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This paper reports on the recent experimental and numerical results from a 35MW front wall-fired large pilot boiler. The boiler features a first-of-its-kind compatible design of oxy-fuel combustion and conventional air combustion (air-combustion). A sub-bituminous coal is used as fuel in the experiment. Wet and dry flue gas recycle oxy-fuel conditions are investigated, while air-combustion is also...
The pelletization of MgO-based sorbents is necessary before implementing intermediate temperature CO2 capture for industrial applications. In the current work, MgO-based sorbent pellets were prepared using an extrusion–spheronization method, with the aim of achieving an effective granulation method for MgO sorbents. Another objective of this investigation is attempting to find out the differences...
Oxidation Stability is one of the most important fuel quality criterions for biodiesel and primarily affects the stability of biodiesel. Therefore, in the present work, antioxidant activity of ginger extract was studied as a method to increase oxidation stability of Pongamia pinnata biodiesel. Ginger extract is a nature based renewable substance and has antioxidant property. The presence of phenolic...
Water vapor dilution has great impact on fundamental combustion processes such as ignition, flame propagation and extinction. In the literature, there are many studies on how water vapor addition affects flame propagation and extinction limit. However, the influence of water vapor addition on ignition receives little attention. In this study, numerical simulations considering detailed chemical mechanisms...
Recently, Deep Eutectic Solvents (DESs) have been introduced and investigated as new EOR agents for heavy oil recovery enhancement. In this study, sequential DES and steam flooding was proposed and experimentally investigated as a new scenario for heavy oil recovery enhancement and having potentials for in-situ heavy oil upgrading. DESs used in this study are Choline Chloride:Glycerol (DES1) and Choline...
An experimental study on an updraft gasifier (60kWth), using large size biomass as fuel, has been carried out to obtain the temperature profile, equivalence ratio, gas composition and its heating value. A theoretical mass and energy balance has allowed a proper justification of the experimental results obtained. The gasifier behavior was studied in-depth using large size woody biomass to avoid the...
Alkali chlorides and sulfates are well-known species induced fouling, slagging and corrosion on the heat transfer surface in biomass combustion/gasification process. This paper aims to study the condensation behavior of alkali compound vapors (ACVs) during wheat straw combustion in laboratory, without the participation of ash particles. The effects of surface temperature of Fe-Cr-Ni alloy probe on...
Laminar burning velocities of n-decane and binary kerosene surrogate mixture consisting of n-decane (80%) and benzene (20%) by liquid volume were determined at atmospheric pressure and initial gas temperatures of 338 and 358K. The heat flux method was employed to measure the burning velocity in non-stretched flames and three kinetic mechanisms were used to simulate the results: JetSurF 2.0, and two...
A new framework for volatile breakdown is developed for entrained flow gasification modeling. The framework is based on an optimized solution of an under-determined system of equations formulated using a two-step Moore-Penrose generalized matrix approach. The approach permits the determination of the volatile composition using just the Proximate-Ultimate analysis data of coal. The method can be utilized...
Declining quality and availability of petroleum cokes, which have traditionally been used for the production of carbon anodes, is forcing aluminum producers to use cokes previously regarded as unsuitable. Domestic reserves of coal represent a potential alternative carbon resource for anode production, provided coke specifications can be economically achieved. Previous studies have shown that the solvent...
To elucidate the mechanism of nitrogen transformation during biomass combustion, the formation behavior of NOx precursors during biomass devolatilization was investigated using two types of pyrolysis reactors at different heating rates (13°C/s and 104°C/s) with model compounds (i.e., mixtures of various amino acids and cellulose/lignin). It was found that 60–80% nitrogen existed as protein-N. Cellulose...
The combustion kinetics of three bio jet fuel compounds farnesane, p-menthane and p-cymene, derived from natural terpenoids, have been investigated experimentally by an atmospheric high temperature flow reactor coupled with molecular beam mass spectrometric detection (MBMS). Quantitative speciation data for their oxidation chemistry in combustion is presented to provide an insight into the combustion...
High moisture content greatly restricts the large-scale utilization of low-rank coals (LRCs). Hydrothermal dewatering (HTD) is a promising technique for dewatering and upgrading LRCs. Chinese lignite from XiMeng Mine in Inner Mongolia was upgraded by HTD. The effects of pore structure and oxygen functional group content on moisture distribution were investigated. Thermogravimetric analysis, mercury...
In this research work, liquid bio-fuels and activated carbons were produced from one non-edible feedstock, fish waste. First, the fish oil was extracted from fish waste and transesterified with methanol and ethanol to produce methylic and ethylic biodiesels, respectively using potassium hydroxide as base catalyst. The fuel properties of the obtained biodiesels met the specifications stipulated by...
In this scientific contribution we verified the qualitative and quantitative validity of the DIN EN 12916 or ASTM D6591 based on high performance liquid chromatography with a refractive index detector (HPLC – RID) for the correct determination of aromatic compounds in middle distillates. This was achieved by investigating the influence of the potential insufficient LC separation of aromatic and aliphatic...
The purpose of this study was to utilize gasification derived char as a catalyst support for tar removal. Red cedar char collected from downdraft bed gasification was chemically activated into activated carbon and impregnated with nickel acetate and nickel nitrate. The effects of nickel salts precursor, nitric acid treatment of support and reduction of nickel in hydrazine medium on catalyst performance...
Elemental mercury (Hg0) removal via adsorption using a derived bio-char from waste tea and then modified by NH4Cl has been studied. The effect of the following parameters on elemental mercury removal efficiency was investigated: loading of NH4Cl, ultrasound treatment method, space velocity, reaction temperature and flue gas composition. The optimum loading of NH4Cl was found to be 5wt.%. The Hg0 removal...
Three dimensional DNS are performed to investigate the auto-ignition behavior of n-heptane droplets in high-temperature products of premixed H2/air combustion. A skeletal chemistry which contains 44 species 122 element reactions is adopted. Two-way coupling is considered for the interaction between liquid phase and gas phase by Eulerian-Lagrangian point-source approach. The initial turbulence is homogenous...
Partial least squares regression (PLS) in conjunction with distillation curves (ASTM D86) were used successfully to predict the vapor pressure of automotive gasoline. The errors obtained in the calibration and validation models (0.71 and 0.69kPa) were lower than those reported in the literature. In addition, the proposed method is inexpensive, reduces test time and is easy to implement, making it...
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