JPS6150670A - Method and apparatus for controlling atmosphere of paint drying and baking furnace - Google Patents

Abstract

PURPOSE:To reduce the consumption of fuel, by calculating the use amount of fuel used in an incinerator from a theoretical solvent evaporation amount, the amount of a furnace exhaust gas and the temp. of said furnace exhaust gas. CONSTITUTION:The use amount of fuel used in an incinerator 8 is calculated from the theoretical solvent evaporation amount in a drying and baking furnace 6, the amount of the furnace exhaust gas from the drying and baking furnace 6 incinerated in the incinerator 8, the temp. of said gas and combustion temp. The amount of the furnace exhaust gas is controlled so as to make said use amount of fuel constant. By this method, the consumption of fuel in the incinerator is reduced.

Description

[Detailed Description of the Invention] "Industrial Application Field" - The invention relates to an atmosphere control method and device for a paint drying and baking oven, and in particular, to prevent organic solvents in paint from exploding in the drying and baking oven. The present invention relates to a method and apparatus for controlling the amount of exhaust gas from a continuous drying and baking furnace for paint, and is used in the field of continuous drying and baking of one-color steel plates and the like.

[Conventional technology]

Conventionally, continuous drying and baking equipment for paint has been used to prevent evaporated solvent gas from the paint generated by heating the strip from exploding in the drying and baking oven.
The amount of furnace exhaust gas from the drying and baking furnace is controlled in order to keep the temperature below the set value of the lower explosive limit determined by the oxygen turbidity of the atmospheric gas in the drying and baking furnace. A typical example thereof is proposed in Japanese Patent Laid-Open No. 58-1, 24113. An example of this method will be explained with reference to FIG.

The strip is coated with paint using a 2-it coater roll 4 and passed through a drying and baking oven 6. In the drying and baking furnace 6, a part of the incineration exhaust gas from the incinerator 8 is received via a return gas pipe 10, a flow rate control valve 12, and a blower 14, and is used as a heat source for drying and baking the paint. The remaining incineration exhaust gas discharged from the incinerator 8 is connected to the output path 16.
A heat exchanger 18 is provided. Furnace exhaust gas from the drying and baking furnace 6 is supplied to the incinerator 8 through the furnace l'J1-gas piping 20, blower 22, heat exchanger 18, flow control valve 24, and flow meter 26. In addition, the incinerator 8 has a combustion 1
41 Air 2871IS is supplied through the flow control valve 30, fuel 32 is supplied through the flow 11i control valve 34 and burned in the bar 36, and the solvent contained in the furnace exhaust gas supplied from the drying and baking furnace 6. Incinerate evaporated gas. A part of the incinerator lid gas from the incinerator 8 is supplied to the drying and baking furnace 6 as described above, and the remaining part is discharged into the atmosphere from the chimney 38 after exhaust heat is recovered in the heat exchanger 18.

The theoretical solvent evaporation amount and the in-furnace solvent JAJ degree setting value of the drying and baking furnace 6 are input to the central control device 40 . The theoretical solvent evaporation amount is determined from the coating amount of the coater roll 4 and the solvent content, etc. The coating amount is determined from the coating film thickness, roll gap, line speed, etc., and the theoretical solvent evaporation amount is centrally controlled moment by moment. The amount of Hg is input to the system # 40 and compared with the solvent concentration set value, and the amount of furnace exhaust gas to be sent to the incinerator 8 is adjusted to Hg by the control valve 24 via the controller 42 . Note that this adjustment is carried out by a signal from the flow meter 26. Further, the central control device 40 supplies combustion air 28 and fuel 32 suitable for incineration of the furnace exhaust gas to the burner 36.
The air stoichiometric control valve 30 is controlled via the oxygen concentration indicator controller 44 to supply the oxygen, and the fuel amount control valve 34 is controlled via the temperature indicator controller 46. In addition, the oxygen detector 48 and temperature detector 50 provided in the incineration exhaust gas discharge path 16 of the incinerator 8 detect oxygen M1 and temperature, respectively, and in addition to the first detection of these, the in-furnace solvent MI of the drying and baking furnace 6 is detected in advance.
&, the air flow rate control valve 30 and the fuel amount control valve 34 are finely adjusted by comparing the set values determined depending on the type of paint, etc. That is, the furnace 111 gas from the drying baking furnace 6 supplied to the incinerator 8, the theoretical solvent evaporation amount from the paint applied with the coater roll 4 as described above, and the in-furnace solvent 7i14' of the drying baking furnace 6 drying from the setting candy. Although the amount of furnace tIIl gas from the baking furnace 6 is controlled, such a conventional control method has the following drawbacks.

