CN103611362B - A kind of filtration unit and petroleum hydrogenation system - Google Patents
A kind of filtration unit and petroleum hydrogenation system Download PDFInfo
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- CN103611362B CN103611362B CN201310680576.2A CN201310680576A CN103611362B CN 103611362 B CN103611362 B CN 103611362B CN 201310680576 A CN201310680576 A CN 201310680576A CN 103611362 B CN103611362 B CN 103611362B
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- 238000001914 filtration Methods 0.000 title claims abstract description 98
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 20
- 239000003208 petroleum Substances 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtration Of Liquid (AREA)
Abstract
The present invention discloses a kind of filtration unit, comprises the first strainer, tow filtrator and the 3rd strainer; The inlet end place of the first strainer is provided with and is with the first input tube of the first input valve, exit end place to be provided with the first output tube being with the first output valve; The inlet end place of tow filtrator is provided with and is with the 2nd input tube of the 2nd input valve, exit end place to be provided with the 2nd output tube being with the 2nd output valve; The inlet end of the 3rd strainer is provided with is with the 3rd input tube of the 3rd input valve, exit end to be provided with the 3rd output tube being with the 3rd output valve; First strainer and tow filtrator parallel connection form parallel filtering group; The free end of the 3rd input tube is connected with the output terminal of parallel filtering group, or the free end of the 3rd output tube is connected with the input terminus of parallel filtering group. This filtration group device can make two strainer series connection, good filtration effect. The present invention also provides a kind of petroleum hydrogenation system, and it applies above-mentioned filtration unit, it is possible to improve the purity of hydrogenating materials.
Description
Technical field
The present invention relates to filter plant technical field, more specifically, it relates to a kind of filtration unit, also relate to a kind of petroleum hydrogenation system.
Background technology
Along with the development of science and technology, filter plant is applied in industrial production more and more, as in refining of petroleum industry, the impurity such as sulphur and nitrogen that hydrogenation system is sloughed in oil need to be adopted, and hydrogenation system comprises the filtration unit for hydrogenating materials and hydrogenation unit, specifically introduce the structure of existing filtration unit below for the filtration unit of petroleum hydrogenation system.
The filtration unit of existing petroleum hydrogenation system comprises main strainer parallel with one another and reserve filter, main filter bits is in the first parallel branch, and the output tube that the input tube being connected with the inlet end of main strainer in the first parallel branch is provided with the first input valve, exit end with main strainer is connected is provided with the first output valve; Above-mentioned reserve filter is positioned in the 2nd parallel branch, and the input tube being connected with the inlet end of reserve filter in the 2nd parallel branch is provided with the 2nd input valve, the output tube that is connected with the inlet end of reserve filter is provided with the 2nd output valve; Above-mentioned first parallel branch all with for inputting total input tube of hydrogenating materials to be filtered is connected with the input tube in the 2nd parallel branch; Above-mentioned first parallel branch is all connected with total output tube of the hydrogenating materials filtered for exporting with the output tube of the 2nd parallel branch.
When applying above-mentioned filtration unit, the first input valve and the first output valve need to be opened, close the 2nd input valve and the 2nd output valve, so that main strainer comes into operation, reserve filter is for subsequent use; Through long-play, when the filter pressure of main strainer is higher, the first input valve and the first output valve need to be closed, input valve and the 2nd output valve of opening the 2nd, so that reserve filter comes into operation, main strainer is for subsequent use, accordingly, reserve filter needs after coming into operation to clean main strainer, so that it comes into operation again when the filter of reserve filter presses through high.
But, in existing filtration unit, main strainer and reserve filter all adopt the basket strainer of manual switchover, and the filtering accuracy of the basket strainer of manual switchover is poor, is unfavorable for that the raw material of hydrogenation unit obtains good filter effect.
In sum, how to provide the filtration unit of a kind of good filtration effect, and how a kind of petroleum hydrogenation system applying above-mentioned filtration unit is provided, be those skilled in the art's problem demanding prompt solutions.
Summary of the invention
In view of this, the present invention provides a kind of filtration unit, and its parallel filtering group being made up of the first strainer and tow filtrator is connected mutually with the 3rd strainer, is convenient to improve filter effect. The present invention also provides a kind of petroleum hydrogenation system, and it applies filtration unit provided by the invention, it is possible to improve the purity of hydrogenating materials.
