CN102486392B - Water level monitoring device and water level monitoring method - Google Patents
Water level monitoring device and water level monitoring method Download PDFInfo
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- CN102486392B CN102486392B CN 201010572550 CN201010572550A CN102486392B CN 102486392 B CN102486392 B CN 102486392B CN 201010572550 CN201010572550 CN 201010572550 CN 201010572550 A CN201010572550 A CN 201010572550A CN 102486392 B CN102486392 B CN 102486392B
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- 238000009825 accumulation Methods 0.000 claims description 15
- 238000004364 calculation methods Methods 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000002309 gasification Methods 0.000 description 25
- 238000007789 sealing Methods 0.000 description 19
- 238000000034 methods Methods 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
Description
Technical field
The present invention relates to a kind of Level monitor and water level monitoring method thereof, relate in particular to a kind of Level monitor for underground coal gasification(UCG) industry and water level monitoring method.
Background technology
Underground coal gasification(UCG) is to be in the process that underground coal directly controlledly burns to produce inflammable gas.Because underground coal gasification(UCG) is to carry out in the underground hydrological environment of an opening, therefore, in the underground coal gasification(UCG) process, need understand gasification zone phreatic situation on every side at any time, the particularly variation of groundwater level is to understand the situation of carrying out of gasification from a side.For example, the decline of water level may mean that the gasification zone is not had by water logging around the gasification zone; In addition, in the underground coal gasification(UCG) process, need pumped well to be set on every side in the gasification zone and draw water, in case the gasification zone is not had by water logging, in pump process, need carry out continuous observation to water level, to understand SEA LEVEL VARIATION; In other situation about need draw water, for example, at the gasification initial stage, water need be discharged air admission hole, in order to charge into vaporized chemical, also need to understand the SEA LEVEL VARIATION situation in the air admission hole.
Known a kind of traditional deep well water level measurement method that is applicable to underground coal gasification(UCG) industry, be that duplex wire is reached in the well along the borehole wall, when the end of a thread with utilize the electric conductivity of water that lead is connected after the water surface contacts, electric current is passed on the meter that refluxes, measure lead and enter the interior length of well, thereby draw water level.The method has threat to the safety of survey crew, the waste lead, and it is bigger to measure water level and actual water level error ratio, and can not at high temperature operate.
In addition, the known utilization method that is positioned over the pressure sensing instrumentation water gaging position in the water is not considered the unevenness of underground water Density Distribution.And in underground coal gasification(UCG) industry, since the influence of gasification, the water quality muddiness around the gasification zone, water layer composition complexity, Density Distribution are very inhomogeneous, and therefore there is very mistake in the water level that adopts standard water density to calculate according to piezometer.
Summary of the invention
Consider the problems referred to above, the inventor has proposed a kind of method and apparatus of novel monitoring missile silo water level.The method according to this invention and device, consider the water layer density difference of different depth, be provided with a plurality of pressure transducers, be respectively applied to measure the pressure of the liquid medium (water that contains impurity) at different depth place, and according to the water level in the pressure values calculating missile silo of a plurality of pressure transducers measurements.Thereby, to compare with adopting single pressure sensor, the water level value that method and apparatus of the present invention is measured is more accurate.
According to an aspect of the present invention, propose a kind of water level monitoring method of monitoring the missile silo water level, may further comprise the steps:
A plurality of pressure transducer fixed interval distance is positioned over the different depth place of the liquid medium in the missile silo successively, with the pressure of the liquid medium of measuring the different depth place;
Calculate the residing degree of depth of each pressure transducer according to the pressure values that each pressure transducer is measured; And
According to the water level in the residing depth calculation missile silo of each pressure transducer.
