Blast furnace oxygen-enriched combustion-supporting gas conveying device

Abstract

The utility model relates to a blast furnace oxygen-enriched combustion-supporting gas delivery device which comprises a first air delivery pipe and a second air delivery pipe, the first air delivery pipe is communicated with an adsorption tank, the first air delivery pipe is provided with a first self-cleaning air filter, a first fan, a freeze dryer and a filter, and the adsorption tank is communicated with an oxygen delivery header pipe. The second air conveying pipe is provided with a second self-cleaning air filter, a second fan, an air conveying branch pipe, a first adjusting valve, a first air mixer, a first online chromatographic instrument, a second air mixer, a third fan and a second online chromatographic instrument, and a first oxygen conveying branch pipe is arranged between the first air mixer and the oxygen conveying header pipe; a second oxygen conveying branch pipe is arranged between the second air mixer and the oxygen conveying header pipe, and the second air mixer is communicated with the second oxygen conveying branch pipe. And the oxygen concentration in the oxygen-enriched combustion-supporting gas is kept continuous and stable by using oxygen generated by the pressure swing adsorption equipment. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace oxygen-enriched combustion-aiding gas conveying equipment, in particular to a blast furnace oxygen-enriched combustion-aiding gas conveying device. Background Art

[0002] The principle of pressure swing adsorption oxygen production technology is to use the characteristics of molecular sieves selectively adsorbing nitrogen in the air and the ability to adsorb nitrogen increases with the increase of nitrogen partial pressure. By changing the adsorption operating pressure, nitrogen in the air is adsorbed at a higher pressure to release oxygen, and then the pressure is reduced to desorb nitrogen, thereby achieving the purpose of separating oxygen and nitrogen in the air. Each user adjusts the pressure according to their own needs. Blast furnaces do not require high oxygen purity. In the absence of other needs for finished industrial oxygen, oxygen with a purity of more than 99.6% produced by deep cold and low temperature distillation is used as the oxygen source for blast furnace oxygen-enriched combustion-supporting gas, which wastes energy utilization. According to the characteristics of pressure swing adsorption hydrogen production and the needs of blast furnace oxygen-enriched combustion-supporting gas, the design of pressure swing adsorption oxygen production can achieve the purpose of quality-based oxygen supply mode in the metallurgical industry.

[0003] Although pressure swing adsorption has the advantages of simple equipment, convenient operation and lower cost of use. As the operating time of the pressure swing adsorption oxygen production device increases, the adsorption tank carrying the molecular sieve as the core component will increase with the increase in the number of adsorption and desorption alternations, and the adsorption capacity of the molecular sieve will continue to decrease, and the oxygen produced by pressure swing adsorption will also fluctuate with the change of working pressure. The fluctuation of the oxygen concentration in the oxygen source of pressure swing adsorption will of course affect the fluctuation of the oxygen concentration in the oxygen-enriched combustion gas produced by the oxygen source. However, the oxygen content in the oxygen-enriched combustion gas used for the blast furnace should be maintained within a certain range, so that the fuel and combustion gas can reach a relatively stable temperature when burned in the blast furnace. The fluctuation of the oxygen concentration in the oxygen-enriched combustion gas will directly affect the furnace temperature of the blast furnace. Therefore, for the oxygen-enriched combustion gas using the oxygen produced by pressure swing adsorption as the oxygen source, there is room for improvement in the prior art, so that the oxygen concentration in the oxygen-enriched combustion gas in the blast furnace production process can be continuously and stably within a preset range, thereby achieving that the furnace temperature of the blast furnace can be maintained within a preset range. Under the premise of ensuring stable process operation, the company can reduce its initial investment in oxygen production equipment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the utility model provides a blast furnace oxygen-enriched combustion gas conveying device which utilizes oxygen produced by a pressure swing adsorption device as the oxygen source of the oxygen-enriched combustion gas and ensures that the oxygen concentration in the oxygen-enriched combustion gas can be continuously and stably maintained within a preset range, so as to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is as follows: a blast furnace oxygen-enriched combustion-supporting gas conveying device comprises a first air conveying pipe and a second air conveying pipe, the outlet end of the first air conveying pipe is connected with the inlet end of an adsorption tank, the first air conveying pipe is provided with a first self-cleaning air filter, a first fan, a freeze dryer and a filter in sequence along a direction away from the adsorption tank to a direction close to the adsorption tank, the outlet end of the adsorption tank is connected with an oxygen conveying main pipe, the second air conveying pipe is provided with a second self-cleaning air filter, a second fan, an inlet end of an air conveying branch pipe, a first regulating valve, a first air mixer, a first online chromatograph, a second air mixer, a third fan and a second online chromatograph in sequence along the inlet end of the second air conveying pipe to the outlet end of the second air conveying pipe, the first air mixer is connected with the oxygen conveying main pipe through the first oxygen conveying branch pipe, the second air mixer is connected with the oxygen conveying main pipe through the second oxygen conveying branch pipe, the second air mixer is connected with the outlet end of the air conveying branch pipe, and the air conveying branch pipe, the first oxygen conveying branch pipe and the second oxygen conveying branch pipe are respectively provided with a second regulating valve.

