Continuous carbonization furnaces typically use a variety of different types of fuels, and the specific selection depends on the design and operational requirements of the furnace, as well as the available resources. Here are some common fuel choices:

1. Biomass fuel: Biomass fuel includes plant-based raw materials such as wood, sawdust, sawdust, straw, sugarcane bagasse, etc. These fuels are usually renewable and can be burned in a continuous carbonization furnace to generate heat energy for the carbonization process. Biomass fuels have a relatively small impact on the environment because the amount of carbon dioxide they release during combustion is equivalent to the amount of carbon dioxide they absorb.

2. Coal: Some carbonization furnaces may use coal as the main fuel. Coal has a high calorific value, so it can provide sufficient heat to maintain the temperature of the carbonization process. However, the combustion of coal releases a large amount of carbon dioxide and other pollutants, so there are some environmental issues.

3. Natural gas: Natural gas is a clean fuel commonly used in carbonization furnaces. It produces relatively less exhaust gas during combustion, has a high calorific value, and can provide a stable combustion temperature.

4. Diesel and liquefied petroleum gas (LPG): Diesel and LPG can also be used as fuels for carbonization furnaces. They provide high calorific value and relatively clean combustion.

5. Electricity: Some carbonization furnaces can also maintain the required temperature through electric heating, without using traditional fuels. This method is usually cleaner, but may require higher electricity costs.

The selection of fuel should consider cost, environmental performance, availability, and the design and operational requirements of the carbonization furnace. When selecting fuel types, it is also necessary to comply with local environmental regulations and safety standards to ensure the safety and environmental friendliness of the production process.