CN115815246A - Reverse purging method and device for blocking of negative pressure vacuum pipeline - Google Patents
Reverse purging method and device for blocking of negative pressure vacuum pipeline Download PDFInfo
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- CN115815246A CN115815246A CN202211548978.2A CN202211548978A CN115815246A CN 115815246 A CN115815246 A CN 115815246A CN 202211548978 A CN202211548978 A CN 202211548978A CN 115815246 A CN115815246 A CN 115815246A
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- 238000010926 purge Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000000903 blocking effect Effects 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 85
- 239000011261 inert gas Substances 0.000 claims abstract description 77
- 238000005192 partition Methods 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims description 34
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000013101 initial test Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a reverse purging method and a reverse purging device for blocking a negative pressure vacuum pipeline, wherein the device comprises an inert gas source passage, and a pressurizing partition outlet valve and a pressurizing partition inlet valve which are arranged at the rear end of a pipeline easy to block; the method comprises the steps of firstly, introducing inert gas in a forward direction after the pipeline is blocked, testing the blocking degree, then, filling higher air pressure into a section of pipeline in a reverse direction, then, quickly opening a valve, carrying out reverse purging on the blocked pipe orifice by using the high pressure of the gas, repeatedly carrying out high-pressure purging for many times, then, introducing the inert gas in the forward direction again, and judging the dredging effect of back purging by comparing the time for reducing in the same pressure interval. The invention utilizes the inert gas through flow to carry out higher-pressure reverse purging, an inert gas source is connected to the front end of the pipeline which is easy to block in advance when the pipeline is built, a reverse flow pipeline is built, and the reverse purging can be realized by utilizing the gas storage tank, the gas collecting device, the evacuation pump set and the pressure gauges at all positions along the pipeline of the original system.
Description
Technical Field
The invention belongs to the technical field of vacuum negative pressure pipeline cleaning, and particularly relates to a reverse purging method and device for negative pressure vacuum pipeline blockage.
Background
To some vacuum negative pressure chemical industry pipelines, thereby because the less department of bore appears blocking in the pipeline and influences the pipeline normal flow because the material medium that has the powder circulates for a long time and causes the pipeline, the powder is piled up comparatively loosely in the short time, for timely handling the jam problem, many times need the manual system pipeline of disassembling to dredge inside, this operation has both destroyed vacuum pipe-line system's leakproofness and waste time and manpower, to some poisonous and harmful materials probably cause the injury to operating personnel at disassembling the in-process simultaneously.
Disclosure of Invention
The invention aims to provide a reverse purging method and a reverse purging device for blocking of a negative-pressure vacuum pipeline, which are used for solving one or more technical problems and realizing rapid dredging of the blocking problem in the pipeline under the condition of not disassembling the pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reverse purging device for blocking a negative pressure vacuum pipeline comprises an inert gas source passage, and a pressurizing partition outlet valve and a pressurizing partition inlet valve which are arranged at the rear end of a pipeline easy to block; the inert gas air source passage comprises a detection passage and a back flushing passage, the detection passage comprises an inert gas air source, an inert gas source pressure gauge, an inert gas electric regulating valve and a gas source partition valve which are sequentially connected, the gas source partition valve is connected with a gas storage tank inlet valve, the back flushing passage is connected between the inert gas electric regulating valve and a main passage valve, and a branch valve is arranged on a pipeline.
In the above technical scheme, a direct-current pipeline pressure gauge is arranged between the pressurizing blocking outlet valve and the pressurizing blocking inlet valve.
In the above technical scheme, the pressurizing blocking outlet valve and the pressurizing blocking inlet valve are arranged between the easily blocked pipeline outlet and the main line valve, and the pressurizing blocking outlet valve is arranged close to the easily blocked pipeline.
In the technical scheme, the device also comprises a gas storage tank pressure gauge, a gas collection tank pressure gauge and a pump front pressure gauge which are arranged on the normal material working passage.
A reverse purging method for negative pressure vacuum pipeline blockage comprises the following steps:
installing a reverse purging device in a normal material working passage;
(ii) before introducing normal materials, carrying out inert gas through-flow test on the easily blocked pipeline, and recording data;
(iii) when the pressure of the normal material working channel is abnormal, closing the normal material air source channel, evacuating the whole set of normal material working channel, and testing by adopting the inert gas through-flow test method which is the same as the step (ii) to judge whether the pipeline is easy to block or not;
(iv) after the easily blocked pipeline is determined to be blocked, closing a detection passage of the inert gas source passage, communicating a back flushing passage, and performing reverse purging on the easily blocked pipeline by using the high pressure of the inert gas;
and (v) repeating the high-pressure purging for multiple times, then performing the inert gas through-flow test again, judging whether to dredge or not by comparing the time for the same pressure interval to descend, and if not, repeating the step (iv).
