JP6418201B2 - Intermittent flow generation nozzle and oil / water separation equipment - Google Patents

Description

  The present invention relates to an intermittent flow generation nozzle capable of easily generating an intermittent flow at low cost, and an oil-water separation facility including the intermittent flow generation nozzle.

  In large-scale factories such as steelworks, wastewater generated in the factory should be discharged to the outside of the factory after chemical and physical treatment is performed at the water treatment facility to achieve water quality that meets the wastewater standards. Has been done.

  In particular, as an example of a water treatment facility, an oil / water separation facility is known in which oil contained in wastewater is separated from water to obtain purified treated water. In oil-water separation equipment, flocculant is added to wastewater containing oil to form flocs containing oil, and fine bubbles are generated in the wastewater, so that the flocs float up near the water surface to separate oil and water. Do. After floating the flock, there is known a method of separating oil and treated water by a weir provided in the water tank of the oil / water separator. In this method, the height of the weir in the water tank is adjusted appropriately. It is difficult to respond flexibly to fluctuations in the amount of oil in the wastewater. On the other hand, if the height of the weir is set to a height that has sufficient margin for normal oil content fluctuations, that is, a position lower than the interface between the treated water and floc, the separation accuracy between the oil and treated water There is a problem that falls.

  Therefore, in the oil / water separation facility, when the floc floating on the water surface by the weir cannot be sufficiently separated from the treated water, the oil / water separation may be performed using a scraper. Specifically, the accuracy of oil-water separation can be ensured by scraping the floc using a scraper made of metal or hard rubber and moving the floc to the discharge tank.

JP 2005-262067 A

  In equipment using a scraper, various problems are caused by the adhesion of oil to the scraper while the equipment is in operation. Specifically, it is mentioned that the scraping ability of the floc by the scraper is lowered and the oil / water separation accuracy is lowered. As a more serious problem, the oil adhering to the scraper falls into the discharge tank as a large lump (oil lump), which causes oil accumulation in the discharge tank and discharge to discharge flocked water from the discharge tank. Blockage may occur in the tube. In the worst case, the water level of the discharge tank rises due to the blockage of the discharge pipe, and the operation of the facility may have to be stopped.

  In order to solve these problems, conventionally, the work of cleaning the oil accumulated in the drainage tanks and drain pipes is periodically performed manually. However, these operations require a person to stand on the top of a huge drainage tank, which is dangerous and burdens the worker. Therefore, reduction and eradication of cleaning operations have been eagerly desired. In order to reduce the cleaning work, in order to prevent oil adhering to the scraper from lumping and falling into the drainage tank, wash water is periodically sprayed on the scraper, and the adhering oil is separated into fine particles. The method of flushing in the state is being studied.

  However, simply spraying cleaning water on the scraper has the problem that in reality it is difficult to completely remove the oil adhering to the scraper and completely solve the problem of oil accumulation in the drainage tank and drain pipe. .

  Specifically, as a means for improving the cleaning ability of the scraper, it is conceivable to increase the pressure of water sprayed on the scraper. However, simply increasing the water pressure of the wash water will cause a large oil mass to fall out of the scraper during cleaning, so the problem of blockage of the oil mass in the drain can still occur. In addition, the scraper can be washed with high-pressure water only for a short time when the lower end of the scraper is exposed from the surface of the water. However, in the method using high-pressure water, it is not possible to completely remove the oil within such a short time. It was difficult to find a problem that the oil remained in the scraper.

  In general, it is known that the cleaning effect is improved by periodically changing the pressure of the fluid when the fluid is ejected to clean the object. Patent Document 1 is cited as a document that discloses a technique for injecting water while changing the pressure, although the object to be cleaned is not a scraper. In Patent Document 1, a high-pressure and high-speed jet can be intermittently obtained by mixing air into a fluid and temporarily accumulating it, and then releasing the fluid.

  However, if the fluid ejection device proposed in Patent Document 1 is applied to scraper cleaning of a water treatment facility in a large-scale factory such as a steel mill, a large amount of pressure accumulation gas is required, and the running cost is enormous. It becomes. In addition, when a new gas storage facility is installed, a vast installation site must be secured. In addition, when applying the technique proposed in Patent Document 1, it is necessary to newly provide a complicated control mechanism for controlling the on-off valve, which is costly and complicates equipment. There is also a problem. For these reasons, it is practically difficult to apply the fluid ejection device proposed in Patent Document 1 to water treatment facilities in factories such as steelworks.

