Mixed fluidized bed reactor

Abstract

A water inlet and a crystal discharging port are formed in the side wall of the lower end of a reactor shell, a water outlet is formed in the side wall of the upper end of the reactor shell, a water distributor is fixedly installed at the bottom of the inner side of the reactor shell, and the water distributor is communicated with the water inlet in the side wall of the lower end of the reactor shell; the reactor guide barrel is fixedly installed in the upper section of the reactor shell, a dosing mixing opening is formed in the lower end of the reactor guide barrel, and the area between the lower end of the reactor guide barrel and the bottom face of the inner side of the reactor shell is a main reaction area of the reactor; the chemical can flow from top to bottom along the reactor flow guide barrel and flow into the main reaction area of the reactor along the chemical feeding and mixing opening of the reactor flow guide barrel to be subjected to crystallization reaction with waste water, rapid growth of crystals is facilitated, it is guaranteed that crystal particles discharged from the crystal discharging opening are all large particles, and the quality of crystal products is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a mixed fluidized bed reactor. Background Technology

[0002] Fluidized beds are widely used in the field of water resource recovery, but traditional fluidized beds have many drawbacks that affect their efficiency in practical applications. The uneven solid-liquid distribution in traditional fluidized beds can easily lead to excessively high or low concentrations of solids in localized areas. This uneven distribution not only affects the contact between the solid and liquid phases but can also cause "dead zones" or "conical flows" in the bed, thereby reducing the efficiency of water treatment and crystal growth.

[0003] In traditional fluidized bed crystallization, the uneven distribution of particulate matter in the water can easily lead to uneven crystal nucleation. This results in significant differences in crystal size across different regions, thus affecting the overall crystal quality and yield. In some cases, excessive nucleation may lead to the formation of too many small crystals, while larger crystals become difficult to form.

[0004] Therefore, ensuring the uniform distribution of materials and water in the fluidized bed is crucial for crystal formation and growth, and is of great significance for the stability and quality of the output. Summary of the Invention

[0005] To overcome the above-mentioned defects, the present invention provides a mixed fluidized bed reactor, which can effectively disperse and mix wastewater and reagents, and ensure the quality of crystal output.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A mixed fluidized bed reactor, comprising a reactor shell, a water distributor, and a dosing pipe. The reactor shell has an inlet and a crystal discharge port on its lower side wall, and an outlet on its upper side wall. The water distributor is fixedly installed at the bottom inner side of the reactor shell and communicates with the inlet on the lower side wall of the reactor shell. The reactor also includes a flow guide barrel, which is fixedly installed inside the upper section of the reactor shell. A dosing and mixing port is formed at the lower end of the flow guide barrel. The area between the lower end of the flow guide barrel and the bottom inner side of the reactor shell is the main reaction zone of the reactor. The outlet end of the dosing pipe extends downwards into the upper part of the flow guide barrel, allowing the reagent to flow downwards along the flow guide barrel and into the main reaction zone of the reactor through the dosing and mixing port to crystallize with the wastewater.

[0007] As a further improvement of the present invention, a dosing buffer with a barrel-shaped structure is formed at the upper end of the reactor guide barrel. A guide column with a cylindrical structure is also provided between the dosing buffer and the dosing mixing port. The upper end of the guide column is connected to the lower end of the dosing buffer, and the lower end of the guide column is connected to the upper end of the dosing mixing port. The radial dimension of the guide column is smaller than the radial dimension of the dosing buffer, and the dosing mixing port is a funnel-shaped structure with a radial dimension at the upper end smaller than that at the lower end.

[0008] As a further improvement of the present invention, the reactor guide barrel is located in the center of the upper section of the reactor shell, and the height of the upper end of the reactor guide barrel is not lower than the height of the water outlet on the reactor shell.

[0009] As a further improvement of the present invention, the reactor shell has a circular cross-section, the dosing buffer zone of the reactor guide barrel is a cylindrical structure without a top, the guide column of the reactor guide barrel is a slender cylindrical structure, and the dosing mixing port of the reactor guide barrel is a truncated conical structure.

