CN202945078U - Improved-blade stirring type extraction tower - Google Patents

Abstract

The utility model discloses an improved-blade stirring type extraction tower which comprises a transmission device and a tower body, wherein the tower body is sequentially provided with an upper clarifying tank, a tower body and a lower clarifying tank from top to bottom; a liquid distributor is arranged at the joints between the upper clarifying tank and the lower clarifying tank and the tower body respectively; a rotary shaft penetrates into the tower body; a transmission device is connected with the rotary shaft; an impeller group is arranged on the rotary shaft; an upper cover plate and a blade are arranged on each impeller; the blade is fixed on the upper cover plate, and the shape of the blade in the length direction is a parabola; a fixing ring is arranged on the inner side wall of the tower body; a light-phase outlet interface is formed at the upper part of the upper clarifying tank, and a heavy-phase inlet interface is formed at the lower part; a light-phase inlet interface is formed at the upper part of the lower clarifying tank, and a heavy-phase outlet interface is formed at the lower part; and an interface control device is arranged in the upper clarifying tank and the lower clarifying tank respectively. The system provided by the utility model can realize extraction and back extraction of the industrial high-COD wastewater hard to deal with, realizes high extraction and back extraction efficiency, and can separate pollutants from wastewater and recover useful substances.

Description

A Stirred Extraction Tower with Improved Paddle

technical field

The utility model belongs to the technical field of wastewater treatment and the technical field of chemical separation equipment, and in particular relates to an extraction and stripping device for efficiently removing COD in wastewater.

Background technique

The stirred extraction tower is a mechanically stirred extraction equipment equipped with a porous plate. The Kühni column is a typical stirred extraction column. This tower was proposed by Swiss Kühni Company in the 1960s, and it is mainly used for separation and purification of chemical industry. The design method of this tower has not been disclosed yet. Although the tower is widely used in Europe, it is rarely used domestically. The structure of the stirred extraction tower widely used in the prior art includes a tower body, a rotating shaft, a rotator, a power mechanism, an upper settling tank, a lower settling tank and a partition plate. The main factors affecting the mass transfer of the stirred extraction tower are the residual fraction of the dispersed phase and axial backmixing. The specific factors, sources, influence degree and influence area that cause backmixing are not fully studied. In order to improve the mass transfer efficiency of the extraction tower and suppress interstage backmixing, many scientific and technological workers have improved the existing extraction tower structure. Chinese invention patent CN1089015C discloses a rotating disk extraction tower equipped with interstage rotating baffles. The extraction tower includes a tower body, a fixed ring, a rotating shaft, a rotating disk and rotating baffles. Place the rotating baffle between the two turntables and fix it on the shaft, on the same plane as the fixed ring. The ratio of the diameter of the rotating baffle to the diameter of the turntable is 1-0.8:1, and the opening ratio on the rotating baffle 40%-60%. The invention can effectively suppress the axial back-mixing between the stages after adding the sieve baffle, and is beneficial to the mass transfer between the two phases in the rotary tower. Invention patent CN101693150A discloses a rotating disk extraction tower, which includes a tower body, a fixed ring, a rotating shaft, a rotating disk, a rotator, a power mechanism, a partition, an upper settling tank, and a lower settling tank. This patent improves the rotator. The rotator includes a blade seat and first and second blades. The blade seat is fixed on the rotating shaft. The first and second blades are distributed one by one. The orientation of the first inclination on the blade and the second inclination on the second blade are opposite to each other. The invention can effectively suppress interstage backmixing and enhance mass transfer efficiency. The utility model patent CN200960415Y discloses a mechanically stirred extraction tower, in which a stirring device is connected to each other in the extraction section, and a coupling is provided between the stirring shafts. The coupling includes a cylindrical main body, and inside the cylindrical main body, the upper part is Square hole, the lower part is a round hole, and the lower part has a tapered hole. The lower end of the stirring shaft is a circle that matches the square hole in the upper part of the cylindrical main body. Fitted square, the upper end of the stirring shaft is inserted into the circular hole at the lower part of the cylindrical main body, a tapered pin is arranged in the tapered hole, and the lower end of the stirring shaft is inserted into the square hole at the upper part of the cylindrical main body. The utility model has the advantages of convenient installation and positioning, small installation strength and convenient maintenance. The utility model patent CN201664526U discloses a centrifugal stirring extraction tower, the cylinder body includes an upper cylinder body, a main cylinder body and a lower cylinder body, the upper cylinder body is provided with a light-phase material outlet and a heavy-phase material inlet, and the cylinder body is equipped with a transmission The shaft and the transmission shaft are driven to rotate by the motor reduction mechanism arranged on the top of the tower body. A static ring is fixed on the inner wall of the main cylinder, and a moving ring is provided on the part where the transmission shaft is located in the main cylinder. The tower body is fixed on the skirt seat, and the bearing box is fixed inside the skirt seat. There is a shaft hole on the top of the bearing box, and a bearing is arranged in the bearing box. The lower part of the transmission shaft is inserted into the bearing through the bearing box hole, and the mechanical seal is placed on the transmission shaft. Adsorbents are arranged on the top, and horizontal grid plates are respectively arranged in the upper cylinder and the lower cylinder. The transmission shaft of the utility model is supported at both ends, and the bottom is supported by a bearing group. The bearing group can better withstand radial and axial forces, and the operation is relatively stable. The utility model patent CN202191725U discloses an extraction tower interface control device, including an extraction tower, a differential pressure transmitter and a solenoid valve are arranged on the extraction tower, and the differential pressure transmitter controls the opening of the solenoid valve. The utility model realizes automatic control through the switch of the differential pressure transmitter and the solenoid valve, so that the extraction agent does not enter the next section with the crude ester, which can avoid the problems of other boundary meters and better control the extraction dosage of the extraction tower, thereby The effect of the stabilization process.

