Refined steel vacuum degassing system with double bag-type dust collectors

Abstract

A refined steel vacuum degassing system with double bag-type dust removers comprises a main vacuum bag-type dust remover group used for receiving gas output by a refining furnace and filtering steel ash and dust in the gas; gas filtered by the main vacuum bag-type dust collector group is input into a roots vacuum pump group to be compressed; the front vacuum bag-type dust collector group is connected with the roots vacuum pump group and is used for filtering residual steel ash and dust in gas output by the roots vacuum pump group; gas filtered by the front vacuum bag-type dust collector set is input into a front vacuum pump set, and the gas is output outwards by the front vacuum pump set.

Description

Technical Field

[0001] The present invention relates to a refined steel vacuum degassing system, and more particularly to a refined steel vacuum degassing system with a dual bag filter. Background Art

[0002] In the steelmaking system, the gases in the molten steel are mainly hydrogen and nitrogen. These gases are dissolved in the molten steel during the steelmaking process and will cause great harm to the properties of the steel. The hydrogen precipitated during the solidification of the molten steel will cause defects such as bubbles, white spots, hair cracks and ingot swelling in the steel. And the hydrogen that is not precipitated will reduce the ultimate strength, cross-sectional shrinkage rate, elongation and impact toughness of the steel. Nitrogen will cause the steel to age and embrittle, reduce the impact toughness of the steel, and cause cold brittleness of the steel. Therefore, the molten steel vacuum degassing technology is used in the steel manufacturing process. This technology can remove hydrogen and nitrogen from the molten steel under vacuum conditions.

[0003] Traditionally, a refined steel vacuum degassing system is mainly used to remove hydrogen and nitrogen from the molten steel. The system includes components such as a main bag filter, a main valve and a mechanical vacuum system. According to the gas transmission direction, the connection order of these components is as follows: a refining furnace (with a ladle placed therein), a main bag filter, a roots vacuum pump and a fore-vacuum pump. Various valves are also installed in the pipeline of the whole system. The above-mentioned main bag filter is arranged in front of the input end of the roots vacuum pump and is used to filter steel ash and dust. The flow rate design of the main bag filter must meet the volume flow rate value of the corresponding vacuum system at 67 Pa. When the mass flow vacuum degree is higher, the volume required for the main bag filter is larger. Therefore, the volume of the bag filter in the above traditional system is particularly large, the flow rate is particularly large, the number of bags required is quite large, and the floor area is also particularly large, resulting in a quite low space utilization efficiency. Moreover, the above system only uses the bag filter in front of the roots vacuum pump for single-time filtering of steel ash and dust, and the filtering effect is quite limited, which easily increases the proportion of unfiltered steel ash and dust entering the fore-vacuum pump. This situation is likely to cause serious failures to some dry-type fore-vacuum pumps. Summary of the Invention

[0004] Therefore, the object of the present invention is to solve the above problems in the prior art. In the present invention, a refined steel vacuum degassing system with a dual bag filter is proposed. The pre-stage bag filter unit is installed between the roots vacuum pump and the pre-stage vacuum pump of the refined steel vacuum degassing system. Since the roots vacuum pump can compress the gas volume, the pre-stage bag filter unit only needs to be equipped with a relatively small number of bags to meet the gas flow requirements. Therefore, its volume can be quite small, reducing the floor area. Moreover, since the roots vacuum pump can tolerate a certain amount of input dust, the main vacuum bag filter unit can also be adjusted to an appropriate volume according to the gas flow requirements. Therefore, the present invention can achieve excellent filtration effects at the same time, and the main vacuum bag filter unit and the pre-stage vacuum bag filter unit can have a relatively large volume adjustment range, achieving the maximum configuration flexibility and space utilization efficiency, which helps to reduce the cost of the entire system. In addition, the application of the main bag filter unit and the pre-stage vacuum bag filter unit can double-filter the gas from the refining furnace, achieving a better filtration effect, protecting the pre-stage vacuum pump from the dust in the input gas, preventing the pre-stage vacuum pump from being damaged, especially effectively protecting the pre-stage vacuum pump with a dry structure.

