JP4661604B2 - Organic solvent removal system - Google Patents

Description

  The present invention relates to an organic solvent removal system for suppressing volatile organic compound (VOC) emission, which is used in an open cleaning tank for cleaning industrial parts and the like using an organic solvent.

  In recent years, from the viewpoint of preventing air pollution, there has been a demand for suppression of volatile organic compound (VOC) emissions, that is, prevention of transpiration of organic solvents into the atmosphere in a cleaning process for industrial parts using an open cleaning tank. Yes. In order to solve this, various organic solvent removal systems have been developed.

  Conventionally, this type of organic solvent removal system is known in which a duct for collecting organic solvent vapor is disposed around the upper edge of an open cleaning tank and connected to a suction blower and a recovery device (for example, , See Patent Document 1).

  The system will be described below with reference to FIG.

  First, the mechanism of the open cleaning tank will be described with reference to FIG. Reference numeral 101 denotes a cleaning tank, which is internally divided into a liquid tank 102 and a vapor tank 103, and the liquid organic solvent 104 is stored in the liquid tank 102, and a small amount of liquid organic solvent 104 is immersed in the bottom of the vapor tank 103. The heater 105 is provided. A cooling pipe 106 is arranged around the inside of the outer wall 107 of the cleaning tank 101.

  Next, the cleaning process will be described with reference to FIG. The cleaning object 108 is first washed by immersing it in the liquid organic solvent 104 in the liquid tank 102 from above by a crane 109 as an elevating means, then exposed to the organic solvent vapor filled in the vapor tank 103 and then steam cleaned. The cleaning process is completed by pulling upward. In the washing tank 101, the liquid organic solvent 104 heated and boiled by the heater 105 evaporates and fills the vapor tank 103 as an organic solvent vapor, and a vapor formed at the lower height of the cooling pipe 106. It floats as a high-concentration vapor layer 111 in a space below the line 110. The vapor line 110 is a boundary layer that separates the high-concentration vapor layer 111 and the low-concentration vapor layer 112. In general, the organic solvent vapor has a specific gravity heavier than air, and the cooling pipe 106 is sufficiently cooled by passing cooling water. In this case, the boundary layer exists stably because the organic solvent vapor condenses and prevents the upward diffusion as the volume decreases. However, when the cleaning object 108 is pulled up as in the cleaning process, a part of the high-concentration organic solvent vapor is also taken out as the cleaning object 108 rises, and overflows from the upper edge 113 of the cleaning tank 101 as indicated by an arrow c. . At that time, since the specific gravity of the organic solvent vapor is heavier than that of air, it overflows along the upper edge 113 and diffuses downward around the cleaning tank 101. Although the low-concentration vapor layer 112 has a lower organic solvent vapor concentration than the high-concentration vapor layer 111, the low-concentration vapor layer 112 diffuses slowly in the cleaning tank 101 even when the cleaning product 108 does not enter or exit, and it is little by little. It is dissipated above the cleaning tank 101.

  In the conventional organic solvent removal system, a duct 121 is disposed around the upper edge 113 of the cleaning tank 101, and the duct 121 has an opening in the lateral direction inside the cleaning tank 101 in order to collect the organic solvent vapor. The collected organic solvent vapor is sucked by the suction blower 124 through the pipe 123, and is adsorbed by an adsorbent, thermally desorbed and concentrated by vapor, and liquefied by cooling (both in the recovery device 125). It is recovered as a liquid organic solvent through (not shown). The collection of the organic solvent vapor by such a collection method is extremely effective in preventing the organic solvent vapor from being diffused to the upper part of the washing tank 101 when the washed product 108 does not come in and out in the washing process described above. Means.

  However, in such a conventional organic solvent recovery system, when the cleaning object 108 is pulled up in the cleaning process, a part of the high-concentration organic solvent vapor is also taken out along with the rising of the cleaning object 108, and the cleaning tank 101 is indicated by an arrow c. In the duct 121 that overflows from the upper edge 113 and opens in the lateral direction inside the cleaning tank 101, the high-concentration organic solvent vapor cannot be sufficiently collected.

