JP2002257709A - Measuring instrument for measuring concentration and particle size of floating substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a concentration of a floating substance, and measure also an amount of the floating substance of a prescribed particle size contained in a measured fuid. SOLUTION: This measuring instrument for measuring a concentraion and a particle size of the floating substance is provided with measuring vessels cascade-connected multi-stagedly to store the measured fluid, flow-meters for measuring flow rates of the respective measured fluids stored in the respective measuring vessels, floating substance concentration measuring instrument main bodies provided in the respective measuring vessels to measure a floating substance-contaminated concentration of the measured fluid, and separators provided respectively between the measuring vessels to separate a prescribed particle size of the floating substances.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring the concentration of suspended solids and the amount of suspended solids having a predetermined particle size contained in a measurement fluid.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view of the structure of a conventional example generally used in the prior art, and is an example in which a suspended sand corresponds to a suspended solid in a dam, and is used for measuring the concentration of suspended solids mixed therein. FIG. 5 is a diagram illustrating the measurement principle of FIG.

In FIG. 4, reference numeral 1 denotes a differential pressure measuring device main body,
In this case, it is attached to the stand A and converts the input differential pressure between the high pressure and the low pressure into an electric signal and outputs it. The first pressure guiding tube 2 has one end connected to the high pressure side of the differential pressure measuring device main body 1 and the other end opened to a measurement fluid mixed with a floating substance.

[0004] One end of the second pressure guiding tube 3 is connected to the low pressure side of the differential pressure measuring device main body 1, and the other end is open to a measurement fluid containing a suspended substance. The arithmetic unit 4 calculates the average density of the measurement fluid in which the suspended substance is mixed from the differential pressure, and calculates the average density from the average density and the predetermined reference density of the measurement fluid in which the suspended substance is not mixed. Calculate the suspended solids concentration of the measurement fluid. In this case, arithmetic unit 4
Is built into the converter.

In the above configuration, the measurement principle of the apparatus will be described with reference to FIG. B is a water tank corresponding to a dam or a river in which the concentration of suspended solids is measured, and in this case, is filled with water.

Then, the first pressure guiding tube 2 and the second pressure guiding tube 3
Is inserted at a predetermined position of the water tank B. And
The distal end of the first impulse line 2 is inserted deeper into the water tank B by a distance H than the distal end of the second impulse line 3, and the inside of the second impulse line 3 and the first impulse line 2 are filled with water. Sealed or water purged.

In this case, the high pressure P1 and the low pressure P2 input to the differential pressure measuring device main body 1 are expressed by the following equations (1) and (2), respectively.
This is indicated by (2). P1 = ρH1−ρ0 (H1 + h1) + ρ0 (h1 + H1 + H−h4) + P0 (1) P2 = ρH2−ρ0 (H2 + h2) + ρ0 (h2 + H1 + H−h3) + P0 (2)

In the formulas (1) and (2), ρ: average density of water between the tip of the first impulse line 2 and the end of the second impulse line 3 in the water tank B ρ0: Density of sealing water sealed by the first pressure guiding tube 2 and the second pressure guiding tube 3 H: distance from the tip of the first pressure guiding tube 2 to the tip of the second pressure guiding tube 3

H1: Distance from the center of the diaphragm of the differential pressure measuring device main body 1 to the top of the water tank B H2: Distance from the tip of the second pressure guiding tube 3 to the top of the water tank B h1: First connection Main body 1 of differential pressure measuring device from tip of pressure tube 2
Distance to the center of the diaphragm

H2: distance from the end of the second impulse line 3 to the center of the diaphragm of the differential pressure measuring device main body 1 h3: from the top of the second impulse line 3 to the end of the second impulse line 3 H4: distance from the top of the first pressure guiding tube 2 to the tip of the second pressure guiding tube 3 P0: atmospheric pressure.

Then, H1-H2 = H, and h3 = h
4, the differential pressure measuring device main body 1 uses the differential pressure (P1-P) expressed by the following equation (3) from the above equations (1) and (2).
2) is detected by the diaphragm, and the detection signal is converted into an electric signal.

P1−P2 = H (ρ−ρ0) (3) Since H and ρ0 in Expression (3) are known values, the arithmetic unit 4 outputs the differential pressure signal (the differential pressure signal ) To calculate the average density ρ of water in equation (3).

