JPH0262808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic shell temperature 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 a coating attached to the inside. It is.

A finely powdered cement raw material is fed from one end into a rotary kiln for firing cement, and is fired by contacting combustion gas heated to a high temperature by a burner.

In such rotary kilns and the like, fired material adheres to the surface of a heat-resistant layer made of heat-resistant bricks provided inside the kiln during long-time operation.

This deposit is called a coating, and together with the heat-resistant bricks, it further 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 peels 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,
To investigate the coating adhesion status, carefully observe the external surface temperature of the shell at short intervals.
From this temperature distribution, we can understand the state of coating adhesion inside the shell.

Currently, the person in charge of managing the shell carries around a portable 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 in that position, to get a rough idea of the adhesion of the coating. There is.

However, the measurement work is done outdoors, at high temperatures for long periods of time, and requires hard labor, making precise temperature measurements difficult and predictions based on the data sometimes lacking in accuracy.

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

However, since the kiln itself rotates and is extremely long, it requires a large number of temperature detectors and workers, making this method impractical.

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 Planck's equation).

W=εσT ^4In the above equation, ε is emissivity, σ 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 above-mentioned principle, the present invention detects the temperature of the shell of the kiln main body, which is several tens of meters away, using a single measuring device from a location far away from the object to be measured, and automatically detects this temperature. It is an object of the present invention to provide an automatic shell temperature recording device for a rotating body, which is configured to record the temperature of the shell of a rotating body and to reliably know the adhesion state of the coating attached to the inside.

In order to achieve the above object, the present invention measures radiant energy using an optical head with a built-in scanning mirror, converts this radiant energy into an electrical signal, and records or displays it. We adopted a configuration that can automatically measure and record the temperature distribution in the circumferential direction of a position.

Next, the present invention will be explained 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 parts or corresponding parts are denoted by the same reference numerals, 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. A main body 1 of the kiln is rotated by a motor 2 at a predetermined speed.

This motor 2 is equipped with a tachometer generator 3, and the rotational speed of the kiln 1 is constantly detected.
The voltage is converted into voltage by the voltage converter 36 and input to the automatic shell temperature recording device described below.

The kiln 1 is circumferentially divided into 10 equal parts, numbered from 0 to 9, and serves as a factor in determining the temperature measurement position.

Further, a protrusion 4 is protruded at a predetermined location corresponding to one of the addresses on the outer peripheral 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 (35 is a pulse amplifier), and this pulse is used as a signal (synchronization pulse) for changing the recording position.

On the other hand, the kiln 1 has a determined position along its axis, and this position is, for example, 1
It is set every m.

Therefore, the temperature of the shell ranges from 0 to 23 m from one end of the kiln in the longitudinal direction.
Measure as described in Measurement at address 9.

Further, the reference numeral 6 in FIG. 1 is an optical unit which will be described later, and the example shown in FIG. 1 shows a state in which the temperature at address 0 at a position of 23 meters of the kiln 1 is being measured.

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, an optical unit 6 detects infrared rays 7, which is one type of radiant energy, from the shell of a kiln 1, converts this into an electrical signal e, and inputs it to a control unit 8.

The electrical signal e sent from the optical unit 6 is an analog quantity, and is proportional to the fourth power of the absolute temperature T as shown in Planck's equation, so the temperature-electrical signal becomes non-linear. is calculated so as to be linearized in the control unit 8, and a state is established in which temperature x electrical signal is proportional.

The temperature signal linearized in the control unit 8 is an analog signal, and is input to the monitor unit 9, where 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, 14 m from the left end of the kiln 1, is generated by a combination of a start pulse and a monostable multivibrator, which will be described later. The sample is taken out, amplified, and the four-pen recorder 11 records the change in temperature distribution in the circumferential direction at that position.

FIG. 3 shows the details of the optical head and the connection state of the control system.

As shown in FIG. 4, inside the optical unit 6 is a rotating housing 1 rotated by a motor 12.
3, and four mirrors 14 are fixed to the outer surface thereof.

This rotating housing 13 has a constant speed, for example, 1800R.
The radiant energy rotated by P.M is reflected by this mirror 14, guided to a concave mirror 16, focused, and bent at a right angle again by a fixed mirror 17.
It enters a photoelectric cell 18 made of lead selenide or other material, is converted into an amount of electricity, and is amplified by an amplifier 19.
The shell temperature signal is input to the control unit 8 housed within the operation panel 20.

By the way, in FIG. 3, what is indicated by the reference numeral 23 is a shell temperature automatic recording device. As shown in FIG. 5, this device includes a step unit 24, a sequencer unit 25, a memory unit 26, a chart speed controller 27, and a power supply unit 2.
It consists of an 8.2 pen recorder 29 and an operation and instruction unit 30.

The stepping unit 24 is switched channel by channel, for example from channel 0 to channel 39, by means of a synchronizing pulse obtained from the limit switch 5, which is generated every rotation of the kiln, using two stepping relays (not shown). Each time the channel is switched, the reed relay 31 corresponding to the channel is energized. reed relay 3
The No. 1 contact is connected to a variable resistor 32 of, for example, 30KΩ.

This variable resistor 32 is shown with the same reference numeral in FIG. 6, and by changing the resistance value, the measurement position can be changed.

