JP4767078B2 - Drain collection processing device - Google Patents

Description

  The present invention relates to a drain recovery processing apparatus for recovering and processing drain containing compressed air in a part discharged from an air compressor.

  Many air compressors are used to supply working air and instrument air in factories and plant facilities. In the air compressor, moisture in the air is condensed in the compression process, and further contains lubricating oil used in the air compressor, and these are discharged out of the system as drain through a drain trap. Since the drain contains oil, it cannot be discharged directly to the sewer, etc., so the oil is removed and only clean water is discharged. Various methods have been proposed for removing oil contained in the drain (see, for example, Patent Document 1).

For example, in Patent Document 1, it is assumed that methods such as flotation separation by specific gravity difference and adsorption method using activated carbon or adsorbent, which are generally used as oil-water separation methods, each have problems, and electrolytic treatment means and adsorption treatment means are provided. Techniques for solving these problems in an organic combination have been proposed.
JP 2003-260307 A

  In the technique described in Patent Document 1, drain water containing charged oil particles is electrolyzed to such an extent that excessive flocs are not generated to remove the repulsive force of the oil particles, and further, fine oil bubbles are blown into the oil particles. It is agglomerated to an optimum size and adsorbed on an adsorbent, and seems to be a useful method, but it cannot be said that it requires many steps and can be easily implemented. In addition, the processing system for realizing this requires many devices and cannot be said to be implemented at low cost. Some factories and plants have a desire to reduce the amount of drainage containing oil at low cost and in a simple manner even if the oil cannot be completely removed.

  Moreover, about the treatment of the drain containing the oil discharged from the air compressor, there is a problem of how to efficiently recover the drain discharged from the air compressor in addition to the removal of the oil. The drain discharged from the air compressor is discharged with a part of the compressed air, so the discharge speed is high, and the compressed air also expands instantaneously, so how to separate air and drain easily and efficiently. Is the point. If separation of compressed air and drain is not performed successfully, drain or mist containing oil will be released to the atmosphere. As described above, various methods for removing oil from the recovered drain have been studied. However, methods for easily and efficiently recovering the drain discharged from the air compressor have been sufficiently studied. I can't say that.

  An object of the present invention is to provide a drain recovery processing apparatus that can easily and efficiently recover drain from a drain partially containing compressed air.

The present invention is a drain recovery processing device for recovering and processing drain containing compressed air in a part discharged from an air compressor,
A vertically long box having an open top and a drain outlet at the bottom;
A filter attached to cover the top of the box;
A drain introduction port for introducing a drain containing compressed air into a part provided on a side surface of the box;
A drain collision rod that is near the drain introduction port and collides with a drain that is attached to the box so as to be orthogonal to the drain introduction direction;
A partition plate having a small opening in the center attached to the box body and having a center inclined downward;
A collision plate attached to an upper portion of the opening that has a certain distance from the opening and causes a drain that includes compressed air to collide with a part that ascends the opening;
A drain treatment tank that is located outside the box and receives and condenses the drain discharged from the box;
Heating means attached to the drain treatment tank for heating the drain,
The flow path formed in the box has a pressure loss when gas is introduced from the drain inlet and the gas is circulated through the box more than the gas is circulated to the drain outlet. The drain recovery processing device is characterized in that it is formed so that the direction in which gas is circulated is small.

In the present invention, the partition plate is attached in a plurality of stages in the vertical direction in the box,
The collision plate is attached to the upper part of the opening of each partition plate,
The box body further includes an inclined plate that is positioned below the partition plate in the box body and guides the drain to the drain discharge port.

  In the present invention, the drain introduction port is provided with a plurality of drain introduction ports substantially horizontally, and the drain collision rod is provided on the same plane as the plurality of drain introduction ports.

