Final screw pump for vacuum refining facility with cooling and explosion-proof structure

Abstract

The present invention is a final stage screw pump of a vacuum refining facility provided with a cooling and explosion-proof structure, comprising a final stage screw pump body connected in series to a vacuum pipeline, the final stage screw pump body is also connected to a cooling and explosion-proof structure, the cooling and explosion-proof structure comprises an air input pipeline and a carbon dioxide input pipeline arranged in parallel, the outlet of the air input pipeline or the outlet of the air input pipeline is connected to the final stage screw pump body, the air input pipeline can convey air to the final stage screw pump body and the vacuum pipeline to cool the final stage screw pump body, and the carbon dioxide input pipeline can convey carbon dioxide gas to the final stage screw pump body and the vacuum pipeline to play a cooling and explosion-proof role. The present invention can effectively utilize carbon dioxide and reduce carbon dioxide emissions, and plays a beneficial role in reducing greenhouse gas emissions and improving the living environment.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum refining in the steel smelting industry, and in particular to a final-stage screw pump of a vacuum refining facility provided with a cooling and explosion-proof structure. Background Art

[0002] With the increasing global energy shortage and climate warming, greenhouse gas emissions, mainly carbon dioxide, have become a matter of great concern to the whole society. The global climate change caused by the emission of greenhouse gases such as carbon dioxide has brought complex impacts on global agriculture, water resources, ecosystems, human health, society and human living environment.

[0003] In the steel smelting industry, relevant research has been conducted on the recycling of carbon dioxide in multiple processes such as electric furnaces, converters, and refining to reduce carbon dioxide emissions.

[0004] During the oxygen blowing smelting process in vacuum refining facilities, a gas containing a large amount of carbon monoxide will be produced, and the final screw pump will also generate a lot of heat during operation. Therefore, the final screw pump of the mechanical vacuum pump system needs to be injected with inert gas for cooling and explosion prevention.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a final-stage screw pump for a vacuum refining facility with a cooling and explosion-proof structure to reduce carbon dioxide emissions during the oxygen blowing smelting process of the vacuum refining facility. Summary of the invention

[0006] The purpose of the present invention is to provide a final-stage screw pump for a vacuum refining facility with a cooling and explosion-proof structure. The present invention can effectively utilize carbon dioxide and reduce carbon dioxide emissions, and play a beneficial role in reducing greenhouse gas emissions and improving the living environment.

[0007] The object of the present invention is achieved in this way. A final-stage screw pump of a vacuum refining facility is provided with a cooling and explosion-proof structure, including a final-stage screw pump body connected in series to a vacuum pipeline, the final-stage screw pump body is also connected to a cooling and explosion-proof structure, the cooling and explosion-proof structure includes an air input pipeline and a carbon dioxide input pipeline arranged in parallel, the outlet of the air input pipeline or the outlet of the air input pipeline is connected to the final-stage screw pump body, the air input pipeline can transport air to the final-stage screw pump body and the vacuum pipeline to cool the final-stage screw pump body, and the carbon dioxide input pipeline can transport carbon dioxide gas to the final-stage screw pump body and the vacuum pipeline to play a cooling and explosion-proof role.

[0008] In a preferred embodiment of the present invention, a first flow meter, a first thermometer and a first pressure gauge are connected in series on the air input pipeline, and a first switch valve for controlling on and off is also provided on the air input pipeline.

[0009] In a preferred embodiment of the present invention, a second flow meter, a second thermometer and a second pressure gauge are connected in series on the carbon dioxide input pipeline, and a second switch valve for on-off control is also provided on the carbon dioxide input pipeline.

[0010] In a preferred embodiment of the present invention, the inlet of the air input pipeline is connected to the atmosphere.

[0011] In a preferred embodiment of the present invention, the inlet of the carbon dioxide input pipeline is connected to the carbon dioxide storage tank.

[0012] In a preferred embodiment of the present invention, the inlet of the carbon dioxide input pipeline is connected to the workshop pipeline network.