According to the method for first aspect, wherein, the step that the described pressure values of measuring according to each pressure transducer is calculated the residing degree of depth of each pressure transducer comprises:
A) for per two pressure transducers, set up system of equations I:
ρ 1h 1＝P 1/g????????????????????????????(1)
ρ 2(h 1+d)＝P 2/g????????????????????????(2)
ρ 12×d＝(P 2-P 1)/g?????????????????????(3)
Wherein, h 1Be the residing degree of depth of first pressure transducer in two pressure transducers, ρ 1Be the density of the above liquid medium of first pressure transducer, P 1Be the pressure values that first pressure transducer is measured, g is acceleration of gravity; D is at second pressure transducer below first pressure transducer and the distance between first pressure transducer, ρ 2Be the density of the liquid medium more than second pressure transducer in two pressure transducers, P 2It is the pressure values that second pressure transducer is measured; ρ 12Be the density of the liquid medium between first pressure transducer and second pressure transducer,
B) for per two pressure transducers, according to system of equations I, find the solution h by the calculating of accumulation proportioning 1, obtain one group of h 1Value;
That c) a plurality of system of equations I are found the solution respectively organizes h 1Value compare mutually, find each the group between h 1The value value that equates or approach, as h 1End value.
Wherein, in step b), find the solution h by the calculating of accumulation proportioning 1Step can comprise:
B1) the density a of liquid medium according to a preliminary estimate makes ρ 1=ρ 2=a finds the solution h respectively according to formula (1) and (2) 1If, the h that finds the solution according to formula (1) 1Value greater than the h that finds the solution according to formula (2) 1Value, think ρ 1＜ρ 2
B2) determine the density range ρ of liquid medium LowAnd ρ High, and according to formula (3) calculating ρ 12
B3) make ρ LowAs ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
B4) make ρ 12As ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal the ρ height, thereby obtain h 1A plurality of second calculated values;
B5) compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value.
Wherein, in step b), find the solution h by the calculating of accumulation proportioning 1Step can comprise:
B1) the density a of liquid medium according to a preliminary estimate makes ρ 1=ρ 2=a finds the solution h respectively according to formula (1) and (2) 1If, the h that finds the solution according to formula (1) 1Value less than the h that finds the solution according to formula (2) 1Value, think ρ 2＜ρ 1, then carry out following calculating,
B2) determine the density range ρ of liquid medium LowAnd ρ High, and according to formula (3) calculating ρ 12
B3) make ρ LowAs ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
B4) make ρ 12As ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ HighThereby, obtain h 1A plurality of second calculated values;
B5) compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value.
According to one embodiment of present invention, the quantity of described pressure transducer is three.
According to one embodiment of present invention, step according to the water level in the residing depth calculation missile silo of each pressure transducer comprises: deduct the residing degree of depth of pressure transducer with well head to the height between the pressure transducer, obtain well head to the height between the liquid level of liquid medium, as described water level value.
According to another aspect of the present invention, propose a kind of Level monitor that adopts according to the described method monitoring of first aspect present invention missile silo water level, comprising: a plurality of pressure transducers; Lead, described a plurality of pressure transducers are linked in sequence at an end of described lead with fixed intervals mutually, and are electrically connected to pass through described lead transmission pressure signal with described lead; And the water level meter, described water level meter is connected to the other end of lead, be used for to receive the pressure signal from each pressure transducer, and converts pressure signal to water level signal and export.
According to one embodiment of present invention, the quantity of pressure transducer is three.
According to one embodiment of present invention, described water level meter comprises data processing equipment, and the pressure values that described data processing equipment is used for measuring according to a plurality of pressure transducers is calculated the water level of missile silo.
According to one embodiment of present invention, described water level meter comprises: liquid crystal indicator, data storage device, AD conversion equipment, key board unit, voltage conversion device, rechargable power supplies.
According to one embodiment of present invention, described water level meter comprises: the USB interface device.
According to one embodiment of present invention, described Level monitor comprises packoff, and described packoff is used for forming sealing between Level monitor and well, to adapt to the well environment of requirement sealing.
