An operating system and operating method for increasing the oxygen production of an oxygen production station in summer

Abstract

The present invention discloses an operating system for increasing the oxygen production of an oxygen production station in summer, belonging to the field of oxygen supply in iron and steel metallurgy. It includes four air separation towers distributed in four areas of the oxygen production station and four independent air compressors connected to their respective air separation towers through pipelines. The air separation towers are respectively two sets of 4500 m³ / h air separation, one set of 10000 m³ / h air separation, and one set of 15000 m³ / h air separation. It also includes a compressed air main pipeline connected to the outlet pipelines of the four air compressors. A medium-sized air compressor and a small-sized air compressor are connected to the compressed air main pipeline. The medium-sized air compressor is close to the 10000 m³ / h air separation tower, and the small-sized air compressor is close to the 15000 m³ / h air separation tower. Valves are arranged between each air compressor and between the air compressor and the air separation tower. The present invention operates different modes according to different air compression densities in summer and winter to ensure that the gas production of the two largest oxygen production air separation devices in summer meets the working requirements.

Description

Technical Field

[0001] The present invention relates to the field of oxygen supply in iron and steel metallurgy, in particular to an oxygen supply system and method for an oxygen station. Background Art

[0002] In the iron and steel metallurgy industry, the demand for oxygen-enriched and pure oxygen in the ironmaking and steelmaking processes is increasing. The oxygen production process is designed according to the production capacity planning of ironmaking and steelmaking in terms of oxygen output. At present, our company operates 2 sets of 4500 m 3 / h air separation units, 1 set of 10000 m 3 / h air separation unit, and 1 set of 15000 m 3 / h air separation unit. The total oxygen production is 34000 m 3 / h, which matches the oxygen consumption of the ironmaking and steelmaking workshops. When the winter temperature is relatively low, the air pressure density becomes larger, and the air intake of the air separation tower gradually increases. The total oxygen production reaches a maximum of 36000 m 3 / h; in the high-temperature summer season, the output of each air separation unit decreases, reaching a minimum of 30500 m 3 / h. In particular, the air separation unit with the largest output decreases the most significantly, by 2000 m per hour 3 / h. The specific operation mode is as follows: The four air separation units in the oxygen production station are distributed in four areas within the oxygen production station, and each set of equipment operates independently. When the winter temperature is relatively low, the four air separation units can produce at full load. When the summer temperature is relatively high, the oxygen production is insufficient and there is no guarantee measure. Refer to the appendix Figure 1 . Therefore, in summer, in order to ensure the oxygen demand in the factory, liquid oxygen is usually purchased externally to supplement the oxygen consumption in the factory, increasing the oxygen cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an operation system and an operation method for improving the oxygen production of an oxygen production station in summer, adding small and medium-sized air compressors, and operating different modes according to different air pressure densities in summer and winter to ensure that the gas production of the two largest oxygen production air separation units in summer meets the working requirements.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An operation system for improving the oxygen production of an oxygen production station in summer, including four air separation towers distributed in four areas of the oxygen production station and four air compressors that operate independently and are connected to their respective air separation towers through pipelines. The air separation towers are respectively 2 sets of 4500 m 3 / h air separation units, 1 set of 10000 m 3 / h air separation unit, and 1 set of 15000 m 3 / h air separation unit. The exhaust gas volume of the four air compressors is 480 m 3 / min, 480 m 3 / min, 920 m 3 / min, 1350 m 3 / min, and also includes a compressed air main pipeline connected to the outlet pipelines of four air compressors. A medium-sized air compressor with a displacement of 1100 m 3 / min and a small air compressor with a displacement of 250 m 3 / min are connected to the compressed air main pipeline. The medium-sized air compressor is close to the 10000 m 3 / h air separation tower, and the small air compressor is close to the 15000 m 3 / h air separation tower. Valves are arranged between each air compressor and between the air compressor and the air separation tower.

[0006] A further improvement of the technical solution of the present invention lies in: it also includes a control terminal, and each air compressor and valve are connected to the control terminal and controlled by the control terminal.

[0007] A further improvement of the technical solution of the present invention lies in: the two 4500 m 3 / h air separation towers are arranged in parallel and are respectively the 1# air separation tower and the 2# air separation tower. One 10000 m 3 / h air separation tower and one 15000 m 3 / h air separation tower are arranged in parallel and are respectively the 3# air separation tower and the 4# air separation tower. The 1# air separation tower, the 2# air separation tower, the 3# air separation tower and the 4# air separation tower respectively correspond to the 1# air compressor, the 2# air compressor, the 3# air compressor and the 4# air compressor.

