In this work, a model for the nitrogen chemistry in the oxy-fuel combustion of pulverized coal has been developed. The model is a chemical reaction engineering type of model with a detailed reaction mechanism for the gas-phase chemistry, together with a simplified description of the mixing of flows, heating and devolatilization of particles, and gas solid reactions. The model is validated by co...

Torrefaction is a thermo-chemical process that reduces the moisture content of wood and transforms it into a brittle, char-type material. The thermo-chemical process can reduce the mass of wood by 20-30% resulting in a denser, higher-valued product that can be transported more economically than traditional wood chips. Through torrefaction, wood may retain 90% of the energy value. This energy de...

The headspace extraction-GC-MS was used to separate and identify the volatile components of brown coal distillate(BCD)in this paper, while the retention index (RI)was verified using the C8-C40 n-alkane mix standard. There were 15 kinds of volatile components of BCD which had been identified; the main ingredients included acids, alcohols, esters, ketones, etc. And the quantity of each component ...

Abstract Peat forming environment strongly influences the economic value of any coal seam and coal-bearing strata. Hence, palaeoenvironmental studies provide important information for resource exploration. In this context, detailed on selected coals from Parvadeh Area, Iran, were conducted using sedimentology, petrology, X-ray diffraction (XRD), scanning electron microscopy- energy dispersive a...

Biomass oxy-combustion is attracting considerable attention in recent times because it can achieve negative CO2 emission. While different fundamental issues of oxy-coal combustion are being tackled and pilot demonstrations have been conducted at various scales, little is known about the behaviour of biomass under oxy-fuel combustion. This paper investigates and presents the results of the devol...

Utilization of coal as a direct fuel can cause environmental problems such solid waste in the form fly ash (flyash). This study aims to process into coke using pyrolysis method hope increasing quality and efficiency that is safe for environment. research was conducted 3 stages. The first stage carried out by crushing coal, sieving testing proximate ultimate analyzing calorific value coal. secon...

Based on coal spontaneous combustion characteristics under different influence differ greatly. The oxidation mechanism of is reviewed. surface active functional groups which the were studied. factors affecting analyzed, including volatile matter, ash, moisture content and metal elements. It provides reference guidance for further study characteristics.

subject analysis of the potential of spontaneous combustion in coal layers with analytical and numerical methods has been always considered as a difficult task because of the complexity of the coal behavior and the number of factors influencing it. empirical methods, due to accounting for certain and specific factors, have not accuracy and efficiency for all positions. the rock engineering syst...

Abstract Coal-conversion technologies, although used ubiquitously, are often discredited due to high pollutant emissions, thereby emphasizing a dire need optimize the combustion process. The co-firing of coal/biomass in fluidized bed reactor has been an efficient way pollutants emission. Herein, new model designed Aspen Plus® simultaneously include detailed reaction kinetics, volatile compositi...