JP2015114056A - Gas treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress complication of gas treatment equipment and an increase in the cost thereof and furthermore to prevent heat damage to a waste exhaust heat recovery unit.SOLUTION: Gas treatment equipment is provided which includes a waste heat recovery unit 12 that introduces high temperature treated gas from a combustion chamber 3 through a recovery passage 13 with a recovery damper 13a interposed therein and causes the introduced treated gas to exchange heat with a heat medium for heat recovery. The gas treatment equipment has constitution in which: a cooling air passage 16 with a cooling damper 16a interposed therein is branched from a discharge side portion of a combustion air fan 5 in a combustion air passage 6, and is connected to the waste heat recovery unit 12; and the combustion air fan 5 is operated with the cooling damper 16a open, so that air an for combustion supplied from the combustion air fan 5 is supplied through the cooling air passage 16 to the waste heat recovery unit 12 as air ac for cooling.

Description

The present invention relates to a gas processing apparatus for processing a gas to be processed containing a volatile organic compound.
A gas processing fan that supplies a gas to be processed containing a volatile organic compound to the combustion chamber through the gas path to be processed, and a fuel to be processed by burning the fuel together with the combustion air supplied through the air path for combustion by the combustion air fan A high-temperature treated gas is introduced from the combustion chamber through a recovery path through which a volatile organic compound contained in the gas is thermally decomposed in the combustion chamber and a recovery damper is interposed. The present invention relates to a gas processing apparatus including a waste heat recovery device that recovers retained heat of an introduced processed gas by exchanging heat with a heat recovery heat medium.

  Conventionally, in this type of gas processing apparatus (see FIG. 7), when any abnormality occurs in the waste heat recovery unit 12, the recovery damper 13a in the recovery path 13 is closed to transfer the combustion chamber 3 to the waste heat recovery unit 12. The introduction of the high temperature treated gas G ′ is shut off, or the recovery damper 13 a in the recovery path 13 is closed and the escape damper 14 a is opened to release the high temperature processed gas G ′ in the combustion chamber 3 through the escape path 14 to the outside. Safety measures such as discharge were taken.

  Regardless of the implementation of these measures, if there is a concern that the situation of the waste heat recovery device 12 will be further deteriorated due to an unavoidable leak in the recovery damper 13a, the operation of the gas treatment device itself is performed. I was trying to stop.

  There is no suitable patent document showing the prior art.

  However, conventionally, even if the recovery damper 13a in the recovery path 13 is closed and the operation of the gas processing apparatus is stopped as described above, the waste heat recovery unit 12 that has been in operation until then has a large amount of high-temperature residual heat. Therefore, for example, if the waste heat boiler 12 is equipped with a waste heat boiler, the waste heat recovery unit 12 may be damaged due to high temperature residual heat, such as air blow damage of the waste heat boiler caused by high temperature residual heat. There was a fear.

  In addition, the combustion chamber 3 remains in a high temperature state and remains in a high pressure state for a while after the gas processing apparatus is stopped. However, the damper is not limited to the recovery damper 13a in the recovery path 13, and the damper is fully closed. Even so, there is a certain amount of leak (that is, an unavoidable leak), so that the high-temperature treated gas G ′ in the combustion chamber 3 leaks the closed recovery damper 13a in the recovery path 13 as described above and becomes abnormal. There was also a risk that the waste heat recovery unit 12 would be invaded and this would cause thermal damage to the waste heat recovery unit 12.

  In addition, in order to restore the waste heat recovery unit 12 in which an abnormality has occurred, it is necessary to inspect and repair the waste heat recovery unit 12, but the waste heat recovery unit 12 having high-temperature residual heat can be inspected and repaired by natural cooling. It takes a considerable amount of time to lower the temperature to a certain temperature. For this reason, there is a problem that it takes a considerable amount of time to restore the waste heat recovery unit 12 and restart the gas treatment operation.

  In view of this situation, the main problem of the present invention is to adopt the rational cooling configuration using the auxiliary equipment of the gas processing apparatus, effectively suppressing the above-mentioned problems while effectively suppressing the complexity of the apparatus and the increase in the apparatus cost. It is in the point to cancel.

The first characteristic configuration of the present invention relates to a gas processing apparatus,
A gas processing fan for supplying a gas to be treated containing a volatile organic compound to a combustion chamber through a gas passage to be treated;
A gas processing burner for burning a fuel together with combustion air supplied through a combustion air passage by a combustion air fan to thermally decompose a volatile organic compound contained in the gas to be processed in the combustion chamber;
A high-temperature treated gas is introduced from the combustion chamber through a collection path with a collection damper interposed, and the introduced treated gas is heat-exchanged with the heat recovery heat medium to recover the retained heat of the introduced treated gas. A gas treatment device comprising a waste heat recovery device,
A cooling air passage interposed with a cooling damper is branched from a discharge side portion of the combustion air fan in the combustion air passage and connected to the waste heat recovery device;
By operating the combustion air fan with the cooling damper opened, the combustion air supplied by the combustion air fan is supplied as cooling air to the waste heat recovery device through the cooling air passage. Thus, the waste heat recovery device is cooled.

