CN100460833C - Single solid bowl type electrode measurement tube in high precision for water level of steam tank, and method for determining geometrical size - Google Patents
Single solid bowl type electrode measurement tube in high precision for water level of steam tank, and method for determining geometrical size Download PDFInfo
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- CN100460833C CN100460833C CNB2006100976194A CN200610097619A CN100460833C CN 100460833 C CN100460833 C CN 100460833C CN B2006100976194 A CNB2006100976194 A CN B2006100976194A CN 200610097619 A CN200610097619 A CN 200610097619A CN 100460833 C CN100460833 C CN 100460833C
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Abstract
A high accuracy electrode measurement cylinder of steam pocket water level single-cylinder type is prepared for improving structure of traditional single-cylinder measurement cylinder, decreasing surface area of sampling water column cylindrical body i.e. decreasing diameter of cylindrical body and increasing area of steam dome cylindrical body i.e. increasing diameter and height of steam dome for satisfying surface area ratio to be less than 0.7 of water column cylindrical body to steam dome cylindrical body.
Description
Technical field:
The present invention relates to the thermal measurement art, particularly high pressure, UHV (ultra-high voltage), subcritical boiler steam water-level electric pole type sampling sensing measuring technique specifically are that a kind of single solid bowl type electrode measurement tube in high precision for water level of steam tank and physical dimension thereof are determined method.
Background technology:
Steam water-level is the important safety parameter of boiler operatiopn.In boiler operatiopn, vapour, water in the drum can not separate fully, and its interface is ambiguous mixolimnion, are defined as actual water level and change maximum point along short transverse humidity in the mixolimnion.The actual water level face is above to be the saturated vapor steam chest, below is the drum hydroecium.Because the actual water temperature in the drum is lower than the saturation water temperature, water belongs to undersaturation water, and the temperature difference of actual water temperature and saturation water will change and change along with operating condition, again owing to contain saturated vapor " steam bubble " in the hydroecium, so accurately measure actual water level and be used for the difficult point of water level control also a lot.Therefore, people propose quality water level notion, suppose that promptly the vapour in the drum separates fully with water, and water temperature is the saturation water temperature, and formed carbonated drink interfacial level then be the interior quality water level of drum.The boiler long-time running facts have proved; quality water level and actual water level differ less; the drum electric contact point fluviograph is accurately measured the quality water level and just can well actual water level be controlled in the scope that boiler industry allows, institute's mass metering water level also accurately conduct for actual water level the action protection when out-of-limit.
Electric contact point fluviograph is a device of measuring drum quality water level, is the most important safety instrument of boiler-steam dome.The steam water-level electrode measurement tube is the survey sensor of electric contact point fluviograph, and it is measured sensing principle and is: vapour, the water sampling pipe of measuring tube links to each other with drum and constitute linker, measures water column in the tube for measuring the water column of taking a sample; A plurality of electrodes of installing on cylindrical shell between vapour, the water sampling pipe constitute surveyors' staff, and the electrode sensing head is a scale label; The resistance to earth of electrode sensing head in water column is low resistance, and the resistance to earth in saturated vapor is a high value, can differentiate the electrode sensing head whether in water column so measure resistance to earth; Detect the alternative drum endoplasm water gaging position of measuring of a water level in the measurement tube with the electrode scale.Therefore, measuring accuracy depends on the error of sampling water column and steam water-level.
It is monotubular straight cylinder formula that traditional electrode is measured tube; the defective of barrel designs is steam water-level; sampling error can increase when drum pressure raise; when boiler pressure≤when 6Mpa is following; the sampling error of 0 water level (being the normal operating water level of boiler) is still within the allowed band of regulation; but along with the boiler pressure level is else brought up to UHV (ultra-high voltage); during the subcritical pressure boiler rank; 0 water level sampling error can reach 100mm respectively; 150mm; do not allow for operating provisions; high water stage blowing out value sampling error can reach 200mm respectively; 250mm more can cause serious hysteresis of protection action or protection tripping.Moreover traditional electrode is measured tube sampling water column water quality inferiority, has influence on the accuracy of sensing and the serviceable life of electrode.Therefore, a traditional monotubular straight barrel type measurement boiler drum water level measurement systems technology regulation of having been issued is in the last few years forbidden.
