Double-gas-fuel multi-fuel combustion system

Abstract

The invention relates to the technical field of combustion furnaces, and discloses a double-gas-fuel co-combustion system which comprises a gas header pipe valve system and a gas switching system, the gas header pipe valve system comprises a first gas header pipe valve group and a second gas header pipe valve group, the first gas header pipe valve group is used for conveying first gas, and the second gas header pipe valve group is used for conveying second gas; the second fuel gas main pipe valve group is used for conveying second fuel gas; the gas inlet end of the gas switching system is connected with the gas outlet end of the first gas main pipe valve set and the gas outlet end of the second gas main pipe valve set, and the gas outlet end of the gas switching system is suitable for being connected with a combustion furnace. By integrating the first fuel gas main pipe valve group, the second fuel gas main pipe valve group and the fuel gas switching system, safe and stable supply and flexible allocation of two kinds of fuel gas are achieved, and the diversity and economical efficiency of fuel use are remarkably improved. And the overall reliability and adaptability of the system are enhanced.

Description

Technical Field

[0001] This invention relates to the field of combustion furnace technology, and more specifically to a dual-gas fuel co-firing system. Background Technology

[0002] Fuel-reversing regenerative combustion technology, as a highly efficient and energy-saving new combustion method, has been widely used in glass furnaces in recent decades. This technology utilizes regenerators on both sides of the furnace, employing refractory checker bricks as regenerators to recover over 85% of the waste heat from the flue gas, which is then used to preheat the combustion air, thus achieving efficient recycling of thermal energy and significantly reducing fuel consumption. Its basic working principle is as follows: combustion and flue gas exhaust alternate on both sides of the furnace. Combustion air on one side is heated by the regenerator before entering the melting furnace for combustion, while fuel is injected on the other side for combustion. After a certain period, the system reverses direction, allowing the functions of both sides to interchange, thereby achieving periodic and regular alternating combustion.

[0003] When using two types of fuel, two separate combustion control valve groups must be installed, resulting in high equipment investment costs, large footprint, increased system complexity, and the inability to switch and mix the two fuels in real time, which seriously restricts the flexibility and economy of glass manufacturing enterprises in fuel selection and cost control. Summary of the Invention

[0004] In view of this, the present invention provides a dual-gas fuel co-firing system to solve the problem that existing devices cannot achieve real-time switching and co-use of two fuels.

[0005] This invention provides a dual-gas fuel co-firing system, comprising:

[0006] A gas main valve system, comprising: a first gas main valve group and a second gas main valve group, wherein the first gas main valve group is used to transport a first gas and the second gas main valve group is used to transport a second gas. A gas switching system, wherein the gas inlet of the gas switching system is connected to the gas outlet of both the first gas main valve group and the second gas main valve group, and the gas outlet of the gas switching system is adapted to be connected to a combustion furnace.

[0007] Beneficial effects: By integrating the first gas main valve group, the second gas main valve group, and the gas switching system, a safe, stable supply and flexible allocation of two types of gas are achieved, significantly improving the diversity and economy of fuel use. The dual-gas fuel co-firing system can quickly switch combustion modes according to fuel supply conditions, price fluctuations, or process requirements, reducing fuel costs while minimizing redundant equipment investment and floor space, and enhancing the overall reliability and adaptability of the system.

[0008] In one optional embodiment, the first gas main valve assembly includes: The first gas main pipeline has an inlet and an outlet at both ends, and a number of shut-off valves are arranged sequentially along the first gas delivery direction. The first gas-side pipeline is connected in parallel with the first gas main pipeline.

[0009] In one optional embodiment, the second gas main valve assembly includes: The second gas main pipeline has a second gas inlet and a second gas outlet at both ends, and a number of shut-off valves are arranged sequentially along the second gas delivery direction. The second gas-side pipeline is connected in parallel with the second main gas pipeline.