(A) When the line is stopped, the in-furnace solvent evaporation gas steepness of the drying and baking furnace 6 decreases to a minimum, so the amount of fuel used by the incinerator 8 is reduced by 3 to 30% compared to the amount of fuel used by the incinerator 8 when the line is in operation. Increased by 4 times. In particular, in a high-mix, low-volume production line, the operating rate of the line may be around 50% due to color changes, test cooling, handling thickness changes, etc., and the average amount of fuel used by the incinerator 8 increases.

However, in the actual operation of the drying and baking furnace 6, the in-furnace gas of the drying and baking furnace 6 containing solvent evaporation gas is primarily discharged from the inlet and exit of the drying and baking furnace 6, and a part of the incineration exhaust gas of the Incine Lake 8 is also used for drying and baking. This lid gas is used in furnace 6, but the acid Jg
l! Since the i1 degree is low, depending on the fuel used in the incinerator 8, the quality of the coating may be poor, and condensation in the early stage of drying may cause quality problems such as uneven paint color. It is necessary to heat the product above the dew point. As a result, after coating with coater roll 4, drying baking oven 6
Since the temperature of the strip 2 decreases in the space before it enters, there are problems such as evaporation of volatile power. Since the amount of solvent combusted in the incinerator 8 decreases by the amount of increase in the amount of volatile evaporation, there is a drawback that the amount of fuel consumed in the incinerator 8 increases.

[Problem that the invention seeks to solve]

An object of the present invention is to provide an atmosphere control method and apparatus for a paint drying and baking oven that can solve all of the problems of the prior art, such as increased fuel consumption in incinerators, and reduce the fuel consumption of incinerators. It is on offer.

[Means for solving problems]

The gist of the method of the present invention for achieving the above object of the present invention is as follows. In other words, in the continuous drying and baking method for paint, in which the treated material with the paint adhered to it is passed continuously through a drying and baking furnace, and the generated furnace exhaust gas is guided to an incinerator to incinerate the solvent evaporation gas contained therein. The amount of fuel used in the incinerator is determined from the theoretical amount of solvent evaporation in the baking furnace, the furnace exhaust gas from the drying baking furnace that is incinerated in the incinerator, the temperature of the furnace exhaust gas from the drying baking furnace that is incinerated in the incinerator, and the combustion temperature of the incinerator. The paint is characterized by controlling furnace exhaust gas from a drying and baking furnace incinerated by an incinerator so that the amount of fuel used for one reuse in the incinerator remains constant regardless of the amount of solvent burned in the incinerator. This is a method of controlling the atmosphere of a drying and baking furnace.

Next, the method of the present invention described above can be effectively used to obtain Mg using the present J6 light apparatus described below.

