Method for treating kitchen waste through hydrothermal carbonization

Abstract

The invention discloses a device for treating kitchen waste through hydrothermal carbonization. The device comprises a solid-liquid separation device, a mechanical crushing device, a hydrothermal carbonization system, a high-temperature drying device and a packaging and collecting device. The hydrothermal carbonization system is arranged at one side of the solid-liquid separation device; the mechanical crushing device is located between the solid-liquid separation device and the hydrothermal carbonization system; the packaging and collecting device is arranged at the other side of the hydrothermal carbonization system; the high-temperature drying device is located between the hydrothermal carbonization system and the packaging and collecting device; and the solid-liquid separation device,the mechanical crushing device, the hydrothermal carbonization system, the high-temperature drying device and the packaging and collecting device are sequentially connected. Filtered and compressed residues are converted into novel biomass fuel with high calorific value and low pollution through a hydrothermal carbonization technology, so that waste is turned into wealth to the greatest extent, traditional fuel is saved and supplied to a power plant for use, and cyclic utilization of resources is realized; and in addition, the technology is applied to engineering practice, and small movable efficient kitchen waste treatment equipment is developed.

Description

technical field [0001] The invention belongs to the technical field of kitchen waste treatment, and in particular relates to a method for hydrothermal carbonization treatment of kitchen waste. Background technique [0002] Food waste is a general term for food waste and kitchen waste, which has the characteristics of high content of water, organic matter, oil, salt, etc., and is perishable. It is the main component of urban and rural domestic waste, accounting for about 37-62%; as people With the change of diet structure and the improvement of living standards, the output of kitchen waste is increasing day by day; in 2018, the production of kitchen waste in China was about 108 million tons, with an average daily production of 290,000 tons; Improperly affecting food safety, and even endangering human health, therefore, the harmless treatment of kitchen waste and its resource utilization are increasingly valued; in recent years, with the increase in the output of kitchen waste...

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Problems solved by technology

[0002] Food waste is a general term for food waste and kitchen waste, which has the characteristics of high content of water, organic matter, oil, salt, etc., and is perishable. It is the main component of urban and rural domestic waste, accounting for about 37-62%; as people With the change of diet structure and the improvement of living standards, the output of kitchen waste is increasing day by day; in 2018, the production of kitchen waste in China was about 108 million tons, with an average daily production of 290,000 tons; Improperly affecting food safety, and even endangering human health, therefore, the harmless treatment of kitchen waste and its resource utilization are increasingly valued; in recent years, with the increase in the output of kitchen waste, the treatment technology of kitchen waste has been continuously matured and improved; In rural areas, food waste is usually used as livestock feed without disinfection, or as agricultural organic fertilizer after composting; in cities, it is usually treated together with domestic waste before waste classification, mainly landfill and incineration; waste classification After implementation, anaerobic digestion technology is usually used for energy recovery, or biological strains are used for aerobic fermentation as agricultural feed; the construction of food waste treatment facilities in China started relatively late, and the most common domestic treatment technology is mechanical crushing method, incineration method, landfill method, such treatment methods seriously waste resources, may also pollute the environment and affect human health; at this stage, China's food waste treatment technology is becoming more mature, such as aerobic composting, anaerobic digestion, etc.

[0003] Hydrothermal Carbonization (Hydrothermal Carbonization) is a biomass value-added treatment method that has developed rapidly in recent years. It uses water as a reaction solvent, at <375°C (usually 150-280°C) temperature and a certain pressure (14-276bar) Carbon-rich solid products are synthesized in the container, and biomass raw materials are converted into multifunctional carbon-based materials (hydrothermal charcoal) with high added value. In terms of energy density, the quality of hydrothermal charcoal is close to peat and lignite, and can be used as a composite The direct combustion of solid fuel can also be applied to many fields such as soil improvement, CO2 fixation, pollutant adsorption, etc.; ) still has a lot of room for improvement

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