Converter gas heat recovery and reuse system

Abstract

This invention discloses a system for recovering and reusing the heat of converter gas, belonging to the field of iron and steel smelting technology. To address the problem of low waste heat recovery and utilization rate of converter gas in existing technologies, the system includes a first regenerator (6), a second regenerator (16), and a pressurizing device (11) connected by a gas pipeline. The converter gas can alternately enter the first regenerator (6) and the second regenerator (16) to release heat. In this system, the converter gas alternately enters the first and second regenerators to absorb and release heat, transforming the high-temperature, low-pressure converter gas into high-temperature, high-pressure converter gas for use in blast furnace ironmaking. Without vaporization cooling and evaporation cooling processes, the loss of waste heat from the converter gas is minimal, significantly improving the efficiency of waste heat recovery and utilization.

Description

Technical Field

[0001] This invention relates to the field of iron and steel smelting technology, specifically a system for recovering and reusing the heat of converter gas. Background Technology

[0002] The temperature of converter gas discharged from the converter nozzle reaches as high as 1450℃-1500℃. Its main components are CO, CO2, O2, N2, and Ar, as well as dust carried by the gas, such as FeO, Fe2O3, CaO, and SiO2, with a total dust content of 80g / Nm³. 3 -150g / Nm 3 Converter gas has a high calorific value and is of high recovery value.

[0003] The general recovery process for converter gas is as follows: High-temperature converter gas enters the vaporization cooling flue for initial cooling, reaching 800℃-1000℃ before entering the evaporative cooler; the evaporative cooler uses a metered spray cooling method, utilizing the latent heat of vaporization of water to cool, coarsely remove dust, and humidify and condition the converter gas, reducing the temperature to 150℃-200℃; the converter gas then undergoes fine dust removal via an electrostatic precipitator, reducing the dust content to 10mg / Nm³. 3 The gas is then pressurized by a blower. Qualified converter gas is sent to the gas holder, while unqualified gas is released through a venting tower.

[0004] The purification process described above requires the use of water or steam to rapidly cool the gas, and the waste heat of the converter gas at 800℃-1000℃ is not recovered. Currently, the preheating recovery rate of converter gas is only about 50%. Summary of the Invention

[0005] To address the problem of low waste heat recovery and utilization rate of converter gas in the prior art, this invention provides a system for recovering and reusing heat from converter gas. In this system, the converter gas alternately enters a first regenerator and a second regenerator to absorb and release heat. The high-temperature, low-pressure converter gas is transformed into high-temperature, high-pressure converter gas for use in blast furnace ironmaking. There is no vaporization cooling or evaporation cooling process, resulting in less waste heat loss from the converter gas and significantly improving the efficiency of waste heat recovery and utilization.

[0006] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows:

[0007] A system for recovering and reusing the heat of converter gas includes a first regenerator, a second regenerator, and a pressurizing device connected by a gas pipeline. The converter gas can alternately enter the first and second regenerators to release heat. When the converter gas enters the first regenerator to release heat, the first regenerator can store heat. After releasing heat, the converter gas can enter the pressurizing device, which pressurizes the gas and sends it to the second regenerator to absorb heat, where the second regenerator releases heat. When the converter gas enters the second regenerator to release heat, the second regenerator can store heat. After releasing heat, the converter gas can enter the pressurizing device, which pressurizes the gas and sends it to the first regenerator to absorb heat, where the first regenerator releases heat.

[0008] The gas pipeline includes a first high-temperature gas short pipe, a first high-temperature low-pressure gas inlet pipe and a high-temperature low-pressure converter gas pipe connected in sequence. One end of the first high-temperature gas short pipe is connected to the first inlet and outlet of the first regenerator. The inlet end of the high-temperature low-pressure converter gas pipe is connected to the converter. A first shut-off valve is installed on the first high-temperature low-pressure gas inlet pipe.

