Pyrolysis and incineration are two completely different processes. Incineration is an exothermic process, and pyrolysis needs to absorb a lot of heat. The main products of incineration are carbon dioxide and water, while the main products of pyrolysis are combustible low-molecular compounds: gaseous hydrogen, methane, carbon monoxide; liquid methanol, acetone, acetic acid, acetaldehyde and other organic substances, tar, solvent oil, etc. The solid ones are mainly coke and carbon black.
The pyrolysis method uses the thermal instability of the organic matter in the garbage to heat and distill it under anaerobic or hypoxic conditions to crack the organic matter. After condensation, various new gases, liquids and solids are formed, and fuel is extracted from it. The process of oil and combustible gas. The pyrolysis yield depends on the chemical structure, physical form of the raw materials, and the temperature and speed of pyrolysis.
The thermal decomposition process has different pyrolysis methods due to differences in heating methods, product shapes, and pyrolysis furnace structure. According to the pyrolysis temperature, above 1000ºC is called high temperature pyrolysis, 600-700ºC is called medium temperature pyrolysis, and below 600ºC is called low temperature pyrolysis. According to different heating methods, it is divided into direct heating method and indirect heating method. Direct heating method refers to the direct combustion of waste parts, or the provision of air, oxygen-enriched or pure oxygen to the pyrolysis reactor as supplementary fuel. Pure oxygen as a catalyst will produce CO2, H2O and other gases, which are mixed in the pyrolysis combustible gas, dilute the combustible gas, and reduce the thermal effect of the pyrolysis gas. Using air as a catalyst contains a large amount of N2, which dilutes the combustible gas and greatly reduces the calorific value of the pyrolysis combustible gas.
