Purification equipment

Abstract

It is desirable to reduce the frequency with which users have to clean the tank. [Solution] A jet scrubber type purification device comprising a first bubble generator 61 installed outside the tank 20, the tank 20 comprising a raw water section 20A installed below the upstream exhaust flow path 30, an interceptor section 20B that collects foreign matter contained in the water from the raw water section 20A, and an adjustment section 20C that stores the water that has passed through the interceptor section 20B, the first bubble generator 61 discharging water out of the raw water section 20A, mixing in fine bubbles and returning the water to the raw water section 20A, the interceptor section 20B comprising a plurality of partitions 26 installed at a distance in the direction from the raw water section 20A towards the adjustment section 20C, and a discharge pipe 27 that discharges foreign matter on the water surface from a plurality of inlets through the inside of the pipe to the outside of the tank 20, the upstream external piping section 50 connected to a first adjusted water outlet installed in the adjustment section 20C, and sending the water mixed with fine bubbles to the upstream nozzle 31.

Description

[Technical Field]

[0001] The present invention relates to a jet scrubber type purification device that removes foreign matter from air. [Background technology]

[0002] Jet scrubbers have traditionally been used as purification devices to remove foreign matter such as oil and dust from the air exhausted from factories and other facilities.

[0003] For example, the purification device disclosed in Patent Document 1 includes a tank containing a cleaning liquid, a cylindrical upstream exhaust flow path with an axis extending vertically above the tank and connected to the tank, multiple upstream nozzles installed inside the upstream exhaust flow path that spray the cleaning liquid downward, and a jet pump that sends the cleaning liquid from the tank to the upstream nozzles. The jet pump ejects the liquid from the upstream nozzles, causing air to be blown from inside the upstream exhaust flow path into the tank. The tank uses the space above the liquid surface as an exhaust flow path. A downstream exhaust flow path is installed above the tank, next to the upstream exhaust flow path, and air flows from the tank into the upstream exhaust flow path.

[0004] In the purification device of Patent Document 1, the cleaning liquid in the tank is sent to the upstream nozzle by the upstream external piping section, and the cleaning liquid sprayed from the upstream nozzle returns to the tank through the inside of the upstream exhaust flow path, thereby circulating the cleaning liquid and purifying the air.

[0005] Conventionally, foreign matter has also been removed from air using water in a jet scrubber type purification device (Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Unexamined Patent Publication No. 48-52669 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-56486 Summary of the Invention [Problem to be solved by the invention]

[0007] When air is purified, foreign matter adheres to the tank, so the user must clean the tank. It is desirable to reduce the frequency with which the user has to clean the tank.

[0008] SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a purification device. [Means for solving the problem]

[0009] The purification device of the present invention is a jet scrubber system including a first support section extending from an installation surface, a tank supported above the installation surface by the first support section, a cylindrical upstream exhaust flow path mounted on the tank and having a vertically extending axis and an interior connected to the interior of the tank, a rectangular downstream exhaust flow path mounted on the tank and having a vertically extending axis and an interior connected to the interior of the tank and an open upper end, multiple upstream nozzles spaced apart vertically within the upstream exhaust flow path for spraying water downward, and an upstream external piping section for transporting the water from the tank to the upstream nozzles. The purification device also includes a first bubble generator mounted outside the tank. The tank includes a raw water section mounted below the upstream exhaust flow path, an interceptor section for collecting foreign matter contained in the water from the raw water section, and an adjustment section mounted below the downstream exhaust flow path for storing the water that has passed through the interceptor section. The first bubble generator discharges the water from the raw water section, mixes fine bubbles into the water, and returns the water to the raw water section. The interceptor section includes a plurality of partitions spaced apart in a direction from the raw water section toward the adjustment section, and a discharge pipe that discharges the foreign matter on the water surface from a plurality of inlets through the inside of the pipe to the outside of the tank. The upstream external piping section is connected to a first adjusted water outlet provided in the adjustment section, and sends the water mixed with the fine bubbles to the upstream nozzle.

[0010] The purification device of the present invention preferably includes a plurality of auxiliary tank nozzles above the water surface in the interceptor section, and the water containing the fine bubbles is sent to the auxiliary tank nozzles through a branch pipe branching from the first bubble generator.

[0011] The purification device of the present invention preferably includes a plurality of upstream auxiliary nozzles located higher than the upstream nozzle located at the highest position inside the upstream exhaust flow path, and when the upstream nozzle located at the highest position and the upstream auxiliary nozzles are projected onto an imaginary horizontal plane, the upstream auxiliary nozzles are located around the upstream nozzle, and the upstream auxiliary nozzles are set to have a larger spray angle than the upstream nozzles and face downward, and the water containing the fine bubbles is sent to the upstream auxiliary nozzles by a branch pipe branching off from the upstream external piping section.

[0012] The purification device of the present invention preferably includes a second bubble generator provided outside the tank, which discharges the water outside the adjustment unit and further mixes the fine bubbles into the water before returning the water to the adjustment unit. The adjustment unit may have the first conditioned water outlet provided on one of the opposing first and second side surfaces, and an conditioned water return port for the second bubble generator provided on the other of the first and second side surfaces. Furthermore, the conditioned water return port may have an elbow, and the water may be discharged from the elbow into the adjustment unit.

[0013] In the purification device of the present invention, preferably, the tank has a bottom formed from the raw water section to the adjustment section, and the partitions consist of submerged plates rising from the bottom and submerged, and protruding plates held above the bottom and with their upper ends protruding above the water surface, arranged alternately in a direction from the raw water section to the adjustment section, and the distance d1 between the upstream protruding plate and the downstream submerged plate is set wider than the distance d2 between the upstream submerged plate and the downstream protruding plate (d1>d2). Of the multiple protruding plates, it is desirable that one provided closer to the adjustment section protrudes higher than the rest.

