CN104949730A - Temperature compensation type boiler drum liquid level meter - Google Patents
Temperature compensation type boiler drum liquid level meter Download PDFInfo
- Publication number
- CN104949730A CN104949730A CN201410117096.XA CN201410117096A CN104949730A CN 104949730 A CN104949730 A CN 104949730A CN 201410117096 A CN201410117096 A CN 201410117096A CN 104949730 A CN104949730 A CN 104949730A
- Authority
- CN
- China
- Prior art keywords
- gate
- liquid level
- cup
- buoyancy aid
- benchmark
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a temperature compensation type boiler drum liquid level meter and belongs to the field of boiler liquid level measuring equipment. The liquid level meter comprises a condensed water reference cup. The wall of the condensed water reference cup is provided with a notch. A gate which is in up-down sliding connection with the notch is arranged at the notch. The reference cup is internally provided with a floating body. The gate is connected with the floating body through a fixed pulley via a rope. The floating body ascends or descends to drive the gate to descend or ascend to adjust the liquid level of the reference cup. According to the technical scheme, the phenomenon of pressure change caused by density changes of water in the reference cup is changed by adjusting the height of the reference cup; the pressure in the reference cup can be kept constant all the time by slightly adjusting the height of the reference cup through the gate.
Description
Technical field
The present invention relates to a kind of boiler drum liquid-level, particularly a kind of temp. compensation type boiler drum liquid-level, belong to boiler liquid level measuring equipment field.
Background technology
Boiler-steam dome vapour position is a very important monitoring parameter of power plant boiler safe operation, keeps liquid level of steam drum to be normally the necessary condition ensureing safe operation of the boiler.Monitor and adjust the important process that liquid level of steam drum is operations staff, if monitor adjustment not in time, will safe and stable operation be affected.Liquid level is too high, too low all can cause the deterioration of water and steam quality even to cause the accident, and not only affects the economy benefit of enterprise, and forms great threat to equipment safety operation.Monitor that the liquid level of investigation drum must rely on liquid level gauge, boiler runs for a long time under high liquid level, has become the ubiquitous problem of high parameter dum boiler.
Fig. 2 is the structural representation of existing liquid level gauge, in figure, liquid level gauge is a kind of differential pressure type double-chamber balancing vessel liquid level gauge, drum 201 liquid level emasuring device of this liquid level gauge has an annular funnel structure whole double-chamber balancing vessel to be separated into upper and lower two parts above benchmark cup 1, is made up of condensing room 202, benchmark cup 204, overflow chamber 205 and linker 206.Because the saturated vapour in drum 201 constantly dispels the heat condensation in condensing room 202, always liquid level keeps constant in benchmark cup 204, so the water colunm height in forward voltage diode is constant, the water colunm height of negative tube then changes with the change of drum 201 liquid level.
Fig. 3 is the principle schematic of liquid level gauge, and liquid level gauge is that the pressure signal that spread out of by static liquid level and dynamic liquid level are changed the pressure signal spread out of and detect, and at this moment differential pressure can calculate as follows:
Wherein, the density that Hw: drum gravity liquid level, h: the liquid level in benchmark cup one, ρ are the density of water in benchmark cup one, ρ ' is saturation water under drum pressure, ρ " be the density of steam in drum, g is acceleration of gravity.
It can thus be appreciated that: when Hw, ρ, ρ ＇, ρ 〞 is definite value, the differential pressure signal that pressure unit positive and negative pressure intake obtains and liquid level of steam drum be changing into linear relationship, liquid level is higher, and differential pressure value is less, and liquid level is lower, and differential pressure value is larger.Drum pressure is on the impact of steam drum liquid level measurement, due to the variable effect level gauging result of ρ ＇, ρ 〞, and ρ ＇, ρ 〞 and drum pressure have funtcional relationship, therefore the change of drum pressure also will affect the measurement result of differential pressure type level gauge, by Properties of Steam figure or table/(ρ---ρ 〞) (ρ ＇---ρ 〞) has approximate linear relationship with drum pressure P.