  The drain recovery processing device of the present invention is a drain recovery processing device for recovering and processing drain containing compressed air in part discharged from an air compressor, having a drain inlet on a side surface, Collision rod, partition plate having a small opening at the center attached to the inside of the box, and a center inclined downward, a drain having a certain distance from the opening and containing compressed air in a part rising the opening And the collision plate attached to the upper part of the opening for causing the collision of the compressed air, the introduced compressed air and the drain can be separated easily and efficiently. Since the flow path through which the compressed air in the box passes is enlarged or reduced, the pressure of the introduced compressed air can be efficiently reduced. Moreover, since the filter is provided in the upper part of the box, it is possible to prevent the drain droplet or mist from being scattered in the atmosphere. In addition, the pressure loss when gas was introduced from the drain introduction port and the gas was circulated through the box was introduced because the gas circulated on the filter side was smaller than the gas circulated on the drain discharge side. Most of the compressed air is discharged from the top of the box. As a result, even if the drain outlet is always open, the drain can be guided to the drain treatment tank without being scattered. Moreover, since the drain treatment tank is provided with a heating means, the oil contained in the drain can be concentrated and recovered.

  Further, according to the present invention, the partition plates are attached in a plurality of stages in the vertical direction in the box body, and the collision plates are attached to the upper portions of the openings of the partition plates. However, the drain can be efficiently recovered without clogging the filter with the drain and without greatly increasing the pressure in the box. Further, since the box is provided with an inclined plate that is positioned below the partition plate in the box and guides the drain to the drain discharge port, the drain can be efficiently collected and guided to the drain treatment tank.

  Further, according to the present invention, the drain introduction port includes a plurality of drain introduction ports provided substantially horizontally, and the drain collision rod is provided on the same plane as the plurality of drain introduction ports. It is possible to efficiently recover the drain that is discharged. Since the drain discharged from the air compressor is discharged intermittently, the drain discharged from a plurality of air compressors is processed by a device having a size capable of processing the drain of one air compressor. It is possible and efficient.

  FIG. 1 is an external view of a drain recovery processing apparatus 1 as an embodiment of the present invention. FIG. 2 is a view as seen from the section line II-II shown in FIG. FIG. 3 is a perspective view of the collision plate 29a of the drain recovery processing apparatus 1 shown in FIG. The thick line shown in FIG. 2 shows the flow of compressed air and drain. The drain recovery processing device 1 is a device for recovering and processing drain partially containing compressed air discharged from an air compressor (not shown). The drain recovery processing device 1 recovers and collects the drain. And a processing unit 3 for concentrating the drain. The recovery unit 2 receives the drain partially containing the compressed air discharged from the air compressor, separates the compressed air and the drain, collects the drain, reduces the pressure, and releases the compressed air to the atmosphere.

  The recovery unit 2 has a vertically long box 11 having a square cross-sectional shape, and introduces a drain partially containing compressed air discharged from two air compressors (not shown) on the side of the box 11. The drain inlet 13 (13a, 13b) is provided. A drain introduction pipe 15 (15a, 15b) communicating with a drain trap (not shown) of the air compressor is connected to the drain introduction port 13 to receive the drain. This drain contains water as well as oil, and most of this oil is emulsified. In the present embodiment, two drain introduction pipes 15a and 15b are attached in order to process drains respectively discharged from the two air compressors. The shape of the box 11 is not limited to a square cross-sectional shape, and may be a rectangle or a circle.

  The box body 11 has an upper portion 17 opened, and a filter 19 is attached to cover the opening. The filter 19 is detachably attached to a lower portion of a lid 21 attached to the upper portion of the box 11 via a hinge 20 so as to be opened and closed, and the filter 19 can be easily removed by opening the lid 21. Since the lid 21 is attached so as to have a certain distance from the upper portion of the box 11, the compressed air that has passed through the filter 19 is discharged from between the box 11 and the lid 21 to the outside. The filter 19 is for removing the drain droplet or mist generated when the drain containing the compressed air in part is received in the box body 11, and the droplet or mist contains oil in addition to moisture. Therefore, it is necessary to be made of an oil resistant material. Further, the box 11 has a reverse cone 23 at the bottom, and a drain discharge port 24 for discharging drain is provided at the center of the reverse cone 23. A pipe 26 having a valve 25 is attached to the drain discharge port 24, and the drain is guided to the processing unit 3.

