CN212864834U - RH vacuum refining system - Google Patents
RH vacuum refining system Download PDFInfo
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- CN212864834U CN212864834U CN202020378019.0U CN202020378019U CN212864834U CN 212864834 U CN212864834 U CN 212864834U CN 202020378019 U CN202020378019 U CN 202020378019U CN 212864834 U CN212864834 U CN 212864834U
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Abstract
The utility model relates to a RH vacuum refining system, its mechanical vacuum pump unit arrange including the series connection in the tertiary lobe pump unit and the water ring vacuum pump unit of being responsible for of bleeding, first order lobe pump unit is connected with the real empty room of RH and is equipped with the vacuum main valve on the person in charge of bleeding between the two, and preceding tertiary lobe pump unit all includes at least one lobe pump, and water ring vacuum pump unit includes at least one water ring vacuum pump. The utility model discloses a water ring vacuum pump replaces traditional screw pump, because water ring vacuum pump can the atmosphere in line and have very big air exhaust ability, starts third level roots pump after the vacuum chamber pressure drops the setting value again, can effectively reduce roots pump's air inlet and gas outlet pressure differential, effectively solves roots pump and generates heat the problem that the card hinders. In addition, the water ring vacuum pump is adopted to replace a screw pump, and the first three-stage roots pump can be a domestic pump, so that the investment cost and the maintenance cost can be obviously reduced.
Description
Technical Field
The utility model belongs to the technical field of the steelmaking production, concretely relates to RH vacuum refining system.
Background
RH (Rheinstahl Hutlenwerke) refining technology was developed successfully in 1959 by the company Rheinstahl and Hutlenwerke in Germany, RH combines vacuum refining with molten steel circulating flow, has the advantages of short treatment period, large production capacity, good refining effect and the like, and is suitable for converter steel plants with short smelting period and large production capacity. Because the gas generation amount is great in the molten steel vacuum refining process, the vacuum pump systems are mainly two types at present, namely a steam jet pump and a dry mechanical vacuum pump, wherein the dry mechanical vacuum pump mainly has two types, namely a modular type and a non-modular type. The dry mechanical vacuum pump system mainly has high investment cost and high production failure rate at present, and the reasons are as follows:
(1) the final stage pump of the existing dry type mechanical vacuum pump adopts a screw pump, and due to the working condition of the pumped fluid, when the roots pump uses a domestic pump, the screw pump needs to adopt an import pump, so that the investment cost is higher;
(2) the main reason that the production failure rate of the existing dry type mechanical vacuum pump is high is that the production process mode of the vacuum pump system is limited by the air pumping capacity of a final-stage screw pump: in the molten steel vacuum refining process, the pressure in a vacuum chamber needs to be quickly reduced to about 67Pa from the standard atmospheric pressure (101325Pa) within 4 minutes, the vacuum refining process is limited by the pumping capacity of a last-stage screw pump, only the atmosphere is directly discharged through a third-stage air-cooled roots pump, and when the pressure in the vacuum chamber reaches a set value, the last-stage screw pump is connected into the system in series. Although the heating blockage of the roots pump is relieved through the mode of returning air for cooling in the air-cooled roots pump direct discharging atmosphere process, the heating blockage problem of the roots pump is not completely solved, and even the situation that the pumping efficiency of the roots pump is reduced is caused to appear due to the overlarge returning air amount.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a RH vacuum refining system, which can at least solve part of the defects of the prior art.
The utility model relates to a RH vacuum refining system, including the real empty room of RH and with the mechanical vacuum pump unit that the real empty room of RH is connected, the mechanical vacuum pump unit is responsible for and the series arrangement is in this first order lobe pump unit, second grade lobe pump unit, third level lobe pump unit and water ring vacuum pump unit on being responsible for of bleeding including bleeding, first order lobe pump unit with the real empty room of RH is connected and is equipped with the vacuum main valve on the person in charge of bleeding between the two, and preceding third level lobe pump unit all includes a lobe pump or a plurality of lobe pumps of parallel arrangement, water ring vacuum pump unit includes a water ring vacuum pump or a plurality of water ring vacuum pumps of parallel arrangement.