As everyone knows, pressure is the long-pending of liquid height, proportion and free acceleration, that is: P=hg ρ, because acceleration of gravity is constant, the height of benchmark cup 1 is also certain, and therefore, pressure and density are proportional relation, and density decides the change of pressure.The signal that the change of pressure exports also changes thereupon, that is, the signal exported and density have proportional relation, and the size of density and the height of temperature have certain relation, when temperature is higher than 4 degrees Celsius, temperature is higher, the density of water will diminish, temperature reduces, the pressure of water raises, that is: the temperature of pressure and water has relation, along with the change of temperature, the pressure that liquid level gauge detects is also in change, the original intention of original this liquid level gauge design is by when highly constant for maintenance, what compared as dynamic liquid level in constant benchmark and linker 206 by the pressure of benchmark cup 1 obtains differential pressure, but, occur that benchmark is not a constant value accurately now, result relatively also just there will be and the actual liquid level problem that there is any discrepancy, that is this liquid level gauge is not foregoing a kind of liquid level gauge that can trust, solution liquid level gauge is acted upon by temperature changes, also be the problem solving boiler safety work, therefore, the error of liquid level gauge is the problem that everybody is concerned about.
Summary of the invention
For temperature variation in boiler, water-mass density is caused to change, variable density causes output signal to change, the inaccurate problem of liquid level data detected by liquid level gauge, the invention provides a kind of temp. compensation type boiler drum liquid-level, its objective is the level sensing out of true problem caused to eliminate Yin Wendu, improving the accuracy of the detection of liquid level gauge.
This invention and technical scheme is, temp. compensation type boiler drum liquid-level, comprise the condensation chamber communicated with drum vapor portion, condensate water benchmark cup is provided with below condensation chamber, described condensate water benchmark wall of cup is provided with breach, described breach is provided with the gate sliding up and down connection along breach, buoyancy aid is provided with in benchmark cup, described gate utilizes a rope body to be connected with buoyancy aid by the fixed pulley be fixedly installed on above benchmark cup, rising or the drive gate that declines of buoyancy aid decline or rise with the liquid level adjusting benchmark cup, the weight of described buoyancy aid is greater than the weight of gate, described condensate water benchmark wall of cup is provided with two breach, described two breach are respectively arranged with the gate sliding up and down connection along breach, described gate utilizes a rope body to be connected with buoyancy aid by fixed pulley, rising or the drive gate that declines of buoyancy aid decline or rise with the liquid level adjusting benchmark cup, the both sides of described condensate water benchmark wall of cup breach are provided with two chutes, described gate locating is between two chutes, described gate edge is provided with pulley, pulley is provided with in described chute, described gate slides up and down along pulley in chute, described buoyancy aid is ball float, described breach is inverted V-shape.
The good effect that this invention can bring is, by condensate water benchmark wall of cup arranges breach, cut height is exactly the liquid level in benchmark cup, breach arranges the gate sliding up and down connection, the lifting of gate on breach can make the liquid level of benchmark cup change, liquid level in benchmark cup is adjusted, for temperature at 20 DEG C, when temperature-resistant, the flashboard of fixed pulley both sides, buoyancy aid is in an equilibrium state, when the temperature increases, the density of water diminishes, conduction due to benchmark cup goes out pressure and water-mass density is in direct ratio, at this moment benchmark cup conducts the pressure signal and can reduce, rising due to temperature causes the density of water to reduce, in order to the buoyancy maintained suffered by buoyancy aid is constant, at this moment just require that the displacement of volume of buoyancy aid increases, namely equilibrium state residing for original fixed pulley two ends flashboard and buoyancy aid can be broken, according to the F=ρ gv principle between buoyancy and buoyancy aid, ρ reduces, constant in order to maintain F, V can increase, namely displacement of volume can increase, the displacement of volume increase of buoyancy aid can only sink to realizing by buoyancy aid, when buoyancy aid is downward, the gate of fixed pulley opposite side is driven to rise, gate rises and can improve the liquid level of benchmark cup, it is in direct ratio that liquid level and benchmark cup conduct the pressure, the pressure that the rising of liquid level can make benchmark cup conduct and increases, be compensate for by the raising of liquid level and conduct the signal that problem less than normal because water-mass density reduces the benchmark cup caused, prevent because water temperature change changes water-mass density change, the pressure change finally caused, this technical scheme, by regulating the height of benchmark cup, change because of the pressure variation phenomenon caused by benchmark water in the cup variable density, the shape of rational design and analysis buoyancy aid, weight, the weight of gate, by water-mass density change automatic lifting gate in this device to regulate the height of benchmark cup liquid level, can make in benchmark cup, to conduct the pressure and remain constant.
