CN112524605B - Radiant tube capable of automatically sucking flue gas to realize flameless combustion - Google Patents
Radiant tube capable of automatically sucking flue gas to realize flameless combustion Download PDFInfo
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- CN112524605B CN112524605B CN202011409495.5A CN202011409495A CN112524605B CN 112524605 B CN112524605 B CN 112524605B CN 202011409495 A CN202011409495 A CN 202011409495A CN 112524605 B CN112524605 B CN 112524605B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a radiant tube capable of automatically sucking flue gas to realize flameless combustion, which comprises a U-shaped radiant tube body, wherein two ends of the tube body are respectively provided with a fuel and combustion-supporting air inlet and a flue gas outlet; the connecting pipe for flue gas backflow is installed between two ports of the radiant tube body, a baffle is welded in the middle of the axis of the connecting pipe, the upper end of the baffle is tangent to the inner diameter of the radiant tube, the lower end of the baffle extends to the flue gas outlet end, when the inner diameter of the radiant tube is R, the length of the baffle, which is longer than the connecting pipe, is 0.6R-0.8R, the plane of the baffle is parallel to the two ports of the radiant tube, and the right side of the middle upper portion of the baffle is provided with an arc-shaped curved surface, and the arc surface of the arc-shaped curved surface faces towards the U-shaped radiant tube body. The radiant tube has the characteristics of simple structure, easy manufacture, low cost, high heating efficiency, strong applicability and the like, and can automatically suck flue gas to dilute fuel and combustion-supporting air without selecting a specific radiant tube burner when the radiant tube is used, thereby realizing flameless combustion in the radiant tube.
Description
Technical Field
The invention relates to a U-shaped radiant tube, in particular to a radiant tube which can automatically suck smoke in the radiant tube to realize flameless combustion.
Background
Many conventional direct heating devices have not been able to meet the requirements of modern industrial quality and environmental protection. When metal materials are heated, the gas radiant tube is common industrial indirect heating equipment and is widely applied to the heat treatment industry. The heat generated by the burner is released from the burning flame and flue gases to the radiant tube and transferred to the product being heated in the form of thermal radiation, the high temperature flue gases not coming into direct contact with the product being heated, and the high quality of the product being heated is produced by this indirect heating. The radiant tube is used as an important heat device for realizing the heating function, so that how to improve the surface temperature uniformity of the radiant tube and prolong the service life of the radiant tube becomes an important target concerned by researchers at home and abroad; meanwhile, along with the implementation of the increasingly strict energy-saving and emission-reducing policy, the heat efficiency is improved as much as possible, the content of nitrogen oxides in high-temperature combustion products in the radiant tube is reduced, and the method becomes the direction of efforts of numerous researchers.
For the current using situation of the existing radiant tube in China, the temperature difference of the wall surface of the radiant tube is about 200 ℃, the requirement of more uniform temperature required by heat treatment of metal materials cannot be met, and meanwhile, the large temperature difference of the wall surface of the radiant tube can cause creep damage to the radiant tube body in service under the high-temperature condition, so that the service life of the radiant tube is directly deteriorated. In the aspect of environmental protection, in the current combustion mode, fuel is combusted in the radiant tube, a large amount of NOx is generated, so that air pollution, acid rain and the like are caused, huge damage is generated to the environment, and the NOx emission amount of the traditional radiant tube is about 1000 ppm.
NOx is classified into three groups depending on the formation pathway: fuel type, rapid type, thermal type. Thermal NOx is the major source of NOx in the products of fuel combustion and is formed in large quantities when the combustion temperature is above 1723K (i.e., 1450 c). However, the peak temperature value is generally above 2000K by adopting the traditional combustion mode, which undoubtedly causes the generation of a large amount of NOx.
