CN101986108A - Differential pressure type liquid level measurement device for pressure container - Google Patents
Differential pressure type liquid level measurement device for pressure container Download PDFInfo
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- CN101986108A CN101986108A CN 201010285523 CN201010285523A CN101986108A CN 101986108 A CN101986108 A CN 101986108A CN 201010285523 CN201010285523 CN 201010285523 CN 201010285523 A CN201010285523 A CN 201010285523A CN 101986108 A CN101986108 A CN 101986108A
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- voltage diode
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- 239000007788 liquid Substances 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008016 vaporization Effects 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract 3
- 230000005587 bubbling Effects 0.000 abstract 1
- 238000000691 measurement method Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a differential pressure type liquid level measurement device for a pressure container, and relates to liquid level measurement technology of the pressure container. The device comprises a steam lead-out pipe, a saturated water lead-out pipe, a positive pressure pipe and a differential pressure transmitter, wherein the steam lead-out pipe is directly connected with the positive pressure pipe and an isolating valve is arranged on the steam lead-out pipe; the positive pressure pipe is arranged in an outer constant-temperature sleeve in which constant-temperature fluid is held; the top end of the positive pressure pipe is provided with a water injection valve; the saturated water lead-out pipe and a negative pressure pipe are combined into a whole and horizontally arranged at a zero position at the horizontal level of a high-pressure container; and the differential pressure transmitter is arranged on the saturated water lead-out pipe which is connected with the positive pressure pipe through the differential pressure transmitter. The device effectively overcomes the disadvantages of indefinite density and liquid level caused by bubbling, vaporizing and the like of water in the positive pressure pipe and measurement error caused by the mounting position of the differential pressure transmitter in a single-chamber balance container method and a double-chamber balance container method, and has obvious characteristics of high measurement accuracy, convenience of use and low manufacturing cost.
Description
Technical field
The present invention relates to a kind of differential pressure type liquid level emasuring device, relate in particular to a kind of differential pressure type level gauging technology of drum equal pressure container.
Background technology
The most frequently used method has two kinds in the drum equal pressure container level measuring at present, and a kind of is the single-compartment balance container method, and another kind is two chambers equalizing reservoir methods.
Fig. 1 is the signal of single-compartment balance container drum level measurement method principle.Drum 1 internal upper part is an air space, and being full of density is ρ
sSaturated vapour; The bottom is that density is ρ
wThe space of saturation water, steam water-level is H.There is a steam fairlead 2 to link to each other at drum top air space with equalizing reservoir 3.Two piezometric tube are arranged at the equalizing reservoir bottom, and one is forward voltage diode 4, connect the malleation side of differential pressure transmitter 6; Another root is a negative pressure pipe 5, connects the suction side of differential pressure transmitter, and the negative pressure pipe also is connected with drum saturation water fairlead 7 simultaneously, and the horizontal absolute altitude of saturation water fairlead also is the zero point of steam water-level.Steam in the drum condenses into density by equalizing reservoir in forward voltage diode be ρ
cWater, the pressure of water generates acts on the differential pressure transmitter in the forward voltage diode, as the malleation reference end of differential pressure transmitter.Top in the negative pressure pipe is steam, and the bottom is a water, and the pressure in the negative pressure pipe is as the negative pressure reference end of differential pressure transmitter.There are certain functional relation in the pressure difference Δ p and the steam water-level height H of the malleation reference end of differential pressure transmitter and negative pressure reference end, differential pressure transmitter converts pressure difference Δ p to the 4-20mA electric signal and exports to computing machine, calculates steam water-level height H value by computing machine according to certain functional relation.According to physics principle, the differential pressure value Δ p calculating formula that can draw differential pressure transmitter output is:
Δp＝p+-p-＝L(ρ
c-ρ
s)g-H(ρ
w-ρ
s)g
Or be rewritten as:
L in the formula is steam fairlead 2 and saturation water fairlead 7 horizontal level height difference, also is the range of level measuring.This shows: the differential pressure value Δ p of steam water-level H and differential pressure transmitter output has a linear corresponding relation, and this relation is subjected to ρ
w, ρ
sAnd ρ
cInfluence.ρ
wAnd ρ
sBy the pressure decision of drum, in case pressure has been decided ρ
wAnd ρ
sNumerical value is definite value.In the boiler computer control system DCS of reality system, the computing function of utilizing computing machine is from the relation influence of normal moveout correction pressure to steam water-level H and differential pressure value Δ p, but ρ
cBe one and be subjected to environment temperature, the numerical value of multifactor impacts such as vapor (steam) temperature and tube wall insulation, single-compartment balance container drum level measurement method is not considered ρ
cThe influence that changes.
