CN1162640C - Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment - Google Patents

Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment Download PDF

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Publication number
CN1162640C
CN1162640C CNB011143347A CN01114334A CN1162640C CN 1162640 C CN1162640 C CN 1162640C CN B011143347 A CNB011143347 A CN B011143347A CN 01114334 A CN01114334 A CN 01114334A CN 1162640 C CN1162640 C CN 1162640C
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China
Prior art keywords
concentration
flow
slurry
muddy
multiphase flow
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CNB011143347A
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Chinese (zh)
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CN1395055A (en
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肖诗忠
邹履泰
李凡
王天福
段炼中
蒋志忠
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肖诗忠
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Abstract

The present invention relates to a method and a device for measuring the concentration of a pipeline conveyed slurry body and the solid phase content of multiphase flow. Primary conversion devices are a pressure sensor 25 and a flow sensor 8; a data collecting and converting module 12, a logistic equation computation module 13 and a concentration alarm module 16 are arranged in a computer, wherein the data collecting and converting module 12 is used for processing the pressure signal and the flow signal; the logistic equation computation module 13 computes the concentration of the slurry and the multiphase flow according to the logistic model GT=[Y <clearing>/1-Rc'-Y <clearing>]/(Y<sand>-Y<clearing>). In the present invention, the characteristic that the resistance in the pipeline conveyance of the slurry and the changing law of flow are changed with the differences of concentration is used; the concentration can be directly measured without a concentration meter. The problem that the concentration of multiphase flow of a slurry is difficult to be measured in the engineering is solved. The present invention has the advantages of clear principles, simple method, high precision, simple device, easy operation, etc.

Description

The method of measuring channel slurry body concentration and multiphase flow solid concentration and device

Technical field

The present invention relates to the determining method and the device of concentration and multiphase flow, the method and the device of especially a kind of measuring channel slurry body change in concentration and multiphase flow solid concentration.

Background technique

In departments such as metallurgy, chemical industry, oil, medicine, river dredging, electric power, mass transport extensively adopts pipe-line system at present.Two-phase (or heterogeneous) fluid uninterruptedly flows in pipe-line system, turns round continuously for production system.No matter be to consider that from the consideration of safe transport angle or from the economical operation aspect slurry is in pipe conveying procedure, the mensuration of its concentration is vital, and it is to implement the requisite location parameter of regulating and controlling.For example: aforementioned industry is when carrying out multiphase flow (solid, liquid, gas) line transportation, slurry must have a rational quantity delivered in pipeline, silting can not take place, essential again assurance economical operation, the mensuration of this output is carried out according to hydromechanical classical formulas: output=C T* Q * S.C TBe slurry body concentration, Q is a slurry body flow under the certain pressure, and S is the unit time.The mensuration of flow and pressure has been the problem that is easy to solve, yet for the mensuration of concentration, seems simple, very difficult actually.Because sampling can bring a series of problems such as sealing on the pressure piping, add that putting ducted determination sensor into goes required precision to cause measuring failure because of being wrapped up by slurry or wearing and tearing easily.At present domestic and international application more, precision still can concentration in respect of two kinds: the one, the nuclear radiation densitometer, its advantage is that precision is higher, can reach 3% with interior error, and shortcoming is that nuclear radiation has harm to human body, environment is caused nuclear pollution, can not use easily generally speaking.The 2nd, ultrasonic Doppler Micro ADv system--the doppler velocimeter from the U.S. introduces is used for measuring concentration, is 15kg/M containing sand 3In the scope, i.e. volume concentration scope C vJust have enough precision in the time of in≤0.006, and this instrument is higher, platform is 3.5 dollars.Therefore the mensuration of slurry concentration and multiphase flow dynamic value in the conveyance conduit is the problem that does not solve completely on the engineering always, directly influences the control of multiphase flow slurry, and adjusting and output are appraised and decided.

Summary of the invention

The purpose of this invention is to provide a kind of need by measuring the flow and the pressure of slurry body and multiphase flow, its change in concentration of method indirect measurement and multiphase flow dynamic value with mathematical model, be difficult for the problem measured to solve slurry body concentration and polymorphic stream in the aforementioned prior art, and and then solve its output computational problem.

