JP4890231B2 - Start-up method of high-temperature coal treatment facility - Google Patents

Description

The present invention relates to a method for starting up a processing facility for heating coal to a high temperature and transporting it to a coke oven.

Conventionally, there is equipment for drying coal, but since the coal temperature at the time of drying is less than 100 ° C., there is no need to consider the problem of quality degradation due to oxidation of coal. For this reason, coal has been transported using an open-air transport facility using a belt conveyor.
On the other hand, regarding the production of coke, in order to improve its production efficiency, heated coal (for example, 100 ° C. or higher) in a heated state (hereinafter also referred to as “high temperature coal”) is charged into a coke oven carbonization chamber, and coke is produced. A method of manufacturing is considered.

However, when treating coal in a high-temperature state before charging a coke oven with the above-mentioned conventional open-air transportation equipment, the coal deteriorates and dry distillation because the high-temperature coal reacts with oxygen in the atmosphere to cause oxidation. There are problems that adversely affect later coke quality.
Therefore, there is a method for reducing the oxygen concentration inside the processing equipment by flowing an inert gas to the processing equipment connected with a plurality of processing devices for processing coal, respectively, by a conveyance path, and processing high-temperature coal without contacting with the atmosphere. It has been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent Publication No. 63-41959 Japanese Patent Publication No. 63-18637

However, when starting up the processing equipment, if this processing equipment is equipped with a plurality of coal processing equipment, it is important to determine the order of operation start of each processing equipment, if this order is not appropriate, The time to start operation of the coke oven must be delayed until all processing equipment is operational. For this reason, for example, even if there is a processing apparatus that can operate and supply coal to the coke oven, the processing apparatus must wait until another processing apparatus is ready for operation, There is a problem that efficiency decreases.

The present invention has been made in view of such circumstances, and at the start-up of a processing facility for conveying coke to a coke oven while keeping the coal in a high temperature state, the start-up of the processing facility for high-temperature coal capable of increasing coke production efficiency. It aims to provide a method.

The present invention is for solving the above-mentioned problems, and means (1) is a method for starting up processing equipment for heating and drying coal for metallurgical coke and transporting it to a coke oven in a high temperature state. Because
The processing equipment is
Dry classification means for drying the coal and classifying the coal into powder and coarse particles, pulverized coal forming means for converting the powder obtained by the dry classification means into a formed coal by a molding machine, the drying Coarse coal heating means provided with an airflow heating tower for heat-treating the coarse particles obtained by the classification means with hot air, and the coarse particles treated by the coarse coal heating means and the pulverized coal molding means High temperature coal transport means for transporting and storing the formed coal formed in step 1 to a coal storage tank disposed on the upstream side of the coke oven, and a transport path connecting the means.
When starting the transport of the coal, after starting the operation of the high-temperature coal transport means, start the operation of the pulverized coal forming means and the coarse coal heating means simultaneously or one of the operations first, Further, thereafter, the operation of the dry classification means is started.

Means (2) is a method for starting up a treatment facility for heating and drying coal for metallurgical coke and transporting it to a coke oven in a high temperature state,
The processing equipment is
Dry classification means for drying the coal and classifying the coal into powder and coarse particles, pulverized coal forming means for converting the powder obtained by the dry classification means into a formed coal by a molding machine, the drying Coarse coal heating means provided with an airflow heating tower for heat-treating the coarse particles obtained by the classification means with hot air, and the coarse particles treated by the coarse coal heating means and the pulverized coal molding means High-temperature charcoal transport means for transporting and storing the coking coal formed in the above to a coal storage tank disposed on the upstream side of the coke oven;
A conveying path for connecting the respective means, and a bypass conveying path for bypassing the air flow heating tower of the coarse coal heating means and connecting the dry classification means and the high temperature charcoal conveying means,
When the coal is started to be transported, the operations of the respective units are sequentially started in the order of the high-temperature coal transport unit, the pulverized coal forming unit, the dry classification unit, and the coarse coal heating unit.

In the means (3), in the means (1) and means (2), the temperature of the coal in a high temperature state is 100 ° C. or more and 300 ° C. or less, and the processing device of each means and each conveyance path are respectively casings. Covered.
Here, the processing device being covered with the casing means that the processing device only needs to be in a sealed state (excluding the coal supply port and the discharge port), and the processing device itself has a casing. If the processing apparatus is open to the atmosphere, the casing is covered with a casing and sealed.

