JP6932368B2 - Coal charge level measuring device - Google Patents

Description

The present invention relates to high-temperature objects such as coal in a coke oven, iron ore and coke in a blast furnace, steel slag, molten iron in a molten iron pot, combustible waste in an incinerator, and slabs from a casting machine, in the furnace or in a container. It relates to a device for detecting a surface condition such as a level, a surface profile, and a surface warp.

For example, in a coke oven, a coal loading vehicle is moved to the coal charging port, and coal from the coal input chute of the coal charging vehicle is dropped into the furnace through the coal charging port for operation. In order to raise the coal charge level, the coal charge level in the furnace is measured. In the blast furnace, iron ore and coke are alternately charged into the furnace for operation, but in order to optimize the deposition state of iron ore and coke, the deposition state of the introduced iron ore and coke. Is detected and reflected in the charging operation.

As a device for detecting the level of coal charged into the coke oven and the surface profile of iron ore and coke charged into the blast furnace, the applicant has previously used the detection devices shown in Patent Documents 1 to 3. is suggesting.

Patent Document 1 relates to an apparatus for measuring a coal charge level in a coke oven. However, to explain with reference to FIGS. 1 and 3, one end of a guide pipe 40 (40A) is attached to a coal input chute 11 of a coal charge vehicle 1. The detection wave from the transmission / reception device 20 is transmitted from the antenna 22 installed at the other end of the guide pipe 40 (40A), and sent into the furnace through the coal input chute 11 and the coal charging port 102 of the coke oven 100. The coal charge level is measured by receiving the detection wave reflected on the surface of coal C'in the furnace.

Further, Patent Document 2 also relates to an apparatus for measuring the coal charge level, but to explain with reference to FIG. 4, the reflector 23 is moved directly above the coal charge port 102 at the time of measurement and faces the reflector 23. The detection wave is transmitted from the arranged antenna 22, reflected by the reflection surface 23a of the reflector 23, and the detection wave is sent into the furnace through the coal loading port 102.

Patent Document 3 relates to an apparatus for detecting the surface profile of iron ore or coke in a blast furnace. However, to explain with reference to FIG. 5, a reflector 60 is installed directly above the opening 102'of the blast furnace 100'. The detection wave from the antennas 22 arranged opposite to each other is reflected and sent into the furnace through the opening 102', and the detection wave reflected by iron ore or coke (charge Q) is received. At that time, the shaft 61 is attached to the center of the back surface (the surface opposite to the antenna 22) of the reflector 60, and the motor 62 rotates the shaft 61 around the axis of the shaft 61 in the X direction in the drawing to reflect the reflection. The plate 60 is configured to linearly scan the charge Q by changing the reflection angle in the front-rear direction of the paper surface to obtain a linear surface profile.

As described above, all the detection devices are installed in the vicinity of the openings 102 and 102'of the furnaces 100 and 100', and the detection waves from the transmission / reception device 20 are transmitted from the antenna 22 to the guide pipe 40 (40A) and the like. Using the reflectors 23 and 60, the detection wave is guided into the furnace through the openings 102 and 102', and the detection wave reflected on the surface of the charge (coal C', iron ore and coke Q) in the furnace is transmitted and received by the transmitter / receiver 20. It is configured to receive with.

Japanese Unexamined Patent Publication No. 2015-172184 Japanese Unexamined Patent Publication No. 2012-188589 Japanese Unexamined Patent Publication No. 2015-219129

The transmission / reception device 20 of the detection device is provided with various electronic devices such as a transmitter / receiver of a detection wave, amplifiers, and a transmission / reception circuit, and heat from the furnace wall of the coke oven 100 or the blast furnace 100'and coal loading. It is desired to dispose of it away from the antenna 22 in order to thermally protect it from the high heat from the mouth 102 and the opening 102'.

In addition, microwaves and millimeter waves are used as detection waves because they have little effect on suspended matter and gas in the furnace, high temperature in the furnace, etc., and because of their high directivity, even microwaves have high frequencies. Is becoming more popular, and millimeter waves are particularly preferred. However, if the transmission / reception device 20 is arranged away from the antenna 22 for the above reason, the waveguide or coaxial cable connecting the transmission / reception device 20 and the antenna 22 becomes long, and the attenuation becomes particularly large in millimeter waves. Also, microwaves are more likely to be attenuated as the frequency increases.

Also, for steel slag, molten iron in molten iron pots, combustible waste in incinerators, slabs from casting machines, etc., antennas are placed above these high-temperature objects, and detection waves from the transmitter / receiver are directed toward the surface of the high-temperature objects. Is transmitted from the antenna, and the detection wave reflected on the surface of the high temperature object is received by the transmitter / receiver through the antenna to measure the surface condition such as the level and warpage of the high temperature object, which has the same problem. ing.

