JP6669907B2 - Coking furnace coal level measurement method - Google Patents

Description

The present invention transmits a millimeter wave or a microwave to the surface of coal fed from a coal loading vehicle through a coal charging port of a coke oven, and receives a millimeter wave or a microwave reflected on the surface of the coal to reduce the coal filling level. The present invention relates to a measuring method using an apparatus for measuring .

  In the coke oven, a plurality of coal loading ports are provided on the upper surface, and coal is sequentially charged from the coal loading port while moving a coal loading vehicle loaded with coal. At that time, it is required to measure the coal loading level of the coal charged into the coke oven and to increase the productivity by loading as much coal as possible.

  In view of this, the present applicant has previously proposed in Patent Document 1 a measuring device as shown in FIG. In FIG. 1, a coal loading vehicle 1 is a device for sending coal C from a coal receiving hopper 10 to a coal input chute 11 by a coal feeding device 12, and along a rail 101 fixed to an upper surface of a coke oven 100, For example, it moves in the front-back direction of the paper as shown. Then, the coal car 1 stops when the coal input chute 11 reaches just above the coal charging port 102 of the coke oven 100, and drops the coal C into the furnace. At the lower end of the coal input chute 11, a sleeve 13 whose lower end is narrowed inward and is adapted to the diameter of the coal mouth 102 of the coke oven 100 is provided, and coal C is supplied through the sleeve 13. 102 is reliably dropped.

  A microwave transmitting / receiving means 20 is provided on the upper surface 1a of the coal-equipped vehicle 1, and an antenna 22 is disposed below the floor surface 1b. The transmitting / receiving means 20 and the antenna 22 are connected by a waveguide 21. . The transmission / reception unit 20 is connected to a controller 24 that performs calculations such as transmission / reception of microwaves and calculation of the coal level. By arranging the transmission / reception means 20 and the controller 24 away from the coke oven 100 in this manner, a malfunction due to heat can be prevented without using a heat insulating structure.

  Further, a reflection plate 23 is disposed so as to face the antenna 22, and a guide pipe 26 extending toward the reflection plate 23 is additionally provided. The reflecting surface 23 a of the reflecting plate 23 is inclined toward the coal loading port at an angle of 45 ° with respect to the axis A of the reflecting surface of the antenna 22, and the microwave transmitted from the antenna 22 reflects the reflecting surface of the reflecting plate 23. The light is reflected on the surface 23a, sent to the inside of the coke oven 100 through the coal opening 102, and further reflected on the surface of the coal C '(M in the figure). Then, the reflected microwave returns to the reflecting plate 23, is reflected by the reflecting surface 23a, and is received by the antenna 22.

  Further, a reflector moving means (not shown) is connected to the reflector 23 so that the reflector 23 is moved directly above the coal filling port 102 at the time of measurement, and is separated from immediately above the coal filling port 102 at the time of coal input. Move to

  Here, by using a rotating wave in which the electric field rotates in one direction clockwise or counterclockwise as the microwave, the reflected wave (M ′) from the wall surface 102a of the coal loading port 102 can be prevented from being received. Accurate measurement becomes possible.

  With such an apparatus configuration, the coal level can be accurately measured without the influence of heat.

JP 2012-188589 A

  However, in the measuring device described in Patent Literature 1, since the antenna 22, the guide pipe 26, and the reflection plate 23 are disposed below the sleeve 13, depending on the separation distance between the lower end of the sleeve 13 and the coke oven 100, They may not be installed. In addition, the reflector 23 must be moved from just above the coal opening 102 at the time of coal loading and at the time of measurement, and a reflector moving means is separately required.

  Further, since the reflector 23 and the antenna 22 are close to the coal opening 102, dust from the coke oven 100 adheres to the reflection surface 23a of the reflector 23 and the antenna surface of the antenna 22 during measurement, which adversely affects measurement accuracy. May also occur.

  Therefore, the present invention provides a coke oven coal level measurement device that can be installed irrespective of the distance between the sleeve of the coal input chute and the coke oven, does not require a means for moving the reflector, and further has dust from the coke oven. And to prevent the effects of heat.

