JP6758643B2 - Adhesion state detection method of coal loading level measuring device - Google Patents

Description

According to the present invention, in a coal loading level measuring device for measuring the amount of coal deposited in a coke oven, the state of adhesion of coal, dust, and gas coagulant to the propagation path of a detection wave is detected to accurately perform cleaning. Regarding how to judge.

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

Therefore, the applicant has previously proposed in Patent Documents 1 and 2 an apparatus for transmitting microwaves into a coke oven, receiving microwaves reflected on the surface of coal, and measuring the coal charge level. There is.

FIG. 1 is a diagram showing a coal loading level measuring device of Patent Document 2. The coal loading level measuring device includes a guide pipe 40, and one end of the guide pipe 40 is connected to the opening 11b of the ceiling surface 11a of the coal input chute 11 of the coal loading vehicle 1. Further, an antenna 22 and a microwave transmission / reception device 20 are attached to the other end of the guide pipe 40.

The coal loading vehicle 1 includes a coal receiving hopper 10, a coal supply device 12, and a coal input chute 11, and moves along a rail 101 on the upper surface of the coke oven 100. Then, the coal input chute 11 stops at a position directly above the coal charging port 102 of the coke oven 100, and the coal C of the coal receiving hopper 10 is sent to the coal input chute 11 by the coal supply device 12 and into the furnace through the sleeve 13. Drop it. After the coal C is dropped, as shown by the reference numeral R in the figure, the microwave from the transmission / reception device 20 is propagated through the guide pipe 40 and transmitted into the furnace through the coal input chute 11 to deposit the coal C'. The microwave reflected on the surface is received by the transmitter / receiver 20 to detect the deposition level of coal C'.

Japanese Unexamined Patent Publication No. 2012-188589 Japanese Unexamined Patent Publication No. 2015-172184

As in Patent Document 2, in the coal loading level measuring device having a guide pipe 40 and connecting the guide pipe 40 to the coal input chute 11, coal C', dust, and gases blown up from the inside of the furnace are loaded. It invades the coal input chute 11 through the coal port 102, and coal C'and the like adhere to the inner wall of the guide pipe 40 and the antenna 22. Therefore, purging gas is supplied to the guide pipe 40 from the gas supply port 35 to prevent their intrusion and adhesion. Further, a dust-proof / heat-proof filter made of a heat-insulating material is placed on the coal input chute side, and a non-breathable heat-insulating plate made of a heat-insulating material is arranged above the coal injection chute, and the dust-proof / heat-proof filter surrounded by a frame is referred to as a guide pipe 40. In addition to being interposed between the coal input chute 11, purging gas is supplied to the space between the filter plate and the heat insulating plate, and the purging gas is ejected from the filter plate to the coal input chute side. (See FIG. 3; reference numeral 30).

However, even if the purging gas is supplied to the guide pipe 40, the intrusion of coal C', dust, and gases cannot be completely prevented, and the coal C is applied to the inner wall of the guide pipe 40 and the antenna 22 during the coal loading operation. ′, dust, and gas coagulant continue to adhere. Further, when the dustproof / heatproof filter is provided, coal C', dust, and gas coagulated matter continue to adhere to the dustproof / heatproof filter. As a result, the transmission intensity and the reception intensity of the microwave are attenuated to reduce the measurement accuracy, and in some cases, transmission / reception may suddenly become impossible. A shutter (see FIG. 2; reference numeral 50) for opening and closing the coal input chute 11 is attached to open the shutter during measurement and close the shutter during non-measurement, but coal is still applied to the coal input chute 11 during measurement. C', dust, and gases invade. Therefore, the guide pipe 40, the antenna 22, and the like are cleaned regularly, but since the coal loading work is stopped during the cleaning, there is a strong demand to prevent cleaning that does not affect transmission and reception.

Therefore, according to the present invention, unnecessary cleaning is performed by accurately detecting the adhesion state of coal or the like to the propagation path of the detection wave such as a guide pipe or an antenna in the coal loading level measuring device and determining the necessity of cleaning. The purpose is to increase the efficiency of coal loading work.

