A multi-directional stirring and temperature-controlled monomer premixing device

Abstract

The utility model discloses a kind of monomer premixing equipment of multidirectional stirring and temperature joint control, including tank body, axial stirring device, radial stirring device, first condenser, second condenser and third condenser, axial mixing and radial mixing mode are used in the utility model to multidirectional stirring, so it can promote the full circulation of monomer in tank body, to improve mixing effect, under the action of fairing and helical blade monomer will form internal and external circulation mixing, distribution tray can avoid monomer laminar flow along the outer wall of fairing upwards, to enter the shear mixing area of rectangular blade, improve mixing degree. Temperature is used in the utility model and is controlled in section, according to the corresponding control temperature of heat production point setting, only need to ensure that the temperature of each cycle section is slightly lower than safety threshold value, the heat absorption capacity to external world is at low level, so it can greatly reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a monomer premixing device with multi-directional stirring and temperature control. Background Technology

[0002] In the chemical or materials fields, the uniformity and temperature stability of monomer mixing directly affect the quality of subsequent polymerization reactions. Some high-viscosity fluids or solid-containing systems are prone to sedimentation during traditional unidirectional stirring, resulting in dead zones and uneven mixing. During stirring, monomers are subjected to shearing motion and other effects, causing the temperature to rise. Some monomer systems are more sensitive to exothermic reactions. If the temperature is not well controlled during stirring, it can cause monomer denaturation and other adverse conditions, which can easily affect the final polymerization reaction. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a monomer premixing device with multi-directional stirring and temperature control, thereby solving the technical problems in the background art mentioned above.

[0004] The technical solution of this utility model is as follows:

[0005] A multi-directional stirring and temperature-controlled monomer premixing device includes a tank. A stirring shaft connected to a drive device is installed at the center of the tank. A propeller blade is mounted on the stirring shaft, and a flow guide is installed around the propeller blade. A liquid distribution plate is installed on the stirring shaft near the bottom of the tank. Several radially welded crank arms are attached to the peripheral wall of the liquid distribution plate, and rectangular propeller blades are fixed to the vertical portions of the crank arms. A first condenser is fixed to the inner wall of the flow guide, and a second and third condenser are arranged on the peripheral wall of the tank. The first condenser is located within the height range of the rectangular propeller blades, and the second condenser is located above the first condenser but below the inlet height of the flow guide. A temperature probe A is installed on the outlet side of the inner wall of the flow guide for feedback control of the first condenser, a temperature probe B is installed above the first condenser for feedback control of the second condenser, and a temperature probe C is installed above the third condenser for feedback control of the third condenser.

[0006] Furthermore, the first condenser is a coil fixed to the inner wall of the flow guide shroud, while the second and third condensers are heat exchange jackets fixed to the outer peripheral wall of the tank and are all connected to the refrigerant system. Temperature control is achieved by adjusting the refrigerant flow rate in the first, second, and third condensers respectively.

[0007] Furthermore, it also includes a PID controller, wherein temperature probe A, temperature probe B, and temperature probe C are all connected to the PID controller, and the PID controller is connected to the circulation pumps on the refrigerant circulation pipelines of the first condenser, the second condenser, and the third condenser, respectively.

[0008] Furthermore, the top of the tank is a detachable cover, with both the solid feed inlet and the liquid feed pipe located on the cover. The discharge pipe is located on the bottom side of the tank, and the top of the flow guide is fixed to the bottom side of the cover. Several liquid inlet grooves are opened on the upper side wall of the flow guide.

[0009] Furthermore, sealed bearings are installed at the center of the bottom of both the cover and the tank for mounting the stirring shaft. The drive device is a motor, which is mounted on the bottom of the tank via a bracket. The motor is connected to the bottom end of the stirring shaft via a coupling.

[0010] Furthermore, the outer wall of the heat exchange jacket is of the same thickness as the tank body and is integral, while the inner wall is a heat exchange thin plate welded later, and several layers of heat exchange fins are arranged around the inner wall of the heat exchange thin plate surrounding the second condenser.

[0011] The advantages of this utility model are:

[0012] (1) In this utility model, axial mixing and radial mixing are used for multi-directional stirring, which can promote the full circulation of monomers in the tank, thereby improving the mixing effect. Under the action of the guide shroud and the propeller blade, the monomers will form internal and external circulation mixing. The liquid distribution plate can prevent the monomers from laminar flow upward along the outer wall of the guide shroud, thereby entering the shearing mixing area of ​​the rectangular blade and improving the mixing degree.