  Further, inside the box 11, a rod-shaped collision rod 28, a collision plate 29 (29 a, 29 b) having a mountain shape when viewed from the front, and a cross section for collecting a drain by forming a compressed air flow path are V. A partition plate 32 (32a, 32b) having a small opening 31 (31a, 31b) in the center and an inclined plate 34 (34a, 34b) for guiding the donlet to the drain outlet 24 is provided. The rod-shaped collision rod 28 has a circular cross-sectional shape and is attached to the box 11 substantially horizontally, and its attachment position is in the vicinity of the drain inlet 13 and orthogonal to the flow direction of the supplied drain. It is attached to. The partition plate 32 is attached in two stages in the vertical direction at a position higher than the collision rod 28. The partition plate 32 has a V-shaped cross section and is attached so as to cover the transverse section of the box 11. For this reason, the compressed air and drain supplied to the box 11 use the opening 31 provided in the central part of the partition plate 32 as a flow path.

  A mountain-shaped collision plate 29 (29a, 29b) is mounted on the opening 31 of the partition plate 32 at a certain distance from the opening 31. The mountain-shaped collision plate 29 is fixed by attaching support rods (not shown) to the four corners and attaching them to the partition plate 32. Two inclined plates 34 are attached to a lower position by the collision rod 28 so as to be opposed to each other by changing the attachment height. Since the tip of the inclined plate 34 protrudes from the longitudinal center line of the box 11, a small flow path is formed at the tip of the two inclined plates 34 a and 34 b. The partition plate 32, the opening 31 of the partition plate 32, the collision plate 29 attached to the upper portion of the opening 31, and the resistance of the flow path from the drain inlet 13 formed by the filter 19 to the passage of the filter 19; The latter is greater in terms of the resistance of the flow path from the drain inlet 13 formed by the inclined plate 34, the drain outlet 24, and the pipe 26 having the valve 25 attached to the drain outlet 24 to the outlet of the pipe 26. Thus, a flow path is formed. For this reason, when drain containing a part of compressed air from the drain inlet 13 is introduced into the box 11, most of the introduced compressed air is discharged from the box upper part 17.

  The processing unit 3 mainly includes a processing tank 40 that receives and concentrates the drain collected by the recovery unit 2, a heater 42 attached to the outer wall 41 of the processing tank 40, and a temperature detector 44 that detects the temperature of the heater 42. Is done. The processing tank 40 is a cylindrical container having a bottom plate 46 opened at the top, and includes a concentrate recovery nozzle 48 to which a valve 47 for discharging the concentrated drain is attached at the center of the bottom plate 46. In addition, an overflow nozzle 50 is provided for collecting the drain when the amount of drain received is large. A heater 42 for heating the drain is attached to the lower part of the treatment tank 40. Since the heater 42 plays a role of heating the drain in the treatment tank 40 and evaporating the water constituting the drain, it is desirable to have at least the ability to heat the drain to 100 ° C. or more, and a band heater is preferably used. can do. Since the heater 42 may be accidentally drained, it is desirable that the heater 42 be waterproof and oil resistant.

  A temperature detector 44 is attached to a portion where the heater 42 and the outer wall 41 of the processing tank 40 are in contact with each other, and the temperature of the heater 42 is kept constant in cooperation with a temperature controller (not shown) provided in the control panel 52. To control. A heat insulating material 53 is attached so as to cover the outer wall 41 and the heater 42 of the processing tank 40. Further, a level meter 54 for detecting the liquid level in the processing tank 40 is attached to the upper part of the processing tank 40. This level meter 54 is connected to an alarm device (not shown), and issues an alarm when the drain level in the processing tank 40 exceeds a predetermined height. It is well known that the temperature detector 44 and the temperature controller (not shown) are not necessarily required when a self-temperature control type heater or slider is provided. Further, the level 54 meter is not always necessary when the drain amount is known in advance. The box 11 is supported and fixed by the support frame 5, and the processing tank 40 is placed on the base 6 provided below the box 11 and below the support frame 5.