[0005] To achieve the above object, a refined steel vacuum degassing system with a dual bag filter is proposed in the present invention, which includes a main vacuum bag filter unit, including at least one main vacuum bag filter, a main dust removal input end and a main dust removal output end. The main dust removal input end is connected to a refining furnace containing molten steel; at least one main vacuum bag filter is used to receive the gas output from the refining furnace and filter the steel ash and dust in the gas, and the filtered gas is output outward from the main dust removal output end; a roots vacuum pump group, including at least one roots vacuum pump, a gas input end and a gas output end. The gas input end of the roots vacuum pump group is connected to the main dust removal output end of the main vacuum bag filter through an input pipeline; the gas filtered by the main vacuum bag filter unit is input into at least one roots vacuum pump through the input pipeline and the gas input end for compression, and the compressed gas is output outward from the gas output end; a pre-stage vacuum bag filter unit, including at least one pre-stage vacuum bag filter, a pre-stage dust removal input end and a pre-stage dust removal output end. The gas output end of the roots vacuum pump group is connected to the pre-stage dust removal input end through an output pipeline; at least one pre-stage vacuum bag filter is used to filter the residual steel ash and dust in the gas output by the roots vacuum pump group and output the filtered gas outward from the pre-stage dust removal output end; and a pre-stage vacuum pump group, including at least one pre-stage vacuum pump, a pre-stage input end and a pre-stage output end. The pre-stage input end of the pre-stage vacuum pump group is connected to the pre-stage dust removal output end of the pre-stage vacuum bag filter unit through a pre-stage pipeline. The gas filtered by the pre-stage vacuum bag filter unit is input into at least one pre-stage vacuum pump through the pre-stage pipeline, and these gases are output outward by at least one pre-stage vacuum pump.

[0006] A preferred solution is that the main vacuum bag filter is a bag filter, including at least one first filter bag, a first air inlet end and a first air outlet end. The first air inlet end is used to receive the gas input from the outside, and the first air outlet end is used to discharge the filtered gas.

[0007] A preferred solution is that each pre-vacuum bag filter is a bag filter, including at least one second filter bag, a second air inlet end and a second air outlet end. The second air inlet end is used to receive the gas output by the roots vacuum pump set, and the second air outlet end is used to discharge the filtered gas.

[0008] A preferred solution is that each pre-stage vacuum pump is a vacuum pump that can pump air under atmospheric pressure and directly discharge the pumped gas into the atmosphere.

[0009] A preferred solution is that there are at least multiple main vacuum bag filters; the multiple main vacuum bag filters are connected in series or in parallel; when the multiple main vacuum bag filters are connected in series, the corresponding first air inlet ends and first air outlet ends of two adjacent main vacuum bag filters are connected in series by a main dust removal pipeline; when the multiple main vacuum bag filters are connected in parallel, the first air inlet ends of the multiple main vacuum bag filters are connected in parallel to the main dust removal input end, and the first air outlet ends of the multiple main vacuum bag filters are connected in parallel to the main dust removal output end.

[0010] A preferred solution is that there are at least multiple roots vacuum pumps; each roots vacuum pump includes a third air inlet end and a third air outlet end. The third air inlet end is used to receive the gas input from the outside, and the third air outlet end is used to output the compressed gas; the multiple roots vacuum pumps are connected in series or in parallel; when the multiple roots vacuum pumps are connected in series, the corresponding third air inlet ends and third air outlet ends of two adjacent roots vacuum pumps are connected in series by a gas pipeline; when the multiple roots vacuum pumps are connected in parallel, the third air inlet ends of the multiple roots vacuum pumps are connected in parallel to the gas input end, and the third air outlet ends of the multiple roots vacuum pumps are connected in parallel to the gas output end.

[0011] A preferred solution is that there are at least multiple pre-vacuum bag filters; the multiple pre-vacuum bag filters are connected in series or in parallel; when the multiple pre-vacuum bag filters are connected in series, the corresponding second air inlet ends and second air outlet ends of two adjacent pre-vacuum bag filters are connected in series by a pre-dust removal pipeline; when the multiple pre-vacuum bag filters are connected in parallel, the second air inlet ends of the multiple pre-vacuum bag filters are connected in parallel to the pre-dust removal input end, and the second air outlet ends of the multiple pre-vacuum bag filters are connected in parallel to the pre-dust removal output end.