[0010] In one optional implementation, the gas switching system includes: The first switching pipeline has one end connected to the gas outlet of the first main pipeline and the other end adapted to be connected to the combustion furnace. The second switching pipeline has one end connected to the gas outlet of the first main pipeline and the other end adapted to be connected to the combustion furnace. The third switching pipeline has one end connected to the air outlet of the second main pipeline and the other end adapted to be connected to the first switching pipeline. The fourth switching pipeline has one end connected to the air outlet of the second main pipeline and the other end adapted to be connected to the second switching pipeline.

[0011] Beneficial effects: With the above setup, under normal operating conditions, gas can be directly delivered via the corresponding main pipeline, or switched to the corresponding side pipeline as needed for operating conditions or maintenance. When the filter components in the main pipeline need cleaning or replacement, the shut-off valve on the corresponding pipeline section can be closed, diverting the gas to another side pipeline equipped with the filter components, achieving uninterrupted gas supply maintenance. Each shut-off valve supports segmented isolation, facilitating localized maintenance or emergency response, thereby improving the system's continuous operation capability and operational flexibility.

[0012] In one optional embodiment, the first switching pipeline, the second switching pipeline, the third switching pipeline, and the fourth switching pipeline are all equipped with pipeline shut-off valves.

[0013] Beneficial effects: When the system requires the use of the first gas independently, the first gas flows out from the outlet of the first main pipeline. At this time, only the shut-off valves on the first and second switching pipelines are opened, and the first gas is delivered directly and in parallel to the reversing valve system via these two independent paths. Simultaneously, the valves on the third and fourth switching pipelines remain closed, thus completely blocking the access of the second gas.

[0014] When the system needs to use the second gas independently, the shut-off valves on the first and second switching pipelines are closed to prevent the first gas from entering. Simultaneously, the shut-off valves on the third and fourth switching pipelines are opened. The second gas will then flow through the third and fourth switching pipelines, respectively, into the first and second switching pipelines, and ultimately be delivered to the reversing valve system via these two pipelines.

[0015] When the system requires two types of gas to be used simultaneously in different small furnaces, both types of gas are supplied at the same time. Flexible distribution can be achieved by controlling the shut-off valves on each switching pipeline. For example, if the first switching pipeline needs to supply the first type of gas and the second switching pipeline needs to supply the second type of gas, the shut-off valve on the first switching pipeline is opened to allow the first type of gas to pass through; the shut-off valve on the third switching pipeline is closed to prevent the second type of gas from flowing into the first switching pipeline; and the shut-off valve on the fourth switching pipeline is opened to allow the second type of gas to flow into the second switching pipeline.

[0016] Through specific connections of four pipelines and valve control, the system can switch between single-gas and dual-gas combustion modes, greatly enhancing the flexibility of fuel use.

[0017] In one alternative embodiment, a branch valve system is provided downstream of both the first gas main valve group and the second gas main valve group, along the gas delivery direction. The branch valve system includes several branch valve groups, and the number of branch valve groups corresponds to the number of combustion furnaces.

[0018] In one optional embodiment, the branch valve assembly includes: A branch main pipeline, one end of which is connected to the first gas main valve group or the second gas main valve group, and the other end of which is connected to the gas switching system; Branch-side pipeline, which is arranged in parallel with the main branch-side pipeline.

[0019] In one alternative implementation, a reversing valve system is provided downstream of the gas switching system along the gas delivery direction. The reversing valve system includes several sets of reversing valve groups, and the number of the reversing valve groups corresponds to the number of the combustion furnaces.

[0020] In one optional embodiment, the reversing valve assembly includes several reversing valve delivery pipelines, one end of which is connected to the gas switching system and the other end of which is connected to the corresponding spray gun on the combustion furnace.

