JP2003139316A - Heat storage type volatile organic compound treatment device and treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volatile organic compound (VOC) containing exhaust gas treatment device and method securing VOC removal efficiency when VOC concentration rises after a process change-over while minimizing consumption of stabilizing burner fuel when the VOC concentration becomes very small in a process change-over process in regard to manufacturing and treatment processes for various products generating VOC containing exhaust gas. SOLUTION: A process changing signal or a measured value of a VOC concentration measuring apparatus 13 in the manufacturing and treatment processes of various products generating VOC containing exhaust gas is inputted, and a set gas temperature for controlling a furnace is outputted by a controller 10. A gas temperature in the furnace is set at a standby temperature in a process change-over process not generating VOC by a combustion temperature control means, and it is normally set lower than a set temperature in burning and removing VOC. Consequently, fuel in the process change-over process is not excessively consumed, and a state capable of corresponding to VOC concentration rise after finishing the process change-over can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treating apparatus for purifying an exhaust gas containing a volatile organic compound (hereinafter sometimes referred to as VOC) generated in a papermaking process by burning it in a furnace, and particularly to an exhaust gas. If the concentration of volatile organic compounds becomes low during the switching process of the generation process, the amount of auxiliary burner fuel used is minimized, the furnace temperature is maintained at an appropriate value, and the volatile organic compounds after the switching of the exhaust gas generation process are completed. The present invention relates to an exhaust gas treatment apparatus and method capable of ensuring VOC removal efficiency when the compound concentration increases.

[0002]

2. Description of the Related Art Paint is used in various facilities such as a coating booth, a coating drying oven, a printing drying oven, a plastic or plywood manufacturing facility, a food processing facility, an industrial waste treatment facility, a digestive agent manufacturing facility or a perfume manufacturing facility. Ink, solvent adhesive synthetic resin, chemicals Alcohols, esters, flammable and harmful odorous components such as phenols and aldehydes, which have a harmful and peculiar odor, are generated. Exhaust gas containing such a harmful malodorous component cannot be directly emitted to the atmosphere from the viewpoint of pollution prevention, and therefore is usually released to the atmosphere in a harmless and odorless state by deodorizing treatment.

As a typical deodorizing device, there is a heat storage type exhaust gas treatment device which recovers combustion heat of harmful components and reuses it as a heat source of untreated exhaust gas in consideration of running cost and ease of maintenance.

FIG. 4 shows a conceptual diagram of a heat storage type exhaust gas treating apparatus. First, a purification process of a volatile organic compound (hereinafter, also referred to as VOC) -containing gas in a heat storage type exhaust gas treatment apparatus will be described along a gas flow. Upstream VOC
VOC-containing exhaust gas 1 exhausted in the manufacturing or treatment process of the various facilities for generating exhaust gas containing is introduced into a heat storage type exhaust gas treatment device by a blower (not shown), and a rotary distributor 2
It contacts with the heat storage body (honeycomb body, porous body, etc.) stored in the heat storage chamber 3 which is kept at a high temperature via. This process is called a reheat process, and the VOC-containing exhaust gas 1 receives heat from the heat storage body to raise the temperature.

The exhaust gas 1 whose flow rate is distributed by the rotary distributor 2 is introduced into the heat storage chamber 3 which houses the heat storage body.
Is divided into a plurality of sectors (rooms) 3a to 3n, and each room 3
Heat is exchanged in each heat storage body housed in a to 3n (see FIG. 5). The reheat process is performed in almost half of the chambers 3a to 3n, and the heat storage process described later is performed in the remaining half of the chambers. Further, there is also a part of the chamber in which the purge fluid supplied from the valve 12 in which the cooling gas is supplied to prevent the VOC from remaining in the system flows.

Further, the rotary distributor 2 is a rotary VOC-containing exhaust gas introducing passage distributing device, and by rotating the rotary distributor 2, the plurality of heat storage chambers 3a to 3n are sequentially switched to the VOC-containing exhaust gas introducing passage. At that time, the heat storage chambers 3a to 3n which are not the VOC-containing exhaust gas introduction flow paths become the furnace purified gas discharge flow paths. Therefore, the VOC-containing exhaust gas 1 introduced into the furnace by switching the flow paths is preheated by the heat stored in the heat storage bodies of the heat storage chambers 3a to 3n, which are the purified gas discharge flow paths.

