JPH01316613A - Method for measuring flow rate transporting particle - Google Patents

Abstract

PURPOSE:To accurately measure the flow rate transporting particles by detecting the differential pressure between two points of an upper and lower points when the particles are pneumatically transported upward along a pipeline. CONSTITUTION:A differential pressure transmitter 7 which measures the differential pressure between two points of an upper point A and lower point B of a vertical pipeline 5 is provided. The differential pressure signal 8 of the transmitter 7 is led to a recorder 9 and variation of the differential pressure is recorded and, at the same time, the signal 8 is integrated by a unit time by means of a program operator 10 and the integrated value 11 is led to and recorded on an integrated value recorder 12. Moreover, when a converting equation between an actual transporting quantity and the integrated value is experimentally found and the integrated value 11 is inputted to a flow rate calculating arithmetic device 13 to which the conversional equation is already inputted, the flow rate transporting the particles can be calculated continuously and displayed or recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the transport flow rate when particles are transported by air current.

[Prior Art] In the gas or pneumatic transport system (referred to as a riser) for the iron oxide desulfurization agent in dry desulfurization equipment and the pulverized coal fuel transport system in pulverized coal equipment, etc., it is difficult to understand the desulfurization effect and fuel flow rate. , it is required to know the flow rate of air-borne particles.

[Problem to be solved by the invention] However, in the past, it was not possible to directly measure the flow rate of particles/particles transported by air current.

The present invention has been made in view of these points, and an object of the present invention is to provide a method for accurately measuring the flow rate of particles transported by air current.

[Means for Solving the Problems] The present invention attempts to solve the above technical problems, and
When particles are transported by pneumatic flow, they are transported from below to above through piping, and the differential pressure between two points above and below in the piping at this time is detected, and the differential pressure is further integrated for each required unit time. , a method for measuring a particle transport flow rate, characterized in that the particle transport flow rate is measured from the integral value.

[Function] Therefore, in the present invention, since the integral value of the differential pressure between two points above and below when airflow transporting particles from the bottom to the top along the pipe is proportional to the transport flow rate of the particles, the particle to measure the transport flow rate.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an example of the case where the method of the present invention is applied to a pneumatic transport system for iron oxide desulfurization agent.
In this device, particles transported by pneumatic flow through a container 4 that forms a fluidized bed 3 by supplying the fluid are guided upward through a vertical pipe 5 and separated into fluid 2 and particles 1 by a separator 6 provided at the top. A differential pressure transmitter 7 is provided to measure the differential pressure between the upper and lower two points ASB.

Further, the differential pressure signal 8 from the differential pressure transmitter 7 is guided to a recorder 9 to record fluctuations in the differential pressure, and the differential pressure signal 8 is
is integrated per unit time by a program calculator IO, and the integrated value 11 is led to an integral value recorder 12 and recorded.

On the other hand, the flow rate of particles is continuously calculated by finding a conversion formula between the actual transport amount and the integral value through experiments, and manually inputting the integral value 11 into the flow rate calculation device 13 into which the conversion formula is input. , can be displayed or recorded at the same time.

The differential pressure signal 8 from the differential pressure transmitter 7 fluctuates as shown in FIG. 2, for example, and this is recorded on the recorder 9.

Further, the program calculator 10 integrates the shaded portion of the differential pressure signal 8 shown in FIG. 2 every unit time (for example, 3 minutes),
The integral value 11 is output to an integral value recorder 12 and recorded. The integral value recorder 12 records the result as shown in FIG. 3 or 4.

Figure 3 shows the case where the particle flow rate is 450 kg/h, and Figure 4 shows the case where the particle flow rate is reduced to half (225 kg/h) under the same conditions as in Figure 3. There is.

As a result of various repetitions of the above experiment, it was confirmed that the amount of particles transported was proportional to the above integral value.

As mentioned above, since the integral value 11 of the differential pressure is proportional to the amount of particles transported, a conversion formula for the actual measured value of the transported amount and the integral value is created, and the amount of transported particles is calculated from the continuously obtained integral value 11. can be estimated continuously. Therefore, the amount of particles transported can be continuously calculated and displayed by the flow rate calculating device 13 into which the actual measured value of the transported amount and the conversion formula of the integral value are input.

In addition, in the above, the baseline of the integral is adjusted according to the swing of the differential pressure signal 8, and the baseline is set at the bottom of the swing of the differential pressure (differential pressure that occurs regardless of the amount of transport) that changes sequentially due to changes in operating conditions. By combining these, it is possible to improve the accuracy of estimating transportation volume.

It should be noted that the present invention is not limited to the above embodiments, but can be applied to measuring the transport flow rate of various particles transported by air current, and various other changes can be made without departing from the gist of the present invention. Of course, it is possible to add .

[Effects of the Invention] As described above, according to the method for measuring the particle transport flow rate of the present invention, the differential pressure between two points above and below when particles are air-transported from the bottom to the top along the pipe is detected. However, since the integral value of the differential pressure is proportional to the particle transport flow rate, an excellent effect can be achieved in that the particle transport flow rate can be measured with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is a diagram showing changes in differential pressure over time, and FIG. 3 is a diagram showing changes in integral value of differential pressure over time. FIG. 4 is a diagram showing the change over time in the integral value of the differential pressure when the transport amount of particles is halved compared to FIG. 3. FIG. 5 is a vertical tube, 7 is a differential pressure transmitter, 8 is a differential pressure signal, 10 is a program calculator, 11 is an integral value, 12 is an integral value recorder,
13 indicates a flow rate calculation device.

Claims (1)

[Claims] 1) When particles are transported by pneumatic flow, they are transported from the bottom to the top through piping, and the differential pressure between the two points above and below in the piping at this time is detected, and the differential pressure is further measured every required unit time. 1. A method for measuring a particle transport flow rate, comprising integrating the particle transport flow rate and measuring the particle transport flow rate from the integrated value.