[0009] The gas transmission pipeline also includes a first high-temperature and high-pressure gas outlet pipeline and a high-temperature and high-pressure gas main pipeline. The inlet end of the first high-temperature and high-pressure gas outlet pipeline is connected to the other end of the first high-temperature gas short pipe, the outlet end of the first high-temperature and high-pressure gas outlet pipeline is connected to the inlet end of the high-temperature and high-pressure gas main pipeline, the outlet end of the high-temperature and high-pressure gas main pipeline is connected to the blast furnace, and a second shut-off valve is installed on the first high-temperature and high-pressure gas outlet pipeline.

[0010] The converter gas heat recovery and reuse system also includes a gas storage device. The gas pipeline includes a first low-temperature gas short pipe, a first low-temperature low-pressure gas outlet pipe and an input pipe connected in sequence. One end of the first low-temperature gas short pipe is connected to the second inlet and outlet of the first regenerator. The outlet end of the input pipe is connected to the inlet end of the gas storage device. A third shut-off valve is installed on the first low-temperature low-pressure gas outlet pipe.

[0011] The gas transmission pipeline also includes a first low-temperature high-pressure gas inlet pipeline and an outlet pipeline. One end of the first low-temperature high-pressure gas inlet pipeline is connected to the other end of the first low-temperature gas short pipe, and the other end of the first low-temperature high-pressure gas inlet pipeline is connected to the outlet end of the outlet pipeline. The inlet end of the outlet pipeline is connected to the outlet end of the gas storage device. A pressurizing device is located on the outlet pipeline, and a fourth shut-off valve is installed on the first low-temperature high-pressure gas inlet pipeline.

[0012] The gas pipeline also includes a second high-temperature gas short pipe and a second high-temperature low-pressure gas inlet pipe connected in sequence. One end of the second high-temperature gas short pipe is connected to the first inlet and outlet of the second regenerator. The inlet end of the second high-temperature low-pressure gas inlet pipe is connected to the outlet end of the high-temperature low-pressure converter gas pipe. A fifth shut-off valve is installed on the second high-temperature low-pressure gas inlet pipe.

[0013] The gas pipeline also includes a second high-temperature and high-pressure gas outlet pipeline. The inlet end of the second high-temperature and high-pressure gas outlet pipeline is connected to the other end of the second high-temperature gas short pipe, and the outlet end of the second high-temperature and high-pressure gas outlet pipeline is connected to the inlet end of the high-temperature and high-pressure gas main pipe. A sixth shut-off valve is installed on the second high-temperature and high-pressure gas outlet pipeline.

[0014] The gas pipeline also includes a second low-temperature gas short pipe and a second low-temperature low-pressure gas outlet pipe connected in sequence. One end of the second low-temperature gas short pipe is connected to the second inlet and outlet of the second regenerator. The outlet end of the second low-temperature low-pressure gas outlet pipe is connected to the inlet end of the input pipe. A seventh shut-off valve is installed on the second low-temperature low-pressure gas outlet pipe.

[0015] The gas transmission pipeline also includes a second low-temperature high-pressure gas inlet pipeline. One end of the second low-temperature high-pressure gas inlet pipeline is connected to the other end of the second low-temperature gas short pipe, and the other end of the second low-temperature high-pressure gas inlet pipeline is connected to the outlet end of the output pipeline. An eighth shut-off valve is installed on the second low-temperature high-pressure gas inlet pipeline.

[0016] Both the first and second regenerators are equipped with heat storage bodies. Both the first and second regenerators are connected to exhaust pipes, combustible gas supply pipes, and combustion air pipes. The combustible gas supplied by the combustible gas supply pipes can burn and heat the heat storage bodies.

[0017] The beneficial effects of this invention are: it can efficiently store the heat of high-temperature, low-pressure, dust-laden converter gas; after the converter gas is pressurized, most of the heat is returned to the converter gas, making it convenient to inject into the blast furnace, with a heat exchange efficiency of over 90%. If the recovered heat from the converter gas is insufficient to reach the required temperature, the regenerator can be supplemented by burning combustible gas. The combustible gas is not limited to blast furnace gas, converter gas, coke oven gas, natural gas, etc.