[0014] The purification device of the present invention preferably includes a water supply pipe that supplies water to the adjustment unit and an overflow unit provided in the adjustment unit, and the upstream external piping unit includes a pump that sends water to the upstream nozzle and an interceptor that is provided upstream of the pump and is attached to the side of the tank by a second support part that rises from the installation surface. The interceptor includes a box, a liquid level sensor that measures the water level in the box for supplying water from the water supply pipe to the adjustment unit, and a screen. The box includes a box bottom, box side parts that rise from the periphery of the box bottom and are located at a position higher than the water level in the tank, and have a box inlet and a box outlet opposite the box inlet, and a box top part that is located at the upper end of the box side part and supports the liquid level sensor. The screen is formed in a plate shape and partitions the interior of the box with one side facing the box inlet and the other side facing the box outlet.

[0015] In the purification device of the present invention, the upstream exhaust flow path, the space of the tank, and the downstream exhaust flow path are preferably each set so that the downstream one has a larger cross-sectional area for ventilation than the upstream one, and furthermore, the downstream exhaust flow path is formed lower in height from the top surface of the tank than the upstream exhaust flow path. [Effects of the Invention]

[0016] The purifying device of the present invention can be used for a longer period of time than conventional purifying devices without the need for the user to clean the tank. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view of a purification device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing a water supply system, an air supply system, a power supply system, and a monitoring system that are piped outside the tank of the purification device of FIG. 1. [Figure 3] FIG. 2 is a perspective view of the tank of the purification device of FIG. 1. [Figure 4] FIG. 2 is a cross-sectional view of the tank taken along line S1-S1 in FIG. [Figure 5] 5 is a cross-sectional view of the purification device taken along line S2-S2 in FIG. 4. [Figure 6] FIG. 2 is an enlarged view of the interceptor portion of the cross section of the tank in FIG. 1. [Figure 7] FIG. 6 is a cross-sectional view of the interceptor taken along line S3-S3 in FIG. 5. [Figure 8] FIG. 6 is an exploded perspective view of the box of the interceptor of FIG. 5. [Figure 9] FIG. 10 is a diagram illustrating another example of the configuration of the purification device according to the embodiment of the present invention. [Figure 10] 10 is a diagram for explaining the positional relationship between an upstream nozzle and an upstream auxiliary nozzle in the upstream exhaust flow path in FIG. 9. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Fig. 1 is a cross-sectional view of a purification device 1 according to an embodiment of the present invention, and Fig. 2 is a diagram showing the water supply system, air supply system, power supply system, and monitoring system of the purification device 1. The purification device 1 uses water to purify the air exhausted from a factory or facility, and also purifies the water used to purify the air.

[0019] First, the structure for purifying the air will be described. The purification device 1 includes a first support part 11 that rises from an installation surface G, a tank 20 that is held above the installation surface G by this first support part 11, an upstream exhaust flow path 30 provided above the tank 20, a downstream exhaust flow path 40 that is provided above the tank 20 and spaced apart from the upstream exhaust flow path 30, a plurality of upstream nozzles 31 provided in the upstream exhaust flow path 30, a demister 43 provided in the downstream exhaust flow path 40, and an upstream external piping part 50 that sends water from the tank 20 to the upstream nozzles 31. In the drawings, the water contained in the tank 20 is hatched and denoted by the symbol W, and the water surface is denoted by the symbol W1.

[0020] The first support portion 11 is formed by welding or the like of a plurality of vertical portions 111 extending vertically and a plurality of horizontal portions 112 extending horizontally. These are made of an aluminum alloy. The vertical portions 111 rise from the ground surface G via adjusters (not shown).

[0021] (Tank 20) Fig. 3 is a perspective view of tank 20, and Fig. 4 is a cross-sectional view of tank 20 taken along line S1-S1 in Fig. 1. Tank 20 has a bottom 21, side surfaces 22 rising from the periphery of bottom 21, a top surface 23 provided at the upper end of the rectangular side surface 22, and a downstream opening 24 provided at the upper end of side surface 22 beside top surface 23.

[0022] As shown in FIG. 4, the bottom 21 has a rectangular outline in plan view. Hereinafter, the longer sides of the rectangular outline in plan view are referred to as the long edge and the shorter sides are referred to as the short edge. The bottom 21 may be flat and horizontal, or may be formed as a slope gradually descending from a third side surface 223 (described later) to a fourth side surface 224 (described later). FIG. 5 is a cross-sectional view of the purification device 1 taken along line S2-S2 in FIG. 4. The bottom 21 preferably has a valley-like shape formed by connecting two inclined bottoms 211 and 212. Furthermore, this valley-like bottom 21 also gradually descends from the third side surface 223 (described later) to the fourth side surface 224 (described later). The fourth side surface 224 is provided with a drain port (not shown) with an on-off valve for discharging water from a deep portion of the tank 20.

[0023] The side surface portion 22 includes a first side surface portion 221 and a second side surface portion 222 rising from the respective long side edges of the bottom surface 21, and a third side surface portion 223 and a fourth side surface portion 224 rising from the respective short side edges of the bottom surface.

[0024] The top surface portion 23 is rectangular in plan view, connecting the third side surface portion 223 to the third side surface portion 223 side of each of the first side surface portion 221 and the second side surface portion 222 at the upper end of the rectangle of the side surface portion 22. The top surface portion 23 is also provided with an upstream opening 23A that communicates with the interior of the upstream exhaust flow path 30.

[0025] The downstream opening 24 has a square shape in plan view, which is formed by the fourth side surface portion 224, the fourth side surface portion 224 side of each of the first side surface portion 221 and the second side surface portion 222, and the edge of the top surface portion 23. The downstream opening 24 communicates with the interior of the downstream exhaust flow path 40.

[0026] The tank 20 has an interior defined by a bottom 21, side surfaces 22, a top surface 23, and a downstream opening 24, and the interior is used to store water, with a space 25 above the water being used as an exhaust passage.

