JP3332527B2 - Indirect heating type paint drying oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indirect heating type in which a zone in a furnace is heated by exchanging heat between high-temperature combustion exhaust air and air in the zone in the furnace zone.
Related to painting drying furnace, for more information, as the furnace zone ventilation,
While discharging the air in the zone from the furnace zone to be adjusted to the target zone temperature at a predetermined exhaust air volume to the outside of the system, and introducing fresh air for ventilation to the furnace zone at a predetermined air supply air volume,
The furnace with the zone ventilation relates to an indirect heating type paint drying furnace for incineration at a predetermined incineration temperature by the combustion device the zone air discharged from the system at a predetermined exhaust air volume.

[0002]

2. Description of the Related Art An indirect heating type coating / drying furnace heats the furnace zone without bringing combustion exhaust into the furnace zone, and is therefore a direct heating type coating / drying furnace which heats the furnace zone by introducing combustion exhaust. Compared to the operation of the indirect heating type paint drying furnace, as shown in FIG. For each of the in-furnace zones Z, the external circulation air passage 4 of the in-zone air A, and
A zone-temperature-adjusting heat exchanger N1 for exchanging heat between the circulating air A in the external circulation air passage 4 and the combustion exhaust gas G sent from the zone-temperature-adjusting combustion apparatus Ba is provided. And adjusts the combustion amount of the zone temperature adjusting combustion device Ba based on the detection information of the in-zone air temperature in each in-furnace zone Z (in other words, heat exchange in the zone temperature adjusting heat exchanger N1). Thus, the zone temperature of each in-furnace zone Z was adjusted to the respective target zone temperature tz.

[0003] In addition, as in-furnace zone ventilation performed in parallel with the zone temperature adjustment, the in-zone air Ae is derived from each in-furnace zone Z from the derived air path 5 at a predetermined exhaust air volume qe for each in-furnace zone. , These derived zone air Ae
(That is, the air to be treated including the paint solvent vapor) to a common incineration combustion device Bb to be subjected to a predetermined incineration temperature tb.
While the fresh air OA for ventilation (generally outside air) is supplied to the introduction air passage 3 connected to each of the external circulation air passages 4 at a predetermined supply air volume qo for each furnace zone (generally, for each furnace zone). (The air volume equal to the predetermined exhaust air volume qe) is supplied to each in-furnace zone Z, and the processed combustion exhaust gas Ge sent from the incineration combustion device Bb to the exhaust air passage 2 is supplied to the heat exchanger N2. After the preheating of the air Ae introduced into the combustion device Bb for incineration in (in some cases, the preheating is followed by the use of another heat exchanger for heating the fresh air for ventilation OA), the entire amount is It was discharged outside the system.

[0004] And in the conventional indirect heating drying furnace
Are fixed heat transfer walls as the heat exchangers N1 and N2.
A fixed heat exchanger that exchanges heat between gases through
Was used.

In the drawing, Fc is a circulation fan also serving as a fresh air introduction fan, and Fa is a zone temperature adjusting combustion device Ba.
, Fe is an exhaust fan, f is a filter, S is a catalyst layer, and the exhaust fan Fe is operated at a constant air volume equal to the sum Σqe of the predetermined exhaust air volume qe for each furnace zone.

[0006]

SUMMARY OF THE INVENTION However, the conventional
Since it is necessary to separately equip the in-furnace zone Z with a combustion device Ba for adjusting the zone temperature in each of the in-furnace zones Z and additionally provide a combustion device Bb for incineration treatment, The required number of combustion equipments is large, which increases the equipment cost and equipment space, complicates maintenance management for the combustion equipment, and complicates the control configuration for the combustion equipment.

[0007] Incidentally, eliminating the combustion device Ba for zone temperature control in a conventional drying oven of the, This ensures that, as another method of reducing the required number equipped combustion apparatus as a whole, each furnace zone Z Heat of the combustion exhaust Ge discharged from the incineration combustion device Ba to the outside by recovering heat from the ventilation fresh air OA supplied to the combustion device and the combustion exhaust gas Ge sent from the incineration combustion device Bb. The recovered heat is distributed and supplied to each furnace zone Z. In this configuration, the zone temperature of each furnace zone Z is adjusted to the target zone temperature tz by adjusting the distribution amount of recovered heat to each furnace zone. It is conceivable to omit the combustion device Ba for zone temperature adjustment by adjusting the temperature. However, in this case, the in-furnace zone Z is set to the target zone temperature tz (for example, from the state where the furnace and the in-furnace zone Z are at room temperature). 1 (Approximately 0 ° C.), the start-up time required to elevate the temperature is extremely long, and the operating time of the coating material drying operation performed at the target zone temperature tz after the start-up is greatly limited. Occurs.