Should be appreciated that in the present invention term " missile silo " can refer to that any needs carry out the earth drilling of water level monitoring.The residing degree of depth of each pressure transducer refers to that pressure transducer is positioned in the missile silo liquid medium, in the subsurface degree of depth of liquid medium.
Description of drawings
Fig. 1 is system's installation diagram of Level monitor according to an embodiment of the invention;
Fig. 2 is the synoptic diagram that the density stratification of the liquid medium in the missile silo is shown; And
Fig. 3 a-3f is the synoptic diagram that shows the packoff between Level monitor and the missile silo.
Embodiment
Below only by example explanation the specific embodiment of the present invention.Accompanying drawing only illustrates basic conception of the present invention in a schematic way, but not is used for restriction the present invention.
Fig. 1 is system's installation diagram of Level monitor according to an embodiment of the invention.As shown in Figure 1, Level monitor comprises three pressure transducers 1, is linked in sequence at an end of lead 2 with fixed intervals respectively, and is electrically connected to pass through lead 2 transmission pressure signals with lead 2.Level monitor also comprises water level meter 3, and water level meter 3 is connected to an end of lead 2, be used for to receive the pressure signal from each pressure transducer 1, and converts pressure signal to water level signal and export.
As shown in Figure 1, in use, three sensors 1 are positioned over the different depth place of the liquid medium 5 in the missile silo 4 respectively, and spacing each other can be set at 10 meters, with the pressure of the liquid medium 5 of measuring the different depth place.Comprise data processing equipment in water level meter 3, described data processing equipment is used for calculating according to the pressure values that three pressure transducers 1 are measured the water level of missile silo.
According to one embodiment of present invention, Level monitor adopts the 24VDC power supply, and output signal is 0～5VDC, and measurement range is chosen to be 2MPa.
Because the special operation condition of underground coal gasification(UCG), pressure transducer often need be operated near the higher temperature environment in gasification zone, and common pressure transducer working temperature generally is no more than 125 ℃ at present, is not suitable for the special operation condition of underground coal gasification(UCG).Therefore, pressure transducer 1 of the present invention can adopt the WAY-7A sapphire high temperature pressure transmitter that Xi'an microampere electronics technology company limited produces.This transmitter can long-term stable operation at the high humidity severe cold area, not influenced by ambient temperature, maximum pressure can reach 200MPa, medium temperature can reach 200 ℃, satisfies the requirement of underground coal gasification(UCG) water level test.
Lead 2 can adopt PVDF fluoroplastic insulation electric wire, its intensity height, high temperature resistant, corrosion-resistant.Be printed on a meter number on the cable.Lead one end has the metal hermetic collar, and length can be 30cm, is used for the well head sealing.Screen layer is arranged in the lead, be used for the isolation voltage signal.
Water level meter 3 is arranged at ground, and it comprises: data processing equipment, be used for the pressure data from pressure transducer is handled, and finally export water level value in instrument; Liquid crystal indicator is used for showing water level and various out of Memory; Data storage device is for the various data of storage computation process; The AD conversion equipment, the analog signal conversion that is used for input is numerical information; Key board unit is used for the various steering orders of input, realizes human-computer interaction, data download operation, and the instrument reset operation, LCD display etc. is adjusted in the manual operation of removing E2PROM; Voltage conversion device is used for carrying out voltage transitions; Rechargable power supplies; Warning device etc.Particularly, water level meter according to the present invention comprises the USB interface device, and therefore different with traditional water level meter, Level monitor of the present invention can work long hours in off-line state, has saved and has monitored the cost that on-the-spot cable lays.In use only need periodic charge and data to download, can be operated in the unmanned state.
