JP5131574B2 - Exhaust gas purification device and temperature control method thereof - Google Patents

Description

  The present invention relates to an exhaust gas purifying apparatus for purifying exhaust gas containing flammable harmful components and a temperature control method thereof.

  Conventionally, as described in Japanese Patent Application Laid-Open No. 2004-77017, volatile organic compounds (VOC) generated from adhesive use / printing / painting / organic solvent cleaning facilities, chemical factories, etc. An exhaust gas purification apparatus is used for purification treatment of exhaust gas containing a flammable toxic component.

  The exhaust gas purifying apparatus includes, for example, a plurality of heat storage chambers having an air supply port / exhaust port to which a pair of air supply / exhaust valves are attached and a heat storage body. Combustion chambers communicated above the heat storage chambers. In this heat storage combustion type exhaust gas purifying apparatus, the exhaust gas purification processing operation is performed by switching and operating the exhaust gas supply / exhaust by the supply / exhaust valve of the heat storage chamber.

  From the viewpoint of effective use of the exhaust gas purification device and space saving in the factory, it is desirable to connect to one (one) of the heat storage combustion type exhaust gas purification device as described above. . In this way, when a plurality of exhaust gas generation sources are connected to one exhaust gas purification device, the temperature of the combustion chamber of the exhaust gas purification device may decrease, and the exhaust gas exhaust temperature may increase abnormally. There was a problem. This problem is likely to occur when the exhaust gas is in a low air volume / high concentration state. If the temperature of the combustion chamber is abnormally lowered, VOC in the exhaust gas cannot be decomposed, and it is necessary to stop the exhaust gas purification treatment operation, which is a problem.

  An object of the present invention is to provide an exhaust gas purification apparatus and a temperature control method thereof that can perform appropriate purification processing operation by preventing a decrease in combustion chamber temperature and an abnormal increase in exhaust gas exhaust temperature.

In order to achieve the above object, a first invention of the present invention is an exhaust gas purifying device for purifying exhaust gas containing a flammable toxic component, each of which has a heat storage body and a set of air supply A plurality of heat storage chambers provided with openings / exhaust ports, a combustion chamber formed in communication above the plurality of heat storage chambers, and a heat storage chamber attached to each air supply / exhaust port of the heat storage chamber Exhaust / intake valve for switching between intake and exhaust, a heating burner provided in the combustion chamber, a heat exhaust damper for exhausting excess heat from the combustion chamber, and ignition / extinguishing of the heating burner based on the combustion chamber temperature And a control means for controlling the temperature of the combustion chamber so that the combustion chamber temperature becomes a set value (SP) by adjusting the opening degree of the heat exhaust damper, and a combustion chamber temperature sensor attached to the combustion chamber for detecting the combustion chamber temperature, Inlet air temperature attached to each air supply / exhaust port of the heat storage chamber Anda exhaust gas temperature sensor for detecting the intake air temperature sensor and the exhaust temperature detecting and controlling means combustion before reaching the combustion chamber by heating to above its own fuel temperature level when the exhaust gas passes through the regenerator It is determined whether or not it is early combustion, and when it is determined that it is early combustion, an early combustion countermeasure operation is performed that forcibly opens the heat exhaust damper and extinguishes the heating burner. The early combustion countermeasure operation is canceled, and the control means is configured such that the combustion chamber temperature (t1), the supply air temperature (t2) and the exhaust gas temperature (t3) detected by the combustion chamber temperature sensor, the intake air temperature sensor, and the exhaust gas temperature sensor, respectively, When both (a) t1 ≦ early combustion confirmation SP and (b) t3−t2 ≧ early combustion confirmation temperature difference SP are satisfied, it is determined that early combustion has occurred, and (c) t1 ≧ early combustion release confirmation SP, ( d) When at least one of the conditions of t3−t2 ≦ early combustion release confirmation temperature difference SP is satisfied, it is determined that it is not early combustion .
In the present invention configured as described above, the control means determines whether or not the early combustion in which the exhaust gas is heated to a temperature higher than the self-combustion temperature and combusts before reaching the combustion chamber when passing through the heat storage body. When it is determined that early combustion is performed, an early combustion countermeasure operation for forcibly opening the heat discharge damper and extinguishing the heating burner is executed, and when it is determined that early combustion is not performed thereafter, the early combustion countermeasure operation is canceled. It is possible to prevent a decrease in the combustion chamber temperature and an abnormal increase in the exhaust gas temperature caused by the early combustion, and thus an appropriate purification treatment operation can be performed. Furthermore, according to the present invention, the control means can accurately and easily determine early combustion based on the combustion chamber temperature (t1), the supply air temperature (t2), and the exhaust gas temperature (t3). Based on the room temperature (t1) or the supply air temperature (t2) / exhaust temperature (t3), it can be determined accurately and easily that the combustion is not early combustion.

A second aspect of the present invention is an exhaust gas purifying device for purifying exhaust gas containing a flammable toxic component, each of which has a plurality of heat storage bodies and a set of air supply / exhaust ports. The heat storage chamber, the combustion chamber formed in communication above the plurality of heat storage chambers, and the exhaust for switching the intake and exhaust to the heat storage chamber attached to each of the intake and exhaust ports of the heat storage chamber・ Intake valve, heating burner installed in the combustion chamber, heat exhaust damper that discharges excess heat from the combustion chamber, and based on the combustion chamber temperature, the heating burner is ignited and extinguished, and the opening of the heat exhaust damper The control means for controlling the temperature so that the combustion chamber temperature becomes the set value (SP), the combustion chamber temperature sensor attached to the combustion chamber for detecting the combustion chamber temperature, and the heat storage chamber temperature attached to the heat storage chamber. has a heat storage chamber temperature sensor to be detected, the control means When exhaust gas passes through the heat accumulator, it is determined whether it is early combustion that rises above the self-combustion temperature and burns before reaching the combustion chamber, and when it is determined early combustion, the heat exhaust damper is forcibly opened. At the same time, an early combustion countermeasure operation for extinguishing the heating burner is executed, and if it is determined that early combustion is not performed thereafter, the early combustion countermeasure operation is canceled, and the control means is detected by the combustion chamber temperature sensor and the heat storage chamber temperature sensor, respectively. When the combustion chamber temperature (t1) and the heat storage chamber temperature (t4) satisfy both (a) t1 ≦ early combustion confirmation SP and (b ′) t1-t4 ≦ early combustion confirmation temperature difference SP, When it is determined that there is and satisfies at least one of the conditions (c) t1 ≧ early combustion release confirmation SP and (d ′) t1−t4 ≧ early combustion release confirmation temperature difference SP, it is determined that it is not early combustion. Feature It is.
In the present invention configured as described above, the control means determines whether or not the early combustion in which the exhaust gas is heated to a temperature higher than the self-combustion temperature and combusts before reaching the combustion chamber when passing through the heat storage body. When it is determined that early combustion is performed, an early combustion countermeasure operation for forcibly opening the heat discharge damper and extinguishing the heating burner is executed, and when it is determined that early combustion is not performed thereafter, the early combustion countermeasure operation is canceled. It is possible to prevent a decrease in the combustion chamber temperature and an abnormal increase in the exhaust gas temperature caused by the early combustion, and thus an appropriate purification treatment operation can be performed. Furthermore, in the present invention, the control means can accurately and easily determine early combustion based on the combustion chamber temperature (t1) and the heat storage chamber temperature (t4), and further, the combustion chamber temperature (t1) or the heat storage can be determined. Based on the room temperature (t4), it can be determined accurately and easily that it is not early combustion. According to the present invention, since the early combustion and the early combustion release are determined based on the heat storage chamber temperature, the early combustion countermeasure process and the early combustion release process can be performed more quickly.