That is, the flow rate of the zone air Ae discharged from each furnace zone Z to the outside of the system and the flow rate of the fresh air OA introduced into each furnace zone Z are determined by the paint solvent vapor in each furnace zone Z. The appropriate predetermined airflow qe,
qo, and even if the air volume of the in-zone air Ae discharged from each in-furnace zone Z to the outside of the system can be changed and adjusted, the supply and exhaust balance of each in-furnace zone Z (in other words, zone It is difficult to appropriately change and adjust the air volume of the in-zone air Ae discharged from each in-furnace zone Z to the outside of the system because it is necessary to stably maintain the internal pressure). In the processing mode in which the discharged combustion exhaust Ge passes through the catalyst layer S, the amount of the combustion exhaust Ge passed is defined in order for the catalyst layer S to act stably. In the above-described conventional embodiment, the in-zone air Ae is incinerated by the incineration combustion device Bb, and the entire amount of the combustion exhaust gas Ge discharged from the incineration combustion device Bb is discharged out of the system. In Bb Processing air volume is defined to a certain amount.

[0009] The combustion apparatus B for incineration treatment as described above.
In addition to the processing air volume in b being regulated to a certain amount, the incineration temperature in the incineration combustion device Bb is stable with the heat-resistant surface of the incineration device and the air Ae containing paint solvent vapor in a state of good thermal efficiency. In the aspect of incineration treatment, and in the form of passing the combustion exhaust Ge through the catalyst layer S, the temperature is also limited to a predetermined temperature tb in terms of the heat resistant surface of the catalyst and the surface in which the catalyst acts stably. From this, the incineration combustion system B
b, the amount of combustion in the furnace zone b is defined. Therefore, the combustion apparatus Ba for adjusting the zone temperature is omitted, and the heat recovery from the combustion exhaust Ge is distributed and supplied to the respective furnace zones Z. In the above alternative method of raising the temperature of Z, it takes an extremely long startup time to raise the temperature of each in-furnace zone Z to the target zone temperature tz.

[0010] In addition, the heat exchanger N1 for zone temperature adjustment
With a conventional indirect heating type paint drying oven using a fixed heat exchanger
Is because the heat capacity of the fixed heat exchanger N1 is large.
The amount of combustion of the burner Ba
However, the temperature of the circulating air A sent from the heat exchanger N1 is moderate.
It changes only slowly, and therefore, in terms of responsiveness and accuracy
Zone temperature adjustment function is low and limited, paint drying quality
There was a problem that became low.

An object of the present invention is a paint drying furnace of an indirect heating type, without prolonged start-up time, as well as allowing a reduction in combustion apparatus equipped number, the furnace zone
The point is to effectively enhance the temperature control function .

[0012]

A first characteristic configuration of the indirect heating type coating and drying oven according to the present invention is as follows.
While discharging the air in the zone from the furnace zone to be adjusted to the target zone temperature at a predetermined exhaust air volume to the outside of the system, and introducing fresh air for ventilation to the furnace zone at a predetermined air supply air volume,
Along with this in-furnace zone ventilation, in order to carry out a basic configuration in which the in-zone air discharged to the outside at a predetermined exhaust air volume is burned at a predetermined incineration temperature by a combustion device, the air in the zone of the furnace zone is system-burned. In the configuration in which the combustion device is interposed in an air passage to be discharged to the outside, the processed combustion exhaust gas discharged from the combustion device is discharged to the outside at a predetermined exhaust air flow rate, and a device through a loop air passage. the combustion apparatus of the sink as a binary refluxing the air introduction side, with adjusting the amount of combustion wherein the incineration temperature in the combustion device so as to maintain a predetermined incineration temperature of the combustion device, constituted by permeable heat storage material
Between the loop air passage and the air passage in the zone.
The rotary heat exchanger that rotates in a rotating state
Exhaust in the loop air path and inside the furnace zone
Heat exchange with air, in the form with the combustion amount adjustment,
The amount of heat exchange in the rotary heat exchanger is determined by the rotational speed of the rotor.
By adjusting drives out degree adjustment, structure for adjusting the zone temperature in the furnace zone to the target zone temperature
It is in the point that it is formed .