In order to overcome the deficiency that the single-compartment balance container method is measured, two chambers equalizing reservoir method has appearred, and its drum level measurement method principle is as schematically shown in Figure 2.Equalizing reservoir inner room 8 connects forward voltage diode 4, in the pipe is the saturation water of steam condensation, equalizing reservoir mistress 9 is by the steam outlet of drum top air space steam fairlead and mistress bottom, make steam be full of the mistress and continuously outflow, its objective is heating inner room and the forward voltage diode that is attached thereto, make water wherein remain on state of saturation.According to physics principle, can draw the differential pressure value Δ p corresponding relation of steam water-level H and differential pressure transmitter output equally:
From then on formula as can be seen, H---Δ p corresponding relation only is subjected to ρ
wAnd ρ
sInfluence, and ρ
wAnd ρ
sBy the decision of the pressure of drum, can be well in the DCS system automatically calibrating (base measuring) pressure to H---the influence of Δ p relation, therefore two chambers equalizing reservoir method has solved the defective in the single-compartment balance container drum level measurement method.
But also there are many deficiencies in two chambers equalizing reservoir method: 1. during boiler startup, can't condense into comparing water column in the differential pressure water level gauge equalizing reservoir, need to adopt manually to equalizing reservoir inner room and outer indoor water filling, its water-filling method complexity.2. often occur steam bubble in the forward voltage diode, even the upper chamber portion water level can not be full of, reason is that water is in state of saturation, when vapour pressure changes, is easy to occur self vaporization boiling, influences the forward voltage diode internal pressure and this will be very big, causes the error to level measuring.3. for the water in the forward voltage diode that guarantees inner room and be attached thereto remains on state of saturation, enough spaces must be arranged the mistress so that the Steam Heating inner room, and outer chamber size is big more, and its manufacturing cost is high more.Because the mistress links to each other with drum, the mistress is a pressure vessel.4. the position of differential pressure transmitter is installed in the horizontal absolute altitude of drum below zero point, benefit is that the installation site degree of freedom is big, convenient, but the problem of bringing is also very outstanding: the horizontal absolute altitude of drum zero point, following forward voltage diode was necessary the same with the characteristics such as density of water in the negative pressure pipe, otherwise can bring measuring error.In the actual engineering, because the insulation situation of service condition and two tubes can not be in full accord, measuring error can't be avoided.
Summary of the invention
Deficiency and defective at single-compartment balance container mensuration that uses in the present prior art and the equalizing reservoir mensuration existence of two chambers, the purpose of this invention is to provide a kind of differential pressure type liquid level emasuring device that is used for pressure vessel, make it on measuring accuracy, easy to use and manufacturing cost, be better than prior art.
The objective of the invention is to be achieved through the following technical solutions:
A kind of differential pressure type liquid level emasuring device that is used for pressure vessel, this device comprises steam fairlead, saturation water fairlead, forward voltage diode, negative pressure pipe and differential pressure transmitter, it is characterized in that: described steam fairlead directly links to each other with forward voltage diode, and on the steam fairlead isolation valve is installed; Described forward voltage diode is arranged in the constant temperature outer tube that constant temperature fluid is housed, and the top of forward voltage diode is equipped with water injection valve; Described saturation water fairlead and negative pressure pipe unite two into one, and are installed in the null position of the horizontal absolute altitude of high pressure vessel, and horizontally disposed; Described differential pressure transmitter is installed on the saturation water fairlead, and the logical differential pressure transmitter of saturation water fairlead is connected with described forward voltage diode.
In the technique scheme, described constant temperature fluid adopts thermostatted water.
