JP2005138087A - Operation control method of heating and treating facility and its system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To start operation without lowering functions of heating and treating facilities, even after an abnormal condition occurs to stop the operation in the operation process of the facilities. <P>SOLUTION: An operation control method after the abnormal stop of the heating and treating facilities provided with an indirect heating means (first heating furnace 11, second heating furnace 13) for heating materials to be treated, and an indirect heating source (air heating furnace 15) for supplying a heating medium to the heating means, and a gas combustion means (gas combustion furnace 18) for burning gas generated by the heating of the materials comprises the steps of driving, at first, the gas combustion means to preheat to a predetermined temperature, then, driving the indirect heating source to heat the indirect heating means to heat the materials to be treated remaining in the heating means and supplying the gas generated by the treatment to the gas combustion means to perform combustion treatment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention cannot maintain a safe and stable function in a facility for reducing or reducing the amount of processed materials containing various organic substances (solids containing various organic materials, various sludges, soils, etc.) by thermal decomposition reaction. The present invention relates to an operation control method for the facility when such an abnormal situation occurs.

  Various organic substances, various sludges, various treatment objects such as soil and earth and sand (hereinafter, treated objects) are processed by drying, carbonization, ashing, purification, etc. under a reducing atmosphere by indirect heating. ing.

  At that time, the operation plan of the system facility is set in advance, and is operated according to a plan such as an operation of 10 hours / day, an operation of 24 hours / day, or the like.

  Then, plan due to property change (for example, change in bulk specific gravity) of the object to be processed, clogging in the middle of conveyance, increase in the amount of gas generated due to property change of the object to be processed, equipment malfunction, power failure, etc. When operation as planned is hindered and it becomes difficult to maintain safe and stable operation continuation during planned operation, it may be necessary to interrupt and stop the operation. For example, JP-A-2002-180057, JP-A-2000-290667, JP-A-2000-266321, JP-A-11-333432, JP-A-11-241815, JP-A-10-332125, Japanese Patent Application Laid-Open No. 10-089661, Japanese Patent Application Laid-Open No. 9-318026, and Japanese Patent Application Laid-Open No. 9-250727 disclose techniques for handling emergency facilities.

  Therefore, the target of emergency countermeasures is “generated gas and exhaust gas”, and there is no disclosure of techniques such as problems and countermeasures that may occur at the time of subsequent operation restart.

Japanese Patent Application Laid-Open No. 8-49824 discloses a technique for burning dry distillation gas and char generated by thermal decomposition, but problems and countermeasures that may occur at the time of re-operation after interrupting / stopping the operation plan. Is not disclosed.
Japanese Patent Laid-Open No. 2002-180057 JP 2000-290667 A JP 2000-266321 A JP-A-11-333432 Japanese Patent Laid-Open No. 11-241815 Japanese Patent Laid-Open No. 10-332125 JP-A-10-089661 JP 9-318026 A JP-A-9-250727 JP-A-8-49824

  Although it is important to take measures to deal with the generated gas when the operation of the facility is stopped due to an abnormal situation, there are also problems when restarting the operation thereafter. That is, the object to be processed remains in the transportation system and kiln in the facility due to the stoppage. Therefore, during the subsequent operation, these discharges are performed and the operation is performed. However, the heated object to be processed may change its properties and adhere to the inside of the equipment. In this case, it will not be removed, but will remain attached to the inside.

  In such a situation, when the operation of the facility is started (heating, transporting), the temperature is in the process of rising, and the object to be processed adhered in the kiln is decomposed by heating to generate gas. Since this gas is accompanied by odor and the temperature of the gas combustion furnace for burning the gas discharged from the kiln is still low, there is a possibility that the odor cannot be removed and discharged outside the system.

  The present invention has been made in view of such circumstances, and its purpose is to start the operation of the heat processing facility without deteriorating the function of the facility even after an abnormal situation has occurred and stopped. The present invention is to provide an operation control method and system for a heat treatment facility that can be used.