The arithmetic unit 4 previously stores H, ρ0, and the reference density of water in which no suspended matter is mixed, as a known value. The difference between ρ and the stored reference density is calculated and output as an index of the concentration of suspended solids.

[0014]

However, in such an apparatus, the amount of suspended matter having a predetermined particle size contained in the measurement fluid cannot be measured.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a suspended substance concentration particle size measuring apparatus capable of measuring the concentration of suspended substance and measuring the amount of suspended substance having a predetermined particle size contained in a measurement fluid. Is to do.

[0016]

In order to achieve the above object, according to the present invention, in the apparatus for measuring the particle concentration of suspended solids according to the present invention, the measuring fluid is provided in cascade connection in multiple stages. Measurement tank, a flow meter for measuring the flow rate of the measurement fluid stored in the measurement tank, a floating substance concentration measuring device main body provided in the measurement tank for measuring the concentration of suspended solids in the measurement fluid, and the measurement tank And a separator for separating suspended substances having a predetermined particle size.

According to a second aspect of the present invention, there is provided an apparatus for measuring particle concentration of suspended solids, wherein a measuring tank for storing a measuring fluid, a flow meter for measuring a flow rate of the measuring fluid stored in the measuring tank, The apparatus further comprises: a suspended substance concentration measuring device main body for measuring a suspended substance mixed concentration of a measurement fluid; and a separator provided downstream of the measurement tank for separating suspended substances having a predetermined particle size, and the measurement fluid flowing out of the separator. Is returned to the measuring tank a predetermined number of times.

According to a third aspect of the present invention, there is provided an apparatus for measuring particle concentration of suspended solids according to the first or second aspect,
An arithmetic unit for calculating the weight of the suspended substance separated by the separator from the measurement signals of the flow meter and the suspended substance concentration measuring device main body is provided.

According to a fourth aspect of the present invention, in the apparatus for measuring particle concentration of suspended solids according to any one of the first to third aspects, the separator is separated from an upstream side to a downstream side of the apparatus. It is characterized in that the size of the predetermined granularity is set so as to be gradually reduced.

According to a fifth aspect of the present invention, in the apparatus for measuring suspended particle concentration and particle size according to any one of the first to fourth aspects, the suspension of the measurement fluid is determined from the weight of the suspended substance separated by the separator. An indicator for displaying the particle size distribution of the substance is provided.

According to a sixth aspect of the present invention, in the apparatus for measuring the concentration and concentration of suspended solids according to any one of the first to fifth aspects, a filter is used as the separator.

According to a seventh aspect of the present invention, in the apparatus for measuring the particle concentration of suspended solids according to the sixth aspect, an auto-clean filter is used as the filter.

According to an eighth aspect of the present invention, in the apparatus for measuring the concentration and concentration of suspended solids according to any one of the first to seventh aspects, an electromagnetic flowmeter is used as the flowmeter. .

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of a main part configuration of an embodiment of the present invention, showing an example used for measuring suspended sand concentration / particle size distribution. FIG. 2 is an explanatory diagram of the operation of FIG. In the figure,
4 have the same functions. Hereinafter, only differences from FIG. 4 will be described.

In the figure, a pump PU1 is connected to a measuring fluid source.
The measuring fluid FL is drawn from C. The first, second, and third measurement tanks TA1, TA2, and TA3 are provided in a cascade connection in multiple stages, and store the measurement fluid FL drawn from the measurement fluid source A.

The flow meters F1, F2 and F3 are connected to a measuring tank TA.
The flow rates of the measurement fluid FL drawn into 1, TA2, and TA3 are respectively measured. In this case, an electromagnetic flowmeter is used as the flowmeter.

Suspended substance concentration measuring apparatus main body M1, M2, M
Reference numeral 3 is provided in each of the measurement tanks TA1, TA2, and TA3, and measures the concentration of suspended solids in the measurement fluid FL. The separators S1 and S2 are provided between the measuring tanks TA1, TA2 and TA3, and each separate a suspended substance having a predetermined particle size.

In this case, the separators S1 and S2 are set so that the size of a predetermined particle size separated from the upstream side to the downstream side of the apparatus becomes smaller in order. In this case, for example, the separator S1 is 100 μm or more, and the separator S2 is 10 μm or more.
Separate to a particle size of 0 μm to 10 μm.