In one embodiment, each roots pump of the third-stage roots pump unit is an air-cooled roots pump.
In one embodiment, each roots pump of the first-stage roots pump unit is a first roots pump, and each roots pump of the second-stage roots pump unit is a second roots pump;
the pump set comprises a first-stage roots pump unit and a second-stage roots pump unit, wherein the first-stage roots pump unit and the second-stage roots pump unit are combined and arranged to form a pump set module or a plurality of pump set modules arranged in parallel, each pump set module comprises a pumping branch and a backing pump set and a back pump set which are arranged on the pumping branch in series, the backing pump set comprises a first roots pump or a plurality of first roots pumps arranged in parallel, and the back pump set comprises a second roots pump or a plurality of second roots pumps arranged in parallel.
In one embodiment, the inlet side and the outlet side of the suction branch are provided with a shut-off valve.
In one embodiment, the mechanical vacuum pump unit further includes a first bypass pipe, and the first bypass pipe is provided with a shut-off valve, an inlet end of the first bypass pipe is connected to the inlet-side main exhaust pipe of the first-stage roots pump unit, and an outlet end of the first bypass pipe is connected to the outlet-side main exhaust pipe of the second-stage roots pump unit.
In one embodiment, the mechanical vacuum pump unit further includes a second bypass line and a shut-off valve is disposed on the second bypass line, an inlet end of the second bypass line is connected to the inlet-side main exhaust pipe of the third-stage roots pump unit, and an outlet end of the second bypass line is connected to the outlet-side main exhaust pipe of the third-stage roots pump unit.
In one embodiment, the mechanical vacuum pump unit further comprises a dust removal unit, the dust removal unit is arranged between the vacuum main valve and the first-stage roots pump unit, and the dust removal unit comprises a group of dust removers or a plurality of groups of dust removers arranged in parallel.
As an embodiment, the dust remover is a bag dust remover.
The utility model discloses following beneficial effect has at least:
the utility model discloses a water ring vacuum pump replaces traditional screw pump and constitutes mechanical vacuum pump unit, because the working characteristic of water ring vacuum pump, but water ring vacuum pump straight vent atmosphere and have very big air exhaust ability, starts third level roots pump again after vacuum chamber pressure drops the setting value, can effectively reduce roots pump's air inlet and gas outlet pressure differential, effectively solves roots pump and generates heat the problem that the card hinders. In addition, the water ring vacuum pump is adopted to replace a screw pump, and the first three-stage roots pump can be a domestic pump, so that the investment cost and the maintenance cost can be obviously reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an RH vacuum refining system provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the utility model provides a RH vacuum refining system, including the real empty room 1 of RH and with the mechanical vacuum pump unit that the real empty room 1 of RH is connected, the mechanical vacuum pump unit is responsible for and the series arrangement is responsible for first order roots pump unit, second level roots pump unit, third level roots pump unit and water ring vacuum pump unit in this bleeding including bleeding, first order roots pump unit with real empty room 1 of RH is connected and is responsible for and be equipped with vacuum main valve 10 in bleeding between the two, and preceding third level roots pump unit all includes a roots pump or a plurality of roots pumps of parallel arrangement, water ring vacuum pump unit includes a water ring vacuum pump 5 or a plurality of water ring vacuum pumps 5 of parallel arrangement.
The RH vacuum chamber 1 is a container for molten steel circulation reaction, and is a conventional apparatus in the field, and is not described herein again.
The above-mentioned vacuum main valve 10 is used for controlling communication or interruption between the RH vacuum chamber 1 and the mechanical vacuum pump unit, and preferably employs an automatic valve suitable for remote control, such as a pneumatic valve.
The first-stage roots pump unit preferably comprises a plurality of roots pumps, and in the present embodiment, the roots pumps are all the first roots pumps 2, as described above, the first roots pumps 2 of the first-stage roots pump unit are arranged in parallel, and one or more of the first roots pumps 2 can be selected to be used for pumping according to needs.