[0006] Preferably, the first air mixer and the second air mixer both include a mixing tank, an air guide cone arranged in the mixing tank, and mixing blades arranged between the air guide cone and the inner wall of the mixing tank; a first delivery bend is arranged between the inlet end of the mixing tank of the first air mixer and the air guide cone, and the first delivery bend is connected to the first oxygen delivery branch; a second delivery bend and a third delivery bend are arranged between the inlet end of the mixing tank of the first air mixer and the air guide cone, the second delivery bend is connected to the air delivery branch, and the third delivery bend is connected to the second oxygen delivery branch.

[0007] Preferably, there are two air guide cones, and a plurality of mixing blades are installed on the outer side of each air guide cone. The plurality of mixing blades installed on the outer side of each air guide cone are distributed in a star shape outside the central axis of the adjacent air guide cone.

[0008] Preferably, the number of the adsorption tanks is two, the two adsorption tanks and the first air delivery pipe are respectively connected through the first connecting pipe, the two adsorption tanks and the oxygen delivery main pipe are respectively connected through the second connecting pipe, the outlet ends of the two adsorption tanks are connected through a pressure equalizing pipe, the pressure equalizing pipe is provided with a third regulating valve, the inlet ends of the two adsorption tanks are respectively provided with the inlet ends of the third connecting pipe, the number of the third connecting pipes is two, the inlet ends of the two third connecting pipes are provided with the inlet ends of the desorption gas exhaust pipe, the desorption gas exhaust pipe is provided with a vacuum pump, and the first connecting pipe, the second connecting pipe and the third connecting pipe are respectively provided with stop valves.

[0009] Preferably, pressure sensors are respectively provided on the pressure equalizing pipes on both sides of the third regulating valve, a third online chromatograph is provided on the desorption gas discharge pipe, and a muffler is provided on the outlet end of the desorption gas discharge pipe.

[0010] Preferably, the inlet end of the second oxygen delivery branch and the inlet end of the first oxygen delivery branch are both installed on the oxygen delivery main pipe, and an oxygen compressor unit and a fourth online chromatograph are sequentially arranged between the inlet end of the second oxygen delivery branch and the inlet end of the oxygen delivery main pipe along the direction from close to the second oxygen delivery branch to away from the second oxygen delivery branch, and the inlet end of the first oxygen delivery branch is located between the oxygen compressor unit and the inlet end of the second oxygen delivery branch.

[0011] The beneficial effects of the utility model are as follows: firstly, the product utilizes the oxygen delivery main pipe to supply oxygen to the first air mixer through the first oxygen delivery branch pipe to form a first oxygen-enriched combustion gas, and then utilizes the second oxygen delivery branch pipe or the air delivery branch pipe to supply compressed air or oxygen to the first oxygen-enriched combustion gas again according to the parameters fed back by the first online chromatograph, so that the oxygen-enriched combustion gas delivered to the blast furnace user through the second air delivery pipe is always within the preset oxygen content range to meet the needs of the blast furnace user.

[0012] Secondly, the second air delivery pipe of the utility model is provided with a second self-cleaning air filter, a second fan, an inlet end of the air delivery branch pipe, a first regulating valve, a first air mixer, a first online chromatograph, a second air mixer, a third fan and a second online chromatograph in sequence from the inlet end to the outlet end of the second air delivery pipe; the first online chromatograph and the second online chromatograph are installed to facilitate the feedback of component parameters.

[0013] Finally, pressure sensors are respectively provided on the pressure equalizing pipes on both sides of the third regulating valve described in the utility model; installing the pressure sensors facilitates the feedback of pressure parameters.