On the contrary, when the temperature decreases, the density of water becomes large, conduction due to benchmark cup goes out pressure and water-mass density is in direct ratio, at this moment benchmark cup conducts the pressure signal and can raise, reduction due to temperature causes the density of water to raise, in order to the buoyancy maintained suffered by buoyancy aid is constant, at this moment just require that the displacement of volume of buoyancy aid reduces, namely equilibrium state residing for original fixed pulley two ends flashboard and buoyancy aid can be broken, according to the principle of F=ρ gv between buoyancy and buoyancy aid, the displacement of volume minimizing of buoyancy aid can only be risen by buoyancy aid and be realized, when buoyancy aid rises, the gate of fixed pulley opposite side is driven to decline, gate declines and can reduce the liquid level of benchmark cup, it is in direct ratio that liquid level and benchmark cup conduct the pressure, the pressure that the reduction of liquid level can make benchmark cup conduct and reduces, be compensate for by the reduction of liquid level and conduct the signal that problem bigger than normal because water-mass density improves the benchmark cup caused, prevent because water temperature change changes water-mass density change, the pressure change finally caused, this technical scheme, by regulating the height of benchmark cup, change because of the pressure variation phenomenon caused by benchmark water in the cup variable density, the shape of rational design and analysis buoyancy aid, weight, the weight of gate, by water-mass density change automatic lifting gate in this device to regulate the height of benchmark cup liquid level, can make in benchmark cup, to conduct the pressure and remain constant.Change to changing the pressure signal caused because of water temperature the compensation obtained, meet the original intention of differential pressure type level gauge originally, achieve the object that can detect accurate liquid level.
Accompanying drawing explanation
Fig. 1 appearance schematic diagram of the present invention.
The basic structure schematic diagram of Fig. 2 prior art.
The principle of Fig. 3 prior art illustrates schematic diagram.
Fig. 4 is position of strobe schematic diagram at different temperatures.
Embodiment
Be described with regard to specific embodiment of the invention scheme below with reference to Fig. 1, in figure, 101: benchmark cup, 102: gate, 103: breach, 104: fixed pulley, 106: rope body, 107: bracing frame, 108: liquid level, 109: buoyancy aid.
This invention is provided with breach 103 on condensate water benchmark cup 101 wall, described breach 103 is provided with the gate 102 sliding up and down connection along breach 103, buoyancy aid 109 is provided with in benchmark cup 101, described gate 102 utilizes a rope body 106 to be connected with buoyancy aid 109 by fixed pulley 104, described fixed pulley is arranged on bracing frame 107, the rising of buoyancy aid 109 or the liquid level driving gate 102 to decline or rise to adjust benchmark cup 101 that declines, described condensate water benchmark wall of cup 101 also can be provided with two breach, these two two breach are respectively arranged with to be slided up and down on the gate 102 of connection along breach, described gate 102 utilizes a rope body to be connected with buoyancy aid by fixed pulley, the rising of buoyancy aid or the liquid level driving gate 102 to decline or rise to adjust benchmark cup 101 that declines, the weight of buoyancy aid 109 is greater than the weight of gate 102, the both sides of described condensate water benchmark cup 101 wall of cup breach 103 are provided with two chutes, described gate 102 is arranged between two chutes, described gate 102 edge is provided with fixed pulley 104, pulley is provided with in described chute, described gate 102 slides up and down along pulley in chute, described buoyancy aid is ball float in the present embodiment, the density of described buoyancy aid 109 is less than the density of water, the density of described gate 102 is greater than the density of water, breach is inverted V-shape.
