JPH0120199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention captures gas released into the atmosphere from a charging port when charging coal into a coke oven with a smoke collection hood installed on a coal charging vehicle, and collects dust. This invention relates to a method for preventing explosion of collected gas on a charging vehicle in so-called charging vehicle dust collection.

Normally, when charging coal into a coke oven, 1000
14t/20t at once in a carbonization chamber heated to ℃~1300℃
of coal is charged, the coal powder that comes into contact with the heating wall of the coking chamber is rapidly distilled to dryness, and a large amount of gas containing combustible materials is generated and released into the atmosphere from the coal charging port.

In order to capture and collect dust from the gas ejected from the charging port during coal charging, a dust collection hood that can be raised and lowered is installed on the charging vehicle. The gas ejected from the charging port is captured by the charging vehicle, which is then collected by a large dust collector installed on the ground via fixed ducts installed along the rows of coke ovens. Centralized dust collection is generally used.

By the way, as mentioned above, the gas ejected from the charging port during coal charging contains a large amount of combustible matter, so the charging car located above the coke oven, which is the fire source, In the above method, there is always a possibility that the trapped gas may explode, so to prevent this, the trapped gas is burned and then water is sprinkled.

However, even if such a method is adopted, when the combustion equipment and water spray equipment on the charging vehicle are operating normally, the collected gas may not be combusted in the combustion equipment or the water spray If a situation occurs where water is not supplied from the equipment, gas that still contains flammable substances may be leaked into the equipment on the charging vehicle, into the ducts connecting them, into fixed ducts, and into ground-mounted dust collectors. There is a potential danger that this untreated gas could explode on the charging vehicle, in fixed ducts, or in ground-mounted dust collectors.

The present invention was made to eliminate these conventional drawbacks, and detects abnormalities in equipment such as the combustion device, water sprinkler, French scrubber, etc. mounted on the charging vehicle, and responds accordingly to each abnormality. This system automatically causes the equipment mounted on the charging vehicle to perform appropriate safety operations.

First, a method for treating the collected gas on the charging vehicle will be explained with reference to FIGS. 1 and 2.

During coal charging from the charging car 23 to the coke oven carbonization chamber 24, gas ejected into the atmosphere from the charging port 2 is captured by the smoke collection hood 3 and is collected by the suction blower mounted on the charging car 23. The combustion chamber 1 is sucked by the suction force of the fan scrubber 17, which plays the role of
1, Pre Duster 13, Fan Scrubber 17,
After passing through the eliminator 19 and undergoing each of the treatments described below, the dust is introduced into a large dust collector (not shown) installed on the ground via a connecting duct 20 and a fixed duct 21 arranged around the furnace rows. is,
Dust is collected and released into the atmosphere.

Next, a method for treating the collected gas introduced into the equipment mounted on the above-mentioned charging vehicle 23 in each equipment will be described.

The gas introduced into the combustion chamber 11 is combusted with the help of a fire source provided by the combustion device 8, and is introduced into the next pre-duster 13 in a state where no combustible material is present. The combustion device 8 is configured to be supplied with fuel and combustion air from a fuel tank 10 and an air supply device 9, respectively, and an ignition member built into the combustion device 8 fires the fuel immediately before the start of charging. It is designed to be ignited. still,
As supplementary combustion air, there are air holes 25 on the bottom of the combustion chamber 11 and on the side of the suction duct, the amount of air can be adjusted.
is installed. The combustion device 8 is not limited to the above-mentioned fuel combustion method, but may also be a method of generating electric sparks or a method of generating heat from a heating wire.

The pre-duster 13 is a type of inertial dust collector equipped with a large number of baffle plates inside.
The gas led out from the fan scrubber 17 is cooled by water spraying from a water spray nozzle 16 constituting a water spray device, and is partially removed from dust before being introduced into the next fan scrubber 17 . The water sprinkling device is composed of a water sprinkling pump 14 and a water sprinkling nozzle 16, which will be explained separately below.

The fan scrubber 17 is a type of dust collector that also serves as a suction blower, and water is injected from water nozzles 16, 16' to rotating blades provided radially around a rotating shaft, and the pre-duster 1 passing through the water spray nozzles 16, 16'.
The gas from 3 is subjected to dust collection processing.

The gas led out from the fan scrubber 17 is
Next is the Eliminator 1, which is a type of centrifugal dust collector.
introduced in 9. The eliminator 19 is also sprayed with water from the water nozzles 16, 16', and the gas introduced into the eliminator 19 is charged after being subjected to the final dust removal process on the charging vehicle. The dust is introduced into a fixed duct 21 via a removable connecting duct 20 provided on the vehicle, and the final dust collection process is performed by a large ground-mounted dust collector provided at the end of the fixed duct 21. being done. In addition, water is supplied to the water spray nozzles 16, 16' from a water spray storage tank 15 provided on the charging vehicle via a water spray pump 14. , a water supply level switch 22 that detects its upper and lower limits.
is provided.