In the above technical solution, the specific method for the inert gas through-flow test in step (ii) is as follows: starting a vacuum pump set, controlling the opening of an inert gas electric regulating valve, communicating an air source partition valve, an air storage tank inlet valve, an air storage tank outlet valve, a pressurizing partition inlet valve, a trunk valve, a gas collection tank inlet valve, a gas collection tank outlet valve and a vacuum pump set inlet valve, recording pressure values P1-P5 of an inert gas source pressure gauge, an air storage tank pressure gauge, a direct-current pipeline pressure gauge, a gas collection tank pressure gauge and a pressure gauge before a pump, then closing the air storage tank outlet valve, filling a fixed pressure P2 into the air storage tank, closing the inert gas electric regulating valve, re-opening the air storage tank outlet valve, continuously keeping through flow, measuring the time T1 of the pressure of the air storage tank from P2 to P2', completing the test and obtaining background contrast data.
In the above technical solution, the step (iii) of abnormal pressure in the normal material working path is specifically: an abnormality occurs in the pressure P3 of the direct-flow line pressure gauge.
In the above technical solution, all the valve opening degrees, the pressure P1 of the inert gas source pressure gauge and the fixed pressure P2 of the gas storage tank in the inert gas through-flow test in the steps (iii) and (vi) are the same as those in the step test.
In the above technical solution, the specific method for reverse purging in step (iv) is as follows: the method comprises the steps of closing a gas source partition valve, a gas storage tank inlet valve, a gas storage tank outlet valve, a pressurizing partition outlet valve, a main line valve, a gas collection tank inlet valve, a gas collection tank outlet valve and a vacuum pump set inlet valve, opening a branch valve and the pressurizing partition inlet valve, filling high pressure P3' into a pipeline between the pressurizing partition outlet valve and the pressurizing partition inlet valve by controlling the opening of an inert gas electric regulating valve, then closing the pressurizing partition inlet valve and the inert gas electric regulating valve, opening the gas source partition valve, the gas storage tank inlet valve, the gas storage tank outlet valve, the main line valve, the gas collection tank inlet valve, the gas collection tank outlet valve and the vacuum pump set inlet valve to form a reverse evacuation line, and then quickly opening the pressurizing partition outlet valve to enable high pressure in the pipeline to be filled into the pipeline to be easily blocked.
In the above technical solution, the criterion for judging whether to dredge in step (vi) is to perform an inert gas through-flow test again according to the method in step (ii), measure a time T3 when the pressure of the gas storage tank decreases from P2 to P2', and if the time T3 is shorter than a time T2 before the reverse purging and is close to the time T1 in the test in step (ii), dredge the blockage, otherwise, do not dredge the blockage.
In the above-mentioned technical solution,
the invention has the beneficial effects that:
the invention provides a reverse purging method and a reverse purging device for blocking a negative pressure vacuum pipeline, which can be used for rapidly treating the problem of blocking at a vacuum negative pressure small caliber part and saving labor and time cost; the method comprises the steps of judging under the condition of destroying the integrity and the tightness of a main process pipeline, finishing blockage cleaning, and reducing the damage of toxic and harmful substances to operators.
Drawings
FIG. 1 is a schematic structural diagram of a reverse purging device for negative pressure vacuum pipeline blockage according to the invention;
FIG. 2 is a diagram of a normal material working circuit in the present invention;
FIG. 3 is a schematic diagram of an inert gas test circuit according to the present invention;
FIG. 4 is a schematic diagram of an inert gas reverse pressurizing circuit according to the present invention;
FIG. 5 is a schematic diagram of an inert gas reverse purge in accordance with the present invention.
Wherein:
1 inert gas source 2 Normal Material gas source
3 gas storage tank 4 easy-to-block pipeline
5 gas collecting tank 6 vacuum pump set
7 inert gas electric regulating valve 8 normal material electric regulating valve
9 air source partition valve 10 air storage tank inlet valve
11 outlet valve 12 of gas storage tank is pressurized and is cut off outlet valve
13 pressurizing and isolating inlet valve 14 branch valve
15 trunk valve 16 gas collecting tank inlet valve
17 gas collection tank outlet valve 18 vacuum pump set inlet valve
19 inert gas source pressure gauge 20 gas storage tank pressure gauge
21 straight-flow pipeline pressure gauge 22 gas collecting tank pressure gauge
23 gauge before pump.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the drawings of the specification.
