CN2742395Y - Large flow measuring device - Google Patents
Large flow measuring device Download PDFInfo
- Publication number
- CN2742395Y CN2742395Y CN 200420108275 CN200420108275U CN2742395Y CN 2742395 Y CN2742395 Y CN 2742395Y CN 200420108275 CN200420108275 CN 200420108275 CN 200420108275 U CN200420108275 U CN 200420108275U CN 2742395 Y CN2742395 Y CN 2742395Y
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- Prior art keywords
- measuring
- pressure
- section
- measuring device
- large flow
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Abstract
The utility model provides a large flow measuring device. The large flow measuring device is characterized in that the large flow measuring device is a split channel comprising a plurality of measuring channels whose two ends are connected with air ducts; each measuring channel is formed by the ordinal connection of a communicating segment, a compression section, a measuring section and a gradual expansion segment; the measuring section is provided with a pressure transmission pipe which receives the total pressure P1 and a static pressure P2 of the measuring section; the pressure transmission pipe is connected with a pressure difference transmitter; the dynamic pressure value of the measuring section delta P is obtained delta P=P1-P2, and the flow Q is calculated according to )>Q=nS[(2 delta P/ rho 0)273.15/(273.15+t]<1/2>. The large flow measuring device provided by the utility model has the advantages that the flow measuring is provided with a higher measuring accuracy; the whole system is provided with a higher anti-interference performance and a system stability; the measuring device itself has the ability of commutation and rotation removing; the length of a straight pipe segment required by a sensor is 0.8 times of the diameter of a measured pipe; the device is provided with manual and intelligent measuring functions and can be tested by itself; the temperature of a liquid and the pressure difference reference source can be tested so as to eliminate a system failure in time.
Description
Technical field:
The utility model relates to the gas flow measurement technology, high precision high flow rate measuring technique in the particularly modernized industrial production run.
Background technology:
In modernized industry such as electric power, metallurgy and chemical industry, extensively adopt the gas flow measurement technology, particularly the high precision high flow rate measuring technique is an indispensable gordian technique in the modernized industrial production run, existing gas flow measurement technology mainly adopts orifice plate, nozzle and wing etc. as primary instrument, measure the pressure of front and back, compression section, obtain the only pressure differential of tens handkerchiefs, try to achieve flow in view of the above, this method at measured flow hour also relatively accurately, but when measured flux was big, measuring accuracy was lower and be not suitable for modernization industry needs.Power industry is the basic industry of Chinese national economy, along with main force's genset by 200MW in 300MW and 600MW transition process, the boiler combustion system robotization is even more important to the large electric power plant unit safety operation.Traditional flow measurement device can't satisfy the requirement of large electric power plant unit burning robotization.
Summary of the invention:
The purpose of this utility model is to provide the measurement mechanism of a kind of high precision, big flow.
A kind of big flow measurement device, it is characterized in that: be the split road of forming by a plurality of measurement passages (2) that two ends link to each other with cigarette air channel (1), each measures passage by rectification section (3), compression section (7), measuring section (4) and divergent segment (5) formation that links to each other successively, be provided with pressure dispatch tube (6) in the measuring section (4), as examine than pipe, pitot tube etc., accept the total head P of measuring section (4)
1With static pressure P
2, pressure dispatch tube (6) links to each other with pressure difference transmitter; Obtain the dynamic pressure value Δ P=P of measuring section from pressure difference transmitter
1-P
2, again by formula (1) calculated flow rate Q:
Q＝nS[(2ΔP/ρ
0)273.15/(273.15+t)]
1/2 (1)；
In the formula: n---measure port number;
S---measuring section sectional area;
ρ
0---normal atmosphere density, 1.29kg/m
3
T---gas temperature.
The pressure difference transmitter of the big flow measurement device that the utility model provides can adopt Programmable Logic Controller (PLC), carries out computing by formula (1) in Programmable Logic Controller, obtains flow value.