[0014] 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

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0017] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B. DETAILED DESCRIPTION

[0018] like Figures 1 to 3 As shown, a blast furnace oxygen-enriched combustion gas conveying device comprises a first air conveying pipe 1 and a second air conveying pipe 2, the outlet end of the first air conveying pipe 1 is connected to the inlet end of an adsorption tank 3, the adsorption tank 3 comprises an adsorption tank body and a molecular sieve layer arranged in the adsorption tank body, the first air conveying pipe 1 is sequentially provided with a first self-cleaning air filter 4, a first fan 5, a freeze dryer 6 and a filter 7 along a direction away from the adsorption tank 3 to a direction close to the adsorption tank 3, the outlet end of the adsorption tank 3 is connected to an oxygen conveying main pipe 8, the second air conveying pipe 2 is sequentially provided with a second ... second air conveying pipe 2 is sequentially provided with a second self-cleaning air filter 4, a first fan 5, a freeze dryer 6 and a filter 7 An air filter 9, a second fan 10, an inlet end of an air delivery branch pipe 11, a first regulating valve 12, a first air mixer, a first online chromatograph 13, a second air mixer, a third fan 14 and a second online chromatograph 15. The first air mixer is connected to the oxygen delivery main pipe 8 through a first oxygen delivery branch pipe 16, the second air mixer is connected to the oxygen delivery main pipe 8 through a second oxygen delivery branch pipe 17, the second air mixer is connected to the outlet end of the air delivery branch pipe 11, and the air delivery branch pipe 11, the first oxygen delivery branch pipe 16 and the second oxygen delivery branch pipe 17 are respectively provided with a second regulating valve 18.

[0019] The second air delivery pipe 2 between the first air mixer and the first regulating valve 12 , the air delivery branch pipe 11 , the first oxygen delivery branch pipe 16 and the second oxygen delivery branch pipe 17 are respectively provided with a gas flow sensor 38 .

[0020] The first air mixer and the second air mixer both include a mixing tank 19, an air guide cone 20 disposed in the mixing tank 19, and a mixing blade 21 disposed between the air guide cone 20 and the inner wall of the mixing tank 19. A first delivery elbow 22 is disposed between the inlet end of the mixing tank 19 of the first air mixer and the air guide cone 20, and the first delivery elbow 22 is connected to the first oxygen delivery branch 16. A second delivery elbow 23 and a third delivery elbow 24 are disposed between the inlet end of the mixing tank 19 of the first air mixer and the air guide cone 20, and the second delivery elbow 23 is connected to the air delivery branch 11, and the third delivery elbow 24 is connected to the second oxygen delivery branch 17. The number of the air guide cones 20 is two, and the number of the mixing blades 21 installed on the outer side of each air guide cone 20 is a plurality, and the plurality of mixing blades 21 installed on the outer side of each air guide cone 20 are distributed in a star shape on the outer side of the central axis of the adjacent air guide cone 20.

[0021] The number of the adsorption tanks 3 is two, the two adsorption tanks 3 and the first air delivery pipe 1 are respectively connected through the first connecting pipe 25, the two adsorption tanks 3 and the oxygen delivery main pipe 8 are respectively connected through the second connecting pipe 26, the outlet ends of the two adsorption tanks 3 are connected through the pressure equalizing pipe 27, and the pressure equalizing pipe 27 is provided with a third regulating valve 28, and the inlet ends of the two adsorption tanks 3 are respectively provided with the inlet ends of the third connecting pipe 29, the number of the third connecting pipe 29 is two, and the inlet ends of the two third connecting pipes 29 are provided with the inlet ends of the desorption gas exhaust pipe 30, and the desorption gas exhaust pipe 30 is provided with a vacuum pump 31, and the first connecting pipe 25, the second connecting pipe 26 and the third connecting pipe 29 are respectively provided with a stop valve 32.

[0022] Pressure sensors 33 are respectively provided on the pressure equalizing pipes 27 on both sides of the third regulating valve 28 , a third online chromatograph 34 is provided on the desorbed gas discharge pipe 30 , and a muffler 35 is provided on the outlet end of the desorbed gas discharge pipe 30 .