[0008] Between the 1# air separation tower and the 1# air compressor, between the 2# air separation tower and the 2# air compressor, between the 3# air separation tower and the 3# air compressor, and between the 4# air separation tower and the 4# air compressor are respectively connected through outlet pipelines. 1# valve, 2# valve, 3# valve and 4# valve are respectively arranged on each outlet pipeline. Between the 1# valve and the 3# valve are connected through a branch pipeline. A 5# valve is arranged near the 1# valve position and a 7# valve is arranged near the 3# valve position on the branch pipeline. Between the 2# valve and the 4# valve are connected through a branch pipeline. A 6# valve is arranged near the 2# valve position and an 8# valve is arranged near the 4# valve position on the branch pipeline. The branch pipeline between the 5# valve and the 7# valve is connected to the branch pipeline between the 6# valve and the 8# valve through the compressed air main pipeline. And a 9# valve is arranged between the medium-sized air compressor and the small air compressor.

[0009] A further improvement of the operation method of the technical solution of the present invention lies in: when the winter temperature is relatively low, the four air compressors corresponding to the four air separation towers start to operate independently;

[0010] When the summer temperature is relatively high, first, the two air compressors corresponding to the two 4500 m 3 / h air separation towers operate independently; then start the small air compressor, 15000 m3 The air compressors corresponding to the / h air separation tower and the small air compressor jointly supply air to the 15000 m 3 / h air separation tower; finally, start the medium-sized air compressor and stop the air compressor corresponding to the 10000 m 3 / h air separation tower.

[0011] The operation method of the technical solution of the present invention is further improved in that: when the winter temperature is relatively low, close the 5# valve, 6# valve, 7# valve, 8# valve, and the 1# air compressor, 2# air compressor, 3# air compressor, and 4# air compressor operate independently;

[0012] When the summer temperature is relatively high, first, ensure that the 1# air compressor and the 2# air compressor operate independently; then, close the 9# valve, open the 8# valve, start the small air compressor, and let the 4# air compressor and the small air compressor jointly supply air to the 4# air separation tower to ensure the air intake volume; finally, open the 7# valve, start the medium-sized air compressor, and stop the 3# air compressor to ensure the summer air volume of the 3# air separation tower.

[0013] The operation method of the technical solution of the present invention is further improved in that: when the 4# air compressor fails and needs to be shut down for maintenance, the 4# valve, 8# valve, and 9# valve can be opened, and the medium-sized air compressor and the small air compressor are relied on to supply air to the 4# air separation tower.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0015] The present invention transforms the compressed air pipeline of the oxygen production system, adds a compressed air main pipeline, and at the same time adds small and medium-sized air compressors, and their outlets are connected to the compressed air main pipeline. When the intake air volume of the oxygen production air separation tower in summer is insufficient, the total amount of compressed air can be supplemented by the small air compressor, and at the same time, a medium-sized air compressor is added, which can replace the 10000 m 3 / h air compressor to ensure that the gas production of the two largest oxygen production air separation devices in summer meets the in-plant use.

[0016] When the 15000 m 3 / h air compressor fails and needs to be shut down for maintenance, the medium-sized air compressor and the small air compressor can be relied on to supply air to the 15000 m 3 / h air separation system; at the same time, when other units need to be overhauled, in order not to affect the total oxygen output, various mode allocation methods can be adopted to ensure the total oxygen output of the four air separation systems. Brief Description of the Drawings

[0017] Figure 1 is the layout diagram of the prior art of the present invention;

[0018] Figure 2 is the system layout diagram of the present invention;

[0019] Among them, 1 is the main compressed air pipeline, 2 is the medium-sized air compressor, 3 is the small-sized air compressor, 4 is the 1# air separation tower, 5 is the 2# air separation tower, 6 is the 3# air separation tower, 7 is the 4# air separation tower, 8 is the 1# air compressor, 9 is the 2# air compressor, 10 is the 3# air compressor, 11 is the 4# air compressor, 12 is the 1# valve, 13 is the 2# valve, 14 is the 3# valve, 15 is the 4# valve, 16 is the 5# valve, 17 is the 6# valve, 18 is the 7# valve, 19 is the 8# valve, 20 is the 9# valve. Detailed implementation mode

[0020] The present invention will be further described in detail below in conjunction with embodiments:

[0021] An operating system for increasing the oxygen production of an oxygen production station in summer, as Figure 2 shown, includes four air separation towers distributed in four areas of the oxygen production station. Each air separation tower is equipped with an independently operating air compressor, and the air compressor is connected to its respective air separation tower through a pipeline. The air separation towers are respectively 2 sets of 4500 m 3 / h air separation, 1 set of 10000 m 3 / h air separation, 1 set of 15000 m 3 / h air separation, and the exhaust volumes of the four air compressors are all 480 m 3 / min, 480 m 3 / min, 920 m 3 / min, 1350 m 3 / min.