[0021] In one optional embodiment, the combustion furnace includes a first combustion furnace and a second combustion furnace; The end of the first switching pipeline away from the gas outlet of the first main pipeline is connected to the first combustion furnace; The end of the second switching pipeline away from the gas outlet of the first main pipeline is connected to the second combustion furnace. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of a dual-gas fuel co-firing system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first gas main valve group according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the second gas main valve group according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the branch valve assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the gas switching system according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the reversing valve assembly according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. First gas main valve assembly; 11. First gas main pipeline; 12. First gas side pipeline; 13. First shut-off valve; 14. Second shut-off valve; 15. Third shut-off valve; 16. Fourth shut-off valve; 17. First filter assembly; 171. Fifth shut-off valve; 172. First filter element; 173. Sixth shut-off valve; 2. Second gas main valve assembly; 21. Second gas main pipeline; 22. Second gas side pipeline; 23. Seventh shut-off valve; 24. Eighth shut-off valve; 25. Ninth shut-off valve; 26. Tenth shut-off valve; 27. Second filter assembly; 271. Eleventh shut-off valve; 272. Second filter element; 273. Twelfth shut-off valve; 3. Gas switching system; 31. First switching pipeline; 32. Second switching pipeline; 33. Third switching pipeline; 34. Fourth switching pipeline; 35. Pipeline shut-off valve; 4. Branch valve assembly; 41. Branch main pipeline; 42. Branch side pipeline; 43. Branch shut-off valve; 44. Branch flow meter; 45. Branch flow regulating valve; 5. Reversing valve assembly; 51. Reversing valve delivery pipeline; 52. Automatic reversing valve; 53. Shut-off valve; 61. First combustion furnace; 62. Second combustion furnace. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Fuel-reversing regenerative combustion technology, as a highly efficient and energy-saving new combustion method, has been widely used in glass furnaces in recent decades. This technology utilizes regenerators on both sides of the furnace, employing refractory checker bricks as regenerators to recover over 85% of the waste heat from the flue gas, which is then used to preheat the combustion air, thus achieving efficient recycling of thermal energy and significantly reducing fuel consumption. Its basic working principle is as follows: combustion and flue gas exhaust alternate on both sides of the furnace. Combustion air on one side is heated by the regenerator before entering the melting furnace for combustion, while fuel is injected on the other side for combustion. After a certain period, the system reverses direction, allowing the functions of both sides to interchange, thereby achieving periodic and regular alternating combustion.

[0026] When using two types of fuel, two separate combustion control valve groups must be installed, resulting in high equipment investment costs, large footprint, increased system complexity, and the inability to switch and mix the two fuels in real time, which seriously restricts the flexibility and economy of glass manufacturing enterprises in fuel selection and cost control.

[0027] To solve the above technical problems, the following will be combined with... Figures 1 to 6 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, a dual-gas fuel co-firing system is provided, comprising: a gas main valve system and a gas switching system 3.

[0029] like Figure 1 As shown, the gas main valve system includes a first gas main valve group 1 and a second gas main valve group 2. The first gas main valve group 1 is used to transport the first gas, and the second gas main valve group 2 is used to transport the second gas. Along the gas transport direction, a gas switching system 3 is located downstream of the gas main valve system. Its inlet end is connected to the outlet ends of both the first and second gas main valve groups 1 and 2. The outlet end of the gas switching system 3 is suitable for connection to the combustion furnace. The gas switching system 3 is used to achieve flexible switching and mixing control between the first and second gas. Through the regulation of this system, multiple modes can be achieved, such as the combustion furnace using only the first gas, only the second gas, or simultaneously using both gas in different combustion units for mixed combustion.

[0030] During operation, the first gas main valve group 1 and the second gas main valve group 2 in the gas main valve system respectively supply the first gas and the second gas, delivering the gas to the gas switching system 3. The gas switching system 3 selects and distributes the gas according to a preset combustion mode. For example, in single-gas mode, only the corresponding gas main valve group and switching path are opened. Specifically, when the first gas needs to be supplied to the combustion furnace, the second gas main valve group 2 is closed, and the gas switching system 3 disconnects its connection with the second gas main valve group 2, supplying only the first gas to the combustion furnace. When the second gas needs to be supplied to the combustion furnace, the first gas main valve group 1 is closed, and the gas switching system 3 disconnects its connection with the first gas main valve group 1, supplying only the second gas to the combustion furnace. In dual-gas co-firing mode, both main valve groups are opened simultaneously, and the first and second gas are guided to the first combustion furnace 61 and the second combustion furnace 62 respectively through the switching system, achieving flexible fuel combination and efficient utilization.