The exhaust gas 1 heated in the reheating process is mixed in the furnace 5, burned by the flame of the burner 6 installed in the furnace 5, and further heated. When the VOC reaches a temperature at which it self-combusts, the VOC is burned and removed even when the burner 6 is stopped. The VOC-containing exhaust gas 1 that has exited the heat storage chamber 3 may be burned in the combustion catalyst layer 8 arranged before entering the furnace 5.

The purified gas 7 from which VOCs have been removed in the furnace 5 heats the heat storage body in the course of passing through the heat storage body (heat storage process), and is further discharged to the outside of the system via the rotary distributor 2. Since the heat storage type exhaust gas treatment device is designed to burn and remove VOCs in the furnace 5, maintaining the gas temperature in the furnace 5 is the most important factor for maintaining VOC removal efficiency, and normally 820 ° C. It is maintained at a temperature of the order.

Next, FIG. 5 illustrates a conventional method for controlling the furnace temperature, which is the most important control factor in the heat storage type exhaust gas treatment apparatus, to a constant value. VOC in VOC-containing exhaust gas 1
The concentration varies depending on the product treated in the process on the upstream side of the heat storage type exhaust gas treatment device. Further, even the same product does not maintain a constant value by changing with the passage of time. In this way, the VOC-containing exhaust gas 1 whose concentration changes in this way passes through the rotary distributor 2 in the device shown in FIG.
The VOCs are introduced into the heat storage chambers (sectors) 3a to 3n divided into eight chambers, and then the VOCs are burned and removed in the furnace 5. In the control device 100 for that purpose, the temperature Tf in the furnace 5 is fed back to operate the auxiliary fuel addition amount adjustment valve 11.

That is, in the conventional operation method of the heat storage type exhaust gas treating apparatus shown in FIG. 5, when the VOC concentration in the exhaust gas decreases, the temperature rise due to self-combustion of the VOC decreases and the inside of the furnace 5 is reduced. In order for the gas temperature Tf of the fuel cell to fall below the set temperature Ts, the opening / closing degree of the fuel addition amount adjustment valve 11 is adjusted by the control signal output from the control device 100 to burn the furnace burner 6, thereby lowering the furnace gas temperature. It supplements the amount and maintains the removal efficiency.

FIGS. 6 and 7 show changes with time in the furnace temperature, the amount of auxiliary fuel added, the VOC removal efficiency, and the VOC concentration according to the conventional operating method of the heat storage type exhaust gas treatment apparatus shown in FIG. The example shown in FIG. 6 shows the trends of the furnace gas temperature, the amount of auxiliary fuel added, and the VOC removal efficiency when the burner 6 is not burned even when the VOC concentration becomes zero. In FIG. 7, the VOC concentration becomes zero. In this case, the trends of the furnace gas temperature, the amount of auxiliary fuel added, and the VOC removal efficiency when burning the burner 6 are shown.

[0012]

In the method of controlling the temperature in the furnace 5 of the heat storage type exhaust gas treating apparatus according to the above-mentioned prior art, the temperature of the furnace 5 is always controlled to a constant value, and the exhaust gas generating apparatus on the upstream side, for example, manufacturing Even when the type of product manufactured in the apparatus is switched, the furnace gas temperature Tf is maintained at the normal operating temperature even though VOC is not generated. When VOCs are not generated in this way, there is no temperature rise due to self-combustion of VOCs, and in order to maintain the furnace gas temperature, it is necessary to maintain the furnace gas temperature Tf only by combustion by the burner 6. Further, since no VOC is generated, when the use of the burner 6 is stopped, as shown in FIG. 6 (c), the VOC removal efficiency is greatly reduced when the VOC concentration rises after the manufacturing process switching is completed. Become.

An object of the present invention is to minimize the amount of burner fuel used for auxiliary combustion while reducing the concentration of volatile organic compounds when the concentration of volatile organic compounds decreases in the process switching process in the exhaust gas generation process for generating exhaust gas containing volatile organic compounds. It is an object of the present invention to provide a volatile organic compound-containing exhaust gas treatment apparatus and method capable of ensuring VOC removal efficiency when the concentration of volatile organic compounds rises after completion of switching of generation steps.