Therefore, in order to further improve the radiant tube thermal efficiency and reduce the NOx emission, and improve the radiant tube temperature uniformity, new combustion technologies are required. Mild and extremely Low Oxygen Dilution combustion (MILD combustion, also known as flameless combustion or flameless oxidation) is characterized by uniform heat distribution, Low reaction rate, no visible flame front, uniform material concentration distribution, Low combustion peak temperature, ultra-Low pollutant emissions (mainly CO and NOx), and Low noise. Also, mild combustion has now been considered as one of the most promising combustion technologies. Achieving MILD combustion requires that the furnace temperature be above the auto-ignition point of the fuel and the oxygen concentration be sufficiently low, which can be achieved by high velocity jet entrainment of the flue gas at the radiant tube inlet.
In view of the above-mentioned advantages of MILD combustion, a number of researchers have creatively attempted to achieve MILD combustion within radiant tubes to overcome the development bottleneck of current radiant tubes. However, these studies mainly focus on the modification of the radiant tube burner, and the modification of the radiant tube burner has been reported only rarely. In the early years, in order to reduce the emission of NOx, technicians in the industry realize a Radiant Tube flue gas internal circulation technology by additionally arranging a connecting pipe, but the flue gas circulation quantity is quite limited, and the effect of reducing NOx is still to be further improved, a document disclosed in Journal of energy Engineering in 2018, "comprehensive Performance Assessment of a U-Shaped regenerative radial Tube arrangement and MILD Combustion models" reports that a Radiant Tube is modified, and attempts are made to use a specially-designed gas and Combustion-supporting air inlet structure on the basis of a designed U-Shaped Radiant Tube structure with a connecting pipe, so that a large amount of high-temperature flue gas can be sucked, and MILD Combustion is successfully realized in experiments. However, the structure is simulated and tested, and the phenomenon that the radiant tube has serious partial burning during operation although the smoke entrainment is large is found, the temperature distribution is extremely uneven, the temperature peak value is still high, and MILD combustion cannot be realized. Although the technicians in the industry have a consensus that the entrainment of the flue gas in the radiant tube is realized by adding the connecting tube, no radiant tube capable of realizing flameless combustion has been reported so far.
The research on the MILD combustion technology in industrial furnaces in the steel industry has mainly focused on open flame heating furnaces. The MILD combustion is realized in the open fire heating furnace, and the distribution of the inlet holes and the exhaust holes of the burner needs to be redesigned so as to optimize the mixing of air and fuel gas in the furnace and the entrainment of smoke. After the open flame heating furnace burner is improved, the traditional combustion mode is adopted to improve the temperature of a hearth, then the incident pressure of fuel gas and air is increased, and the incident momentum of the gas is improved, so that the entrainment backflow of the flue gas in the hearth is enhanced, the oxygen concentration of a flame area is reduced, and the MILD combustion in the open flame heating furnace is realized.
At present, a new radiant tube structure is urgently needed to be innovated, so that the MILD combustion in the radiant tube can be realized without changing a commonly matched radiant tube burner, and the effects of enhancing the surface temperature uniformity of the radiant tube, reducing the emission of NOx, improving the heat efficiency and prolonging the service life of equipment are achieved.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a radiant tube which has a simple structure, is easy to manufacture and low in cost, can automatically suck flue gas to realize flameless combustion, and can realize MILD combustion in the radiant tube without changing a conventional radiant tube burner matched with the radiant tube for use, namely, the radiant tube can automatically suck the flue gas to a greater extent when in use, so that the return flow of the flue gas is enough to dilute fuel and combustion-supporting air, and further the conventional combustion mode in the conventional radiant tube is changed to realize MILD combustion in the radiant tube.
In order to achieve the purpose, the invention adopts the technical scheme that: the radiant tube capable of automatically sucking flue gas to realize flameless combustion comprises a U-shaped radiant tube body, wherein two ends of the radiant tube body are respectively provided with a fuel and combustion-supporting air inlet and a flue gas outlet, and a connecting pipe for flue gas backflow is connected between the fuel and combustion-supporting air inlet and the flue gas outlet; a baffle is welded in the middle of the axis in the flue gas backflow connecting pipe, the upper end of the baffle is tangent to the inner diameter of the radiant tube, the baffle is longer than the connecting pipe, the lower end of the baffle extends into the radiant tube body at the flue gas outlet end, the plane of the baffle is parallel to the two end openings of the radiant tube, the middle upper part of the right side of the baffle is provided with an arc-shaped curved surface, the arc surface of the arc-shaped curved surface faces towards the U-shaped radiant tube body, the circle center of the arc-shaped curved surface is located outside the baffle, and the chord length D of the joint of the arc-shaped curved surface and the baffle is equal to the width L of the baffle.
