CN101672683B - Method for online calibrating perforated plate-type steam flow measurement system - Google Patents

Method for online calibrating perforated plate-type steam flow measurement system Download PDF

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Publication number
CN101672683B
CN101672683B CN200910102808XA CN200910102808A CN101672683B CN 101672683 B CN101672683 B CN 101672683B CN 200910102808X A CN200910102808X A CN 200910102808XA CN 200910102808 A CN200910102808 A CN 200910102808A CN 101672683 B CN101672683 B CN 101672683B
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pressure
steam flow
flow measurement
value
calibration
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CN101672683A (en
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张国洪
蒋友刚
范吉昌
杨灏
王小力
马云
守成明
姚纯
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GUIZHOU PROVINCE INSTITUTE OF MEASUREMENT
China Tobacco Guizhou Industrial Co Ltd
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GUIZHOU PROVINCE INSTITUTE OF MEASUREMENT
China Tobacco Guizhou Industrial Co Ltd
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Abstract

The invention discloses a method for online calibrating perforated plate-type steam flow measurement system, comprising the following steps: equalizing the pressure at the high pressure end and the low pressure end of the perforated plate-type steam flow measurement system, closing a high-pressure end valve and a low-pressure end valve on a balance valve, subsequently draining sewage; connecting a high-pressure soft pipe of the online calibrating device of the perforated plate-type steam flow measurement system and a high-pressure sewage-drainage outlet of the high-pressure sewage-drainage pipe of the steam flow measurement system, connecting a low-pressure soft pipe with a low-pressure sewage-drainage outlet of the low-pressure sewage-drainage pipe of the steam flow measurement system, connecting a pressure connecting soft pipe with a pressure sewage-drainage outlet of the pressure sewage-drainage pipe of the steam flow measurement system; and opening exhaust ports on a differential pressure transmitter used for calibration after filling the condensed water in each sewage-drainage pipe, draining water of the exhaust ports of the differential pressure transmitter used for calibration, subsequently leading the balance valve to recover to the working state, waiting the system for stabilization and subsequently reading the differential pressure value, the pressure value, the display flow value, calculating the practical flow value and correcting the display flow value according to the practical flow value. The method can realize online calibration of the steam flow measurement system, improve the production efficiency and reduce the equipment investment cost.