[0023] The inlet end of the second oxygen delivery branch pipe 17 and the inlet end of the first oxygen delivery branch pipe 16 are both installed on the oxygen delivery main pipe 8. An oxygen compressor unit 36 ​​and a fourth online chromatograph 37 are sequentially arranged between the inlet end of the second oxygen delivery branch pipe 17 and the inlet end of the oxygen delivery main pipe 8 along the direction from close to the second oxygen delivery branch pipe 17 to away from the second oxygen delivery branch pipe 17. The inlet end of the first oxygen delivery branch pipe 16 is located between the oxygen compressor unit 36 ​​and the inlet end of the second oxygen delivery branch pipe 17.

[0024] The usage of this product is as follows: Figures 1 to 3 As shown, the following steps are included:

[0025] S1. Start the first fan 5. The outside air is filtered by the first self-cleaning air filter 4 and then enters the first air delivery pipe 1 to form the first compressed air. The first compressed air is filtered by the freeze dryer 6 to remove a large amount of water components and then filtered by the filter 7 and then delivered to the adsorption tank 3 in a working state. The first compressed air forms oxygen after passing through the adsorption tank 3 and is delivered to the oxygen delivery main pipe 8. After the concentration parameters are fed back by the fourth online chromatograph 37, the first compressed air is pressurized by the oxygen compressor unit 36 ​​to form pressurized oxygen and is continuously delivered to the user through the outlet end of the oxygen delivery main pipe 8.

[0026] S2, start the second fan 10 and the third fan 14, the outside atmosphere is filtered by the second self-cleaning air filter 9 and enters the second air delivery pipe 2 to form the second compressed air, the second compressed air passes through the inner cavity of the mixing tank 19 of the first air mixer, and the opening of the second regulating valve 18 installed on the first oxygen delivery branch pipe 16 is adjusted according to the flow rate of the second compressed air entering the first air mixer. At this time, the first part of the oxygen in the pressurized oxygen is sequentially delivered to the inner cavity of the mixing tank 19 of the first air mixer through the first oxygen delivery branch pipe 16 and the first delivery elbow 22, and the first part of the oxygen and the second compressed air form a rotating airflow under the action of the air guide cone 20 and the mixing blades 21 of the first air mixer, so as to fully mix the first part of the oxygen and the second compressed air to form the first oxygen-enriched combustion gas and continue to be delivered along the second air delivery pipe 2.

[0027] S3, after the first online chromatograph 13 feeds back the composition of the first oxygen-enriched combustion-supporting gas, if the oxygen content of the first oxygen-enriched combustion-supporting gas is higher than the preset requirement, the output power of the third fan 14 is adjusted and the openings of the second regulating valve 18 and the first regulating valve 12 on the air delivery branch pipe 11 are adjusted accordingly. At this time, the total amount of the second compressed air entering the second air delivery pipe 2 after being filtered by the second self-cleaning air filter 9 becomes larger. Under the condition that the flow rate of the second compressed air entering the first air mixer remains unchanged, the excess second compressed air is transported to the inner cavity of the mixing tank 19 of the second air mixer through the air delivery branch pipe 11 and the second delivery elbow 23. The first oxygen-enriched combustion-supporting gas and the second compressed air transported through the air delivery branch pipe 11 form a rotating airflow and a second oxygen-enriched combustion-supporting gas under the action of the air guide cone 20 and the mixing blades 21 of the first air mixer. The second oxygen-enriched combustion-supporting gas is transported to the blast furnace user after the component parameters are fed back by the second online chromatograph 15. And according to the component parameters fed back by the second online chromatograph 15, the output power of the third fan 14 is fine-tuned again, and the openings of the second regulating valve 18 and the first regulating valve 12 on the air delivery branch pipe 11 are adjusted accordingly so that the second oxygen-enriched combustion-supporting gas is within the optimal oxygen content range.

[0028] If the oxygen content of the first oxygen-enriched combustion-supporting gas is higher than the preset requirement, the second regulating valve 18 on the second oxygen delivery branch pipe 17 should be opened, and the pressurized oxygen will separate the second part of oxygen and deliver it to the inner cavity of the mixing tank 19 of the second air mixer through the second oxygen delivery branch pipe 17 and the third delivery elbow 24. The first oxygen-enriched combustion-supporting gas and the second part of oxygen delivered through the second oxygen delivery branch pipe 17 form a rotating airflow and a third oxygen-enriched combustion-supporting gas under the action of the gas guide cone 20 and the mixing blade 21 of the first air mixer. The third oxygen-enriched combustion-supporting gas is delivered to the blast furnace user after the component parameters are fed back by the second online chromatograph 15. And the opening of the second regulating valve 18 on the second oxygen delivery branch pipe 17 is fine-tuned again according to the component parameters fed back by the second online chromatograph 15 so that the third oxygen-enriched combustion-supporting gas is within the optimal oxygen content range.