[0027] (Upstream exhaust flow path 30) The upstream exhaust flow path 30 is formed in a cylindrical shape, and one end of the upstream exhaust flow path 30 is attached to align with the upstream opening 23A of the top surface portion 23, the axis of the upstream exhaust flow path 30 extends vertically, and the interior of the upstream exhaust flow path 30 is connected to the interior of the tank 20.

[0028] A plurality of upstream nozzles 31 are provided vertically spaced apart inside the upstream exhaust flow path 30. In the illustrated example, the number of upstream nozzles 31 is four, but this is not limited to this. The jetting direction of the upstream nozzles 31 is set downward, and the jetting angle is, for example, 30 degrees. In the drawing, the water jetted from the upstream nozzles 31 is represented by a dashed triangle.

[0029] The upper end of the upstream exhaust flow path 30 is connected to the downstream end of an upstream exhaust duct 101 of, for example, a factory or facility via a joint 32. In Figure 1, the joint 32 and the upstream exhaust duct 101 are indicated by a two-dot chain line.

[0030] (Downstream exhaust flow path 40) The downstream exhaust flow path 40 is formed in a rectangular cylindrical shape. Furthermore, the lower end of the downstream exhaust flow path 40 is attached to the downstream opening 24 of the tank 20, the downstream exhaust flow path 40 has an axis extending vertically, and the interior of the downstream exhaust flow path 40 is connected to the interior of the tank 20. Specifically, as shown in FIG. 5 , the downstream exhaust flow path 40 includes a downstream first side surface portion 411 and a downstream second side surface portion 412 that are connected to the first side surface portion 221 and the second side surface portion 222 of the tank 20 and face each other, which define the lateral dimension a22 of the space portion 25, a downstream third side surface portion 413 that is connected to the edge 231 of the top surface portion 23 of the tank 20, and a downstream fourth side surface portion 414 that faces the downstream third side surface portion 413 and is connected to the fourth side surface portion 224 of the tank 20, and the downstream first side surface portion 411, the downstream second side surface portion 412, the downstream third side surface portion 413, and the downstream fourth side surface portion 414 are connected around the axis to form a cylindrical shape.

[0031] A demister 43 is provided inside the downstream exhaust flow path 40. The demister 43 can be configured by attaching a filter such as expanded metal to the inside of a frame. Multiple filters, for example, four filters, can be stacked on top of each other, or can be attached to the frame separated from each other by spacers. Note that, other than the demister 43, the downstream exhaust flow path 40 does not have any other obstructing members, such as plate-shaped ones, that obstruct the flow of air inside.

[0032] In the tank 20, air enters the tank 20 from the upstream exhaust passage 30 through the upstream opening 23A, flows through the space 25, and enters the downstream exhaust passage 40 through the downstream opening 24. To reduce the pressure loss of the air flow in the purification device 1, as shown in FIG. 1, the opening 40A at the top of the downstream exhaust passage 40 is open and not connected to the downstream exhaust duct of the factory or facility. Air flows out of the purification device 1 through this opening 40A. In FIG. 1, the downstream exhaust duct 102, hood 102A, and fan 102B are represented by two-dot chain lines, and the hood 102A of the downstream exhaust duct 102 is installed above the downstream exhaust passage 40. The air that leaves the purification device 1 through the opening 40A at the top of the downstream exhaust passage 40 is sucked in through the hood 102A by the fan 102B, such as an axial-flow fan, installed in the downstream exhaust duct and sent to an exhaust outlet installed, for example, on the roof of the factory or facility, where it is exhausted outdoors.

[0033] In the purification device 1, the upstream exhaust flow path 30, the space 25 of the tank 20, and the downstream exhaust flow path 40, which are exhaust flow paths through which air flows, are each set so that the downstream side has a larger cross-sectional area for ventilation than the upstream side. 2 >a21×a22>π(a1 / 2) 2 (This magnitude relationship may be referred to as equation (1) below.) Here, a1 is the inner diameter of upstream exhaust flow path 30, which is a cylindrical duct, a21 and a22 are the vertical dimension (FIG. 1) and horizontal dimension (FIG. 5) of space portion 25, which is a rectangular duct, as the inner dimensions, and a3 is the inner dimension of downstream exhaust flow path 40, which is a square duct (FIGS. 1 and 5). Downstream exhaust flow path 40 may be configured as a rectangular duct. Furthermore, when comparing the dimension b1 of the upstream exhaust flow path 30 and the dimension b2 of the downstream exhaust flow path 40 in terms of height from the top surface 23, the downstream exhaust flow path 40 may be set to be lower than the upstream exhaust flow path 30 (b1>b2), and the distance that air flows in the downstream exhaust flow path 40 may be set to be shorter.

[0034] (Upstream external piping section 50) The upstream external piping section 50, indicated by a thick solid line in Figure 2, is composed of pipes, joints, on-off valves, etc. connecting the tank 20 to the upstream nozzle 31. The upstream external piping section 50 is equipped with an upstream pump 51 that sends water to the upstream nozzle 31. The air purification device 1 uses a jet scrubber method, in which air is drawn from the upstream exhaust duct 101 into the upstream exhaust flow path 30 by jetting water from the upstream nozzle 31, and then sent downstream to the tank 20. The air is then discharged outside the purification device 1 through the opening 40A at the upper end of the downstream exhaust flow path 40. Note that the upstream exhaust flow path 30 does not include any plate-shaped or other obstructing members that obstruct the flow of air, other than the multiple upstream nozzles 31 and the piping members such as straight pipes and pipe joints connected to them.

[0035] In the purification device 1, as the air flows from the upper end to the lower end of the upstream exhaust flow path 30, the water from the upstream nozzle 31 mixes with foreign matter in the air, and the foreign matter is collected together with the water in the tank 20. In the purification device 1, the water is circulated from the tank 20 through the upstream external piping section 50, the upstream exhaust flow path 30, and the tank 20 in that order, and is used to purify the air.