Further, when the suction air volume of the suction blower 124 is increased to sufficiently collect the high-concentration organic solvent vapor, the air flow in the vicinity of the low-concentration vapor layer 112 is generated because the opening 122 faces the inside of the cleaning tank 101. The vapor line 110 separating the high-concentration vapor layer 111 and the low-concentration vapor layer 112 is disturbed, and a large amount of organic solvent is sucked up by unnecessarily winding up the high-concentration organic solvent vapor. The capacity of the recovery device 125 needs to be increased.
Japanese Utility Model Publication No. 2-33224 (page 1-2, Fig. 1)

  In such a conventional organic solvent removal system, there is an effect of preventing the diffusion of the organic solvent vapor when there is no washing in / out, but when there is the washing in / out, the high concentration that is taken out with the washing to be lifted. There was a problem that the organic solvent vapor could not be sufficiently collected, and the organic solvent vapor diffused around the washing tank to deteriorate the working environment. Further, when the suction air volume is increased to avoid this, the amount of the organic solvent vapor to be sucked increases, which causes a problem that the processing apparatus becomes large and costs increase.

  The present invention solves such conventional problems, and provides a system that can reliably collect organic solvent vapor and prevent deterioration of the surrounding working environment, and can be manufactured in a compact and inexpensive manner. The purpose is to do.

In order to achieve the above object, the organic solvent removal system of the present invention is disposed around the upper edge of the cleaning tank that stores the organic solvent and is open at the top, and at least upward to suck the vapor of the organic solvent. A suction duct having an opened suction port; and a treatment device connected to the suction duct for recovering or decomposing the organic solvent vapor, and having a partition wall erected on the outer periphery of the upward opening of the suction port. A chamber as a space is provided on the outer peripheral portion of the outer wall of the cleaning tank below the suction port .

By this means, it is possible to ensure the collection of the organic solvent vapor even when the cleaning object enters and leaves, and to prevent the surrounding work environment from deteriorating. In addition, this makes it possible to further ensure the collection of the organic solvent vapor taken out together with the cleaning object. In addition, this makes it possible to uniformly suck the organic solvent vapor from the suction port around the upper edge, thereby further ensuring the collection of the organic solvent vapor.

  The suction ports of other means are opened both in the upward direction and in the lateral direction inside the cleaning tank.

  Thereby, the collection of the organic solvent vapor can be further ensured.

  Further, the suction duct of another means has a curved surface shape from the upper surface to the lateral surface inside the cleaning tank, and the suction port of the suction duct opens from the upper surface to the lateral surface including the curved surface shape. It is.

  Thereby, the collection of the organic solvent vapor can be further ensured.

  Another means is provided with an opening / closing mechanism in the upward opening of the suction port.

  Thereby, the suction | attraction amount of organic solvent vapor | steam can be minimized and a processing apparatus can be manufactured compactly and cheaply.

  The other means is provided with a control means for opening and closing the opening / closing mechanism when the washing object is taken in and out of the washing tank.

  As a result, the suction air volume of the organic solvent vapor can be further reduced to the necessary minimum.

  In addition, the other means has an elevating means for taking the washing object into and out of the washing tank and is provided with a control means for opening the opening / closing mechanism when the elevating means is operated.

  As a result, the suction air volume of the organic solvent vapor can be further reduced to the necessary minimum.

  The other means is provided with a sensor for detecting the movement of the cleaning object, and provided with a control means for opening and closing the opening / closing mechanism when the sensor detects that the cleaning object is taken in and out of the cleaning tank.

  As a result, the suction air volume of the organic solvent vapor can be further reduced to the necessary minimum.

  As another means, an infrared detection type sensor is used to detect the movement of the cleaning object.

  Thereby, the cost of the sensor can be reduced.

  In addition, the other means is provided with a blowing means capable of appropriately adjusting the suction air volume as necessary when sucking the vapor of the organic solvent stored in the cleaning tank from the suction port of the suction duct.

  Thereby, the suction | attraction amount of organic solvent vapor | steam can be minimized and a processing apparatus can be manufactured compactly and cheaply.

Another means is that when sucking the organic solvent vapor stored in the cleaning tank from the suction port of the suction duct, the suction air volume is changed from 0.5 m ³ per minute per 1 m of the upper edge length of the cleaning tank. It is provided with air blowing means that can be adjusted within a range of 5.0 m ³ .