The present invention utilize the slurry multiphase flow pipeline carry in the Changing Pattern of resistance and flow with the different characteristics that change of concentration, provide a kind of needs by mensuration slurry body and the flow of multiphase flow and method and the device that pressure is measured its concentration and multiphase flow dynamic value.

The device of said measuring channel slurry body concentration and multiphase flow solid concentration, by primary transducer spare, transmitter, I/V transducer and computer are formed, it is characterized in that: described primary transducer spare is pressure transducer 25 and the flow transducer 8 that is installed on slurry and the multiphase flow conveyance conduit, be provided with the data capture modular converter 12 that is used to handle this pressure and flux signal in the computer, according to mathematical model Calculate the matheematical equation module 13 and the concentration module 16 of slurry and multiphase flow concentration; Described transmitter is pressure transmitter and flow sensing transducer; Converted to standard signal after the I/V transducer is input to computer through A/D converter again by measuring pressure and flux signal through transmitter; V in the formula ClearlyBe clear water mean velocity, V MuddyBe the muddy water mean velocity, Be muddy water flow minimizing value relatively, Y ClearlyBe clear water unit weight, Y HuskyBe silt unit weight, C TBe slurry concentration, Q MuddyBe muddy water flow value under the different pressures.

The method of said measuring channel slurry body concentration and multiphase flow solid concentration is characterized in that: measuring channel slurry body concentration and multiphase flow solid concentration are by being preset in the mathematical model in the calculator Carry out, wherein muddy water flow minimizing value relatively R c' in contained different pressures muddy water flow minimizing value relatively Q MuddyWith muddy water mean velocity V MuddySampled signal from pressure transducer on the conveyance conduit and flow transducer; In computer, press formula C T* Q * S calculate the output of the slurry of surveying and multiphase flow solid concentration; C in the formula TBe slurry body concentration, Q is a slurry body flow under the certain pressure, and S is the time, Q MuddyBe muddy water flow value under the different pressures, V ClearlyBe clear water mean velocity, V MuddyBe the muddy water mean velocity, Be muddy water flow minimizing value relatively, Y ClearlyBe clear water unit weight, Y HuskyBe silt unit weight.

Described method is provided with the alarming value of adjustment to concentration, and scope is between 28~38%.Described tested slurry unit weight Y mAccording to empirical correlation and the actual composition adjustment of silt, get Y usually m=2.65T/m 3

The device of described measuring channel slurry body concentration and multiphase flow solid concentration is characterized in that: described computer is the PC process control machine more than 486, and eight A/D change-over panels are arranged, and runs under the Windows software environment, and has the above operation system of Win32API.Described computer also can be single-chip microcomputer.

Exist as Fig. 1 between its energy consumption and the mean velocity when slurry and multiphase flow are carried in pipeline and show relation.Among the figure: J mExpression can the slope, i.e. energy loss on the unit length, and V is the mean velocity of conduit section, as can be seen from the figure, clear water is with J m~V increases and J mIncrease, in linear relation.For muddy water Fen Si district: 1 district is even suspension area: 2 districts are non-homogeneous suspension areas: 3 districts are that the pipe bottom moves floor district, and promptly have tractional load to move: 4 districts are plugging hazardous areas.

In line transportation, always make it be in 1 or 2 districts and carry, this two district is the straight line that is parallel to clear water basically.That is to say that as long as when being in even suspension area or non-homogeneous suspension area, it can be regarded as and be parallel to the clear water line basically.

By the electromagnetic flowmeter measurement of discharge, flow is Q during clear water Clearly, the clear water mean velocity is V=Q Clearly/ 0.25 π d 2Right, i.e. V ∝ Q ClearlyFor muddy water, should act on quality and keep the weighing apparatus law under the condition that power equipment and pipe-line transportation system remain unchanged: promptly under pipe-line system power equipment permanence condition, can carry the quality of clear water and muddy water to remain unchanged, also be that exerting oneself of system is certain, clear water unit weight is little, and flow is just big; And muddy water unit weight is big, and then flow is just little, but keeps Y * Q=m.Y is tested slurry capacity in the formula, and Q is tested slurry flow, and m is tested slurry quality.

