JP2002350315A - Suspended solids quantity measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient measuring device which can measure the quantity of suspended solids. SOLUTION: The suspended solids quantity measuring device is charecterized by that it is provided with a measuring tank wherein the suspended solid-mixed fluid is stored, a feeder pump feeding the suspended solids-mixed fluid into the measuring tank, a first flowmeter measuring the quantity of the suspended solid-mixed fluid flown in the measuring tank, a suspended solids density measuring device installed in the tank for measuring the mixing concentration of the suspended solids-mixed fluid, an injector pump pouring a diluted suspended solids-mixed fluid into the measuring tank, a second flowmeter measuring the injection rate of the diluted suspended solids-mixed fluid, and a control device controlling operations of both the feeder/injector pumps based on each measurement signal for the suspended solids concentration measuring device, the first flowmeter and the second flowmeter so as to allow the mixing concentration of the suspended solids-mixed fluid in the measuring tank to be a prescribed concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the amount of suspended solids which can measure the amount of suspended solids and which is efficient.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of the structure of a conventional floating substance concentration measuring apparatus generally used in the prior art, which is used in a dam to measure the concentration of suspended solids when suspended sand corresponds to suspended substances. This is an example. FIG. 4 is a diagram showing the measurement principle of FIG.

In FIG. 3, 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 and the predetermined density of the measurement fluid in which the suspended substance is not mixed. From this, the suspended substance concentration of this measurement fluid is calculated. In this case, the arithmetic unit 4 is built in the converter.

[0006] In the above configuration, the measurement principle of the suspended solid concentration measuring 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.

[0007] The first impulse line 2 and the second impulse line 3 are
It is inserted at a predetermined position in the water tank B. 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 equations (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 tip 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 Equation (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 stores in advance H, ρ0, and the reference density of water in a state in which suspended matter is not mixed, as a known value, and the arithmetic unit 4 calculates the calculated average density of water. The difference between ρ and the stored reference density is calculated and output as an index of the concentration of suspended solids.

[0015]

Here, there is a concept that the sediment in the fluid containing the suspended substance and the accumulated suspended substance are mixed with the fluid containing the suspended substance to be used for discharge. It is effective when sand is to be mixed with water to discharge.

In this case, the amount of suspended sand effectively discharged only by mixing the suspended sand with the water and discharging, and the suspended matter is liable to precipitate due to the high concentration, and the concentration of the suspended matter is effective. Yes, and they cannot maintain effective emission concentrations.

An object of the present invention is to solve the above-mentioned problems and to provide an apparatus for measuring the amount of suspended solids which can measure the amount of suspended solids and which is efficient.

[0018]

In order to achieve the above object, according to the present invention, there is provided an apparatus for measuring the amount of suspended solids, comprising: a measuring tank for storing a fluid mixed with suspended solids;
A feed pump for sending the floating substance-mixed fluid to the measurement tank, a first flow meter for measuring the amount of the floating substance-mixed fluid flowing into the measurement tank, and the floating substance mixing fluid provided in the measurement tank. A floating substance concentration measuring device for measuring the suspended substance mixed concentration of the fluid, an injection pump for injecting the diluted floating substance mixed fluid into the measurement tank, and a second measuring the injection amount of the diluted suspended substance mixed fluid. And the feed / injection pump based on measurement signals from the suspended substance concentration measuring device and the first and second flow meters so that the concentration of the suspended substance mixed fluid in the measurement tank becomes a predetermined concentration. And a control device for controlling the operation of (1).

In the apparatus for measuring the amount of suspended solids according to the second aspect of the present invention, an adjusting tank in which a fluid mixed with suspended solids is stored in advance;
A measuring tank in which a suspended substance-mixed fluid is stored, a feed pump for sending the suspended substance-mixed fluid from the adjustment tank to the measurement tank, and a flow meter for measuring an amount of the suspended substance-mixed fluid flowing into the measurement tank A floating substance concentration measuring device provided in the measurement tank for measuring the concentration of the floating substance mixed in the floating substance mixed fluid; an injection pump for injecting the diluted floating substance mixed fluid into the adjustment tank; And a controller for controlling the operation of the feed / injection pump based on the measurement signal of the flow meter so that the concentration of the fluid mixed with the floating substance becomes a predetermined concentration. I do.

According to a third aspect of the present invention, in the apparatus for measuring the amount of suspended solids according to the first or second aspect, the amount of suspended solids is determined from a measurement signal of the flow meter and a measurement signal of the concentration of suspended solids. It is characterized by having a computing unit for computing.

According to a fourth aspect of the present invention, in the apparatus for measuring the amount of suspended solids according to any one of the first to third aspects, an electromagnetic flowmeter is used as the flowmeter.

[0022]

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 of an embodiment of the present invention, showing an example of a dam used as a suspended sand amount measuring device in a case where accumulated suspended sand is mixed with water and discharged in a dam. In the figure, the configuration of the same symbol as in FIG. 3 indicates the same function. Hereinafter, only differences from FIG. 3 will be described.