  According to this configuration, by closing the cooling damper during normal operation, the combustion air fan is operated so that the combustion air is supplied to the gas treatment burner through the combustion air passage. Gas treatment in which the gas to be treated is supplied to the combustion chamber through the gas passage by the gas processing fan, and the volatile organic compound in the gas to be treated is pyrolyzed in the combustion chamber. Operation can be carried out as before.

  In parallel with this gas processing operation, by opening a recovery damper in the recovery path, high-temperature processed gas is introduced from the combustion chamber through the recovery path to the waste heat recovery unit, and the introduced processed gas is converted into waste heat. The waste heat recovery operation in which the heat retained in the introduced gas is recovered in the heat recovery heat medium by exchanging heat with the heat recovery heat medium in the recovery device can be performed as before.

  And in this gas processing operation and the accompanying waste heat recovery operation, when an abnormality occurs in the waste heat recovery device for some reason, as a countermeasure, the recovery damper in the recovery path is closed and the gas processing operation is stopped. By operating the combustion air fan with the cooling damper open, the combustion air supplied by the combustion air fan is supplied as cooling air to the waste heat recovery unit where the abnormality has occurred through the cooling air passage. Thus, a recovery device cooling operation for forcibly cooling the waste heat recovery device with the cooling air can be performed.

  That is, due to this cooling operation of the recovery unit, heat damage due to the high-temperature residual heat as described above of the waste heat recovery unit that has abnormally occurred, or the recovery damper with the high-temperature treated gas closed in the combustion chamber leaks and the abnormal generation is discarded. It is possible to effectively prevent thermal damage of the waste heat recovery device due to entering the heat recovery device.

  In addition, this recovery unit cooling operation significantly reduces the time required for the abnormal waste heat recovery unit that retains high-temperature residual heat to drop to a temperature that can be inspected and repaired compared to natural cooling as before. As a result, it is possible to effectively shorten the time required to restore the abnormal waste heat recovery unit and restart the gas processing operation.

  In addition, while using such a forced cooling system, the cooling air is supplied to the waste heat recovery device using the combustion air fan that is equipped as an accessory to the gas treatment device. Compared with the equipment that forcibly cools the waste heat recovery device, it is possible to effectively suppress the complexity of the device and the increase in the device cost.

The second characteristic configuration of the present invention relates to a gas processing apparatus,
A gas processing fan for supplying a gas to be treated containing a volatile organic compound to a combustion chamber through a gas passage to be treated;
A gas processing burner for burning a fuel together with combustion air supplied through a combustion air passage by a combustion air fan to thermally decompose a volatile organic compound contained in the gas to be processed in the combustion chamber;
A high-temperature treated gas is introduced from the combustion chamber through a collection path with a collection damper interposed, and the introduced treated gas is heat-exchanged with the heat recovery heat medium to recover the retained heat of the introduced treated gas. A gas treatment device comprising a waste heat recovery device,
An outside air introduction path with an outside air introduction damper interposed is connected to a suction side portion of the gas processing fan in the gas passage to be processed,
A cooling air passage interposed with a cooling damper is branched from a discharge side portion of the gas processing fan in the gas passage to be processed and connected to the waste heat recovery device;
By operating the gas processing fan with the outside air introduction damper and the cooling damper opened, outside air is introduced through the outside air introduction path by the gas processing fan, and the introduced outside air is used as cooling air. The gas processing fan supplies the waste heat recovery device through the cooling air passage to cool the waste heat recovery device.

  According to this configuration, the gas to be processed can be supplied to the combustion chamber through the gas path by the operation of the gas processing fan by closing the outside air introduction damper and the cooling damper at normal times. Thus, the gas processing operation for thermally decomposing volatile organic compounds in the gas to be processed supplied to the combustion chamber by the gas processing fan in the combustion chamber can be performed as before.

  In parallel with this gas processing operation, by opening a recovery damper in the recovery path, high-temperature processed gas is introduced from the combustion chamber through the recovery path to the waste heat recovery unit, and the introduced processed gas is converted into waste heat. The waste heat recovery operation in which the heat retained in the introduced gas is recovered in the heat recovery heat medium by exchanging heat with the heat recovery heat medium in the recovery device can be performed as before.

  And in this gas processing operation and the accompanying waste heat recovery operation, when an abnormality occurs in the waste heat recovery device for some reason, as a countermeasure, the recovery damper in the recovery path is closed and the gas processing operation is stopped. By operating the gas processing fan with the outside air introduction damper and the cooling damper opened, the outside air is introduced through the outside air introduction path by the gas processing fan, and the introduced outside air is used as cooling air for the gas processing fan. Thus, it is possible to perform a recovery device cooling operation in which the waste heat recovery device is supplied to the waste heat recovery device through the cooling air passage and the waste heat recovery device is forcibly cooled by the cooling air.

  That is, by this recovery device cooling operation, as in the first characteristic configuration, the heat damage caused by the high temperature residual heat of the waste heat recovery device in which the abnormality has occurred, or the recovery damper in which the high temperature treated gas in the combustion chamber is closed is removed. It is possible to effectively prevent thermal damage to the waste heat recovery unit due to leakage and entering the abnormal waste heat recovery unit.

  In addition, this recovery unit cooling operation significantly reduces the time required for the abnormal waste heat recovery unit that retains high-temperature residual heat to drop to a temperature that can be inspected and repaired compared to natural cooling as before. As a result, it is possible to effectively shorten the time required to restore the abnormal waste heat recovery unit and restart the gas processing operation.