In the present invention, preferably, the early combustion cancellation confirmation SP is higher than the early combustion confirmation SP, and the early combustion cancellation confirmation temperature difference SP is lower than the early combustion confirmation temperature difference SP.
In the present invention thus configured, the early combustion release confirmation SP is set higher than the early combustion confirmation SP, and the early combustion release confirmation temperature difference SP is set lower than the early combustion confirmation temperature difference SP. Can be easily suppressed.

The present invention preferably further includes an outside air intake damper attached to the outside air intake port of the exhaust gas supply pipe connected to each air supply port of the heat storage chamber, and the control means is configured to When the exhaust damper is forcibly opened, the outside air intake damper is also forcibly opened. When the early combustion countermeasure operation is canceled, the outside air intake damper is forcibly closed, and then the heating burner is ignited.
In the present invention configured as above, the control means forcibly opens the outside air intake damper and takes in outside air (cold air) at the time of performing the early combustion countermeasure operation, so that the flow velocity in the heat storage body on the intake side is accelerated, It is possible to reduce the temperature of the heat storage body in a short time and suppress an increase in the exhaust gas temperature.

According to a third aspect of the present invention, there is provided a temperature control method for an exhaust gas purifying device for purifying exhaust gas containing a flammable toxic component, wherein the exhaust gas purifying device is provided with a heat accumulator and a set of air supply units. A plurality of heat storage chambers provided with openings / exhaust ports, a combustion chamber formed in communication above the plurality of heat storage chambers, and a heat storage chamber attached to each air supply / exhaust port of the heat storage chamber An exhaust / intake valve for switching between intake and exhaust, a heating burner provided in the combustion chamber, and a heat exhaust damper that exhausts excess heat from the combustion chamber. Based on the chamber temperature, the heating burner is ignited and extinguished, the temperature of the combustion chamber temperature is adjusted to the set value (SP) by adjusting the opening of the heat exhaust damper, When passing, the temperature rises above the self-combustion temperature and reaches the combustion chamber It is determined whether it is early combustion that burns before, and when it is determined that it is early combustion, an early combustion countermeasure operation that forcibly opens the heat exhaust damper and extinguishes the heating burner is executed. when it is determined is possess a step of releasing the early combustion measures operation, and determining whether an early combustion, the combustion chamber temperature (t1) and the air supply temperature (t2) · exhaust temperature (t3) Are satisfied when both (a) t1 ≦ early combustion confirmation SP and (b) t3−t2 ≧ early combustion confirmation temperature difference SP are satisfied, and (c) t1 ≧ early combustion release confirmation SP. (D) When at least one of the conditions of (t3−t2 ≦ early combustion release confirmation temperature difference SP) is satisfied, it is determined that it is not early combustion .

According to a fourth aspect of the present invention, there is provided a temperature control method for an exhaust gas purifying device for purifying exhaust gas containing a flammable toxic component, wherein the exhaust gas purifying device is provided with a heat storage body in each and a set of air supply A plurality of heat storage chambers provided with openings / exhaust ports, a combustion chamber formed in communication above the plurality of heat storage chambers, and a heat storage chamber attached to each air supply / exhaust port of the heat storage chamber An exhaust / intake valve for switching between intake and exhaust, a heating burner provided in the combustion chamber, and a heat exhaust damper that exhausts excess heat from the combustion chamber. Based on the chamber temperature, the heating burner is ignited and extinguished, the temperature of the combustion chamber temperature is adjusted to the set value (SP) by adjusting the opening of the heat exhaust damper, When passing, the temperature rises above the self-combustion temperature and reaches the combustion chamber It is determined whether it is early combustion that burns before, and when it is determined that it is early combustion, an early combustion countermeasure operation that forcibly opens the heat exhaust damper and extinguishes the heating burner is executed. when it is determined it is possess a step of releasing the early combustion measures operation, and determining whether an early combustion, the combustion chamber temperature (t1) and regenerator temperature (t4), (a) t1 ≦ Early combustion confirmation SP, (b ′) t1−t4 ≦ Early combustion confirmation temperature difference SP When both are satisfied, it is determined that early combustion is performed, and (c) t1 ≧ early combustion release confirmation SP, (d ′) When at least one of the conditions of t1−t4 ≧ early combustion release confirmation temperature difference SP is satisfied, it is determined that it is not early combustion .

  According to the exhaust gas purifying apparatus and the temperature control method thereof of the present invention, it is possible to perform an appropriate purification operation by preventing a decrease in the combustion chamber temperature and an abnormal increase in the exhaust gas exhaust temperature.

FIG. 1 is an overall configuration diagram showing an exhaust gas purification apparatus (two-column type) according to a first embodiment of the present invention. FIG. 2A is a flowchart showing a preheating step in the operation of the exhaust gas purifying apparatus shown in FIG. FIG. 2B is a flowchart showing a steady processing operation process in the operation of the exhaust gas purification apparatus shown in FIG. FIG. 2C is a flowchart showing the early combustion countermeasure process incorporated in the steady operation process in the operation of the exhaust gas purification apparatus shown in FIG. FIG. 3 shows the relationship between the degree of opening of the damper and the combustion chamber temperature (t1) when the heat exhaust damper is proportionally controlled to the target SP of the combustion chamber temperature in the exhaust gas purifying apparatus according to the first embodiment of the present invention. FIG. FIG. 4 is an overall configuration diagram showing another example (three tower type) of an exhaust gas purification apparatus to which the present invention is applicable. FIG. 5 is an overall configuration diagram showing another example of the exhaust gas purifying apparatus to which the present invention can be applied (rotation switching valve type). FIG. 6 is an overall configuration diagram showing an exhaust gas purifying apparatus according to a second embodiment of the present invention. FIG. 7 is a flowchart showing an early combustion countermeasure process incorporated in a steady operation process (FIG. 2B) in the operation of the exhaust gas purification apparatus shown in FIG.