[0010] As a further improvement of the present invention, at least one reflux outlet is provided on the side wall of the reactor shell, and a reflux inlet is provided on the side wall of the dosing buffer zone of the reactor guide barrel. Each reflux outlet is connected to the reflux inlet through a reflux pipe. A circulation pump is also provided, which can pump the reflux water from the reflux outlet into the reflux inlet. The reflux water and the reagent can be mixed in the reactor guide barrel and then discharged into the main reaction zone of the reactor through the dosing mixing port.

[0011] As a further improvement of the present invention, the reactor shell sidewall is provided with three reflux outlets from top to bottom, namely an ultrafine crystal reflux outlet, a fine crystal reflux outlet, and a medium crystal reflux outlet. The three reflux outlets are located in the area between the drain outlet and the crystal discharge outlet on the reactor shell. Each of the three reflux outlets is provided with an electromagnetic switch, and each electromagnetic switch controls the opening and closing of each reflux outlet.

[0012] As a further improvement of the present invention, the height of the reflux inlet on the upper side wall of the reactor guide tube is lower than the height of the outlet on the side wall of the reactor shell and the outlet of the dosing pipe.

[0013] As a further improvement of the present invention, the reactor shell is also provided with a reflux water inlet, which is connected to the reflux water inlet on the upper side wall of the reactor guide barrel through a pipe. The water inlet, crystal discharge port, water outlet, reflux water outlet and reflux water inlet on the reactor shell are respectively provided with flange connection ports for connecting the water inlet pipe, crystal discharge pipe, water outlet pipe and reflux pipe.

[0014] As a further improvement of the present invention, a water distribution plate is fixedly installed on the inner side of the lower end of the reactor shell, and a water inlet cavity is formed between the water distribution plate and the bottom surface of the lower end of the reactor shell. The water inlet on the side wall of the reactor shell is connected to the water inlet cavity. A number of distribution holes are evenly spaced on the water distribution plate, and a T-shaped water distribution head is installed on each distribution hole. Wastewater in the water inlet cavity can be evenly distributed to the main reaction zone of the reactor through each T-shaped water distribution head.

[0015] As a further improvement of the present invention, the T-shaped water distribution head includes a water inlet pipe of a column and a T-shaped cavity. The top surface of the T-shaped cavity is sealed, and a connecting hole is formed in the middle of the bottom surface of the bottom end. A plurality of strip-shaped water distribution holes are evenly spaced around the connecting hole, and the plurality of strip-shaped water distribution holes extend radially along the bottom surface of the bottom end of the T-shaped cavity. The water inlet pipe is open at both the top and bottom. The bottom end of the water inlet pipe is a water inlet end that is sealed and connected to the distribution hole of the water distribution plate, and the top end of the water inlet pipe is a water outlet end. The upper section of the water inlet pipe is sealed and inserted into the connecting hole on the bottom surface of the bottom end of the T-shaped cavity, and the water outlet end of the water inlet pipe extends to the top of the T-shaped cavity and forms a water outlet gap with the top surface of the T-shaped cavity.

[0016] The beneficial effects of this invention are as follows: By setting a reactor guide tank in the upper section of the reactor, the reagent can quickly enter the main reaction zone of the reactor along the guide tank, mix thoroughly with the influent, and react rapidly to produce crystals. The influent is evenly distributed using a water distributor, and the reagent is evenly distributed through a funnel-shaped opening at the lower end of the reactor guide tank, ensuring that the wastewater and reagent are dispersed and evenly mixed, resulting in a thorough reaction and promoting rapid crystal growth. This application also sets up return water outlets arranged vertically on the reactor shell, guiding the return water into the dosing buffer zone of the reactor guide tank to mix with the reagent, and then quickly entering the main reaction zone of the reactor along the dosing mixing port of the reactor guide tank. Medium and small crystals located in the upper section of the reactor will return to the dosing buffer zone with the return water through the circulation pipe to continue to mix with the influent and continue to grow. The large crystals produced by the reaction settle at the bottom of the reactor and are discharged through the crystal discharge port, which helps to ensure that the crystal particles discharged from the crystal discharge port are large particles, thus ensuring the quality of the crystal product. Attached Figure Description

