Biomass pyrolysis equipment

Biomass is a clean and renewable energy source, and rapid pyrolysis technology is an important way to utilize biomass. Pyrolysis is the process of using thermal energy to break down high molecular weight organic matter and transform it into low molecular weight substances with fewer carbon atoms. Biomass pyrolysis is the thermal degradation process of biomass that produces three products, liquid, gas, and solid, under completely anaerobic conditions.

In traditional waste incineration, the direct combustion method is prone to produce dioxins, which require four basic conditions for their formation: chlorine, oxygen, lower temperature, and catalyst; There are two conditions for the formation of dioxins: low-temperature production inside the furnace and synthesis of flue gas outside the furnace. Chlorine elements such as plastics in garbage are more likely to produce dioxins at temperatures of 250-350 ℃, and they increase with the increase of oxygen concentration. Organic or inorganic chlorine gas and catalysts (copper, iron and other oxides) in flue gas fly ash catalyze the synthesis of dioxins. Therefore, the standard GB 18485-2014 for pollution control of municipal solid waste incineration requires the furnace temperature to be ≥ 850 ℃, and requires a sharp decrease in flue gas temperature and a reduction in copper, iron and other oxides in the waste.

Traditional waste incineration is a direct oxygen enriched incineration method, which involves burning waste in a furnace at around 1000 ℃ without any hierarchical oxygen enriched flames. Although dioxins are cracked at high temperatures, they are also regenerated into dioxins during the flue gas emission process under the catalytic action of HCL and CuCL2 elements. Moreover, smoke and dust are directly emitted into the environment, polluting the environment and often causing mass incidents.

The low-temperature and oxygen deficient pyrolysis device for municipal solid waste in urban communities and residential areas is the opposite of direct incineration. It uses anaerobic or extremely low oxygen pyrolysis without open flame combustion. Under low-temperature and oxygen deficient conditions, dioxins cannot be synthesized (eliminating the synthesis conditions of dioxins), and copper, aluminum, iron metals, etc. in the waste are not easily oxidized under low-temperature and oxygen deficient conditions, making it difficult to produce dioxins as catalysts.

Thermal decomposition of municipal solid waste in urban communities and residential areas is the process of producing combustible gases and charcoal from the waste under thermal conditions that isolate oxygen or have little oxygen, without emitting dust or harmful gases.