CN212273986U - Gas burner for heating furnace and heating furnace thereof - Google Patents
Gas burner for heating furnace and heating furnace thereof Download PDFInfo
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- CN212273986U CN212273986U CN202021652618.3U CN202021652618U CN212273986U CN 212273986 U CN212273986 U CN 212273986U CN 202021652618 U CN202021652618 U CN 202021652618U CN 212273986 U CN212273986 U CN 212273986U
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Abstract
The utility model provides a gas burner for heating furnace and heating furnace thereof, gas burner for the heating furnace includes: the flue gas diversion burner brick comprises a combustion chamber, a secondary air through cavity, a secondary fuel gas through cavity and a flue gas backflow hole, wherein one end of the combustion chamber is communicated with an air inlet, and the other end of the combustion chamber is communicated with a combustion side; the secondary air through cavity is arranged outside the combustion chamber, one end of the secondary air through cavity is communicated with the air inlet, and the other end of the secondary air through cavity is communicated with the combustion side; the secondary gas through cavity is arranged outside the secondary air through cavity, one end of the secondary gas through cavity is communicated with the gas inlet, and the other end of the secondary gas through cavity is communicated with the combustion side; one end of the flue gas backflow hole is communicated with the secondary air through cavity, and the other end of the flue gas backflow hole is communicated with the combustion side of the flue gas diversion burner block; a plurality of primary air nozzles are arranged on the air distribution plate; one end of the primary gas spray gun is communicated with the gas inlet, and the other end of the primary gas spray gun can penetrate through the air distribution plate and is communicated with the combustion side.
Description
Technical Field
The utility model relates to a gas burner technical field, concretely relates to gas burner for heating furnace and heating furnace thereof.
Background
The steel rolling heating furnace is a large-scale household for discharging atmospheric pollutants in the current industrial furnace because of high furnace temperature and high productivity. Increasingly stringent pollutant emission standards have made the development of clean green industrial heating combustion equipment of great significance.
Usually, the design of a steel rolling heating furnace emphasizes the productivity, and the productivity is too small in practical application; or designed for heating carbon steel, but in actual use for heating alloy steel; or the composition and the heat value of the fuel gas existing on site greatly fluctuate, which deviate from the design working condition of the burner, so that the design parameters are not consistent with the site working condition. However, the commonly applied low-nitrogen combustion technology has a narrower application range compared with the conventional combustion technology, and the beyond range causes that the adaptability of the combustion equipment is difficult to satisfy, and indirectly causes that the low-nitrogen combustion technology is difficult to operate in a reasonable range.
SUMMERY OF THE UTILITY MODEL
The utility model provides a gas burner and heating furnace for heating furnace to reach the purpose that adapts to the low pollution emission demand under the situation such as load variation, calorific value fluctuation or steel grade change.
The utility model provides a technical scheme that its technical problem adopted is: a gas burner for a heating furnace, comprising: the flue gas flow guide burner block is of a cylindrical structure and comprises a combustion chamber, a secondary air through cavity, a secondary fuel gas through cavity and a flue gas backflow hole, the combustion chamber and the flue gas flow guide burner block are coaxially arranged and are communicated, one end of the combustion chamber is communicated with an air inlet, and the other end of the combustion chamber is communicated with the combustion side of the flue gas flow guide burner block; the secondary air through cavity is arranged outside the combustion chamber in parallel at intervals along the radial direction of the flue gas diversion burner block, one end of the secondary air through cavity is communicated with the air inlet, and the other end of the secondary air through cavity is communicated with the combustion side; the secondary gas through cavity is arranged outside the secondary air through cavity at intervals in parallel along the radial direction of the flue gas diversion burner block, one end of the secondary gas through cavity is communicated with a gas inlet, and the other end of the secondary gas through cavity is communicated with the combustion side; one end of the flue gas backflow hole is communicated with the secondary air through cavity, and the other end of the flue gas backflow hole is communicated with the combustion side of the flue gas diversion burner block; the air distribution plate is coaxially arranged in the combustion chamber and is provided with a plurality of primary air nozzles; the primary gas spray gun is coaxially arranged in the combustion chamber, one end of the primary gas spray gun is communicated with the gas inlet, and the other end of the primary gas spray gun can penetrate through the air distribution plate and is communicated with the combustion side.