[0031] By integrating the first gas main valve group 1, the second gas main valve group 2, and the gas switching system 3, a safe, stable supply and flexible allocation of two types of gas are achieved, significantly improving the diversity and economy of fuel use. The dual-gas fuel co-firing system can quickly switch combustion modes according to fuel supply conditions, price fluctuations, or process requirements, reducing fuel costs while minimizing redundant equipment investment and floor space, and enhancing the overall reliability and adaptability of the system.

[0032] In one embodiment, such as Figure 2As shown, the first gas main valve group 1 includes a first gas main pipeline 11 and a second gas side pipeline 22. The first gas main pipeline 11 has a first main pipeline inlet and a first main pipeline outlet at both ends for transporting first gas. Along the transport direction of the first gas, a first shut-off valve 13, a second shut-off valve 14, a third shut-off valve 15, and a fourth shut-off valve 16 are sequentially installed on the first gas main pipeline 11. These shut-off valves are used to control the gas supply and demand in stages during operation, maintenance, or emergency situations, ensuring system safety and operational flexibility. The first gas side pipeline 12 is connected in parallel with the first gas main pipeline 11, with its inlet connected to the section of the first gas main pipeline 11 downstream of the first shut-off valve 13, and its outlet connected to the section of the first gas main pipeline 11 downstream of the fourth shut-off valve 16. A first filter assembly 17 is installed on the first gas main pipeline 11 between the first shut-off valve 13 and the second shut-off valve 14, and a first filter assembly 17 is also installed on the first gas side pipeline 12. The first filter assembly 17 includes a fifth shut-off valve 171, a first filter element 172, and a sixth shut-off valve 173 arranged sequentially along the first gas delivery direction.

[0033] Under normal operating conditions, the first gas enters through the inlet of the first gas main pipeline 11. The first shut-off valve 13, the fifth shut-off valve 171, the sixth shut-off valve 173, the third shut-off valve 15, and the fourth shut-off valve 16 on the main pipeline are opened sequentially. The fifth shut-off valve 171 and the sixth shut-off valve 173 on the first gas side pipeline 12 are closed. After passing through the first filter element 172 on the first gas main pipeline 11, the first gas is discharged from the outlet of the first gas main pipeline 11. When the first filter element 172 on the first gas main pipeline 11 is damaged, the fifth shut-off valve 171 and the sixth shut-off valve 173 on the first gas main pipeline 11 can be closed, while the fifth shut-off valve 171 and the sixth shut-off valve 173 on the first gas side pipeline 12 can be opened, allowing the first gas to enter through the inlet of the first gas main pipeline 11, then through the first gas side pipeline 12, and finally discharged from the outlet of the first gas main pipeline 11.

[0034] like Figure 3As shown, the second gas main valve group 2 includes a second gas main pipeline 21 and a second gas side pipeline 22. The second gas main pipeline 21 has a second main pipeline inlet and a second main pipeline outlet at its two ends, respectively, for transporting the second gas. Along the transport direction of the second gas, a seventh shut-off valve 23, an eighth shut-off valve 24, a ninth shut-off valve 25, and a tenth shut-off valve 26 are sequentially installed on the second gas main pipeline 21. These shut-off valves are used to control the gas supply and demand in stages during operation, maintenance, or emergency situations, ensuring system safety and operational flexibility. The second gas side pipeline 22 is connected in parallel with the second gas main pipeline 21, with its inlet end connected to the section of the second gas main pipeline 21 downstream of the seventh shut-off valve 23, and its outlet end connected to the section of the second gas main pipeline 21 downstream of the tenth shut-off valve 26. A second filter assembly 27 is installed on the second gas main pipeline 21 between the seventh shut-off valve 23 and the eighth shut-off valve 24, and a second filter assembly 27 is also installed on the second gas side pipeline 22. The second filter assembly 27 includes an eleventh shut-off valve 271, a second filter element 272, and a twelfth shut-off valve 273 arranged sequentially along the second gas delivery direction.

