Oxygen-enriched combustion-supporting gas supply device

Abstract

The utility model relates to an oxygen-enriched combustion-supporting gas supply device which comprises an air delivery pipe and a nitrogen delivery header pipe, a first mixer is arranged on the air delivery pipe, an oxygen delivery pipe is arranged on the first mixer, two flame-retardant delivery devices are communicated with the first mixer, and the two flame-retardant delivery devices are connected in parallel. Each flame-retardant conveying device comprises a first conveying pipe, a first stop valve, a first flame arrester and a first adjusting valve, the first conveying pipe between each first stop valve and the corresponding first flame arrester is communicated with the nitrogen conveying header pipe through a second conveying pipe, and each second conveying pipe is provided with a second stop valve; the first conveying pipes between the first flame arresters and the first adjusting valves in the two flame-retardant conveying devices are communicated through a third conveying pipe, and a second adjusting valve is arranged on the third conveying pipe. And the preparation time for safely using the combustion-supporting gas supply system again is shortened. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to a supply device for oxygen-enriched combustion-supporting gas, in particular to a supply device for oxygen-enriched combustion-supporting gas. Background Art

[0002] In modern blast furnace production, oxygen-enriched blasting can effectively exert the combustion-supporting properties of oxygen. The increase in oxygen concentration can make the fuel in the furnace burn more fully, with higher thermal efficiency and improve the smelting intensity of the blast furnace; at the same time, oxygen-enriched blasting can also increase the temperature of the blast furnace tuyere, perform heat compensation on the blast furnace, and create conditions for increasing the amount of coal injection in the blast furnace. Oxygen-enriched blasting can increase production, mainly because the heat brought into the blast is reduced due to the reduction in air volume, but at the same time, the volume of coal gas generated by unit carbon combustion is reduced. The reduction in the amount of coal gas will reduce its resistance to the descent of the charge, increase the coke combustion rate, and shorten the residence time of the charge in the furnace. The amount of injected fuel can be further increased, thereby shortening the smelting journey and increasing production. However, it is not the case that continuously increasing the amount of coal injection and increasing the oxygen content of the combustion-supporting gas will be more beneficial to production. This is mainly because the temperature in the steel smelting process should be maintained in an appropriate range, and when the oxygen content of the combustion-supporting gas increases, it will also bring danger. According to the technical content disclosed by relevant domestic institutions, when the oxygen content of the combustion-supporting gas is between 25% and 30%, the combustion performance of the materials used by the general blower is almost the same as the combustion performance of the materials in the atmosphere. Therefore, when using the blower as a power to drive the combustion-supporting gas, the more reasonable range of the oxygen content of the combustion-supporting gas should be 25% to 30%, which is mainly to avoid the corresponding equipment being more likely to burn under oxygen-rich conditions, thereby bringing uncertain use risks.

[0003] In order to protect the blower in the existing process, a flame arrester is added downstream of the blower to prevent the blower from being burned by flames from the hot blast furnace or blast furnace that enter the combustion gas transmission pipeline in unexpected circumstances, thereby reducing the technical problem of the blower being burned. Although the addition of a flame arrester can solve the above problems, it also brings additional problems. Once an unexpected situation occurs, the flame enters the combustion gas pipeline. After the corresponding flame arrester acts, after the danger of the downstream supporting system is eliminated, the combustion gas cannot be supplied in time for safety reasons. This is mainly because the flame arrester must be disassembled for maintenance and is considered reliable after corresponding testing, and can continue to be connected to the combustion gas supply system for use. Therefore, there is room for improvement in the existing technology, so as to ensure the safe use requirements of the flame arrester and realize the timely supply of combustion gas after the danger of the downstream supporting system is eliminated, thereby reducing the impact of abnormal working conditions on the enterprise. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides an oxygen-enriched combustion gas supply device which can shorten the preparation time for the combustion gas supply system to be safely used again after an abnormal flame in the downstream supporting system penetrates into the combustion gas pipeline and is blocked by a flame arrester, thereby overcoming the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a supply device for oxygen-enriched combustion gas, comprising an air delivery pipe and a nitrogen delivery main pipe, a first mixer is arranged on the outlet end of the air delivery pipe, an oxygen delivery pipe is arranged on the first mixer, a flame retardant delivery device is connected to the first mixer, two flame retardant delivery devices are adopted, the two flame retardant delivery devices are connected in parallel with each other, each of the flame retardant delivery devices comprises a first delivery pipe and a first stop valve, a first flame arrester and a first regulating valve which are arranged in sequence along the direction from close to the first mixer to far away from the first mixer on the first delivery pipe, the first delivery pipe between each first stop valve and the first flame arrester and the nitrogen delivery main pipe are respectively connected through a second delivery pipe, each second delivery pipe is provided with a second stop valve, the first delivery pipe between the first flame arrester and the first regulating valve in the two flame retardant delivery devices is connected through a third delivery pipe, and a second regulating valve is arranged on the third delivery pipe.