  Moreover, while using such a forced cooling method, the cooling air is supplied to the waste heat recovery device using the gas processing fan installed as an accessory to the gas processing device. Compared with the equipment that forcibly cools the waste heat recovery device, it is possible to effectively suppress the complexity of the device and the increase in the device cost.

The third feature configuration of the present invention specifies an embodiment suitable for the implementation of the first or second feature configuration.
The cooling air passage is opposite to the flow direction of the high-temperature treated gas from the combustion chamber with respect to the internal air passage of the waste heat recovery device that vents the high-temperature treated gas from the combustion chamber through the recovery passage. The cooling air is ventilated in the direction of air flow and is connected to the waste heat recovery device.

  According to this configuration, in the waste heat recovery operation in which the high-temperature treated gas from the combustion chamber is passed through the recovery passage to the internal ventilation passage of the waste heat recovery device to recover the retained heat of the introduced treated gas, The outlet side portion of the internal ventilation path that is cooler than the inlet side portion of the internal ventilation path in the waste heat recovery apparatus on the side where the high temperature treated gas flows in (i.e., the treated gas whose retained heat has been recovered and the temperature has decreased) Contrary to this, the cooling air is connected in the same direction as the high-temperature treated gas from the combustion chamber, and the internal air passage of the waste heat recovery unit Compared to adopting a form to ventilate, it is possible to effectively reduce the heat resistance required for the material for forming the cooling air passage and the heat insulation required for the heat insulating means provided for the cooling air passage. This makes it possible to more effectively suppress the increase in device cost. .

The fourth feature configuration of the present invention specifies an embodiment suitable for the implementation of the third feature configuration.
An escape path is provided to guide high-temperature treated gas from a portion closer to the combustion chamber than the recovery damper in the recovery path or from the combustion chamber to the exhaust path, and an escape damper is provided to open and close the escape path. In the point.

  According to this configuration, the cooling air from the cooling air passage is supplied to the internal air passage of the waste heat recovery device in the direction opposite to the high temperature treated gas introduced from the combustion chamber to the waste heat recovery device through the recovery passage. In the cooling operation of the collector to ventilate, by opening the recovery damper and the escape damper in the recovery path, it passes through the internal ventilation path of the waste heat recovery unit in the direction opposite to the high-temperature treated gas from the combustion chamber. The cooled cooling air (that is, the cooling air after cooling the waste heat recovery device) is directed to the escape passage with the recovery passage flowing back toward the combustion chamber, and discharged to the exhaust passage through the escape passage. As a result, a sufficient amount of cooling air can be smoothly ventilated to the internal ventilation path of the waste heat recovery unit in which the abnormality has occurred.

  Note that even if the recovery chamber recovery damper is opened while the combustion chamber is still hot in this recovery device cooling operation, the high temperature treated gas in the combustion chamber will enter the waste heat recovery device through the recovery passage. This can be reliably prevented by the reverse flow of the cooling air toward the combustion chamber in the passage, and as a result, the high temperature treated gas in the combustion chamber can enter the waste heat recovery device in which an abnormality has occurred. Thermal damage can be reliably prevented.

  In addition, this escape path is used to control the temperature of the combustion chamber during the gas treatment operation and the air guide path used when exhausting the high temperature treated gas in the combustion chamber to the exhaust path when an abnormality occurs in the waste heat recovery unit. It can also be used as a wind guide path when part of the high-temperature treated gas in the combustion chamber is discharged to the exhaust path, and this combined use effectively suppresses the complexity of the equipment and the increase in equipment cost. You can also

The fifth feature configuration of the present invention specifies an embodiment suitable for the implementation of the third or fourth feature configuration.
A bypass path for the cooling damper is provided in the cooling air path,
The bypass is provided with check means for allowing an air flow toward the waste heat recovery unit and preventing a reverse air flow.

  According to this configuration, even in a situation where it is not necessary to perform a collector cooling operation for opening the cooling damper, such as when performing a device cooling operation for cooling the combustion chamber by introducing outside air following the stop of the gas processing operation, When the recovery damper is in the closed state, a small amount of cooling air (that is, the combustion air supplied by the combustion air fan in the first feature configuration, or the second In the characteristic configuration, the supply pressure of the cooling air to the closed recovery damper (that is, for combustion) is supplied to the waste heat recovery device through the bypass passage through the outside air introduction passage and the outside air sucked by the gas processing fan. Discharge pressure of the air fan or gas processing fan) can be applied to the combustion chamber, so that even if the combustion chamber is hot, the high temperature treated gas and high temperature air in the combustion chamber It is possible to reliably prevent the recovery damper in the closed state from leaking and entering the waste heat recovery device. In this respect, the gas treatment device is more excellent for preventing thermal damage of the waste heat recovery device. can do.

The sixth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to fifth characteristic configurations,
A gas processing operation in which a gas to be processed is supplied to the combustion chamber through the gas path to be processed by the gas processing fan, and a volatile organic compound contained in the gas to be processed is thermally decomposed in the combustion chamber; Providing a control means for switching to a recovery device cooling operation for cooling the waste heat recovery device by supplying the cooling air to the waste heat recovery device through a cooling air passage;
When an abnormality occurs in the waste heat recovery device during the gas processing operation, the control means automatically stops the gas processing operation based on the abnormality detection information and automatically starts the recovery device cooling operation. It is in the point which is made into composition.

