I. Overview The FTL type boiling furnace feeds 0-10mm (controlled at 3-8mm) coal (raw coal after screening) mechanically onto the distributor plate inside the furnace. High-pressure air causes the coal particles and furnace materials to boil. Since the coal particles occupy only about 1% of the furnace material, the large contact area with air and the high relative movement speed during the boiling combustion process result in a longer time from the raw coal entering the furnace to being discharged. This allows for the stable combustion of high-ash, low-calorific-value poor coal, which is difficult to burn thoroughly in other furnace types, achieving a high degree of combustion. Therefore, the uniform temperature and high combustion efficiency are its main advantages:

1. Highly adaptable to various types of fuel, capable of burning poor-quality coal and slag (with a calorific value of 6270 kJ/kg or more)
2. Combustion efficiency exceeds 95%.
3. Uniform heating of the furnace. Long service life, simple fuel preparation.
4. Flexible operation. Good adjustment performance; the furnace heats up quickly, and after a shutdown, it can reach full load operation within 20 to 30 minutes upon restart.
5. Uniform heating with stable temperature, which can increase the output of the dryer by 50-70%, save coal by over 50% compared to other furnaces, and have slag carbon content less than 1%, making it an excellent blending material for cement.
6. Low labor intensity, easy to automate.

II. Technical Performance & Features

1. Pressure equalization chamber with two-stage combustion, featuring a U-shaped combustion section that allows for the separation and collection of unburned fine carbon particles, and also extends the time for their combustion to complete. (When two-stage combustion is not employed, the coal particles entering the furnace should be less than 10mm, or limited to 0-5mm if specified.)

2. The air distribution device utilizes a large pitch variable diameter hood, offering excellent fluidization quality and combustion process, minimizing the impact of uneven air distribution caused by side wall benefits.

3. Utilize a large excess air coefficient to enhance air stirring within the furnace, intensify combustion, ensure complete burning of coal inside, even temperature distribution, and easy control.

4. Employed a rational suspended section structure, with lower airflow velocity, reduced fine ash carryover, and heating flue gas temperatures up to 1050°C, with over 90% of coal particles burned out.

III. Main Technical Parameters