[0006] Preferably, the first mixer is provided with an inlet end of a first combustion-supporting gas delivery pipe, the first combustion-supporting gas delivery pipe is provided with a first online chromatograph and a first gas flow meter, the outlet end of the first combustion-supporting gas delivery pipe is provided with a second mixer, the second mixer is provided with an inlet end of a second combustion-supporting gas delivery pipe and an outlet end of a first nitrogen delivery branch pipe, the inlet ends of the first delivery pipes in the two flame-retardant delivery devices are both connected to the outlet end of the second combustion-supporting gas delivery pipe, the inlet end of the first nitrogen delivery branch pipe is connected to the nitrogen delivery main pipe, and the second combustion-supporting gas delivery pipe is provided with a relay fan and a second online chromatograph.

[0007] Preferably, the second mixer and the first mixer both include a tank body, an air guide pipe and an air guide cone sequentially arranged on the tank body along the direction from the inlet end to the outlet end of the tank body, and a spiral blade arranged between the air guide cone and the tank body, the outlet end of the air guide pipe is located in the inner cavity of the tank body, the central axis of the air guide cone, the central axis of the inner cavity of the tank body and the central axis of the air guide cone are located on the same axis, the number of spiral blades is several, and the several spiral blades are evenly distributed in a star shape on the outside of the air guide cone, the outlet end of the oxygen delivery pipe is connected to the inlet end of the air guide pipe of the first mixer, and the inlet end of the air guide pipe of the second mixer is connected to the outlet end of the first nitrogen delivery branch pipe.

[0008] Preferably, the oxygen delivery pipe and the nitrogen delivery main pipe are respectively and sequentially provided with a booster unit, a heat exchanger, a first temperature sensor, a buffer tank and a first filter along the distance from the flame retardant delivery device to the distance close to the flame retardant delivery device. A pressure sensor and a pressure relief valve are provided on the top of the buffer tank, and a drain pipe is provided on the bottom end of the buffer tank, and a third stop valve is provided on the drain pipe.

[0009] Preferably, the oxygen delivery pipe between the first filter installed on the oxygen delivery pipe and the first mixer is provided with a third regulating valve, a second gas flow sensor and a second flame arrester in sequence along the direction away from the first mixer to close to the first mixer, the two second delivery pipes and the nitrogen delivery main pipe are connected through the second nitrogen delivery branch pipe, the inlet end of the first nitrogen delivery branch pipe and the inlet end of the second nitrogen delivery branch pipe are both connected to the outlet end of the nitrogen delivery main pipe, and the first nitrogen delivery branch pipe is provided with a fourth regulating valve and a third gas flow sensor.

[0010] Preferably, each of the flame retardant delivery devices further comprises a second temperature sensor disposed on the first delivery pipe between the first flame arrester and the first regulating valve.

[0011] Preferably, the outlet end of the air delivery pipe is connected to the inlet end of the tank body of the first mixer, and the air delivery pipe is sequentially provided with a fourth gas flow sensor, a fifth regulating valve, an air fan and a second filter along the direction from close to the first mixer to away from the first mixer.