As shown in fig. 1, the normal material working path for cleaning 4 of the present invention includes a normal material gas source path, a gas storage tank inlet valve 10, a gas storage tank 3, a gas storage tank outlet valve 11, an easy-to-block pipeline 4, a main line valve 15, a gas collection tank inlet valve 16, a gas collection tank 5, a gas collection tank outlet valve 17, a vacuum pump set inlet valve 18, and a vacuum pump set 6, which are connected in sequence; the normal material air source passage comprises a normal material air source 2 and a normal material electric adjusting valve 8 which are connected with each other, and the normal material electric adjusting valve 8 is connected with an air storage tank inlet valve 10. When the normal material working path runs, a normal material working path as shown by an arrow in fig. 3 is formed, and normal material through flow is performed.
Example 1
As shown in fig. 1, a reverse purging device for blocking a negative pressure vacuum pipeline comprises an inert gas source passage, and a pressurizing blocking outlet valve 12 and a pressurizing blocking inlet valve 13 which are arranged at the rear end of an easy-to-block pipeline 4; the inert gas source passage comprises a detection passage and a back flushing passage, the detection passage comprises an inert gas source 1, an inert gas source pressure gauge 19, an inert gas electric regulating valve 7 and a gas source partition valve 9 which are sequentially connected, the gas source partition valve 9 is connected with a gas storage tank inlet valve 10, the back flushing passage is connected between the inert gas electric regulating valve 7 and a main valve 15, and a branch valve 14 is arranged on a pipeline; a direct-current pipeline pressure gauge 21 is arranged between the charging isolating outlet valve 12 and the charging isolating inlet valve 13.
The pressurizing partition outlet valve 12 and the pressurizing partition inlet valve 13 are arranged between the outlet of the pipeline 4 easy to block and the main line valve 15, and the pressurizing partition outlet valve 12 is arranged close to the pipeline 4 easy to block.
The reverse purging device for the negative pressure vacuum pipeline blockage further comprises a gas storage tank pressure gauge 20, a gas collection tank pressure gauge 22 and a pre-pump pressure gauge 23 which are arranged on a normal material working passage.
The invention utilizes the inert gas through flow to carry out higher-pressure reverse purging, namely, an inert gas source is connected to the front end of a pipeline which is easy to block in advance, a reverse flow pipeline is built, and the reverse purging can be realized by utilizing the gas storage tank, the gas collecting device, the evacuation pump group and the pressure gauges at various positions along the pipeline of the original system.
Example 2
Based on the device in the embodiment 1, the method for reversely purging the blocked negative pressure vacuum pipeline utilizes the inert gas through flow to reversely purge the higher pressure, and comprises the following steps:
setting of reverse purging device
An inert gas source interface is reserved at the front end of the pipeline 4 which is small in caliber and easy to block in advance at the beginning of pipeline design and building, an inert gas source 1 is connected, meanwhile, the inert gas source 1 is controlled to be connected and disconnected by an inert gas electric adjusting valve 7, and a bypass pipeline and related valves are added for the pipeline 4 which is easy to block.
(ii) initial inert gas flow test
Before normal materials are introduced, inert gas through-flow testing is carried out on an easily blocked pipeline 4 which is easily blocked, a vacuum pump set 6 is started, the opening degree of an inert gas electric adjusting valve 7 is controlled, an air source partition valve 9, an air storage tank inlet valve 10, an air storage tank outlet valve 11, a pressurizing partition outlet valve 12, a pressurizing partition inlet valve 13, a dry line valve 15, a gas collection tank inlet valve 16, a gas collection tank outlet valve 17 and a vacuum pump set inlet valve 18 are communicated, an inert gas testing route shown in figure 2 is formed, pressure values P1-P5 of an inert gas source pressure gauge 19, an air storage tank pressure gauge 20, a direct-current pipeline pressure gauge 21, a gas collection tank pressure gauge 22 and a pressure gauge 23 before a pump are recorded, then the air storage tank outlet valve 11 is closed, the air storage tank is filled with a fixed pressure of about P2, the inert gas electric adjusting valve 7 is closed, the air storage tank outlet valve 11 is opened again, through-flow is continuously kept, the time T1 of the pressure of the air storage tank 3 is measured, the pressure is reduced from P2 to P2', and accordingly early-stage testing is completed, and the data are reserved for convenient later stage comparison.
