A kind of waste derived fuel and its preparation method

Abstract

The invention discloses a preparation method of waste derived fuel. The preparation method comprises the following steps: performing three-phase separation on kitchen wastes to obtain kitchen waste slurry, mixing the obtained kitchen waste slurry with a plant material, and sequentially dehydrating, drying and compressing the obtained mixed materials, wherein the water content of the plant material is less than 20% by weight; the water content of the dried material is less than 30% by weight. By adopting the preparation method disclosed by the invention, kitchen wastes can be easily turned into wealthy and can be prepared into waste derived fuel of which the water content is less than 25% by weight and the heat value is up to 3500-4000 kilocalorie / kg, so that waste treatment on kitchen wastes is achieved, and the resource utilization of the kitchen wastes is also achieved.

Description

technical field [0001] The present invention relates to a waste derived fuel and a preparation method thereof. Background technique [0002] With the continuous improvement of people's lives, the amount of food waste generated is increasing day by day. Generally, solid waste in kitchen waste accounts for about 10% by weight, oils and fats account for 5-10% by weight, and waste water accounts for 75-80% by weight. At present, the main treatment methods for the solid waste in kitchen waste include: filling Burial, incineration, anaerobic fermentation, direct drying as feed, aerobic composting, etc. [0003] Among them, the landfill process is mainly to transport the slurry containing the solid waste part after the three-phase separation of the kitchen waste to the landfill for landfill treatment, but this method has the following defects: 1) It takes up a lot of land and consumes a lot of land acquisition, etc. Expenses; 2) The landfill covers a large area, but the processin...

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Problems solved by technology

[0003] Among them, the landfill process is mainly to transport the slurry containing the solid waste part after the three-phase separation of the kitchen waste to the landfill for landfill treatment, but this method has the following defects: 1) It takes up a lot of land and consumes a lot of land acquisition, etc. Expenses; 2) The landfill covers a large area, but the processing capacity is limited. After the service period expires, a new landfill will still be built, which will further occupy land resources; 3) The seepage of kitchen waste will pollute groundwater and soil, and the garbage The odor generated by stacking seriously affects the air quality, thus forming secondary pollution to the surrounding air and water and soil in a large area; 4) There is no recycling of garbage

[0004] In addition, the incineration process is to directly send the slurry containing the solid waste part of the kitchen waste into the incinerator for incineration treatment. This method has the following defects: 1) The calorific value of the slurry of the kitchen waste after three-phase separation is relatively low. 2) The high moisture content of the slurry of food waste will increase the consumption of incineration fuel and increase the processing cost; 3) The storage of waste in the incineration pit will increase the amount of leached water in the pit

[0005] In addition, the anaerobic fermentation process is to anaerobically ferment the slurry of kitchen waste to recover the generated biogas, and the biogas slurry is subjected to solid-liquid separation treatment, and the biogas residue after solid-liquid separation is mixed with biomass materials such as straw However, this process has the following defects: 1) The investment in anaerobic fermentation treatment project is large, which is not economical; 2) The daily processing of kitchen waste is less than 200 tons, and anaerobic fermentation produces The amount of biogas is small and the income is too low, resulting in an unreasonable input / output ratio

[0006] Among them, the method of directly drying as feed is to make the slurry of kitchen waste through a drier to dry, pulverize, dedust, etc., to make animal feed additives; and this process has the following defects: 1) The slurry of kitchen waste is made of Composed of animal and plant organic matter, animal organic matter enters the food chain again, and there are food safety hazards; 2) The composition of the kitchen waste slurry is complex, containing a large amount of toxic substances (including aflatoxin, heavy metals, etc.), and there are hidden dangers of food poisoning when used by animals

[0007] In addition, the defects in the process of using food waste slurry as aerobic composting are: 1) the pollution of harmful organic matter and heavy metals cannot be well solved, and the harmlessness is not complete; 2) the treatment process is not closed, which is easy to cause secondary pollution Secondary pollution; 3) The quality of organic fertilizers is greatly restricted by the ingredients of kitchen waste, and the market is often not smooth; 4) The composting cycle is long, the area is large, and the sanitary conditions are relatively poor; 5) Part of the kitchen waste Grease and salt, the current composting technology cannot be degraded, and long-term use will aggravate the salinization of the soil