That is, the first device of the present invention is capable of evaporating the bath agent contained in the treated material by continuously placing the treated material to which the plant charge has been attached in a drying and baking furnace and guiding the furnace exhaust gas generated at that time to an incineration lake. In the prefecture-based continuous drying and baking equipment that incinerates gas, there is a furnace exhaust gas temperature detection unit that detects the temperature of the furnace exhaust gas supplied to the Aftft cinerator, and an Aftft fin cinerator that adjusts the amount of fuel supplied to burn it. A first flow lid adjustment tank, a second flow lid adjustment tank that adjusts the amount of furnace exhaust gas supplied to the incinerator lake'/f:A, a temperature detection value of the forward bending furnace exhaust gas temperature detection section, and a temperature detection value in the drying and baking furnace. calculating the amount of fuel used by the incinerator based on each of the theoretical solvent evaporation amount, the calorific value of the solvent, the solvent concentration setting value in the drying and baking furnace, and the combustion temperature setting value of the previous incinerator; control &1e, 1 for flow rate instruction adjustment for controlling the first flow rate control valve based on the calculation result of the bundle control device and the detected value of the fuel flow, and the concentration 'rttll;
The performance value obtained by the device 6, the combustion temperature in the incinerator, and the temperature of the incinerator, γL.
The atmosphere of the paint drying and baking furnace is characterized by a furnace joint scum elongation section that controls the second ++te +Ii adjustment 1u1] for each of the first shift of ff rescum detection, and an electric equipment vlJ nozzle. [!口A1汀1] At the 11th reading [F].

In addition, 42-41: Yumei equipment (■) continuously passes the treated material fully coated with paint through a 1' furnace to dry it, and uses the incinerator to blacken the furnace gas generated at that time. J
Continuous drying and baking of paint to dispose of All vapor source gas.
L, 6 Furnace F gas temperature detection unit that determines the temperature of the furnace exhaust gas, and the flow control unit 1 (4 sho) that adjusts the supply of fuel to be combusted in the incinerator, and the incinerator LLl: Second VTE that adjusts the furnace exhaust gas to be supplied.
*tfl IIi]-n and +l'1Jfte 3 to adjust the amount of heated air supplied to the inflator
0 flow pre-regulating valve, the temperature detection value of the furnace exhaust gas detection unit, the theoretical FD agent evaporation rate in the drying and baking furnace, the calorific value of the bath all, the bath agent value in the drying and baking furnace, the above 71L
a central control device that calculates the fuel usage savings (l-7'ilT) required by the incinerator based on each of the flow rate and temperature of the hot air and the combustion temperature set value of the incinerator;
Operation W of the central control device 6: Based on the result, the flow to control the first flow rate control valve is determined by the controller, the calculated value by the @i pipe east side control device, and the #IS baking temperature value in the incinerator. and a furnace exhaust gas control unit that controls the second flow and the control valve based on the detected values of the furnace exhaust gas supplied to the incinerator, and the central control device that controls the oxygen concentration of the incineration gas of the incinerator. A heated air supply control unit that controls the third flow rate control valve based on the i(* value and the timing at which the supply of heated air to the incinerator is detected) is provided. Atmosphere of paint drying baking oven]

The details of the invention will be explained with reference to the embodiment illustrated in FIG. In FIG. 1, devices that are the same as those in FIG. 5 are indicated by the same numerals or numerals with the alphabet A appended thereto.

A large heat exchanger 52 is installed in the incineration exhaust gas exhaust path 16A of the incinerator 8A, and the heated air heated by the heat exchanger 52 flows through the control valve 12A through the path 54 that supplies the drying and baking furnace 6A. Supplied. A filter 56 is provided to remove dust from the air supplied to the pA exchanger 52.
An air flow rate control valve 58 for adjusting the flow rate of clean air is provided at a subsequent stage thereof. Furthermore, the control valve 5
A blower 60 is provided in order to blow clean air from the heat exchanger 52 to the heat exchanger 52, and a blower 60 is provided to supply a heated air amount between the blower 60 and the air inlet of the heat exchanger 52. An interlocking valve 62 is provided. Further, an interlocking valve 64 is connected to the blower 60 and is connected to the flow control valve 12AK by branching a part of the clean air from the blower 60 and mixing it with the heated air from the heat exchanger 52 to adjust the temperature of the heated air supplied to the flow control valve 12AK. 54.