The present invention provides the following method for detecting the adhesion state of the coal loading level measuring device in order to solve the above problems.
(1) Attached to a coal loading vehicle, a detection wave is transmitted into the furnace through a coal charging port of a coke oven, and the detection wave reflected on the surface of coal dropped from the coal loading vehicle is received to charge the coal. It is a method of detecting the adhering state of the deposit to the propagation path of the detection wave in the coal loading level measuring device for measuring the coal level.
After installing the coal charge level measuring device and before the first coal charge operation, transmission and reception are performed on a surface other than the coal charge port of the coke oven to measure the reference reception strength I ₀ .
At any time Sosumi work, the reception intensity I _m and to transmit and receive at the same conditions when measuring the reference reception intensity I ₀ was measured, the reception intensity I _m than the reference reception intensity I ₀ A method for detecting an adhesion state of a coal loading level measuring device, which determines that it is time to clean the propagation path when it is attenuated to a predetermined value or less.
(2) Attached to the coal loading vehicle, the detection wave is transmitted into the furnace through the coal charging port of the coke oven, and the detection wave reflected on the surface of the coal dropped from the coal loading vehicle is received to load the coal. It is a method of detecting the adhering state of the deposit to the propagation path of the detection wave in the coal loading level measuring device for measuring the coal level.
The propagation path includes the coal input chute of the coal loading vehicle and installs a reflector that blocks the coal input chute .
Prior to the first coal loading operation, the coal input chute is blocked with the reflector to transmit and receive, and the reference reception strength I ₀ is measured.
At any time Sosumi work, the reception intensity I _m and to transmit and receive at the same conditions when measuring the reference reception intensity I ₀ was measured, the reception intensity I _m than the reference reception intensity I ₀ A method for detecting an adhesion state of a coal loading level measuring device, which determines that it is time to clean the propagation path when it is attenuated to a predetermined value or less.

According to the present invention, after assembling the Sosumi level measuring device, compared with the reference reception intensity I ₀ was measured before the first Sosumi work, and a reception intensity I _m measured at any time Sosumi work However, since the cleaning time is determined when the amount of attenuation falls below the threshold value, unnecessary cleaning that does not affect transmission and reception is reduced, and the coal loading work can be performed more efficiently than in the case of regular cleaning.

It is sectional drawing which shows the carbon charge level measuring apparatus described in Patent Document 2. It is a figure which shows the case where the shutter is attached to the coal charge level measuring apparatus shown in FIG. It is sectional drawing which shows the other example of the coal charge level measuring apparatus. (A) is an enlarged view showing the connecting portion between the guide pipe of the coal loading level measuring device shown in FIG. 3 and the coal input chute, and (B) is a view of the hanging portion of the guide pipe viewed from above. ..

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

The present invention is applied to a coal loading level measuring device that measures the amount of coal deposited in a coke oven dropped from a coal loading vehicle by transmitting and receiving a detection wave through a coal charging port. Therefore, if it is a coal-loaded level device having such a configuration, the device itself is not limited, and the coal-loaded level measuring device shown in FIG. 1 can be exemplified. The device configuration and the transmission / reception mode of the detected wave are described above. That's right, and the explanation is omitted. As the detection wave, a millimeter wave can be used in addition to the microwave.

In the present invention, after assembling the guide pipe 40 of the coal charging level measuring device to the coal charging chute 11 of the coal charging vehicle 1, and before the first coal charging operation, the coal charging vehicle 1 is installed and the coal charging chute 11 is the coke oven 100. The coal is moved so as to be located at a position other than the coal charging port 102, and the reception intensity is measured by transmitting and receiving by the detection wave at that position. This measured value is the reception intensity in a state where coal C'and the like are not attached to the guide pipe 40 and the antenna 22, and this is set as the reference reception intensity I ₀ .

After obtaining the reference reception strength I ₀ , normal coal loading work is performed. Then, each time Sosumi work, or for every predetermined number of times, the same conditions as when the reference reception intensity I ₀ was measured, i.e. at the same place, measures the reception intensity I _m by performing the transmission and reception by the detection wave at the same output ..