  Hereinafter, an exhaust gas purification apparatus and a temperature control method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, “set value (target value)” may be described as “SP (Set Point)”.

  First, an exhaust gas purification apparatus and a temperature control method thereof according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a two-column exhaust gas purification apparatus 1 according to a first embodiment of the present invention. This exhaust gas purification apparatus 1 includes a plurality of heat storage chambers 13 (two in the illustrated example) in which a heat storage body 11 is provided, and a combustion chamber formed in communication with the plurality of heat storage chambers 13 and 13. 15. Here, the heat storage body 11 is honeycomb ceramics.

  The heat storage chamber 13 is provided with an air supply port 21 and an exhaust port 23, and air supply / exhaust valves 17 and 19 are attached to the air supply port 21 and the exhaust port 23. These air supply / exhaust valves 17 and 19 are poppet dampers. Further, the combustion chamber 15 is provided with a heating burner 25, further provided with a surplus heat exhaust port 29, and a heat exhaust damper 27 is attached to the surplus heat exhaust port 29. In this exhaust gas purification apparatus 1, the supply side (side to which the gas to be treated is supplied) and the exhaust side (processed gas) of the heat storage chambers 13 and 13 are supplied by the supply / exhaust valves 17 and 19 every predetermined time. Is switched to the side where the gas is discharged). In addition, although the case where the supply / exhaust to the heat storage chamber is switched and operated every predetermined time will be described here, the exhaust gas purifying apparatus according to the present embodiment is not limited to this, and the inlet / outlet temperature (supply / exhaust) The temperature of the gas to be measured is measured by a temperature sensor, and the operation may be performed by switching the supply / exhaust of the heat storage chamber based on the temperature).

  An exhaust gas supply pipe 31 is branchedly connected to each air supply port 21, and a purified gas discharge pipe 32 is joined to each exhaust port 23, and a downstream side of the purified gas discharge pipe 32 is a purified gas exhaust duct. 33.

  Further, an air blower 35 is provided on the upstream side of the branch portion of the exhaust gas supply pipe 31, and an outside air intake port 39 including an outside air intake damper 37 is provided on the upstream side thereof. The outside air inlet 39 may be directly formed on the downstream side of the exhaust gas supply pipe 31, but is connected via the filter box 41 in the present embodiment. The filter box 41 is for removing dust in the exhaust gas and relaxing pressure fluctuations using the filter resistance.

  The above-described outside air intake port 39 and surplus heat exhaust port 29 reduce the heat load in the preheating process and the heat recovery (heat storage) process of the heat storage body 11 on the air supply side and the exhaust side before and after the combustion process in the exhaust gas purification device 1. It is provided to make it.

  Further, the upstream side of the exhaust gas supply pipe 31 is connected to each exhaust gas generation source (for example, a coating apparatus) G1 to G5 in a manifold manner through an exhaust gas cutoff damper (open / close valve) 43. The air release damper 45 is used for urgently releasing exhaust gas when an abnormality occurs in the apparatus and the apparatus is stopped.

  The outline of the operation of the above-described heat storage combustion exhaust gas purification apparatus 1 is as follows. First, the processing gas decomposed at a high temperature of 800 ° C. or higher passes through the heat storage body 11 and is cooled to near room temperature and exhausted. Next, the flow of the exhaust gas is switched by the air supply / exhaust valves 17 and 19. Next, the newly sucked exhaust gas passes through the heated heat accumulator 11 and is heated to close to 800 ° C. and enters the combustion chamber 15, so that it is burned and decomposed with a slight additional energy. If the VOC concentration in the exhaust gas is above a certain level, it becomes a self-combustion state, and the generated energy can be effectively used for a waste heat boiler or the like.

  The present inventors have solved the above-mentioned “problem that the temperature of the combustion chamber of the exhaust gas purifying device may decrease and the exhaust temperature of the purified gas may abnormally increase due to connection with a plurality of exhaust gas generation sources”. In other words, even when the process gas is in a low air volume / high concentration state, there is a solution to prevent a decrease in the temperature of the combustion chamber of the exhaust gas purification device (ignition of an inevitable heating burner) and an abnormal increase in the exhaust temperature. In the process of studying, it has been found that the above-mentioned problems occur due to “early combustion (intermediate combustion)” of exhaust gas.

  Here, “early combustion” means that the amount of treated air is reduced, the passing speed of the heat storage body is slowed, and the exhaust gas is heated to a temperature higher than the self-combustion temperature in the middle of the heat storage body and is too early before reaching the combustion chamber. A phenomenon that burns.

  In this early combustion, the heat of the combustion gas is exchanged in the second half of the heat accumulator on the supply side, so that the temperature of the combustion gas drops and reaches the combustion chamber. That is, the combustion gas (gas to be treated (VOC or the like)) originally combusted in the combustion chamber starts early combustion at the heat storage portion. Thereby, the heat generated by the combustion is absorbed by the heat storage body. Therefore, when the gas reaches the combustion chamber, the amount of heat generated by the combustion of the gas to be treated does not appear as a temperature in the combustion chamber, and a phenomenon that “the combustion chamber temperature becomes equal to or lower than the ignition SP” occurs as described later. To do. As a result, the following problems 1 to 3 are likely to occur.

Problem 1
Since the combustion chamber temperature becomes equal to or lower than the ignition SP, the heating burner is ignited. At that time, since the heat exhaust damper 27 remains closed, the early combustion gas is reheated by the heating burner 25 and the entire amount flows into the exhaust-side heat accumulator. At this time, the exhaust-side heat storage body still has heat from the early combustion when it was on the previous air supply side, so the exhaust-side heat storage body cannot fully recover heat (insufficient heat exchange capacity (heat exchange amount)). Or the exhaust temperature rises abnormally.

Problem 2
Since the heat storage body 11 of the heat storage chamber 13 is switched to the exhaust side while maintaining a high temperature without heat exchange due to early combustion, the heat exchange capacity of the heat storage body for the purified gas (combustion gas) is lowered, and the exhaust temperature rises abnormally.

Problem 3
The heat storage body 11 of the heat storage chamber 13 after the exhaust temperature has risen abnormally tends to become a high-temperature body (heat storage is more than necessary), and when switched to the supply side, early combustion is more likely to occur, Become.

Based on the above-described knowledge, the inventors have come up with an exhaust gas purifying apparatus and a temperature control method thereof suitable when the processing gas is in a low air volume and high concentration state, such as when connecting to a plurality of exhaust gas generation sources.
Hereinafter, characteristic parts of the exhaust gas purifying apparatus and the temperature control method thereof according to the present embodiment will be described.

  The exhaust gas purification apparatus 1 includes a first temperature detector T1 that detects a combustion chamber temperature, a second temperature detector T2 that detects a supply air temperature, and a third temperature detector T3 that detects an exhaust gas temperature. Since these temperature detectors T1, T2, and T3 have a detection temperature as high as at least 650 ° C., a thermocouple is usually used.

