CN102989404B - A kind of impact flow reactor - Google Patents

Abstract

The invention discloses an impingement flow reactor. The reactor is provided with a feed port and a discharge port, and two guide tubes are arranged in the reactor, and a fluid collision is formed between the outlets of the guide tubes. In each guide tube, propellers are correspondingly provided, and the screw directions of the propellers are opposite, which are respectively used to push the fluid from the feed inlet to the fluid impact area through the guide tube. It is characterized in that the inner wall of each guide tube is set There are spiral deflectors. The invention not only retains strong microscopic mixing and continuous circulation of liquid, but also strengthens the impact process and mixing outside the impact area, shortens the time for the fluid in the reactor to achieve uniform mixing, greatly improves production efficiency, and can obtain good economic performance.

Description

An impinging flow reactor

technical field

The present invention relates to a reactor in the field of chemical production, in particular to an impinging flow reactor.

Background technique

The chemical reaction process is the core and key of chemical production. For most liquid phase reaction processes, the mass transfer and mixing effect of the reactor (device) device has a great influence on the reaction quality and efficiency. Stirred Tank Reactor (STR for short) is the most widely used reactor at present, but the mixing effect of STR is not ideal for the rapid reaction process, and even adversely affects the reaction quality and efficiency in some cases. Therefore, the research and development of a new type of high-efficiency mixing reactor has become an urgent problem to be solved in the current chemical industry to strengthen the rapid reaction process, and many impingement flow reactor patents have emerged as the times require. Its main feature is to achieve enhanced transmission through the high-speed impact of two opposing fluids After years of research, impinging flow shows good mixing characteristics, especially can significantly strengthen microscopic mixing. However, in many impingement flow reactor patents, such as the patent "An impingement flow reactor for liquid phase reaction" (patent number: CN200510045866.5), through the action of the pump, the liquid is given a certain speed to make it collide with each other. Another patent "Non-rotating vertical circulation impingement flow reactor" (Patent No.: CN200720083472.3) promotes the fluid to collide with each other through the action of the propeller in the guide tube, both of which can achieve the purpose of enhanced mixing, but due to the total flow It tends to move with streamlines, and it is difficult for the divided flow groups to contact each other. The above-mentioned patents only focus on the collision of two fluids. In addition, they rarely involve the movement of the fluid groups and the impact area. Therefore, the enhanced mixing in the impact area has a certain limit, and except for the enhanced mixing in the impact area, the mixing in other areas is weak.

Contents of the invention

The technical problem to be solved by the present invention is to provide an impingement flow reactor which can not only strengthen the impingement process of the impingement flow but also enhance the mixing of the flow field outside the impingement area in view of the above-mentioned deficiencies in the prior art.

The technical scheme adopted by the present invention to solve the above-mentioned technical problems is: an impingement flow reactor, on which a feed port and a discharge port are arranged, and two guide tubes are arranged in the reactor, and A fluid impact area is formed between the outlets of the guide tubes, and propellers are correspondingly provided in each guide tube, and the screw directions of the propellers are opposite, and are respectively used to push the fluid from the feed port to flow to the fluid impact area through the guide tube. It is characterized in that spiral guide vanes are arranged on the inner wall of each guide tube.

According to the above technical solution, the helical direction of each helical guide vane is the same as the helical direction of the corresponding propeller.

According to the above technical scheme, the outlets of the spiral guide vanes in the two guide cylinders are distributed in a dislocation manner.

According to the above technical scheme, the outlet positions of the two spiral guide vanes are 135°-225°.

According to the above technical solution, the reactor is a vertical reactor, and the two guide tubes are installed vertically and coaxially in the reactor, and the two propellers are coaxially installed in the corresponding guide tubes.

According to the above technical solution, the reactor is a horizontal reactor, and the two guide tubes are installed in the reactor symmetrically and coaxially on the left and right, and the two propellers are installed in the corresponding guide tubes.

According to the above technical solution, the blade inclination angle of the propeller is 15°-60°.

According to the above technical solution, the thickness of the spiral guide vane is 1/12-1/10 of the inner diameter of the guide cylinder.

According to the above technical solution, the pitch of the spiral guide vane is 1/3~1 of the inner diameter of the guide cylinder.

