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

A technology of steam flow and measurement system, applied in the field of calibration of steam flow measurement system, can solve the problems of increasing production cost, troublesome orifice plate disassembly, increasing investment cost, etc., and achieves the effect of improving accuracy, quick calibration and intuitive data.

Active Publication Date: 2010-03-17
CHINA TOBACCO GUIZHOU IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing orifice plate type steam flow measurement system mainly has the following problems: (1) Regular inspection and maintenance of the orifice plate is required (because the disassembly of the orifice plate is more troublesome, usually enterprises only perform inspection and maintenance once after using it for several years, which makes it an influence One of the accuracy factors of measurement results); (2) After the system has been used for a certain period of time, in order to eliminate measurement errors, it is necessary to remove the differential pressure transmitter, pressure transmitter and totalizer from the system and send them to the laboratory (Enterprises without verification capabilities need to send to relevant testing agencies) for calibration
All of the above factors require shutdown operations, which affects production efficiency and increases production costs
In order to ensure that the equipment used in the orifice plate steam flow measurement system does not affect the normal production during the calibration period, the manufacturer usually needs to configure spare parts, among which the pressure transmitter costs thousands of yuan, and the differential pressure transmitter costs 3-4 thousand yuan. A cigarette factory with an annual output of one million boxes needs to prepare nearly a hundred differential pressure transmitters and pressure transmitters, which undoubtedly increases its investment cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take the calibration of steam flow detection points in the raw silk section of Guiyang Cigarette Factory as an example:

[0016] An online calibration method for an orifice-plate steam flow measurement system, comprising the following steps:

[0017] (1) Open the balance valve on the balance valve of the orifice steam flow measurement system to make the high and low pressure ends equal;

[0018] (2) Close the high-pressure end valve and low-pressure end valve on the balance valve, respectively open the pressure sewage valve, high-pressure sewage valve and low-pressure sewage valve to discharge sewage, and close the above three valves after the sewage discharge is completed;

[0019] (3) The differential pressure calibration module consists of a high-pressure hose, a low-pressure hose, a differential pressure transmitter for calibration, and a process calibrator A. One end of the high-pressure hose is connected to the high-pressure input port of the differential pressure...

Embodiment 2

[0036] Take the calibration of steam flow detection points in the raw silk section of Guiyang Cigarette Factory as an example.

[0037] The online calibration method of the orifice-plate steam flow measurement system is the same as that in Embodiment 1.

[0038] According to the "Calculation Book" of the design unit, it is found that k=0.4056937.

[0039] The test data is as follows (the units in the table are different, and the working ranges of the representative pressure and differential pressure are different):

[0040]

[0041] Check the saturated steam density table:

[0042] When the absolute pressure is 1.201020MPa, the saturated steam density is 6.132;

[0043] When the absolute pressure is 1.227891MPa, the saturated steam density is 6.264.

[0044] Through interpolation calculation, it can be obtained that when the relative pressure is 1.121MPa and the absolute pressure is 1.2104MPa, the saturated steam density is 6.178.

[0045] Substitute the differential pr...

Embodiment 3

[0048]Take the calibration of steam flow detection points in the fermentation section of Guiyang Cigarette Factory as an example:

[0049] The online calibration method of the orifice-plate steam flow measurement system is the same as that in Embodiment 1.

[0050] According to the "Calculation Book" of the design unit, it is found: k=0.4918.

[0051] The test data is as follows (the units in the table are different, and the working ranges of the representative pressure and differential pressure are different):

[0052]

[0053] Check the saturated steam density table:

[0054] When the absolute pressure is 0.5021MPa, the saturated steam density is 2.679;

[0055] When the absolute pressure is 0.515535MPa, the saturated steam density is 2.747.

[0056] Through interpolation calculation, when the relative pressure is 0.423MPa and the absolute pressure is 0.5124MPa, the saturated steam density is 2.7311.

[0057] Substitute the differential pressure 0.571kpa, density 2.73...

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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 ahigh-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, 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 theproduction efficiency and reduce the equipment investment cost.

Description

technical field [0001] The invention relates to the technical field of calibration of a flow measurement system, in particular to a calibration method of a steam flow measurement system. Background technique [0002] Orifice plate steam flow measurement system is also called differential pressure flowmeter. The system is composed of orifice plate, pressure guiding pipe, differential pressure transmitter, pressure transmitter, totalizer and display. The system realizes the measurement of steam flow through indirect measurement, that is, the parameter values ​​on the right side of the classic flow equation are obtained through separate measurement, calculation and table lookup, and then brought into the classic flow equation to calculate the measured flow, which is displayed on the display come out. Since the birth of the orifice plate steam flow measurement system, it has become the most widely used steam flow measurement system with the largest number of installations and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F25/00
Inventor 张国洪蒋友刚范吉昌杨灏王小力马云守成明姚纯
Owner CHINA TOBACCO GUIZHOU IND
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