The applicant begins to improve aspect researchs such as a measurement tube sampling water column temperature, improvement sampling water quality, improvement electrode structure in nineteen ninety-five, designed the steam water-level electrode measurement cartridge of various types of high precision, high reliability, not only obtained national patent, the more important thing is the approval that obtained power department and apply.Their great advantage is can be accurately and quality water level in the reliable measurements drum, its measured value and actual water level 10-20mm only on the low side.But the high-acruracy survey tube exists because of high-precision design causes the some shortcomings part that inner structure is comparatively complicated, installation workload is bigger, thereby is more suitable for applying in the measuring system of high-precision requirement.Personnel think in the industry, a kind of structure of necessary research is still simple, I﹠M the most easily and the measuring accuracy steam water-level electrode measurement tube within claimed range still still.
Summary of the invention
In view of the above problems; the invention provides definite method of a kind of single solid bowl type electrode measurement tube in high precision for water level of steam tank and physical dimension thereof; be intended to solve traditional monotubular straight cylinder formula and measure tube and be used for that the measuring error of the above boiler drum level of 10Mpa pressure is big, the problem of sensing poor reliability, make that its measuring accuracy, dynamic responding speed and sensing reliability all can satisfy high pressure, UHV (ultra-high voltage), subcritical boiler drum 0 water level is monitored and the requirement of water level protection of boiler during shutdown period.
Measure the measuring accuracy of tube in order to improve traditional monotubular straight cylinder formula, technical solution of the present invention is as follows:
(1) improves the measuring accuracy of the physical dimension of traditional monotubular straight barrel type electrode measurement tube: promptly dwindle sampling water column casing body surface area, also promptly dwindle it and measure sampling section diameter, make the water column of taking a sample become thin water column with raising measurement tube; Strengthen steam chest cylindrical shell area, also promptly strengthen the diameter and height of the above steam chest of vapour stopple coupon, make the above steam chest of vapour stopple coupon become big steam chest, to measure the long-pending ratio beta of tube water column cylindrical shell and steam chest drum surface satisfied with 0.7 condition as long as make, and just can constitute the thin water column monotubular of the big steam chest electrode measurement tube of multiple version.，
This technical scheme based on: set up sampling gravitational equilibrium equation, provide water level H and sampling error dH in the drum, just can calculate some temperature at the bottom of the sampling water column; From research sampling water column thermal equilibrium condition, set up the water column thermal balance equation and carry out the sampling error quantitative test and learn, at drum pressure, steam water-level, when environment temperature is given value, sampling error is the function of water column cylindrical shell and the long-pending ratio beta of steam chest drum surface, the β value reduces then that sampling error reduces, and the β value increases then that sampling error increases.Conversely, given sampling error then can calculate the β value, after selected sampling section cylindrical shell physical dimension, can determine then that according to the β value that calculates big steam chest drum surface is long-pending, and the selected tube water column drum surface of measuring amasss, and determines the various versions of big steam chest cylindrical shell then.
