Two-step organic waste treatment system and method based on supercritical/subcritical water technology

Abstract

The invention discloses a two-step organic waste treatment system and method based on supercritical / subcritical water technology. The two-step organic waste treatment system comprises a subcritical hydrolysis reactor, a supercritical water gasification reactor, a material conveying apparatus communicated with the bottom of the subcritical water gasification reactor, an oxidizing agent apparatus, a residue discharging apparatus, a material heat exchanger, a backheating apparatus and a product collection apparatus. Organic waste is hydrolyzed into micromolecular products through a subcritical hydrolysis reaction, so requirements on subsequent gasification reaction conditions are lowered, and harmless treatment of organic waste is realized; organic waste is completely converted into clean energy like H2 by supercritical water gasification, so the goal for sustainable efficient recycling of organic waste is achieved; an oxidizing agent is added in the reaction process of supercritical water, so an in-situ heat source is provided for gasification, a gasification rate is increased and energy consumption is reduced; and through directional adjustment and control of technological parameters of subcritical hydrolysis and supercritical water gasification, cooperative effect of the two-step method can be realized, and the gasification conversion rate of organic waste is greatly improved.

Description

technical field [0001] The present invention relates to a treatment system for organic waste, in particular to a system based on ultra- A two-step treatment system and method for organic waste in a subcritical water process. Background technique [0002] At present, the mainstream methods of organic waste treatment (feed, anaerobic digestion technology, composting, etc.) High fat, high salt content of kitchen waste, etc.), resulting in the difficulty of biochemical reactions to adapt to the temporal and spatial differences of organic waste components, making the reaction process unstable and other defects. For this reason, the treatment plant needs to carry out complex and strict pretreatment of organic waste, and the treatment process will bring secondary pollution. [0003] Supercritical water (temperature and pressure are higher than the critical point of water, referred to as SCW) as a new chemical reaction medium has been widely concerned, it has the performance of or...

AI Technical Summary

Problems solved by technology

However, at a lower gasification temperature (250-400°C), the organic matter in the black liquor is difficult to completely gasify

To achieve efficient conversion of waste, the cost of current supercritical water gasification technology is relatively high

[0006] 3) In the supercritical water gasification technology, chemical components such as phenol that are difficult to gasify and transform are easily generated during the low-temperature reaction process, but in the direct supercritical water gasification reaction, it is impossible to control the liquefaction reaction products independently, resulting in medium and low temperature conditions. The conversion rate of refractory organic matter at high concentration is low

Therefore, the two-step method of subcritical water and supercritical water to treat organic waste has many advantages, and can solve the problem of low conversion rate and the need for complete gasification of organic waste that is difficult to treat in the current biochemical reaction. Problems such as high reaction temperature and high energy consumption

However, there are no public reports on the device and method for the two-step treatment of organic waste with subcritical water and supercritical water.

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