Then, by comparing the reception intensity I _m and the reference reception intensity I _0, obtaining the attenuation amount from the reference reception intensity I ₀ of the reception intensity I _m. Since the measurement conditions are the same, coal C 'when there is no adhesion of the like, the reception intensity I _m is the same value as the reference reception intensity I _0, coal C' in the adhesion amount and the like are attached The attenuation of the reception intensity also increases accordingly. Then, when this attenuation is lower than the threshold value (for example, 50%), it is determined that cleaning is necessary. Conventionally, cleaning is performed regularly regardless of the amount of coal C'etc. attached, and cleaning is performed even if it does not necessarily affect transmission and reception. On the other hand, according to the present invention, cleaning is performed only when the amount of attenuation falls below the threshold value, in other words, only when the transmission / reception is adversely affected, so that unnecessary cleaning is eliminated and the coal loading work can be performed efficiently. it can.

In order to obtain the reference reception strength I ₀ , in addition to transmitting and receiving at a place other than the coal charging port 102 as described above, as shown in FIG. 2, a shutter 50 is attached to the coal charging chute 11 and the shutter 50 is closed. It is also possible to transmit and receive by the detection wave in this state, and set the reception intensity to the reference reception intensity I ₀ . When the shutter 50 is attached, the position of the coal loading wheel 1 is irrelevant, and the coal input chute 11 may be located directly above the coal loading port 102.

It can also be applied to a coal loading level device in which the guide pipe 40 is a bent pipe body. As shown in FIGS. 1 and 2, a vertical guide pipe 40 is connected to the ceiling surface 11a of the coal input chute 11 depending on the size and shape of the coal receiving hopper 10 and the positional relationship between the coal receiving hopper 10 and the coal input chute 11. Sometimes you can't. Further, since the transmission / reception device 20 is directly above the coal charging port 102, it is easily received heat from the coal charging port 102, but it can be separated from the coal charging port 102 by bending the guide pipe 40. It can also be thermally protected.

FIG. 3 is an example thereof, and shows a guide pipe 40A made of an L-shaped pipe. An antenna 22 and a transmission / reception device 20 are attached to one end of the guide pipe 40A, and the other end is connected to a coal input chute 11. One end of the guide pipe 40A is a straight pipe portion 40a, and the end portion is bent by 90 ° so that the horizontal portion 40b is continuous. The other end of the horizontal portion 40b is bent 90 ° to form a hanging portion 40d toward the coal input chute 11, and has an L shape as a whole. Further, the 90 ° bent portion between the straight pipe portion 40a and the horizontal portion 40b is inclined at 45 ° to form the first reflector 41, and 90 between the horizontal portion 40b and the hanging portion 40c. The ° bent portion is inclined at 45 ° to form the second reflector 42. The antenna 22 is housed in the straight tube portion 40a, and the detection wave from the transmission / reception device 20 propagates through the straight tube portion 40a and is reflected by the first reflector 41, and the horizontal portion 40b is reflected. After propagating, it is further reflected by the second reflector 42, and then propagates through the hanging 40c to the coal input chute 11. In this guide pipe 40A, the transmission / reception device 20 can be separated from the coal charging port 102 to protect it from heat.

In such a guide pipe 40A, coal C'and the like are likely to adhere to and deposit on the second reflector 42, the horizontal portion 40b, and the first reflector 41. Therefore, in the same manner as above, before the first coal loading work, transmission / reception is performed at a place other than the coal charging port 102 to measure the reference reception strength I _0, and each time the coal charging work is performed or every predetermined number of times. The reception intensity _Im is measured by transmitting and receiving with the detected wave under the same conditions, and the cleaning time is determined from the amount of attenuation.

Further, a shutter 50 may be attached to the coal charging chute 11 and transmission / reception may be performed with the shutter 50 closed to obtain a reference reception intensity I ₀ .

Alternatively, as shown in FIG. 4A, instead of the shutter 50 as a reflector, a ring 51 is placed between the hanging portion 40c of the guide pipe 40A and the coal input chute 11 and a part of the inner peripheral side of the ring 51. (Hereinafter, “protruding portion 51”) may be interposed so as to protrude inward of the hanging portion 40c. As shown in FIG. 3B, the ring 51 may have a part of the annulus cut off. Since the detection wave propagates in the guide pipe 40A, the detection wave is reflected by the protruding portion 51a of the ring 51, and the reflected wave is received by the transmission / reception device 20. Then, transmission and reception are performed before the first coal loading operation to obtain the reference reception strength I ₀ .