  This ensures the collection of the organic solvent vapor and prevents the vapor line from being disturbed and unnecessarily winding up the high concentration organic solvent vapor, thereby making it possible to manufacture the processing apparatus in a compact and inexpensive manner.

  The other means is that when the organic solvent vapor stored in the cleaning tank is sucked from the suction port of the suction duct, when the opening / closing mechanism of the upper opening of the suction port is opened, the suction air volume of the blower means Is increased to a predetermined amount.

  Thereby, collection of organic solvent vapor | steam can be ensured and the surrounding working environment can be prevented from deteriorating.

  In addition, the other means is provided with a detector for detecting the concentration of the organic solvent vapor in the processing apparatus, and when the vapor of the organic solvent stored in the cleaning tank is sucked from the suction port of the suction duct, the detector is more than a predetermined amount. When the organic solvent vapor concentration is detected, the suction air volume of the blowing means is increased to a predetermined amount.

  Thereby, the collection of the organic solvent vapor can be further ensured, and deterioration of the surrounding work environment can be prevented in advance.

  According to the present invention, it is possible to provide an organic solvent removal system that ensures the collection of organic solvent vapor even when there is an incoming / outgoing cleaning object and prevents deterioration of the surrounding work environment.

  Further, the organic solvent vapor can be uniformly sucked from the suction port around the upper edge, and the collection of the organic solvent vapor can be further ensured.

  In addition, the suction volume of the organic solvent vapor can be minimized, and the processing apparatus can be made compact and inexpensive.

  Further, it is possible to prevent the vapor line from being disturbed and to unnecessarily wind up high-concentration organic solvent vapor, and to manufacture the processing apparatus in a compact and inexpensive manner.

  In addition, the cost of the sensor can be reduced.

  In addition, the system can be made compact and the installation workability can be improved.

According to the first aspect of the present invention, in the suction duct disposed around the upper edge of the cleaning tank in which the organic solvent is stored and the upper side is open, the suction port for sucking the organic solvent vapor is at least above. Since the organic solvent vapor does not overflow from the top edge of the washing tank even when there is an incoming / outgoing cleaning object, the organic solvent vapor is surely collected without any deterioration of the surrounding work environment. It has the action. In addition, since the partition wall is erected on the outer periphery of the upward opening of the suction port, it has the effect of further ensuring the collection of the organic solvent vapor. In addition, since a chamber as a space is provided on the outer peripheral part of the outer wall of the cleaning tank below the suction port, the organic solvent vapor can be uniformly sucked from the suction port around the upper edge, thereby further reliably collecting the organic solvent vapor. Has the effect of

The invention according to claim 2 of the present invention has an effect of further ensuring the collection of the organic solvent vapor since the suction port is opened both in the upward direction and in the lateral direction inside the cleaning tank.

According to a third aspect of the present invention, the suction duct forms a curved surface shape from the upper surface to the lateral surface inside the cleaning tank, and the suction port of the suction duct extends from the upper surface to the lateral surface including the curved surface shape. Since it is open, it has the effect of further ensuring the collection of the organic solvent vapor.

According to the fourth aspect of the present invention, since the opening / closing mechanism is provided in the upward opening of the suction port, the suction amount of the organic solvent vapor is minimized, and the processing apparatus can be manufactured in a compact and inexpensive manner.

The invention according to claim 5 of the present invention is provided with a control means that opens and closes the opening / closing mechanism when the washing object is taken in and out of the washing tank, so that the suction air volume of the organic solvent vapor can be further minimized. Have.

The invention according to claim 6 of the present invention has an elevating means for taking a washing object into and out of the washing tank, and provided with a control means for opening the opening / closing mechanism when the elevating means is operated. The suction air volume can be further reduced to the necessary minimum.

Since the invention according to claim 7 of the present invention is provided with a sensor for detecting the movement of the cleaning object, and provided with a control means for opening and closing the opening / closing mechanism when the sensor detects the insertion / extraction of the cleaning object into / from the cleaning tank, It has the effect that the amount of suction air of the organic solvent vapor can be further minimized.

The invention according to claim 8 of the present invention has an effect that the cost of the sensor can be reduced because the sensor for detecting the movement of the cleaning object is of the infrared detection type.

