JPH03275488A - Monitoring and controlling device for clogging in banker hopper - Google Patents

Abstract

PURPOSE:To automatically eliminate clogging of fluidized solid matter by varying an acoustic level to be detected by an acoustic microphone and a vibration acceleration to be detected by an acceleration sensor if the matter is clogged in a banker hopper, inputting the signals to a computer and driving an external unit according to the signal from the computer. CONSTITUTION:In order to detect an intrinsic frequency vibration to be generated when coal 2 flows to a coal banker hopper 12, an acoustic microphone 7 for detecting an acoustic level and an acceleration sensor 8 for detecting a vibration acceleration are mounted at arbitrary positions of the hopper 12, and in order to remove a dark vibration due to supply of coal to a coal banker 3, and an acceleration sensor 4 is also mounted at the top of the banker 3. The measured data of the microphone 7 and the sensors 8, 4 are converted into electric signals by a signal converter 10, and then input to a computer 11. The computer 11 compares it with initial input data, and judges the state of clogging. It it judges coal clogging, water is injected to the hopper 12 to vibrate the hopper.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a bunker that temporarily stores flowable solids such as coal, and is capable of automatically detecting the clogging status of the flowable solids in the bunker hopper section at the bottom of the bunker. related to devices that are monitored and managed.

[Conventional technology]

Conventionally, for example, in a coal bunker that is installed on the downstream side of a coal crusher and temporarily stores coal to supply coal to a coal combustion boiler, when the bunker hopper section at the bottom of the coal bunker is clogged with coal, In order to eliminate clogging, a device for injecting water into the bunker hopper section and a vibrator for vibrating the bunker hopper section are provided.

Additionally, a device is provided to detect the presence or absence of coal in the bunker hopper using radiation, ultrasonic waves, static electricity, or the like.

[Problems to be Solved by the Invention] Conventionally, devices have been provided to detect the presence or absence of coal in the bunker hopper section, but there have been no devices equipped with a device to detect the flow status and clogging status of coal.

In other words, in the conventional technology, no consideration has been given to a function that continuously monitors the clogging status of the coal bunker hopper section over time, automatically makes a judgment, and takes measures to prevent coal clogging in the bunker hopper section. The problem was that I couldn't do it.

An object of the present invention is to provide a device that can continuously monitor the movement status of coal in a bunker hopper over time, automatically judge and take measures, and prevent clogging.

[Means to solve the problem]

In order to solve the above problems, the bunker hopper clogging monitoring and management device of the present invention includes a microphone that detects the sound level and a vibration acceleration that is attached to a predetermined position of a bunker that temporarily stores flowable solids. It is characterized by comprising an acceleration sensor, a computer that processes signals from the microphone and the acceleration sensor, and an external device that is driven by the signals from the computer and eliminates the clogging of the hopper section.

[Effect]

In the present invention, when the bunker hopper starts to become clogged with flowing solids, the sound level detected by the acoustic microphone and the vibration acceleration detected by the acceleration sensor change due to a decrease in the flow rate of coal in the bunker hopper or the occurrence of uneven flow. arise.

These signals are input to the computer, the computer determines the clogging situation, and when the clogging is to be cleared, the signal from the computer drives an external device to automatically clear the clogging with the fluid solids.

〔Example〕

FIG. 1 is a diagram showing the configuration of a bunker hopper clogging monitoring/management device according to an embodiment of the present invention. This embodiment shows an example in which the present invention is applied to a coal bunker installed on the downstream side of a coal crusher for supplying coal to a coal combustion boiler.

1 is a coal supply conveyor, 2 is coal, 3 is a coal bunker, 1
2 is a coal bunker hopper, 4 is an acceleration sensor, 5 is a vibration-proof rubber, 6 is a sound insulation cover, 7 is an acoustic microphone, 8 is an acceleration sensor, 9 is a coal delivery conveyor, 10 is a signal converter, and 11 is a computer.

Coal 2 pulverized by a coal pulverizer (not shown) is supplied to a coal bunker 3 by a coal supply conveyor 1, falls from a coal bunker hopper 12, and is supplied to a coal combustion boiler by a coal delivery conveyor 9.

In order to detect the natural frequency vibration that occurs when the coal 2 flows into the coal bunker hopper 12,
An acoustic microphone 7 for detecting a sound level (sound pressure level) and an acceleration sensor 8 for detecting vibration acceleration are attached at an arbitrary position. The acoustic microphone 7 and the acceleration sensor 8 simultaneously measure in real time within a limited frequency band to be monitored (measured). In addition, when installing the acoustic microphone 7, in order to eliminate the influence of background noise from other sound sources (for example, the coal supply conveyor 1, the coal discharging conveyor 9, etc.) Attach the acoustic microphone 7.