[0012] A preferred solution is that the at least one pre-stage vacuum pump is a plurality of pre-stage vacuum pumps; each pre-stage vacuum pump includes a fourth intake end and a fourth exhaust end, the fourth intake end is used to receive externally input gas, and the fourth exhaust end is used to output gas; the plurality of pre-stage vacuum pumps are connected in series or in parallel; when the plurality of pre-stage vacuum pumps are connected in series, the fourth intake ends and the fourth exhaust ends corresponding to two adjacent pre-stage vacuum pumps are connected in series by a suction pipeline; when the plurality of pre-stage vacuum pumps are connected in parallel, the fourth intake ends of the plurality of pre-stage vacuum pumps are connected in parallel to the pre-stage input end, and the fourth exhaust ends of the plurality of pre-stage vacuum pumps are connected in parallel to the pre-stage output end.

[0013] A preferred solution is that at least one control valve is installed in at least one of the main vacuum bag dust collector group, the input pipeline, the roots vacuum pump group, the output pipeline, the pre-stage vacuum bag dust collector group, the pre-stage pipeline and the pre-stage vacuum pump group to control the gas flow; each main vacuum bag dust collector and each pre-stage vacuum bag dust collector further includes at least one dust removal valve for controlling soot blowing, isolation and ash feeding.

[0014] A preferred solution is that it further includes a motor system connected to the roots vacuum pump group and the pre-stage vacuum pump group; the motor system includes at least one driving motor for controlling the operation of the roots vacuum pump group and the pre-stage vacuum pump group.

[0015] The features and advantages of the present invention can be further understood from the following description. Please refer to the accompanying drawings when reading. Description of the Drawings

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 Schematic diagram of the main components combination of the present invention; Figure 2 Connection architecture framework diagram of the main components of the present invention; Figure 3 Embodiment of the present invention; Figure 4 Another embodiment of the present invention.

[0018] Description of the Reference Numerals Refining furnace 1 Main vacuum bag dust collector group 10 Main dust collection input end 11 Main dust collection output end 12 Main vacuum bag dust collector 20 First intake end 21 First exhaust end 22 First cloth bag 23 Main dust collection pipeline 25 Roots vacuum pump set 30 Gas input end 31 Gas output end 32 Input pipeline 35 Output pipeline 36 Roots vacuum pump 40 Third intake end 41 Third exhaust end 42 Gas pipeline 45 Vacuum bag dust collector set 50 Pre - dust removal input end 51 Pre - dust removal output end 52 Pre - vacuum bag dust collector 60 Second intake end 61 Second exhaust end 62 Second cloth bag 63 Pre - dust removal pipeline 65 Pre - stage vacuum pump set 70 Pre - stage input end 71 Pre - stage output end 72 Pre - stage pipeline 75 Pre - stage vacuum pump 80 Fourth intake end 81 Fourth exhaust end 82 Suction pipeline 85 Control valve 90 Dust removal valve 95 Motor system 100 Drive motor 110. Specific implementation mode

[0019] With regard to the structural composition of the present invention, as well as the functions and advantages that can be achieved, in conjunction with the attached drawings, a preferred embodiment of the present invention will be described in detail as follows.

[0020] Please refer to Figures 1 to 4 As shown, the refined steel vacuum degassing system with a dual - bag dust collector of the present invention includes the following components: A main vacuum bag dust collector set 10, including at least one main vacuum bag dust collector 20, a main dust removal input end 11 and a main dust removal output end 12. The main dust removal input end 11 is connected to a refining furnace 1 containing molten steel. At least one main vacuum bag dust collector 20 is used to receive the gas output from the refining furnace 1 and filter the steel ash and dust in the gas. The filtered gas is output outward from the main dust removal output end 12. As Figure 1 And Figure 2As shown, the main vacuum bag filter 20 is a bag filter, including at least one first filter bag 23, a first air inlet end 21 and a first air outlet end 22. The first air inlet end 21 is used to receive the gas input from the outside, and the first air outlet end 22 is used to discharge the filtered gas.