Particularly, water level meter 3 of the present invention can adopt AT89S52 as main control chip, extends out the E2ROM of 16k, 8 AD conversions, 16 * 2 SMC1602A lcd display screen, the quick USB interface of I2C, 24VDC changes the 5VDC chip, and chip all adopts the PQFP encapsulation, and integrated circuit plate size is about 5 * 5cm; Electric power system adopts 24VDC, 10AH lithium battery power supply; Meter case adopts the standard circular shell.Software mainly is made up of Micro Controller Unit (MCU) driving program and accumulation proportioning algorithm.The Micro Controller Unit (MCU) driving program refers to drive AT89S52 single-chip microcomputer and peripheral chip work, transforms the read-write operation of USB, directly the driving etc. of keypad as AD.Accumulation proportioning algorithm illustrates in the back.
In addition, as shown in Figure 1, Level monitor of the present invention can also comprise packoff 6, and described packoff 6 is used for forming sealing between Level monitor and well, to adapt to the well environment of requirement sealing.Particularly, as shown in Figure 1, the borehole wall is provided with for example side pipe 7 of steel, and lead 2 passes the side pipe 7 that arranges on the borehole wall together with the pressure transducer 1 on it and enters in the well 4.For adapting to the requirement of well sealing, described packoff 6 is set, thereby each pressure transducer works in the well environment of sealing between lead 2 and side pipe 7.
Fig. 3 a-3f shows each parts of packoff 6.Shown in Fig. 3 a-3f, packoff 6 comprises wellhead flange 8, well head sealing blind plate 9, well head sealing and fixing plate 10, metal ferrule 11, perforate screw 12 and fixed screw 13,14.Wellhead flange 8, well head sealing blind plate 9, well head sealing and fixing plate 10 all have center drilling, pass for lead 2.Wellhead flange 8 is soldered to the side pipe 7 of transferring lead 2 usefulness.Well head sealing blind plate 9 is mounted to wellhead flange 8 by fixed screw 13.Well head sealing and fixing plate 10 is mounted to well head sealing blind plate 9 by fixed screw 14.The middle perforate of well head sealing and fixing plate 10 is wedge shape.Metal ferrule 11 is fixed on the lead 2.Perforate in the middle of the perforate screw 12 can be passed lead, and is used for metal ferrule 11 is compacted to the wedge shape perforate of well head sealing and fixing plate 10, plays sealing function, shown in Fig. 3 f.
Below explanation utilizes Level monitor of the present invention to detect the method for missile silo water level.
Generally speaking, the water level monitoring method of monitoring missile silo water level of the present invention may further comprise the steps:
A plurality of pressure transducer fixed interval distance is positioned over the different depth place of the liquid medium in the missile silo successively, with the pressure of the liquid medium of measuring the different depth place;
Calculate the residing degree of depth of each pressure transducer according to the pressure values that each pressure transducer is measured; And
According to the water level in the residing depth calculation missile silo of each pressure transducer.
Wherein, the described pressure values of measuring according to each pressure transducer step of calculating the residing degree of depth of each pressure transducer comprises:
A) for per two pressure transducers, set up system of equations I:
ρ 1h 1＝P 1/g????????????????????????????(1)
ρ 2(h 1+d)＝P 2/g????????????????????????(2)
ρ 12×d＝(P 2-P 1)/g?????????????????????(3)
Wherein, h 1Be the residing degree of depth of first pressure transducer in two pressure transducers, ρ 1Be the average density of the above liquid medium of first pressure transducer, P 1Be the pressure values that first pressure transducer is measured, g is acceleration of gravity; D is at second pressure transducer below first pressure transducer and the distance between first pressure transducer, ρ 2Be the average density of the liquid medium more than second pressure transducer in two pressure transducers, P 2It is the pressure values that second pressure transducer is measured; ρ 12Be the average density of the liquid medium between first pressure transducer and second pressure transducer,
B) for per two pressure transducers, according to system of equations I, find the solution h by the calculating of accumulation proportioning 1, obtain one group of h 1Value;
That c) a plurality of system of equations I are found the solution respectively organizes h 1Value compare mutually, find each the group between h 1The value value that equates or approach, as h 1End value.