  Therefore, the operation control method and system for a heat processing facility according to the present invention first preheats a gas combustion furnace that combusts generated gas to a predetermined temperature when the heat processing facility is restarted after an abnormal stop. The generated gas can be combusted, and then the indirect heating means that heats the object to be processed is started to burn the generated gas at the start of operation and remove harmful substances and odor components by incineration. . Examples of the abnormal stop include overload stop, abnormal stop, emergency stop, and the like (hereinafter, the same applies to the embodiments described later). Examples of the overload stop include a stop due to an overload of a transport system, a failure of each device, a failure of a part not related to temperature and pressure, and the like. Examples of the abnormal stop include a stop due to an abnormal temperature or pressure (for example, abnormal rise, abnormal stop, etc.) of a heating source such as a hot stove or a gas combustion furnace, gas piping, or exhaust. Examples of the emergency stop include a stop due to a human disaster, a fire, a natural disaster (for example, an earthquake), a power failure, and the like.

That is, the operation control method of the heat processing facility of the present invention comprises a heating means for heating an object to be processed, an indirect heating source for supplying a heating medium to the indirect heating means, and a gas generated by heating the object to be processed. An operation control method after an abnormal stop of a heat processing facility provided with a gas combustion means for burning,
First, the gas combustion means is driven to preheat to a predetermined temperature, and then the indirect heating source is driven to heat the indirect heating means, whereby the object to be processed remaining inside the indirect heating means is heat-treated. The gas generated by the treatment is supplied to the gas combustion means for combustion treatment.

More specifically, the operation control method includes an indirect heating means for heating the object to be processed, an indirect heating source for supplying a heating medium to the indirect heating means, and a gas generated by heating the object to be processed. A heating processing facility provided with a gas combustion means for burning is an operation control method for the facility after being stopped in the middle without being operated according to a predetermined operation schedule,
A step (1) of driving the indirect heating means without heating and discharging the object to be processed remaining inside;
A step (2) of driving the gas combustion means to preheat to a predetermined temperature;
The indirect heating source is driven to heat the indirect heating means, so that the object to be processed remaining inside the heating means is indirectly heated (3),
First, the steps (1) and (2) are performed in parallel or sequentially, and then the step (3) is performed so that the gas combustion means combusts the gas generated by the execution of the step (3). is there.

  In this operation control method, the operation plan of the step (2) is activated by the start or end signal of the step (1) to start preheating, and the set temperature of the gas combustion means as the stop condition of the step (2) Or you may perform a process (3), after setting a heating time schedule and satisfy | filling stop conditions.

  Further, after reaching the set temperature in step (3), a new object to be processed is introduced and operation based on the operation schedule is performed. After the operation is completed, steps (1), (2) and (3) are invalidated. It may be.

The operation control system for a heat processing facility according to the present invention includes an indirect heating means for heating an object to be processed, a heating source for supplying a heating medium to the indirect heating means, and a gas generated by heating the object to be processed. In a heat treatment facility equipped with a burning gas combustion means, the indirect heating means is driven without heating and remains inside when restarting operation after being stopped halfway without being operated according to a predetermined operation schedule. Indirect heating by discharging the workpiece to be processed (1), driving the gas combustion means to preheat to a predetermined temperature (2), and driving the indirect heating source to heat the indirect heating means An operation control system for a heat treatment facility that performs the step (3) of heat-treating an object to be processed remaining inside the means,
Means for outputting a start or end signal of step (1);
Means for receiving the signal to drive the gas combustion means and enable the gas combustion means reach set temperature or the heating time schedule stop condition;
Means for outputting a stop condition arrival signal by satisfying the stop condition;
In response to the condition attainment signal, a means for outputting a signal for starting a heating operation for heating the indirect heating means is provided.