Therefore, according to the present invention, in a device for measuring the coal charge level of coal in a coke oven, microwaves and millimeter waves, especially millimeter waves, are less attenuated even when the transmitter / receiver and the antenna are separated for thermal protection. The purpose is to perform stable transmission and reception and accurately measure the coal charge level.

In order to solve the above problems, the present invention provides the following coal loading level measuring device.
(1) coal feed device from受炭hopper Sotansha sent to the coal chute, toward the surface of the coal supplied to the coke oven through the coal chute, a millimeter-wave from the transceiver from an antenna transmitted, a device for measuring the Sosumi levels received by the coal you re wave before being reflected by the surface of the coal by the transceiver device,
A multiplying mixing member including a multiplier and a mixer is separated from the members constituting the transmission / reception device, and the multiplying mixing member is installed inside the coal loading wheel.
In addition, the transmission / reception device from which the multiplication mixing member is separated is installed in a room temperature portion outside the coal loading vehicle, and then the transmission / reception device is installed.
The transmitter / receiver is arranged away from the antenna, and the transmitter / receiver and the multiplier in the multiplier mixing member are connected by a waveguide or a coaxial cable.
A coal loading level measuring device, characterized in that the multiplying mixing member is directly connected to the antenna inside the coal loading wheel.
(2) provided with a guide pipe for propagating before you re wave from said antenna,
The coal loading level measuring device according to (1) above, wherein one end of the guide pipe is connected to an opening on the upper surface of the coal input chute, and the antenna is housed in the other end of the guide pipe.
(3) The coal loading level measuring device according to (1) or (2) above, wherein the multiplying mixing member is cooled.

In the coal loading level measuring device of the present invention, the multiplier and the mixer are separated from the constituent members of the transmitter / receiver and connected to the antenna, and the transmitter / receiver excluding the multiplier and the mixer is connected to the normal temperature portion outside the coal loading vehicle. The transmitter / receiver can be thermally protected by installing it in a device, locating it away from the antenna, and connecting it to the multiplier with a waveguide or coaxial cable. At the same time, the frequency is low, and the waveguide and coaxial cable are dedicated to transmission or reception, and even if they are lengthened, the detection wave is less attenuated, so stable transmission and reception are possible. Waves can be used, increasing measurement accuracy. Moreover, since the multiplier and the mixer do not have an adjustment unit, there is no problem in adjustment or maintenance even if they are separated.

It is a figure which shows the example which applied this invention to the coal-loading level measuring apparatus. FIG. 1 is a diagram for explaining a cooling method of the multiplier. It is sectional drawing which shows the other example of the coal charge level measuring apparatus. It is sectional drawing which shows still another example of the coal charge level measuring apparatus. It is a figure which shows the example which applied this invention to the surface profile detection apparatus of the charge in a blast furnace.

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

As an example of the surface detection device for a high temperature object, for example, a coal charge level measuring device for measuring the coal charge level in a coke oven can be mentioned. FIG. 1 is an example in which the present invention is applied to the coal loading level measuring device of Patent Document 1. Here, only the main part will be described, and Patent Document 1 can be referred to for details.

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 charging 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 charging chute 11 by the coal feeding device 12, and enters the furnace through the sleeve 13. Drop it.

The coal charge level measuring device includes a detection wave transmission / reception device 20, an antenna 22, a guide pipe 40, and a multiplication / mixing member 50 including a multiplier and a mixer separated from the transmission / reception device 20. The guide pipe 40 is a straight pipe, one end of which is connected to the opening 11b of the upper surface 11a of the coal input chute 11, and the other end of which houses the antenna 22. Further, since coal C', dust, and gases from the inside of the furnace enter the guide pipe 40 through the coal loading wheel 102 and the coal input chute 11, the purging gas is supplied from the gas supply port 35.

The transmitter / receiver 20 usually includes a transmitter, a multiplier that increases the frequency of a signal from the transmitter by an integral multiple, and a mixer that is connected to the multiplier, and the mixer is connected to an antenna. Then, the detection wave (transmission wave) obtained by multiplying the signal from the transmitter is transmitted from the antenna, the detection wave received by the antenna is input to the mixer, and the frequency difference (FMCW method) or time difference from the transmission wave is performed by the arithmetic circuit. The distance to the object is measured based on (pulse method). Further, the transmission / reception device 20 includes a control circuit and the like for controlling the transmission / reception of the detection wave. The detection wave is a microwave or millimeter wave, and the signal from the transmitter is set to the frequency of the microwave band, for example, a microwave of 13 to 13.5 GHz is generated, and this is multiplied by 6 to be 78 to 81 GHz. Generates millimeter waves.