Wherein, in step b), find the solution h by the calculating of accumulation proportioning 1Step comprise:
B1) the density a of liquid medium according to a preliminary estimate makes ρ 1=ρ 2=a finds the solution h respectively according to formula (1) and (2) 1If, the h that finds the solution according to formula (1) 1Value greater than the h that finds the solution according to formula (2) 1Value, think ρ 1＜ρ 2
B2) determine the density range ρ of liquid medium LowAnd ρ High, and according to formula (3) calculating ρ 12
B3) make ρ LowAs ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
B4) make ρ 12As ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ HighThereby, obtain h 1A plurality of second calculated values;
B5) compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value.
Perhaps, in step b), find the solution h by the calculating of accumulation proportioning 1Step comprise:
B1) the density a of liquid medium according to a preliminary estimate makes ρ 1=ρ 2=a finds the solution h respectively according to formula (1) and (2) 1If, the h that finds the solution according to formula (1) 1Value less than the h that finds the solution according to formula (2) 1Value, think ρ 2＜ρ 1, then carry out following calculating,
B2) determine the density range ρ of liquid medium LowAnd ρ High, and according to formula (3) calculating ρ 12
B3) make ρ LowAs ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
B4) make ρ 12As ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ HighThereby, obtain h 1A plurality of second calculated values;
B5) compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value.
Step according to the water level in the residing depth calculation missile silo of each pressure transducer comprises: deduct the residing degree of depth of pressure transducer with well head to the height between the pressure transducer, obtain well head to the height between the liquid level of liquid medium, export as water level value.
Following with reference to the example of Fig. 2 explanation according to water level monitoring method of the present invention.Fig. 2 illustrates the synoptic diagram of the Density Distribution of the liquid medium in the missile silo.As shown in Figure 2, three pressure transducers 1 are positioned over the different depth place in the missile silo respectively, and the space is apart from d.As shown in the figure, be chosen as 10 meters apart from d.The residing degree of depth of first pressure transducer is h 1, the residing degree of depth of second pressure transducer is h 1+ d, the residing degree of depth of the 3rd pressure transducer is h 1+ 2d.The pressure values that first pressure transducer, second pressure transducer, the 3rd pressure transducer are measured is defined as P respectively 1, P 2And P 3, the average density of the liquid medium more than first pressure transducer is defined as ρ 1, the average density of the liquid medium more than second pressure transducer is defined as ρ 2, the average density of the liquid medium more than the 3rd pressure transducer is defined as ρ 3, the average density of the liquid medium between first pressure transducer and second pressure transducer is defined as ρ 12, the average density of the liquid medium between second pressure transducer and the 3rd pressure transducer is defined as ρ 23, the average density of the liquid medium between first pressure transducer and the 3rd pressure transducer is defined as ρ 13
According to pressure formula, there is following equation:
ρ 1h 1＝P 1/g????????????????????????????(1)
ρ 2(h 1+d)＝P 2/g????????????????????????(2)
ρ 12×d＝(P 2-P 1)/g?????????????????????(3)
ρ 3(h 1+2d)＝P 3/g???????????????????????(4)
ρ 23×d＝(P 3-P 2)/g?????????????????????(5)
ρ 13×2d＝(P 3-P 1)/g????????????????(6)
Compute depth h 1Process as follows:
At first, for first pressure transducer and second pressure transducer, set up system of equations I, and find the solution h according to system of equations I by the calculating of accumulation proportioning 1, ρ 1, ρ 2,
System of equations I:
ρ 1h 1＝P 1/g????????????????????????(1)
ρ 2(h 1+d)＝P 2/g????????????????????(2)
ρ 12×d＝(P 2-P 1)/g?????????????????(3)
Solution procedure is as follows:
At first, the density of liquid medium makes ρ according to a preliminary estimate 1=ρ 2=1000 (density of water is 1000kg/m 3), d=10m finds the solution h respectively according to formula (1) and (2) 1If, the h that finds the solution according to formula (1) 1Value greater than the h that finds the solution according to formula (2) 1Value, think ρ 1＜ρ 2
Then, determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (3) 12, have ρ 1＜ρ 12＜ρ 2
Make ρ Low=1000 as ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
Make ρ 12As ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ High=1600, thus h obtained 1A plurality of second calculated values;
Compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value, and record corresponding ρ 1, ρ 2Value.