The present invention provides the following coke oven coal level measurement method to achieve the above object.
(1) A millimeter wave or a microwave is transmitted from a coal receiving hopper of a coal loading vehicle to a coal input chute by a coal feeding device, and is transmitted to the surface of the coal supplied into the coke oven through the coal input chute. In order to measure the coal level by receiving the reflected wave of the millimeter wave or microwave reflected in the, a measuring method using a device installed inside the coal-powered car,
An opening is provided on the ceiling surface of the coal input chute, on the opposite side of the coal feeder from the central axis of the coal input chute, and the opening is connected to a millimeter-wave or microwave transmission / reception means by a guide pipe. And
At a position on the opposite side of the coal feeder than the central axis of the coal input chute, while performing transmission and reception by millimeter waves or microwaves,
Reduce the amount of coal supplied from the coal feeder, to form a region where the coal does not fall on the side opposite to the coal feeder than the central axis of the coal input chute, or a region where the amount of fall is small, A method for measuring a coal level in a coke oven, wherein the level is measured by performing the transmission and reception through a region.
(2) The above (1), wherein the amount of coal supplied from the coal supply device is reduced in the latter half of the coal loading operation, and the coal loading level is measured during the period from the latter half to the end of the coal loading operation. Method for measuring coal level in coke ovens.
( 3 ) The method for measuring the coking oven coal level according to the above ( 1 ) or (2) , wherein a purge gas is supplied into the guide pipe at least at the time of measurement.
( 4 ) A dustproof / heatproof filter is attached to the coal input chute by closing the opening, and the guide pipe is connected to the dustproof / heatproof filter,
The dustproof / heatproof filter is, in order from the coal charging chute side, a gas-permeable filter made of a heat-resistant material that transmits millimeter waves or microwaves, and a non-permeable heat-insulating material made of a heat-resistant material that transmits millimeter waves or microwaves. The coke oven charging level according to the above item ( 3 ) , wherein the plate and the plate are spaced apart and surrounded by a frame, and a purge gas is supplied to a space between the filter and the heat insulating plate. Measurement method .
( 5 ) The guide pipe is an L-shaped pipe, and has a first reflecting plate at a 90 ° bent portion thereof,
One end accommodates the antenna of the transmitting and receiving means,
The other end is provided with a second reflection plate facing both the reflection surface of the first reflection plate and the opening of the coal input chute, any one of ( 1 ) to ( 4 ) above. The method for measuring the level of coal in a coke oven according to the above.
( 6 ) The filter of the dust-proof / heat-proof filter is a planar woven filter in which fibers made of a heat-resistant material that transmits millimeter waves or microwaves are woven in a planar shape to provide air permeability, or the fibers are processed into a bag shape. ( 5 ) The method for measuring the level of coal in a coke oven according to the above ( 4 ), wherein the filter is a bag-shaped woven filter having air permeability.
(7) millimeter wave or Sosumi level measurement method coke oven according to any one of the above is characterized by the use of a rotating wave of the microwave (1) to (6).
( 8 ) The method according to any one of the above (1) to ( 7 ), wherein the coal filling level is measured during the coal loading, and a signal for stopping the coal loading is output when the optimum level is reached. Coking furnace coal level measurement method.

  In the coal loading level measuring device of the present invention, transmission and reception are performed at a position opposite to the coal feeder with respect to the central axis of the coal feed chute, and the amount of coal fed from the coal feeder is reduced to reduce the amount of coal feed chute. By forming an area where coal does not fall on the opposite side of the coal feeder from the central axis, or an area where the amount of fall is small, and by transmitting and receiving through this area, the coal supplied from the coal feeder and falling The coal level can be measured without being affected by reflection. In addition, since the transmitting and receiving means and the opening of the ceiling surface of the coal input chute are connected by a guide pipe and the entire apparatus is housed in the coal-carrying car, it can be installed regardless of the separation distance between the sleeve of the coal input chute and the coke oven. Further, there is no need to move the reflector directly above the coal port of the coke oven or separate the reflector from the coal port between the time of measurement and the time of coal charging, so that there is no need to move the reflector. Moreover, the level of coal loading can be measured during coal loading. Furthermore, since the purge gas is supplied into the guide pipe, dust can be prevented from entering, and heat from the furnace can be shut off by installing a dustproof / heatproof filter on the ceiling surface of the coal input chute of the coal-equipped truck. In addition, the intrusion of dust can be further prevented, and transmission and reception become better.