Because the water temperature of boiler is in change, as previously mentioned, in the benchmark cup 101 of the differential pressure levelmeter of water temperature change, the density of water is also in change, pressure due to water is density, the height of water and free acceleration long-pending, that is: P=hg ρ, therefore, the change along with water temperature of benchmark cup 204 in the prior art, density is also in change, the pressure brought is also in change, that is, when water temperature rises, density can diminish, pressure can diminish, the electric signal be transformed in pressure unit just reduces, on the contrary, during water temperature drop, density can become large, pressure can become large, the electric signal be transformed in pressure unit just increases, the differential pressure obtained like this is not just also accurately, liquid level gauge just there will be error.
As can be seen from formula P=hg ρ, want to keep constant pressure must be just that density p is constant, and in fact, by. temperature is ceaselessly changing, it is impossible for keeping density constant, and when variable density, the corresponding height h that changes can obtain constant pressure.The pressure change that altimetric compensation density that is can be utilized to bring.In benchmark cup, the h volume of benchmark cup depends on benchmark cup overflow vent height.As can be seen from formula P=hg ρ, when density is constant, can be compensated the pressure change that temperature causes by the method for adjustment height, just real liquid level can be detected, in the present invention, benchmark cup side is provided with breach 103, the both sides of breach 103 are provided with and can slide up and down gate 102, now, the height of 103 place's gate 102 upper ends is exactly the height of the liquid level 108 in benchmark cup 101, the lifting of gate 102 on breach 103 can make the liquid level in benchmark cup 101 change, liquid level in benchmark cup can be adjusted, for temperature at 20 DEG C, when temperature-resistant, the gate 102 of fixed pulley 104 both sides, buoyancy aid 109 is in an equilibrium state.Breach 103 is made inverted v-shaped, more up, flow is less for gate 102, Liquid level precision will be higher.
Fig. 4 is at different temperatures situation tail gates change in location schematic diagram, wherein, mediate be water temperature at 20 DEG C time liquid level, according to the principle of F=ρ gv between buoyancy and buoyancy aid, when temperature raises (if rising to 30 DEG C), the density of water diminishes, be directly proportional to water-mass density because benchmark cup 101 conducts the pressure, at this moment benchmark cup 101 conducts the pressure signal and can reduce, rising due to temperature causes the density of water to reduce, in order to the buoyancy maintained suffered by buoyancy aid 109 is constant, at this moment just require that the displacement of volume of buoyancy aid 109 increases, namely the equilibrium state between original fixed pulley 104 two ends flashboard 102 and buoyancy aid 109 can be broken, the displacement of volume increase of buoyancy aid 109 can only sink to realizing by buoyancy aid 109, when buoyancy aid 109 is downward, the gate 102 of fixed pulley 104 opposite side is driven to rise, gate 102 rises and can improve the liquid level of benchmark cup 101, liquid level and benchmark cup 101 conduct the pressure and are directly proportional, the pressure that the rising of liquid level can make benchmark cup 101 conduct and increases, be compensate for by the raising of liquid level and conduct the signal that problem less than normal because water-mass density reduces the benchmark cup caused.
