A methodology for the removal of the harmful components of ash from urban/industrial wastes and sludges from the sewage treatment plants is invented. The harmful components are alkaline metals, chlorine, sulphur, zinc, lead, and chromium. They are removed before the thermochemical conversion and therefore the corrosion problems, scaling/deposition, ash agglomeration, dioxin and furan emissions, alkaline metal, chlorine, sulphur emissions are minimized if not diminished. The emissions of heavy metals such as zinc, lead, copper, and chromium are reduced. The removal is achieved with prepyrolysis/pregasification at 250-320° C. for 5 min to 2 h of urban/industrial wastes and sludges from the sewage treatment plants. Then the prepyrolyzed/pregasified sample is washed with a 0.5%-5% weight basis aqueous calcium acetate and/or magnesium acetate and/or aluminum acetate solution. These acetate salts can be mixed in a proportion of 0% to 100% to form an active salt which is used for the preparation of the aqueous solution.

A methodology for the removal of the harmful components of ash from urban/industrial wastes and sludges from the sewage treatment plants is invented. The harmful components are alkaline metals, chlorine, sulphur, zinc, lead, and chromium. They are removed before the thermochemical conversion and therefore the corrosion problems, scaling/deposition, ash agglomeration, dioxin and furan emissions, alkaline metal, chlorine, sulphur emissions are minimized if not diminished. The emissions of heavy metals such as zinc, lead, copper, and chromium are reduced. The removal is achieved with prepyrolysis/pregasification at 250-320° C. for 5 min to 2 h of urban/industrial wastes and sludges from the sewage treatment plants. Then the prepyrolyzed/pregasified sample is washed with a 0.5%-5% weight basis aqueous calcium acetate and/or magnesium acetate and/or aluminum acetate solution. These acetate salts can be mixed in a proportion of 0% to 100% to form an active salt which is used for the preparation of the aqueous solution.

The present disclosure relates to a method for continuously preparing a pulverulent material having a calorific power greater than the calorific power of the initial biomass, the method comprising a steam cracking step, wherein the initial biomass consists of elements having a grain size distribution of between P25 and P100, having a humidity of less than 27%, and directly subjected to a steam cracking treatment.

A high-efficiency food waste carbonization process using a carbonizer specially designed to function at a specific range of temperatures to work efficiently, with minimal energy input and designed to reduce volume and to produce charcoal that may be used as a fuel. The invention is designed to work with high-moisture materials such as food waste.

A high-efficiency food waste carbonization process using a carbonizer specially designed to function at a specific range of temperatures to work efficiently, with minimal energy input and designed to reduce volume and to produce charcoal that may be used as a fuel. The invention is designed to work with high-moisture materials such as food waste.

Systems of producing hydrogen and biochar from biomass assisted by iron and steel slag extract include: a pretreatment system that the reactants, including the biomass, iron-based catalyst and alkaline reagent, are pretreated and fully mixed at specific ratios in the pretreatment system; thermal reactor that the mixed reactants from the pretreatment device are transferred into and fully reacted in the thermal reactor; a solid residue collector that the solid residue is collected by the solid residue collector at the discharge outlet of the thermal reactor after the reacted mixture is separated; a gas collection system that he generated hydrogen-based gas is collected by the gas collection system from the exhaust port of the thermal reactor.

Systems of producing hydrogen and biochar from biomass assisted by iron and steel slag extract include: a pretreatment system that the reactants, including the biomass, iron-based catalyst and alkaline reagent, are pretreated and fully mixed at specific ratios in the pretreatment system; thermal reactor that the mixed reactants from the pretreatment device are transferred into and fully reacted in the thermal reactor; a solid residue collector that the solid residue is collected by the solid residue collector at the discharge outlet of the thermal reactor after the reacted mixture is separated; a gas collection system that he generated hydrogen-based gas is collected by the gas collection system from the exhaust port of the thermal reactor.

A method for preparing biochar, including steps as follows: dosing: putting pre-crushed biomass into a reactor; charring conversion: heating the reactor to a certain temperature and pressure, and putting an active group-containing active agent containing 1% to 5% by mass of biomass and a catalyst containing 1% to 10% by mass of biomass (or putting the catalyst first and then putting the active agent) into the reactor to perform solid solution charring on the biomass; and cooling: after the charring conversion is completed, cooling the reactor to 40° C. or lower to obtain the biochar. Feedstocks are abundant and cheap, farmland biomass waste is reused, and the active group-containing active agent is added in biomass charring, which can effectively inhibit side reactions and coordinate with the catalyst to perform solid solution charring on the biomass, thereby improving a biochar conversion rate and making the charring process clean and environmentally friendly.

A system and method for torrefying a combination of biomass and biochar colloidal dispersion is provided.

A system and method for torrefying a combination of biomass and biochar colloidal dispersion is provided.