The physical dimension of single solid bowl type electrode measurement tube in high precision for water level of steam tank of the present invention step is as follows determined:
(1) setting is to the desired value of the sampling error design of drum internal object water level, and according to target value is calculated the long-pending ratio long-pending with the steam chest drum surface of its water column drum surface.Permissible error dH with 0 water level and high water stage protection of boiler during shutdown period definite value water level (belonging to the crucial water level of steam water-level) measurement
oValue, dH
GtValue is as 2 sampling error design object values; According to drum with measure vapour, water gravitational equilibrium equation and the sampling error design object value of tube, calculate some temperature t at the bottom of the pairing sampling water column of desired value
dValue; Make the long-pending F of being of water column drum surface
s, a sampling section vapour column casing body surface area is F
Qc, a surface area of measuring the big steam chest cylindrical shell of tube is F
Qd, the surface area of steam chest cylindrical shell is F
q, F
q=F
Qc+ F
Qd, the surface area ratio β=F of water column cylindrical shell and steam chest cylindrical shell then
s/ F
q, be that research object is set up the heat balance equation group with the sampling water column, solve β=C
p(t
h-t
d) r
-1Ln[(t
h-t
c)/(t
d-t
c)], in the formula: t
hBe the saturation water temperature; t
cBe environment temperature; C
pFor under drum pressure, from t
hTo t
dThe average specific heat at constant pressure of water in the temperature range; R is the latent heat of vaporization of saturation water under the drum pressure; Ln is to be the natural logarithm symbol at the end with e.2 sampling error design object value substitution β calculating formulas are obtained the β value of 2 correspondences.Computing formula implication to β is explained as follows: at C
p, t
h, t
c, when r is definite value, little as given sampling error design object value, just need to improve some temperature value t at the bottom of the water column
d, according to t
d=t
c+ (t
h-t
c)/e
m, need to reduce the exponent m value as can be known; And the m value is proportional to the long-pending F of water column drum surface
s, be inversely proportional to vapour column casing body surface area F
q, promptly exponent m is β=(F
s/ F
q) value the once linear function; Put temperature value t at the bottom of improving water column
d, obviously need to reduce (F
s/ F
q) value, the area of dissipation F of the water column that need reduce to take a sample
sTo reduce the heat dissipation capacity of water column, need to increase vapour column casing body surface area F
qIncrease the heat of input water column to increase steam chest saturated vapor condensing capacity, can improve some temperature at the bottom of the water column, improve the water column medial temperature, can reduce the water column average density, reduce the density difference of the interior saturation water of water column and drum, thereby reduce sampling error.
(2) physical dimension of selected sampling and measuring section cylindrical shell.The sampling and measuring section highly equals vapour side thief hole and the water side thief hole centre distance L (given data of tube is measured in design) on the drum.Determine the outside diameter d of sampling and measuring section cylindrical shell by experience
c, sampling and measuring section cylindrical shell wall thickness is calculated by pressure parts intensity to be determined.The outside diameter d of sampling and measuring section cylindrical shell of the present invention
cBe advisable for 0.45～0.6 times that is traditional monotubular measurement tube diameter.
(3) definite big steam chest cylindrical shell physical dimension of measuring tube.When sampling and measuring section cylindrical shell height and outside diameter d
cAfter having determined, be worth 2 sampling error design objects and get its little value in the pairing β value and calculate the due surface area F of big steam chest cylindrical shell
QdValue.According to F
QdThe big steam chest cylindrical shell of value design is promptly determined its profile, diameter, length.Thereby to meet surface area be F
QdBig steam chest cylindrical shell the design of multiple different geometries and size can be arranged, the connected mode of its big steam chest cylindrical shell and measuring section cylindrical shell also can have various, but is sampling and measuring section barrel diameter d with cylindrical shape, mean outside diameter
c1.7～2.5 times for the most suitable.
(2) improve the installation site of measuring each electrode of tube, to bottom offset, measure the precision of tube with further raising by 1/2 sampling error calculated value.
This technical scheme based on:
Long-pending and the sampling section cylindrical shell for the big steam chest drum surface of having determined; can make its sampling error measure tube less than the single straight tube of tradition significantly; but still have certain sampling error; sampling error can raise with steam water-level and increase; can near or equal error design object value (for example 0 water level target error be 20 millimeters; high water stage protection of boiler during shutdown period definite value target error is 50 millimeters), then be necessary further to improve measuring accuracy.The water level h that takes a sample in the measurement tube always is lower than the interior water level H's of drum, and difference is an error amount, if the mounting points of each level sensor electrode is moved down by 100% margin of error, also just is equivalent to water column rising in the measurement tube, and can make measuring error is 0.But because sampling error is calculated by the drum rated pressure, error reduces with drum pressure and reduces, if, excessive sampling positive error then when low pressure operation, can occur, so the desired value of the electrode assemblie amount of moving down is 1/2 sampling error calculated value by shift electrode under the 100% sampling error calculated value.The sampling error computing method of each measuring point are as follows: the sampling water column casing body when calculating steam water-level H is certain occurrence is long-pending than β=F with the steam chest drum surface
s/ (F
Qd+ F
L-F
s), F
LBe the surface area of whole sampling section cylindrical shell, F
sPressing each measurement point water level value of steam water-level determines; With the sampling water column is to put temperature t at the bottom of research object is set up heat balance equation group derivation calculating water column
d=t
c+ (t
h-t
c)/e
m, in the formula: m=r β/[c
p(t
h-t
c)], calculate water column medial temperature t
CpWith water column average density ρ
CpThe value, calculate sampling error dH=H[1-(ρ '-ρ ") (ρ
Cpn-2-ρ ")
-1].