  Then, detection signals from the first, second, and third temperature detectors T1, T2, and T3 are input to a microcomputer (MC) input unit. Further, although not shown, an ON signal of each exhaust gas generation source is also input to the MC input unit. Further, the heating burner 25, the heat exhaust damper 27, and the outside air intake damper 37 can be opened and closed by an operation signal from the MC output section. As will be described in detail later, the opening degree of the heat exhaust damper 27 can be adjusted by proportional control.

  Here, in the exhaust gas treatment apparatus according to the present embodiment, the single heat exhaust damper 27 performs both the proportional control of the combustion chamber temperature and the early combustion countermeasure control, but two heat exhaust dampers are provided. These may be controlled separately. Furthermore, the heat exhaust damper 27 may be provided not on the side wall of the combustion chamber but on the ceiling wall.

  Next, the temperature control method in the purification treatment operation of the exhaust gas treatment apparatus according to the present embodiment will be described with reference to FIGS. 2 (A), 2 (B), and 2 (C).

  In FIG. 2A, FIG. 2B, and FIG. 2C, “S” indicates each step. Moreover, the temperature described in parentheses after the set temperature (SP) indicates a selectable temperature range. In each flowchart, “t1” is “combustion chamber temperature detected at T1”, “t2” is “exhaust gas supply temperature detected at T2”, and “t3” is “purified gas exhaust temperature detected at T3”. "Means.

  First, before the operation is started, the air release damper 45 and the exhaust gas cutoff damper 43 provided in the exhaust gas supply pipe 31 are closed, the outside air intake damper 37 is opened, and one heat storage chamber 13 (see FIG. In the example, the supply valve 17 on the left side is opened, the exhaust valve 19 is closed, the supply valve 17 in the other heat storage chamber 13 (right side in the figure) is closed, the exhaust valve 19 is opened, and the heat exhaust damper 27 is further opened. Also keep it closed.

(1) Operation preparation (preheating) step (FIG. 2 (A)):
The microcomputer (MC) is initialized and reset (S100), and the air supply / exhaust switching operation is started (S101). In this operation, air supply / exhaust switching is performed every set time. This set time is 45 to 90 seconds, although it varies depending on the type of exhaust gas.

  Next, the blower 35 is activated (S102), and the heating burner 25 is ignited (S103). When the combustion chamber temperature t1 satisfies t1 ≧ preheating completion SP (650 to 850 ° C.) in the preheating completion determination step (S104), the preheating process is completed and the next processing operation (steady state). Migrate to

  Thus, the heat storage bodies 11 and 11 are stored (preheated) to a temperature at which the supply air can be heated. As the preheating completion SP at this time, a temperature (a temperature 200 to 300 ° C. higher than the target component ignition point temperature) necessary for the component decomposition of the VOC contained in the exhaust gas is selected.

  In the initial setting, a temperature set value (SP) or the like is manually input to the MC storage device as appropriate. In addition, while showing each setting temperature (SP) in Table 1, the height comparison of each temperature setting SP is shown in the column.

(2) Exhaust gas purification treatment operation (FIG. 2 (B)):
1) Processing operation (steady state)
Subsequent to the preheating step, in response to a signal for starting operation of a gas generation source facility (for example, a coating apparatus) (START), the exhaust gas cutoff damper 43 of the selected gas generation source facility is opened (S105) and the outside air intake damper 37 is closed (S106).

  Then, the exhaust gas from the exhaust gas supply pipe 31 is subjected to heat exchange by the heat storage body 11 on the supply side (left side), and after being heated, is purified by combustion in the combustion chamber 15. Further, the heat storage body 11 on the exhaust side (right side) cools by heat exchange and is discharged from the exhaust port 23 through the purified gas discharge pipe 32 to the atmosphere.

  Then, when t1 rises and the conditions equal to or higher than the burner extinguishing SP (700 to 900 ° C.) in the burner extinguishing judgment step (S107) are satisfied, the heating burner 25 is extinguished (S108). This burner fire extinguishing SP is normally set to a temperature at which the exhaust gas can self-combust (self-combustion without heating assistance).

  Further, when t1 rises and satisfies the condition equal to or higher than the proportional control start SP (780 to 920 ° C.) in the proportional control start determination step (S109), t1 is adjusted by adjusting the opening degree of the heat exhaust damper 27. Then, proportional control is performed so as to achieve the target SP (800 to 950 ° C.) (S111).

The combustion chamber temperature t1 rises as self-combustion continues. As described above, the combustion chamber temperature t1 is set to the target SP (target value temperature), and the opening degree of the heat exhaust damper 27 is adjusted (0 to 100%). ) Proportional control. For example, as shown in FIG. 3, the heat exhaust damper 27 has an opening degree of 50% at the target SP, and is fully opened (opening degree 100%) within the adjustment SP + side deviation (target value temperature + 20 ° C.), and the adjustment SP−side deviation. The degree of opening is adjusted in proportion to the temperature difference from the target value so that it is fully closed (opening degree 0%) when the temperature is less than the target value (target temperature -20 ° C). That is, in this embodiment, “proportional temperature control” means a predetermined temperature range (here, a range of 40 ° C.) so that the “combustion chamber temperature” becomes the “set value (target value temperature)” as described above. ) Means control performed proportionally by adjusting the opening degree of the heat exhaust damper 27 (adjusting the opening degree according to the temperature difference with respect to the “set value” of the “combustion chamber temperature”). The “set value (SP)” and “temperature range” are not limited to this.
In the present embodiment, the temperature control is not limited to the above-described proportional temperature control, and may be integral control, differential control, and PID control that is a combination of these control methods.

2) When temperature adjustment control is impossible When t1 cannot be controlled to the upper limit / lower limit value of the deviation temperature by proportional control (S112), when it is lower than the minus side deviation SP as shown below (a), t1 is greater than the plus side deviation SP. Branches to (b) when it becomes higher.

  (a) Conditions outside the -side deviation SP (heat exhaust damper fully closed state) are timed up (S131), and t1 is lowered and burner re-ignition SP (700 to 700 in the burner re-ignition determination step (S132)) When the temperature is lower than 850 ° C., the burner is ignited (S133), and the process returns to the burner extinguishing SP (700 to 900 ° C.) determination step in normal processing operation (S107).

  (b) The condition outside the + side deviation SP (heat exhaust damper fully open state) is timed up (S141), and t1 is increased and the outside air intake start SP (820 to 1000) in the outside air intake start determination step (S142). When the air temperature is higher than (° C.), the outside air intake damper is opened (S143). When t1 is lowered and becomes lower than the outside air intake stop SP (800 to 950 ° C.) in the outside air intake stop determining step (S144), the outside air intake damper is set. Is closed (S145). Thereafter, the process proceeds to proportional control (S111).