  According to this configuration, when an abnormality occurs in the waste heat recovery unit, switching from the gas processing operation to the recovery unit cooling operation is automatically performed by the control means. In comparison, the heat damage of the waste heat recovery apparatus can be prevented more reliably, and the operation management of the apparatus becomes easier.

The figure which shows the gas processing driving | operation of the gas processing apparatus in 1st Embodiment. The figure which shows the collector cooling operation of the gas processing apparatus in 1st Embodiment. The figure which shows the apparatus cooling operation of the gas treatment apparatus in 1st Embodiment. The figure which shows the gas processing driving | operation of the gas processing apparatus in 2nd Embodiment. The figure which shows the collector cooling operation of the gas processing apparatus in 2nd Embodiment. The figure which shows the apparatus cooling operation of the gas processing apparatus in 2nd Embodiment. Diagram showing a conventional gas treatment device

[First Embodiment]
FIG. 1 shows a heat storage type gas processing apparatus. In this gas processing apparatus, a gas to be processed G discharged from a production line such as a painting factory, a printing factory or a semiconductor factory is passed through a gas processing fan 2 by a gas processing fan 1. A gas processing operation is performed in which a volatile organic compound such as a solvent vapor contained in the gas to be treated G is pyrolyzed in the combustion chamber 3 by being supplied to the combustion chamber 3.

  In the combustion chamber 3, the fuel f supplied through the fuel passage 4 is combusted in the combustion chamber 3 together with the combustion air an (generally outside air) supplied through the combustion air passage 6 by the combustion air fan 5. A treatment burner 7 is provided, and the gas treatment burner 7 burns a volatile organic compound in the gas G to be treated in an auxiliary combustion state or a self-combustion state and performs thermal decomposition treatment.

  In addition, the combustion chamber 3 is connected to one end of each of the first and second heat storage chambers 9a and 9b containing the breathable heat storage material layer 8, and the first heat storage chamber 9a has a gas to be treated. The state where the passage 2 is communicated with the other end of the first heat storage chamber 9a and the first heat storage chamber 9a is used as the inlet side heat storage chamber, and the exhaust passage 10 to the outside is communicated with the other end of the first heat storage chamber 9a. A first poppet valve 11a that switches between a state in which one heat storage chamber 9a is used as an outlet side heat storage chamber is provided.

  Similarly, with respect to the second heat storage chamber 9b, a state in which the gas path 2 to be treated is communicated with the other end of the second heat storage chamber 9b and the second heat storage chamber 9b is used as an inlet side heat storage chamber, and an exhaust path to the outside 10 is connected to the other end of the second heat storage chamber 9b, and is equipped with a second poppet valve 11b that switches between the state where the second heat storage chamber 9b is the outlet side heat storage chamber.

  That is, by the switching operation of the first and second poppet valves 11a and 11b, as shown by the solid arrows in FIG. 1, the gas to be treated G is set in the first heat storage chamber 9a using the first heat storage chamber 9a as the inlet heat storage chamber. In parallel with passing through the heat storage material layer 8 and guiding it to the combustion chamber 3, the high temperature treated gas G 'obtained by pyrolyzing the volatile organic compound in the combustion chamber 3 is converted into the heat storage material layer 8 of the second heat storage chamber 9b. As shown by the broken line arrow in FIG. 1, the state where the gas is passed through the exhaust passage 10 and the second heat storage chamber 9b as the inlet side heat storage chamber and the gas G to be processed as the heat storage in the second heat storage chamber 9b. In parallel with the passage of the material layer 8 to the combustion chamber 3, the high temperature treated gas G ′ obtained by thermally decomposing the volatile organic compound in the combustion chamber 3 is converted into the heat storage material layer 8 of the first heat storage chamber 9 a. The gas path is alternately switched to the state of passing through and leading to the exhaust path 10.

  That is, by repeating this alternate switching in the gas processing operation, the heat storage material layer 8 of the outlet side heat storage chamber which has stored heat by passing the high-temperature processed gas G ′ in the previous step is used as the heat storage of the inlet side heat storage chamber in the next step. The treated gas G is preheated by allowing the treated gas G to pass through the heat storage material layer 8 in the heat storage state as the material layer 8, whereby the preheated treated gas G is continuously supplied to the combustion chamber 3. In this way, the required amount of combustion of the gas processing burner 7 is reduced.

  Reference numeral 12 denotes a waste heat boiler as a waste heat recovery unit. In this waste heat boiler, as a waste heat recovery operation, a part amount of the high-temperature treated gas G ′ from the combustion chamber 3 in the gas treatment operation state is passed through the recovery path 13. By introducing, the introduced treated gas G ′ is heat exchanged with water w as a heat recovery heat medium, thereby collecting the retained heat of the high temperature treated gas G ′ introduced from the combustion chamber 3, Heating water w as a heat recovery heat medium with the recovered heat generates hot water or water vapor used for various purposes.

  A recovery damper 13a is interposed in the recovery path 13, and when the waste heat recovery operation by the waste heat boiler 12 is not performed or when the waste heat boiler 12 is out of order, the recovery damper 13a is closed. The introduction of the high-temperature treated gas G ′ to the waste heat boiler 12 is shut off.

