CN202974350U - Air supply flow real-time detection device for rectangular section pipeline - Google Patents

Air supply flow real-time detection device for rectangular section pipeline Download PDF

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Publication number
CN202974350U
CN202974350U CN 201220505328 CN201220505328U CN202974350U CN 202974350 U CN202974350 U CN 202974350U CN 201220505328 CN201220505328 CN 201220505328 CN 201220505328 U CN201220505328 U CN 201220505328U CN 202974350 U CN202974350 U CN 202974350U
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CN
China
Prior art keywords
pipeline
cone
flow rate
time detection
rectangular
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Expired - Fee Related
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CN 201220505328
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Chinese (zh)
Inventor
段泉圣
马佳伟
杨国田
赵庆
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North China Electric Power University
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North China Electric Power University
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Priority to CN 201220505328 priority Critical patent/CN202974350U/en
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Abstract

The utility model discloses an air supply flow real-time detection device for a rectangular section pipeline, which belongs to the field of process parameter detection. The real-time detection device comprises a measurement pipe section, a sensor assembly, a micro-differential pressure transmitter, an I/V (Current/Voltage) converter, an A/D (Analog to Digital) converter, a temperature transmitter, a pressure transmitter, a programmable control sampling switch and a microcomputer signal processing system; and the measurement pipe section is in sealing connection with an air supply pipeline by flanges on the upstream and downstream sides. According to the utility model, m inner cores with the completely same structure size are arranged on the cross section of the rectangular section pipeline at the measurement pipe section; the sensor assembly consisting of the cross section of the pipeline is subjected to divided measurement; a flow-rate-area flow measurement scheme adopting a multi-point inner core method is designed; the defect that the inner core method is generally suitable for a round section pipeline is overcome; and the advantages of the inner core method are sufficiently played. By practice, a high-effectiveness and high-robustness solution is provided for detecting the air supply flow of a power generating boiler.

