JP5221256B2 - Static pressure control device - Google Patents

Description

  The present invention relates to a static pressure control device. Specifically, the present invention relates to a static pressure control device capable of controlling the amount of purified air and high-temperature gas introduced by combustion purification of exhaust gas.

As a technique for controlling the supply air supplied to the painting zone of an automobile body or the like, for example, a technique disclosed in Patent Document 1 can be cited. In this technique, the wind speed of the supply air is detected by a wind speed sensor for each painting zone to be controlled, and the opening degree of the auto damper installed for each painting zone is adjusted. As a result, when supplying air-conditioned air from the air conditioner to multiple paint zones, even if the flow resistance of the air-conditioned air supply system changes, the air-conditioning air is supplied at an appropriate air supply speed for each paint zone. It can be supplied at.
JP 2004-237263 A

  By the way, at present, exhaust gas containing volatile organic compounds (hereinafter referred to as VOC), such as exhaust gas discharged from painting equipment, is purified and then released into the atmosphere. For this reason, when a combustion method or the like is used for exhaust purification, it is desired to develop an exhaust recycle system that can recycle purified air and recycle high-temperature gas generated by combustion to effectively use waste heat. . And in the development, it is indispensable to develop a static pressure control device capable of controlling the amount of purified air to be recycled and the amount of high-temperature gas.

  The present invention has been made in view of the above, and an object of the present invention is to provide a static pressure capable of controlling the amount of purified air and high-temperature gas introduced by combustion purifying exhaust gas discharged from a predetermined zone. It is to provide a control device.

  As a result of intensive studies, the present inventors have found that the above object can be achieved by a static pressure control device having the following configuration, and have completed the present invention. More specifically, the present invention provides the following inventions.

  The static pressure control device according to claim 1 is provided in a static pressure adjustment chamber into which purified air and high-temperature gas obtained by combustion purification of exhaust gas discharged from a predetermined zone are introduced, and the static pressure adjustment chamber. A fresh air supply mechanism that supplies fresh air into the static pressure adjustment chamber, a high temperature gas concentration sensor that is provided in the static pressure adjustment chamber and measures a high temperature gas concentration in the static pressure adjustment chamber, and the high temperature gas concentration The amount of purified air and the amount of hot gas introduced into the static pressure adjustment chamber by adjusting the pressure in the static pressure adjustment chamber by driving the fresh air supply mechanism based on the hot gas concentration measured by the sensor. And a control mechanism for controlling.

According to the present invention, the static pressure control device has a fresh air in the static pressure adjustment chamber, the static pressure adjustment chamber into which purified air and high-temperature gas obtained by combustion purification of exhaust gas discharged from the predetermined zone are introduced. A fresh air supply mechanism that supplies air, a high temperature gas concentration sensor that measures the high temperature gas concentration in the static pressure adjustment chamber, and a fresh air supply mechanism that drives the fresh air supply mechanism based on the high temperature gas concentration measured by the high temperature gas concentration sensor. And a control mechanism for controlling the amount of purified air and high-temperature gas introduced into the static pressure adjustment chamber by adjusting the pressure in the pressure adjustment chamber.
Thereby, based on the high temperature gas concentration in the static pressure adjustment chamber measured by the high temperature gas concentration sensor, the fresh air supply mechanism is driven, and fresh air is introduced into the static pressure adjustment chamber. As a result, the pressure in the static pressure adjustment chamber is adjusted, and the amount of purified air and the amount of high-temperature gas introduced can be controlled.

  The static pressure control device according to claim 2 is the static pressure control device according to claim 1, wherein the fresh air supply mechanism includes an air damper device capable of adjusting an opening degree, and the control mechanism includes the high-temperature gas. The amount of purified air introduced into the static pressure adjustment chamber and the high temperature are adjusted by adjusting the opening of the air damper device based on the high temperature gas concentration measured by the concentration sensor to adjust the pressure in the static pressure adjustment chamber. It is characterized by controlling the amount of gas.

