CN220729388U - Liquid level measurement system - Google Patents
Liquid level measurement system Download PDFInfo
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- CN220729388U CN220729388U CN202321092326.2U CN202321092326U CN220729388U CN 220729388 U CN220729388 U CN 220729388U CN 202321092326 U CN202321092326 U CN 202321092326U CN 220729388 U CN220729388 U CN 220729388U
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- water
- liquid level
- delivery valve
- pipe
- measurement system
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- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000005259 measurement Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 128
- 238000001704 evaporation Methods 0.000 claims abstract description 42
- 230000008020 evaporation Effects 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000010977 unit operation Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model provides a liquid level measurement system, which belongs to the technical field of liquid level measurement of power plants and comprises the following components: the evaporation device is used for evaporating saturated water, the bottom of the evaporation device is communicated with the differential pressure transmitter, the top of the evaporation device and the differential pressure transmitter are simultaneously communicated with the balance container, the balance container is used for condensing saturated water vapor, the water inlet of the balance container is provided with a water delivery valve, and the water delivery valve seals the water inlet. Through setting up the water delivery valve in the water injection mouth of balanced container, when the water delivery valve was opened, can be through the water delivery valve direct water injection in to balanced container, need not the instrument and assist, it is simple and convenient to use, and maneuverability is strong to reduce human error, make have sufficient condensate water in the balanced container, make unit start-up initial stage or debugging period liquid level real-time supervision accurate, guarantee the stability and the security of unit operation. The operation convenience is greatly improved, human errors are reduced, and the working efficiency is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of liquid level measurement of power plants, and particularly relates to a liquid level measurement system.
Background
At present, the automation requirements of power plants are higher and higher, and the accuracy of important liquid level measurement is very important. The liquid level measuring points of the pressure vessel of the thermal power plant mainly comprise: the accuracy of the measurement of the steam drum, the deaerator, the water-repellent tank, the high-low pressure tank and the like relates to the stable operation of the whole unit.
When the liquid level of the container is measured, the high water level is mostly measured by adopting a balance container when the temperature difference between the inside and the outside of the container is large or the gas of the medium is easy to condense into liquid, and the liquid level tank is required to be naturally condensed; however, the temperature of low steam adding is low, the liquid level tank is always in a negative pressure state, the condensation effect is poor in the initial starting period or the debugging period of the unit, the real-time monitoring value is inaccurate, and cold water or other liquid is generally injected into the liquid level tank according to the measured medium property before measurement, so that the condensation water quantity in the liquid level tank is enough.
The water injection port above the liquid level tank of the existing liquid level measurement system is sealed through the plug screw thread, and according to the existing maintenance experience, sealing screw water injection is frequently opened, so that the sealing environment of the liquid level measurement system is very easy to damage, human errors are easily caused, the air pressure and the density of the upper part of the liquid level tank are changed, the accuracy of actual liquid level measurement is affected, and the stability and the safety of the operation of unit equipment are affected.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, the utility model proposes a liquid level measurement system comprising: an evaporation device, a differential pressure transmitter and a balance container; the evaporation device is filled with saturated water, the evaporation device is used for evaporating the saturated water, the bottom of the evaporation device is communicated with the differential pressure transmitter, the top of the evaporation device and the differential pressure transmitter are simultaneously communicated with the balance container, the balance container is used for condensing the saturated water vapor, the water inlet of the balance container is provided with a water delivery valve, and the water delivery valve seals the water inlet.
In addition, the liquid level measurement system in the technical scheme provided by the utility model can also have the following additional technical characteristics:
optionally, a dust cover is arranged on the water delivery valve, the dust cover covers the input port of the water delivery valve, and the output port of the water delivery valve is communicated with the water injection port.
Optionally, a mounting tube is arranged on the water filling port and is connected with an output port of the water delivery valve.
Optionally, the installation pipe is embedded into the water filling port, and two ends of the installation pipe are respectively welded with the balance container and the output port of the water delivery valve.
Optionally, the balance container comprises a liquid level tank body, a water injection port is arranged at the top of the liquid level tank body, and a water delivery valve is connected to the water injection port; an upper communicating pipe is arranged on the side wall of the top of the liquid level tank body and is used for communicating the liquid level tank body with the evaporation device; the bottom of the liquid level tank body is provided with a positive pressure pipe, and the positive pressure pipe is used for communicating the liquid level tank body with the differential pressure transmitter.
Optionally, the positive pressure pipe and the upper communicating pipe are welded with the liquid level tank body.
Optionally, a lower communicating pipe is arranged at the bottom of the evaporation device, a negative pressure pipe is arranged on the differential pressure transmitter, and the negative pressure pipe is connected with the lower communicating pipe so that the evaporation device is communicated with the differential pressure transmitter.