[0022] The present invention transforms the compressed air pipeline of the oxygen production system, adds a main compressed air pipeline 1, and the main compressed air pipeline 1 is connected to the outlet pipelines of the four air compressors. A medium-sized air compressor 2 and a small-sized air compressor 3 are connected to the main compressed air pipeline 1. The exhaust volume of the medium-sized air compressor 2 is 1100 m 3 / min, and the exhaust volume of the small-sized air compressor 3 is 250 m 3 / min. The medium-sized air compressor 2 is close to the 10000 m 3 / h air separation tower, and the small-sized air compressor 3 is close to the 15000 m 3 / h air separation tower. Valves are arranged between the air compressors and between the air compressors and the air separation towers.

[0023] The specific layout is as follows:

[0024] The 2 sets of 4500 m 3 / h air separation towers are arranged in parallel as the 1# air separation tower 4 and the 2# air separation tower 5 respectively. 1 set of 10000 m 3 / h air separation tower, 1 set of 15000 m 3The air separation towers are arranged in parallel and are respectively the 3# air separation tower 6 and the 4# air separation tower 7. The 1# air separation tower 4, the 2# air separation tower 5, the 3# air separation tower 6 and the 4# air separation tower 7 respectively correspond to the 1# air compressor 8, the 2# air compressor 9, the 3# air compressor 10 and the 4# air compressor 11.

[0025] The 1# air separation tower 4 is connected to the 1# air compressor 8 through an outlet pipeline, and a 1# valve 12 is arranged on the outlet pipeline. The 2# air separation tower 5 is connected to the 2# air compressor 9 through an outlet pipeline, and a 2# valve 13 is arranged on the outlet pipeline. The 3# air separation tower 6 is connected to the 3# air compressor 10 through an outlet pipeline, and a 3# valve 14 is arranged on the outlet pipeline. The 4# air separation tower 7 is connected to the 4# air compressor 11 through an outlet pipeline, and a 4# valve 15 is arranged on the outlet pipeline. The 1# valve 12 and the 3# valve 14 are connected through a branch pipeline. A 5# valve 16 is arranged near the 1# valve 12 on the branch pipeline, and a 7# valve 18 is arranged near the 3# valve 14. The 2# valve 13 and the 4# valve 15 are connected through a branch pipeline. A 6# valve 17 is arranged near the 2# valve 13 on the branch pipeline, and an 8# valve 19 is arranged near the 4# valve 15. The branch pipeline between the 5# valve 16 and the 7# valve 18 is connected to the branch pipeline between the 6# valve 17 and the 8# valve 19 through a compressed air main pipeline 1, and a 9# valve 20 is arranged between the medium-sized air compressor 2 and the small-sized air compressor 3.

[0026] An operation method for increasing the oxygen production of the oxygen production station in summer. When the temperature is relatively low in winter, the 5# valve 16, the 6# valve 17, the 7# valve 18 and the 8# valve 19 are closed, and the 1# air compressor 8, the 2# air compressor 9, the 3# air compressor 10 and the 4# air compressor 11 operate independently.

[0027] When the temperature is relatively high in summer, in order to ensure the oxygen production capacity to the maximum extent, it is necessary to ensure that the 10,000 air separation and 15,000 air separation operate at full load. First, ensure that the 1# air compressor 8 and the 2# air compressor 9 operate independently. Then, close the 9# valve 20, open the 8# valve 19, start the small-sized air compressor 3, and let the 4# air compressor 11 and the small-sized air compressor 3 supply air to the 4# air separation tower 7 together to ensure the air intake volume. Finally, open the 7# valve 18, start the medium-sized air compressor 2, and stop the 3# air compressor 10 to ensure the summer air volume of the 3# air separation tower 6.

[0028] When the 4# air compressor 11 fails and needs to be shut down for maintenance, the 4# valve 15, the 8# valve 19 and the 9# valve 20 can be opened, and the medium-sized air compressor 2 and the small-sized air compressor 3 are relied on to supply air to the 4# air separation tower 7.

[0029] At the same time, when other units need to be overhauled, in order not to affect the total oxygen production, the total oxygen production of the four air separation systems can be ensured through various mode allocation methods.

[0030] Example 2

[0031] The system may further include a control terminal, and each air compressor and valve is connected to the control terminal and controlled by the control terminal to achieve networked automatic control.