According to this invention, the fresh air supply mechanism is configured to include the air damper device that can adjust the opening degree.
Thus, the opening degree of the air damper device is adjusted based on the high temperature gas concentration measured by the high temperature gas concentration sensor. As a result, the pressure in the static pressure adjustment chamber is adjusted by adjusting the amount of fresh air introduced into the static pressure adjustment chamber. For this reason, it is possible to easily and reliably control the amount of purified air and the amount of high-temperature gas introduced.

  ADVANTAGE OF THE INVENTION According to this invention, the static pressure control apparatus which can control the introduction amount of the purification air and high temperature gas obtained by carrying out the combustion purification of the exhaust gas discharged | emitted from the predetermined zone can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a painting facility 100 including a static pressure control device 800 of the present embodiment.
The painting facility 100 is a facility that paints the body of an automobile as an object to be painted. The painting system 110 that paints the object to be coated and the VOC contained in the exhaust discharged from the coating system 110. A VOC removal system 120 for removing, and a recycle system 130 for introducing the purified air purified by removing the VOC to the coating system 110 for recycling.

  The coating system 110 includes a plurality of coating zones 111 arranged along the conveyance direction of the object to be coated, an air supply device 112 that supplies air to the plurality of coating zones 111 by air conditioning, and air that has been conditioned. The air supply path 113 which distribute | circulates, and the drying furnace 114 which dries the to-be-coated object coated in the several coating zone 111 are provided.

  The air supply device 112 includes an air conditioner (not shown) that air-conditions fresh air and recycle gas (mixed gas of purified air and high-temperature gas) supplied by a static pressure control device 800 described later, and air that has been conditioned. An air supply fan (not shown) to be sent out.

  Inside the painting zone 111, facing the air supply path 113, the supplied air is diffused to reduce the speed, the pressure is increased, and the lower surface of the static pressure chamber 111A is temporarily closed, and the air is directed downward. An upper flow straightening plate 111B that is discharged downward, a painting chamber 111C located below the upper flow straightening plate 111B, a painting robot 111D that is disposed in the painting chamber 111C and paints an object to be coated, and an exhaust A supply path 115.

In the painting zone 111, the object to be coated is painted by the painting robot 111D.
In the air supply device 112, fresh air and recycle gas (mixed gas of purified air and high-temperature gas) supplied by a static pressure control device 800 described later are mixed and air-conditioned by an air conditioner, and an air supply path by an air supply fan. A plurality of coating zones 111 are supplied through 113.
The air supplied from the air supply device 112 is discharged from the plurality of painting zones 111 to the exhaust supply path 115 by an exhaust fan (not shown).

  The VOC removal system 120 includes a filter device 400 through which the exhaust gas discharged from the coating system 110 passes, an activated carbon filter device 500 provided downstream of the filter device 400 and through which the exhaust gas that has passed through the filter device 400 passes, and the activated carbon filter. And a regenerative combustion apparatus 300 that combusts and removes the VOC that has been adsorbed and concentrated by the adsorption apparatus 200 provided downstream of the apparatus 500.

  The filter device 400 is disposed on the flow path of the exhaust discharged from the coating system 110, and removes paint mist, coating debris, and the like contained in the exhaust discharged from the plurality of coating zones 111 and the drying furnace 114.

The activated carbon filter device 500 is provided on the downstream side of the activated carbon filter device 500 by adsorbing a part of the VOC contained in the exhaust discharged from the coating system 110 and gradually releasing the adsorbed part of the VOC. The VOC concentration in the exhaust gas supplied to the adsorption device 200 is adjusted.
Specifically, when the concentration of VOC contained in the exhaust gas is high, the activated carbon filter device 500 adsorbs a part thereof. Further, when the concentration of VOC contained in the exhaust gas passing through the activated carbon filter device 500 is low, a part of the VOC adsorbed by the activated carbon filter device 500 is released. Thereby, even when painting is not performed temporarily in the painting zone 111, the supply of VOC to the combustion apparatus 300 described later will not be interrupted.
Moreover, the activated carbon filter device 500 has an effect of removing a substance that hinders the VOC adsorption ability of zeolite used in the adsorption device 200 described later.

