CN105509803A - Device for accurately measuring liquid level and solid liquid ratio of salt-making evaporation equipment - Google Patents

Device for accurately measuring liquid level and solid liquid ratio of salt-making evaporation equipment Download PDF

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Publication number
CN105509803A
CN105509803A CN201510875333.3A CN201510875333A CN105509803A CN 105509803 A CN105509803 A CN 105509803A CN 201510875333 A CN201510875333 A CN 201510875333A CN 105509803 A CN105509803 A CN 105509803A
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CN
China
Prior art keywords
liquid level
liquid
pressure
solid
evaporation equipment
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Pending
Application number
CN201510875333.3A
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Chinese (zh)
Inventor
王天河
孟兴智
宋礼慧
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CNSIC ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co Ltd
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CNSIC ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co Ltd
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Priority to CN201510875333.3A priority Critical patent/CN105509803A/en
Publication of CN105509803A publication Critical patent/CN105509803A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass

Abstract

The invention relates to a device for accurately measuring the liquid level and the solid liquid ratio of salt-making evaporation equipment. According to the technical scheme of the invention, the pressure measurement points of three pressure transmitters are respectively arranged at thee different height positions of a vaporization device, wherein one is arranged above the liquid level and the other two are arranged in the liquid level. The pressure measurement point P1 above the liquid level is placed at a distance of 2-3 mm from the liquid level. The pressure measurement point P2, in the liquid level, is placed at a distance of 1-3 mm below the standard liquid level of the vaporization device. The pressure measurement point P3, in the liquid level, is placed at a distance of 1-6 mm below the pressure measurement point P2. According to the technical scheme of the invention, the liquid pressure between two different-height points of a vaporizing tank can be measured by means of three pressure transmitters. Based on the pressure difference, the density of the liquid phase can be calculated. The solid liquid ratio inside the vaporizing tank can be reflected based on the linear relationship between the measured density and the solid liquid ratio. Meanwhile, the liquid level of the vaporizing tank can be calculated more accurately based on the measured density and the pressure difference between the liquid phase and the gas phase.