  The present invention provides an intermittent flow generating nozzle that can easily generate an intermittent flow at low cost without requiring the installation of a large-scale and complicated facility, and an oil-water separation facility provided with the intermittent flow generation nozzle. This is the issue.

Means of the present invention are as follows.
[1] A nozzle body for ejecting fluid, a spring plate having one end fixed to the nozzle body and extending in the fluid ejection direction, and a collision provided at the other end of the spring plate and facing the nozzle opening And a spring plate that vibrates in the plate thickness direction of the spring plate with its one end as a fulcrum due to pressure when the fluid ejected from the nozzle body collides with the shield plate Intermittent flow generating nozzle.
[2] The intermittent flow generating nozzle according to [1], wherein the spring plate or the shielding plate is provided with a weight member capable of adjusting a position in the ejection direction.
[3] The intermittent flow generation nozzle according to [1] or [2], wherein the shielding plate is capable of adjusting a position in an ejection direction.
[4] The intermittent flow generation according to any one of [1] to [3], wherein a roof portion that prevents the fluid colliding with the collision portion from scattering upward is provided at an upper portion of the collision portion. nozzle.
[5] Either one of [1] to [4] is provided with a side cover for preventing the fluid colliding with the collision part from scattering to the side at both ends in the width direction of the collision part. The intermittent flow generation nozzle described.
[6] The intermittent flow generation nozzle according to any one of [1] to [5], wherein the nozzle body is a two-fluid mixing nozzle that mixes and discharges two fluids.
[7] The intermittent flow generation nozzle according to [6], wherein the two fluids are water and water vapor.
[8] The intermittent flow generation nozzle according to any one of [1] to [7], wherein an opening is provided in at least a part of the collision portion in the shielding plate.
[9] A pressurized levitation tank that floats oil in the wastewater, a scraper that scrapes off the oil that has floated in the pressurized levitation tank, a drain tank that discharges the oil scraped by the scraper, and the pressurized levitation A separation slope located between the tank and the drainage tank, the lower end of the scraper exposed from the water surface, and the intermittent flow generation nozzle according to any one of [1] to [8], The intermittent flow generation nozzle is an oil / water separation facility that injects a fluid onto a scraper located at an upper portion of the separation slope.

  According to the present invention, an intermittent flow can be generated easily and at low cost.

FIG. 1 is an explanatory view showing an example of an intermittent flow generating nozzle according to the present invention, in which (a) is a plan view and (b) is a front view. FIG. 2 is a side view of the intermittent flow generating nozzle shown in FIG. FIG. 3 is an explanatory view showing another example of the intermittent flow generating nozzle according to the present invention, in which (a) is a plan view and (b) is a front view. 4 is a side view of the intermittent flow generating nozzle shown in FIG. (A) is a flowchart which shows an example of the oil-water separation equipment provided with the scraper, (b) is the schematic diagram which looked at the oil-water separation equipment from the exit side. FIG. 6 is an explanatory diagram showing the dynamics of the scraper when cleaning the scraper. FIG. 7 is a graph showing the effect of the present invention.

  First, the intermittent flow generation nozzle according to the present invention will be described with reference to FIG.

  Fig.1 (a) is a top view of an intermittent flow generation | occurrence | production nozzle, FIG.1 (b) is a front view. As shown in FIG. 1A, the intermittent flow generation nozzle 1 includes a nozzle body 11 and an intermittent flow generation member 21.

  The nozzle body 11 has a function of ejecting fluid from the nozzle opening. In the nozzle body 11 shown in FIG. 1A, a two-fluid nozzle is used in which two fluids are supplied from the first inflow path 12 and the second inflow path 13 and these mixed fluids are ejected. In addition, as the nozzle body 11, a one-fluid nozzle can be used, but a two-fluid nozzle is preferably used from the viewpoint of ensuring a sufficient ejection pressure. Although details will be described later, the temperature of the fluid to be ejected can be adjusted by ejecting the fluid after mixing two fluids having different temperatures by using a two-fluid nozzle.