Optionally, the upper communicating tube and the lower communicating tube are horizontally disposed.
Optionally, the positive pressure pipe and the negative pressure pipe are vertically arranged.
Optionally, the water delivery valve is a needle valve.
Compared with the prior art, the liquid level measuring system has the beneficial effects that:
through setting up the water delivery valve in the water injection mouth of balance container, when the water delivery valve was opened, can be through the water delivery valve direct water injection in to balance container, need not the instrument and assist, it is simple to use convenient, maneuverability is strong to reduce human error, make have sufficient condensate water in the balance container, ensure that condensate water is sufficient, with make unit start-up initial stage or debugging period liquid level real-time supervision accurate, guarantee the stability and the security of unit operation. The operation convenience is greatly improved, and human errors are reduced. The original processes of removing the sealant, removing the plug, pouring water, smearing the sealant, returning the plug, checking the tightness and the like can be omitted, so that the time and the labor are saved, and the working efficiency is improved. The water injection work can be completed by manually unscrewing the water delivery valve, pouring water and closing the water delivery valve without the assistance of tools such as a spanner, a knife and the like, and the working efficiency is greatly improved.
After the condensed water is injected, the water delivery valve is closed, so that the balance container can be sealed quickly, the excellent isolation performance between the inside and the outside of the balance container can be ensured under the working pressure and the temperature, the pressure in the balance container is prevented from becoming high due to the air from the water injection port, the accuracy of liquid level measurement is ensured, and the reliability of safe and stable operation of equipment is improved.
The dissolved oxygen of the condensed water in the liquid level measurement system is prevented from increasing due to leakage of air, so that serious corrosion of steam and water stopping equipment, a boiler and turbine equipment is prevented under high-temperature and high-pressure operation of a unit, excessive oxidation of a water cooling wall, a superheater, a reheater, a turbine valve and blades of the boiler is avoided, oxide skin is generated, and the service life of the equipment is prolonged.
Avoid the air leak to go into the vacuum environment that influences the condenser, through guaranteeing the leakproofness of balanced container, guarantee the vacuum effect of condenser, guarantee turbine efficiency, reduce the coal consumption, improved the economic nature of unit operation.
Drawings
FIG. 1 is a schematic diagram of a fluid level measurement system according to one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a balance vessel of a level measurement system according to one embodiment of the present utility model;
wherein, the correspondence between the reference numerals and the component names in fig. 1 to 2 is:
10. an evaporation device; 11. a differential pressure transmitter; 12. a balancing container; 121. a liquid level tank body; 122. an upper communicating pipe; 123. a positive pressure tube; 13. a water delivery valve; 14. a dust cover; 15. installing a pipe; 16. a lower communicating pipe; 17. a negative pressure pipe.
Detailed Description
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Referring now to FIGS. 1-2 in combination, a fluid level measurement system, vaporization apparatus 10, differential pressure transmitter 11, and balancing vessel 12, according to an embodiment of the present application; the evaporation device 10 is filled with saturated water, the evaporation device 10 is used for evaporating the saturated water, the bottom of the evaporation device 10 is communicated with the differential pressure transmitter 11, the top of the evaporation device 10 and the differential pressure transmitter are simultaneously communicated with the balance container 12, the balance container 12 is used for condensing the saturated water vapor, the water inlet of the balance container 12 is provided with the water delivery valve 13, and the water delivery valve 13 seals the water inlet. The evaporation device 10 and the balance container 12 are respectively connected to two ends of the differential pressure transmitter, the evaporation device 10, the differential pressure transmitter 11 and the balance container 12 are communicated through a conduit, saturated water is filled in the evaporation device 10, saturated water vapor is generated after the evaporation device 10 heats the saturated water, the saturated water vapor enters the balance container 12 and is condensed into water, the water is accumulated in the conduit and the liquid level tank to form differential pressure, and the differential pressure is converted into an analog signal through the differential pressure transmitter 11. Through setting up water delivery valve 13 in the water injection mouth of balanced container 12, when water delivery valve 13 opened, can be through water delivery valve 13 direct to the water injection in the balanced container 12, need not the instrument and assist, simple to use, maneuverability is strong to reduce human error, make have sufficient condensate in the balanced container 12, ensure the condensate sufficient, in order to make the unit start-up initial stage or the liquid level real-time supervision accuracy in debugging period, guarantee the stability and the security of unit operation. After the condensed water is injected, the water delivery valve 13 is closed, so that the balance container 12 can be sealed quickly, the excellent isolation performance between the inside of the balance container 12 and the outside can be ensured under the working pressure and the temperature, the pressure in the balance container 12 is prevented from becoming high due to the air from the water injection port, the accuracy of liquid level measurement is ensured, and the reliability of safe and stable operation of equipment is improved. The leakage of air also affects the dissolved oxygen of the condensed water in the liquid level measurement system, so that the excessive high dissolved oxygen is avoided under the high-temperature and high-pressure operation of a unit, the serious corrosion of steam and water equipment, a boiler and turbine equipment can be prevented, the excessive oxidation of a water cooling wall, a superheater, a reheater, a turbine valve and blades of the boiler is avoided, oxide skin is generated, and the service life of the equipment is prolonged; the air leakage seriously affects the vacuum environment of the condenser, ensures the vacuum effect of the condenser by ensuring the tightness of the balance container 12, ensures the efficiency of the steam turbine, reduces the coal consumption and improves the economical efficiency of unit operation.