[0014]

The above-mentioned problems of the present invention are solved by the following constitutions (1) to (4). (1) An inlet for introducing exhaust gas containing a volatile organic compound discharged from an exhaust gas generator, a furnace for burning the volatile organic compound introduced from the inlet together with a fuel for supporting combustion, and a purified gas from the furnace Is disposed between the furnace and an area that constitutes the inlet and the outlet, and an outlet that discharges
A volatile organic compound-containing exhaust gas from the inlet portion and a heat storage chamber containing a heat storage body that transfers the heat of the fuel purification gas to the volatile organic compound-containing exhaust gas when the purified gas from the furnace passes are provided. In a heat storage type volatile organic compound-containing exhaust gas treatment device, a volatile organic compound concentration measuring means for measuring the concentration of volatile organic compound in the exhaust gas provided at the inlet, and a measured value of the volatile organic compound concentration measuring means In accordance with the above, the heat storage with a combustion temperature control means for burning the auxiliary combustion fuel by switching the control of the combustion gas temperature in the furnace to the normal furnace operating temperature and the standby temperature set to a combustion temperature lower than the normal operating temperature Type volatile organic compound-containing exhaust gas treatment equipment.

(2) An inlet for introducing the volatile organic compound-containing exhaust gas discharged from the exhaust gas generator, a furnace for burning the volatile organic compound introduced from the inlet together with a fuel for supporting combustion, and the furnace Is disposed between the outlet part for discharging the purified gas, the region forming the inlet part and the outlet part, and the furnace, and the volatile organic compound-containing exhaust gas from the inlet part and the purified gas from the furnace pass through. In a heat storage type volatile organic compound-containing exhaust gas treatment device having a heat storage chamber that stores a heat storage body that transfers the heat of the purified gas to the volatile organic compound-containing exhaust gas, the exhaust gas generation amount of the exhaust gas generation device is related to Depending on the process change signal and the presence or absence of the signal, the control of the combustion gas temperature in the furnace is switched to the normal furnace operating temperature and the standby temperature set to the combustion temperature lower than the normal operating temperature. Regenerative volatile organic compound-containing exhaust gas treatment apparatus provided with a combustion temperature control means furnace for combusting the supporting fuel.

(3) The volatile organic compound-containing exhaust gas discharged from the exhaust gas generator is passed through the heat storage body, and then burnt in the furnace with the fuel for auxiliary combustion to form a purified gas, and the purified gas is stored in the heat storage body. In the heat storage type volatile organic compound-containing exhaust gas treatment method of preheating the volatile organic compound-containing exhaust gas through a heat storage body, the concentration of the volatile organic compound in the exhaust gas introduced into the furnace is measured, and the volatile In accordance with the measured value of the organic compound concentration, the control of the combustion gas temperature in the furnace is switched to the normal furnace operating temperature and the standby temperature set to a combustion temperature lower than the normal operating temperature to burn the auxiliary combustion fuel. For treating exhaust gas containing organic compounds.

(4) Exhaust gas containing a volatile organic compound discharged from the exhaust gas generator is passed through the heat storage body and then burnt in a furnace together with fuel for auxiliary combustion to form a purified gas, and the purified gas is stored in the heat storage body. In the heat storage type volatile organic compound-containing exhaust gas treatment method of preheating the volatile organic compound-containing exhaust gas through the heat storage medium, the process change signal related to the exhaust gas generation amount of the exhaust gas generator and the presence or absence of the signal. Accordingly, the heat storage type volatile organic compound exhaust gas treatment method of burning the auxiliary combustion fuel by switching the control of the combustion gas temperature in the furnace to a normal furnace operating temperature and a standby temperature set to a combustion temperature lower than the normal operating temperature.

[0018]

[Operation] Process change signal or V in the manufacturing / processing process of various products that generate exhaust gas containing volatile organic compounds
The measured value of the OC concentration is input, and the fuel supply amount into the furnace is controlled in order to control the gas temperature in the furnace by the control device equipped with the combustion temperature control means. This control gas temperature is V
In the process switching process in which OC is not generated, the temperature is set as a standby temperature, and is usually set lower than the set temperature when burning and removing volatile organic compounds. Therefore, the fuel is not excessively consumed in the process of switching the manufacturing / processing steps, and it is possible to maintain the state in which the increase in VOC concentration after completion of the process switching can be coped with.

As described above, the gas temperature in the furnace is determined from the normal operating temperature and the normal operating temperature according to the measured value of VOC concentration in the exhaust gas at the inlet of the heat storage type exhaust gas treatment apparatus of the present invention or the presence or absence of the process change signal. The combustion temperature control means for switching to and outputting the standby temperature set to a low level outputs the normal operating temperature because VOC is detected in the normal operating state,
The furnace gas temperature is maintained and VOCs are burned and removed.

