CN201094065Y - Evacuation type pressure difference water gauge - Google Patents
Evacuation type pressure difference water gauge Download PDFInfo
- Publication number
- CN201094065Y CN201094065Y CNU2007202001057U CN200720200105U CN201094065Y CN 201094065 Y CN201094065 Y CN 201094065Y CN U2007202001057 U CNU2007202001057 U CN U2007202001057U CN 200720200105 U CN200720200105 U CN 200720200105U CN 201094065 Y CN201094065 Y CN 201094065Y
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- China
- Prior art keywords
- boiler
- water
- steam
- condensation pot
- drum
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model discloses a boiler barrel water-level measurement device, i.e. an emptying differential pressure water level gauge. A small hole is arranged at the top of a condensation pot of the water-level gauge with a sloping exhaust tube by which steam side space in the condensation pot and a steam tube at the top of the boiler or other steam side space of the boiler system is communicated through the small hole, therefore, air accumulated in the condensation pot is delivered to the steam side space of the boiler system through the small hole and the exhaust tube when water is charged into the condensation pot from the boiler barrel to ensure that the charging of water to form a liquid column reference can be conducted once before the boiler is started. The positive effects the differential pressure water level gauge brings about are shortened startup time of the boiler and economic use of demineralized water, for the charging of water into the condensation pot to form the liquid column reference can be done in one procedure before the boiler is started, and assured measurement accuracy, because the static pressure fluctuation of saturated steam and disturbance of steam flow on reference level are restricted to a permitted range due to the throttling function of the small hole even if saturated steam fluids through the condensation pot when the boiler works normally.
Description
Affiliated technical field the utility model relates to a kind of device of measuring the boiler drum middle water level, particularly this device is when boiler water filling starts and work, the air that its inside can be accumulated is in time drained, the precision that guaranteed water level is measured, and the number of times that before boiler startup measurement mechanism is carried out water-filling calibration can once be finished, and shortens the time of boiler startup.
Background technology
At present, the needs when boiler is worked of the water level in subcritical Natural Circulation (the comprising forced circulation) boiler drum are measured in real time, and differential pressure water level gauge is a device of realizing that level measuring generally adopts.Its principle that realizes level measuring is, with coagulation tank that the vapour side space of drum is connected in form a highly constant fluid column, and the difference in height of the actual water level in the drum and benchmark fluid column is realized measurement to actual water level by differential pressure transmitter formation electric signal as benchmark.Benchmark water column in the coagulation tank before boiler startup by drum water filling and forming in it; And when boiler is worked, enter into saturated vapour in the coagulation tank from drum and constantly condense and keep and stablize constant benchmark fluid column, unnecessary condensate water is got back in the drum by the communicating pipe with gradient again.The problem that this differential pressure type level measurement device that generally adopts at present highlights is, before boiler startup during water-filling, because the gradient of vapour side communicating pipe and the design feature of coagulation tank, the air that accumulate its inside is difficult for discharging and the formation vent plug, sometimes can not form the water colunm height of requirement, cause to level measuring than mistake.Therefore, need carry out repeatedly the water filling of coagulation tank before starting, till forming the liquid-column height that requires.
Summary of the invention
For solving the air queueing problem in the differential pressure water level gauge coagulation tank, the utility model provides a kind of differential pressure water level gauge, can continuously the air in the coagulation tank be drained.
The method of getting rid of air in the coagulation tank is to offer an aperture at the top of jar, and sets up a gas outlet with gradient, is connected with the steam guiding tube at drum top.The air that accumulates in the coagulation tank just can pass through aperture during water filling at drum in it like this, gas outlet imports in the vapour side space of steam generator system, guarantees that the coagulation tank water filling being formed the benchmark fluid column before the boiler startup can once finish.Boiler when normal operation since coagulation tank communicating pipe from the leading point of drum and gas outlet pick out a little between have pressure reduction, must have saturated vapour to pass through at communicating pipe, coagulation tank and gas outlet.Because the diameter of aperture is according to the structure of drum and coagulation tank and connecting line thereof and defines under the prerequisite of steam flow velocity in coagulation tank and design, so the differential static pressure low amplitude of saturated vapour can be limited within the error range of permission in the coagulation tank.Be that aperture has the throttling action to saturated steam flowing.Aperture from the vent port at coagulation tank top to throttling action the gas outlet leading point can be provided with more than one according to the structure of concrete drum and differential pressure water level gauge.