Furthermore, the water delivery valve 13 is closed first and then the water injection pipeline is disconnected, so that air entering the balance container 12 can be further reduced, and the sealing effect of the balance container 12 is improved.
The differential pressure is converted into a standard analog signal of 4-20mA by differential pressure transmitter 11, and the conversion formula is Δp= (ρc- ρs) L- (ρw- ρs) Hg, where: Δp is differential pressure, pa; ρw is the density of saturated water in the evaporator 10, kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρs is the density of saturated vapor in the evaporator 10, kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρc is the density of the condensed water in the balance container 12, kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the g is gravity acceleration, m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the H is the liquid level, m, of the evaporation device 10; l is the source interval, m, of the differential pressure transmitter 11 of the evaporation device 10 on the positive and negative pressure side. The analysis formula shows that the differential pressure Δp measured by the differential pressure transmitter 11 is in a linear relationship with the liquid level H of the evaporation device 10, and the value thereof depends on the accuracy of ρw, ρs, ρc, i.e. the accuracy of the liquid level differential pressure measurement is affected by the upper gas density, pressure in the balance vessel 12 and the condensation water in the balance vessel 12.
The water delivery valve 13 is provided with a dust cover 14, the dust cover 14 covers the input port of the water delivery valve 13, and the output port of the water delivery valve 13 is communicated with the water injection port. Through setting up dust cover 14 in the input port outside, prevent debris and fall into the jam valve, unable complete closure when avoiding the valve to close prevents to leak into the air from the water injection mouth under the negative pressure condition in the balanced container 12, leads to balanced container 12 internal pressure to become high, influences the condition emergence of liquid level measurement accuracy, has guaranteed balanced container 12's leakproofness, has improved the reliability of equipment safe and stable operation.
Further, one end of the dust cover 14 is rotatably connected to the balance container 12, and the other end of the dust cover 14 is clamped with the balance container 12, so that the dust cover 14 can be quickly opened to fill water into the balance container 12, and the use is convenient and efficient.
Specifically, the vaporization vessel employs a heater, and the equalization vessel 12 employs a single-chamber equalization vessel 12.
The water filling port is provided with a mounting pipe 15, and the mounting pipe 15 is connected with an output port of the water delivery valve 13. The water delivery valve 13 is connected to the balance container 12 through the mounting pipe 15, water can be directly injected into the balance container 12 by opening the water delivery valve 13, and the slow manual water injection through the water injection port is replaced, so that the newly injected water is prevented from being pumped away by a negative pressure environment, the convenience of operation is improved, and the debugging period is shortened; the valve is closed immediately after the water is filled, and when the water delivery valve 13 is closed, the tightness can be ensured, the air leakage is avoided, and the accuracy of liquid level measurement is ensured.
The installation tube 15 is embedded into the water filling port, and two ends of the installation tube 15 are respectively welded with the balance container 12 and the output port of the water delivery valve 13. By welding the mounting tube 15 with the balance container 12 and the water delivery valve 13 at the same time, the sealing environment of the liquid level measurement system is ensured so as to maintain the measurement accuracy of the liquid level measurement system.
The balance container 12 comprises a liquid level tank body 121, a water injection port is arranged at the top of the liquid level tank body 121, and a water delivery valve 13 is connected to the water injection port; an upper communicating pipe 122 is arranged on the top side wall of the liquid level tank body 121, and the upper communicating pipe 122 is used for communicating the liquid level tank body 121 with the evaporation device 10; the bottom of the liquid level tank body 121 is provided with a positive pressure pipe 123, and the positive pressure pipe 123 is used for communicating the liquid level tank body 121 with a differential pressure transmitter.
The positive pressure pipe 123 and the upper communication pipe 122 are welded to the liquid level tank body 121. Through making liquid level jar body 121 and last communicating pipe 122 and malleation pipe 123 welded connection to guarantee the leakproofness of liquid level jar body 121, prevent that the air leak from going into and influencing the interior condensate water dissolved oxygen volume of liquid level measurement system, avoid equipment excessive oxidation and corruption, extension liquid level measurement system and equipment's life.