[0018] When the regenerator receives high-temperature, low-pressure converter gas, a matching gravity or cyclone coarse dust removal device can be installed in the space inside the regenerator to remove particulate matter in the converter gas to a certain extent.

[0019] Low-temperature and low-pressure pipelines include, but are not limited to, dust removal, pressurization, desulfurization, deoxygenation, dehydration, decarbonization, denitrification, and coal gas enrichment. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the converter gas heat recovery and reuse system described in this invention.

[0022] Figure 2 It is a schematic diagram of the exhaust duct, the combustible gas supply duct, and the combustion air duct.

[0023] Figure 3 This is a schematic diagram of the structure of the first and second regenerators.

[0024] The annotations in the attached figures are explained as follows:

[0025] 1. Converter; 2. High-temperature and low-pressure converter gas pipeline; 3. First high-temperature and low-pressure gas inlet pipeline; 4. First shut-off valve; 5. First high-temperature gas short pipe; 6. First regenerator; 7. First low-temperature gas short pipe; 8. First low-temperature and low-pressure gas outlet pipeline; 9. Third shut-off valve; 10. Input pipeline; 11. Pressurizing device; 12. Output pipeline; 13. Eighth shut-off valve; 14. Second low-temperature and high-pressure gas inlet pipeline; 15. Second low-temperature gas short pipe; 16. Second regenerator; 17. Second high-temperature gas short pipe; 18. Second high-temperature and high-pressure gas outlet pipeline; 19. Sixth shut-off valve; 20. High-temperature and high-pressure gas main pipeline; 21. Blast furnace; 22. 23. High-temperature low-pressure gas inlet pipeline; 24. Fifth shut-off valve; 25. Seventh shut-off valve; 26. Second low-temperature low-pressure gas outlet pipeline; 27. Fourth shut-off valve; 28. First low-temperature high-pressure gas inlet pipeline; 29. ​​First high-temperature high-pressure gas outlet pipeline; 30. Second shut-off valve; 31. Combustible gas supply pipeline; 32. First flow meter; 33. First regulating valve; 34. Shut-off valve; 35. First combustion valve; 36. Combustion fan; 37. Combustion air pipeline; 38. Second flow meter; 39. Second regulating valve; 40. Second combustion valve; 41. Exhaust pipe; 42. Flue valve; 43. Chimney; 44. Heat storage body; 45. Gas storage device. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figure 1As shown in the embodiment of the present invention, a system for recovering and reusing the heat of converter gas includes a first regenerator 6, a second regenerator 16, and a pressurizing device 11 connected by a gas pipeline. The converter gas can alternately enter the first regenerator 6 and the second regenerator 16 to release heat. When the converter gas enters the first regenerator 6 to release heat, the first regenerator 6 can store heat. The released converter gas (low temperature and low pressure) can enter the pressurizing device 11, which can pressurize the converter gas (low temperature and low pressure) and send it into the second regenerator 16 to absorb heat. The second regenerator 16 can release heat. When the converter gas enters the second regenerator 16 to release heat, the second regenerator 16 can store heat. The released converter gas (low temperature and low pressure) can enter the pressurizing device 11, which can pressurize the converter gas (low temperature and low pressure) and send it into the first regenerator 6 to absorb heat. The first regenerator 6 can release heat.

[0028] In the converter gas heat recovery and reuse system, the converter gas discharged from converter 1 alternately enters the first regenerator 6 and the second regenerator 16 to release heat. After releasing heat, the converter gas alternately enters the first regenerator 6 and the second regenerator 16 to absorb heat. The first regenerator 6 and the second regenerator 16 alternately are in a heat storage state and an heat release state. The first regenerator 6 and the second regenerator 16 have the same structure, which can ensure a continuous output of high-temperature converter gas. There is no vaporization cooling and evaporation cooling process, so the loss of waste heat of converter gas is small, which greatly improves the waste heat recovery and utilization efficiency of converter gas.