For achieving the above object, the present invention provides following technical scheme:
A kind of filtration unit, comprises the first strainer, tow filtrator and the 3rd strainer, and wherein, the inlet end place of described first strainer is provided with the first input tube of band first input valve, and its exit end place is provided with the first output tube of band the first output valve; The inlet end place of described tow filtrator is provided with the 2nd input tube of band the 2nd input valve, and its exit end place is provided with the 2nd output tube of band the 2nd output valve; The inlet end of described 3rd strainer is provided with the 3rd input tube of band the 3rd input valve, and its exit end is provided with the 3rd output tube of band the 3rd output valve;
Described first strainer and the parallel connection of described tow filtrator form parallel filtering group;
The free end of described 3rd input tube is connected with the output terminal of described parallel filtering group, or the free end of described 3rd output tube is connected with the input terminus of described parallel filtering group.
Preferably, in above-mentioned filtration unit, the free end of described 3rd input tube is connected with the output terminal of described parallel filtering group.
Preferably, in above-mentioned filtration unit, also comprise two ends and it is respectively equipped with the first connecting leg and the conducting valve of the 2nd connecting leg; The free end of described first connecting leg is connected with described 3rd input tube, and on described 3rd input tube, the described 3rd inputs valve than described first connecting leg near described 3rd strainer; The free end of described 2nd connecting leg is connected with described 3rd output tube, and on described 3rd output tube, described 3rd delivery valve than described 2nd connecting leg closer to described 3rd strainer.
Preferably, in above-mentioned filtration unit, also comprise for making described first strainer and described tow filtrator the 3rd connecting leg along first party to series connection, the two ends of described 3rd connecting leg are connected with described 2nd input tube with described first output tube respectively, and on described first output tube, described 3rd connecting leg is than described first output valve near described first strainer, and on described 2nd input tube, described 3rd connecting leg inputs valve near described tow filtrator than the described 2nd; Described 3rd connecting leg is provided with valve; Described first party is to for by the direction of described first strainer to described tow filtrator.
Preferably, in above-mentioned filtration unit, also comprise the 4th connecting leg for making described first strainer and described tow filtrator connect along second direction, the two ends of described 4th connecting leg are connected with described first input tube with the 2nd output tube respectively, and on described 2nd output tube, described 4th connecting leg is than described 2nd output valve near described tow filtrator, and on described first input tube, described 4th connecting leg inputs valve near described first strainer than described first; Described second direction is by the direction of described tow filtrator to described first strainer.
A kind of petroleum hydrogenation system, comprises filtration unit, and described filtration unit is filtration unit described in any one in technique scheme.
The present invention provides a kind of filtration unit, it comprises the first strainer, tow filtrator and the 3rd strainer, wherein, the inlet end place of the first strainer is provided with the first input tube of band first input valve, and its exit end place is provided with the first output tube of band the first output valve; The inlet end place of tow filtrator is provided with the 2nd input tube of band the 2nd input valve, and its exit end place is provided with the 2nd output tube of band the 2nd output valve; The inlet end of the 3rd strainer is provided with the 3rd input tube of band the 3rd input valve, and its exit end is provided with the 3rd output tube of band the 3rd output valve; First strainer and tow filtrator parallel connection form parallel filtering group; The free end of the 3rd input tube is connected with the output terminal of parallel filtering group, or the free end of the 3rd output tube is connected with the input terminus of parallel filtering group.
When applying filtration unit provided by the invention, the first input valve, the first output valve, the 3rd input valve and the 3rd output valve can be first made to open, 2nd input valve and the 2nd output valve are closed, so that the first strainer and the 3rd strainer come into operation with the form connected simultaneously, make tow filtrator for subsequent use; After a certain time, the first input valve and the first output valve can be closed, input valve and the 3rd output valve of opening the 2nd, so that tow filtrator and the 3rd strainer come into operation with the form connected simultaneously, meanwhile, for subsequent use after making the first cleaning filter.
In filtration unit provided by the invention, the parallel filtering group being made up of the first strainer and tow filtrator is connected mutually with the 3rd strainer, it can make two strainers work with the state connected in working process simultaneously, compared to the filtration unit only being undertaken by a strainer in prior art filtering, it has the feature of good filtration effect.
The present invention also provides a kind of petroleum hydrogenation system, and it is specially filtration unit provided by the invention for clearing up the filtration unit of hydrogenating materials, it is possible to improve the purity of hydrogenating materials.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the filtration unit that Fig. 1 provides for the embodiment of the present invention;
Wherein, in upper Fig. 1:
Valve 10; First strainer 100; First input tube 101; First input valve 111; First output tube 102; First output valve 121; Tow filtrator 200; 2nd input tube 201; 2nd input valve 211; 2nd output tube 202; 2nd output valve 221; 3rd connecting leg 120; 4th connecting leg 210; 3rd strainer 300; 3rd input tube 301; 3rd input valve 311; 3rd output tube 302; 3rd output valve 321; First connecting leg 31; Conducting valve 30; 2nd connecting leg 32.