Description

A kind of rectangular-section pipeline air flow rate real-time detection apparatus
Technical field
The utility model belongs to technical field of process parameter detection, particularly a kind of rectangular-section pipeline air flow rate real-time detection apparatus.
Background technology
Will make safe operation of the boiler in the fuel-burning power plant under optimum condition, its air and flue system is regulated, pulverized coal preparation system is regulated, combustion system is regulated all needs the air flow rate signal that reliability is high and validity is high.due to large-scale electricity generation boiler once, the secondary blast pipeline is all that equivalent diameter is greater than the rectangular duct of 2000mm, and the pressure loss that allows is less, need not to demarcate separately so can't adopt the standard restriction device that has again simultaneously than the high measurement accuracy in engineering, and have to adopt the even speed tube air velocity transducer based on the dynamic pressure method (to comprise Verabar (Verabar), Verabar (Wellbar), Delta bar (Deltaflow), A Niuba (Annubar), Tuo Ba (Torbar) etc.), measuring air flow rate measures the total head of fluid and the difference of static pressure, namely characterize wind speed with so-called " dynamic pressure ", and then obtain air flow rate by velocity-area method.Because flow area is large, velocity flow profile is inhomogeneous, engineering practice shows, the validity that now widely used aerofoil profile dynamic pressure tube method is measured air flow rate can't be guaranteed, and therefore adopts the rectangular-section pipeline air flow rate measuring method based on the dynamic pressure method of average to comprise that the aerofoil profile dynamic pressure tube still has limitation.
The utility model content
The utility model purpose is for prior art being applied to the low poor present situation of validity that reaches of robustness in the measurement of boiler of power plant air flow rate, a kind of rectangular-section pipeline air flow rate real-time detection apparatus is proposed, it is characterized in that, this rectangular-section pipeline air flow rate real-time measurement apparatus is a kind of boiler air flow rate real-time detection apparatus based on multiple spot inner cone method; This device forms by measuring pipeline section, temperature transmitter, pressure unit, sensor module, differential pressure transmitter, A/D converter, I/V converter, control sampling switch able to programme and microcomputer signal processing system; Air flow rate is measured pipeline section 1 by upstream side flange 4, downstream flange 5 is connected with air supply duct 6 sealings, arrange m structure and the identical inner cone 2 of size over against incoming flow on the xsect of the interior measurement pipeline section of air flow rate measurement pipeline section 1, m inner cone is fixed on the diverse location formation sensor module of same cross-section of pipeline; Connect with being fixedly connected with fin 3 between the wall of adjacent two inner cones 2 and inner cone and measurement pipeline section 1, be fixed on and measure in pipeline section 1; The impulse signal pipeline 7 of each inner cone passes tested pipeline 1, access respectively the positive/negative-pressure chamber of the differential pressure transmitter that is complementary with each inner cone, wherein m inner cone joined m differential pressure transmitter, and differential pressure transmitter is connected with I/V converter, A/D converter, control sampling switch able to programme and microcomputer signal processing system again.4 ~ 20mA current output signal of every differential pressure transmitter is delivered to the microcomputer signal processing system through I/V converter, A/D converter, control sampling switch able to programme again; Also be respectively equipped with pressure tappings and pressure unit joins, temperature sensor and temperature transmitter join in tested pipeline, 4 ~ 20mA DC output signal of pressure unit and temperature transmitter is delivered to the microcomputer signal processing system through I/V converter, A/D converter, control sampling switch able to programme.
Described m is the positive integer more than or equal to 3,
The meeting of every inner cone of a described m inner cone flows into actinal surface all on the cross section of measuring pipeline section, and m inner cone will be measured cross section m decile.
It is identical that wall 8 interior side-wall surface 9 and the Venturi nozzle on two long limits of described measurement pipeline section 1 xsect prolongs axial longitudinal profile shape.
The beneficial effects of the utility model are:
1. the employing inner cone, increase substantially measurement sensitivity;
2. every inner cone all is furnished with, one to one differential pressure transmitter supporting with it, and each sub-cross section flow velocity is measured, and makes the validity of flow measurement compare traditional air flow rate measuring method with robustness and is significantly improved.
3. two parallel wall surfaces of measuring pipeline section adopt Venturi nozzle buttock line outline-shaped to shrink cylinder, produce throttling action, under the very little prerequisite of the pressure loss, the Reynolds number of measuring fluid on the cross section is increased, effectively eliminate the inhomogeneous error that causes flow measurement of velocity flow profile that low flow velocity causes, improve and measure sensitivity;
4. make air velocity transducer differential pressure output corresponding under identical flow velocity far away higher than wing dynamic pressure tube method, and the validity of measurement result is significantly improved.
Description of drawings
