CN1259658A - Measuring method of vapour liquid two phase flow and its measuring equipment - Google Patents
Measuring method of vapour liquid two phase flow and its measuring equipment Download PDFInfo
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- CN1259658A CN1259658A CN 99115955 CN99115955A CN1259658A CN 1259658 A CN1259658 A CN 1259658A CN 99115955 CN99115955 CN 99115955 CN 99115955 A CN99115955 A CN 99115955A CN 1259658 A CN1259658 A CN 1259658A
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- 239000007788 liquid Substances 0.000 title claims abstract description 14
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000005251 gamma ray Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
一种可实现对蒸汽和水及其它汽液两相流量连续在线测量的方法及其装置,包括一倒置的U型管,U型管的上升和下降段分别对称安装两个文丘里管,首先测量两个文丘里管的压差,然后根据热体力学公式由计算机算出干度和流量。
A method and device capable of realizing continuous on-line measurement of steam, water and other vapor-liquid two-phase flows, comprising an inverted U-shaped tube, two Venturi tubes are symmetrically installed on the rising and falling sections of the U-shaped tube, first Measure the pressure difference of the two Venturi tubes, and then calculate the dryness and flow rate by the computer according to the thermodynamic formula.
Description
本发明属于测量技术领域，更进一步涉及一种测量水和蒸汽以及其它气(汽)液两相流量及干度的测量方法及其装置。The invention belongs to the technical field of measurement, and further relates to a method and a device for measuring water, steam and other gas (steam)-liquid two-phase flow and dryness.
水和蒸气、以及其它气(汽)液两相流动时，需要测量气体和液体的流量，到目前为止，尚无能在实际工程中应用的测量方法及装置。在测量干度方面，已有的仅为γ-射线衰减法测量气体和液体之比(称为干度)，锅炉中水和蒸汽两相流动，用一般方法难以测出其干度，目前国外常用的办法是利用γ-射线衰减法测量蒸汽干度，但这种方法难以普遍应用。When water and steam, and other gas (steam) liquid two-phase flow, need to measure the flow rate of gas and liquid, so far, there is no measurement method and device that can be applied in actual engineering. In terms of measuring dryness, the existing method is only to measure the ratio of gas and liquid (called dryness) by the gamma-ray attenuation method. The two-phase flow of water and steam in the boiler is difficult to measure its dryness by general methods. At present, foreign countries A common method is to measure the dryness of steam by using the γ-ray attenuation method, but this method is difficult to be widely used.
本发明的目的在于克服上述现有技术的缺点，提供一种可实现对蒸汽和水及其它气液两相流量连续在线测量的方法，本发明的另一个目的是提供一种测量稳定，精度高以及成本低的气液两相流量测量装置。The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a method for continuous on-line measurement of steam, water and other gas-liquid two-phase flows. Another purpose of the present invention is to provide a method with stable measurement and high precision. And a gas-liquid two-phase flow measuring device with low cost.
附图为本发明的结构原理图。Accompanying drawing is the structural principle diagram of the present invention.
下面结合附图对本发明作进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings.
本发明包括一倒置的U型管1，U型管1的上升和下降段分别对称安装两个文丘里管2。The invention comprises an inverted U-shaped pipe 1, and two Venturi pipes 2 are symmetrically installed on the ascending and descending sections of the U-shaped pipe 1, respectively.
本发明的流量与干度测量方法为：Flow and dryness measuring method of the present invention are:
首先测量两个文丘里管2的压差，然后根据公式(1)，(2)即可得到干度和流量。First measure the differential pressure of the two Venturi tubes 2, and then obtain the dryness and flow rate according to formulas (1) and (2).
当蒸汽和水混合物流过装置时在两个文丘里管处测量到压差ΔP1，ΔP2及压力∏。The pressure difference ΔP 1 , ΔP 2 and the pressure Π are measured at the two venturi tubes as the steam and water mixture flows through the device.
压差ΔP为重位压降和节流元件压降之和。The pressure difference ΔP is the sum of the pressure drop of the heavy position and the pressure drop of the throttling element.