The method for starting up a high-temperature coal treatment facility according to the present invention divides the treatment facility into a plurality of means, and determines the operation start time of each means so that the treatment devices of all the means can be operated. Until then, coal can be supplied to the coke oven without delaying the start of operation of the coke oven. Thereby, coke production efficiency can be increased.
In addition, for example, means equipped with a processing device capable of transporting coal to the coke oven does not need to wait until the processing device of other means is ready to operate, thus increasing the operating rate of the processing device. Can do.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory diagram of a processing facility to which a method for starting up a high-temperature coal processing facility according to an embodiment of the present invention is applied.

As shown in FIG. 1, the method for starting up a high-temperature coal treatment facility according to an embodiment of the present invention is to heat and dry coal for metallurgical coke and convey it to a coke oven 10 in a high-temperature state. The processing equipment 11 is started up by dividing the processing equipment 11 into a plurality of means and starting up each means in the order shown below.
First, after explaining the processing equipment 11 using the starting method of the processing facility of the high temperature coal which concerns on one embodiment of this invention, the starting method of the processing equipment of the high temperature coal is demonstrated.

The processing equipment 11 has means each including one or more processing devices, that is, a dry classification means, a pulverized coal forming means, a coarse coal heating means, a high temperature coal conveying means, and a conveying path connecting the respective means. is doing. And the process of the dry classification process A, the pulverized coal shaping | molding process B, the coarse coal heating process C, and the high temperature coal conveyance process D is performed for every block provided with these each means.
By this processing equipment 11, coal containing pulverized coal (for example, a particle size of 0.5 mm or less) made of powder and coarse coal (for example, a particle size of more than 0.5 mm) made of coarse particles. A predetermined amount is cut out from a piled yard (not shown), dried, and conveyed to the coke oven 10 in a high temperature state.
In this embodiment, the case where the processing facility is configured with four means and a conveyance path connecting each means is described, but the present invention is not limited to this, and five or more means are connected to these. You may make it have a conveyance path.

The dry classification means for performing the process of the dry classification step A includes a fluidized bed dryer 12 to which coal that is piled up in a yard and attached with moisture is supplied, and a collector 13 that collects the classified pulverized coal. Yes.
This fluidized bed dryer 12 blows hot air from below and dries while heating coal. Here, the pulverized coal (temperature: about 165 ° C.) adhering to the periphery of the coarse coal is blown upward, collected by the collector 13 through the pipe, and conveyed to the pulverized coal molding process B on the downstream side. . On the other hand, the coarse coal (temperature: about 350 ° C.) is dropped and recovered and conveyed to the coarse coal heating step C. The gas sucked into the collector 13 is released to the atmosphere.

The pulverized coal molding means for performing the process of the pulverized coal molding process B includes a molding machine 14 that molds a kneaded material in which a binder is mixed with pulverized coal, and a vibrating sieve 15 that screens the molded product. In addition, on the upstream side of the molding machine 14, a conveyor 16 that transports the pulverized coal collected by the collector 13 in the drying classification process A, and a bucket conveyor that supplies the pulverized coal transported by the conveyor 16 to the molding machine 14. 17 is provided. Further, on the downstream side of the vibration sieve 15, a conveyor 18 for conveying the coal powder below the vibration sieve 15 to the bucket conveyor 17 again is disposed.

The molding machine 14 includes a hopper that supplies the kneaded material downward, and a pair of rolls that rotate oppositely to each other so as to pressurize the kneaded material and can be molded into a thin plate shape, for example.
The vibrating sieve 15 is a device for sieving the charcoal on the sieve formed by the molding machine 14 and the pulverized coal under the sieve that has not been formed or has been formed but has collapsed.
The charcoal on the sieve of the vibrating sieve 15 is conveyed to the high-temperature charcoal conveying step D, while the pulverized coal is conveyed to the bucket conveyor 17 and is again applied to the molding machine 14 and molded.
In addition, when coal to convey is high temperature, the molding machine 14, the vibration sieve 15, each conveyor 16,18, and the bucket conveyor 17 are each covered with a casing, and it suppresses that the coal conveyed is in direct contact with external air. Further prevent.

The coarse coal heating means for performing the treatment of the coarse coal heating step C includes an air flow heating tower 19 for heating the coarse coal to a high temperature state (for example, in a range of 350 ° C. or lower) in the process of conveying the coarse coal with hot air, And a dust collector 20 that separates the hot air flowing in from the airflow heating tower 19 and collects coarse coal.
In addition, on the upstream side of the airflow heating tower 19, a bucket conveyor 21 that raises the coarse coal classified by the fluidized bed dryer 12 in the drying classification process A to a target height position, and the bucket conveyor 21 conveys it. A conveyor 22 is provided for transporting the coarse coal to the airflow heating tower 19.
In addition, the conveyor 22 and the bucket conveyor 21 are each covered with the casing, and the coal conveyed is suppressed and further prevented from coming into direct contact with the outside air.