It is a sectional view showing the basic composition of the coal leveling device of the present invention. It is sectional drawing which shows a dustproof / heatproof filter. It is sectional drawing which shows the other example (bag-shaped textile filter) of a dust-proof / heat-proof filter. It is sectional drawing which shows the coal-charging level measuring apparatus using the L-shaped pipe as a guide pipe. It is a sectional view showing an example of a coal level measurement device of the present invention. It is a mimetic diagram for explaining a method of obtaining a coal level from a beat wave by sweep. It is sectional drawing which shows the coal level measuring device of patent document 1.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the basic configuration of a coal level measuring device of the present invention. The entire device is installed inside a general coal loading vehicle 1. As shown in FIG. 7, the coal-equipped vehicle 1 includes a coal receiving hopper 10 that stores coal C supplied from the outside and a coal feeder 12 that sends the coal C from the coal receiving hopper 10 to a coal input chute 11. And The coal feeder 12 is generally a screw feeder, a table feeder, or the like. Further, a sleeve 13 having a lower end narrowed inward and fitted to the diameter of the coal charging port 102 of the coke oven 100 may be provided at the lower end of the coal input chute 11. Then, the coal-equipped car 1 moves along the rail 101 fixed to the upper surface of the coke oven 100, for example, in the front-rear direction on the paper as illustrated.

  An opening 11b is formed at the center of the ceiling surface 11a of the coal input chute 11, and one end of the guide pipe 40 is attached to the opening 11b. The other end of the guide pipe 40 is provided with the antenna 22 of the transmitting / receiving means 20. Note that the guide pipe 40 is a straight pipe extending directly upward from the opening 11b in the illustrated example, but may be an L-shaped pipe having a reflection plate provided at a bent portion (see FIG. 4).

  Further, a gas supply port 35 is provided near the antenna 22 on the side wall of the guide pipe 40, and a purge gas such as a nitrogen gas or air is supplied. The projecting opening (not shown) of the gas supply port 35 in the guide pipe is preferably formed so as to be inclined downward toward the inner wall of the guide pipe 40 and toward the opening 11 b of the coal input chute 11. As a result, as shown in the figure, the purge gas spirally flows along the inner wall of the guide pipe 40 toward the opening 11b of the coal input chute 11 and is discharged from the opening 11b, so that the dustproof effect is obtained. Increase.

  Although not shown, the transmission / reception means 20 controls transmission / reception of millimeter waves or microwaves, processes received signals, and the like by a controller (reference numeral 24 in FIG. 7). Further, the transmitting / receiving means 20 and the controller may be unitized.

  In the coal level device configured as described above, at the time of measurement, as indicated by the arrow in the figure, the millimeter wave or microwave from the transmitting / receiving means 20 is transmitted from the antenna 22 and propagates through the guide pipe 40. It proceeds to the coal input chute 11 and the sleeve 13, and passes through the coal mouth 102 to the inside of the coke oven 100. Then, the millimeter waves or microwaves reflected on the surface of the coal C ′ deposited in the furnace are received by the transmission / reception means 20 via a reverse path. Then, the controller calculates the coal C ′ deposition level based on the time difference between the transmission and reception of the millimeter wave or the microwave. Further, by supplying the purge gas at least at the time of measurement, preferably at all times, dust intrusion into the guide pipe 40 is prevented, so that good transmission and reception are performed.

  Further, since the transmission / reception means 20, the antenna 22, and the guide pipe 40 are housed inside the coal-equipped vehicle 1, it can be installed regardless of the distance between the sleeve 13 of the coal input chute 11 and the coke oven 100. There is no need to move the reflection plate 23 (see FIG. 7) as in Document 1.

