JPS5823896B2 - Caking property measuring device for coal, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the caking property of coal, etc. More specifically, the present invention relates to an apparatus for measuring the caking property of coal, etc. This invention relates to a caking property measuring device (plastometer) for measuring the properties of coal, etc.

As a device for measuring the caking property of coal etc., L, Msapo
The plastometer devised by Zhnikov et al.
There is one (Soviet-style plastometer).

As shown in FIGS. 1 and 2, this plastometer has columns 1a and 1b mounted vertically on a plywood board whose levelness can be adjusted when installed, and a lever 3a with recording pens 7a and 7b attached to one end of the columns. 3b is pivoted and the sample charcoal is heated by a heating element 2 embedded in a furnace body 6 constructed of bricks on plywood from the center of the lever to the column side (4a).

The stamps 5a and sb to be inserted into the respective shafts of the levers 3a and 4b are pivoted, and the recording cylinder 8 is arranged so that the pen tips of the recording pens 7a and 7b are in contact with the surface of the recording paper, and the levers 3a,
Weights 9a and 9b are suspended on the recording pen mounting end of lever 3b via stamps 5a and 5b so that a predetermined load is applied to the sample coal in rettle 4a and 4b, and the levers 3a and 3b are used to prevent horizontal shaking. It has a structure in which guide columns 9a and 9b are erected on plywood.

This device is a combination of a penetrometer and a diradometer, and the amount of shrinkage of the sample coal when it reaches the final temperature (730°C) and the maximum value of the thickness of the softened layer are taken as both axes of a rectangular coordinate system. Plastome-□Create a tag eargram,
The viscosity of each sample coal is determined based on its position on the diagram.

This device uses the amount of shrinkage (X-index) of the sample charcoal drawn on the recording paper at its final temperature, and inserts the sample charcoal into the retort, inserts the iron rod wrapped in paper removal into the retort, and then inserts the iron rod only after filling the sample charcoal into the retort. Construct a sampling cavity, measure the thickness of the softened layer by inserting a steel needle into this cavity, create a rectangular coordinate with the maximum value of the thickness of this softened layer (X index), and preliminarily measure the thickness of the softened layer. The caking properties of each section, which is divided by seven curves and one straight line, are characterized, and the caking properties of the sample charcoal are determined based on which section it is located. This method has drawbacks such as being cumbersome and making it difficult to grasp minute features.

This invention aims to eliminate the above-mentioned drawbacks, and its features include a sample charcoal heating means for placing a sample charcoal and heating the sample charcoal to a predetermined temperature; The position of the needle pin is determined by a means for inserting the needle pin, a means for converting the resistance that the needle pin receives at the time of insertion into an electric signal, and the number of times and amount of insertion of the needle pin into the sample flame. A caking property measurement method capable of easily and reliably detecting the caking property of sample coal, comprising a means for detecting a plastic layer and a coke layer, and a means for detecting the height of the plastic layer and the height of the coke layer. It provides equipment.

An embodiment shown in this invention drawing will be described in detail below.

FIG. 3 is an external view of the caking property measuring device of the present invention, in which 21 is a plywood board, and a support 22 is mounted vertically on this plywood board.
This support includes a bearing fitting 23 for pivoting a lever 33, a blacking force sensor 24a, and a needle position sensor 24.
b is installed.

Also, on the base plate 21 is a furnace body 25 constructed of refractory bricks.
A heating element 4 such as silicon carbide is placed inside the furnace body.
An iron retort 26 in which γ is embedded and can be attached to and detached from the furnace body.
The sample charcoal placed inside can be heated to a predetermined temperature.

As shown in FIGS. 3 to 5, the needle position sensor 24a is connected to a motor (
A difference in converting the amount of compression of a stainless steel bellows 32 attached via a flange 31 to a cross spar 30 which is moved up and down by two screw shirts 29a and 29b which are rotated at low speed in the same direction by a servo motor) 28 into a change in the amount of electricity. It is composed of a coil 241 and a core 242 of a dynamic transformer, and one end of a needle pin 34 whose approximately central portion is fixed to a lever 33 pivoted to one end of the bearing fitting 23 is attached to the bellows 32. .

