Tubular reaction calorimetric device

Abstract

The utility model discloses a tubular reaction calorimetric device which comprises a first delivery pump, the first delivery pump is communicated with a first tubular reactor through a pipeline, and a first heat exchange medium inlet pipe is installed at the bottom of the first tubular reactor. A first medium flowmeter and a first inlet temperature transmitter are sequentially installed on the outer side wall of the first heat exchange medium inlet pipe from bottom to top, a first heat exchange medium outlet pipe is installed on the top of the first heat exchange medium inlet pipe, and a first outlet temperature transmitter is installed on the outer side wall of the first heat exchange medium outlet pipe. The outer side wall of the first heat exchange medium outlet pipe is communicated with a second tubular reactor through a pipeline, the bottom of the second tubular reactor is communicated with a second heat exchange medium inlet pipe, and the outer side wall of the second heat exchange medium inlet pipe is sequentially provided with a second medium flowmeter and a second inlet temperature transmitter from bottom to top; therefore, the effect of automatically measuring the heat release speed of the tubular reactor is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experimental equipment, in particular to a tubular reaction calorimetric device. Background Art

[0002] Reaction calorimetry research is of great significance in chemical production, mainly in the following aspects: 1. Safety assessment: It can help determine the potential risk of thermal runaway in the reaction process, so as to take corresponding measures to ensure production safety and avoid catastrophic accidents. 2. Process optimization: By accurately measuring the heat of reaction, it can provide key data for the optimization of process conditions, such as temperature control, feeding rate, etc., to improve reaction efficiency and selectivity. 3. Energy saving and consumption reduction: Understanding the thermal effect of the reaction helps to design a more reasonable energy utilization plan, reduce energy consumption, and improve the economy of production. 4. Equipment design: Provide a basis for the design of production equipment such as reactors to ensure that they can adapt to the heat load requirements of specific reactions. Before the new process production line is implemented in chemical production, a reaction risk assessment is required. The assessment process mainly studies the thermal behavior of materials and reactions. One of the important items is to measure and evaluate the reaction heat.

[0003] At present, the safety and environmental supervision faced by chemical production is becoming more and more stringent. The production process of many products has changed from the original intermittent production method to the continuous production method. Due to the change of process, the first process certification and evaluation are required. At present, the reaction calorimetry tests conducted by almost all institutions are based on batch processes, and all calorimetric devices on the market are also designed based on batch operations. Although the enthalpy of chemical reactions is related to the reaction itself and is not affected by batch or continuous operations, the risks brought by the reaction itself are different due to different reaction conditions such as concentration, temperature, and pressure. In other words, the risk conditions that can be accommodated by different heat release and heat exchange methods will be different. It is inappropriate to directly apply the risk assessment of batch processes to continuous processes. Although industry insiders all recognize that the risks of continuous processes are much lower than those of batch processes, there is no corresponding device to provide direct calorimetric and evaluation data, and no quantitative data can be provided to illustrate the problem.

[0004] The tubular reactor is the most common reactor type in continuous process schemes. It has a simple structure, low cost, good versatility, and there are many forms of tubular reactors, such as coil reactors and tube-in-tube reactors. Internal components can also be installed in the pipeline to approach the mass transfer conditions of microchannel reactors.

[0005] Reaction calorimetry technology simulates the production process through a small device, and measures and infers the risks in the production process by measuring the heat data. The same reaction will present different risks in different reactors. For example, when the heat released by a kettle reaction is converted into an adiabatic temperature rise and exceeds the boiling point of the reaction solvent, the evaluation result may cause short-term damage to the production workshop. However, the same reaction in a closed pipe will not cause destructive consequences, but will only increase the reaction pressure, while a tubular reaction only needs to increase the back pressure. Therefore, it is inappropriate to use kettle calorimetry data to directly evaluate a tubular reaction. However, the reaction calorimetry devices on the market are almost all kettle reactions, and there are no calorimetric devices for tubular reactors. Utility Model Content

[0006] The utility model aims to provide a tubular reaction calorimeter, which has the characteristic of realizing automatic measurement of the heat release speed of the tubular reactor.

