CN215524200U - Oxygen-enriched combustion device with coupled carbon dioxide flue gas circulation function - Google Patents
Oxygen-enriched combustion device with coupled carbon dioxide flue gas circulation function Download PDFInfo
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- CN215524200U CN215524200U CN202122072353.0U CN202122072353U CN215524200U CN 215524200 U CN215524200 U CN 215524200U CN 202122072353 U CN202122072353 U CN 202122072353U CN 215524200 U CN215524200 U CN 215524200U
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
Abstract
The utility model provides an oxygen-enriched combustion device with a coupled carbon dioxide flue gas circulation function, which comprises a main air channel, a primary air channel, a secondary air channel, an oxygen supply pipeline, a fuel supply pipeline and a carbon dioxide flue gas circulation system, wherein a combustion-supporting fluid medium in the main air channel is a mixed gas of carbon dioxide and oxygen, and combustion-supporting air in the main air channel is divided into the primary air channel and the secondary air channel. By adopting the technical scheme of the utility model, the oxygen-enriched combustion can be applied in the field of low-temperature heating, the concentration of carbon dioxide in the discharged flue gas can be greatly improved, the heating radiation heat efficiency is improved, the concentration of carbon dioxide in the dry-basis flue gas after combustion can reach 90-96%, and carbon capture is facilitated; carbon dioxide is circularly introduced into the combustion process, so that the participation of nitrogen in the air is avoided, and the emission of nitrogen oxides after combustion is extremely low.
Description
Technical Field
The utility model relates to the technical field of burners, in particular to an oxygen-enriched combustion device with a coupling carbon dioxide flue gas circulation function.
Background
In the field of combustion applications, the most widespread application is still the use of air as a combustion medium to react with the fuel and release heat. Although the air as combustion-supporting medium has the advantage of low cost, the disadvantages are also very obvious, such as low heating efficiency, NOx emission and the like. Therefore, the oxygen-enriched combustion technology has been continuously popularized and applied in a plurality of fields in recent years and is more generally accepted by the industry.
The oxygen-enriched combustion technology has been widely applied in the fields of ferrous metallurgy, non-ferrous metal smelting, glass melting and the like due to the characteristics of high combustion temperature and high thermal efficiency. However, in other fields, the application of oxygen-enriched combustion in the field of low-temperature heating is hindered because the required process temperature is relatively low, and the flame temperature is relatively higher after the high-concentration oxygen and the fuel are subjected to combustion reaction.
As the carbon peak-to-peak carbon neutralization step is approaching, the need for carbon reduction is becoming more stringent. For carbon dioxide capture processes, the higher the carbon dioxide concentration in the flue gas, the lower the cost to operate. In many industrial heating processes, the carbon dioxide concentration in the exhaust flue gas is often very low because air is used as a combustion medium, which is a challenge to the economy of carbon capture.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide an oxygen-enriched combustion device coupled with the carbon dioxide flue gas circulation function.
In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows: an oxygen-enriched combustion device with a coupling carbon dioxide flue gas circulation function comprises a main air duct, a primary air channel, a secondary air channel, an oxygen supply pipeline, a fuel supply pipeline and a carbon dioxide flue gas circulation system,
a flue gas outlet of the carbon dioxide flue gas circulating system is communicated with the main air duct;
an outlet of the oxygen supply pipeline is provided with an oxygen nozzle which is arranged in the main air duct;
combustion-supporting air of the main air duct is divided into the primary air channel and the secondary air channel, and the secondary air channel surrounds the primary air channel or is positioned on two sides of the primary air channel; and a fuel nozzle is installed at the outlet of the fuel supply pipeline and embedded in the primary air channel.
By adopting the technical scheme of the utility model, the combustion-supporting fluid medium in the main air duct is the mixed gas of carbon dioxide and oxygen, so that oxygen-enriched combustion can be applied to the field of low-temperature heating, the concentration of carbon dioxide in the discharged flue gas can be greatly improved, the heating radiation thermal efficiency is improved, the concentration of carbon dioxide in the dry-basis flue gas after combustion can reach 90-96%, and carbon capture is facilitated; carbon dioxide is circularly introduced into the combustion process, so that the participation of nitrogen in the air is avoided, and the emission of nitrogen oxides after combustion is extremely low.