[0017] Figure 1 This is a three-dimensional diagram illustrating the structural principle of the present invention;

[0018] Figure 2 This is a front view illustrating the structural principle of the present invention;

[0019] Figure 3 This is a perspective view of the reactor guide tube of the present invention;

[0020] Figure 4 This is an exploded perspective view of the water distributor of the present invention;

[0021] Figure 5This is a perspective view of the T-shaped water distribution head of the present invention;

[0022] Figure 6 This is a front view of the T-shaped water distribution head of the present invention;

[0023] Figure 7 This is a bottom view of the T-shaped water distribution head of the present invention;

[0024] Figure 8 This is a schematic diagram of the structural principle of the present invention. Detailed Implementation

[0025] Example: A mixed fluidized bed reactor includes a reactor shell 1, a water distributor 2, and a dosing pipe 21. The reactor shell 1 has an inlet 3 and a crystal discharge port 4 on its lower side wall, and an outlet 5 on its upper side wall. The water distributor 2 is fixedly installed at the bottom inner side of the reactor shell 1 and is connected to the inlet 3 on the lower side wall of the reactor shell 1. The reactor also includes a reactor guide barrel 6, which is fixedly installed inside the upper section of the reactor shell 1. The lower end of the reactor guide barrel 6 forms a dosing and mixing port 7. The area between the lower end of the reactor guide barrel 6 and the bottom inner side of the reactor shell 1 is the main reaction zone of the reactor. The dosing pipe 21 extends from top to bottom into the upper part of the reactor guide barrel 6, allowing the reagent to flow from top to bottom along the reactor guide barrel 6 and into the main reaction zone of the reactor through the dosing and mixing port 7 to crystallize with the wastewater.

[0026] Water enters the reactor through the inlet 3 at the bottom of the reactor shell. Under the action of the water distributor 2, it enters the main reaction zone of the reactor evenly. The dosing pipe 21 goes directly into the upper part of the reactor guide tube 6 through an elbow. The outlet height of the dosing pipe 21 is lower than the upper edge of the reactor guide tube 6. The reactor adds chemicals to the upper part of the reactor guide tube 6 through the dosing pipe 21. The chemicals mix with the wastewater in the reactor guide tube 6 and flow downward. Finally, they enter the main reaction zone through the dosing mixing port 7 at the lower end of the reactor guide tube 6 and fully mix with the water to react. The large crystals after the reaction are discharged through the crystal discharge port 4. The supernatant after the reaction is fully completed is discharged from the outlet 5. The above reactor can directly and quickly deliver the chemicals to the main reaction zone, so that the chemicals and the water can fully react in the main reaction zone and prevent the chemicals from being carried away by the effluent.

[0027] The upper end of the reactor guide tank 6 forms a barrel-shaped dosing buffer zone 8. Between the dosing buffer zone 8 and the dosing mixing port 7, the reactor guide tank 6 also has a cylindrical guide column 9. The upper end of the guide column 9 is connected to the lower end of the dosing buffer zone 8, and the lower end of the guide column 9 is connected to the upper end of the dosing mixing port 7. The radial dimension of the guide column 9 is smaller than the radial dimension of the dosing buffer zone 8. The dosing mixing port 7 has a funnel-shaped structure with a smaller upper radial dimension than a smaller lower radial dimension. The diameter of the guide column 9 is smaller than the diameter of the dosing buffer zone 8, extending downwards in a slender structure so that the uniformly mixed reagent can flow downwards at a relatively fast speed and quickly reach the main reaction zone. The reagent finally flows downwards uniformly along the funnel-shaped dosing mixing port 7 in a diffused state, achieving uniform and thorough mixing with the wastewater in the main reaction zone. This prevents the crystallization reaction from concentrating in the middle area of ​​the main reaction zone, ensuring that the wastewater at the edges of the main reaction zone also fully participates in the crystallization reaction.

