CN2201658Y - Differential pressure water level measuring component suitable for any operating mode - Google Patents
Differential pressure water level measuring component suitable for any operating mode Download PDFInfo
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- CN2201658Y CN2201658Y CN 94238937 CN94238937U CN2201658Y CN 2201658 Y CN2201658 Y CN 2201658Y CN 94238937 CN94238937 CN 94238937 CN 94238937 U CN94238937 U CN 94238937U CN 2201658 Y CN2201658 Y CN 2201658Y
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- water
- differential pressure
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- pressure
- water level
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The utility model provides a differential pressure water level measuring component which enables a differential pressure water level gauge to correctly display steam drum water levels under any operating conditions (that is any pressure and any water levels). The differential pressure water level measuring component is characterized in that a high position water column is totally arranged in a saturated steam cylinder; the pulse tube of the high position water column and the pulse tube of steam drum level are led out at the same height, and are arranged side by side to a secondary meter. When the utility model is used for a station boiler, the higher of rated working pressure, the high superiority can be displayed. Thus, the utility model is especially suitable for the steam drum boiler of extra high pressure and subcritical pressure.
Description
The utility model relates to the differential pressure type level measuring element of the differential pressure water level gauge that is used for thermal measurement.
Because differential pressure water level gauge is to show steam water-level with the differential pressure between high-order water column pulse tube of level measuring element and the steam water-level pulse tube by secondary instrument.General differential pressure type level measuring element does not adopt the saturated vapour tube, during boiler operatiopn, under identical water level, drum pressure rises, the severe of stove water reduces, the severe of steam increases, and in the high-order water column severe of water change little, so the differential pressure that records will rise and increase with drum pressure, the table meter shows decline of water table, and this just causes error.Drum pressure is high more, and error is big more.Subcritical pressure boiler steam water-level error can be greater than 200 millimeters.Therefore, second section of regulation of power industry boiler supervision rules SD167-85 5.3.5 bar: " the differential pressure type telemetering level meter should have pressure compensation, to guarantee can both show under the various operating modes variation of real water level in the drum.……”。Each cauldron factory is the supporting differential pressure type level measuring element of station boiler, be that high-order water column is partly placed in the saturated vapour tube, make this section water column often keep with the stove glassware for drinking water identical severe being arranged, use the influence that stove water severe is subjected to owing to the drum pressure variation in the compensation drum with the corresponding saturation temperature of drum pressure.During boiler operatiopn, adopt the differential pressure water level gauge of this structure can only when rated pressure and ordinary water level, correctly show steam water-level.Under rated pressure, steam water-level is high more, and negative error is big more; Steam water-level is low more, and positive error is big more.So exist this possibility: when the full water accident took place, the table meter showed as yet not full water; When the lack of water accident took place, the table meter showed as yet not lack of water.This possibility is a big hidden danger of safety in production.
The purpose of this utility model provides a kind of differential pressure type level measuring element, makes differential pressure water level gauge can both correctly show steam water-level down in any operating mode (being any pressure and any water level).
Design of the present utility model is to measure the high-order water column that all is under the saturation temperature and the differential pressure between the steam water-level, revise by the secondary instrument saturation water under the pressure of living in and severe difference of saturated vapor when measuring, thereby reach the purpose that under any operating mode, can both correctly show steam water-level.For this reason, the utility model is a kind of differential pressure type level measuring element that is used for the high-order water column of having of thermal measurement ［ 3 ］, high-order water column pulse tube ［ 1 ］ and steam water-level pulse tube ［ 2 ］ and adopts saturated vapour tube ［ 4 ］, it is characterized in that high-order water column ［ 3 ］ is all placed saturated vapour tube ［ 4 ］, high-order water column pulse tube ［ 1 ］ and steam water-level pulse tube ［ 2 ］ are drawn with drum water side connecting pipe ［ 2 ］ from saturated vapour tube ［ 4 ］ respectively at sustained height, are in juxtaposition towards secondary instrument.The relational expression of water level of the present utility model and differential pressure is:
X＝L－H－ (Δp)/(r′－r″)
In the formula: X---with the water level of normal water level of drum line ［ 11 ］ 0 steam water-level ［ 8 ］;
Vertical range between L---high-order water column ［ 3 ］ liquid level and water side connecting pipe ［ 7 ］ center line;
Vertical range between H---normal water level of drum line ［ 11 ］ and water side connecting pipe ［ 7 ］ center line;
Differential pressure between Δ P---high-order water column pulse tube ［ 1 ］ and the steam water-level pulse tube ［ 2 ］;
R ', r "---saturation water, vapour severe.
