CN1147086A - Datum constant level balance container with multiple protection - Google Patents
Datum constant level balance container with multiple protection Download PDFInfo
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- CN1147086A CN1147086A CN 95116076 CN95116076A CN1147086A CN 1147086 A CN1147086 A CN 1147086A CN 95116076 CN95116076 CN 95116076 CN 95116076 A CN95116076 A CN 95116076A CN 1147086 A CN1147086 A CN 1147086A
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Abstract
An improved water level sampling device used for differential low-level meter for boiler steam dome can be used to measure theoretical gravity level of two-phase (steam and water) pressure container, and features that the influence of room temp, "zero point" drift and false level are eliminated and it adapts to parameter-changeable and full-working-conditions running of boiler.
Description
The present invention is application for a patent for invention number [91100647,8], January 30 91 year applying date, application for a patent for invention title: the dividing an application of combined steam manifold water level sampler.
The present invention relates to the electrode type water level gauge that industry, station boiler drum teletransmission level measuring are used, the shared a kind of improved water level sampler of differential pressure type water level gauge is combined steam manifold water level sampler one by one.It is applicable to carbonated drink two-phase pressure container water level measuring, is particularly useful for boiler drum water level measurement.
The water level sampler pattern that existing domestic industry, station boiler steam bag level measuring are used has: electrode level meter list container measurement tube, all kinds of high-order benchmark reference equalizing reservoirs of differential pressure type water level gauge etc.The common defects of above-mentioned measurement tube and equalizing reservoir is: the water column density error that exists the room temperature heat radiation to cause: the high-order benchmark reference of differential pressure type class equalizing reservoir also exists boiler parameter to change introduction water level indicating gauge " 0 " position drift error; Saturated section equalizing reservoir of high-order reference tape also exists meets saturated section of vapour pressure rapid drawdown and causes water level indicating gauge transient state misalignment error from boiling vaporization dehydration.Two 12 the uniform electrode measurement tubes of file of external a kind of (hYDRASTEP7) type twin containers by name, though there is not above-mentioned defective, but exist the electrode measurement inner tube structure unreasonable, two column electrode arrangements are difficult near intensive layout electrode frequent normal " 0 " water level of fluctuation of water table, directly influence near measuring accuracy normal " 0 " water level of drum.General only suitable being arranged in separately on the water level sampling hole of drum diverse location of the measurement tube of the above all kinds of water level gauge and equalizing reservoir, different to survey water level be inconsistent each position or transversal section vertically because boiler is at operating condition water drum water level, the measurement tube that adds all kinds of water level gauges that measuring principle is different is different with equalizing reservoir error rule, therefore existing many water level gauges of boiler-steam dome are difficult to obtain two covers and can show identical and near the reliable water level gauge of drum real water level, the operations staff is difficult to judge the error or the misalignment state of drum low-water level meter, this differentiates for the boiler operatiopn personnel and the monitoring steam water-level brings blindly and difficulty, it can cause steam quality to worsen, the efficiency of cycle reduces, even the entail dangers to steam turbine, the safety of boiler main equipment.
Task of the present invention is that different electrode type water level gauge, the differential pressure type water level gauges of using for boiler-steam dome teletransmission level measuring of measuring principle provides a kind of shared water column density error that exists the room temperature heat radiation to cause hardly, there is not the zero shift error, do not have the combined steam manifold water level sampler of instrument misalignment error:
Equalizing reservoir part solution of the present invention is as follows: the main measurement is full of the drum saturated vapor that imports from vapour communicating pipe 15 in the tube, condensing water vapor causes downtake 19 by tapping pipe 20, become the water column in the inner barrel 4 of water connected state to be can be considered saturation water with drum liquid to the space by heating continuously, it becomes statics weight equipotential equilibrium state with the interior saturated water level of theoretical severe of drum, be arranged in main zero reference pipe 5 water columns of measuring tube 1 and also be heated to form state of saturation, it is to keep permanent position state for supposition earlier, then the theoretical severe water table ratio that is changing in it and the inner barrel 4, its output differential pressure and water level conversion relational expression have:
ΔP＝(H-Ho)(Yw-Ys)……(-)
Δ P--exports differential pressure
Ho--lateral water sampling tube center to " 0 " height of water level
Theoretical severe water level in the H--state of saturation water drum
Yw--saturation water severe (not containing steam bubble)
Ys--saturated vapor unit weight
1, the end occurs being subjected to the variable (Ya) of room temperature influence to show that differential pressure Δ P is not subjected to room temperature influence in the formula.