The second-stage roots pump unit preferably includes a plurality of roots pumps, and in this embodiment, the roots pumps are all the second roots pumps 3, and as described above, the second roots pumps 3 of the second-stage roots pump unit are arranged in parallel, and one or more of the second roots pumps 3 can be selected to be used for pumping as required.
The third-stage roots pump unit preferably includes a plurality of roots pumps, and in this embodiment, the roots pumps of the third-stage roots pump unit are all defined as the third roots pumps 4, as described above, the third roots pumps 4 of the third-stage roots pump unit are arranged in parallel, and one or more third roots pumps 4 can be selected to be used for pumping operation as required. Preferably, each third roots pump 4 is the air-cooled roots pump, and the problem of roots pump heating card resistance is alleviated to the refrigerated mode of accessible returning gas in-process of directly discharging to the atmosphere, improves the operational reliability of this third level roots pump unit and each third roots pump 4's life.
The water ring vacuum pump unit preferably includes a plurality of water ring vacuum pumps 5, and as described above, the water ring vacuum pumps 5 of the water ring vacuum pump unit are arranged in parallel, and one or more of the water ring vacuum pumps 5 may be selected to perform pumping operation as needed.
In one embodiment, the mechanical vacuum pump assembly is in a non-modular form, and specifically, the air exhaust branch of each first roots pump 2 is provided with a stop valve, and preferably, the stop valves are respectively arranged on the inlet side and the outlet side of the first roots pump 2. Similarly, the air suction branch of each second roots pump 3 is provided with a cut-off valve, preferably, the cut-off valves are respectively arranged at the inlet side and the outlet side of the second roots pump 3; the air exhaust branch of each third roots pump 4 is provided with a stop valve, preferably the inlet side and the outlet side of the third roots pump 4 are respectively provided with a stop valve; the air exhaust branch of each water ring vacuum pump 5 is provided with a shut-off valve, and preferably, the shut-off valves are respectively provided on the inlet side and the outlet side of the water ring vacuum pump 5.
In other embodiments, the mechanical vacuum pump assembly is in a modular form, for example, one or more first roots pumps 2, one or more second roots pumps 3, a third roots pump 4 and a water ring vacuum pump 5 are combined into a module, and the specific arrangement thereof will not be described in detail herein.
In the present embodiment, a partially modular structure is adopted, specifically, as shown in fig. 1, a first-stage roots pump unit and a second-stage roots pump unit are combined and arranged to form a pump unit module 7 or a plurality of pump unit modules 7 arranged in parallel, each pump unit module 7 comprises a pump unit branch and a front-stage pump unit and a rear-stage pump unit which are arranged in series on the pump unit branch, the front-stage pump unit comprises a first roots pump 2 or a plurality of first roots pumps 2 arranged in parallel, and the rear-stage pump unit comprises a second roots pump 3 or a plurality of second roots pumps 3 arranged in parallel; in the structure shown in fig. 1, there is a manner in which 4 first roots pumps 2 and 1 second roots pump 3 are combined into one pump group module 7, and there are a plurality of pump group modules 7, although not limited to such a combination; in above-mentioned pump package module 7, not only each first lobe pump 2 and the 3 aggregate erection of second lobe pump correspondingly can practice thrift installation space, improves the installation effectiveness, and each lobe pump in every pump package module 7 is worked in step moreover, can adopt fixed procedure to open and stop, can reduce the opening of mechanical vacuum pump unit effectively and open and stop the control degree of difficulty. Meanwhile, each third roots pump 4 and each water ring vacuum pump 5 are independently controlled respectively, so that the working stability and reliability of the mechanical vacuum pump unit can be ensured.
In the above-described partially modular construction, as shown in fig. 1, a first shut-off valve 91 is provided in the pump stack branch in which each pump stack module 7 is located, and preferably also in the inlet side and in the outlet side of the pump stack branch, respectively. A second cut-off valve 92 is arranged on the air exhaust branch of each third roots pump 4, preferably, the second cut-off valves 92 are respectively arranged on the inlet side and the outlet side of the third roots pump 4; the air exhaust branch of each water ring vacuum pump 5 is provided with a third shut-off valve 93, and preferably, the inlet side and the outlet side of the water ring vacuum pump 5 are provided with the third shut-off valves 93.
