JPS58218655A - Particle velocity measuring method - Google Patents

Abstract

PURPOSE:To measure a particle velocity for every particle size by photodetecting a reflected ray containing plural colors obtained by illuminating colored particle group in a solid and gas mixture with a white ray, at two points spaced a specified distance, spectrally dividing it by a prism, and deriving a mutual correlation coefficient of an intensity signal of light of each color. CONSTITUTION:Light from a white color light source 12 is transmitted by an illuminating optical fiber 3, particle groups 1-a, 1-b are irradiated simultaneously, its reflected ray is transmitted to prisms 6, 7 through photodetecting fibers 4, 5, and it is split into red lights 6-a, 7-a an blue lights 6-b, 7-b. Thereafter, they are made incident to optical-electric transducers 8, 9 or 10, 11, voltage being in proportion to intensity of light is generated, and red output volages 9, 8 and blue output voltages 11, 10 are inputted to correlators 13, 14, respectively. A mutual correlation coefficient of an input signal is calculated by the mutual correlators 13, 14, and a time delay quantity t1' whose coefficient becomes maximum is outputted. In this way, a particle velocity V1=l/t1' can be derived. Provided that l and V1 denote an interval of the photodetecting optical fibers 4, 5, and a particle velocity obtained by using red light.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a total of 11tu particle velocity in a solid-gas mixed phase flow in a coal gasification furnace, coal mill, cement plant, etc.
Regarding the particle velocity IW #1 measurement method.

Coal gasification furnace 1 Coal mill, cement plant, etc. C 11!・When measuring the particle velocity in a gas mixture, use the conventional method); Noro' and 02 are optical fiber probe cylinders.

The same applies to the three optical fiber median lines 03.94.05, which will be described later. 03 is an optical fiber for illumination, and a laser device 06 (described later)
Irradiate the particle group O1 with a laser beam generated by
O4 and 05 respectively.

With one optical fiber for first and second light reception, the above particle group θ)
The TV beams reflected by the TV receivers are transmitted to the first and second beams, which will be described later, to the nausea converters 07 and 08, respectively. 01.0B are the first and second light-mountain devices, respectively;
And the reflected light from the particle group 01 transmitted by the second light-receiving optical fiber 04, Oj, whose output voltage signal is proportional to the intensity 51 of the light. are respectively input to the cross-correlator 09 described later◎09
is a cross-correlator, and the first and second optical-to-electrical converters 0
7. Calculate the cross-correlation coefficient of the output voltage signal of 0 B, and output the time delay Φtp' at which the coefficient is maximum.1
- In Figure 1 above (see Figure 2), the laser beam generated by the laser device 06 is transmitted through the illumination optical fiber 03 to irradiate the particle group II to be measured.◎Particle group 0II - irradiated laser beam The light is reflected by the particle group O), and a portion of the reflected light is incident on the end faces of the first and second light-receiving optical fibers DJ, D5, and the first and second optical-to-electrical converters oy, respectively.
◎First and second optical-electrical exchanges 50
7 and 08 are each converted into a voltage 52 proportional to the intensity C2 of the incident light. The two voltage signals are then input to the cross-correlator 09, respectively. Cross-correlator 09 section - input first and second light -°
The output voltage signal from electrical converter 07.0B, respectively.

Letting x(t) and y(4), the cross-correlator 09 calculates the cross-correlation coefficient 14 x y'(t') l expressed by the following equation.
jr: Calculate.

We're friends.

Then, the value of the time delay t' that maximizes the seven-phase-bl-port-1 relational coefficient Rxy(t') is determined and output and displayed. Here, the interval %j 1. I- Then,
The required particle speed of 1 particle group O is 1uv.

y=t/lp' @-@(51) The conventional method shown in the first part above is relatively simple (it can measure the velocity of two particle groups, but it has the drawback of first order).

Coal gasifier 1 Performance of coal mills, cement plants, etc. and development research [2] In experiments.

Particle velocity? It is necessary to measure each particle size, which is very important for understanding development, but the conventional method cannot measure the speed for each particle size. ◎ If you measure C2 individually, the behavior will change. Therefore, in the above-mentioned powder and granule experiment, the behavior could be fully understood.
Can not.