  Reference numeral 14 denotes an escape path that branches from a position closer to the combustion chamber 3 than the recovery damper 13a in the recovery path 13 and is connected to the exhaust path 10, and the escape path 14 is provided with an escape damper 14a.

  That is, when the combustion chamber 3 tends to overheat in the gas processing operation, the escape damper 14a is opened and a part of the high temperature treated gas G in the combustion chamber 3 is discharged to the outside through the escape passage 14 and the exhaust passage 10. Thus, the combustion chamber 3 is maintained at an appropriate temperature state.

  Reference numeral 15 denotes the treated gas G ′ (that is, the treated gas whose temperature has been lowered by heat exchange with the water w as a heat recovery heat medium) that has passed through the in-vessel ventilation path 12 a of the waste heat boiler 12 to the exhaust path 10. This is a recovery system exhaust path that discharges, and a recovery system exhaust damper 15a that is opened only during waste heat recovery operation is interposed in the recovery system exhaust path 15.

  Further, a cooling air passage 16 is provided from a discharge side portion of the combustion air fan 5 in the combustion air passage 6 upstream of the combustion air valve 6a for intermittently supplying the combustion air an to the gas processing burner 7. The cooling air passage 16 is branched and connected to the waste heat boiler 12 by connecting to the upstream side of the recovery system exhaust damper 15a in the recovery system exhaust passage 15, and the cooling air passage 16 includes a cooling air passage 16 for cooling. A damper 16a is interposed.

  The cooling air passage 16 is provided with a small-diameter bypass passage 17 for the cooling damper 16a. The bypass passage 17 allows only the air flow toward the waste heat boiler 12 and prevents the reverse air flow. A check valve 17a is interposed.

  Reference numeral 18 denotes a controller for switching the first and second poppet valves 9a and 9b in the gas processing operation and opening / closing the dampers and valves. The controller 18 is a waste heat recovery operation accompanying the gas processing operation. When an abnormality is detected in the waste heat boiler 12 (for example, a serious water level drop in the waste heat boiler 12 in this example), the gas processing operation shown in FIG. 1 is automatically stopped based on the detected information and shown in FIG. The collector cooling operation starts automatically.

  Specifically, in this recovery device cooling operation, the controller 18 closes the fuel valve 4a of the fuel passage 4 and the combustion air valve 6a of the combustion air passage 6 to close the gas processing burner 7 as shown in FIG. In a state where the combustion operation is stopped and the supply of the gas G to be processed by the gas processing fan 1 is stopped to stop the gas processing operation, the cooling damper 16a is opened and the recovery system exhaust damper 15a is closed. The combustion air fan 5 is operated.

  That is, in this recovery device cooling operation, the combustion air valve 6a is closed, the cooling damper 16a is opened, and the combustion air fan 5 is operated with the recovery system exhaust damper 15a closed, thereby The flow direction of the high-temperature treated gas G ′ from the combustion chamber 3 through the cooling air passage 16 through the cooling air passage 16 to the internal air passage 12a of the waste heat boiler 12 as the cooling air ac supplied by the air fan 5 Ventilation is performed in the opposite direction to the above, whereby the abnormally generated waste heat boiler 12 is forcibly cooled to prevent thermal damage to the waste heat boiler 12.

  In this recovery device cooling operation, the controller 18 opens both the recovery damper 13a in the recovery passage 13 and the escape damper 14a in the escape passage 14, and thereby opens the internal ventilation passage 12a of the waste heat boiler 12. The passing cooling air ac (that is, the cooling air after cooling the waste heat boiler 12) is caused to flow backward to the recovery path 13 and led to the escape path 14 and smoothly through the escape path 14 to the exhaust path 10 Spill into.

  In each figure, the reference numerals indicating the dampers and valves indicate the open / closed states of the dampers and valves in each operation in parentheses.

  On the other hand, FIG. 3 shows an apparatus cooling operation that is automatically executed by the controller 8 following the normal stop of the gas processing operation when the gas processing operation is normally stopped. The gas processing damper 2a in the gas path 2 to be processed is closed, and the outside air in the external air introduction path 19 connected to the suction side portion of the gas processing fan 1 in the gas path 2 to be processed downstream of the gas processing damper 2a. By operating the gas processing fan 1 with the introduction damper 19a opened, the outside air ao is introduced into the gas passage 2 to be treated through the outside air introduction passage 19, and the introduced outside air ao is supplied to the first and second poppet valves. 11a and 11b are supplied to the combustion chamber 3 through the gas passage 2 to be processed in a state accompanied by the alternate switching between the inlet side heat storage chamber and the outlet side heat storage chamber as described above. , The combustion chamber 3 and the heat storage chambers 9a after gassing operation, and 9b to cool.

  In this apparatus cooling operation, the recovery damper 13a, the escape damper 14a, the recovery system exhaust damper 15a, and the cooling damper 16a are all closed.

  In this device cooling operation, the recovery damper 13a in the recovery path 13 is closed, whereas the fuel valve 4a in the fuel path 4 is closed and the combustion operation of the gas processing burner 7 is stopped. By operating the air fan 5, a very small amount of the combustion air an supplied as the cooling air ac to the cooling air passage 16 side is passed through the bypass passage 17 of the cooling air passage 16 and installed in the waste heat boiler 12. For recovery in a state in which the supply pressure of the combustion air an (cooling air) is closed with the internal ventilation passage 12a being supplied in a direction opposite to the direction of ventilation of the high-temperature treated gas from the combustion chamber 3. It acts on the damper 13a in the direction of the combustion chamber 3.