The present invention has technology to compare, and has the following advantages and the high-lighting effect: 1. need not whether consider boiler operatiopn, can give water filling in the forward voltage diode very easily, guarantee liquid level in the forward voltage diode.2. overcome in the prior art since in the forward voltage diode water self be stressed and change the steam bubble that occurs and vaporization etc. and cause density and liquid level uncertain, and then cause the defective of measuring error.3. equalizing reservoir of the prior art is a pressure-containing member, and volume is bigger, needs thick-wall materials to bear high temperature, high pressure, the manufacturing cost height.The present invention has cancelled equalizing reservoir, and the constant temperature fluid in the outer tube is normal temperature, low pressure, and outer tube need not to consider to bear high temperature, high pressure, and manufacturing cost is more much lower than prior art.4. the measuring error of having avoided the installation site of differential pressure transmitter to cause.
In a word, the present invention overcomes the problem that has effectively overcome existing single-compartment balance container method and the equalizing reservoir method existence of two chambers, has tangible technical progress on measuring accuracy and easy to use and manufacturing cost.
Description of drawings
Fig. 1 is the theory structure synoptic diagram of single-compartment balance container drum level measurement device.
Fig. 2 is the theory structure synoptic diagram of two chambers equalizing reservoir drum level measurement device.
Fig. 3 is the theory structure synoptic diagram of a kind of differential pressure type liquid level emasuring device of the present invention.
Among the figure: the 1-drum; 2-steam fairlead; The 3-equalizing reservoir; The 4-forward voltage diode; 5-negative pressure pipe; The 6-differential pressure transmitter; 7-saturation water fairlead; 8-equalizing reservoir inner room; 9-equalizing reservoir mistress; The 10-isolation valve; The 11-water injection valve; 12-constant temperature outer tube.
Embodiment
Below in conjunction with accompanying drawing concrete structure of the present invention, principle and the course of work are described further.
Fig. 3 is a differential pressure type liquid level emasuring device principle schematic provided by the invention, this device comprises steam fairlead 2, saturation water fairlead 7, forward voltage diode 4 and differential pressure transmitter 6, it is characterized in that: described steam fairlead directly links to each other with forward voltage diode 4, and on the steam fairlead isolation valve 10 is installed; Described forward voltage diode is arranged in the constant temperature outer tube 12 that constant temperature fluid is housed, and the top of forward voltage diode is equipped with water injection valve 11; Described saturation water fairlead and negative pressure pipe unite two into one, and are installed in the null position of the horizontal absolute altitude of high pressure vessel, and horizontally disposed; Described differential pressure transmitter is installed on the saturation water fairlead, and the logical differential pressure transmitter of saturation water fairlead is connected with described forward voltage diode.
Principle of work of the present invention is as follows: no matter whether pressure vessel works, close isolation valve 10 and promptly disconnected being connected of forward voltage diode and pressure vessel, open water injection valve 11 forward voltage diode 4 interior water fillings in the past, when water filling is too much, after opening isolation valve 10, unnecessary water can be back to pressure vessel, therefore the liquid level in the forward voltage diode can finely keep, water injection valve also can be treated as air release in addition, steam bubble in the forward voltage diode can diffuse by water injection valve, can well guarantee that like this pressure of the water column in the forward voltage diode is accurate.In the constant temperature outer tube 12 constant temperature fluid is housed, constant temperature fluid can be thermostatted water or other isothermal liquids, the constant temperature fluid of turnover constant temperature outer tube 12 is for guaranteeing the temperature constant of malleation liquid in pipe, this steady temperature should be lower than the saturation temperature certain numerical value of reservoir pressure correspondence, when preventing that reservoir pressure from changing, cause steam bubble and vaporization in the forward voltage diode.In northern China winter, occur sometimes in the forward voltage diode in the single-compartment balance container method freezing, phenomenons such as forward voltage diode water vapor when reservoir pressure is low, can occur and add electrically heated forward voltage diode, can not guarantee water level and density in the forward voltage diode, and then cause measuring error.The thermostatted water of constant temperature outer tube 12 is equivalent to heat the malleation liquid in pipe in the winter time, is equivalent to cool off liquid in the forward voltage diode in summer, in a word, guarantees that fluid density and liquid level are not subjected to environmental change in the forward voltage diode, makes it constant.Differential pressure transmitter is installed in pressure vessel zero water level absolute altitude position, also promptly corresponding negative pressure pipe and pressure vessel saturation water fairlead unite two into one, horizontally disposed, so the physical parameters such as density of the interior water of negative pressure pipe do not influence the negative pressure reference terminal number value of differential pressure transmitter.Influence the interior density p of forward voltage diode of the malleation reference terminal number value of differential pressure transmitter
cBecause constant temperature and be lower than saturation temperature and be almost definite value, so malleation reference terminal number value measuring error is very little in L length, and L is steam fairlead and saturation water fairlead horizontal level height difference, also is the range of level measuring.