The second embodiment of the indirect heating type coating and drying oven according to the present invention .
The characteristic configuration specifies a preferable specific configuration in the implementation of the first characteristic configuration, and the combustion device, the loop air path, and The above-mentioned rotary heat exchangers are separately provided, and each of the in-furnace zones is independently adjusted by the above-described rotor rotation speed adjustment in a form accompanied by the above-mentioned combustion amount adjustment .
That the heat exchange amount adjusting to implement, in that the zone temperatures of the respective furnace zones are a configuration to adjust the target zone temperatures of each.

[0014]

That is, in the first characteristic configuration, the combustion exhaust gas sent from the combustion device is divided into a device for discharging the combustion exhaust to the outside of the system and a device for returning the combustion exhaust gas to the air introduction side of the combustion device through a loop air passage. By performing heat exchange between the recirculated combustion exhaust gas in the loop air passage and the air in the zone of the furnace zone by a rotary heat exchanger , the furnace zone is heated in a so-called indirect heating mode. The combustion device is used as both a combustion device for incineration and a combustion device for zone temperature adjustment.

[0015] Then, the amount of heat exchange in the rotary heat exchanger, the rotation speed adjustment of the rotor in the rotating heat exchanger
Thus, the heating amount for the furnace zone is adjusted to adjust the zone temperature of the furnace zone to the target zone temperature.

When the above-mentioned heat exchange amount is adjusted, the amount of heat retained in the combustion exhaust returning to the air introduction side of the combustion device also changes, but the incineration temperature in the combustion device is reduced to a predetermined incineration temperature. (I.e., the above-mentioned heat exchange amount adjustment is performed in a form involving the adjustment of the combustion amount) so that the air in the zone discharged from the furnace zone to the outside of the system via the combustion device is adjusted. The treatment is surely performed at a predetermined incineration temperature, and the temperature of the combustion exhaust gas as a furnace zone heating medium diverted to the side of the loop air passage is maintained at a constant temperature.

Further, the amount of air passing through the combustion device does not match the amount of exhaust air of the zone air discharged from the furnace zone to the outside of the system, and is the sum of the amount of exhaust air and the amount of recirculating air in the loop air passage. The combustion exhaust that is diverted to the side of the loop air path in the diverted stream is recirculated to the air introduction side of the combustion device. Therefore, in the above-mentioned branch flow, the combustion exhaust gas discharged from the combustion device is discharged out of the system at a predetermined exhaust air amount, and the exhaust gas is returned to the air introduction side of the combustion device via a loop air passage. As a result, the air volume of the zone air discharged from the furnace zone to the outside of the system can be maintained at a predetermined exhaust air volume regardless of the recirculation air volume in the loop air path. Definitive supply and exhaust balance (ie,
It is possible to stably maintain the balance between the fresh air for ventilation introduced into the furnace zone at a predetermined supply air flow rate and the air in the zone discharged from the furnace zone to the outside of the system, in other words, the zone internal pressure). it can.

In a second characteristic configuration, the combustion device, the loop air passage, and the rotating
Configuration equipped with the formula heat exchanger to each other, performing a first characteristic configuration of the independently for each of these furnace zone.

[0019]

According to the first characteristic configuration of the present invention, the required number of combustion devices can be reduced since the combustion device is used as both the combustion device for incineration and the combustion device for adjusting the zone temperature. This can reduce equipment costs and equipment space, facilitate maintenance and management of the combustion devices, and simplify the control configuration for the combustion devices.

In addition, since the temperature adjustment of the furnace zone is performed by adjusting the heating amount of the furnace zone in a form involving the adjustment of the combustion amount of the combustion device, the number of equipment of the combustion device is reduced as described above. The time required for the start-up operation for raising the temperature in the furnace zone to the target zone temperature can be shortened, and thereby, the operation of the coated material drying operation performed after the start-up can be performed advantageously. .

Furthermore, the air volume of the zone air discharged from the furnace zone to the outside of the system can be stably maintained at a predetermined exhaust air volume, and the supply / exhaust balance (zone internal pressure) in the furnace zone is stably kept constant. By maintaining the condition, it is possible to stably prevent inappropriate air inflow and outflow between the furnace zone and the outside, and the occurrence of inappropriate airflow between the furnace zones, thereby improving the coating drying quality. obtain.