Next, a chronological operation procedure of each of the collected gas processing equipment mounted on the charging vehicle 24 will be explained when each of the collected gas processing equipment is operated normally.

The charging operation performed after the charging car 23 stops on a predetermined carbonization chamber 24 can be roughly divided into three steps: automatic lid removal process, automatic charging process, and automatic lid attaching process. If the driver on the charging vehicle 23 turns on the switch for automatic operation of each process, then the next operation will be started in response to the signal obtained from the start or end of a predetermined operation of each equipment. Each piece of equipment automatically performs a predetermined operation one after another under instructions from a control device (not shown) in which a program is incorporated to perform the following steps.

First, in the first process, the automatic lid removal process,
When the driver on the charging car 23 turns on a switch to proceed with the process, a signal from the switch is transmitted to a control device (not shown), and the control device receives the signal and starts charging coal. (This is not directly related to this application, so it will not be described.)
As well as transmitting a signal to lower the smoke collection hood 3 and advance the connecting duct 20, the smoke collecting hood 3 lowers and maintains the position covering the charging port 2, and the connecting duct 20 It moves forward from the charging vehicle 24 and maintains the state connected to the fixed duct 21. When the connecting duct 20 is completely connected to the fixed duct 21, a signal indicating this is transmitted to the control device, and the control device receives the signal and inserts the charge into the lid removing machine 5, which is a device for attaching and detaching the charging lid 1. A command to remove the lid is transmitted to the fan scrubber 17, and a command to start operation is further transmitted to the sprinkler pump 14. Upon receiving this, the lid removal machine 15 removes the charging lid 1, and The fan scrubber 17 and the watering pump 14 start operating and the watering nozzle 1
Water is sprinkled from 6 and 16', and the preliminary operation of the gas treatment equipment is completed.

Next, the automatic charging process, which is the second process, will be explained. Charging car 2 after confirming the completion of the first process above
The operator above 3 also checks the status of other working machines, such as an extruder (not shown), and turns on a switch to proceed with the second process. The signal from the switch is transmitted to the control device, and the control device that receives the signal controls the device provided on the charging car 23 for charging coal into the carbonization chamber 24, the charging hood 4,
A command is given to the seaper 6 to perform the charging operation.
Also, since a command is issued to the combustion device 8 to ignite or generate heat, the charging hood 4 and the sheeter 6 that receive this command operate in a predetermined order, and the combustion device 8 ignites or generates heat. , which generates heat and assists in the combustion of the gases captured in this process. Note that the fan scrubber 17 and the sprinkler pump 14 have already been operated in the previous process, and the collected gas is transferred to the combustion chamber 11.
After being combusted, it is introduced into the pre-duster 13 by the suction force of the fan scrubber 17, and led out to the eliminator 19 by the pumping force of the fan scrubber 17. The collected gas from which dust has been removed in this process is led out to the fixed duct 21 via the communication duct 20. When a predetermined amount of coal has been charged, the seaper 6 is closed and automatic charging is completed.

Next, the third step, the automatic lid attaching step, will be explained. Charging car 2 after confirming the completion of the second process above
After confirming that the extruder, which is another working machine, has finished leveling the charged coal, the operator above turns on the switch to proceed with the third step. The signal from the switch is passed through the control device to the charging hood 4.
Then, it is transmitted to the lid removal machine 5, so the charging hood 4 that receives this rises, and the lid removal machine 5 descends to fit the gripped charging lid 1 into the charging port 2. . When the loading of the charging lid 1 by the lid removal machine 5 is completed, a signal indicating this is simultaneously transmitted from the lid removal machine 5 to the control device, and from the control device to the smoke collection hood 3, combustion device 8, and fan scrubber 17. In response to this signal, the smoke collection hood 3 is raised, the combustion device 8 stops igniting or generating heat, and the fan scrubber 17 stops operating. Once the smoke collection hood 3 has been raised,
A signal indicating this is emitted from the smoke collection hood 3 to the control device, and the control device that receives the signal transmits the signal to the connecting duct 20. Upon receiving the signal, the connecting duct 20 connects with the fixed duct 21. is released, and then the operation of the sprinkler pump 14 is stopped.

The above is the charging vehicle 23 when operated normally.
This is the chronological order of operation of the entire cycle of charging operation and gas processing operation using the equipment mounted on the tower.