The high-temperature coal conveyance means for performing the treatment of the high-temperature coal conveyance step D is a coal in a high temperature state (coal) including the formed coal obtained in the pulverized coal molding step B and the coarse coal obtained in the coarse coal heating step C. A coal storage tank 23 that stores a temperature at which the quality of the fuel can be maintained, that is, 100 ° C. or more and 300 ° C. or less, preferably 200 ° C. or more and 300 ° C. or less. After supplying a predetermined amount, the charcoal is charged into the carbonization chamber of the coke oven 10.
On the upstream side of the coal storage tank 23, the formed coal obtained in the pulverized coal forming step B and the coarse coal heated in the coarse coal heating step C were conveyed by the conveyor 24 and the conveyor 24. A bucket conveyor 25 that raises the formed coal and coarse coal to a target height position, and a conveyor 26 that supplies the molded coal and coarse coal into the coal storage tank 23 are sequentially arranged.
In addition, the coal storage tank 23, each conveyor 24,26, and the bucket conveyor 25 are each covered with the casing, and it suppresses and further prevents that the coal conveyed is in direct contact with outside air.

Further, between the fluidized bed dryer 12 serving as the drying classification means and the coal storage tank 23 serving as the high temperature coal conveying means, a bypass connecting the conveyor 22 in the coarse coal heating process C and the conveyor 24 in the high temperature coal conveying process D is connected. It is preferable to provide a conveyor (an example of a bypass conveying path) 27 (two-dot chain line in FIG. 1). The bypass conveyor may connect the fluidized bed dryer 12 serving as a drying classification unit and the conveyor 26 serving as a high-temperature coal conveying unit.
As a result, the coarse coal passes through the airflow heating tower 19 when the internal temperature of the airflow heating tower 19 of the coarse coal heating means is not sufficiently increased (the coarse coal cannot be raised to the temperature range described above). Without detouring, it is conveyed from the dry classification means to the high temperature charcoal conveying means. If the airflow heating tower 19 cannot be used in this way, the temperature of the coarse coal cannot be sufficiently increased. Therefore, the insufficient temperature is used to retain the coarse coal in the fluidized bed dryer 12 of the drying classification means. It is preferable to compensate by increasing the time.

The fluidized bed dryer 12, the collector 13, the molding machine 14, the vibration sieve 15, the airflow heating tower 19, the dust collector 20, and the coal storage tank 23 described above are processing apparatuses that constitute the processing equipment 11. Further, the conveyor 16 described above is a connecting portion between the drying classification process A and the pulverized coal molding process B, the bucket conveyor 21 is a connecting portion between the drying classification process A and the coarse coal heating process C, and the conveyor 24 is a pulverized coal molding process B. It is arrange | positioned in the connection part of the high temperature coal conveyance process D, the coarse-grained coal heating process C, and the high temperature coal conveyance process D, respectively. That is, the conveyor 16, the bucket conveyor 21, and the conveyor 24 are conveyance paths that connect the means of each process. In addition, the conveyor arrange | positioned in the connection part of the pulverized coal shaping | molding process B and the high temperature coal conveyance process D, and the conveyor arrange | positioned in the connection part of the coarse-grained coal heating process C and the high temperature coal conveyance process D are separately carried out. It may be provided. For example, a chain conveyor or a screw conveyor can be used as this conveyor.

Here, the conveyors 16 and 24 and the bucket conveyor 21 of the connection part of each process described above are provided with gate valves (gate materials having sealing properties) 28 to 31 for communicating or blocking between adjacent processes. Yes. In FIG. 1, for convenience of illustration, the conveyor 16 is a block that performs the pulverized coal molding process B, the conveyor 24 is the block that performs the high-temperature coal conveyance process D, and the bucket conveyor 21 is the block that performs the coarse coal heating process C. Respectively.
An inert gas supply pipe (not shown) is provided at either 1 or 2 of the upstream end and the downstream end of the block for performing the process of each step, and for connecting each processing apparatus and these The inert gas is supplied from the end of each block into the casing that covers the transport path (various conveyors other than the conveyors 16 and 24 and the bucket conveyor 21).

