CN101435729B - Pressure measuring blocking-proof method and device - Google Patents
Pressure measuring blocking-proof method and device Download PDFInfo
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- CN101435729B CN101435729B CN2008101815023A CN200810181502A CN101435729B CN 101435729 B CN101435729 B CN 101435729B CN 2008101815023 A CN2008101815023 A CN 2008101815023A CN 200810181502 A CN200810181502 A CN 200810181502A CN 101435729 B CN101435729 B CN 101435729B
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- valve
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- gas
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Abstract
The invention relates to an anti-clogging method and a device for measuring pressure under dusty state by using a reducing, adjusting and sampling valve with adjustable section as a main component. The method comprises the following steps: in order to prevent particles and dust in a furnace from clogging a piezometric sampling tube, adjusting flow by a self-operated flow adjusting valve to make certain amount of gas flush the piezometric sampling tube, controlling the flow to be between 0.5 and 1.5 m<3> per hour, causing measuring error by gas resistance (generally reaching 30 to 150H2 Omm) of a piezometric eduction tube, and overcoming the measuring error by a reducing adjusting valve to ensure that the measuring pressure of the sampling tube is equal to actual pressure in the furnace and not influenced by change of gas flow, so as to accurately measure the pressure in the furnace. The method and the device have the advantages of reliable running, convenient adjustment, measuring accuracy up to 1H2 Omm, and no clogging.
Description
Technical field
The present invention relates to a kind of reducing and regulate many dirt state pressure (negative pressure) measurement anti-blockage method and the device that sample valve is formed by variable-area.
Background technology
At present many dirt, the easy obstruction in the pressure survey of measuring pipeline, as the stove that uses in chemical engineering industry, building materials industry, the petroleum industry, ebullated bed, fluidized bed, sand stove etc., because the solid particle dust in the siege is in high temperature and fluidized state about 1000 ℃, pressure test point and pipeline very easily stop up, and influence is operation normally.And in case obstruction has to use artificial the purging when stopping to measure.Sometimes adopt the method that in pipeline, feeds a small amount of gas continuously, be splashed into obstruction to prevent dust granule, but caused test error simultaneously.The big more then error of gas flow is big more, and usually error is up to 5～10%, thereby can not control the stove device exactly and move under normal operating mode, influenced the work efficiency of device and strengthened energy resource consumption.Up to the present the document patent and the product that still do not have solution.
Summary of the invention
The invention provides a kind of reliable, easy to adjust, measuring accuracy is high, nonclogging pressure-measuring system method and apparatus.Be fit to the pressure survey of siege under the various severe environmental conditions.Measuring error can reduce an order of magnitude (more than 10 times).
According to an aspect of the present invention, provide a kind of pressure survey preventing clogging up device, having comprised:
Measure fairlead 2 for one, the inner of this measurement fairlead 2 passes in the stove 1 for the treatment of pressure measurement, and the outer end connects a reducing with thief hole 4 and regulates sample valve 3;
This reducing is regulated flowmeter 6 and the tensimeter 5 of sample valve 3 by pipeline and measurement gas flow and pressure, and continuous in order to the flow control valve 7 of relying on oneself of adjusting gas flow, the gas at thief hole 4 places of this reducing adjusting sample valve 3 of flowing through can be regulated sample valve 3 by reducing by the cross section and regulate;
A pressure unit is regulated the pressure at thief hole 4 places of sample valve 3 in order to flow through this reducing of measurement.