The present invention combines two of the above points.

Solid-Gas Multiphase Flow Particle Screen C2 Light is irradiated with an illumination optical fiber, and the reflected light is received at two points separated by a certain distance, and the cross-correlation coefficient of the light intensity signal at those two points is calculated. The amount of time delay t at which the value becomes the maximum value. ? Find, from the distance t between the two points above,
V ” L / 165 Calculate the speed iV of one particle group from C- In the particle velocity measurement method, the particle group to be measured is colored differently from each other for particle diameter ≦ - spring color, and illumination containing light of multiple colors is used. The reflected light obtained by illuminating a group of spring-colored particles with light is received at two points separated by a certain distance, and each reflected light is divided into two colors (monochromatic colors of two corresponding colors) of the aged-colored particles. Light intensity of light (- from 1 to 1
The gist is that the particle velocity, that is, the particle velocity for particle size, is measured. +t Nt collateral method [1].

An embodiment of the present invention will be explained below with reference to Figure 1'1llv.
For example, i-b is the second group of particles to be measured; Glass beads 6 are painted with spring-colored dye. 2 is the optical fiber probe barrel, and the 3 single optical fibers described later are 3.4.5 f. ◎ 3 is the optical fiber for illumination. The above-mentioned white light 114 + generated by a white light source 12 described below
and 1 ((1 shot. 4
．． Reference numeral 5 denotes the first and second light receiving optical fibers, which are inserted into the particle group J-a 17-b at a certain interval tW, and are reflected by the particle groups ta and tb. It receives the light and transmits it to first and second prisms 6.7, which will be described later. Reference numeral 6.7 denotes first and second prisms, which convert the reflected light transmitted by the first and second light-receiving optical fibers 4.5 into red lights 6-a and 7 using the spectroscopic function of the prisms. -a and the gray light 6-b, 7-b are sent off, and the red light 6-a, 7-a is incident on the first and second opto-electrical converters 8.9 described later do. Furthermore, the blue lights 6-b and 7-b enter third and fourth optical-to-electrical converters 0°II, which will be described later. 8 and 9 are first and second optical-to-electrical converters, and the light intensity C of the red light 6-a+7-a separated by the first and second prisms 6.2, respectively;
Generates two proportional voltages. And.

The output voltage signals are input to first cross-correlators 13, which will be described later. olO-11 are third and fourth optical-to-electrical converters, which are connected to the first and second prisms 6, respectively.
．． Light intensity 10' of blue light 6-b and 7-b separated by 2
□Then, the output voltage signals are respectively input to the second phase-correlator 14 described above. ◎12 is a white ninth order, which generates white light, ◎13, which is input to the illumination optical fiber 3, is the first phase 4 correlator -1: fr-! Calculate the cross-correlation coefficients of the output voltage signals of the pigeon 1 and the second opto-electrical converter 8.9, and output and display the time delay amount t,'+ at which the coefficient becomes the maximum◎
14 is the second cross-correlator, and
Yamaki converter 10. The output voltage of II is calculated by calculating the correlation coefficient 1 (n+t-) and outputs the time at which the coefficient becomes maximum; P4 1,1.

Next, the operation of the second embodiment will be explained. In Figure 2 C2, white light generated at 6+Htz? , and is transmitted through the illumination optical fiber 3 to simultaneously irradiate the first and second particles to be measured -#Fj-a and t-b. The particle group la of the funeral rite illuminated with white light is red ≦ - Since it is color blind, it reflects red light more strongly than other colors ◎ And similarly.

The second particle group 7-b illuminated with white light is colored blue 1-blue, so it reflects blue light more strongly than other colors≦1. The reflected light including red and blue is the first and second reflected light.
The light enters the light-receiving optical fiber 4.5 and reaches the first and second prisms 6.7. The first and second prisms 6.2 split the incident light into red light 6-a, respectively.
.

2-a, and blue light 6-b, 7-bC are separated.