At the time of starting up the processing facility, for example, the air remaining in the casing covering the processing device of each means and the various connection conveyance paths can be exhausted in each step. Further, after filling each casing with an inert gas, that is, at the start of transporting coal, the pressure adjusting valves 34 and 35 provided in the exhaust pipes 32 and 33 provided in the dust collector 20 and the conveyor 24, The pressure inside the casing is adjusted in each step. Here, the pressure is adjusted through the exhaust pipes 32 and 33 arranged in the coarse coal heating process C and the high temperature coal conveying process D, but the processing equipment of the dry classification process A and the pulverized coal molding process B or various types It is also possible to adjust the pressure by disposing an exhaust pipe in the connection conveyance path.
The exhausted gas is sent to the exhaust treatment device 36, and after processing corresponding to the environmental standards is performed, it is released to the atmosphere. However, it can be circulated in the processing equipment 11.

Next, a method for starting up a high-temperature coal treatment facility according to an embodiment of the present invention will be described.
When the processing facility 11 is started up (starts operation), the following work is performed in advance.
First, the gate valves 28 to 31 that block inflow and outflow of gas between adjacent processes are closed. Thereby, the gas which remains in each casing moves only in the means used at each process.
Next, in all steps, an inert gas is supplied to the processing device of each means and various conveyors connecting the same according to the following procedure to perform gas replacement. For example, N ₂ gas or Ar gas can be used as the inert gas, but it is economical to use N ₂ gas.

After the start-up preparation is completed, when the processing equipment 11 is started up, that is, at the start of coal transportation, the gate valves 28 to 31 provided between adjacent processes are opened, and the coal transportation route of all processes Communicate.
And after starting operation of the high temperature coal conveyance means which performs processing of high temperature coal conveyance process D first, pulverized coal molding means which performs processing of pulverized coal molding process B, and coarse grain which performs processing of coarse coal heating process C Start operation of charcoal heating means. The pulverized coal forming means for performing the processing of the pulverized coal forming process B and the coarse coal heating means for performing the process of the coarse coal heating process C may be started at the same time. You may start first. Finally, the operation of the dry classification means for performing the processing of the dry classification step A is started.

Thus, since the conveyance of coal is sequentially started from the downstream side to the upstream side of the processing facility 11 for each block that performs the process of each process, the coal in a high temperature state that is conveyed stays between adjacent processes. The coal can be transported to the coke oven 10 without being excessively deprived of heat of coal.
In addition, about the processing equipment 11, although it is operating for every block which processes each process from the downstream to the upstream, about the processing apparatus in the block which processes each process, and various conveyors which connect this However, it is preferable to operate from the downstream side to the upstream side.
Specifically, the following procedure is used.

The high temperature charcoal conveyance means for performing the high temperature charcoal conveyance process D sequentially operates the conveyor 26, the bucket conveyor 25, and the conveyor 24 in this order.
The pulverized coal molding means for performing the process of the pulverized coal molding step B sequentially operates the vibrating sieve 15, the molding machine 14, the bucket conveyor 17, and the conveyor 16 in this order. Note that the conveyor 18 that conveys the pulverized coal below the vibrating sieve 15 is operated before the vibrating sieve 15 is operated or after the bucket conveyor 17 is operated.
The coarse coal heating means for performing the coarse coal heating process C sequentially operates the dust collector 20, the airflow heating tower 19, the conveyor 22, and the bucket conveyor 21 in this order.

Here, the operation of the airflow heating tower 19 means that the temperature of the coarse coal is heated up to the above-described temperature range so that the supplied coal can be reliably transported to the next means. For this reason, with respect to the airflow heating tower 19, a preparatory operation, that is, an internal temperature rise is performed in advance from the start of operation of the processing equipment 11.
The dry classification means for performing the process of the dry classification step A operates the fluidized bed dryer 12 after operating the collector 13.
Thereby, also in each means, the coal in the high temperature state conveyed is conveyed without staying in each means.

Further, when the bypass conveyor 27 described above is provided between the dry classification means for performing the process of the dry classification process A and the high temperature coal transport means for performing the process of the high temperature coal transport process D, the high temperature coal transport means, The operation of the means for carrying out the processes in the respective steps is sequentially started in the order of the pulverized coal forming means, the dry classification means, and the coarse coal heating means.
As described above, the start of transporting the coal by the coarse coal heating means is the last described above for the temperature of the coarse coal supplied to the air flow heating tower 19 in the air flow heating tower 19 of the coarse coal heating means. This is to raise the range to ensure that the supplied coal can be carried out to the next process.

