Can a high-temperature vertical tube furnace be used for fluidized bed experiments?

The high-temperature vertical tube furnace can be used for fluidized bed experiments, and its structure and technical characteristics give it significant advantages in fluidized bed experiments. The specific analysis is as follows:

1. Core requirements for fluidized bed experiments
Fluidized bed experiments require materials to exhibit a fluid like state under the action of gas flow, achieving uniform heating and efficient reaction. This process requires the following conditions to be met:
Uniform heating: Avoid local overheating or temperature gradients to ensure reaction consistency.
Efficient heat transfer: Improve heat transfer efficiency and shorten reaction time through gas solid contact.
Atmosphere control: Accurately adjust gas composition (such as inert gas, reducing gas) to suppress side reactions.
Continuous operation: supports continuous material feeding and discharging, adapting to industrial production needs.

2. Adaptability of High Temperature Vertical Tube Furnace
a. Structural advantage: Vertical design promotes fluidization state
Vertical furnace tube: Materials are added from the top, and gas is introduced into the bottom to form a fluidized bed. Gravity and airflow work together to suspend particles and avoid accumulation.
Fluidization uniformity: Fluidized bed technology enables solid particles to exhibit a fluid like state under gas flow, with particles in full contact with the heating surface, thereby improving heat transfer efficiency.
Case: In biomass pyrolysis experiments, a vertical tube furnace introduces nitrogen gas at the bottom to make the material fluidized and uniformly heated, reducing pyrolysis time and increasing product yield.
b. Temperature control: precise adjustment to meet reaction requirements
PID intelligent temperature control: using proportional integral derivative (PID) algorithm, combined with real-time feedback from thermocouples, temperature fluctuations are controlled within ± 1 ℃.
Multi stage program temperature control: supports segmented programming for heating, constant temperature, and cooling to meet the needs of different reaction stages (such as pyrolysis, reduction, sintering).
Case: In the experiment of metal oxide reduction, a vertical tube furnace achieves “step heating” through programmed temperature control, ensuring complete reduction reaction and higher product purity.
c. Atmosphere control: flexibly adjust the gas environment
Dual mode of vacuum and atmosphere: The ultimate vacuum degree can reach 1 × 10 ⁻⁵ Pa, supporting the introduction of gases such as nitrogen, hydrogen, argon, or mixed gases (such as N ₂+H ₂).
Accurate control of gas flow rate: The gas flow rate is regulated by a mass flow meter (MFC) with an accuracy of ± 1% FS to ensure atmosphere stability.
Case: In the catalyst activation experiment, hydrogen gas was introduced into a vertical tube furnace to reduce the catalyst, and the hydrogen flow rate was precisely controlled by MFC to improve the activation efficiency.
d. Efficient and energy-saving: reducing operating costs
Optimization of insulation layer: outer stainless steel shell+middle alumina fiber+inner nano aerogel, which reduces heat loss and has significant energy-saving effect.
Rapid heating: The heating rate of the silicon molybdenum rod heating element reaches 10 ℃/min, shortening the experimental period.
Case: In the ceramic sintering experiment, the vertical tube furnace optimized the insulation layer, reducing energy consumption and operating costs per experiment.

3. Application scenarios and experimental cases
a. Powder experiment
Experimental process: The powder is placed on a porous ceramic plate or porous quartz plate, and nitrogen gas is introduced at the bottom to suspend the powder, followed by high-temperature treatment.
Advantages: Avoid powder clumping, ensure uniform heating, and improve the accuracy of experimental results.
Case: In the synthesis of nanomaterials, a vertical tube furnace uses fluidized bed technology to achieve uniform heating of powder and prepare nanoparticles with narrow particle size distribution.
b. CVD experiment
Experimental process: By precisely controlling the gas flow rate, temperature, and pressure, uniform deposition of powder particles on the surface is achieved.
Advantages: Preparation of high-quality coatings or films, suitable for fields such as semiconductors and optical materials.
Case: In the preparation of graphene, a vertical tube furnace deposits a single layer of graphene on the surface of copper foil through CVD process, with a layer control accuracy of ± 1 layer.
c. Fluidized pyrolysis
Experimental process: Biomass, coal and other materials are fed into a fluidized bed, and fluidized gases (such as nitrogen and air) are introduced at the bottom to decompose into gas, liquid and solid products at high temperatures.
Advantages: Improve pyrolysis efficiency, optimize product quality, suitable for resource recovery and energy conversion.
Case: In the experiment of biomass pyrolysis to produce bio oil, the vertical tube furnace improved the yield and calorific value of bio oil through fluidized pyrolysis technology.

4. Operation precautions
Safety protection: Wear protective gloves and goggles during high-temperature operations to avoid burns; Gas operation requires checking the sealing to prevent leakage.
Parameter control: Adjust gas flow rate, temperature, and pressure according to material properties to ensure stable fluidization state.
Equipment maintenance: Regularly clean furnace tubes and fluidized bed plates to prevent blockages; Check the heating element and temperature control system to ensure stable performance.