JP5131597B2 - Operation control method of heat storage combustion type exhaust gas purification device - Google Patents

Description

  The present invention relates to an operation control method for a heat storage combustion type exhaust gas purification device. More specifically, while the production facility equipped with the heat storage combustion type exhaust gas purification device is temporarily stopped due to production preparation or the like, the exhaust gas containing volatile organic compounds (hereinafter referred to as VOC) is not exhausted. The present invention relates to an operation control method for controlling the operation of an exhaust gas purifier from a processing operation to a standby operation.

  Conventionally, as shown in FIG. 7, a first tower having a heat storage chamber 1 having a first heat storage body 1a disposed therein and a second tower having a heat storage chamber 2 having a second heat storage body 2a disposed therein. Are arranged in parallel, and a main body having a structure in which the upper portions of the heat storage bodies 1a and 2a are formed as a common combustion chamber 3, and inlet dampers 4a and 5a connected to the lower sides of the heat storage bodies 1a and 2a, respectively. Outlet dampers 4b and 5b, exhaust gas supply pipe 6a connected to inlet dampers 4a and 5a, treated purified gas exhaust pipe 6b connected to outlet dampers 4b and 5b, and inlet damper 4a in the exhaust gas supply pipe 6a 5a, a blower 7 connected to the upstream position of the exhaust gas supply pipe 6a, a suction line 8 extending from the exhaust gas supply pipe 6a to the production facility, and a suction shut-off damper 9 and a cold air intake damper 10 for switching between exhaust gas suction and shut-off, Switching the damper Fine combustion chamber regenerative-combustion exhaust gas purifying apparatus and a control device A to control the temperature of (Regenerative Thermal Oxidizer: RTO) is (for example, Patent Document 1). The combustion chamber 3 is provided with a burner 11 and a temperature sensor 12 for monitoring the temperature.

  In this heat storage combustion type exhaust gas purification apparatus, the exhaust gas that has passed through the first heat storage body 1a is subjected to high-temperature combustion decomposition treatment in the combustion chamber 3 that is maintained at a temperature necessary for target component decomposition, and the purified gas after combustion is treated. The 2nd thermal storage body 2a is allowed to pass through. At this time, the heat from the purified gas is stored in the second heat storage body 2a, and the cooled purified gas is discharged to the outside air.

  In a conventional heat storage combustion type exhaust gas purification device, the time from the temperature raising operation mode of the purification device to the exhaust gas treatment command of the production facility (e.g., in the gas treatment preparation stage) by changing the product to be treated in the production facility on the suction line 8 side. The thermal storage combustion exhaust gas purifier is in standby operation when exhaust gas containing VOC is not exhausted when the time is long or when the gas treatment operation is temporarily stopped due to product replacement in the production facility after the exhaust gas treatment command. It becomes a mode.

  In the standby operation mode, combustion is performed while maintaining thermal equilibrium between the heat storage elements 1a and 2a installed in the first tower and the second tower so that exhaust gas containing VOC from the suction line 8 side can be treated at any time. In this operation, the chamber 3 is maintained at a predetermined temperature (about 800 to 850 ° C.) or higher. In this standby operation mode, the exhaust gas path on the suction line 8 side is blocked by the suction cutoff damper 9, so that the air is taken in from the cold air intake damper 10.

For example, as shown in FIG. 8, when the temperature raising operation mode is selected based on the automatic operation input (step S1), the cold air intake damper is opened (step S2).
Then, as shown in Table 1, the first damper cycle operation for tower switching and the setting of the temperature raising operation air volume of the blower are performed, and the burner is operated (step S3).

  In the first damper cycle operation, the opening and closing operations of the inlet damper and the outlet damper of the first tower and the second tower are repeated alternately in pattern 1 and pattern 2. That is, as shown in FIG. 10, a pattern in which the inlet damper 4a of the first tower and the outlet damper 5b of the second tower are switched to the open state and the first outlet damper 4b and the second inlet damper 5a are switched to the closed state. 1 and the pattern 2 in which the inlet damper 4a of the first tower and the outlet damper 5b of the second tower are switched to the closed state and the first outlet damper 4b and the second inlet damper 5a are switched to the open state are alternately repeated. In addition, the arrow X in FIG. 10 has shown the airflow direction.