[0022] Furthermore, a rotor composed of a permeable heat storage material
Over the loop air passage and the air passage in the zone
By rotating it, zoning from the combustion exhaust in the loop
If it is a rotary heat exchanger that transfers heat to the air in the
Heat exchange capacity required by increasing the area of the fixed heat transfer wall
The equipment has a smaller heat capacity than a fixed heat exchanger
It is possible to obtain high heat exchange capacity while making it compact
The temperature of the air in the zone discharged from the heat exchanger
The degree of change by adjusting the rotor speed.
As a result, the temperature adjustment function of the furnace zone
It is possible to effectively improve the response and accuracy,
This can improve the quality of paint drying.
Also, the space required for installing the heat exchanger should be small.
Can be.

According to a second characterizing feature of the present invention, by carrying out individually for independent of the plurality furnace zones a first characteristic configuration of adjusting the zone temperature in the furnace zone to a target zone temperature And maintaining the air volume discharged from the furnace zone to the outside of the system at a predetermined exhaust air volume (that is, maintaining the supply / exhaust balance of the furnace zone) by avoiding mutual interference between the furnace zones. Thus, it is possible to perform the operation accurately and stably for each furnace zone. In addition,
Some of the furnace zones that are
Operation without affecting the operation of other furnace zones
It is also possible to stop it, and in this regard
Performance can also be enhanced.

[0024]

Next, an embodiment will be described with reference to FIG.

Reference numeral 1 denotes a tunnel-shaped furnace body in an indirect heating type coating / drying furnace, in which a plurality of furnace zones Z are set in the furnace in such a manner that they are arranged in the conveying direction of a coating material X (in this example, an automobile body). is there.

In each furnace zone Z, the zone temperature is adjusted and maintained at a target zone temperature tz (for example, about 170 ° C.) by heating, and a paint solvent vapor is generated in the zone when the coating material X is dried. Against the air in the zone Ae (Ge)
At a predetermined exhaust air volume qe for each furnace zone Z.
The fresh outside air OA for ventilation which is exhausted from the system through the outside air introduction air passage 3 through the outside air inlet 3 is supplied to each furnace zone Z at a predetermined supply air volume qo (qo = qe in this example) for each furnace zone Z. Ventilation in the furnace zone supplied to the furnace.

In the in-furnace zone ventilation, the in-zone air Ae (ie, air containing paint solvent vapor) discharged outside the system at a predetermined exhaust air volume qe is supplied to the combustion device B at a predetermined incineration temperature tb (for example, 300 ° C.). ), Followed by passing through the catalyst layer S to perform a catalytic reaction process, thereby discharging the combustion exhaust Ge that has been made non-polluting out of the system.

The above-mentioned zone temperature control, furnace zone ventilation,
In addition, the exhaust gas treatment outside the system is performed independently for each furnace zone Z with the same operation method by the equipment having the same configuration equipped for each furnace zone Z. Hereinafter, one furnace zone Z Regarding Z, these equipment configuration and operation method will be described.

Reference numeral 4 denotes an external circulating air passage for circulating the air A in the zone for equalizing the state of air in the zone, and reference numeral 5 denotes an outgoing air passage for leading out the air Ae in the zone discharged to the outside of the system and leading it to the combustion device B. , 6 is a delivery air passage for guiding the treated combustion exhaust gas G sent from the combustion device B to the catalyst layer S, and 7 is a combustion air Gr which is diverted from the delivery air passage 6 and returned to the outlet air passage 5 (that is, the combustion device B). The furnace zone Z includes the combustion exhaust gas Gr in the loop air path 7.
Heat exchange between air and circulating air A in external circulation air passage 4
The target zone temperature tz is heated by heat exchange in the vessel Na .

The above-mentioned outside air introduction air passage 3 is a rotary heat exchanger.
The upstream side of the exchanger Na is connected to the external circulation air passage 4.

Fc is a circulating fan interposed in the external circulating air passage 4, Fb is an outlet fan interposed in the outlet air passage 5, Fe is an exhaust fan interposed in the exhaust air passage 2, and the circulating fan Fc is
By being interposed in the external circulation air path 4 at a position downstream of the connection portion of the external air introduction air path 3, the circulation of the air A in the zone and the introduction of the external air from the external air introduction air path 3 are performed, and the derivation fan Fb Is installed at a position downstream of the connection part of the loop air path 7 in the outlet air path 5, so that the in-zone air Ae is taken out of the furnace zone Z to the outlet air path 5, The combustion exhaust gas is recirculated from all the delivery air paths 6 to the outlet air path 5.