  The fluid is ejected from the nozzle body 11 with a predetermined spread in the vertical direction and the horizontal direction. Further, in the following description, an example in which the fluid ejected from the nozzle body 11 is a liquid will be described. However, gas can be ejected from the nozzle body 11.

  The intermittent flow generating member 21 is connected to the tip of the nozzle body 11 in the ejection direction (the direction from left to right in FIG. 1A), and is ejected by the ejection pressure of the fluid ejected from the nozzle body 11. It has the function of blocking the fluid or passing it forward. The intermittent flow generating member 21 is connected to the distal end portion of the nozzle body 11 and extends in the fluid ejection direction, and the flow of the fluid ejected from the nozzle body 11 provided at the distal end portion of the spring plate 22. And a shielding plate 23 for shielding. In addition, a fixing member 24 for fixing the spring plate 22 to the nozzle body 11, a fixing bolt 25 for fixing the shielding plate 23 to the spring plate 22, and the like may be provided.

  The spring plate 22 is a plate-like member that is elongated along the fluid ejection direction. The spring plate 22 is fixed to the nozzle body 11 via a fixing member 24 at one end thereof (the rear end portion in the fluid ejection direction), and the shielding plate 23 is provided at the other end portion (the front end portion in the fluid ejection direction). It is done. As an example of the fixing member 24, a combination of a U bolt, a nut, and a gantry can be cited.

  A shield plate 23 is provided at the other end of the spring plate 22. As shown in FIGS. 1 (a) and 1 (b), the shielding plate 23 includes a connecting portion 23a extending in the ejection direction and a collision portion where the fluid that extends in the vertical direction and actually ejects collides. 23b. The shielding plate 23 is fixed to the other end portion of the spring plate 22 by a fixing bolt 25 penetrating the spring plate 22 and the connection portion 23a.

  The collision portion 23b has a predetermined width (left and right direction in FIG. 1B) and height (up and down direction in FIG. 1B) so as to receive fluid ejected from the nozzle body 11 with a predetermined spread. It is formed.

  Further, as shown in FIG. 1 (a), a plurality of bolt holes 22a (five rows in the example shown in the figure) are provided in the upper part of the spring plate 22 in the fluid ejection direction. By appropriately selecting whether or not to use, the distance between the shielding plate 23 (particularly the collision portion 23b) and the nozzle body 11 can be adjusted as appropriate.

  The intermittent flow generating nozzle 1 according to the present invention may be provided with an adjustment weight 26. The adjustment weight 26 includes a weight member 26a having a predetermined weight, and a shaft-like member 26b that can change the position of the weight member 26a in the ejection direction. The shaft-like member 26b is provided along the ejection direction. For example, by forming a male screw on the shaft member 26b and forming a female screw inside the weight member 26a, the position of the weight member 26a can be adjusted by screwing.

  In the example of FIGS. 1 and 2, the adjustment weight 26 is provided on a part of the shielding plate 23, but the adjustment weight 26 may be provided on a part of the spring plate 22.

  Next, the operation of the intermittent flow generating nozzle 1 will be described with reference to FIGS. 2 (a) and 2 (b). As shown in FIG. 2A, when fluid is ejected from the nozzle body 11, the ejected fluid collides with the collision portion 23b of the shielding plate. Due to the impact at this time, the spring plate 22 is deformed so as to bend using the other end fixed by the fixing member 24 as a fulcrum. The mode after the deformation is shown in FIG. In this aspect, the fluid ejected from the nozzle body 11 is ejected forward without being blocked by the collision portion 23b. Eventually, when the deformed spring plate 22 returns to its original state due to the reaction force caused by the bending, the state shown in FIG. 2A is obtained again, and the collision portion 23b prevents the fluid from proceeding. In this way, the mode of FIG. 2A and the mode of FIG. 2B are repeated, and the spring plate 22 vibrates in the plate thickness direction, that is, in the vertical direction in FIGS. 2A and 2B. The state where the ejection of the fluid is blocked by the collision portion 23b of the shielding plate (the shielding state) and the state where the fluid is not blocked (the injection state) are repeated, and an intermittent flow can be generated.