Parameter is according to physics principle, the differential pressure value Δ p corresponding relation of pressure vessel water level H and differential pressure transmitter output:
ρ wherein
cBe density of liquid in the forward voltage diode, ρ
cPassed in and out thermostatted water temperature effect,, can be proofreaied and correct it easily H according to turnover thermostatted water temperature---the influence of Δ p relation, the ρ in the same formula
wAnd ρ
sCan use pressure correction, so measuring accuracy is more more reliable than prior art.
In addition, constant temperature outer tube 12 need not consider to bear high temperature, high pressure for cooling or heating malleation liquid in pipe usefulness, and manufacturing cost is more much lower than the equalizing reservoir of pressure-containing member of the prior art.
The present invention compared with prior art overcomes the problem that existing single-compartment balance container method and two chambers equalizing reservoir method exist, and is better than prior art in certainty of measurement and easy to use and manufacturing cost.
Claims (2)
1. differential pressure type liquid level emasuring device that is used for pressure vessel, this device comprises steam fairlead (2), saturation water fairlead (7), forward voltage diode (4), negative pressure pipe and differential pressure transmitter (6), it is characterized in that: described steam fairlead directly links to each other with forward voltage diode (4), and isolation valve (10) is installed on the steam fairlead; Described forward voltage diode is arranged in the constant temperature outer tube (12) that constant temperature fluid is housed, and the top of forward voltage diode is equipped with water injection valve (11); Described saturation water fairlead and negative pressure pipe unite two into one, and this pipe is installed in the position of high pressure vessel zero water level absolute altitude, and horizontally disposed; Described differential pressure transmitter is installed on the saturation water fairlead, and the logical differential pressure transmitter of saturation water fairlead is connected with described forward voltage diode.
2. according to the described differential pressure type liquid level emasuring device of claim 1, it is characterized in that: described constant temperature fluid adopts thermostatted water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010285523 CN101986108B (en) | 2010-09-16 | 2010-09-16 | Differential pressure type liquid level measurement device for pressure container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010285523 CN101986108B (en) | 2010-09-16 | 2010-09-16 | Differential pressure type liquid level measurement device for pressure container |
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| Publication Number | Publication Date |
|---|---|
| CN101986108A true CN101986108A (en) | 2011-03-16 |
| CN101986108B CN101986108B (en) | 2012-08-15 |
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|---|---|---|---|
| CN 201010285523 Expired - Fee Related CN101986108B (en) | 2010-09-16 | 2010-09-16 | Differential pressure type liquid level measurement device for pressure container |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840896A (en) * | 2012-09-05 | 2012-12-26 | 中国石油化工集团公司 | Liquid level measuring device |
| CN103489492A (en) * | 2012-06-12 | 2014-01-01 | 中国核动力研究设计院 | Passive water level testing device and testing method |
| CN104121960A (en) * | 2014-07-24 | 2014-10-29 | 江苏永钢集团有限公司 | Turbine condensate water hot well water level monitoring device |
| CN104614054A (en) * | 2014-10-17 | 2015-05-13 | 中国神华能源股份有限公司 | Method for verifying boiler drum water level or differential pressure measurement accuracy |
| CN106940215A (en) * | 2017-02-07 | 2017-07-11 | 沈阳华控科技发展有限公司 | A kind of built-in steam drum liquid level measurement device of intelligent compensation |