Furthermore, the number of the secondary air through cavities is at least four, the secondary air through cavities are uniformly distributed on the outer side of the combustion chamber at intervals along the circumferential direction of the combustion chamber, and the distance between the axis of each secondary air through cavity and the axis of the combustion chamber is the same.
Furthermore, each secondary air through cavity is provided with a nozzle, and one end of the flue gas backflow hole is located between the nozzle and the combustion side.
Furthermore, the nozzle is of a cylindrical structure, the nozzle is provided with two symmetrically-arranged arc-shaped through holes, and planes corresponding to chord edges of the two arc-shaped through holes are opposite.
Furthermore, the number of the smoke return holes is multiple, and the smoke return holes are communicated with the at least four secondary air through cavities in a one-to-one correspondence mode.
Further, every flue gas backward flow hole all includes axial hole section and radial hole section, and the axis of axial hole section is parallel with the axis of flue gas water conservancy diversion burner block, and the axis of radial hole section sets up along the radial direction of flue gas water conservancy diversion burner block, and the one end of axial hole section is connected with the one end of radial hole section, and the other end and the second grade air of radial hole section link up the chamber intercommunication, and the other end and the combustion side intercommunication of axial hole section.
Furthermore, the secondary gas through cavities are at least two, the secondary gas through cavities are symmetrically arranged on the outer sides of the at least four secondary air through cavities along the circumferential direction of the combustion chamber, the distance between the axis of each secondary gas through cavity and the axis of the combustion chamber is equal, and a secondary gas spray gun is arranged in each secondary gas through cavity.
Furthermore, each secondary fuel gas through cavity is internally provided with a nozzle which is positioned at the outlet of the corresponding secondary fuel gas spray gun and is of a cylindrical structure, the nozzles are provided with two symmetrically arranged arched through holes, and planes corresponding to chord edges of the two arched through holes are opposite.
Furthermore, the gas burner for the heating furnace further comprises a second-stage gas pipe, the inlet end of the second-stage gas pipe is connected with one end of the first gas spray gun and communicated with the gas inlet, a gas switching valve is arranged at the joint of one end of the first gas spray gun and the inlet end of the second-stage gas pipe, and the outlet end of the second-stage gas pipe is communicated with the second-stage gas through cavity.
The utility model also provides a heating furnace, including gas burner, air pipeline and gas pipeline for the heating furnace, the gas burner is foretell gas burner for the heating furnace, and air pipeline and air inlet are connected, and gas pipeline and gas inlet are connected.
The beneficial effects of the utility model are that, through the venturi effect of the high-speed injection of air and gas, realize the dual inner loop of combustion air and flue gas and fuel and flue gas respectively in furnace. The inside flue gas of furnace passes through the high-speed blowout of chamber through the second grade gas and draws and penetrate and mix again, realizes the reduction of combustion temperature through reducing the fuel calorific value, reduces the formation of heating power type nitrogen oxide. Meanwhile, the smoke in the hearth is injected through the secondary air through cavity to be remixed, the mixed smoke reduces the partial pressure of oxygen and weakens the process of generating thermal nitrogen oxide by oxygen and nitrogen, so that the generation of the nitrogen oxide is reduced, and the aim of meeting the low-pollution emission requirement under the conditions of load change, heat value fluctuation or steel grade replacement and the like is fulfilled.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a view taken along line A of FIG. 1;
FIG. 3 is a view from the direction B of FIG. 1;
fig. 4 is a schematic structural diagram of a nozzle according to an embodiment of the present invention.