In this case, filters are used as the separators S1 and S2, and an auto-clean filter is used. The arithmetic units C1, C2, and C3 are composed of the flow meters F1, F2, and F3 and the suspended matter concentration measuring device main body M1,
From the measurement signals of M2 and M3, the respective separators S
Calculate the weight of suspended solids separated in 1 and S2.

The display D is provided with respective separators S1 and S2.
The particle size distribution of the suspended substance of the measurement fluid is displayed from the suspended substance weight separated by the above. The separator S0 is connected to the pump PU1.
And a flow meter F1 for removing coarse suspended substances in advance.

The pump PU2 includes a separator S0 and a flow meter F1.
And sends the measurement fluid FL to the measurement tank TA1. The pump PU3 is provided between the separator S1 and the flow meter F2, and is supplied to the measurement tank TA2 based on an instruction of the liquid level controller LC1 attached to the measurement tank TA1.
Send L.

The pump PU4 includes a separator S2 and a flow meter F3.
And sends the measurement fluid FL to the measurement tank TA3 based on an instruction from the liquid level controller LC2 attached to the measurement tank TA2.

The pump PU5 is provided in the suspended substance concentration measuring device main body M3, and discharges the measurement fluid FL in the measurement tank TA3 based on an instruction from the liquid level controller LC3 attached to the measurement tank TA3.

In the above configuration, from the measurement fluid source C,
The measurement fluid FL is drawn in by the pump PU1, and the measurement fluid FL is stored in the first measurement tank TA1. The suspended substance concentration of the measurement fluid FL is measured by the suspended substance concentration measuring device main body M1 in the first measurement tank TA1.

Next, the measuring fluid FL containing the suspended suspended sand is drawn out from the bottom of the first measuring tank TA1 and separated from the separator S1.
, The measurement fluid FL containing only those having a particle diameter of d1 or less is transferred to the second measurement tank TA2.

The suspended substance concentration of the measurement fluid FL is measured by the suspended substance concentration measuring device main body M2 in the second measuring tank TA2. Next, from the bottom of the second measurement tank TA2, the measurement fluid FL containing the suspended suspended sand is drawn out, and the separator S
Through 2, the measuring fluid FL containing only those having a particle size of d2 or less is transferred to the third measuring tank TA3.

The suspended substance concentration of the measurement fluid FL is measured by the suspended substance concentration measuring device body M3 in the third measuring tank TA3. As described above, the unit of the measuring tank TA, the suspended matter concentration measuring device main body M, the separator S, and the flow meter F,
By increasing the number as needed, the particle size distribution of suspended sand can be measured by the display D as shown in FIG.

That is, the measurement fluid FL is drawn in from the measurement fluid source A through the separator S1 by the pump PU1. The flow rate Q1 of the measurement fluid FL including suspended sand is measured by the flow meter F1.
Is measured. When the measured value α1 of the concentration of the suspended sand is known by the suspended matter concentration measuring device main body M1 in the measurement tank TA1, the weight W1 of the suspended sand flowing into the measurement tank TA1 = Q1 · α1 of the suspended sand measured in the measurement tank TA1. Particle size d <d1

Weight W2 of suspended sand flowing into measuring tank TA2
= Q2 · α2 Particle size d <d2 <d1 of suspended sand measured in the measuring tank TA2 Amount of suspended sand from the particle size d1 to d2 (Q1 · α1-Q2
・ Α2)

Weight W3 of suspended sand flowing into measuring tank TA3
= Q3 · α3 The particle size d <d3 <d2 of the suspended sand measured in the measuring tank TA2.
・ Α3)

As a result, (1) a suspended substance concentration particle size measuring apparatus capable of measuring the concentration of suspended substances and measuring the amount of suspended substances having predetermined particle sizes d1 and d2 contained in the measurement fluid is obtained.

(2) Since the computing units C1, C2, and C3 are used, a suspended substance concentration particle size measuring apparatus capable of measuring the amount of suspended substance having a predetermined particle size in real time is obtained.

(3) An apparatus for measuring the concentration of suspended solids can be obtained in which suspended solids can be easily separated in the order of particle size for each of the predetermined particle sizes d1, d2, and d3.

