Combined stirring paddle arranged in reaction kettle

Abstract

The utility model discloses a combined stirring paddle arranged in a reaction kettle, which comprises a main stirring shaft and an auxiliary stirring shaft which are coaxially arranged, the main stirring shaft and the auxiliary stirring shaft are respectively connected with a main stirring power machine and an auxiliary stirring power machine, a stirring paddle group is arranged on the main stirring shaft, a wall-expanding paddle group is arranged on the auxiliary stirring shaft, and the main stirring shaft and the auxiliary stirring shaft are respectively connected with the main stirring power machine and the auxiliary stirring power machine. The stirring device has the advantages of simple structure, high stirring efficiency and wide application range.

Description

Technical Field

[0001] The utility model relates to a stirring paddle, in particular to a combined stirring paddle arranged in a reaction kettle. Background Art

[0002] Stirred reactor is an important chemical equipment, widely used in petrochemical, biochemical, fine chemical, pharmaceutical and food industries. Most stirred reactors use reactors as containers for physical or chemical reactions. Through the structural design and parameter configuration of the reactor, the heating, evaporation, cooling and low-speed mixing functions required by the process are realized. Reactors are widely used in the fields of petroleum, chemical, rubber, pesticide, dye, medicine, food, etc., and are generally made of carbon manganese steel, stainless steel and other composite materials.

[0003] The stirring paddle is set in the reactor and is a key component of the stirred reactor. Its structure directly affects the reaction process. Different reaction systems have different rheological characteristics, as well as requirements for phase dispersion and contact, reaction characteristics, reaction conversion rate, selectivity, etc. Some reactions involve liquid / solid phases (the solid phase is a catalyst or reactant), and the solid phase must be suspended to achieve solid phase dispersion; the liquid phase is a viscous substance, and as the reaction proceeds, it can change from thick to thin (degradation of reactants) or from thin to thick (polymerization of reactants), and the viscosity varies greatly. In addition, in some polymerization reactions, due to the centrifugal force during the stirring process, the material will be thrown on the reactor wall and the bottom of the inner wall, which is easy to produce wall sticking, which in turn affects heat transfer. Especially for industrial continuous polymerization reactions, wall sticking will seriously affect the long-term stable operation of the device. Therefore, it is necessary to select different types of blades to promote cyclic mixing, heat and mass transfer, and reaction. Generally speaking, low-viscosity systems use small-sized (propeller diameter relative to kettle diameter) and high-speed propellers, such as various turbines (disc straight blades, inclined blades, concave blades, etc.); high-viscosity systems use large-sized and low-speed propellers (such as ribbon type and anchor type). The main differences between different types of propellers are the geometric configuration and number of blades that constitute the stirring propeller, and their relative position to the rotating shaft (installation method, connection method, etc.). Common geometric configurations of blades include ribbon type, anchor type, rectangular type, rod type, etc. The number of blades is usually 2 to 6 (can be more).

[0004] The agitator paddles in the prior art mainly include single-structure agitator paddles and combined agitator paddles. The single-structure agitator paddles are difficult to adapt to complex working conditions; while the suitable agitator speeds of different paddle types of combined agitator paddles vary greatly, and the agitator efficiency is low at the same agitator speed. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a combined stirring paddle arranged in a reaction kettle which has a simple structure, high stirring efficiency and a wide application range.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a combined stirring paddle arranged in a reaction kettle, comprising a main stirring shaft and an auxiliary stirring shaft arranged coaxially, the main stirring shaft and the auxiliary stirring shaft are respectively connected to a main stirring power machine and an auxiliary stirring power machine, the main stirring shaft is provided with a stirring blade group, and the auxiliary stirring shaft is provided with a wall scraping blade group.

[0007] Preferably, the main stirring shaft and the auxiliary stirring shaft pass through the upper and lower openings of the reactor and are connected to the main stirring power machine and the auxiliary stirring power machine. The main stirring shaft and the auxiliary stirring shaft pass through the upper and lower openings of the reactor and are connected to their respective stirring power machines. Independent dynamic sealing mechanisms can be set for each, avoiding complex two-stage dynamic sealing mechanisms, effectively improving reliability, and ensuring long-term stable operation.

[0008] Preferably, a connecting cage is provided on the auxiliary stirring shaft, and the wall scraping blade group is provided on the connecting cage. More preferably, an elastic buffer mechanism is provided between the connecting cage and the wall scraping blade group, and the wall scraping blade group is provided on the connecting cage through the elastic buffer mechanism. The advantage of providing an elastic buffer mechanism is that it can be applied to reactors with various inner wall shapes, so as to better scrape off the sticky matter on the inner wall of the reactor.