The invention according to claim 9 of the present invention is provided with a blowing means that can appropriately adjust the suction air volume as necessary when sucking the vapor of the organic solvent stored in the cleaning tank from the suction port of the suction duct. It has the effect that the suction volume of the organic solvent vapor is minimized, and the processing apparatus can be manufactured in a compact and inexpensive manner.

The invention of claim 1 0, wherein the present invention, a vapor of an organic solvent which is stored in the cleaning tank, when the suction from the suction port of the suction duct, the upper end edge length 1m per per minute 0 of the cleaning tank the amount of suction air. because having a blowing means which is adjustable in a range of min 5.0 m ³ from 5 m ^3, as well as to ensure the collection of the organic solvent vapor, winding unnecessary high concentration organic solvent vapor of the vapor line is disturbed This has the effect that the processing apparatus can be manufactured in a compact and inexpensive manner.

The invention of claim 1 1, wherein the present invention, a vapor of an organic solvent which is stored in the cleaning tank, when the suction from the suction port of the suction duct, when the closing mechanism of the upward opening of the suction port was opened, Since the suction air volume of the air blowing means is increased to a predetermined amount, the organic solvent vapor is reliably collected and the surrounding work environment is prevented from being deteriorated.

The invention of claim 1 2 wherein the present invention is provided with a detector for detecting the organic solvent vapor concentration in the processing apparatus, a vapor of an organic solvent which is stored in the cleaning tank, when the suction from the suction port of the suction duct, When the detector detects a concentration of organic solvent vapor above a predetermined level, the suction air volume of the air blowing means is increased to a predetermined level, so that the collection of organic solvent vapor is further ensured and the surrounding work environment is prevented from deteriorating. It has the action.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 is a cross-sectional configuration diagram of an organic solvent removal system according to Embodiment 1 of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part of the organic solvent removal system according to Embodiment 1 of the present invention, and FIG. It is a top view of the organic solvent removal system in form 1. 1, 2, and 3, the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 1 and FIG. 2, reference numeral 1 denotes a suction duct disposed around the upper edge 113 of the cleaning tank 101. The suction port 2 for sucking the vapor of the organic solvent 104 serves as an upward opening on the upper surface 3. The lateral opening 6 is provided in the lateral surface 5 inside the cleaning tank 101. 7 is a partition wall provided on the outer periphery of the upward opening 4, and 8 is an opening / closing mechanism provided in the upward opening 4. Reference numeral 9 denotes a chamber as a space provided on the outer peripheral portion of the outer wall 107 of the cleaning tank 101 below the suction port 2, and the pipe 10 is connected to the lowermost part in the first embodiment of the present invention. In the plan view seen from above, the suction duct 1 is uniformly arranged around the upper edge 113 of the cleaning tank 101 as shown in FIG. 3, and the suction port 2 is elongated in the first embodiment of the present invention. The slit is open.

  Reference numeral 11 denotes a processing apparatus, which includes a blower 12 as a blowing means, a detector 13 for detecting the concentration of organic solvent vapor, a processing unit 14 for treating an organic solvent, and a controller 15 as a control means. In addition, the processing unit 14 is connected to the exhaust pipe 16. The controller 15 is electrically connected to the opening / closing mechanism 8, the blower 12, the detector 13, the processing unit 14, and the like via an electrical wiring 17. Reference numeral 109 denotes a crane as an elevating means for allowing the cleaning object 108 to be taken in and out of the cleaning tank 101. In the first embodiment of the present invention, the blower 12 and the controller 15 are provided in the processing device 11. As a result, the system can be made compact and the installation workability can be improved.

  Next, the operation in the first embodiment will be described. The organic solvent vapor in the vicinity of the upper edge 113 of the cleaning tank 101 is collected in the suction duct 1 from the suction opening 2 of the lateral opening 6 and the upward opening 4 by the blower 12 and passes through the pipe 10 to the processing device. 11 processing units 14. In the first embodiment of the present invention, the sent organic solvent vapor is subjected to adsorption process by an adsorbent, desorption concentration by heating, and liquefaction process by cooling (both are not shown) in the processing unit 14, thereby forming a liquid organic solvent. The gas after being recovered and removed is discharged from the exhaust pipe 16 to the outside. Here, as a method for treating the organic solvent vapor, there is a method of collecting it as concentrated high-concentration vapor in addition to liquefaction recovery and returning it to the washing tank 101. In addition, the organic solvent vapor is decomposed and harmless by catalytic combustion or plasma decomposition without recovery. There is also a method of processing. Furthermore, as a concentration method, there is also a method of performing adsorption / desorption by a pressure difference without using heat. The method for collecting organic solvent vapor by the suction duct 1 of the present invention is effective in any processing method.