On the other hand, since the VOC concentration becomes very small in the process switching process in the manufacturing / treatment process of various products that generate VOC-containing exhaust gas, the combustion temperature control means is set lower than the normal operating temperature. Output the standby temperature. This makes it possible to reduce the amount of auxiliary combustion fuel used. After the process switching is completed, VO in the exhaust gas
As C rises, the normal operating temperature is output, the furnace gas temperature is maintained, and the VOC is burned and removed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. In the heat storage type exhaust gas treatment device shown in FIG.
VOC-containing exhaust gas 1 emitted in the exhaust gas generation process of various facilities (not shown) that generate exhaust gas containing VOC on the upstream side
Is introduced into the heat storage type exhaust gas treatment device by a blower (not shown), and is constituted by a honeycomb body or the like via the rotary distributor 2.
The heat storage body of the heat storage chamber 3 kept at a high temperature is contacted (reheat process). This VOC-containing exhaust gas 1
Is heated by receiving heat from the heat storage body. The same components as those of the heat storage type exhaust gas treatment apparatus shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. The number of burners 6 installed is appropriately determined depending on the size of the furnace 5 and the VOC concentration of the VOC-containing exhaust gas flowing into the furnace 5.

As described in the heat storage type exhaust gas treatment apparatus shown in FIG. 5, the exhaust gas 1 whose flow rate is distributed by the rotary distributor 2 is introduced into the heat storage body in the heat storage chamber 3, but the heat storage chamber 3 has a plurality of heat storage chambers. The sectors (chambers) 3a to 3n are separated, and a reheat process is performed in almost half of the chambers, and a heat storage process described later is performed in the remaining half chambers. Further, there is also a part in which a purge fluid flows so that a cooling gas is flowed to prevent VOCs from remaining in the system.

The exhaust gas 1 heated in the reheating process is heated in the furnace 5
It is introduced into the inside, mixed, burned by the flame of the burner 6 installed in the furnace 5, and further heated. When the temperature reaches a temperature at which the VOC self-combusts, the VOC can continue combustion even when the burner 6 is stopped, and the VOC is removed by the combustion.

The purified gas 7 from which VOCs have been removed in the furnace 5 heats the heat storage body in the course of passing through the heat storage chamber 3 (heat storage process), and is further discharged to the outside of the system via the rotary distributor 2. And in the heat storage type exhaust gas treatment device, VOC
Is designed to be burned and removed in the furnace 5, the maintenance of the gas temperature in the furnace is the most important factor in maintaining the VOC removal efficiency. Is maintained at a temperature of about 820 ° C.
Although not shown, a configuration may be adopted between the heat storage chamber 3 and the furnace 5 to arrange a combustion catalyst layer for catalytically burning the VOC-containing exhaust gas or the carbon-containing compound in the purified gas from the furnace 5. .

In FIG. 1, the VOC concentration in the exhaust gas 1 introduced into the exhaust gas treatment device has a different value depending on the product obtained by the manufacturing device if it is a manufacturing device for a product such as a chemical product. Even if it is the same product, exhaust gas 1
The VOC concentration in the inside fluctuates with the passage of time, and further, since the VOC-containing gas is not introduced into the manufacturing device when the product obtained by the manufacturing device is switched, the state in which the VOC concentration becomes minute continues temporarily.

The exhaust gas treatment apparatus shown in FIG. 1 presents a measure against such a case where the VOC concentration is extremely low. For example, an exhaust gas treatment device that can ensure the VOC removal efficiency when the VOC concentration rises after the completion of the manufacturing process switching, such as the manufacturing content in the manufacturing process on the upstream side of the exhaust gas treatment device, is presented. That is, the VOC concentration is measured by the commonly used VOC concentration measuring device 13 installed at the inlet of the exhaust gas treatment device, and when the measured value and the set temperature Ts are input to the determining device 9 of the control device 10, the VOC concentration is measured. When the concentration is very small, the control signal for determining the opening / closing degree of the fuel addition amount adjusting valve 11 to the burner 6 which is the output of the determining device 9 is set corresponding to the standby temperature. Otherwise, the control signal is determined based on the normal operation set temperature Ts.

The burner 6 is operated during the normal operation by the above control method.
FIG. 2 shows the result when VOC removal control is performed by using. 2 (a) shows the furnace gas temperature change when the burner 6 is used, FIG. 2 (b) shows the auxiliary fuel addition amount in that case, and FIG. 2 (c) shows the VOC removal efficiency. Figure 2
(D) shows the change in VOC concentration.