According to a further aspect in the invention, provide a kind of pressure measurement anti-blockage method, may further comprise the steps:
Measuring fairlead with one passes in the stove for the treatment of pressure measurement;
The outer end of this measurement fairlead is connected a reducing adjusting sample valve with thief hole;
To be installed in this reducing in order to the flowmeter of measurement gas flow and pressure and tensimeter and in order to the flow control valve of relying on oneself of adjusting gas flow in the pipeline and regulate on the pipeline that sample valve is connected, the gas of adjusting the thief hole place of this reducing adjusting sample valve passes through the cross section, thereby regulate the flow velocity of this valve gas of flowing through, make the gas flow rate v of this gas by this cross section
1Gas flow rate v with the section that passes to this measurement fairlead the inner in the stove
2Satisfy relational expression
Wherein, ξ measures the pipe resistance coefficient of fairlead for this;
Adopt pressure transmitter measurement this reducing of flowing through to regulate the pressure of gas at the thief hole place of sample valve, this pressure that records is the interior pressure of this stove.
Description of drawings
Fig. 1 is the system diagram that many dirt of the present invention state downforce is measured anti-blockage method.
Fig. 2 is the structural representation that reducing shown in Figure 1 is regulated the first kind of structure-side valve type reducing sample valve of sample valve.
Fig. 3 is the structural representation that reducing shown in Figure 1 is regulated the second kind of structure-pin type reducing sample valve of sample valve.
Fig. 4 is the structural representation that reducing shown in Figure 1 is regulated the third structure-rotary valve reducing sample valve of sample valve.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further details.
As shown in Figure 1, measuring the pass through cross section of fairlead 2 outer ends, make the dynamic pressure of gas equate that with the air resistance of fairlead part the pressure of measurement sampling spot is the true pressure in the stove by reducing adjusting sample valve 3 change gases.Measure gas flow in the fairlead by factor decisions such as the grain size of dust in the stove and flowing velocities, flow control valve 7 is adjusted by relying on oneself.This flow control valve 7 of relying on oneself is used for the flow of the gas in the control survey fairlead 2, and the flow velocity in the holding tube is not subjected to the variation of gaging pressure to cause the variation of flow, prevents this line clogging.Flowmeter 6, tensimeter 5 are read the flow and the pressure of gas.
The gas that feeds is set up by the flow control valve 7 of relying on oneself and is required flow, is shown by flowmeter 6.Gas is regulated through reducing
SamplingThe I of valve 3-I cross section, II-II cross section of measurement fairlead 2 flows in the stove and delivers to pressure transmitter measurement by the road by thief holes 4 in the reducing adjusting sample valve 3 simultaneously.
If: reducing is regulated the cross section I-I at thief hole 4 places of sample valve 3, the area of section at measurement fairlead section II-II place of an end in stove is respectively S
1And S
2, pressure is respectively P
1And P
2, flow velocity is respectively v
1And v
2, highly be respectively Z
1And Z
2, γ is a gas severe.
Cross section I-I is ξ to the pipe resistance coefficient between section II-II, and resistance consumption can be hw.
Relation between above-mentioned each parameter satisfies Bernoulli equation:
Referring to Fig. 1 as can be known, cross section I-I and section II-II are in the two ends of measuring fairlead 2 respectively, and it is a series pipe, so the flow of these two sections equates.
Through testing, the inventor finds, passes through area of section as long as the change reducing is regulated the gas at thief hole 4 places of sample valve 3, makes the gas flow rate v at the I-I place, this cross section that flows through
1And the gas flow rate v at this section II-II place that flows through
2Satisfy
(formula (2)), the pressure P at I-I place, this cross section
1Promptly equal the pressure P at section II-II place
2, and be not subjected to the influence of gas flow in the pipeline.In other words, in the case, the P that records by pressure unit
2It is exactly the pressure P in the stove
1
Wherein, v
1, v
1, ξ can measure by known any method.
According to a preferred embodiment of the present invention, what be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of guiding valve, as shown in Figure 2, this guiding valve comprises spool (9a) and nut (10a), this spool (9a) is processed with wide 3 millimeters skewed slot vertically at outside surface, by handling nut (10a), can promote this spool (9a) and move 20 millimeters vertically, the change that moves axially of spool (9a) is regulated the gas that the thief hole (4) of sample valve (3) locates through this reducing and is passed through the cross section.
