Mechanical stirring type fluidized bed crystallization reactor

Abstract

The utility model discloses a mechanical stirring type fluidized bed crystallization reactor, which comprises a reactor shell, a waste water supply device and a precipitant supply device, a water outlet is arranged at the upper end of the reactor shell, a crystal outlet is arranged at the lower end of the reactor shell, and a water inlet and a medicine inlet are arranged on the side wall of the reactor shell. The wastewater supply device and the precipitant supply device can respectively feed wastewater and a precipitant into the reaction area in the reactor shell through the water inlet and the medicine inlet, the driving motor is fixedly mounted on the reactor shell, a stirring part of the homogeneous stirrer is rotatably arranged in the reaction area of the reactor shell, and the driving motor is fixedly mounted on the reactor shell. The driving motor can drive the stirring part of the homogeneous stirrer to rotate, and the stirring part of the homogeneous stirrer can stir a mixture in the reaction area of the reactor shell, so that the waste water and the crystal mixture generate up-down convection in the reaction area, the fluidization effect at the bottom of a crystal bed layer can be effectively improved, and the crystallization load is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a mechanical stirring fluidized bed crystallization reactor. Background Art

[0002] The application of a fluidized bed induced crystallization reactor in sewage resource utilization generally refers to introducing wastewater and corresponding precipitants into a reactor containing crystal seeds, and the cations and anions are completely mixed with each other by hydraulic force. When the activity product of the cations and anions reaches the metastable zone, they begin to precipitate from the liquid phase and become crystals. Once the hydraulic mixing is uneven and the activity product of the cations and anions is in the supersaturated zone, secondary nucleation occurs in the reaction zone, resulting in a decrease in the crystallization rate. Therefore, the hydraulic force in the reactor has a greater impact on the supersaturation of the cations and anions.

[0003] Due to the gravitational force of the crystals in the bed layer, the particle size of the crystals in the fluidized bed is regularly from large to small from bottom to top. Therefore, the fluidization state of the crystals is also getting better from the bottom to the top of the bed layer. Poor mass transfer effect at the bottom of the bed layer will lead to poor crystallization rate at the bottom, which is a common problem of traditional fluidized bed reactors that completely rely on hydraulic force as the mass transfer driving force.

[0004] To achieve non-accumulation of particles and uniform mixing of cations and anions, very high requirements are imposed on the magnitude and distribution of the hydraulic force. Once particle accumulation occurs in a certain area, it is easy to produce a vicious cycle, leading to a complete deterioration of the flow pattern. Summary of the Utility Model

[0005] In order to overcome the above defects, the utility model provides a mechanical stirring fluidized bed crystallization reactor, which can effectively improve the fluidization effect at the bottom of the crystal bed layer, has better mass transfer, and the effect is continuous and stable.

[0006] The technical solution adopted by the utility model to solve its technical problems: a mechanical stirring fluidized bed crystallization reactor, including a reactor shell, a wastewater supply device and a precipitant supply device. A drain port is provided at the upper end of the reactor shell, a crystal discharge port is provided at the lower end of the reactor shell, a water inlet and a chemical inlet are provided on the side wall of the reactor shell. The wastewater supply device and the precipitant supply device can respectively send wastewater and precipitant into the reaction zone in the reactor shell through the water inlet and the chemical inlet. A homogeneous stirrer and a driving motor are also provided. The driving motor is fixedly installed on the reactor shell, and the stirring part of the homogeneous stirrer is rotatably arranged in the reaction zone of the reactor shell. The driving motor can drive the stirring part of the homogeneous stirrer to rotate. The stirring part of the homogeneous stirrer can stir the mixture in the reaction zone of the reactor shell, so that the mixture of wastewater and crystals generates up and down convection in the reaction zone.

[0007] A homogeneous stirrer is arranged inside the fluidized bed crystallization reactor. The stirring part of the homogeneous stirrer stirs the wastewater and crystal mixture inside the reactor shell. On the one hand, it enables the wastewater and the precipitant to be fully mixed, making the cations and anions in the influent and the added medicine instantaneously and uniformly dispersed, effectively improving the crystallization rate. On the other hand, it makes the liquid and crystal mixture inside the reactor form an up-and-down convection state, preventing particle accumulation and greatly improving the crystallization load.