On the contrary, when temperature declines (if being reduced to 10 DEG C), the density of water becomes large, be directly proportional to water-mass density because benchmark cup 101 conducts the pressure, at this moment benchmark cup 101 conducts the pressure signal and can raise, reduction due to temperature causes the density of water to raise, according to the principle of F=ρ gv between buoyancy and buoyancy aid, in order to the buoyancy maintained suffered by buoyancy aid 109 is constant, at this moment just require that the displacement of volume of buoyancy aid 109 reduces, namely the equilibrium state between original fixed pulley 104 two ends flashboard 102 and buoyancy aid 109 can be broken, the displacement of volume of buoyancy aid 109 is reduced and can only be realized by buoyancy aid 109 rising, when buoyancy aid 109 upwards time, the gate 102 of fixed pulley 104 opposite side is driven to decline, gate 102 declines and can reduce the liquid level of benchmark cup 101, liquid level and benchmark cup 101 conduct the pressure and are directly proportional, the pressure that the reduction of liquid level can make benchmark cup 101 conduct and reduces, be compensate for by the reduction of liquid level and conduct the signal that problem bigger than normal because water-mass density raises the benchmark cup caused.Signal in pressure unit also just obtains a real signal, meets the design original intention of differential pressure type level gauge originally, achieves when temperature variation, accurately can detect the object of liquid level.
Claims (7)
1. temp. compensation type boiler drum liquid-level, comprise the condensation chamber communicated with drum vapor portion, condensate water benchmark cup is provided with below condensation chamber, it is characterized in that: described condensate water benchmark wall of cup is provided with breach, described breach is provided with the gate sliding up and down connection along breach, buoyancy aid is provided with in benchmark cup, described gate utilizes a rope body to be connected with buoyancy aid by the fixed pulley be fixedly installed on above benchmark cup, rising or the drive gate that declines of buoyancy aid decline or rise with the liquid level adjusting benchmark cup, and the weight of described buoyancy aid is greater than the weight of gate.
2. temp. compensation type boiler drum liquid-level according to claim 1, it is characterized in that: described condensate water benchmark wall of cup is provided with two breach, described two breach are respectively arranged with the gate sliding up and down connection along breach, described gate utilizes a rope body to be connected with buoyancy aid by fixed pulley, and rising or the drive gate that declines of buoyancy aid decline or rise with the liquid level adjusting benchmark cup.
3. temp. compensation type boiler drum liquid-level according to claim 1, is characterized in that: the both sides of described condensate water benchmark wall of cup breach are provided with two chutes, and described gate locating is between two chutes.
4. temp. compensation type boiler drum liquid-level according to claim 1, is characterized in that: described gate edge is provided with pulley.
5. temp. compensation type boiler drum liquid-level according to claim 1, it is characterized in that: be provided with pulley in described chute, described gate slides up and down along pulley in chute.
6. temp. compensation type boiler drum liquid-level according to claim 1, is characterized in that: described buoyancy aid is ball float.
7. temp. compensation type boiler drum liquid-level according to claim 1, is characterized in that: described breach is inverted V-shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410117096.XA CN104949730B (en) | 2014-03-27 | 2014-03-27 | Temperature compensation type boiler drum liquid-level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410117096.XA CN104949730B (en) | 2014-03-27 | 2014-03-27 | Temperature compensation type boiler drum liquid-level |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104949730A true CN104949730A (en) | 2015-09-30 |
| CN104949730B CN104949730B (en) | 2018-03-23 |
Family
ID=54164569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410117096.XA Expired - Fee Related CN104949730B (en) | 2014-03-27 | 2014-03-27 | Temperature compensation type boiler drum liquid-level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104949730B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525295A (en) * | 2020-11-03 | 2021-03-19 | 福建福清核电有限公司 | Stable temperature compensation measurement method for guided wave radar liquid level meter |