  In the intermittent flow generation nozzle 1, the frequency of the spring plate 22 and the frequency of the intermittent flow can be adjusted by adjusting the positions of the shielding plate 23 and the adjustment weight 26. Specifically, the larger the distance between the nozzle opening 11a of the nozzle body 11 and the collision portion 23b of the shielding plate 23, the larger the amplitude and the lower the frequency. Further, the moment can be changed by adjusting the position of the weight in the adjustment weight 26. Specifically, the closer the position of the weight member 26a is to the nozzle body 11, the smaller the amplitude and the higher the frequency. Therefore, when the frequency of the spring plate 22 is to be increased, at least one of the shielding plate 23 and the weight member 26a may be brought close to the nozzle body 11, and when the frequency of the spring plate 22 is to be decreased, the shielding plate is used. It suffices that at least one of 23 and the weight member 26a is kept away from the nozzle body 11. When adjusting the frequency, the amplitude may change, but it is preferable not to make the amplitude too small. Specifically, it is preferable to ensure the magnitude of the amplitude so that the ejected fluid is not completely blocked by the collision portion 23b of the shielding plate 23 when the bending of the spring plate 22 is maximized.

  In addition, the frequency can be changed by changing the material of the spring plate 22. When water is ejected from the nozzle body 11, it is preferable to use a stainless steel material for the spring plate 22 that can secure sufficient strength and is excellent in rust prevention.

  The position of the shield plate 23 can be adjusted by changing the bolt hole 22a into which the fixing bolt 25 is inserted, or by changing the connection position of the spring plate 22 connected to the tip of the nozzle body 11. is there.

  In the example of FIGS. 1 and 2, the spring plate 22 is provided on the upper portion of the nozzle body 11. However, as long as the spring plate is deflected or returned by the jet pressure of the fluid, the mounting position of the spring plate 22 is this example. It is not limited to. For example, the spring plate 22 can be provided in the lower part of the nozzle body 11 or can be provided in the side part. When the spring plate is provided on the side portion, the spring plate 22 vibrates in the plate thickness direction of the spring plate 22, that is, in the left-right direction. However, from the viewpoint that the vibration frequency of the spring plate 22 can be easily adjusted by adjusting the positions of the shielding plate 23 and the weight member 26a, the spring plate 22 is preferably provided on the upper portion of the nozzle body 11.

  In the example of FIG. 1A, the connecting portion 23a of the shielding plate 23 is wider than the spring plate 22 and is widened in the width direction. Such a connection part 23a fulfill | performs the function of the roof part which prevents the fluid which collided with the collision part 23b from scattering to upper part. Thereby, it is possible to prevent the fluid after colliding with the colliding portion 23b from being scattered to the upper portion, and it becomes easy to transmit the ejection pressure to the spring plate 22. The width direction length of the roof part should just be a magnitude | size which can cover the breadth of the fluid ejected from the nozzle main body 11. FIG.

  The roof for preventing the fluid from splashing upward may be formed in a part of the shielding plate 23a as shown in FIG. 1A, or formed in a part of the spring plate 22 although not shown. May be.

  3 and 4, another aspect of the intermittent flow generation nozzle will be described.

  As shown to Fig.3 (a), the intermittent flow generation nozzle 1 is provided with the side cover 23c. The side cover 23 c can prevent the fluid collided at the collision portion 23 b of the shielding plate 23 from diffusing to the side, and the ejection pressure can be easily transmitted to the spring plate 22.

  As shown to Fig.3 (a), the side cover 23c can prevent the spreading | diffusion of a fluid more effectively by providing so that it may make an obtuse angle with respect to the inner surface of the collision part 23b. The height of the side cover 23c may be approximately the same as the height of the collision portion 23b.

  As shown in FIG. 3B, the intermittent flow generation nozzle 1 may be provided with an opening 23d in the collision portion 23b. In the opening 23d, the fluid can radiate forward without being shielded. By providing the opening 23d, the frequency of radiation and shielding of the fluid can be increased, and the frequency of the spring plate 22 can be increased. Details of the mechanism will be specifically described below.

