JP5130779B2 - Solvent exhaust treatment method and exhaust fan control device in continuous coating equipment - Google Patents

Description

  The present invention relates to a solvent exhaust processing method for discharging a volatilized solvent generated during drying / baking processing of a continuous coating equipment through a deodorizing device of a heating catalyst type, and an exhaust fan for adjusting an exhaust amount from the deodorizing device. The present invention relates to a control device.

Conventionally, as described in Patent Document 1, an organic solvent-based paint is applied to a continuously transported strip by a coating device such as a coater, and then passed through an oven device for drying and baking. There is a continuous coating facility that performs the treatment and lowers the temperature by passing through a cooling device such as an air cooling zone.
In the course of drying and baking in the oven device, the solvent is volatilized from the paint applied to the strip. Therefore, it is necessary to discharge the volatile gas of the solvent to the outside. At this time, it is common to discharge through a deodorizing device so as to comply with VOC regulations or legal regulations of the Odor Control Law.

There are several types of deodorizers, and one of them is a heated catalyst system. This is because the exhaust gas generated in the oven device is heated to a certain temperature and then passed through a catalyst to decompose the solvent component, lower the VOC concentration and deodorize, and then discharge the gas after combustion. is there. This method can be applied to a relatively wide range of solvent types, and high-concentration deodorization is also possible. Further, by using a catalyst, the temperature necessary for decomposing the solvent component can be lowered to, for example, about 350 ° C. or lower, so that the fuel cost is reduced compared to the direct combustion type that requires around 750 ° C. be able to. In addition, exhaust heat after deodorization can be effectively used for heating the gas before deodorization, and the fuel cost can be further reduced.
The type of fuel that heats the exhaust gas is not particularly limited, but kerosene or the like is used.

  The flow rate of exhaust gas after deodorization discharged from the deodorization device is related to the solvent concentration in the gas before deodorization.If the amount of exhaust gas after deodorization is low when the amount of solvent supplied to the deodorization device is large, the oven deodorization device There is a possibility that the solvent concentration in the inside exceeds the lower limit of explosion limit. In consideration of this, in general, the air volume of exhaust gas after deodorization is set to a fixed constant value that is well below the lower limit of explosion even with the maximum amount of solvent that can be used for all purposes. In the apparatus, combustion control is performed while controlling the amount of fuel supplied to the deodorizer so that the exhaust gas supplied to the deodorizer has a set temperature.

Further, in Patent Document 1, the actual solvent concentration in each zone is actually measured with a solvent concentration detector in the oven apparatus, and the exhaust damper is controlled to open and close based on the measured value. It is disclosed that the concentration is not more than a predetermined concentration (see paragraph 0008). In addition, the supply / exhaust amount of the entire oven apparatus is controlled based on the actual solvent concentration in the collective exhaust duct. Specifically, the exhaust gas flow rate in the collective exhaust duct is initially controlled so as to be an initial set amount, and the collective exhaust duct is controlled. When the measured value of the solvent concentration detector provided in the above is greater than or equal to a predetermined value, the rotational speed of the exhaust fan 13 is increased to control the concentration in the oven device to be equal to or lower than the predetermined value (paragraph number). 0009).
The exhaust gas that passes through the collective exhaust gas is supplied to the deodorizing device 15.
JP-A-8-38855

In the above-described conventional technology, the exhaust gas is circulated so that the solvent concentration in the oven device does not exceed a predetermined value, and the solvent component or the like in the oven device is controlled to be below the lower explosion limit.
However, there is a possibility that the solvent concentration in the deodorizing apparatus will be higher than the lower limit of explosion.
In addition, if the case where the supply of the exhaust gas to the deodorizer is controlled so that the actual solvent concentration is measured and the feedback is below the lower limit of explosion limit is assumed, the following problems are considered. The strip transport speed is not always constant and often fluctuates. Even if the coating amount is controlled to be within the control range, it varies within the control range. When the supply / exhaust control is performed with feedback based on the above, if the solvent concentration suddenly increases, the temperature in the deodorizer may be lower than the target temperature because the combustion response is slower than the exhaust .
This invention is made paying attention to such a point, and makes it a subject to enable the exhaust via the deodorizing device within the solvent amount range below the explosion limit lower limit value while suppressing the fuel to be used. .

