The hydrothermal liquefaction as a promising procedure for microalgae-to-biofuel conversion: A general review and some thermophysical problems to be solved

IF 1.1 4区工程技术 Q4 Engineering

High Temperatures-high Pressures Pub Date : 2020-01-01 DOI:10.32908/hthp.v48.716

M. Vlaskin, A. Grigorenko, N. Chernova, S. Kiseleva, I. A. Lipatova, O. Popel, L. Dombrovsky

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引用次数: 2

Abstract

At present, microalgae are industrially produced mainly for the extraction of high-value products for food additives. At the same time, the microalgae possess also environmental advantages as it can be used for wastewater treatment, mitigation of industrial CO2 emissions as well as for oxygen production and atmospheric CO2 capturing. Due to increasing the environmental problems, it is reasonable to expand the “green” applications of microalgae and increase significantly their output. From this point of view, the problem of utilization of the microalgal biomass becomes more important and one of the most reliable ways to do it is a conversion of the biomass to a biofuel. It is expected that such a conversion can be implemented into the existing infrastructure for traditional hydrocarbons. In the case of microalgae, the hydrothermal liquefaction (HTL) with the production of bio-oil as a target product has attracted more attention in recent years because the bio-oil can be used in the existing refinery industry. The paper is also concerned with the use of microalgae to solve the environmental issues on the basis of HTL as a convenient and efficient method for the biomass-to-biofuel conversion. The known advantages of the HTL are the possible use of fresh microalgae just after harvesting, the processing of the whole biomass and high thermodynamic efficiency. In the paper it is shown that the latter is achieved due to the high HTL pressure that keeps the high-temperature potential of aqueous media after hydrothermal treatment and so creates the opportunity of more efficient heat recovery. The fundamental aspects of the process thermodynamics are discovered in the paper. It is shown that one of the main advantages of the process is provided by a combination of thermodynamic parameters. The problem of solar radiative transfer in photobioreactors with suspended microalgae and the desired thermophysical properties of the refined biofuels are also briefly discussed in the paper.

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水热液化是一种很有前途的微藻转化为生物燃料的方法:综述和一些有待解决的热物理问题

目前，微藻的工业生产主要用于食品添加剂高价值产品的提取。同时，微藻还具有环境优势，因为它可以用于废水处理，减少工业二氧化碳排放，以及氧气生产和大气二氧化碳捕获。由于环境问题日益严重，扩大微藻的“绿色”应用，显著提高微藻产量是合理的。从这个角度来看，利用微藻生物量的问题变得更加重要，而将其转化为生物燃料是最可靠的方法之一。预计这种转换可以在现有的传统碳氢化合物基础设施中实施。以微藻为例，以生产生物油为目标产品的水热液化(HTL)由于其生物油可用于现有的炼油工业，近年来备受关注。本文还探讨了利用微藻在HTL基础上解决环境问题，将其作为一种便捷、高效的生物质转化为生物燃料的方法。HTL的已知优点是可以在收获后使用新鲜的微藻，整个生物质的处理和高热力学效率。本文表明，后者的实现是由于高HTL压力，水热处理后水介质保持高温势，从而创造了更有效的热回收的机会。本文发现了过程热力学的基本方面。结果表明，该工艺的主要优点之一是由热力学参数的组合提供。本文还简要讨论了悬浮微藻光生物反应器中的太阳辐射传输问题以及所要求的精制生物燃料的热物理性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Temperatures-high Pressures THERMODYNAMICS-MECHANICS

CiteScore

1.00

自引率

9.10%

发文量

期刊介绍： High Temperatures – High Pressures (HTHP) is an international journal publishing original peer-reviewed papers devoted to experimental and theoretical studies on thermophysical properties of matter, as well as experimental and modelling solutions for applications where control of thermophysical properties is critical, e.g. additive manufacturing. These studies deal with thermodynamic, thermal, and mechanical behaviour of materials, including transport and radiative properties. The journal provides a platform for disseminating knowledge of thermophysical properties, their measurement, their applications, equipment and techniques. HTHP covers the thermophysical properties of gases, liquids, and solids at all temperatures and under all physical conditions, with special emphasis on matter and applications under extreme conditions, e.g. high temperatures and high pressures. Additionally, HTHP publishes authoritative reviews of advances in thermophysics research, critical compilations of existing data, new technology, and industrial applications, plus book reviews.