  In the drain recovery processing apparatus 1 configured as described above, a drain including a part of compressed air from an air compressor (not shown) is connected to the box 11 from the drain inlets 13a and 13b via the drain inlet pipes 15a and 15b. When the gas is supplied to the drain, the drain partially containing the compressed air collides with the rod-shaped body 28 due to inertial force, and rapidly expands in the box 11 to reduce the pressure. Most of the drainage and the compressed air that collide with the rod-like body 28 and partly separated from the drainage rise through the opening 31a formed in the partition plate 32a. This is because the pressure loss below the rod-shaped body 28 is larger than the pressure loss above the rod-shaped body 28.

  Since a mountain-shaped collision plate 29a is attached to the upper portion of the opening 31a formed in the partition plate 32a, the flow path bends at a substantially right angle at this portion. For this reason, the compressed air rising through the opening 31a greatly changes the flow direction while colliding with the collision plate 29a. The droplets and mist of the drain that rises with the compressed air as the opening portion has a large inertial force and collide with the collision plate 29a as it is. For this reason, a part of the drain is separated from the compressed air here. Furthermore, since the compressed air that has passed through the flow path formed by the partition plate 31a and the mountain-shaped collision plate 29a enters a large flow path formed by the two partition plates 32a and 32b, the pressure and speed are drastically reduced. Let As a result, the liquid enemies and mist of the drain accompanying the compressed air are separated from the compressed air. Similarly, when passing through the second partition plate 32b, the flow velocity of the compressed air becomes extremely fast and collides with the collision plate 29b in a high speed state. As a result, almost no drain is contained in the compressed air. A small amount of mist is collected from the filter 19 and the air from which the mist has been removed is discharged from the upper portion of the box 11.

  On the other hand, the drain separated from the compressed air flows down the partition plates 32a and 32b and falls onto the inclined plates 34a and 34b together with some of the drains that collide with the rod-shaped body 28 and reduce the speed. The drain collected on the inclined plates 34 a and 34 b is further guided to the drain tank 24 through the pipe 26 attached to the drain outlet 24. Since the upper part of the processing tank 40 is opened and is heated by the heater 42, the drain led to the processing tank 40 evaporates water and reduces the amount. The concentrated drain is taken out from the concentrate recovery nozzle 48 and treated as industrial waste.

  As described above, the drain recovery processing apparatus 1 according to the present embodiment includes the collision rod 28 and the plurality of collision plates 29a and 29b, and the flow of compressed air using the partition plates 32a and 32b and the collision plates 29a and 29b. Since the path is enlarged / reduced, the drain can be efficiently separated from the supplied compressed air due to the collision and the rapid flow velocity change. At the same time, the pressure can be reduced efficiently. Since the filter 19 is provided in the upper part of the box 11, it can prevent that drain mist is scattered in air | atmosphere. Further, since the inclined plate 34 that guides the drain to the drain discharge port 24 is provided, the drain can be efficiently recovered and guided to the drain treatment tank 40.

  Since the drain introduced from the air compressor partially includes compressed air, unless the flow path in the box is appropriately designed, the compressed air is also ejected from the drain outlet 24 together with the drain. Since the compressed air expands in the box and becomes high speed, when the compressed air is ejected from the drain discharge port 24 together with the drain, the drain is scattered around. In order to prevent this, it is only necessary to open the drain discharge port 24 and discharge the drain during a time period when the drain is not discharged from the air compressor. However, a control device or the like is required, which increases costs. On the other hand, in the present invention, the latter of the resistance of the flow path from the drain introduction port 13 through the filter 19 and the resistance of the flow passage from the drain introduction port 13 to the outlet of the pipe 26 including the valve 25 is the latter. Since the opening area of the flow path is formed so as to increase, most of the compressed air introduced from the drain inlet 13 is discharged from the box upper portion 17. Thereby, even if the drain outlet 24 is always open, the drain can be guided to the drain treatment tank 40 without being scattered.