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention is such that an organic solvent-based paint is applied to a continuously conveyed strip by a coating apparatus, followed by drying and drying by an oven apparatus. In addition to baking, the volatilized solvent generated in the drying / baking process is continuously supplied to the deodorizer of the heating catalyst type, and the fuel in the deodorizer is set so that the ambient temperature in the deodorizer becomes a predetermined temperature. In the solvent exhaust treatment method in a continuous coating facility that heats the continuously supplied solvent with the deodorizer while supplying the gas, oxidizes and decomposes the gas through a catalyst and exhausts it to the outside.
Estimate the maximum amount of solvent per unit time supplied to the deodorizer based on the previously known strip specifications and the processing capacity of the continuous coating equipment, and use the estimated maximum amount of solvent as the estimated maximum amount of solvent. When defined, adjust the exhaust amount from the deodorizer according to the estimated maximum solvent amount, and increase the exhaust amount as the estimated maximum solvent amount increases, and decrease the exhaust amount as the estimated maximum solvent amount decreases. It is characterized by.

Next, the invention described in claim 2 is the configuration described in claim 1, wherein the estimated maximum solvent amount is determined by the strip conveyance speed determined from the strip specifications and the processing capacity of the continuous coating equipment, The calculation is based on the maximum applicationable amount per unit time in the coating apparatus and the width of the strip.
Next, when the invention described in claim 3 predicts that the estimated maximum solvent amount increases by a predetermined amount or more with respect to the configuration described in claim 1 or claim 2, the amount of solvent supplied to the deodorizing apparatus. The engine is characterized in that the displacement is increased prior to the time at which increases.
Next, the invention described in claim 4 is a continuous coating facility in which hot air is continuously supplied into the oven apparatus with respect to the configuration described in any one of claims 1 to 3. In the solvent exhaust treatment method,
The supply amount of the hot air is adjusted in accordance with the exhaust amount from the deodorizing device.

Next, in the invention described in claim 5, an organic solvent-based paint is applied to a continuously conveyed strip by a coating device, followed by drying and baking by an oven device, and the drying / baking. Volatile solvent generated in the process is continuously supplied to the deodorizing device of the heated catalyst system, and the deodorizing device is used to supply the fuel so that the atmospheric temperature in the deodorizing device becomes a predetermined temperature. A control device that controls the air volume of an exhaust fan in a continuous coating facility that heats a continuously supplied solvent and oxidizes and decomposes the gas through a catalyst and exhausts it to the outside by an exhaust fan,
Estimated maximum solvent amount calculating means for calculating the maximum amount of solvent per unit time supplied to the deodorizer based on the previously known strip specifications and the processing capacity of the continuous coating equipment, and the estimated maximum amount of solvent based on the maximum amount of solvent per calculated unit time calculating means, the air flow rate of the exhaust fan, the larger estimated maximum amount of solvent is often larger the air volume of the exhaust fan, the air volume of the exhaust fan as the estimated maximum amount of solvent is less Provided is an exhaust fan control device in a continuous painting facility, characterized in that it includes an exhaust amount adjusting means for adjusting the exhaust gas to be small .

In the present invention, when the solvent generated in the drying and baking process is continuously supplied to the deodorizing apparatus of the heated catalyst system and deodorized, the maximum amount of solvent per unit time supplied to the deodorizing apparatus is estimated, By adjusting the amount of exhaust from the deodorizer based on the estimated value, the fuel cost can be reduced while ensuring the solvent concentration below the lower explosion limit.
In addition, the maximum amount of solvent supplied to the deodorizer under the current operating conditions is estimated, and if the estimated maximum amount of solvent is large, the amount of solvent in the deodorizer is increased by increasing the exhaust amount by the exhaust fan. The concentration can be reduced to prevent explosion in the deodorizing apparatus.