In the present invention, the multiplier and the mixer are separated from the transmitter / receiver 20. Then, the transmission / reception device 20 excluding the multiplier and the mixer is arranged in the room temperature part (upper in the example of the figure) of the coal loading wheel 1, and is composed of the transmission / reception device 20 from which the multiplier and the mixer are removed, and the multiplier and the mixer. The multiplying mixing member 50 is connected by a waveguide or a coaxial cable 51. Since the waveguide or coaxial cable 51 is dedicated to transmission or reception and has a low frequency band, the attenuation of microwaves and millimeter waves is small at the longest.

Further, the multiplying mixing member 50 is installed in the vicinity of the antenna 22, and both are connected by a coaxial cable or the like. Alternatively, the multiplying mixing member 50 and the antenna 22 may be directly connected.

In the coal loading level measuring device configured as described above, after dropping the coal C, as shown by reference numeral R in the figure, the signal from the transmission / reception device 20 is multiplied by the multiplying mixing member 50, and the guide pipe 40 is connected to the antenna 22. And propagated through the guide pipe 40 and sent into the furnace through the coal input chute 11, and the microwave reflected on the surface of the accumulated coal C'is transmitted through the multiplying mixing member 50, the waveguide or the coaxial cable 51. Received by the transmitter / receiver 20 to detect the deposition level of coal C'. At that time, at the time of measurement, the high-temperature heat in the furnace is transferred upward from the coal charging port 102 through the coal input chute 11 and the guide pipe 40, and further upward from the furnace wall on the upper surface of the coke oven 100. According to the present invention, since the transmission / reception device 20 from which the multiplier and the mixer are removed is arranged away from the high temperature portion of the coal loading wheel 1, it is protected from these heats and stable detection wave transmission / reception can be performed.

Further, since the multiplier and the mixer have no members affected by high temperature and can withstand a certain temperature, they can be installed in the vicinity of the antenna 22, but for example, the heat countermeasure shown in FIG. 2 can be taken. As shown, the multiplying mixing member 50 is surrounded by the container 52, the waveguide or the coaxial cable 51 is inserted into the protective tube 56, the container 52 and the protective tube 56 are connected, and the protective tube 56 is used for cooling. Supply gas (air, nitrogen gas, etc.) and distribute it inside. Alternatively, the container 52 accommodating the multiplying mixing member 50 may be omitted, and the protective tube 56 may be directly connected to each case accommodating the multiplier or the mixer, and the cooling gas may be circulated in the case.

FIG. 3 shows an example in which the present invention is applied to another coal loading level measuring device of Patent Document 1. Here, only the main part will be described, and Patent Document 1 can be referred to for details.

As shown in FIGS. 1 and 2, the vertical guide pipe 40 cannot be connected to the upper 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. Therefore, as shown in the figure, a guide pipe 40A made of an L-shaped pipe is used. 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 40c 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. Then, the hanging portion 40c of the guide pipe 40A is connected to the upper surface 11a of the coal input chute 11 via the filter 30, and the antenna 22 is housed in the straight pipe portion 40a, and the signal from the transmission / reception device 20 is multiplied. Microwaves and millimeter waves multiplied by the mixing member 50 and transmitted from the antenna 22 propagate through the straight pipe portion 40a and are reflected by the first reflecting plate 41 as shown by R in the figure, and are reflected by the first reflecting plate 41 and are reflected by the horizontal portion 40b. After being further reflected by the second reflecting plate 42, it propagates through the hanging 40c and proceeds to the coal input chute 11.

By using this guide pipe 40A, it is possible to obtain the effect of separating the transmission / reception device 20 from the coal charging port 102 to protect it from heat, but by applying the present invention, further heat protection can be achieved.

FIG. 4 is a diagram showing an example in which the present invention is applied to the coal loading level measuring device of Patent Document 2. Here, only the main part will be described, and Patent Document 2 can be referred to for details.

In the space between the bottom surface of the coal loading wheel 1 and the coke oven 100, a reflector 23 is provided that moves directly above the coal charging port 102 during measurement and retracts from directly above the coal charging port 102 during non-measurement. The antenna 22 is arranged so as to face the plate 23. Further, a guide pipe 26 extending to the reflector side is attached to the antenna 22 to protect the antenna 22 from heat from the coal charging port 102. Then, the multiplier and the mixer are separated from the transmitter / receiver 20, connected by a waveguide or a coaxial cable 51, and the multiplier mixing member 50 is connected to the antenna 22. In this coal loading level measuring device, at the time of measurement, the reflector 23 is moved directly above the coal loading port 102, and as shown by R in the figure, the signal from the transmitting / receiving means 20 is multiplied by the multiplying mixing member 50. Microwaves and millimeter waves are transmitted from the antenna 22, reflected by the reflecting surface 23a of the reflector 23, and sent into the furnace through the coal loading port 102.

Even in this coal loading level measuring device, the transmission / reception device 20 from which the multiplier and the mixer are removed is not affected by the heat from the coke oven 100.