[0021] A Roots vacuum pump group 30, including at least one Roots vacuum pump 40, a gas input end 31 and a gas output end 32. The gas input end 31 of the Roots vacuum pump group 30 is connected to the main dust removal output end 12 of the main vacuum bag filter 20 through an input pipeline 35. The gas filtered by the main vacuum bag filter group 10 is input into at least one Roots vacuum pump 40 through the input pipeline 35 and the gas input end 31 for compression, and the compressed gas is output outward from the gas output end 32. Each Roots vacuum pump 40 includes a third air inlet end 41 and a third air outlet end 42. The third air inlet end 41 is used to receive the gas input from the outside, and the third air outlet end 42 is used to output the compressed gas. Each Roots vacuum pump 40 can be any form of Roots vacuum pump, such as a two-lobe Roots vacuum pump, a three-lobe Roots vacuum pump, an air-cooled Roots vacuum pump, a water-cooled Roots vacuum pump, an air-cooled Roots vacuum pump, etc.

[0022] A pre-vacuum bag filter group 50, including at least one pre-vacuum bag filter 60, a pre-dust removal input end 51 and a pre-dust removal output end 52. The gas output end 32 of the Roots vacuum pump group 30 is connected to the pre-dust removal input end 51 through an output pipeline 36. At least one pre-vacuum bag filter 60 is used to filter the residual steel ash and dust in the gas output by the Roots vacuum pump group 30, and the filtered gas is output outward through the pre-dust removal output end 52. Each pre-vacuum bag filter 60 is a bag filter, including at least one second filter bag 63, a second air inlet end 61 and a second air outlet end 62. The second air inlet end 61 is used to receive the gas input from the outside, and the second air outlet end 62 is used to discharge the filtered gas.

[0023] A pre-stage vacuum pump group 70, including at least one pre-stage vacuum pump 80, a pre-stage input end 71 and a pre-stage output end 72. The pre-stage input end 71 of the pre-stage vacuum pump group 70 is connected to the pre-dust removal output end 52 of the pre-vacuum bag filter group 50 through a pre-stage pipeline 75. The gas filtered by the pre-vacuum bag filter group 50 is input into at least one pre-stage vacuum pump 80 through the pre-stage pipeline 75, and these gases are output outward by at least one pre-stage vacuum pump 80. Each pre-stage vacuum pump 80 includes a fourth air inlet end 81 and a fourth air outlet end 82. The fourth air inlet end 81 is used to receive the gas input from the outside, and the fourth air outlet end 82 is used to output the gas. Preferably, each pre-stage vacuum pump 80 is a vacuum pump that can pump air under atmospheric pressure and can directly discharge the pumped gas into the atmosphere, such as a liquid ring vacuum pump or a screw vacuum pump.

[0024] With the above structure, the refining furnace 1 can be evacuated to remove hydrogen and nitrogen in the molten steel, and the main vacuum bag dust collector group 10 and the pre-vacuum bag dust collector group 50 can filter the gas output from the refining furnace 1 twice, achieving a better double filtration effect to prevent steel ash and dust in the gas from damaging the front-stage vacuum pump group 70 at the rear end. Moreover, since the volume of the gas input to the pre-vacuum bag dust collector group 50 has been greatly reduced by the compression of the roots vacuum pump group 30, the gas flow rate requirement of at least one pre-vacuum bag dust collector 60 can be reduced. Therefore, at least one pre-vacuum bag dust collector 60 of the present invention only needs to be configured with a relatively small number of second filter bags 63 to meet the required gas flow rate. Therefore, the volume of at least one pre-vacuum bag dust collector 60 of the present invention can be quite small, and its floor area can be greatly reduced. And at least one main vacuum bag dust collector 20 can also be adjusted to an appropriate volume according to the gas flow rate requirement to cooperate with at least one pre-vacuum bag dust collector 60 to meet the required filtration requirement.

[0025] At least one of the main vacuum bag dust collector group 10, the input pipeline 35, the roots vacuum pump group 30, the output pipeline 36, the pre-vacuum bag dust collector group 50, the front-stage pipeline 75, and the front-stage vacuum pump group 70 is equipped with at least one control valve 90 to control the gas flow rate. Figure 1 It is shown that the input pipeline 35, the output pipeline 36, and the front-stage pipeline 75 are respectively equipped with corresponding control valves 90. Each main vacuum bag dust collector 20 and each pre-vacuum bag dust collector 60 further include at least one dust removal valve 95 for controlling functions such as soot blowing, isolation, and ash feeding.