The beneficial effect that the utility model produces is, can once finish during to the coagulation tank water filling before the boiler startup, shortens the time of boiler startup and saves demineralized water; Though have saturated vapour to flow through in the coagulation tank during normal operation of boiler but because the throttling action of aperture makes static pressure in the coagulation tank change and steam flow is limited within the error range of permission the precision of guaranteed water level measurement to the disturbance of reference level.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a structural drawing of the present utility model.
Fig. 2 is the longitudinal diagram of coagulation tank.
1. communicating pipes among Fig. 1,2. coagulation tank, 3. gas outlet, 4. drum, 5. drum saturated vapour delivery line, the 6. connecting pipe of drum and differential pressure transmitter, the 7. connecting pipe of coagulation tank and differential pressure transmitter.
Among Fig. 2 1. with drum communicating pipe, 2. exhaust (throttling) hole, 3. gas outlet, the 4. connecting pipe of coagulation tank and differential pressure transmitter.
Embodiment
Among Fig. 1, pass through drum (4) before the boiler startup to coagulation tank (2) water filling, the water level in drum this moment (4) must be higher than the datum level that will form.The air that accumulates in the coagulation tank (2) imports in the drum steam guiding tube (5) (the vapour side space of steam generator system) by the aperture and the gas outlet (3) of tank top.Water level in the drum (4) falls back to communicating pipe (1) with the interface A point of drum (4) when following, and the water body that exceeds datum level in the coagulation tank (2) promptly flows back within the drum (4) by the communicating pipe (1) that has the gradient, datum level formation thereupon.Air in coagulation tank during water filling (2) can in time not got rid of can form vent plug, once can finish so water filling forms the operation of datum level, shortens the time of boiler startup and can save stove water.Drum (4) is connected with differential pressure transmitter with (7) by connecting pipe (6) with coagulation tank (2), the amplitude of the electric signal (milliampere) of differential pressure transmitter output is corresponding with the difference in height of datum level and the tested water level of drum (4), thereby realizes the measurement to drum (4) water level.
During boiler work, saturated vapour flows out continuously from steam guiding tube, the flow of saturated vapour also changes thereupon during load variations, there is the pressure reduction that changes with boiler load between the junction A point of communicating pipe and drum and the junction B point of gas outlet and steam guiding tube, so the saturated vapour in the drum flows through by communicating pipe, coagulation tank and gas outlet from the A point.Because the throttling action of aperture (Fig. 2 .2) is limited to below the certain numerical value steam flow rate in the coagulation tank, the amplitude that the steam static pressure reduces in the coagulation tank is less, and saturated steam flowing is also less to the disturbance of reference level, can not produce the error that exceeds permission.The outer surface of coagulation tank does not lay heat-insulation layer, contacts with atmosphere, makes it to produce the heat radiation to atmosphere, thus coagulation tank in saturated vapour can constantly condense into saturation water, unnecessary water body is by flow back within the drum communicating pipe, datum level is maintained.
Claims (2)
1. the emptying type differential pressure water level gauge of a boiler drum level measuring has connected gas exhaust piping at the top of coagulation tank between the vapour side space of drum steam guiding tube or other steam generator system, it is characterized in that being provided with on the exhaust channel aperture with throttling action.
2. emptying type differential pressure water level gauge according to claim 1 is characterized in that: on the exhaust channel optional position aperture that one or more have throttling action can be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202001057U CN201094065Y (en) | 2007-02-28 | 2007-02-28 | Evacuation type pressure difference water gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202001057U CN201094065Y (en) | 2007-02-28 | 2007-02-28 | Evacuation type pressure difference water gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201094065Y true CN201094065Y (en) | 2008-07-30 |
Family
ID=39902034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007202001057U Expired - Fee Related CN201094065Y (en) | 2007-02-28 | 2007-02-28 | Evacuation type pressure difference water gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201094065Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405923A (en) * | 2018-11-06 | 2019-03-01 | 秦皇岛华电测控设备有限公司 | The built-in equalizing reservoir of steam water-level full scale |
-
2007
- 2007-02-28 CN CNU2007202001057U patent/CN201094065Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405923A (en) * | 2018-11-06 | 2019-03-01 | 秦皇岛华电测控设备有限公司 | The built-in equalizing reservoir of steam water-level full scale |
| CN109405923B (en) * | 2018-11-06 | 2023-11-03 | 秦皇岛华电测控设备有限公司 | Full range internal balance container for drum water level |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080730 |