  In addition, when the exhaust amount from the deodorizer is always a constant value, the solvent concentration in the deodorizer is less than the explosion limit value with the maximum amount of solvent supplied to the deodorizer assuming all conditions. The amount of evacuated solvent from the deodorizer will be set, but the amount of volatile solvent generated in the oven will vary depending on the amount applied to the strip, the width of the strip, and the transport speed of the strip. In many cases, it is less than the amount of the solvent. Therefore, with the constant exhaust gas air flow set assuming the maximum amount of solvent, the smaller amount of solvent will compensate for fuel such as kerosene so that it reaches a predetermined temperature. In addition, the amount of fuel used increases and the running cost increases. That is, when the amount of solvent that is actually supplied is small, the amount of fuel used is increased by adding more fuel so that the temperature is sufficient for decomposition by the catalyst. .

Compared with this, in the present invention, the exhaust amount of the deodorizing device is determined by the maximum solvent supply amount (estimated maximum solvent amount) per unit time at each time, which is obtained according to the current operating conditions that are known in advance. By controlling the above, it is possible to suppress the amount of fuel consumption required to maintain the temperature in the deodorizing apparatus at a temperature that can be decomposed by the catalyst.
Also, calculate and use the maximum amount of solvent generated under the current conditions obtained from the strip specifications and equipment capacity, which are known in advance, such as the maximum application amount for the target strip, continuous coating equipment, and coating equipment. As a result, the solvent concentration in the deodorizing apparatus can be set to be lower than the explosion limit value even if the carrying speed varies.

Moreover, although the responsiveness of combustion in the deodorizing apparatus is slower than the change in the exhaust amount, the exhaust amount is increased before the amount of the supplied solvent increases as described in claim 2. By doing so, the exhaust amount is changed before the change point of the maximum amount of solvent, and it is possible to prevent the temperature in the deodorizing apparatus from becoming lower than the target temperature and incomplete deodorization.
In addition, when hot air is supplied to the oven device, changing the exhaust amount of the deodorization device may cause a balance between supply and exhaust in the oven device, which may cause condensation, etc. According to the invention of 3, since the amount of hot air supplied to the oven device is changed in accordance with the exhaust amount, the atmosphere in the oven device can be stabilized and the occurrence of condensation or the like can be suppressed.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a continuous coating facility in the present embodiment.
(Constitution)
The configuration of the continuous coating facility will be described. A coating device 2, an oven device 3, and a cooling device 4 including an air cooling zone are arranged from the upstream side along the line.

  The strip 1 that is continuously conveyed is continuously coated with an organic solvent-based coating on one or both sides of the strip 1 by a coating device 2 such as a roll coater, and then the solvent-based coating is applied. The strip 1 is dried and baked when passing through the oven device 3. Thereafter, the temperature of the strip 1 drops to a predetermined temperature after passing through the cooling device 4.

  Hot air is supplied into the oven device 3 through the hot air supply passage 14, and gas in the oven device 3 is sent to the deodorization device 5 through the exhaust passage 15. As a result, the gas containing the volatilized solvent generated during the drying / baking process when passing through the oven device 3 is continuously supplied to the deodorizing device 5. The exhaust gas may be supplied to the deodorizing device 5 by suctioning the inside of the oven device 3 in a negative pressure state to the deodorizing device 5 or by providing a fan in the middle of the exhaust passage 15 forcibly. May be.

The deodorizing device 5 includes a combustion portion 5a in which exhaust gas is supplied from the oven device 3 through the exhaust passage 15, an catalyst installation portion 5b that communicates with the combustion portion 5a and has a catalyst disposed therein, And an exhaust gas passage 7 for discharging the exhaust gas that has passed through the catalyst installation portion 5b. The downstream side of the exhaust gas passage 7 is connected to a chimney (not shown). Further, exhaust heat is utilized for heating the gas before deodorization through a heat exchanger (not shown).
A fuel tank 6 containing fuel is connected to the combustion section 5a via a fuel supply pipe 8, so that fuel can be supplied to the combustion section 5a. A flow rate adjusting valve 9 is provided in the middle of the fuel supply pipe 8, and the flow rate adjusting valve 9 adjusts the opening according to a flow rate command from the control device 12, thereby the atmosphere in the deodorizing device. The fuel supply amount is adjusted so that the temperature becomes the target temperature.
In addition, a temperature sensor 16 that measures the ambient temperature in the oven device 3 and supplies the measured temperature to the control device 12 is provided.

