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Stumps are a possible source of biomass for energy production, but stump extraction is still only a small scale operation and no standardized supply chain has evolved. In order to evaluate possible supply chains, we have developed a discrete-event simulation model for cost-efficient analysis of delivery costs and machine utilization in different scenarios and system configurations. In this new and...
Process simulation using ASPEN Plus is carried out to model a two-stage alkali catalyzed transesteriflcation reaction for converting micro algal oil to biodiesel. A 6:1 methanol to algal oil feed ratio is assumed using NaOH as a catalyst at 60 °C reaction temperature, which results in almost 99 % biodiesel yield for the trans-esterification reaction. Product quality is assessed and compared with market...
The paper focuses on the pyro-gasification of thin wood particles in pure CO2 at 850°C under high heating rate conditions (similar to fluidized bed gasifiers). The aim is to assess the potential use of CO2 as gasifying medium and to learn more about its effects on the pyrolysis as well as on the char gasification stages. Experiments and numerical modelling provide answers on the unfolding of the CO...
Designing an algorithm which allows automated seeking of the best operating point of a biological system is a quite complex task. That task is the subject of research for i.a. metabolic engineering which deals with control related issues, in particular with modeling of a biological phenomena kinetics as well as monitoring the unstable states of biomass growth. In the paper a theoretical analysis is...
The demand for sustainable development has led to a growing interest in biomass energy. Molten salts, such as alkali metallic salts, have been applied in biomass pyrolysis because of their good thermal stability, low vapour pressure, large heat capacity, large thermal conductivity, high solubility, low viscosity, and chemical stability. Using thermogravimetric analysis, this work studied the influence...
Straw gasifier is the new product appearing under the state that our country is advocating energy-saving and emission reduction, reasonable utilization of biological energy. This paper summarizes the development status of the gasifier at home and abroad, analyzes the existing problems of straw gasifier, points out the development trend of straw gasifier combining with concrete examples. It is of very...
The rice husk is one of the most abundant renewable biomass energy sources, which is wastage in rice milling company in China. Aiming at the present situation which the high cost of paddy drying is disadvantageous to the popularization of paddy dryer, paddy drying unit of biomass energy model CHLD using rice husk as a heat source was designed, the composition and structure characteristics of the unit...
Pyrolysis of a single biomass particle is numerically studied using a one-dimensional model which assumes virgin material decomposes through three parallel reactions to light gases, tar and char. In contrast to most past studies in which the heat of pyrolysis is assumed to be endothermic throughout the process, this paper presents a new method of calculating the pyrolysis heat in the simulation of...
Using TGA to study bagasse, peanut shell, rice husk, pine sawdust and other four kinds of agricultural and forestry wastes, and establish the apparent dynamics model of biomass Pyrolysis. Experimental research proved: the DTG curve of bagasse differs from the other three kinds of biomass. It shows two distinct peaks form. For bagasse, because of its dual weight-loss peak, its dynamics model reaction...
Pyrolysis of cotton straw (CS) was investigated using a thermogravimetirc analyzer and a lab-scale tubular reactor coupled with Fourier transform infrared (FTIR) spectrometer. The maximum pyrolysis rate increased with the rise in heating rate and the corresponding temperature also increased. The three-pseudocomponent model with first order kinetics could describe the pyrolysis behavior of cotton straw...
Co-gasification of biomass and coal is an effective way to utilize biomass energy. A wet co-gasification route-preparing slurry with semi-char and coal, was proposed in this article. The co-slurry characteristics of Shenfu coal and semi-char produced from rice stalk fast pyrolysis in a fluidized bed reactor were investigated. Meanwhile, chemical process simulation software ASPEN PLUS was used to simulate...
Hydrogen production derived from biomass gasification is proved to a competitive method to obtain environmental friendly fuel. This paper presents a model of biomass gasification in ASPEN PLUS process simulator and a detailed methodology of hydrogen production in gasifier was set up. In the period of biomass gasification, the effect on gasification efficiency of different parameters, including gasification...
By using TGA technology, the combustion characteristics under different conditions of hard coal and biomass blends has been discussed. The combustion curves of blends exhibited the characteristics with two peaks. Results also exhibited that there was partial intersection of the two components during combustion process. Heating rate had slight impact on the initial combustion temperature of blends...
In order to describe the reaction mechanism of biomass gasification better, this article modified the kinetic model previously established by the authors based on the form of reaction rate and fitted the kinetic parameters of pine sawdust, then a whole biomass gasification model were established, the equitation of mass equilibrium, reaction kinetic and energy balance are included. Finally, With MATLAB...
A non-stoichiometric equilibrium model was proposed to predict the performance of a biomass gasifier in this study. The model had produced satisfying results for product gas composition and lower heating value (LHV) prediction in air gasifier in comparison with data from literature. Effects of the operational parameters and fuel type (H/C and O/C) on the product gas were investigated.
Metamorphic grain is one kind of biomass. Thermo- gravimetric analysis is used to study the pyrolysis characteristics of two metamorphic grains, metamorphic rice and metamorphic wheat in China, at different heating rates of 5degC/ min, 10degC/ min, 20degC/ min in a stream of N2.Three methods: Coats-Redfern, Doyle and Kissinger, are used to determine the kinetic parameters, including reaction order,...
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