Embodiment
The embodiment of the invention discloses a kind of filtration unit, its parallel filtering group being made up of the first strainer and tow filtrator 200 is connected mutually with the 3rd strainer, is convenient to improve filter effect. The invention also discloses a kind of petroleum hydrogenation system, it applies filtration unit provided by the invention, it is possible to improve the purity of hydrogenating materials.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, the filtration unit that the embodiment of the present invention provides comprises the first strainer 100, tow filtrator 200 and the 3rd strainer 300; The inlet end place of the first strainer 100 is provided with the first input tube 101 of band first input valve 111, and its exit end place is provided with the first output tube 102 of band the first output valve 121; The inlet end place of tow filtrator 200 is provided with the 2nd input tube 201 of band the 2nd input valve 211, and its exit end place is provided with the 2nd output tube 202 of band the 2nd output valve 221; The inlet end of the 3rd strainer 300 is provided with the 3rd input tube 301 of band the 3rd input valve 311, and its exit end is provided with the 3rd output tube 302 of band the 3rd output valve 321; First strainer 100 and tow filtrator 200 parallel connection form parallel filtering group, wherein, first input tube 101, first strainer 100 and the first output tube 102 form the first parallel branch, and the first input valve 111 and the first output valve 121 are all positioned in the first parallel branch; 2nd input tube 201, tow filtrator 200 and the 2nd output tube 202 form the 2nd parallel branch, and the 2nd input valve 211 and the 2nd output valve 221 be all positioned in the 2nd parallel branch; The free end of the 3rd input tube 301 is connected with the output terminal of parallel filtering group, or the free end of the 3rd output tube 302 is connected with the input terminus of parallel filtering group.
During the filtration unit that the application embodiment of the present invention provides, the first input valve 111, first output valve 121, the 3rd input valve 311 and the 3rd output valve 321 can be first made to open, 2nd input valve 211 and the 2nd output valve 221 are closed, so that the first strainer 100 and the 3rd strainer 300 come into operation with the form connected simultaneously, make tow filtrator 200 for subsequent use; After a certain time, the first input valve 111 and the first output valve 121 can be closed, input valve 211 and the 3rd output valve 321 of opening the 2nd, so that tow filtrator 200 and the 3rd strainer 300 come into operation with the form connected simultaneously, meanwhile, the first strainer 100 is made to clean rear for subsequent use.
In the filtration unit that the embodiment of the present invention provides, the parallel filtering group being made up of the first strainer 100 and tow filtrator 200 is connected mutually with the 3rd strainer 300, it can make two strainers work with the state connected in working process simultaneously, compared to the filtration unit only being undertaken by a strainer in prior art filtering, it has the feature of good filtration effect.
Due to the 3rd strainer 300 need to the first strainer 100 or tow filtrator 200 tandem working, therefore in order to alleviate the workload of the 3rd strainer 300, its rear strainer being set in two strainers mutually connected, therefore in the filtration unit of above-described embodiment offer, the free end of the 3rd input tube 301 is connected with the output terminal of parallel filtering group.
Owing to the 3rd strainer 300 is in running order all the time, strainer is caused to work in order to avoid filtration unit maybe to need cleaning because the 3rd strainer 300 damages, in the filtration unit that above-described embodiment provides, also comprise two ends and it is respectively equipped with the first connecting leg 31 and the conducting valve 30 of the 2nd connecting leg 32;The free end of above-mentioned first connecting leg 31 is connected with the 3rd input tube 301, and on the 3rd input tube 301, the 3rd input valve 311 to the first connecting leg 31 is closer to the 3rd strainer 300; The free end of above-mentioned 2nd connecting leg 32 is connected with the 3rd output tube 302, and on the 3rd output tube 302, the 3rd output valve 321 to the two connecting leg 32 is closer to the 3rd strainer 300. In the filtration unit that the present embodiment provides, 3rd strainer 300 filters conducting and joint group with conducting valve 30 formation parallel with one another, this filtration conducting joint group are connected mutually with above-mentioned parallel filtering group, and this filtration conducting and joint group comprises the 3rd parallel branch and the 4th parallel branch; 3rd parallel branch comprises the 3rd strainer 300, the 3rd input valve 311 and the 3rd output valve 321; 4th parallel branch comprises conducting valve 30, first connecting leg 31 and the 2nd connecting leg 32. During the filtration unit that application the present embodiment provides, if the 3rd strainer 300 needs to clean, repair or change, then open conducting valve 30, and close the 3rd input valve 311 and the 3rd output valve 321 can carry out cleaning, repair or more changing jobs, when carrying out above-mentioned cleaning, repairing or change the work of the 3rd strainer 300, first strainer 100 or tow filtrator 200 carry out the independent filtration of of short duration time, and the work of above-mentioned cleaning, repairing or replacing the 3rd strainer 300 needs to make the 3rd strainer 300 come into operation at once after completing.
