What are the classifications of vertical fluidized bed tube furnaces?

　　Vertical fluidized bed tube furnaces can be classified into various types based on their functions, structures, and usage scenarios. The following are specific classifications and characteristics: 1. Classified by temperature and function High temperature sintering type Temperature range: 1600-1700 ℃ (such as a 1700 ℃ vertical fluidized bed tube furnace heated by silicon molybdenum rods). Typical applications: Sintering of silicon carbide and silicon nitride ceramics, synthesis of metal nitrides. Key features: Using high-purity corundum furnace tubes or silicon carbide furnace chambers, high temperature resistance and thermal shock resistance. Medium temperature experimental type Temperature range: 1200 ℃ (such as NBD-LTO1200-25TI type). Typical applications: catalyst preparation, powder surface deposition experiments (such as CVD coating). Key features: Compact size (such as furnace body size of 350 × 390 × 350mm), supporting multiple temperature control curves. Multi temperature zone control type Temperature range: Three temperature zone design (such as NBD-LTO1200-100T3GF-150 type, up to 1150 ℃). Typical applications: gradient sintering, carbon nanotube growth, catalyst modification. Key features: Independent temperature control in each temperature zone, with a temperature difference of ≤± 2 ℃, meeting complex process requirements. 2. Classified by structure and operation mode Vertical Mini Type Structural features: The diameter of the furnace tube is ≤Φ 25mm, and the size of the furnace chamber is Φ 80 × 200mm. Typical application: Laboratory small-scale experiments, such as metal oxide synthesis. Advantages: Small footprint, low energy consumption, and support for 7-inch touch screen operation. Vertical three temperature zone type Structural features: The size of the temperature zone is φ 150 × (200+400+200) mm, with a total length of 1970mm. Typical applications: multi-stage heat treatment (such as gradient annealing, composite material preparation). Advantages: Independent temperature control and support for dynamic curve settings. Fluidized bed specific type Structural features: Built in microporous ceramic plate or porous quartz plate to achieve particle suspension. Typical application: Powder fluidization treatment (such as surface modification of catalyst particles). Advantages: Uniform fluidization, high heat transfer efficiency, and reduced local overheating. 3. Classified by special needs Atmosphere controlled type Typical applications: hydrogen reduction, nitrogen protected sintering. Key features: Equipped with gas mass flow meter, supporting multi-channel gas switching. Vacuum type Typical applications: semiconductor material preparation, high-purity powder synthesis. Key feature: Mechanical pump evacuates to ≤ 10Pa to reduce oxidation pollution. Rapid annealing type Typical applications: post-treatment of metal thin film deposition, semiconductor device processing. Key features: Heating rate of 20 ℃/min, supporting rapid cooling and heating. 4. Classified by technical parameters High precision temperature control type Technical parameters: Temperature control accuracy ± 1 ℃, thermocouple type B or S. Typical applications: semiconductor material growth, precision ceramic sintering. Large capacity type Technical parameters: Inner diameter of furnace tube ≥ Φ 100mm, length ≥ 1000mm. Typical applications: industrial grade powder processing, large-scale catalyst preparation. Modular design type Technical parameters: The temperature range is expandable and supports customized configuration. Typical application: Research institutions with multiple process requirements.