[0012] The beneficial effects of the utility model are:

[0013] Firstly, after an abnormal flame in the downstream supporting system penetrates into the flame arrester of the combustion gas pipeline to block the flame, the utility model can reduce the problem of the first flame arrester in use by jointly delivering nitrogen through the second delivery pipe and the third delivery pipe, and at the same time reduce the temperature of the first delivery pipes on both sides of the first flame arrester in use, and can suppress the flame already existing in the first delivery pipe by the delivered nitrogen, and can continuously deliver nitrogen through the first delivery pipe in the standby state to prevent the flame from penetrating into the first delivery pipe in the standby state, and finally deliver nitrogen to the downstream users in danger through the first delivery pipe in the standby state and the first delivery pipe in use, so as to suppress the trend of continuous combustion of the downstream users; and after the danger of the downstream users is overcome, the flame-retardant delivery device in the standby state can be used to connect to the second combustion gas delivery pipe to continuously deliver combustion gas to the downstream users again, thereby shortening the preparation time for the combustion gas supply system to be safely used again.

[0014] Secondly, the air delivery pipe of the utility model is provided with a fourth gas flow sensor, a fifth regulating valve, an air fan and a second filter in sequence along the direction from close to the first mixer to away from the first mixer. The fifth regulating valve is installed to facilitate adjustment of the gas delivery amount through the air delivery pipe, and the fourth gas flow sensor is installed to facilitate feedback of the flow parameters of the air flow delivered through the air delivery pipe.

[0015] Finally, the oxygen delivery pipe and the nitrogen delivery main pipe described in the utility model are respectively provided with a booster unit, a heat exchanger, a first temperature sensor, a buffer tank and a first filter in sequence from away from the flame retardant delivery device to close to the flame retardant delivery device. The buffer tank is installed to facilitate buffering of the corresponding airflow.

[0016] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A. DETAILED DESCRIPTION

[0019] like Figure 1 and Figure 2 As shown, a supply device for oxygen-enriched combustion-supporting gas comprises an air delivery pipe 1 and a nitrogen delivery main pipe 2, a first mixer is arranged on the outlet end of the air delivery pipe 1, an oxygen delivery pipe 3 is arranged on the first mixer, a flame retardant delivery device is connected to the first mixer, two flame retardant delivery devices are adopted, the two flame retardant delivery devices are connected in parallel with each other, each of the flame retardant delivery devices comprises a first delivery pipe 4 and a first stop valve 5, a first flame arrester 6 and a first regulating valve 7 which are arranged in sequence along the direction from close to the first mixer to away from the first mixer on the first delivery pipe 4, each first stop valve 5 and the first flame arrester 6 are connected to the first flame arrester 7, and the flame retardant delivery device is connected to the first mixer 7. The first delivery pipe 4 between 6 and the nitrogen delivery main pipe 2 are respectively connected through the second delivery pipe 8, and each second delivery pipe 8 is provided with a second stop valve 9. The first delivery pipe 4 between the first flame arrester 6 and the first regulating valve 7 in the two flame retardant delivery devices is connected through a third delivery pipe 10, and the third delivery pipe 10 is provided with a second regulating valve 11. The air delivery pipe 1 is sequentially provided with a fourth gas flow sensor 39, a fifth regulating valve 40, an air fan 41 and a second filter 42 along the direction from close to the first mixer to away from the first mixer, and the second filter 42 adopts a self-cleaning air filter.