Note that the needle position sensor 24 attached to the support frame 27b
Similarly to the above, the coil 241 of the differential transformer and the core 242 are coaxially attached to the needle pin.

At the other end of the lever 33, there is a weight 35 that applies a predetermined load when the needle pin 34, which is elastically connected via the crossbar 30 and the bellows 32, is inserted (pierced) into the retort 26, and a weight 35 that applies a predetermined load to the arm. Sensor 36 that measures the amount of direction
is installed.

As shown in FIGS. 3 and 5, a sensor 36 for measuring the amount of tilt of the arm is connected to a coil 362 of a differential transformer attached to a support 361 vertically attached to the base plate 21 and an end of the arm 33. It consists of an attached core 363.

FIG. 5 shows a circuit that processes the outputs of the three sensors described above, outputs the viscosity of the sample coal, and controls the apparatus.

In the figure, numeral 37 denotes a time setting circuit that operates in response to a start command signal input by operating an operation button (not shown), and sends out a signal to control the motor 28 via a drive circuit 38.

This time setting circuit 37 operates at a position where the tip of the needle pin 34 comes into contact with the coke layer on the bottom of the retort 26 after the start command, and the drive circuit 38 is directly controlled by the output of an abnormality detector to be described later. connected to control a controlled drive circuit;

The differential transformer that constitutes the blacking force sensor 24a has an oscillator (not shown) on the primary side, an amplifier 401 on the secondary side, and a comparison circuit 402 connected to the output of this amplifier.
403 and an abnormality detection circuit 404 are connected in parallel, and the outputs of the comparison circuit 403 and abnormality detection circuit 404 are connected to the aforementioned drive circuit.

The above-mentioned amplifier 401, differential circuits 402, 403, and abnormality detection circuit 404 constitute the sensor output detection circuit 40, and an oscillator (not shown) is also provided on the primary side of the differential transformer that constitutes the needle position sensor 24b. But 2
On the next side, there is an amplifier 411, and sample and hold circuits 412 and 4 that hold the output of the amplifier when the output of the comparison circuit 402 and 403 is input to the output of this amplifier.
13 and an arithmetic storage circuit 414 are connected in series with the sample and hold circuit 412 to form a sensor output detection circuit 41.

Further, an oscillator (not shown) is connected to the primary side of the differential transformer configuring the sensor 36, and an amplifier 42 is connected to the secondary side. The output is inputted via a temperature converter 44 to a recorder 45, and records of both are recorded.

The output of the temperature converter 44 described above is input to the recorder 46 together with the outputs of the arithmetic storage circuit 414 and the coke layer sample and hold circuit 413 described above, so that these outputs can be recorded.

The heating element 47 includes a program setting device 48, a temperature controller 49,
Heating temperature control circuit 51 having a feedback loop composed of a control circuit (5CR) 50 and the thermometer 43
It is now controlled by.

The apparatus for measuring the caking property of coal, etc. of the present invention is constructed as described above, and the procedure for measuring the caking property of sample coal using this apparatus will be explained below.

As for the sample coal, as in the conventional case, the sample under the 1.5 m 711 sieve was filled in several batches into the retort 26 with asbestos affixed to the inner wall and bottom, and the bottom of the retort 26 was heated to 250°C in 30 minutes. , and thereafter at a rising rate of 3°C/min to 73°C.
The heating temperature control circuit 51 controls the heating element 47 so as to heat it to 0°C.

At the same time as the heating element 47 is energized or after the bottom temperature of the retort 26 reaches 250° C., a start command is given to the time setting circuit 3γ, and a normal rotation input is applied to the motor 28 via the drive circuit 38. The crossbar 30 is lowered by the rotation of the screw shirts 29a and 29b, and the needle pin 34 connected to the crossbar via the bellows 32 is inserted into the retort 26.

At this time, as the needle pin 34 descends, it receives a first resistance in the plastic layer (softened layer) and a second resistance in the coke layer, and these signals cause the motor 28 to reverse direction and rise via the drive circuit 38. and the limit switch 39
will stop at the upper limit.