  As shown in FIG. 4 (a), when the intermittent flow generating nozzle 1 is viewed from the side, the collision part 23b of the shielding plate 23 is divided into an upper collision part 23e and a lower collision part 23f across the opening 23d. Divided. In FIG. 4A, the shielding plate 23 covered with the side cover 23c is illustrated for convenience. In the initial state shown in FIG. 4A, the fluid ejected from the nozzle body 11 is ejected forward through the opening 23d, and during this time, the upper collision part 23e, the lower collision part 23f, or the side Since the fluid hits the inner side of the side cover 23c and the ejection pressure is transmitted to the shielding plate 23, the spring plate 22 bends upward. As shown in FIG. 4B, since the lower collision portion 23f blocks the fluid at the beginning of the bending, the fluid is temporarily not ejected forward of the shielding plate 23. Next, when the bending of the spring plate 22 further proceeds, as shown in FIG. 4C, the shielding plate 23 does not block the flow of the fluid, and the fluid is jetted forward of the shielding plate 23. When the bending of the spring plate 22 returns due to the reaction force, it returns to the injection state shown in FIG. 4A through the shielding state shown in FIG. In the example of FIG. 2 in which the opening is not provided, the spring plate 22 is provided in the example of FIG. 4 in which the opening is provided in order of the shielding state-injection state-shielding state in order while the spring plate 22 vibrates once. During one vibration, the injection state (FIG. 4A) -shielding state (FIG. 4B) -injection state (FIG. 4C) -shielding state (FIG. 4B) -injection state ( FIG. 4A can be taken in order, and the injection-shielding cycle in the intermittent flow can be shortened. Regarding the vibration of the spring plate 22, the spring plate 22 is bent in the plate thickness direction as shown in FIG. 4C from the horizontal state as shown in FIG. 4A. It can be regarded as one vibration until it returns to the horizontal state again as shown in FIG.

  In the example of FIG. 3B, one opening 23d is arranged in the vertical direction and two in the width direction, but the arrangement of the opening 23d is not limited to this example. The more the number of openings 23d arranged in the vertical direction is increased, the shorter the fluid ejection-blocking cycle can be made. On the other hand, since it is necessary to make the area of the collision part 23b large so that the spring plate 22 can be bent upward by receiving the jet pressure of the fluid, it is desirable to appropriately adjust the area and the number of the openings.

  In the above example, an example in which the spring plate 22 and the shielding plate 23 are configured as separate bodies has been described, but these may be configured as an integral member.

  Although the intermittent flow generation nozzle 1 according to the present invention can be suitably used as a nozzle for cleaning a scraper, it can also be used as a nozzle for cleaning members other than the scraper or as a nozzle for watering as other applications. For example, it can be used as a nozzle for water spraying for dust prevention, cooling, washing, snow removal, or defoaming.

  Next, an oil-water separation facility in which a scraper cleaning nozzle suitable for use as an intermittent flow generation nozzle according to the present invention will be described.

  FIG. 5A shows the overall flow of the oil / water separation facility 31. In the oil / water separation facility 31, first, in the coagulation tank 32, a coagulant is added to the wastewater, and the coagulation treatment is performed to coagulate the oil and form the floc 33. Fine air is blown into the waste water containing the floc 33 from the pressurized water pump 35 in the pressurized flotation tank 34, and the flock 33 floats to the vicinity of the water surface. Thereafter, the floc 33 is scraped by a large number of scrapers 36 that move in the vicinity of the water surface of the pressurized levitation tank 34, and is discharged to the drain tank 38 through the separation slope 37. On the other hand, the clean water separated from the floc 33 in the pressurized levitation tank 34 is discharged to the outside of the water tank through a discharge pipe 40 provided at the bottom of the water tank.

  Waste water including the flock 33 is discharged from the drain tank 38 through the drain pipe 39 to the outside. As shown in FIG. 5 (b), the bottom of the drainage tank 38 is provided with an inclination in a direction substantially perpendicular to the advancing direction of the scraper 36 so that water and floc 33 can easily flow, and a drain pipe is provided below the inclination. 39 is provided.

  When the oil / water separation facility 31 is operated for a long period of time, oil gradually adheres to and accumulates on the surface of the scraper 36. When the oil is accumulated, the scraper 36 cannot sufficiently scrape the flock 33, and the oil / water separation becomes insufficient. Moreover, when the oil content adhering to the scraper 36 exceeds a certain amount, the oil content becomes a large lump (oil lump) and falls into the drainage tank 38, which may cause problems such as blocking of the drainage pipe 39. In particular, when oil (heavy oil) having a large specific gravity such as tar and heavy oil is processed, the problem of oil blockage is likely to occur. This is because heavy oil has a high viscosity, so that it easily adheres to scrapers and easily collects in a lump.