[0028] The reactor guide tube 6 is located in the center of the upper section of the reactor shell 1, and the height of the upper end of the reactor guide tube 6 is not lower than the height of the water outlet 5 on the reactor shell 1. In this way, the liquid level inside the reactor shell is lower than the height of the upper edge of the reactor guide tube 6, ensuring that all the reagent flows downward along the reactor guide tube 6 into the main reaction zone, and preventing the reagent from overflowing from the upper opening of the reactor guide tube 6 and being discharged from the water outlet 5.

[0029] The reactor shell 1 has a circular cross-section, the dosing buffer zone 8 of the reactor guide tank 6 is a cylindrical structure without a top, the guide column 9 of the reactor guide tank 6 is a slender cylindrical structure, and the dosing mixing port 7 of the reactor guide tank 6 is a truncated conical structure. The reactor guide tank 6 and the reactor shell 1 are coaxially aligned to ensure that the reagent and wastewater are fully and evenly mixed and react comprehensively.

[0030] The reactor shell 1 has at least one reflux outlet 5 on its side wall, and the dosing buffer zone 8 of the reactor guide tank 6 has a reflux inlet 3 on its side wall. Each reflux outlet 5 is connected to the reflux inlet 3 through a reflux pipe 23. A circulation pump 22 is also provided, which can pump the reflux water from the reflux outlet 5 into the reflux inlet 3. The reflux water and the reagent can be mixed in the reactor guide tank 6 and then discharged into the main reaction zone of the reactor through the dosing mixing port 7. The reagent is fully mixed with the reflux water in the dosing buffer zone 8. After being mixed evenly, it flows down along the guide column 9 into the main reaction zone to crystallize with the incoming water. The reacted liquid then returns to the dosing buffer zone 8 of the reactor guide tank 6 through the reflux pipe 23 to continue mixing and diluting with the incoming reagent, so that the small crystals mixed in the reflux water continue to grow on the surface until they grow into large crystals. The large crystals sink to the bottom of the reactor and are discharged from the crystal discharge port 4.

[0031] The reactor shell 1 has three reflux outlets 5 arranged from top to bottom on its side wall: an ultrafine crystal reflux outlet 1110, a fine crystal reflux outlet 11, and a medium crystal reflux outlet 12. These three reflux outlets 5 are located in the area between the drain outlet and the crystal discharge outlet 4 on the reactor shell 1. Each of the three reflux outlets 5 is equipped with an electromagnetic switch, which controls the opening and closing of each reflux outlet 5. The three reflux outlets 5 are connected to a circulation pump 22 via pipes. The opening and closing of any reflux outlet 5 can be controlled by the circulation pump 22 and the electromagnetic switches. The opening and closing states of the three reflux outlets 5 are independent of each other, allowing for arbitrary adjustment of the crystal particle size participating in the circulation process.

[0032] The height of the return water inlet 3 on the upper side wall of the reactor guide tank 6 is lower than the height of the water outlet 5 on the side wall of the reactor shell 1 and the outlet of the dosing pipe 21. This ensures that the reagent can smoothly enter the reactor guide tank 6 and mix rapidly with the return water.

[0033] The reactor shell 1 is also provided with a reflux inlet 13, which is connected to the reflux inlet 3 on the upper side wall of the reactor guide tank 6 via a pipe. The inlet 3, crystal discharge port 4, outlet 5, reflux outlet 5, and reflux inlet 13 on the reactor shell 1 are respectively provided with flange connections for connecting the inlet pipe 18, the crystal discharge pipe, the outlet pipe, and the reflux pipe 23. By providing multiple flange connections on the reactor shell 1 for connecting pipes, quick pipe connection is facilitated. The height of the flange connection on the reflux inlet 13 is lower than the height of the flange connection on the outlet 5.