Can get the relative direct ratio that is reduced to flow velocity of muddy water flow minimizing value by Fig. 2, making it is R c' promptly

If the clear water unit time is carried quality: m Clearly=Y Clearly* Q Clearly(2)

Then the muddy water flow is by (1) formula

Q Clearly-Q Muddy=R c' * Q Clearly

:

Q Muddy=(1-R c') * Q Clearly(3)

Quality when then the unit time is carried muddy water is:

m Muddy=Y m* Q Muddy=Y m(1-R c') * Q Clearly(4)

(2)=(4) when the throughput of pipeline mass conservation

Y m(1-R c') * Q Clearly=Y Clearly* Q Clearly(5)

Slurry unit weight Y again m=Y Clearly(1-C T)+Y Husky* C T(6)

(5)=(6)

:

Work as Y Clearly=1.0T/m 3, Y Husky=2.65T/m 3The time (capacity of water, the unit weight of silt) substitution (7) formula:

C T = ( 1 1 - R c &prime; - 1 ) / 1.65

C herein TExpression slurry transportation concentration is when slurry is in even suspension and carries: C T=C V(volume concentration).

Because 0≤C TSo<1 1.0≤Y m<65T/m 3

Reduce relative value R according to flow c' difference try to achieve the capacity of different slurries and relative slurry transportation concentration; C when normal the excavation TBe worth generally 15~25%, maximum value is nearly 30%, and according to actual motion, we 35%, to avoid plugging to the warning concentration limit, and perhaps error increases.

The condition that we need: 1) because calibration clear water value is wanted in the wearing and tearing of equipment, aging in certain cycle; 2) the concentration limit zone is in operation below 35%, 3) slurry carried is under the sufficient state of suspension.

In formula (1)~(7), Q ClearlyBe clear water flow value under the power, Q MuddyBe muddy water flow value under the different pressures, V ClearlyBe clear water mean velocity, V MuddyBe muddy water mean velocity, R c' be muddy water flow minimizing value relatively, Y mBe slurry unit weight, Y ClearlyBe clear water unit weight, Y HuskyBe silt unit weight, C TBe slurry concentration, m ClearlyBe clear water quality, m MuddyBe the muddy water quality.

Clear water flow value Q under the different pressures in the formula (1) Clearly, clear water mean velocity V ClearlyActual measurement obtains, and is pre-stored in and makes computing parameter in the process control machine, wherein obtains Q Clearly, V ClearlySample number is ripe prior art, clear water unit weight Y in the formula (7) ClearlyBe 1, silt unit weight Y HuskyBe 2.65T/m 3(silt fluid mechanics constant), more than every known quantity that is, only muddy water flow minimizing value relatively R c' in still contain different pressures muddy water flow value Q MuddyWith muddy water mean velocity V MuddyTo be determined, if collect muddy water flow, pressure, can obtain muddy water according to formula (7) mathematical model easily indirectly or claim the change in concentration of slurry and the dynamic value of multiphase flow, so can solve the problem that the prior art slurry concentration is difficult for mensuration.Based on this, the present invention makes to measure the primary transducer spare of slurry concentrations, multiphase flow dynamic value with being installed on pressure transmission rod 7 on the slurry transportation pipeline and flow transducer 8, convert the standard electric signal to through pressure transmitter and flow transmitter, after the A/D conversion, be input to process control machine 11; Be provided with the data capture modular converter 12 that is used to handle tested pipeline pressure and pipeline flow in the process control machine, calculate the matheematical equation computing module 13 of multiphase flow concentration and output according to formula (7), concentration alarm module 16, and some general output accumulative total and statistics, help, inquiry, the picture module such as read shelves, withdraw from of handling, print, file.

The present invention utilizes the different characteristics that change of the Changing Pattern of resistance and flow in the Slurry Pipeline Transportation with concentration, derive theoretically and utilize actual measurement slurry flow and pressure parameter to set up the mathematical model of measuring slurry concentration, and proposed that complete mensuration slurry concentration changes and the detection of multiphase flow dynamic value, the number reason is calculated, show, report to the police, store, accumulative total, help, inquiry, picture is handled, print, the method and apparatus of shelves read in file, and can reserve the control output interface, the network monitoring interface, realize not wanting densitometer and only need pass through mensuration pipeline slurry pressure, flow can indirect measurement concentration purpose, thereby solved the difficult problem of measuring of slurry multiphase flow concentration on the engineering, it is clear to have principle, method is easy, the precision height, device is simple, advantages such as easy operating.

