A warm-type saturated biochar thermal regeneration process

The warm-type biochar regeneration process of biogas residue, which involves multi-gradient pretreatment, segmented pyrolysis and composite activation, solves the problems of high carbon loss rate, easy pore blockage and poor adaptability in the biochar regeneration process, achieving efficient regeneration and applicability to multiple scenarios, reducing energy consumption and avoiding secondary pollution.

CN122126848APending Publication Date: 2026-06-02SHANGHAI MODERN ENG VOCATIONAL COLLEGE (SHANGHAI PETROCHEMICAL IND SCHOOL)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI MODERN ENG VOCATIONAL COLLEGE (SHANGHAI PETROCHEMICAL IND SCHOOL)
Filing Date
2026-04-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing regeneration technologies suffer from problems such as high carbon loss rate, easy pore blockage, low performance recovery rate, poor adaptability, and high risk of secondary pollution when processing biochar from sludge with high ash content and fragile pore structure. It is difficult to achieve high regeneration efficiency, low operating energy consumption, and adaptability to multiple scenarios.

Method used

The process involves multi-gradient raw material pretreatment, segmented low-temperature preheating desorption, precise temperature-controlled medium-temperature pyrolysis, and composite activator wet activation. Combined with tail gas recirculation anaerobic cooling and waste heat recovery design, it achieves efficient regeneration of biochar.

Benefits of technology

It significantly reduces carbon loss rate, improves pore structure recovery efficiency, enhances surface property compatibility, enables efficient recycling of biochar, reduces energy consumption and avoids secondary pollution, and is suitable for various scenarios such as wastewater treatment and soil improvement.

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Abstract

This invention relates to the field of biochar treatment from sludge, specifically a warm-type saturated biochar thermal regeneration process, comprising four steps: pretreatment, staged pyrolysis, composite activation, and post-cooling treatment. The pretreatment stage sequentially completes impurity screening, water washing and deashing, gradient drying, and particle size uniformization, reducing the risk of carbon loss. The staged pyrolysis stage uses stepped heating zones to remove adsorbates with different boiling points, and real-time monitoring of the tail gas concentration controls the pyrolysis time, ensuring complete desorption while preventing skeletal burn-off. The composite activation stage uses a mixture of steam and carbon dioxide as an activator, allowing for adjustable proportions to control pore distribution, and can also incorporate ammonia to achieve directional modification of surface functional groups. This invention effectively reduces carbon loss during regeneration, improves pore recovery efficiency and regenerated biochar performance, is suitable for various reuse scenarios, significantly reduces operating costs and environmental risks, and is suitable for widespread application in the fields of solid waste resource utilization and environmental remediation.
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