Small scale experimental high-temperature tube furnace fluidization experiment

Small scale experimental high-temperature tube furnaces can achieve fluidization experiments by customizing vertical fluidized bed structures. By combining fluidized bed technology with the advantages of tube furnaces, it can meet the needs of powder material processing, multiphase catalytic reactions, etc. However, attention should be paid to equipment customization capabilities, fluidization uniformity, and operational complexity. The following is a specific analysis:

1. Feasibility of Conducting Fluidization Experiments on Small High Temperature Tube Furnaces
Technical principle adaptability
The vertical fluidized bed tube furnace enters from the bottom through gas, and after being evenly distributed by the distribution plate, the solid particle layer is fluidized at a specific flow rate. At this point, the particles are vigorously mixed and suspended in the airflow, forming a liquid like flow characteristic. This state is maintained by precise control of gas flow rate and pressure, ensuring uniform expansion of the particle bed and no dead corners. If a small high-temperature tube furnace adopts a vertical design, fluidization experiments can be carried out by combining this principle. For example, by optimizing the tube bundle layout and gas flow path, powder materials can be uniformly heated and reacted at high temperatures.
Core Advantage Support
Enhanced heat transfer and reaction efficiency: In fluidized state, the contact area between gas and solid particles is increased by 10-100 times compared to a fixed bed, significantly enhancing heat conduction and chemical reaction rate. The vigorous movement of particles ensures uniform temperature distribution in the bed, with a temperature difference controlled within ± 2 ℃, while promoting the diffusion of reactants and desorption of products. It is particularly suitable for multiphase catalytic reactions and powder material processing.
Advantages of vertical tube structure: The vertical design utilizes gravity assisted material transportation to reduce the risk of blockage, while achieving uniform temperature distribution through optimized tube bundle layout. The vertical structure also facilitates gas flow control, reduces system resistance, and is suitable for operating small equipment in laboratory environments.

2. Application scenarios of fluidized bed experiments in small high-temperature tube furnaces
Powder material processing
In the field of materials science, fluidization experiments can be used to study the thermal stability, phase transition process, or surface modification of powder materials. For example, by using fluidized bed technology to react metal powder with gas at high temperatures, nanoscale oxide or carbide particles can be prepared. The precise temperature control (± 1 ℃) and uniform heating characteristics of a small tube furnace can ensure experimental repeatability.
Multiphase catalytic reaction
In chemical engineering, fluidization experiments can simulate industrial catalytic reaction conditions and study catalyst activity and selectivity. For example, in petroleum cracking or waste gas treatment, the catalyst particles are fully contacted with the reaction gas through a fluidized bed, and the rapid heating (≤ 20 ℃/min) and atmosphere control (such as oxygen and hydrogen mixed gas) of a small tube furnace can optimize the reaction path.
Application in the field of environmental protection
Fluidization experiments can be used for sample combustion analysis to determine organic matter content or pollutant degradation efficiency. For example, in waste treatment research, solid waste is reacted with oxidizing gases at high temperatures through fluidized beds. The vacuum/pressure control system of a small tube furnace (working vacuum degree ≥ -0.05MPa, working pressure ≤ 0.05MPa) can simulate different oxidation environments.

3. Limitations of Conducting Fluidization Experiments in Small High Temperature Tube Furnaces
Equipment customization requirements
Standard small high-temperature tube furnaces are mostly horizontal or ordinary vertical structures. If fluidization experiments need to be conducted, customized vertical fluidized bed modules are required, including gas distribution plates, fluidization section tube bundles, and particle recovery systems. This may increase equipment costs and delivery cycles, such as the need to communicate configuration requirements with technical personnel for customized touchscreen vertical fluidized bed tube furnaces.
Fluidization uniformity challenge
Due to size limitations, small fluidized bed heights and diameters of small equipment may result in uneven gas distribution or particle agglomeration. For example, when processing micron sized powders, improper control of gas flow rate can lead to insufficient local fluidization or excessive spraying, which can affect the accuracy of experimental results.
Operational complexity
The fluidization experiment requires simultaneous control of gas flow rate (0-10L/min), temperature (such as continuous operation at 1350 ℃), and pressure (micro positive pressure 0-0.1MPa), which requires high skills from the operators. For example, when switching the atmosphere, it is necessary to first evacuate to within 20Pa, and then introduce high-purity gas. The operation steps are cumbersome and must strictly follow safety regulations.