[0029] In addition, the converter gas heat recovery and reuse system may include two or more regenerators, each equipped with checker bricks or refractory balls as heat storage materials. Two regenerators can operate on a "one-regeneration-one-release" system; three regenerators can operate on a "two-regeneration-one-release" or "one-regeneration-two-release" system; and four regenerators can operate on a "two-regeneration-two-release" system. Each regenerator includes both "heat storage" and "heat release" states, which are switched via shut-off valves installed on the pipeline.

[0030] In this system, the high-temperature, low-pressure converter gas first passes through one or two regenerators in a "regenerative" state, where the waste heat of the converter gas is recovered by the regenerator's heat storage body, facilitating the pressurization of the generated low-temperature, low-pressure converter gas. Then, the low-temperature, high-pressure converter gas is introduced into one or two regenerators in an "exothermic" state, where it is heated. Ultimately, the system provides a continuous supply of high-temperature, high-pressure converter gas to the blast furnace.

[0031] At any given time, at least one regenerator is heating the low-temperature converter gas, providing the blast furnace with a continuous supply of high-temperature, high-pressure converter gas. The "heat release" time (the time for heating the low-temperature, high-pressure converter gas) of one regenerator can be one converter steelmaking cycle; or it can be an integer multiple of the converter steelmaking cycle.

[0032] In this embodiment, the gas pipeline includes a first high-temperature gas short pipe 5, a first high-temperature low-pressure gas inlet pipe 3, and a high-temperature low-pressure converter gas pipe 2 connected in sequence. One end of the first high-temperature gas short pipe 5 is connected to the first inlet and outlet of the first regenerator 6. The inlet end of the high-temperature low-pressure converter gas pipe 2 is connected to the converter 1. A first shut-off valve 4 is provided on the first high-temperature low-pressure gas inlet pipe 3.

[0033] In this embodiment, the gas transmission pipeline also includes a first high-temperature and high-pressure gas outlet pipe 28 and a high-temperature and high-pressure gas main pipe 20. The inlet end of the first high-temperature and high-pressure gas outlet pipe 28 is connected to the other end of the first high-temperature gas short pipe 5, the outlet end of the first high-temperature and high-pressure gas outlet pipe 28 is connected to the inlet end of the high-temperature and high-pressure gas main pipe 20, the outlet end of the high-temperature and high-pressure gas main pipe 20 is connected to the blast furnace 21, and a second shut-off valve 29 is provided on the first high-temperature and high-pressure gas outlet pipe 28.

[0034] A single smelting cycle in a converter steelmaking process takes approximately 30 minutes. Only the high-temperature converter gas is generated in the initial stage (0-12 minutes), followed by low-temperature air. Because the generation of converter gas is intermittent and discontinuous, to ensure a continuous supply of converter gas to the blast furnace after pressurization, the low-temperature gas pressurization device also includes a gas holder with a certain volume to store and recover the converter gas. In other words, the converter gas heat recovery and reuse system also includes a gas storage device 44. The volume of the gas storage device 44 can be determined according to engineering requirements; for example, the volume of the gas storage device 44 can be from 30,000 cubic meters to 150,000 cubic meters.

[0035] In this embodiment, the gas pipeline includes a first low-temperature gas short pipe 7, a first low-temperature low-pressure gas outlet pipe 8 and an input pipe 10 connected in sequence. One end of the first low-temperature gas short pipe 7 is connected to the second inlet and outlet of the first regenerator 6. The outlet end of the input pipe 10 is connected to the inlet end of the gas storage device 44. A third shut-off valve 9 is provided on the first low-temperature low-pressure gas outlet pipe 8.

[0036] In this embodiment, the gas pipeline also includes a first low-temperature high-pressure gas inlet pipe 27 and an outlet pipe 12. One end of the first low-temperature high-pressure gas inlet pipe 27 is connected to the other end of the first low-temperature gas short pipe 7, and the other end of the first low-temperature high-pressure gas inlet pipe 27 is connected to the outlet end of the outlet pipe 12. The inlet end of the outlet pipe 12 is connected to the outlet end of the gas storage device 44. The pressurizing device 11 is located on the outlet pipe 12, and a fourth shut-off valve 26 is provided on the first low-temperature high-pressure gas inlet pipe 27.