  Inertia dust collection as shown in this embodiment is also used for the mist separator used to remove mist contained in the airflow. However, the mist separator using the commonly used inertia dust collection and this implementation The concept is greatly different from that of the recovery unit 2 of the drain recovery processing apparatus 1 shown in the embodiment. Since a mist separator using inertia dust collection that is generally used is often used in a distribution system, pressure loss becomes a problem. However, the drain partially containing the compressed air discharged from the air compressor has a high pressure and is discharged intermittently rather than continuously. For this reason, in efficiently separating and recovering drain from compressed air, it is important to effectively reduce the pressure. In this respect, the method of rapidly changing the direction of the flow path and enlarging / reducing the flow path is effective in making the apparatus compact.

  Further, by providing a plurality of drain inlets 13a and 13b as in the present embodiment, it becomes possible to efficiently recover the drain discharged from a plurality of air compressors. Since the drain discharged from the air compressor is discharged intermittently, the drain discharged from a plurality of air compressors is processed by a device having a size capable of processing the drain of one air compressor. It is possible and efficient. At this time, the plurality of drain introduction ports 13a and 13b are provided horizontally, and the collision rod 28 and the plurality of drain introduction ports 13a and 13b are provided on the same plane, so that all the introduced drains collide with the collision rod 28. Therefore, drain separation can be performed effectively.

  In the present embodiment, an example in which two partition plates 32, two collision plates 29, and two inclined plates 34 are provided has been described, but it goes without saying that the number of partition plates 32 is not limited to this. What is necessary is just to change suitably with the quantity of drainage, frequency, etc. which are discharged | emitted from an air compressor. When the drain introduction amount is large, the load on the filter 19 can be reduced by increasing the number of the partition plates 32 and the collision plates 29 installed. Accordingly, the drain can be efficiently recovered without clogging the filter 19 with the drain and without greatly increasing the pressure in the box body 11. Also, the number of drain inlets is not limited to two, and three or more drain inlets may be provided according to the amount and frequency of drain discharged from the air compressor. Furthermore, the cross-sectional shape of the collision rod 28 is not limited to a circle, and may be a triangle or a square. Although the collision rod 28 may be a plate-like body, it is preferable from the viewpoint of keeping the pressure resistance of the box 11 low that the resistance is large and the pressure in the box near the drain introduction port 13 does not become extremely high.

It is an external view of the drain collection | recovery processing apparatus 1 as one Embodiment of this invention. It is the figure seen from cut surface line II-II shown in FIG. It is the perspective view which looked at the collision board 29a of the drain collection | recovery processing apparatus 1 shown in FIG. 1 from diagonally upward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain collection processing apparatus 11 Box 13 Drain inlet 17 Upper part of box 19 Filter 24 Drain discharge port 28 Colliding rod 29 Colliding plate 31 Partition plate opening 32 Partition plate 34 Inclined plate 40 Drain processing tank 42 Heater

Claims (3)

A drain recovery processing device for recovering and processing drain containing compressed air in a part discharged from an air compressor,
A vertically long box having an open top and a drain outlet at the bottom;
A filter attached to cover the top of the box;
A drain introduction port for introducing a drain containing compressed air into a part provided on a side surface of the box;
A drain collision rod that is near the drain introduction port and collides with a drain that is attached to the box so as to be orthogonal to the drain introduction direction;
A partition plate having a small opening in the center attached to the box body and having a center inclined downward;
A collision plate attached to an upper portion of the opening that has a certain distance from the opening and causes a drain that includes compressed air to collide with a part that ascends the opening;
A drain treatment tank that is located outside the box and receives and condenses the drain discharged from the box;
Heating means attached to the drain treatment tank for heating the drain,
The flow path formed in the box has a pressure loss when gas is introduced from the drain inlet and the gas is circulated through the box more than the gas is circulated to the drain outlet. A drain recovery processing device, characterized in that it is formed so that the direction in which a gas is circulated is small. The partition plate is attached in a plurality of stages in the vertical direction in the box,
The collision plate is attached to the upper part of the opening of each partition plate,
The drain recovery processing apparatus according to claim 1, wherein the box further includes an inclined plate that is positioned below the partition plate in the box and guides the drain to the drain discharge port. The drain according to claim 1 or 2, wherein the drain introduction port includes a plurality of drain introduction ports provided substantially horizontally, and the drain collision rod is provided on the same plane as the plurality of drain introduction ports. Collection processing device.

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