CN1506665A - Measurement method of true value of water level in boiler steam packet and water level gauge - Google Patents
Measurement method of true value of water level in boiler steam packet and water level gauge Download PDFInfo
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- CN1506665A CN1506665A CNA021447993A CN02144799A CN1506665A CN 1506665 A CN1506665 A CN 1506665A CN A021447993 A CNA021447993 A CN A021447993A CN 02144799 A CN02144799 A CN 02144799A CN 1506665 A CN1506665 A CN 1506665A
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- water level
- level gauge
- platinum wire
- insulating layer
- malleation
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention belongs to the field of measurement technology. On the positive side H section of water level gage balancing container, one inner insulating layer, resistive platinum wire and one outer insulating layer are wound successively. During measurement, the resistive platinum wire connected to a computer is used to measure average temperature in the inhomogeneous temperature field for reliable correction of measured water level in the steam packet, and the H section is used to measure the positive pressure between the positive pressure top and the negative pressure top. The present invention can measure water level in boiler steam packet precisely and has reliable performance, simple process and low cost.
Description
Technical field:
The invention belongs to test, field of measuring technique, be a kind of method of measuring boiler drum level and measure in the water level gauge that uses.
Background technology:
As everyone knows, this parameter of boiler drum level is the parameter of extremely important safe operation, if steam water-level departs from normally, reach extreme value and can cause blowing out to shut down, even bigger industrial accident.Therefore, paid close attention to by relevant scholar just rising that day of the own boiler of the measurement of steam water-level always, the undergraduate education teaching material that now provides has been enumerated a lot of methods, but still exist very large deviation (these teaching materials are attached) especially open, in the furnace shutting down process, these deviations even cause water level gauge insincere.
Sketch the measuring method of steam water-level and the problem of existence referring now to accompanying drawing 2.ρ s is the proportion of steam among the figure
ρ
wProportion for water
ρ
aFor the malleation of equalizing reservoir is surveyed water column proportion
It is definite value that H is generally 600-700mm
Δ P is a pressure reduction, is the signal source of measuring the steam water-level height
According to existing conclusion:
ΔP＝Hρ
a-h
1ρ
s-h
2ρ
w (1)
H in the formula
1+ h
2=H
Above-mentioned formula is set up
In formula (1), H is known, ρ
s, ρ
wMeasurement by drum pressure also is known, h
1, h
2Be not decided to be knownly yet, have ρ only
aBe not fix a number, record in practice that its top reaches more than 200 ℃ in the H scope, the bottom in environment temperature, the past be this numerical value as reference value, spent a large amount of painstaking effort of a lot of people, have no resolution, be the epoch of relying in that computing machine is arranged today, calculates the key of (1) formula and have only ρ always
aWhy be worth, if can be ρ
aValue is decided and is revised at any time with the variation of drum pressure and environment temperature, so H* ρ
aThis value has just really become reliable reference value.
Summary of the invention:
The technical problem to be solved in the present invention is to disclose a kind of malleation that can obtain equalizing reservoir accurately to survey water column proportion, thereby accurately tries to achieve the measuring method and the water level gauge of boiler drum level true value in opening, stop the boiler overall process.
The scheme of technical solution problem of the present invention is to survey on the H pipeline section in the malleation of water level gauge equalizing reservoir to twine inner insulating layer, and inner insulating layer evenly is wound with resistive platinum wire outward, and external insulation layer is twined in the resistive platinum wire outside again.The method of measuring is to enter computer simulation amount input port at the resistive platinum wire two ends with 4 line systems, measure the mean value of the temperature of a uneven temperature field, reach infinite the average weighted effect of measuring point, the medial temperature of being asked for, cooperate drum pressure again, got cold ρ easily
aThe value, as drum level measurement reliably on the occasion of, adopt existing computing formula (Δ P=H ρ
a-h
1ρ
s-h
2ρ
w) obtain pressure reduction, wherein the H pipeline section is that the malleation of water level gauge equalizing reservoir is surveyed the malleation that top to negative pressure surveys between the height of top and surveyed pipeline section.