As shown in FIG. 2, the control device 12 includes a fuel adjustment unit 12A, an estimated maximum solvent amount calculation unit 12B, an exhaust amount adjustment unit 12C, a prediction unit 12D, and a hot air adjustment unit 12E.
The fuel adjustment unit 12A outputs a flow rate command to the flow rate adjustment valve 9 such that the ambient temperature becomes a predetermined temperature according to the ambient temperature in the oven device 3 measured by the temperature sensor 16. For example, the flow rate (fuel supply amount) by the flow rate adjustment valve 9 is feedback-controlled so that the deviation between the measured ambient temperature and the target predetermined temperature becomes small.

  Further, the estimated maximum solvent amount calculation unit 12B constitutes an estimated maximum solvent amount calculation means, and as shown in FIG. 3, operates in response to changes in the specifications and application conditions of the strip 1, In step S10, the specifications of the strip 1, such as the width and thickness of the strip 1 to be processed, are input, and in step S20, the specifications of the strip 1 and the processing of the continuous coating equipment set and stored in advance. Based on the capability, the maximum conveyance speed capable of processing the strip 1 is obtained. For example, referring to a map that is set and stored in advance, the maximum transport speed (first maximum transport speed) that can be output when the coating apparatus 2 performs coating on the strip 1, and the oven apparatus 3 The maximum transport speed (second maximum transport speed) at which drying and baking can be performed and the maximum transport speed (third maximum transport speed) at which the strip 1 can be air-cooled in the air cooling zone are obtained, respectively. The smallest value of the maximum transport speeds is set as the maximum transport speed to be obtained.

Next, in step S30, the maximum application amount to be applied by the coating apparatus is calculated for the target strip 1. For example, the maximum application amount is calculated based on the maximum value of the target application amount range set in the application apparatus 2. Of course, the maximum application amount allowed for the equipment capacity and operating conditions in the coating apparatus may be fixedly set as the maximum application amount.
Subsequently, in step S40, the maximum application amount per unit length is calculated from the width of the strip 1 (amount corresponding to the application area) and the maximum application amount, and the calculated maximum application amount and the unit paint are calculated. From the maximum concentration of the organic solvent contained, the maximum amount of solvent that will volatilize is calculated from the unit length of the strip 1. In step S50, the estimated maximum amount of solvent per unit time generated in the oven device 3 per unit time and continuously supplied to the deodorizing device 5 is calculated from the maximum amount of solvent and the maximum transport speed. Calculate.

Furthermore, in step S50, the estimated maximum solvent amount is stored in the storage unit, a history is taken, and the process is terminated.
Here, in the above description, the estimated maximum solvent amount is calculated by taking a plurality of steps, but actually, the calculation is performed by combining them into one equation.
Further, the exhaust amount adjustment unit 12C selects an estimated maximum solvent amount that will be generated from the oven device 3 at the current time based on the estimated maximum solvent amount stored in the storage unit, and exhausts based on the estimated maximum solvent amount. An air volume command corresponding to the amount of air discharged by the fan 10 is calculated, and the air volume command value is output to the exhaust fan 10. The exhaust amount adjusting unit 12C constitutes an exhaust amount adjusting means.

  The air flow command value is based on a map of the estimated maximum solvent amount set beforehand based on experiments and the corresponding exhaust amount, and the estimated maximum solvent amount per unit time according to the selected current operation is determined by the deodorizer. Even if it is continuously supplied to No. 5, it is set so that it becomes the minimum displacement among the displacements sufficiently below the lower limit of explosion limit. Here, being sufficiently below the lower explosion limit value generally means that the solvent concentration in the gas is not more than a quarter of the lower explosion limit concentration.

  When the maximum solvent amount calculated this time is larger than the previously calculated maximum solvent amount by a predetermined amount or more, the prediction unit 12D calculates the current time before a predetermined time before the time when the maximum solvent amount calculated this time will occur. Change the air flow according to the maximum amount of solvent. For example, when the maximum solvent amount calculated this time is larger than the previously calculated maximum solvent amount by a predetermined amount or more, the maximum solvent amount before the predetermined time is replaced with the value of the maximum solvent amount calculated this time. As a result, the exhaust amount corresponding to the maximum amount of solvent calculated this time is changed before actually becoming the target of the maximum amount of solvent calculated this time.