(iii) Normal stream circulation
When the device normally works, the inert gas electric regulating valve 7, the gas source partition valve 9 and the branch valve 14 are closed, the vacuum pump set 6 is started, the normal material electric regulating valve 8 is opened according to a process normal line, and the gas storage tank inlet valve 10, the gas storage tank outlet valve 11, the pressurizing partition outlet valve 12, the pressurizing partition inlet valve 13, the main line valve 15, the gas collection tank inlet valve 16, the gas collection tank outlet valve 17 and the vacuum pump set inlet valve 18 are communicated, so that a normal material working line as shown in fig. 3 is formed, and normal material through flow is performed.
(iv) post-blockage inert gas flow test
When the pipeline 4 easy to block is blocked and the pressure P3 of the direct-flow pipeline pressure gauge 21 is abnormal, the electric adjusting valve 8 for normal materials is closed, the normal materials in the whole pipeline are evacuated, then the inert gas through-flow test is performed again according to the method in the step (ii), the opening degree of all the valves and the pressure P1 of the inert gas source pressure gauge 19 are ensured to be consistent with those in the test in the step (ii), the pressure values P1-P5 of the inert gas source pressure gauge 19, the gas storage tank pressure gauge 20, the direct-flow pipeline pressure gauge 21, the gas collection tank pressure gauge 22 and the pressure gauge 23 before the pump during through-flow are recorded, then the outlet valve 11 of the gas storage tank is closed, the fixed pressure is filled into the gas storage tank by about P2, the electric adjusting valve 7 for inert gas is closed, the outlet valve 11 of the gas storage tank is opened again, the through-flow is continuously measured, the time T2 when the pressure of the gas storage tank is reduced from P2 to P2' is repeatedly measured, and if the time T2 is obviously higher than the previous time T1, the problem of blocking of the pipeline 4 easy to block occurs.
(v) reverse pressurizing and purging
Closing the gas source partition valve 9, the gas storage tank inlet valve 10, the gas storage tank outlet valve 11, the pressurizing partition outlet valve 12, the main line valve 15, the gas collection tank inlet valve 16, the gas collection tank outlet valve 17 and the vacuum pump set inlet valve 18, opening the branch valve 14, controlling the opening of the inert gas electric regulating valve 7 to fill a high pressure P3' into the pipeline between the pressurizing partition outlet valve 12 and the pressurizing partition inlet valve 13 to form an inert gas reverse pressurizing line as shown in FIG. 4, then closing the pressurizing partition inlet valve 13 and the inert gas electric regulating valve 7, opening the gas source partition valve 9, the gas storage tank inlet valve 10, the gas storage tank outlet valve 11, the main line valve 15, the gas collection tank inlet valve 16, the gas collection tank outlet valve 17 and the vacuum pump set inlet valve 18 to form a reverse evacuating line, then quickly opening the pressurizing partition outlet valve 12 to enable the high pressure in the pipeline to be filled into the easily blocked pipeline 4, and purging the inlet of the pipeline with a small diameter to form an inert gas reverse purging line diagram as shown in FIG. 5, and repeatedly performing the pressurizing operation for multiple times as shown in FIGS. 4 and 5.
(vi) inert gas flow through Re-check test
And (3) performing the inert gas through-flow test again according to the method in the step (ii), measuring the time T3 for the pressure of the gas storage tank to drop from P2 to P2', dredging the blockage situation if the time T3 is shorter than the time T2 before reverse purging and is close to the time T1 of the test in the step (ii), and continuing normal material through-flow work, and repeating the step (v) if the time T3 is still obviously longer than the time T1, continuing the reverse pressure charging and purging work of the inert gas, and properly increasing the pressure P3' and finally realizing the dredging of the pipeline by comparing the through-flow time.
According to the back flushing method, after the pipeline is blocked, firstly, the inert gas is introduced in the forward direction to test the blocking degree, then, the higher air pressure is filled into one section of the pipeline in the reverse direction, then, the valve is quickly opened to carry out reverse flushing on the blocked pipe orifice by utilizing the high pressure of the gas, so that the powder blocked at the small-caliber inlet can be favorably dredged, the inert gas is introduced in the forward direction again after repeated high-pressure flushing, the dredging effect of back flushing can be judged by comparing the time for reducing the same pressure interval, and accurate and effective blockage clearing is realized.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A reverse purging method for blocking of a negative pressure vacuum pipeline is characterized by comprising the following steps: the method comprises the following steps:
carrying out through-flow test on the pipeline easy to block by using inert gas, and recording original data;
(ii) when the pressure of the normal material working passage is abnormal, closing the normal material air source passage, and evacuating the whole set of normal material working passage;
(iii) performing through-flow test by adopting the same method as the step (i) to judge whether the pipeline easy to block is blocked or not;
(iv) after the blockage is determined, closing a detection passage of the inert gas source passage, communicating a back flushing passage, and performing reverse purging on the pipeline which is easy to block by using the high pressure of the inert gas;
and (v) repeating the high-pressure purging for multiple times, then performing the gas through-flow test again, judging whether to dredge or not by comparing the time for the same pressure interval to descend, and if not, repeating the step (iv).