The beneficial effects obtained by the present invention are:

1. The reactor is equipped with a spiral guide vane on the inner wall of the guide tube, so that the fluid flow in the guide tube is accompanied by the interaction of strong rotation, turbulent flow and spiral flow, so that the turbulence intensity is greatly increased, and the tightness Then they collide with each other on the impact area, so as to further strengthen the impact process and obtain a higher enhanced mixing effect, and the rotating fluid can drive the fluid around the inlet and outlet of the guide tube to mix with each other, and its entrainment ability and mixing effect are better than those of no The large swirling flow expands the range of the mixed flow field. At the same time, due to the setting of the spiral guide vane inside the guide tube, streamline bending and flow oblique intersection appear, which improves the anisotropy of the flow field and makes the velocity in the flow field stratified. Obviously, increasing the velocity gradient strengthens the flow field mixing outside the impact zone;

2. The present invention not only retains strong microscopic mixing and continuous liquid circulation, but also strengthens the impact process and mixing outside the impact area, shortens the time for the fluid in the reactor to achieve uniform mixing, greatly improves production efficiency, and can Get good economic performance.

Description of drawings

Fig. 1 is a schematic structural view of a vertical impingement flow reactor.

Fig. 2 is a sectional view taken along line A-A of Fig. 1 .

FIG. 3 is a partial enlarged view of B in FIG. 1 .

Fig. 4 is a schematic diagram of the inclination angle of the propeller blade.

Fig. 5 is a schematic structural view of the guide tube.

Fig. 6 is a structural schematic diagram of a spiral guide vane.

Fig. 7 is a schematic diagram of the misalignment of the exit position of the spiral deflector.

Fig. 8 is a schematic diagram of the three-dimensional structure of an impingement flow reactor with a vertical structure.

Fig. 9 is a schematic structural view of a horizontal impingement flow reactor.

Fig. 10 is a schematic perspective view of a horizontal impact flow reactor.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Example 1:

As shown in Figures 1 to 8, an impinging flow reactor is a vertical structure, which includes a reactor support 1, a cylindrical reactor 3, a feed pipe 2, an exhaust pipe 5, and a discharge pipe 8. The guide tube 4, the spiral guide vane 7 and the propeller 6, the reactor 3 is fixed on the reactor support 1, and the upper and lower ends of the reactor 1 are provided with feed ports, which are connected by the feed pipe 2, so that The discharge pipe 8 is arranged at the lower end of the reactor 1, the exhaust pipe 5 is arranged at the upper end of the reactor 3, and two guide tubes 4 are coaxially installed at the upper and lower ends of the inside of the reactor 3. , the fluid impact area IZ is formed between the outlets of the guide tube, and two propellers 6 with opposite rotations are coaxially arranged in the guide tube 4, which are respectively used to push the fluid from the upper end and the lower end to the fluid through the guide tube 4 The flow in the impact zone IZ, in order to strengthen the impact process, a spiral guide vane 7 is provided on the inner wall of each guide tube.

The working process of the present invention is as follows: the rotation of the two propellers 6 drives the fluid in the reactor 3 to swirl into the guide tube 4 from the upper and lower feed ports respectively, because the fluid near the inner wall of the guide tube 4 is subjected to the spiral guide The flow plate 7 acts to hinder the longitudinal flow of the fluid, so that the fluid streamline bends and flows obliquely, and guides it to rotate and flow out of the guide tube 4, and collides with each other in the impact area IZ, and then the fluid flowing out of the impact area IZ passes through the guide tube 4 The area between the outer wall and the inner wall of the reactor 3 returns to the area between the propeller 6 and the end of the reactor 3. At the same time, in the inlet and outlet areas of the draft tube 4, due to the strong entrainment and Blending, the flow direction of the fluid is: from the inlet of the draft tube to the inner spiral of the draft tube to the impact area IZ, the fluid after impacting the impact area IZ to the outer wall of the draft tube and the inside of the reactor, and then to the guide tube. The inlet of the flow tube is circulated in this way.

According to tests, when the inclination angle α of the blades of the two propellers is 15°-60°, the mixing performance and circulation ability of the fluid can be further enhanced. In order to further increase the impact force of the present invention, the helical direction of each helical deflector can be made to be the same as the helical direction of the corresponding propeller.