[0026] As Figure 1 shown, where at least one main vacuum bag dust collector 20 can be one main vacuum bag dust collector 20, as Figure 3 and Figure 4 shown, at least one main vacuum bag dust collector 20 can be multiple main vacuum bag dust collectors 20. The multiple main vacuum bag dust collectors 20 can be connected in series or in parallel. As Figure 3 shown, when the multiple main vacuum bag dust collectors 20 are connected in series, the corresponding first intake ends 21 and first exhaust ends 22 of two adjacent main vacuum bag dust collectors 20 are connected in series by the main dust removal pipeline 25, and corresponding control valves 90 can be provided on the main dust removal pipeline 25 to control the gas flow rate. As Figure 4 shown, when the multiple main vacuum bag dust collectors 20 are connected in parallel, the first intake ends 21 of the multiple main vacuum bag dust collectors 20 are connected in parallel to the main dust removal input end 11, and the first exhaust ends 22 of the multiple main vacuum bag dust collectors 20 are connected in parallel to the main dust removal output end 12.

[0027] As Figure 1 shown, where the at least one Roots vacuum pump 40 can be one Roots vacuum pump 40, as Figure 3 and Figure 4 shown, the at least one Roots vacuum pump 40 can be multiple Roots vacuum pumps 40. The multiple Roots vacuum pumps 40 can be connected in series or in parallel. As Figure 3 shown, when the multiple Roots vacuum pumps 40 are connected in series, the third intake ends 41 and the third exhaust ends 42 corresponding to two adjacent Roots vacuum pumps 40 are connected in series by a gas pipeline 45, and a corresponding control valve 90 can be arranged on the gas pipeline 45 to control the gas flow rate. As Figure 4 shown, when the multiple Roots vacuum pumps 40 are connected in parallel, the third intake ends 41 of the multiple Roots vacuum pumps 40 are connected in parallel to the gas input end 31, and the third exhaust ends 42 of the multiple Roots vacuum pumps 40 are connected in parallel to the gas output end 32.

[0028] As Figure 1 shown, where the at least one pre-vacuum bag filter 60 can be one pre-vacuum bag filter 60, as Figure 3 and Figure 4 shown, the at least one pre-vacuum bag filter 60 can be multiple pre-vacuum bag filters 60. The multiple pre-vacuum bag filters 60 can be connected in series or in parallel. As Figure 3 shown, when the multiple pre-vacuum bag filters 60 are connected in series, the second intake ends 61 and the second exhaust ends 62 corresponding to two adjacent pre-vacuum bag filters 60 are connected in series by a pre-dust removal pipeline 65, and a corresponding control valve 90 can be arranged on the pre-dust removal pipeline 65 to control the gas flow rate. As Figure 4 shown, when the multiple pre-vacuum bag filters 60 are connected in parallel, the second intake ends 61 of the multiple pre-vacuum bag filters 60 are connected in parallel to the pre-dust removal input end 51, and the second exhaust ends 62 of the multiple pre-vacuum bag filters 60 are connected in parallel to the pre-dust removal output end 52.

[0029] As Figure 1 shown, where the at least one fore-vacuum pump 80 can be one fore-vacuum pump 80, as Figure 3 and Figure 4 shown, the at least one fore-vacuum pump 80 can be multiple fore-vacuum pumps 80. The multiple fore-vacuum pumps 80 can be connected in series or in parallel. As Figure 3 shown, when the multiple fore-vacuum pumps 80 are connected in series, the fourth intake ends 81 and the fourth exhaust ends 82 corresponding to two adjacent fore-vacuum pumps 80 are connected in series by a suction pipeline 85, and a corresponding control valve 90 can be arranged on the suction pipeline 85 to control the gas flow rate. As Figure 4As shown, when the multiple fore-vacuum pumps 80 are connected in parallel, the fourth intake ends 81 of the multiple fore-vacuum pumps 80 are connected in parallel to the fore-intake end 71, and the fourth exhaust ends 82 of the multiple fore-vacuum pumps 80 are connected in parallel to the fore-exhaust end 72.