[0035] Under normal operating conditions, the second gas enters through the inlet of the second gas main pipeline 21. The seventh shut-off valve 23, the eleventh shut-off valve 271, the twelfth shut-off valve 273, the ninth shut-off valve 25, and the tenth shut-off valve 26 on the main pipeline are opened sequentially. The eleventh shut-off valve 271 and the twelfth shut-off valve 273 on the second gas side pipeline 22 are then closed. After passing through the second filter element 272 on the second gas main pipeline 21, the second gas is discharged from the outlet of the second gas main pipeline 21. When the second filter element 272 on the second gas main pipeline 21 is damaged, the eleventh shut-off valve 271 and the twelfth shut-off valve 273 on the second gas main pipeline 21 can be shut off. The eleventh shut-off valve 271 and the twelfth shut-off valve 273 on the second gas side pipeline 22 can then be opened, allowing the second gas to enter through the inlet of the second gas main pipeline 21, then into the second gas side pipeline 22, and finally discharged from the outlet of the second gas main pipeline 21.

[0036] With the above setup, under normal operating conditions, gas can be directly delivered via the corresponding main pipeline, or switched to the corresponding side pipeline as needed for operating conditions or maintenance. When the filter components in the main pipeline need cleaning or replacement, the shut-off valve on the corresponding pipeline section can be closed to divert the gas to another side pipeline equipped with the filter components, achieving uninterrupted gas supply maintenance. Each shut-off valve supports segmented isolation, facilitating localized maintenance or emergency response, thereby improving the system's continuous operation capability and operational flexibility.

[0037] In one embodiment, such as Figure 4As shown, the dual-gas fuel co-firing system also includes a branch valve system. Along the gas delivery direction, a branch valve system is installed downstream of both the first gas main valve group 1 and the second gas main valve group 2. Each branch valve system includes several branch valve groups 4, the number of which corresponds to the number of combustion furnaces. For example, in this embodiment, there are two combustion furnaces; therefore, one branch valve system has two branch valve groups 4. Taking one branch valve group 4 installed on the first gas main valve group 1 as an example, its specific structure is described. The branch valve group 4 includes: a main branch line 41 and a side branch line 42. One end of the main branch line 41 is connected to the gas outlet of the first main line, and the other end is connected to the gas switching system 3; the side branch line 42 is arranged parallel to the main branch line 41. A branch pipe shut-off valve 43 is installed on the branch pipe side pipeline 42; multiple branch pipe shut-off valves 43 are installed along the gas transmission direction of the branch pipe main pipeline 41, and a branch pipe flow meter 44 and a branch pipe flow regulating valve 45 are also installed between the multiple branch pipe shut-off valves 43.

[0038] In one embodiment, such as Figure 5 As shown, the gas switching system 3 includes: a first switching pipeline 31, a second switching pipeline 32, a third switching pipeline 33, and a fourth switching pipeline 34.

[0039] One end of the first switching conduit 31 is connected to the air outlet of the first main pipeline, and the other end extends directly and is adapted to connect to the reversing valve system. One end of the second switching conduit 32 is also connected to the air outlet of the first main pipeline, and the other end extends directly and is adapted to connect to the reversing valve system. One end of the third switching conduit 33 is connected to the air outlet of the second main pipeline, and the other end is connected to a point on the first switching conduit 31 and communicates with it. One end of the fourth switching conduit 34 is connected to the air outlet of the second main pipeline, and the other end is connected to a point on the second switching conduit 32 and communicates with it.