On the other hand, on the inlet side of the flow control valve 34A of the fuel supply system, a flow detector 66 is provided to detect the flow t of the supplied fuel. The detection signal of this flow detector 66 and the central control device 14OA
Adjust the flow rate based on the control command output from 'jP3
A flow rate indicator controller 68 is provided to operate 4A. In order to detect the temperature of the furnace exhaust gas supplied to the incinerator 8, a temperature detector 70 is provided in the furnace exhaust gas path. In order to output the M degree command to the central 711 control device 40A, P
An exhaust gas temperature indicator 72 is provided. In addition, the controller 46
A and f3υTo operate the flow meter control valve 24A based on the output signal of the Togas detector 26A, the furnace exhaust gas
The n-adjustment scale 74 is provided with γ1. Ru. Central control device 4QA
In addition to the combustion temperature setting of the incinerator, the low heat generation of the solvent, and the output of the furnace exhaust gas [72], the flow rate is 16 controls each of the command adjustment, tl' 68 and the combustion temperature phase/td weighted 4OA.

[Function-1] In the above Ffj configuration, the clean air poured from the blower 60v is regulated by the interlocking 3P62, and BL is supplied to the heat exchanger 52. The heated air A that is output and the clean air that is output from the four excitation valves 64 are mixed and adjusted to the desired heated air, and then supplied to the control valve 12A.The control valve 12A is connected to the drying and baking furnace. 6
The opening degree is adjusted according to the temperature required by each zone of A, and the temperature is supplied to each zone by each blower 14A.

The paint is dried and baked using this temperature-controlled heated air alone. Furnace exhaust gas containing solvent evaporation gas from the drying and baking furnace 6A is blown to the incinerator 8A via the furnace exhaust gas distributor 20A, the blower 22A, the flow meter 26A, and the flow rate FA#1 valve 24A. The incinerator 8A is based on clean air, and can perform stable combustion using the furnace exhaust gas containing solvent evaporation gas and the fuel 32 without particularly requiring combustion air. The incineration strong gas from the incinerator 8A passes through the exhaust route 16A1 and the heat exchanger 52, and is emitted into the atmosphere from the chimney 38.

The system control device 40A stores the theoretical solvent evaporation amount (obtained from the fall# thickness of the paint applied to the strip 2, the width of the strip 2, the line speed, and the solvent content W-!g+ in the paint) and the amount of solvent. The heat source, the in-furnace solvent concentration setting value of the drying and baking furnace 6A (obtained based on the theoretical scenery of the furnace exhaust gas from the drying and baking furnace 6A which is incinerated by the incinerator 8A), and the combustion temperature setting value of the incinerator 8A are input. ing. The temperature of the furnace exhaust gas from the dry baking g56A, which is incinerated by the evaporator lid and the incinerator 8A, is inputted moment by moment to the control equipment '40A during operation, and is then incinerated by the incinerator 8A.
Calculate the amount of fuel used for the fuel fT! , and send it to the pupil instruction adjustment autopsy 68. The fuel flow rate indication adjustment It't68 is
The amount of fuel 32 supplied to the incinerator 8A is adjusted so that the amount of fuel 32 supplied to the incinerator 8A becomes the amount achieved by the central control system + i#40A.
14Ivi valve 34 by the signal from fit, ft66
Do rAs at A. In addition, the combustion temperature of the 28 incinerators was set to the temperature set in the central control device 40A based on the tiff of the furnace exhaust gas, the indication controller 74μ, and the amount of fuel in the incinerator 8A calculated by the central control device #40A. , furnace exhaust gas 'Ik from the drying and baking furnace 6A
In order to control this, the control valve 24A is adjusted by the m signal from the furnace exhaust gas flow rate detector 26A.

According to the present invention, even if a disturbance such as a line stop occurs and the in-furnace solvent evaporated gas concentration in the drying and baking furnace suddenly decreases, the pre-incinerator value calculated under the conditions before the line stops. In order to supply the incinerator with an amount of furnace exhaust gas from the drying and baking furnace commensurate with the amount of fuel used, the furnace exhaust gas control valve of the drying and baking furnace can be controlled via the incinerator combustion temperature instruction adjustment d.

Diagram 2 shows the solvent combustion rate (solvent burned in the incinerator).
/Theoretical solvent evaporation 1') and the furnace exhaust gas incineration rate (furnace exhaust gas t to be incinerated by the incinerator/theoretically necessary amount of furnace exhaust gas incineration). As is clear from the figure,
As the solvent combustion rate decreases, the amount of furnace exhaust gas incinerated becomes larger than the theoretical value (shown by the chain line), so the concentration of solvent evaporated gas in the dry baking furnace becomes lower than the set value of the lower explosion limit, making it safer. . -10,000, the conventional device ljL takes a constant value as shown by the broken line characteristic.