And further, the system also comprises a first flow controller used for controlling the oxygen flow in the oxygen supply pipeline, and a second flow controller used for controlling the flue gas flow entering the total air flue from the carbon dioxide flue gas circulation system.
By adopting the preferable scheme, the mixing proportion of oxygen and carbon dioxide is conveniently controlled, and the oxygen concentration of combustion-supporting gas is regulated and controlled.
Further, the first flow controller and the second flow controller jointly control combustion-supporting gas in the main air duct to be in a low-oxygen concentration state, wherein the low-oxygen concentration state means that the volume of oxygen accounts for 15% -30% of the volume fraction of the total combustion-supporting gas.
By adopting the preferable scheme, the oxygen concentration in proper combustion-supporting gas and the high carbon dioxide concentration in flue gas can be adjusted according to different temperature system requirements in the field of low-temperature heating, and the heating radiation heat efficiency can be improved.
Further, the first flow controller and the second flow controller jointly control the combustion-supporting gas in the main air duct to be in a high oxygen concentration state, wherein the high oxygen concentration state means that the volume of oxygen accounts for 30% -100% of the volume fraction of the total combustion-supporting gas.
By adopting the preferable scheme, the reasonable proportion of the oxygen and the carbon dioxide can be controlled according to different temperature system requirements in the field of high-temperature heating, and the oxygen concentration can be increased until the oxygen is completely used, so that the requirement of rapid temperature rise is met.
Furthermore, the combustion-supporting air volume in the primary air channel accounts for 50% -70% of the total combustion-supporting air volume, and the combustion-supporting air volume in the secondary air channel accounts for 30% -50% of the total combustion-supporting air volume.
By adopting the preferable scheme, staged combustion is formed by distributing primary air and secondary air, the local hot spot temperature of flame is reduced, and nitrogen oxides generated after air leaks in are inhibited.
Further, the oxygen spray head faces to the smoke inlet of the main air duct.
With the preferred arrangement described above, mixing of oxygen with carbon dioxide is facilitated.
Further, the oxygen shower nozzle includes terminal surface portion, conical surface portion and circumference portion, terminal surface portion seals, be equipped with a plurality of first ventholes that become the circumference array and distribute in the conical surface portion, be equipped with a plurality of second ventholes that become the circumference array and distribute in the circumference portion.
By adopting the preferable scheme, the mixing uniformity of the oxygen and the carbon dioxide is further improved.
Furthermore, the end face of the fuel nozzle is closed, and the circumferential wall of the fuel nozzle is provided with fuel air outlets distributed in a circumferential array.
By adopting the preferable scheme, the mixing of the fuel and the primary combustion-supporting air is promoted.
Furthermore, the outlet of the primary air channel is a rectangular opening with the width larger than the outer diameter of the fuel spray heads, the number of the fuel spray heads is multiple, and the multiple fuel spray heads are arranged side by side.
Adopt above-mentioned preferred scheme, flame distribution is more even, improves the heating temperature degree of consistency.
Further, the outlet of the secondary air channel is a plurality of round holes distributed in rows.
By adopting the preferable scheme, the ejection speed of the secondary combustion-supporting air is promoted, so that the secondary combustion-supporting air fully participates in the secondary combustion, and the heating efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is an end view of the primary and secondary air ducts of the present invention;
FIG. 3 is a schematic structural view of an embodiment of the oxygen nozzle of the present invention.