| CN113295242A (en) * | 2021-04-23 | 2021-08-24 | 杭州海芯达科技有限公司 | Boiler full-temperature constant standard liquid level measurement method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60149925A (en) * | 1984-01-17 | 1985-08-07 | Mizu Kanri Kogaku Kenkyusho:Kk | Negative pressure type liquid level measuring method |
| CN2220585Y (en) * | 1995-05-12 | 1996-02-21 | 李福乐 | closed indirect cooling steam boiler |
| CN102564534A (en) * | 2012-01-08 | 2012-07-11 | 秦皇岛华电测控设备有限公司 | Magnetic liquidometer for water level of steam drum |
| CN202835325U (en) * | 2012-09-21 | 2013-03-27 | 西林钢铁集团有限公司 | Improved type automatic water filling equalizing container of type boiler |
| CN203824612U (en) * | 2014-03-27 | 2014-09-10 | 大唐安阳发电厂 | Temperature compensation type boiler drum liquidometer |
-
2014
- 2014-03-27 CN CN201410117096.XA patent/CN104949730B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60149925A (en) * | 1984-01-17 | 1985-08-07 | Mizu Kanri Kogaku Kenkyusho:Kk | Negative pressure type liquid level measuring method |
| CN2220585Y (en) * | 1995-05-12 | 1996-02-21 | 李福乐 | closed indirect cooling steam boiler |
| CN102564534A (en) * | 2012-01-08 | 2012-07-11 | 秦皇岛华电测控设备有限公司 | Magnetic liquidometer for water level of steam drum |
| CN202835325U (en) * | 2012-09-21 | 2013-03-27 | 西林钢铁集团有限公司 | Improved type automatic water filling equalizing container of type boiler |
| CN203824612U (en) * | 2014-03-27 | 2014-09-10 | 大唐安阳发电厂 | Temperature compensation type boiler drum liquidometer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525295A (en) * | 2020-11-03 | 2021-03-19 | 福建福清核电有限公司 | Stable temperature compensation measurement method for guided wave radar liquid level meter |
| CN113295242A (en) * | 2021-04-23 | 2021-08-24 | 杭州海芯达科技有限公司 | Boiler full-temperature constant standard liquid level measurement method |
| CN113295242B (en) * | 2021-04-23 | 2024-03-19 | 杭州海芯达科技有限公司 | Method for measuring total-temperature constant standard liquid level of boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104949730B (en) | 2018-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203824612U (en) | Temperature compensation type boiler drum liquidometer | |
| CN104976988B (en) | Tunnel large-elevation-difference sedimentation measurement system | |
| CN208043593U (en) | Liquid density measurement device | |
| CN106940215B (en) | Intelligent compensation built-in drum liquid level measuring device | |
| CN105865974A (en) | Method for determining density of cotton through water drainage technology | |
| CN104949730A (en) | Temperature compensation type boiler drum liquid level meter | |
| US1800532A (en) | Hydrometer for liquids | |
| CN102590269A (en) | Device for measuring thermal conductivity of vacuum glass | |
| CN106352942A (en) | Liquid level measurement device and liquid level measurement method based on double differential pressure transmitters | |
| US2714819A (en) | Multitube average velocity manometer | |
| CN203929169U (en) | A kind of accurate measuring systems for gasification furnace shock chamber liquid level | |
| CN202421012U (en) | Single float rod type density measurement floater based on magnetostriction liquid level meter | |
| CN107300512A (en) | Intelligent densitometer | |
| US2106966A (en) | Gas gravitometer | |
| CN209927663U (en) | Density sensor high-low temperature experimental device | |
| US1604387A (en) | Machine for measuring the specific gravity of a liquid | |
| RU2533745C1 (en) | Dialling and calibration method of gas flow meter, and device for its implementation | |
| US1393942A (en) | Vapor-tension-measuring apparatus | |
| CN207096032U (en) | Intelligent densitometer | |
| CN206488998U (en) | A kind of pulley measuring device for being used to measure the change of triaxial test body | |
| US2328460A (en) | Density measuring apparatus | |
| CN205374300U (en) | Accurate temperature control's index of refraction survey device | |
| CN110286089A (en) | A kind of online water quality measuring instrument of included fluid homeostasis | |
| US2312106A (en) | Hydrometer | |
| CN209689529U (en) | A kind of drainage pipeline device for measuring elevation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180323 Termination date: 20190327 |