CN100468061C - Non-blocking primary air speed measuring device - Google Patents
Non-blocking primary air speed measuring device Download PDFInfo
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- CN100468061C CN100468061C CNB2007100108707A CN200710010870A CN100468061C CN 100468061 C CN100468061 C CN 100468061C CN B2007100108707 A CNB2007100108707 A CN B2007100108707A CN 200710010870 A CN200710010870 A CN 200710010870A CN 100468061 C CN100468061 C CN 100468061C
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Abstract
The present invention relates to the measuring of the quantity of flow or the flow speed, a one-time wind speed measuring device without blockage, a total pressure tube and a static pressure tube. A differential pressure transducer is positioned between the total pressure tube and the static pressure tube, and small air flows in the total pressure tube and the static pressure tube in the direction of the pressure obtaining port. The small air flow can resist the diffusing of the coal powder in to the pressure tube. The present invention which is not in a traditional thinking mode solves the problems of blocking skillfully and assures that the pneumatics property of the pressure obtaining elements is not changed and improves the measuring precision. The method for measuring in the present invention brings convenient for users without on-the-spot demarcating and debugging. The device and method having no requirement of dust concentration in the present can be used for measuring a direct-flowing system or sending powder to replace the air and can also be used in other occasions of higher dust concentration.
Description
Technical field:
The present invention relates to flow velocity or flow measurement field, particularly dust-contained airflow flow measurement device.
Background technology:
Importance for the boiler of power plant primary air speed measuring is known together widely, and it is that indispensable important parameter is adjusted in boiler combustion, and it has great significance for stability, economy and the reliability of burning.But it is measured is a difficult problem always, and original mode of surveying static pressure that adopts is monitored wind one time, and it is more scientific and reasonable just to propose directly to survey primary air velocity in recent years, and the device of existing direct measuring wind is as follows:
Directly measure, fact proved that this method can not be suitable for a wind of dust-laden with common dynamic pressure pressure element and differential pressure transmitter.
Get total head by the elbow, measurement data is through demarcating and the Computer Processing correction, and this method has solved the obstruction of wearing and tearing but not solving measuring tube, only has a small amount of power plant to use.
Employing adds compression air probe in survey total head static pressure element head and purges, and avoids the mouth of pipe to stop up.
On the pressure element, add rapping and setting chamber.
Now exhausted most power plant all adopts directly blows system, and one time wind band powder rate is very high, and the measurement difficulty of primary air velocity is bigger, and developing the measuring system that can adapt to the high concentration wind powder mixture is the important topic of pendulum in face of work about electric power person.Wind is measured at first will solve three difficult problems: how to guarantee the accuracy measured; How to solve the obstruction of measuring sensor and pipeline; Select for use scientific and reasonable pressure obtaning device can solve the problem of accuracy, select high abrasion resisting material serviceable life of director's measuring sensor to greatest extent for use, the most scabrous is to stop up, in recent years, a large amount of research and developments has been done at disposable measuring wind speed by domestic how tame scientific research institutions and universities and colleges, working out some pointedly has anti-block apparatus and a measure, such as utilize from sedimentation and rapping mode from deashing anti-clogging wind speed measuring device and utilize anti-block apparatus that the pressurized air probe purges etc.Clogging-preventing measures all concentrates on the head of pressure pipe, can not fundamentally stop the generation of latch up phenomenon like this.
Summary of the invention:
The objective of the invention is to overcome above-mentioned not enough problem, a kind of non-blocking primary air speed measuring device is provided, measuring principle advanced person, measure accurately, never stop up, be widely used.
The technical scheme that the present invention is adopted for achieving the above object is: non-blocking primary air speed measuring device, relate to total head pressure pipe and static pressure pressure pipe, between total head pressure pipe and the static pressure pressure pipe pipeline differential pressure transmitter is housed, mobile weak gas flow in total head pressure pipe and the static pressure pressure pipe, airflow direction is towards the pressure port direction.Weak gas flow can be resisted the ability that coal dust spreads just in the pressure pipe.
Described total head pressure pipe and static pressure pressure pipe are connected same voltage stabilizing gas tank, and the voltage stabilizing gas tank provides the constant speed weak gas flow to flow to the pressure port along total head pressure pipe and static pressure pressure pipe.
Described voltage stabilizing gas tank is connected compressed air gas source, and air deposits the voltage stabilizing gas tank in behind voltage stabilizing, filtration, purification plant.
Described weak gas flow flow control partly between voltage stabilizing gas tank and the total head pressure pipe minute-pressure difference transmitter being housed, is equipped with speed-regulating valve and flow controller on the pipeline between voltage stabilizing gas tank and the minute-pressure difference transmitter successively.
Described weak gas flow volume control device is installed in the switch board.
It is 0-1.6KPa that described differential pressure transmitter and differential pressure transmitter adopt range, power supply 24VDC, output 4-24mA.