Further optimizing the structure of the above-mentioned mechanical vacuum pump unit, as shown in fig. 1, the mechanical vacuum pump unit further includes a first bypass pipeline 11, and a fourth cut-off valve 94 is disposed on the first bypass pipeline 11, an inlet end of the first bypass pipeline 11 is connected to the inlet side main exhaust pipe of the first-stage roots pump unit, and an outlet end of the first bypass pipeline 11 is connected to the outlet side main exhaust pipe of the second-stage roots pump unit. Through this first bypass pipeline 11, whether can select first order roots pump unit and second level roots pump unit to put into operation, when first order roots pump unit and second level roots pump unit do not put into operation, can realize the intercommunication of RH vacuum chamber 1 and subsequent third level roots pump unit and water ring vacuum pump unit via this first bypass pipeline 11.
Further optimizing the structure of the above-mentioned mechanical vacuum pump unit, as shown in fig. 1, the mechanical vacuum pump unit further includes a second bypass pipe 12, and a fifth cut-off valve 95 is disposed on the second bypass pipe 12, an inlet end of the second bypass pipe 12 is connected to the inlet-side main exhaust pipe of the third-stage roots pump unit, and an outlet end of the second bypass pipe 12 is connected to the outlet-side main exhaust pipe of the third-stage roots pump unit. Through this second bypass pipeline 12, can select whether third level roots pump unit puts into operation, when this third level roots pump unit does not put into operation, can realize the intercommunication of RH vacuum chamber 1 and subsequent water ring vacuum pump unit via this second bypass pipeline 12.
Further optimizing the structure of the mechanical vacuum pump unit, as shown in fig. 1, the mechanical vacuum pump unit further includes a dust removal unit, the dust removal unit is disposed between the vacuum main valve 10 and the first-stage roots pump unit, and the dust removal unit includes a group of dust removers 6 or a plurality of groups of dust removers 6 disposed in parallel. The dust collector 6 is preferably a dry dust collector 6, for example, a bag dust collector 6; the suction branch of the dust separator 6 is provided with a control valve 96, and preferably, the inlet side and the outlet side of the dust separator 6 are respectively provided with the control valves 96, for example, electromagnetic valves.
Further detailing the above structure, as shown in fig. 1, the main exhaust duct includes a first main duct 81, a second main duct 82, a third main duct 83, a fourth main duct 84, and a fifth main duct 85, wherein:
one end of the first main pipe 81 is connected with the RH vacuum chamber 1 and the other end is sealed, the inlet end of the dust removal unit is connected to the first main pipe 81, and the outlet end of the dust removal unit is connected to the second main pipe 82 (both ends are sealed); the inlet end of each pump unit module 7 is connected to the second main pipe 82, and the outlet end of each pump unit module 7 is connected to the third main pipe 83 (both ends are sealed); the inlet end of the third-stage roots pump unit is connected to the third main pipe 83, and the outlet end of the third-stage roots pump unit is connected to the fourth main pipe 84 (both ends are sealed); the inlet end of the water ring vacuum pump unit is connected to the fourth main pipe 84 and the outlet end of the water ring vacuum pump unit is connected to the fifth main pipe 85, the fifth main pipe 85 being optionally sealed at one end and vented to the atmosphere at the other end.
Based on above-mentioned RH vacuum refining system's structure, the embodiment of the utility model also relates to the application method of above-mentioned RH vacuum refining system, include:
according to the received working instruction, the RH vacuum refining system is pumped in different working modes by controlling the working state of each pump, wherein:
(1) when the system operates in a pre-pumping working mode, the vacuum main valve 10 is closed, the water ring vacuum pump unit is put into operation, all the lobe pumps of the first three-stage lobe pump unit are stopped, and bypass pipelines are correspondingly built to pre-pump the main pumping pipe behind the vacuum main valve 10.