Note that “predetermined or greater” when “larger than the previously calculated maximum amount of solvent” is greater than or equal to “predetermined” refers to a case where a significant temperature drop of a predetermined amount or more may occur in the deodorizing apparatus 5 due to the increased amount of the solvent.
The hot air adjusting unit 12 </ b> E outputs to the hot air fan 11 a command value that is an air volume corresponding to the air volume of the exhaust fan 10. The air volume of the hot air is set to a value slightly smaller than the air volume of the exhaust fan 10, for example, and the inside of the oven device 3 is set to a negative pressure state.

(Function and effect)
After the solvent-based paint is applied by the coating device 2 to one or both surfaces of the strip 1 that is continuously passed, the strip 1 is continuously conveyed to the oven device 3. Then, drying and baking processes are performed in the process of passing through the oven device 3, and exhaust gas generated at that time is continuously discharged to the outside through the deodorizing device 5. That is, the solvent of the volatile component generated in the oven device 3 is processed by the deodorizing device 5 and discharged outdoors.
In the deodorizing device 5, fuel is supplied so as to reach a set temperature, the exhaust gas continuously supplied with the fuel is heated and burned, and the gas is discharged to the outside through the exhaust gas passage 7 through the catalyst.
Here, the amount of solvent flowing into the deodorizing device 5 is determined by the width of the strip 1, the transport speed of the strip 1, the coating amount at the coating device 2, and the volatilization amount per unit area from the solvent-based paint.

  However, the conveying speed of the strip 1 is not always constant and often varies. Usually, a target management range is determined for the coating amount, but it is inevitable that the coating amount fluctuates within that range. Therefore, in order to always be well below the lower limit of explosion limit, the conveying speed of the strip 1 is the maximum considering all of the processing capacity of the oven apparatus 3, the cooling capacity after the oven apparatus 3, and other restrictions. In the present embodiment, the estimated maximum solvent amount, which is the estimated maximum, is obtained based on the conveyance speed.

  Here, the maximum conveyance speed varies depending on the size of the strip 1, for example, and the maximum application amount and the maximum solvent ratio in the paint differ depending on the type, and can be obtained in advance. is there. In addition, the coating amount and the volatilization amount in the solvent-based paint are the upper limit value of the coating amount management range, the maximum coating amount assuming the largest amount of solvent in the management range for diluting the coating material, and the coating amount The maximum solvent ratio.

From the above, the estimated maximum amount of solvent currently supplied can be obtained, for example, by the product of the width of the strip 1, the maximum conveying speed, the maximum application amount, and the maximum solvent ratio in the paint. The minimum exhaust amount that is sufficiently lower is calculated, and the air volume of the exhaust fan 10 is adjusted so as to be the minimum exhaust amount.
That is, in this embodiment, the minimum displacement of the exhaust amount sufficiently lower than the lower limit of explosion limit with respect to the estimated maximum solvent amount obtained in advance from the specifications and facility capacity of the current strip 1 is calculated, and the calculated minimum The air volume of the exhaust fan 10 is adjusted so as to be the exhaust volume.

For this reason, even if there is a change in the actual transport speed of the strip 1 or a change in the actual coating amount, the solvent concentration in the oven device 3 and the deodorizing device 5 can be set to the explosion limit lower limit value. Explosions in the oven device 3 and the deodorizing device 5 can be avoided.
Moreover, although the amount of solvent actually supplied changes continuously, since the exhaust amount is set according to the assumed maximum amount, fluctuations in the exhaust amount can be suppressed. Although the combustion responsiveness is worse than the exhaust responsiveness, the exhaust amount is not continuously changed according to the actual amount of solvent supplied, so that the stability of exhaust control is good.

Here, as the air volume of the exhaust fan 10 is increased to increase the exhaust gas volume, the solvent concentration in the deodorizing device 5 can be lowered. Therefore, the solvent concentration can be reduced by adjusting the exhaust gas volume according to the solvent amount. Can be set to the lower explosion limit.
Moreover, since the estimated maximum amount of solvent is changed based on the specifications of the strip 1 currently targeted and the processing capacity of the equipment, the atmosphere in the deodorizing device 5 is compared with the case where the maximum amount of solvent is fixed. It is possible to reduce the amount of fuel that is added to bring the temperature to a predetermined temperature.
Here, although the solvent itself also burns and contributes to the temperature rise, increasing the discharge amount from the deodorizing device 5 leads to lowering the ambient temperature in the deodorizing device 5, so that the larger the discharge amount is set. There is a tendency for more fuel to be input.

