CN1395055A - Method for measuring concentration of pipeline slurry body and multi-phase flow solid content and its equipment - Google Patents

Abstract

The present invention relates to a method for measuring concentration of slurry body in pipeline and multiphase flow solid phase content and its equipment. Its once conversion devices are pressure transducer and flow sensor, the interior of computer is equipped with data acquisition conversion module for processing said pressure and flow signal, mathematical equation calcualtion module for calcualting slurry body concentration and multiphase flow concentration and concentration alarm module. Said invention utilizes the resistance in the transmission pipeline and the characteristics of flow chagne regularity which can be changed with different concentration to indirectly measure concentration without concentration meter.

Description

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

One. technical field

The present invention relates to the determining method and the device of concentration and multiphase flow, especially a kind of method and device of measuring line transportation slurry concentration and multiphase flow solid concentration.

Two. 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 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 loses required precision easily and cause measuring failure because of being wrapped up by slurry or wearing and tearing.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, should 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 expense is higher, platform is 3.5 ten thousand 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.

Three. summary of the invention

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 solid concentration.

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, promptly have tractional load to move, and 4 districts are plugging hazardous areas.

In line transportation, always make slurry 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/ 0.25d ²Right, i.e. V ∝ Q _ClearlyFor muddy water, should follow quality and keep the weighing apparatus law under the condition that power equipment and pipe-line transportation system remain unchanged: promptly under the 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 Υ * Q=m.Υ is tested slurry unit weight 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=Υ _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=Υ _m* Q _Muddy=Υ _m(1-R _c') * Q _Clearly(4)

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

Υ _m(1-R _c') * Q _Clearly=Υ _Clearly* Q _Clearly(5)

Slurry unit weight Υ again _m=Υ _Clearly(1-C _T)+Υ _Husky* C _T(6)

(5)＝(6)

:

Work as Υ _Clearly=1.0T/m ³, Υ _Husky=2.65T/m ³The time (capacity of water, the unit weight of silt) substitution (7) formula: $C_T=(\frac{1}{1-R_c^{\text{'}}}-1)/1.65$

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≤Υ _m＜2.65T/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 different pressures, 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, Υ _mBe slurry unit weight, Υ _ClearlyBe clear water unit weight, Υ _HuskyBe silt unit weight, C _TBe slurry transportation 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 Υ in the formula (7) _ClearlyBe 1, silt unit weight Υ _HuskyBe 2.65T/m ³(silt general 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 transducer 25 on the slurry transportation pipeline and flow transducer 8, convert the standard electric signal to through pressure transmitter 17 and flow converter 9, 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 measurement 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, do not realize not densitometer and only need pass through the measuring channel slurry pressure, flow can be measured the purpose of concentration indirectly, thereby has solved the difficult problem of measuring of slurry multiphase flow concentration on the engineering.Have advantages such as principle is clear, method is easy, precision is high, device is simple, easy operating.

Four. 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: 1-evenly suspension area, 2-non-homogeneous suspension area, 3-pipe bottom moves floor district (the tractional load motion is arranged), 4-plugging hazardous area, 5-muddy water curve, 6-clear water curve, 7-alternating voltage, 8-flow transducer, 9-flow sensing transducer, 10-A/D plate, 11-process control machine, 12-data capture modular converter, 13-matheematical equation computing module, 14,15-output accumulative total and statistics, help, inquiry, picture is handled, print, shelves read in file, module such as withdraw from, 16-alarm module, 17-pressure transmitter, 18-DC electrical source, 19-dredging tube, 20-axle reamer, 21-bellows, 22-dredge pump, 23-supporting surface, 24-bearing support, 25-pressure transducer, 26-sampling valve, 27-sludge drainage pipe, 28-I/V plate.

Five. 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

Automatically read shelves during start;

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

Automatically deposit every a period of time;

5, other function

Show help information;

The schematic diagram that shows 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;

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

Flow transducer is selected the IFS400 electromagnetic flow transducer for use, and flow transmitter is selected corresponding SC100AS flow transmitter for use.Pressure transmitter is selected the CY series of pressure transmitters for use, and the model that the present invention selects for use is CY3011A.Computer is if adopt single-chip microcomputer, and then complete machine can be made portablely, and single-chip microcomputer should be produced 32 or 64 family chips with Intel Company and be advisable.

Data capture modular converter 12 receives pressure and flux signal electric current, delivery pressure value and flow value; Matheematical equation computing module 13 receives pressure and the flux signal of gathering, and calculates data such as corresponding pressure, flow, concentration, output, output concentration and yield values; Alarm module 16 cuits are warning concentration and actual concentrations, when actual concentrations surpasses warning concentration, and output concentration alarm signal.

Claims (7)

1. the method and the device of measuring channel slurry body concentration and multiphase flow solid concentration, by primary transducer spare, transmitter, A/D converter, I/V transducer and computer are formed, it is characterized in that: described primary transducer spare be installed on slurry and or the multiphase flow conveyance conduit on pressure transducer (25) and flow transducer (8), sent through change by measuring pressure and flux signal to convert standard signal to after A/D converter is input to computer; 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 computing module (13) and the concentration alarm module (16) of slurry and multiphase flow concentration.

2, the method for a kind of 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 C in the computer _T= 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; Q in the formula _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, Υ _mBe slurry unit weight, Υ _ClearlyBe clear water unit weight, Υ _HuskyBe silt unit weight, C _TBe the slurry transportation concentration.

3, according to the method and the device of claim 1 and 2 described measuring channel slurry body concentration and multiphase flow solid concentration, it is characterized in that: described method and apparatus is provided with adjustable alarming value to the concentration of measuring, and scope is between 28%～38%.

4, according to the method and the device of claim 1 and 2 described measuring channel slurry body concentration and multiphase flow solid concentration, it is characterized in that: described method and apparatus is pressed formula C in computer _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.

5, according to the method for claim 2 described measuring channel slurry body concentration and multiphase flow solid concentration, it is characterized in that: described tested slurry unit weight Υ _mAccording to empirical correlation and the actual composition adjustment of silt, get Υ usually _m=2.65T/m ³

6, according to the method and the device of claim 1 described measuring channel slurry body concentration 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 Chinese windows software environment, and have the above operation system of win 32 API.

7, according to the method and the device of claim 1 described measuring channel slurry body concentration and multiphase flow solid concentration, it is characterized in that: described computer also can be single-chip microcomputer.

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