[0034] A water distribution plate 14 is fixedly installed on the inner side of the lower end of the reactor shell 1, forming a water inlet cavity 15 between the water distribution plate 14 and the bottom surface of the lower end of the reactor shell 1. The water inlet 3 on the side wall of the reactor shell 1 communicates with the water inlet cavity 15. The water distribution plate 14 is provided with a plurality of evenly spaced distribution holes 16, and a T-shaped water distribution head 17 is installed on each distribution hole 16. Wastewater in the water inlet cavity 15 can be evenly distributed to the main reaction zone of the reactor through each T-shaped water distribution head 17. Wastewater enters the water inlet cavity 15 at the bottom of the reactor from the water inlet 3, and then is evenly distributed upward along each T-shaped water distribution head 17, so that the wastewater is evenly distributed to the main reaction zone of the reactor.

[0035] The T-shaped water distribution head 17 includes a column-shaped inlet pipe 18 and a T-shaped cavity 19. The top surface of the T-shaped cavity 19 is sealed, and a connecting hole is formed in the middle of the bottom surface of the bottom end. A plurality of strip-shaped water distribution holes 20 are evenly spaced around the connecting hole. The plurality of strip-shaped water distribution holes 20 extend radially along the bottom surface of the bottom end of the T-shaped cavity. The inlet pipe 18 is open at both the top and bottom. The lower end of the inlet pipe 18 is the inlet end that is sealed and connected to the distribution hole 16 of the water distribution plate 14. The upper end of the inlet pipe 18 is the outlet end. The upper section of the inlet pipe 18 is sealed and inserted into the connecting hole on the bottom surface of the bottom end of the T-shaped cavity 19. The outlet end of the inlet pipe 18 extends to the top of the T-shaped cavity 19 and forms an outlet gap with the top surface of the T-shaped cavity. After the wastewater enters the inlet pipe 18 of the T-shaped water distribution head 17, it flows upward and impacts the top surface of the T-shaped cavity 19 before flowing outward into the annular area formed between the outside of the inlet pipe 18 and the T-shaped cavity. Then, it flows downward along the strip-shaped water distribution hole 20. This prevents the wastewater from rushing upward and reaching the top of the reactor before it has fully reacted. Furthermore, the impact of the wastewater into the T-shaped cavity 19 on the top surface of the T-shaped cavity 19 can knock down particles in the wastewater and prevent them from clogging the strip-shaped water distribution hole 20. The T-shaped cavity 19 is preferably a frustum-shaped cavity structure with the upper end smaller than the lower end, and its inclined outer surface acts as a guide for the outflow of water.

Claims

1. A mixed fluidized bed reactor, comprising a reactor shell (1), a water distributor (2), and a dosing pipe (21), wherein an inlet (3) and a crystal discharge port (4) are provided on the lower side wall of the reactor shell, and an outlet (5) is provided on the upper side wall of the reactor shell, characterized in that: The water distributor is fixedly installed at the bottom inside the reactor shell. The water distributor is connected to the water inlet on the lower side wall of the reactor shell. It also includes a reactor guide barrel (6). The reactor guide barrel is fixedly installed inside the upper section of the reactor shell. The lower end of the reactor guide barrel forms a dosing and mixing port (7). The area between the lower end of the reactor guide barrel and the bottom surface inside the reactor shell is the main reaction zone of the reactor. The dosing pipe extends from top to bottom into the upper end of the reactor guide barrel. The agent can flow from top to bottom along the reactor guide barrel and flow into the main reaction zone of the reactor along the dosing and mixing port of the reactor guide barrel to crystallize with the wastewater.

2. The mixed fluidized bed reactor according to claim 1, characterized in that: The upper end of the reactor guide barrel forms a barrel-shaped dosing buffer zone (8). The reactor guide barrel is also provided with a cylindrical guide column (9) between the dosing buffer zone and the dosing mixing port. The upper end of the guide column is connected to the lower end of the dosing buffer zone, and the lower end of the guide column is connected to the upper end of the dosing mixing port. The radial dimension of the guide column is smaller than the radial dimension of the dosing buffer zone. The dosing mixing port is a funnel-shaped structure with a radial dimension at the upper end smaller than that at the lower end.