[0037] In this embodiment, the gas pipeline also includes a second high-temperature gas short pipe 17 and a second high-temperature low-pressure gas inlet pipe 22 connected in sequence. One end of the second high-temperature gas short pipe 17 is connected to the first inlet and outlet of the second regenerator 16, and the inlet end of the second high-temperature low-pressure gas inlet pipe 22 is connected to the outlet end of the high-temperature low-pressure converter gas pipeline 2. A fifth shut-off valve 23 is provided on the second high-temperature low-pressure gas inlet pipe 22.

[0038] In this embodiment, the gas pipeline also includes a second high-temperature and high-pressure gas outlet pipeline 18. The inlet end of the second high-temperature and high-pressure gas outlet pipeline 18 is connected to the other end of the second high-temperature gas short pipe 17, and the outlet end of the second high-temperature and high-pressure gas outlet pipeline 18 is connected to the inlet end of the high-temperature and high-pressure gas main pipe 20. A sixth shut-off valve 19 is provided on the second high-temperature and high-pressure gas outlet pipeline 18.

[0039] In this embodiment, the gas pipeline also includes a second low-temperature gas short pipe 15 and a second low-temperature low-pressure gas outlet pipe 25 connected in sequence. One end of the second low-temperature gas short pipe 15 is connected to the second inlet and outlet of the second regenerator 16, and the outlet end of the second low-temperature low-pressure gas outlet pipe 25 is connected to the inlet end of the input pipe 10. A seventh shut-off valve 24 is provided on the second low-temperature low-pressure gas outlet pipe 25.

[0040] In this embodiment, the gas pipeline also includes a second low-temperature high-pressure gas inlet pipe 14, one end of which is connected to the other end of a second low-temperature gas short pipe 15, and the other end of which is connected to the outlet end of the output pipe 12. An eighth shut-off valve 13 is provided on the second low-temperature high-pressure gas inlet pipe 14.

[0041] In this embodiment, both the first regenerator 6 and the second regenerator 16 can be hot air furnaces as used in the prior art. The first inlet and outlet of the first regenerator 6 are located at the upper part of the first regenerator 6, the second inlet and outlet of the first regenerator 6 are located at the lower part of the first regenerator 6, and the heat storage body 43 of the first regenerator 6 is located in the middle part of the first regenerator 6. Similarly, the first inlet and outlet of the second regenerator 16 are located at the upper part of the second regenerator 16, the second inlet and outlet of the second regenerator 16 are located at the lower part of the second regenerator 16, and the heat storage body 43 of the second regenerator 16 is located in the middle part of the second regenerator 16. Figure 3 As shown.

[0042] To ensure the reliable operation of the low-temperature gas pressurization device, the converter gas heat recovery and reuse system may also include a low-temperature gas dust removal device, which may be installed on the input pipeline 10; to improve the utilization rate of converter gas in the blast furnace, the low-temperature gas pressurization device may also include a purification device, which can treat the converter gas for deoxygenation, decarbonization, desulfurization, and denitrification.

[0043] In this system, the high-temperature, low-pressure converter gas discharged from converter 1 first passes through a regenerator, where the waste heat of the converter gas is recovered to facilitate the pressurization of the generated low-temperature, low-pressure converter gas. Then, the low-temperature, high-pressure converter gas is introduced into the regenerator for heating, ultimately providing a continuous supply of high-temperature, high-pressure converter gas to blast furnace 21. Because of the regenerator gas exchange process, two or more regenerators are required for normal operation, and each regenerator operates in two states: heat storage and heat release. At any given time, one regenerator is always heating the low-temperature converter gas, providing a continuous supply of high-temperature, high-pressure converter gas to blast furnace 21.

[0044] The working process of the converter gas heat recovery and reuse system is described below.