  Accordingly, it is desirable to frequently wash and remove the oil adhering to the scraper 36 so that a large oil mass does not fall into the drainage tank 38. Specifically, the intermittent flow generation nozzle 1 is used as a scraper cleaning nozzle and is provided in the oil / water separation facility 31 to inject cleaning water toward the scraper 36 located on the separation slope 37. Specifically, as shown in FIG. 5B, the intermittent flow generating nozzle 1 may be disposed on the outlet side of the drainage tank 38 and the nozzle opening may be directed in the inlet side direction. Moreover, the number of the intermittent flow generation nozzles 1 to be arranged can be appropriately adjusted so that the spray water hits the entire width direction of the scraper 36.

  When cleaning the scraper 36 in this way, it is preferable to send an intermittent flow instead of sending a constant flow from the scraper cleaning nozzle 1. FIG. 6 is a graph in which the position of the lower end portion of the scraper 36 in the ejection direction when the constant flow and the intermittent flow are applied to the scraper 36 is plotted on the vertical axis, and the time is plotted on the horizontal axis. The upper part of FIG. 6 is an example of a constant flow, and the lower part is an example of an intermittent flow. As shown in the graph, it is understood that the amplitude of the scraper 36 is smaller and the frequency is smaller in the case of constant flow than in the case of intermittent flow. By using the intermittent flow, the scraper 36 can be vibrated more finely and greatly, so that the oil removal performance is improved. Further, by finely vibrating the scraper 36, it is possible to prevent the oil from becoming a large lump and falling into the drainage tank 38, and the oil can be dropped as a fine lump. Less likely to cause problems.

  In order to facilitate the flow of the flock 33 to the drain pipe 39, in addition to forming the bottom of the drain tank 38 in a slope shape, a water repellent plate 41 is formed on the slope surface as shown in FIG. It is also effective to provide a shower nozzle (not shown) that makes the flocs slippery and generates a water flow from the upper part of the slope of the drainage tank 38 to the lower part.

  In the scraper cleaning nozzle 1, it is preferable to use a two-fluid nozzle in order to ensure a sufficient ejection pressure. In the two-fluid nozzle, it is desirable to use steam as one fluid and water as the other fluid. By using steam, the temperature of the water sprayed onto the scraper can be increased, and the kinematic viscosity of the oil adhering to the scraper 36 can be increased to facilitate the removal of the oil. On the other hand, when the ratio of the steam increases, the ejection pressure of the fluid ejected from the nozzle body 11 decreases, and the cleaning ability of the scraper 36 decreases. In this way, considering the two effects of increasing the kinematic viscosity of oil due to increasing the temperature of the fluid and decreasing the jet pressure, the ratio of water to steam is set so that sufficient scraper cleaning performance can be obtained. It is preferable to adjust.

  In addition, the chemical | medical agent, salt, etc. for removing oil may be contained in the water sprayed from the scraper washing nozzle 1.

  In addition to the intermittent flow generating nozzle 1 according to the present invention, the use of a nozzle that generates an intermittent flow by a mechanism such as opening / closing control of a solenoid valve can improve the cleaning efficiency of the scraper, but the intermittent flow generation according to the present invention The use of the nozzle 1 has the following effects.

First, sufficient cleaning ability can be obtained without modifying the equipment and increasing the nozzle ejection pressure, and the initial cost can be reduced. The same pressure and water pressure conventional cleaning water injected from the nozzle, for example, so good in 2kgf ^/ cm ² ~4kgf / cm 2 or so, exhibit sufficient cleaning capability while suppressing an increase in running cost due to the pressure be able to. Furthermore, compared to the method of generating an intermittent flow using on-off control of a solenoid valve, it is not necessary to newly install a control mechanism, etc., and the initial cost can be suppressed, and the cost required to operate and maintain the control mechanism. The running cost can be reduced because it does not cost.