  Further, as shown in FIG. 2, the dustproof / heatproof filter 30 may be attached by closing the opening 11b. The dustproof / heatproof filter 30 is made of a heat-resistant material, transmits a millimeter wave or a microwave, and does not transmit a gas. A large number of through holes 32 a are formed in the filter plate 32, which is separated from the filter plate 32 having air permeability, and is surrounded by a frame 33. The heat insulating plate 31 and the filter plate 32 can be made of, for example, ceramic.

  Further, the frame 33 is provided with a gas supply port 35 for supplying a purge gas to the space S between the heat insulating plate 31 and the filter plate 32. The partition wall 36 may be provided on the inner wall of the frame 33, and the partition wall 36 may be formed with a projecting opening 37 inclined toward the filter plate. Thereby, the gas for purging from the gas supply port 35 is efficiently supplied to the filter plate 32 and flows out to the opening 11b through the through-hole 32a, so that intrusion of dust can be prevented.

  The dustproof / heatproof filter 30 is airtightly mounted on the opening 11b such that the filter plate 32 is on the coal input chute side.

  By the way, since the filter plate 32 is a rigid body such as a ceramic plate, the filter plate 32 does not vibrate even if the purge gas is supplied into the frame and flows out from the through hole 32a. For this reason, it is difficult to remove dust adhering to a portion other than the through hole (the lower surface of the hatched portion in the drawing) of the surface on the coal input chute side even if the purge gas flows out from the through hole 32a. If the amount of adhering dust is too large, it will affect the transmission and reception of millimeter waves or microwaves. Therefore, it is necessary to remove the dustproof / heatproof filter 30 from the coal charging chute 11 and remove the adhering dust.

  Therefore, instead of the filter plate 32, a woven fabric (a planar woven filter) made of a heat-resistant material that transmits a millimeter wave or a microwave, for example, a ceramic fiber, which is woven in a planar shape to have air permeability, is used for the frame 33. It may be stretched. Since this planar woven fabric filter is soft and flexible, when the purging gas is supplied into the frame or when the purging gas flows out through the gap between the fibers (corresponding to the through hole 32a). It can vibrate and shake off attached dust. In addition, as a ceramic fiber that transmits a millimeter wave or a microwave, for example, “Tyranno fiber” manufactured by Ube Industries, Ltd. can be used. The Tyranno fiber is a ceramic fiber made of silicon, titanium, zirconium, carbon and oxygen, and a woven fabric thereof becomes a flexible member having heat resistance and air permeability.

  Further, as shown in FIG. 3, a bag-shaped woven fabric filter 32A in which the above-described woven fabric is formed into a bag shape is formed so as to hang down toward the coal input shooter side by its own weight, as shown in FIG. It may be attached to the body 33. However, as shown in the drawing, the lower end of the bag-shaped woven filter 32A is located above the opening 12a of the coal-supplying device 12 so that the coal C from the coal-supplying device 12 does not hit the bag-shaped woven filter 32A. I do. In addition, since the bag-shaped woven fabric filter 32A is made of a fiber material that transmits millimeter waves and microwaves, even if it is curved, it does not affect transmission and reception of millimeter waves and microwaves.

  Further, the guide pipe 40 may be an L-shaped pipe as shown in FIG. The guide pipe 40A made of an L-shaped pipe has a first reflection plate 41 at a 90 ° bent portion, a transmission / reception means 20 connected to one end, and a second reflection plate at the other end. A plate 42 is provided. Although the other end is preferably attached to the dustproof / heatproof filter 30 as shown, it may be attached directly to the opening 11b of the coal input chute 11. The first reflector 41 and the second reflector 42 are both 45 ° reflectors, and the reflection surface of the first reflector 41 is oriented so as to face the reflection surfaces of the transmitting / receiving means 20 and the second reflector 42. The second reflecting plate 42 is inclined downward by 45 ° so as to face the reflecting surface of the first reflecting plate 41 and the coal feeding chute 11.

  In the guide pipe 40A, an antenna 22 connected to the transmitting / receiving means 20 is accommodated in a straight pipe portion 40a connecting the transmitting / receiving means 20 and the first reflecting plate 41. The first reflector 41 and the second reflector 42 are connected by a horizontal tube 40b. Further, the second reflecting plate 42 is provided with a hanging portion 40c facing the coal input chute 11, and the hanging portion 40c is fixedly connected to the opening 11b or the dustproof / heatproof filter 30.