[0009] Preferably, the auxiliary stirring shaft is composed of a first auxiliary stirring shaft, a second auxiliary stirring shaft, a third auxiliary stirring shaft and a fourth auxiliary stirring shaft which are not connected to each other, the fourth auxiliary stirring shaft is connected to the auxiliary stirring power machine, the first auxiliary stirring shaft, the second auxiliary stirring shaft, the third auxiliary stirring shaft and the fourth auxiliary stirring shaft are sequentially spaced and mounted on the main stirring shaft, the main stirring shaft is provided with a first stirring blade, a second stirring blade and a third stirring blade, the first stirring blade is arranged between the first auxiliary stirring shaft and the second auxiliary stirring shaft, the second stirring blade is arranged between the second auxiliary stirring shaft and the third auxiliary stirring shaft, and the third stirring blade is arranged between the third auxiliary stirring shaft and the fourth auxiliary stirring shaft.

[0010] Preferably, the connecting cage is respectively connected to the first auxiliary stirring shaft, the second auxiliary stirring shaft, the third auxiliary stirring shaft and the fourth auxiliary stirring shaft through a plurality of connecting rods, so as to effectively avoid the stirring blade group on the main stirring shaft from transmitting stirring power.

[0011] Preferably, the first stirring blade, the second stirring blade and the third stirring blade are propellers or turbine blades.

[0012] Preferably, at least one group of gas distributors is provided on the fourth auxiliary stirring shaft, and the fourth auxiliary stirring shaft is provided with a middle hole pipe for allowing gas to pass into the gas distributor.

[0013] Preferably, the gas distributor is a tubular gas distributor or a plate gas distributor.

[0014] In the present invention, the coaxially arranged main stirring shaft and auxiliary stirring shaft are connected to the main stirring power machine and the auxiliary stirring power machine respectively, and the main stirring shaft and the auxiliary stirring shaft can rotate at different speeds or at the same speed, in the same direction or in different directions. Preferably, the ratio of the rotation speed of the auxiliary stirring shaft to the rotation speed of the main stirring shaft is 1:1 to 1000.

[0015] In the utility model, in order to reduce the resistance between the main stirring shaft and the auxiliary stirring shaft during rotation, a sliding sleeve can be arranged between the main stirring shaft and the auxiliary stirring shaft. The sleeve material can be a soft self-lubricating material, such as polytetrafluoroethylene, modified polytetrafluoroethylene, ultra-high molecular weight polyethylene, modified ultra-high molecular weight polyethylene, polyoxymethylene, modified polyoxymethylene, PEEK, modified PEEK, etc.

[0016] In the utility model, the wall scraping blade group can be arranged corresponding to the first auxiliary stirring shaft, the second auxiliary stirring shaft, the third auxiliary stirring shaft and the fourth auxiliary stirring shaft to be composed of the first wall scraping blade, the second wall scraping blade, the third wall scraping blade and the fourth wall scraping blade. The first wall scraping blade, the second wall scraping blade and the third wall scraping blade are mainly used to scrape off the sticky wall on the side wall of the reactor, and the fourth wall scraping blade is mainly used to scrape off the sticky wall on the bottom of the reactor. The first wall scraping blade, the second wall scraping blade, the third wall scraping blade and the fourth wall scraping blade can also serve as baffles to further enhance the suction, shearing, dispersion, mixing and circulation of the reaction materials.

[0017] In the utility model, the first scraping blade, the second scraping blade, the third scraping blade and the fourth scraping blade can be made of soft self-lubricating materials, such as polytetrafluoroethylene, modified polytetrafluoroethylene, ultra-high molecular weight polyethylene, modified ultra-high molecular weight polyethylene, polyoxymethylene, modified polyoxymethylene, PEEK, modified PEEK, etc. The use of soft self-lubricating materials can be better applied to reactors with various inner wall shapes, and further improve the efficiency of scraping off sticky objects on the inner wall of the reactor.

[0018] Compared with the prior art, the utility model has the advantages that: by coaxially arranging the main stirring shaft and the auxiliary stirring shaft, the main stirring shaft and the auxiliary stirring shaft are respectively connected to the main stirring power machine and the auxiliary stirring power machine, and a stirring blade group is arranged on the main stirring shaft, and a wall scraping blade group is arranged on the connecting cage frame on the auxiliary stirring shaft, so that the stirring blade group and the wall scraping blade group can be rotated in the same direction or in different directions, and two different speeds can be selected according to the needs of different operating conditions and working conditions. The stirring blade group can realize the suction, shearing, dispersion, mixing, and circulation functions of the reaction material, and the wall scraping blade group can effectively scrape off the wall sticking material. Through the synergistic effect of the stirring blade group and the wall scraping blade group, the stirring efficiency can be significantly improved, the reaction material can be dispersed and mixed more fully, the temperature distribution is more uniform, and the solid material on the kettle wall and the bottom of the kettle is less adhered, so that it can operate stably for a long period of time. The utility model can be applied to reaction systems with different operating conditions and working conditions, especially to medium and low viscosity reaction systems with material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] like Figure 1 As shown: a main stirring shaft 1; a first auxiliary stirring shaft 2-1; a second auxiliary stirring shaft 2-2; a third auxiliary stirring shaft 2-3; a fourth auxiliary stirring shaft 2-4; a first stirring blade 3-1; a second stirring blade 3-2; a third stirring blade 3-3; a first wall-squeezing blade 4-1; a second wall-squeezing blade 4-2; a third wall-squeezing blade 4-3; a fourth wall-squeezing blade 4-4; a connecting cage 5; a gas distributor 6; a reactor 7; a medium-hole pipe 9; and a connecting rod 10. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and embodiments. The implementation methods of the utility model include but are not limited to the following embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] like Figure 1 As shown, the combined stirring paddle arranged in the reactor of the utility model includes a main stirring shaft 1 and an auxiliary stirring shaft which are coaxially arranged. The main stirring shaft 1 and the auxiliary stirring shaft are respectively connected to the main stirring power machine and the auxiliary stirring power machine. The main stirring shaft 1 is provided with a stirring blade group, and the auxiliary stirring shaft is provided with a wall scraping blade group.

[0023] The main stirring shaft 1 and the auxiliary stirring shaft pass through the openings at the upper and lower ends of the reactor 7 and are connected to the main stirring power machine and the auxiliary stirring power machine. According to actual production conditions, the ratio of the rotation speed of the auxiliary stirring shaft to the rotation speed of the main stirring shaft 1 can be set to 1:1~1000.

[0024] The stirring blade group is composed of a first stirring blade 3-1, a second stirring blade 3-2 and a third stirring blade 3-3. According to actual production conditions, the first stirring blade 3-1, the second stirring blade 3-2 and the third stirring blade 3-3 can be propellers or turbine blades.

[0025] The auxiliary stirring shaft is composed of a first auxiliary stirring shaft 2-1, a second auxiliary stirring shaft 2-2, a third auxiliary stirring shaft 2-3 and a fourth auxiliary stirring shaft 2-4 which are not connected to each other, and the fourth auxiliary stirring shaft 2-4 is connected to the auxiliary stirring power machine; the first auxiliary stirring shaft 2-1, the second auxiliary stirring shaft 2-2, the third auxiliary stirring shaft 2-3 and the fourth auxiliary stirring shaft 2-4 are sequentially spaced and sleeved on the main stirring shaft 1; the fourth auxiliary stirring shaft 2-4 is provided with at least one group of gas distributors 6, and according to actual production conditions, the gas distributor 6 can adopt a tubular gas distributor or a plate gas distributor; the fourth auxiliary stirring shaft 2-4 is also provided with a medium-hole pipe 9 for allowing gas to pass into the gas distributor 6; the auxiliary stirring shaft is also provided with a connecting cage 5; the connecting cage 5 is respectively connected to the first auxiliary stirring shaft 2-1, the second auxiliary stirring shaft 2-2, the third auxiliary stirring shaft 2-3 and the fourth auxiliary stirring shaft 2-4 through a plurality of connecting rods 10.

[0026] The wall-squeezing paddle group is arranged corresponding to the first auxiliary stirring shaft 2-1, the second auxiliary stirring shaft 2-2, the third auxiliary stirring shaft 2-3 and the fourth auxiliary stirring shaft 2-4 to be composed of the first wall-squeezing paddle 4-1, the second wall-squeezing paddle 4-2, the third wall-squeezing paddle 4-3 and the fourth wall-squeezing paddle 4-4; the first stirring paddle 3-1 is arranged between the first auxiliary stirring shaft 2-1 and the second auxiliary stirring shaft 2-2, the second stirring paddle 3-2 is arranged between the second auxiliary stirring shaft 2-2 and the third auxiliary stirring shaft 2-3, and the third stirring paddle 3-3 is arranged between the third auxiliary stirring shaft 2-3 and the fourth auxiliary stirring shaft 2-4; the first wall-squeezing paddle 4-1, the second wall-squeezing paddle 4-2, the third wall-squeezing paddle 4-3 and the fourth wall-squeezing paddle 4-4 are arranged on the connecting cage 5.

[0027] In the above embodiment, an elastic buffer mechanism (not shown) can be provided between the connecting cage 5 and the first wall scraping blade 4-1, the second wall scraping blade 4-2, the third wall scraping blade 4-3 and the fourth wall scraping blade 4-4, and the first wall scraping blade 4-1, the second wall scraping blade 4-2, the third wall scraping blade 4-3 and the fourth wall scraping blade 4-4 are provided on the connecting cage 5 through the elastic buffer mechanism. The advantage of providing the elastic buffer mechanism is that it can be applied to reactors 7 with various inner wall shapes, so as to better scrape off the sticky wall on the inner wall of the reactor 7.

Claims

1. A combined stirring paddle arranged in a reaction kettle, characterized in that: The invention comprises a main stirring shaft and an auxiliary stirring shaft which are coaxially arranged. The main stirring shaft and the auxiliary stirring shaft are respectively connected to a main stirring power machine and an auxiliary stirring power machine. The main stirring shaft is provided with a stirring blade group, and the auxiliary stirring shaft is provided with a wall scraping blade group.

2. The combined stirring blade arranged in the reaction kettle according to claim 1, characterized in that: The main stirring shaft and the auxiliary stirring shaft are respectively passed through the openings at the upper and lower ends of the reactor to pass out of the reactor and are connected to the main stirring power machine and the auxiliary stirring power machine.

3. The combined stirring blade arranged in the reaction kettle according to claim 2, characterized in that: The auxiliary stirring shaft is provided with a connecting cage, and the wall scraping blade group is arranged on the connecting cage.

4. The combined stirring blade arranged in the reaction kettle according to claim 3, characterized in that: An elastic buffer mechanism is arranged between the connecting cage and the wall-scraping blade group, and the wall-scraping blade group is arranged on the connecting cage through the elastic buffer mechanism.

5. A combined stirring blade arranged in a reaction kettle according to claim 3 or 4, characterized in that: The auxiliary stirring shaft is composed of a first auxiliary stirring shaft, a second auxiliary stirring shaft, a third auxiliary stirring shaft and a fourth auxiliary stirring shaft which are not connected to each other. The fourth auxiliary stirring shaft is connected to the auxiliary stirring power machine. The first auxiliary stirring shaft, the second auxiliary stirring shaft, the third auxiliary stirring shaft and the fourth auxiliary stirring shaft are sequentially and spaced apart on the main stirring shaft. The main stirring shaft is provided with a first stirring blade, a second stirring blade and a third stirring blade. The first stirring blade is arranged between the first auxiliary stirring shaft and the second auxiliary stirring shaft, the second stirring blade is arranged between the second auxiliary stirring shaft and the third auxiliary stirring shaft, and the third stirring blade is arranged between the third auxiliary stirring shaft and the fourth auxiliary stirring shaft.

6. The combined stirring blade arranged in the reaction kettle according to claim 5, characterized in that: The connecting cage is respectively connected to the first auxiliary stirring shaft, the second auxiliary stirring shaft, the third auxiliary stirring shaft and the fourth auxiliary stirring shaft through a plurality of connecting rods.

7. The combined stirring blade arranged in the reaction kettle according to claim 5, characterized in that: The first stirring blade, the second stirring blade and the third stirring blade are propellers or turbine blades.

8. The combined stirring blade arranged in the reaction kettle according to claim 5, characterized in that: The fourth auxiliary stirring shaft is provided with at least one group of gas distributors, and the fourth auxiliary stirring shaft is provided with a middle hole pipe for allowing gas to pass into the gas distributor.

9. The combined stirring blade arranged in the reaction kettle according to claim 8, characterized in that: The gas distributor is a tubular gas distributor or a plate gas distributor.

10. The combined stirring blade arranged in a reaction kettle according to claim 1, characterized in that: The ratio of the rotation speed of the auxiliary stirring shaft to the rotation speed of the main stirring shaft is 1:1-1000.

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