Description

The on-line calibration method of perforated plate-type steam flow measurement system
Technical field
The present invention relates to the collimation technique field of Flow Measuring System, relate in particular to a kind of calibration steps of steam flow measurement system.
Background technology
Perforated plate-type steam flow measurement system claims differential pressure flowmeter again, and system is made up of orifice plate, connecting pipe, differential pressure transmitter, pressure unit, integrating instrument and display.System promptly draws each parameter value on classical flow equation the right by measuring respectively, calculate and tabling look-up by the measurement of indirect metering system realization steam flow, carries it into classical flow equation then, calculates the flow of being surveyed, and is shown by display.Since being born from perforated plate-type steam flow measurement system so far, become present utilization the most extensive, install quantity at most, utilization steam flow measurement system with the longest history, it is extensive use of in all conglomeraties such as tobacco, electric power, metallurgy, chemical industry.
Mainly there is following problem in existing perforated plate-type steam flow measurement system: (1) need be made regular check on orifice plate and safeguard (because the orifice plate dismounting comparatively bothers, usually enterprise all is to use the several years just once to check maintenance, and this makes it become one of the measurement result accuracy factor that influences); (2) system in order to eliminate measuring error, needs respectively differential pressure transmitter, pressure unit and integrating instrument to be unloaded from system after using certain hour, send laboratory (need send relevant testing agency to the enterprise that does not have detection capability) to calibrate.Above factor all need be shut down operation, thereby has influenced production efficiency, has increased production cost.In order to make the perforated plate-type steam flow measurement system device therefor between alignment epoch, do not influence normal production, producer is toward living to need the configuration spare part, wherein pressure unit needs thousands of units, differential pressure transmitter to need thousand yuan of 3-4, a cigar mill that produces 1000000 casees per year just need be equipped with nearly hundred of differential pressure transmitter and pressure units, has increased its cost of investment undoubtedly.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming and a kind of on-line calibration that can realize the vapor flow rate measuring system is provided, has improved production efficiency, reduced the on-line calibration method of the perforated plate-type steam flow measurement system of equipment investment cost.
The on-line calibration method of a kind of perforated plate-type steam flow measurement system of the present invention may further comprise the steps:
(1) compensation flap on the equalizing valve of perforated plate-type steam flow measurement system is opened, made height pressure side equipressure;
(2) close high-pressure side valve and low pressure end valve on the equalizing valve, open pressure sewage draining valve, high pressure sewage draining valve and the blowdown of low pressure sewage draining valve respectively, after blowdown finishes, close above-mentioned three valves;
(3) the differential pressure calibration module is made of with differential pressure transmitter, process checking gauge A high-pressure hose, low-pressure hose, calibration, high-pressure hose one end is connected with the high pressure feed of calibration with differential pressure transmitter, low-pressure hose one end is connected with the low pressure input port of calibration with differential pressure transmitter, and calibration is connected with process checking gauge A with the delivery outlet of differential pressure transmitter; The pressure calibration module connects flexible pipe, modular pressure, process checking gauge B by pressure and constitutes, and pressure connects flexible pipe one end and is connected with the input end of modular pressure, and the output terminal of modular pressure is connected with process checking gauge B; With high-pressure hose be connected with the high pressure sewage draining exit of the high pressure blow-off pipe of steam flow measurement system, low-pressure hose is connected with the low pressure sewage draining exit of the low pressure blow-off pipe of steam flow measurement system, pressure connects the pressure sewage draining exit that flexible pipe connects the pressure blow-off pipe of steam flow measurement system;
(4) treat to be full of condensate water in each blow-off pipe after, Exhaust Open on the mutatis mutandis differential pressure transmitter of high-ranking officers, open high pressure sewage draining valve and the exhaust of low pressure sewage draining valve then simultaneously, make calibration with after the exhausr port drainage water of differential pressure transmitter, close the exhausr port of calibration with differential pressure transmitter, compensation flap on the equalizing valve valve body is closed, make equalizing valve return to duty, just can measure after waiting for about 30mi n system stability;
(5) read differential pressure value Δ P, pressure value P respectively at process checking gauge A, process checking gauge B, read the demonstration flow value of perforated plate-type steam flow measurement system simultaneously synchronously; By Density value, the detected differential pressure value of Δ P-of K-experience factor in the formula, ρ-find according to detected force value, calculate the actual flow value of perforated plate-type steam flow measurement system, in view of the above the demonstration flow value of perforated plate-type steam flow measurement system is revised.
The on-line calibration method of above-mentioned perforated plate-type steam flow measurement system, wherein: process checking gauge A, process checking gauge B read differential pressure value, force value respectively, read simultaneously the demonstration flow value of perforated plate-type steam flow measurement system synchronously, the time of reading is 5-30min, during this period can be to read 30 data or more data arbitrarily at interval, calculate mean value separately respectively, go out the flow value of calibration equipment and the flow value of perforated plate-type steam flow measurement system with mean value calculation.