Regarding the acceleration sensor 8, the acceleration sensor 4 is also attached to the upper part of the coal bunker 3 in order to exclude dark vibrations caused by the supply of coal to the coal bunker 3.

Measurement data from acoustic microphone 7 and acceleration sensor 8.4 is converted into an electrical signal by signal converter 10, and then input to computer 11. The computer 11 performs Fourier transform on these signals in order to analyze the frequencies in real time, analyzes the correlation (coherency) of each signal in a predetermined frequency band, and uses the learning function to perform a Fourier transform on these signals to analyze the frequencies in real time. Compare and output the signal.

Further, the computer 11 is configured to input a coal feeding amount request signal for the coal discharging conveyor 9, which is generated from a control panel on the coal crusher side, and to vary the monitoring frequency band. As the amount of coal supply changes, the speed of movement of coal changes, so
It is necessary to vary the monitoring frequency band.

Next, an example of calculation (monitoring) items on the computer 11 is shown in Figure 2 (
Shown in a) to (c).

Acoustic microphone 7 and acceleration sensor 8.4 on computer 11
The specific items of the calculation are, for example, ■ Coherency (correlation between each signal) between sound level and vibration acceleration (Figure 2 (a)), ■ Peak of sound level The ratio that the level shows in the monitoring frequency band (peak level/overall amount level), ■ The ratio that the peak level of vibration acceleration shows in the measurement frequency band (peak level/overall amount), ■ The behavior of each peak level (
Movement of peak levels due to changes in the monitoring frequency band, etc.) is monitored in the monitoring frequency band. (at least one of them) with the initial input data of the computer 11 to determine the status of the blockage. These ■～
The computer 11 compares at least one of (2) with the initial input data and determines the clogging situation. If you determine that the coal is clogged,
The coal bunker hopper 12 is driven by a water injection device (not shown) that injects water into the bunker hopper section 12 to clear coal clogging, and a vibrator (not shown) that vibrates the bunker hopper section to clear coal clogging. This prevents coal flow from stopping due to coal clogging. These external devices are interlocked together. Also, the second
The data shown in Figures (a) to (C) are the CR of the computer 11.
It is displayed on T.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the spirit of the invention. For example, the acoustic sensor 7 installed in the coal bunker 3,
In addition to the measurement data of the acceleration sensor 8.4, the information on the operating and stopping conditions of the coal supply conveyor 1 and the operating and stopping conditions of the coal discharging conveyor 9 is also input into the computer 11, and the computer 11 is made to learn (initial input data The clogging situation can also be determined by comparing the

Further, in the above embodiment, an example was shown in which the acoustic microphone 7 is attached to the outer surface of the coal bunker hopper 12 to detect the sound level, but if a protrusion such as a steel pipe is provided inside the coal bunker hopper 12, it may move. Since the sound level increases as the coal collides with the protrusion, the accuracy of detection by the acoustic microphone 7 can be improved.

Furthermore, if coal clogging occurs, an alarm device may be provided that is activated by a signal from the computer 11.

〔Effect of the invention〕

As explained above, the bunker hopper clogging monitoring and management device of the present invention can continuously monitor the onset of clogging of the flowing solids in the bunker hopper over time, and automatically prevent the flowing solids from stopping due to clogging. It can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a bunker hopper clogging monitoring/management device according to an embodiment of the present invention, and FIGS. 2(a) to (c) are
FIG. 3 is a diagram showing an example of calculation items on a computer. 1... Coal supply conveyor 2... Coal 3... Coal bunker 4... Acceleration sensor 5... Vibration isolating rubber 6... Sound insulation cover 7... Acoustic microphone 8... Acceleration sensor 9 ... Coal delivery conveyor 10 ... Signal converter 11 ... Computer 12 ... Coal bunker hopper

Claims (1)

[Claims] 1. A microphone for detecting a sound level and an acceleration sensor for detecting vibration acceleration, which are attached to a predetermined position of a bunker for temporarily storing flowable solids, and a computer for processing signals from the microphone and the acceleration sensor; A bunker hopper clogging monitoring and management device, comprising an external device that is driven by a signal from the computer and eliminates clogging in the hopper.