[0045] Step 1: The high-temperature, low-pressure converter gas generated during steelmaking in converter 1 passes through the high-temperature, low-pressure converter gas pipeline 2, the first high-temperature, low-pressure gas inlet pipeline 3, and the first shut-off valve 4, and then enters the first regenerator 6 via the first high-temperature gas short pipe 5. Inside the first regenerator 6, the high-temperature, dust-laden converter gas releases heat to below 200°C, heating the heat storage medium and trapping some of the dust in the converter gas. The low-temperature, low-pressure converter gas, now at 200°C, passes through the first low-temperature gas short pipe 7, the first low-temperature, low-pressure gas outlet pipeline 8, and the third shut-off valve 9 of the first regenerator 6, and then enters the gas storage device 44 via the input pipeline 10. After pressure stabilization and buffering, it enters the low-temperature gas pressurization device 11. The pressurized low-temperature, high-pressure converter gas, at 0.3MPa-0.5MPa, passes through the output pipeline 12, the second low-temperature, high-pressure gas inlet pipeline 14, and the eighth shut-off valve 13, and then enters the second regenerator 16 via the second low-temperature gas short pipe 15. While the regenerator in the second regenerator 16 is cooled, the converter gas can be heated to above 1350℃. At the same time, the dust trapped in the regenerator in the second regenerator 16 is also carried away by the gas. The high-temperature and high-pressure converter gas enters the high-temperature and high-pressure gas main pipe 20 leading to the blast furnace 21 through the second high-temperature gas short pipe 17, the second high-temperature and high-pressure gas outlet pipe 18, and the sixth shut-off valve 19, and is finally sent to the blast furnace 21.

[0046] Step 2: The high-temperature, low-pressure converter gas generated during steelmaking in converter 1 passes through high-temperature, low-pressure converter gas pipeline 2, the second high-temperature, low-pressure gas inlet pipeline 22, and the fifth shut-off valve 23, and then enters the second regenerator 16 via the second high-temperature gas short pipe 17. Inside the second regenerator 16, the high-temperature, dust-laden converter gas releases heat to below 200°C, heating the heat storage medium and trapping some of the dust in the converter gas. The low-temperature, low-pressure converter gas, now at 200°C, passes through the second low-temperature gas short pipe 15, the second low-temperature, low-pressure gas outlet pipeline 25, and the seventh shut-off valve 24, and then enters the gas storage device 44 via the input pipeline 10. After pressure stabilization and buffering, it enters the low-temperature gas pressurization device 11. The pressurized low-temperature, high-pressure converter gas, at 0.3MPa-0.5MPa, passes through the output pipeline 12, the first low-temperature, high-pressure gas inlet pipeline 27, and the fourth shut-off valve 26, and then enters the first regenerator 6 via the first low-temperature gas short pipe 7. While the regenerator in the first regenerator 6 is cooled, the converter gas can be heated to above 1350℃. At the same time, the dust trapped in the regenerator in the first regenerator 6 is also carried away by the gas. The high-temperature and high-pressure converter gas enters the high-temperature and high-pressure gas main pipe 20 leading to the blast furnace 21 through the first high-temperature gas short pipe 5, the first high-temperature and high-pressure gas outlet pipe 28, and the second shut-off valve 29, and is finally sent to the blast furnace 21.

[0047] Steps 1 and 2 above are repeated sequentially. While the first regenerator 6 absorbs waste heat from the high-temperature converter gas and stores heat in its regenerator body, the second regenerator 16 releases heat from its regenerator body to heat the low-temperature converter gas; or, while the first regenerator 6 releases heat from its regenerator body to heat the low-temperature converter gas, the second regenerator 16 absorbs waste heat from the high-temperature converter gas and stores heat in its regenerator body. At any given time, one regenerator is always heating the low-temperature, high-pressure converter gas, providing a continuous supply of high-temperature, high-pressure converter gas to the blast furnace 21.

[0048] This system can efficiently store the heat of high-temperature, low-pressure, dust-laden converter gas. After the converter gas is pressurized, most of the heat is returned to the converter gas, making it convenient for injection into the blast furnace. When the regenerator is in the "heat storage" state, it has a certain dust removal function for the high-temperature, low-pressure converter gas; when the regenerator is in the "heat release" state, the low-temperature, high-pressure converter gas is heated while also carrying away the dust trapped during the "heat storage" process.