  When the cleaning product 108 does not enter and exit in the cleaning process, the organic solvent vapor in the vicinity of the low-concentration vapor layer 112 in the upper part of the cleaning tank 101 is changed in the horizontal direction in order to prevent the organic solvent vapor from escaping above the cleaning tank 101. It collects in the suction duct 1 from the suction port 2 of the opening part 6 and the upward direction opening part 4, and sends to a processing apparatus. At this time, since the lateral opening 6 of the suction port 2 faces toward the inside of the cleaning tank 101, the suction from the lateral opening 6 can be collected with a small amount of suction air, which is effective. . On the other hand, when the cleaning product 108 is pulled up in the cleaning process, a part of the high-concentration organic solvent vapor is taken out as the cleaning product 108 rises and overflows from the upper edge 113 of the cleaning tank 101 to the outside as indicated by an arrow a. And At this time, since the upward opening 4 is opened directly under the path of the organic solvent vapor to be overflowed, the high-concentration organic solvent vapor is effectively collected by suction from the upward opening 4. Furthermore, the presence of the partition wall 7 can enhance the effect of preventing leakage of the high-concentration organic solvent vapor. This can prevent deterioration of the working environment around the cleaning tank 101.

  Further, a chamber 9 as a space is provided below the suction port 2, and this tends to increase the amount of suction air in the suction port 2 near the pipe connection portions 18 (four locations) shown in the plan view of FIG. 3. On the other hand, since the pressure in the suction duct 1 is made uniform by the chamber 9 and the appropriate air volume can be sucked from any suction port 2, the organic solvent vapor can be reliably collected.

  Next, a control method for further reliably collecting the organic solvent vapor will be described. As shown in the enlarged cross-sectional view of the main part of FIG. 2, an opening / closing mechanism 8 is provided in the upward opening 4 of the suction port 2. “Open”, otherwise “Closed”. This means that when the cleaning object 108 does not come in and out, when collecting from the suction port 2 for the purpose of preventing the diffusion of the organic solvent vapor to the upper part of the cleaning tank 101, the horizontal direction without using the upper opening 4 is used. This is because it is more effective to collect from the opening 6 only with the minimum necessary suction air volume. That is, the processing capacity of the processing apparatus 11 can be reduced by reducing the suction air volume, and the system can be manufactured in a compact and inexpensive manner. In addition, as an example of a specific means of “opening” when the cleaning object 108 is taken in and out of the cleaning tank 101, a controller 15 that opens and closes the opening / closing mechanism 8 when the crane 109 as the lifting means is operated. It is effective to provide it.

  Next, an air volume adjustment method for more reliably collecting the organic solvent vapor will be described. The blower 12 of FIG. 1 is adjusted by the controller 15 so as to have an appropriate suction air volume. The appropriate suction air flow here means that the organic solvent vapor cannot be sufficiently collected if the suction air flow is too small, and if the suction air flow is too large, the air flow near the low-concentration vapor layer 112 is disturbed, resulting in high-concentration vapor. The vapor line 110 separating the layer 111 and the low-concentration vapor layer 112 is disturbed, and a large amount of the organic solvent vapor is sucked up unnecessarily, so that a large amount of the organic solvent is sucked. There is a problem that it has to be, it refers to the appropriate air volume range determined from these conditions. Here, “low concentration” and “high concentration” refer to low concentration = about 50 to 100 ppm and high concentration = about 10 to 20%.

