JPH10282084A - Viscosity mixing ratio meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the viscosity of a mixed liquid and the mixing ratio with water accurately by making constant the flow rate of an emulsified mixed liquid of water and oil and operating the viscosity from the pressure difference of a thin tube passing the mixed liquid whereas operating the ratio of water from the heating temperature difference of the mixed liquid. SOLUTION: A fixed volume pump 1, a thin tube 2 and a heater 3 are arranged in series and pressure gauges 5, 6 are provided at the inlet and outlet of the thin tube 2 while thermometers 8, 9 are provided at the inlet and outlet of the heater 3. A first operating unit 7 is previously inputted with the radius R and the length L of the thin tube 2 and the flow rate Q of an emulsified mixed liquid of water and oil is predetermined by the fixed volume pump 1. Consequently, the absolute viscosity η of an emulsion fuel can be operated according to formula I when the inlet and outlet pressures P1, P2 of the thin tube 2 are introduced. A second operating unit 10 is previously inputted with the specific heat λw of water, the specific heat λo of fuel, the flow rate Q and the heat quantity H. Consequently, the ratio of water α can be operated according to formula II when the inlet and outlet temperatures T1, T2 of the heater 3 are introduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscosity mixing ratio meter for measuring the viscosity of a mixture of emulsified water and oil and the ratio of water.

[0002]

2. Description of the Related Art Recently, in order to reduce nitrogen oxides in exhaust gas discharged from a diesel engine, a mixed liquid of emulsified water and fuel oil is sometimes supplied to the diesel engine as fuel. Generally, the fuel (heavy oil) supplied to a diesel engine is controlled so that its viscosity falls within a certain range, and when the viscosity is higher than a standard, the fuel is heated to fall within a required viscosity range. . The heating temperature is calculated in advance from the analyzed viscosity of the fuel.
A diagram for this is available as a viscosity / temperature diagram.
A viscometer may be used to measure the viscosity. In this case, the heating temperature is adjusted based on the value measured by the viscometer.

On the other hand, when supplying a mixed liquid of emulsified water and fuel to a diesel engine, it is necessary to control the ratio of water to fuel. At this time, if the ratio of emulsified water to fuel can be directly measured, the control becomes accurate and the control system can be simplified. However, many commercially available moisture meters have a measurement range of 1% or less, and there is no moisture meter that can measure moisture content of several tens%.

As described above, conventionally, the mixing ratio of water and fuel in the emulsion fuel supplied to the diesel engine is controlled by controlling the supply flow rate, and the heating temperature of the fuel supplied to the diesel engine is determined in advance. This is performed by either calculating from the analyzed viscosity of the fuel or by monitoring the viscometer and adjusting the heating temperature to obtain an appropriate viscosity.

[0005] Therefore, since the water content and the viscosity of the emulsion fuel are measured by different instruments, not only does the price rise, but also the apparatus becomes complicated and the installation on a diesel engine becomes difficult.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and is intended to reduce the viscosity of a mixture of emulsified water and oil and the ratio of water to a relatively simple one. An object of the present invention is to provide a viscosity mixing ratio meter that can accurately measure with one device.

[0007]

According to a first aspect of the present invention, there is provided a viscosity mixing ratio meter for controlling a flow rate of a mixed liquid of emulsified water and oil, and a flow rate control apparatus for controlling a flow rate of the mixed liquid. A thin tube having a predetermined radius and a tube length through which the restricted mixture is passed, pressure gauges respectively installed at the inlet and the outlet of the narrow tube, and a first method for calculating the viscosity of the mixture from the pressure difference between the two pressure gauges. An arithmetic unit, a heater for heating the mixed liquid whose flow rate is controlled by the flow control device, thermometers respectively installed at the inlet and the outlet of the heater, and a water ratio based on a temperature difference between the two thermometers. And a second computing device for performing computation.

According to the first aspect of the present invention, the flow rate Q of the mixture of emulsified water and oil is determined by the flow rate control device, and the radius R and length L of the thin tube are known. If the pressure difference at the outlet (P1−P2) is known, the absolute viscosity η of the emulsion can be obtained from the Poiseuille equation. η = π / 8 (P1−P2) / Q / R ⁴ / L

On the other hand, since the specific heat λw of the heater and the specific heat λo of the fuel are known, the temperature difference between the inlet and the outlet of the heater (T2−T2) If T1) is known, the ratio of water α
Can be requested. α = (H / (T2−T1) / Q−λo) / (λw−λ
o)

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a viscosity mixing ratio meter according to the present invention, in which a metering pump 1, a thin tube 2 having a predetermined radius R and a tube length L, and a heater 3 are arranged from upstream to downstream.
Are arranged in series. These devices 1, 2, 3
The pipes 4 communicate with each other. Further, a first pressure gauge 5 is installed at the inlet of the thin tube 2 and a second pressure gauge is installed at the outlet thereof.
Pressure gauge 6 is installed. The first arithmetic unit 7 connected to the two pressure gauges 5 and 6 calculates the absolute viscosity η from Poiseuille's equation represented by the following equation (1).