When the upper limit is reached, the operation is stopped for a certain period of time (for example, 3 minutes) until the next normal rotation input is input from the time setting circuit 37, and this operation is repeated until the bottom of the retort reaches the final temperature (720° C.).

Needle pin 34 inserted into the retort 26 described above
The first and second resistance points that the bellows 32 receives are caused by the core 242 inserted between the primary and secondary coils of the differential transformer 241 that constitutes the brushing force sensor 24a1 and the needle position sensor 24b. The degree of coupling between the primary and secondary coils changes, and this change is amplified by the amplifier 401.411 and sent to the comparison circuit 402゜4.
03 and sample and hold circuits 412 and 413.

The threshold value of the comparison circuit 402 is, for example, 200 to 300 g.
This occurs when a load of r is applied to the bellows 32.

The threshold value of the comparator circuit 403 is such that it can detect the output of the differential transformer that occurs when a load of, for example, 500 to 700 gr is applied to the bellows 32. When the tip of the needle pin 34 reaches a certain plastic layer, the comparator circuit 402 outputs an output to the sample and hold circuit 412, and while this output continues, the position of the needle pin given to the input of the sample and hold circuit 4120 changes. Calculate the output and store it in the memory circuit 4
14, and this arithmetic storage circuit 414 stores the previous (n-1
The data of the current time (nth time) and the data of the current time (nth time) are averaged and output to the recorder 46.

Further, when the tip of the needle pin 34 reaches the coke layer which is the second resistance, an output is output from the comparator circuit 403 to the sample hold circuit 413, and this output is output to the recorder 46 and recorded.

As shown in FIG.
The temperature inside the retort is plotted on the Y-axis of the recorder, and the height of the plastic layer Hp1, coke, etc., from the bottom of the retort is plotted on the Y-axis, and changes in each of the above layers due to temperature changes can be continuously recorded.

Together with this record, the temperature and shrinkage rate are recorded by the recorder 45, and the caking property can be determined by viewing the record together with the record by the recorder 46 as shown in FIG.

As described above, the present invention includes a retort in which sample charcoal is placed and heated, a needle pin that moves up and down and is inserted into the sample flame in the retort, and a mechanical quantity that converts the resistance of the needle pin when inserting the sample charcoal into a mechanical quantity. A bellows to be converted, a first sensor that replaces the displacement of the bellows with a change in electrical quantity, a second sensor that detects the insertion amount of the needle pin inserted into the retort, and the first and second sensors. The blanking force amplifier and needle position detection circuit output a plastic layer and coke layer detection signal with a specific threshold value, and a plastic layer and coke layer height signal based on the above signal and a second sensor signal. The procedure can be easily and automatically measured, and the amount of change due to temperature change in the plastic layer and coke layer can be detected by directly reading the output without further conversion of the measured value, so this result can be predicted in advance. It has the effect that the caking property can be determined by comparing the measured values with patterned information in the form of an electrical signal.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a partially cut away side view of a conventional caking property measuring device, and FIGS. 3 to 6 each show an embodiment of the present invention. Figure 3 is a perspective view of the entire device, Figure 4 is a sectional view of the blacking force sensor, Figure 5 is a system diagram of the detection signal transmission system including the blanking force, needle position sensor and its output amplifier, and Figure 6 is an explanatory diagram of test result data. 21... Base plate, 22, 301... Support column, 24a. 24b, 36...sensor, 25...
Furnace body, 26... Retort, 30... Crossbar 132... Bellows, 33... Lever, 34... Needle pin, 35... ...
Weight, 40, 41...detection circuit.

Claims (1)

[Claims] 1. A retort in which sample coal is placed and heated, a needle pin that moves up and down and is inserted into the sample flame in the retort, a bellows that converts the resistance of the needle pin when inserting the sample coal into a mechanical quantity, and this bellows. a first sensor that replaces displacement with a change in electrical quantity; a second sensor that detects the insertion amount of the needle pin inserted into the retort; The viscosity of coal, etc. is characterized by comprising a brushing force amplifier and a needle position detection circuit that outputs a plastic layer, coke layer detection signal, a plastic layer and coke layer height signal based on the signal and a second sensor signal, and a needle position detection circuit. Concretion measuring device.