L, H are constants in the formula, (r '-r ") is the function of drum pressure.Differential pressure was Δ P when steam water-level was X, because the drum pressure of this moment determines, (r '-value of r ") also determines.Therefore, under arbitrary definite pressure, just can demonstrate corresponding steam water-level X by secondary instrument corresponding to any differential pressure Δ P.
Compared with prior art, the utility model has solved differential pressure water level gauge always can not correctly not show steam water-level under any operating mode problem, has eliminated the hidden danger that the water level accident takes place owing to differential pressure water level gauge is inaccurate.
Accompanying drawing is the structural drawing of the utility model embodiment.
In structural drawing shown in the drawings, the vapour source of saturated vapour tube ［ 4 ］ connects vapour side from drum ［ 5 ］ by vapour side connecting pipe ［ 6 ］; The drain pipe ［ 9 ］ of saturated vapour tube ［ 4 ］ is connected to drum boiler water downtake ［ 10 ］; Water level when guaranteeing boiler operatiopn in the drain pipe ［ 9 ］ is below the bottom of saturated vapour tube ［ 4 ］.The discrepancy in elevation between the contact of drain pipe ［ 9 ］ and downtake ［ 10 ］ and saturated vapour tube ［ 4 ］ bottom should be not less than 10m; High-order water column ［ 3 ］ all places saturated vapour tube ［ 4 ］; High-order water column pulse tube ［ 1 ］ and steam water-level pulse tube ［ 2 ］ steam tin ［ 4 ］ and the water side connecting pipe ［ 7 ］ of drum ［ 5 ］ is drawn from saturated respectively at sustained height; Be the error that the temperature difference of eliminating between two pulse tubes causes, two pulse tubes are in juxtaposition towards secondary instrument.During cold conditions, level measuring element each several part temperature is identical, and the water level in the saturated steam pipe ［ 4 ］ is consistent with steam water-level ［ 8 ］, and the vapour side is air or nitrogen, and its severe is all very little, can omit.The differential pressure Δ P that records during cold conditions is identical with general differential pressure type level measuring element.When hot, rising along with drum pressure, the stove coolant-temperature gage will the corresponding rising with the rising of saturation temperature, because the drain pipe ［ 9 ］ of saturated vapour tube ［ 4 ］ is uninsulated, hydrophobic medial temperature will be lower than the stove coolant-temperature gage in the drain pipe, be not less than in the discrepancy in elevation under the condition of 10m, this temperature difference is dropped rapidly to below the bottom water level in the saturated vapour tube ［ 4 ］ in the drum pressure uphill process, thereby high-order water column ［ 3 ］ all is among the saturated vapour and keeps saturation temperature, stove water and high-order water column in the drum all is in saturation temperature at this moment, this has just satisfied the condition of the utility model design, measure and all be in the high-order water column ［ 3 ］ of saturation temperature and the differential pressure Δ P between the steam water-level ［ 8 ］, revise by the secondary instrument saturation water under the pressure of living in and severe difference of saturated vapor when measuring, just can under any operating mode, correctly show steam water-level.When the utility model was used for station boiler, rated operating pressure was high more, can show its superiority more.Therefore, be specially adapted to UHV (ultra-high voltage) and subcritical pressure boiler dum boiler.
Claims (1)
- The utility model is a kind of differential pressure type level measuring element that is used for the high-order water column of having of thermal measurement [3], high-order water column pulse tube [1] and steam water-level pulse tube [2] and adopts saturated vapour tube [4], it is characterized in that high-order water column [3] is all placed saturated vapour tube [4], high-order water column pulse tube [1] and steam water-level pulse tube [2] are drawn with drum water side connecting pipe [7] from saturated vapour tube [4] respectively at sustained height, are in juxtaposition towards secondary instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94238937 CN2201658Y (en) | 1994-06-22 | 1994-06-22 | Differential pressure water level measuring component suitable for any operating mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94238937 CN2201658Y (en) | 1994-06-22 | 1994-06-22 | Differential pressure water level measuring component suitable for any operating mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2201658Y true CN2201658Y (en) | 1995-06-21 |
Family
ID=33846245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94238937 Expired - Fee Related CN2201658Y (en) | 1994-06-22 | 1994-06-22 | Differential pressure water level measuring component suitable for any operating mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2201658Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101788164B1 (en) | 2017-05-31 | 2017-11-15 | 인천화학 주식회사 | INDIRECT CONTACT DEVICE FOR MEASURING PRESSURE DIFFERENCE IN TiCl4 FLUIDIZED BED REACTOR |
-
1994
- 1994-06-22 CN CN 94238937 patent/CN2201658Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101788164B1 (en) | 2017-05-31 | 2017-11-15 | 인천화학 주식회사 | INDIRECT CONTACT DEVICE FOR MEASURING PRESSURE DIFFERENCE IN TiCl4 FLUIDIZED BED REACTOR |
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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 |