[0013] In a preferred embodiment of the present invention, a second flow meter, a second thermometer and a second pressure gauge are connected in series on the carbon dioxide input pipeline, and a second switch valve for on-off control is also provided on the carbon dioxide input pipeline.

[0014] In a preferred embodiment of the present invention, the inlet of the carbon dioxide input pipeline is connected to the carbon dioxide storage tank or the workshop pipeline network.

[0015] In a preferred embodiment of the present invention, a first inlet, a second inlet and a first outlet are provided on the final-stage screw pump body, the first inlet and the first outlet are connected in series to a vacuum pipeline, and the outlet of the air input pipeline and the outlet of the carbon dioxide input pipeline can be connected to the second inlet.

[0016] In a preferred embodiment of the present invention, the vacuum pipeline is provided with a third flow meter, a third thermometer, a third pressure gauge and a third control valve at the first inlet, and the vacuum pipeline is provided with a fourth flow meter, a fourth thermometer, a fourth pressure gauge and a fourth control valve at the first outlet.

[0017] As described above, the object of the present invention is to provide a final screw pump of a vacuum refining facility with a cooling and explosion-proof structure, which has the following beneficial effects:

[0018] The final stage screw pump of the vacuum refining facility provided with a cooling and explosion-proof structure provided by the present invention is connected and provided with the cooling and explosion-proof structure, and the cooling and explosion-proof structure comprises an air input pipeline and a carbon dioxide input pipeline, the air input pipeline can convey air to the final stage screw pump body and the vacuum pipeline to play a cooling role; the carbon dioxide input pipeline can convey carbon dioxide gas to the final stage screw pump body and the vacuum pipeline to play a cooling role, and at the same time, the carbon dioxide can dilute the carbon monoxide in the vacuum pipeline to play an explosion-proof role;

[0019] The carbon dioxide gas is sucked into the vacuum pipeline, which can effectively utilize the carbon dioxide gas and reduce carbon dioxide emissions, playing a beneficial role in improving the environment;

[0020] The cost of carbon dioxide gas is lower than that of inert gases such as nitrogen and argon. Using carbon dioxide gas for cooling and explosion protection can reduce the smelting cost of the vacuum refining process in steel smelting and improve the economic benefits of steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0022] in:

[0023] Figure 1 : It is a schematic diagram of the final stage screw pump of the vacuum refining facility provided with cooling and explosion-proof structure of the present invention.

[0024] In the figure:

[0025] 100. The final screw pump of the vacuum refining facility is equipped with cooling and explosion-proof structure;

[0026] 1. Final screw pump body; 11. First inlet; 12. Second inlet; 13. First outlet;

[0027] 2. Cooling and explosion-proof structure; 21. Air input pipeline; 22. Carbon dioxide input pipeline;

[0028] 3. Vacuum pipeline;

[0029] 41. a first flow meter; 42. a second flow meter; 43. a third flow meter; 44. a fourth flow meter;

[0030] 51. first thermometer; 52. second thermometer; 53. third thermometer; 54. fourth thermometer;

[0031] 61. First pressure gauge; 62. Second pressure gauge; 63. Third pressure gauge; 64. Fourth pressure gauge;

[0032] 71. First switch valve; 72. Second switch valve; 73. Third control valve; 74. Fourth control valve. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0034] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] like Figure 1 As shown, the present invention provides a final-stage screw pump 100 of a vacuum refining facility provided with a cooling and explosion-proof structure. The vacuum refining facility mainly includes steelmaking and refining facilities that require vacuuming, such as RH vacuum refining furnace, VD vacuum refining furnace, and VOD vacuum refining furnace. The vacuum refining facility is connected to a vacuum pipeline, and the final-stage screw pump is connected to the vacuum pipeline. The working stages of the vacuum refining facility include a non-oxygen blowing smelting stage and an oxygen blowing smelting stage. In the non-oxygen blowing smelting stage, the vacuum pipeline does not contain carbon monoxide gas, and in the oxygen blowing smelting stage, the vacuum pipeline contains carbon monoxide gas (existing technology).