[0007] To achieve the above object, the utility model provides the following technical solutions: a tubular reaction calorimetric device, comprising a first delivery pump, the first delivery pump is connected to a first tubular reactor through a pipeline, a first heat exchange medium inlet pipe is installed at the bottom of the first tubular reactor, a first medium flow meter and a first inlet temperature transmitter are installed on the outer side wall of the first heat exchange medium inlet pipe from bottom to top, a first heat exchange medium outlet pipe is installed on the top of the first heat exchange medium inlet pipe, and a first outlet temperature transmitter is installed on the outer side wall of the first heat exchange medium outlet pipe;

[0008] The outer wall of the first heat exchange medium outlet pipe is connected to the second tubular reactor through a pipeline, the bottom of the second tubular reactor is connected to the second heat exchange medium inlet pipe, the outer wall of the second heat exchange medium inlet pipe is sequentially installed with a second medium flow meter and a second inlet temperature transmitter from bottom to top, the top of the second tubular reactor is installed with a second heat exchange medium outlet pipe, and the outer wall of the second heat exchange medium outlet pipe is installed with a second outlet temperature transmitter.

[0009] In order to facilitate the transportation of materials to the interior of the first tubular reactor for heat exchange operations, as a preferred tubular reaction calorimetric device of the utility model, a second delivery pump is arranged below the first delivery pump, and the second delivery pump is connected to the pipeline between the first delivery pump and the first tubular reactor through a pipeline.

[0010] In order to facilitate the transportation of materials to the interior of the second tubular reactor for heat exchange operations, as a preferred tubular reaction calorimetric device of the utility model, a third delivery pump is arranged below the second delivery pump, and the third delivery pump is connected to the pipeline between the first tubular reactor and the second tubular reactor through a pipeline.

[0011] In order to transport the reacted materials to a receiving tank for collection, as a preferred tubular reaction calorimetric device of the present invention, the outer side wall of the second tubular reactor is connected to the receiving tank through a pipeline.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] When the utility model is used, the materials can be mixed and transported to the first tubular reactor by starting the first delivery pump and the second delivery pump. At this time, the first heat exchange medium inlet pipe can pass the heat exchange medium into the first tubular reactor, and the first medium flow meter and the first inlet temperature transmitter can monitor the flow rate and temperature of the heat exchange medium. Then the heat exchange medium flows out from the first heat exchange medium outlet pipe. At this time, the first outlet temperature transmitter can monitor the temperature of the outflowing heat exchange medium. Then, by starting the third delivery pump, the materials from the outlet of the first tubular reactor can be mixed and transported to the second tubular reactor for heat exchange. At this time, the second heat exchange medium inlet pipe can pass the heat exchange medium into the second tubular reactor, and the second medium flow meter and the second inlet temperature transmitter can monitor the flow rate and temperature of the heat exchange medium. When the heat exchange medium flows out from the second heat exchange medium outlet pipe, the second outlet temperature transmitter can monitor the temperature of the outflowing heat exchange medium. Finally, the reaction liquid leaves the second tubular reactor and enters the receiving tank for collection;

[0014] When the continuous reaction is in a stable state, the value of each sensor is recorded, and the PLC system is used to measure and record the data, so that automatic calculation can be achieved through computer software. The heat release rate of the first tubular reactor and the second tubular reactor can be calculated through thermal balance, thereby achieving the effect of automatically measuring the heat release rate of the tubular reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the utility model;

[0016] Figure 2 It is a cross-sectional structural diagram of the first tubular reactor and the second tubular reactor of the utility model.

[0017] In the figure: 1. first delivery pump; 2. second delivery pump; 3. third delivery pump; 4. first tubular reactor; 5. first heat exchange medium inlet pipe; 6. first medium flow meter; 7. first inlet temperature transmitter; 8. first heat exchange medium outlet pipe; 9. first outlet temperature transmitter; 10. second tubular reactor; 11. second heat exchange medium inlet pipe; 12. second medium flow meter; 13. second inlet temperature transmitter; 14. second heat exchange medium outlet pipe; 15. second outlet temperature transmitter; 16. receiving tank. DETAILED DESCRIPTION