The present invention compared with prior art, have the produce effects fruit is significantly arranged, by above technical scheme as can be known, procedure inspection instrument A shows that differential pressure value Δ P, the procedure inspection instrument B of differential pressure transmitter input show the pressure value P of modular pressure input, and the dynamic of these two parameters directly measured and calculated flow value and show that flow compares with institute's measured value.Instrument and equipment with maturation combines a kind of pick-up unit that detects perforated plate-type steam flow measurement system.Solve the accurate measuring problem of steam flow in the energy-saving and cost-reducing work, onlinely directly steam flow measurement system has been calibrated, improved the accuracy of the steam flow of measuring, realized the online in real time calibration; Online dynamic calibration does not simultaneously influence production, has removed to examining the indispensable fund that spare part overstock of standard; This apparatus structure is simple, price is lower, has good application and promotion prospect; Data are directly perceived, and calibration is quick, simple.Can be widely used in the detection system (promptly can be applicable to the differential pressure of boiler shop and the on-line calibration of pressure and Displaying Meter) of differential pressure mode sensed water level and discharge, pressure.
Description of drawings
Accompanying drawing is the principle schematic of this calibration steps.
Embodiment
Embodiment 1
With raw silk workshop section of calibration Guiyang Tobacco Factory steam flow check point is example:
The on-line calibration method of perforated plate-type steam flow measurement system may further comprise the steps:
(1) compensation flap on the equalizing valve of perforated plate-type steam flow measurement system is opened, made height pressure side equipressure;
(2) close high-pressure side valve and low pressure end valve on the equalizing valve, open pressure sewage draining valve, high pressure sewage draining valve and the blowdown of low pressure sewage draining valve respectively, after blowdown finishes, close above-mentioned three valves;
(3) the differential pressure calibration module is made of with differential pressure transmitter, process checking gauge A high-pressure hose, low-pressure hose, calibration, high-pressure hose one end is connected with the high pressure feed of calibration with differential pressure transmitter, low-pressure hose one end is connected with the low pressure input port of calibration with differential pressure transmitter, and calibration is connected with process checking gauge A with the delivery outlet of differential pressure transmitter; The pressure calibration module connects flexible pipe, modular pressure, process checking gauge B by pressure and constitutes, and pressure connects flexible pipe one end and is connected with the input end of modular pressure, and the output terminal of modular pressure is connected with process checking gauge B; With high-pressure hose be connected with the high pressure sewage draining exit of the high pressure blow-off pipe of steam flow measurement system, low-pressure hose is connected with the low pressure sewage draining exit of the low pressure blow-off pipe of steam flow measurement system, pressure connects the pressure sewage draining exit that flexible pipe connects the pressure blow-off pipe of steam flow measurement system;
(4) treat to be full of condensate water in each blow-off pipe after, Exhaust Open on the mutatis mutandis differential pressure transmitter of high-ranking officers, open high pressure sewage draining valve and the exhaust of low pressure sewage draining valve then simultaneously, make calibration with after the exhausr port drainage water of differential pressure transmitter, close the exhausr port of calibration with differential pressure transmitter, compensation flap on the equalizing valve valve body is closed, make equalizing valve return to duty, just can measure after waiting for about 30mi n system stability;
(5) read differential pressure value, force value respectively at process checking gauge A, process checking gauge B, read the demonstration flow value of perforated plate-type steam flow measurement system simultaneously synchronously; The time of reading is 5-30min, can calculate mean value separately respectively to read 30 data or more data at interval arbitrarily during this period, goes out the flow value of calibration equipment and the flow value of perforated plate-type steam flow measurement system with mean value calculation, by Calculate the flow of perforated plate-type steam flow measurement system and the deviation of design discharge.
Classical flow equation is as follows:
Q = c 1 - β 4 ϵ A 0 2 ρΔP
Develop outflow according to classical flow equation and calculate experimental formula:
Q = k ρΔP
According to designing unit " calculated description ", check in: k=0.4056937.
Detect data such as following table (the unit difference in the form, it is different with the working range of differential pressure to characterize pressure):
Looking into the saturated vapor density table gets:
When absolute pressure was 1.174641MPa, saturated vapor density was 6.003;
When absolute pressure was 1.201020MPa, saturated vapor density was 6.132.
By interpolation arithmetic, in the time of can getting relative pressure 1.108MPa, when absolute pressure was 1.1974MPa, saturated vapor density was: 6.114.
With differential pressure 1.797kpa, density 6.114, k=0.405693 revises original system according to the result for as shown in the formula the flow value that can draw detection.
Q = k ρΔP = 1.345 t / h
Embodiment 2
With raw silk workshop section of calibration Guiyang Tobacco Factory steam flow check point is example.
The on-line calibration method of perforated plate-type steam flow measurement system is with embodiment 1.
According to designing unit " calculated description ", check in: k=0.4056937.
Detect data such as following table (the unit difference in the form, it is different with the working range of differential pressure to characterize pressure):
Looking into the saturated vapor density table gets:
When absolute pressure was 1.201020MPa, saturated vapor density was 6.132;
When absolute pressure was 1.227891MPa, saturated vapor density was 6.264.
By interpolation arithmetic, can get relative pressure 1.121MPa, when absolute pressure was 1.2104MPa, saturated vapor density was: 6.178.
With differential pressure 1.816kpa, density 6.178, k=0.4056937 revises original system according to the result for as shown in the formula the flow value that can draw detection.
Q = k ρΔP = 1.359 t / h
Embodiment 3
With fermentation workshop section of calibration Guiyang Tobacco Factory steam flow check point is example:
The on-line calibration method of perforated plate-type steam flow measurement system is with embodiment 1.
According to designing unit " calculated description ", check in: k=0.4918.
Detect data such as following table (the unit difference in the form, it is different with the working range of differential pressure to characterize pressure):
Looking into the saturated vapor density table gets:
When absolute pressure was 0.5021MPa, saturated vapor density was 2.679;
When absolute pressure was 0.515535MPa, saturated vapor density was 2.747.
By interpolation arithmetic, can get relative pressure 0.423MPa, when absolute pressure was 0.5124MPa, saturated vapor density was: 2.7311.
With differential pressure 0.571kpa, density 2.7311, k=0.4918 revises original system according to the result for as shown in the formula the flow value that can draw detection.
Q = k ρΔP = 0.614 t / h
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.