The circulating fan Fc performs a constant air volume operation at a predetermined circulating air volume qc, and the exhaust fan Fe performs a constant air volume operation at the aforementioned predetermined exhaust air volume qe.
The derived fan Fb operates at a predetermined airflow at a predetermined recirculation induction airflow qb (qb> qe) larger than the predetermined exhaust airflow qe.

That is, in the configuration in which the loop air path 7 is provided, the blowing amount qb of the outlet fan Fb is
By setting the air flow amount e to be larger than the air flow amount qe, the combustion exhaust gas is recirculated from the delivery air passage 6 to the derived air passage 5 through the loop air passage 7 as described above, and thereby the delivery from the combustion device B is performed. The combustion exhaust G to be discharged through the catalyst layer S and the exhaust air passage 2 to the outside at the predetermined exhaust air volume qe, and the outlet air passage 5 through the loop air passage 7 (the air introduction side of the combustion device B). ) And a form that diverges into a reflux.

The air volume (qb-qe) obtained by subtracting the air volume qe of the exhaust fan Fe from the air volume qb of the derived fan Fb (that is, the air volume passing through the combustion device B) is supplied from the loop air channel 7 by the above-described split flow. Since the amount of combustion exhaust air is recirculated to the introduction air passage 5, the amount of air exhausted from the furnace zone Z, discharged through the incineration treatment and passing through the catalyst layer, and discharged outside the system is maintained at the above-described predetermined exhaust air amount qe. It is.

The rotating heat exchanger Na said has a rotor r constituted by permeable heat storage material, is rotated in a state in which span the rotor r to the loop-like path 7 and the external air circulation duct 4 As a result, heat exchange between the combustion exhaust Gr in the loop air passage 7 and the circulating air A in the external circulation air passage 4 is performed, and the rotation speed of the rotor r is changed and adjusted, so that the combustion exhaust Gr in the loop air passage 7 is changed. The amount of heat exchange per unit time with the circulating air A in the external circulation air passage 4 is changed to adjust the temperature of the furnace zone Z.

The furnace zone temperature control zones Z is carried out with a rotational speed adjustment of the rotor r in the above <br/>如rather rotating heat exchanger Na, but for this, is delivered from the combustion device B Incineration temperature sensor for detecting the temperature of combustion exhaust G
1, and zone air A taken out of the furnace zone Z
e, that is, a zone temperature sensor s2 for detecting the temperature of the incinerator zone Z, and the combustion apparatus B adjusts and maintains the incineration temperature at the predetermined incineration temperature tb. the combustion amount is automatically adjusted by the controller based on the detection information s1, thereby, the above-described rotary
Regardless of a change in the amount of heat retained in the air introduced into the combustion apparatus due to the adjustment of the amount of heat exchange in the heat exchanger Na, the incineration of the air Ae in the zone discharged to the outside of the system is ensured at a predetermined incineration temperature tb. The temperature of the combustion exhaust gas Gr which is recirculated to the loop air path 7 as the heating medium in the zone Z and passed through the rotary heat exchanger Na is maintained at a constant temperature.

[0037] Then, in the automatic adjustment of a combustion amount, the rotor r is the rotation heat exchanger Na, to adjust and maintain the zone temperature with the heat exchange amount adjusting to the target zone temperature tz, zone temperature sensor The rotation speed is automatically adjusted by the controller based on the detection information of s2.

In brief, the operation of the indirect heating type coating / drying furnace in the present embodiment is based on a configuration in which the combustion device B is interposed in the air paths 5 and 2 for discharging the air Ae in the furnace zone Z to the outside of the system. The exhausted treated combustion exhaust gas G sent out from the combustion device B is discharged out of the system at the predetermined exhaust air volume qe, and the exhaust gas is returned to the air introduction side of the combustion device B via the loop air passage 7. To the combustion device B so that the incineration temperature in the combustion device B is maintained at the predetermined incineration temperature tb.
While adjusting the combustion amount, rotating the zone air A combustion exhaust Gr and furnace zone Z in the loop air path 7
The heat is exchanged by the heat exchanger Na , and the rotary heat is adjusted by adjusting the rotation speed of the rotor in a form involving adjustment of the combustion amount.
The zone temperature in the furnace zone Z is adjusted to the target zone temperature tz by adjusting the heat exchange amount in the exchanger Na .