Beneficial effect of the present invention:
(1) the present invention is in known measuring section cylindrical shell length with set by empirical data under the condition of its barrel dliameter, determine the surface area ratio β of sampling water column casing body and steam chest cylindrical shell by sampling error design object value, the big steam chest drum surface of calculating on the measuring section by the β value is long-pending again, finishes then and measures the tube design.So in using, when steam water-level is the design object water level, because big steam chest cylindrical shell has definite enough surface areas, some temperature and medial temperature are more much higher than traditional monotubular straight cylinder formula measurement tube at the bottom of the sampling water column, and then actual sampling error can reach the design object value.High water stage protection of boiler during shutdown period definite value water level is positioned at the measurement upper limit of steam water-level or near the upper limit, the surface area ratio β maximum of its sampling water column casing body and steam chest cylindrical shell.When steam water-level was lower than the design object water level, the long-pending ratio of its sampling water column casing body and steam chest drum surface must be less than the β value desired value of design cylindrical shell, and then sampling error is less than the design object value.When steam water-level near or when equaling measurement lower limit, sampling error is 0 or near 0.Therefore, the present invention can obviously improve sampling precision.
(2) the present invention again according to sampling error calculated value dH, moves down adjustment with each point electrode measuring point by dH/2 on the basis of improving sampling precision, realizes the compensation of sampling error 1/2.Make the present invention when the long-term high-voltage operation of drum, its accuracy of measurement further meets steam water-level security monitoring and protection of boiler during shutdown period requirement, and when the drum low pressure operation, also can not make and the higher phenomenon of measured value occurs.
(3) because the vapour side neck surface area of steam chest tube surface area ratio of the present invention tradition monotubular straight barrel type measurement tube is much bigger, then enter the steam chest condensing water flow G of water column
nMore much bigger than measuring tube in traditional monotubular straight barrel type, not only accelerated the dynamic responding speed of sampling water column to boiler pressure variation, and the water quality automatic majorization function of sampling water column is strong, water quality is good and stablize, thereby both can prolong blowing period significantly, can alleviate pollution and corrosion again, reduce the slip of electrode, be beneficial to the reliability that prolongs electrode life, improves electrode sensing electrode.
(4) the present invention simple in structure, be easy to make, sampling system is constant, helps the present invention and substitutes the enforcement that traditional monotubular straight barrel type is measured tube, can reduce improved workload.