On the other hand, in order to operate this device, determine in advance multiple positions, for example 35 positions, where you want to measure the temperature of the shell, and then set the memory unit 2.
The resistance values of the 6 variable resistors 32 are adjusted in the order of the scan numbers according to the order of their positions.

In other words, 35 measurement positions were stored with their respective resistance values. Note that the resistance value at each position is actually measured in advance and recorded as data.

Each time a synchronization pulse generated every rotation of the kiln is input to the input section of the step unit 24, the step unit 24 advances one channel at a time. Therefore, the resistance value of the memory unit 26 changes for each channel, and this resistance value is input to the recorder interface 10.

As shown in FIG. 5, inside this recorder interface 10, the resistance value of a variable resistor 33 of a monostable multivibrator M ₁ (hereinafter abbreviated as monomulti M ₁ ) is changed every rotation. It turns out. Therefore, the time constant of the recording position setting signal changes.

Therefore, the temperature signal in the circumferential direction of the position of the kiln shell, which is determined every rotation of the kiln, is input to the automatic shell temperature recording device 23.

As shown in FIG. 5, this signal S is used as an input to the two-pen recorder 29 and the instruction and operation unit 30 for recording and instructions.

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

As shown in Fig. 7, the range in which we want to know the state of occurrence of coaching is from 12 m from the left end of the kiln to 53 m from the left end of the kiln.

First, when the reflected light from the pilot lamp 21 of the optical unit 6 enters the photoelectric cell 22, a start pulse is generated as shown in _FIG . It is turned off as shown in . This off time is determined by the setting value of the variable resistor 33 of the monomulti _M1 . Also, when the output of mono multi M ₁ goes from off to on, the output of mono multi M ₂ changes to the 7th output.
It is turned off as shown in Figure D. This off time is determined by the setting value of the variable resistor 34 of the monomulti _M2 .

The temperature signal at the set position is obtained while the monomulti _M2 is off. This temperature signal is recorded by a pen recorder.

A chart speed controller 27 is attached to the recording paper of the pen recorder 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. The principle is that the rotation of the kiln motor 2 is extracted by the tachometer generator 3, this voltage is converted into pulses, and the pulses are used to rotate the pulse motor to feed the recording paper.

The temperature distribution obtained as described above and estimated coating adhesion diagrams are shown in FIGS. 8A, B and 9A, B.

Figure 8A shows 24 points from the entire temperature distribution from the 13m position to the 52m position of the kiln shown in Figure 10.
The temperature distribution from address 0 to address 9 at position m is extracted, and FIG. 8B shows the estimation of coating adhesion based on this.

In FIG. 8B, the part indicated by the reference numeral 37 corresponds to the heat-resistant brick layer, and the part 38 shown as irregular irregularities inside thereof is the coating.

That is, in FIG. 8A, 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 9A and 9B 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 manner, the adhesion state of the coating can be accurately known.

As is clear from the above description, according to the present invention, the temperature distribution of the kiln shell is measured by measuring radiant heat, and the deposition state of the coating can be detected accurately in a short time from this temperature distribution state. be able to.

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

[Brief explanation of drawings]

The figure shows one embodiment of the invention. 1st
The figure is a perspective view showing one embodiment of the present invention, Figure 2 is a block diagram showing the schematic configuration of the temperature measurement system of the device of the present invention, and Figure 3 is an explanation showing the details of the optical unit and the connection state of the control system. Figure 4 is a perspective view of the rotating housing, Figure 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, FIG. FIG. 8 is a temperature distribution diagram measured at a different time from A, B is a diagram showing the coating adhesion state at that time, and FIGS. 10 and 11 are diagrams showing the temperature 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 protrusion 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, 11 is a 4-pen recorder, 13 is a rotating housing, 14 is a mirror, 16 is a concave mirror, 17 is a fixed mirror, 18 is a photoelectric cell, 1
9 is an amplifier, 20 is a control panel, 23 is a shell temperature automatic recorder, 24 is a step unit, 25 is a sequencer unit, 26 is a memory unit, 27 is a chart speed controller, 28 is a power supply unit, 29 is a 2-pen recorder, 30 is an operation and instruction unit, 31 is a reed relay, 32, 34 are variable resistors, 35 is a pulse amplifier, 36 is a voltage converter, 37 is a refractory brick layer, and 38 is a coating.

Claims (1)

[Claims] 1. In an automatic shell temperature recording device for a rotating body that detects thermal radiant energy radiated from the surface of a shell of a rotating body and records the temperature distribution of the shell from the detected value, temperature signal output means for periodically scanning and detecting a line in the axial direction and outputting an electrical temperature signal according to the temperature value of the detected amount; an axial position setting means for setting the axial position of the shell based on the above information; a means for arbitrarily varying the axial position to be set by changing the scanning time from one end; and an axial position setting means. a gate means for outputting a temperature signal from the temperature signal output means at a set scanning timing of the axial position of the shell; and a recording means for recording the temperature over one rotation of the shell based on the temperature signal output from the gate means. An automatic shell temperature recording device for a rotating body, comprising: recording the temperature distribution around the entire circumference of the shell at a predetermined axial position, and estimating coating adhesion using a circle diagram.