CN103691343A - Concentric double-shaft gas-liquid stirring device - Google Patents

Abstract

The invention discloses a concentric biaxial gas-liquid stirring device. Including stirring tank, outer stirring shaft, inner stirring shaft, frame-type outer paddle, inner paddle, gas distributor and air intake device; the inner stirring shaft is divided into upper and lower sections, which are connected by flanges, and the upper section of the inner stirring shaft is empty In the hole of the outer stirring shaft, symmetrical beams are welded on both sides of the outer stirring shaft. In the stirring tank, a frame-type outer paddle, inner paddle and gas distributor are coaxially installed, and an air intake device is installed outside the bottom of the stirring tank. Stirring There is a discharge port on one side of the bottom of the tank. The invention has high yield, few by-products, good gas-liquid dispersion performance, wide adaptability, convenient operation, flexible adjustment. The speed, rotation mode, and paddle combination of the inner and outer paddles can all be adjusted according to different systems and gas-liquid mixing purposes; in addition, the disassembly and assembly of the gas distributor is also relatively easy. It is especially suitable for gas-liquid stirring in high-viscosity and variable-viscosity systems.

Description

Concentric twin-shaft gas-liquid stirring device

technical field

The invention relates to a stirring device, in particular to a concentric double-shaft gas-liquid stirring device suitable for high-viscosity and variable-viscosity systems.

Background technique

Gas-liquid stirred reactors are widely used in process industries such as petroleum, chemical industry, sewage treatment, and biological fermentation. The existing gas-liquid stirring reactor is mainly a uniaxial gas-liquid stirring system, which has the disadvantages of single function and is only suitable for specific technological processes. It has good stirring and mixing performance in water or low-viscosity system, and the gas-liquid dispersion performance is good, but In the high viscosity and variable viscosity system, the gas-liquid stirring effect is poor, the production rate is low, and the power consumption is large. In actual industrial production, the physical properties of the system involved in the gas-liquid mixing operation are mostly complex: high viscosity or shear thinning of the material, such as the production of xanthan gum. Therefore, the development and research of new and efficient gas-liquid stirring devices has very significant practical significance.

In recent years, the research and development of the twin-shaft agitator has been widely proven to have wider adaptability than the single-shaft agitator. It is suitable for high-viscosity and variable-viscosity systems, and has the advantages of good mixing effect and low power consumption. However, these studies and applications are mainly carried out in single-phase systems, and few people have studied and developed biaxial gas-liquid stirring devices in gas-liquid two-phase systems, especially concentric biaxial gas-liquid stirring devices with frame-type outer paddles. . Due to the large diameter of the outer paddle, which is generally 0.9-0.98 times the diameter of the kettle body, the distance between the outer paddle and the kettle wall is quite small, and an air inlet device (usually a gas distributor) must be installed in the gas-liquid stirring reactor. Therefore, if one wants to design a concentric biaxial gas-liquid stirring device, how to arrange the outer paddle and the gas distributor must be solved.

Contents of the invention

The purpose of the present invention is to provide a concentric biaxial gas-liquid stirring device suitable for high-viscosity and variable-viscosity systems through the innovative design of frame-type outer paddles and gas distributors, so as to achieve energy-saving and high-efficiency gas-liquid stirring operations.

The purpose of the present invention is achieved through the following technical solutions:

The invention includes a stirring tank, an outer stirring shaft, an inner stirring shaft, a frame-type outer paddle, an inner paddle, and a gas distributor; the inner stirring shaft is divided into upper and lower sections, which are connected by flanges, and the upper section of the inner stirring shaft is empty and stirred outside In the shaft hole, symmetrical beams are welded on both sides of the outer stirring shaft. In the stirring tank, a frame-type outer paddle is installed. The frame-type outer paddle is coaxially equipped with an inner paddle and a gas distributor. The air inlet device has a discharge port on the bottom side of the stirring tank.

The middle opening at the bottom of the frame-type outer paddle, the middle opening of the frame-type outer paddle is welded together by iron rings, the two upper end faces of the frame-type outer paddle are respectively fixedly connected with the end faces of the two beams, and the diameter of the frame-type outer paddle is The inner diameter of the stirring tank is 0.9 to 0.98 times, and the lower part of the inner stirring shaft in the frame-type outer paddle is equipped with more than one inner paddle.

The gas distributor includes an annular tube with an air outlet in the lower part, a horizontal tube and a vertical tube, the inner ring of the annular tube is welded with a horizontal tube, the horizontal tube is welded with a vertical tube, and a ring is welded in the middle of the vertical tube , the lower part of the vertical pipe is respectively provided with internal threads and external threads.

The air intake device is formed by connecting a double-head joint, a two-way valve, a quick joint and an air intake pipe from top to bottom, and the upper end of the double-head joint is connected with the internal thread at the lower part of the vertical pipe of the gas distributor.

The inner paddle is a six straight blade disc turbine blade or a six straight blade opening turbine blade or a six oblique blade opening turbine blade.

