Experimental study on co-combustion of low rank coal semicoke and oil sludge by TG-FTIR

Zhao, Ruyan; Qin, Jianguang; Chen, Tianju; Wang, Leilei; Wu, Jinhu

doi:10.1016/j.wasman.2020.08.007

Cited by 64 publications

(16 citation statements)

References 50 publications

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“…Non-condensable gas-phase products contain a large number of combustible compounds such as CH 4 (17.3 vol%), C 2 H 6 (8.9 vol%), and CO (33.5 vol%) (Figure 6). In this case, H 2 (15.9 vol%) is most likely formed due to the interaction of carbon and vapor (1), and H 2 S (3.3 vol%) is formed due to hydrogen and sulfur (2) contained in OS [32].…”

Section: Materials Balance Of the Obtained Products Of Steam Pyrolysismentioning

confidence: 99%

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

et al. 2022

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Experimental studies of the steam pyrolysis of oil sludge were performed using a flow-type pilot plant with 300 kg/h capacity (raw material) to obtain energy-valuable products, such as liquid hydrocarbons (30.4 wt%), semi-coke (39.6 wt%), non-condensable gas-phase compounds (26.5 wt%), and bitumen (3.5 wt%). The pyrolysis process was conducted at a temperature of 650 ° C and with a steam flow rate of 150 kg/h. Liquid hydrocarbons were considered a target product. Comprehensive studies of their physicochemical characteristics, atomization process, droplet ignition, and combustion were carried out. The studied sample had physicochemical characteristics similar to traditional fuel oil (calorific value—42.6 MJ/kg, sulfur content—0.8 wt%). The jet spraying angle was 25° in view of the improved rheological properties of the test sample, with a homogeneous jet structure and a predominant droplet diameter of no more than 0.4 mm. The flame combustion process was accompanied by the formation of microexplosions, the frequency and intensity of which depended on the temperature of the air (Tg = 450–700 °C). This study, in view of its applied nature, is of interest in the design of new installations and technological systems for hydrocarbon pyrolysis.

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Section: Materials Balance Of the Obtained Products Of Steam Pyrolysismentioning

confidence: 99%

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

et al. 2022

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“…It can be observed from Figure 4 that the emission peaks of NH 3 , HCN, NO, and NO 2 are concentrated in the range of 500-600 • C during the combustion of individual RC, which almost coincides with the peak position of DTG curves of RC. On the contrary, there are complex N-containing substances, such as proteins, amino acids, and heterocyclic nitrogen in SS, which means that the main occurrence mode of N is volatile-N, and they tend to be released at relatively low temperatures [9]. The NO emission curve of SS displays multiple release peaks, of which the first emission peak is attributed to the decomposition of volatiles, and the second peak is due to the char combustion with N-containing substances [11].…”

Section: Gaseous Pollutant Emissionsmentioning

confidence: 99%

“…The co-combustion of sludge and other solid fuels is a feasible solution that can effectively improve the combustion performance [8]. To date, there have been many research reports regarding the co-combustion of sludge and other solid fuels by thermogravimetric analysis (TG) [9][10][11][12][13]. Zhao et al [9] investigated the co-combustion characteristics of low-rank coal semicoke and oil sludge by the TG-FTIR method.…”

Section: Introductionmentioning

confidence: 99%

“…To date, there have been many research reports regarding the co-combustion of sludge and other solid fuels by thermogravimetric analysis (TG) [9][10][11][12][13]. Zhao et al [9] investigated the co-combustion characteristics of low-rank coal semicoke and oil sludge by the TG-FTIR method. They found that the blending of oil sludge on low-rank coal semicoke could effectively improve the ignition, burnout, and comprehensive combustion performance of blends.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Thermal Behavior, Synergistic Catalysis, and Pollutant Emissions during the Co-Combustion of Sewage Sludge and Coal Gasification Fine Slag Residual Carbon

Jia

Guo

et al. 2021

Catalysts

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The conversion of solid waste into energy through combustion is sustainable and economical. This study aims to comprehensively evaluate and quantify the co-combustion characteristics, synergistic catalysis, and gaseous pollutant emission patterns of sewage sludge (SS) and coal gasification fine slag residual carbon (RC) as well as their blends through thermogravimetry coupled with mass spectrometry (TG-MS). The results showed that the co-combustion of SS and RC can not only improve the ignition and burnout property but also maintain the combustion stability and comprehensive combustion performance at a better level. The kinetic analysis results showed that a first-order chemical reaction and three-dimensional diffusion are the reaction mechanisms during the co-combustion of SS and RC. The synergistic catalysis between SS and RC can well explain the changes in activation energy and reaction mechanism. Furthermore, the blending ratio of SS is recommended to be maintained at 40% because of the lowest activation energy (Ea= 81.6 kJ/mol) and the strongest synergistic effect (Xi = 0.36). The emission of gaseous pollutants is corresponding to the primary combustion stages of SS, RC, and their blends. In co-combustion, the NH3, HCN, NOx, and SO2 emissions gradually rise with the increase of SS proportion in the blends due to the high content of organic compounds in SS.

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“…With the rapid development of the petrochemical industry, the production scale of oil field exploitation and oil refining enterprises are constantly expanding, resulting in a constantly increasing of the waste generated in the process of crude oil exploitation and oil refining 1 . Oil sludge (OS), as a representative solid waste produced in the production process of oil fields, is mainly composed of petroleum hydrocarbons, mud and sand, and pharmaceutical agents and water.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on kinetic characteristics of oil sludge gasification

Chu

Gong²,

Wang

et al. 2021

Asia-Pacific J Chem Eng

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Oil sludge (OS) is a typical dangerous waste in petroleum industry, which also contains abundant energy. The purpose of this study was to recover resources from OS gasification. To figure out the gasification process, a thermal analyzer was used to carry out OS gasification experiments under steam/nitrogen atmosphere with different heating rates. Results showed that the OS gasification reaction could be divided into five stages: free water volatilization, the escape of light components, the cracking of heavy components and steam reforming, the charring process and water gas shift (WGS) reactions, and inorganic mineral decomposition. The activation energy (E), pre‐exponential factor (A), enthalpy change (ΔH), Gibbs free energy change (ΔG), and entropy change (ΔS) of three main reaction stages (Stages 2–4) were analyzed through kinetic and thermodynamic analysis. From Stage 2 to Stage 4, E, ΔH, and ΔS decreased from 118.80 kJ·mol−1, 113.92 kJ·mol−1, and −4.09 J·(K mol)−1 to 13.19 kJ·mol−1, 5.92 kJ·mol−1, and −234.06 J·(K mol)−1, respectively. Nevertheless, ΔG increased from 116.01 to 210.04 kJ·mol−1. From these parameters, it could be found that the decrease of E was beneficial to the reaction. However, the values of ΔG were always positive and the reaction could not happen spontaneously.

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Experimental study on co-combustion of low rank coal semicoke and oil sludge by TG-FTIR

Cited by 64 publications

References 50 publications

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

Evaluation of the Thermal Behavior, Synergistic Catalysis, and Pollutant Emissions during the Co-Combustion of Sewage Sludge and Coal Gasification Fine Slag Residual Carbon

Experimental study on kinetic characteristics of oil sludge gasification

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