More specifically, the bypass pipes built up accordingly, i.e. the first bypass pipe 11 and the second bypass pipe 12, are built up; the vacuum main valve 10 is closed, the first cut-off valve 91 on the inlet and outlet sides of each pump set module 7 is closed, the second cut-off valve 92 on the inlet and outlet sides of each third roots pump 4 is closed, and each first roots pump 2, each second roots pump 3 and each third roots pump 4 are in a pump stop state;
the control valve 96 on the inlet and outlet side of each dust collector 6 is opened, the fourth shut-off valve 94 on the first bypass pipe 11 is opened, the fifth shut-off valve 95 on the second bypass pipe 12 is opened, the third shut-off valve 93 on the inlet and outlet side of each water ring vacuum pump 5 is opened, and each water ring vacuum pump 5 is in an opened state.
In one embodiment, the pressure in the pipe after the vacuum main valve 10 can be rapidly reduced to 25000Pa by the pre-pumping process.
(2) When the system operates in a light treatment working mode or a forced oxygen blowing and decarburization working mode, the vacuum main valve 10 is opened, the third-stage roots pump unit and the water ring vacuum pump unit are both put into operation, and the roots pumps of the first-stage roots pump unit and the second-stage roots pump unit are all stopped and bypass pipelines are correspondingly built, so that the pressure in the RH vacuum chamber 1 is reduced and maintained at a preset pressure.
More specifically, the above-mentioned bypass pipeline, which is built up accordingly, comprises building up the above-mentioned first bypass pipeline 11;
the first cut-off valve 91 on the inlet and outlet sides of each pump unit module 7 is closed, and each first roots pump 2 and each second roots pump 3 are in a pump stop state (when the second bypass pipeline 12 is available, the fifth cut-off valve 95 on the second bypass pipeline 12 is closed);
the vacuum main valve 10 is opened, the control valve 96 on the inlet and outlet sides of each dust collector 6 is opened, the fourth shut-off valve 94 on the first bypass line 11 is opened, the second shut-off valve 92 on the inlet and outlet sides of each third roots pump 4 is opened, the third shut-off valve 93 on the inlet and outlet sides of each water ring vacuum pump 5 is opened, and each third roots pump 4 and each water ring vacuum pump 5 are in an opened state.
In one embodiment, the pressure in the RH vacuum chamber 1 can be rapidly reduced and maintained at about 6000Pa, such as 5500-6200 Pa, in the light treatment mode or the forced oxygen decarburization mode.
(3) When the system operates in the processing working mode, the vacuum main valve 10 is opened, and the first three-stage roots pump unit and the water ring vacuum pump unit are all put into operation, so that the pressure in the RH vacuum chamber 1 is reduced and maintained at the preset pressure.
More specifically, the vacuum main valve 10 is opened, the control valve 96 on the inlet and outlet sides of each dust collector 6 is opened, the first cut-off valve 91 on the inlet and outlet sides of each pump unit module 7 is opened, the second cut-off valve 92 on the inlet and outlet sides of each third roots pump 4 is opened, the third cut-off valve 93 on the inlet and outlet side of each water ring vacuum pump 5 is opened, and each first roots pump 2, each second roots pump 3, each third roots pump 4, and each water ring vacuum pump 5 are all in an opened state;
when the first bypass pipeline 11 and the second bypass pipeline 12 exist, the fourth stop valve 94 on the first bypass pipeline 11 is closed, and the fifth stop valve 95 on the second bypass pipeline 12 is closed;
in one embodiment, in the present processing mode, the pressure in the RH vacuum chamber 1 can be rapidly reduced and maintained at about 67Pa, for example, 60 to 70Pa, by the above operation.
It can be understood that the above three operation modes can be operated step by step in a processing cycle, for example, before the light processing operation mode or the forced oxygen blowing decarburization operation mode, the above pre-pumping operation mode is performed, after the pre-pumping operation is completed, the vacuum main valve is opened, the pressure in the pipeline is increased due to the pressure equalizing effect, the pumping operation is continued through the water ring vacuum pump, and the third-stage roots pump is started until the pressure in the RH vacuum chamber is reduced to about 25000 Pa.