To sum up, although the agitated extraction tower has the advantages of simple structure, convenient operation, ideal mass transfer efficiency and low energy consumption, there are still inter-stage back-mixing that affects the maximization of mass transfer efficiency, which is also the focus of the industry. technical issues that urgently need to be resolved. In addition, the interface control plays a key role in the design of the extraction column, and the fluctuation of the interface will lead to the instability of the fluid flow pattern in the column, thereby affecting the two-phase mass transfer. Since the solenoid valve or electric valve is fully open and fully closed, when the solenoid valve or electric valve is fully open, the continuous phase in the tower is discharged at a high speed instantaneously, which will cause the imbalance of fluid mechanics in the tower and may cause false flooding.

Utility model content

Technical problem: In view of the above problems, the utility model provides a stirring extraction tower with improved blades that can ideally suppress back-mixing between stages and improve the mixing effect between stages.

Technical solution: A stirring extraction tower with improved blades, including a transmission device and a tower body. The tower body is provided with an upper clarification tank, a tower body and a lower clarification tank in sequence from top to bottom. The upper clarification tank and the lower clarification tank are respectively equipped with There is a sight glass, and the connection between the upper clarification tank and the lower clarification tank and the tower body is respectively equipped with a liquid distributor. The tower body is penetrated with a rotating shaft, the transmission device is connected with the rotating shaft, and the impeller group is arranged on the rotating shaft. Composed of open impellers, each impeller is provided with an upper cover plate and 3-7 blades, the blades are fixed on the upper cover plate and are perpendicular to the upper cover plate, the shape of the blades in the length direction is parabolic, of which Taking the center of the rotating shaft as the origin and the above cover as the plane coordinate system, the blade profile equation satisfies y=a ₁ x+a ₂ x ² , 0.01≤a ₁ ≤0.5, 0.01≤a ₂ ≤1, 0≤x≤ 1200mm, the width of the paddle is 5mm-100mm; there is a fixed ring on the inner wall of the tower body, the upper part of the upper clarification tank is equipped with a light phase outflow interface, the lower part is equipped with a heavy phase inlet interface, and the upper part of the lower clarification tank is equipped with a light phase Inlet interface, the lower part is equipped with heavy phase outflow interface; the upper clarification tank and the lower clarification tank are respectively equipped with interface control devices to ensure the stability of the oil-water interface in the clarification tank.

The transmission device includes a motor and a reducer, the motor is connected to the reducer, the reducer and the motor are fixed on the top of the tower body, and the output shaft of the reducer is connected to the rotating shaft.

The upper cover plate is perforated, and the perforation rate is 10-60%.

The relationship between the spacing h of the fixed ring and the inner diameter D of the tower is h=0.225D ^0.6 , the fixed ring is provided with through holes, the opening rate is 30%-70%, and the size of the hole is 5mm-50mm.

The heavy phase outflow interface is provided with an electric valve, a solenoid valve and a shut-off valve.

The interface control device includes a signal acquisition device and a liquid level transmitter, the signal acquisition device is a capacitive level gauge or a conductivity electrode, and the signal acquisition device feeds back the collected water level signal to the liquid level transmitter, The closure of the electric valve, solenoid valve and stop valve is controlled by the liquid level transmitter, so as to ensure the stability of the oil-water interface in the clarification tank.