Description of drawings:
Accompanying drawing 1 is traditional monotubular straight barrel type electrode measurement barrel structure and sampling system synoptic diagram;
Accompanying drawing 2 is the present invention's (first embodiment) structure and sampling system synoptic diagram;
Accompanying drawing 5 is the big steam chest and thin water column cylindrical shell syndeton synoptic diagram of second embodiment of the invention;
Accompanying drawing 6 is that the big steam chest of accompanying drawing 5 is connected J place structure enlarged diagram with thin water column cylindrical shell;
Accompanying drawing 7 is the big steam chest and straight barrel mast junction structural representation of third embodiment of the invention;
Accompanying drawing 11 is the structural representation of fifth embodiment of the invention;
Embodiment:
Now narrate it in conjunction with the accompanying drawings:
Embodiment one:
Accompanying drawing 1,2 clear displaying the present invention measure the identical and different of barrel structure and sampling system with steam water-level tradition monotubular straight cylinder formula.Its something in common: the vapour of drum, the adapter 1,2 of water sampling gaging hole and centre distance L unanimity; Vapour, water sampling are taken over 3a, 4a, 3,4 specifications are identical, and are connected with vapour, water sampling gaging hole on the drum respectively; Vapour, water sampling are taken over centre distance and a carbonated drink sampling section 5a, 5 length all is L; Water sampling is taken over following hydroecium cylindrical shell and is had water end (W.E.) lid 7a, 7, under the water end (W.E.) lid blow-off pipe 8a, 8 is arranged; And all contain electrode assemblie.Institute's difference is: the distance that 3a and end cap 6a are taken in the vapour sampling is little, the steam chest that is constituted only is the little steam chest of manufacturability, and the cylindrical shell that the vapour sampling is taken over more than 3 is the external diameter of the mean outside diameter of the special big steam chest 10 of vertical that is provided with, big steam chest greater than sampling section 5a; The distance of vapour sampling adapter 3 and end cap 6 is greater than the little steam chest height of manufacturability; Big steam chest cylindrical shell area is far longer than manufacturability steam chest cylindrical shell area; Being provided with through-flow splashproof between big steam chest cylindrical shell bottom and the sampling section cylindrical shell takes over; Electrode assemblie 9 is the flexible self-sealed structure electrode assemblies that adopt.The through-flow splashproof of present embodiment is taken over and is reducing oviduct 11, and this reducing oviduct inwall is provided with current-sharing grizzly bar 12, and the grizzly bar lower end is connected with splash-proof canister 13.By Fig. 3, Fig. 4 as seen, current-sharing grizzly bar 12 has round angles such as 4 or 6 to distribute and through-flow splash-proof canister 13 is weldingly connected, through-flow splash-proof canister 13 is positioned at reducing oviduct 11 inside, and the two concentric, through-flow gap is less each other, and current-sharing grizzly bar 12 is welded on the reducing oviduct 11 reducer inwalls.Thereby, as seen from the figure, sampling is taken over 3, is measured the saturated vapor of sampling section 5 through reducing oviduct 11 from vapour, enter big steam chest, the a large amount of condensate water that produce on big steam chest inwall flow to oviduct 11 along big steam chest cylinder inboard wall, through current-sharing grizzly bar 12 equal shunt volumes, boundling strengthen flow velocity, change flow to after, jet arrives the reducing oviduct 11 bottom straight tube inwalls that rebound back behind through-flow splash-proof canister 13 outer walls, descend along sampling section cylindrical shell 5 inwalls, enter the sampling water column.Can prevent electrode extension water like this, improve the sensing reliability; And a large amount of condensate water enters the sampling water column and has improved the water column temperature.And the sampling water column ha of traditional monotubular straight cylinder formula electrode sensor when water level is all H in drum is lower than sampling water column h of the present invention, and sampling error dH promptly of the present invention can be significantly less than the straight formula electrode sensor of traditional monotubular sampling error dHa.
The long-pending ratio of the measurement tube water column cylindrical shell of present embodiment and steam chest drum surface is 0.5; The outside diameter d of measuring section cylindrical shell is 0.5 times that traditional monotubular is measured the tube diameter; Big steam chest cylindrical shell external diameter is 2 times of sampling and measuring section barrel diameter.Present embodiment sampling precision height.
Embodiment two:
As shown in Figure 5, big steam chest is the accumbency shape, and big steam chest cylindrical shell 10 is vertical mutually with the axis of measuring section cylindrical shell 5, is the thin water column electrode measurement tube of the big steam chest of T font.The two ends of big steam chest cylindrical shell 10 are sealed by end cap 14,15.The through-flow splashproof of big steam chest cylindrical shell and measuring section cylindrical shell junction is taken over assembly and is made up of stub (tube) 16, current-sharing water flowing tube 17, logical vapour tube 18.The shoulder dish at current-sharing water flowing tube 17 tops is connected in stub (tube) 16, and the shoulder dish of logical vapour tube 18 bottoms is connected with water flowing tube 17 lower inner wall, the little water holes of current-sharing that radially have a plurality of round angles such as grade to distribute of water flowing tube 17.Saturated vapor from measuring section sampling cylindrical shell enters big steam chest through logical vapour tube 18, and the condensate water that is produced enters in the ring cavity tube that is made of current-sharing water flowing tube 17, logical vapour tube 18, and warp is all penetrated to stub (tube) 16 inwall streams the discharge orifice, flows into the measuring section cylindrical shell along inwall.This embodiment can reduce big steam chest height to greatest extent, is convenient to install, and can effectively prevent electrode extension water.