ΔP1＝αρu2+ρgh (1)ΔP 1 =αρu 2 +ρgh (1)
ΔP2＝αρu2-ρgh (2)ΔP 2 =αρu 2 -ρgh (2)
上式中，ρ为蒸汽与水混合物密度，α为文丘里管流量系数。In the above formula, ρ is the density of the mixture of steam and water, and α is the flow coefficient of the Venturi tube.
ρ＝xρg+(1-x)ρl (3)ρ=xρ g +(1-x)ρ l (3)
x为蒸汽干度，下标g、l分别表示气体和液体。x is the dryness of steam, and the subscripts g and l represent gas and liquid respectively.
由式(1)和式(2)就可得到干度和混合物流量，进而得到蒸汽流量和水流量。From formula (1) and formula (2), the dryness and mixture flow rate can be obtained, and then the steam flow rate and water flow rate can be obtained.
本发明可用于蒸汽、流量及干度，气液两相流量及相比率的测量，具有不需要气液分离、精度高、设备简单的特点。The invention can be used for the measurement of steam, flow rate and dryness, gas-liquid two-phase flow rate and phase ratio, and has the characteristics of no need for gas-liquid separation, high precision and simple equipment.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115955 CN1128986C (en) | 1999-12-29 | 1999-12-29 | Measuring method of vapour liquid two phase flow and its measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115955 CN1128986C (en) | 1999-12-29 | 1999-12-29 | Measuring method of vapour liquid two phase flow and its measuring equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1259658A true CN1259658A (en) | 2000-07-12 |
| CN1128986C CN1128986C (en) | 2003-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99115955 Expired - Fee Related CN1128986C (en) | 1999-12-29 | 1999-12-29 | Measuring method of vapour liquid two phase flow and its measuring equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101525995B (en) * | 2009-04-22 | 2012-05-09 | 西安三林能源科技工程有限公司 | Gas and liquid multiphase quantitative measuring device and method thereof |
| CN103438942A (en) * | 2013-08-26 | 2013-12-11 | 中国核动力研究设计院 | Double venturi tubes |
| CN103438931A (en) * | 2013-08-26 | 2013-12-11 | 中国核动力研究设计院 | Integrated moist steam flow dryness measuring device and measuring method |
| CN103453962A (en) * | 2013-09-11 | 2013-12-18 | 盘锦辽河油田辽南集团有限公司 | Device and method for measuring flow and steam dryness of steam-water two-phase fluid in real time |
-
1999
- 1999-12-29 CN CN 99115955 patent/CN1128986C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101525995B (en) * | 2009-04-22 | 2012-05-09 | 西安三林能源科技工程有限公司 | Gas and liquid multiphase quantitative measuring device and method thereof |
| CN103438942A (en) * | 2013-08-26 | 2013-12-11 | 中国核动力研究设计院 | Double venturi tubes |
| CN103438931A (en) * | 2013-08-26 | 2013-12-11 | 中国核动力研究设计院 | Integrated moist steam flow dryness measuring device and measuring method |
| CN103438931B (en) * | 2013-08-26 | 2016-01-20 | 中国核动力研究设计院 | Wet steam flow mass dryness fraction integrated measurer and measuring method |
| CN103438942B (en) * | 2013-08-26 | 2016-05-25 | 中国核动力研究设计院 | Double-venturi tube |
| CN103453962A (en) * | 2013-09-11 | 2013-12-18 | 盘锦辽河油田辽南集团有限公司 | Device and method for measuring flow and steam dryness of steam-water two-phase fluid in real time |
| CN103453962B (en) * | 2013-09-11 | 2015-12-30 | 盘锦辽河油田辽南集团有限公司 | Steam-water two-phase body flow and steam quality real-time measurement apparatus and measuring method thereof |
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| Publication number | Publication date |
|---|---|
| CN1128986C (en) | 2003-11-26 |
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Owner name: XIAN KAIR ENERGY ENGINEERING CO., LTD. Free format text: FORMER OWNER: XI'AN COMMUNICATION UNIV. Effective date: 20080111 |
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Effective date of registration: 20080111 Address after: Room 310, information building, No. 9, three hi tech Road, Shaanxi, Xi'an Patentee after: Xi'an Kaier Energy Engineering Co., Ltd. Address before: No. 28, Xianning Road, Xi'an, Shaanxi Patentee before: Xi'an Jiaotong University |
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