However, each equipment does not always operate normally, and especially when combustion by the combustion device 8 stops abnormally during coal charging, the water sprinkler pump 1
4 stops, the amount of water sprinkled in the sprinkler device becomes abnormally low due to no water for sprinkling in the water storage tank 15, the operation of the fan scrubber 17 stops abnormally, or the fan scrubber 17 stops operating due to a power outage. If the power supply to the entrance 23 stops abnormally,
Each gas processing equipment on the charging vehicle 23 is filled with untreated gas containing combustible components, and this untreated gas is drawn into the suction blower of the ground equipment, and this untreated gas is sent not only into the fixed duct 21 but also to the equipment installed on the ground. Since the dust will also move inside the large dust collector, it will not be stored on the charging vehicle 23 or in the fixed duct 21.
Moreover, there is a possibility that the untreated gas could explode inside a large dust collector installed on the ground.

The basic technical idea of the present invention is that when each of the above abnormal situations occurs, it is transmitted to the control device installed on the charging vehicle 23, and the control device that receives this signal controls the charging vehicle 23. In addition to urgently filling the gas flow path of the dust collection equipment on 23 with inert gas, each device on 23 on the charging vehicle, namely the seaper 6 and the connecting duct 2
0, charging hood 4, lid removal machine 5, smoke collection hood 3,
An abnormality recovery operation is performed for the purpose of stopping the charging of coal into the carbonization chamber 24, blocking gas ejection from the charging hole 2, and releasing the connection between the charging vehicle 23 and the ground dust collection equipment. It is characterized by what it did.

Here, the abnormality recovery operation will be explained.

The sealer 6 operates to close, and the connecting duct 20 operates to disconnect from the fixed duct 21. When the seaper 6 is completely closed, the coal carbonization chamber 25
When the charging stops and the seaper 6 is completely closed, the charging hood 3 starts to rise and when the rising is completed, the capping machine 5 descends to a fixed position. At this point, the charging lid 1 held by the lid removing machine 5 is removed from the charging port 2.
The gas generation from the charging port 2 is blocked. Next, the charging lid 1 is separated from the lid removal machine 5, and the lid removal machine 5 is raised and stopped at a fixed position. Next, the smoke collection hood 3 rises and stops at a fixed position, completing the abnormality recovery operation.

The signal for performing the above abnormality return operation is referred to as an abnormality return operation command, and the signal indicating that the abnormality return operation is completed is referred to as an abnormality return operation completion signal, and each abnormal situation will be explained using these terms below.

A case will be described in which the combustion by the combustion device 8 abnormally stops during coal charging (that is, while the second step is in progress).

A signal indicating abnormal combustion stop is transmitted to the control device, which issues an abnormality recovery operation command. At the same time, the fan scrubber 17 stops. In this case, the sprinkler pump 14 continues to operate during the abnormality recovery operation, but preferably stops in response to a command from the control device that receives the abnormality recovery operation completion signal. As a result, the suction of gas from the charging port 2 is eliminated, and water sprinkling from the water spray nozzles 16, 16' is continued, so that an explosion caused by the gas remaining on the charging vehicle 23 is suppressed. Incidentally, if the combustion device 8 is of a fuel combustion type, abnormal combustion stoppage in the combustion device 8 may be detected by detecting that there is no fuel in the fuel tank 10, or by detecting the stoppage of the air supply blower 9. good. Alternatively, the detection may be performed using a thermocouple or a flame detection device provided at an appropriate position in the combustion device 8.

Next, a case where the operation of the watering pump 14 stops will be described as an example of a case where the amount of watering in the watering device abnormally decreases during automatic coal charging.

A signal indicating that the sprinkler pump 14 has stopped operating is transmitted to the control device. Note that the signal to stop the operation of the sprinkler pump 14 can usually be obtained from an interruption in the power supply to the sprinkler pump 14, as well as from the fact that the water storage tank 15 is empty and the overload protection relay operation of the sprinkler pump 14. You can also get it from Upon receiving this signal to stop the sprinkler pump operation, the control device immediately issues an abnormality recovery operation command to the charging hood 4, sheeper 6, smoke collection hood 3, cap remover 5, connection duct 20, and fan scrubber 17. The charging hood 4, the seaper 6, the smoke collecting hood 3, the cap remover 5, and the connecting duct 20 that have received this abnormality return operation command perform the abnormality return operation, and the fan scrubber 17 is stopped by the command from the control device. In this case, the combustion device 8 preferably continues its operation. Upon receiving the abnormality return operation command, the inert gas dispersion device 18 activates the inert gas dispersion nozzle 1.
Spray inert gas from 2, 12'. Note that this dispersion and ignition of the combustion device 8 are stopped at the same time as the abnormality recovery operation is completed. Explosion caused by residual gas on the charging vehicle 23 after the water pump stops operating is suppressed by dispersing this inert gas.