  That is, with the check valve 17a in the bypass passage 17 reliably preventing the backflow, the supply pressure of the combustion air an is thus applied to the recovery damper 13a in the closed state toward the combustion chamber 3, In the apparatus cooling operation, the high-temperature treated gas and high-temperature air that are still delivered from the high-temperature combustion chamber 3 are prevented from leaking through the closed recovery damper 13a and entering the waste heat boiler 12.

  In this apparatus cooling operation, the combustion air valve 6a may be in a closed state or an open state.

  Further, by providing this bypass passage 17, not only the apparatus cooling operation but also the combustion air fan 5 is operated with the recovery damper 13a and the recovery system exhaust damper 15a closed (for example, the waste heat recovery operation is performed). When the gas treatment operation is not accompanied, the combustion chamber 3 is always closed to the recovery damper 13a in the closed state with the supply pressure of the combustion air an closed with the check valve 17a in the bypass passage 17 reliably blocking the backflow. By acting in the direction, gas leakage to the waste heat boiler side in the recovery damper 13a in the closed state can be prevented.

[Second Embodiment]
FIG. 4 shows a regenerative gas processing apparatus according to the second embodiment. In this gas processing apparatus, the cooling air passage 16 is connected to the combustion air fan 5 in the combustion air path 6 as in the gas processing apparatus according to the first embodiment. Instead of branching from the discharge side portion, the cooling air passage 16 is branched from the discharge side portion of the gas processing fan 1 in the gas passage 2 to be processed and connected to the waste heat boiler 12 as a waste heat recovery unit. .

  Specifically, the outside air introduction path 19 with the outside air introduction damper 19a interposed therebetween is connected to the suction side portion of the gas processing fan 1 in the gas processing target path 2 on the downstream side of the gas processing damper 2a and cooled. The cooling air passage 16 with the use of the damper 16a is branched from the discharge side portion of the gas processing fan 1 in the gas passage 2 to be processed. The cooling air passage 16 is connected to the recovery system exhaust damper 15a in the recovery system exhaust passage 15. Is connected to the waste heat boiler 12 by connecting to the upstream side of the boiler.

  In the gas treatment operation, the outside air introduction damper 19a and the cooling damper 16a are closed, and the gas to be treated G is supplied to the combustion chamber 3 by the gas treatment fan 1 through the gas passage 2 to be treated. As in the gas processing apparatus of the embodiment, as shown by the solid line arrow in FIG. 4, the first heat storage chamber 9a is used as the inlet side heat storage chamber, and the gas G to be processed is passed through the heat storage material layer 8 of the first heat storage chamber 9a. In parallel with this, the high-temperature treated gas G ′ obtained by thermally decomposing the volatile organic compound in the combustion chamber 3 passes through the heat storage material layer 8 of the second heat storage chamber 9 b and is guided to the exhaust passage 10. On the contrary, as shown by the dashed arrow in FIG. 4, the gas to be treated G is allowed to pass through the heat storage material layer 8 of the second heat storage chamber 9b using the second heat storage chamber 9b as the inlet side heat storage chamber, and the combustion chamber 3 In parallel with this, volatile organic compounds are pyrolyzed in the combustion chamber 3. In a state in which the hot treated gas G 'that sense passed through a heat storage material layer 8 of the first regenerator 9a directs the exhaust path 10 to implement by switching the gas path alternately.

  When an abnormality (for example, a serious water level drop in the waste heat boiler 12 in this example) is detected in the waste heat boiler 12 in the waste heat recovery operation associated with the gas treatment operation, the controller 18 performs a diagram based on the detected information. The gas processing operation shown in FIG. 4 is automatically stopped, and the recovery device cooling operation shown in FIG. 5 is automatically started.

  Specifically, in this recovery device cooling operation, as shown in FIG. 5, the controller 18 closes the fuel valve 4a of the fuel passage 4 and stops the combustion air fan 5 to perform the combustion operation of the gas processing burner 7. In a state where the gas processing damper 2a of the gas passage 2 to be processed is closed and the gas processing operation is stopped, the outside air introduction damper 19a and the cooling damper 16a are opened and the recovery system exhaust damper 15a is closed. Then, the gas processing fan 1 is operated.

  That is, in this recovery device cooling operation, the gas processing fan 1 is operated with the outside air introduction damper 19a and the cooling damper 16a opened, and the gas processing damper 2a and the recovery system exhaust damper 15a closed. The outside air ao is introduced by the gas processing fan 1 through the outside air introduction path 19, and the introduced outside air ao is used as cooling air ac through the cooling air path 16 by the gas processing fan 1 and the internal ventilation path 12 a of the waste heat boiler 12. On the other hand, the high-temperature treated gas G ′ from the combustion chamber 3 is ventilated in a direction opposite to that of the high-temperature treated gas G ′, thereby forcibly cooling the waste heat boiler 12 in which abnormality has occurred.