When the inner diameter of the radiant tube is R, the baffle is 0.6R-0.8R longer than the flue gas reflux connecting tube.
The baffle and the arc-shaped curved surface are parts which are manufactured separately and then are installed together, or the baffle and the arc-shaped curved surface are manufactured into a whole.
The flue gas backward flow connecting pipe be the passageway of entrainment flue gas backward flow, be used for improving the flue gas entrainment volume through increase flue gas backward flow connecting pipe diameter.
The connecting pipe for the backflow flue gas is arranged between the fuel and combustion air inlet and the flue gas outlet of the U-shaped radiant tube, so that the problems that the space in the radiant tube is small and a direct channel for the backflow of the flue gas is unavailable are solved. However, the connecting pipe for returning flue gas opens a direct passage for returning flue gas between the fuel and combustion air inlet end and the flue gas outlet, which is only a necessary structure for realizing the MILD combustion mode. Therefore, the invention further adopts a combined structure that a baffle plate with the length exceeding the length of the connecting pipe is welded in the middle of the axis of the connecting pipe for flue gas backflow and the baffle plate is provided with a circular arc curved surface, the circular arc surface of the circular arc curved surface faces the inner side of the radiant tube body, the upper end of the baffle plate is flush with the connecting pipe, the flow of the fuel and the combustion-supporting air which are incident from the upper end of the baffle plate is prevented from being influenced, the lower end of the baffle plate is longer than the connecting pipe, the lower end of the baffle plate extends into the radiant tube body at the flue gas outlet end, and the plane of the baffle plate is parallel to the two ports of the radiant tube, so that the lower end of the baffle plate can effectively prevent high-temperature flue gas from rapidly flowing from the lower port of the connecting pipe to the flue gas outlet, the baffle plate can change the flow direction of the flue gas, when the fuel and the combustion-supporting air at the fuel and combustion-supporting air inlet end of the fuel and combustion-supporting air pass through at high speed, the air pressure difference generated by the baffle plate rolls up a large amount of the flue gas flowing from the right side of the connecting pipe to the fuel and combustion-supporting air inlet of the connecting pipe, meanwhile, the flue gas on the left side of the baffle is also in a low-speed state and flows from bottom to top; the arc-shaped curved surface on the right side of the baffle is used for preventing smoke from forming small vortexes on the right side of the connecting pipe again, so that smoke backflow is quicker and smoother, the entrainment backflow smoke volume is more considerable, and the entrainment smoke backflow volume is obviously improved. The radiant tube of the invention forms a channel for automatically sucking flue gas by additionally arranging connecting pipes for returning flue gas at two port ends of the radiant tube and arranging a combined structure with a circular arc-shaped curved baffle in the connecting pipes, which is a key component for realizing MILD combustion in the radiant tube and is matched with a larger negative pressure area formed near a fuel and combustion-supporting air inlet, so that enough entrainment can be ensured, the fuel and the combustion-supporting air are diluted to a larger degree, and the MILD combustion is further realized in the radiant tube.
Compared with the prior art, the radiant tube capable of automatically sucking flue gas to realize flameless combustion has the advantages that:
the radiating tube has high applicability and is convenient to popularize and use. The radiant tube does not need to change the diameter and length of the tube body outside the radiant tube body, and main sizes of the original radiant tube such as the tube diameter and the length are kept, so that the radiant tube can perfectly adapt to the original use environment. The radiant tube can completely adapt to the original radiant tube burner and the annealing furnace, can be matched with the currently used burner for use, only needs the burner to ensure a larger incident speed, does not need a complex air distribution plate, a primary and secondary air structure and the like, greatly saves the design modification and manufacturing cost of the burner, can be directly connected with other devices connected with the rear part of a flue gas outlet, such as a heat exchanger for use, does not need to be redesigned, and is convenient to popularize and use.