(3) Early combustion countermeasure operation (FIG. 2 (C)):
1) Early combustion countermeasure process:
Following the preliminary process described above, an exhaust gas purification treatment operation shown in FIG. 2B is started by an operation start signal of a gas generation source facility (for example, a coating apparatus), and in parallel with the exhaust gas purification treatment operation, The process proceeds to the early combustion countermeasure process shown in FIG.

That is, the combustion chamber temperature (t1), the supply air temperature (t2), and the exhaust temperature (t3)
(A) t1 ≦ early combustion confirmation SP (700 to 880 ° C.)
(B) t3−t2 ≧ early combustion confirmation temperature difference SP (30 to 180 ° C.)
If both conditions are satisfied (S201, S202) and this state is maintained for a certain time (10 to 120 seconds) (S203), it is determined that early combustion has occurred. At this time, if the burner is igniting (S204-1), the burner is extinguished (S204-2), and the heat exhaust damper 27 is opened at the set opening (S205). The set opening degree of the heat exhaust damper 27 is usually in a range of 10 to 70%, and is an optimum value obtained from an experiment according to the type of exhaust gas. On the other hand, if the burner is extinguished (S204-1), the heat exhaust damper 27 is opened at the set opening as it is (S205).

  As an option, when the outside air intake mode is selected (S301), the outside air intake damper is forcibly opened (S302). Thus, by opening the outside air intake damper 37 and taking in outside air (cold air), the flow velocity in the heat storage body 11 on the air supply side is increased, and the temperature of the heat storage body is lowered in a short time to suppress the exhaust temperature rise. It becomes possible. At this time, the opening degree of the outside air intake damper 37 is set to the optimum opening degree obtained from the experiment according to the type of exhaust gas based on the processable air volume of the apparatus. If the outside air intake damper does not have an opening adjustment function, the air volume is adjusted by increasing the frequency of the blower 35.

2) Early combustion countermeasure cancellation process:
After entering the above early combustion countermeasures, the process proceeds to each step in the normal operation process as described below.

(C) t1 ≧ early combustion release confirmation SP (750 to 900 ° C.)
(D) t3−t2 ≦ early combustion release confirmation temperature difference SP (20 to 150 ° C.),
When one of the above continues for a predetermined time (time up: 10 to 120 seconds) (S206, S207, S208-1-2), the heat exhaust damper 27 is fully closed (S209). Thereafter, the process proceeds to a burner re-ignition determination step (S210). When t1 is lower than the burner re-ignition SP (750 to 850 ° C.), the heating burner is ignited (S211), and the process proceeds to step S201 of the early combustion countermeasure operation. Return. If the outside air intake mode is selected, the outside air intake damper is fully closed (S303-1) before the heating burner is ignited (S211).

  In the burner ignition determination step S210, when t1 ≦ burner reignition SP (700 to 850 ° C.) is not satisfied, the process directly returns to step S201 of the early combustion countermeasure operation.

  If the condition of t3-t2 ≦ early combustion cancellation confirmation temperature difference SP is not satisfied in the early combustion cancellation temperature difference determination step (S207), the process proceeds to the early combustion countermeasure forcible cancellation confirmation determination step (S212). In this determination step, when t1 ≦ forced release temperature SP (600 to 700 ° C.) is satisfied, the heat exhaust damper 27 is fully closed (S213), the burner is ignited (S214), and then a predetermined time (10 to 60 minutes). ) After maintenance (S215), the process returns to step S201 of the early combustion countermeasure operation.

  When the outside air intake mode is selected, the outside air intake damper is closed (S303-2) before the heating burner is ignited (S214).

  As described above, the early combustion release confirmation SP is set higher than the early combustion confirmation SP (for example, 20 to 50 ° C.), and the early combustion release confirmation temperature difference SP is set lower than the early combustion confirmation temperature SP (10 to 30 ° C.). As a result, an increase in exhaust gas temperature can be easily suppressed. Even if the early combustion cancellation confirmation SP and the early combustion confirmation SP are the same, and the early combustion cancellation confirmation temperature difference SP is the same as the early combustion confirmation temperature difference SP, an increase in the exhaust gas temperature due to early combustion of the exhaust gas purification apparatus can be suppressed to some extent.

  The end of the exhaust gas purification treatment operation (stop) is to close the heat exhaust damper 27 and extinguish the burner 25, open the outside air intake damper 37, close the exhaust gas cutoff damper 43 and stop the blower 35. Do.

  In addition, the first embodiment of the present invention is not limited to the two-column exhaust gas purification device as shown in FIG. 1, but a large number of heat storage elements such as a three-column type, a four-column type, and a five-column type as shown in FIG. It can also be applied to a multi-tower type exhaust gas purification device having The first embodiment of the present invention is not limited to a multi-column exhaust gas purification device, and can also be applied to a rotary switching valve type exhaust gas purification device using a rotary switching valve 24 as shown in FIG. In each of these drawings, corresponding parts are denoted by the same reference numerals, and description thereof is omitted.

  In these multi-column type / rotation switching valve type devices, one or a plurality of chambers are not used as an air supply chamber / exhaust chamber, but are operated as a purge chamber for purging the heat accumulator 11 in which exhaust gas remains. It is desirable. Purging here means replacing the exhaust gas remaining in the heat accumulator 11 with a clarified gas (purge gas).

  For example, in the case of the three-column type exhaust gas purification apparatus shown in FIG. 4, the two towers are used as the supply chamber and the exhaust chamber as in the conventional case, and the remaining one tower is used as the purge chamber. The gas flow paths are sequentially switched by the dampers 21 and 23.

  In the exhaust gas purifying apparatus shown in FIG. 4, purging uses the purified exhaust gas as a purge gas, and the exhaust gas discharged by the purge from the heat storage body 11 is returned to the apparatus inlet (filter box 41) through the return pipe 22. Alternatively, the purge gas may be set to the atmosphere, the return pipe 22 may be a purge gas blowing pipe, a blower (not shown) may be connected to the pipe, and purge may be performed by blowing the purge gas into the heat storage body 11.

  Further, the rotation switching valve type purification apparatus shown in FIG. 5 assigns three towers out of the eight towers to the supply chamber 13A and the exhaust chamber 13B, and the remaining two towers to the purge chamber 13C and the non-use chamber 13D. The rotary switching valve 24 is operated by switching to the forward feed in the same manner as described above.

  As described above, when the purifying operation is performed by providing the purge chamber, since the purged heat storage element 11 is used as the exhaust heat storage element 11, the peak concentration of the outflow of untreated gas when the damper is switched is exhibited. It becomes easy to ensure the purification performance of the exhaust gas containing flammable harmful components such as VOC. Of course, a purification operation without a purge chamber is also possible.