According to an experiment using dichloromethane (methylene chloride) as an example of an organic solvent, in a washing tank 101 having a width of 2 m and a depth of 1 m, 1 m ³ per minute from the periphery of the upper edge 113 (length 6 m) (per minute per 1 m of the upper edge) When suctioned with an air volume of 0.17 m ³ ), the organic solvent vapor above the cleaning tank 101 could not be collected sufficiently. In addition, when sucked at a flow rate of 12 m ³ per minute (up to 2 m ³ per m of the top edge) from the periphery of the upper edge 113 (length 6 m), the sucked organic solvent vapor concentration was about 100 ppm. When sucked at an air volume of 36m ³ (6m ³ per minute per 1m of upper edge), the concentration rises to about 400ppm (4 times) by unnecessarily hoisting high concentration organic solvent vapor. It was found that the total amount of steam increased to about 12 times. As a result, in the first embodiment of the present invention, it is desirable to adjust the range of min 5.0 m ³ of the suction air amount from the upper edge 113 length 1m per per minute 0.5 m ³ of the cleaning tank 101.

Next, an air volume control method for further reliably collecting the organic solvent vapor will be described. If there is no entry / exit of the cleaning object 108, it may be adjusted to the above-described appropriate suction air volume range in order to collect from the suction port 2 for the purpose of preventing the organic solvent vapor from escaping above the cleaning tank 101.
When the cleaning product 108 is pulled up in the cleaning process, it is necessary to reliably collect a part of the high-concentration organic solvent vapor taken along with the rising of the cleaning product 108 from the suction port 2 of the upward opening 4. The controller 15 controls the suction air volume of the blower 12 to be increased to a predetermined amount, for example, three times the normal air volume. As a result, the organic solvent vapor does not overflow from the washing tank 101, and the surrounding work environment can be prevented from deteriorating. It should be noted that the timing of increasing the suction air volume is desirably performed when the opening / closing mechanism 8 of the upward opening 4 is opened, but in addition to that, the detector 13 for detecting the organic solvent vapor concentration has a predetermined or higher organic content. It may be performed when a solvent vapor concentration, for example, a concentration of 400 ppm or more is detected. This is because when the concentration of the organic solvent vapor sucked from above the cleaning tank 101 becomes abnormally high (for example, when the vapor line 110 is raised due to a malfunction of the cooling pipe 106), the high concentration organic solvent vapor is at the upper edge. This is because it may overflow from the cleaning tank 101 to the outside of the cleaning tank 101, and in this case, it is necessary to increase the suction air volume to prevent leakage.

(Embodiment 2)
FIG. 4 is an enlarged cross-sectional view of a main part of the organic solvent removal system according to Embodiment 2 of the present invention. 4, the same components as those in FIGS. 1, 2, 3, and 6 are denoted by the same reference numerals, and the description thereof is omitted.

  In Embodiment 2 of FIG. 4, the cross-sectional shape of the suction duct 1 forms a curved surface shape 51 from the upper surface 3 to the lateral surface 5 inside the cleaning tank 101, and the suction port 2 of the suction duct 1 has a curved surface shape. An opening is formed from the upper surface 3 including 51 to the lateral surface 5.

  In this configuration, the organic solvent that tends to overflow from the upper edge 113 to the outside of the cleaning tank 101 when the cleaning object 108 is pulled up in the cleaning process or when the concentration of the organic solvent vapor above the cleaning tank 101 becomes abnormally high. Since the vapor flows as shown by an arrow b, the organic solvent vapor is reliably collected by the suction port from the upper surface 3 to the lateral surface 5 including the curved surface 51, and the working environment around the cleaning tank 101 is deteriorated in advance. It can be prevented.

(Embodiment 3)
FIG. 5 is a cross-sectional configuration diagram of an organic solvent removal system according to Embodiment 3 of the present invention. In FIG. 5, the same components as those in FIGS. 1, 2, 3, and 6 are denoted by the same reference numerals and description thereof is omitted.

  In Embodiment 3 of FIG. 5, the sensor 52 that detects the movement of the cleaning object 108 is provided at the upper edge 113 of the cleaning tank 101.

  In this configuration, the controller 15 performs control so that the opening / closing mechanism 8 is opened when the sensor 52 detects that the cleaning object 108 is put in and out of the cleaning tank 101. For example, the controller 15 performs manual cleaning without using the crane 109. Even when the article 108 is taken in and out of the washing tank 101, the opening / closing mechanism 8 is reliably controlled. As a result, since the suction air volume of the organic solvent vapor can be further reduced to the necessary minimum, the processing capacity of the processing apparatus 11 can be reduced, and the system can be manufactured in a compact and inexpensive manner. The sensor 52 only needs to detect the movement of an object, and generally an infrared detection type is inexpensive and excellent.