3. The mixed fluidized bed reactor according to claim 2, characterized in that: The reactor guide tube is located in the center of the upper section of the reactor shell, and the height of the upper end of the reactor guide tube is not lower than the height of the water outlet on the reactor shell.

4. The mixed fluidized bed reactor according to claim 2 or 3, characterized in that: The reactor shell has a circular cross-section, the dosing buffer zone of the reactor guide barrel is a cylindrical structure without a top, the guide column of the reactor guide barrel is a slender cylindrical structure, and the dosing mixing port of the reactor guide barrel is a truncated conical structure.

5. The mixed fluidized bed reactor according to claim 2, characterized in that: The reactor shell has at least one reflux outlet on its side wall and a reflux inlet on the side wall of the dosing buffer zone of the reactor guide barrel. Each reflux outlet is connected to the reflux inlet through a reflux pipe (23). A circulation pump (22) is also provided. The circulation pump can pump the reflux water from the reflux outlet into the reflux inlet. The reflux water and the reagent can be mixed in the reactor guide barrel and then discharged to the main reaction zone of the reactor through the dosing mixing port.

6. The mixed fluidized bed reactor according to claim 5, characterized in that: The reactor shell has three reflux outlets arranged from top to bottom on its side wall: ultrafine crystal reflux outlet (10), fine crystal reflux outlet (11), and medium crystal reflux outlet (12). The three reflux outlets are located in the area between the drain outlet and the crystal discharge outlet on the reactor shell. Each of the three reflux outlets is equipped with an electromagnetic switch, and each electromagnetic switch controls the opening and closing of each reflux outlet.

7. The mixed fluidized bed reactor according to claim 5, characterized in that: The height of the reflux inlet on the upper side wall of the reactor guide tube is lower than the height of the outlet on the side wall of the reactor shell and the outlet of the dosing pipe.

8. The mixed fluidized bed reactor according to claim 5, characterized in that: The reactor shell is also provided with a reflux inlet (13), which is connected to the reflux inlet on the upper side wall of the reactor guide barrel through a pipe. The inlet, crystal discharge port, outlet, reflux outlet and reflux inlet on the reactor shell are respectively provided with flange connection ports for connecting the inlet pipe, crystal discharge pipe, outlet pipe and reflux pipe.

9. The mixed fluidized bed reactor according to claim 1, characterized in that: A water distribution plate (14) is fixedly installed on the inner side of the lower end of the reactor shell. A water inlet cavity (15) is formed between the water distribution plate and the bottom surface of the lower end of the reactor shell. The water inlet on the side wall of the reactor shell is connected to the water inlet cavity. A number of distribution holes (16) are evenly spaced on the water distribution plate. A T-shaped water distribution head (17) is installed on each distribution hole. Wastewater in the water inlet cavity can be evenly distributed to the main reaction zone of the reactor through each T-shaped water distribution head.

10. The mixed fluidized bed reactor according to claim 9, characterized in that: The T-shaped water distribution head includes a water inlet pipe (18) of a column and a T-shaped cavity (19). The top surface of the T-shaped cavity is sealed, and a connecting hole is formed in the middle of the bottom surface of the bottom end. Several strip-shaped water distribution holes (20) are evenly spaced around the connecting hole. The strip-shaped water distribution holes extend radially along the bottom surface of the bottom end of the T-shaped cavity. The water inlet pipe is open at both the top and bottom. The bottom end of the water inlet pipe is the water inlet end that is sealed and connected to the distribution hole of the water distribution plate. The top end of the water inlet pipe is the water outlet end. The upper section of the water inlet pipe is sealed and inserted into the connecting hole on the bottom surface of the bottom end of the T-shaped cavity. The water outlet end of the water inlet pipe extends to the top of the T-shaped cavity and forms a water outlet gap with the top surface of the T-shaped cavity.

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