  As described above, the scraper 36 can be cleaned only for a short time (for example, about 1 to 3 seconds) when the scraper is positioned on the separation slope 37. In order to sufficiently clean the scraper in such a short time, it is preferable to set the vibration frequency of the spring plate 22 to about 180 times / minute to 300 times / minute.

  Examples will be described below.

An example in which the oil / water separation facility 31 shown in FIG. 5A is operated and water is not ejected to the scraper 36 (Comparative Example 1), and a continuous flow is injected to the scraper 36 using a two-fluid nozzle (Comparative Example 2). ), And the example in which the intermittent flow is injected into the scraper 36 using the intermittent flow generation nozzle 1 shown in FIG. 1A (invention example 1), the cleaning operation of the drainage tank 38 and the drainage pipe 39 is performed per month. The number of times performed is shown in FIG. In addition, the wastewater treatment amount of the oil / water separation facility 31 was 30 ton / hr, and the amount of floc obtained was 1 m ³ / hr. The time required for the scraper 36 to make one round on the conveyor was about 3 minutes.

  As shown in FIG. 7, in Comparative Example 2 in which scraper cleaning is performed using a continuous flow compared to Comparative Example 1 in which water is not ejected to the scraper, although the number of cleanings per month is reduced, cleaning work still occurs. doing. On the other hand, in the present invention example 1 using the intermittent flow, since the oil component adhering to the scraper is finely removed, it is possible to prevent oil accumulation in the drain tank, oil blockage in the drain pipe, and the like, and cleaning per month. The number of operations was improved to zero.

1 Intermittent flow generation nozzle (scraper cleaning nozzle)
11 Nozzle body 11a Nozzle opening 12 First inflow path 13 Second inflow path 21 Intermittent flow generating member 22 Spring plate 22a Bolt hole 23 Shield plate 23a Connection portion 23b Colliding portion 23c Side cover 23d Opening portion 23e Upper colliding portion 23f Lower collision part 24 Fixing member 25 Fixing bolt 26 Adjusting weight 26a Weight member 26b Shaft-shaped member 31 Oil / water separation facility 32 Coagulation tank 33 Flock 34 Pressurization floating tank 35 Pressurized water pump 36 Scraper 37 Separation slope 38 Drainage tank 39 Drainage pipe 40 Release pipe 41 Water repellent plate

Claims (9)

A nozzle body for ejecting fluid; a spring plate having one end fixed to the nozzle body and extending in the fluid ejection direction; and a collision portion provided at the other end of the spring plate and facing the nozzle opening And a shielding plate,
An intermittent flow generating nozzle in which the spring plate vibrates in the plate thickness direction of the spring plate with its one end as a fulcrum by the pressure generated when the fluid ejected from the nozzle body collides with the shielding plate.   The intermittent flow generation nozzle according to claim 1, wherein the spring plate or the shielding plate is provided with a weight member capable of adjusting a position in an ejection direction.   The intermittent flow generation nozzle according to claim 1, wherein the shielding plate is capable of adjusting a position in an ejection direction.   The intermittent flow generation nozzle according to any one of claims 1 to 3, wherein a roof portion that prevents fluid that collides with the collision portion from scattering upward is provided at an upper portion of the collision portion.   The intermittent flow generation according to any one of claims 1 to 4, wherein a side cover for preventing the fluid colliding with the collision part from being scattered laterally is provided at both ends in the width direction of the collision part. nozzle.   The intermittent flow generation nozzle according to any one of claims 1 to 5, wherein the nozzle body is a two-fluid mixing nozzle that mixes and discharges two fluids.   The intermittent flow generation nozzle according to claim 6, wherein the two fluids are water and water vapor.   The intermittent flow generation nozzle according to any one of claims 1 to 7, wherein an opening is provided in at least a part of the collision portion of the shielding plate. A pressurized flotation tank that floats oil in the wastewater;
A scraper that scrapes off the oil that has floated in the pressurized levitation tank;
A drainage tank for discharging the oil scraped by the scraper;
A separation slope located between the pressurized levitation tank and the drainage tank, and a lower end of the scraper exposed from the water surface;
An intermittent flow generating nozzle according to any one of claims 1 to 8,
The intermittent flow generation nozzle is an oil-water separation facility that injects a fluid onto a scraper located at an upper part of the separation slope.

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