[0037] The present invention comprises a final-stage screw pump body 1 connected in series to a vacuum pipeline 3, and a cooling and explosion-proof structure 2 is also connected to the final-stage screw pump body 1, and the cooling and explosion-proof structure 2 comprises an air input pipeline 21 and a carbon dioxide input pipeline 22 arranged in parallel, and the outlet of the air input pipeline 21 or the outlet of the air input pipeline 21 is connected to the final-stage screw pump body 1, and the air input pipeline 21 can transport air to the final-stage screw pump body 1 and the vacuum pipeline 3 to cool the final-stage screw pump body 1. In the non-oxygen blowing smelting stage of the vacuum refining facility, since the vacuum pipeline does not contain carbon monoxide, there is no risk of explosion caused by the combination of oxygen and carbon monoxide, and air is transported to the final-stage screw pump body 1 and the vacuum pipeline 3 through the air input pipeline 21, and the final-stage screw pump body 1 is cooled by air; in the oxygen blowing smelting stage of the vacuum refining facility, since a large amount of carbon monoxide exists in the vacuum pipeline, in order to avoid the combination of oxygen and carbon monoxide to cause an explosion, the air input pipeline 21 is in a closed state;

[0038] The carbon dioxide input pipeline 22 can transport carbon dioxide gas to the final-stage screw pump body 1 and the vacuum pipeline 3 to play a cooling and explosion-proof role. During the oxygen blowing smelting stage of the vacuum refining facility, due to the presence of a large amount of carbon monoxide in the vacuum pipeline, in order to avoid the explosion caused by the combination of oxygen and carbon monoxide, carbon dioxide gas is transported to the final-stage screw pump body 1 and the vacuum pipeline 3 through the carbon dioxide input pipeline 22. The carbon dioxide gas is used to cool the final-stage screw pump body 1 and dilute the carbon monoxide in the vacuum pipeline, thereby playing a cooling and explosion-proof role.

[0039] The final-stage screw pump of the vacuum refining facility provided by the present invention is provided with a cooling and explosion-proof structure, and the cooling and explosion-proof structure is connected and arranged. The cooling and explosion-proof structure comprises an air input pipeline and a carbon dioxide input pipeline. The air input pipeline can convey air to the final-stage screw pump body and the vacuum pipeline to play a cooling role; the carbon dioxide input pipeline can convey carbon dioxide gas to the final-stage screw pump body and the vacuum pipeline to play a cooling role, and at the same time, carbon dioxide can dilute carbon monoxide in the vacuum pipeline to play an explosion-proof role. The carbon dioxide gas is sucked into the vacuum pipeline, and the carbon dioxide gas can be effectively utilized and carbon dioxide emissions can be reduced, which plays a beneficial role in improving the environment; the cost of carbon dioxide gas is lower than that of inert gases such as nitrogen and argon. Using carbon dioxide gas for cooling and explosion-proofing can reduce the smelting cost of the vacuum refining process of steel smelting and improve the economic benefits of steel enterprises.

[0040] Further, if Figure 1As shown, the air input pipeline 21 is connected in series with a first flow meter 41, a first thermometer 51 and a first pressure gauge 61. The first flow meter 41, the first thermometer 51 and the first pressure gauge 61 can monitor and feedback the flow, temperature and pressure parameters of the air input pipeline 21 respectively, and the types of instruments can be adjusted according to actual needs. A first switch valve 71 for controlling the on-off is also provided on the air input pipeline 21. In the non-oxygen blowing smelting stage of the vacuum refining facility, the first switch valve 71 is in an open state, the air input pipeline 21 is connected to the final screw pump body 1, and the air cools the final screw pump body 1; in the oxygen blowing smelting stage of the vacuum refining facility, the first switch valve 71 is in a closed state.

[0041] In this embodiment, the inlet of the air input pipeline 21 is connected to the atmosphere. In the oxygen blowing smelting stage of the vacuum refining facility, there is a large amount of carbon monoxide in the vacuum pipeline, and the air in the atmosphere contains oxygen. In order to avoid the combination of oxygen and carbon monoxide to cause an explosion, the air input pipeline 21 is disconnected from the final screw pump body 1; in the non-oxygen blowing smelting stage of the vacuum refining facility, there is no carbon monoxide in the vacuum pipeline, the first switch valve 71 is in an open state, the air input pipeline 21 is connected to the final screw pump body 1, and the air cools the final screw pump body 1.