In this operation control system, upon receiving the signal to start the heating operation, the indirect heating means is heated by the heating source, and after reaching the set temperature, a new object is introduced and the operation based on the operation schedule is performed. Means for outputting a signal;
And a means for receiving a signal indicating the end and outputting a signal that invalidates the stop condition arrival signal and the signal for starting the heating operation.

  The operation control method or system for a heating processing facility as described above may include a step of driving a conveyance system including the heating unit when the heating unit is heated, or a unit for outputting a signal for executing the step. Good.

  As described above, according to the operation control method and system of the heat treatment facility of the present invention, when the transport system is stopped due to an abnormal situation and restarted after a certain period of time, first, the gas combustion furnace is driven and decomposed. When gas is introduced, an environment for burning the gas is formed, and then the indirect heating means positioned in the transport system is heated to heat the object to be processed remaining inside the heating means and the object to be processed Since the gas generated from is burned in a gas combustion furnace, no harmful substances or odorous substances are emitted.

  Also, at the time of re-operation, first, since the processing system discharge process is executed by driving the conveyance system without heating the processed material, the operation control system after stopping is started based on this process. This discharge process activates the operation control system after emergency stop to drive the gas combustion furnace, drives the indirect heating source that heats the indirect heating means after reaching a certain condition, and finishes according to the subsequent operation schedule As a result, since the operation control system after the stop is released, the troublesome and special work is not necessary for the operation operation after the stop.

  Therefore, according to the present invention, even after the heat processing facility is stopped due to an abnormal situation, the operation can be started without deteriorating the function of the facility.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a facility having an operation control system of the present invention.

  In the heat processing facility of the present embodiment, the workpiece is dried and thermally decomposed by indirect heating to obtain a carbide.

  The 1st heating furnace 11 is an indirect heating means for drying indirectly by heating a to-be-processed object at 350-450 degreeC under fixed residence time. The first heating furnace 11 adopts a rotary kiln system, and external heating means for heating the rotary furnace 110 from the outside by circulating hot air gas around the rotary furnace 110 to the rotary furnace 110 into which the workpiece is introduced. A heating jacket 111) is attached. The hot air gas is introduced from a hot air furnace 15 described later.

  The rotary furnace 110 has a cylindrical shape, is supported by a plurality of support rollers, and is rotated by a rotating means having a rotation drive source. At this time, a plurality of feed blades (not shown) for stirring and transporting the introduced workpiece may be provided inside the rotary furnace 110. On one end side of the rotary furnace 110, the rotary furnace 130 is rotatably and airtightly connected to the duct 10 through a seal member. The duct 10 is connected to a processing object supply means such as a hopper facility in order to carry the processing object.

  The second heating furnace 13 is an indirect heating means for indirectly heating and carbonizing the dried object to be processed at 450 to 600 ° C. under a certain residence time. The second heating furnace 13 employs a rotary kiln system in the same manner as the first heating furnace 11, and has a heating jacket 131 attached to a rotary furnace 130 that introduces a dried object to be processed and that is stirred and conveyed. The rotary furnace 130 has a cylindrical shape, is supported by a plurality of support rollers, and is rotated by a rotating means having a rotation drive source. At one end of the rotary furnace 130, a duct 12 for introducing the dried product discharged from the first heating furnace 11 is connected to the rotary furnace 130 in a rotatable and airtight manner via a seal member. The duct 12 is connected to a pipe for sucking water vapor and pyrolysis gas generated in the first heating furnace 11 and the second heating furnace 13 and supplying them to the gas combustion furnace 18. On the other hand, a duct 14 for discharging carbide generated in the second heating furnace 13 is connected to the other end of the rotary furnace 130 in a freely and airtight manner via a seal member.

  The hot air furnace 15 is an indirect heating source that supplies hot air gas, and includes a combustion burner for generating hot air gas. The hot air gas is supplied to the heating jacket 131 of the second heating furnace 13 by the blower 16 to heat the rotary furnace 130 and then supplied into the heating jacket 111 of the first heating furnace 11 to heat the rotary furnace 110. At this time, temperature adjusting air is appropriately injected into the hot air gas, and the gas temperature is adjusted. The heating medium (hot air gas) discharged from the heating jacket 111 is exhausted. A part of the heating medium is used by the blower 17 as an ejector driving gas in the gas combustion furnace 18 or as a hot air gas supplied to the heating jackets 111 and 131.