Description

The device of a kind of Measurement accuracy salt manufacturing evaporation equipment liquid level and solid-to-liquid ratio
Technical field
Patent of the present invention relates to the measurement mechanism of a kind of Measurement accuracy salt manufacturing evaporation equipment liquid level and solid-to-liquid ratio.
Background technology
The production run of salt making apparatus is that evaporation and concentration separates out NaCl, then becomes specification product after dehydrating to contain bittern water for raw material.In vacuum salt making facility production run, solid-to-liquid ratio in the liquid level of evaporation equipment and equipment, two each and every one very important controling parameters in salt manufacturing evaporation technology, if liquid level is too high, liquid phase static pressure not only can be made to increase, reduce evaporation capacity, affect productive capacity, and secondary steam easily carries band bittern secretly, aggravate, to the corrosion of lower effect heating chamber equipment, also can affect condensate water water quality; Liquid level is too low, and static pressure reduces, and cause material at heating boiling in ducts, the generation of aggravation salt crust, makes heating tube block, production is stopped.Meanwhile, the solid-to-liquid ratio in equipment also will control to rational scope, and solid-to-liquid ratio is too high causes the wearing and tearing aggravation power consumption simultaneously of equipment to increase, and causes motor overload time serious; In equipment, solid-to-liquid ratio is too low also can cause the solids content in the salt slurry of discharge to reduce, and the salt slurry of discharge increases relatively, causes a large amount of heats with salt slurry discharge system.Therefore the solid-to-liquid ratio in the liquid level of evaporation equipment and equipment must control in a rational scope, is easy to break technological balance, causes adverse effect to production once exceed specialized range.
Current salt manufacturing evaporation equipment level gauging generally adopts gas-liquid two-phase 2 manometrys, preset the density of liquid when measuring, because density has no small fluctuation in evaporation process, the level error causing this metering system to measure is larger, especially at running-in period, undulatory property is stronger.To the Measurement accuracy of evaporation equipment liquid level and control in production run, vital effect is played to the control of process units state of the art, technological parameter, plant efficiency, production capacity and energy-saving and cost-reducing aspect.
The measurement of solid-to-liquid ratio is also a very important job in salt industry, and the operations such as salt manufacturing evaporation, the desalinization of soil by flooding or leaching have stricter regulation to this index of solid-to-liquid ratio, once solid-to-liquid ratio exceeds specialized range, just very likely causes adverse effect to production.At present, solid-to-liquid ratio is mostly manual measurement, have random large, subjectivity is strong and discontinuous drawback, thus accuracy can not be guaranteed, also the variation tendency be not easy to by observing solid-to-liquid ratio adjusts salt discharge and Salt wash process in time, is unfavorable for the stable operation of producing.As can be seen here, the accurate continuously self-operated measuring unit of solid-to-liquid ratio is also very necessary to commercial production.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes the measurement mechanism of an a kind of Measurement accuracy salt manufacturing evaporation equipment liquid level and solid-to-liquid ratio; 3 manometrys are utilized to measure evaporation equipment liquid level and solid-to-liquid ratio.
Concrete technical scheme is as follows:
The measurement mechanism of a kind of Measurement accuracy salt manufacturing evaporation equipment liquid level and solid-to-liquid ratio; The pressure point of its three pressure units is separately positioned on evaporation equipment three differing heights positions, and one is arranged on above liquid level; Two are arranged in liquid level.
Pressure tap P above preferred wherein liquid level 1be positioned over evaporation equipment standard ullage 2m ~ 3m place, the pressure tap P above in liquid level 2be positioned over the pressure tap P above in evaporation equipment titer basifacial 1m ~ 3m place, liquid level 3be positioned over 1m ~ 6m place, pressure tap P2 bottom.
Liquid phase part pressure pressure tap place is arranged blows liquid device; Gaseous phase partial pressure power pressure tap P 1place's measurement vapour phase partial pressure also can not be established and blow liquid device, P 2, P 3place must be arranged blows liquid device.Arranging the object of blowing liquid device is prevent the diaphragm of transmitter from directly contacting crystal corrosion with feed liquid in evaporation equipment,
1. evaporation equipment level measuring method is as follows:
According to formula △ P=ρ g △ h, wherein ρ is the density of evaporation equipment liquid phase salt slurry, and g is acceleration of gravity.In actual production, h2 is pressure tap P 1to pressure tap P 3distance namely need measure equipment liquid level, be change, h1 is pressure tap P 2to pressure tap P 3distance, being the liquid level preset, is constant;
First, pressure unit is utilized first to record the pressure value P of three points 1, P 2, P 3, according to P 3-P 2=△ P 32=ρ gh 1, gravity acceleration g=9.81N/Kg, h1 is the level altitude preset, then evaporation equipment salt pulp density ρ=△ P 32/ gh1 can obtain.