[0042] Further, if Figure 1 As shown, the carbon dioxide input pipeline 22 is connected in series with a second flow meter 42, a second thermometer 52 and a second pressure gauge 62. The second flow meter 42, the second thermometer 52 and the second pressure gauge 62 can monitor and feedback the flow, temperature and pressure parameters of the carbon dioxide input pipeline 22 respectively, and the type of the instrument can be adjusted according to actual needs. A second switch valve 72 for controlling the on-off is also provided on the carbon dioxide input pipeline 22. During the oxygen blowing smelting stage of the vacuum refining facility, due to the presence of a large amount of carbon monoxide in the vacuum pipeline, in order to avoid the combination of oxygen and carbon monoxide to cause an explosion, the air input pipeline 21 is disconnected from the final screw pump body 1, and the second switch valve 72 is in an open state. The carbon dioxide input pipeline 22 is connected to the final screw pump body 1, and the carbon dioxide gas cools the final screw pump body 1 and dilutes the carbon monoxide in the vacuum pipeline, playing a cooling and explosion-proof role.

[0043] In this embodiment, the inlet of the carbon dioxide input pipeline 22 is connected to the carbon dioxide gas storage tank or the workshop pipeline network. The carbon dioxide gas from the gas storage tank or the workshop pipeline network can enter the vacuum pipeline 3 through the carbon dioxide input pipeline 22 and the final screw pump body 1. The carbon dioxide gas generated by the workshop production is no longer directly discharged, but enters the final screw pump body 1 and the vacuum pipeline 3, which effectively utilizes carbon dioxide and reduces carbon dioxide emissions, which plays a beneficial role in improving the environment.

[0044] Further, if Figure 1As shown, a first inlet 11, a second inlet 12 and a first outlet 13 are provided on the final-stage screw pump body 1. The first inlet 11 and the first outlet 13 are connected in series to the vacuum pipeline 3, and the outlets of the air input pipeline 21 and the carbon dioxide input pipeline 22 can be connected to the second inlet 12.

[0045] Further, if Figure 1 As shown, the vacuum pipeline 3 is provided with a third flow meter 43, a third thermometer 53, a third pressure gauge 63 and a third control valve 73 at the first inlet 11. The third flow meter 43, the third thermometer 53 and the third pressure gauge 63 monitor and feedback the flow, temperature and pressure parameters of the vacuum pipeline 3 before the first inlet 11 of the final screw pump body 1. The types of instruments can be adjusted according to actual needs.

[0046] The vacuum pipeline 3 is provided with a fourth flow meter 44, a fourth thermometer 54, a fourth pressure gauge 64 and a fourth control valve 74 at the first outlet 13. The fourth flow meter 44, the fourth thermometer 54 and the fourth pressure gauge 64 monitor and feedback the flow, temperature and pressure parameters of the vacuum pipeline 3 after the first outlet 13 of the final screw pump body 1, and the types of instruments can be adjusted according to actual needs.

[0047] The working process of the final screw pump 100 of the vacuum refining facility provided with cooling and explosion-proof structure of the present invention is as follows:

[0048] When the vacuum refining facility performs non-oxygen blowing smelting, since there is no carbon monoxide in the vacuum pipeline, there is no risk of explosion caused by the combination of oxygen and carbon monoxide, the second switch valve 72 is closed (the carbon dioxide input pipeline 22 is disconnected), the first switch valve 71 is opened, and the air input pipeline 21 transports air to the final screw pump body 1 and the vacuum pipeline 3, and the air cools the final screw pump body 1 and the vacuum pipeline 3;

[0049] When the vacuum refining facility carries out oxygen blowing smelting, a large amount of carbon monoxide exists in the vacuum pipeline 3. In order to avoid explosion caused by the combination of oxygen and carbon monoxide, the air input pipeline 21 is disconnected from the final screw pump body 1, and the second switch valve 72 is in an open state. The carbon dioxide input pipeline 22 is connected to the final screw pump body 1. The carbon dioxide gas cools the final screw pump body 1 and the vacuum pipeline 3, and dilutes the carbon monoxide in the vacuum pipeline, thereby playing a cooling and explosion-proof role.