[0008] As a further improvement of the present utility model, two or more water inlets are arranged at intervals in the vertical direction on the side wall of the reactor shell, and at least one medicine inlet is clamped between two adjacent water inlets in the vertical direction. This way of water inlet and medicine inlet is conducive to the full mixing of the wastewater and the precipitant, conducive to accelerating the crystallization reaction, and preventing secondary nucleation in the reaction zone.

[0009] As a further improvement of the present utility model, an annular water distributor and an annular medicine distributor are also arranged inside the reactor shell; the annular water distributor includes a main water distribution pipe and an annular water distribution pipe, the annular water distribution pipe is concentrically and fixedly installed inside the reactor shell, one end of the main water distribution pipe is communicated with the annular water distribution pipe, the other end of the main water distribution pipe seals and passes through the water inlet on the side wall of the reactor shell and is communicated with the wastewater supply device, and a plurality of water distribution holes for the wastewater inside it to enter the inside of the reactor shell are evenly arranged at intervals on the annular water distribution pipe; the annular medicine distributor includes a main medicine distribution pipe and an annular medicine distribution pipe, the annular medicine distribution pipe is concentrically and fixedly installed inside the reactor shell, one end of the main medicine distribution pipe is communicated with the annular medicine distribution pipe, the other end of the main medicine distribution pipe seals and passes through the medicine inlet on the side wall of the reactor shell and is communicated with the precipitant supply device, and a plurality of medicine distribution holes for the precipitant inside it to enter the inside of the reactor shell are evenly arranged at intervals on the annular medicine distribution pipe. The water inlet and the medicine inlet respectively realize uniform water distribution and uniform medicine distribution through the annular water distributor and the annular medicine distributor, further improving the full mixing of the wastewater and the precipitant and improving the crystallization efficiency.

[0010] As a further improvement of the present utility model, the diameter of the annular water distributor is larger than that of the annular medicine distributor, and the annular medicine distributor is clamped between two annular water distributors at equal intervals in the vertical direction. In this way, the precipitant is evenly coated in the middle of the wastewater, which is conducive to comprehensive mixing and improving the reaction efficiency.

[0011] As a further improvement of the present utility model, a T-shaped water distribution head is fixedly installed on the water distribution holes of the annular water distribution pipe, and a T-shaped medicine distribution head is fixedly installed on the medicine distribution holes of the annular medicine distribution pipe. The size of the T-shaped water distribution head is larger than that of the T-shaped medicine distribution head. The smaller-diameter ends of the T-shaped water distribution head and the T-shaped medicine distribution head are respectively in sealed communication with the annular water distribution pipe and the annular medicine distribution pipe. The larger-diameter ends of the T-shaped water distribution head and the T-shaped medicine distribution head are respectively provided with a plurality of evenly distributed water dispersion holes and medicine dispersion holes. The number of water dispersion holes on the T-shaped water distribution head is more than the number of medicine dispersion holes on the T-shaped medicine distribution head. The T-shaped water distribution head on the upper-layer annular water distribution pipe is preferably used for downward water dispersion, and the T-shaped water distribution head on the lower-layer annular water distribution pipe is preferably used for upward water dispersion. The T-shaped medicine distribution head can distribute medicine in two directions. In addition, the T-shaped water distribution heads on the upper layer and the lower layer can also both face upward or both face downward for water dispersion, and the T-shaped medicine distribution head can also distribute water unidirectionally upward or unidirectionally downward.

[0012] As a further improvement of the present utility model, the homogeneous stirrer includes a stirring shaft and stirring fans. The stirring shaft extends in the up-and-down direction and is coaxially arranged in the reactor housing. Four layers of stirring fans are fixedly installed on the stirring shaft in an up-and-down arrangement. The stirring fans of each layer are parallel to each other and arranged at equal intervals. Each layer of stirring fans includes a plurality of fan blades arranged at equal intervals along the circumferential direction of the stirring shaft on the same horizontal plane. The multi-layer stirring fans can fully stir the liquid and crystal mixture in the reaction zone of the reactor housing to form an obvious up-and-down convection effect.