2, when H＞Ho, Δ P is that Δ P is a negative value when, H＜Ho, Δ P=0 when H=Ho, and this steam water-level with our custom address is positive and negative, zero level is consistent and show that vapour pressure changes, indicating gauge " 0 " not drift of position when " 0 " water level.
3, when H be definite value, Δ P=f (Yw-Ys) then shows that vapour pressure changes and only causes that the gauge glass amplitude changes that differential pressure (Δ P) obtains water level value (H-Ho) through the vapour pressure compensation.
For this reason, the measure that the present invention takes is to have kinds of protect equalizing reservoir and an inner barrel transversal section to be bent polygonal double container three column electrode water level measuring tube by the permanent position of a prover pipe to combine, have in the kinds of protect equalizing reservoir in the permanent position of prover pipe, the main tube 1 measured is other and show its cross-sectional area and pay wide vessel 2 than big tens of times of the cross-sectional area of zero reference pipe 5, the bottom of paying wide vessel 2 communicates with zero reference pipe 5, and the top is communicated to inner barrel 4 middle and upper parts with U trap 3; Be in the polygonal double container three column electrode water level measuring tube in the inner barrel transversal section, bent polygonal inner barrel 4 is that three files contact with the main inwall of measuring tube 1, three file potential electrode 18 are arranged in the contact site, insert into the inner through electrode tip holder 17, the zero reference pipe 5 that communicates with pair wide vessel 2 bottoms is isometrical pipes.
There is the protection automatically of three covers the permanent position of equalizing reservoir prover pipe of the present invention after taking above-mentioned measure, and its protection philosophy is summarized as follows:
1) vapour communication pipe 8, U trap 3 constantly will be led and measure a saturated vapor importing pair wide vessel 2 in the tube 1 under the nominal situation, pay wide vessel 2 circumference is arranged, the room temperature film-cooled heat that the upper and lower part is bigger, saturated vapor is condensation continuously therein, paying in the wide vessel 2 has the degree of supercooling condensate water to become the not free equilibrium state of equipotential weight with saturation water in the prover pipe 5, condensate water constantly replenishes zero reference pipe 5 by anti-rainbow mode through benchmark head efferent duct 7, and zero reference pipe 5 upper port are kept permanent position from overflowing.
2) rapid drawdown by a small margin in meeting vapour pressure, because pair wide vessel 2 cross-sectional area numbers of contain degree of supercooling condensate water decuple the cross-sectional area of prover pipe 5, the wide vessel 2 that obtains the water column that saturated water column self-boiled in the zero reference pipe 5 is risen vaporization loss paying reduces a trace and highly takes advantage of the water yield of its cross-sectional area to replenish, the water surface in the zero reference pipe 5 after the balance reduces a micro-height of water level than the also low approximate wide vessel 2 of paying of permanent plane, recovers permanent position through a process condensate water after replenishing.Illustrate, suppose that the dehydration of zero reference pipe highly is (Ho)=335mm, supposition pair wide vessel 2 cross-sectional areas are 100 times of zero reference pipe cross-sectional areas again, prover pipe side fluid loss is Ho * 1, and paying wide vessel 2 rate of water make-ups is X * 100, i.e. Ho * 1=X * 100,335 * 1=X * 100, X=3.35MM illustrates that the dehydration of zero reference pipe replenishes back transient state mistake perseverance and highly is about 3.35MM, and measuring error is very little.