[0018] See also Figure 1 to Figure 2 A tubular reaction calorimetric device comprises a first delivery pump 1, the first delivery pump 1 is connected to a first tubular reactor 4 through a pipeline, a first heat exchange medium inlet pipe 5 is installed at the bottom of the first tubular reactor 4, a first medium flow meter 6 and a first inlet temperature transmitter 7 are installed on the outer wall of the first heat exchange medium inlet pipe 5 from bottom to top, a first heat exchange medium outlet pipe 8 is installed on the top of the first heat exchange medium inlet pipe 5, and a first outlet temperature transmitter 9 is installed on the outer wall of the first heat exchange medium outlet pipe 8;

[0019] The outer wall of the first heat exchange medium outlet pipe 8 is connected to the second tubular reactor 10 through a pipeline, the bottom of the second tubular reactor 10 is connected to the second heat exchange medium inlet pipe 11, the outer wall of the second heat exchange medium inlet pipe 11 is installed with a second medium flow meter 12 and a second inlet temperature transmitter 13 from bottom to top, the top of the second tubular reactor 10 is installed with a second heat exchange medium outlet pipe 14, and the outer wall of the second heat exchange medium outlet pipe 14 is installed with a second outlet temperature transmitter 15.

[0020] In this embodiment: when in use, by starting the first delivery pump 1 and the second delivery pump 2, the materials can be mixed and delivered to the first tubular reactor 4. At this time, the first heat exchange medium inlet pipe 5 can pass the heat exchange medium into the first tubular reactor 4, and the first medium flow meter 6 and the first inlet temperature transmitter 7 can monitor the flow rate and temperature of the heat exchange medium. Then the heat exchange medium flows out from the first heat exchange medium outlet pipe 8. At this time, the first outlet temperature transmitter 9 can monitor the temperature of the outflowing heat exchange medium. Then, by starting the third delivery pump 3, the materials at the outlet of the first tubular reactor 4 can be mixed and delivered to the second tubular reactor 10 for heat exchange. At this time, the second heat exchange medium inlet pipe 11 can pass the heat exchange medium into the second tubular reactor 10, and the second medium flow meter 12 and the second inlet temperature transmitter 13 can monitor the flow rate and temperature of the heat exchange medium. When the heat exchange medium flows out from the second heat exchange medium outlet pipe 14, the second outlet temperature transmitter 15 can monitor the temperature of the outflowing heat exchange medium. Finally, the reaction liquid leaves the second tubular reactor 10 and enters the receiving tank 16 for collection;

[0021] When the continuous reaction is in a stable state, the values ​​of each sensor are recorded, and the PLC system is used to measure and record the data, so that automatic calculation can be achieved through computer software, thereby calculating the heat release rate of the first tubular reactor 4 and the second tubular reactor 10 through heat balance.

[0022] As a technical optimization solution of the utility model, a second delivery pump 2 is arranged below the first delivery pump 1, and the second delivery pump 2 is connected to the pipeline between the first delivery pump 1 and the first tubular reactor 4 through a pipeline.

[0023] In this embodiment, by providing the second delivery pump 2, the second delivery pump 2 and the first delivery pump 1 can deliver the material to the interior of the first tubular reactor 4 for heat exchange operation.

[0024] As a technical optimization solution of the utility model, a third delivery pump 3 is arranged below the second delivery pump 2, and the third delivery pump 3 is connected with the pipeline between the first tubular reactor 4 and the second tubular reactor 10 through a pipeline.

[0025] In this embodiment, by providing a third delivery pump 3, it is convenient to deliver the material to the second tubular reactor 10, so as to perform a second heat exchange operation.

[0026] As a technical optimization solution of the present invention, the outer side wall of the second tubular reactor 10 is connected to a receiving tank 16 through a pipeline.

[0027] In this embodiment, a receiving tank 16 is provided to facilitate the collection of the heat exchanged materials.