[0030] The above Figure 3 and Figure 4 The embodiments do not limit the scope of the present invention. In actual applications, the multiple main vacuum bag filters 20, the multiple roots vacuum pumps 40, the multiple pre-vacuum bag filters 60, and the multiple fore-vacuum pumps 80 can be formed into different series or parallel structures respectively to enable the entire system to achieve the maximum filtration effect and degassing efficiency.

[0031] A motor system 100 is connected to the roots vacuum pump group 30 and the fore-vacuum pump group 70. The motor system 100 includes at least one driving motor 110 for controlling the operation of the roots vacuum pump group 30 and the fore-vacuum pump group 70. The motor system 100 is also used to control the above-mentioned control valves 90.

[0032] The advantages of the present invention are that the pre-bag filter group is installed between the roots vacuum pump and the fore-vacuum pump of the refining steel vacuum degassing system. Since the roots vacuum pump can compress the gas volume, the pre-bag filter group only needs to be configured with a relatively small number of bags to meet the gas flow requirements. Therefore, its volume can be quite small, reducing the floor area. Moreover, since the roots vacuum pump can tolerate a certain amount of input dust, the main vacuum bag filter group can also be adjusted to an appropriate volume according to the gas flow requirements. Therefore, the present invention can not only achieve excellent filtration effects, but also enable the main vacuum bag filter group and the pre-bag filter group to have a relatively large volume adjustment range, achieving the maximum configuration flexibility and space utilization efficiency, which helps to reduce the cost of the entire system. In addition, the application of the main bag filter group and the pre-vacuum bag filter group can double-filter the gas from the refining furnace to achieve a better filtration effect, protect the fore-vacuum pump from the dust in the input gas, and prevent the fore-vacuum pump from being damaged. In particular, it can effectively protect the fore-vacuum pump with a dry structure.

[0033] The above detailed description is a specific description of a feasible embodiment of the present invention, but this embodiment is not used to limit the patent scope of the present invention. Any equivalent implementation or modification without departing from the technical spirit of the present invention should be included in the patent scope of the present invention.

Claims

1. A refined steel vacuum degassing system with a dual bag filter dust collector, characterized in that, it includes: A main vacuum bag filter dust collector group, including at least one main vacuum bag filter dust collector, a main dust collection input end and a main dust collection output end, and the main dust collection input end is connected to a refining furnace containing molten steel; At least one main vacuum bag filter dust collector is used to receive the gas output from the refining furnace and filter the steel ash and dust in the gas, and the filtered gas is output outward from the main dust collection output end; A Roots vacuum pump group, including at least one Roots vacuum pump, a gas input end and a gas output end, and the gas input end of the Roots vacuum pump group is connected to the main dust collection output end of the main vacuum bag filter dust collector through an input pipeline; the gas filtered by the main vacuum bag filter dust collector group is input into at least one Roots vacuum pump through the input pipeline and the gas input end for compression, and the compressed gas is output outward from the gas output end; A pre-vacuum bag filter dust collector group, including at least one pre-vacuum bag filter dust collector, a pre-dust collection input end and a pre-dust collection output end, and the gas output end of the Roots vacuum pump group is connected to the pre-dust collection input end through an output pipeline; at least one pre-vacuum bag filter dust collector is used to filter the residual steel ash and dust in the gas output by the Roots vacuum pump group and output the filtered gas outward through the pre-dust collection output end; and A front-stage vacuum pump group, including at least one front-stage vacuum pump, a front-stage input end and a front-stage output end, and the front-stage input end of the front-stage vacuum pump group is connected to the pre-dust collection output end of the pre-vacuum bag filter dust collector group through a front-stage pipeline, and the gas filtered by the pre-vacuum bag filter dust collector group is input into at least one front-stage vacuum pump through the front-stage pipeline, and these gases are output outward by at least one front-stage vacuum pump.

2. The refined steel vacuum degassing system with a dual bag filter dust collector according to claim 1, characterized in that, The main vacuum bag filter dust collector is a bag filter dust collector, including at least one first bag, a first air inlet end and a first exhaust end, the first air inlet end is used to receive the externally input gas, and the first exhaust end is used to discharge the filtered gas.

3. The refined steel vacuum degassing system with a dual bag filter dust collector according to claim 1, characterized in that, Each pre-vacuum bag filter dust collector is a bag filter dust collector, including at least one second bag, a second air inlet end and a second exhaust end, the second air inlet end is used to receive the gas output by the Roots vacuum pump group, and the second exhaust end is used to discharge the filtered gas.

