CN205991821U - Double ratio method dampness liquid phase content measurement apparatus - Google Patents

Double ratio method dampness liquid phase content measurement apparatus Download PDF

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Publication number
CN205991821U
CN205991821U CN201620799635.7U CN201620799635U CN205991821U CN 205991821 U CN205991821 U CN 205991821U CN 201620799635 U CN201620799635 U CN 201620799635U CN 205991821 U CN205991821 U CN 205991821U
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China
Prior art keywords
differential pressure
pressure
throat
transmitter
downstream
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Expired - Fee Related
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CN201620799635.7U
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Chinese (zh)
Inventor
徐英
张涛
袁超
吴海涛
李涛
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Tianjin University
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Tianjin University
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Priority to CN201620799635.7U priority Critical patent/CN205991821U/en
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Expired - Fee Related legal-status Critical Current
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Abstract

This utility model is related to a kind of pair of ratio method dampness liquid phase content measurement apparatus, including long throat Venturi meter road and three differential pressure transmitters:First differential pressure transmitter and the second differential pressure transmitter and the 3rd differential pressure transmitter, respectively arrange at a pressure at the upstream in long throat Venturi meter road, throat's middle and lower reaches position and downstream, the two external pressure guiding pipes picking out at upstream and throat's middle and lower reaches position two pressure are coupled with the first differential pressure transmitter, and the two external pressure guiding pipes picking out at the position pressure of throat's middle and lower reaches and at the pressure of downstream straight length after expansion segment outlet are coupled with the second differential pressure transmitter;The two external pressure guiding pipes picking out from venturi upstream pressure sensor location and downstream pressure sensor location are coupled with the 3rd differential pressure transmitter, and the differential pressure of three differential pressure transmitter measurements is respectively front differential pressure, rear differential pressure with total crushing.This utility model has self diagnosis redundancy feature.