Again according to P 3-P 1=△ P 31=ρ gh 2, wherein P 3, P 1two transmitters record, and gravity acceleration g is known, due to P 1position comparatively near apart from equipment liquid level, its pressure recorded is approximately equal to the gaseous pressure at liquid level place, evaporation equipment salt pulp density ρ=△ P 32/ gh 1try to achieve by calculating, then evaporation equipment liquid level h 2=△ P 31/ ρ g=△ P 31h 1/ △ P 32.
2. the measurement of 3 manometry solid-to-liquid ratios
The density p of feed liquid in equipment is obtained in the measuring process of evaporation equipment liquid level, according to formula △ P=ρ g △ h, the change of density can cause the change of pressure differential, the change of solid-to-liquid ratio to cause the change of solution composition, and by pressure differential reacting condition out.
Solid-to-liquid ratio in salt solusion and the corresponding relation of its density are as shown in Table 1
The mapping table of table one solid-to-liquid ratio and its density
Solid-to-liquid ratio The density p of solution
kg/m 3
0 1210
10 1265
20 1323
30 1379
40 1434
50 1492
60 1548
The data of table one are substituted into formula △ P=ρ g △ h (g gets 9.8N/Kg, and △ h gets 1m), and we obtain solid-to-liquid ratio and Δ P corresponding data, as shown in Table 2
Table two solid-to-liquid ratio and Δ P corresponding data table
Solid-to-liquid ratio ΔP
Kp
0 11.858
10 12.397
20 12.965
30 13.514
40 14.053 2 -->
50 14.621
60 15.170
Utilize the data in table two, we draw out the relation of Δ P and solid-to-liquid ratio, as shown in Figure 2.
Can be found out by graph of a relation, solid-to-liquid ratio and the Δ P of supersaturated salt solution are linear.
The present invention applies three pressure units, measure differing heights 2 liquid phase pressure on evaporator, the density of liquid phase is calculated according to its differential pressure gauge, according to the density measured and the linear solid-to-liquid ratio reflected in evaporator of solid-to-liquid ratio, again by surveying the pressure reduction of density and liquid gas phase, calculate the liquid level of evaporator more accurately.
Accompanying drawing explanation
Fig. 1: three point method level gauging schematic diagram;
Fig. 2: solid-to-liquid ratio and differential pressure corresponding relation figure;
Fig. 3: salt making apparatus two-effect evaporation equipment liquid level gauge actual installation figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
As shown in Figure 1, Figure 3: the pressure point of three pressure units is separately positioned on evaporation equipment three differing heights positions, and one is arranged on above liquid level; Two are arranged in liquid level.Pressure tap P wherein above liquid level 1be positioned over evaporation equipment standard ullage 2m ~ 3m place, the pressure tap P above in liquid level 2be positioned over the pressure tap P above in evaporation equipment titer basifacial 1m ~ 3m place, liquid level 3be positioned over 1m ~ 6m place, pressure tap P2 bottom.
Liquid phase part pressure pressure tap P 2, P 3place and gas phase partial pressure pressure tap P 1liquid device is blown in place's setting.
1) embodiment 1
When arranging, preset P 2, P 3difference in height h 1=1m, measures to obtain P respectively by pressure unit 1=57.766Kp, P 2=138.347Kp, P 3=150.744Kp
Evaporation equipment feed liquid density p=△ P 32/ gh 1
=(P 3-P 2)/gh 1
=1265kg/m 3
Feed liquid solid-to-liquid ratio in evaporation equipment, according to ρ=1265kg/m 3, tabling look-up one can obtain 10%
The liquid level h2=△ P of evaporation equipment 31/ ρ g
=(P 3-P 1)h 1/(P 3-P 2)
=△P 31h 1/△P 32
=7.5m
When tradition two-point method measures liquid level, the density p=1300kg/m of general setting feed liquid 3, now, when measuring to obtain P respectively by pressure unit 1=57.766Kp, P 3during=150.744Kp, the liquid level of the evaporation equipment obtained:
h2=△P 31/ρg
=(150.744-57.766)/(9.8*1300)
=7.3m
Compared with the liquid level measured with three point method, low 0.2m, measuring error is-2.67%.
2) embodiment 2
When designing, preset P 2, P 3difference in height h 1=5m, measures to obtain P respectively by pressure unit 1=11.941Kp, P 2=44.597Kp, P 3=112.168Kp
Evaporation equipment feed liquid density p=△ P 32/ gh 1
=(P 3-P 2)/gh 1
=1379kg/m 3
Feed liquid solid-to-liquid ratio in evaporation equipment, according to ρ=1379kg/m 3, tabling look-up one can obtain 30%
The liquid level h of evaporation equipment 2=△ P 31/ ρ g
=△P 31h 1/△P 32
=(P 3-P 1)h 1/(P 3-P 2)
=7.4m
When tradition two-point method measures liquid level, the density p=1300kg/m of general setting feed liquid 3, now, when measuring to obtain P respectively by pressure unit 1=11.941Kp, P 3during=112.168Kp, the liquid level of the evaporation equipment obtained
h2=△P 31/ρg
=(112.168-11.941)/(9.8*1300)
=7.9m
Compared with the liquid level measured with three point method, high 0.5m, measuring error is+6.76%.
The measurement mechanism of the present invention open and a kind of Measurement accuracy salt manufacturing evaporation equipment liquid level of proposing and solid-to-liquid ratio, those skilled in the art are by using for reference present disclosure, the links such as suitable change condition route realize, although method of the present invention and technology of preparing are described by preferred embodiment, person skilled obviously can change Method and Technology route as herein described or reconfigure not departing from content of the present invention, spirit and scope, realizes final technology of preparing.Special needs to be pointed out is, all similar replacements and change apparent to those skilled in the art, they are deemed to be included in spirit of the present invention, scope and content.