  Further, in this recovery device cooling operation, the controller 18 opens both the recovery damper 13a in the recovery path 13 and the escape damper 14a in the escape path 14 in the same manner as in the gas processing apparatus of the first embodiment. The cooling air ac (that is, the cooling air after cooling the waste heat boiler 12) that has passed through the in-vessel ventilation path 12 a of the waste heat boiler 12 is returned to the escape path 14 in a state where it flows backward to the recovery path 13. It is guided and smoothly flows out to the exhaust passage 10 through the escape passage 14.

  As with the gas processing apparatus of the first embodiment, the cooling air passage 16 is provided with a small-diameter bypass passage 17 for the cooling damper 16a, and this bypass passage 17 allows only air flow toward the waste heat boiler 12. Thus, a check valve 17a for preventing the reverse air flow is interposed.

  FIG. 6 shows a device cooling operation that is automatically executed by the controller 8 following a normal stop of the gas processing operation when the gas processing operation is normally stopped. In this device cooling operation, the controller 8 By operating the gas processing fan 1 while the cooling damper 16a is kept closed while the outside damper 2a is closed and the outside air introduction damper 19 is closed, the outside air is introduced into the gas path 2 to be treated through the outside air introduction path 19. ao is introduced, and the introduced outside air ao is subjected to the switching operation of the first and second poppet valves 11a and 11b, and the gas path 2 to be treated 2 is alternately switched between the inlet side heat storage chamber and the outlet side heat storage chamber as described above. Through this, the combustion chamber 3 and the heat storage chambers 9a and 9b after the gas processing operation are cooled.

  Similar to the gas processing apparatus of the first embodiment, the recovery damper 13a, the escape damper 14a, the recovery exhaust damper 15a, and the cooling damper 16a are all closed in this apparatus cooling operation.

  In this apparatus cooling operation, a very small amount of introduced outside air ao, which is supplied as a cooling air ac to the cooling air passage 16 by the operation of the gas processing fan 1, passes through the bypass passage 17 of the cooling air passage 16. Supply the air to the internal ventilation path 12a of the waste heat boiler 12 in a direction opposite to the direction of the high-temperature treated gas from the combustion chamber 3, and close the supply pressure of the outside air ao (cooling air). The recovery damper 13a in the state is caused to act in the direction of the combustion chamber 3, so that the high-temperature treated gas and high-temperature air that are still delivered from the high-temperature combustion chamber 3 in the apparatus cooling operation leak the closed recovery damper 13a. Thus, the waste heat boiler 12 is prevented from entering.

[Another embodiment]
Another embodiment of the present invention will be listed below.

  In the first and second embodiments, the cooling air passage 16 is either the discharge side portion of the combustion air fan 5 in the combustion air passage 6 or the discharge side portion of the gas processing fan 1 in the gas passage 2 to be processed. In the embodiment, the first cooling air passage 16 is branched from the discharge side portion of the combustion air fan 5 in the combustion air passage 6 in the embodiment in which the first and second embodiments are performed in parallel. At the same time, the second cooling air passage 16 is branched from the discharge side portion of the gas processing fan 1 in the gas passage 2 to be treated, and both the first and second cooling air passages 16 are disposed in the waste heat recovery unit. 12 may be adopted.

  In the first and second embodiments, the gas processing apparatus including the waste heat boiler is shown as the waste heat recovery unit 12, but the waste heat recovery unit 12 is not limited to the waste heat boiler, and is introduced from the combustion chamber 3 through the recovery path 13. As long as the high temperature treated gas G ′ can be heat exchanged with the heat recovery heat medium w, any heat recovery heat medium w may be used, and the heat recovery heat medium w is not limited to water. A liquid heat medium or a gas heat medium can be employed.

  In the first and second embodiments, the cooling air ac from the cooling air passage 16 is used as the ventilation direction of the high-temperature treated gas G ′ from the combustion chamber 3 with respect to the internal air passage 12 a of the waste heat recovery device 12. Shows an example in which the cooling air passage 16 is connected to the waste heat recovery device 12 in a state of passing in the reverse ventilation direction. However, depending on the case, the internal air passage 12a of the waste heat recovery device 12 may be cooled. The cooling air path 16 is connected to the waste heat recovery unit 12 in such a state that the cooling air ac from the cooling air path 16 is passed in the same ventilation direction as that of the high-temperature treated gas G ′ from the combustion chamber 3. Also good.

  Further, in that case, the cooling air ac that has passed through the internal ventilation path 12a of the waste heat recovery device 12 is similar to the high-temperature treated gas G ′ that has passed through the internal ventilation path 12a of the waste heat recovery device 12. What is necessary is just to discharge | emit through the recovery system exhaust path 15 connected to the waste heat recovery device 12, etc.

  A bypass passage 17 for the cooling damper 16a is provided in the cooling air passage 16, and only air flow toward the waste heat recovery device 12 is allowed in the bypass passage 17 to prevent reverse air flow 17a. In this way, the air pressure directed toward the combustion chamber 3 is applied to the closed recovery damper 13a to prevent the closed recovery damper 13a from leaking toward the waste heat recovery device 12 side. The cooling air passage 16 is discarded so that the cooling air ac is passed through the internal air passage 12a of the waste heat recovery unit 12 in a direction opposite to that of the high-temperature treated gas G ′ from the combustion chamber 3. Not only when connected to the heat recovery unit 12, the cooling air passage 16 is made to pass the cooling air ac in the same ventilation direction as that of the high-temperature treated gas G ′ from the combustion chamber 3, and the waste air is recovered from the cooling air passage 16. When connecting to vessel 12 It can be adopted.