  Further, the exhaust gas purifying apparatus according to the present embodiment is not limited to the one having a large number of suction cutoff dampers 43 as shown in FIGS. 1, 4, and 5. Since the concentration may change, the present invention can be applied regardless of the number of suction cutoff dampers 43 on the gas supply side.

  As described above, the exhaust gas purifying apparatus 1 according to the present embodiment includes a plurality of heat storage chambers 13 each provided with a heat storage body 11 and provided with a pair of air supply / exhaust ports 21 and 23, and these. A combustion chamber 15 formed in communication with the plurality of heat storage chambers, and an exhaust for switching intake / exhaust to the heat storage chamber 13 attached to each of the air supply / exhaust ports 21 and 23 of the heat storage chamber 15 Intake valves 17, 19, a heating burner 25 provided in the combustion chamber 13, a heat exhaust damper 27 that exhausts excess heat from the combustion chamber 15, and a microcomputer (MC), and an intake / exhaust valve 17, 19, the air supply / exhaust to the heat storage chamber 13 is switched for every predetermined time. Further, the microcomputer (MC) ignites and extinguishes the heating burner based on the combustion chamber temperature t1, and adjusts the opening degree of the heat exhaust damper 27 so that the combustion chamber temperature t1 becomes the set value (SP). Proportional temperature control is performed.

  Further, in the exhaust gas purifying apparatus 1 according to the present embodiment, the microcomputer (MC) is an early combustion in which the exhaust gas is heated up to the self-combustion temperature and combusted before reaching the combustion chamber 15 when the exhaust gas passes through the heat storage body 11. If it is determined whether or not it is early combustion, an early combustion countermeasure operation for forcibly opening the heat discharge damper 27 and extinguishing the heating burner 15 is executed. Since the countermeasure operation is released, it is possible to prevent a decrease in the combustion chamber temperature and an abnormal increase in the exhaust gas temperature due to early combustion.

  In the exhaust gas purifying apparatus according to the present embodiment, when the microcomputer (MC) satisfies both the relational expressions (a) and (b), the heat exhaust damper 27 is forcibly opened and the burner is extinguished early. When one or both of the above-mentioned relational expressions (c) and (d) are not satisfied after the combustion countermeasure operation, the heat exhaust damper is fully closed and the control is performed so that the early combustion countermeasure cancellation operation is performed. Therefore, it is possible to accurately and easily determine that the combustion is early combustion, and execute the early combustion countermeasure operation.

  As described above, when the temperature of the combustion chamber is abnormally lowered, VOC in the exhaust gas cannot be decomposed and it is necessary to stop the purification processing operation. However, according to the exhaust gas purification apparatus 1 according to the present embodiment, this purification processing operation is stopped. It is difficult to cause an abnormal decrease in the combustion chamber temperature and an abnormal increase in the exhaust temperature that lead to

  That is, the combustion chamber temperature drop and the exhaust gas temperature rise are monitored, and when these temperatures reach the set values, the heat exhaust damper 27 is opened to reduce the gas flow rate flowing through the exhaust-side heat accumulator. As a result, the amount of heat stored in the heat storage body is reduced, thereby suppressing an abnormal increase in the exhaust gas temperature.

  Further, by suppressing the abnormal decrease in the combustion chamber temperature, it is possible to suppress the number of purification treatment operation stops and unnecessary ignition of the heating burner, and to suppress the amount of fuel used in the combustion chamber heating burner.

  In addition, if the regenerative combustion gas purification device is provided with a surplus heat exhaust damper, this embodiment can be implemented only by changing the temperature sensor and the control program without modifying the exhaust gas purification device itself. Become.

  Furthermore, according to the exhaust gas purification apparatus according to the present embodiment, by taking cold air forcibly from the outside air intake damper installed on the upstream side of the apparatus and increasing the amount of gas air, further abnormal situations such as early combustion, etc. Can be eliminated in a short time.

  As described above, according to the exhaust gas purification apparatus 1 and the temperature control method thereof according to the present embodiment, an appropriate purification treatment operation is realized by preventing a decrease in the combustion chamber temperature and an abnormal increase in the purification gas exhaust temperature. Can do.

  Next, an exhaust gas purification apparatus and a temperature control method thereof according to a second embodiment of the present invention will be described with reference to FIGS. 2 (A), 2 (B), 6 and 7. In the second embodiment, except that the exhaust gas purification device is controlled using the heat storage chamber temperature (t4) instead of the supply air temperature (t2) and the exhaust gas temperature (t3) in the first embodiment described above. This is the same as in the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 6, the exhaust gas purifying apparatus 501 according to the second embodiment of the present invention includes a plurality of heat storage chambers 13 (two in the example) in which the heat storage body 11 is installed, and the plurality of heat storage chambers. And a combustion chamber 15 formed in communication with the chambers 13 and 13.

  The heat storage chamber 13 has an air supply port 21 and an exhaust port 23 to which air supply / exhaust valves 17 and 19 are attached. The combustion chamber 15 has a heating burner 25 and a surplus heat exhaust port 29 to which a heat exhaust damper 27 is attached. The operation is performed by switching between the supply side and the exhaust side of the heat storage chambers 13 and 13 by the supply / exhaust valves 17 and 19 every elapse of a predetermined time.

  Similarly to the exhaust gas purification device 1, the exhaust gas purification device 501 includes an exhaust gas supply pipe 31, a purified gas discharge pipe 32, a purified gas exhaust duct 33, a blower 35, an outside air intake damper 37, an outside air intake port 39, and a filter box 41. Etc. are provided.

  The exhaust gas purifying apparatus 501 includes a first temperature detector T1 that detects the temperature of the combustion chamber and a fourth temperature detector T4 that detects the temperature of the heat storage chamber. Since these temperature detectors have a detection temperature as high as at least 650 ° C., a thermocouple is usually used. Similarly to the first temperature detector T1, the detection signal from the fourth temperature detector T4 can also be input to the microcomputer (MC) input unit.

  The temperature control in the purification treatment operation of the exhaust gas purification apparatus 501 is performed according to the flowcharts shown in FIGS. 2 (A), 2 (B), and 7. That is, in the exhaust gas purifying apparatus 501 according to the second embodiment, the processing of S701, S702, S706, and S707 in FIG. 7 is performed instead of S201, S202, S206, and S207 in FIG. Since steps other than these are performed in the same flow as in the first embodiment, description thereof will be omitted. Here, “t4” in the flowchart of FIG. 7 means “thermal storage chamber temperature detected at T4”.

  In the purification treatment operation of the exhaust gas purification apparatus 501, "(1) Operation preparation (preheating) step (FIG. 2A):" and "(2) Exhaust gas purification treatment operation (FIG. 2B):" This is the same as in the first embodiment.