In the figure, reference numeral 11 denotes a measuring tank for storing a fluid mixed with suspended substances. In this case, the suspended matter is suspended sand. In this case, the measuring tank 11 has a structure that overflows when the suspended substance-mixed fluid reaches a predetermined water level. That is, the weir 111 is provided in the measurement tank 11.

Reference numeral 12 denotes a feed pump for sending a fluid containing suspended substances to the measuring tank 11. In this case, the feed pump 1
No. 2 takes in water with a high concentration of suspended sand from reservoir C of the dam.

Reference numeral 13 denotes a first flow meter for measuring the amount of the suspended substance-containing fluid flowing into the measuring tank 11. In this case, an electromagnetic flow meter is used.

Reference numeral 14 denotes a floating substance concentration measuring device provided in the measuring tank 11 for measuring the concentration of the floating substance mixed in the fluid mixed with the floating substance. Reference numeral 15 denotes an injection pump for injecting the diluted suspended substance mixed fluid into the measurement tank 11.

In this case, water mixed with suspended sand of low concentration is taken in from the river D near the dam. Reference numeral 16 denotes a second flow meter for measuring the injection amount of the diluted suspended substance-containing fluid. In this case, an electromagnetic flow meter is used.

Reference numeral 17 denotes a floating substance concentration measuring device 1 so that the concentration of the fluid mixed with the floating substance in the measuring tank 11 becomes a predetermined concentration.
4, a control device for controlling the operation of the pumps 12, 15 based on the measurement signals of the first and second flow meters 13 and 16.

Reference numeral 18 denotes a display / transmission unit which displays a measurement value of the suspended substance concentration measuring device 14 and transmits a measurement signal of the suspended substance concentration measuring device 14 to the control unit. The measurement signals of the flow meters 13 and 16 and the suspended solid concentration measurement device 1
In this case, a calculator for calculating the amount of suspended solids from the measurement signal of No. 4 is built in the control device 17.

In the above configuration, the water containing suspended sand is
From the reservoir A of the dam to the measuring tank 11 by the water pump 12
Guided inside. The flow rate is measured by the first flow meter 13.

On the other hand, the diluted suspended substance-mixed fluid is injected into the measuring tank 11 by the injection pump 15. In the measuring tank 11, the concentration of water containing suspended sand is measured by the suspended solid concentration measuring device 14.

The suspended sand concentration in the measuring tank 11 is controlled by the controller 17.
Is controlled to a constant predetermined density. The measured water containing suspended sand overflows from the weir 11 provided in the measuring tank 11, is guided to the outlet, and is discharged. In this way, the amount of suspended sand discharged can be measured based on the flow rate and the concentration. That is, the amount of suspended sand discharged can be obtained as a numerical value.

As a result, (1) By measuring the flow rate and concentration of water containing high-concentration suspended sand, the amount of high-concentration suspended sand can be obtained, and the total amount of discharged high-concentration suspended sand can be calculated. An apparatus for measuring the amount of suspended solids that can be known is obtained.

(2) When discharging water containing a high concentration of suspended sand, the concentration of the suspended sand is measured and discharged at a concentration lower than a certain reference value, so that the concentration of suspended sand in the downstream river water is kept below a certain value. Thus, an apparatus for measuring the amount of suspended solids that can suppress adverse effects on the environment can be obtained.

(3) By grasping the concentration of suspended sand flowing out downstream, the suspended sand concentration of the entire downstream river is estimated, and the product of the suspended sand concentration of the entire river and its elapsed time is used as one index. An apparatus for measuring the amount of suspended solids that can be controlled so as to minimize the effect on the environment is obtained.

(4) Since an arithmetic unit for calculating the amount of suspended solids is used from the measurement signal of the flow meter and the measurement signal of the suspended solid concentration measuring device, an apparatus for measuring the amount of suspended solids in real time can be provided. can get.

(5) Since the electromagnetic flow meter is used as the flow meter, a floating substance amount measuring apparatus which does not cause a measurement error even when the suspended substance mixed fluid contains a slurry or a small solid substance can be obtained.

FIG. 2 is an explanatory view of a main part configuration of another embodiment of the present invention. In the present embodiment, water mixed with high-concentration suspended sand is taken into the adjusting tank 21 from the reservoir A of the dam by the dredging pump 22.

The feed pump 23 sends the fluid containing suspended substances from the adjusting tank 21 to the measuring tank 11. The injection pump 24 injects the diluted suspended substance-mixed fluid into the adjustment tank 21. The control device 25 controls the feeding, injecting pump 23,
24 is controlled.

As a result, the number of expensive flow meters 16 can be reduced, and an inexpensive suspended solids amount measuring device can be obtained.