Description

Double ratio method dampness liquid phase content measurement apparatus
Technical field
This utility model belongs to dampness gas-liquid two-phase flow measurement technology field, is related to a kind of civilian based on three differential pressure long throats The measurement apparatus of dampness liquid phase content in mound and measuring method.
Background technology
Defined in ISO TR 11583 technical report in 2012, " it is visual that gaseous phase volume contains the biphase gas and liquid flow that rate is more than 95% For dampness ".Dampness is widely present in nature and industrial process, such as the neck such as oil, chemical industry, metallurgy, nuclear energy, Aero-Space Domain, mainly comprises two big class, one be wet saturated steam, its two be wet gas.In recent decades, with traditional industry with newly The fast development of emerging industry, people propose higher and higher requirement to the Metering in dampness two phase flow.But it is existing Achievement in research show, due to dampness flowing complexity and multiformity, the accurate measurement of gas-liquid two-phase flow to be realized, especially It is that the measurement of liquid phase content also has very big difficulty.The means of the liquid phase content commonly used at present are technology based on separator, Tracer technique and ray technology.Volume both bulk, cost height, management are had based on the liquid phase measuring technology of separator and runs The shortcoming of high cost;Tracer technique needs in pipeline online perforate sampling, using the reacting condition liquid of upstream and downstream tracer concentration Phase content, often has problems in terms of safety and sample representation;Then there is safety management in use in ray technology The strict demand of aspect, popularization and application difficulty is big.
Chinese patent CN 103048019A proposes a kind of " double difference pressure flux of moisture measurement based on long throat venturi Device ".This device, by carrying out pressure using composite integrated annular chamber gas-liquid separation pressure, realizes the quickly effective of gas-liquid Isolation, the signal to noise ratio reducing measurement signal is low.It was verified that this design yet suffers from following shortcoming:(1) ring casing pressure vessel pair The pressure signal ability of equalization of upstream and throat is preferable, and the ring casing pressure signal at the pressure sensor location of downstream has unstability, Analyze its reason, due in working condition west, such as under conditions of different pressures, gas phase flow velocity and liquid holdup, at the pressure of downstream with Venturi is expanded the distance between pipeline section outlet and is defined to 5-9 times of internal diameter of the pipeline, actually in this in the distance, the stablizing of signal Property can not be effectively ensured;(2) press the moisture measuring device of technology based on double difference, when any one transmitter breaks down, no Self-diagnostic function, directly results in mistake in computation.
Utility model content
The purpose of this utility model is the problems referred to above overcoming prior art, improves the structure design of original measurement apparatus, Optimize downstream pressure sensor location, become double difference pressure and be measured as three differential pressure measurements, a kind of dampness liquid phase content measurement apparatus, this practicality are provided New adopt the following technical scheme that:
A kind of pair of ratio method dampness liquid phase content measurement apparatus, including long throat Venturi meter road it is characterised in that Three differential pressure transmitters of setting:First differential pressure transmitter and the second differential pressure transmitter and the 3rd differential pressure transmitter, in long throat literary composition Measure in mound and respectively arrange at a pressure at upstream, throat's middle and lower reaches position and the downstream of pipeline, from upstream and throat's middle and lower reaches The two external pressure guiding pipes picking out at the pressure of position two are coupled with the first differential pressure transmitter, from the position pressure of throat's middle and lower reaches The two external pressure guiding pipes picking out at the pressure of downstream straight length behind place and expansion segment outlet are coupled with the second differential pressure transmitter; The two external pressure guiding pipes picking out from venturi upstream pressure sensor location and downstream pressure sensor location are coupled with the 3rd differential pressure transmitter, The differential pressure of three differential pressure transmitter measurements is respectively front differential pressure, rear differential pressure with total crushing.
Expand 5-15 times that the distance between pipeline section outlet should be internal diameter of the pipeline with venturi at the pressure of downstream.
Double ratio method dampness liquid phase content measurement apparatus that this utility model is given have following beneficial effect:First, Need not separate, be independent of radiological techniques and tracer technique and dampness liquid phase content is measured, structure is simple, safety;Second, Using measurement apparatus of the present utility model, then it is aided with corresponding software, it is possible to use venturi double difference pressure ratio value information is simultaneously straight Connect the liquid phase content in measurement dampness, differential pressure high precision, the accuracy containing rate measurement is good, can achieve from verification and calibration.
Brief description
The double ratio method dampness liquid phase content measurement apparatus system diagram of Fig. 1
Brief description is as follows:1 pressure transmitter, 2-1 the first differential pressure transmitter 2-2 the second differential pressure transmitter, 2-3 the 3rd Differential pressure transmitter 4 temperature transmitter, 5 valve groups, 6 ring casing pressure vessels, 7 pressure guiding pipes-access pressure device, 8 impulse valves, 9 blowoff valves, 10-1 upstream pressure sensor location, 10-2 throat pressure sensor location, 10-3 downstream pressure sensor location, 11 measurement pipelines, 12 pressure port 13 dampness Liquid phase content calculating instrument
Fig. 2 tri- differential pressure schematic diagram
Fig. 3, double ratio DPR/PLR and liquid phase volume contain the relation of rate LVF.
Specific embodiment
With reference to the accompanying drawings this utility model is further described.
This utility model, based on three differential pressure technology long throat Venturis, constitutes " double ratios using three differential pressure information Liquid phase content in value " method direct measurement dampness.Specific embodiment is as follows:
Three differential pressure transmitters the upstream of long throat venturi, throat, downstream difference pressure, share three ring casing gas Liquid isolates pressure vessel.Equipped with pressure transmitter at upstream entrance, the pressure guiding pipe of this transmitter can be upper by the first differential pressure transmitter Trip pressure guiding pipe bypass is drawn, with front differential pressure and total crushing in upstream impulse end one annular chamber gas-liquid separation pressure totally;Front differential pressure Share an annular chamber gas-liquid separation pressure with rear differential pressure in throat;Differential pressure shares a ring at the downstream impulse end of total crushing afterwards Room gas-liquid isolation pressure vessel.Temperature transmitter is fixed on device most downstream, for measuring the temperature in pipeline.
As shown in figure 1, measurement pipeline of the present utility model is Venturi meter road, the upstream 10-1 of measurement pipeline, larynx At portion 10-2 and downstream, 10-3 arranges three pressure points, and this utility model device distinguishes pressure in upstream 10-1 and throat 10-2, It is connected on the first differential pressure transmitter 2-1, in downstream 10-3 and throat 10-2 pressure respectively, be connected to the second differential pressure transmitter 2- On 2, in upstream 10-1 and downstream 10-3 pressure respectively, it is connected on the 3rd differential pressure transmitter 2-3, each pressure point is fixed on one In the pressure room 5 of individual ring casing structure.Afterwards differential pressure using the pressure sensor location on the straight length of downstream as high side pressure, throat's pressure sensor location As low side pressure, the distance between the pressure of high side pressure and expansion pipeline section outlet are 5~15 times of internal diameter of the pipeline, and throat takes Pressure position is located at the middle and lower reaches of throat.Different according to range ability demand, throat length is and Chinese patent [CN103048019A] is identical.The expansion angle of expansion segment is 3~6 °;Throttling ratio is between 0.35~0.7.Venturi is upper and lower Annular chamber gas-liquid separation pressure at trip pressure sensor location is similar with the structure of throat, and each ring casing all designs two external drawing Pressure device, this is not connected to first, second, third differential pressure transmitter.
As shown in Fig. 2 three differential pressures are respectively the front differential pressure Δ P that venturi upstream is formed with throatF, throat and downstream formed Rear differential pressure Δ PBAnd the total crushing Δ P being formed between upstream and downstreamLoss.The ratio of forward and backward differential pressure is DPR (Differential Pressure Ratio), total crushing is PLR (Pressure Loss Ratio) with the ratio of front differential pressure. As shown in figure 3, in figure transverse axis is the percentage ratio (between 0~5%) of liquid phase content, it is DPR on the left of the longitudinal axis, right side is PLR.Then, The method that double ratio methods measure dampness liquid phase contents is:
Because the relation of DPR and liquid phase content is to have monotone variation rule, available DPR measures liquid phase content, intrinsic under Formula:
LVF (%)=Ψ (Δ PF/ΔPB)=Ψ (DPR)
PLR and liquid phase content equally have monotone variation rule, and simply the amplitude of ratio is different, therefore equally available PLR realizes the effective verification to liquid phase content and calibration, has
LVF (%)=Φ (Δ PLoss/ΔPF)=Φ (PLR)
Wherein, Ψ and Φ is the polynomial fit function respectively with regard to two ratios and liquid phase content.