(4) Early combustion countermeasure operation (Fig. 7):
1) Early combustion countermeasure process:
When the combustion chamber temperature t1 becomes lower than the burner extinguishing SP in the above-described normal operation burner extinguishing judgment step (S107) and the exhaust gas composition may cause early combustion, the early combustion countermeasure process is entered.

That is, the combustion chamber temperature (t1) and the heat storage chamber temperature (t4) are
(A) t1 ≦ early combustion confirmation SP (700 to 880 ° C.)
(B ′) t1−t4 ≦ early combustion confirmation temperature difference SP (100 to 300 ° C.)
If both conditions are satisfied (S701, S702) and this state is maintained for a certain period of time (10 to 120 seconds) (S203), it is determined that early combustion has occurred, and the burner is While extinguishing the fire (S204), the heat exhaust damper 27 is opened at the set opening (S205). The set opening degree of the heat exhaust damper 27 at this time is usually in a range of 10 to 70%, and is an optimum value obtained from an experiment according to the type of exhaust gas.
Here, t4 used in (b ′) or (d ′) described later is basically a heat storage chamber temperature detected by a temperature sensor (fourth temperature detector T4) provided in the heat storage chamber on the supply side. The use of is more advantageous as an early combustion countermeasure. Note that when early combustion occurs, the temperatures of both the heat storage chambers in which the supply side and the exhaust side are sequentially switched gradually increase. For example, a temperature sensor (fourth temperature detector T4) provided in the heat storage chamber is provided. It is also possible to provide one of the heat storage chambers and always use the temperature in the heat storage layer of the heat storage chamber as t4.

  Note that, as an option, when the outside air intake mode is selected (S301), the outside air intake damper is forcibly opened (S302), as in the first embodiment.

2) Early combustion countermeasure cancellation process:
After entering the above early combustion countermeasures, the process proceeds to each step in the normal operation process as described below.

(C) t1 ≧ early combustion release confirmation SP (750 to 900 ° C.)
(D ′) t1−t4 ≧ early combustion release confirmation temperature difference SP (150 to 350 ° C.),
When one of the above continues for a predetermined time (time up: 10 to 120 seconds) (S706, S707, S208-1-2), the heat exhaust damper 27 is fully closed (S209). The subsequent steps (S210, S211, S303-1, etc.) are the same as in FIG. 2C.

  If the condition of t3−t2 ≦ early combustion cancellation confirmation temperature difference SP is not satisfied in the early combustion cancellation temperature difference determination step (S707), the process proceeds to the early combustion countermeasure forcible cancellation confirmation determination step (S212). S212 and subsequent steps (S213, S214, S215, S303-2, etc.) are the same as those in FIG.

  As described above, the early combustion release confirmation SP is set higher than the early combustion confirmation SP (for example, 20 to 50 ° C.), and the early combustion release confirmation temperature difference SP is set lower than the early combustion confirmation temperature SP (10 to 30 ° C.). This is desirable because it is easy to suppress an increase in the exhaust gas temperature. Even if the early combustion cancellation confirmation SP and the early combustion confirmation SP are the same, and the early combustion cancellation confirmation temperature difference SP is the same as the early combustion confirmation temperature difference SP, an increase in the exhaust gas temperature due to early combustion of the exhaust gas purification apparatus can be suppressed to some extent.

  The end of the exhaust gas purification treatment operation (stop) is to close the heat exhaust damper 27 and extinguish the burner 25, open the outside air intake damper 37, close the exhaust gas cutoff damper 43 and stop the blower 35. Do.

  In addition, the second embodiment is not limited to the two-column exhaust gas purification device shown in FIG. 6, and similarly to the first embodiment, a large number of heat storage elements such as a three-tower type, a four-tower type, and a five-tower type are used. The present invention can also be applied to a multi-column exhaust gas purification apparatus having a rotary switching valve type exhaust gas purification apparatus using a rotary switching valve 24.

  In the exhaust gas purifying apparatus according to the present embodiment, when the microcomputer (MC) satisfies both of the above relational expressions (a) and (b ′), the heat exhaust damper 27 is forcibly opened and the early combustion that burns out the burner is performed. When one or both of the above-described relational expressions (c) and (d ′) are not satisfied after the countermeasure operation is performed, the heat exhaust damper 27 is fully closed and the control is performed so that the early combustion countermeasure cancellation operation is performed. I have to.

  Furthermore, since the exhaust gas purifying apparatus 501 according to the present embodiment determines that the difference between the heat storage chamber temperature (t4) and the combustion chamber temperature (t1) has become smaller than the normal value, the early combustion release operation is started. Thus, it is possible to detect that it is necessary to start the early combustion countermeasure operation more quickly than the temperature control method (first embodiment) using the relational expression (b) described above. realizable. In particular, it is possible to detect that an early combustion countermeasure operation is required more quickly regardless of the amount of change in the processing air volume.

Claims (8)