[0050] As described above, the object of the present invention is to provide a final screw pump of a vacuum refining facility with a cooling and explosion-proof structure, which has the following beneficial effects:

[0051] The final stage screw pump of the vacuum refining facility provided with a cooling and explosion-proof structure provided by the present invention is connected and provided with the cooling and explosion-proof structure, and the cooling and explosion-proof structure comprises an air input pipeline and a carbon dioxide input pipeline, the air input pipeline can convey air to the final stage screw pump body and the vacuum pipeline to play a cooling role; the carbon dioxide input pipeline can convey carbon dioxide gas to the final stage screw pump body and the vacuum pipeline to play a cooling role, and at the same time, the carbon dioxide can dilute the carbon monoxide in the vacuum pipeline to play an explosion-proof role;

[0052] The carbon dioxide gas is sucked into the vacuum pipeline, which can effectively utilize the carbon dioxide gas and reduce carbon dioxide emissions, playing a beneficial role in improving the environment;

[0053] The cost of carbon dioxide gas is lower than that of inert gases such as nitrogen and argon. Using carbon dioxide gas for cooling and explosion protection can reduce the smelting cost of the vacuum refining process in steel smelting and improve the economic benefits of steel enterprises.

[0054] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A final screw pump for vacuum refining facilities with cooling and explosion-proof structure, characterized in that: It includes a final-stage screw pump body connected in series to a vacuum pipeline, the final-stage screw pump body is also connected to a cooling and explosion-proof structure, the cooling and explosion-proof structure includes an air input pipeline and a carbon dioxide input pipeline arranged in parallel, the outlet of the air input pipeline or the outlet of the air input pipeline is connected to the final-stage screw pump body, the air input pipeline can transport air to the final-stage screw pump body and the vacuum pipeline to cool the final-stage screw pump body, and the carbon dioxide input pipeline can transport carbon dioxide gas to the final-stage screw pump body and the vacuum pipeline to play a cooling and explosion-proof role; The air input pipeline is connected in series with a first flow meter, a first thermometer and a first pressure gauge, and the air input pipeline is also provided with a first switch valve for controlling on and off; A second flow meter, a second thermometer and a second pressure gauge are connected in series on the carbon dioxide input pipeline, and a second switch valve for controlling on and off is also provided on the carbon dioxide input pipeline; The final stage screw pump body is provided with a first inlet, a second inlet and a first outlet, the first inlet and the first outlet are connected in series to a vacuum pipeline, and the outlets of the air input pipeline and the carbon dioxide input pipeline can be connected to the second inlet; The vacuum pipeline is provided with a third flow meter, a third thermometer, a third pressure gauge and a third control valve at the first inlet, and the vacuum pipeline is provided with a fourth flow meter, a fourth thermometer, a fourth pressure gauge and a fourth control valve at the first outlet.

2. The final stage screw pump of the vacuum refining facility with cooling and explosion-proof structure as claimed in claim 1, characterized in that: The inlet of the air input pipeline is connected to the atmosphere.

3. The final stage screw pump of vacuum refining facility with cooling and explosion-proof structure as claimed in claim 1, characterized in that: The inlet of the carbon dioxide input pipeline is connected to the carbon dioxide storage tank.

4. The final screw pump of vacuum refining facility with cooling and explosion-proof structure as claimed in claim 1, characterized in that: The inlet of the carbon dioxide input pipeline is connected to the workshop pipeline network.

5. The final screw pump of vacuum refining facility with cooling and explosion-proof structure as claimed in claim 1, characterized in that: The inlet of the carbon dioxide input pipeline is connected to the carbon dioxide gas storage tank or the workshop pipeline network.

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