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Kitchen garbage treatment system combining supercritical water evaporating method with hydrothermal method

A technology for supercritical water gasification and kitchen waste, which is applied in gasification process, granular/powder fuel gasification, bulk chemical production, etc. The problem of high content, to achieve high hydrogen content, high calorific value, to meet the huge annual output and the effect of increasing year by year

Inactive Publication Date: 2019-11-15
ZHEJIANG UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The applicant once applied for an invention patent entitled "A Method for Quickly Treating Food Waste and Co-producing High-value Gas and Biochar" (publication number: CN108690660A), providing a continuous treatment method using supercritical water gasification technology The method of food waste can efficiently and continuously realize the treatment and energy conversion of food waste. Due to the high content of organic matter in food waste, it requires a long reaction time and the gasification efficiency is low. In order to solve the above problems, a proposed A system for treating food waste with supercritical water gasification combined with hydrothermal method, wherein the hydrothermal treatment uses high-temperature liquid water as the reaction medium and reactant, and the high-temperature hydrothermal process can eliminate the influence of microorganisms, and has high energy and high reaction speed Fast, large material throughput, convenient feeding, high product separation efficiency, high salt solubility, friendly reaction environment and short reaction cycle, etc.

Method used

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  • Kitchen garbage treatment system combining supercritical water evaporating method with hydrothermal method

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Embodiment 1

[0024] The food waste collected from the city removes solid inorganic matter, such as bones, beverage boxes and lunch boxes, etc. in the pretreatment unit, and then undergoes crushing and beating before replenishing water. The replenishing water comes from the liquid product obtained after the whole process of treatment. The pretreated raw material exchanges heat with the high-temperature product from the supercritical water gasification unit in the heat exchange unit. The heat exchange unit contains auxiliary heating devices and temperature control devices. After reaching 200 ° C, it enters the hydrothermal treatment unit Perform hydrothermal pretreatment. The raw material after hydrothermal pretreatment is heated to 550°C in the heating unit and then sent to the supercritical water gasification treatment unit by high-pressure pump for supercritical water gasification treatment. The processed product is exchanged with the pretreated raw material in the heat exchange unit heat...

Embodiment 2

[0026] The food waste collected from the city removes solid inorganic matter, such as bones, beverage boxes and lunch boxes, etc. in the pretreatment unit, and then undergoes crushing and beating before replenishing water. The replenishing water comes from the liquid product obtained after the whole process of treatment. The pretreated raw material exchanges heat with the high-temperature product from the supercritical water gasification unit in the heat exchange unit. The heat exchange unit contains auxiliary heating devices and temperature control devices. After reaching 250 ° C, it enters the hydrothermal treatment unit Perform hydrothermal pretreatment. The raw material after hydrothermal pretreatment is heated to 600°C in the heating unit and then sent to the supercritical water gasification treatment unit by high-pressure pump for supercritical water gasification treatment. The processed product is exchanged with the pretreated raw material in the heat exchange unit heat...

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Abstract

The invention discloses a kitchen garbage treatment system combining a supercritical water evaporating method with a hydrothermal method. The kitchen garbage treatment system combining the supercritical water evaporating method with the hydrothermal method comprises a kitchen garbage pretreatment unit, a heat exchange unit, a hydrothermal method treatment unit, a heating unit, a supercritical water evaporating treatment unit, a gas-liquid separation unit and a solid-liquid separation unit; after kitchen garbage is treated by the pretreatment unit, water is replenished, heat exchange is carriedout between the kitchen garbage and a high-temperature product from the supercritical water evaporating unit in the heat exchange unit, after raw materials subjected to hydrothermal pretreatment areheated in the heating unit, supercritical water evaporating treatment is carried out, combustible synthesis gas and a solid-liquid mixture are obtained after the product subjected to heat exchange istreated through the gas-liquid separation unit, and a liquid product and solid residues are obtained after the combustible synthesis gas and the solid-liquid mixture enter the solid-liquid separationunit. In the treatment process, the kitchen garbage can be rapidly reduced, the treatment time is greatly shortened, and the generated combustible synthesis gas has high hydrogen content and high heating value.

Description

technical field [0001] The patent of the invention belongs to the technical field of kitchen waste treatment, and relates to a kitchen waste treatment system combined with a supercritical water gasification method and a hydrothermal method. Background technique [0002] Kitchen waste is mainly the waste generated during the daily life of residents and food processing enterprises. Food waste has a high water content (70%-90%), high organic matter content, high oil and inorganic salt content, and high nutritional content. Abundant, easy to acidify and spoil, breed harmful bacteria and microorganisms, and pose a huge threat to nature and the living environment. The annual output of kitchen waste in my country is huge, accounting for 30%-60% of domestic waste in my country, and the treatment status is not optimistic. Some kitchen waste is mixed with domestic waste for treatment. [0003] The basic idea for the treatment of kitchen waste is to realize the recycling, harmlessness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/48
CPCC10J3/48C10J2300/12Y02P20/54
Inventor 严密苏红才周志昊田心怡杜伟金松洲冯闳宇
Owner ZHEJIANG UNIV OF TECH