Research Progress of Oil Making from Sewage Sludge

2016 ◽  
Vol 851 ◽  
pp. 232-236
Author(s):  
Jiang Long Lu ◽  
Guo Ri Dong ◽  
Fang Chen ◽  
Ji Bin Wang
Keyword(s):  
High Temperature ◽  
Sewage Sludge ◽  
Low Temperature ◽  
Hot Spots ◽  
Energy Utilization ◽  
Research Progress ◽  
Treatment And Disposal ◽  
Low Temperature Pyrolysis

the treatment and disposal of sewage sludge is one of the hot spots in recent years, and the value of its energy utilization has gradually received attention by researchers. In this paper, the concept, yield, harm as well as the conventional disposal methods of sewage sludge are described, three kinds of main technologies of oil making from sewage sludge are introduced, including high temperature pyrolysis, low-temperature pyrolysis and direct thermo chemical liquefaction, and the research progress of these three technologies is reviewed.

scholarly journals High- and low-temperature pyrolysis profiles describe volatile organic compound emissions from western US wildfire fuels

2018 ◽  
Author(s):  
Kanako Sekimoto ◽  
Abigail R. Koss ◽  
Jessica B. Gilman ◽  
Vanessa Selimovic ◽  
Matthew M. Coggon ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Biomass Burning ◽  
Ponderosa Pine ◽  
Fine Particles ◽  
Voc Emissions ◽  
Western Us ◽  
Volatile Organic ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Processes

Abstract. Biomass burning is a large source of volatile organic compounds (VOCs) and many other trace species to the atmosphere, which can act as precursors to the formation of secondary pollutants such as ozone and fine particles. Measurements collected with a proton-transfer-reaction time-of-flight mass spectrometer during the FIREX 2016 laboratory intensive were analyzed with Positive Matrix Factorization (PMF), in order to understand the instantaneous variability in VOC emissions from biomass burning, and to simplify the description of these types of emissions. Despite the complexity and variability of emissions, we found that a solution including just two emission profiles, which are mass spectral representations of the relative abundances of emitted VOCs, explained on average 85 % of the VOC emissions across various fuels representative of the western US (including various coniferous and chaparral fuels). In addition, the profiles were remarkably similar across almost all of the fuel types tested. For example, the correlation coefficient r of each profile between Ponderosa pine (coniferous tree) and Manzanita (chaparral) is higher than 0.9. We identified the two VOC profiles as resulting from high-temperature and low-temperature pyrolysis processes known to form VOCs in biomass burning. High-temperature and low-temperature pyrolysis processes do not correspond exactly to the commonly used flaming and smoldering categories as described by modified combustion efficiency (MCE). The average atmospheric properties (e.g. OH reactivity, volatility, etc.) of the high- and low-temperature profiles are significantly different. We also found that the two VOC profiles can describe previously reported VOC data for laboratory and field burns. This indicates that the high- and low-temperature pyrolysis profiles could be widely useful to model VOC emissions from many types of biomass burning in the western US, with a few exceptions such as burns of duff and rotten wood.

scholarly journals Theoretical study and case analysis for a pre-dried pyrolysis coupled lignite-fired power system

2018 ◽  
Author(s):  
Ming Liu ◽  
Rongtang Liu ◽  
Junjie Yan
Keyword(s):  
Low Temperature ◽  
Case Analysis ◽  
Theoretical Models ◽  
Energy System ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Low Rank ◽  
Drying Process ◽  
Heat Value ◽  
Low Temperature Pyrolysis

Lignite, a kind of low rank coal, has the characteristics of high moisture, high volatile, high ash and low heat value. The low-temperature pyrolysis technology is potential to improve the utilization efficiency of lignite. Therefore, a lignite-based energy system integrated with pre-drying and low-temperature pyrolysis was proposed in this paper. To assess the influence of pre-drying process, theoretical models were developed based on thermodynamics, and a case analysis was then performed to get the quantitative effect of pre-drying on efficiency of energy utilization. Results show that pre-drying on PPPS theoretical model can significantly improve the utilization of lignite by 1.46%.Keywords: Lignite; Pre-drying; Low-temperature pyrolysis; Energy efficiency; Case analysis.   

Release of organic sulfur as sulfur-containing gases during low temperature pyrolysis of sewage sludge

2015 ◽  
Vol 35 (3) ◽  
pp. 2767-2775 ◽  
Author(s):  
Shuai Liu ◽  
Mengmeng Wei ◽  
Yu Qiao ◽  
Zhenle Yang ◽  
Ben Gui ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Low Temperature ◽  
Organic Sulfur ◽  
Low Temperature Pyrolysis ◽  
Sulfur Containing

Effect of alkali addition on sulfur transformation during low temperature pyrolysis of sewage sludge

2017 ◽  
Vol 36 (2) ◽  
pp. 2253-2261 ◽  
Author(s):  
Shan Cheng ◽  
Yu Qiao ◽  
Jingchun Huang ◽  
Liwen Cao ◽  
Huaizhou Yang ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Low Temperature ◽  
Sulfur Transformation ◽  
Low Temperature Pyrolysis ◽  
Alkali Addition

scholarly journals Pyrolysis of Technogenic-Redeposited Coal-Bearing Rocks of Spoil Heaps

Geosciences ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 122
Author(s):  
Nikolay I. Akulov ◽  
Varvara V. Akulova
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Kuznetsk Coal ◽  
Sulphur Compounds ◽  
Average Speed ◽  
Average Temperature ◽  
Polycyclic Aromatic ◽  
Low Temperature Pyrolysis ◽  
Bottom To Top ◽  
Spoil Heaps

The paper presents the results of a study of epigenetic changes in technogenic-redeposited coal-bearing rocks of Irkutsk and Kuznetsk coal basin spoil heaps (Russia). Hydrocarbon products formed under high-temperature and low-temperature pyrolysis of coal-bearing rocks were studied by using a chromatography-mass spectrometer GCMS-QP2010NC Plus (made by Shimadzu Company). The average temperature of low-temperature natural pyrolysis does not exceed 120 °C, and its average speed is approximately 2 m/year. In this case, three pyrolysis zones gradually built metamorphic rock mass (from bottom to top) are clearly established: heating (focal) activated and enriched. The average temperature of high-temperature pyrolysis reaches 850 °C, and its average speed is approximately 20 m/year. Unlike low-temperature pyrolysis, high-temperature pyrolysis is accompanied by the presence of two major zones (from bottom to top): pyrogenic (focal) and enriched (coke). The chemical composition of the enriched pyrolysis zone was studied in detail. It has been established that hydrocarbon compounds in samples of the pyrolysis zone are presented by six classes: asphaltic-resinous substances; polycyclic aromatic hydrocarbons, heterocyclic compounds, organic sulphur compounds; pyrolytic hydrocarbon and heavy hydrocarbon residue. Quantitative content of hydrocarbon compounds in the analyzed samples varies from 0.35% to 41.88%.

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