Description of drawings

Fig. 1 is slurry of the present invention graph of a relation between energy consumption and the pipeline mean velocity when line transportation;

Fig. 2 be electromagnetic flowmeter and the time survey procedure relation figure;

Fig. 3 is a principle of the invention skeleton diagram;

Fig. 4 is that device of the present invention is arranged sectional arrangement drawing;

Fig. 5 is that device of the present invention is arranged schematic representation;

Fig. 6 is an A/D change-over panel circuit diagram;

Fig. 7 is device circuit figure of the present invention.

Among the figure: the even suspension area of 1-, the non-homogeneous suspension area of 2-, 3-pipe bottom moves floor district, the tractional load motion is promptly arranged, 4-plugging hazardous area, 5-muddy water curve, 6-clear water curve, 7-alternating voltage, 8-flow transducer, 9-flow sensing transducer, the 10-A/D plate, 11-process control machine, 12-data processing module, 13-matheematical equation computing module, 14,15-output accumulative total and statistics, help, inquiry, picture is handled, print, shelves read in file, module, 16-alarm module, 17-pressure transducer such as withdraw from, the 18-DC electrical source, the 19-dredging tube, 20-axle reamer, 21-bellows, the 22-dredge pump, the 23-supporting surface, 24-bearing support, 25-pressure transducer, the 26-sampling valve, the 28-I/V plate.

Mode of execution

The process control machine hardware environment

PC process control machine more than 486

Eight 32 road A/D plates

Software environment

. Chinese windows9x

Software mainly provides five aspect functions:

1, collection and statistical function

. during dredger work, image data is added up the output (having class to produce, daily output, monthly output, annual output) of dredging in real time;

. the real work of dredger and idle time (each class, day, month, year);

2, query function

Query function

Inquire about the class of appointment, day, month, the output in year;

. inquire about the class of appointment, day, month, the real work and the idle time in year;

3, warning function

. when exceeding default alarm concentration value, the concentration of mud in the dredger pipeline reports to the police;

4, automatic function

. read shelves during start automatically;

. enter corresponding date and order of classes or grades at school automatically; . to the time change shifts automatically;

. deposit automatically every a period of time;

5, other function

. show help information;

. show the schematic diagram of dredger;

. shortcut does not need mouse can operate yet;

Handling process

When 1, system just opens, read history file, import database, each global variable is set;

2, enter the incident wait state then, each dedicated functions module is activated by event-driven mechanism, still enters the incident wait state after executing every function respectively;

3, activate the shutdown system module by the guiding of shutdown system incident at last, withdraw from whole system.

Function is distributed

1, system control function

Initialization module is set;

System function module is set;

2, collection and statistical function

A/D data converted acquisition module is set;

Data transfer and computing module are set;

Query function

Enquiry module is set;

4, warning function

The load module of warning concentration is set;

Alarm module is set;

5, automatic function

The order of classes or grades at school modular converter is set;

Archive module is set;

A grade module is read in setting;

6, other function

The setting module that shows help information;

The schematic diagram module that shows dredger is set;

User interface

Adopt the GUI of extensive use, promptly such as window, menu, dialog box, scroll bar etc., master control interface is that data capture is single.

Main visual interface

Be a main user interface, comprised instant pipeline pressure, concentration, flow, output, the class of accumulative total produces, daily output, monthly output is produced per year.Also have the time of a system to comprise year in addition, month, day and the time, divide, second.The data per second upgrades once.

Software interface

Run on Windows95 and more highest version have on the operation system of win32API.

Hardware interface

Support general x86 series microcomputer, the A/D transition card.