[0013] (2) The temperature in this utility model adopts zone control. The corresponding control temperature is set according to the hot spot. It is only necessary to ensure that the temperature in each cycle segment is slightly lower than the safety threshold. The heat absorption capacity to the outside is at a low level, which will greatly reduce energy consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional plan view of the present invention;

[0016] Figure 3 This is a sectional perspective view of the present invention;

[0017] Figure 4 This is a cross-sectional view of the fairing.

[0018] In the diagram: 1-Tank body, 11-Cover body, 12-Solid feed inlet, 13-Liquid feed pipe, 14-Discharge pipe, 2-Guide shroud, 21-Liquid inlet tank, 22-First condenser, 23-Temperature probe A, 3-Agitator shaft, 31-Sealed bearing, 32-Propeller blade, 33-Distributor plate, 34-Crank arm, 35-Rectangular blade, 4-Motor, 41-Coupling, 42-Support, 5-Second condenser, 51-Heat exchange fins, 52-Temperature probe B, 6-Third condenser, 61-Temperature probe C. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] As shown in the figure:

[0021] A multi-directional stirring and temperature-controlled monomer premixing device includes a tank (1). A stirring shaft (3) connected to a drive device is installed at the center of the tank (1). A propeller blade (32) is mounted on the stirring shaft (3). A flow guide (2) is installed around the propeller blade (32). A liquid distribution plate (33) is installed on the stirring shaft (3) near the bottom of the tank (1). Several radially welded crank arms (34) are attached to the peripheral wall of the liquid distribution plate (33). Rectangular blades (35) are fixed to the vertical portions of the crank arms (34). A first condenser (22) is fixed to the inner wall of the flow guide (2). The perimeter wall is provided with a second condenser (5) and a third condenser (6). The first condenser (22) is located within the height range of the rectangular blade (35). The second condenser (5) is located above the first condenser (22) and below the inlet height of the guide shroud (2). A temperature probe A (23) is installed on the outlet side of the inner wall of the guide shroud (2) for feedback control of the first condenser (22). A temperature probe B (52) is installed on the upper side of the first condenser (22) for feedback control of the second condenser (5). A temperature probe C (61) is installed on the upper side of the third condenser (6) for feedback control of the third condenser (6).

[0022] This invention employs axial and radial mixing for multi-directional stirring, which promotes full circulation of monomers within the tank (1), thereby enhancing the mixing effect. Under the action of the guide shroud (2) and propeller blades (32), the monomers will form internal and external circulation mixing. The separator (33) can prevent the monomers from flowing upward along the outer wall of the guide shroud (2) into the shear mixing zone of the rectangular blades (35), thus improving the mixing degree.

[0023] In this invention, temperature is controlled by zones. If the overall control method is used, the temperature is adjusted to a lower level, which increases the heat absorption capacity of the outside world and results in higher energy consumption. Zone control can avoid this problem, as it only needs to ensure the temperature in each cycle segment.

[0024] For example, if the safety control threshold temperature is set to T (3-4° below the denaturation temperature), and the temperatures of temperature probe A (23), temperature probe B (52), and temperature probe C (61) are T1, T2, and T3 respectively, the control logic is as follows:

[0025] First, the unit temperature (i.e., T3) entering the flow deflector (2) is relatively high. Due to the long shear path inside the flow deflector (2), the temperature rise will be relatively large, but the flow velocity is also relatively fast. The first condenser (22) is difficult to provide a large amount of condensation, so T3 needs to be at a relatively low temperature. Therefore, T3 needs to be 3-4 degrees Celsius lower than the safety control threshold temperature (T). Since the flow deflector (2) has a small flow cross-section and a fast flow velocity, the main function of the first condenser (22) is to slow down the temperature rise. Therefore, the outlet temperature of the flow deflector (2) is T1 = T3 + Δ Since Δ is less than 1℃, the contact time between the monomer entering the liquid separator (33) is relatively short, and the temperature rise is limited. The temperature of T1 is 2-3℃ lower than the safety control threshold temperature (T), so the temperature entering the rectangular blade (35) area can be guaranteed to be less than T. Therefore, the function of the second condenser (5) is to maintain the temperature so that the outlet temperature T2 is less than or equal to T. The main function of the third condenser (6) is to cool down quickly. Since the flow is upward laminar, the flow rate is relatively slow. The temperature can be reduced by 3-4 degrees Celsius to reach the temperature of T3. The values ​​of T1, T2, and T3 are used as feedback control data to control the cooling rate of each condenser. The simplest proportional control can be used.

[0026] Considering the structure of the device and ease of installation, the first condenser (22) is a coil fixed to the inner wall of the guide shroud (2), and the second condenser (5) and the third condenser (6) are both heat exchange jackets fixed to the outer wall of the tank (1). They are all connected to the refrigerant system. Temperature control is achieved by adjusting the flow rate of the refrigerant in the first condenser (22), the second condenser (5), and the third condenser (6) respectively. Specifically, temperature probes A (23), B (52), and C (61) are all connected to the PID controller. The PID controller is connected to the circulation pumps on the refrigerant circulation pipelines of the first condenser (22), the second condenser (5), and the third condenser (6) respectively. The refrigerant outlet temperature can be 10-15 degrees Celsius lower than the safety control threshold temperature (T). The PID controller and the refrigerant system are existing technologies and will not be described in detail here. Finished products can be purchased according to the requirements.

[0027] For ease of maintenance, the top of the tank (1) is a detachable cover (11). The solid feed inlet (12) and the liquid feed pipe (13) are both located on the cover (11). The discharge pipe (14) is located on the bottom side of the tank (1). The top of the flow guide (2) is fixed to the bottom side of the cover (11). Several liquid inlet grooves (21) are opened on the upper side wall of the flow guide (2) to facilitate the entry of individual units from the top of the tank (1) into the flow guide (2).

[0028] As an optimized solution, a sealed bearing (31) is installed at the bottom center of both the cover (11) and the tank (1) for installing the stirring shaft (3), thereby ensuring the stable operation of the stirring shaft (3). The driving device is a motor (4), which is installed at the bottom of the tank (1) through a bracket (42). The motor (4) is connected to the bottom end of the stirring shaft (3) through a coupling (41).

[0029] As an optimized design, the outer wall of the heat exchange jacket is of the same thickness as the tank (1) and is integral. The inner wall is a heat exchange thin plate welded later. Several layers of heat exchange fins (51) are arranged on the inner wall of the heat exchange thin plate surrounding the second condenser (5). Since the rectangular blade (35) area is mainly circulated, the layered heat exchange fins (51) can improve the heat exchange effect.

[0030] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A monomer premixing device with multi-directional stirring and temperature control, characterized in that: The device includes a tank body, a stirring shaft connected to a drive device is installed at the center of the tank body, a propeller blade is installed on the stirring shaft, a flow guide is installed around the propeller blade, a liquid distribution plate is installed on the stirring shaft near the bottom of the tank body, and several crank arms are welded radially to the peripheral wall of the liquid distribution plate, with rectangular propeller blades fixed to the vertical parts of the crank arms; a first condenser is fixed to the inner wall of the flow guide, and a second condenser and a third condenser are provided on the peripheral wall of the tank body, the first condenser is located within the height range of the rectangular propeller blades, and the second condenser is located above the first condenser and below the inlet height of the flow guide; Temperature probe A is installed on the outlet side of the inner wall of the flow guide for feedback control of the first condenser, temperature probe B is installed on the upper side of the first condenser for feedback control of the second condenser, and temperature probe C is installed on the upper side of the third condenser for feedback control of the third condenser.

2. The monomer premixing device with multi-directional stirring and temperature control according to claim 1, characterized in that: The first condenser is a coil fixed to the inner wall of the flow guide shroud. The second and third condensers are heat exchange jackets fixed to the outer peripheral wall of the tank and are connected to the refrigerant system. Temperature control is achieved by adjusting the refrigerant flow rate of the first, second, and third condensers respectively.

3. The monomer premixing device with multi-directional stirring and temperature control according to claim 2, characterized in that: It also includes a PID controller, wherein temperature probe A, temperature probe B, and temperature probe C are all connected to the PID controller, and the PID controller is connected to the circulation pumps on the refrigerant circulation pipelines of the first condenser, the second condenser, and the third condenser, respectively.

4. The monomer premixing device with multi-directional stirring and temperature control according to claim 1, characterized in that: The top of the tank is a detachable cover. The solid feed inlet and the liquid feed pipe are both located on the cover. The discharge pipe is located on the bottom side of the tank. The top of the flow guide is fixed to the bottom side of the cover. Several liquid inlet grooves are opened on the upper side wall of the flow guide.

5. The monomer premixing device with multi-directional stirring and temperature control according to claim 4, characterized in that: Both the cover and the bottom center of the tank are equipped with sealed bearings for mounting the stirring shaft. The drive device is a motor, which is mounted on the bottom of the tank via a bracket. The motor is connected to the bottom end of the stirring shaft via a coupling.

6. The monomer premixing device with multi-directional stirring and temperature control according to claim 2, characterized in that: The outer wall of the heat exchange jacket is of the same thickness as the tank body and is integral, while the inner wall is a heat exchange thin plate welded later, and several layers of heat exchange fins are arranged around the inner wall of the heat exchange thin plate surrounding the second condenser.

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