  Further, when the estimated maximum amount of solvent increases because the size of the strip 1 is changed or the maximum conveying speed is increased, the deodorizing device 5 is used to prevent the explosion limit from being exceeded. It is necessary to increase the exhaust amount in advance before the change point of the maximum solvent amount. If the exhaust amount of the deodorizing device 5 is increased in advance, the processing gas temperature decreases at a time before the change point of the maximum solvent amount, so that more fuel must be combusted accordingly. However, responsiveness is generally poorer when the combustion is changed than when the displacement is changed. Therefore, considering the responsiveness of combustion, by changing the exhaust amount in an increasing direction before the change point of the maximum solvent amount, it is possible to prevent the deodorization from becoming incompletely lower than the target temperature.

Here, the type of the oven device 3 is not particularly limited, such as combustion air, induction heating, and the like, but hot air is supplied as a countermeasure against condensation in the oven device 3 or even when the combustion air is not used.
Further, simply changing the exhaust amount of the deodorizing device 5 is not preferable because the supply / exhaust balance in the oven device 3 is lost, and in some cases, condensation or the like occurs. On the other hand, by controlling the exhaust amount of the deodorizing device 5 based on the estimated maximum solvent amount obtained, and simultaneously controlling the supply amount of air to the oven device 3, the inside of the oven device 3 can be stably maintained. Condensation countermeasures can be realized.
The strip 1 is not particularly limited, and the coating device 2 is not limited.

The present invention will be described in detail with reference to the following examples and comparative examples.
The continuous coating treatment was performed on the coil of the galvanized steel sheet having a plate thickness of 0.3 to 3.0 mm and a plate width of 900 to 1600 mm using the coating device 2 and the deodorizing device 5 described in the embodiment.
It applied so that the application | coating adhesion amount of a solvent-type coating material may apply | coat within the control range of 0.3-0.5 g / m < ² >. The concentration of the solvent-based paint was controlled within a range of 7 ± 0.5%. The maximum conveyance speed is calculated for each coil from the galvanized steel sheet size and the oven device 3 capability or the cooling capability.

From the above, the estimated maximum amount of solvent was determined by the following formula.
Estimated maximum amount of solvent = maximum transport speed x plate width x (0.5 / 0.065)
Considering the capacity of the deodorizing device 5 and the like with respect to the estimated maximum solvent amount obtained by the above equation, the exhaust amount of the deodorizing device 5 was determined so that the concentration would be a quarter of the lower limit of explosion limit. Further, kerosene was burnt at a gas temperature at the catalyst inlet from the amount of solvent actually flowing into the deodorizer 5 and the exhaust amount. Although the amount of kerosene used varies depending on the steel sheet size, etc., the average amount of kerosene used was 22.2 (L / hr).
On the other hand, as a comparative example, when the treatment with the exhaust amount of the deodorizing device 5 made constant as in the prior art was performed, the average amount of kerosene used was 42.0 L / hr.

Next, an example in which the estimated maximum amount of solvent obtained above increases will be shown.
As a timing to change the exhaust amount of the deodorizing device 5 before the change point of the maximum solvent amount in the deodorizing device 5, a signal that the coil is inserted into the line and welding with the coil immediately before the coil is completed is given. It was a trigger. Therefore, the exhaust amount of the deodorizing device 5 was increased within the time from the completion of welding to the oven device 3, and the load on the combustion burner could be increased accordingly.

Furthermore, the amount of air supplied to the oven device 3 was controlled simultaneously with the change in the exhaust amount of the deodorizing device 5. The oven device 3 is an induction heating system, and hot air of 80 ° C. was supplied into the oven device 3 as a countermeasure against condensation and dirt. In order to prevent the gas containing the solvent in the oven device 3 from flowing out to the surroundings as much as possible, the supply amount was made 10% smaller than the displacement amount and balanced with the displacement amount. Accordingly, the discharge of gas from the oven device 3 to the surroundings or the inflow of air from the surroundings to the oven device 3 can be kept to a minimum. The discharge of gas containing solvent to the surrounding area could be suppressed.
In addition, although the steel plate was used as the strip 1 in the said Example, it is not limited to a steel plate especially, It applies to other metal plates, such as aluminum, paper, and a film.