4. The refined steel vacuum degassing system with a dual bag filter dust collector according to claim 1, characterized in that, Each front-stage vacuum pump is a vacuum pump that can pump air under atmospheric pressure and directly discharge the pumped gas into the atmosphere.

5. The refined steel vacuum degassing system with a dual bag filter dust collector according to claim 2, characterized in that, At least one main vacuum bag filter is multiple main vacuum bag filters; the multiple main vacuum bag filters are connected in series or in parallel; when the multiple main vacuum bag filters are connected in series, the first intake ends and the first exhaust ends corresponding to two adjacent main vacuum bag filters are connected in series by a main dust removal pipeline; when the multiple main vacuum bag filters are connected in parallel, the first intake ends of the multiple main vacuum bag filters are connected in parallel to the main dust removal input end, and the first exhaust ends of the multiple main vacuum bag filters are connected in parallel to the main dust removal output end.

6. The refined steel vacuum degassing system with a dual bag filter as claimed in claim 1, characterized in that, at least one Roots vacuum pump is multiple Roots vacuum pumps; each Roots vacuum pump includes a third intake end and a third exhaust end, the third intake end is used to receive externally input gas, and the third exhaust end is used to output compressed gas; the multiple Roots vacuum pumps are connected in series or in parallel; when the multiple Roots vacuum pumps are connected in series, the third intake ends and the third exhaust ends corresponding to two adjacent Roots vacuum pumps are connected in series by a gas pipeline; when the multiple Roots vacuum pumps are connected in parallel, the third intake ends of the multiple Roots vacuum pumps are connected in parallel to the gas input end, and the third exhaust ends of the multiple Roots vacuum pumps are connected in parallel to the gas output end.

7. The refined steel vacuum degassing system with a dual bag filter as claimed in claim 3, characterized in that, at least one pre-vacuum bag filter is multiple pre-vacuum bag filters; the multiple pre-vacuum bag filters are connected in series or in parallel; when the multiple pre-vacuum bag filters are connected in series, the second intake ends and the second exhaust ends corresponding to two adjacent pre-vacuum bag filters are connected in series by a pre-dust removal pipeline; when the multiple pre-vacuum bag filters are connected in parallel, the second intake ends of the multiple pre-vacuum bag filters are connected in parallel to the pre-dust removal input end, and the second exhaust ends of the multiple pre-vacuum bag filters are connected in parallel to the pre-dust removal output end.

8. The refined steel vacuum degassing system with a dual bag filter as claimed in claim 1, characterized in that, the at least one pre-stage vacuum pump is multiple pre-stage vacuum pumps; each pre-stage vacuum pump includes a fourth intake end and a fourth exhaust end, the fourth intake end is used to receive externally input gas, and the fourth exhaust end is used to output gas; the multiple pre-stage vacuum pumps are connected in series or in parallel; when the multiple pre-stage vacuum pumps are connected in series, the fourth intake ends and the fourth exhaust ends corresponding to two adjacent pre-stage vacuum pumps are connected in series by a suction pipeline; when the multiple pre-stage vacuum pumps are connected in parallel, the fourth intake ends of the multiple pre-stage vacuum pumps are connected in parallel to the pre-stage input end, and the fourth exhaust ends of the multiple pre-stage vacuum pumps are connected in parallel to the pre-stage output end.

9. The refined steel vacuum degassing system with a dual bag filter as claimed in claim 1, characterized in that, At least one control valve is installed in at least one of the main vacuum bag dust collector group, the input pipeline, the roots vacuum pump group, the output pipeline, the pre-vacuum bag dust collector group, the pre-stage pipeline and the pre-stage vacuum pump group to control the gas flow rate; each main vacuum bag dust collector and each pre-vacuum bag dust collector further includes at least one dust removal valve for controlling soot blowing, isolation and ash feeding.

10. The refined steel vacuum degassing system with a dual bag dust collector according to claim 1, characterized in that it further includes a motor system connected to the roots vacuum pump group and the pre-stage vacuum pump group; the motor system includes at least one driving motor for controlling the operation of the roots vacuum pump group and the pre-stage vacuum pump group.

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