Embodiment three, and as shown in Figure 7, big steam chest adopts straight barrel type.Big steam chest cylindrical shell 10 tops are sealed by end cap 19.And for example accompanying drawing 8,9, and big steam chest cylindrical shell and the through-flow splashproof adapter assembly of measuring section cylindrical shell junction are that the bottom is connected the end cap 20, end cap 20 inside that have through flow hole and is provided with oviduct 21 and 4 or 8 current-sharing grizzly bars 22.Its through-flow aperture equals sampling section cylindrical shell 5 internal diameters, and current-sharing grizzly bar 22 is by vertical the linking to each other of straight section of waiting round angle with oviduct 21.Saturated vapor from measuring section sampling cylindrical shell 5 enters big steam chest through the through flow hole of end cap 20, the condensate water that is produced flows to end cap 20 inner planes, by the current-sharing of 4 or 8 current-sharing grizzly bars, part current descend along through-flow hole wall, the impelling of another part current changes the direction impelling to through-flow hole wall behind oviduct, enter the measuring section cylindrical shell.This embodiment also can effectively prevent electrode extension water, and is convenient to implement.
Embodiment four, as shown in Figure 10, are provided with fin 23 at big steam chest cylindrical shell 10 outer walls, to reduce big steam chest height.
Embodiment five, and as shown in Figure 11, big steam chest is the lengthening cylindrical shell, and whole measurement tube is single straight barrel type.Vapour side stopple coupon 3 is big steam chest with upper shell, but its surface area must be the surface area that equals above-mentioned big steam chest.This embodiment manufacturing is the simplest.
In addition: need to prove, determine that pan position is all implemented by aforementioned technical solution of the present invention under the method step of measurement tube physical dimension of all embodiment of the present invention and the electrode.
To sum up, the present invention is compared with prior art keeping the simplest structure and the simplest measurement sampling In the time of system, make electric contact point fluviograph sampling and measuring precision meet " heat power plant boiler steam water-level survey Amount systems technology regulation DRZ/T 01-2004 " latest requirement, to the dynamic response of boiler pressure variation more Hurry up.
Claims (10)
1. single solid bowl type electrode measurement tube in high precision for water level of steam tank, comprise sampling section cylindrical shell, steam chest, electrode assemblie, it is characterized in that: improve the physical dimension of measuring tube, it is long-pending promptly to dwindle sampling section drum surface, also promptly dwindle it and measure tube sampling section barrel diameter, make the sampling water column become thin water column; Strengthen steam chest cylindrical shell area, also promptly strengthen the diameter and height of the above steam chest of steam chest stopple coupon, make the above steam chest of vapour stopple coupon become big steam chest, and it measures the long-pending ratio beta of tube sampling section cylindrical shell and big steam chest drum surface less than 0.7.
2. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 1, it is characterized in that: its sampling section cylindrical shell is carefully cylindric, big steam chest is uprightly cylindric, and the external diameter of its sampling section cylindrical shell is 0.45～0.6 times that the single straight tube of tradition is measured tube sampling section cylindrical shell external diameter; Big steam chest cylindrical shell external diameter is 1.7～2.5 times of sampling section cylindrical shell external diameter; Big steam chest cylindrical shell is provided with through-flow splashproof adapter with the junction of sampling section cylindrical shell.
3. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 2, it is characterized in that: described big steam chest is vertical, through-flow splashproof between big steam chest cylindrical shell bottom and the sampling section cylindrical shell is taken over and is reducing oviduct (11), this reducing oviduct inwall is provided with current-sharing grizzly bar (12), and the grizzly bar lower end is connected with splash-proof canister (13).
4. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 2, it is characterized in that: described big steam chest cylindrical shell is the accumbency shape, and big steam chest cylindrical shell bottom and the through-flow splashproof between the sampling section cylindrical shell are taken over by stub (tube) (16) and built-in wherein current-sharing water flowing tube (17), logical vapour tube (18) formation.
5. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 2, it is characterized in that: described big steam chest is vertical, and big steam chest cylindrical shell bottom and the through-flow splashproof between the sampling section cylindrical shell are taken over by the inversion oviduct (21) at end cap (20) and built-in its center and be positioned at current-sharing grizzly bar (22) formation around the oviduct.
6. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 3 is characterized in that: the big steam chest outer wall of described vertical type is provided with radiated rib (23).
7. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 1 is characterized in that: described big steam chest is the lengthening of sampling section cylindrical shell, and big steam chest cylindrical shell external diameter equals the external diameter of the section of sampling cylindrical shell.
8. single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 4, it is characterized in that: described current-sharing water flowing tube (17) top is connected in the shoulder dish that the shoulder dish of stub (tube) (16), logical vapour tube (18) bottom connect current-sharing water flowing tube, current-sharing water flowing tube a plurality of little water holes of current-sharing of waiting round angle to distribute are radially arranged.
9. the physical dimension of single solid bowl type electrode measurement tube in high precision for water level of steam tank is determined method, comprise sampling section cylindrical shell, determining of steam chest physical dimension and determining of electrode assemblie position, it is characterized in that: the determining of (one) sampling section cylindrical shell, steam chest physical dimension: (1) sets the desired value of sampling error design, according to target value physical dimension, (3) of calculating ratio beta, (2) selected sampling section cylindrical shell that its sampling section drum surface is long-pending and the steam chest drum surface the is long-pending steam chest cylindrical shell physical dimension determining to measure tin; (2) determining of electrode assemblie position: (1) calculates the sampling error of each measuring point, mounting points value of moving down of (2) electrode assemblie electrode is 1/2nd of sampling error.
10. the physical dimension of single solid bowl type electrode measurement tube in high precision for water level of steam tank according to claim 9 is determined method, it is characterized in that: the long-pending definite step with the long-pending ratio of steam chest drum surface of (one) sampling section drum surface is: (1) is designed to desired value, (2) with the permissible error of measuring and calculates some temperature t at the bottom of the pairing sampling water column of desired value
dThe heat balance equation group is set up in value, (3), solves the long-pending ratio beta value long-pending with the steam chest drum surface of the pairing sampling section of sampling error design object value drum surface; (2) external diameter of selected sampling section cylindrical shell, making this external diameter is 0.45～0.6 times that the single straight tube of tradition is measured the tube diameter; (3) definite steam chest cylindrical shell physical dimension of measuring tube, the surface area of steam chest cylindrical shell calculates in elder generation, and steam chest cylindrical shell physical dimension can change on profile, diameter, length, but its surface area need be the surface area that is calculated.
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| CNB2006100976194A CN100460833C (en) | 2006-11-15 | 2006-11-15 | Single solid bowl type electrode measurement tube in high precision for water level of steam tank, and method for determining geometrical size |
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| CN201032461Y (en) * | 2006-11-15 | 2008-03-05 | 高维信 | Steam dome water level monotubular type high-precision electrode measuring canister |
-
2006
- 2006-11-15 CN CNB2006100976194A patent/CN100460833C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2163373Y (en) * | 1993-06-25 | 1994-04-27 | 新海发电厂 | Measuring device having preventing error measurement for electrode fluviograph |
| CN2240714Y (en) * | 1995-08-03 | 1996-11-20 | 高维信 | High-precision sampling measure tuble for steam manifold electric contact water level gauge |
| CN2337404Y (en) * | 1998-04-02 | 1999-09-08 | 胡毅 | Electric contact water level measuring drum adapted to any working condition |
| CN2436919Y (en) * | 2000-07-15 | 2001-06-27 | 高维信 | Bubble waterlevel high precision sampling electrode sensor |
| CN1648617A (en) * | 2004-07-09 | 2005-08-03 | 刘立峰 | Electric connection point water level meter of three end type water level meter |
| CN201032461Y (en) * | 2006-11-15 | 2008-03-05 | 高维信 | Steam dome water level monotubular type high-precision electrode measuring canister |
Also Published As
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| CN101004354A (en) | 2007-07-25 |
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