[0036] Next, the purification of the water contained in the tank 20 will be described. As shown in Figure 2, the tank 20 has a water purification structure that consists of a raw water section 20A located below the upstream exhaust flow path 30, an interceptor section 20B that collects foreign matter in the water, and an adjustment section 20C located below the downstream exhaust flow path 40 and that stores water that has passed through the interceptor section 20B.

[0037] The raw water section 20A receives the water ejected from the upstream nozzle 31 inside the upstream exhaust flow path 30. Furthermore, the raw water section 20A is not provided with an obstructing member that blocks the movement of water from the upstream opening 23A of the tank 20 toward the liquid surface.

[0038] Figure 6 is an enlarged view of interceptor section 20B in the cross section of tank 20 in Figure 1. Interceptor section 20B includes multiple partitions 26 spaced apart in the direction from raw water section 20A toward adjustment section 20C, and a discharge pipe 27 for discharging foreign matter floating on the liquid surface to the outside of tank 20. In Figure 6, the hatching of the water is omitted, the water surface W1 is represented by a two-dot chain line, and floating matter is indicated by the symbol FL and hatched. Here, floating matter is not limited to foam or solid matter, but is also used as a term that includes liquid oil and the like.

[0039] The partitions 26 divide the interceptor section 20B into a plurality of storage compartments, and collect floating matter on the liquid surface in each storage compartment. One edge of the partitions 26 extending up and down is fixed to the first side surface section 221 via a bracket or by welding, and the other edge opposite the one edge is fixed to the second side surface section 222 via a bracket or by welding.

[0040] The arrangement and number of partitions 26 provided in the interception section 20B are not limited to those shown in the illustrated example, but preferably, the purification device 1 in the illustrated example has partitions 26 consisting of submerged plates 261 that rise from the bottom 21 and are submerged, and protruding plates 262 that are held above the bottom 21 and have their upper ends protruding from the water surface into the space section 25, arranged alternately and at a distance from each other in the order of the submerged plates 261 and the protruding plates 262 in the direction from the raw water section 20A to the adjustment section 20C.

[0041] In this case, water flows between the submerged plate 261 and the protruding plate 262 toward the adjustment section 20C. Where the submerged plate 261 is provided on the raw water section 20A side (upstream) and the protruding plate 262 is provided on the adjustment section 20C side (downstream), a downward flow path is formed between the submerged plate 261 and the protruding plate 262, through which water flows toward the bottom of the interceptor section 20B. Where the protruding plate 262 is provided on the raw water section 20A side (upstream) and the submerged plate 261 is provided on the adjustment section 20C side (downstream), an upward flow path is formed between the protruding plate 262 and the submerged plate 261, through which water flows from the bottom of the interceptor section 20B toward the liquid surface. In the interceptor section 20B, water containing foreign matter flows alternately through the downward flow path and the upward flow path, and the foreign matter collects on the water surface as floating matter. Here, it is desirable that the distance d1 between the protruding plate 262 forming the ascending flow path and the submerged plate 261 further downstream be set wider than the distance d2 between the submerged plate 261 forming the descending flow path and the protruding plate 262 further downstream (d1>d2). For example, the difference between d1 and d2 (=d1-d2) is set to 100 mm or more, with d1 being 200 mm and d2 being 100 mm.

[0042] Furthermore, in the interceptor section 20B, it is desirable that one of the multiple protruding plates 262, located closer to the adjustment section 20C, protrudes higher than the remaining ones. The dimension g1 from the water surface W1 to the top of the protruding plate 262 located closer to the adjustment section 20C is, for example, 160 mm, and the dimension g2 from the water surface W1 to the top of the protruding plate 262 located further upstream is, for example, 20 mm, with the difference in dimensions (g1 - g2) being 100 mm or more. In this case, the dimension j from the top of the protruding plate 262 located closer to the adjustment section 20C to the top surface section 23 is set to, for example, 300 mm or more. By raising the height of the most downstream protruding plate 262 in this way, floating matter can be reduced from climbing over the protruding plate 262 and transferring to the adjustment section 20C. Here, the vertical dimension a21 of the space 25 in the formula (1) is the internal dimension from the water surface to the top surface 23, and it is desirable that the formula (1) also holds when the dimension j is used instead of the vertical dimension a21.

[0043] Discharge pipe 27 has a plurality of inlets 271 for allowing floating matter to enter the inside of the pipe. The inlets 271 are formed by penetrating from the outer peripheral surface to the inner peripheral surface of discharge pipe 27. In the configuration example shown in Fig. 4, five elongated holes as inlets 271 are arranged in a row on an imaginary straight line (not shown) along the axis of discharge pipe 27, with their longitudinal directions parallel to the axis of discharge pipe 27, but the number and dimensions of the elongated holes are not limited to those shown in the example.

[0044] One end 27A of the discharge pipe 27 is attached to one of the first side surface portion 221 and the second side surface portion 222 by a bracket, and the other end 27B is connected to a fitting provided through the other of the first side surface portion 221 and the second side surface portion 222. An external piping portion such as an elbow is connected to the outer end of this fitting. In the illustrated example, one end 27A is supported by a bracket (not shown) provided on the inside of the second side surface portion 222, and the other end 27B is connected to a pipe fitting 27D provided on the first side surface portion 221. The axis of the discharge pipe 27 is held at a position lower than the liquid level, and the inlet 271 is open so as to include the liquid level. Floating matter is discharged from the inlet 271 through the pipe interior 272 to the outside of the tank 20. Note that the discharge pipe 27 is preferably configured so that the position of the inlet 271 can be adjusted around the axis by loosening the fastening between the bracket on the second side surface portion 222 of the tank 20 and the pipe fitting 27D on the first side surface portion 221.

[0045] The adjustment section 20C contains adjusted water with a reduced amount of foreign matter. Neither this adjustment section 20C nor the upstream raw water section 20A is provided with a water flow obstruction member such as the partition plate 26 of the interceptor section 20B that obstructs the flow of water. The adjustment section 20C also has a first adjusted water outlet 220 for discharging water outside the tank 20. The upstream external piping section 50 extends from the first adjusted water outlet 220 to the multiple upstream nozzles 31.