As shown in Figure 7, since the fluid exits along the spiral guide vane 7, there is a certain exit angle, so the outlet position of the spiral guide vane between the two guide cylinders can be adjusted to make the outlet position It is distributed in a dislocation of 0°~360°. When the fluid flows out from the outlet position of the guide cylinder along the spiral deflector, different dislocation outflow angles can enhance the fluid entrainment, mixing ability and shear flow field, thereby strengthening the Flow field mixing during impact. When the outlet positions of the two spiral deflectors are at a β angle, and when the β angle is 135°~225°, the fluid outlet curl is superimposed and increased, the fluid entrainment and mixing are enhanced, and the impact effect is better.

The present invention can adjust the thickness of the spiral deflector 7. When the thickness increases, the longitudinal flow of the fluid will be hindered and the energy consumption will increase, but the disturbance of the flow mass will increase, the streamline will change, and the speed will also change, resulting in The velocity stratification of the fluid in the flow tube 4 is obvious, and the velocity gradient increases, so that the fluid mixing range and the turbulent intensity in the flow guide tube 4 increase, thereby strengthening the flow field mixing before impact. When the thickness L of the spiral deflector 7 is 1/12~1/10 of the inner diameter of the guide tube 4, within this range, the longitudinal flow of the fluid is less hindered, but the velocity gradient is larger, and the impact mixing effect is better.

The present invention can adjust the number of turns of the spiral guide vane 7. Because the height of the guide tube 4 is constant, when the number of turns of the spiral guide vane 7 changes, the pitch also changes. When the number of turns increases, the guide tube 4 The curl of the outlet of the internal fluid increases, which reduces the impact velocity, but its entrainment and mixing effect on the fluid at the inlet and outlet of the guide tube 4 is strengthened, which increases the fluid mixing range and turbulence intensity in the reactor, thus The impact process is enhanced. Since the height of the guide tube 4 is constant, because the change (such as decrease) of the inner diameter of the guide tube will affect the fluid flow rate (decrease) in the impact area of the reactor, and then affect the change (increase) of the energy dissipation rate per unit volume in the impact area. large), and the energy dissipation rate per unit volume (increase) has an important (enhanced) influence on microscopic mixing. When the pitch H of the spiral guide vane 7 is 1/3~1 of the inner diameter of the guide tube 4, the fluid The smaller exit angle increases the curl, which enhances the entrainment and mixing at the fluid outlet, and the impact mixing effect is better.

Example 2:

As shown in Figures 9 and 10, the impingement flow reactor described in Example 2 has basically the same structure as the impingement flow reactor in Example 1, except that it is a horizontal structure, and the feed The pipe 2 is arranged at the left and right ends of the reactor 3 , and the said draft tube 4 is arranged at the left and right ends of the reactor 3 .

In summary, the impingement flow reactor of the present invention not only retains strong microscopic mixing and continuous liquid circulation, but also strengthens the impact process and mixing outside the impact area, shortening the time for the fluid in the reactor to achieve uniform mixing , greatly improve production efficiency, and can obtain good economic performance.

Claims (5)

1. an impact flow reactor, described reactor is provided with charging aperture and discharge port, two guide shells are provided with in reactor, fluid impingement zone is formed between the outlet of guide shell, in each guide shell, correspondence is provided with screw, the hand of spiral of described screw is contrary, be respectively used to propelling fluid flow to fluid impingement zone from charging aperture through guide shell, the hand of spiral of each spiral diversion sheet is identical with the hand of spiral of its corresponding screw, it is characterized in that being provided with spiral diversion sheet on each guide shell inwall, the outlet of the spiral diversion sheet in two guide shells is in being dislocatedly distributed, the exit position of two spiral diversion sheets is 135 ° ~ 225 °, and the thickness of described spiral diversion sheet is 1/12 ~ 1/10 of guide shell internal diameter, and the pitch of described spiral diversion sheet is 1/3 ~ 1 of guide shell internal diameter.

2. a kind of impact flow reactor according to claim 1, is characterized in that: described reactor is vertical reactor, and two guide shells are vertically coaxial to be installed in reactor, being installed in corresponding guide shell of described two propeller coaxials.

3. a kind of impact flow reactor according to claim 1, is characterized in that: described reactor is horizontal reactor, the left and right symmetric coaxial of two guide shells be installed in reactor, described two screws are installed in corresponding guide shell.

4. a kind of impact flow reactor according to claim 2, is characterized in that: 15 ° ~ 60 °, the blade inclination angle of described screw.

5. a kind of impact flow reactor according to claim 3, is characterized in that: 15 ° ~ 60 °, the blade inclination angle of described screw.