[0029] It should also be noted that when the adsorption tank 3 in the working state runs for a preset time, the adsorption tank 3 in the standby state and the adsorption tank 3 in the working state should be switched. The specific process includes the following steps:

[0030] First, gradually open the opening of the third regulating valve 28. When the pressure sensor 33 between the third regulating valve 28 and the adsorption tank 3 in the standby state reaches the preset pressure range, close the stop valve 32 of the corresponding first connecting pipe 25 and the stop valve 32 of the second connecting pipe 26 on the adsorption tank 3 in the working state, and simultaneously open the stop valve 32 of the corresponding first connecting pipe 25 and the stop valve 32 of the second connecting pipe 26 on the adsorption tank 3 in the standby state. At this time, the switching between the adsorption tank 3 in the standby state and the adsorption tank 3 in the working state is completed. The adsorption tank 3 originally in the standby state is now the adsorption tank 3 in the working state, and the adsorption tank 3 originally in the working state is now the adsorption tank 3 in the state to be analyzed.

[0031] Then, the vacuum pump 31 is turned on, and the stop valve 32 on the third connecting pipe 29 is opened. At this time, the nitrogen and impurity gases adsorbed in the adsorption tank 3 in the state to be analyzed are discharged to the outside through the desorption gas discharge pipe 30. When the preset time is reached and the parameters fed back by the third online chromatograph 34 are referred to, the third regulating valve 28 is opened again and the opening of the third regulating valve 28 is reasonably adjusted so that the pressure sensor 33 between the adsorption tank 3 in the state to be analyzed and the third regulating valve 28 is always within the preset range and maintained for the preset time. When the parameters fed back by the third online chromatograph 34 reach the preset range, the stop valve 32 on the third connecting pipe 29, the vacuum pump 31 and the third regulating valve 28 are closed. At this time, the adsorption tank 3 in the state to be analyzed is converted into the adsorption tank 3 in the standby state again.

[0032] This product uses the basic principle of oxygen production by pressure swing adsorption to produce oxygen by adsorbing nitrogen in the molecular sieve layer of the adsorption tank 3 in the working state under high pressure. The molecular sieve layer of the adsorption tank 3 in the state to be analyzed desorbs nitrogen under low pressure to restore the adsorption capacity of the molecular sieve layer of the adsorption tank 3 in the state to be analyzed, and the oxygen produced by the adsorption tank 3 in the working state is transported as an oxygen flow as a replacement gas through the molecular sieve layer of the adsorption tank 3 in the state to be analyzed, so that the nitrogen in the molecular sieve layer of the adsorption tank 3 in the state to be analyzed is further analyzed, so that when the adsorption tank 3 in the state to be analyzed is converted into the adsorption tank 3 in the standby state again, the molecular sieve layer in the adsorption tank 3 in the standby state has a better adsorption capacity.

[0033] Through this embodiment, since the oxygen produced by the pressure swing adsorption equipment is greatly affected by pressure, which directly affects the oxygen concentration in the oxygen produced by pressure swing adsorption, this product uses the oxygen delivery main pipe 8 to supply oxygen to the first air mixer through the first oxygen delivery branch pipe 16 to form a first oxygen-enriched combustion gas, and then uses the second oxygen delivery branch pipe 17 or the air delivery branch pipe 11 to supply compressed air or oxygen to the first oxygen-enriched combustion gas again according to the parameters fed back by the first online chromatograph 13, so that the oxygen-enriched combustion gas delivered to the blast furnace user through the second air delivery pipe 2 is always within the preset oxygen content range to meet the needs of the blast furnace user.