The radiant tube increases the radiant area of the radiant tube. Through the development of the radiant tube in nearly 90 years, the pipe diameter and the length of the radiant tube have the optimal ranges, so that the radiant area has a relatively fixed value, and the area of the radiant tube can be increased on the premise of not influencing the performance of the radiant tube, so that the radiant tube is difficult to increase. On the premise of not influencing the performance of the U-shaped radiant tube, the invention adds the smoke backflow connecting tube, improves the radiant area, can improve the furnace temperature and improves the heat efficiency.
The radiant tube is high in heat efficiency. Because the radiant tube can automatically absorb the flue gas, the flue gas flows back in a large amount, on one hand, the flue gas and the combustion air are sufficiently diluted, and MILD combustion is realized; on the other hand, the high-temperature backflow flue gas carries a large amount of heat energy, and the heat energy is recycled in the radiant tube, so that the heat efficiency of the radiant tube is greatly improved.
The radiation tube is simple in structure, easy to manufacture and low in cost. According to the radiant tube, only a combined structure of a flue gas backflow connecting pipe, a baffle matched with the flue gas backflow connecting pipe and a circular arc-shaped curved surface is additionally arranged on a traditional U-shaped radiant tube, a flue gas backflow channel is provided, and the sufficient flue gas backflow amount can be guaranteed to be sucked, so that MILD combustion is realized, the temperature peak value in the radiant tube is less than 1723K at the moment, thermal NOx almost disappears, and the generation amount of the whole NOx is greatly reduced; in addition, because the combustion is carried out in the whole radiant tube, the temperature uniformity of the tube wall is greatly improved, and the extreme value of the temperature difference is below 40K; the combustion process is extremely noisy.
Drawings
Fig. 1 is a schematic view of the structure of the radiant tube of the present invention.
FIG. 2 is a schematic cross-sectional view of the flue gas recirculation connection pipe of the present invention.
FIG. 3 is a schematic view of the structure of the baffle and the arc-shaped curved surface of the invention.
FIG. 4 is a schematic view of a numerical simulation of a flue gas recirculation when connecting pipes are installed only at two ports of a radiant tube according to the present invention.
FIG. 5 is a schematic view of a smoke reflux numerical simulation when a baffle and a circular arc-shaped curved surface combined structure is installed in a smoke reflux connecting pipe according to the present invention.
In the above figures: the fuel combustion-supporting device comprises a radiant tube body 1, a fuel and combustion-supporting air inlet 2, a flue gas outlet 3, a connecting pipe 4, a baffle 5 and an arc-shaped curved surface 6.
Detailed Description
The following further describes the radiant tube capable of automatically sucking flue gas to realize flameless combustion according to the present invention with reference to the accompanying drawings and specific embodiments, wherein the accompanying drawings are simplified schematic drawings, which only schematically illustrate the basic structure of the present invention and only show the components related to the present invention. The terms "left side", "right side" and the like in the description of the present invention indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and thus, cannot be construed as limiting the present invention.
Example 1: the invention provides a radiant tube capable of automatically absorbing smoke to realize flameless combustion, which has a structure shown in figures 1, 2 and 3, and comprises a U-shaped radiant tube body 1, wherein the inner diameter of the radiant tube is R, and two ends of the radiant tube body are respectively provided with a fuel and combustion-supporting air inlet 2 and a smoke outlet 3; the fuel and combustion-supporting air inlet and the flue gas outlet are connected with a connecting pipe 4 used for flue gas backflow, a baffle plate 5 is welded in the middle of the axis of the connecting pipe, the baffle plate is longer than the connecting pipe, the upper end of the baffle plate is tangent to the inner diameter of the radiant tube, and the lower end of the baffle plate extends into the radiant tube body at the flue gas outlet end. In this embodiment, the baffle 5 and the arc-shaped curved surface 6 are two parts which are separately processed, and finally the arc-shaped curved surface and the baffle are mounted together.