What according to another preferred embodiment of the invention, be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of needle-valve.As shown in Figure 3, this needle-valve comprises spool (9b) and valve seat (10b), the external process of this spool (9b) has screw thread, by twisting spool (9b), change the awl end of spool (9b) and the distance between the valve seat (10b), pass through the cross section thereby change the gas of locating through the thief hole (4) of this reducing adjusting sample valve (3).
According to another preferred embodiment of the present invention, what be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of rotary valve.As shown in Figure 4, this rotary valve comprises spool (9c) and valve body (8c), this spool (9c) is a cylinder rotatable, go up the corresponding inclined to one side circular hole that is processed with at this spool (9c) and valve body (8c), change the gas of locating through the thief hole (4) of this reducing adjusting sample valve (3) by rotational valve core (9c) and pass through the cross section.
Claims (8)
1. pressure measurement anti-blockage method may further comprise the steps:
Measuring fairlead with one passes in the stove for the treatment of pressure measurement;
The outer end of this measurement fairlead is connected a reducing adjusting sample valve with thief hole;
To also be installed in this reducing in order to the flowmeter of measurement gas flow and pressure and tensimeter and regulate on the pipeline that sample valve is connected;
To be installed in order to the flow control valve of relying on oneself of adjusting gas flow in the pipeline with this reducing and regulate on the pipeline that sample valve is connected, the flow of the gas in the described measurement fairlead of this Flux Valve Control of relying on oneself makes it not to be subjected to the variation of gaging pressure and changes;
The gas of adjusting the thief hole place of described reducing adjusting sample valve passes through the cross section, this gas is equated with the air resistance of measuring fairlead by the gas dynamic pressure of section, thereby the gaging pressure at thief hole place is equated with the internal pressure of stove;
Adopt the pressure unit measurement described reducing of flowing through to regulate the pressure of gas at the thief hole place of sample valve.
2. pressure measurement anti-blockage method according to claim 1, it is characterized in that described reducing adjusting sample valve adopts the structure of guiding valve, this guiding valve comprises spool and nut, this spool is processed with wide 3 millimeters skewed slot vertically at outside surface, by handling nut, make this spool move 20 millimeters vertically, the gas that moves axially the thief hole place that changes described reducing adjusting sample valve of spool passes through the cross section.
3. pressure measurement anti-blockage method according to claim 1, it is characterized in that described reducing adjusting sample valve adopts the structure of needle-valve, this needle-valve comprises spool and valve seat, the external process of this spool has screw thread, by the twisting spool, change the awl end of spool and the distance between the valve seat, thereby the gas that changes the thief hole place of described reducing adjusting sample valve passes through the cross section.
4. pressure measurement anti-blockage method according to claim 1, it is characterized in that described reducing adjusting sample valve adopts the structure of rotary valve, this rotary valve comprises spool and valve body, this spool is a cylinder rotatable, correspondingly on described spool and valve body be processed with inclined to one side circular hole, change described reducing by rotational valve core and regulate the gas at the thief hole place of sample valve and pass through the cross section.
5. pressure survey preventing clogging up device comprises:
Measure fairlead for one, the inner of this measurement fairlead passes in the stove for the treatment of pressure measurement, and the outer end connects a reducing with thief hole and regulates sample valve;
Be installed in described reducing regulate on the pipeline that sample valve is connected in order to the flowmeter of measurement gas flow and pressure and tensimeter and in order to the flow control valve of relying on oneself of gas flow in the adjustment pipeline, the flow of the gas in the described measurement fairlead of this Flux Valve Control of relying on oneself makes it not to be subjected to the variation of gaging pressure and changes;
A pressure unit is regulated the pressure of gas at the thief hole place of sample valve in order to flow through described reducing of measurement;
The gas that described reducing is regulated the thief hole place of sample valve is variable by the cross section.