[0020] Due to the different sources of oxygen supply, especially the temperature of oxygen supplied by the cryogenic distillation equipment is lower than the temperature of air delivered by the air delivery pipe 1. After the air delivered by the air delivery pipe 1 and the oxygen delivered by the oxygen delivery pipe 3 are mixed, the oxygen delivered by the oxygen delivery pipe 3 has a lower temperature and will expand in volume after mixing. This results in a higher oxygen content in the combustion-supporting gas after mixing in the first mixer. Therefore, the product also includes an inlet end of a first combustion-supporting gas delivery pipe 12 provided on the first mixer, and a The first online chromatograph 13 and the first gas flowmeter 14, the outlet end of the first combustion-supporting gas delivery pipe 12 is provided with a second mixer, the inlet end of the second combustion-supporting gas delivery pipe 15 and the outlet end of the first nitrogen delivery branch pipe 16 are provided on the second mixer, the inlet ends of the first delivery pipes 4 in the two flame retardant delivery devices are both connected to the outlet end of the second combustion-supporting gas delivery pipe 15, the inlet end of the first nitrogen delivery branch pipe 16 is connected to the nitrogen delivery main pipe 2, and the second combustion-supporting gas delivery pipe 15 is provided with a relay fan 17 and a second online chromatograph 18. After the gas flow mixed by the first mixer is fed back with component parameters by the first online chromatograph 13 and flow parameters by the first gas flowmeter 14, nitrogen is delivered to the second mixer through the first nitrogen delivery branch pipe 16 according to the component parameters fed back by the first online chromatograph 13 and the flow parameters fed back by the first gas flowmeter 14, so as to adjust the oxygen content of the combustion-supporting gas to the preset range again by the second mixer and feed it back through the second online chromatograph 18.

[0021] Furthermore, the oxygen delivery pipe 3 and the nitrogen delivery main pipe 2 are respectively provided with a booster unit 23, a heat exchanger 24, a first temperature sensor 25, a buffer tank 26 and a first filter 27 in sequence from away from the flame retardant delivery device to close to the flame retardant delivery device, a pressure sensor 28 and a pressure relief valve 29 are provided on the top of the buffer tank 26, a drain pipe 30 is provided on the bottom of the buffer tank 26, and a third stop valve 31 is provided on the drain pipe 30. The installation of the heat exchanger 24 facilitates heat exchange of the airflow pressurized by the booster unit 23, so that the corresponding airflow is in a suitable temperature range and is fed back through the corresponding first temperature sensor 25.

[0022] Furthermore, the oxygen delivery pipe 3 between the first filter 27 installed on the oxygen delivery pipe 3 and the first mixer is provided with a third regulating valve 32, a second gas flow sensor 33 and a second flame arrester 34 in sequence along the direction away from the first mixer to the direction close to the first mixer. The third regulating valve 32 is installed to facilitate the adjustment of the flow of oxygen delivered through the oxygen delivery pipe 3, and the second gas flow sensor 33 is installed to facilitate the feedback of the flow of oxygen delivered through the oxygen delivery pipe 3; the two second delivery pipes 8 and the nitrogen delivery main pipe 2 are connected through the second nitrogen delivery branch pipe 35, the inlet end of the first nitrogen delivery branch pipe 16 and the inlet end of the second nitrogen delivery branch pipe 35 are both connected to the outlet end of the nitrogen delivery main pipe 2, and the first nitrogen delivery branch pipe 16 is provided with a fourth regulating valve 36 and a third gas flow sensor 37. The fourth regulating valve 36 is installed to facilitate the feedback of the flow of nitrogen delivered through the first nitrogen delivery branch pipe 16, and the third gas flow sensor 37 is installed to facilitate the feedback of the flow parameters of nitrogen delivered through the first nitrogen delivery branch pipe 16.

[0023] The second mixer and the first mixer both include a tank body 19, an air guide pipe 20 and an air guide cone 21 sequentially arranged on the tank body 19 along the direction from the inlet end of the tank body 19 to the outlet end of the tank body 19, and a spiral blade 22 arranged between the air guide cone 21 and the tank body 19. The outlet end of the air guide pipe 20 is located in the inner cavity of the tank body 19, the central axis of the air guide cone 21, the central axis of the inner cavity of the tank body 19 and the central axis of the air guide cone 21 are located on the same axis, the number of spiral blades 22 is several, and the several spiral blades 22 are evenly distributed in a star shape on the outside of the air guide cone 21, the outlet end of the oxygen delivery pipe 3 is connected to the inlet end of the air guide pipe 20 of the first mixer, and the inlet end of the air guide pipe 20 of the second mixer is connected to the outlet end of the first nitrogen delivery branch pipe 16. The outlet end of the tank body 19 of the first mixer is connected to the inlet end of the first combustion-supporting gas delivery pipe 12, the outlet end of the first combustion-supporting gas delivery pipe 12 is connected to the inlet end of the tank body 19 of the second mixer, the outlet end of the tank body 19 of the second mixer is connected to the inlet end of the second combustion-supporting gas delivery pipe 15, and the outlet end of the air delivery pipe 1 is connected to the inlet end of the tank body 19 of the first mixer.

[0024] Each of the flame retardant conveying devices further includes a second temperature sensor 38 disposed on the first conveying pipe 4 between the first flame arrester 6 and the first regulating valve 7. The second temperature sensor 38 is installed to facilitate feedback of the temperature parameters of the corresponding first conveying pipe 4, so as to judge whether the first conveying pipe 4 is in a safe conveying state according to the temperature parameters fed back by the second temperature sensor 38.

[0025] The usage of this product is as follows: Figure 1 and Figure 2 As shown, the following steps are included:

[0026] S1. The air in the external atmosphere is filtered by the second filter 42 and then enters the air delivery pipe 1. Then, after the flow parameters are fed back by the fourth gas flow sensor 39, it is sent into the inner cavity of the tank body 19 of the first mixer and the oxygen delivered through the oxygen delivery pipe 3 is mixed with the gas guide cone 21 of the first mixer and the spiral blades 22 of the first mixer to form a first combustion-supporting gas. Then, it is sent into the first combustion-supporting gas delivery pipe 12, and after the component parameters are fed back by the first online chromatograph 13 and the flow parameters are fed back by the first gas flow meter 14, it is sent into the inner cavity of the tank body 19 of the second mixer.

[0027] S2, nitrogen is transported through the nitrogen transport main pipe 2 and the first nitrogen transport branch pipe 16 and enters the inner cavity of the tank body 19 of the second mixer through the air guide pipe 20 of the second mixer. The nitrogen is mixed with the first combustion-supporting gas entering the inner cavity of the tank body 19 of the second mixer in the air guide cone 21 of the second mixer and the spiral blades 22 of the second mixer to form a second combustion-supporting gas, and then driven again by the relay fan 17 and transported to the combustion-supporting gas user through the flame retardant transport device in use.

[0028] S3. When the second temperature sensor 38 in the flame retardant conveying device in use is continuously at an abnormally high temperature, notify the on-site staff to verify. When it is confirmed that the downstream user has caused a dangerous situation due to excessive combustion, causing the flame to enter the first conveying pipe 4 in the flame retardant conveying device in use, in order to prevent the flame from further spreading and causing greater harm, it is necessary to close the first stop valve 5 in the flame retardant conveying device in use to block the continued delivery of the combustion-supporting gas, and at the same time open the second stop valve 9 of the second conveying pipe 8 connected to the flame retardant conveying device in use and open the The second stop valve 9 of the second delivery pipe 8 connected to the flame retardant delivery device in the standby state, and the opening of the second regulating valve 11, the opening of the first regulating valve 7 in the flame retardant delivery device in the use state and the opening of the first regulating valve 7 in the flame retardant delivery device in the standby state are reasonably adjusted. At this time, the nitrogen delivered by the nitrogen delivery main pipe 2 is first divided into two parts, namely the first part of nitrogen and the second part of nitrogen. The first part of nitrogen passes through the first flame arrester 6 in the flame retardant delivery device in the use state close to one end of the relay fan 17, so that the first flame arrester in the flame retardant delivery device in the use state The first delivery pipe 4 on the side close to the relay fan 17 continuously has inert gas input for cooling and flame retardant gas, so that the first flame arrester 6 in the flame retardant delivery device in use is always within the normal working temperature range, avoiding the first flame arrester 6 in the flame retardant delivery device in use from losing its function due to exceeding the normal working temperature range; the second part of nitrogen is divided into two parts again after passing through the first flame arrester 6 in the flame retardant delivery device in standby state, namely the third part of nitrogen and the fourth part of nitrogen, and the third part of nitrogen is then sent to the flame retardant delivery device in standby state through the third delivery pipe 10. The first flame arrester 6 in the flame retardant delivery device in use is close to the first delivery pipe 4 on the downstream user side and then delivered to the downstream user, so that nitrogen is continuously delivered into the first delivery pipe 4 where there is already a flame to cool it down and the corresponding first delivery pipe 4 is cooled so that the temperature of the first flame arrester 6 is further reduced and delivered to the downstream user through the outlet end of the first delivery pipe 4 in use, thereby suppressing the downstream user's tendency to continue burning. The fourth part of nitrogen is directly delivered to the downstream user through the outlet end of the first delivery pipe 4 in standby state, thereby suppressing the downstream user's tendency to continue burning.