[0046] The purifier 1 mixes fine bubbles into the water in the tank 20 to further purify the water in the tank 20. For this purpose, the purifier 1 is provided with a first bubble generator 61 and a second bubble generator 62.

[0047] (First Bubble Generator 61) The first bubble generator 61 discharges water contained in the raw water section 20A from the raw water section 20A, mixes fine bubbles into the water, and then returns the water to the raw water section 20A. The raw water section 20A is equipped with a raw water outlet 225A for discharging the water and a raw water return port 225B for returning the water with the fine bubbles mixed in. The raw water return port 225B is provided, for example, in one of the first side surface section 221, the second side surface section 222, or the third side surface section 223, and in the configuration example shown in Figures 3 and 4, it is provided in the second side surface section 222.

[0048] The first bubble generator 61 includes a first bubble pump 611, a first bubble mixer 612 located downstream of the first bubble pump 611, and a first bubble external piping section 613 extending from the raw water outlet 225A to the raw water return port 225B, including the first bubble pump 611 and the first bubble mixer 612. The first bubble external piping section 613 is configured by connecting pipes, joints, on-off valves, etc. The first bubble mixer 612 may be, for example, a static mixer. The first bubble mixer 612 generates fine bubbles, either or both of ultrafine bubbles (so-called nanobubbles) with diameters of several tens of nanometers to 1 μm and microbubbles with diameters of 1 μm to 100 μm.

[0049] 2, air for fine bubbles is supplied from air supply source 66A such as a compressor via external air piping 66B indicated by a dashed line and connected to first external bubble piping 613. For example, air is supplied to water flowing between first bubble pump 611 and first bubble mixer 612, and fine bubbles are generated in first bubble mixer 612. External air piping 66B is composed of pipes, joints, on-off valves, etc.

[0050] (Auxiliary tank nozzle 28) The purification device 1 may include an auxiliary tank nozzle 28 inside the tank 20. As shown in FIGS. 1 and 6, the auxiliary tank nozzle 28 is disposed above the liquid surface in the interceptor section 20B, close to the top surface 23. As shown in FIG. 5, multiple auxiliary tank nozzles 28 are provided, and they are aligned in the direction k of the interior dimension (a22) from the first side surface 221 to the second side surface 222 that defines the space 25. Furthermore, the axes of the multiple auxiliary tank nozzles 28 are tilted perpendicular to the direction k. Specifically, as shown in FIG. 6, the base 28A of each auxiliary tank nozzle 28 is positioned higher than the tip 28B, and the base 28A is located upstream of the tip 28B. The auxiliary tank nozzle 28 sprays water toward downstream air. In the drawings, water sprayed from the auxiliary tank nozzle 28 is represented by a dashed triangle. This purifies the air that has passed through the raw water section 20A inside the tank 20. Water containing fine bubbles is also sprayed from the tank auxiliary nozzle 28 onto the inner surface of the tank 20, that is, onto the first side surface 211, second side surface 222, fourth side surface 224, etc. that define the space 25.

[0051] 2 and 4, branch pipe 28C branching off from first bubble external piping 613 of first bubble generator 61 is connected to tank auxiliary nozzle 28. This causes water mixed with fine bubbles to be sprayed from tank auxiliary nozzle 28 into the inside of tank 20. Branch pipe 28C is made up of pipes, joints, on-off valves, etc. Furthermore, apart from the multiple tank auxiliary nozzles 28 and piping components such as straight pipes and joints connected to them, and partition plate 26 (protruding plate 262) protruding from the liquid surface, space 25 of tank 20 does not have any plate-shaped or other obstructing members to obstruct the flow of air inside.

[0052] (Second bubble generator 62) The second bubble generator 62 discharges the water contained in the adjustment unit 20C out of the adjustment unit 20C, mixes fine bubbles into it, and then returns it to the adjustment unit 20C. The adjustment unit 20C is equipped with a second adjusted water outlet 226A for discharging the water out of the adjustment unit 20C, and an adjusted water return port 226B for returning the water with fine bubbles mixed in to the adjustment unit 20C. The second adjusted water outlet 226A and the adjusted water return port 226B are provided, for example, in any of the first side surface portion 221, the second side surface portion 222, or the fourth side surface portion 224, and are provided in the second side surface portion 222 in the configuration example shown in Figures 3 and 4. The second bubble generator 62 includes a second bubble pump 621, a second bubble mixer 622 provided downstream of the second bubble pump 621, and a second bubble external piping section 623 extending from the adjusted water second outlet 226A to the adjusted water return port 226B, including the second bubble pump 621 and the second bubble mixer 622. The second bubble external piping section 623 is configured by connecting pipes, joints, on-off valves, etc. The second bubble mixer 622 can be, for example, a static mixer type.

[0053] 2, a branch pipe 66C (shown by a dashed line) branches off from the external air piping 66B and is connected to the second external bubble piping 623. The air is supplied to the second bubble generator 62 through water flowing between the second bubble pump 621 and the second bubble mixer 622, and fine bubbles are generated in the second bubble mixer 622. The branch pipe 66C is made up of pipes, joints, on-off valves, and the like. When the first bubble generator 61 and the second bubble generator 62 generate fine bubbles of ozone supplied from the outside, odors in the exhaust air can be further reduced.

[0054] The adjustment unit 20C is also provided with a first conditioned water outlet 220 for discharging water from the tank 20. For example, in the adjustment unit 20C, a second conditioned water outlet 226A and a conditioned water return port 226B are provided on one of the first side surface 221 and the second side surface 222, and the first conditioned water outlet 220 is provided on the other of the first side surface 221 and the second side surface 222. In FIG. 4, the second conditioned water outlet 226A and the conditioned water return port 226B are provided on the second side surface 222, and the first conditioned water outlet 220 is provided on the first side surface 221. As shown in FIG. 4, the conditioned water return port 226B preferably includes a straight pipe 226C protruding from the inside of the second side surface 222 and an elbow 226D provided at the tip of the straight pipe 226C. Changing the discharge direction with the elbow 226D prevents water containing a large amount of fine bubbles from flowing into the first conditioned water outlet 220 from the conditioned water return port 226B.