Next, it is determined whether or not a temperature in the combustion chamber, for example, a set value of 850 degrees has been reached (step S4).
Based on this determination, if it is determined that the temperature of the combustion chamber is lower than the set value, the determination is made again. If it is determined that the temperature of the combustion chamber is equal to or higher than the set value, the input of the exhaust gas treatment command is received. Then, the processing operation mode of the production facility is selected (step S5).

  On the other hand, for example, when it takes time to change the product to be processed in the production facility and no exhaust gas treatment command is input, the standby operation mode is selected.

  When this standby operation mode is selected, as shown in FIG. 9, after the standby operation air volume of the blower is set, whether or not the temperature at which the burner during operation is stopped and the fire extinguishing reaches the set value is determined. Is determined (steps S6 and S7).

If it is determined that the temperature is lower than the set value based on this determination, the determination is performed again.
And if it is judged that it is more than a set value based on judgment, a burner will be stopped (Step 8).

  Next, when the burner is stopped, it is determined whether or not the temperature at which the burner is operated and ignited again reaches a set value, for example, 850 ° C., in order to maintain the combustion chamber at a predetermined temperature or higher. (Step 9).

If it is determined that the temperature to be ignited again exceeds the set value based on this determination, the determination is performed again.
If it is determined that the temperature is equal to or lower than the set value based on the determination, the burner is operated (step 10).
Thereafter, steps 7 to 10 are repeated in synchronism with steps 3 to 4 described above until an input signal of the exhaust gas treatment command is acquired.

Japanese Patent Laid-Open No. 2004-77017

During standby operation in a conventional heat storage combustion exhaust gas purification device, the atmosphere is introduced by a cold air intake damper, so the combustion chamber is maintained at a predetermined temperature or higher based on determination of the set value of the burner reignition temperature (step 9). If you try, you will need to use a burner to help.
For this reason, if the time taken to repeat step 9 is long, the burner operation time becomes long, so the burner usage time is long, the burner life is likely to be shortened, and the fuel consumption of the burner is reduced. Is difficult.

  Therefore, in view of the above circumstances, the present invention has an object to provide an operation control method for a regenerative combustion exhaust gas purification device that ensures the life of a burner in a combustion chamber and reduces fuel consumption during standby operation. To do.

  In the operation control method of the heat storage combustion exhaust gas purification apparatus of the present invention, a plurality of towers having heat storage chambers provided with heat storage bodies are arranged in parallel, and the upper part of each heat storage body is made a common combustion chamber provided with a burner. A main body having a structure, an inlet damper and an outlet damper connected to each of the heat storage members, an exhaust gas supply pipe connected to the inlet damper, and a treated purified gas exhaust pipe connected to the outlet damper A blower connected to the upstream position of the inlet damper in the exhaust gas supply pipe, and a suction shut-off damper and a cold air intake damper that are connected to a suction line extending from the exhaust gas supply pipe to the production facility and that switch between suction and shut-off of the exhaust gas A regenerative combustion-type exhaust gas purification apparatus comprising a control device that controls the switching of each damper and the temperature of the combustion chamber, and has an operation mode having a first damper cycle operation for tower switching. An operation control method for controlling by switching to a standby operation mode based on a gas treatment command, wherein at least an entrance damper and an outlet damper of adjacent towers are sequentially opened in the standby operation mode switched based on the exhaust gas treatment command It is characterized by including a step of performing a tower switching second damper cycle operation that repeats a pattern in which the inlet damper and outlet damper of another tower are switched to a closed state when switched to.

  According to the present invention, since the second damper cycle operation during the standby operation is performed to discharge the atmosphere without passing through the heat storage body in the tower, the time for supporting the combustion with the burner in the combustion chamber is reduced. Can do.

  Thereby, the lifetime of the burner during standby operation can be ensured and the fuel consumption can be reduced.

It is the schematic of the thermal storage combustion type exhaust gas purification apparatus concerning one embodiment of this invention. It is an operation | movement flowchart of the thermal storage combustion type exhaust gas purification apparatus of FIG. It is a flowchart of the standby operation mode of FIG. It is a schematic diagram which shows the 2nd damper cycle driving | operation in the standby driving | operation of FIG. It is the schematic of the heat storage combustion type exhaust gas purification apparatus concerning other embodiment of this invention. It is a schematic diagram which shows the 2nd damper cycle driving | operation at the time of the standby driving | operation of FIG. It is the schematic of the conventional heat storage combustion type exhaust gas purification apparatus. It is an operation | movement flowchart of the conventional heat storage combustion type exhaust gas purification apparatus. It is a flowchart of the standby operation mode of FIG. It is a schematic diagram which shows the 1st damper cycle driving | operation in the conventional standby driving | operation.