Reference numbers in the figures: 1. an air inlet; 2. a gas inlet; 3. a gas switching valve; 4. a secondary gas pipe; 5. a secondary air through cavity; 6. an air distribution plate; 7. a primary gas spray gun; 8. a combustion chamber; 9. a flue gas recirculation hole; 10. a flue gas diversion burner block; 11. a secondary gas through cavity; 12. and (4) a nozzle.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 to 4, the embodiment of the utility model provides a gas burner for heating furnace, including flue gas water conservancy diversion burner block 10, air distribution plate 6 and a gas spray gun 7. The flue gas flow guide burner block 10 is of a cylindrical structure, the flue gas flow guide burner block 10 comprises a combustion chamber 8, a secondary air through cavity 5, a secondary fuel gas through cavity 11 and a flue gas backflow hole 9, the combustion chamber 8 and the flue gas flow guide burner block 10 are coaxially arranged and penetrate through the flue gas flow guide burner block 10, one end of the combustion chamber 8 is communicated with an air inlet 1, and the other end of the combustion chamber 8 is communicated with the combustion side of the flue gas flow guide burner block 10; the secondary air through cavity 5 is arranged outside the combustion chamber 8 in parallel at intervals along the radial direction of the flue gas flow guide burner block 10, one end of the secondary air through cavity 5 is communicated with the air inlet 1, and the other end of the secondary air through cavity 5 is communicated with the combustion side; the secondary gas through cavity 11 is arranged outside the secondary air through cavity 5 in parallel at intervals along the radial direction of the flue gas flow guide burner block 10, one end of the secondary gas through cavity 11 is communicated with the gas inlet 2, and the other end of the secondary gas through cavity 11 is communicated with the combustion side; one end of the flue gas backflow hole 9 is communicated with the secondary air through cavity 5, and the other end of the flue gas backflow hole 9 is communicated with the combustion side of the flue gas diversion burner block 10. The air distribution plate 6 is coaxially arranged in the combustion chamber 8, and a plurality of primary air nozzles are arranged on the air distribution plate 6. The primary gas spray gun 7 is coaxially arranged in the combustion chamber 8, one end of the primary gas spray gun 7 is communicated with the gas inlet 2, and the other end of the primary gas spray gun 7 can penetrate through the air distribution plate 6 and is communicated with the combustion side.
Through the Venturi effect of high-speed injection of air and fuel gas, dual internal circulation of combustion air, flue gas and fuel and flue gas is respectively realized in the hearth. The inside flue gas of furnace passes through 11 high-speed ejections of chamber through the second grade gas and draws and penetrate and mix again, realizes the reduction of combustion temperature through reducing the fuel calorific value, reduces the formation of heating power type nitrogen oxide. Meanwhile, the smoke in the hearth is injected and injected through the secondary air through cavity 5 to be remixed, the mixed smoke reduces the partial pressure of oxygen and weakens the process of generating thermal nitrogen oxide by oxygen and nitrogen, so that the generation of the nitrogen oxide is reduced, and the aim of meeting the low-pollution emission requirement under the conditions of load change, heat value fluctuation or steel grade replacement and the like is fulfilled.
It should be noted that the primary air nozzles arranged on the air distributor 6 adopt a high-speed inclined hole structure to replace the traditional swirl plate structure, so that the defect that flame floats upwards under the deviation standard working conditions of low load, coal gas heat value, steel grade change and the like can be effectively overcome, and the stability of flame rigidity is ensured.
In this embodiment, the primary gas spray gun 7, the air distribution plate 6 and the combustion chamber 8 form a primary combustion area, the proportion of the primary gas is less than 20%, and the proportion of the primary air is less than 30%. Lean fuel combustion with good mixing is formed by the included angle between primary air and primary gas, combustion products are sprayed at high speed to facilitate flue gas backflow, so that the whole burner is stabilized in flame, and a primary combustion area is in a lean combustion state and is not easy to generate nitrogen oxides.
In the embodiment, the number of the secondary air through cavities 5 is at least four, the secondary air through cavities are uniformly distributed on the outer side of the combustion chamber 8 at intervals along the circumferential direction of the combustion chamber 8, and the distance between the axis of each secondary air through cavity 5 and the axis of the combustion chamber 8 is the same. As shown in fig. 3, the number of the secondary air through cavities 5 is six, the connecting lines of the end points of the axes of the six secondary air through cavities 5 are circles with a diameter larger than the outer diameter of the combustion chamber 8, and the six secondary air through cavities 5 are uniformly distributed on the circumference of the circle at intervals.