The control conditions are the same as those described with reference to FIGS. 6 and 7, and the set temperature Ts is set to 820 ° C. and the standby temperature is set to 650 ° C. For this setting, VOC
Between the time points A and B when the concentration becomes 10 ppm or less, the output signal of the judging device 9 corresponds to the standby temperature, that is, 650 ° C. Therefore, the burner 6 operates only when the furnace gas temperature becomes 650 ° C. or lower, and the furnace gas temperature is reduced to 65%.
Hold at 0 ° C.

As a result, the VOC after completion of the manufacturing process switching
Even when the concentration is increased, the decrease in VOC removal efficiency is very small, and the removal efficiency during normal operation can be maintained. Therefore, the temporary drop in VOC removal efficiency as shown in FIG. 6C in the case of the conventional technique is avoided. further,
Focusing on the amount of auxiliary fuel added in FIG. 2 (b), this is suppressed to a reduced value of about 30% of that in the case of the conventional technique shown in FIG. 7 (b).

The prior art control device 100 shown in FIG. 5 does not have the deciding device 9, and the burner 6 always starts operating when the furnace gas temperature falls below a predetermined temperature of 820 ° C.
When the control device 10 shown in FIG.
This is based on the difference that the operation of the burner 6 starts only when the temperature becomes 0 ° C. or less.

In the example shown in FIG. 1, the signal input to the determiner 9 is the VOC concentration measurement value, but it may be replaced with a process change signal in the upstream side, for example, in the manufacturing process shown in FIG. . The process change signal in the upstream manufacturing process makes it possible to judge when the manufacturing process is switched.
The same effect as when controlling based on the C concentration measurement value can be obtained.

[0032]

According to the present invention, the supply amount of the auxiliary combustion fuel to the burner at the upstream side of the exhaust gas treatment device, for example, when the manufacturing process is switched is controlled, and the concentration of the volatile organic compound is increased after the completion of the manufacturing process switching. Even at times, there is an effect that the removal efficiency of the volatile organic compounds can be secured.

[Brief description of drawings]

FIG. 1 is a flow chart of furnace temperature constant value control when a VOC concentration is input to a determiner according to an embodiment of the present invention.

FIG. 2 is a diagram showing a trend of a furnace gas temperature, an auxiliary combustion amount, and a VOC removal efficiency of the heat storage type exhaust gas treatment apparatus of the embodiment of the present invention.

FIG. 3 is a flow chart of furnace temperature constant value control when a process change signal is input to the determiner according to the embodiment of the present invention.

FIG. 4 is a conceptual diagram of a heat storage type exhaust gas treatment device.

FIG. 5 is a flow chart of furnace temperature constant value control of a conventional heat storage type exhaust gas treatment apparatus.

FIG. 6 is a diagram showing a trend of a furnace gas temperature, an auxiliary combustion amount, and a VOC removal efficiency of a conventional heat storage type exhaust gas treating apparatus.

FIG. 7 is a diagram showing a trend of a furnace gas temperature, an auxiliary combustion amount, and a VOC removal efficiency of a conventional heat storage type exhaust gas treating apparatus.

[Explanation of symbols]

1 VOC-Containing Exhaust Gas 2 Rotary Distributor 3 Heat Storage Chamber 5 Furnace 6 Burner 7 Purified Gas 8 Combustion Catalyst Layer 9 Judgment Device 10 Control Device 11 Fuel Addition Adjustment Valve 12 Purge Fluid Valve 13 VOC Concentration Measuring Device

Claims (8)