Names of corresponding parts represented by numerals and letters in the drawings:
10-total air duct; 20-primary air channel; 201-rectangular opening; 30-secondary air channel; 301-circular hole; 40-oxygen supply line; 41-oxygen shower nozzle; 411-end face portion; 412-a conical surface section; 413-a circumferential portion; 414-first outlet hole; 415-a second outlet hole; 50-fuel supply line; 51-a fuel injector; 511-fuel outlet holes; 60-carbon dioxide flue gas circulation system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, one embodiment of the present invention is: an oxygen-enriched combustion device with coupled carbon dioxide flue gas circulation function comprises a main air duct 10, a primary air channel 20, a secondary air channel 30, an oxygen supply pipeline 40, a fuel supply pipeline 50 and a carbon dioxide flue gas circulation system 60,
the flue gas outlet of the carbon dioxide flue gas circulating system 60 is communicated with the main air duct 10;
an oxygen nozzle 41 is arranged at the outlet of the oxygen supply pipeline 40, and the oxygen nozzle 41 is arranged in the main air duct 10;
the combustion-supporting air of the main air duct 10 is divided into a primary air channel 20 and a secondary air channel 30, and the secondary air channel 30 surrounds the primary air channel 20 or is positioned at two sides of the primary air channel 20;
a fuel nozzle 51 is attached to the outlet of the fuel supply pipe 50, and the fuel nozzle 51 is fitted in the primary air passage 20.
The carbon dioxide flue gas recirculation system 60 is available in the prior art for the purpose of recovering and capturing carbon dioxide, and is not an innovative point of the present application and its structure will not be described in detail here.
The beneficial effect of adopting above-mentioned technical scheme is: the combustion-supporting fluid medium in the main air duct is a mixed gas of carbon dioxide and oxygen, so that oxygen-enriched combustion can be applied to the field of low-temperature heating, the concentration of carbon dioxide in the discharged flue gas can be greatly improved, the heating radiation heat efficiency is improved, the concentration of carbon dioxide in the dry-basis flue gas after combustion can reach 90% -96%, and carbon capture is facilitated; carbon dioxide is circularly introduced into the combustion process, so that the participation of nitrogen in the air is avoided, and the emission of nitrogen oxides after combustion is extremely low.
In other embodiments of the present invention, the system further comprises a first flow controller for controlling the oxygen flow in the oxygen supply pipeline, and a second flow controller for controlling the flue gas flow entering the total air flue from the carbon dioxide flue gas circulation system. The beneficial effect of adopting above-mentioned technical scheme is: the mixing proportion of oxygen and carbon dioxide can be conveniently controlled, and the oxygen concentration of combustion-supporting gas can be regulated and controlled.
In other embodiments of the present invention, the first flow controller and the second flow controller jointly control the combustion-supporting gas in the total air duct to be in a low oxygen concentration state, wherein the low oxygen concentration state means that the oxygen volume accounts for 15% -30% of the volume fraction of the total combustion-supporting gas. The beneficial effect of adopting above-mentioned technical scheme is: the oxygen concentration in proper combustion-supporting gas and the high carbon dioxide concentration in the flue gas can be adjusted according to different temperature regulation requirements in the field of low-temperature heating, and the heating radiation heat efficiency can be improved.
In other embodiments of the present invention, the first flow controller and the second flow controller jointly control the combustion supporting gas in the total air duct to be in a high oxygen concentration state, where the high oxygen concentration state means that the volume of oxygen accounts for 30% -100% of the volume fraction of the total combustion supporting gas. The beneficial effect of adopting above-mentioned technical scheme is: the reasonable proportion of oxygen and carbon dioxide can be controlled according to different temperature system requirements in the field of high-temperature heating, the oxygen concentration can be increased until the oxygen is completely used, and the requirement of rapid temperature rise is met.
In other embodiments of the present invention, the combustion supporting air volume in the primary air passage 20 accounts for 50% to 70% of the total combustion supporting air volume, and the combustion supporting air volume in the secondary air passage 30 accounts for 30% to 50% of the total combustion supporting air volume. The beneficial effect of adopting above-mentioned technical scheme is: by distributing the primary air and the secondary air, staged combustion is formed, the local hot spot temperature of flame is reduced, and nitrogen oxides generated after air leaks in are inhibited.
As shown in fig. 1 and 3, in other embodiments of the present invention, the oxygen nozzles 41 face the flue gas inlet of the main duct 10. The beneficial effect of adopting above-mentioned technical scheme is: promoting the mixing of oxygen and carbon dioxide.