Internal interface

. initial module: display cover, check that the sign that conforms to is arranged in the system registry, do not allow a plurality of example operations, otherwise withdraw from;

. system function module: receiving system functional zone corresponding event, start inquiry, the input of warning concentration, displaying principle figure shows help information, deposit, modules such as shutdown system;

.A/D data converted acquisition module: the special modality at the A/D transition card carries out data capture, return results;

. data transfer and computing module: calculate corresponding pressure, flow, concentration, output or the like data;

. enquiry module: a pop-up window, to given date or order of classes or grades at school, the class of returning, day, month, idle time is coexisted with in the output in year and real work peacefully;

. the load module of warning concentration: a pop-up window, import new alarm concentration value;

. alarm module: when actual concentrations surpasses warning concentration, report to the police;

. order of classes or grades at school modular converter: enter corresponding order of classes or grades at school, be presented on the data capture list;

. archive module: the data in the internal memory are write file;

. read a grade module: the data in the file are called in internal memory;

. module shows help information: a pop-up window has the essential information and the operational instruction of some native systems;

. show the schematic diagram module of dredger: a pop-up window, the schematic diagram of trace system.

Claims (6)

1. the device of measuring channel slurry body concentration and multiphase flow solid concentration, by primary transducer spare, transmitter, I/V transducer and computer are formed, it is characterized in that: described primary transducer spare is pressure transducer (25) and the flow transducer (8) that is installed on slurry and the multiphase flow conveyance conduit, be provided with the data capture modular converter (12) that is used to handle this pressure and flux signal in the computer, according to mathematical model Calculate the matheematical equation module (13) and the concentration module (16) of slurry and multiphase flow concentration; Described transmitter is pressure transmitter and flow sensing transducer; Converted to standard signal after the I/V transducer is input to computer through A/D converter again by measuring pressure and flux signal through transmitter; V in the formula ClearlyBe clear water mean velocity, V MuddyBe the muddy water mean velocity, Be muddy water flow minimizing value relatively, Y ClearlyBe clear water unit weight, Y HuskyBe silt unit weight, C TBe slurry concentration, Q MuddyBe muddy water flow value under the different pressures.
2. the method for measuring channel slurry body concentration and multiphase flow solid concentration, it is characterized in that: measuring channel slurry body concentration and multiphase flow solid concentration are by being preset in the mathematical model in the calculator Carry out, wherein muddy water flow minimizing value relatively R c' in contained different pressures muddy water flow minimizing value relatively Q MuddyWith muddy water mean velocity V MuddySampled signal from pressure transducer on the conveyance conduit and flow transducer; In computer, press formula C T* Q * S calculate the output of the slurry of surveying and multiphase flow solid concentration; C in the formula TBe slurry body concentration, Q is a slurry body flow under the certain pressure, and S is the time, Q MuddyBe muddy water flow value under the different pressures, V ClearlyBe clear water mean velocity, V MuddyBe the muddy water mean velocity, Be muddy water flow minimizing value relatively, Y ClearlyBe clear water unit weight, Y HuskyBe silt unit weight.
3. the method for measuring channel slurry body concentration according to claim 2 and multiphase flow solid concentration is characterized in that: described method is provided with the alarming value of adjustment to concentration, and scope is between 28~38%.
4. the method for measuring channel slurry body concentration according to claim 2 and multiphase flow solid concentration is characterized in that: described tested slurry unit weight Y mAccording to empirical correlation and the actual composition adjustment of silt, get Y usually m=2.65T/m 3
5. the device of measuring channel slurry body concentration according to claim 1 and multiphase flow solid concentration, it is characterized in that: described computer is the PC process control machine more than 486, eight A/D change-over panels are arranged, run under the Windows software environment, and have the above operation system of Win32API.
6. the device of measuring channel slurry body concentration according to claim 1 and multiphase flow solid concentration is characterized in that: described computer also can be single-chip microcomputer.
CNB011143347A 2001-07-06 2001-07-06 Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment CN1162640C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB011143347A CN1162640C (en) 2001-07-06 2001-07-06 Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB011143347A CN1162640C (en) 2001-07-06 2001-07-06 Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment

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Publication Number Publication Date
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CN1162640C true CN1162640C (en) 2004-08-18

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447537C (en) * 2004-09-24 2008-12-31 深圳市建恒工业自控系统有限公司 Dynamic transmission type capacity determining system and method
CN101255947B (en) * 2008-04-07 2012-02-01 成都康斯博科技有限责任公司 Metered system for automatically capturing fluid flux
CN102012329B (en) * 2010-11-22 2012-07-04 丹东东方测控技术有限公司 Ore pulp multiplexer
CN102182928B (en) * 2011-01-25 2012-12-12 云南大红山管道有限公司 Intelligent measuring system and method for transport volume of ore pulp pipes

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