Next, a case will be described in which the operation of the fan scrubber 17 abnormally stops during coal charging.

The deactivation of the fan scrubber 17 is detected from the interruption of the power supply to the fan scrubber 17 or the operation of the overload protection relay of the fan scrubber 17, and the resulting signal is transmitted to the control device. Upon receiving the signal, the control device immediately issues the above abnormality return operation command, and the charging hood 4, sheeper 6, lid remover 5, connection duct 20, and smoke collection hood 3 perform the abnormality return operation. The operation of the combustion device 8 and the sprinkler pump 14 is stopped by this abnormal recovery operation completion signal. Even after the fan scrubber 17 has stopped, the combustion device 8 and the water sprinkler pump 14 continue to operate until the abnormality recovery operation is completed, so the gas remaining on the charging vehicle is combusted, cooled with water spray, and exploded. is suppressed.

Next, an explanation will be given of emergency measures to be taken when the power supply to the charging vehicle 23 is abnormally stopped, that is, in the case of a power outage.

In this case, since power is not supplied to the charging vehicle 23, it is impossible to perform abnormality recovery operations and inert gas dispersion of each equipment as it is. Therefore, a storage battery and a pressure accumulator are always mounted on the charging vehicle 23, and in the event of a power outage, a signal informing the power outage is transmitted to the control device, and upon receiving this signal, the control device switches the power source to the storage battery. Charging vehicle 2 during power outage because it performs recovery operation and inert gas spraying.
3 gas explosion can be suppressed. The inert gas is sprayed in the embodiments described in the case of an abnormal stop of the water sprinkler pump and the case of a power outage, but it is also sprayed in other abnormal cases.

Since the present invention is made as described above, the above-mentioned unexpected accident occurs during charging of coal from the charging car to the carbonization chamber, and the collected gas processing equipment on the charging car does not operate normally. Even in the event of an abnormality, the optimal safe operation is immediately implemented depending on the abnormality recovery operation and the failure of each equipment, making it possible to avoid explosion accidents caused by untreated gas on the charging vehicle, making it extremely safe and extremely safe. This is a useful invention.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view showing the arrangement of equipment related to charging car dust collection mounted on a charging car;
The figure is a detailed view of the part. 1... Charging lid, 2... Charging port, 3... Smoke collection hood, 4... Charging hood, 5... Cap removing machine, 6... Seaper, 7... Suction duct, 8... Combustion device , 9
...Air supply blower, 10...Fuel tank, 1
1... Combustion device, 12, 12'... Inert gas distribution nozzle, 13... Pre duster, 14... Watering pump, 15... Watering storage tank, 16, 16'
...Water nozzle, 17...Fan scrubber, 1
8...Inert gas distribution device, 19...Eliminator, 20...Connection duct, 21...Fixed duct, 22...Water supply level switch, 23...Charging vehicle, 24...Carbonization chamber, 25...Air Hole.

Claims (1)

[Claims] 1. Lowering the smoke collection hood and the charging hood provided therein, and removing the charging lid of the charging port;
The seaper in the charging hood is opened and coal is charged into the carbonization chamber, and the gas ejected from the charging port is captured by the smoke collection hood, and then a combustion device, a water sprinkler,
After combustion, it is cooled in the dust collection equipment on the charging vehicle, which mainly consists of a fan scrubber and a connecting duct, and then the obtained cooled waste gas is passed through the connecting duct and a fixed duct placed at the top of the furnace. In the coke oven charging car dust collection, which is connected to the fixed duct and introduced into a ground-mounted large dust collector equipped with a suction blower, if the combustion by the combustion device abnormally stops or the water spray If the amount of water sprinkled inside the device decreases abnormally,
In response to commands issued by the control device that receives these abnormality signals, the gas flow path of the dust collection equipment on the charging vehicle is urgently filled with inert gas, and the following (1) to (4) are carried out. In addition, if a signal is received indicating that the combustion has stopped abnormally, the sprinkler system will continue to operate, and if a signal that the amount of water sprinkled has decreased abnormally is received, the combustion device will continue to operate. A method for preventing explosions in dust collection from coke oven charging cars, characterized by: (1) Closing the seaper and separating the connecting duct and fixed duct. (2) Elevation of said charging hood. (3) Fitting the charging lid into the charging port. (4) Elevation of said smoke collection hood.