An exhaust gas purification device for purifying exhaust gas containing flammable toxic components,
A plurality of heat storage chambers each provided with a heat storage body and provided with a pair of air supply / exhaust ports;
A combustion chamber formed in communication above the plurality of heat storage chambers;
An exhaust / intake valve attached to each of the air supply / exhaust ports of the heat storage chamber for switching intake / exhaust to the heat storage chamber;
A heating burner provided in the combustion chamber;
A heat discharge damper for discharging excess heat from the combustion chamber;
Control means for igniting and extinguishing the heating burner based on the combustion chamber temperature, and adjusting the opening of the heat exhaust damper to control the temperature so that the combustion chamber temperature becomes a set value (SP);
A combustion chamber temperature sensor attached to the combustion chamber for detecting the temperature of the combustion chamber, an intake air temperature sensor for detecting the intake air temperature attached to each of the intake and exhaust ports of the heat storage chamber, and an exhaust gas temperature sensor for detecting the exhaust temperature; , has a,
When the exhaust gas passes through the heat storage body, the control means determines whether or not it is early combustion that rises above the self-combustion temperature and combusts before reaching the combustion chamber. An early combustion countermeasure operation for forcibly opening the discharge damper and extinguishing the heating burner is executed, and when it is determined that it is not early combustion thereafter, the early combustion countermeasure operation is canceled,
The control means includes a combustion chamber temperature (t1), an intake air temperature (t2), and an exhaust gas temperature (t3) detected by the combustion chamber temperature sensor, the intake air temperature sensor, and the exhaust gas temperature sensor, respectively.
(A) t1 ≦ early combustion confirmation SP,
(B) t3−t2 ≧ early combustion confirmation temperature difference SP,
When satisfying both, it is determined that it is early combustion,
(C) t1 ≧ early combustion release confirmation SP,
(D) t3−t2 ≦ early combustion release confirmation temperature difference SP,
An exhaust gas purifying apparatus characterized in that when at least one of the above conditions is satisfied, it is determined that the combustion is not early combustion . An exhaust gas purification device for purifying exhaust gas containing flammable toxic components,
A plurality of heat storage chambers each provided with a heat storage body and provided with a pair of air supply / exhaust ports;
A combustion chamber formed in communication above the plurality of heat storage chambers;
An exhaust / intake valve attached to each of the air supply / exhaust ports of the heat storage chamber for switching intake / exhaust to the heat storage chamber;
A heating burner provided in the combustion chamber;
A heat discharge damper for discharging excess heat from the combustion chamber;
Control means for igniting and extinguishing the heating burner based on the combustion chamber temperature, and adjusting the opening of the heat exhaust damper to control the temperature so that the combustion chamber temperature becomes a set value (SP);
A combustion chamber temperature sensor attached to the combustion chamber for detecting the temperature of the combustion chamber, a heat storage chamber temperature sensor attached to the heat storage chamber for detecting the temperature of the heat storage chamber , and
When the exhaust gas passes through the heat storage body, the control means determines whether or not it is early combustion that rises above the self-combustion temperature and combusts before reaching the combustion chamber. An early combustion countermeasure operation for forcibly opening the discharge damper and extinguishing the heating burner is executed, and when it is determined that it is not early combustion thereafter, the early combustion countermeasure operation is canceled,
The control means includes a combustion chamber temperature (t1) and a heat storage chamber temperature (t4) detected by the combustion chamber temperature sensor and the heat storage chamber temperature sensor, respectively.
(A) t1 ≦ early combustion confirmation SP,
(B ′) t1−t4 ≦ early combustion confirmation temperature difference SP,
When satisfying both, it is determined that it is early combustion,
(C) t1 ≧ early combustion release confirmation SP,
(D ′) t1−t4 ≧ early combustion release confirmation temperature difference SP,
An exhaust gas purifying apparatus characterized in that when at least one of the above conditions is satisfied, it is determined that the combustion is not early combustion . The exhaust gas purification apparatus according to claim 1 or 2 , wherein the early combustion cancellation confirmation SP is higher than the early combustion confirmation SP, and the early combustion cancellation confirmation temperature difference SP is lower than the early combustion confirmation temperature difference SP. Furthermore, it has an outside air intake damper attached to the outside air intake port of the exhaust gas supply pipe connected to each air supply port of the heat storage chamber, and the control means forces the heat exhaust damper when the early combustion countermeasure operation is executed. The exhaust gas purifying apparatus according to claim 3 , wherein the outside air intake damper is also forcibly opened when opened, the outside air intake damper is forcibly closed when the early combustion countermeasure operation is released, and then the heating burner is ignited. A temperature control method for an exhaust gas purification device for purifying exhaust gas containing a flammable toxic component,
The exhaust gas purification device is
A plurality of heat storage chambers each provided with a heat storage body and provided with a pair of air supply / exhaust ports;
A combustion chamber formed in communication above the plurality of heat storage chambers;
An exhaust / intake valve attached to each of the air supply / exhaust ports of the heat storage chamber for switching intake / exhaust to the heat storage chamber;
A heating burner provided in the combustion chamber;
A heat exhaust damper for exhausting excess heat from the combustion chamber,
A temperature control method for the exhaust gas purification device
Igniting / extinguishing the heating burner based on the combustion chamber temperature, and adjusting the opening of the heat exhaust damper to control the temperature so that the combustion chamber temperature becomes a set value (SP);
When exhaust gas passes through the heat accumulator, it is determined whether it is early combustion that rises above the self-combustion temperature and burns before reaching the combustion chamber, and when it is determined that early combustion, the heat exhaust damper is forcibly opened. the heating burner running early combustion measures operation to extinguish while, when it is determined that it is not a premature combustion after this, have a, a step of releasing the early combustion measures operation,
In the step of determining whether or not the early combustion, the combustion chamber temperature (t1), the supply air temperature (t2), and the exhaust gas temperature (t3)
(A) t1 ≦ early combustion confirmation SP,
(B) t3−t2 ≧ early combustion confirmation temperature difference SP,
When satisfying both, it is determined that it is early combustion,
(C) t1 ≧ early combustion release confirmation SP,
(D) t3−t2 ≦ early combustion release confirmation temperature difference SP,
A temperature control method for an exhaust gas purification apparatus, wherein when it satisfies at least one of the conditions, it is determined that the combustion is not early combustion . A temperature control method for an exhaust gas purification device for purifying exhaust gas containing a flammable toxic component,
The exhaust gas purification device is
A plurality of heat storage chambers each provided with a heat storage body and provided with a pair of air supply / exhaust ports;
A combustion chamber formed in communication above the plurality of heat storage chambers;
An exhaust / intake valve attached to each of the air supply / exhaust ports of the heat storage chamber for switching intake / exhaust to the heat storage chamber;
A heating burner provided in the combustion chamber;
A heat exhaust damper for exhausting excess heat from the combustion chamber,
A method for controlling the temperature of the exhaust gas purifying device comprises:
Igniting / extinguishing the heating burner based on the combustion chamber temperature, and adjusting the opening of the heat exhaust damper to control the temperature so that the combustion chamber temperature becomes a set value (SP);
When exhaust gas passes through the heat accumulator, it is determined whether it is early combustion that rises above the self-combustion temperature and burns before reaching the combustion chamber, and when it is determined that early combustion, the heat exhaust damper is forcibly opened. the heating burner running early combustion measures operation to extinguish while, when it is determined that it is not a premature combustion after this, have a, a step of releasing the early combustion measures operation,
In the step of determining whether or not the early combustion, the combustion chamber temperature (t1) and the heat storage chamber temperature (t4)
(A) t1 ≦ early combustion confirmation SP,
(B ′) t1−t4 ≦ early combustion confirmation temperature difference SP,
When satisfying both, it is determined that it is early combustion,
(C) t1 ≧ early combustion release confirmation SP,
(D ′) t1−t4 ≧ early combustion release confirmation temperature difference SP,
A temperature control method for an exhaust gas purification apparatus, wherein when it satisfies at least one of the conditions, it is determined that the combustion is not early combustion . The temperature control method for an exhaust gas purification apparatus according to claim 5 or 6 , wherein the early combustion release confirmation SP is higher than the early combustion confirmation SP, and the early combustion release confirmation temperature difference SP is lower than the early combustion confirmation temperature difference SP. The exhaust gas purification device further includes an outside air intake damper attached to an outside air intake port of an exhaust gas supply pipe connected to each air supply port of the heat storage chamber, and determining whether or not the early combustion is performed Is determined to be early combustion, when the heat exhaust damper is forcibly opened, the outside air intake damper is also forcibly opened, and when it is determined not to be early combustion, the outside air intake damper is forcibly closed. The temperature control method for an exhaust gas purification apparatus according to claim 7, wherein the heating burner is ignited.

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