[0029] S4. When the danger of the downstream user has been fully overcome, the first flame arrester 6 that was originally in use is disassembled, and the downstream user continues to perform maintenance and is ready to start the car again, if the first flame arrester 6 that was originally in use has not completed the maintenance and inspection process, the flame retardant conveying device that is in the standby state is connected to the second combustion-supporting gas conveying pipe 15, and the flame retardant conveying device that was originally in the standby state is converted to a flame retardant conveying device that is in use; when the first flame arrester 6 that was originally in use has completed the inspection and inspection and can be used again, the first flame arrester 6 that was originally in use and has completed the inspection and inspection will be reinstalled, and the flame retardant conveying device that was originally in use is converted to a flame retardant conveying device that is in the standby state.

[0030] Through this embodiment, after an abnormal flame appears in the downstream supporting system and enters the flame arrester of the combustion-supporting gas pipeline to block the flame, nitrogen can be delivered to the first delivery pipe 4 in use state through the second delivery pipe 8 and the third delivery pipe 10, so that the problem of the first flame arrester 6 in use state can be reduced and the temperature of the first delivery pipe 4 on both sides of the first flame arrester 6 in use state can be reduced, and the flame already existing in the first delivery pipe 4 can be suppressed by the delivered nitrogen, and nitrogen can be continuously delivered through the first delivery pipe 4 in standby state to prevent the flame from entering the first delivery pipe 4 in standby state, and finally, nitrogen is delivered to the downstream users in danger through the first delivery pipe 4 in standby state and the first delivery pipe 4 in use state, so as to suppress the trend of continuous combustion of the downstream users; and after the danger of the downstream users is overcome, the flame-retardant delivery device in standby state can be used to connect to the second combustion-supporting gas delivery pipe 15 to continuously deliver combustion-supporting gas to the downstream users again, thereby shortening the preparation time for the combustion-supporting gas supply system to be safely used again.

[0031] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A supply device for oxygen-enriched combustion gas, characterized in that: The invention comprises an air delivery pipe (1) and a nitrogen delivery main pipe (2), wherein a first mixer is arranged at the outlet end of the air delivery pipe (1), an oxygen delivery pipe (3) is arranged on the first mixer, a flame retardant delivery device is connected to the first mixer, two flame retardant delivery devices are arranged in parallel, and each flame retardant delivery device comprises a first delivery pipe (4) and first stop valves (4) arranged in sequence along the direction from close to the first mixer to far away from the first mixer. 5), a first flame arrester (6) and a first regulating valve (7), the first delivery pipe (4) between each first stop valve (5) and the first flame arrester (6) and the nitrogen delivery main pipe (2) are respectively connected through a second delivery pipe (8), and each second delivery pipe (8) is provided with a second stop valve (9), and the first delivery pipe (4) between the first flame arrester (6) and the first regulating valve (7) in the two flame retardant delivery devices is connected through a third delivery pipe (10), and the third delivery pipe (10) is provided with a second regulating valve (11).