Beneficial effect:

The utility model is applied to the treatment of high COD wastewater, extracting high COD wastewater, or stripping the extracted organic solvent, and at the same time, through the interface control system, the extraction dose or wastewater metering is automatically controlled, thereby stabilizing the process. The stirring blades are parabolic. Compared with the traditional flat turntable, it is especially suitable for the removal of organic matter in wastewater. The removal rate of COD is more than 90%, and after stripping, the stripping efficiency reaches more than 99%.

Description of drawings

Fig. 1 is the structure schematic diagram of the agitated extraction tower improved by the blade of the utility model, in the figure the tower body (1), the transmission device (2), the rotating shaft (3), the impeller group (4), the fixed ring (5), the upper Clarification tank (6), lower clarification tank (7), upper sight mirror (8a), lower sight mirror (8b), heavy phase inlet port (9), light phase inlet port (10), heavy phase outflow port (11) , light phase outflow port (12), paddle (13), upper cover plate (14), upper liquid distributor (15a), lower liquid distributor (15b), motor (16), reducer (17), output Shaft (18), signal acquisition device (19), electric valve (21), solenoid valve (22), stop valve (23);

Fig. 2 is a top view structure diagram of the utility model impeller, in which the paddle (13) and the upper cover plate (14);

Figure 3 is a schematic diagram of interface control; first, set the height of the oil-water interface in the upper and lower clarification tanks, and the signal acquisition device measures the height of the oil-water interface in the tank during the operation of the equipment. After the comparator compares the set value with the measured value, the control Regulating valves (electric valves, solenoid valves, stop valves) discharge waste water and stripping agents so that the oil-water interface in the tank is highly stable.

Detailed ways

The utility model is further described below with specific examples, but the utility model is not limited thereto. The raw materials, equipment and reagents of the present invention are commercially available unless otherwise specified, or can be prepared according to conventional methods in the art. Unless otherwise defined or stated, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art.

Example 1:

The paddle improved stirring extraction tower, the tower body 1 can be composed of multiple units, the total height is about 2-45m, the diameter of the tower body 1 is about 100mm-2400mm, and the multiple tower body 1 units are built in the form of building blocks in the height direction Since the structure of the tower body 1 of each unit is the same regardless of the number of units in the tower body 1, the following description is only for one tower body 1. The upper clarification tank 6 is arranged on the tower body 1, the lower clarification tank 7 is arranged under the tower body 1, the upper clarification tank 6 and the lower clarification tank 7 are connected with the tower body 1 in a flange type, and the upper clarification tank 6 and the lower clarification tank The tank 7 is provided with an upper mirror 8a and a lower mirror 8b respectively, and the joints of the upper clarification tank 6 and the lower clarification tank 7 with the tower body 1 are respectively provided with an upper liquid distributor 15a and a lower liquid distributor 15b. The transmission device 2 is fixed on the top of the upper clarification tank, and the transmission device 2 is linked by the motor 16 and the reducer 17, and the reducer 17 carries the motor 16 and is fixed on the central part of the top of the upper clarification tank 6 . The output shaft 18 of the speed reducer 17 is connected with the rotating shaft 3, and its connection mode is a screw connection or a coupling connection. A set of fixing rings 5 are fixed at intervals on the inner wall of the tower body in the height direction, and the relationship between the spacing h (m) and the inner diameter D (m) of the tower is h=0.225D ^0.6 . The fixed ring 5 is fixed on the tower wall, the opening ratio of the fixed ring 5 is 30%-70%, and the size of the aperture is 5mm-50mm. The impeller group 4 of the extraction tower is made up of semi-open impellers, each impeller includes 3-7 paddles 13 and an upper cover 14, the paddles are fixed on the upper cover 14, and the paddles 13 are perpendicular to the upper cover 14, The upper cover plate 14 is perforated, and the perforation rate is 10-60%. The lengthwise shape of the paddle 13 is parabolic, and the width of the paddle 13 is 5mm-100mm. The profile of the blade is parabolic, and its profile equation is y=a ₁ x+a ₂ x ² , 0.01≤a ₁ ≤0.5, 0.01≤a ₂ ≤1, 0≤x≤1200mm, where the shaft center is the origin of the blade, and the cover plate is the plane coordinate system. The paddle 13 can be fixed on the upper cover plate 14 by welding, or can be fixed with right-angle screws. The upper cover plate 14 is fixed on the rotating shaft 3, and the upper cover plate can be fixed on the rotating shaft 3 by welding, or can be fixed on the rotating shaft 3 by screws. Interface control plays a key role in extraction column design. The interface control device is located in the middle part of the upper clarification tank 6 or the lower clarification tank 7. The interface control device includes a signal acquisition device and a liquid level transmitter. The signal acquisition device 19 is a capacitive level gauge or a conductivity electrode. The device feeds back the collected water level signal to the liquid level transmitter. When the water level in the clarification tank is too low, the liquid level transmitter closes the electric valve 21 or electromagnetic valve 22 and the stop valve 23. When the water level is too high, the liquid level The transmitter opens the electric valve 21 or the solenoid valve 22 and the shut-off valve 23 to discharge part of the water to ensure the stability of the oil-water interface of the clarifier tank.