Specifically, the secondary air through cavities 5 are distributed in a ring-shaped or fan-shaped array along the circumferential direction, the number of the secondary air through cavities 5 is at least more than 4, the secondary air through cavities are uniformly arranged in an axisymmetric manner, and the nozzle flow rate of the secondary air through cavities 5 is 40-60 m/s. The secondary air sprayed into the flue gas diversion burner block 10 through the plurality of high-speed nozzles penetrates through the cavity 5, and a part of flue gas enters the backflow holes from the hearth under the action of the injection negative pressure, so that the concentration of oxygen entering a combustion area of the hearth is diluted, the intensity of combustion reaction is reduced, and the generation of nitrogen oxides at high temperature is inhibited.
Further, a nozzle 12 is arranged in each secondary air through cavity 5, and one end of the flue gas backflow hole 9 is located between the nozzle 12 and the combustion side. Each nozzle 12 is a cylindrical structure, the nozzle 12 is provided with two symmetrically arranged arc-shaped through holes, and planes corresponding to chord edges of the two arc-shaped through holes are opposite.
As shown in fig. 4, the nozzles 12 are double-crescent nozzles, and are combined with the secondary air through cavity 5 of the flue gas diversion burner block 10, so that large flue gas backflow can be realized and a good flue gas and air gas premixing effect can be generated under the working conditions deviating from the standard, such as low load, gas heat value, steel grade change and the like, and thus the working range of low-nitrogen combustion is expanded, and a stable low-nitrogen combustion effect is realized in a large adjustment range.
The number of the flue gas return holes 9 is multiple, and the plurality of flue gas return holes 9 are communicated with the at least four secondary air through cavities 5 in a one-to-one correspondence manner.
Specifically, as shown in fig. 1, each flue gas recirculation hole 9 includes an axial hole section and a radial hole section, the axis of the axial hole section is parallel to the axis of the flue gas diversion burner block 10, the axis of the radial hole section is arranged along the radial direction of the flue gas diversion burner block 10, one end of the axial hole section is connected with one end of the radial hole section, the other end of the radial hole section is communicated with the secondary air through cavity 5, and the other end of the axial hole section is communicated with the combustion side. The smoke gas reflux holes 9 are arranged to facilitate the reflux of high-temperature smoke gas and the intensive mixing with air gas to form a uniform mixture with a concentration field, so that the stable flameless combustion of high-temperature low-oxygen low-heating-value fuel is realized in the hearth space.
As shown in fig. 3, at least two secondary gas through cavities 11 are symmetrically arranged outside the at least four secondary air through cavities 5 along the circumferential direction of the combustion chamber 8, and the distance between the axis of each secondary gas through cavity 11 and the axis of the combustion chamber 8 is the same.
And secondary gas spray guns are arranged in the secondary gas through cavity 11 to spray gas at a high speed, and the number of the secondary gas spray guns is at least 2 and corresponds to the number of the secondary gas through cavities 11 one by one. The flow velocity of the nozzle of the secondary gas spray gun is 80-200 m/s, and the high-speed gas is sprayed into the secondary gas through cavity 11 of the flue gas diversion burner block 10, so that the heat value of the gas entering a combustion area of a hearth is greatly reduced under the action of a large amount of backflow flue gas, a high-temperature peak value generated when high-heat-value fuel is combusted is avoided, and the generation of thermal nitrogen oxide is reduced.
The embodiment of the utility model provides an in heating furnace is with gas burner still includes second grade gas pipe 4, the entry end with once gas spray gun 7 one end be connected and with 2 intercommunications of gas entry, and be provided with gas diverter valve 3 in the one end of once gas spray gun 7 and the entry end junction of second grade gas pipe 4, the exit end and the second grade gas of second grade gas pipe 4 link up the secondary gas spray gun intercommunication in the chamber 11.