| CN107525561A (en) * | 2016-06-22 | 2017-12-29 | 山东省冶金设计院股份有限公司 | A kind of steam boiler liquid level of steam drum detecting system |
| CN108168646A (en) * | 2017-12-31 | 2018-06-15 | 中国能源建设集团华东电力试验研究院有限公司 | Heater liquid level density revision data analysis system |
| CN109974808A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of Spent Fuel Pool self-compensation type liquid level measuring system |
| CN111692334A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Pressure vessel liquid level measurement system and method |
| CN112844265A (en) * | 2020-12-31 | 2021-05-28 | 宁波巨化化工科技有限公司 | Liquid level detection device for chloroethane synthesis protection reactor |
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| JP2001317982A (en) * | 2000-05-02 | 2001-11-16 | Ishikawajima Harima Heavy Ind Co Ltd | Drum-level measuring apparatus |
| CN2935101Y (en) * | 2006-08-03 | 2007-08-15 | 铁岭铁光仪器仪表有限责任公司 | Differential pressure water level meter of room temperature single-chamber balance vessel |
| CN201225910Y (en) * | 2008-07-25 | 2009-04-22 | 山东联合化工股份有限公司 | Horizontal pipe type steam dome hydrological gauge |
-
2010
- 2010-09-16 CN CN 201010285523 patent/CN101986108B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001317982A (en) * | 2000-05-02 | 2001-11-16 | Ishikawajima Harima Heavy Ind Co Ltd | Drum-level measuring apparatus |
| CN2935101Y (en) * | 2006-08-03 | 2007-08-15 | 铁岭铁光仪器仪表有限责任公司 | Differential pressure water level meter of room temperature single-chamber balance vessel |
| CN201225910Y (en) * | 2008-07-25 | 2009-04-22 | 山东联合化工股份有限公司 | Horizontal pipe type steam dome hydrological gauge |
Non-Patent Citations (1)
| Title |
|---|
| 《自动化仪表》 19891231 关少博 锅炉汽包液位测量及压力补偿方法 第16-19页 1-2 , 第7期 2 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489492A (en) * | 2012-06-12 | 2014-01-01 | 中国核动力研究设计院 | Passive water level testing device and testing method |
| CN103489492B (en) * | 2012-06-12 | 2016-01-27 | 中国核动力研究设计院 | A kind of non-active water level test device and test method |
| CN102840896A (en) * | 2012-09-05 | 2012-12-26 | 中国石油化工集团公司 | Liquid level measuring device |
| CN104121960A (en) * | 2014-07-24 | 2014-10-29 | 江苏永钢集团有限公司 | Turbine condensate water hot well water level monitoring device |
| CN104614054A (en) * | 2014-10-17 | 2015-05-13 | 中国神华能源股份有限公司 | Method for verifying boiler drum water level or differential pressure measurement accuracy |
| CN107525561A (en) * | 2016-06-22 | 2017-12-29 | 山东省冶金设计院股份有限公司 | A kind of steam boiler liquid level of steam drum detecting system |
| CN106940215A (en) * | 2017-02-07 | 2017-07-11 | 沈阳华控科技发展有限公司 | A kind of built-in steam drum liquid level measurement device of intelligent compensation |
| CN106940215B (en) * | 2017-02-07 | 2023-05-16 | 沈阳华控科技发展有限公司 | Intelligent compensation built-in drum liquid level measuring device |
| CN109974808A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of Spent Fuel Pool self-compensation type liquid level measuring system |
| CN109974808B (en) * | 2017-12-27 | 2024-03-19 | 核动力运行研究所 | Spent fuel pool self-compensating type liquid level measurement system |
| CN108168646A (en) * | 2017-12-31 | 2018-06-15 | 中国能源建设集团华东电力试验研究院有限公司 | Heater liquid level density revision data analysis system |
| CN108168646B (en) * | 2017-12-31 | 2019-08-09 | 中国能源建设集团华东电力试验研究院有限公司 | Heater liquid level density revision data analysis system |
| CN111692334A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Pressure vessel liquid level measurement system and method |
| CN111692334B (en) * | 2020-06-22 | 2022-04-15 | 中国核动力研究设计院 | Pressure vessel liquid level measurement system and method |
| CN112844265A (en) * | 2020-12-31 | 2021-05-28 | 宁波巨化化工科技有限公司 | Liquid level detection device for chloroethane synthesis protection reactor |
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|---|---|
| CN101986108B (en) | 2012-08-15 |
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