[0049] A single steelmaking cycle in converter 1 takes approximately 30 minutes. High-temperature converter gas is only generated during the initial smelting phase (0-12 minutes), followed by low-temperature air. Taking a regenerator with the same "heat release time" as a single converter steelmaking cycle (30 minutes) as an example, because the converter gas generation time (0-12 minutes) is short within a single converter smelting cycle, the regenerator, in its "heat storage" state, has approximately 18 minutes left to use blast furnace gas for combustion after recovering the waste heat from the high-temperature, low-pressure converter gas. This further increases the accumulated heat in the regenerator, further raising the temperature of the high-temperature, high-pressure converter gas. Therefore, to ensure sufficient heat for heating the low-temperature, high-pressure converter gas, each regenerator not only absorbs the waste heat from the high-temperature converter gas but can also be equipped with ceramic burners or metal sleeve burners to supplement heat by burning converter gas, blast furnace gas, coke oven gas, or mixed gas, thereby obtaining even higher-temperature, high-pressure converter gas.

[0050] Specifically, both the first regenerator 6 and the second regenerator 16 are connected to a flue gas duct 40, a combustible gas supply duct 30, and a combustion air duct 36. The combustible gas supplied by the combustible gas supply duct 30 can burn and heat the regenerator 43, such as... Figure 2 As shown.

[0051] Along the direction from the inlet end to the outlet end of the combustible gas supply pipe 30, a first flow meter 31, a first regulating valve 32, a shut-off valve 33, and a first combustion valve 34 are sequentially installed on the combustible gas supply pipe 30. Along the direction from the inlet end to the outlet end of the combustion air pipe 36, a second flow meter 37, a second regulating valve 38, and a second combustion valve 39 are sequentially installed on the combustion air pipe 36. The outlet end of the flue gas exhaust pipe 40 is connected to a chimney 42, and a flue valve is installed on the flue gas exhaust pipe 40.

[0052] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used.

Claims

1. A system for recovering and reusing heat from converter gas, characterized by, The converter gas heat recovery and reuse system includes a first regenerator (6), a second regenerator (16) and a pressurizing device (11) connected by a gas transmission pipeline. The converter gas can alternately enter the first regenerator (6) and the second regenerator (16) to release heat. The converter gas heat recovery and reuse system also includes a gas storage device (44). The gas pipeline contains a first low-temperature gas short pipe (7), a first low-temperature low-pressure gas outlet pipe (8), and an input pipe (10) connected in sequence. One end of the first low-temperature gas short pipe (7) is connected to the second inlet and outlet of the first regenerator (6). The outlet end of the input pipe (10) is connected to the inlet end of the gas storage device (44). A third shut-off valve (9) is provided on the first low-temperature low-pressure gas outlet pipe (8). The gas pipeline also includes a first low-temperature high-pressure gas inlet pipe (27) and an outlet pipe (12). One end of the first low-temperature high-pressure gas inlet pipe (27) is connected to the other end of the first low-temperature gas short pipe (7), and the other end of the first low-temperature high-pressure gas inlet pipe (27) is connected to the outlet end of the outlet pipe (12). The inlet end of the outlet pipe (12) is connected to the outlet end of the gas storage device (44). The pressurizing device (11) is located on the outlet pipe (12). A fourth shut-off valve (26) is provided on the first low-temperature high-pressure gas inlet pipe (27). The gas pipeline also includes a second low-temperature gas short pipe (15) and a second low-temperature low-pressure gas outlet pipe (25) connected in sequence. One end of the second low-temperature gas short pipe (15) is connected to the second inlet and outlet of the second regenerator (16). The outlet end of the second low-temperature low-pressure gas outlet pipe (25) is connected to the inlet end of the input pipe (10). A seventh shut-off valve (24) is provided on the second low-temperature low-pressure gas outlet pipe (25). The gas pipeline also includes a second low-temperature high-pressure gas inlet pipe (14), one end of which is connected to the other end of the second low-temperature gas short pipe (15), and the other end of which is connected to the outlet end of the output pipe (12). An eighth shut-off valve (13) is provided on the second low-temperature high-pressure gas inlet pipe (14). During the process of the converter gas entering the first regenerator (6) to release heat, the first regenerator (6) can store heat. After the converter gas is released, it can first enter the gas storage device (44) through the first low temperature gas short pipe (7), the first low temperature and low pressure gas outlet pipe (8), the third shut-off valve (9) and the input pipe (10). After the converter gas is released, it can then enter the pressurizing device (11). The pressurizing device (11) can pressurize the converter gas and send it into the second regenerator (16) to absorb heat. The second regenerator (16) can release heat. During the process of the converter gas entering the second regenerator (16) to release heat, the second regenerator (16) can store heat. The converted gas after releasing heat can first enter the gas storage device (44) through the second low temperature gas short pipe (15), the second low temperature and low pressure gas outlet pipe (25), the seventh shut-off valve (24) and the input pipe (10). The converted gas after releasing heat can then enter the pressurizing device (11). The pressurizing device (11) can pressurize the converted gas and send it into the first regenerator (6) to absorb heat. The first regenerator (6) can release heat.