It is a general | schematic block diagram explaining the continuous coating equipment which concerns on embodiment based on this invention. It is a figure which shows the structural example of the control apparatus 12 which concerns on embodiment based on this invention. It is a flowchart which shows the process of the estimated maximum solvent amount calculation part 12B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strip 2 Application | coating apparatus 3 Oven apparatus 4 Cooling apparatus 5 Deodorizing apparatus 5a Combustion part 5b Catalyst installation part 6 Fuel tank 7 Exhaust gas path 8 Fuel supply pipe 9 Flow control valve 10 Exhaust fan 11 Hot air fan 12 Control apparatus 12E Hot air adjustment part 12A Fuel Adjustment unit 12B Estimated maximum solvent amount calculation unit 12C Exhaust amount adjustment unit 12D Prediction unit 14 Hot air supply path 15 Exhaust path 16 Temperature sensor

Claims (5)

Apply organic solvent-based paint with a coating device to the strips that are continuously conveyed, then dry and bake them with an oven device, and continuously remove the volatile solvent generated during the drying and baking process. While supplying the fuel to the deodorizing apparatus and supplying the fuel to the deodorizing apparatus so that the ambient temperature in the deodorizing apparatus becomes a predetermined temperature, the solvent supplied continuously is heated with the gas. In a solvent exhaust treatment method in a continuous coating facility that oxidizes and decomposes through a catalyst and exhausts it outside,
Estimate the maximum amount of solvent per unit time supplied to the deodorizer based on the previously known strip specifications and the processing capacity of the continuous coating equipment, and use the estimated maximum amount of solvent as the estimated maximum amount of solvent. When defined, adjust the exhaust amount from the deodorizer according to the estimated maximum solvent amount, and increase the exhaust amount as the estimated maximum solvent amount increases, and decrease the exhaust amount as the estimated maximum solvent amount decreases. Solvent exhaust treatment method in continuous painting equipment characterized by   The estimated maximum amount of solvent should be calculated based on the strip transport speed determined from the strip specifications and the processing capacity of the continuous coating equipment, the maximum coating amount per unit time in the coating equipment, and the strip width. The solvent exhaust treatment method in a continuous coating facility according to claim 1.   3. The exhaust amount is increased before the amount of solvent supplied to the deodorizer increases when the estimated maximum solvent amount is predicted to increase by a predetermined amount or more. Solvent exhaust treatment method in continuous coating equipment described in 1. In the solvent exhaust treatment method in a continuous coating facility that continuously supplies hot air into the oven device,
The solvent exhaust treatment method in a continuous coating facility according to any one of claims 1 to 3, wherein a supply amount of the hot air is adjusted in accordance with an exhaust amount of the deodorizing device. Apply organic solvent-based paint with a coating device to the strips that are continuously conveyed, then dry and bake them with an oven device, and continuously remove the volatile solvent generated during the drying and baking process. While supplying the fuel to the deodorizing device and supplying the fuel to the deodorizing device so that the atmospheric temperature in the deodorizing device becomes a predetermined temperature, the exhaust fan is heated while supplying the solvent continuously supplied by the deodorizing device. Is a control device that controls the air volume of an exhaust fan in a continuous painting facility that oxidizes and decomposes the gas through a catalyst and exhausts the gas to the outside.
Estimated maximum solvent amount calculating means for calculating the maximum amount of solvent per unit time supplied to the deodorizer based on the previously known strip specifications and the processing capacity of the continuous coating equipment, and the estimated maximum amount of solvent based on the maximum amount of solvent per calculated unit time calculating means, the air flow rate of the exhaust fan, the larger estimated maximum amount of solvent is often larger the air volume of the exhaust fan, the air volume of the exhaust fan as the estimated maximum amount of solvent is less An exhaust fan control device in a continuous painting facility, characterized in that the exhaust air amount adjusting means is adjusted to be small .

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