Example 2:

Take a reactive dye wastewater 1 in Jiangsu, the COD in the wastewater is 2.24×10 ⁴ mg/L, the main structure is the same as in Example 1, wherein the diameter of the tower body is 313mm, the height of the tower body is 2800mm, the number of fixed rings is 21, and the impeller is 20 pieces, the profile of the blades is parabolic, each impeller has 3 blades, the profile equation is y=0.05x+0.05x ² , 5≤x≤150mm, when the speed of the shaft 2 is 50r/min , when the flow ratio of organic solvent to wastewater is 1:1, the removal rate of COD in effluent is 90%. When the paddle on the rotating shaft is a flat plate, when the rotating speed of the rotating shaft 2 is 50r/min, the flow rate of organic solvent and waste water, the removal rate of COD in the effluent is 80%. The extracted solvent is stripped by the above-mentioned extraction tower, and when the rotation speed of the rotating shaft 2 is 50 r/min, the stripping rate of the solvent reaches more than 99%.

Example 3:

Take a reactive dye wastewater 2 in Jiangsu, the COD in the wastewater is 4.07×10 ⁴ mg/L, the main structure is the same as in Example 2, wherein each impeller has 5 blades, and when the rotating speed of the rotating shaft 2 is 100 r/min, When the flow ratio of organic solvent to wastewater is 1.5:1, the removal rate of COD in the effluent is over 90%. The solvent after extraction is back-extracted by the above-mentioned extraction tower, and when the rotation speed of the rotating shaft 2 is 70 r/min, the solvent back-extraction rate reaches more than 99%.

Example 4:

Take a H-acid wastewater in Jiangsu, the COD in the wastewater is 10.07×10 ⁴ mg/L, the main structure is the same as in Example 2, in which, each impeller has 6 blades, and when the rotation speed of the shaft 2 is 100 r/min, the organic When the flow ratio of solvent to wastewater is 4:1, the removal rate of COD in the effluent is over 90%. The solvent after extraction is back-extracted by the above-mentioned extraction tower, and when the rotation speed of the rotating shaft 2 is 70 r/min, the solvent back-extraction rate reaches more than 99%.

Example 5:

Take a certain bisphenol s wastewater in Jiangsu, the COD in the wastewater is 2.03×10 ⁴ mg/L, the main structure is the same as that of Example 2, wherein each impeller has 6 blades, and when the rotation speed of the shaft 2 is 100 r/min, When the flow ratio of organic solvent to wastewater is 1:1, the removal rate of COD in the effluent is over 90%. The solvent after extraction is back-extracted by the above-mentioned extraction tower, and when the rotation speed of the rotating shaft 2 is 70 r/min, the solvent back-extraction rate reaches more than 99%.

Embodiment 6:

A paddle-improved agitated extraction tower, including a transmission device 2 and a tower body, the tower body is provided with an upper clarification tank 6, a tower body 1 and a lower clarification tank 7 sequentially from top to bottom, and the upper clarification tank 6 and the lower clarification tank 7 are respectively equipped with an upper mirror 8a and a lower mirror 8b, and the connection between the upper clarification tank 6 and the lower clarification tank 7 and the tower body 1 is respectively provided with an upper liquid distributor 15a and a lower liquid distributor 15b, and the tower body is provided with Rotating shaft 3, transmission device 2 is connected with rotating shaft, is provided with impeller group 4 on the rotating shaft, and described impeller group is made up of semi-open type impeller, and each impeller is provided with upper cover plate 14 and 3-7 blades 13, and the blades Fixed on the upper cover plate 14, and perpendicular to the upper cover plate, the shape of the blade in the length direction is a parabola, where the axis of the rotating shaft is the origin, the upper cover plate is the plane coordinate system, and the blade profile equation satisfies y= a ₁ x+a ₂ x ² , 0.01≤a ₁ ≤0.5, 0.01≤a ₂ ≤1, 0≤x≤1200mm, the paddle width is 5mm-100mm; the inner wall of the tower body is provided with a fixed ring 5, the upper The top of clarifier tank 6 is provided with light phase outflow interface 12, and the bottom is provided with heavy phase inlet port 9, and the top of lower clarifier tank 7 is provided with light phase inlet port 10, and the bottom is provided with heavy phase outflow interface 11; Upper clarifier tank 6 and The lower clarification tank 7 is respectively equipped with an interface control device to ensure a stable oil-water interface in the clarification tank.