Further, FIG. 5 shows the surface profile detection of the charged material for measuring the surface profile of iron ore or coke (hereinafter referred to as “charged material Q”) charged in the blast furnace 100'instead of the coke oven 100 as described above. It is a figure which shows the example applied to the apparatus. This surface profile detecting device shows an example in which the present invention is applied to the surface profile detecting device of Patent Document 3, and here, only the main part is described and Patent Document 3 can be referred to for details.

In the illustrated surface profile detecting device, the reflector 60 is arranged directly above the opening 102'of the blast furnace 100', and the antenna 22 is arranged so as to face the reflecting surface of the reflector 60. A shaft 61 is attached to the center of the back surface of the reflector 60 (the surface opposite to the antenna 22), and the motor 62 rotates the shaft 61 in the X direction around the axis of the shaft 61. Further, a frame member 27 is attached to the peripheral edge of the opening of the antenna 22, and the frame member 27 has a breathable filter 28 made of a heat-resistant material that transmits microwaves and millimeter waves, and a non-ventilated filter 28 made of the same material. A property partition 29 is attached, nitrogen gas is supplied between the filter 28 and the partition 29 and ejected from the filter 28 toward the reflector 60 to prevent dust from adhering to the filter 28 and the reflector 60. There is. Also in this surface profile detection device, the multiplier and the mixer are separated from the transmitter / receiver 20, arranged apart from the antenna 22 and connected by a waveguide or a coaxial cable 51, and the multiplier mixing member 50 is connected to the antenna 22. Connect to.

The signal from the transmitting / receiving means 20 is multiplied by the multiplying mixing member 50, and the microwaves and millimeter waves transmitted from the antenna 22 are reflected by the reflector 60 and inside the furnace through the opening 102'as shown by R in the figure. Will be sent to. Then, the reflected wave reflected on the surface of the charge Q in the furnace reaches the reflector 60 through the opening 102', is incident, and is sent to the transmitting / receiving means 20. At that time, by rotating the reflector 60 with the motor 62 to change the reflection angle, microwaves and millimeter waves can be oscillated in the front-rear direction of the paper surface, and the surface of the charge Q can be scanned linearly. .. This makes it possible to obtain a linear surface profile of the charge Q in the furnace.

Although not shown, the surface of the charge Q is further changed by changing the angle of inclination of the reflector 60 toward the antenna 22 as described in International Publication No. 2015/133005 by the applicant. Can be scanned in a planar manner, and a planar surface profile can also be obtained.

As a surface detection device for high-temperature objects, the present invention is also applied to a detection device for measuring the level and surface condition of steel slag, molten iron in a molten iron pot, combustible waste in an incinerator, slabs from a foundry, etc. Similarly, by separating the multiplier and the mixer from the transmitter / receiver, the transmitter / receiver can be installed away from a high temperature location to be thermally protected, and stable transmission / reception can be performed.

Although the present invention is useful for measuring high-temperature objects, the multiplier mixing member 50 is arranged together with the antenna 22 in other dangerous places where gas is present, and the multiplier and the mixer are separated. The transmission / reception device 20 can be arranged in another safe place.

1 Blast furnace 10 Coal receiving hopper 11 Coal input chute 12 Coal feeding device 20 Transmission / reception device 22 Antennas 23, 60 Reflecting plates 40, 40A Guide pipe 41 First reflecting plate 42 Second reflecting plate 50 Multiplying mixing member 51 Waveguide Or coaxial cable 100 coke furnace 100'blast furnace 101 rail 102 coal inlet 102' opening C, C'coal Q charge (iron ore or coke)

Claims (3)

Is sent to the coal chute by coal feed device from受炭hopper Sotansha, toward the surface of the coal supplied to the coke oven through the coal chute, transmits a millimeter-wave from the transceiver from an antenna, an apparatus for measuring the Sosumi level of the received coal you re wave before being reflected by the surface of the coal by the transceiver device,
A multiplying mixing member including a multiplier and a mixer is separated from the members constituting the transmission / reception device, and the multiplying mixing member is installed inside the coal loading wheel.
In addition, the transmission / reception device from which the multiplication mixing member is separated is installed in a room temperature portion outside the coal loading vehicle, and then the transmission / reception device is installed.
The transmitter / receiver is arranged away from the antenna, and the transmitter / receiver and the multiplier in the multiplier mixing member are connected by a waveguide or a coaxial cable.
A coal loading level measuring device, characterized in that the multiplying mixing member is directly connected to the antenna inside the coal loading wheel. Provided with a guide pipe for propagating before you re wave from said antenna,
The coal loading level measuring device according to claim 1, wherein one end of the guide pipe is connected to an opening on the upper surface of the coal input chute, and the antenna is housed in the other end of the guide pipe. The coal loading level measuring apparatus according to claim 1 or 2, wherein the multiplying mixing member is cooled.

Images