  In the guide pipe 40A, the transmission / reception means 20 (and the controller) can be separated from the high temperature coke oven 100. In order to make the transmitting / receiving means 20 farther from the coke oven 100, the guide pipe 40A can be made longer by increasing the number of reflectors.

  Also in the guide pipe 40A, since the antenna 22 and the guide pipe 40 are housed inside the coal-equipped car 1, the antenna 22 and the guide pipe 40 can be installed regardless of the separation distance between the sleeve 13 of the coal input chute 11 and the coke oven 100. It is not necessary to move the reflection plate 23 (see FIG. 7) as in FIG.

  Then, at the time of measurement, as indicated by the arrow in the figure, the millimeter wave or the microwave from the transmission / reception means 20 is transmitted from the antenna 22 and propagates through the straight pipe portion 40a of the guide pipe 40A, and the first reflection plate 41 After that, the light propagates through the horizontal tube portion 40b and is reflected again by the second reflecting plate 42, and then propagates through the hanging portion 40c, and passes through the opening 11b of the coal input chute 11 or the dustproof / heatproof filter 30. To the coal input chute 11. Next, the millimeter-waves or microwaves reflected from the surface of the coal C ′ deposited in the coke oven from the coal input chute 11 through the coal mouth 102 of the coke oven 100 into the oven are different from those in the past. The data is received by the transmission / reception means 20 via the reverse route. Then, the controller calculates the coal C 'deposition level based on the time difference between the transmission and reception of the millimeter wave or the microwave.

  By the way, the millimeter wave or microwave reflected by the coal C 'in the furnace is further reflected by the wall surface 102a of the coal loading port 102 or the inner wall of the coal charging chute 11 and is incident on the second reflecting plate 42, where the transmitting / receiving means is provided. 20 (R 'in FIGS. 1 and 4). When such an unnecessary wave is received, it appears as a peak at a position different from the original coal loading level. Therefore, it is preferable to use a rotating wave in which the electric field rotates in one direction clockwise or counterclockwise. Since this rotating wave has a property that the rotating direction is reversed by reflection, the millimeter wave or microwave (R) reflected only on the surface of the coal C ′, the wall surface 102 a of the coal loading port 102, the coal input chute 11 Since the number of times of reflection is different from that of the millimeter wave or microwave (R ′) further reflected by the inner wall of the device, the received millimeter wave or microwave can be distinguished in the direction of rotation of the electric field.

  That is, for example, when a clockwise rotation wave is transmitted, the clockwise rotation wave is reflected twice by the first reflection plate 41 and the second reflection plate 42 to become a clockwise rotation wave and is incident on the coal C ′. Then, it is reflected on the surface of the coal C ′ and becomes a counterclockwise rotation wave, and is reflected on the second reflection plate 42 and the first reflection plate 41 and received as a counterclockwise rotation wave. On the other hand, for example, when reflected on the inner wall of the coal input chute 11, the counterclockwise rotation wave reflected on the surface of the coal C ′ is reflected on the inner wall of the coal input chute 11, and the clockwise rotation wave is reflected on the inner wall of the coal input chute 11. Then, the light is reflected by the second reflection plate 42 and the first reflection plate 41 and received as a clockwise rotation wave. Therefore, by receiving only the counterclockwise rotation wave, the rotation wave (R ′) reflected on the inner wall of the coal input chute 11 can be eliminated, and an accurate coal loading level can be detected.

  In order to generate a rotating wave, a known method may be used. For example, a 90 ° phase plate made of a dielectric material may be mounted in a waveguide connecting the transmitting / receiving means 20 and the antenna 22.