The transmission device 2 includes a motor 16 and a reducer 17, the motor 16 is connected to the reducer 17, the reducer 17 and the motor 16 are fixed on the top of the tower body, and the output shaft 18 of the reducer 17 is connected to the rotating shaft 3.

The upper cover plate is perforated, and the perforation rate is 10-60%.

The fixed ring is provided with a through hole, the opening rate is 30%-70%, and the size of the aperture is 5mm-50mm.

The heavy phase outflow interface 11 is provided with an electric valve 21 , a solenoid valve 22 and a stop valve 23 .

The interface control device includes a signal acquisition device 19 and a liquid level transmitter, the signal acquisition device is a capacitive level gauge or a conductivity electrode, and the signal acquisition device feeds back the collected water level signal to the liquid level transmitter , The closure of the electric valve 21, the solenoid valve 22 and the shut-off valve 23 is controlled by the liquid level transmitter, so as to ensure the stability of the oil-water interface in the clarification tank.

Claims (6)

1. A paddle-improved agitated extraction tower, including a transmission device (2) and a tower body, is characterized in that the tower body is provided with an upper clarification tank (6), a tower body (1) and a lower clarification tank from top to bottom. The tank (7), the upper clarifier tank (6) and the lower clarifier tank (7) are respectively equipped with sight glasses, and the connection between the upper clarifier tank (6) and the lower clarifier tank (7) and the tower body (1) is respectively equipped with liquid Distributor, the shaft (3) runs through the tower body, the transmission device (2) is connected with the shaft, and the impeller group (4) is arranged on the shaft, and the impeller group is composed of semi-open impellers, and each impeller has an upper Cover plate (14) and 3-7 blades (13), the blade is fixed on the upper cover plate (14), and is perpendicular to the upper cover plate, and the shape of the blade in the length direction is parabolic, wherein the axis of rotation is The center is the origin of the blade, the above cover plate is the plane coordinate system, and the blade profile equation satisfies y=a ₁ x+a ₂ x ² , 0.01≤a ₁ ≤0.5, 0.01≤a ₂ ≤1, 0≤x≤1200mm , the paddle width is 5mm-100mm; the inner wall of the tower body is provided with a fixed ring (5), the upper part of the upper clarification tank (6) is provided with a light phase outflow port (12), and the lower part is provided with a heavy phase inlet port (9 ), the upper part of the lower clarification tank (7) is provided with a light phase inlet port (10), and the lower part is provided with a heavy phase outflow port (11); the upper clarifier tank (6) and the lower clarifier tank (7) are respectively equipped with interface control device to ensure the stability of the oil-water interface in the clarification tank. 2. A paddle-improved stirring extraction tower according to claim 1, characterized in that the transmission device (2) includes a motor (16) and a reducer (17), and the motor (16) and the reducer (17) connection, the reducer (17) and the motor (16) are fixed on the top of the tower body, and the output shaft (18) of the reducer (17) is connected with the rotating shaft (3). 3. The agitated extraction tower with improved paddles according to claim 1, characterized in that the upper cover plate is perforated, and the perforation rate is 10-60%. 4. The agitated extraction tower improved by a kind of paddle according to claim 1, characterized in that the relationship between the spacing h of the fixed ring and the inner diameter D of the tower is h=0.225D ^0.6 , and the fixed ring is provided with a through hole , the opening rate is 30%-70%, and the aperture size is 5mm-50mm. 5. A paddle-improved stirring extraction tower according to claim 1, characterized in that the heavy phase outflow interface (11) is provided with an electric valve (21), a solenoid valve (22) and a shut-off valve (23 ). 6. A paddle-improved stirring extraction tower according to claim 1, characterized in that the interface control device includes a signal acquisition device (19) and a liquid level transmitter, and the signal acquisition device is a capacitor Type level meter or conductivity electrode, the signal acquisition device feeds back the collected water level signal to the liquid level transmitter, and the liquid level transmitter controls the electric valve (21), solenoid valve (22) and stop valve (23) The closure of the tank ensures the stability of the oil-water interface in the clarification tank.

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