[0055] The first bubble generator 61 and the second bubble generator 62 can also be configured with different pipe diameters and pump performance. For example, the pipe diameter of the first bubble generator 61 can be made larger than that of the second bubble generator 62, and the amount of water delivered per unit time by the pump of the first bubble generator 61 can be made larger than that of the second bubble generator 62. Depending on the amount of fine bubbles generated by the first bubble generator 61 and the volume of the tank 20, the second bubble generator 62 can be omitted, and fine bubbles can be supplied to the tank 20 by the first bubble generator 61.

[0056] Reference numeral 70 in FIG. 2 denotes a power distribution board connected to the upstream pump 51, the first bubble pump 611, and the second bubble pump 621.

[0057] (Tank 20 water level maintenance function) The purification device 1 maintains a constant water level in the tank 20. As shown in Fig. 1, the purification device 1 includes an overflow section 29A provided in the adjustment section 20C that maintains the tank 20 at a predetermined water level, and a water supply pipe 29B that supplies water to the adjustment section 20C. Furthermore, as shown in the water supply piping diagram of Fig. 2, the upstream external piping section 50 includes an interceptor 80 upstream of the upstream pump 51. A monitoring device 90 monitors the water level in the interceptor 80.

[0058] (Overflow section 29A) An overflow section 29A is provided on the fourth side surface 224 of the tank 20, and discharges excess water and suspended solids to the outside of the tank 20. A wastewater treatment unit (not shown) for collecting and further treating the water and suspended solids may be provided downstream of the overflow section 29A and the discharge pipe 27.

[0059] (blocker 80) Figure 7 is a cross-sectional view of interceptor 80 taken along line S3-S3 in Figure 5. Interceptor 80 is held above installation surface G beside tank 20 by second support part 12. Interceptor 80 also includes a box 81 having a smaller volume than tank 20, two screens 841, 842 housed in box 81, and two liquid level sensors 851, 852 that measure the water level in box 81.

[0060] The second support portion 12 is formed by welding or the like of multiple vertical portions 121 extending vertically and multiple horizontal portions 122 extending horizontally. These are made of an aluminum alloy. The vertical portions 121 rise from the ground surface G via adjusters (not shown).

[0061] Figure 8 is an exploded oblique view of the box 81 of the interceptor 80 of Figure 5, and the box 81 comprises a box bottom 810 located at a position lower than the first adjusted water outlet 220, a box side portion 820 rising from the periphery of the box bottom 810 and having its upper end located at a position higher than the water surface in the tank 20, and a box top portion 830 located at the upper end of the box side portion 820.

[0062] The box bottom 810 has a rectangular outline in plan view. The box bottom 810 may be flat and horizontal, or may have a curved surface with the deepest point in the center (hereinafter referred to as the deepest part). In the configuration example shown in Figure 8, the box bottom 810 is formed by four connected inclined bottom parts that descend from the four long and short edges toward the center of the bottom. Furthermore, the deepest part of this box bottom 810 is formed as a drain outlet, and an open / close valve (not shown) is attached to the drain outlet.

[0063] The box side surface portion 820 includes a first box side surface portion 821 and a second box side surface portion 822 rising from the respective short side edges of the box bottom portion 810, and a third box side surface portion 823 and a fourth box side surface portion 824 rising from the respective long side edges of the box bottom portion 810. The first box side surface portion 821 is provided with a box inlet port 821A through which water from the adjustment portion 20C enters the box 81. The second box side surface portion 822 is provided on the opposite side of the first box side surface portion 821 and is provided with a box outlet port 822A through which water exits the box 81.

[0064] As shown in Fig. 8, the box inlet 821A has a larger inner diameter than the box outlet 822A. Furthermore, the box inlet 821A of the interceptor 80 has an inner diameter equal to that of the first regulated water outlet 220 of the adjustment section 20C, and the box inlet 821A and the first regulated water outlet 220 are set at the same height, and the interceptor 80 and the adjustment section 20C are connected via an elbow 52 as shown in Fig. 4.

[0065] Box top surface 830 is connected to the upper end of the rectangular box side surface 820 and closes the opening at the upper end of box side surface 820. Box top surface 830 also includes two fixed plates 831 that are spaced apart, an opening 832 formed between these fixed plates 831, and a plate-like lid 833 that closes opening 832. Opening 832 is formed to a size that allows screens 841, 842 to be inserted and removed from inside box 81, for example.

[0066] The screens 841 and 842 can be plate-shaped members with multiple through holes, such as punched metal formed by drilling multiple holes in a stainless steel plate. One screen 841 is located upstream, and the other screen 842 is located downstream. One surface 841A, 842A of each screen faces the inlet 821A, and the other surfaces 841B, 842B face the outlet 822A. The screens 841 and 842 rise from the box bottom 810, with one vertically extending edge positioned against the third box side surface 823 and the other vertically extending edge positioned against the fourth box side surface 824. The upper edges of the screens 841 and 842 are located higher than the water surface of the box 81. In Figure 7, the water surface of the box 81 is indicated by the symbol W2 and a two-dot chain line. As water flows from box inlet 821A to box outlet 822A, for example, screws are captured by screens 841 and 842. Screens 841 and 842 are detachably attached, for example, by bolts, to brackets (not shown) provided on the inside of third box side surface portion 823 and fourth box side surface portion 824.

[0067] Two screens 841, 842 are provided to divide the inside of the box 81 of the interceptor 80 into an upstream section 80A, a middle section 80B, and a downstream section 80C.