In the filtration unit that above-described embodiment provides, if the 3rd strainer 300 cannot work, the first strainer 100 or tow filtrator 200 can be caused to come into operation separately, cannot ensure that working process has two strainer work all the time, cannot guarantee that the whole filtration unit moment possesses good filter effect, therefore in order to avoid the problems referred to above, in the filtration unit that the present embodiment provides, also comprise for making the first strainer and tow filtrator 200 the 3rd connecting leg 120 along first party to series connection, the two ends of the 3rd connecting leg 120 are connected with the 2nd input tube 201 with the first output tube 102 respectively, and on the first output tube 102, 3rd connecting leg 120 to the first output valve 121 is closer to the first strainer 100, on the 2nd input tube 201, 3rd connecting leg 120 to the two inputs valve 211 near tow filtrator 200, 3rd connecting leg 120 is provided with valve 10, first party is to for by the direction of the first strainer 100 to tow filtrator 200.
When applying above-mentioned filtration unit, the 3rd input valve 311, the 3rd output valve 321, first output valve 121, the 2nd input valve 211 can be closed, open the valve 10, first on the 3rd connecting leg 120 and input valve 111, the 2nd output valve 221 and conducting valve 30, then in whole filtration unit, first strainer 100 and tow filtrator 200 come into operation with the form connected, and the circulating direction of raw material to be filtered is by the first strainer 100 to tow filtrator 200 in series via, above-mentioned 3rd strainer 300 is state for subsequent use. Accordingly, make the first strainer 100 connect with the 3rd strainer 300 to come into operation, when making tow filtrator 200 for subsequent use, or tow filtrator 200 is connected with the 3rd strainer 300 come into operation, when making the first strainer 100 for subsequent use, all need to make conducting valve 30 to close. In the filtration unit that the present embodiment provides, respectively any one strainer in the first strainer 100, tow filtrator 200 and the 3rd strainer 300 can be switched to state for subsequent use, can guarantee working process has all the time two strainers be in tandem working state, and then guarantee the stability of the filter effect of whole filtration unit.
Further, in the filtration unit that above-described embodiment provides, also comprise the 4th connecting leg 210 for making the first strainer 100 and tow filtrator 200 connect along second direction, the two ends of the 4th connecting leg 210 are connected with the first input tube 101 with the 2nd output tube 202 respectively, and on the 2nd output tube 202,4th connecting leg 210 to the two output valve 221 is closer to tow filtrator 200, and on the first input tube 101, the 4th connecting leg 210 to the first inputs valve 111 closer to the first strainer 100, second direction is by the direction of tow filtrator 200 to the first strainer 100. the present embodiment provides in strainer, the direction of the series via that the first strainer 100 and tow filtrator 200 are formed also can along tow filtrator 200 to the first strainer 100, during application, the 3rd input valve 311 can be closed, 3rd output valve 321, first input valve 111, 2nd output valve 221, valve 10 on 3rd connecting leg 120, open the valve 10 on the 4th connecting leg 210, 2nd input valve 211, first output valve 121 and conducting valve 30, then in whole filtration unit, tow filtrator 200 and the first strainer 100 are connected successively and are come into operation, 3rd strainer 300 is for subsequent use. application the present embodiment provide filtration unit time, if make the first strainer 100 and tow filtrator 200 connect successively come into operation, the 3rd strainer 300 for subsequent use, the valve 10 of the 4th connecting leg 210 need to be made to close, if making, the first strainer 100 and the series connection of the 3rd strainer 300 come into operation, tow filtrator 200 is for subsequent use, and the valve 10 of the 4th connecting leg 210 and the valve 10 of the 3rd connecting leg 120 need to be made to close respectively, if making, tow filtrator 200 and the series connection of the 3rd strainer 300 come into operation, the first strainer 100 is for subsequent use, and the valve 10 of the 4th connecting leg 210 and the valve 10 of the 3rd connecting leg 120 need to be made to close respectively.
Concrete, in the filtration unit that above-described embodiment provides, first strainer 100, tow filtrator 200 and the 3rd strainer 300 are respectively the basket strainer of manual switchover, the basket strainer of this manual switchover comprises cylinder, copper filter core, drainage and nitrogen vapor purging system, during cleaning, above-mentioned copper filter core need to be cleaned.