In other embodiments of the present invention, as shown in fig. 1 and 3, the oxygen nozzle 41 comprises a face portion 411, a conical portion 412 and a circumferential portion 413, wherein the face portion 411 is closed, the conical portion 412 is provided with a plurality of first outlet holes 414 distributed in a circumferential array, and the circumferential portion 413 is provided with a plurality of second outlet holes 415 distributed in a circumferential array. The beneficial effect of adopting above-mentioned technical scheme is: further improving the mixing uniformity of the oxygen and the carbon dioxide.
In other embodiments of the present invention, the end face of the fuel nozzle 51 is closed, and the circumferential wall of the fuel nozzle 51 is provided with fuel outlet holes 511 distributed in a circumferential array. The beneficial effect of adopting above-mentioned technical scheme is: the mixing of the fuel and the primary combustion-supporting air is promoted.
In other embodiments of the present invention, as shown in fig. 2, the outlet of the primary air passage 20 is a rectangular opening having a width larger than the outer diameter of the fuel nozzle 51, the number of the fuel nozzles 51 is plural, and the plural fuel nozzles 51 are arranged side by side. The beneficial effect of adopting above-mentioned technical scheme is: the flame distribution is more uniform, and the heating temperature uniformity is improved.
In other embodiments of the utility model, as shown in fig. 2, the outlet of the overfire air duct 30 is a plurality of circular holes 301 arranged in a row. The beneficial effect of adopting above-mentioned technical scheme is: the spraying speed of secondary combustion-supporting air is promoted, so that the secondary combustion-supporting air fully participates in secondary combustion, and the heating efficiency is improved.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (7)
1. An oxygen-enriched combustion device with a coupled carbon dioxide flue gas circulation function is characterized by comprising a main air duct, a primary air channel, a secondary air channel, an oxygen supply pipeline, a fuel supply pipeline and a carbon dioxide flue gas circulation system,
a flue gas outlet of the carbon dioxide flue gas circulating system is communicated with the main air duct;
an outlet of the oxygen supply pipeline is provided with an oxygen nozzle which is arranged in the main air duct;
combustion-supporting air of the main air duct is divided into the primary air channel and the secondary air channel, and the secondary air channel surrounds the primary air channel or is positioned on two sides of the primary air channel;
and a fuel nozzle is installed at the outlet of the fuel supply pipeline and embedded in the primary air channel.
2. An oxycombustion device coupled with carbon dioxide flue gas circulation function according to claim 1, characterized in that, it further comprises a first flow controller for controlling oxygen flow in the oxygen supply pipeline, and a second flow controller for controlling flue gas flow of the carbon dioxide flue gas circulation system into the total air flue.
3. An oxycombustion device coupled with carbon dioxide flue gas circulation function according to claim 1, characterized in that the oxygen shower nozzle faces the flue gas inlet of the main duct.
4. An oxycombustion device of coupling carbon dioxide flue gas circulation function of claim 3, characterized in that, the oxygen shower nozzle includes terminal surface portion, conical surface portion and circumference portion, terminal surface portion is sealed, be equipped with a plurality of first ventholes that become the distribution of circumference array on the conical surface portion, be equipped with a plurality of second ventholes that become the distribution of circumference array on the circumference portion.
5. An oxycombustion device coupled with carbon dioxide flue gas circulation function according to claim 1, characterized in that the end face of the fuel nozzle is closed, and the circumferential wall of the fuel nozzle is provided with fuel gas outlets distributed in a circumferential array.
6. An oxycombustion device coupled with carbon dioxide flue gas circulation function according to claim 5, characterized in that the outlet of the primary air channel is a rectangular opening with a width larger than the outer diameter of the fuel nozzle, the number of the fuel nozzles is multiple, and the multiple fuel nozzles are arranged side by side.
7. An oxycombustion device coupled with carbon dioxide flue gas circulation function according to claim 6, characterized in that the outlet of the secondary air channel is a plurality of round holes distributed in rows.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114935144A (en) * | 2022-04-29 | 2022-08-23 | 东北大学 | Flue gas circulation's whirl oxygen boosting combustor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114935144A (en) * | 2022-04-29 | 2022-08-23 | 东北大学 | Flue gas circulation's whirl oxygen boosting combustor |
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