6. pressure survey preventing clogging up device according to claim 5, it is characterized in that described reducing adjusting sample valve adopts the structure of guiding valve, this guiding valve comprises spool and nut, this spool is processed with wide 3 millimeters skewed slot vertically at outside surface, by handling nut, make this spool move 20 millimeters vertically, the gas that moves axially the thief hole place that changes described reducing adjusting sample valve of spool passes through the cross section.
7. pressure survey preventing clogging up device according to claim 5, it is characterized in that described reducing adjusting sample valve adopts the structure of needle-valve, this needle-valve comprises spool and valve seat, the external process of this spool has screw thread, by the twisting spool, change the awl end of spool and the distance between the valve seat, thereby the gas that changes the thief hole place of described reducing adjusting sample valve passes through the cross section.
8. pressure survey preventing clogging up device according to claim 5, it is characterized in that described reducing adjusting sample valve adopts the structure of rotary valve, this rotary valve comprises spool and valve body, this spool is a cylinder rotatable, correspondingly on described spool and valve body be processed with inclined to one side circular hole, change described reducing by rotational valve core and regulate the gas at the thief hole place of sample valve and pass through the cross section.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99125568 CN1252523B (en) | 1999-12-06 | 1999-12-06 | Choke preventing method and device for pressure measurement |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99125568 Division CN1252523B (en) | 1999-12-06 | 1999-12-06 | Choke preventing method and device for pressure measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101435729A CN101435729A (en) | 2009-05-20 |
| CN101435729B true CN101435729B (en) | 2010-11-24 |
Family
ID=5284014
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99125568 Expired - Lifetime CN1252523B (en) | 1999-12-06 | 1999-12-06 | Choke preventing method and device for pressure measurement |
| CN2008101815023A Expired - Fee Related CN101435729B (en) | 1999-12-06 | 1999-12-06 | Pressure measuring blocking-proof method and device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99125568 Expired - Lifetime CN1252523B (en) | 1999-12-06 | 1999-12-06 | Choke preventing method and device for pressure measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1252523B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252523B (en) * | 1999-12-06 | 2012-11-14 | 谢心良 | Choke preventing method and device for pressure measurement |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852210A (en) * | 2012-12-03 | 2014-06-11 | 中国长江电力股份有限公司 | Anti-blocking apparatus for piezometer tube of water turbine |
| CN104913875A (en) * | 2014-03-11 | 2015-09-16 | 任广营 | Online dredging anti-blocking sampler |
| CN105910753B (en) * | 2016-05-09 | 2019-02-22 | 华东理工大学 | A kind of cinder notch pressure difference measuring device and its method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3295374A (en) * | 1963-03-25 | 1967-01-03 | Yawata Iron & Steel Co | Method and device for measuring pressure of fluid in vessel |
| GB1134101A (en) * | 1964-09-01 | 1968-11-20 | Babcock & Wilcox Ltd | Improvements in or relating to pressure devices |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252523B (en) * | 1999-12-06 | 2012-11-14 | 谢心良 | Choke preventing method and device for pressure measurement |
-
1999
- 1999-12-06 CN CN 99125568 patent/CN1252523B/en not_active Expired - Lifetime
- 1999-12-06 CN CN2008101815023A patent/CN101435729B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3295374A (en) * | 1963-03-25 | 1967-01-03 | Yawata Iron & Steel Co | Method and device for measuring pressure of fluid in vessel |
| GB1134101A (en) * | 1964-09-01 | 1968-11-20 | Babcock & Wilcox Ltd | Improvements in or relating to pressure devices |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平10-273712A 1998.10.13 |
| JP特开平11-281512A 1999.10.15 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252523B (en) * | 1999-12-06 | 2012-11-14 | 谢心良 | Choke preventing method and device for pressure measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1252523A (en) | 2000-05-10 |
| CN1252523B (en) | 2012-11-14 |
| CN101435729A (en) | 2009-05-20 |
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