  The gas combustion furnace 18 uses the steam and pyrolysis gas introduced from the first heating furnace 11 and the second heating furnace 13 under a certain atmosphere and residence time (for example, an atmosphere of 800 ° C. or higher, more specifically, (For example, a residence time of 2 seconds or more in an atmosphere of about 850 ° C.) is a gas combustion means for detoxifying by combustion. Air is appropriately introduced into the gas to be treated from outside the system to assist combustion. The gas combustion furnace 18 includes a gas combustion chamber to which a gas to be treated is supplied, and is provided with a combustion burner. Combustion by the combustion burner is appropriately controlled by adjusting the amount of fuel supplied. The gas burned in the gas combustion furnace 18 is sucked into the blower 21 and exhausted through the heat exchanger 19 and the bag filter 21.

  The heat exchanger 19 cools the gas to about 200 to 150 ° C. by a gas-gas heat exchange system using air as a cooling medium. At this time, fresh air not containing at least a sulfur component is appropriately supplied to the gas to be cooled (combusted gas), and the gas temperature is adjusted appropriately. The cooled gas is further supplied to the bag filter 20 and subjected to dust removal treatment, and then discharged from the system. On the other hand, the air heated by the heat exchange is used for generating hot air gas in the hot air furnace 15.

  Each device in the facility is controlled for normal operation and operation after an abnormal stop by control means not shown. An operation example of the operation control system of the present embodiment will be described with reference to FIGS.

  First, normal operation will be described with reference to the time chart shown in FIG. 2 and the flowchart (S101 to S108) shown in FIG. T in FIG. 2 represents time (the same applies to the time charts in FIGS. 4 to 6).

(1) Start of input The piping (steam pipe, dry distillation gas) in the facility is cleaned in advance and the deposits inside the piping are removed (S101). When receiving a command of the preheating operation (S102, t _0), the burner is ignited in a hot air oven 15 and a gas fired furnace 18 (S103, S104), preheated to a predetermined set temperature (e.g., hot air oven 650 ° C., a gas-fired furnace 800 ° C.), the first heating furnace 11 and the second heating furnace 13 are heated. After completion of preheating (S105), that is, at the time when each heating furnace temperature shown in FIG. 2 reaches a set value (t ₁ ), the workpiece is charged, dried and pyrolyzed, and processed products (dried material, (Carbide, ash and purified product) are obtained (S106).

(2) Stop After operation for a predetermined time (t ₂ -t ₁ ), the workpiece is input and the stop mode is entered (S107). After a certain time (for example, 30 to 60 minutes) after stopping the charging, the processed product is discharged from the first and second heating furnaces 11 and 13, so the burner of the hot stove 15 that heats the heating furnace. After a certain time (t ₄ -t ₃ , for example, 30 minutes), the burner of the gas combustion furnace 18 is turned off (S108). In this way, the gas combustion furnace 18 is stopped at the end so that the gas components in the piping system are burned so that no harmful substances such as odors remain in the exhaust gas.

  Next, the operation of the facility after an emergency stop will be described with reference to the time charts shown in FIGS. 4 to 6 and the flowchart (S201 to S213) shown in FIG.

(3) Emergency stop During an operation of the heat treatment facility, when an abnormal situation occurs that cannot maintain a safe and stable function for the facility at a part of the facility (for example, an abnormal pressure increase or temperature of each device) An abnormal rise, clogging of workpieces and workpieces in the transport system, etc.) and immediately stopping the operation to prevent an accident. Here, as shown in FIG. 4, at the time (t ₅ ) when an abnormal situation is detected, the rotary furnaces 111 and 131 of the first and second heating furnaces 11 and 13 and the other transport system devices are stopped, and then After a certain time (t ₆ ), the burners of the hot stove 18 and the gas combustion furnace 19 are stopped. At this time, the gas combustion furnace 19 may be delayed and stopped.