The bottom of the evaporation device 10 is provided with a lower communicating pipe 16, the differential pressure transmitter is provided with a negative pressure pipe 17, and the negative pressure pipe 17 is connected with the lower communicating pipe 16 so that the evaporation device 10 is communicated with the differential pressure transmitter.
Upper communication pipe 122 and lower communication pipe 16 are horizontally disposed. By horizontally disposing upper communication tube 122 and lower communication tube 16, the spacing between upper communication tube 122 and lower communication tube 16 is made uniform. The evaporation device 10 is filled with saturated water, and the lower communication pipe 16 is horizontally arranged, so that the lower communication pipe 16 is parallel to the liquid level in the evaporation device 10, that is, the value of H only changes according to the liquid level in the evaporation device 10, so as to ensure accurate calculation of the pressure difference.
The positive pressure pipe 123 and the negative pressure pipe 17 are vertically disposed. The positive pressure pipe 123 and the negative pressure pipe 17 are vertically arranged at two ends of the differential pressure transmitter respectively, so that pipelines are conveniently arranged to communicate the evaporation device 10 with the balance container 12.
The water feed valve 13 is a needle valve. The needle valve shape can withstand larger pressure than other types of valves, and has better sealing performance for medium with small flow and high pressure.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.
Claims (10)
1. A fluid level measurement system, the fluid level measurement system comprising:
an evaporation device (10), a differential pressure transmitter (11) and a balance container (12); saturated water is filled in the evaporation device (10), the evaporation device (10) is used for evaporating the saturated water, the bottom of the evaporation device (10) is communicated with the differential pressure transmitter (11), the top of the evaporation device (10) and the differential pressure transmitter are simultaneously communicated with the balance container (12), the balance container (12) is used for condensing the saturated water vapor, a water delivery valve (13) is arranged on a water filling port of the balance container (12), and the water delivery valve (13) seals the water filling port.
2. A fluid level measurement system as defined in claim 1, wherein:
the water delivery valve (13) is provided with a dust cover (14), the dust cover (14) covers the input port of the water delivery valve (13), and the output port of the water delivery valve (13) is communicated with the water injection port.
3. A fluid level measurement system as defined in claim 2, wherein:
the water filling port is provided with a mounting pipe (15), and the mounting pipe (15) is connected with an output port of the water conveying valve (13).
4. A fluid level measurement system as defined in claim 3, wherein:
the installation pipe (15) is embedded into the water filling port, and two ends of the installation pipe (15) are respectively connected with the balance container (12) and the output port of the water delivery valve (13) in a welding mode.
5. A fluid level measurement system as defined in claim 1, wherein:
the balance container (12) comprises a liquid level tank body (121), the water injection port is arranged at the top of the liquid level tank body (121), and the water delivery valve (13) is connected to the water injection port; an upper communicating pipe (122) is arranged on the top side wall of the liquid level tank body (121), and the upper communicating pipe (122) is used for communicating the liquid level tank body (121) with the evaporation device (10); the bottom of the liquid level tank body (121) is provided with a positive pressure pipe (123), and the positive pressure pipe (123) is used for communicating the liquid level tank body (121) with the differential pressure transmitter.
6. A fluid level measurement system as defined in claim 5, wherein:
the positive pressure pipe (123) and the upper communicating pipe (122) are connected with the liquid level tank body (121) in a welding mode.
7. A fluid level measurement system as defined in claim 5, wherein:
the bottom of the evaporation device (10) is provided with a lower communicating pipe (16), the differential pressure transmitter is provided with a negative pressure pipe (17), and the negative pressure pipe (17) is connected with the lower communicating pipe (16) so that the evaporation device (10) is communicated with the differential pressure transmitter.
8. A fluid level measurement system as defined in claim 7, wherein:
the upper communication pipe (122) and the lower communication pipe (16) are horizontally disposed.
9. A fluid level measurement system as defined in claim 8, wherein:
the positive pressure pipe (123) and the negative pressure pipe (17) are vertically arranged.
10. A fluid level measurement system according to any one of claims 1 to 9, wherein:
the water delivery valve (13) is a needle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321092326.2U CN220729388U (en) | 2023-05-08 | 2023-05-08 | Liquid level measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321092326.2U CN220729388U (en) | 2023-05-08 | 2023-05-08 | Liquid level measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220729388U true CN220729388U (en) | 2024-04-05 |
Family
ID=90492196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321092326.2U Active CN220729388U (en) | 2023-05-08 | 2023-05-08 | Liquid level measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220729388U (en) |
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2023
- 2023-05-08 CN CN202321092326.2U patent/CN220729388U/en active Active
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