Internal and external heat type low-temperature dry distillation system and process

By using an internal and external heating low-temperature dry distillation system, combined with the coaxial rotating structure of the drying chamber and the dry distillation chamber and the circulation of the heat carrier, the problems of low heat transfer efficiency and energy loss in low-temperature dry distillation technology are solved, realizing the efficient resource utilization and environmental and economic benefits of low-quality solid fuels.

CN121950329APending Publication Date: 2026-05-01FUSHUN MINING IND GROUP
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Patent Information

Application Number
CN202610138223.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-31
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing low-temperature dry distillation technology is difficult to adapt to set particulate raw materials, has low heat transfer efficiency, serious energy loss, low system integration, and poor resource, environmental and economic efficiency.

Method used

The system employs an internal and external parallel heating low-temperature dry distillation system, combining the coaxial rotating structure of the drying chamber and the dry distillation chamber. It utilizes a heat carrier remixing device to achieve solid heat carrier circulation, and combines the radiation and conduction heat transfer of high-temperature hot flue gas to integrate drying, dry distillation, and combustion processes into a single reactor for waste heat recovery and product separation.

Benefits of technology

It improves heat transfer efficiency, reduces energy loss, enhances system integration, enables efficient resource utilization of low-quality solid fuels, and reduces operating costs and pollutant emissions.

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Abstract

The invention discloses an internal and external simultaneous heating type low-temperature dry distillation system and process, which are suitable for 0-30mm set particle solid raw materials (the low-rank coal is 0-50mm) and can be applied to the fields of oil shale dry distillation, lignite upgrading and the like, and products comprise coke, semi-coke, tar and dry distillation gas. The core of the system is a horizontal rotary sleeve type dry distillation furnace, a drying bin and a dry distillation bin which are coaxial are arranged in the horizontal rotary sleeve type dry distillation furnace, and an annular space is formed by an outer cylinder and an inner bin. High-temperature hot flue gas in the annular space is subjected to radiation and conduction heat transfer, and hot slag is backmixed according to the proportion of 1 / 4-1 / 3 of materials in the bin, so that direct heat transfer is achieved; heat energy is utilized in a gradient mode, waste heat is subjected to gas-solid heat exchange, and fluid is mixed and recycled. According to the process, drying, destructive distillation and combustion are integrated in one furnace, energy output loss of a traditional process is avoided, generation of nitric oxide is inhibited through low-oxygen combustion, and moisture removed through drying can be recycled. The heat efficiency is high, integration is high, the operation and maintenance cost is low, and efficient resource utilization of low-quality solid raw materials is achieved.
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