In the above, when the attenuation amount from the reference reception intensity I ₀ of the reception intensity I _m is equal to or less than a threshold value, or displayed on a monitor, and the like issuing an alarm, instrumentation at monitoring and notification means (not shown) The charcoal worker may be notified.

Further, as a coal loading level measuring device not provided with the guide pipe 40, the present invention can be applied to, for example, the coal loading level measuring device described in Patent Document 1. This coal loading level measuring device is equipped with a reflector in the space between the bottom of the coal loading wheel and the coke oven, which moves directly above the coal loading port during measurement and retracts from directly above the coal loading port during non-measurement. , The antenna is arranged facing the reflector. Since the reflector is located directly above the coal loading port during measurement, coal and the like are particularly likely to adhere to the reflector.

In this case as well, in the same manner as above, after the coal loading level measuring device is attached to the coal loading vehicle, before the first coal loading operation, transmission and reception are performed on a surface other than the coal charging port of the coke oven to perform transmission and reception, and the reference reception strength I Measure ₀ . At the time of measurement, the reflector is moved directly above the coal loading port to transmit and receive the detection wave, but the transmission and reception are performed under the same conditions as when the reference reception intensity I ₀ was measured for each coal loading operation or for each predetermined number of times. performed to measure the reception intensity I _m by. Then, when the reception intensity _Im is attenuated to a predetermined value or less from the reference reception intensity I _0, it is determined that it is time to clean the reflection surface of the reflector which is the propagation path.

As described above, the present invention is applicable to Sosumi level measuring device generally measured beforehand a reference reception intensity I _0, in the same conditions as when measuring the reference reception intensity I ₀ at any time Sosumi work measures the reception intensity I _m Te, only obtaining the attenuation amount from the reference reception intensity I _0, the cleaning timing of the propagation path of the detection wave can be accurately determined.

1 Coal charging wheel 10 Coal receiving hopper 11 Coal input chute 12 Coal feeding device 20 Transmission / reception device 22 Antenna 30 Dustproof / heatproof filter 35 Gas supply port 40, 40A Guide pipe 41 First reflector 42 Second reflector 50 Shutter 51 Ring 100 coke oven 101 rail 102 coal port C, C'coal

Claims (2)

It is attached to the coal loading wheel, transmits a detection wave into the furnace through the coal charging port of the coke oven, receives the detection wave reflected on the surface of the coal dropped from the coal loading wheel, and determines the coal loading level of the coal. It is a method of detecting the adhering state of the deposit to the propagation path of the detection wave in the coal loading level measuring device to be measured.
After installing the coal charge level measuring device and before the first coal charge operation, transmission and reception are performed on a surface other than the coal charge port of the coke oven to measure the reference reception strength I ₀ .
At any time Sosumi work, the reception intensity I _m and to transmit and receive at the same conditions when measuring the reference reception intensity I ₀ was measured, the reception intensity I _m than the reference reception intensity I ₀ A method for detecting an adhesion state of a coal loading level measuring device, which determines that it is time to clean the propagation path when it is attenuated to a predetermined value or less. It is attached to the coal loading wheel, transmits a detection wave into the furnace through the coal charging port of the coke oven, receives the detection wave reflected on the surface of the coal dropped from the coal loading wheel, and determines the coal loading level of the coal. It is a method of detecting the adhering state of the deposit to the propagation path of the detection wave in the coal loading level measuring device to be measured.
The propagation path includes the coal input chute of the coal loading vehicle, and also installs a reflector that blocks the inside of the coal input chute .
Prior to the first coal loading operation, the coal input chute is blocked with the reflector to transmit and receive, and the reference reception strength I ₀ is measured.
At any time Sosumi work, the reception intensity I _m and to transmit and receive at the same conditions when measuring the reference reception intensity I ₀ was measured, the reception intensity I _m than the reference reception intensity I ₀ A method for detecting an adhesion state of a coal loading level measuring device, which determines that it is time to clean the propagation path when it is attenuated to a predetermined value or less.

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