Claims

1. An operating system for increasing the oxygen production of an oxygen generation station in summer, comprising four air separation towers distributed in four areas of the oxygen generation station and four independent air compressors connected to their respective air separation towers through pipelines. The air separation towers are respectively two 4500 m³ / h air separations, one 10000 m³ / h air separation, and one 15000 m³ / h air separation. The exhaust volumes of the four air compressors are 480 m³ / min, 480 m³ / min, 920 m³ / min, and 1350 m³ / min respectively. It is characterized in that: It also includes a compressed air main pipeline (1) connected to the outlet pipelines of four sets of air compressors. A medium-sized air compressor (2) with a displacement of 1100 m³ / min and a small-sized air compressor (3) with a displacement of 250 m³ / min are connected to the compressed air main pipeline (1). The medium-sized air compressor (2) is close to the 10000 m³ / h air separation tower, and the small-sized air compressor (3) is close to the 15000 m³ / h air separation tower. Valves are arranged between each air compressor and between the air compressor and the air separation tower; The two sets of 4500 m³ / h air separation towers are arranged in parallel as the 1# air separation tower (4) and the 2# air separation tower (5) respectively. One set of 10000 m³ / h air separation tower and one set of 15000 m³ / h air separation tower are arranged in parallel as the 3# air separation tower (6) and the 4# air separation tower (7) respectively. The 1# air separation tower (4), the 2# air separation tower (5), the 3# air separation tower (6) and the 4# air separation tower (7) correspond to the 1# air compressor (8), the 2# air compressor (9), the 3# air compressor (10) and the 4# air compressor (11) respectively; Between the 1# air separation tower (4) and the 1# air compressor (8), between the 2# air separation tower (5) and the 2# air compressor (9), between the 3# air separation tower (6) and the 3# air compressor (10), and between the 4# air separation tower (7) and the 4# air compressor (11), they are connected through outlet pipelines respectively. 1# valve (12), 2# valve (13), 3# valve (14) and 4# valve (15) are correspondingly arranged on each outlet pipeline. Between the 1# valve (12) and the 3# valve (14), they are connected through a branch pipeline. A 5# valve (16) is arranged at a position close to the 1# valve (12) on the branch pipeline, and a 7# valve (18) is arranged at a position close to the 3# valve (14). Between the 2# valve (13) and the 4# valve (15), they are connected through a branch pipeline. A 6# valve (17) is arranged at a position close to the 2# valve (13) on the branch pipeline, and an 8# valve (19) is arranged at a position close to the 4# valve (15). The branch pipeline between the 5# valve (16) and the 7# valve (18) is connected to the branch pipeline between the 6# valve (17) and the 8# valve (19) through the compressed air main pipeline (1), and a 9# valve (20) is arranged between the medium-sized air compressor (2) and the small-sized air compressor (3); When the summer temperature is relatively high, first, the two sets of air compressors corresponding to the two sets of 4500 m³ / h air separation towers operate independently; Then start the small-sized air compressor, and the air compressor corresponding to the 15000 m³ / h air separation tower and the small-sized air compressor supply air to the 15000 m³ / h air separation tower together; Finally, start the medium-sized air compressor and stop the air compressor corresponding to the 10000 m³ / h air separation tower.

2. The operating system for increasing the oxygen production of an oxygen generation station in summer according to claim 1, characterized in that: It also includes a control terminal, and each air compressor and valve are connected to the control terminal and controlled by the control terminal.

3. An operating method for increasing the oxygen production of an oxygen generation station in summer, according to the operating system for increasing the oxygen production of an oxygen generation station in summer described in claim 1 or 2, characterized in that: When the winter temperature is relatively low, the four sets of air compressors corresponding to the four sets of air separation towers start independently.

4. The operating method for increasing the oxygen production of an oxygen generation station in summer according to claim 3, characterized in that: When the winter temperature is relatively low, close the 5# valve (16), 6# valve (17), 7# valve (18), 8# valve (19), and the 1# air compressor (8), 2# air compressor (9), 3# air compressor (10), 4# air compressor (11) operate independently; When the summer temperature is relatively high, first, ensure that the No. 1 air compressor (8) and the No. 2 air compressor (9) operate independently; then, close the No. 9 valve (20), open the No. 8 valve (19), start the small air compressor (3), and let the No. 4 air compressor (11) and the small air compressor (3) supply air to the No. 4 air separation tower (7) together to ensure the air intake; finally, open the No. 7 valve (18), start the medium-sized air compressor (2), and stop the No. 3 air compressor (10) to ensure the air volume of the No. 3 air separation tower (6) in summer.

5. The operating method for increasing the oxygen production of an oxygen generation station in summer according to claim 3, characterized in that: When the No. 4 air compressor (11) fails and needs to be shut down for maintenance, the No. 4 valve (15), the No. 8 valve (19), and the No. 9 valve (20) can be opened, and rely on the medium-sized air compressor (2) and the small air compressor (3) to supply air to the No. 4 air separation tower (7).

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