  The present invention can be applied to a heat storage combustion type exhaust gas purifying apparatus having a two-tower type, a three-tower type, or a multi-tower type depending on the number of heat storage chambers. The two-column heat storage combustion exhaust gas purification device has the simplest structure and can be made compact.

  Hereinafter, the operation control method of the regenerative combustion type exhaust gas purification apparatus of the present invention will be described based on the attached drawings. The regenerative combustion exhaust gas purification apparatus according to an embodiment applied to the present invention is the same as the regenerative combustion exhaust gas purification apparatus shown in FIG. The difference is that B is used.

  As shown in FIG. 1, the heat storage combustion exhaust gas purifying apparatus of the present embodiment includes a first tower T1 and a second heat storage body 2a each having a heat storage chamber 1 in which a first heat storage body 1a is disposed. A main body having a structure in which the second tower T2 having the arranged heat storage chamber 2 is arranged in parallel, and the upper part of each heat storage body 1a, 2a is a common combustion chamber 3 provided with a burner 3a, and each heat storage body Inlet dampers 4a and 5a and outlet dampers 4b and 5b connected below 1a and 2a, exhaust gas supply pipe 6a connected to inlet dampers 4a and 5a, and processed to be connected to outlet dampers 4b and 5b, respectively The purified gas exhaust pipe 6b, the blower 7 and the cold air introduction damper 8 connected to the upstream positions of the inlet dampers 4a and 5a in the exhaust gas supply pipe 6a, and the suction line 10 extending from the exhaust gas supply pipe 6a to the production facility. Exclude It includes a suction shutoff damper 9 and the cold air introduction damper 8 switches the suction and blocking of the scan, and a control unit B for controlling the temperature of the switching and the combustion chamber of each damper.

  Next, the operation control of the regenerative combustion exhaust gas purification apparatus in the present embodiment will be described. As shown in FIG. 2, the control after the heating operation mode (step S) is the same as the control described in FIG. Since it is the same, description is abbreviate | omitted and it demonstrates after standby operation mode.

When the standby operation mode is selected, the burner is stopped and the setting of the air volume of the second damper cycle operation for tower switching and the second damper cycle operation of the blower is performed almost simultaneously (steps SS1, SS2).
The burner is stopped and the air volume is set almost simultaneously in the second damper cycle operation for tower switching and the second damper cycle operation for the blower. For example, when the second damper cycle operation for tower switching is performed, Also, the burner stop operation and the air volume setting operation of the second damper cycle operation can be performed at different timings.

  In the second damper cycle operation, as shown in FIG. 4 and Table 2, the inlet damper 4a and the outlet damper 4b of the first tower T1 are switched to the open state, and the inlet damper 5a and the outlet damper 5b of the second tower T2 are The pattern 1 that switches to the closed state and the pattern 2 that switches the inlet damper 5a and the outlet damper 5b of the second tower T2 to the open state and the inlet damper 4a and the outlet damper 4b of the first tower T1 to the closed state are alternately repeated. . In addition, the arrow Y in FIG. 4 has shown the airflow direction.

  Next, in order to maintain the combustion chamber at a predetermined temperature or higher, it is determined whether or not a temperature at which the burner is operated and ignited again, for example, a set value of 780 to 800 ° C. has been reached (step SS3).

Based on this determination, if it is determined that the temperature to be ignited again (combustion chamber temperature) exceeds the set value, the determination is performed again.
Then, based on this determination, if it is determined that the temperature of the combustion chamber is equal to or lower than the set value, the air volume is set for the first damper switching cycle operation for tower switching and the standby operation for the blower, and the burner is set almost simultaneously. Drive (step SS4).
In addition, while setting the air volume of the tower switching first damper cycle operation and the standby operation of the blower, the burner is operated almost simultaneously. For example, when performing the tower switching first damper cycle operation, the standby operation is performed. The air volume setting operation and the burner operation can be performed at different timings.

  As shown in FIG. 8 and Table 1, the first damper cycle operation at this time is the same as the first damper cycle operation in the temperature raising operation mode, and the inlet dampers 4a of the first tower and the second tower, The opening / closing operation of 5a and outlet dampers 4b and 5b repeats pattern 1 and pattern 2 alternately.

  Next, it is determined whether or not the operating burner is stopped and the temperature to be extinguished has reached the set value (step SS5).