  Further, it is preferable to use a millimeter wave as a detection medium. As shown in the figure, the coal C charged into the furnace is normally deposited in a conical shape having a vertex near the center just below the center of the coal filling port 102, and the surface of the coal C 'immediately after the coal charging is entirely uneven. become. Then, since the microwave or the millimeter wave enters with the center of the coal loading port 102 as the axis, the microwave or the millimeter wave enters the inclined surface of the cone of the coal C 'and is reflected. Since the microwave has a small scattering angle, when reflected on the inclined surface, the reflected wave mainly in the horizontal direction in the drawing, or diagonally upward or diagonally downward is mainly used, and the microwave is directly above the guide pipe 40 and the transmission / reception means 20. Since the number of reflected waves in the direction is reduced, it is difficult to perform good transmission and reception. Therefore, the level of coal is measured after leveling the surface of the coal C 'using a leveler after coal is coalesced.

  Millimeter waves, on the other hand, have a larger scattering angle than microwaves, so even if they are reflected on an inclined surface, they are reflected in various directions and the reflected waves in the upward direction are more than when microwaves are used. , Reception can be performed satisfactorily. Therefore, it is possible to measure the coal loading level without performing a leveling operation immediately after coal loading. However, the measured coal level is the coal level near the apex of the cone, and is different from the flat coal level. Therefore, the measured coal level is regarded as the top of the cone, the volume of the cone is calculated to determine the coal amount of the coal C ′ deposited in each cone, and the case where the recess is filled and flattened is considered. Assuming the coal level is assumed. Also, after the coal is charged, the surface of the coal C 'is flattened using a leveler, and then the coal loading level is measured, and it can be confirmed whether or not the estimated coal loading is correct.

  In addition, the millimeter wave can reduce the diameter of the antenna 22 and the diameter of the guide pipe 40 as compared with the microwave, and accordingly, the dust-proof and heat-proof filter 30 can be reduced in size, so that the space S also has a small capacity. The gas works more efficiently and the dust-proof effect is further enhanced.

  Further, the beam diameter of the millimeter wave can be smaller than that of the microwave. As shown in FIG. 5 (shown here in accordance with the configuration of FIG. 4), the dust-proof / heat-proof filter 30 is located on the opposite side of the central axis O of the coal feeding chute 11 from the opening 12 a of the coal feeder 12 (in the figure). (Right side) and millimeter waves are propagated in the same manner as above. Thus, the millimeter wave travels to the coke oven 100 not through the central axis O of the coal input chute 11 but through the space on the opposite side of the opening 12a of the coal feeder 12. During the coal filling operation, usually, the coal C falls through the entire inside of the coal input chute 11, but by reducing the amount of coal supplied from the coal supply device 12, the opening 12 a is larger than the central axis O of the coal input chute 11. On the opposite side, there is a region where the coal C does not fall or the amount of fall is small. Therefore, by using a millimeter wave, by reducing the amount of coal supplied from the coal supply device 12 in the latter half or near the end of the coal-charging operation, the coal-charging level is measured without being affected by the reflection by the falling coal C. can do.

  In addition, as shown in FIG. 5, a configuration in which the dustproof / heatproof filter 30 is mounted to be shifted from the central axis O of the coal injection chute 11 can be performed by microwaves by expanding the diameter of the coal injection chute 11.

  The coal level is usually performed after the coal filling operation is completed, but if the coal level can be measured at the same time as the coal filling operation, the coal level can be adjusted quickly.

  As a method of measuring the coal level at the same time as the coal loading operation, a sweep is performed several times during coal loading, and a beat wave with the reflected wave from the falling coal is generated for each sweep. The coal level can also be determined from the spectrum obtained by summing all the beat waves. In this case, both a millimeter wave and a microwave can be used as a detection medium.

  When the falling coal C is irradiated with a millimeter wave or a microwave and the sweep is performed a plurality of times, a beat wave with a reflected wave is generated for each sweep, but the beat wave generated in each sweep is other sweep waves. The phase of the beat wave is different from that of the beat wave generated in step (1). Therefore, when the beat waves generated for each sweep are added together, beat waves of various phases overlap, and the amplitude hardly changes as a whole. On the other hand, since the falling coal C continues to accumulate immediately below the coal loading port 102, the reflected wave reflected at this position generates a beat wave having the same phase even if the number of sweeps changes. Therefore, when the beat waves at this position are added together, the amplitude increases by the number of sweeps. This is equivalent even after the FET processing.