In the figure, Nb represents the combustion exhaust gas Ge discharged to the outside of the system and the introduced outside air OA by rotating the rotor r 'while passing the exhaust air passage 2 and the outside air introduction passage 3.
Is a rotary heat exchanger that heat-exchanges and heats the introduced outside air OA.

In the figure, f is a filter, and Do is a damper for adjusting the amount of outside air introduced.

Another Embodiment Next, another embodiment will be described.

( 1 ) The equipment configuration for adjusting the combustion amount of the combustion device B so as to maintain the incineration temperature in the combustion device B at the predetermined incineration temperature tb can be variously changed.

( 2 ) In the above-described embodiment, the combustion apparatus B is separately provided for each of the plurality of in-furnace zones Z, and the temperature of the zone is independently adjusted for each of the in-furnace zones Z, and the out-of-system discharge is performed. Although the embodiment in which the incineration of air is performed has been described, in the practice of the present invention, a plurality of different rotary heat
The present invention may be implemented in a configuration in which a common combustion device B is equipped with the exchanger Na, and the individual air volume adjustment of the in-zone air Ae sent from each in-furnace zone Z to the combustion device B is performed. .

( 3 ) The predetermined exhaust air volume qe discharged from the furnace zone Z to the outside of the system and the predetermined supply air volume qo of fresh air OA introduced into the furnace zone Z are appropriately changed within an allowable range. For example, a configuration may be provided in which a control unit that synchronously changes and adjusts the predetermined exhaust air volume qe and the predetermined supply air volume qo in response to a change command is provided.

[0045] (4) the coated article X of the drying target is not limited to the automobile Bo de I <br/> over, the present invention provides paint drying furnace of an indirect heating type to be dried to various coated product Applicable to

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional example.

[Explanation of symbols]

tz Target zone temperature Z Furnace zone Ae Zone air qe Predetermined exhaust air volume OA Ventilation fresh air qo Predetermined air supply volume B Combustion device tb Predetermined incineration temperature 5, 2 Air exhaust air channel in zone G Combustion exhaust 7 Loop air channel Ge Reflux combustion exhaust Na rotary heat exchanger

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F26B 25/00 F26B 21/04 F26B 21/10 F27D 17/00

Claims (2)

(57) [Claims] 1. In-furnace zone ventilation, air in a zone (Ae) is discharged from a furnace zone (Z) which is adjusted to a target zone temperature (tz) out of the system at a predetermined exhaust air volume (qe). In the furnace zone (Z), fresh air (O
A) is introduced at a predetermined supply air volume (qo), and the zone air (Ae) discharged outside the system at a predetermined exhaust air volume (qe) is ventilated by the combustion device (B) with the ventilation of the furnace zone. An indirect heating type coating and drying furnace for incineration at an incineration temperature (tb), wherein the air (Ae) in the zone of the furnace zone (Z) is discharged to the outside of the system. A device for interposing the device (B), for discharging the treated combustion exhaust gas (G) sent from the combustion device (B) to the outside at a predetermined exhaust air volume (qe); (7) and a refrigerant circulated to the air introduction side of the combustion device (B), and the combustion device (B) is maintained at the predetermined incineration temperature (tb). In addition to adjusting the combustion amount of (B), a low
(R) is connected to the loop air passage (7) and the air in the zone (A).
Heat exchange that rotates while spanning the wind path (4)
Exchanger (Na) allows fuel to flow in the loop air passage (7).
Burning exhaust gas (Gr) and air in the furnace zone (Z)
(A) and heat exchange with the rotary heat exchanger in a mode involving the combustion amount adjustment .
The amount of heat exchange in (Na) is adjusted by adjusting the rotation speed of the rotor (r).
The furnace zone (Z)
An indirect heating type coating / drying oven configured to adjust the zone temperature in the above to the target zone temperature (tz) . 2. The combustion device (B), the loop air passage (7), and the rotary heat exchange for each of a plurality of furnace zones (Z) juxtaposed in the conveying direction of the coating object (X). Container (N
a) is separately equipped, and the rotational speed of the rotor (r) is independently controlled for each of the in-furnace zones (Z) in the form with the combustion amount adjustment.
The indirect heating type coating / drying furnace according to claim 1, wherein the heat exchange amount is adjusted by adjusting the zone temperature of each furnace zone (Z) to each target zone temperature (tz) .