  INDUSTRIAL APPLICABILITY The present invention is useful as an organic solvent removal system for suppressing emission of volatile organic compounds (VOC) used in an open cleaning tank that cleans industrial parts and the like using an organic solvent. Moreover, it can be applied to the use of emission control of harmful substances other than organic solvents.

Cross-sectional block diagram which shows the organic-solvent removal system of Embodiment 1 of this invention The principal part expanded sectional view of Embodiment 1 of this invention The same top view of Embodiment 1 of this invention The principal part expanded sectional view which shows the organic solvent removal system of Embodiment 2 of this invention Sectional block diagram which shows the organic-solvent removal system of Embodiment 3 of this invention Cross-sectional configuration diagram showing a conventional organic solvent removal system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suction duct 2 Suction port 3 Upper surface 4 Upper opening 5 Lateral surface 7 Bulkhead 8 Opening / closing mechanism 9 Chamber 11 Processing device 12 Blower 13 Detector 15 Controller 51 Curved shape 52 Sensor 101 Cleaning tank 104 Organic solvent 107 Outer wall 108 Cleaning object 109 Crane 113 Upper edge

Claims (12)

A suction duct that is disposed around the upper edge of the cleaning tank that stores the organic solvent and is open at the top and has a suction port that opens at least upward to suck the vapor of the organic solvent, and collects the organic solvent vapor Or a processing device connected to the suction duct for disassembly, and having a partition wall erected on the outer periphery of the upward opening of the suction port, and on the outer peripheral portion of the outer wall of the cleaning tank below the suction port , provided a chamber as a space, organic solvent removal system. Suction port is opened on both lateral cleaning tank inside the upward direction, according to claim 1 Symbol placement organic solvent removal system. The suction duct has a curved surface shape from an upper surface to a lateral surface inside the cleaning tank, and the suction port of the suction duct opens from the upper surface including the curved shape to the lateral surface. 2. The organic solvent removal system according to 2. The organic solvent removal system according to claim 2 or 3 , wherein an opening / closing mechanism is provided in the upward opening of the suction port. The organic solvent removal system according to claim 4 , further comprising a control unit that opens the opening / closing mechanism when the washed product is taken in and out of the washing tank. 5. The organic solvent removal system according to claim 4 , further comprising a lifting / lowering means for taking the washing item into and out of the washing tank, and a control means for opening the opening / closing mechanism when the lifting / lowering means is operated. The organic solvent removal system according to claim 4 , further comprising a sensor that detects movement of the cleaning object, and a control unit that opens and closes the opening / closing mechanism when the sensor detects that the cleaning object is put into and out of the cleaning tank. . The organic solvent removal system according to claim 7 , wherein the sensor that detects the movement of the cleaning object is an infrared detection method. The vapor of the organic solvent which is stored in the cleaning tank, when the suction from the suction port of the suction duct, equipped with appropriate adjustable and the blowing means as necessary suction air amount, according to any one of claims 2-8 Organic solvent removal system. The vapor of the organic solvent which is stored in the cleaning tank, when the suction from the suction port of the suction duct, ranges suction air amount from the upper end edge length 1m per per minute 0.5 m ³ of the washing tub per minute 5.0 m ³ The organic solvent removal system according to any one of claims 2 to 8 , further comprising an air blowing means that can be adjusted. When the organic solvent vapor stored in the cleaning tank is sucked from the suction port of the suction duct, the suction air volume of the blowing means is increased to a predetermined amount when the opening / closing mechanism of the upper opening of the suction port is opened. The organic solvent removal system according to any one of claims 4 to 10 . A detector for detecting the concentration of the organic solvent vapor is provided in the processing apparatus, and when the vapor of the organic solvent stored in the washing tank is sucked from the suction port of the suction duct, the detector has an organic solvent vapor concentration that exceeds a predetermined level. The organic solvent removal system according to any one of claims 1 to 11, wherein, when detected, the suction air volume of the blowing means is increased to a predetermined amount.

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