[0034] 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 blast furnace oxygen-enriched combustion gas conveying device, characterized in that: The invention comprises a first air delivery pipe (1) and a second air delivery pipe (2), wherein the outlet end of the first air delivery pipe (1) is connected to the inlet end of an adsorption tank (3), the first air delivery pipe (1) is provided with a first self-cleaning air filter (4), a first fan (5), a freeze dryer (6) and a filter (7) in sequence from the inlet end of the adsorption tank (3) to the outlet end of the adsorption tank (3), the outlet end of the adsorption tank (3) is connected to an oxygen delivery main pipe (8), and the second air delivery pipe (2) is provided with a second self-cleaning air filter (9), a second fan (10), an air delivery branch pipe (11) and a filter (7) in sequence from the inlet end of the second air delivery pipe (2) to the outlet end of the second air delivery pipe (2). The invention relates to an oxygen delivery pipe (11), an inlet end of the pipe (11), a first regulating valve (12), a first air mixer, a first online chromatograph (13), a second air mixer, a third fan (14) and a second online chromatograph (15); the first air mixer is connected to the oxygen delivery main pipe (8) through a first oxygen delivery branch pipe (16); the second air mixer is connected to the oxygen delivery main pipe (8) through a second oxygen delivery branch pipe (17); the second air mixer is connected to the outlet end of the air delivery branch pipe (11); and the air delivery branch pipe (11), the first oxygen delivery branch pipe (16) and the second oxygen delivery branch pipe (17) are respectively provided with a second regulating valve (18).

2. The blast furnace oxygen-enriched combustion gas conveying device according to claim 1, characterized in that: The first air mixer and the second air mixer both comprise a mixing tank (19), an air guide cone (20) arranged in the mixing tank (19), and a mixing blade (21) arranged between the air guide cone (20) and the inner wall of the mixing tank (19); a first delivery elbow (22) is arranged between the inlet end of the mixing tank (19) of the first air mixer and the air guide cone (20); the first delivery elbow (22) is connected to the first oxygen delivery branch pipe (16); a second delivery elbow (23) and a third delivery elbow (24) are arranged between the inlet end of the mixing tank (19) of the first air mixer and the air guide cone (20); the second delivery elbow (23) is connected to the air delivery branch pipe (11); and the third delivery elbow (24) is connected to the second oxygen delivery branch pipe (17).

3. The blast furnace oxygen-enriched combustion gas conveying device according to claim 2, characterized in that: The number of the air guide cones (20) is two, the number of the mixing blades (21) installed on the outer side of each air guide cone (20) is a plurality, and the plurality of mixing blades (21) installed on the outer side of each air guide cone (20) are distributed in a star shape on the outer side of the central axis of the adjacent air guide cone (20).

4. The blast furnace oxygen-enriched combustion gas conveying device according to claim 1, characterized in that: The number of the adsorption tanks (3) is two, the two adsorption tanks (3) and the first air delivery pipe (1) are respectively connected via a first connecting pipe (25), the two adsorption tanks (3) and the oxygen delivery main pipe (8) are respectively connected via a second connecting pipe (26), the outlet ends of the two adsorption tanks (3) are connected via a pressure equalizing pipe (27), a third regulating valve (28) is provided on the pressure equalizing pipe (27), the inlet ends of the two adsorption tanks (3) are respectively provided with the inlet ends of the third connecting pipe (29), the number of the third connecting pipes (29) is two, the inlet ends of the two third connecting pipes (29) are provided with the inlet ends of the desorbed gas exhaust pipe (30), the desorbed gas exhaust pipe (30) is provided with a vacuum pump (31), and the first connecting pipe (25), the second connecting pipe (26) and the third connecting pipe (29) are respectively provided with stop valves (32).

5. The blast furnace oxygen-enriched combustion gas conveying device according to claim 4, characterized in that: Pressure sensors (33) are respectively provided on the pressure equalizing pipes (27) on both sides of the third regulating valve (28), a third online chromatograph (34) is provided on the desorbed gas discharge pipe (30), and a muffler (35) is provided on the outlet end of the desorbed gas discharge pipe (30).

6. The blast furnace oxygen-enriched combustion gas conveying device according to claim 1, characterized in that: The inlet end of the second oxygen delivery branch pipe (17) and the inlet end of the first oxygen delivery branch pipe (16) are both mounted on the oxygen delivery main pipe (8); an oxygen compressor unit (36) and a fourth online chromatograph (37) are sequentially arranged between the inlet end of the second oxygen delivery branch pipe (17) and the inlet end of the oxygen delivery main pipe (8) along a direction from close to the second oxygen delivery branch pipe (17) to far away from the second oxygen delivery branch pipe (17); and the inlet end of the first oxygen delivery branch pipe (16) is located between the oxygen compressor unit (36) and the inlet end of the second oxygen delivery branch pipe (17).

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