(4) An apparatus for measuring the particle size of a suspended substance which can easily display the particle size distribution of the suspended substance in the measurement fluid in real time can be obtained.

(5) A filter S, not a centrifuge, etc.
Since S1 and S2 are used, the filter is inexpensive, and a suspended substance concentration particle size measuring apparatus capable of inexpensively separating suspended substances can be obtained.

(6) Auto clean filters S1, S2
Was used, the filter was automatically cleaned, and a particle size measuring device for suspended substance concentration which was easy to operate continuously was obtained.

(7) Since the electromagnetic flowmeters F1, F2, and F3 are used, the electromagnetic flowmeter has no obstruction in the measuring tube,
It is possible to obtain a particle size measuring apparatus for measuring the concentration of suspended solids which is less likely to cause a flow rate measurement error due to clogging, adhesion and collision of suspended solids.

(8) When this apparatus is used continuously, it is possible to know in real time what kind of particle size distribution of suspended solids flows in a measuring fluid such as a flowing river. That is, a suspended substance concentration particle size measuring apparatus capable of continuously measuring the concentration and the particle size distribution of the suspended substance in the flow can be obtained.

FIG. 3 is an explanatory view of a main part configuration of another embodiment of the present invention. In this embodiment, the flow meter F1 and the measuring tank T
A1, the suspended substance concentration measuring device main body M1 is repeatedly used for each one, and the flow meter F1, the measuring tank TA1,
In this embodiment, a plurality of suspended substance concentration measuring apparatus main bodies M1 are used.

The measurement fluid FL is R1 indicated by a solid line at first.
, Then follow the path of R2 indicated by the dotted line, and finally, switch to the filter S2 and follow the path of R1 indicated by the dashed line.

It is possible to reduce the number of flowmeters, measuring tanks and suspended substance concentration measuring devices, and in particular, to reduce expensive measuring instruments, and to obtain a suspended substance concentration and particle size measuring apparatus which is inexpensive and has a good space factor.

In the above embodiment, the flow meter F
1, F2, F3, ..., measuring tanks TA1, TA2, TA
3,..., Suspended matter concentration measuring device main body M1, M2, M3
.., And separators S1, S2,.

However, for example, the flow meter F1, the measuring tank TA
1. After the first stage of measurement is completed using one each of the suspended substance concentration measuring device main body M1 and the separator S1, the flow meters F2 and F3, the measuring tanks TA2 and TA3, the suspended substance concentration measuring device Instead of the main bodies M2 and M3 and the separator S2, a flow meter F
1. The measuring tank TA1, the suspended matter concentration measuring device main body M1, and the separator S1 may be used again. In addition, it goes without saying that the separation particle size of the separator S1 is changed every stage.

In this way, the cost is lower and
An apparatus for measuring the concentration of suspended solids having a good space factor can be obtained.

It should be noted that the foregoing description has been directed to specific preferred embodiments for the purpose of illustration and illustration of the invention. Therefore, the present invention is not limited to the above-described embodiment, but includes many more changes and modifications without departing from the spirit thereof.

[0056]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. The concentration of suspended solids can be measured, the amount of suspended solids of a predetermined particle size contained in the fluid to be measured can be measured, and an apparatus for measuring the concentration of suspended solids that can be measured more easily can be obtained.

According to the second aspect of the present invention, the following effects can be obtained. The concentration of suspended solids can be measured, the amount of suspended solids of a predetermined particle size contained in the measurement fluid can be measured, and an inexpensive suspended solid concentration particle size measuring device with a good space factor can be obtained.

According to the third aspect of the present invention, the following effects can be obtained. Since the arithmetic unit is used, a floating substance concentration particle size measuring device capable of measuring the amount of the floating substance having a predetermined particle size in real time is obtained.

According to the fourth aspect of the present invention, the following effects can be obtained. An apparatus for measuring the concentration of suspended solids, which can easily separate the suspended solids in the order of the magnitude of the particle size for each predetermined particle size, is obtained.

According to the fifth aspect of the present invention, the following effects can be obtained. (1) A floating substance concentration particle size measuring apparatus capable of easily displaying the particle size distribution of the floating substance of the measurement fluid in real time can be obtained.