[Claims] 1. An inlet for introducing exhaust gas containing a volatile organic compound discharged from an exhaust gas generator, a furnace for burning the volatile organic compound introduced through the inlet together with a fuel for supporting combustion, and a furnace for the combustion. Is disposed between the outlet part for discharging the purified gas, the region forming the inlet part and the outlet part, and the furnace, and the volatile organic compound-containing exhaust gas from the inlet part and the purified gas from the furnace pass through. In the case of a heat storage type volatile organic compound-containing exhaust gas treatment apparatus having a heat storage chamber containing a heat storage body that transfers the heat of the purified gas to the volatile organic compound-containing exhaust gas, in the exhaust gas provided in the inlet portion The volatile organic compound concentration measuring means for measuring the concentration of the volatile organic compound, and the control of the combustion gas temperature in the furnace in accordance with the measurement value of the volatile organic compound concentration measuring means are set to the normal furnace operating temperature and Regenerative volatile organic compounds, characterized in that a combustion temperature control means for combusting the supporting fuel is switched to standby for temperature set lower combustion temperature than the normal operating temperature containing exhaust gas treatment apparatus. 2. When the measured value of the volatile organic compound concentration measuring means is less than or equal to a predetermined value, the combustion temperature control means performs combustion control so that the combustion gas temperature in the furnace becomes equal to the standby temperature, and the volatile property is maintained. When the measured value of the organic compound concentration measuring means is higher than a predetermined value, the combustion temperature control means controls combustion so that the combustion gas temperature in the furnace becomes equal to the operating temperature of the normal furnace. The heat storage type volatile organic compound-containing exhaust gas treatment device described. 3. An inlet part for introducing the volatile organic compound-containing exhaust gas discharged from the exhaust gas generator, a furnace for burning the volatile organic compound introduced from the inlet part together with a fuel for supporting combustion, and the furnace. Is disposed between the outlet part for discharging the purified gas, the region forming the inlet part and the outlet part, and the furnace, and the volatile organic compound-containing exhaust gas from the inlet part and the purified gas from the furnace pass through. In a heat storage type volatile organic compound-containing exhaust gas treatment device having a heat storage chamber that stores a heat storage body that transfers the heat of the purified gas to the volatile organic compound-containing exhaust gas, the exhaust gas generation amount of the exhaust gas generation device is related to Depending on the process change signal and the presence or absence of the signal, the control of the combustion gas temperature in the furnace is switched to the normal furnace operating temperature and the standby temperature set to the combustion temperature lower than the normal operating temperature. Serial regenerative volatile organic compound-containing exhaust gas treatment device characterized by comprising a combustion temperature control means furnace for combusting the supporting fuel. 4. When the process change signal related to the amount of exhaust gas generated from the exhaust gas generator is transmitted, the combustion temperature control means controls combustion so that the combustion gas temperature in the furnace becomes equal to the standby temperature, 4. The heat storage type volatility according to claim 3, wherein the combustion temperature control means controls combustion so that the temperature of the combustion gas in the furnace becomes equal to the operating temperature of the normal furnace when no process change signal is transmitted. Exhaust gas treatment equipment containing organic compounds. 5. A volatile organic compound-containing exhaust gas discharged from an exhaust gas generator is passed through a heat storage body, and then burned in a furnace with a fuel for auxiliary combustion to form a purified gas, and the purified gas is stored in the heat storage body. In a heat storage type volatile organic compound-containing exhaust gas treatment method of passing through and preheating the volatile organic compound-containing exhaust gas through a heat storage body, the concentration of the volatile organic compound in the exhaust gas introduced into the furnace is measured, and the volatile organic compound concentration is measured. According to the measured value of the compound concentration, control of the combustion gas temperature in the furnace is switched to the normal furnace operating temperature and the standby temperature set to a combustion temperature lower than the normal operating temperature, and the auxiliary fuel is burned. A method for treating exhaust gas containing a heat storage type volatile organic compound. 6. When the measured value of volatile organic compound concentration is below a predetermined value, combustion control is performed so that the combustion gas temperature in the furnace becomes equal to the standby temperature, and the measured value of volatile organic compound concentration is a predetermined value. When the temperature is higher, combustion control is performed so that the temperature of the combustion gas in the furnace becomes equal to the operating temperature of the normal furnace, and the heat treatment type volatile organic compound-containing exhaust gas treatment method according to claim 5. 7. A volatile organic compound-containing exhaust gas discharged from an exhaust gas generator is passed through a heat storage body, and then burnt in a furnace together with a fuel for auxiliary combustion to form a purified gas, and the purified gas is stored in the heat storage body. In a heat storage type volatile organic compound-containing exhaust gas treatment method of preheating a volatile organic compound-containing exhaust gas through a heat storage body, a process change signal related to the exhaust gas generation amount of the exhaust gas generator and the presence or absence of the signal Storage type volatile organic compound characterized by switching the control of the combustion gas temperature in the furnace to a normal furnace operating temperature and a standby temperature set to a combustion temperature lower than the normal operating temperature to burn the auxiliary combustion fuel. Exhaust gas treatment method. 8. When a process change signal relating to the amount of exhaust gas generated from the exhaust gas generator is transmitted, combustion control is performed so that the combustion gas temperature in the furnace becomes equal to the standby temperature, and a process change signal is transmitted. If there is no such, the combustion control is performed so that the temperature of the combustion gas in the furnace becomes equal to the operating temperature of the normal furnace, and the heat treatment type volatile organic compound-containing exhaust gas treatment method according to claim 7.