The dynamic pressure value of described differential pressure transmitter collection is transferred to data acquisition and the disposal system treatment conversion becomes velocity amplitude, is converted into standard 4-24mA signal and exports to the DCS system, and at this moment 4-24mA corresponding speed value is 0-50m/s.
The present invention has broken through traditional mode of thinking, has solved blocking problem very dexterously, has guaranteed that the aerodynamic properties of pressure element does not change, and then has improved the precision of measuring.The present invention solves blockage problem and starts with from the origin cause of formation of stopping up, find through a large amount of case studies, taking place to stop up not is main head (pressure tappings place) at the pressure pipe, most obstruction all occurs in the pressure pipeline, do not have when the pressure pipeline under the situation of leak point, there is not pressure gradient in pressure pipe and the tested buret, there is not air current flow in the pipe, can not advance coal dust in the pipe under the common thinking, but in fact coal dust enters into pipeline really, this is because in airduct and the pressure pipeline bigger concentration gradient and thermograde are arranged, these all can cause the transmission of quality, coal dust is diffused into sedimentation again in the pressure pipeline, and the vibration of pressure pipeline is deposited in a low-lying or flex point place formation obstruction with coal dust.
The present invention is directed to the substantive reason of above-mentioned obstruction, in measuring pipeline, be provided with the reverse diffusion of one air-flow, effectively prevent coal dust in the pressure pipeline, to spread, thereby really play anticlogging effect along the pressure port.By ignoring to the influence of measuring accuracy to the analysis of diffusive force and a large amount of faint air-flows of this strand that experiment showed.For the numerical value that guarantees to measure more accurate, air-flow velocity in total head pressure pipe and the static pressure pressure pipe is consistent, by little air flow rate control section control, guarantee that more effectively the pressure reduction that the differential pressure transmitter between total head pressure pipe and static pressure pressure pipe is measured is the dynamic pressure value, and then obtain the flow velocity of an accurate wind.Owing to there is weak gas flow to flow at the pressure mouth of pipe, formed a faint air film at pressure mouth of pipe place, the formation of this air film has also strengthened the wear resistance of the mouth of pipe, pressure element long service life.Total head and static pressure pressure element connect together, and it are directly inserted in the straight length of an airduct get final product, and pressure table pipe is more concentrated, and very convenient laying is beautiful and clean.Be different from other wind measuring system on the using method, need not on-site proving and debugging, the direct corresponding speed value of the standard 4-24mA signal of output is 0-50m/s, generous user.The present invention does not require dust concentration in the tested air-flow, can measure direct-firing system and can be used for transporting pulverized coal with exhaust gas yet, also can be used for the occasion of higher dust concentration in other industry, can use in power plant transforms and can use in new power plant construction yet.
Description of drawings:
Fig. 1 is a measuring principle synoptic diagram of the present invention.
Fig. 2 is a measuring process system diagram of the present invention
Embodiment:
Non-blocking primary air speed measuring device as shown in Figure 1, flow in airduct of power plant 1 coal dust of containing airflow is arranged, total head pressure pipe 3 and static pressure pressure pipe 6 are installed on airduct 1 of power plant, between total head pressure pipe 3 and static pressure pressure pipe 6 pipelines differential pressure transmitter 4 is housed, the range of differential pressure transmitter is 0-1.6KPa, power supply 24VDC, output 4-24mA, total head pressure pipe 3 and static pressure pressure pipe 6 are connected same voltage stabilizing gas tank 5, operation valve and throttling valve 8 are housed on the pipeline, voltage stabilizing gas tank 5 provides the constant speed weak gas flow to flow to pressure port 2 along total head pressure pipe 3 and static pressure pressure pipe 6, voltage stabilizing gas tank 5 is connected instrument wind compressed air gas source, through voltage stabilizing, filter, air deposits voltage stabilizing gas tank 5 in behind the purification plant.The dynamic pressure value that differential pressure transmitter 4 is gathered is transferred to data acquisition and the disposal system treatment conversion becomes velocity amplitude, is converted into standard 4-24mA signal and exports to the DCS system, and at this moment 4-24mA corresponding speed value is 0-50m/s.
For guaranteeing that the weak gas flow flow velocity equates in total head pressure pipe and the static pressure pressure pipe, as shown in Figure 2, weak gas flow flow control part is housed, it is 0-1.6KPa between voltage stabilizing gas tank 5 and the total head pressure pipe 3 range being housed, power supply 24VDC, the minute-pressure difference transmitter 7 of output 4-24mA is equipped with speed-regulating valve 10 and flow controller 9 on the pipeline between voltage stabilizing gas tank 5 and the minute-pressure difference transmitter 7 successively.The weak gas flow volume control device is installed in the unillustrated in the drawings switch board.