[0068] The liquid level sensors 851, 852 are attached to the box top surface 830 and extend into the water through holes (not shown) in the box top surface 830. One liquid level sensor, 851, is provided between the box inlet 821A (first box side surface 821) and the upstream screen 841, i.e., in the upstream section 80A. The other liquid level sensor, 852, is provided between the downstream screen 842 and the box outlet 822A (second box side surface 822), i.e., in the downstream section 80C.

[0069] The interceptor 80 preferably includes measuring tubes 861 and 862. One end of each of the measuring tubes 861 and 862 is directly attached to the box top 830 or attached to the box top 830 via a bracket or the like, with its lower end submerged in water and its axis extending vertically. The liquid-contacting portions 851A and 852B of the liquid level sensors 851 and 852, which come into contact with water, measure the water level within the measuring tubes 861 and 862. Surrounding the liquid-contacting portions 851A and 852B within the measuring tubes 861 and 862 prevents the liquid-contacting portions 851A and 852B from vibrating due to, for example, water flow. Because the liquid surface in the tank 20 ripples due to air flow, this embodiment measures the water level in the interceptor 80, which is not affected by the exhaust air. In particular, when the measuring tubes 861 and 862 are provided, the liquid level within the measuring tubes 861 and 862 is measured. The liquid level sensors 851 and 852 are not limited to those that come into contact with water, and non-contact types can also be used.

[0070] The monitoring device 90 monitors the water level in the upstream portion 80A of the interceptor 80 based on the measurement value of the liquid level sensor 851. The monitoring device 90 may include a display unit such as a monitor that displays the measurement value of the liquid level sensor 851, and an operation unit such as a switch that is operated by the user to supply water from the water supply pipe 29B to the adjustment unit 20C.

[0071] The monitoring device 90 also monitors the water level in the downstream portion 80C of the interceptor 80 based on the measurement value of the liquid level sensor 852. The monitoring device 90 may include a display unit such as a monitor that displays the measurement value of the liquid level sensor 852, and an alarm unit such as a lamp or speaker that notifies the user when the measurement value of the liquid level sensor 852 drops to a predetermined water level. This allows the user to know that either the screen 841 or 842 is clogged.

[0072] The upstream exhaust flow path 30, the tank 20, the downstream exhaust flow path 40, the nozzle, the piping, the demister 43, and the interceptor 80 that constitute the purification device 1 are made of stainless steel.

[0073] In the purification device 1 configured in this manner, the water contained in the tank 20 is sent together with the fine bubbles from the first adjusted water outlet 220 of the first side surface portion 221 via the upstream pump 51 to the upstream nozzle 31 of the upstream exhaust flow path 30. When the water containing the fine bubbles is sprayed from the upstream nozzle 31 in the upstream exhaust flow path 30, foreign matter in the air is collected together with the water from the upstream exhaust flow path 30 into the raw water section 20A of the tank 20.

[0074] Then, the first bubble generator 61 mixes fine bubbles into the water contained in the raw water section 20A, and the water flows from the raw water section 20A to the adjustment section 20C by the upstream pump 51.In the interception section 20B provided between the raw water section 20A and the adjustment section 20C, the water containing foreign matter flows alternately through the descending flow path and the ascending flow path between the partition plates 26, and the foreign matter is collected as floating matter on the liquid surface between the protruding plates 262, and the foreign matter is discharged from the discharge pipe 27 to the outside of the tank 20, thereby purifying the water.

[0075] Furthermore, according to the purifier 1, the inner surface of the tank 20 is cleaned with fine bubbles, reducing the adhesion of foreign matter. Therefore, compared to the purifier of Patent Document 1, the user of the purifier 1 can use the purifier 1 for a long period (e.g., six months or more) without cleaning the tank 20. Furthermore, Patent Document 1 includes multiple baffles inside the tank to prevent direct passage to the exhaust pipe (reference numeral 10 in Fig. 3 of Patent Document 1), and Patent Document 2 also includes an elbow inside the tank to redirect the air flow and cause it to collide with the side (reference numeral 16 in paragraph 0013 and Fig. 2 of Patent Document 2), thereby limiting the airflow. In the purifier 1 of this embodiment, the space 25 is provided with the tank auxiliary nozzle 28, its piping components, and the protruding plate 262, but these do not significantly impede ventilation. Furthermore, in the present invention, the opening 40A at the upper end of the downstream exhaust flow path 40 is open, ensuring sufficient airflow.

[0076] Furthermore, water containing fine bubbles is also sprayed from the upstream nozzle 31 into the upstream exhaust flow path 30, thereby reducing adhesion of foreign matter to the inner surface of the upstream exhaust flow path 30. In addition, water containing fine bubbles is also sprayed from the tank auxiliary nozzle 28 onto the inner surface defining the space 25 of the tank 20, thereby reducing adhesion of foreign matter.

[0077] In the jet scrubber type purification device 1, the water level in the interceptor 80, which is not affected by the flow of exhausted air, is measured, particularly the liquid level in the measuring tube 861 if a measuring tube 861 is provided, and water is supplied to the adjustment section 20C of the tank 20 to maintain the tank 20 at a desired water level and operate the purification device 1. As this water is supplied, suspended matter is discharged from the overflow section 29A of the adjustment section 20C to the outside of the tank 20, allowing the water in the tank 20 to be further purified.

[0078] The present invention can be practiced without being limited to the above-described and illustrated examples.