3) when meeting vapour pressure rapid drawdown significantly, occur three kinds of phenomenons simultaneously, i.e. the serious dehydration of zero reference water level supposes that dehydration highly is (3Ho) this moment; Steam water-level rises to high water stage rapidly, and this is by due to a large amount of liquid phases vaporization steam water-levels are raised in the boiler; Inner barrel 4 water levels rise suddenly to high water stage with steam water-level.When water level rises to U trap 3 top height; there is the water that from inner barrel 4, attracts to flow in the U trap 3 and pays wide vessel 2; making 5 dehydrations of zero reference pipe obtain above-mentioned two kinds of protections U trap 3 of getting back moisturizings the time replenishes from inner barrel 4 water transfer; when steam water-level descends; water level be lower than U trap 3 tops until U trap 3 in inner barrel 4 connectors upper ends still in moisturizing; this phenomenon is called siphon, and vapour communication pipe 8 plays all pressure effects in the siphonic process.Moisturizing stops when water level is lower than this connector.Because U trap 3 internal diameters are than cutting down 16 little many times water side communicating pipe; the siphon water transfer does not influence the height that inner barrel 4 middle water levels should be raised to; U trap 3 moisturizings in time, reliably; have again and postpone the moisturizing function and inexcessive; illustrate, suppose benchmark may dehydration height 3Ho (3 * 335mm ≈ 1000mm), through 1), 2) the permanent position of a protection; the error that produces, routine benchmark loses perseverance in the reference 10mm highly approximately.Vapour pressure significantly the relative steam water-level of rapid drawdown to rise suddenly be a growth process, air pressure is rapid drawdown early stage significantly, steam water-level will rise suddenly, thereby, because U trap 3 siphon water transfer appear at benchmark dehydration 1H.Or also earlier the time, implement, stop until the vapour pressure rapid drawdown, so benchmark to lose permanently in units millimeter level, the permanent position of benchmark is reliable.
Electrode measurement tube part solution of the present invention is as follows: water column is that saturation water becomes the equipotential balance with the interior saturation water of drum in the inner barrel 4 as mentioned above, thereby stretch into electrode 18 in the inner barrel 4, according to carbonated drink conductance difference, record steam water-level, show and eliminate room temperature heat radiation error, do not have " 0 " position drift error again.Because inner barrel 4 be non-pressure-bearing thin walled tube, its temperature and saturated vapor isothermal can not draw to become to coagulate water condition, thereby can eliminate vapour lateral electrode extension water and cause artifical water height.
The present invention is for improving the dual-container electrode water level measuring precision, inner barrel 4 is improved, inner barrel 4 is made a kind of transversal section be converting pipe at the bottom of the bent polygonal band, (transverse shape as shown in Figure 2), or a kind ofly be arranged in juxtaposition by three pipes, the transversal section is the combination shape cylindrical shell of the bent polygon (as shown in Figure 3) of " product " word shape locally connected's (transverse shape is as shown in Figure 2) at the end.This cylindrical shell following side communicates with drum water side, main tube 1 inwall of measuring is close on bent polygon three limits, be to stretch into electrode hole circle of position Zhou Erzhe for the ease of three files to be close to the position welding, add the weld layer width between file two electrodes and allow distance to be 45mm, minor increment then can reach 45mm * 1/3=15mm between the staggered electrode of three files.Thereby can be implemented in three files layout potential electrode on the twin containers, so improved the electrode measurement precision.
After taking above-mentioned measure, the present invention can have the optional one of four kinds of purposes all not influence accuracy, reliability, and its four kinds of purposes are: the electrode type water level gauge, the differential pressure type water level gauge is united use; Pure electrode type water level gauge; Pure differential pressure type water level gauge; Electrode alarm and protection, differential pressure type water level gauge are united use.
Advantage of the present invention be the different water level gauge of electrode differential pressure two cover measuring principles can be synchronously, accurately, reliable, card record the saturated water level of theoretical severe in the drum mutually, there is not room temperature heat radiation influence in two kinds of water level signals, there is not the drift of " 0 " position, do not have artifical water height.Have remarkable steam quality and the energy-saving effect of improving, can guarantee boiler turbine main equipment safety.
Embodiments of the invention as shown in drawings.
Accompanying drawing 1 is a structural representation of the present invention.