2. The oxygen-enriched combustion-supporting gas supply device according to claim 1, characterized in that: The first mixer is provided with an inlet end of a first combustion-supporting gas delivery pipe (12), the first combustion-supporting gas delivery pipe (12) is provided with a first online chromatograph (13) and a first gas flowmeter (14), the outlet end of the first combustion-supporting gas delivery pipe (12) is provided with a second mixer, the second mixer is provided with an inlet end of a second combustion-supporting gas delivery pipe (15) and an outlet end of a first nitrogen delivery branch pipe (16), the inlet ends of the first delivery pipes (4) in the two flame retardant delivery devices are both connected to the outlet end of the second combustion-supporting gas delivery pipe (15), the inlet end of the first nitrogen delivery branch pipe (16) is connected to the nitrogen delivery main pipe (2), and the second combustion-supporting gas delivery pipe (15) is provided with a relay fan (17) and a second online chromatograph (18).

3. The oxygen-enriched combustion-supporting gas supply device according to claim 2, characterized in that: The second mixer and the first mixer both comprise a tank body (19), an air guide pipe (20) and an air guide cone (21) arranged on the tank body (19) in sequence from the inlet end of the tank body (19) to the outlet end of the tank body (19), and a spiral blade (22) arranged between the air guide cone (21) and the tank body (19); the outlet end of the air guide pipe (20) is located in the inner cavity of the tank body (19); the central axis of the air guide cone (21), the central axis of the inner cavity of the tank body (19) and the central axis of the air guide cone (21) are located on the same axis; the number of spiral blades (22) is a plurality, and the plurality of spiral blades (22) are evenly distributed on the outer side of the air guide cone (21) in a star shape; the outlet end of the oxygen delivery pipe (3) is connected to the inlet end of the air guide pipe (20) of the first mixer; and the inlet end of the air guide pipe (20) of the second mixer is connected to the outlet end of the first nitrogen delivery branch pipe (16).

4. The oxygen-enriched combustion-supporting gas supply device according to claim 2, characterized in that: The oxygen delivery pipe (3) and the nitrogen delivery main pipe (2) are respectively provided with a booster unit (23), a heat exchanger (24), a first temperature sensor (25), a buffer tank (26) and a first filter (27) in sequence from away from the flame retardant delivery device to close to the flame retardant delivery device. A pressure sensor (28) and a pressure relief valve (29) are provided on the top of the buffer tank (26). A sewage pipe (30) is provided on the bottom end of the buffer tank (26). A third stop valve (31) is provided on the sewage pipe (30).

5. The oxygen-enriched combustion-supporting gas supply device according to claim 4, characterized in that: The oxygen delivery pipe (3) between the first filter (27) installed on the oxygen delivery pipe (3) and the first mixer is provided with a third regulating valve (32), a second gas flow sensor (33) and a second flame arrester (34) in sequence in a direction away from the first mixer and closer to the first mixer. The two second delivery pipes (8) and the nitrogen delivery main pipe (2) are connected via a second nitrogen delivery branch pipe (35). The inlet end of the first nitrogen delivery branch pipe (16) and the inlet end of the second nitrogen delivery branch pipe (35) are both connected to the outlet end of the nitrogen delivery main pipe (2). The first nitrogen delivery branch pipe (16) is provided with a fourth regulating valve (36) and a third gas flow sensor (37).

6. The oxygen-enriched combustion-supporting gas supply device according to claim 1, characterized in that: Each of the flame retardant delivery devices further comprises a second temperature sensor (38) arranged on the first delivery pipe (4) between the first flame arrester (6) and the first regulating valve (7).

7. The oxygen-enriched combustion-supporting gas supply device according to claim 3, characterized in that: The outlet end of the air delivery pipe (1) is connected to the inlet end of the tank body (19) of the first mixer, and the air delivery pipe (1) is provided with a fourth gas flow sensor (39), a fifth regulating valve (40), an air blower (41) and a second filter (42) in sequence along the direction from close to the first mixer to far away from the first mixer.

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