Prospects for high-temperature gasification of coal and sludge

Bogomolov, A. R.; Alekseev, M. V.

doi:10.1134/s0040601512080022

Cited by 11 publications

(3 citation statements)

References 2 publications

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“…To synthesize methanol or aliphatic hydrocarbons, a gas with СО:Н2 = 1:2 ratio is used. To obtain aldehydes with the help of octosynthesis reaction, a syngas, being of СО:Н2 = 1:1 composition and reacting with olefins, is used; the methane synthesis requires that the СО:Н2 ratio would be 3:1 [39][40][41].…”

Section: Analysis Of Recent Sstudies and Publicationsmentioning

confidence: 99%

Chemistry of the Gasification of Carbonaceous Raw Material

Saik

Dychkovskyi

Lozynskyi

et al. 2021

MSF

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The paper represents the studies of the process of carbonaceous raw material gasification. The initial material is represented by bituminous coal of grade H with the carbon (C) content of 79.2-85.3 %. Experimental studies have been used to substantiate the parameters of combustible generator gases (СО, Н2, СН4) output depending on the temperature of a reduction zone of the reaction channel and gas flow velocity along its length. It has been identified that the volume of the raw material input to be used for gasification process changes in direct proportion depending on the amount of burnt-out carbon and blow velocity. The gasification is intensified in terms of equal concentration of oxygen and carbon in the reaction channel of an underground gas generator. The gasification rate is stipulated by the intensity of chemical reactions, which depend immediately on the modes of blow mixture supply. Moreover, they depend directly on the intensity of oxygen supply to the coal mass and removal of the gasification products.

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Section: Analysis Of Recent Sstudies and Publicationsmentioning

confidence: 99%

Chemistry of the Gasification of Carbonaceous Raw Material

Saik

Dychkovskyi

Lozynskyi

et al. 2021

MSF

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“…Synthesis gas obtained in the process of steam oxygen-free gasification [1] is characterized by the content (% by vol.) of the target H 2 components equal to 62, while CO -to 26.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature purification of the synthesis gas

Korobeinikov

2017

MATEC Web Conf.

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In this paper, studies are made of the most economical method of low-temperature purification of synthesis gas, which is obtained during steam gasification of carbonizate. The analytical calculation is based on the cooling and phase transition of sulfur and carbon dioxide compounds and their separation. The paper presents the comparison of process energy costs depending on consumption characteristics and process parameters.

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“…Dried samples were then comminuted by cutting mill to pass through a screen of 1.00mm in diameter into powder form. Impacts of particle size on thermochemical conversion processes and extraction and isolation analysis for biochemical components found to be diminished as size reduced and it could be considered as insignificant when less than 1.20mm (Bogomolov et al, 2013;Nilsson et al, 2012;Sluiter et al, 2010…”

Section: Sample Pre-treatmentmentioning

confidence: 99%

A comprehensive analytical study of sludge from water reclamation plants in Singapore for advanced thermochemical conversion processes

Chan¹

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Rising demand on wastewater treatment caused by population growth, urbanisation and industrialisation was producing increasing amount of sludge residues as byproduct. Innovative management strategy and technology for energy and resource recovery were therefore required to properly handle sludge which consisted significant amount of moisture, ash, nitrogen, sulphur, and heavy metals. Mechanical dewatering, thermal drying, agricultural utilisation, landfilling, and incineration were commonly applied for sludge treatment and final disposal but facing issues on low dewatering effectiveness, high energy consumptions, restrictions on agricultural reuse, limitation on landfill availability, low energy recovery efficiency and generation of flue gas with considerable amount of pollutants. Recently, sludge attracted great interests as a potential feedstock for advanced thermochemical conversion processes such as pyrolysis and gasification which were capable to convert cheap heterogeneous waste mixtures into valuable homogenous products such as synthetic gas, pyrolysis oil and char. However, composition and thermal degradation behaviours of sludge were found to be highly complex and distinctive as compared to other traditional feedstock and therefore created significant challenges in engineering design and system optimisation. To address the need of fundamental research on sludge, a comprehensive analytical study specifically for advanced thermochemical conversion processes was performed. 14 different sludge samples were collected based on type, plant, and batch categorisation from all operating Water Reclamation Plants (WRPs) in Singapore. Existing and proposed characterisation methods were applied and examined by using samples collected. Although no general consensus was achieved on the most efficient conversion method, thermally induced degradations occurred in all thermochemical processes and were considered as primary reactions important to reactor design and process modelling. Therefore comparison study on sludge thermal degradation behaviours and products evolution by using complementary analytical and experimental pyrolysis was carried out. Synthetic sludge study was also performed based on biomass composition analytical procedure and model compounds selection method developed in this study to address issues of viii uncertainty in kinetics modelling caused by heterogeneity of sludge and limited understanding on impacts of sludge composition to thermochemical processes. Qualitative similarities and quantitative variations on thermochemical characteristics and composition of different sludge samples were identified which suggested the presence of waste mixtures with comparable main components but in varying proportions. Oxidation of inorganics (apparent oxidation degree, O D = 47.07 ±19.59%) during ash formation caused deviations on characterisation results of sludge which could be reduced by alternative parameters and comparison bases proposed. Thermal degradation behaviours and products distribution found to be vari...

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Prospects for high-temperature gasification of coal and sludge

Cited by 11 publications

References 2 publications

Chemistry of the Gasification of Carbonaceous Raw Material

Chemistry of the Gasification of Carbonaceous Raw Material

Low-temperature purification of the synthesis gas

A comprehensive analytical study of sludge from water reclamation plants in Singapore for advanced thermochemical conversion processes

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