Claims (2)

1. the on-line calibration method of a perforated plate-type steam flow measurement system may further comprise the steps:
(1) compensation flap on the equalizing valve of perforated plate-type steam flow measurement system is opened, made height pressure side equipressure;
(2) close high-pressure side valve and low pressure end valve on the equalizing valve, open pressure sewage draining valve, high pressure sewage draining valve and the blowdown of low pressure sewage draining valve respectively, after blowdown finishes, close above-mentioned three valves;
(3) the differential pressure calibration module is made of with differential pressure transmitter, process checking gauge A high-pressure hose, low-pressure hose, calibration, high-pressure hose one end is connected with the high pressure feed of calibration with differential pressure transmitter, low-pressure hose one end is connected with the low pressure input port of calibration with differential pressure transmitter, and calibration is connected with process checking gauge A with the delivery outlet of differential pressure transmitter; The pressure calibration module connects flexible pipe, modular pressure, process checking gauge B by pressure and constitutes, and pressure connects flexible pipe one end and is connected with the input end of modular pressure, and the output terminal of modular pressure is connected with process checking gauge B; With high-pressure hose be connected with the high pressure sewage draining exit of the high pressure blow-off pipe of steam flow measurement system, low-pressure hose is connected with the low pressure sewage draining exit of the low pressure blow-off pipe of steam flow measurement system, pressure connects the pressure sewage draining exit that flexible pipe connects the pressure blow-off pipe of steam flow measurement system;
(4) treat to be full of condensate water in each blow-off pipe after, Exhaust Open on the mutatis mutandis differential pressure transmitter of high-ranking officers, open high pressure sewage draining valve and the exhaust of low pressure sewage draining valve then simultaneously, make calibration with after the exhausr port drainage water of differential pressure transmitter, close the exhausr port of calibration with differential pressure transmitter, compensation flap on the equalizing valve valve body is closed, make equalizing valve return to duty, just can measure after waiting for about 30min system stability;
(5) read differential pressure value Δ P, pressure value P respectively at process checking gauge A, process checking gauge B, read the demonstration flow value of perforated plate-type steam flow measurement system simultaneously synchronously; By Density value, the detected differential pressure value of Δ P-of K-experience factor in the formula, ρ-find according to detected force value, calculate the actual flow value of perforated plate-type steam flow measurement system, in view of the above the demonstration flow value of perforated plate-type steam flow measurement system is revised.
2. the on-line calibration method of perforated plate-type steam flow measurement system as claimed in claim 1, wherein: process checking gauge A, process checking gauge B read differential pressure value, force value respectively, read simultaneously the demonstration flow value of perforated plate-type steam flow measurement system synchronously, the time of reading is 5-30mi n, during this period can be to read 30 data or more data arbitrarily at interval, calculate mean value separately respectively, go out the flow value of calibration equipment and the flow value of perforated plate-type steam flow measurement system with mean value calculation.
CN200910102808XA 2009-10-12 2009-10-12 Method for online calibrating perforated plate-type steam flow measurement system Active CN101672683B (en)

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CN104360625A (en) * 2014-10-11 2015-02-18 成都成设航空科技有限公司 Air supply measurement and control system for aircraft conditioner vehicle
CN105222837B (en) * 2015-09-29 2017-05-03 中国核动力研究设计院 Steam flow measuring method and steam flow measuring device thereof
CN108844592A (en) * 2018-04-11 2018-11-20 西安交通大学 A kind of condensed fluid collection measuring device and method based on pressure difference measuring signal

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