The combustion apparatus 300 burns and removes the VOC that has been adsorbed and concentrated by the adsorption apparatus 200 described later. The VOC adsorbed and concentrated by the adsorption device 200 is separated from the adsorption device 200 by the high-temperature gas supplied from the combustion device 300 and supplied to the combustion device 300. The combustion apparatus 300 is a three-column heat storage combustion apparatus, and a large amount of VOC is efficiently pyrolyzed. The VOC supplied to the combustion apparatus 300 is pyrolyzed at a high temperature of about 800 ° C. or higher, and is converted into a high-temperature gas mainly composed of water and carbon dioxide. This hot gas is recycled through a hot gas duct (inner tube) 720 described later, and its concentration is measured by a CO ₂ sensor 820 described later.
A part of the high-temperature gas (waste heat) generated when the VOC is burned and removed is used to remove the VOC adsorbed by the adsorption device 200. A part of the high-temperature gas is guided to the coating system 110 by a recycling system 130 described later.

  The recycling system 130 is provided downstream of the activated carbon filter device 500 described above, and is adsorbed by the adsorption device 200 that adsorbs and concentrates VOC in the exhaust gas that has passed through the activated carbon filter device 500, and is purified by passing through the adsorption device 200. Recycled duct (outer pipe) 730 that guides the purified air to the coating system 110 and a high-temperature gas duct (inner pipe) that guides part of the hot gas generated when the VOC is burned and removed by the combustion apparatus 300 to the coating system 110 720).

The adsorption device 200 has a cylindrical shape and includes zeolite as a VOC adsorbent. The exhaust gas that has passed through the activated carbon filter device 500 flows into the axial direction of the cylindrical adsorption device 200 and passes therethrough, so that VOC is adsorbed and removed.
Two adsorption devices 200 are arranged in parallel with respect to the flow path of the exhaust, and besides being used at the same time, for example, the main and sub can be used properly.
Further, the adsorption device 200 adsorbs VOC in an adsorption zone through which the exhaust gas that has passed through the activated carbon filter device 500 passes, and high-temperature gas generated in the combustion device 300 described later passes through the first high-temperature gas supply path 310. VOC is released in the passing release zone. The adsorption device 200 can be rotated around an axis by a motor (not shown), and the adsorption zone and the discharge zone are switched by the rotation.
The purified air purified by passing through the adsorption device 200 is guided to the coating system 110 by a recycle duct (outer pipe) 730 described later. Further, the released VOC is supplied to the above-described combustion apparatus 300 through the VOC supply path 320.

  The recycle duct (outer pipe) 730 is provided so as to surround the high temperature gas duct (inner pipe) 720, and the recycle duct (outer pipe) 730 and the high temperature gas duct (inner pipe) 720 form a double pipe structure 710. Is formed. The purified air flowing through the recycle duct (outer pipe) 730 is warmed by the high temperature gas flowing through the high temperature gas duct (inner pipe) 720. That is, as a means for warming the purified air to a predetermined temperature required when the purified air is supplied to the coating system 110, waste heat generated in the combustion device 300 is effectively used, and energy saving is achieved.

  Further, a part of the high temperature gas generated in the combustion apparatus 300 is supplied into a heat insulation duct 740 provided so as to surround a recycle duct (outer pipe) 730 to be described later, through a second high temperature gas supply path 738. In winter, the temperature of the purified air flowing through the recycle duct (outer pipe) 730 is reduced.

The recycle duct 730 and the high temperature gas duct 720 are respectively provided with mechanical interlock dampers 610 and 620 capable of discharging purified air and high temperature gas flowing through these ducts to the atmosphere. Thereby, the purified air and the high-temperature gas can be surely released to the atmosphere in the case of any abnormal situation.
For example, when the thermal decomposition temperature in the combustion apparatus 300 has not reached a certain temperature, such as when the combustion apparatus 300 is started up, the VOC removal system 120 has not sufficiently removed VOC. The mechanical interlock dampers 610 and 620 are opened to release purified air and high-temperature gas to the atmosphere, and recycling is not performed.

  The recycling system 130 also includes a static pressure control device 800 that controls the amount of recycled gas (purified air and high-temperature gas) recycled by the recycling system 130. This static pressure control device 800 can control the amount of purified air introduced and the amount of high-temperature gas, and can control the amount of recycled gas. Details of the static pressure control device 800 will be described later.