[0040] A pipe-cutting valve 35 is installed on the first switching pipeline 31 located between the third switching pipeline 33 and the first gas main valve group 1. A pipe-cutting valve 35 is installed on the second switching pipeline 32 located between the fourth switching pipeline 34 and the first gas main valve group 1. A pipe-cutting valve 35 is installed on both the second switching pipeline 32 and the fourth switching pipeline 34.

[0041] When the system needs to use the first gas independently, the first gas flows out from the outlet of the first main pipeline. At this time, only the pipe shut-off valves 35 on the first switching pipeline 31 and the second switching pipeline 32 are opened, and the first gas is delivered directly and in parallel to the reversing valve system through these two independent paths. At the same time, the valves on the third switching pipeline 33 and the fourth switching pipeline 34 are kept closed, thereby completely blocking the access of the second gas.

[0042] When the system needs to use the second gas independently, the pipe shut-off valves 35 on the first switching pipeline 31 and the second switching pipeline 32 are closed to prevent the first gas from entering. Simultaneously, the pipe shut-off valves 35 on the third switching pipeline 33 and the fourth switching pipeline 34 are opened. The second gas will then flow through the third switching pipeline 33 and the fourth switching pipeline 34, respectively, into the first switching pipeline 31 and the second switching pipeline 32, and ultimately be delivered to the reversing valve system via these two pipelines.

[0043] When the system requires two types of gas to be used simultaneously in different small furnaces, both types of gas are supplied at the same time. Flexible distribution can be achieved by controlling the pipe-cutting valves 35 on each switching pipeline. For example, if the first switching pipeline 31 needs to supply the first type of gas and the second switching pipeline 32 needs to supply the second type of gas, then the pipe-cutting valve 35 on the first switching pipeline 31 is opened to allow the first type of gas to pass through; the pipe-cutting valve 35 on the third switching pipeline 33 is closed to prevent the second type of gas from flowing into the first switching pipeline 31; and the pipe-cutting valve 35 on the fourth switching pipeline 34 is opened to allow the second type of gas to flow into the second switching pipeline 32.

[0044] Through specific connections of four pipelines and valve control, the system can switch between single-gas and dual-gas combustion modes, greatly enhancing the flexibility of fuel use.

[0045] In one embodiment, such as Figure 1 and Figure 6 As shown, the reversing valve system is located downstream of the gas switching system 3. The reversing valve system includes several sets of reversing valve groups 5, the number of which corresponds to the number of combustion furnaces. The number of reversing valve groups 5 corresponds one-to-one with the number of combustion furnaces, ensuring that each combustion furnace has an independent fuel reversing control unit. For example, in this embodiment, there are two combustion furnaces: a first combustion furnace 61 and a second combustion furnace 62, and the number of reversing valve groups 5 is set to two.

[0046] Each directional valve assembly 5 contains two parallel directional valve delivery lines 51. The connection method of the two directional valve delivery lines 51 within one directional valve assembly 5 is as follows: the starting ends of both directional valve delivery lines 51 are connected to the outlet end of the first switching line 31, and the outlet ends of the two directional valve delivery lines 51 are respectively connected to the spray guns on both sides of the first combustion furnace 61. Each directional valve delivery line 51 is equipped with an automatic directional valve 52 and a shut-off valve 53.

[0047] The connection method of the two directional valve delivery pipelines 51 in another directional valve group 5 is as follows: the starting ends of both directional valve delivery pipelines 51 are connected to the gas outlet of the second switching pipeline 32, and the gas outlets of the two directional valve delivery pipelines 51 are respectively connected to the spray guns on both sides of the second combustion furnace 62. Each directional valve delivery pipeline 51 is equipped with an automatic directional valve 52 and a shut-off valve 53. The aforementioned directional valve group 5 receives the gas flow from the upstream gas switching system 3, which has completed the fuel type and path allocation, and sequentially opens the shut-off valve 53 and the directional valve on it to deliver the corresponding gas to the spray guns on both sides of the corresponding combustion furnace. The automatic directional valve 52 ensures the uniformity of the combustion rhythm of the entire furnace.