In addition, due to disturbances such as furnace gas containing solvent evaporation gas from the drying and baking furnace blowing out from the entrance and exit of the drying and baking furnace, and YH components of the solvent evaporating in the space from the coater roll to entering the drying and baking furnace, If it is known in advance that the amount of solvent caps burned in the incinerator will be reduced,
It is also possible to perform the above-mentioned control by multiplying the theoretical evaporator by a constant to calculate the fuel to be supplied to the incinerator.

The fIa diagram shows another embodiment of the invention.

First, I will explain its common origin. In this embodiment, in the same way as the device shown in Fig. 5, the incineration exhaust gas from the incinerator is supplied to the drying and baking furnace, and two heat exchangers are connected in series to the incinerator, and one of the heat exchangers is used to exhaust the gas from the drying and baking furnace. One heats the furnace exhaust gas, the other heats the outside air, and each of the hot air from both jaws is adjusted by I/let and supplied to the incinerator. In addition, in FIG. 3, the same device i1 or one having the same function as in FIG. 1 and FIG.

A heat exchanger 1 is provided between the incinerator 8B and the chimney 38.
8B and 78 are in 11 rows lol! will be inserted subsequently. Furnace exhaust gas from the drying and baking furnace 6B is supplied to the heat exchanger 18B, and outside air taken in by the blower 76 is supplied to the heat exchanger 78. Furnace exhaust gas from the drying and baking furnace 6B is supplied to the heat exchanger 18B by the blower 22B via the salmon 2OB. A flow rate detector 80 for detecting the flow rate of heated air from the heat exchanger 78 and a temperature detector 82 for detecting the temperature are provided between the heat exchanger 78 and the air flow rate control valve 30B. Furthermore, the flow rate detector 80 is provided with a flow rate instruction #t that calculates the detection signal into a flow rate signal and outputs it to the central control device 140B.
84 is connected to the temperature detector 82, and a temperature indicator 86 is also connected to the temperature detector 82, which calculates a detection signal into a temperature signal and outputs it to the central control device 140B. Furthermore, the air flow control valve 3
0B is provided with a flow rate indicator controller 88 for adjusting the flow rate of combustion air, and this controller 88 is connected to a flow rate detector 8o.
The control unit +140B, which is controlled based on the output signals of the and oxygen concentration indicating controller 44B, stores the theoretical solvent evaporation amount, the solvent heating lid, and the in-furnace solvent concentration setting value of the drying and baking furnace 6B. , the combustion temperature setting value of the incinerator 8B, the incineration exhaust gas acid i concentration setting value of the incinerator 8B,
The combustion air amount of the incinerator 8B and the combustion air temperature of the incinerator 8B are inputted.

As is clear from the above, the structure of the fuel and combustion air amount in the embodiment shown in FIG. 3 is similar to that shown in FIG. 5, and the structure of the furnace exhaust gas supply system to the incinerator is similar to that shown in FIG. 1. .