In above-mentioned computation process, if the value of the h1 that finds the solution according to formula (1) is less than the h that finds the solution according to formula (2) 1Value, think ρ 2＜ρ 1, then carry out following computation process:
Determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (3) 12, have ρ 2＜ρ 12＜ρ 1
Make ρ Low=1000 as ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ 12Thereby, obtain h 1A plurality of first calculated values;
Make ρ 12As ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ High=1600, thus h obtained 1A plurality of second calculated values;
Compare h 1A plurality of first calculated values and a plurality of second calculated value, find first calculated value, the one group numerical value consistent with second calculated value, as the h that finds the solution according to system of equations I 1Value, and record corresponding ρ 1, ρ 2Value.
Then, for second pressure transducer and the 3rd pressure transducer, set up system of equations II, and according to system of equations II, find the solution h by the calculating of accumulation proportioning 1, ρ 2And ρ 3
System of equations II:
ρ 2(h 1+d)＝P 2/g????????????????(2)
ρ 3(h 1+2d)＝P 3/g???????????????(4)
ρ 23×d＝(P3-P2)/g?????????????(5)
Solution procedure is as follows:
At first, the density of liquid medium makes ρ according to a preliminary estimate 2=ρ 3=1000 (density of water is 1000kg/m 3), d=10m finds the solution h respectively according to formula (2) and (4) 1If, the h that finds the solution according to formula (2) 1Value greater than the h that finds the solution according to formula (4) 1Value, think ρ 2＜ρ 3
Then, determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (5) 23, have ρ 2＜ρ 23＜ρ 3
Make ρ Low=1000 as ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ 23Thereby, obtain h 1A plurality of the 3rd calculated values;
Make ρ 23As ρ 3The initial value of value, and make ρ 3Value add 1 successively, according to formula (4) double counting h 1, up to ρ 3Value equal ρ High=1600, thus h obtained 1A plurality of the 4th calculated values;
Compare h 1A plurality of the 3rd calculated values and a plurality of the 4th calculated value, find the 3rd calculated value one group numerical value consistent with the 4th calculated value, as the h that finds the solution according to system of equations II 1Value, and record corresponding ρ 2, ρ 3Value.
In above-mentioned computation process, if the h that finds the solution according to formula (2) 1Value less than the h that finds the solution according to formula (4) 1Value, think ρ 3＜ρ 2, then carry out following computation process:
Determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (5) 23, have ρ 3＜ρ 23＜ρ 2
Make ρ Low=1000 as ρ 3The initial value of value, and make ρ 3Value add 1 successively, according to formula (4) double counting h 1, up to ρ 3Value equal ρ 23Thereby, obtain h 1A plurality of the 3rd calculated values;
Make ρ 23As ρ 2The initial value of value, and make ρ 2Value add 1 successively, according to formula (2) double counting h 1, up to ρ 2Value equal ρ High=1600, thus h obtained 1A plurality of the 4th calculated values;
Compare h 1A plurality of the 3rd calculated values and a plurality of the 4th calculated value, find the 3rd calculated value one group numerical value consistent with the 4th calculated value, as the h that finds the solution according to system of equations II 1Value, and record corresponding ρ 2, ρ 3Value.