And a nozzle 12 is arranged in each secondary fuel gas through cavity 11, and the nozzle 12 is positioned at the outlet of the secondary fuel gas spray gun. The nozzle 12 is a cylindrical structure, the nozzle 12 is provided with two symmetrically arranged arc-shaped through holes, and planes corresponding to chord edges of the two arc-shaped through holes are opposite. The nozzles 12 are identical in structure and adopt a double crescent shape, and a negative pressure region is formed in a hollow region of the double crescent shape, so that high-temperature flue gas can flow back and is strongly mixed with air gas to form a uniform mixture of a concentration field, and stable flameless combustion of high-temperature low-oxygen low-heat-value fuel can be realized in a hearth space.
Use the embodiment of the utility model provides a during operation: the air passes through the air distribution plate 6 from one part of the air inlet 1 and then is mixed and combusted with the gas sprayed by the primary gas spray gun 7 in the combustion chamber 8, the generated high-speed flue gas has a flame stabilizing effect and quickly enters the hearth space to absorb the flue gas in the furnace, so that the nitrogen oxide in the primary combustion is reduced, and the other part of the air is sprayed out from the secondary air through cavity 5 and then is mixed and diluted with the flue gas entering from the flue gas reflux hole 9 and then enters the hearth space. The gas enters from the gas inlet 2, after the proportion of the primary gas and the secondary gas is adjusted by the gas switching valve 3, one part of the gas enters the combustion chamber from the primary gas spray gun 7, and the other part of the gas is sprayed out from the secondary gas through cavity 11 through the secondary gas pipe 4 respectively, and then is mixed and diluted with the gas entering from the gas reflux hole 9 and enters the hearth space. The secondary gas and the secondary air are sprayed out from the nozzle 12, and after the secondary gas and the secondary air are subjected to double strengthening injection dilution by the flue gas diversion burner block 10 and the backflow flue gas, the heat value of the gas is reduced, the oxygen partial pressure of the air is also reduced, the mixed combustion reaction strength in the hearth space is reduced, the combustion temperature is uniform, and low-pollution flameless combustion can be realized.
The embodiment of the utility model provides a heating furnace is including gas burner, air pipeline and gas pipeline for the heating furnace, and gas burner for the heating furnace is foretell gas burner for the heating furnace, and air pipeline is connected with air inlet 1, and the gas pipeline is connected with gas inlet 2.
It should be noted that, in the present embodiment, the heating furnace adopts time-series pulse combustion control to perform heat supply regulation.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the utility model discloses need not to adopt extra flue gas circulating fan and other pipeline equipment, can realize stabilizing low pollution combustion, avoid in the actual industrial furnace kiln because the low nitrogen that changes such as load, gas calorific value, steel variety lead to greatly burns situations such as unstability.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and the technical scheme, all can the independent assortment use between technical scheme and the technical scheme.
Claims (10)
1. A gas burner for a heating furnace, comprising:
the flue gas diversion burner block (10) is of a cylindrical structure, the flue gas diversion burner block (10) comprises a combustion chamber (8), a secondary air through cavity (5), a secondary fuel gas through cavity (11) and a flue gas backflow hole (9), the combustion chamber (8) and the flue gas diversion burner block (10) are coaxially arranged and penetrate through the flue gas diversion burner block (10), one end of the combustion chamber (8) is communicated with an air inlet (1), and the other end of the combustion chamber (8) is communicated with the combustion side of the flue gas diversion burner block (10); the secondary air through cavity (5) is arranged on the outer side of the combustion chamber (8) in parallel at intervals along the radial direction of the flue gas flow guide burner block (10), one end of the secondary air through cavity (5) is communicated with the air inlet (1), and the other end of the secondary air through cavity (5) is communicated with the combustion side; the secondary gas through cavity (11) is arranged outside the secondary air through cavity (5) in parallel at intervals along the radial direction of the flue gas diversion burner block (10), one end of the secondary gas through cavity (11) is communicated with the gas inlet (2), and the other end of the secondary gas through cavity (11) is communicated with the combustion side; one end of a flue gas backflow hole (9) is communicated with the secondary air through cavity (5), and the other end of the flue gas backflow hole (9) is communicated with the combustion side of the flue gas diversion burner block (10);
the air distribution plate (6) is coaxially arranged in the combustion chamber (8), and a plurality of primary air nozzles are arranged on the air distribution plate (6);
the primary gas spray gun (7) is coaxially arranged in the combustion chamber (8), one end of the primary gas spray gun (7) is communicated with the gas inlet (2), and the other end of the primary gas spray gun (7) can penetrate through the air distribution plate (6) and is communicated with the combustion side.