  That is, in any case, the internal ventilation passage 12a of the waste heat recovery device 12 is opened only to the bypass passage 17 of the cooling air passage 16 by closing the recovery damper 13a and other dampers. Then, a small amount of supply air (a small amount of cooling air ac) from the combustion air fan 5 or the gas processing fan 1 is supplied to the internal ventilation path 12a of the waste heat recovery unit 12 through the bypass path 17. The air supply pressure can be applied to the recovery damper 13a in the closed state toward the combustion chamber 3 to prevent the closed recovery damper 13a from leaking toward the waste heat recovery device 12 side.

  The present invention is not limited to a gas processing apparatus of a type that performs a gas processing operation while sequentially switching the ventilation direction of the gas G to be processed with respect to the combustion chamber 3 as shown in the first and second embodiments described above. 3 is also applicable to a gas processing apparatus that performs a gas processing operation while supplying the gas G to be processed with a constant ventilation direction.

  The gas processing apparatus according to the present invention can be used to thermally decompose volatile organic compounds contained in various gases to be processed generated in various fields.

G Gas to be treated 2 Gas path to be treated 3 Combustion chamber 1 Gas processing fan 5 Combustion air fan 6 Combustion air path an Combustion air f Fuel 7 Gas treatment burner 13a Recovery damper 13 Recovery path G 'Treated gas w Heat recovery medium 12 Waste heat recovery unit 16a Cooling damper 16 Cooling air path ac Cooling air 19a Outside air introduction damper 19 Outside air introduction path ao Outside air 12a Inside ventilation path 14 Escape path 14a Escape damper 17 Bypass path 17a Check means 18 Control means

Claims (6)

A gas processing fan for supplying a gas to be treated containing a volatile organic compound to a combustion chamber through a gas passage to be treated;
A gas processing burner for burning a fuel together with combustion air supplied through a combustion air passage by a combustion air fan to thermally decompose a volatile organic compound contained in the gas to be processed in the combustion chamber;
A high-temperature treated gas is introduced from the combustion chamber through a collection path with a collection damper interposed, and the introduced treated gas is heat-exchanged with the heat recovery heat medium to recover the retained heat of the introduced treated gas. A gas treatment device comprising a waste heat recovery device,
A cooling air passage interposed with a cooling damper is branched from a discharge side portion of the combustion air fan in the combustion air passage and connected to the waste heat recovery device;
By operating the combustion air fan with the cooling damper opened, the combustion air supplied by the combustion air fan is supplied as cooling air to the waste heat recovery device through the cooling air passage. A gas processing apparatus configured to cool the waste heat recovery unit. A gas processing fan for supplying a gas to be treated containing a volatile organic compound to a combustion chamber through a gas passage to be treated;
A gas processing burner for burning a fuel together with combustion air supplied through a combustion air passage by a combustion air fan to thermally decompose a volatile organic compound contained in the gas to be processed in the combustion chamber;
A high-temperature treated gas is introduced from the combustion chamber through a collection path with a collection damper interposed, and the introduced treated gas is heat-exchanged with the heat recovery heat medium to recover the retained heat of the introduced treated gas. A combustion gas treatment device comprising a waste heat recovery device,
An outside air introduction path with an outside air introduction damper interposed is connected to a suction side portion of the gas processing fan in the gas passage to be processed,
A cooling air passage interposed with a cooling damper is branched from a discharge side portion of the gas processing fan in the gas passage to be processed and connected to the waste heat recovery device;
By operating the gas processing fan with the outside air introduction damper and the cooling damper opened, outside air is introduced through the outside air introduction path by the gas processing fan, and the introduced outside air is used as cooling air. A gas processing apparatus configured to cool the waste heat recovery unit by supplying the waste heat recovery unit through the cooling air passage with the gas processing fan.   The cooling air passage is opposite to the flow direction of the high-temperature treated gas from the combustion chamber with respect to the internal air passage of the waste heat recovery device that vents the high-temperature treated gas from the combustion chamber through the recovery passage. The gas processing apparatus according to claim 1, wherein the cooling air is ventilated in the direction of air flow and is connected to the waste heat recovery unit.   An escape path is provided to guide high-temperature treated gas from a portion closer to the combustion chamber than the recovery damper in the recovery path or from the combustion chamber to the exhaust path, and an escape damper is provided to open and close the escape path. The gas processing apparatus according to claim 3. A bypass path for the cooling damper is provided in the cooling air path,
The gas processing apparatus according to claim 3 or 4, wherein a check means for allowing an air flow toward the waste heat recovery unit and preventing a reverse air flow is provided in the bypass passage. A gas processing operation in which a gas to be processed is supplied to the combustion chamber through the gas path to be processed by the gas processing fan, and a volatile organic compound contained in the gas to be processed is thermally decomposed in the combustion chamber; Providing a control means for switching to a recovery device cooling operation for cooling the waste heat recovery device by supplying the cooling air to the waste heat recovery device through a cooling air passage;
When an abnormality occurs in the waste heat recovery device during the gas processing operation, the control means automatically stops the gas processing operation based on the abnormality detection information and automatically starts the recovery device cooling operation. The gas processing apparatus according to claim 1, wherein the gas processing apparatus is configured.

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