If it is determined that the fire extinguishing temperature of the burner is lower than the set value based on this determination, the determination is performed again.
And if it is judged that temperature is more than a preset value based on judgment, it will shift to Step SS2 and will stop a burner.
The steps SS2 to SS5 are repeated until the operation of the production facility returns.

In the present embodiment, the second damper cycle operation during the standby operation is controlled to discharge the atmosphere without passing through the heat storage body in the tower, so that the time for auxiliary combustion with the burner in the combustion chamber is reduced. Can do.
Thereby, since the lifetime of the burner currently used is ensured and fuel consumption is reduced, energy saving operation can be achieved.
Furthermore, since the atmosphere is not passed through the heat storage body in the tower, a predetermined air volume for passing the heat storage body is not necessary, and the air volume can be changed by lowering the rotational speed of the blower controlled by the inverter. Thereby, an energy saving effect can be expected by lowering the rotational speed.

  In the present embodiment, the standby operation mode in which the time from the temperature raising operation mode of the purification device to the exhaust gas treatment command of the production facility becomes longer due to, for example, setup change of the product to be treated in the production facility on the suction line 8 side. However, the present invention can also be applied to a case where, for example, the product is temporarily stopped due to product replacement in the production facility during the gas processing operation after the exhaust gas processing command. However, in this case, additional changes are made as appropriate, such as a step of closing the suction shut-off damper as a step subsequent to step SS1.

  Further, in the present embodiment, a two-column heat storage combustion type exhaust gas purification device has been described, but the present invention is not limited to this, and a three-column or multi-column heat storage device depending on the number of heat storage chambers. It can be applied to a combustion exhaust gas purification device.

  For example, as shown in FIG. 5, in a three-column heat storage combustion exhaust gas purification apparatus, a third column T3 is arranged in parallel with the first column T1 and the second column T2, and the first column A purge pipe 21 communicating with the cold air intake damper 10 is connected to the tower T1, the second tower T2, and the third tower T3 via a first tower purge damper 22a, a second tower purge damper 22b, and a third tower purge damper 22c, respectively. Yes.

  Unlike the two-tower thermal storage combustion exhaust gas purification apparatus, this three-tower thermal storage combustion exhaust gas purification apparatus needs to be connected to the purge pipe 21, so the tower in the three-tower thermal storage combustion exhaust gas purification apparatus As shown in FIG. 5 and Table 3, the first damper cycle operation for switching is performed in each of the inlet dampers 4a, 5a, 23a, and the outlet dampers 4b, 5b of the first tower T1, the second tower T2, and the third tower T3. , 23b and purge dampers 22a, 22b, and 22c are alternately switched between pattern 1, pattern 2, and pattern 3.

  However, in the second tower switching second damper cycle operation in the three-column heat storage combustion exhaust gas purification apparatus, since the purge dampers 22a, 22b and 22c are closed, the second tower switching second operation of the two-column heat storage combustion exhaust gas purification apparatus is performed. Similarly to the damper cycle operation, as shown in FIG. 6 and Table 4, the inlet damper 4a and the outlet damper 4b of the first tower T1 are switched to the open state, and the inlet dampers 5a of the second tower T2 and the third tower T3, 23a and the outlet dampers 5b and 23b are switched to the closed state, and the inlet damper 5a and the outlet damper 5b of the second tower T2 are switched to the open state, and the inlet damper 4a and the outlet damper 4b of the first tower T1 Pattern 2 as a pattern in which the entrance damper 23a and the exit damper 23b of the third tower T3 are switched to the closed state, and the third tower Pattern 3 as a pattern in which the inlet damper 23a and the outlet damper 23b of the third tower are switched to the open state and the inlet damper 4a and the outlet damper 4b of the first tower T1 and the inlet damper 5a and the outlet damper 5b of the second tower T2 are switched to the closed state. And repeat.

  Further, in the case of a 4-tower heat storage combustion exhaust gas purification device, the purge pipe is not necessary, so the second damper cycle operation for tower switching is performed in the heat storage combustion exhaust gas purification of the second tower or the third tower. Similar to the apparatus, when the inlet damper and the outlet damper of the adjacent tower are sequentially switched to the open state, the pattern in which the inlet damper and the outlet damper of the other tower are switched to the closed state is repeated.