Claims (3)

1. the measurement mechanism of a Measurement accuracy salt manufacturing evaporation equipment liquid level and solid-to-liquid ratio; It is characterized in that the pressure point of three pressure units is separately positioned on evaporation equipment three differing heights positions, one is arranged on above liquid level; Two are arranged in liquid level.
2. device as claimed in claim 1, is characterized in that the pressure tap P above wherein liquid level 1be positioned over evaporation equipment standard ullage 2m ~ 3m place, the pressure tap P above in liquid level 2be positioned over the pressure tap P above in evaporation equipment titer basifacial 1m ~ 3m place, liquid level 3be positioned over 1m ~ 6m place, pressure tap P2 bottom.
3. device as claimed in claim 1, is characterized in that liquid phase part pressure pressure tap place is arranged and blows liquid device.
CN201510875333.3A 2015-12-02 2015-12-02 Device for accurately measuring liquid level and solid liquid ratio of salt-making evaporation equipment Pending CN105509803A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106769656A (en) * 2016-12-29 2017-05-31 自贡市轻工业设计研究院有限责任公司 A kind of method of solid-to-liquid ratio in accurate measurement vacuum evaporator
CN108763826A (en) * 2018-06-20 2018-11-06 淮阴工学院 The dynamic prediction method of solid-to-liquid ratio in a kind of vacuum salt production evaporator

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041111A (en) * 1988-09-16 1990-04-11 张修清 Multifunctional evaporating equipment and liquid level controlling method
CN1046977A (en) * 1990-05-26 1990-11-14 自贡市轻工业设计研究院 Differential pressure transmitter is measured vacuum salt production salt slurry solid-to-liquid ratio
JP2001247604A (en) * 2000-03-08 2001-09-11 Japan Polychem Corp Preparation method of alpha-olefin polymer
CN1971220A (en) * 2006-11-30 2007-05-30 浙江大学 Measuring device and method for liquid level of volatilizable variable-density medium
CN101732885A (en) * 2010-01-16 2010-06-16 江阴丰力生化工程装备有限公司 Continuous crystallizer
CN102116660A (en) * 2010-11-15 2011-07-06 天脊煤化工集团股份有限公司 Correction method for multi-point measurement of steam drum liquid level of high pressure boiler
CN202297162U (en) * 2011-10-24 2012-07-04 王石柱 Low temperature pyrogen-free vacuum salt production device
CN202836678U (en) * 2012-08-17 2013-03-27 河北钢铁股份有限公司承德分公司 Liquid level measurement device with scavenging function
CN203929169U (en) * 2014-05-25 2014-11-05 中石化南京工程有限公司 A kind of accurate measuring systems for gasification furnace shock chamber liquid level
CN205192534U (en) * 2015-12-02 2016-04-27 中盐工程技术研究院有限公司 Device of accurate measurement salt manufacturing evaporation equipment liquid level and solid -to -liquid ratio

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041111A (en) * 1988-09-16 1990-04-11 张修清 Multifunctional evaporating equipment and liquid level controlling method
CN1046977A (en) * 1990-05-26 1990-11-14 自贡市轻工业设计研究院 Differential pressure transmitter is measured vacuum salt production salt slurry solid-to-liquid ratio
JP2001247604A (en) * 2000-03-08 2001-09-11 Japan Polychem Corp Preparation method of alpha-olefin polymer
CN1971220A (en) * 2006-11-30 2007-05-30 浙江大学 Measuring device and method for liquid level of volatilizable variable-density medium
CN101732885A (en) * 2010-01-16 2010-06-16 江阴丰力生化工程装备有限公司 Continuous crystallizer
CN102116660A (en) * 2010-11-15 2011-07-06 天脊煤化工集团股份有限公司 Correction method for multi-point measurement of steam drum liquid level of high pressure boiler
CN202297162U (en) * 2011-10-24 2012-07-04 王石柱 Low temperature pyrogen-free vacuum salt production device
CN202836678U (en) * 2012-08-17 2013-03-27 河北钢铁股份有限公司承德分公司 Liquid level measurement device with scavenging function
CN203929169U (en) * 2014-05-25 2014-11-05 中石化南京工程有限公司 A kind of accurate measuring systems for gasification furnace shock chamber liquid level
CN205192534U (en) * 2015-12-02 2016-04-27 中盐工程技术研究院有限公司 Device of accurate measurement salt manufacturing evaporation equipment liquid level and solid -to -liquid ratio

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106769656A (en) * 2016-12-29 2017-05-31 自贡市轻工业设计研究院有限责任公司 A kind of method of solid-to-liquid ratio in accurate measurement vacuum evaporator
CN108763826A (en) * 2018-06-20 2018-11-06 淮阴工学院 The dynamic prediction method of solid-to-liquid ratio in a kind of vacuum salt production evaporator

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