Accompanying drawing 2 is A-A cut-open views.
Accompanying drawing 3 is B-B cut-open views.
Accompanying drawing 4 is equalizing reservoir structural representations.
The present invention includes main tube 1, inner barrel 4, zero reference pipe 5, the potential electrode 18 measured, wherein had permanent bit strip kinds of protect equalizing reservoir of a prover pipe and inner barrel transversal section and be polygonal double container three column water level measuring cylinder.
Measure other the showing of tube 1 and pay a wide vessel 2, pay a wide vessel 2 and communicate with zero reference pipe 5 main, zero reference pipe 5 be isometrical pipe, and vapour communication pipe 8 will be led and measure tube 1 and communicate the U trap of ining succession and communicate with inner barrel 4 in pair wide vessel 2 tops 3 with pair wide vessel 2 steam chests.Normal " 0 " water level of the height flat drum of zero reference pipe 5, the flat-shaped benchmark head of its underpart water receiving efferent duct 7 are communicated with to be paid wide vessel 2 and is switched to benchmark head pulse tube 12.The sectional area of paying wide vessel 2 is multiple times than the sectional area of zero reference pipe 5, its water storage height has downwards from normal " 0 " water level of drum and is no less than 2/3 of zero reference length of tube, pay U trap 3 that wide vessel 2 communicates with inner barrel 4 and be to draw to pass through and mainly measure tin 1 from inner barrel 4 middle upper section parts, be bent upwards the back and cause the top steam chest of paying wide vessel 2 down, the siphon height of U trap 3 is no more than peak level, and vapour communication pipe 8 is above connection of normal " 0 " water level to pay wide vessel 2 steam chests and the main tube 1 of measuring.Draw to connect in the bottom side of inner barrel 4 and change head efferent duct 9, interface height and benchmark head efferent duct 7 are contour and all with water side communicating pipe to cut down 16 centre-heights consistent.
In the accompanying drawing: 1, main measuring cylinder 2, pay wide vessel 3, siphon pipe 4, inner barrel 5, zero reference pipe 6, main measuring cylinder base plate 7, benchmark head efferent duct 8, vapour communication pipe 9, change head efferent duct 10, water communication short tube 11, change head pulse tube 12, benchmark head pulse tube 13, drain the mouth of pipe 14, interior tube end plate 15, vapour side communicating pipe cuts down 16, water side communicating pipe cuts down 17, electrode tip holder 18, measurement electrode 19, down-comer 20, excretory duct cuts down 21, drum
Claims (2)
1, a kind of datum constant level balance container with multiple protection; include main tube (1), inner barrel (4), the zero reference pipe (5) measured; it is characterized in that: the main tube (1) of measuring is other and show its cross-sectional area and pay wide vessel (2) than big tens of times of the cross-sectional area of zero reference pipe (5); the bottom of paying wide vessel (2) communicates with zero reference pipe (5), and the top is communicated to inner barrel (4) middle and upper part with U trap (3).
2, a kind of datum constant level balance container with multiple protection according to claim 1 is characterized in that zero reference pipe (5) is isometrical pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95116076 CN1081322C (en) | 1991-01-30 | 1995-10-11 | Datum constant level balance container with multiple protection |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91100647.8 | 1991-01-30 | ||
| CN 91100647 CN1035455C (en) | 1991-01-30 | 1991-01-30 | Combined steam manifold water level sampler |
| CN 95116076 CN1081322C (en) | 1991-01-30 | 1995-10-11 | Datum constant level balance container with multiple protection |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91100647 Division CN1035455C (en) | 1991-01-30 | 1991-01-30 | Combined steam manifold water level sampler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147086A true CN1147086A (en) | 1997-04-09 |
| CN1081322C CN1081322C (en) | 2002-03-20 |
Family
ID=25742682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95116076 Expired - Fee Related CN1081322C (en) | 1991-01-30 | 1995-10-11 | Datum constant level balance container with multiple protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1081322C (en) |
-
1995
- 1995-10-11 CN CN 95116076 patent/CN1081322C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1081322C (en) | 2002-03-20 |
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