[0079] (Upstream auxiliary nozzle 33) FIG. 9 is a diagram illustrating another exemplary configuration of a purification device. The purification device may include multiple upstream auxiliary nozzles 33 in the upstream exhaust flow path 30 at a higher position than the upstream nozzles 31. For example, four upstream auxiliary nozzles 33 are provided at the same height in the upstream exhaust flow path 30. Branch pipes 55 branching from the upstream external piping section 50 connect these upstream auxiliary nozzles 33, and water containing fine bubbles is sent to the upstream auxiliary nozzles, which spray the water downward. When multiple upstream auxiliary nozzles 33 are provided in this manner, as shown in FIG. 9 , if the upstream nozzle 31′ and the upstream auxiliary nozzles 33 are projected onto an imaginary horizontal plane P, which is lower than the upstream nozzle 31′, the upstream auxiliary nozzles 33 are positioned around the upstream nozzle 31′ on the imaginary horizontal plane P, as shown in FIG. 10 . Here, the upstream auxiliary nozzles 33 are set to a wider spray angle (e.g., 112 degrees) than the upstream nozzles 31' at which water is sprayed. By adding these upstream auxiliary nozzles 33, air purification can be further improved.

[0080] It can be used not only to remove dust but also to purify the air generated when hardening steel or the like. [Explanation of symbols]

[0081] 1 Purification equipment 11 First support part 12 Second support part 20 Tank 20A Raw Water Section 20B Blocker 20A adjustment part 21 Bottom 26 Partition plate 261 Submerged board 262 Projection plate 27 Discharge pipe 28 Tank auxiliary nozzle 29A Overflow section 29B Water supply pipe 30 Upstream exhaust flow path 31 Upstream nozzle 33 Upstream auxiliary nozzle 40 Downstream exhaust flow path 50 Upstream external piping section 51 Upstream pump 61 First Bubble Generator 62 Second Bubble Generator 80 Blocker Box 81 810 Box bottom 820 Box side 821A Box inlet 822A Box Outlet 830 Box top surface 851,852 Liquid level sensor 841,842 screens 841A One side 841B The other side G Installation surface P Virtual horizontal plane

Claims

1. a first support portion rising from the installation surface; a tank held above the installation surface by the first support portion; a cylindrical upstream exhaust flow path provided above the tank, the upstream exhaust flow path having an axis extending vertically and an interior of the upstream exhaust flow path communicating with the interior of the tank; a downstream exhaust flow path having a rectangular cylindrical shape, the downstream exhaust flow path being provided on the tank and having an axis extending vertically, the interior of the downstream exhaust flow path being in communication with the interior of the tank, and the upstream exhaust flow path being open at its upper end; a plurality of upstream nozzles provided vertically apart inside the upstream exhaust flow path and configured to spray water downward; An upstream outer piping section that sends the water from the tank to the upstream nozzle, a first bubble generator provided outside the tank; The tank is a raw water section provided below the upstream exhaust flow path; an interceptor section that collects foreign matter contained in the water from the raw water section; an adjustment section that is provided below the downstream exhaust flow path and that accommodates the water that has passed through the interceptor section; The first bubble generator discharges the water from the raw water section, mixes fine bubbles into the water, and returns the water to the raw water section. The interceptor portion is A plurality of partition plates provided at intervals in a direction from the raw water section toward the adjustment section; a discharge pipe for discharging the foreign matter on the water surface from a plurality of inlets through the inside of the pipe to the outside of the tank, The upstream external piping section is connected to a first adjusted water outlet provided in the adjustment section, and sends the water mixed with the fine bubbles to the upstream nozzle.

2. A plurality of auxiliary tank nozzles are provided above the water surface at the interceptor section; The purification device according to claim 1, characterized in that the water containing the fine bubbles is sent to the tank auxiliary nozzle through a branch pipe branching from the first bubble generator.

3. a plurality of upstream auxiliary nozzles are provided at positions higher than the upstream nozzle provided at the highest position inside the upstream exhaust flow path, When the upstream nozzle and the upstream auxiliary nozzle provided at the highest position are projected onto an imaginary horizontal plane, the upstream auxiliary nozzles are provided around the upstream nozzle, the upstream auxiliary nozzle is set to have a larger jetting angle than the upstream nozzle and faces downward, 2. The purification device according to claim 1, wherein the water containing the fine bubbles is sent to the upstream auxiliary nozzle through a branch pipe branching from the upstream outer piping section.

4. The purification device according to claim 1, further comprising a second bubble generator that is provided outside the tank, discharges the water outside the adjustment section, mixes the fine bubbles into the water, and returns the water to the adjustment section.

5. the tank has a bottom formed from the raw water section to the adjustment section, The purification device described in claim 1, characterized in that the partitions are submerged plates that rise from the bottom and are submerged, and protruding plates that are held above the bottom and have their upper ends protruding from the water surface, and are arranged alternately in a direction from the raw water section to the adjustment section.

6. The purification device according to claim 5, characterized in that a distance d1 between the upstream side protruding plate and the downstream side submerged plate is set wider than a distance d2 between the upstream side submerged plate and the downstream side protruding plate.

7. 6. The purification device according to claim 5, wherein one of the plurality of protruding plates provided closer to the adjustment portion protrudes higher than the remaining ones, the difference in height being 100 mm or more.

8. a water supply pipe that supplies water to the adjustment unit; an overflow portion provided in the adjustment portion, The upstream external piping section is an upstream pump for sending the water to the upstream nozzle; an interceptor provided upstream of the upstream pump and provided next to the tank by a second support portion that rises from the installation surface; The interceptor is Box and a liquid level sensor that measures the water level in the box for supplying water from the water supply pipe to the adjusting unit; a screen; The box The bottom of the box, a box side portion that rises from the periphery of the box bottom and is provided at a position where its upper end is higher than the water surface of the tank, and that has a box inlet and a box outlet located opposite the box inlet; a box top surface portion that is provided at an upper end of the box side surface portion and supports the liquid level sensor, 2. The purification device according to claim 1, wherein the screen is formed in a plate shape, and divides the inside of the box with one surface facing the box inlet and the other surface facing the box outlet.

9. the upstream exhaust flow path, the space portion of the tank, and the downstream exhaust flow path are each set so that the downstream side has a larger cross-sectional area for ventilation than the upstream side, 2. The purification device according to claim 1, further characterized in that the downstream exhaust flow path is lower in height from the top surface of the tank than the upstream exhaust flow path.

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