[0013] As a further improvement of the present utility model, the stirring fans of each layer of the homogeneous stirrer and each annular water distributor and annular medicine distributor are arranged in a staggered manner at equal intervals in the up-and-down direction. In the reactor, from bottom to top, there are: stirring fans, the lower-layer water distributor, stirring fans, medicine distributor, stirring fans, the upper-side water distributor, stirring fans. This kind of arrangement enables the waste water and the precipitant to be fully stirred and evenly mixed, and at the same time enables the liquid and crystals in the entire reaction zone to form continuous up-and-down convection, avoiding particle accumulation and realizing efficient crystallization.

[0014] As a further improvement of the present utility model, the shape of the stirring fan is a toothed plate type, paddle type, turbine type, anchor type, frame type, screw ribbon type, screw type, Blumagin type or propeller type.

[0015] As a further improvement of the present utility model, the shape of the stirring fan is paddle type. Hyperboloid structures are formed both below and above the stirring fan blades. The hyperboloid structure below the fan blades can make the mixture of waste water and crystals in the reaction zone have an upward flow state, and the hyperboloid structure above the fan blades can make the mixture of waste water and crystals in the reaction zone have a downward flow state. This kind of fan blade is more conducive to the up-and-down convection of the liquid and crystals in the reaction zone and improves the crystallization rate.

[0016] As a further improvement of the present utility model, the lower end of the reactor housing forms a conical bottom, the crystal discharge port is arranged at the middle part with the lowest height of the conical bottom, a valve is arranged in the crystal discharge port, the upper end of the reactor housing forms a frustum-shaped water outlet area with the upper end size larger than the lower end size, and the drain port is arranged on the upper side wall of the frustum-shaped water outlet area.

[0017] The beneficial effects of the present utility model are as follows: by arranging a mechanical stirrer in the fluidized bed crystallization reactor, the mechanical stirrer fully mixes the wastewater and the precipitant in the reaction area of the fluidized bed crystallization reactor, which can effectively improve the fluidization effect at the bottom of the crystal bed layer, making the mass transfer better, the effect continuous and stable. And by adopting an annular water distributor and an annular chemical distributor for uniform water distribution and chemical distribution, and arranging multiple layers of water distributors to distribute water on both sides of the chemical distributor, and then stirring by the fan blades arranged crosswise in the height direction, the cations and anions in the wastewater and the precipitant are instantaneously and uniformly dispersed, and the stirring fan blades make the mixture of the wastewater and the crystals form a convection state in the up and down directions, greatly improving the crystallization load. The present utility model can also adjust the stirring speed at any time to meet the requirements of different mixing states to satisfy the mixing requirements under different crystal particle sizes and different load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural principle diagram of the present utility model;

[0019] Figure 2 is a front view of the structural principle of the present utility model;

[0020] Figure 3 is a top view of the structural principle of the present utility model;

[0021] Figure 4 is a three-dimensional diagram of the reactor housing of the present utility model;

[0022] Figure 5 is a three-dimensional diagram of the mechanical stirrer of the present utility model;

[0023] Figure 6 is a three-dimensional diagram of the stirring fan of the mechanical stirrer;

[0024] Figure 7 is a three-dimensional exploded view of the water distributor of the present utility model;

[0025] Figure 8 is a three-dimensional diagram of the T-shaped water head of the present utility model;

[0026] Figure 9 is a three-dimensional exploded view of the chemical distributor of the present utility model;

[0027] Figure 10 is a three-dimensional diagram of the T-shaped chemical head of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0028] Embodiment: A mechanically stirred fluidized bed crystallization reactor, comprising a reactor housing 10, an annular water distributor 20, an annular chemical distributor 30, and a homogeneous stirrer 40. A drain port 11 is provided at the upper end of the reactor housing 10, and a water inlet 13 and a chemical inlet 14 are provided on the side wall of the reactor housing. The annular water distributor and the annular chemical distributor 30 are respectively arranged inside the lower section of the reaction zone of the reactor housing 10. The annular water distributor can supply wastewater to the reaction zone inside the reactor housing 10, and the annular chemical distributor 30 can supply a precipitant to the reaction zone inside the reactor housing 10. The homogeneous stirrer 40 is fixedly installed on the reactor housing 10. The stirring shaft 41 of the homogeneous stirrer 40 is rotatably inserted into the reactor housing 10 and is concentric with the stirrer housing. Four layers of stirring fans 42 are arranged at intervals up and down on the stirring shaft 41 of the homogeneous stirrer 40, and each layer of stirring fans 42 is located at the exact center of the reactor housing 10. A conical bottom 15 is formed at the lower end of the reactor housing 10, and a crystal discharge port 12 is provided at the tip of the bottom of the conical bottom 15. After the crystal particles reach a larger particle size, the crystals are discharged from the crystal discharge port 12 by opening the valve inside the crystal discharge port 12.