2. The reverse purge method for negative pressure vacuum line plugging of claim 1, wherein: the through-flow test of step (i) comprises: (a) Testing the pressure data of each pressure gauge when the gas storage tank maintains stable pressure; and (b) measuring the time required for the pressure of the gas storage tank to drop by a fixed value.
3. The reverse purge method for negative pressure vacuum line plugging of claim 1, wherein: the pressure of the normal material working passage in the step (ii) is abnormal specifically as follows: the pressure of the pipeline between the pipeline and the gas collecting tank is easy to block and is abnormal.
4. The reverse purge method for negative pressure vacuum line plugging of claim 1, wherein: and (iii) and (v) the opening degree of all the valves, the pressure of the inert gas source and the fixed pressure of the gas storage tank in the gas through-flow test are the same as those in the step (ii).
5. The reverse purge method for negative pressure vacuum line plugging of claim 1, wherein: the reverse purging in the step (iv) comprises the following specific steps: the method comprises the steps of closing an air source partition valve (9), an air storage tank inlet valve (10), an air storage tank outlet valve (11), a pressurizing partition outlet valve (12), a main line valve (15), a gas collection tank inlet valve (16), a gas collection tank outlet valve (17) and a vacuum pump set inlet valve (18), opening a branch valve (14) and the pressurizing partition inlet valve (13), filling high pressure P3' into a pipeline between the pressurizing partition outlet valve (12) and the pressurizing partition inlet valve (13) by controlling the opening degree of an inert gas electric adjusting valve (7), then closing the pressurizing partition inlet valve (13) and the inert gas electric adjusting valve (7), opening the air source partition valve (9), the air storage tank inlet valve (10), the air storage tank outlet valve (11), the main line valve (15), the gas collection tank inlet valve (16), the gas collection tank outlet valve (17) and the vacuum pump set inlet valve (18), forming a reverse evacuation line, and then quickly opening the pressurizing partition outlet valve (12) to enable high pressure in the pipeline to be easily filled into the blocked pipeline (4).
6. The reverse purge method for negative pressure vacuum line plugging of claim 1, wherein: and (v) judging whether the standard of dredging is that the time required by the pressure of the gas storage tank to fall by the fixed value is close to the initial test time, dredging the blockage, and otherwise, dredging the blockage.
7. The utility model provides a reverse purging device to vacuum line blockage of negative pressure which characterized in that: comprises an inert gas source passage, a pressurizing partition outlet valve (12) and a pressurizing partition inlet valve (13) which are arranged at the rear end of an easy-to-block pipeline (4); the inert gas air source passageway is including detecting passageway and blowback passageway, detect the passageway and cut off valve (9) including inert gas air supply (1), inert gas pressure gauge (19), inert gas electric regulating valve (7) and the air supply that connects gradually, the air supply cuts off valve (9) and connects gas holder inlet valve (10), the blowback passageway is connected between inert gas electric regulating valve (7) and main road valve (15), and sets up branch valve (14) on the pipeline.
8. The reverse purge apparatus for negative pressure vacuum line plugging of claim 1, wherein: and a direct-current pipeline pressure gauge (21) is arranged between the pressurizing partition outlet valve (12) and the pressurizing partition inlet valve (13).
9. The reverse purge apparatus for negative pressure vacuum line plugging of claim 1, wherein: the pressurizing partition outlet valve (12) and the pressurizing partition inlet valve (13) are arranged between the outlet of the pipeline (4) easy to block and the main road valve (15), and the pressurizing partition outlet valve (12) is arranged close to the pipeline (4) easy to block.
10. The reverse purge apparatus for negative pressure vacuum line plugging of claim 1, wherein: the device also comprises a gas storage tank pressure gauge (20), a gas collection tank pressure gauge (22) and a pre-pump pressure gauge (23) which are arranged on the normal material working passage.
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| CN202211548978.2A CN115815246A (en) | 2022-12-05 | 2022-12-05 | Reverse purging method and device for blocking of negative pressure vacuum pipeline |
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