(2) When the present apparatus is used continuously, it is possible to roughly know in real time what particle size distribution of suspended solids flows in a measuring fluid such as a flowing river. That is, a suspended substance concentration particle size measuring apparatus capable of continuously measuring the concentration and the particle size distribution of the suspended substance in the flow can be obtained.

According to the sixth aspect of the present invention, the following effects can be obtained. Since a filter is used instead of a centrifugal separator or the like, the filter is inexpensive, and a suspended substance concentration particle size measuring apparatus capable of inexpensively separating suspended substances can be obtained.

According to the seventh aspect of the present invention, the following effects can be obtained. Since the auto clean filter was used,
The filter is automatically cleaned and a particle size measuring apparatus for the suspended substance concentration which can be easily operated continuously is obtained.

According to the eighth aspect of the present invention, the following effects can be obtained. Since an electromagnetic flowmeter was used, the electromagnetic flowmeter had no obstructions in the measurement tube and clogged, adhered,
An apparatus for measuring the particle size and concentration of suspended solids which is less likely to cause a flow rate measurement error due to collision is obtained.

Therefore, according to the present invention, it is possible to realize a suspended substance concentration particle size measuring apparatus capable of measuring the concentration of suspended substance and measuring the amount of suspended substance having a predetermined particle size contained in a measurement fluid.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of FIG. 1;

FIG. 3 is an explanatory view of a main part configuration of another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

FIG. 5 is a diagram illustrating the measurement principle of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential pressure measuring device main body 2 1st impulse line 3 2nd impulse line 4 Computing unit A Stand B Water tank C Measurement fluid source C1 Computing unit C2 Computing unit C3 Computing unit D Display F1 Flow meter F2 Flow meter F3 Flow meter FL Measurement fluid LC1 Liquid level controller LC2 Liquid level controller LC3 Liquid level controller M1 Floating substance concentration measuring apparatus main body M2 Floating substance concentration measuring apparatus main body M3 Floating substance concentration measuring apparatus main body PU1 Pump PU2 Pump PU3 Pump PU4 Pump PU5 Pump S0 Separator S1 Separator S2 Separator TA1 First measuring tank TA2 Second measuring tank TA3 Third measuring tank

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Ochi 2-9-132 Nakamachi, Musashino City, Tokyo Inside Yokogawa Electric Corporation

Claims (8)

[The claims] 1. A measuring tank provided in a multi-stage cascade connection and storing a measuring fluid, a flow meter for measuring a flow rate of the measuring fluid stored in the measuring tank, A suspended substance concentration particle size measuring apparatus, comprising: a suspended substance concentration measuring apparatus main body for measuring the concentration of suspended substance mixed therein; and a separator provided between the measurement tanks for separating suspended substance having a predetermined particle size. 2. A measuring tank for storing a measuring fluid, a flow meter for measuring a flow rate of the measuring fluid stored in the measuring tank, and a floating substance concentration provided in the measuring tank for measuring a concentration of a floating substance mixed in the measuring fluid. A measuring device main body, and a separator provided downstream of the measuring tank for separating suspended substances having a predetermined particle size, wherein the measuring fluid flowing out of the separator is returned to the measuring tank a predetermined number of times. Characteristic particle size analyzer for suspended solids. 3. An arithmetic unit for calculating a weight of the suspended substance separated by the separator from a measurement signal of the flow meter and the main body of the suspended substance concentration measuring device.
An apparatus for measuring the concentration of suspended solids according to claim 1 or 2. 4. The apparatus according to claim 1, wherein a plurality of said separators are used, and said predetermined particle size separated from an upstream side of said apparatus to a downstream side thereof is set so as to decrease sequentially. 4. The suspended solid concentration particle size measuring apparatus according to any one of 3. 5. The display according to claim 1, further comprising a display for displaying a particle size distribution of the suspended substance of the measurement fluid from the weight of the suspended substance separated by the separator. An apparatus for measuring suspended solids concentration and particle size as described above. 6. The particle size measuring apparatus according to claim 1, wherein a filter is used as the separator. 7. The apparatus according to claim 6, wherein an auto-clean filter is used as said filter. 8. The apparatus according to claim 1, wherein an electromagnetic flowmeter is used as said flowmeter.