FIG. 5 shows a time chart when restarting the conventional operation. After each apparatus cools below a certain temperature, the first and second heating furnaces 11 and 13 and the transport system are driven to discharge the workpieces remaining in these apparatuses. Next, preheating is performed by operating the burners of the hot air furnace 15 and the gas combustion furnace 18 (t ₁₀ -t ₉ ). However, since the first and second heating furnaces 11 and 13 and the object to be processed inside the transport system remain adhered, it is difficult to completely discharge them. Therefore, the odor is generated because the residue is heated with the start of preheating. Since the temperature in the gas combustion furnace 18 is still low at this time, it is difficult to completely decompose the odor.

  Therefore, the operation control system of this embodiment executes the time chart shown in FIG. 6 and the flowchart shown in FIG.

(4) Operation after emergency stop First, when a command for discharge operation is received (S201), the timer of the control means becomes valid (S205), and the first and second heating furnaces 11, 13 and the transport system are driven. Te, the object to be processed remaining inside these devices is discharged without being heated _{(S202, t 12 -t 11)} . Next, when a preheating operation command is received (S203), the burner of the gas combustion furnace 18 is activated and preheating is started (S204). The atmosphere in the gas combustion furnace 18 is a set temperature (e.g., 800 ° C.) (S206) together to reach, the when the timer has been set to time (e.g. 30 minutes) has elapsed (S207, t ₁₄ -t ₁₃ ), The hot stove 15 receives a burner activation command (S208), and starts preheating. At this time, even if the object to be processed remaining in the first and second heating furnaces 11 and 13 is heated by the hot air gas generated in the hot air furnace 15, the gas is generated in the gas combustion furnace 18. Since it is burned, no odor is generated. Then, the temperature of the first and the heating furnace 11 and 13 due to hot gas from the hot air furnace 15 reaches the set value (S209), starts the insertion of the object to be processed (S210, t _15). After the operation for a predetermined time, the workpiece is charged and the operation ends / cooling mode is entered (S211). As described above, the processed product of the object to be processed is discharged from the heating furnaces 11 and 13 after a certain time (for example, 30 to 60 minutes) after the charging is stopped, so that the hot stove 15 that heats the heating furnaces 11 and 13 is used. The burner in the gas combustion furnace 18 is turned off after a certain time (S212). Also at this time, the gas combustion furnace 19 may be delayed and stopped. When each device is normally terminated, the timer becomes invalid (S213). Thereby, in the next operation, the discharge operation (S201) is not necessary, the burner of the gas combustion furnace 18 is started, the burner of the hot stove 15 is subsequently started, and preheating is started (FIG. 2, S103). , S104).

  As described above, according to the operation control system of the present embodiment, when the transport system is stopped in an abnormal state and restarted after a certain time, first, when the gas combustion furnace 18 is driven and cracked gas is introduced. Next, an environment for burning the gas is formed, and then the first heating furnace 11 and the second heating furnace 13 that are positioned in the transport system are heated to heat the object to be processed and generate from the object to be processed. Since the gas is burned in the gas combustion furnace 18, no harmful substances or odorous substances are discharged.

  Also, during operation after an abnormal stop, first, the processed product is discharged by driving the transport system without heating the processed product. Therefore, the operation control after the stop is performed based on this step. The system can be started, and this discharge process activates the operation control system after an abnormal stop and drives the gas combustion furnace 18 to heat the first heating furnace 11 and the second heating furnace 13 after reaching a certain condition. When the hot stove 15 is driven and finished according to the subsequent operation schedule, the operation control system after the stop is released, so that no complicated and special work is required for the operation after the stop.