Similarly, for first pressure transducer and the 3rd pressure transducer, set up system of equations III, and find the solution h according to system of equations III by the calculating of accumulation proportioning 1, ρ 1, ρ 3,
System of equations III:
ρ 1h 1＝P 1/g????????????????????(1)
ρ 3(h 1+2d)＝P 3/g???????????????(4)
ρ 13×2d＝(P 3-P 1)/g????????????(6)
Solution procedure is as follows:
At first, the density of liquid medium makes ρ according to a preliminary estimate 1=ρ 3=1000 (density of water is 1000kg/m 3), d=10m finds the solution h respectively according to formula (1) and (4) 1If, the h that finds the solution according to formula (1) 1Value greater than the h that finds the solution according to formula (4) 1Value, think ρ 1＜ρ 3
Then, determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (6) 13, have ρ 1＜ρ 13＜ρ 3
Make ρ Low=1000 as ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ 13Thereby, obtain h 1A plurality of the 5th calculated values;
Make ρ 13As ρ 3The initial value of value, and make ρ 3Value add 1 successively, according to formula (4) double counting h 1, up to ρ 3Value equal ρ High=1600, thus h obtained 1A plurality of the 6th calculated values;
Compare h 1A plurality of the 5th calculated values and a plurality of the 6th calculated value, find the 5th calculated value one group numerical value consistent with the 6th calculated value, as the h that finds the solution according to system of equations III 1Value, and record corresponding ρ 1, ρ 3Value.
In above-mentioned computation process, if the h that finds the solution according to formula (1) 1Value less than the h that finds the solution according to formula (4) 1Value, think ρ 3＜ρ 1, then carry out following computation process:
Determine the density range ρ of liquid medium LowAnd ρ High, rule of thumb value makes ρ Low=1000kg/m 3, ρ High=1600kg/m 3, d=10m can calculate ρ according to formula (6) 13, have ρ 3＜ρ 13＜ρ 1
Make ρ Low=1000 as ρ 3The initial value of value, and make ρ 3Value add 1 successively, according to formula (4) double counting h 1, up to ρ 3Value equal ρ 13Thereby, obtain h 1A plurality of the 5th calculated values;
Make ρ 13As ρ 1The initial value of value, and make ρ 1Value add 1 successively, according to formula (1) double counting h 1, up to ρ 1Value equal ρ High=1600, thus h obtained 1A plurality of the 6th calculated values;
Compare h 1A plurality of the 5th calculated values and a plurality of the 6th calculated value, find the 5th calculated value one group numerical value consistent with the 6th calculated value, as the h that finds the solution according to system of equations III 1Value, and record corresponding ρ 1, ρ 3Value.
After the value that solves system of equations I, II and III, the data of respectively organizing that system of equations I, II and III are found the solution compare, and find h 1The value value that equates or approach, as final calculated value, and with corresponding ρ 1, ρ 2, ρ 3Value as ρ 1, ρ 2, ρ 3End value.
Then, according to the water level in the residing depth calculation missile silo of each pressure transducer.Computing method are: deduct the residing degree of depth of pressure transducer with well head to the height between the pressure transducer, obtain well head to the height between the liquid level of liquid medium, as described water level value.
According to embodiments of the invention, adopt the lead 2 marked the rice number, therefore, the liquid level that calculates water level and be liquid medium apart from the formula of the height L of well head is: L=lead total length-h 1The conductor length of the above horizontal component of-2d-liquid level deposits the L value of calculating in E2PROM, and the liquor charging crystal display shows.
Below explanation is according to the application example of Level monitor of the present invention.