Preferably, in the filtration unit that above-described embodiment provides, the filter pressure of the strainer being in the state of coming into operation should be not more than preset value, this strainer need to be switched to state for subsequent use if exceeding preset value and cleans. Above-mentioned preset value can be set to 0.1MPa, but in order to better protect the filter core of strainer, it is preferably set to 0.1MPa. Certainly, above-mentioned preset value also can specifically be set to other value according to the kind of strainer.
The embodiment of the present invention also provides a kind of petroleum hydrogenation system, and it comprises hydrogenation unit and the filtration unit for the raw material of clearing up hydrogenation unit, wherein, and the filtration unit that filtration unit provides for above-described embodiment. The hydrogenation system that the present embodiment provides applies the filtration unit that above-described embodiment provides, it may be possible to provide the purity of hydrogenating materials.
In this specification sheets, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment emphasis illustrated is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are enable to realize or use the present invention. To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a filtration unit, it is characterized in that, comprise the first strainer, tow filtrator and the 3rd strainer, wherein, the inlet end place of described first strainer is provided with the first input tube of band first input valve, and its exit end place is provided with the first output tube of band the first output valve;The inlet end place of described tow filtrator is provided with the 2nd input tube of band the 2nd input valve, and its exit end place is provided with the 2nd output tube of band the 2nd output valve; The inlet end of described 3rd strainer is provided with the 3rd input tube of band the 3rd input valve, and its exit end is provided with the 3rd output tube of band the 3rd output valve;
Described first strainer and the parallel connection of described tow filtrator form parallel filtering group;
The free end of described 3rd input tube is connected with the output terminal of described parallel filtering group, or the free end of described 3rd output tube is connected with the input terminus of described parallel filtering group;
Also comprise for making described first strainer and described tow filtrator the 3rd connecting leg along first party to series connection, the two ends of described 3rd connecting leg are connected with described 2nd input tube with described first output tube respectively, and on described first output tube, described 3rd connecting leg than described first output valve near described first strainer, on described 2nd input tube, described 3rd connecting leg inputs valve near described tow filtrator than the described 2nd; Described 3rd connecting leg is provided with valve; Described first party is to for by the direction of described first strainer to described tow filtrator.
2. filtration unit according to claim 1, it is characterised in that, the free end of described 3rd input tube is connected with the output terminal of described parallel filtering group.
3. filtration unit according to claim 2, it is characterised in that, also comprise two ends and it is respectively equipped with the first connecting leg and the conducting valve of the 2nd connecting leg; The free end of described first connecting leg is connected with described 3rd input tube, and on described 3rd input tube, the described 3rd inputs valve than described first connecting leg near described 3rd strainer; The free end of described 2nd connecting leg is connected with described 3rd output tube, and on described 3rd output tube, described 3rd delivery valve than described 2nd connecting leg closer to described 3rd strainer.
4. filtration unit according to claim 1, it is characterized in that, also comprise the 4th connecting leg for making described first strainer and described tow filtrator connect along second direction, the two ends of described 4th connecting leg are connected with described first input tube with the 2nd output tube respectively, and on described 2nd output tube, described 4th connecting leg than described 2nd output valve near described tow filtrator, on described first input tube, described 4th connecting leg inputs valve near described first strainer than described first; Described second direction is by the direction of described tow filtrator to described first strainer.
5. a petroleum hydrogenation system, comprises filtration unit, it is characterised in that, described filtration unit is the filtration unit described in claim 1-4 any one.
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| CN201310680576.2A CN103611362B (en) | 2013-12-13 | 2013-12-13 | A kind of filtration unit and petroleum hydrogenation system |
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| CN201310680576.2A CN103611362B (en) | 2013-12-13 | 2013-12-13 | A kind of filtration unit and petroleum hydrogenation system |
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| CN103611362B true CN103611362B (en) | 2016-06-08 |
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| CN107321048A (en) * | 2017-07-27 | 2017-11-07 | 中国石油化工股份有限公司 | For improving the device of refinery's purification reusing rate and the application method of the device |
| CN111001217A (en) * | 2019-12-20 | 2020-04-14 | 紫荆三益过滤技术有限责任公司 | Dirty oil filtering and purifying device polluted by high-concentration ultrafine particle pollutants |
| CN113730992B (en) * | 2021-09-26 | 2022-04-15 | 中国农业科学院农业环境与可持续发展研究所 | Automatic washing device for net filter of biogas slurry drip irrigation system and application of automatic washing device |
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| CN103611362A (en) | 2014-03-05 |
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