The RH vacuum refining system and the use method thereof provided by the embodiment adopt the water ring vacuum pump 5 to replace the traditional screw pump to form a mechanical vacuum pump unit, and due to the working characteristics of the water ring vacuum pump 5, the water ring vacuum pump 5 can be directly discharged into the atmosphere and has great air pumping capacity, and when the pressure of a vacuum chamber is reduced to a set value, the third-stage roots pump is started, so that the pressure difference between the air inlet and the air outlet of the roots pump can be effectively reduced, and the problem of heating and blocking of the roots pump is effectively solved. In addition, the water ring vacuum pump 5 is adopted to replace a screw pump, and the first three-stage roots pump can be a domestic pump, so that the investment cost and the maintenance cost can be obviously reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An RH vacuum refining system, includes RH vacuum chamber and with the mechanical vacuum pump unit that the RH vacuum chamber is connected, its characterized in that: the mechanical vacuum pump unit comprises a main pumping pipe, a first-stage roots pump unit, a second-stage roots pump unit, a third-stage roots pump unit and a water ring vacuum pump unit, wherein the first-stage roots pump unit, the second-stage roots pump unit, the third-stage roots pump unit and the water ring vacuum pump unit are arranged on the main pumping pipe in series, the first-stage roots pump unit is connected with the RH vacuum chamber, the main pumping pipe between the first-stage roots pump unit and the RH vacuum chamber is provided with a vacuum main valve, the first-stage roots pump unit comprises one roots pump or a plurality of roots pumps arranged in parallel, and the water ring vacuum.
2. The RH vacuum refining system of claim 1, wherein: and each roots pump of the third-stage roots pump unit is an air-cooled roots pump.
3. The RH vacuum refining system of claim 1, wherein: each roots pump of the first-stage roots pump unit is a first roots pump, and each roots pump of the second-stage roots pump unit is a second roots pump;
the pump set comprises a first-stage roots pump unit and a second-stage roots pump unit, wherein the first-stage roots pump unit and the second-stage roots pump unit are combined and arranged to form a pump set module or a plurality of pump set modules arranged in parallel, each pump set module comprises a pumping branch and a backing pump set and a back pump set which are arranged on the pumping branch in series, the backing pump set comprises a first roots pump or a plurality of first roots pumps arranged in parallel, and the back pump set comprises a second roots pump or a plurality of second roots pumps arranged in parallel.
4. An RH vacuum refining system according to claim 3, wherein: the inlet side and the outlet side of the air exhaust branch are both provided with a stop valve.
5. An RH vacuum refining system according to claim 3, wherein: the mechanical vacuum pump unit further comprises a first bypass pipeline, a stop valve is arranged on the first bypass pipeline, the inlet end of the first bypass pipeline is connected to the inlet side air exhaust main pipe of the first-stage roots pump unit in a bypassing mode, and the outlet end of the first bypass pipeline is connected to the outlet side air exhaust main pipe of the second-stage roots pump unit in a bypassing mode.
6. An RH vacuum refining system as claimed in claim 1 or 5, wherein: the mechanical vacuum pump unit further comprises a second bypass pipeline, a stop valve is arranged on the second bypass pipeline, the inlet end of the second bypass pipeline is connected to the inlet side exhaust main pipe of the third-stage roots pump unit in a bypassing mode, and the outlet end of the second bypass pipeline is connected to the outlet side exhaust main pipe of the third-stage roots pump unit in a bypassing mode.
7. The RH vacuum refining system of claim 1, wherein: the mechanical vacuum pump unit further comprises a dust removal unit, the dust removal unit is arranged between the vacuum main valve and the first-stage roots pump unit, and the dust removal unit comprises a group of dust removers or a plurality of groups of dust removers which are arranged in parallel.
8. The RH vacuum refining system of claim 7, wherein: the dust remover is a bag-type dust remover.
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| CN202020378019.0U CN212864834U (en) | 2020-03-23 | 2020-03-23 | RH vacuum refining system |
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| CN202020378019.0U CN212864834U (en) | 2020-03-23 | 2020-03-23 | RH vacuum refining system |
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| CN212864834U true CN212864834U (en) | 2021-04-02 |
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