[0028] Working principle: First, when using the device, first connect the device to an external power supply, a PLC controller, and a computer, and connect the first delivery pump 1, the second delivery pump 2, and the third delivery pump 3 to the external material pipeline, and then connect the first heat exchange medium inlet pipe 5, the second heat exchange medium inlet pipe 11, the first heat exchange medium outlet pipe 8, and the second heat exchange medium outlet pipe 14 to the external heat exchange medium pipeline, and then start the first delivery pump 1 and the second delivery pump 2 to mix and deliver the materials to the first tubular reactor 4. At this time, the first heat exchange medium inlet pipe 5 can pass the heat exchange medium into the first tubular reactor 4, and the first medium flowmeter 6 and the first inlet temperature transmitter 7 can monitor the flow and temperature, then the heat exchange medium flows out from the first heat exchange medium outlet pipe 8, at this time the first outlet temperature transmitter 9 can monitor the temperature of the outflowing heat exchange medium, then by starting the third delivery pump 3, the materials from the outlet of the first tubular reactor 4 can be mixed and transported to the second tubular reactor 10 for heat exchange, at this time the second heat exchange medium inlet pipe 11 can pass the heat exchange medium into the second tubular reactor 10, and the second medium flow meter 12 and the second inlet temperature transmitter 13 can monitor the flow and temperature of the heat exchange medium, when the heat exchange medium flows out from the second heat exchange medium outlet pipe 14, the second outlet temperature transmitter 15 can monitor the temperature of the outflowing heat exchange medium, and finally the reaction liquid leaves the second tubular reactor 10 and enters the receiving tank 16 for collection;

[0029] When the continuous reaction is in a stable state, the values ​​of each sensor are recorded. Taking the first tubular reactor 4 as an example, the flow rates of the first delivery pump 1 and the second delivery pump 2 are Fa and Fb, the room temperature is rt, the specific heat of the reaction medium is Cr, the specific gravity is ρr, the flow rate of the first heat exchange medium inlet pipe 5 is Fj, the temperature detected by the first inlet temperature transmitter 7 is Tj1, the temperature monitored by the first outlet temperature transmitter 9 is Tj2, the specific heat of the heat exchange medium is Cj, the specific gravity of the heat exchange medium is ρj, and the data are measured and recorded using the PLC system, according to the formula;

[0030] Tj2-Tj1=ΔTj, Tj1-rt=ΔTr

[0031] Qr=Fj*Cj*ρj*ΔTj+(Fa+Fb)*Cr*ρr*ΔTr

[0032] Automatic calculation can be achieved through computer software, whereby the heat release rate of the first tubular reactor 4 can be calculated through heat balance, and the heat release rate of the second tubular reactor 10 can be calculated according to the above method.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tubular reaction calorimeter, comprising a first delivery pump (1), characterized in that: The first delivery pump (1) is connected to a first tubular reactor (4) through a pipeline; a first heat exchange medium inlet pipe (5) is installed at the bottom of the first tubular reactor (4); a first medium flow meter (6) and a first inlet temperature transmitter (7) are installed on the outer wall of the first heat exchange medium inlet pipe (5) in order from bottom to top; a first heat exchange medium outlet pipe (8) is installed at the top of the first heat exchange medium inlet pipe (5); and a first outlet temperature transmitter (9) is installed on the outer wall of the first heat exchange medium outlet pipe (8); The outer wall of the first heat exchange medium outlet pipe (8) is connected to the second tubular reactor (10) through a pipeline, the bottom of the second tubular reactor (10) is connected to the second heat exchange medium inlet pipe (11), the outer wall of the second heat exchange medium inlet pipe (11) is installed with a second medium flow meter (12) and a second inlet temperature transmitter (13) in sequence from bottom to top, the top of the second tubular reactor (10) is installed with a second heat exchange medium outlet pipe (14), and the outer wall of the second heat exchange medium outlet pipe (14) is installed with a second outlet temperature transmitter (15).

2. A tubular reaction calorimeter according to claim 1, characterized in that: A second delivery pump (2) is arranged below the first delivery pump (1), and the second delivery pump (2) is connected to a pipeline between the first delivery pump (1) and the first tubular reactor (4) through a pipeline.

3. A tubular reaction calorimeter according to claim 2, characterized in that: A third delivery pump (3) is arranged below the second delivery pump (2), and the third delivery pump (3) is connected to the pipeline between the first tubular reactor (4) and the second tubular reactor (10) through a pipeline.

4. A tubular reaction calorimeter according to claim 1, characterized in that: The outer side wall of the second tubular reactor (10) is connected to a receiving tank (16) via a pipeline.

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