B Control device T1 First tower T2 Second tower T3 Third tower 1, 2 Heat storage chamber 1a First heat storage body 2a Second heat storage body 3 Combustion chambers 4a, 5a, 23a Inlet dampers 4b, 5b, 23b Outlet damper 6a Exhaust gas supply pipe 6b Purified gas exhaust pipe 7 Blower 8 Suction line 9 Suction shut-off damper 10 Cold air intake damper 11 Burner 12 Temperature sensor 21 Purge piping 22a, 22b, 22c Purge damper

Claims (8)

A main body having a structure in which a plurality of towers each having a heat storage chamber provided with a heat storage body are arranged in parallel and the upper part of each heat storage body is a common combustion chamber provided with a burner is connected to the lower side of each heat storage body. An inlet damper and an outlet damper, an exhaust gas supply pipe connected to the inlet damper, a treated purified gas exhaust pipe connected to the outlet damper, and an upstream position of the inlet damper in the exhaust gas supply pipe Connected to a suction line extending from the exhaust gas supply pipe to the production facility, a suction shut-off damper and a cold air intake damper for switching exhaust gas suction and shut-off, and a control device for controlling the switching of each damper and the temperature of the combustion chamber In the heat storage combustion type exhaust gas purification apparatus, the operation mode having the first damper cycle operation for tower switching is switched to the standby operation mode based on the exhaust gas treatment command. A operation control method of,
A tower that repeats a pattern in which the inlet damper and outlet damper of other towers are switched to the closed state when the inlet damper and outlet damper of the adjacent tower are sequentially switched to the open state at least in the standby operation mode switched based on the exhaust gas treatment command An operation control method for a regenerative combustion type exhaust gas purification apparatus, comprising a step of performing a second damper cycle operation for switching. The operation control method of the regenerative combustion exhaust gas purification apparatus according to claim 1, wherein the step of performing the first damper cycle operation for tower switching is performed after the step of performing the second damper cycle operation for tower switching. The regenerative combustion exhaust gas purification apparatus according to claim 2, wherein a step of stopping the burner and a step of setting the air volume of the second damper cycle operation of the blower are performed during the step of performing the second damper cycle operation for tower switching. Operation control method. The operation of the regenerative combustion exhaust gas purification apparatus according to claim 2 or 3, wherein, in the step of performing the first damper cycle operation for tower switching, the step of setting the air volume of the standby operation of the blower and the step of operating the burner are performed. Control method. After the step of determining whether or not it is a set value of the temperature at which the burner is re-ignited as a pre-step of the step of performing the first tower switching damper cycle operation, and the step of performing the first tower switching damper cycle operation The operation control method of the regenerative combustion type exhaust gas purification apparatus according to claim 2, including a step of determining whether or not the set value is a temperature at which the burner is extinguished as a step. In the two-column heat storage combustion exhaust gas purification apparatus, in which the heat storage combustion exhaust gas purification apparatus is composed of a first tower and a second tower, the pattern switched during the tower switching second damper cycle operation is an inlet damper of the first tower. And the outlet damper is switched to the open state and the inlet damper and outlet damper of the second tower are switched to the closed state, and the inlet damper and outlet damper of the second tower are switched to the open state and the inlet of the first tower is switched The operation control method for a regenerative combustion exhaust gas purification apparatus according to claim 1, wherein the damper and the outlet damper are in a pattern 2 in which the damper is switched to a closed state. The heat storage combustion type exhaust gas purifying apparatus is a three-column type heat storage combustion type exhaust gas purifying apparatus comprising a first tower, a second tower, and a third tower, and a cold air intake damper is provided in the first tower, the second tower, and the third tower. The operation control of the regenerative combustion exhaust gas purifying apparatus according to claim 1, wherein the purge pipes communicating with each other are connected via a first tower purge damper, a second tower purge damper and a third tower purge damper, respectively. Method. In the three-column heat storage combustion type exhaust gas purifying apparatus, the pattern that is switched during the second damper cycle operation for switching the tower switches the inlet damper and outlet damper of the first tower to the open state, and the second tower and the third tower. Pattern 1 as a pattern in which the inlet damper and outlet damper of the second tower are switched to the closed state, the inlet damper and outlet damper of the second tower are switched to the opened state, and the inlet damper and outlet damper of the first tower and the inlet damper of the third tower are Pattern 2 as a pattern in which the outlet damper is switched to the closed state, the inlet damper and outlet damper of the third tower are switched to the open state, and the inlet damper and outlet damper of the first tower and the inlet damper and outlet damper of the second tower are closed. The operation control method of the regenerative combustion exhaust gas purification apparatus according to claim 7, wherein the pattern 3 is a pattern that switches to a state.