  That is, as shown in FIG. 6, although the peak position (phase) is slightly different between the beat wave of the first sweep (FIG. 6A) and the beat wave of the n-th sweep (FIG. 6B), the amplitude is small. Then, when all the beat waves up to the end of the sweep are summed up, the reception intensity from the falling coal C becomes the first or n-th sweep as shown in FIG. On the other hand, while the level is almost the same as the first time, the amplitude of the bead wave generated by the coal that is continuously deposited just below the coal mouth 102 is added to the large peak A. By detecting, the coal loading level can be detected simultaneously with the coal loading.

DESCRIPTION OF SYMBOLS 1 Coal loading car 10 Coal receiving hopper 11 Coal charging chute 12 Coal feeding device 20 Transmission / reception means 22 Antenna 30 Dustproof / heatproof filter 31 Insulation board 32 Filter board 32A Bag-shaped textile filter 33 Frame 35 Gas supply port 40 Guide pipe 40A Guide pipe 41 First reflector 42 Second reflector 100 Coke oven 101 Rail 102 Charging port C, C ′ Coal

Claims (8)

It is sent from the coal receiving hopper of the coal-equipped car to the coal input chute by the coal feeding device, transmits millimeter waves or microwaves to the surface of the coal supplied into the coke oven through the coal input chute, and is reflected on the surface of the coal. In order to measure the coal level by receiving a reflected wave of millimeter waves or microwaves, a measuring method using a device installed inside the coal-loaded car,
An opening is provided on the ceiling surface of the coal input chute, on the opposite side of the coal feeder from the central axis of the coal input chute, and the opening is connected to a millimeter-wave or microwave transmission / reception means by a guide pipe. And
At a position on the opposite side of the coal feeder than the central axis of the coal input chute, while performing transmission and reception by millimeter waves or microwaves,
Reduce the amount of coal supplied from the coal feeder, to form a region where the coal does not fall on the side opposite to the coal feeder than the central axis of the coal input chute, or a region where the amount of fall is small, A method for measuring a coal level in a coke oven, wherein the level is measured by performing the transmission and reception through a region. The coke oven according to claim 1, wherein the amount of coal supplied from the coal supply device is reduced in the latter half of the coal-charging operation, and the coal-charging level is measured within a period from the latter half to the end of the coal-charging operation. Coal level measurement method . The guide Sosumi level measurement method of the coke oven according to claim 1 or 2 wherein the purge gas into the pipe and supplying at least the measurement. A dustproof / heatproof filter is attached by closing the opening of the coal charging chute, and the guide pipe is connected to the dustproof / heatproof filter,
The dustproof / heatproof filter is, in order from the coal charging chute side, a gas-permeable filter made of a heat-resistant material that transmits millimeter waves or microwaves, and a non-permeable heat-insulating material made of a heat-resistant material that transmits millimeter waves or microwaves. 4. The coking furnace coal level measurement according to claim 3 , wherein the plate and the plate are spaced apart and surrounded by a frame, and a purge gas is supplied to a space between the filter and the heat insulating plate. How . The guide pipe is an L-shaped pipe, provided with a first reflector at a 90 ° bent portion thereof,
One end accommodates the antenna of the transmitting and receiving means,
According to any one of claims 1 to 4, characterized in that it comprises a second reflector facing the both of the opening of the reflecting surface and the coal input chute of the other end first reflector Coking furnace coal level measurement method . A filter of the dust-proof / heat-proof filter is a planar woven filter in which fibers made of a heat-resistant material that transmits millimeter waves or microwaves are woven in a planar shape to provide air permeability, or air permeability obtained by processing the fibers into a bag shape. 5. The method for measuring a coal loading level of a coke oven according to claim 4, wherein the filter is a bag-shaped woven filter provided with. Sosumi level measurement method coke oven according to any one of claim 1 to 6, wherein the use of rotating waves of the millimeter-wave or microwave. The coking oven coaling level according to any one of claims 1 to 7 , wherein the coaling level is measured during coal coaling, and a signal for stopping coal coaling is output when the coal level reaches an optimum level. Measurement method .

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