The schematic block diagram of the plant | facility which has the operation control system of this invention. Time chart during normal operation. The flowchart at the time of normal driving | operation. Time chart during emergency operation. Time chart when resuming conventional operation. Time chart during operation after emergency stop. The flowchart at the time of the operation | movement after an emergency stop.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... 1st heating furnace, 13 ... 2nd heating furnace, 110, 130 ... Rotary furnace, 111, 131 ... Heating jacket 15 ... Hot-blast furnace 18 ... Gas combustion furnace 19 ... Heat exchanger 20 ... Bag filter

Claims (7)

Non-heating processing facility comprising an indirect heating means for heating an object to be processed, a heating source for supplying a heating medium to the indirect heating means, and a gas combustion means for burning a gas generated by heating the object to be processed. An operation control method after a normal stop,
First, the gas combustion means is driven to preheat to a predetermined temperature, and then the heating source is driven to heat the indirect heating means, whereby the object to be processed remaining in the indirect heating means is heat-treated. A method for controlling the operation of a heating processing facility, wherein the gas generated by the above is provided to a gas combustion means for combustion treatment. A heating processing facility comprising an indirect heating means for heating an object to be processed, a heating source for supplying a heating medium to the indirect heating means, and a gas combustion means for burning a gas generated by heating the object to be processed, An operation control method for the facility after stopping in the middle without being operated according to a predetermined operation schedule,
A step (1) of driving the indirect heating means without heating and discharging the processing object remaining in the indirect heating means;
A step (2) of driving the gas combustion means to preheat to a predetermined temperature;
A step (3) of indirectly heating the object to be processed remaining inside the heating means by driving the indirect heating source to heat the heating means;
First, the steps (1) and (2) are performed in parallel or sequentially, and then the step (3) is performed so that the gas combustion means performs the combustion treatment of the gas generated by the execution of the step (3). An operation control method for a heat processing facility. The operation plan of the step (2) is started by the start or end signal of the step (1) to start preheating, and the set temperature or heating time schedule of the gas combustion means is set as a stop condition of the step (2). 3. The operation control method for a heat processing facility according to claim 2, wherein the step (3) is executed after the stop condition is satisfied. After reaching the set temperature in step (3), a new object to be processed is introduced to perform operation based on the operation schedule, and after the operation is completed, steps (1), (2), and (3) are invalidated. The operation control method of the heat processing facility according to claim 3. In a heat treatment facility comprising an indirect heating means for heating an object to be processed, a heating source for supplying a heating medium to the indirect heating means, and a gas combustion means for burning a gas generated by heating the object to be processed, A step (1) of driving the indirect heating means without heating and discharging the object to be processed remaining inside when restarting the operation after being stopped in the middle without being operated according to a predetermined operation schedule; and gas A step (2) of driving the combustion means to preheat to a predetermined temperature and a step of heating the indirect heating means by driving the indirect heating source to heat the object to be processed remaining inside the indirect heating means ( 3) an operation control system of a heat processing facility for executing
Means for outputting a start or end signal of step (1);
Means for receiving the signal to drive the gas combustion means and enable the gas combustion means reach set temperature or the heating time schedule stop condition;
Means for outputting a stop condition arrival signal by satisfying the stop condition;
An operation control system for a heating processing facility, comprising: means for receiving a signal for reaching the condition and outputting a signal for starting a heating operation for heating the heating means. Means for receiving a signal for starting the heating operation, heating the indirect heating means by an indirect heating source, supplying a new object after reaching a set temperature, performing an operation based on the operation schedule, and outputting a finished signal; ,
The operation control of the heating processing facility according to claim 5, further comprising means for receiving a signal indicating the end and outputting a signal that invalidates the stop condition arrival signal and the signal for starting the heating operation. system. 7. The method according to claim 1, further comprising a step of driving a conveyance system including the indirect heating means when driving the indirect heating means, or a means for outputting a signal for executing the step. The operation control method or system of the described heat processing facility.

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