[0029] The annular water distributor inside the reactor housing 10 extends horizontally, and two layers of annular water distributors 20 are arranged at intervals up and down. The annular chemical distributor 30 is in the middle of the two layers of annular water distributors. The annular water distributor includes a main water distribution pipe 22, an annular water distribution pipe 23, and a T-shaped water head 21. The main water distribution pipe 22 passes through the reactor housing 10 and is connected to the water inlet pipe of the wastewater supply device. The water first flows into the main water distribution pipe 22, then into the annular water distribution pipe 23, and finally enters the reactor housing 10 through the T-shaped water head 21. The annular chemical distributor 30 includes a main chemical distribution pipe 32, an annular chemical distribution pipe 33, and a T-shaped chemical head 31. The main chemical distribution pipe 32 passes through the reactor housing 10 and is connected to the chemical addition pipe of the precipitant supply device. The chemical first flows into the main chemical distribution pipe 32, then into the annular chemical distribution pipe 33, and finally enters the reactor housing 10 through the T-shaped chemical head 31. The diameter of the ring of the annular water distribution pipe 23 of the annular water distributor is larger than the diameter of the ring of the annular chemical distribution pipe 33 of the annular chemical distributor. The centers of the rings of the annular water distributor and the annular chemical distributor 30 are located on the central axis of the reactor housing 10. The size of the T-shaped water head 21 is larger than the size of the T-shaped chemical head 31, and the number of water dispersion holes 211 of the T-shaped water head 21 is more than the number of chemical dispersion holes 311 of the T-shaped chemical head 31.

[0030] The stirring fans 42 of the homogeneous stirrer 40 are arranged in four layers at intervals in the vertical direction. The stirring fans 42 of each layer are parallel to each other at equal intervals and perpendicular to the stirring shaft 41. The rotational power of the fan blades 421 of the stirring fans 42 of each layer is forced by a motor. The shape of the fan blades 421 of the stirring fans 42 is preferably paddle-shaped. The flow state with the hyperbolic surface facing upward is below the fan blades 421 of the stirring fans 42, and the flow state with the hyperbolic surface facing downward is above the fan blades 421 of the stirring fans 42, realizing the forced mixing of the up-and-down convection of water and crystals.

Claims

1. A mechanical stirring fluidized bed crystallization reactor, comprising a reactor shell (10), a waste water supply device and a precipitant supply device. A drain port (11) is provided at the upper end of the reactor shell, a crystal discharge port (12) is provided at the lower end of the reactor shell, a water inlet (13) and a chemical inlet (14) are provided on the side wall of the reactor shell. The waste water supply device and the precipitant supply device can respectively send waste water and precipitant into the reaction zone in the reactor shell through the water inlet and the chemical inlet. It is characterized in that: A homogeneous stirrer (40) and a driving motor are also provided. The driving motor is fixedly installed on the reactor shell, and the stirring part of the homogeneous stirrer is rotatably arranged in the reaction area of the reactor shell. The driving motor can drive the stirring part of the homogeneous stirrer to rotate, and the stirring part of the homogeneous stirrer can stir the mixture in the reaction area of the reactor shell, so that the wastewater and crystal mixture generate up-and-down convection in the reaction area.

2. The mechanical stirring fluidized bed crystallization reactor according to claim 1, wherein: Two or more water inlets are arranged at intervals in the up-and-down direction on the side wall of the reactor shell, and at least one chemical inlet is clamped between two adjacent water inlets in the up-and-down direction.

3. The mechanical stirring fluidized bed crystallization reactor according to claim 2, wherein: An annular water distributor (20) and an annular chemical distributor (30) are also provided in the reactor shell; the annular water distributor includes a main water distribution pipe (22) and an annular water distribution pipe (23), the annular water distribution pipe is concentrically and fixedly installed inside the reactor shell, one end of the main water distribution pipe is communicated with the annular water distribution pipe, the other end of the main water distribution pipe seals through the water inlet on the side wall of the reactor shell and is communicated with the wastewater supply device, and a number of water distribution holes (24) for the wastewater inside it to enter the inside of the reactor shell are evenly spaced on the annular water distribution pipe; the annular chemical distributor includes a main chemical distribution pipe (32) and an annular chemical distribution pipe (33), the annular chemical distribution pipe is concentrically and fixedly installed inside the reactor shell, one end of the main chemical distribution pipe is communicated with the annular chemical distribution pipe, the other end of the main chemical distribution pipe seals through the chemical inlet on the side wall of the reactor shell and is communicated with the precipitant supply device, and a number of chemical distribution holes (34) for the precipitant inside it to enter the inside of the reactor shell are evenly spaced on the annular chemical distribution pipe.

4. The mechanical agitation fluidized bed crystallization reactor according to claim 3, wherein: The diameter of the annular water distributor is larger than that of the annular chemical distributor, and the annular chemical distributor is evenly spaced and clamped between two annular water distributors in the up-and-down direction.

5. The mechanical stirring fluidized bed crystallization reactor according to claim 3, characterized in that: A T-shaped water head (21) is fixedly installed on the water distribution hole of the annular water distribution pipe, and a T-shaped chemical head (31) is fixedly installed on the chemical distribution hole of the annular chemical distribution pipe. The size of the T-shaped water head is larger than that of the T-shaped chemical head. The smaller diameter ends of the T-shaped water head and the T-shaped chemical head are respectively sealed and communicated with the annular water distribution pipe and the annular chemical distribution pipe, and a number of evenly distributed water dispersion holes (211) and chemical dispersion holes (311) are respectively arranged at the larger diameter ends of the T-shaped water head and the T-shaped chemical head. The number of water dispersion holes on the T-shaped water head is more than that of the chemical dispersion holes on the T-shaped chemical head.

6. The mechanical stirring fluidized bed crystallization reactor according to claim 3, wherein: The homogeneous stirrer includes a stirring shaft (41) and stirring fans (42). The stirring shaft extends in the up-and-down direction and is coaxially arranged inside the reactor shell. Four layers of stirring fans arranged in the up-and-down direction are fixedly installed on the stirring shaft. Each layer of stirring fans is parallel to each other and evenly spaced. Each layer of stirring fans includes a number of fan blades (421) evenly spaced along the circumferential direction of the stirring shaft on the same horizontal plane.

7. The mechanical stirring fluidized bed crystallization reactor according to claim 6, characterized in that: Each layer of stirring fans of the homogeneous stirrer and each annular water distributor and annular chemical distributor are evenly spaced and cross-arranged in the up-and-down direction.

8. The mechanical stirring fluidized bed crystallization reactor according to claim 6, wherein: The shape of the stirring fan is tooth type, paddle type, turbine type, anchor type, frame type, screw ribbon type, screw type, Blumagin type or propeller type.

9. The mechanical stirring fluidized bed crystallization reactor according to claim 8, characterized in that: The stirring fan is in the shape of a paddle, and hyperbolic structures are formed both below and above the stirring fan blades. The hyperbolic structure below the fan blades can make the mixture of wastewater and crystals in the reaction zone have an upward flow state, and the hyperbolic structure above the fan blades can make the mixture of wastewater and crystals in the reaction zone have a downward flow state.

10. The mechanical stirring fluidized bed crystallization reactor according to claim 1, wherein: The lower end of the reactor shell forms a conical bottom (15), and the crystal discharge port is arranged at the middle part with the lowest height of the conical bottom. A valve is provided in the crystal discharge port. The upper end of the reactor shell forms a frustum-shaped water outlet area (16) with an upper end size larger than the lower end size, and the drain port is arranged on the side wall at the upper end of the frustum-shaped water outlet area.

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