According to the above coating equipment 100, the exhaust discharged from the coating system 110 is guided again to the coating system 110 by the recycling system 130 after the paint mist, paint scum, and VOC are removed by the VOC removal system 120. It is recycled.
Further, since the high-temperature gas (waste heat) generated from the combustion device 300 used for VOC removal is used for warming the purified air to be recycled, energy saving is achieved.

Next, details of the static pressure control device 800 will be described.
FIG. 2 is a diagram showing a configuration of the static pressure control device 800. As described above, the static pressure control device 800 controls the amount of purified air and the amount of high-temperature gas that are recycled by the recycling system 130.

The static pressure control device 800 includes a static pressure adjustment chamber 850 having an introduction port 860 through which purified air and high-temperature gas recycled by the above-described recycling system 130 are introduced, and fresh air supply for supplying fresh air to the coating system 110. an air damper device 810 as a mechanism, a CO ₂ sensor 820 as a high-temperature gas concentration sensor for measuring the hot gas concentration of the hydrostatic adjusting chamber 850, on the basis of the hot gas concentration measured by the CO ₂ sensor 820, Recycling that controls the amount of purified air and high-temperature gas to be recycled in addition to the amount of fresh air supplied to the coating system 110 by adjusting the pressure in the static pressure adjustment chamber 850 by driving the fresh air supply mechanism. ECU 830 (not shown) as a control mechanism.

The air damper device 810 includes a motor 812 and a plurality of multiblade dampers 811 whose opening degree can be adjusted by the motor 812. The opening degree of the multiblade damper 811 is adjusted by a control signal from the ECU 830.
ECU830 is connected to the CO ₂ sensor 820, the detection signal of the CO ₂ sensor 820 is supplied to ECU830. The ECU 830 shapes an input signal waveform from the CO ₂ sensor 820, corrects the voltage level to a predetermined level, converts an analog signal value into a digital signal value, and a central processing unit ( Hereinafter referred to as a CPU). In addition, the ECU 830 includes a storage circuit that stores various calculation programs executed by the CPU, calculation results, and the like, and an output circuit that outputs a control signal to the air damper device 810.

  Further, in the static pressure adjustment chamber 850, a gas burner 840 for warming the introduced fresh air and purified air, partition filters 871, 872, an air supply fan 880 for guiding the air to the coating system 110, an air supply Roads 891 and 892.

The operation of the above static pressure control apparatus 800 will be described.
First, purified air and high-temperature gas are introduced into the static pressure adjustment chamber 850 from the inlet 860 by the above-described recycling system 130. The high-temperature gas concentration in the static pressure adjustment chamber 850 is detected by the CO ₂ sensor 820, and the detection signal is supplied to the ECU 830. Next, a control signal is output from the ECU 830 to the air damper device 810, and the opening degree of the multiblade damper 811 is adjusted based on the detected high-temperature gas concentration.

  When the multi-blade damper 811 is fully opened, a large amount of fresh air is introduced into the static pressure adjustment chamber 850 and the negative pressure in the static pressure adjustment chamber 850 becomes low. The amount of hot gas is greatly reduced. On the contrary, when the multiblade damper 811 is fully closed, the negative pressure in the static pressure adjusting chamber 850 is increased, and thus the state is 100% recycled.

That is, when the hot gas concentration detected by the CO ₂ sensor 820 exceeds the set value, the opening of the multi-blade damper 811 is increased to increase the amount of fresh air introduced, thereby increasing the amount of fresh air inside the static pressure adjusting chamber 850. The negative pressure can be lowered to reduce the amount of purified air and high-temperature gas that are recycled. On the other hand, when the high-temperature gas concentration detected by the CO ₂ sensor 820 is less than the set value, the opening of the multi-blade damper 811 is reduced to reduce the amount of fresh air introduced, thereby reducing the inside of the static pressure adjustment chamber 850. The amount of purified air to be recycled and the amount of hot gas can be increased by increasing the negative pressure.
As described above, the static pressure control device 800 acts as an exhaust gas recycle control device in the painting facility 100 including the painting system 110, the VOC removal system 120, and the recycling system 130.

