the flue gas generated by the glass kiln 7 passes through the flue gas purification system 8, part of the circulating flue gas is led out and enters the circulating flue gas CO2The recovery device 2 and the rest are discharged through a chimney 9. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; in addition, as shown in FIG. 1, oxygen produced by cryogenic separation is passed throughThe flow indicator controller FIC is used for metering and adjusting and then sending the mixture to an oxygen-enriched mixer 4 through an oxygen pipeline; oxygen and CO in recycled flue gas2The oxygen is mixed into 23-35 v% of oxygen enrichment in an oxygen enrichment mixer 4, the pressure is 0.05-0.2 MPa, and the oxygen enrichment is transmitted to a combustion system of a glass kiln through an oxygen enrichment conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched entering the combustion system of the glass kiln.
In the raw material feeding optimization system 6, the raw materials of silica sand, soda ash, dolomite, limestone, mirabilite and the like of the glass kiln can carry and adsorb air when entering the glass kiln, and CO in the circulating flue gas is utilized2The raw material feeding system is isolated and replaced, and the generation of raw material type nitrogen oxides is avoided.
In the glass kiln 7, CO in the circulating flue gas is utilized2The parts of the glass kiln which are easy to leak air are isolated by methods such as air seal, air curtain and the like, so that the generation of thermal nitrogen oxides is avoided.
It should be noted that, at the initial stage of starting the glass kiln, air is adopted for combustion supporting, after the flue gas is generated, oxygen enrichment prepared by mixing circulating flue gas and oxygen is used as a combustion improver to gradually replace air for combustion supporting, and after 5-10 hours of circulation, nitrogen in the flue gas is gradually replaced by CO2Replacing the nitrogen-free smoke gas by replacement, and enabling the oxygen-enriched combustion-supporting to enter a normal operation state; during the operation of multiple series of kilns, nitrogen-free flue gas can be mutually protected.
Example 3:
for small and medium-sized kilns, the CO in the circulating flue gas of the glass kiln is prepared by adopting a membrane separation method2The combustion improver is used for oxygen-enriched combustion of the glass kiln. The process is specifically described as follows:
when the oxygen preparation device 1 in fig. 1 adopts a membrane separation method to prepare oxygen, after the pressure of air is increased, the air is made into hollow fibers by combining high molecular polymers, and oxygen is separated. Thereby obtaining the oxygen with the purity of 93-99.5 v%.
Circulating flue gas CO in FIG. 12 Recovery device 2 pairs of kilnsAnd recovering the discharged gas. The flue gas purification system 8 in fig. 1 includes a waste heat recovery system, a dust removal system, and a desulfurization system. After the flue gas generated by the glass kiln 7 passes through the flue gas purification system 8, part of the circulating flue gas is led out and enters the circulating flue gas CO2The recovery device 2 and the rest are discharged through a chimney 9. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; in addition, as shown in fig. 1, oxygen produced by cryogenic separation is metered and regulated by a flow indicator controller FIC and then sent to an oxygen-enriched mixer 4 through an oxygen pipeline; oxygen and CO in recycled flue gas2The oxygen is mixed into 23-35 v% of oxygen enrichment in an oxygen enrichment mixer 4, the pressure is 0.05-0.2 MPa, and the oxygen enrichment is transmitted to a combustion system of a glass kiln through an oxygen enrichment conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched entering the combustion system of the glass kiln.
In the raw material feeding optimization system 6, the raw materials of silica sand, soda ash, dolomite, limestone, mirabilite and the like of the glass kiln can carry and adsorb air when entering the glass kiln, and CO in the circulating flue gas is utilized2The raw material feeding system is isolated and replaced, and the generation of raw material type nitrogen oxides is avoided.
In the glass kiln 7, CO in the circulating flue gas is utilized2The parts of the glass kiln which are easy to leak air are isolated by methods such as air seal, air curtain and the like, so that the generation of thermal nitrogen oxides is avoided.
It is noted that, in the initial stage of the glass kiln, air is adopted for combustion supporting, and after the flue gas is generated, the oxygen-enriched air prepared by mixing the circulating flue gas and the oxygen is used as a combustion improver to gradually replace the oxygen-enriched airAir is used for combustion supporting, and after 5-10 hours of circulation, nitrogen in the flue gas is gradually replaced by CO2Replacing the nitrogen-free smoke gas by replacement, and enabling the oxygen-enriched combustion-supporting to enter a normal operation state; during the operation of multiple series of kilns, nitrogen-free flue gas can be mutually protected.
The present invention has been described above with reference to the above embodiments, but the present invention is not limited to the above embodiments, and the present invention is also included in the present invention by appropriately combining or replacing the structures of the embodiments. Further, modifications such as changes in the combination of the embodiments and the order of processing can be appropriately adapted to the embodiments based on knowledge in the art, and modifications to the embodiments such as various design changes can be added to the embodiments, and embodiments to which such modifications are added can be included in the scope of the present invention.
Claims (4)
1. Nitrogen-free gas glass kiln oxygen + CO2The circulating combustion system is characterized in that the nitrogen-free gas glass kiln is filled with oxygen and CO2The circulating combustion system includes:
the oxygen preparation device is used for preparing oxygen as an oxygen source;
circulating flue gas CO2The recovery device is used for recovering part of the circulating flue gas after waste heat recovery, dust removal and desulfurization so as to recover CO in the circulating flue gas of the glass kiln2As the distribution of oxygen-enriched gas;
blower for circulating flue gas CO2CO recovered by recovery device2Adjusting the pressure;
an oxygen-enriched mixing device for the oxygen prepared by the oxygen preparation device and the circulating flue gas CO after pressure adjustment2CO recovered by recovery device2Mixing to obtain oxygen-enriched gas as a combustion improver of the glass kiln;
the raw material feeding device is used for supplying raw materials used by the glass kiln to the glass kiln;
a glass kiln;
the oxygen-enriched conveying pipeline is used for connecting the oxygen-enriched mixing device with the glass kiln;
the flue gas purification system comprises a waste heat recovery system, a dust removal system and a desulfurization system and is used for carrying out waste heat recovery, dust removal and desulfurization on the circulating flue gas generated by the glass kiln;
and the chimney is used for emptying the circulating flue gas after partial waste heat recovery, dust removal and desulfurization.
2. The nitrogen-free gas glass kiln oxygen + CO of claim 12The circulating combustion system is characterized in that a flow indication controller is also arranged between the blower and the oxygen-enriched mixing device.
3. The nitrogen-free gas glass kiln oxygen + CO of claim 12The circulating combustion system is characterized in that a flow indicator controller is also arranged between the oxygen preparation device and the oxygen-enriched mixing device.
4. The nitrogen-free gas glass kiln oxygen + CO of claim 12The circulating combustion system is characterized in that an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument are arranged on the oxygen-enriched conveying pipeline.
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