The beneficial effects that the present invention has are:

1) High yield and less by-products. Due to the existence of the frame-type outer paddles, the same stirring and mixing effect is achieved. The concentric two-axis gas-liquid stirring device requires a lower speed than the traditional single-shaft stirring device, so the shear force is relatively small, and the gas-liquid stirring reactor is relatively small. The shear damage of raw materials and products is small, so the yield can be increased and the formation of by-products can be reduced.

2) Good gas-liquid dispersion performance. Due to the existence of the frame-type outer paddle, the gas holdup in the near-wall area is higher than that of the traditional uniaxial gas-liquid stirring device, and the overall dispersion effect in the gas-liquid reactor is better.

3) Wide adaptability. It has good stirring mixing and gas-liquid dispersion performance in medium-high viscosity and viscous systems.

4) Easy to operate, flexible and adjustable. The speed, rotation mode, and combination of paddles of the inner and outer paddles can all be adjusted according to different systems and gas-liquid mixing purposes; in addition, the disassembly and assembly of the gas distributor is also relatively easy.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a structural principle diagram of the air intake device part in the present invention.

Fig. 3 is a front view of the middle frame type outer propeller of the present invention.

Fig. 4 is a top view of the middle frame type outer propeller of the present invention.

Fig. 5 is a front view of the gas distributor in the present invention.

Fig. 6 is a top view of the gas distributor in the present invention.

In the figure: 1. Stirring tank, 2. Outer stirring shaft, 3. Inner stirring shaft, 4. Framed outer paddle, 5. Inner paddle, 6. Gas distributor, 7. Gasket, 8. Nut, 9. Double Head joint, 10, two-way valve, 11, quick connector, 12, intake pipe, 1.1, bushing, 1.2, discharge port, 2.1, beam, 2.2, fixed plate, 4.1, iron ring, 4.2, reinforcing rib, 4.3 , Rectangular plate, 6.1, ring, 6.2, internal thread, 6.3, external thread.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 1, the present invention includes a stirring tank 1, an outer stirring shaft 2, an inner stirring shaft 3, a frame-type outer paddle 4, an inner paddle 5, a gas distributor 6, a gasket 7, a nut 8, a double-head joint 9, Two-way valve 10, quick connector 11, air intake pipe 12; inner stirring shaft 3 is divided into upper and lower sections, which are connected by flanges, and the upper section of inner stirring shaft 3 is empty sleeved in the hole of outer stirring shaft 2 (that is, the inner stirring shaft 3 The rotation does not drive the outer stirring shaft 2 to rotate), the lower part of the inner stirring shaft 3 is detachable, and it can be made into different lengths, which is convenient for assembly, disassembly and replacement of the inner paddle 5; symmetrical beams 2.1 are welded on both sides of the outer stirring shaft 2, There are fixed plates 2.2 at the ends of the two beams 2.1, which are convenient for fixed connection with the frame-type outer paddle 4. In the stirring tank 1, the frame-type outer paddle 4 is installed, and the frame-type outer paddle 4 is coaxially equipped with the inner paddle 5, The gas distributor 6 and the gasket 7, the gasket 7 is inserted into the gas distributor 6 from the lower end of the vertical tube of the gas distributor 6, and the gas distributor 6 is inserted into the center of the head of the mixing tank 1 from top to bottom Inside the casing 1.1, the gasket 7 is pressed on the bottom of the stirring tank 1, and a nut 8 and an air intake device are installed on the outside of the bottom of the stirring tank 1. The nut 8 is installed to fix the gas distributor by thread locking, and the stirring tank 1 There is a discharge port 1.2 on one side of the bottom for discharge.

As shown in Fig. 1, Fig. 3 and Fig. 4, the bottom opening of the frame-type outer paddle 4 is welded together by the iron ring 4.1, so that the gas distributor 6 can be removed from the iron ring 4.1. Insert, the upper part of the frame-type outer paddle 4 is welded with reinforcing ribs 4.2, so that the frame-type outer paddle 4 remains stable during rotation, and the end of the frame-type outer paddle 4 connected with the outer stirring shaft 2 is a rectangular flat plate 4.3. The diameter of the paddle 4 is 0.9 to 0.98 times the inner diameter of the stirring tank 1, and the lower section of the inner stirring shaft 3 located in the frame-type outer paddle 4 is equipped with more than one inner paddle 5, and the number of the inner paddle 5 in Fig. 1 is 1 One, the number of the inner paddle 5 varies according to changes in properties such as the height of the material and the viscosity of the material.

As shown in Fig. 1, Fig. 2, Fig. 5, and Fig. 6, the gas distributor 6 includes an annular pipe, a horizontal pipe and a vertical pipe with an air outlet in the lower part, the inner ring of the annular pipe is welded with a horizontal pipe, and the horizontal The pipe is welded with a vertical pipe, and a ring 6.1 is welded in the middle of the vertical pipe. The lower part of the vertical pipe is respectively provided with an internal thread 6.2 and an external thread 6.3. The external thread 6.3 is used to install the nut 8, and then locked by thread The gas distributor 6 is fixed, and the internal thread 6.2 is opened to connect the air intake device, and the threaded connection makes the disassembly and replacement of the air intake device and the gas distributor 6 more convenient and quick. The ring diameter of the annular pipe portion of the gas distributor 6, the diameter of the vertical pipe, and the position of the ring 6.1 on the vertical pipe, the total height of the gas distributor 6 and the thread height and other parameters can be changed to adapt to different conditions and operating conditions.