[0048] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dual-gas fuel co-firing system, characterized in that, include: A gas main valve system, comprising: a first gas main valve group (1) and a second gas main valve group (2), wherein the first gas main valve group (1) is used to transport a first gas and the second gas main valve group (2) is used to transport a second gas; The gas switching system (3) has its inlet end connected to the outlet end of the first gas main valve group (1) and the outlet end of the second gas main valve group (2). The outlet end of the gas switching system (3) is adapted to be connected to the combustion furnace.

2. The dual-gas fuel co-firing system according to claim 1, characterized in that, The first gas main valve assembly (1) includes: The first gas main pipeline (11) has a first gas pipeline inlet and a first gas pipeline outlet at both ends, and a number of shut-off valves are arranged sequentially along the first gas delivery direction. The first gas-side pipeline (12) is connected in parallel with the first gas main pipeline (11).

3. The dual-gas fuel co-firing system according to claim 2, characterized in that, The second gas main valve assembly (2) includes: The second gas main pipeline (21) has a second gas inlet and a second gas outlet at both ends, and a number of shut-off valves are arranged sequentially along the second gas delivery direction. The second gas side pipeline (22) is connected in parallel with the second gas main pipeline (21).

4. The dual-gas fuel co-firing system according to claim 3, characterized in that, The gas switching system (3) includes: The first switching pipeline (31) has one end connected to the gas outlet of the first main pipeline and the other end adapted to be connected to the combustion furnace. The second switching pipeline (32) has one end connected to the gas outlet of the first main pipeline and the other end adapted to be connected to the combustion furnace; The third switching pipeline (33) has one end connected to the outlet of the second main pipeline and the other end adapted to be connected to the first switching pipeline (31); The fourth switching pipeline (34) has one end connected to the air outlet of the second main pipeline and the other end adapted to be connected to the second switching pipeline (32).

5. The dual-gas fuel co-firing system according to claim 4, characterized in that, The first switching pipeline (31), the second switching pipeline (32), the third switching pipeline (33) and the fourth switching pipeline (34) are all equipped with pipeline shut-off valves (35).

6. The dual-gas fuel co-firing system according to claim 5, characterized in that, Along the direction of gas transmission, branch valve systems are provided downstream of both the first gas main valve group (1) and the second gas main valve group (2); The branch valve system includes several branch valve groups (4), and the number of branch valve groups (4) corresponds to the number of combustion furnaces.

7. The dual-gas fuel co-firing system according to claim 6, characterized in that, The branch valve assembly (4) includes: Branch main pipeline (41), one end of which is connected to the first gas main valve group (1) or the second gas main valve group (2), and the other end is connected to the gas switching system (3); Branch side pipeline (42) is arranged in parallel with the main branch pipeline (41).

8. The dual-gas fuel co-firing system according to claim 6, characterized in that, A reversing valve system is provided downstream of the gas switching system (3) along the gas delivery direction; The reversing valve system includes several reversing valve groups (5), and the number of reversing valve groups (5) corresponds to the number of combustion furnaces.

9. The dual-gas fuel co-firing system according to claim 8, characterized in that, The reversing valve assembly (5) includes several reversing valve delivery pipelines (51), one end of which is connected to the gas switching system (3), and the other end is connected to the corresponding spray gun on the combustion furnace.

10. The dual-gas fuel co-firing system according to claim 8, characterized in that, The combustion furnace includes a first combustion furnace (61) and a second combustion furnace (62); The end of the first switching pipeline (31) away from the gas outlet of the first main pipeline is connected to the first combustion furnace (61); The end of the second switching pipeline (32) away from the gas outlet of the first main pipeline is connected to the second combustion furnace (62).

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