[Operation-2] In the above configuration, the cold air supplied to the heat exchanger 78 and the furnace exhaust gas from the drying and baking furnace 6B supplied to the heat exchanger 18B are brought to a predetermined temperature by the incineration exhaust gas heat from the incinerator 8B. It is heated and supplied to the incinerator 8B. The central control device 40B is inputted with the heat generation of the solvent, the in-furnace solvent concentration setting value of the drying and baking furnace 6B, the combustion temperature setting value of the incinerator 8B, and the incineration exhaust gas oxygen concentration setting value of the incinerator 8B. On the other hand, the theoretical solvent evaporation amount, the temperature of the furnace exhaust gas from the drying and baking furnace 6B that is incinerated by the incinerator 8B, and the temperature of the furnace exhaust gas from the incinerator 8B
The amount of combustion air of B and the temperature of combustion air of incinerator (1 g) are controlled by the central control device I every moment.
t40B, the central control device t40B calculates the amount of fuel used by the incinerator 8B, and this calculated value is sent to the fuel flow rate indicator controller 68B. The fuel flow rate indicator controller 68B determines whether the amount of fuel 32 used to be supplied to the incinerator 8B is determined by the central control device 140B.
The control valve 34B adjusts the usage amount according to the signal from the flow meter 66 so that the usage amount calculated in the above is achieved. Further, the furnace exhaust gas flow rate indicator controller 74B controls the drying baking furnace so that the combustion temperature of the incinerator 8B reaches the temperature set by the central control device 40BK, based on the fuel usage amount of the incinerator 8B calculated by the central control device 40B. In order to control the amount of furnace exhaust gas from 6A, the control valve 24B adjusts it based on a signal from the furnace exhaust gas flow rate detector 26B. Furthermore, the oxygen concentration indicating controller 44B indicates the incineration exhaust gas oxygen of the incinerator 8B! In order to maintain the oxygen concentration set in the central control device 40B at 11 degrees, the amount of air supplied to the incinerator 8B is adjusted by the control valve 30B based on a signal from the air flow rate detector 80.

〔Example〕

The non-inventor attempted to implement the present invention in the following case.

(5) Theoretical solvent evaporation amount in the drying baking oven: 1ooiψ/
h) Solvent exothermic chamber: 8500 Kcat/h4 (q
Furnace exhaust gas from a drying and baking furnace incinerated by an incinerator: 1/4 of the lower limit of solvent explosion (b) Temperature of furnace exhaust gas from a drying and baking furnace incinerated by an incinerator: 260°C (average Incinerator temperature near 00°C) A comparison between the resulting relationship between the solvent combustion rate and the amount of fuel used in the incinerator with the conventional method is as shown in Figure 'Kc4.As is clear from Figure 4, the present invention provides a The amount of fuel used in the incinerator is constant, but in the conventional method, the amount of fuel used in the incinerator changes greatly depending on the solvent combustion rate.In particular, the concentration of solvent evaporated gas in the drying and baking furnace increases due to line stoppages, etc. When it becomes zero, the amount of fuel used by the incinerator becomes 3 to 4 times as much as when the solvent combustion rate is 100 inches.

〔Effect of the invention〕

As is clear from the above embodiments, the amount of fuel used by the incinerator is constant regardless of the solvent combustion rate, so the present invention is suitable for incinerators used in drying and baking furnaces with low operating rates, such as high-mix, low-volume production lines, etc., where the line is frequently stopped. can reduce average fuel consumption.

In addition, the necessary amount of heat is supplied to the drying and baking furnace by heated air that has exchanged heat with the incineration exhaust gas of the incinerator.
Since the incinerator is always operated during short line stoppages, the heat exchanger is in a steady state.
It has the advantage of being able to restart operations.

Furthermore, since the device is simple, the equipment cost is low, and
The operation and system are simple, making it easy to operate. Furthermore, even if the solvent combustion rate decreases, the concentration of solvent evaporated gas in the drying and baking furnace will be lower than the set value of 1, which has great effects such as improving safety.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the present invention, Fig. 2 is a diagram comparing the relationship between the solvent combustion rate and the furnace exhaust gas incineration rate with the conventional method, the method of the present invention, and the buried brass value. A system diagram showing other preferred embodiments of the present invention, Figure 4 shows the relationship between the solvent combustion rate and the fuel usage lid of the ink tanker in comparison with the conventional method, and Figure 5 shows the conventional continuous drying of paint. This is a diagram of the furnace. 2... Strip, 6A, 6B... Drying baking furnace, 8.8B... Incinerator, 16A, 16B... Discharge route, 20A, 20B... Furnace exhaust gas piping, 40A, 40B... Concentration Control device, 42A, 42B...Controller, 44B...Oxygen concentration indicator adjustment needle, 46A, 46B...Temperature indicator controller, 52...Heat exchanger, 54...Clean air piping, 68B ...Fuel flow rate indicator adjustment needle, 70...Temperature detector, 72B...Furnace exhaust gas temperature indicator, 74B...Furnace exhaust gas amount indicator controller, 78...Combustion air heat exchanger , 84... Combustion air amount indicator, 86... Combustion air temperature indicator, 88... Combustion air amount indicator controller.