Example 1:
Level monitor of the present invention is used for a hydrologic observation well.This well was the gasification well in the past, reach serviceable life after, change the hydrologic observation well into, this well act as water-level observation, pump drainage water, environment monitoring etc.Owing to be the gasification well in the past, so the shaft bottom exists a large amount of lime-ash, tar and impurity etc., cause water quality extremely muddy, therefore adopt traditional pressure monitoring device can't obtain measurement result accurately.This well depth is 290 meters.Because carry out hydrologic observation every day, so this well do not need sealing, the pressure transducer of the bottommost of Level monitor of the present invention transferred to 280 meters measure, and calculates through instrument that to obtain water level at last be 161.54 meters.Utilize the test of conventional condenser water level meter, last measurement result is 161.5 meters, has verified that Level monitor of the present invention can obtain measurement result accurately under the water turbidity condition.
Example 2:
Be used to underground coal gasification(UCG) to carry the air admission hole of vaporized chemical Level monitor of the present invention.For this air admission hole, the gasification initial stage need by pressing mode with the water exhaust opening at the bottom of, therefore require under hermetically sealed condition, to carry out water-level observation.This well depth is 300 meters, transfers pressure transducer according to Fig. 1, the bottom sensor is transferred to 298 meters, and seal according to Fig. 3, and the air inlet well pressure remains on 15 kilograms.By externally measured, there is not any gas leak phenomenon in seal, shows that sealing state is good.In pressure process, observe water level and constantly descend, until showing that liquid level is zero.Verified the reliability that water-level observation device of the present invention is worked under air-proof condition.
Level monitor of the present invention and water level monitoring method, have the following advantages: owing to adopt a plurality of pressure transducers and rational accumulation proportioning algorithm, solved conventional pressure sensor can't be under the condition of water turbidity and uncertain Density Distribution the problem of correct measurement; In addition, as required, level measurement device of the present invention can be worked under air-proof condition.And traditional water level meter general work if water-level observation point is far away apart from the pulpit, needs the cable of long distance to lay in presence, and cost is higher.Level monitor of the present invention is provided with USB interface, and data can directly be downloaded to USB flash disk, can work long hours in off-line state, has saved the laid down cost of ground cable.
Describe that more than embodiments of the invention only exemplarily being described, but not be used for restriction the present invention, know and it will be understood by those skilled in the art that under the situation that does not depart from essence of the present invention, any distortion that the present invention is done all within the scope of the invention.And the present invention is that example has illustrated the present invention with underground coal gasification(UCG) industry.But obviously the present invention also can be used for other and similarly need application scenario, monitoring underground water table ground.In addition, the present invention is with the example of water as liquid medium, but liquid medium can be oil or other liquid.
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| CN104949731A (en) * | 2014-03-27 | 2015-09-30 | 江西飞尚科技有限公司 | Tailings water level measuring system based on errors of liquid density eliminated by osmometer |
| TWI510764B (en) * | 2014-08-08 | 2015-12-01 | ||
| CN104457901B (en) * | 2014-11-28 | 2018-01-05 | 南京信息工程大学 | A kind of method and system for determining the depth of water |
| CN105043361B (en) * | 2015-06-23 | 2018-01-05 | 中国环境科学研究院 | Water depth measuring instrument for the environment flow evaluation method of zoobenthos protection target |
| CN106959143A (en) * | 2017-03-22 | 2017-07-18 | 中国科学院上海微系统与信息技术研究所 | A kind of self adaptation high-precision pressure formula water level monitoring warning device and method |
| CN108643266A (en) * | 2018-05-21 | 2018-10-12 | 徐工集团工程机械有限公司 | A kind of Double-wheel milling sounding gear |
| CN109360378A (en) * | 2018-10-21 | 2019-02-19 | 苏州高新区建金建智能科技有限公司 | A kind of architectural engineering alarm device with optical fiber lamp |
| CN109632034A (en) * | 2018-12-12 | 2019-04-16 | 贵州荣创信息科技有限公司 | A kind of oil mass detection device and oil mass detection method |
| CN110044439B (en) * | 2019-04-23 | 2020-10-02 | 山东省地质矿产勘查开发局第八地质大队(山东省第八地质矿产勘查院) | Multi-parameter remote automatic pumping test recorder and method thereof |
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