Research and development trend on the complete continuous system for hydrothermal conversion of biomass

doi:10.16085/j.issn.1000-6613.2020-1286

Abstract

Abstract:

The technology of hydrothermal conversion of biomass has the characteristics of good adaptability to feedstock, low cost, and high conversion efficiency, which has a great potential for industrial production of biocrude and chemicals to substitute for fossil fuels. In this paper, the updated research progress of continuous biomasses hydrothermal conversion systems was reviewed. The hydrothermal reactor, as one of the main production links, is the unique one that has achieved a continuous reaction and other links such as feeding and separation have not been achieved yet. It shows that the future production mode should be characterized by high production efficiency, low energy consumption, and environment-friendly, then the commercialization of hydrothermal conversion of biomass could be achieved. To promote the commercialization, a complete continuous system of hydrothermal conversion of biomass is proposed, which could realize complete continuous operation for feedstock pretreatment, feeding/pumping, hydrothermal reaction, and product separation. Meanwhile, this system could realize heat exchange by recycling aqueous products, and higher thermal efficiency and energy saving could be achieved through the process of primary product separation. Furthermore, the discharge of process water would be more eco-friendly through heat recovery and reuse of the aqueous products. Based on the analysis of the R&D progress to the key components in the system, this study provides an enlightenment for the further commercialization of the system.

Key words: hydrothermal conversion, continuous, reactor, high-pressure pump, product separation

摘要：

生物质水热转化技术具有原料适应性好、成本低、转化效率高的特点，使其具有未来工业化生产生物原油和化学品替代化石燃料的巨大潜力。本文综述了目前生物质水热转化连续式系统的研发进展，指出目前研发系统的主要环节部分仅水热反应器基本实现了连续化反应，而其他环节如原料进料、产物分离尚未实现连续化运行。分析表明，未来的生产模式要求具备效率高、能耗低、环保和节能等特点，才能实现商业化。本文提出了一套面向未来的完全连续式生物质水热转化系统模式。该系统可以实现包括生物质原料预处理、喂料/泵送、水热反应及产物分离各环节能完全连续化运行。同时，系统在产物分离过程中通过对关键水相产物反复循环回用进行热交换，实现更高的热效率实现节能；其次，通过水相产物的热量回收和水相产物循环回用实现过程水排放更加环保。通过分析实现此系统所需关键部件的研发进展，对该系统面对未来的商业化可能性提供了一种启示。

关键词: 水热转化, 完全连续式, 反应器, 高压泵, 产物分离

CLC Number:

Yanmei LI, Chunyan TIAN, Xueyuan BAI, Weiming YI, Qiaoxia YUAN, Zhihe LI, Peng FU, Yuchun ZHANG, Zhiyu LI. Research and development trend on the complete continuous system for hydrothermal conversion of biomass[J]. Chemical Industry and Engineering Progress, 2021, 40(2): 736-746.

李艳美, 田纯焱, 柏雪源, 易维明, 袁巧霞, 李志合, 付鹏, 张玉春, 李治宇. 完全连续式生物质水热转化系统的研发趋势[J]. 化工进展, 2021, 40(2): 736-746.

Figures/Tables 2

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