On the other hand, a first thermometer 8 is provided at the inlet of the heater 3 and a second thermometer 9 is provided at the outlet thereof. The second arithmetic unit 10 connected to the two thermometers 8 and 9 calculates the water ratio α from the following equation (2). Next, the operation of the above-mentioned viscosity mixing ratio meter will be described. The radius R and the tube length L of the thin tube 2 are input to the first arithmetic unit 7 in advance. The flow rate Q of the mixture of the emulsified water and the fuel oil is also determined by the metering pump 1.

Therefore, when the inlet pressure P1 of the thin tube 2 measured by the first manometer 5 and the outlet pressure P2 of the thin tube 2 measured by the second manometer 6 are introduced into the arithmetic unit 7, the first pressure The arithmetic unit 7 calculates the absolute viscosity η of the emulsion fuel from the Poiseuille equation shown in the equation (1).

That is, η = π / 8 (P1−P2) / Q / R ⁴ / L (1) On the other hand, the second arithmetic unit 10 previously stores the specific heat λw of water,
The specific heat λo of the fuel, the flow rate Q of the mixed liquid, and the heating heat H of the heater are input.

Therefore, the inlet temperature T1 of the heater 3 measured by the first thermometer 8 and the outlet temperature T2 of the heater 3 measured by the second thermometer 9 are determined by the second arithmetic unit 10
Is calculated by the second arithmetic unit 10 from the following equation (2).

That is, α = (H / (T2−T1) / Q−λo) / (λw−λo) (2) FIG. 2 schematically shows the above-described viscosity mixing ratio meter incorporated in a fuel supply system. FIG. 3 is a diagram showing a state in which fuel flows partially from the middle of the fuel main pipe 15 and flows into the measuring device in FIG. 1. Based on the value of the absolute viscosity η calculated by the first calculator 7, the fuel heater (for example,
The controller 14 of the electric heater is controlled. Further, the controller 17 of the water supply pump 16 is controlled based on the value of the water ratio α calculated by the second calculation device 10. In the figure, reference numeral 11 denotes a main fuel pump, 12 denotes a homogenizer, 1
3 is a main heater, 19 is a water tank, 21 is a fuel tank,
Reference numeral 23 denotes a fuel injection valve, and reference numeral 25 denotes a mixed liquid return pipe.
Since the viscosity mixing ratio meter has been described with reference to FIG. 1, detailed description will be omitted. In the above description, the metering pump is used as the flow control device. However, when there is a pressure difference, a flow control valve may be used instead of the metering pump.

[0016]

As described above, according to the present invention, the viscosity of the mixture of emulsified water and oil and the ratio of water can be accurately measured with a relatively simple apparatus.

That is, according to the present invention, the flow rate Q of the mixture of emulsified water and oil is determined by the flow rate control device, and the radius R and length L of the thin tube are also known. If the difference (P1-P2) is known,
From the Poiseuille equation, the absolute viscosity η of the emulsion can be determined.

Η = π / 8 (P1−P2) / Q / R ⁴ / L On the other hand, the heater, that is, the electric heat of the electric heater is kept constant, the heating heat H is kept constant, the specific heat λw of the water and the specific heat λ of the fuel
Since o is known, the temperature difference between the inlet and the outlet of the heater (T2
-T1), the ratio α of water can be determined from the following equation. α = (H / (T2−T1) / Q−λo) / (λw−λ
o) Further, in the present invention, since the flow rate control device for supplying the mixed liquid to the thin tube for viscosity measurement and the heater is shared, it is possible to suppress a rise in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a viscosity mixing ratio meter according to the present invention.

FIG. 2 is a schematic diagram showing a state in which the viscosity mixing ratio meter of FIG. 1 is incorporated in a fuel supply system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Flow control device 2 Thin tube 3 Heater 5, 6 Pressure gauge 7 First computing device 8, 9 Thermometer 10 Second computing device

Claims (1)

[Claims] 1. A flow control device for making a flow rate of a mixture of water and oil emulsified constant, a thin tube having a predetermined radius and a pipe length through which the flow of the mixture is regulated by the flow control device, Pressure gauges respectively installed at the inlet and the outlet of the thin tube, a first arithmetic unit for calculating the viscosity of the mixed liquid from the pressure difference between the two pressure gauges, and heating for heating the mixed liquid whose flow rate is regulated by the flow rate control device A viscometer, a thermometer installed at an inlet and an outlet of the heater, and a second calculating device for calculating a ratio of water from a temperature difference between the thermometers. .