Fig. 1 is that the air flow rate measurement mechanism is measured pipeline section vertical profile (long limit L is parallel with the square-section) face (section is parallel with wind speed) schematic diagram (B-B section).
Fig. 2 is that the air flow rate measurement mechanism is measured pipeline section cross-sectional (minor face W is parallel with the square-section) face (section is parallel with wind speed) schematic diagram (A-A section).
Fig. 3 is air flow rate measuring system principle of compositionality figure.
Embodiment
It is a kind of for power plant's square-section air supply duct air flow rate real-time detection apparatus that the utility model provides, compared with prior art, even this device also has higher sensitivity and larger output differential pressure signal when low flow velocity, and the validity of flow measurement obviously improves, and the utility model is described in further detail below in conjunction with accompanying drawing and best case study on implementation.
If the transversal face length length of side of rectangle air supply duct is L, minor face is long is W.
In Fig. 1,2, air flow rate is measured pipeline section 1 by upstream side flange 4, and downstream flange 5 is realized being tightly connected with air supply duct 6, on the xsect in measuring pipeline section 1 over against incoming flow υ 0Arrange m the identical inner cone 2 of physical dimension on direction, m is the positive integer more than or equal to 3, and the xsect of minute measuring channel such as m inner cone forms sensor module; Be connected with being fixedly connected with fin 3 between adjacent two inner cones 2 and inner cone 2 and the wall of measuring pipeline section 1, be fixed in measurement pipeline section 1; Two inner cones at described sensor module two ends are close to the minor face wall of measuring channel and are installed; It is identical that wall 8 interior side-wall surface 9 and the Venturi nozzle of measuring two long limits of pipeline section 1 xsect prolongs axial longitudinal profile shape.The pressure guiding pipe 7 of described inner cone passes tested pipeline, and accessing respectively i is the positive/negative-pressure chamber of each differential pressure transmitter of 1 ~ d, and wherein d is 1,2,3 ... .. positive integer (as shown in Figure 3); Differential pressure transmitter is connected with I/V converter, A/D converter, control sampling switch able to programme and microcomputer signal processing system again.Output 4 ~ 20mA DC current signal of differential pressure transmitter is delivered to the microcomputer signal processing system through I/V converter, A/D converter, control sampling switch able to programme; The temperature of detected fluid, pressure convert 4 ~ 20mA DC current signal to by temperature transmitter, pressure unit respectively, then are delivered to the microcomputer signal processing system by I/V converter, A/D converter, control sampling switch able to programme separately.
Described air flow rate pick-up unit principle of work is as follows:
This air flow rate measuring method adopts speed-area-method, arranges altogether m(m 〉=3 in measuring channel) inner cone, the rectangular duct xsect intangibly is divided into m sub-cross section, measure the flow velocity υ of the individual measuring point of m (m 〉=3) on the cross section iArithmetic mean as the mean flow rate on this cross section , under operating condition (pressure p, temperature t), air supply duct air-supply volumetric flow rate q vFor:
q vi = v i s i (1)
q v = Σ i = 1 m q vi = 1 m ( υ 1 + υ 2 + . . . + υ m ) s = υ ‾ s - - - ( 2 ) (2)
S is the equivalent area that air supply duct is measured the cross section.
I inner cone output differential pressure Δ p iWith loca wind speed v iRelations Among
v i = β i 2 1 - β i 4 C i ϵ 2 ρ Δp i - - - ( 3 ) ?(3)
(3) β in formula iBe i inner cone throttling than coefficient, C iBe efflux coefficient, ε is inflatable coefficient, and ρ is detected fluid density under operating condition, β i, C i, ε, ρ be constant, the differential pressure transmitter that matches with i inner cone is with Δ p iBe converted into 4 ~ 20mA DC electric current, be delivered to Single Chip Microcomputer (SCM) system through I/V, A/D, control sampling switch able to programme, calculate operating condition by (2) formula, be i.e. temperature t, volumetric flow rate q during pressure P v
Rectangular-section pipeline air flow rate detection system principle of compositionality as shown in Figure 3, temperature transmitter in measuring channel and pressure unit are measured fluid temperature (F.T.) t and pressure p respectively, the current signal of output becomes 1-5V dc voltage signal through the I/V converter, be converted to again the digital signal of response through A/D converter, deliver to computer system through control sampling switch able to programme, computer system transforms into air-supply volume flow Q under the status of criterion according to equation of gaseous state with air flow rate q u:
(4), P dBe normal atmospheric pressure, generally get P d=101325P a
(4) in formula, q represents that pressure is p(relative pressure, i.e. gauge pressure), working temperature is t(℃) time air flow rate; Q 0Be P under the expression status of criterion 0=0.1MPa(absolute pressure), T 0Boiler air-supply standard volume flow during=293.15K.
The utility model adopts on the xsect of the rectangular-section pipeline of measuring pipeline section, over against incoming flow υ 0Arrange m the identical inner cone of physical dimension on direction, the xsect of minute measuring channel such as m inner cone, form sensor module, designed the flow velocity of multiple spot inner cone method-area flow measurement scheme, the wind speed that differential pressure before and after inner cone characterizes is used as a flow velocity use, overcome the deficiency that the inner cone method is applicable to the round section pipeline usually, given full play to the advantage of inner cone method.