The pressure difference transmitter of the big flow measurement device that the utility model provides can link to each other with self-checking system; Whether within the limits prescribed to check Δ P, make total system have advantages of higher stability.
The big flow measurement device pressure difference transmitter that the utility model provides can link to each other with failure warning system, is convenient in time overhaul the removal system fault.
The advantage of the big flow measurement device that the utility model provides is:
1, flow measurement has higher measuring accuracy;
2, total system has higher anti-interference and system stability;
3, measurement mechanism itself has rectification, racemization ability, and it only is 0.8 times of equivalent diameter of measured tube that sensor requires flow development length;
4, this device have manually, the intelligent measure function, can carry out self check, but convection cell temperature, pressure reduction reference source are tested at any time;
5, be convenient in time overhaul the removal system fault.
Description of drawings:
Fig. 1 is a kind of structural representation of big flow measurement device.
Embodiment:
Embodiment 1
A kind of big flow measurement device, its structural representation as shown in Figure 1, its two ends are the pipelines that link to each other with cigarette air channel (1), the split road (2) that the centre is made up of a plurality of measuring channels, each measures passage by rectification section (3), compression section (7), measuring section (4) and divergent segment (5) formation that links to each other successively, be provided with in the measuring section (4) and examine, examine ram-air pipe P than pipe (6) than pipe (6)
1With static tube P
2Link to each other with pressure difference transmitter, the output of pressure difference transmitter and Programmable Logic Controller (PLC) are electrically connected, and Programmable Logic Controller (PLC) obtains flow value by formula (1) computing.
The output of pressure difference transmitter also links to each other with self-checking system, whether within the limits prescribed to check Δ P; The output of examining than pipe (6) and pressure difference transmitter links to each other with the warning system (electric bell and warning lamp) that adopts the Anti-Jamming Technique fault.
The performance that this device reaches is as follows:
1, error＜5% between the pressure point of flow measurement cross section;
2, flow measurement cross section velocity deviation rate＜5%;
3, the resistance to flow＜250Pa of measurement mechanism under rated load;
4, the sensor machine adds error＜1.5%;
5, pressure difference transmitter, temperature transmitter output area 4～20mA
6, when measured flux greater than 1 * 10
5Nm
3/ h, measuring error＜8%.
Claims (4)
1, a kind of big flow measurement device, it is characterized in that: be the split road of forming by a plurality of measurement passages (2) that two ends link to each other with cigarette air channel (1), each measures passage by rectification section (3), compression section (7), measuring section (4) and divergent segment (5) formation that links to each other successively, be provided with pressure dispatch tube (6) in the measuring section (4), pressure dispatch tube (6) links to each other with pressure difference transmitter.
2, according to the described big flow measurement device of claim 1, it is characterized in that: described pressure difference transmitter output signal obtains actual flow by the Programmable Logic Controller computing.
3, according to claim 1 or 2 described big flow measurement devices, it is characterized in that: described secondary instrument links to each other with self-checking system.
4, according to claim 1 or 2 described big flow measurement devices, it is characterized in that: described pressure dispatch tube (6) or pressure dispatch tube link to each other with failure warning system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108275 CN2742395Y (en) | 2004-10-10 | 2004-10-10 | Large flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108275 CN2742395Y (en) | 2004-10-10 | 2004-10-10 | Large flow measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2742395Y true CN2742395Y (en) | 2005-11-23 |
Family
ID=35477863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420108275 Expired - Fee Related CN2742395Y (en) | 2004-10-10 | 2004-10-10 | Large flow measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2742395Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023236513A1 (en) * | 2022-06-08 | 2023-12-14 | 西安热工研究院有限公司 | Processing method for flue gas and air duct measurement section, and flue gas and air duct measurement section |
-
2004
- 2004-10-10 CN CN 200420108275 patent/CN2742395Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023236513A1 (en) * | 2022-06-08 | 2023-12-14 | 西安热工研究院有限公司 | Processing method for flue gas and air duct measurement section, and flue gas and air duct measurement section |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |