JPS5919823A - Automatic recording device of shell temperature of rotating body - Google Patents

Abstract

PURPOSE:To detect a temperature of a shell of a kiln body, to record it automatically, and to know exactly the adhering state of coating, by one measuring device from a place which is distant from an object to be measured, by measuring radiant energy by an optical head, converting it to an electric signal, recording or displaying it, and measuring and recording automatically a temperature distribution in the circumferential direction of the shell. CONSTITUTION:Infrared rays 7 being one of radiant energy are detected by an optical unit 6 from a shell of a kiln 1, are converted to an electric signal (e), and are inputted to a control unit 8. The electric signal (e) sent from the optical unit 6 is an analog value, a temperature-electric signal becomes nonlinear, it is calculated so as to be linearized in the control unit 8, and is made so that the temperature-electric signal is proportional. The temperature signal linearized in the control unit 8 is an analog signal, is inputted to a monitor unit 9, and a temperature distribution state obtained by measuring from the left end of the shell of the kiln 1 to a position of the right end is displayed as a video on a cathode-ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a 7-process temperature automatic recording device for a rotating body such as a rotary kiln, which is configured to measure the temperature of the shell of a rotating body and to know the state of formation of coating attached to the inside. It is related to.

A finely powdered cement raw material is fed from one end into a rotary kiln for firing cement, and is delivered to a burner.

In such a rotary kiln or the like, during long-time operation, baked interest adheres to the surface of a heat-resistant layer made of heat-resistant bricks provided inside the kiln.

This deposit is called a coating, and together with the heat-resistant bricks, it enhances the insulation effect, protects the steel that is the exterior material of the kiln, and helps prevent malfunctions such as bending and deformation caused by high heat.

However, the adhered coating gradually grows and enlarges into a ring shape, and eventually peels off.

At this time, the heat-resistant brick may peel off with the surface attached, or sometimes the entire heat-resistant brick itself may peel off, resulting in a failure called "brick drop." If a large-scale coating ring comes off, it will cause a major disruption to plant operation, so it is important to predict when the coating will come off early and prepare for operation.

In this way, inside the shell, the coating repeatedly adheres to and detaches from the brick surface.

Such heat-resistant brick damage, brick falling accidents, etc.

To investigate coating adhesion, closely observe the external surface temperature of the shell at short intervals.

This temperature distribution allows us to understand the state of coating adhesion inside the shell.

Currently, the person in charge of managing the shell carries around a portaple surface thermometer and measures and records the temperature around the entire circumference of the shell at 1m intervals along the entire length of the shell, and at each position, to roughly check the coating's adhesion status. I have one hand in hand.

However, the measurement work is hard work, requiring long hours of work outdoors and near high temperatures, making it difficult to accurately measure demand, and predictions from take can sometimes lack accuracy.

Conventionally, a method has been adopted to measure the state of coating formation inside the kiln by utilizing the phenomenon that when coating is deposited, the temperature of the kiln shell decreases depending on the amount of coating deposited.

However, since the kiln itself rotates and is extremely long, it requires a large number of temperature detectors and workers, making it not a practical detection method.

Incidentally, the relationship between the temperature of an object and the radiated electromagnetic wave energy W is generally expressed by the following equation (referred to as the blank equation).

W-ε(-T4 In addition, in the above formula, E゛ is emissivity and 6J is a constant.

T is absolute temperature.

Therefore, by knowing the total radiated energy W, the temperature of the object can be indirectly known.

By utilizing the principles described above, the present invention detects the temperature of the shell of the kiln body over several tens of meters with a single measuring device from a location far away from the object to be measured, and automatically records this. Another object of the present invention is to provide an automatic shell temperature recording device for a rotating body configured to be able to reliably know the state of coating adhering to the inside.

In order to achieve the above object in the present invention.

By measuring radiant energy using an optical head with a built-in scanning mirror, this radiant energy is converted into an electrical signal, which is then recorded and displayed.

We adopted a configuration that can automatically measure and record the temperature distribution in the circumferential direction at a predetermined position on the shell.

Next, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 and subsequent figures illustrate one embodiment of the present invention.

In each figure, the same reference numerals are given to the same or corresponding parts, and the explanation thereof will be omitted.

FIG. 1 explains the outline of the apparatus of the present invention.

In this figure, what is indicated by the reference numeral 1 is the main body of the rotary kiln. The main body 1 of the kiln is rotated by a motor 2 at a predetermined speed.

This motor 2 is equipped with a tacho generator, and the rotational speed of the kiln 1 is constantly detected.

The voltage is converted into a voltage by a voltage converter 36 and input to a shell temperature automatic recording device described below.

The kiln 1 is circumferentially divided into, for example, ten equal parts, numbered from 0 to 9, and serves as an element for determining the temperature measurement position.

Further, a protrusion 4 is protruded at a predetermined location corresponding to one of the addresses on the outer circumferential surface of the shell of the kiln 1, and by turning on a limit switch 5 from this protrusion 4, a pulse signal is generated (filter 5). is a pulse amplifier), and this pulse is used as a signal (synchronization pulse) for changing the recording position.

On the other hand, in the kiln 1, positions to be measured are determined along the axial direction of the kiln 1, and these positions are set, for example, every 1 m.

Therefore, the temperature of the shell is at longitudinal position 2 of the kiln.
For example, measurements are taken at addresses 0 to 9 at a position 23 m from one end.

In Figure 1, the reference numeral 6 is the optional power unit, which will be described later. ing.

FIG. 2 is a block diagram showing a schematic configuration of the temperature measurement system of the apparatus of the present invention.

In this figure, 1 of the radiant energy from the shell of kiln 1 is
The infrared rays 7 are detected by the optical sensor and converted into electrical signals e.

input to control unit 8.

The electrical signal e sent from the optical power unit 6 is an analog quantity, and is proportional to the fourth power of the absolute temperature T, as shown in the blank equation.

The temperature-electrical signal becomes non-linear, and the control unit 8 calculates it to linearize it.

A state is established where the temperature and electrical signal are proportional.

The temperature signal linearized in the control unit 8 is an analog signal, and is input to the monitor unit 9, and the temperature distribution state measured from the left end to the right end position of the shell of the kiln 1 is displayed as an image on a cathode ray tube.

Similarly, the temperature analog signal is input to the recorder interface 10, and the temperature signal at a predetermined measurement position, for example, 14nZ position from the left end of kiln 1, is recorded by a combination of a start pulse and a monostable multivibrator, which will be described later. It is taken out, amplified, and the four-pen recorder 11 records the state of change in temperature distribution in the circumferential direction at that position.

FIG. 6 shows the details of the optical head and the connection state of the control system.

As shown in FIG.
There is a rotating housing 13 that is rotated by a motor 12, and four mirrors 14 are fixed to the outer surface of the rotating housing 13.

This rotating housing 1 is fired at a constant speed 2, for example, 1800 times,
It is guided by a concave mirror 16, focused, and bent at a right angle again by a fixed mirror 17 to form a photoelectric cell 18 made of a solid material such as lead selenide.
and is converted into electricity.

The control unit 2 node 8 is amplified by an amplifier 19 and housed in the operation panel 20 as a shell temperature signal.
is input.

By the way, in FIG. 6, what is indicated by numeral 2 is an automatic shell temperature recording device. As shown in Fig. 5, this device consists of a 4-step unit 1-24 and a 4-step unit 1-25.
．． Memory l-261 Chart Heat Control Loaf 27. source) 28° 2 pen recorder 29. It consists of an operation and instruction unit.

The stepping unit 24 uses two stepping relays (not shown) and is switched for each channel from channel 0 to channel 69, for example, by a synchronizing pulse obtained from the limit switch 5, which is generated every rotation of the kiln. Each time the channel is switched, the reed relay filter 1 corresponding to that channel is energized. The contact point of reed relay 1 is 2, for example, 30Ω variable resistor 2.
It is connected to the.

This variable resistor filter 2 is shown with the same reference numerals in FIG. 6, and by changing its resistance value, the measurement position can be changed.

On the other hand, in order to operate this device, first measure the temperature of the /el at multiple locations.

For example, 65 positions are determined, and the resistance values of the variable resistor filters 2 of the memory unit 26 are adjusted in the order of the scan numbers in accordance with the order of the positions.

In other words, 65 measurement positions are stored with their respective resistance values. Note that the resistance value of each position is measured in advance and recorded as a take.

Each time a synchronizing pulse that is generated every rotation of the kiln is input to the input section of the stepping unit 24, the stepping unit 24
Proceed channel by channel. For this reason.

The resistance value of the memory unit 26 changes for each channel,
This resistance value is input to the recorder interface 10.

Inside this recorder interface 1o, as shown in FIG.
1. (hereinafter abbreviated as monomulti M) variable resistor 3
This means that the resistance value of B changes every rotation. Therefore, the time constant of the recording position setting signal changes.

Therefore, a temperature signal in the circumferential direction of the kiln shell position 7 determined for each rotation of the kiln is inputted to the automatic shell temperature recording device 23.

This signal S is transmitted to the two-pen recorder 2 as shown in FIG.
9 and is used as an input for the instruction and operation unit port 0,
Records and instructions are made.

Here, the actual measurement of the temperature distribution of the tube will be explained with reference to FIGS. 6 and 7.

As shown in Figure 7, the area where you want to know the coating generation state with certainty is 56 m from the left end position 12n1 of the kiln.
up to the position.

First, the pilot lamp 21 of the optical unit 6
When the reflected light enters the photoelectric cell 22, a start pulse is generated as shown in FIG. 7 (■), and the output of the monomulti M is turned off as shown in FIG. This off time is determined by the setting value of the variable resistor 34 of the monomulti M2.

A temperature signal at the set position can be obtained while the monomulti is off. This temperature signal is recorded by a pen recorder.

The recording paper of the pen recorder is equipped with a chart speed controller 27 so that even if the number of rotations of the kiln changes, the recording during one rotation of the kiln can be recorded on a recording paper of a constant length. This principle is based on the rotation of the kiln motor 2 being taken out by the tacho generator B. The temperature distribution obtained as above and the estimation diagram of the coating sticking are shown in Figures 8 (A) and (B).
and FIG. 9(A).

Shown in (B).

Figure 8 (A) shows 24 points from the entire temperature distribution from the 15m position of the kiln shown in Figure 10 to the 52772 position.
The temperature distribution from address 0 to address 9 at position m is taken out, and FIG. 8(B) shows the estimation of coating adhesion based on this.

In FIG. 8(B), the part indicated by the reference numeral 37 corresponds to the heat-resistant brick layer, and the part A8 shown as irregular irregularities on the inside thereof is the coating.

That is, in FIG. 8(A), the portion where the temperature is low near No. 2 to No. 4 at the 24 m position is the portion to which the coating is attached.

Figures 9(A) and 9(B) show the same area measured the next day, and it can be inferred that the coating has adhered and is growing. FIG. 11 shows the temperature distribution throughout the kiln at this time.

By knowing the temperature distribution in this way, you can accurately know the state of the coaching process.

According to the present invention, as is clear from the explanation below.

The temperature distribution in the kiln well can be measured by measuring radiant heat, and the deposition state of the coating can be detected quickly and accurately from this temperature distribution.

Therefore, one operation is extremely labor-saving, and the kiln can be operated normally.

[Brief explanation of the drawing]

The figure shows one embodiment of the invention. Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a block diagram showing the schematic configuration of the humidity measuring system of the device of the present invention, and Fig. 2 shows details of the optical unit and the connection state of the control system. 4 is a perspective view of the rotating whistle body, FIG. 5 is a block diagram showing the temperature measurement system, FIG. 6 is an explanatory diagram of the temperature signal detection circuit, FIG. 7 is a timing chart, and FIG. 8 (A)
9(A) is a temperature distribution diagram in the identified kiln el, (B) is a diagram showing the state of coating adhesion, and FIG. 9(A) is a diagram showing the coating adhesion state.
), (B) is a diagram showing the coating adhesion state at that time, and FIGS. 10 and 11 are diagrams showing the humidity distribution within a predetermined range of the kiln. 1 is the main body of the kiln, 2 is the kiln motor, 3 is the tacho generator, 4 is the projection at a specified location, 5 is the limit switch, 6 is the optical unit, 8 is the control unit + 9 is the monitor unit. 10 is a recorder interface, +1id4 pen recorder, 13 is a rotating housing, 14 is a mirror, 16 is a concave mirror, 1
7 is a fixed mirror, 18 is a photocell, 19 is an amplifier, 20
is a control panel, 23 is a 7-work depth automatic recording device, 24 is a step unit, 25 is a sequencer unit, 2bld, memory unit + 27i1 chart speed controller,
28 is the power supply unit. 29 is a 2-pen recorder, Ro0 is an operation and instruction unit,
Lo1 is a reed relay, 32. Filter 4 is a variable resistor, filter 5 is a pulse amplifier, and filter 6 is a voltage converter. 37 is a refractory brick layer, and filter 8 is a coating. Figure 1 Figure 2 Figure 4 Figure 8 Figure 9 (A) (,A)

Claims (1)

[Claims] a device that detects radiant heat by scanning in the axial direction of the shell and scanning at equal angular intervals in the circumferential direction of the shell;
An automatic shell temperature recording device for a rotating body, comprising a device that converts this radiant heat into an electrical signal and a device that records the temperature distribution of the radiant heat converted into an electrical signal.