When the radiant tube is used, fuel gas and combustion-supporting air are sprayed into the body 1 of the radiant tube at a high speed from the fuel and combustion-supporting air inlet 2, and the high-speed sprayed fuel gas and combustion-supporting air form a larger negative pressure area near the fuel and combustion-supporting air inlet, so that a pressure difference is formed between the high-speed sprayed fuel gas and combustion-supporting air and a connecting pipe and a flue gas outlet; the flue gas after the combustion reaction of the fuel gas and the combustion air flows to a flue gas outlet, and meets the head-on blocking of the baffle 5 on the way, the speed of the blocked flue gas is rapidly reduced, the high-temperature flue gas flows back from the right side of the connecting pipe 4 from bottom to top under the action of pressure difference, and the circular arc-shaped curved surface destroys the airflow vortex on the right side, so that the back flow of the flue gas on the right side is quicker and smoother; the flue gas on the left side of the baffle also flows back from bottom to top at a slightly lower velocity. The flue gas of connecting pipe both sides backward flow mixes with fuel and combustion air, makes fuel and combustion air obtain great degree dilution for the combustion reaction goes on in whole radiant tube, and then realizes flameless burning in the radiant tube.
Referring to fig. 4, when the flue gas reflux connecting pipe 4 is installed only at the inlet end and the outlet end of the radiant tube body 1, the numerical simulation of the radiant tube with the connecting pipe structure is performed by using simulation software ANSYS in a computer, and the result shows that: the high-temperature flue gas at the outlet end of the radiant tube can not effectively flow back in a large amount through the flue gas backflow connecting tube, the reason is that although fuel and combustion-supporting air at the inlet flow through at a high speed, a negative pressure zone is formed at the upper end of the flue gas backflow connecting tube, but when the high-temperature flue gas at the outlet end of the radiant tube flows through the lower end of the flue gas backflow connecting tube rapidly, due to the inertia effect, the high-temperature flue gas only has obvious backflow on the left side wall surface of the flue gas backflow connecting tube, namely flows from bottom to top, a vortex can be formed in the middle of the flue gas backflow connecting tube and the right side wall surface, the upward backflow of the flue gas is greatly hindered, the backflow amount of the flue gas is not enough to enable the fuel and the combustion-supporting air to be effectively diluted, and the MILD combustion in the radiant tube can not be realized. The small arrows in the figure indicate the direction and flow of the flue gas flow.
Referring to fig. 5, after the combined structure of the baffle plate with the length exceeding the length of the connecting pipe and the arc-shaped curved surface arranged on the baffle plate is adopted in the invention, the upper end of the baffle plate is flush with the flue gas reflux connecting pipe, so that the incident fuel and combustion-supporting air flow are prevented from being influenced by the upper end of the baffle plate, and the lower end of the baffle plate extends into the radiant tube body of the flue gas outlet end because the lower end of the baffle plate is longer than the connecting pipe, so that the lower end of the baffle plate is utilized to effectively prevent high-temperature flue gas from rapidly flowing from the lower end opening of the connecting pipe to the flue gas outlet, the baffle plate enables the flow direction of the flue gas to be changed, and when the fuel and the combustion-supporting air pass through the inlet end of the radiant tube at high speed, the generated air pressure difference can roll up a large amount of the flue gas. It can be seen from the comparison of fig. 4 and 5 that in fig. 5, the flue gas flows from bottom to top along the baffle plate to the fuel and combustion air inlet densely on the right side of the connecting pipe, the arc-shaped curved surface can prevent the flue gas from forming small eddies on the right side of the connecting pipe, the channel is narrower at the arc-shaped curved surface, the flow speed of the flue gas is increased, the flue gas flows densely and upwards, and the flue gas flows from bottom to top even though the speed of the flue gas is lower on the left side of the baffle plate; the baffle and the arc-shaped curved surface can make the flue gas backflow faster and smoother, the entrainment backflow flue gas volume is more considerable, and the flue gas backflow volume obviously improved can dilute fuel and combustion air to a large extent, so that MILD combustion is realized in the radiant tube.