Claims (5)

1. a rectangular-section pipeline air flow rate real-time detection apparatus, is characterized in that, this a kind of rectangular-section pipeline air flow rate real-time detection apparatus is a kind of boiler air flow rate real-time detection apparatus based on multiple spot inner cone method, this real-time detection apparatus is by measuring pipeline section, sensor module, differential pressure transmitter, the I/V converter, A/D converter, temperature transmitter, pressure unit, control sampling switch able to programme and microcomputer signal processing system consist of, it is characterized in that: air flow rate is measured pipeline section (1) and is tightly connected with air supply duct (6) by upstream side flange (4) and downstream flange (5), in measuring pipeline section (1), measure on pipeline section (1) xsect and arrange m the identical inner cone of physical dimension (2) on the direction of incoming flow, m inner cone (2) consists of sensor module, adjacent two inner cones (2) and inner cone (2) are connected with being fixedly connected with fin (3) with measuring between pipeline section (1) wall, are fixed in measurement pipeline section (1), the pressure guiding pipe of each inner cone (7) passes tested pipeline, access respectively the differential pressure transmitter positive/negative-pressure chamber that matches, every inner cone is equipped with a differential pressure transmitter, m inner cone joined m differential pressure transmitter altogether, and differential pressure transmitter is connected with I/V converter, A/D converter, control sampling switch able to programme and microcomputer signal processing system again.
2. a kind of rectangular-section pipeline air flow rate real-time detection apparatus according to claim 1 is characterized in that: described m is for more than or equal to 3 positive integer.
3. a kind of rectangular-section pipeline air flow rate real-time detection apparatus according to claim 1 is characterized in that: the meeting of every inner cone of a described m inner cone flows into actinal surface all on the same xsect of measuring pipeline section, and m inner cone will be measured cross section m decile.
4. a kind of rectangular-section pipeline air flow rate real-time detection apparatus according to claim 1 is characterized in that: two inner cones at described sensor module two ends are close to the minor face wall of measuring channel and are installed.
5. a kind of rectangular-section pipeline air flow rate real-time detection apparatus according to claim 1, it is characterized in that, it is identical that wall (8) interior side-wall surface (9) on two long limits of described measurement pipeline section (1) xsect and Venturi nozzle prolong axial longitudinal profile shape.
CN 201220505328 2012-09-28 2012-09-28 Air supply flow real-time detection device for rectangular section pipeline Expired - Fee Related CN202974350U (en)

Priority Applications (1)

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CN 201220505328 CN202974350U (en) 2012-09-28 2012-09-28 Air supply flow real-time detection device for rectangular section pipeline

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997967A (en) * 2012-09-28 2013-03-27 华北电力大学 Blowing flow real time measuring device and method for pipeline with rectangular section
CN104457862A (en) * 2014-11-28 2015-03-25 力合科技(湖南)股份有限公司 Differential pressure flowmeter
CN106814133A (en) * 2015-12-01 2017-06-09 中国科学院大连化学物理研究所 A kind of acoustic array method of embedded type chimneying homogeneity of fault plane detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997967A (en) * 2012-09-28 2013-03-27 华北电力大学 Blowing flow real time measuring device and method for pipeline with rectangular section
CN104457862A (en) * 2014-11-28 2015-03-25 力合科技(湖南)股份有限公司 Differential pressure flowmeter
CN106814133A (en) * 2015-12-01 2017-06-09 中国科学院大连化学物理研究所 A kind of acoustic array method of embedded type chimneying homogeneity of fault plane detection
CN106814133B (en) * 2015-12-01 2020-01-03 中国科学院大连化学物理研究所 Audio array method for detecting uniformity of airflow section of embedded pipeline

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

Granted publication date: 20130605

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