For the temperature on the resistive platinum wire is not is not scattered and disappeared, on external insulation layer, be wound with heat-insulation layer.
Method of the present invention and water level gauge can accurately be measured boiler drum level, dependable performance, and method is simple, and cost is low.
Description of drawings:
Fig. 1 is the cut-open view of water level gauge of the present invention.
Embodiment:
Inner insulating layer 2 is twined in the present invention on water level gauge body 1, evenly be wound with resistive platinum wire 3 outside the inner insulating layer 2, and external insulation layer 4 is twined in resistive platinum wire 3 outsides again, is wound with heat-insulation layer 5 on external insulation layer 4.Wherein resistive platinum wire 3 can be standard value 100 Ω or 10 Ω, and inner insulating layer 2 can be mica or glass tape, and external insulation layer 4 is a glass tape, and heat-insulation layer 5 is an asbestos rope.Enter computer simulation amount input port at the resistive platinum wire two ends with 4 line systems during measurement, wherein computing machine adopts this machine of SIMATIC S7-300 PLC to have special software, measure the mean value of the temperature of a uneven temperature field, reach infinite the average weighted effect of measuring point, the medial temperature of being asked for, cooperate drum pressure again, got cold ρ value easily, as drum level measurement reliably on the occasion of.By to one 670 tons/time boiler test, draw the steam water-level and the temperature, pressure table of comparisons:
Claims (3)
1, a kind of water level gauge of boiler drum level true value is characterized in that: the malleation of water level gauge equalizing reservoir is surveyed on the H pipeline section and is twined inner insulating layer, and inner insulating layer evenly is wound with resistive platinum wire outward, and external insulation layer is twined in the resistive platinum wire outside again.
2, water level gauge according to claim 1 is characterized in that: be wound with heat-insulation layer on the external insulation layer.
3, a kind of measuring method of boiler drum level true value, it is characterized in that: utilize claim 1,2 described water level gauges, enter computer simulation amount input port at the resistive platinum wire two ends with 4 line systems, measure the mean value of the temperature of a uneven temperature field, reach infinite the average weighted effect of measuring point, the medial temperature of being asked for cooperates drum pressure again, has got cold ρ easily
aThe value, as drum level measurement reliably on the occasion of, adopt existing computing formula (Δ P=H ρ
a-h
1ρ
s-h
2ρ
w) obtain pressure reduction, wherein the H pipeline section is that the malleation of water level gauge equalizing reservoir is surveyed the malleation that top to negative pressure surveys between the height of top and surveyed pipeline section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021447993A CN1506665A (en) | 2002-12-12 | 2002-12-12 | Measurement method of true value of water level in boiler steam packet and water level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021447993A CN1506665A (en) | 2002-12-12 | 2002-12-12 | Measurement method of true value of water level in boiler steam packet and water level gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1506665A true CN1506665A (en) | 2004-06-23 |
Family
ID=34232119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021447993A Pending CN1506665A (en) | 2002-12-12 | 2002-12-12 | Measurement method of true value of water level in boiler steam packet and water level gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1506665A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368779C (en) * | 2005-02-03 | 2008-02-13 | 东北电力学院 | Safety on-line monitor for water circulation of boiler |
| WO2009046579A1 (en) * | 2007-10-10 | 2009-04-16 | Beijing Capstar Automation Instrument Co., Ltd | An all working condition continuously measuring liquid level meter for a steam drum of a boil and the liquid level computing method thereof. |
| CN102095467A (en) * | 2011-02-01 | 2011-06-15 | 蒋勤舟 | High-precision liquid level sensing device |
-
2002
- 2002-12-12 CN CNA021447993A patent/CN1506665A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368779C (en) * | 2005-02-03 | 2008-02-13 | 东北电力学院 | Safety on-line monitor for water circulation of boiler |
| WO2009046579A1 (en) * | 2007-10-10 | 2009-04-16 | Beijing Capstar Automation Instrument Co., Ltd | An all working condition continuously measuring liquid level meter for a steam drum of a boil and the liquid level computing method thereof. |
| CN102095467A (en) * | 2011-02-01 | 2011-06-15 | 蒋勤舟 | High-precision liquid level sensing device |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |