Tubular isothermal fixed reaction device

Abstract

A tubular isothermal fixed reaction device comprises a reactor outer shell, a plurality of tubular reaction beds, a cooling system and a stroke type metering pump, the tubular reaction beds are circumferentially and uniformly distributed in the reactor outer shell, the liquid inlet ends of the tubular reaction beds penetrate through the top end of the reactor outer shell to be connected with the stroke type metering pump, and the liquid outlet ends of the tubular reaction beds penetrate through the top end of the reactor outer shell to be connected with the cooling system. A partition plate is horizontally arranged at the lower end in the reactor outer shell, the bottoms of all the tube nest reaction beds penetrate through the partition plate to be communicated with a liquid outlet pipe, the bottom of the liquid outlet pipe penetrates through the bottom of the reactor outer shell, the cooling system comprises a cooling cavity, a cooling liquid inlet, a cooling liquid outlet and a stirring device, and the stirring device is fixed to the center of the partition plate. According to the utility model, the cooling cavity is formed between the reactor shell and the tube nest reaction bed, the cooling liquid is filled into the cooling cavity to cool the tube nest reaction bed, and the cooling liquid is stirred by the stirring paddle at the bottom, so that the uniform temperature control of the tube nest reaction bed is ensured.

Description

Technical Field

[0001] The utility model relates to a reactor, in particular to a tubular isothermal fixed reaction device. Background Art

[0002] A fixed bed reactor refers to a reactor filled with granular solid catalysts or solid reactants to form a stacked bed layer of a certain height. While gas or liquid materials flow through the gaps between the particles and pass through the stationary fixed bed layer, a moving bed and a fluidized bed where heterogeneous reactions occur are realized, also known as a packed bed reactor. Fixed bed reactors are widely used in gas-solid reactions and liquid-solid reaction processes. For example, in catalytic hydrogenation reactions, due to the intense heat release during the reaction, it is slightly difficult to control the reaction temperature. Most existing tubular fixed bed reactors are cooled by cooling tubes arranged inside the reactor during use. This cooling method cannot effectively cool down, and it will cause uneven temperatures in the tubular reactor, resulting in different reaction efficiencies during use and affecting the reaction results. Also, since the detection of the space velocity is crucial for the entire reaction process, the stability of the space velocity needs to be detected in real time to understand whether the entire reaction is uniform. Content of the Utility Model

[0003] In order to overcome the drawbacks of the prior art, the utility model provides a tubular isothermal fixed reaction device. The reactor shell and the tubular reaction bed are in a nested structure, and a cooling cavity is formed between them. A coolant is filled into the cooling cavity to cool the tubular reaction bed, and a stirring paddle at the bottom is used to stir the coolant to ensure uniform temperature control of the tubular reaction bed.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A tubular isothermal fixed reaction device, the reaction device includes a reactor outer shell, a tubular reaction bed, a cooling system and a reciprocating metering pump. A number of the tubular reaction beds are provided and are circumferentially and uniformly distributed inside the reactor outer shell. The liquid inlet end of the tubular reaction bed passes through the top end of the reactor outer shell and is connected to the liquid outlet of the reciprocating metering pump. A partition is horizontally arranged at the lower end inside the reactor outer shell. The bottoms of all the tubular reaction beds pass through the partition and are communicated with an outlet pipe. The bottom of the outlet pipe passes through the bottom of the reactor outer shell. The cooling system includes a cooling cavity formed between the reactor outer shell and the tubular reaction bed, a coolant inlet and a coolant outlet respectively arranged at the bottom and the upper part of the side wall of the reactor outer shell, and a stirring device. The stirring device is fixed at the central position on the partition.

[0006] The above-mentioned tubular isothermal fixed reaction device, the reaction device further includes a filtration system, including a filtration cavity, multiple filter cloths horizontally arranged at the middle position inside the filtration cavity, a raw material inlet and a filtrate outlet, which are arranged above the stroke metering pump, the filtrate outlet is connected to the top end of the stroke metering pump, and an electromagnetic valve is arranged at the filtrate outlet.

[0007] The above-mentioned tubular isothermal fixed reaction device, the reaction device is further provided with a preheating system, including a preheating cavity, a liquid inlet, a preheating liquid outlet and a weight sensor. A plurality of weight sensors are arranged and evenly distributed at the bottom of the preheating cavity. The liquid inlet and the preheating liquid outlet are respectively arranged at the middle positions of the top and bottom of the preheating cavity. The preheating liquid outlet is connected to the raw material inlet through a pipeline. The liquid inlet is connected to a liquid inlet pump, and electromagnetic valves are arranged at both the liquid inlet and the preheating liquid outlet.

[0008] The above-mentioned tubular isothermal fixed reaction device, the stirring device includes a stirring blade, a central shaft, a reducer and a stirring motor. The reducer is connected to the stirring motor. The bottom end of the central shaft is connected to the reducer through a coupling. The central shaft passes through the partition plate and is connected to the stirring blade. The central shaft and the partition plate are connected through a bearing. The stirring motor is fixed on the lower surface of the partition plate.

[0009] The above-mentioned tubular isothermal fixed reaction device, temperature sensors are arranged at the top end and inner wall of each tubular reaction bed, the inner wall of the filtrate outlet, and the inner wall of the preheating cavity.

[0010] The above-mentioned tubular isothermal fixed reaction device, the weight sensor is a spring type sensor.

[0011] The beneficial effects of the present utility model are as follows: The present utility model forms a cooling cavity between the nested outer shell and the tubular reaction bed, and externally cooperates with a cooling and heating machine to control the temperature of the tubular reaction bed. The internal stirring blade makes the temperature of the coolant inside the cooling cavity more uniform, ensuring that the reaction temperature inside the tubular reactor is more uniform, and the reaction is more balanced and stable; by arranging temperature sensors on the reactor tubes, the computer automatically controls the temperature of the cooling and heating machine based on the temperature received from the reactor tubes, making it more convenient to ensure the ideal reaction temperature throughout the reaction process; through the filter arranged at the top of the tubular reactor, solid reaction substances in the liquid to be reacted can be effectively filtered out, ensuring the reaction efficiency; through the preheater at the top of the filter, the liquid to be reacted can lose a small amount of heat in the entire reactor and enter the fixed bed reactor. The weight sensor arranged in the preheater is used to detect the mass change of the liquid to be reacted per unit time, and the liquid mass flow rate is calculated by feeding the data change back to the computer. Description of the Drawings

[0012] The present utility model will be further described below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a schematic structural diagram of the overall device of the present utility model;

[0014] Figure 2 is Figure 1 a schematic structural diagram in the A-A direction in

[0015] Figure 3 a schematic structural diagram of the stirring device.

[0016] In the figure: 1. Reactor outer shell; 2. Tube reactor bed; 3. Stroke metering pump; 4. Liquid outlet pipe; 5. Partition board; 6. Cooling cavity; 7. Coolant inlet; 8. Coolant outlet; 9. Stirring device; 9-1. Stirring paddle; 9-2. Central shaft; 9-3. Reducer; 9-4. Stirring motor; 10. Filtration system; 10-1. Filtration cavity; 10-2. Multi-layer filter cloth; 10-3. Raw material inlet; 10-4. Filtrate outlet; 11. Preheating system; 11-1. Preheating cavity; 11-2. Liquid inlet; 11-3. Preheated liquid outlet; 11-4. Weight sensor. Specific embodiments

[0017] The present utility model will be further described below in conjunction with the accompanying drawings.

[0018] Refer to Figures 1 to 3, the utility model relates to a tubular isothermal fixed reaction device, which includes a reactor outer shell 1, a tubular reaction bed 2, a cooling system, a reciprocating metering pump 3, a filtration system 10 and a preheating system 11. A plurality of tubular reaction beds are arranged and circumferentially distributed inside the reactor outer shell 1. The liquid inlet end of the tubular reaction bed 2 passes through the top end of the reactor outer shell 1 and is connected to the liquid outlet of the reciprocating metering pump 3. The top inlet of the reciprocating metering pump 3 is connected to the filtrate outlet 10-4 of the filtration system 10. The preheated liquid outlet 11-3 at the bottom of the preheating system 11 is connected to the raw material inlet 10-3 at the top of the filtration system. A partition plate 5 is horizontally and hermetically arranged at the lower end inside the reactor outer shell 1. The bottoms of all the tubular reaction beds 2 pass through the partition plate 5 and are communicated with a liquid outlet pipe 4. The partition plate 5 divides the tubular reaction bed into an upper reaction bed and a lower product outflow part. The connection between the tubular reaction bed and the partition plate is hermetically connected to prevent the coolant from entering the liquid outlet cavity below the partition plate. The bottom of the liquid outlet pipe 4 passes through the bottom of the reactor outer shell 1. The cooling system includes a cooling cavity 6 formed between the reactor outer shell 1 and the tubular reaction bed 2, a coolant inlet 7 and a coolant outlet 8 respectively arranged at the bottom and the upper part of the side wall of the reactor outer shell 1, and a stirring device 9. The coolant inlet 7 and the coolant outlet 8 are respectively externally connected to a cooling and heating machine for introducing coolant into the cooling cavity 6 to control the reaction temperature inside the tubular reaction bed. The stirring device 9 is fixed at the central position on the partition plate 5. The stirring device includes a stirring blade 9-1, a central shaft 9-2, a speed reducer 9-3 and a stirring motor 9-4. The speed reducer 9-3 is connected to the stirring motor 9-4. The bottom end of the central shaft 9-2 is connected to the speed reducer 9-3 through a coupling. The central shaft 9-2 passes through the partition plate 5 and is connected to the stirring blade 9-1. The stirring motor 9-4 is fixed on the lower surface of the partition plate 5. The stirring blade is used to stir and turbulize the coolant, making the temperature of the coolant inside the cooling cavity more uniform and ensuring the uniformity of the reaction.

[0019] Before the raw materials enter the tubular reactor bed, they enter the preheating cavity 11-1 in the preheating system 11 through the liquid inlet 11-2 in the existing preheating system 11 and are preheated to a predetermined temperature. A signal is transmitted by the temperature sensor on its inner wall, and the solenoid valve at the preheating liquid outlet 11-3 opens to drain the liquid downward. The liquid is drained into the filtering cavity 10-1 in the filtering system 10, and the mass flow rate of the liquid is detected in real time by the data of the weight sensor 11-4 at the bottom of the preheating cavity 11-1 fed back to the computer; after the liquid in the filtering cavity 10-1 is filtered by the multi-layer filter cloth 10-2 inside it, the solenoid valve at the filtrate outlet 10-4 opens, and the filtrate flows out and enters the reciprocating metering pump 3. From its multiple outlets (such as eight), it evenly flows into multiple tubular reactor beds (such as eight) docked with it. As the reaction progresses, the reaction liquid flows out through the liquid outlet pipe 4 connected to the bottom of the tubular reactor bed. During the reaction process, the tubular reactor bed is cooled by the cooling system. Temperature sensors are provided at the top and inner wall of each of the tubular reactor beds 2, the inner wall of the filtrate outlet 10-4, and the inner wall of the preheating cavity 11-1 to facilitate real-time monitoring of the reaction system temperature.

Claims

1. A tubular isothermal fixed reaction device, characterized in that: The reaction device comprises a reactor shell (1), a tubular reaction bed (2), a cooling system and a stroke metering pump (3). The tubular reaction bed is provided with a plurality of tubular reaction beds, which are uniformly distributed in the circumferential direction inside the reactor shell (1). The liquid inlet end of the tubular reaction bed (2) passes through the top end of the reactor shell (1) and is connected to the liquid outlet of the stroke metering pump (3). A partition plate (5) is horizontally sealed at the lower end of the reactor shell (1). The bottoms of all the tubular reaction beds (2) pass through the partition plate (5) and are connected to the liquid outlet pipe (4). The bottom of the liquid outlet pipe (4) passes through the bottom of the reactor shell (1). The cooling system comprises a cooling cavity (6) formed between the reactor shell (1) and the tubular reaction bed (2), a cooling liquid inlet (7) and a cooling liquid outlet (8) respectively provided at the bottom and the upper part of the side wall of the reactor shell (1), and a stirring device (9). The stirring device (9) is fixed at the center position of the partition plate (5).

2. The tubular isothermal fixed reaction device according to claim 1, characterized in that: The reaction device further comprises a filtering system (10), comprising a filtering chamber (10-1), a multi-layer filter cloth (10-2) horizontally arranged in the middle of the filtering chamber (10-1), a raw material inlet (10-3) and a filtrate outlet (10-4), which is arranged above the stroke metering pump (3), the filtrate outlet (10-4) being connected to the top inlet of the stroke metering pump (3), and an electromagnetic valve being arranged at the filtrate outlet (10-4).

3. The tubular isothermal fixed reaction device according to claim 2, characterized in that: The reaction device is also provided with a preheating system (11), comprising a preheating chamber (11-1), a liquid inlet (11-2), a preheating liquid outlet (11-3) and a weight sensor (11-4); a plurality of weight sensors (11-4) are provided and are evenly distributed at the bottom of the preheating chamber (11-1); the liquid inlet (11-2) and the preheating liquid outlet (11-3) are respectively provided at the middle positions of the top and bottom of the preheating chamber (11-1); the preheating liquid outlet (11-3) is connected to the raw material inlet (10-3) via a pipeline; the liquid inlet (11-2) is connected to a liquid inlet pump; and electromagnetic valves are provided at the liquid inlet (11-2) and the preheating liquid outlet (11-3).

4. The tubular isothermal fixed reaction device according to claim 3, characterized in that: The stirring device comprises a stirring blade (9-1), a central shaft (9-2), a reducer (9-3) and a stirring motor (9-4); the reducer (9-3) is connected to the stirring motor (9-4); the bottom end of the central shaft (9-2) is connected to the reducer (9-3) via a coupling; the central shaft (9-2) passes through the partition (5) and is connected to the stirring blade (9-1); and the stirring motor (9-4) is fixed on the lower surface of the partition (5).

5. The tubular isothermal fixed reaction device according to claim 4, characterized in that: Temperature sensors are provided on the top and inner wall of each tubular reaction bed (2), the inner wall of the filtrate outlet (10-4), and the inner wall of the preheating chamber (11-1).

6. The shell-and-tube isothermal fixed reaction device according to claim 5, characterized in that: The weight sensor (11-4) is a spring-type sensor.

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