The red light 6-a*7-a is then sent 4m to the first and second light-to-air converters 8.9.

The blue lights 6-b and 7-b are transmitted to the third and the first light-to-four-air converters 10 and 77.

By the way, the first and second optical-to-electrical converters 8.9 each emit red light 6-a, ? -A is converted into a voltage proportional to the light intensity 1 unit, and its output is ``city voltage''.

]th cross-correlator 13. The first cross-correlator 13 calculates the cross-correlation coefficient of the two output 4 pressures 4′t<, and calculates the time delay amount t at which the cross-correlation coefficient becomes maximum;
' Find Y and output and display ◎ Clearance delay amount t, 1 that gives the peak value of the cross-correlation coefficient? Once determined, the linear equation C2 and the particle velocity V can be determined as in the conventional method.

v, = t/l,' e-・(6) However, t is 1
The spacing of the optical fibers 4.5 for receiving light at f41 and 2 is obtained using red light. -f no lI: gives a velocity of t-a.

Next, the optical-to-electrical converter 10*J for the above 3 and d64
I is the light intensity tf1- of the blue lights 6-b and 7-b, respectively.
The proportional tl:l2 transform and its output 4'tl is input to the second ratio, correlation 614. The cross-correlation 614 of @2 is calculated by calculating the compatibility correlation coefficient of the above two outputs and calculating the time when the cross-correlation coefficient is maximum.
1.1 Find and display the output. By finding the time delay -1,'1 that gives the peak value of the cross-correlation coefficient, the particle field IW' V # can be found using the same linear equation as above.

V B = /, / tH' ”... (7) Since VB before i above is the particle velocity obtained using blue light, give the velocity of the blue-blue particles, that is, the second particle group t-b. ing.

As described above, according to the method of the present invention, the particle group to be measured is aged with a plurality of different colors for grain size, and the colored particle group? Reflected light containing multiple colors obtained by illuminating with white light? , after receiving light at two points separated by a certain foot distance,
Since the cross-correlation coefficients of the intensity signals of the light of each color were calculated using a prism, the velocity of the aged particles, that is, the particle velocity of each particle size, was measured using C2. ◎Therefore.

IJ, which is capable of measuring particle velocities by particle size in coal gas and other furnace flow Im, solid-gas mixed-phase flows such as lime mills and cement plants, which could not be measured with conventional methods, is an accurate method for solid-gas mixed-phase flows. It is something that can be grasped in

[Brief explanation of the drawing]

Figure 1 (a) shows the # configuration of the conventional particle velocity measurement method;
The first factor (bl is the X-X arrow line factor in FIG. 1(a). FIG. 2 is a particle try of 1 7- a ·-m 1, which is a constituent prisoner showing an example of the present invention. 7'-b-i
xg 2 particle groups, 2... optical fiber 10 tube body,
3... Optical fiber for illumination, 4.5... 1st. Second light-receiving optical fiber, 6.7...ffz, second prism, 8°y, 441. m2) shi-yamaki ze device, 10
．． 11...3rd. Light of Condolence 4 - City: Ki Converter, No 2...
・White light source, 7J...l-th phase 1-J bicorrelator, 14
...Second cross-correlator. 11 applicants 1111 people Patent attorney Rin Ushiki Hiko 2

Claims (1)

[Claims] Light is irradiated onto particles in a solid-gas multiphase flow using an optical fiber for illumination,
The reflected light is received at two points separated by a certain distance,
The time delay amount t at which the cross-correlation coefficient of the optical intensity signal at the two points reaches its maximum value. Then, from the distance t between the above two points, v
=L/l. Calculate the velocity of one particle group oi from 1-
In the particle velocimeter side method C, the particle group to be measured is separated by particle size (1 each other (-) and the reflection obtained by illuminating the colored particle group with illumination light that is aged to different colors and contains light of multiple colors. Light is received at two points separated by a certain distance, and the reflected light from each is divided into particles according to particle size based on the light intensity i signal of monochromatic light of the color corresponding to each color C of the color viewing particles. A particle velocity measurement method characterized by two unique features for measuring velocity.