Claims (2)

1. a kind of pair of ratio method dampness liquid phase content measurement apparatus, including long throat Venturi meter road it is characterised in that setting Put three differential pressure transmitters:First differential pressure transmitter and the second differential pressure transmitter and the 3rd differential pressure transmitter, on long throat literary composition mound In measure and respectively arrange at a pressure at the upstream of pipeline, throat's middle and lower reaches position and downstream, from upstream and throat's middle and lower reaches position Put the external pressure guiding pipe of two picking out at two pressures and be coupled with the first differential pressure transmitter, at the position pressure of throat's middle and lower reaches It is coupled with the second differential pressure transmitter with the two external pressure guiding pipes picking out at the pressure of downstream straight length after expansion segment outlet;From Two external pressure guiding pipes that venturi upstream pressure sensor location and downstream pressure sensor location pick out are coupled with the 3rd differential pressure transmitter, and three The differential pressure of individual differential pressure transmitter measurement is respectively front differential pressure, rear differential pressure with total crushing.
2. according to claim 1 pair of ratio method dampness liquid phase content measurement apparatus it is characterised in that at the pressure of downstream with Venturi expands 5-15 times that the distance between pipeline section outlet is internal diameter of the pipeline.
CN201620799635.7U 2016-07-23 2016-07-23 Double ratio method dampness liquid phase content measurement apparatus Expired - Fee Related CN205991821U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620799635.7U CN205991821U (en) 2016-07-23 2016-07-23 Double ratio method dampness liquid phase content measurement apparatus

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Application Number Priority Date Filing Date Title
CN201620799635.7U CN205991821U (en) 2016-07-23 2016-07-23 Double ratio method dampness liquid phase content measurement apparatus

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CN205991821U true CN205991821U (en) 2017-03-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108844673A (en) * 2018-06-27 2018-11-20 天津浩天自动化仪表制造有限公司 A kind of rectification type Venturi tube pressure difference measuring device
CN109870201A (en) * 2019-02-23 2019-06-11 天津大学 A kind of separable ring mist flow separate phase flow rate measurement method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108844673A (en) * 2018-06-27 2018-11-20 天津浩天自动化仪表制造有限公司 A kind of rectification type Venturi tube pressure difference measuring device
CN109870201A (en) * 2019-02-23 2019-06-11 天津大学 A kind of separable ring mist flow separate phase flow rate measurement method
CN109870201B (en) * 2019-02-23 2020-07-24 天津大学 Combined annular atomized flow phase flow measurement method

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20170301

Termination date: 20200723

CF01 Termination of patent right due to non-payment of annual fee