As shown in Figures 1 and 2, the air intake device is formed by connecting a double-head joint 9, a two-way valve 10, a quick joint 11 and an air intake pipe 12 from top to bottom, and the upper end of the double-head joint 9 is connected with the gas The internal thread 6.2 of the lower part of the vertical pipe of the distributor 6 is connected, the two-way valve 10 can prevent the liquid in the stirring tank 1 from flowing backward, and the quick joint 11 can quickly disassemble the inlet pipe 12; the structure of this inlet device makes the gas distributor 6 It is also more convenient to replace and disassemble.

As shown in Figure 1, the inner paddle 5 is a six-blade disc turbine paddle or six straight-blade open turbine paddles or six inclined-blade open turbine paddles, and the internal paddle 5 can be of different structural forms and different layers, Adjust according to actual working conditions and operating conditions.

Working principle of the present invention:

   First, install the gas distributor, insert the gas distributor into the casing at the bottom of the stirring tank from top to bottom from the inside of the stirring tank, press the bottom of the stirring tank through the gasket, and the outer thread of the lower part of the gas distributor is equipped with a nut, press and stir The sleeve at the bottom of the tank fixes the gas distributor by thread locking. Then, install the air intake device, screw the double-ended joint into the inner thread of the lower part of the gas distributor, connect the lower part of the double-ended joint to the two-way valve, and then connect the two-way valve to the quick connector, which is connected to the intake pipe. Next, the outer paddle is installed, and then the inner stirring shaft with the inner paddle is installed, so far the installation of the device is completed. Then start to feed, add to a certain height, turn on the motor, adjust the speed of the inner and outer paddles, after a period of rotation, open the two-way valve to ventilate into the stirring tank, the gas flows into the ring through the intake pipe, two-way valve, vertical pipe and horizontal pipe The gas flows into the stirring tank from bottom to top through the air outlet at the lower part of the ring tube, the purpose of which is to make the air flow into the stirring tank uniform. The outer paddle and the inner paddle are driven and controlled by different motors, and can have different rotation speeds and different steering directions. After the stirring is completed, stop the ventilation, close the two-way valve, open the discharge port for discharge, and then disassemble the inner paddle, outer paddle and gas distributor.

Claims (5)

1. A concentric twin-shaft gas-liquid stirring device, characterized in that it includes a stirring tank (1), an outer stirring shaft (2), an inner stirring shaft (3), a frame-type outer paddle (4), and an inner paddle (5) , gas distributor (6); the inner stirring shaft (3) is divided into upper and lower sections, which are connected by flanges, the upper section of the inner stirring shaft (3) is empty in the hole of the outer stirring shaft (2), and the outer stirring shaft (2) ) are welded with symmetrical beams on both sides. In the stirring tank (1), a frame-type outer paddle (4) is installed, and the frame-type outer paddle (4) is coaxially equipped with an inner paddle (5) and a gas distributor (6 ), an air intake device is installed outside the bottom of the stirring tank (1), and a discharge port (1.2) is opened on the bottom side of the stirring tank (1). 2. A concentric two-axis gas-liquid stirring device according to claim 1, characterized in that: the middle opening at the bottom of the frame-type outer paddle (4), the middle opening of the frame-type outer paddle is welded by the iron ring (4.1) Connected together, the two upper end surfaces of the frame-type outer paddle (4) are respectively fixedly connected with the end faces of the two beams, the diameter of the frame-type outer paddle (4) is 0.9 to 0.98 times the inner diameter of the stirring tank (1), and it is located in the frame-type More than one inner paddle (5) is housed in the lower section of the inner stirring shaft (3) in the outer paddle (4). 3. A concentric two-axis gas-liquid stirring device according to claim 1, characterized in that: the gas distributor (6) includes an annular tube with an air outlet in the lower part, a horizontal tube and a vertical tube, The inner circle of the annular pipe is welded with a horizontal pipe, the horizontal pipe is welded with a vertical pipe, a ring (6.1) is welded in the middle of the vertical pipe, and the lower part of the vertical pipe is respectively provided with an internal thread (6.2) and an external thread (6.3). 4. A concentric two-axis gas-liquid stirring device according to claim 1, characterized in that: the air inlet device consists of a double-head joint (9), a two-way valve (10), and The quick joint (11) is connected with the air inlet pipe (12), and the upper end of the double-head joint (9) is connected with the internal thread (6.2) at the lower part of the vertical pipe of the gas distributor (6). 5. A concentric twin-shaft gas-liquid stirring device according to claim 1, characterized in that: the inner paddle (5) is a six-blade disc turbine paddle or six straight-blade opening turbine paddles or six oblique blades Turn on the turbo paddles.

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