In this case, until the airflow heating tower 19 can be operated, the coarse coal obtained in the drying classification process A is sent to the high-temperature coal conveying process D via the conveyor 27 without being supplied to the airflow heating tower 19. And after the temperature of coarse coal becomes the state which can carry out coal to the next process with the air current heating tower 19, the conveyor 27 is stopped and the coarse coal obtained in the drying classification process A is treated with coarse granules. It is sent to the high-temperature charcoal transport process D via the airflow heating tower 19 and the dust collector 20 of the charcoal heating means.
In addition, when using the conveyor 27, the operation | movement order of each processing apparatus, each conveyor, and each bucket conveyor which processes the above-mentioned high temperature coal conveyance process D, pulverized coal molding process B, and dry classification process A is as above-mentioned. As for the coarse coal heating means for performing the coarse coal heating process C, the conveyor 27, the conveyor 22, and the bucket conveyor 21 are sequentially operated in this order.

In addition, during the transfer of high-temperature coal, by continuously supplying an inert gas into the casing, maintaining the pressure at a positive pressure, while preventing the intake of outside air into the casing, reducing the oxygen concentration, Prevent gas leakage from the casing.
Thus, the coal for metallurgical coke is sequentially passed through the four steps described above, namely, the dry classification step A, the pulverized coal forming step B, the coarse coal heating step C, and the high temperature coal conveying step D, heated and dried. Then, it is conveyed to a carbonization chamber of the coke oven 10 in a high temperature state of 100 ° C. or higher and 300 ° C. or lower to produce coke.
When the coal temperature is less than 100 ° C., it is not necessary to perform gas replacement with the above-described inert gas, and it is not necessary to reduce oxygen concentration and prevent gas leakage from the casing.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where a method for starting up a high-temperature coal treatment facility of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Further, the number and installation positions of the conveyors and bucket conveyors of the embodiment are not limited to the present embodiment, and can be appropriately changed according to the installation location of the processing equipment and the scale of the processing equipment, for example. It is.

It is explanatory drawing of the processing equipment which applies the starting method of the processing equipment of the high temperature coal which concerns on one embodiment of this invention.

Explanation of symbols

10: coke oven, 11: processing equipment, 12: fluidized bed dryer, 13: collector, 14: molding machine, 15: vibrating sieve, 16: conveyor, 17: bucket conveyor, 18: conveyor, 19: airflow heating Tower, 20: Dust collector, 21: Bucket conveyor, 22: Conveyor, 23: Coal storage tank, 24: Conveyor, 25: Bucket conveyor, 26: Conveyor, 27: Conveyor (conveying path for bypass), 28-31: Gate valve, 32, 33: Exhaust pipe, 34, 35: Pressure regulating valve, 36: Exhaust treatment device

Claims (3)

It is a method for starting up a processing facility for heating and drying coal for metallurgical coke and transporting it to a coke oven in a high temperature state,
The processing equipment is
Dry classification means for drying the coal and classifying the coal into powder and coarse particles, pulverized coal forming means for converting the powder obtained by the dry classification means into a formed coal by a molding machine, the drying Coarse coal heating means provided with an airflow heating tower for heat-treating the coarse particles obtained by the classification means with hot air, and the coarse particles treated by the coarse coal heating means and the pulverized coal molding means High temperature coal transport means for transporting and storing the formed coal formed in step 1 to a coal storage tank disposed on the upstream side of the coke oven, and a transport path connecting the means.
When starting the transport of the coal, after starting the operation of the high-temperature coal transport means, start the operation of the pulverized coal forming means and the coarse coal heating means simultaneously or one of the operations first, Further, after that, the operation of the dry classification means is started, and a method for starting up a high-temperature coal treatment facility is provided. It is a method for starting up a processing facility for heating and drying coal for metallurgical coke and transporting it to a coke oven in a high temperature state,
The processing equipment is
Dry classification means for drying the coal and classifying the coal into powder and coarse particles, pulverized coal forming means for converting the powder obtained by the dry classification means into a formed coal by a molding machine, the drying Coarse coal heating means provided with an airflow heating tower for heat-treating the coarse particles obtained by the classification means with hot air, and the coarse particles treated by the coarse coal heating means and the pulverized coal molding means High-temperature charcoal transport means for transporting and storing the coking coal formed in the above to a coal storage tank disposed on the upstream side of the coke oven;
A conveying path for connecting the respective means, and a bypass conveying path for bypassing the air flow heating tower of the coarse coal heating means and connecting the dry classification means and the high temperature charcoal conveying means,
When starting the transport of the coal, the operation of each means is sequentially started in the order of the high temperature coal transport means, the pulverized coal forming means, the dry classification means, and the coarse coal heating means. To start up high-temperature coal processing equipment. 3. The method for starting up a high-temperature coal treatment facility according to claim 1, wherein the temperature of the coal in a high-temperature state is 100 ° C. or more and 300 ° C. or less, the treatment device of each of the means, and the A method for starting up a high-temperature coal treatment facility, wherein each conveyance path is covered with a casing.

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