Claims (3)

[Claims] (1) In a continuous drying and baking method for paint, in which the treated material with paint adhered to it is passed continuously through a drying and baking furnace and the generated furnace exhaust gas is guided to an incinerator to incinerate the solvent evaporated gas contained therein, the drying and baking From the theoretical solvent evaporation amount in the furnace, the calorific value of the solvent, the amount of furnace exhaust gas from the drying and baking furnace to be incinerated by the incinerator, the humidity of the furnace exhaust gas from the drying and baking furnace to be incinerated by the incinerator, and the combustion temperature of the incinerator. The dry burning process calculates the amount of fuel used in the incinerator, and incinerates the incinerator based on the calculated value so that the amount of fuel used in the incinerator becomes constant regardless of the amount of solvent burned in the incinerator. An atmosphere control method for a paint drying and baking furnace characterized by controlling the amount of furnace exhaust gas from the furnace. (2) In a continuous paint drying and baking device that continuously passes a treatment furnace with paint adhered to it through a drying and baking furnace, and directs the furnace exhaust gas generated at that time to an incinerator to incinerate the solvent evaporation gas contained therein. a furnace exhaust gas temperature detection unit that detects the temperature of the furnace exhaust gas supplied to the incinerator;
a first flow control valve that adjusts the supply amount of fuel to be burned in the incinerator; a second flow control valve that adjusts the amount of furnace exhaust gas supplied to the incinerator; a humidity detection value of the furnace exhaust gas temperature detector; Calculating the amount of fuel used by the incinerator based on each of the theoretical solvent evaporation amount in the drying and baking furnace, the calorific value of the solvent, the solvent concentration setting in the drying and baking furnace, and the combustion temperature setting of the incinerator. a flow rate indicating controller that controls the first flow rate regulating valve based on the calculation result of the central control device and the fuel flow rate detection value; a furnace exhaust gas adjustment section that controls the second flow rate adjustment valve based on each of the temperature value and the detected value of the amount of furnace exhaust gas supplied to the incinerator;
An atmosphere control device for a paint drying and baking oven characterized by being provided with. (3) In a continuous paint drying and baking device that continuously passes the treated material to which the paint is attached through a drying and baking furnace, and directs the furnace exhaust gas generated at that time to an incinerator to incinerate the solvent evaporation gas contained therein. a furnace exhaust gas temperature detection unit that detects the temperature of the furnace exhaust gas supplied to the incinerator;
A first flow rate control valve that adjusts the amount of fuel to be combusted in the incinerator, a second flow rate control valve that adjusts the amount of furnace exhaust gas that is supplied to the incinerator, and a second flow rate control valve that adjusts the flow rate of heated air that is supplied to the incinerator. a third flow rate control valve, a temperature detection unit of the furnace exhaust gas temperature detection unit, a theoretical solvent evaporation amount in the drying and baking furnace, a calorific value of the solvent, a solvent concentration setting value in the drying and baking furnace, and the heated air. a central control device that calculates the amount of fuel used by the incinerator based on each of the flow rate and temperature of the incinerator, and the combustion temperature set value of the incinerator; and the first flow rate adjustment based on the calculation result of the central control device. The second flow control valve is controlled based on a flow rate indicating controller that controls the valve, a calculated value by the central control device, a combustion temperature value in the incinerator, and a detected value of the amount of furnace exhaust gas supplied to the incinerator. The third flow rate regulating valve is controlled based on the furnace exhaust gas regulating unit to be controlled, the oxygen degree of the incineration gas of the incinerator, the calculated value by the central control device, and the detected value of the supply flow rate of heated air to the incinerator. An atmosphere control device for a paint drying and baking oven, characterized in that it is provided with a heated air supply adjustment section for controlling.