2. The system for recycling of the heat of the converter gas according to claim 1, characterized in that, The gas pipeline includes a first high-temperature gas short pipe (5), a first high-temperature low-pressure gas inlet pipe (3), and a high-temperature low-pressure converter gas pipe (2) connected in sequence. One end of the first high-temperature gas short pipe (5) is connected to the first inlet and outlet of the first regenerator (6). The inlet end of the high-temperature low-pressure converter gas pipe (2) is connected to the converter (1). A first shut-off valve (4) is installed on the first high-temperature low-pressure gas inlet pipe (3).

3. The system for recycling the heat of converter gas according to claim 2, characterized in that, The gas pipeline also includes a first high-temperature and high-pressure gas outlet pipeline (28) and a high-temperature and high-pressure gas main pipeline (20). The inlet end of the first high-temperature and high-pressure gas outlet pipeline (28) is connected to the other end of the first high-temperature gas short pipe (5). The outlet end of the first high-temperature and high-pressure gas outlet pipeline (28) is connected to the inlet end of the high-temperature and high-pressure gas main pipeline (20). The outlet end of the high-temperature and high-pressure gas main pipeline (20) is connected to the blast furnace (21). A second shut-off valve (29) is installed on the first high-temperature and high-pressure gas outlet pipeline (28).

4. The system for recycling of the heat of the converter gas according to claim 2, characterized in that, The gas pipeline also includes a second high-temperature gas short pipe (17) and a second high-temperature low-pressure gas inlet pipe (22) connected in sequence. One end of the second high-temperature gas short pipe (17) is connected to the first inlet and outlet of the second regenerator (16). The inlet end of the second high-temperature low-pressure gas inlet pipe (22) is connected to the outlet end of the high-temperature low-pressure converter gas pipe (2). A fifth shut-off valve (23) is provided on the second high-temperature low-pressure gas inlet pipe (22).

5. The system for recycling of the heat of the converter gas according to claim 1, characterized in that, The gas pipeline also includes a second high-temperature and high-pressure gas outlet pipeline (18), the inlet end of which is connected to the other end of the second high-temperature gas short pipe (17), the outlet end of which is connected to the inlet end of the high-temperature and high-pressure gas main pipe (20), and a sixth shut-off valve (19) is provided on the second high-temperature and high-pressure gas outlet pipeline (18).

6. The system for recycling of the heat of the converter gas according to claim 1, characterized in that, Both the first regenerator (6) and the second regenerator (16) are equipped with a heat storage body (43). Both the first regenerator (6) and the second regenerator (16) are connected to a flue pipe (40), a combustible gas supply pipe (30) and a combustion air pipe (36). The combustible gas supplied by the combustible gas supply pipe (30) can burn and heat the heat storage body (43).

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