Non-blocking primary air speed measuring device as shown in Figure 1, new power plant construction directly blows to flow in airduct of system 1 air and coal dust mixed airflow, total head pressure pipe 3 and static pressure pressure pipe 6 are installed on airduct 1 of power plant, between total head pressure pipe 3 and static pressure pressure pipe 6 pipelines differential pressure transmitter 4 is housed, the range of differential pressure transmitter is 0-1.6KPa, power supply 24VDC, output 4-24mA, total head pressure pipe 3 and static pressure pressure pipe 6 pipelines are connected same voltage stabilizing gas tank 5, voltage stabilizing gas tank 5 provides the constant speed weak gas flow to flow to pressure port 2 along total head pressure pipe and static pressure pressure pipe, the dynamic pressure value that differential pressure transmitter 4 is gathered is transferred to data acquisition and the disposal system treatment conversion becomes velocity amplitude, be converted into standard 4-24mA signal and export to the DCS system, at this moment 4-24mA corresponding speed value is 0-50m/s.
Claims (7)
1, non-blocking primary air speed measuring device, relate to total head pressure pipe and static pressure pressure pipe, between total head pressure pipe and the static pressure pressure pipe pipeline differential pressure transmitter is housed, it is characterized in that: weak gas flow flows in total head pressure pipe (3) and the static pressure pressure pipe (6), the weak gas flow speed that flows in total head pressure pipe and the static pressure pressure pipe equates that airflow direction is towards pressure port (2) direction.
2, non-blocking primary air speed measuring device according to claim 1, it is characterized in that: total head pressure pipe and static pressure pressure pipe are connected same voltage stabilizing gas tank (5), and the voltage stabilizing gas tank provides the constant speed weak gas flow to flow to the pressure port along total head pressure pipe and static pressure pressure pipe.
3, non-blocking primary air speed measuring device according to claim 2 is characterized in that: voltage stabilizing gas tank (5) is connected compressed air gas source, and air deposits the voltage stabilizing gas tank in behind voltage stabilizing, filtration, purification plant.
4, according to claim 2 or 3 described non-blocking primary air speed measuring devices, it is characterized in that: the weak gas flow flow control partly between voltage stabilizing gas tank (5) and the total head pressure pipe (3) minute-pressure difference transmitter (7) being housed, is equipped with speed-regulating valve (10) and flow controller (9) successively on the pipeline between voltage stabilizing gas tank and the minute-pressure difference transmitter.
5, non-blocking primary air speed measuring device according to claim 1 is characterized in that: the weak gas flow volume control device is installed in the switch board.
6, non-blocking primary air speed measuring device according to claim 4 is characterized in that: the range of differential pressure transmitter (4) and differential pressure transmitter (7) is 0-1.6KPa, power supply 24VDC, output 4-24mA.
7, non-blocking primary air speed measuring device according to claim 1, it is characterized in that: the dynamic pressure value that differential pressure transmitter (4) is gathered is transferred to data acquisition and the disposal system treatment conversion becomes velocity amplitude, be converted into standard 4-24mA signal and export to the DCS system, at this moment 4-24mA corresponding speed value is 0-50m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100108707A CN100468061C (en) | 2007-04-03 | 2007-04-03 | Non-blocking primary air speed measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100108707A CN100468061C (en) | 2007-04-03 | 2007-04-03 | Non-blocking primary air speed measuring device |
Publications (2)
| Publication Number | Publication Date |
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| CN101038296A CN101038296A (en) | 2007-09-19 |
| CN100468061C true CN100468061C (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100108707A Expired - Fee Related CN100468061C (en) | 2007-04-03 | 2007-04-03 | Non-blocking primary air speed measuring device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410856B (en) * | 2011-11-30 | 2014-03-19 | 张益民 | Gas flow rate and flow measurement instrument and measurement method |
| CN103395452B (en) * | 2013-08-08 | 2015-06-10 | 河南第一火电建设公司 | Wireless remote control wind speed measurement robot |
| CN104422602B (en) * | 2013-08-21 | 2018-11-23 | 上海宝钢工业技术服务有限公司 | Isokinetic sampling's method that stationary source is unpowered |
| CN106525154A (en) * | 2016-09-30 | 2017-03-22 | 张英志 | Measurement device for tail gas flow exhausted by car under actual driving condition |
| CN107830305B (en) * | 2017-11-07 | 2024-04-02 | 成都易态科技有限公司 | Pressure taking system |
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2007
- 2007-04-03 CN CNB2007100108707A patent/CN100468061C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 锅炉风量监测系统堵塞问题的解决办法. 冯晓露，岑可法.电站系统工程，第21卷第2期. 2005 |
| 锅炉风量监测系统堵塞问题的解决办法. 冯晓露，岑可法.电站系统工程，第21卷第2期. 2005 * |
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| CN101038296A (en) | 2007-09-19 |
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Granted publication date: 20090311 Termination date: 20120403 |