2. The gas burner for a heating furnace according to claim 1, wherein the number of the secondary air through cavities (5) is at least four, and the secondary air through cavities are uniformly distributed outside the combustion chamber (8) at intervals in the circumferential direction of the combustion chamber (8), and the distance between the axis of each secondary air through cavity (5) and the axis of the combustion chamber (8) is the same.
3. The gas burner for a heating furnace according to claim 2, wherein a nozzle (12) is provided in each of said secondary air through cavities (5), and one end of said flue gas recirculation hole (9) is located between said nozzle (12) and said combustion side.
4. The gas burner for the heating furnace according to claim 3, wherein the nozzle (12) has a cylindrical structure, the nozzle (12) is provided with two symmetrically arranged arc-shaped through holes, and planes corresponding to chord edges of the two arc-shaped through holes are opposite.
5. The gas burner for the heating furnace according to claim 2, wherein the number of the flue gas recirculation holes (9) is plural, and the plural flue gas recirculation holes (9) are in one-to-one correspondence communication with at least four of the secondary air through cavities (5).
6. The gas burner for the heating furnace as claimed in claim 5, wherein each of the flue gas recirculation holes (9) comprises an axial hole section and a radial hole section, the axis of the axial hole section is parallel to the axis of the flue gas diversion burner block (10), the axis of the radial hole section is arranged along the radial direction of the flue gas diversion burner block (10), one end of the axial hole section is connected with one end of the radial hole section, the other end of the radial hole section is communicated with the secondary air through cavity (5), and the other end of the axial hole section is communicated with the combustion side.
7. The gas burner for the heating furnace according to claim 2, wherein the number of the secondary gas through cavities (11) is at least two, the secondary gas through cavities are symmetrically arranged on the outer sides of at least four secondary air through cavities (5) along the circumferential direction of the combustion chamber (8), the distance between the axis of each secondary gas through cavity (11) and the axis of the combustion chamber (8) is the same, and a secondary gas spray gun is arranged in each secondary gas through cavity (11).
8. The gas burner for the heating furnace according to claim 7, wherein each secondary gas through cavity (11) is provided with a nozzle (12), the nozzle (12) is located at the outlet of the corresponding secondary gas spray gun, the nozzle (12) is of a cylindrical structure, the nozzle (12) is provided with two symmetrically arranged arc-shaped through holes, and planes corresponding to chord edges of the two arc-shaped through holes are opposite.
9. The gas burner for the heating furnace as claimed in claim 7, further comprising a secondary gas pipe (4), wherein an inlet end of the secondary gas pipe is connected to one end of the primary gas spray gun (7) and communicated with the gas inlet (2), a gas switching valve (3) is arranged at a connection position of one end of the primary gas spray gun (7) and the inlet end of the secondary gas pipe (4), and an outlet end of the secondary gas pipe (4) is communicated with the secondary gas spray gun.
10. A heating furnace comprising a gas burner for a heating furnace, an air line and a gas line, characterized in that the gas burner for a heating furnace is the gas burner for a heating furnace of any one of claims 1 to 9, the air line is connected to the air inlet (1), and the gas line is connected to the gas inlet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021652618.3U CN212273986U (en) | 2020-08-11 | 2020-08-11 | Gas burner for heating furnace and heating furnace thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021652618.3U CN212273986U (en) | 2020-08-11 | 2020-08-11 | Gas burner for heating furnace and heating furnace thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212273986U true CN212273986U (en) | 2021-01-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021652618.3U Active CN212273986U (en) | 2020-08-11 | 2020-08-11 | Gas burner for heating furnace and heating furnace thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212273986U (en) |
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2020
- 2020-08-11 CN CN202021652618.3U patent/CN212273986U/en active Active
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