Example 2: the invention provides a radiant tube capable of automatically sucking flue gas to realize flameless combustion, which has the same structure as that of the radiant tube in the embodiment 1, and the difference is that the pipe diameter of a connecting pipe 4 for flue gas backflow installed in the embodiment is moderately increased a little because the radiant tube burner is different from a radiant tube burner matched with the radiant tube, the pipe diameter of the connecting pipe is increased to improve the flue gas sucking amount, namely, the channel for flue gas sucking backflow is increased, so that the flue gas sucking amount is improved; meanwhile, the length of the lower end of the baffle plate in the embodiment, which is longer than the connecting pipe part, is 0.8R, namely the diameter of the radiant tube, which is extended out of the connecting pipe part, is 0.8 times of the diameter of the radiant tube, and meanwhile, the arc-shaped curved surface and the baffle plate are integrated into a whole; the rest of the structure and the embodiment are the same as those of the embodiment 1.
The invention provides a new U-shaped radiant tube, which can automatically suck smoke to a greater extent when in use without changing the appearance pipe diameter and length size of the original radiant tube and without selecting a specific radiant tube burner, so that the returned smoke can sufficiently dilute fuel and combustion-supporting air, thereby changing the traditional combustion mode in the radiant tube and realizing MILD combustion in the radiant tube. The radiant tube has the characteristics of simple structure, easy manufacture, low cost, high heating efficiency, strong applicability and the like, and is convenient to popularize and use.
Claims (2)
1. A radiant tube capable of automatically sucking flue gas to realize flameless combustion comprises a U-shaped radiant tube body, wherein two ends of the radiant tube body are respectively provided with a fuel and combustion-supporting air inlet and a flue gas outlet, and a connecting pipe for flue gas backflow is connected between the fuel and combustion-supporting air inlet and the flue gas outlet; the method is characterized in that: a baffle is welded in the middle of the axis in the flue gas reflux connecting pipe, the upper end of the baffle is tangent to the inner diameter of the radiant tube, the baffle is longer than the connecting pipe, the lower end of the baffle extends into the radiant tube body at the flue gas outlet end, the plane of the baffle is parallel to the two end openings of the radiant tube, the middle upper part of the right side of the baffle is provided with an arc-shaped curved surface, the arc-shaped curved surface is not a semicircle, the arc surface of the arc-shaped curved surface faces towards the U-shaped radiant tube body, the circle center of the arc-shaped curved surface is positioned outside the baffle, and the chord length D of the joint of the arc-shaped curved surface and the baffle is equal to the width L of the baffle;
when the inner diameter of the radiant tube is R, the baffle is 0.6R-0.8R longer than the flue gas reflux connecting tube;
the baffle and the arc-shaped curved surface are parts which are manufactured separately and then are installed together, or the baffle and the arc-shaped curved surface are manufactured into a whole.
2. The radiant tube capable of automatically entraining smoke to realize flameless combustion as claimed in claim 1, wherein: the flue gas backward flow connecting pipe be the passageway of entrainment flue gas backward flow, be used for improving the flue gas entrainment volume through increase flue gas backward flow connecting pipe diameter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3760392B2 (en) * | 1996-12-17 | 2006-03-29 | Ｊｆｅスチール株式会社 | Regenerative burner and radiant tube burner using the regenerative burner |
| JP3589389B2 (en) * | 1998-12-28 | 2004-11-17 | 株式会社オットー | Low NOX radiant tube burner |
| CN101936540B (en) * | 2010-10-08 | 2012-04-25 | 中冶南方(武汉)威仕工业炉有限公司 | Heat exchanger matched with radiant-tube burner for use |
| CN104633661B (en) * | 2014-12-12 | 2017-10-27 | 武汉钢铁(集团)公司 | Low NOxDouble ended type radiant tube burner |
| CN109253451A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | A kind of smoke backflow phase-change heat-exchange radiation pipe apparatus |
| CN109539258B (en) * | 2019-01-11 | 2023-10-10 | 佛山市科皓燃烧设备制造有限公司 | Low NOx radiant tube combustion system of adjustable flue gas reflux volume |
| CN213810620U (en) * | 2020-12-04 | 2021-07-27 | 武汉科技大学 | Radiant tube capable of realizing flameless combustion |
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