  The fresh air introduced from the air damper device 810, the purified air introduced from the inlet 860, and the high-temperature gas are mixed in the static pressure adjustment chamber 850 and heated by the gas burner 840. The mixed gas heated by the gas burner 840 passes through the partition filters 871 and 872, and is then guided to the coating system 110 by the supply fan 880 through the supply passages 891 and 892.

According to the above static pressure control apparatus 800, the following effects are produced.
The static pressure control device 800 of the painting facility 100 that can purify and recycle the VOC contained in the exhaust gas generated by painting is provided with an inlet 860 through which purified air and high-temperature gas recycled by the recycling system 130 are introduced. A static pressure adjustment chamber 850, a fresh air supply mechanism for supplying fresh air to the coating system 110, a CO ₂ sensor 820 as a high temperature gas concentration sensor for measuring a high temperature gas concentration in the static pressure adjustment chamber 850, and a CO 2 _The amount of fresh air supplied to the coating system 110 and the recycled purification are adjusted by driving the fresh air supply mechanism based on the high temperature gas concentration measured by the _two sensors 820 and adjusting the pressure in the static pressure adjustment chamber 850. ECU 830 as a recycle control mechanism for controlling the amount of air and the amount of high-temperature gas.
Thereby, in the painting facility 100 that can purify and recycle VOC contained in the exhaust gas generated by painting, according to the hot gas concentration in the static pressure adjustment chamber 850 into which purified air and hot gas are introduced, It became possible to control the amount of recycled gas (purified air and high-temperature gas). As a result, safe and stable recycling operation of the painting facility 100 has become possible.

Moreover, the fresh air supply mechanism was comprised with the air damper apparatus 810 which can adjust an opening degree. Thereby, the opening degree of the air damper device 810 is adjusted based on the high temperature gas concentration measured by the CO ₂ sensor 820, the amount of fresh air supplied to the coating system 110, the amount of purified air to be recycled, and the amount of high temperature gas. Can be easily and reliably controlled.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in this embodiment, the multiblade damper 811 is used as the air damper device 810 corresponding to the fresh air supply mechanism, but a rotary damper or the like may be used.
The static pressure control device 800 of the present invention can also be applied to a cogeneration system by collecting the introduced purified air and high-temperature gas with a boiler.

It is a figure which shows the structure of the coating equipment provided with the static pressure control apparatus of this invention. It is a figure which shows the structure of the static pressure control apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Coating equipment 110 Coating system 120 VOC removal system 130 Recycling system 200 Adsorption device 300 Combustion device 400 Filter device 500 Activated carbon filter device 800 Static pressure control device 810 Air damper device 811 Multiblade damper 812 Motor 820 CO ₂ sensor 830 ECU
850 Static pressure adjustment chamber 860 Inlet

Claims (1)

A static pressure adjusting chamber which hot gas is introduced which is obtained by burning a VOC adsorbed when purifying the purified air and exhaust obtained by purification of the exhaust discharged from the predetermined zone,
A fresh air supply mechanism that is provided in the static pressure adjustment chamber and supplies fresh air into the static pressure adjustment chamber;
A high temperature gas concentration sensor that is provided in the static pressure adjustment chamber and measures a high temperature gas concentration in the static pressure adjustment chamber;
The amount of purified air introduced into the static pressure adjustment chamber by driving the fresh air supply mechanism and adjusting the pressure in the static pressure adjustment chamber based on the high temperature gas concentration measured by the high temperature gas concentration sensor And a control mechanism for controlling the amount of high-temperature gas ,
The fresh air supply mechanism includes an air damper device capable of adjusting the opening degree,
When the high temperature gas concentration measured by the high temperature gas concentration sensor exceeds a set value, the control mechanism increases the opening of the air damper device to increase the amount of fresh air introduced, and the static pressure adjustment chamber When the high-temperature gas concentration measured by the high-temperature gas concentration sensor is less than a set value, the amount of purified air introduced into the static pressure adjustment chamber and the amount of high-temperature gas are reduced. Reduce the amount of fresh air introduced by reducing the opening of the air damper device, increase the negative pressure in the static pressure adjustment chamber, and increase the amount of purified air and high-temperature gas introduced into the static pressure adjustment chamber static pressure control device, characterized in that letting.

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