In the above embodiment, the measuring tank 1 was used.
Although 1 has been described as having the weir 111, the present invention is not limited to this, and it is only necessary that the measuring tank be a storage tank that stores the fluid mixed with suspended substances.

It is to be noted that the above description has shown only specific preferred embodiments for the purpose of explanation and illustration of the present 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.

[0043]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. (1) By measuring the flow rate and concentration of the high-concentration suspended substance-containing fluid, the amount of the high-concentration suspended substance-containing fluid can be obtained, and the total amount of the discharged high-concentration suspended substance can be known. An apparatus for measuring the amount of suspended solids is obtained.

(2) When discharging a fluid having a high concentration of suspended solids, the concentration is measured and the concentration of the suspended solids is reduced by discharging the fluid at a concentration lower than a predetermined reference value. Thus, an apparatus for measuring the amount of suspended solids that can be suppressed to a value equal to or less than the value and the adverse effect on the environment can be obtained.

(3) By determining the concentration of suspended solids flowing downstream, the concentration of suspended solids in the entire downstream river is estimated, and the product of the concentration of suspended solids in the entire river and the elapsed time is 1
One indicator is to minimize environmental impact,
An apparatus for measuring the amount of suspended solids that can be controlled is obtained.

According to the second aspect of the present invention, the following effects can be obtained. An expensive flow meter can be reduced, and an inexpensive suspended solids amount measuring device can be obtained.

According to the third aspect of the present invention, the following effects can be obtained. Since an arithmetic unit for calculating the amount of suspended solids from the measurement signal of the flow meter and the measurement signal of the suspended solid concentration measuring device is used, a suspended solid amount measuring device capable of measuring the amount of suspended solids in real time is obtained.

According to the fourth aspect of the present invention, the following effects can be obtained. Since an electromagnetic flowmeter was used as the flowmeter,
An apparatus for measuring the amount of suspended solids which does not cause a measurement error even when the fluid containing suspended solids contains a slurry or a small solid substance is obtained.

Therefore, according to the present invention, the amount of suspended solids can be measured and an apparatus for measuring the amount of suspended solids with high efficiency can be realized.

[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 explanatory view of a main part configuration of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

FIG. 4 is a measurement principle diagram of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential pressure measuring device main body 2 1st impulse line 3 2nd impulse line 4 Computing unit 11 Measurement tank 111 Weir 12 Inlet pump 13 First flow meter 14 Floating substance concentration measuring device 15 Injection pump 16 Second flow rate Total 17 Control unit 18 Display / Transmission unit 21 Adjustment tank 22 Dredge pump 23 Inlet pump 24 Injection pump 25 Control unit A Stand B Water tank C Dam reservoir D River

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F035 AA03 2G052 AA06 AB00 AC03 AC06 AC12 AD09 AD29 AD49 BA05 BA14 CA02 CA04 CA08 CA12 CA29 CA36 CA38 DA00 DA22 GA21 HA01 HA15 HB10 HC04 HC24 HC28 HC38 HC44 JA09 JA23

Claims (4)

[Claims] 1. A measuring tank for storing a floating substance mixed fluid, a feed pump for sending the floating substance mixed fluid to the measuring tank, and a measuring tank for measuring an amount of the floating substance mixed fluid flowing into the measuring tank. A flow meter of 1, a floating substance concentration measuring device provided in the measuring tank for measuring a floating substance mixed concentration of the floating substance mixed fluid, and an injection pump for injecting the diluted floating substance mixed fluid into the measuring tank. A second flowmeter for measuring an injection amount of the diluted suspended substance-containing fluid; and a floating substance concentration measuring device, the first and the second components, such that the concentration of the suspended substance-containing fluid in the measurement tank becomes a predetermined concentration. Second
A controller for controlling the operation of the feed / injection pump based on the measurement signal of the flowmeter. 2. An adjusting tank in which a floating substance mixed fluid is stored in advance, a measuring tank in which a floating substance mixed fluid is stored, a feed pump for sending the floating substance mixed fluid from the adjusting tank to the measuring tank, A flowmeter for measuring an amount of the suspended-substance-mixed fluid flowing into the tank; a suspended-substance-concentration measuring device provided in the measurement tank to measure a suspended-substance-concentrated concentration of the suspended-substance-mixed fluid; An injection pump for injecting the suspended-floating substance-mixed fluid, and the inflow and outflow based on the measurement signals from the suspended-substance-concentration measuring device and the flowmeter so that the concentration of the floating-substance-mixed fluid in the adjustment tank becomes a predetermined concentration. A floating substance amount measuring device, comprising: a control device for controlling an operation of an infusion pump. 3. The floating substance according to claim 1, further comprising an arithmetic unit for calculating a floating substance amount from a measurement signal of the flow meter and a measurement signal of the floating substance concentration measuring device. Quantity measuring device. 4. An apparatus according to claim 1, wherein an electromagnetic flowmeter is used as said flowmeter.