scholarly journals Syngas production by chemical-looping gasification of waste activated carbon with iron-based oxygen carrier

2020 ◽  
Author(s):  
Xiao Li ◽  
Mei An ◽  
Man Wu ◽  
Jinshuai Li ◽  
Xiuli Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Solid Waste ◽  
Reaction Temperature ◽  
Flow Rate ◽  
Oxygen Carrier ◽  
Steam Flow ◽  
Chemical Looping ◽  
Cyclic Performance ◽  
Steam Flow Rate ◽  
Iron Based

Abstract Waste activated carbon (WAC), as a typical solid waste, can be utilized by chemical looping gasification (CLG) technology with an iron-based oxygen carrier to produce valuable synthesis gas products. A series of experiments on WAC of the CLG process were carried out in a fixed-bed reactor. The operation parameters involving the OC/WAC mole ratio, steam flow rate and reaction temperature during WAC CLG reactions were investigated in detail. Further, the cyclic performance within 10 cycles was also discussed. Fresh and other representative oxygen carrier samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterization methods. The results showed that the optimal OC/WAC mole ratio, steam flow rate and reaction temperature were determined to be 0.15, 0.10 mL/min, and 950 °C, respectively, to obtain high-quality syngas with relatively high carbon conversion. The iron-based oxygen carrier exhibited a stable cyclic performance during the multiple tests, following the reaction path of Fe2O3→Fe0.98O in the individual reduction process. Moreover, the iron-based oxygen carrier could be oxidized almost to its initial state after 10 redox tests, and no obvious sintering and agglomeration phenomena were observed. The WAC of CLG presents a new approach for the comprehensive utilization and disposal of solid waste, especially with low volatile feedstocks.

scholarly journals Syngas production by chemical-looping gasification of waste activated carbon with iron-based oxygen carrier

2020 ◽  
Author(s):  
Xiao Li ◽  
An Mei ◽  
Man Wu ◽  
Jinshuai Li ◽  
Xiuli Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Solid Waste ◽  
Reaction Temperature ◽  
Flow Rate ◽  
Oxygen Carrier ◽  
Steam Flow ◽  
Chemical Looping ◽  
Cyclic Performance ◽  
Steam Flow Rate ◽  
Iron Based

Abstract Waste activated carbon (WAC), as a typical solid waste, can be utilized by chemical looping gasification (CLG) technology with an iron-based oxygen carrier to produce valuable synthesis gas. A series of experiments on WAC of the CLG process have been carried out in a fixed-bed reactor. The operation parameters involving the OC/WAC mole ratio, steam flow rate and reaction temperature during CLG reactions have been investigated in detail. Further, the cyclic performance within 10 cycles has been also discussed. Fresh and cyclic reaction oxygen carrier samples have been analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In order to obtain high-quality syngas with high carbon conversion, the optimal of OC/WAC mole ratio, steam flow rate and reaction temperature are 0.15, 0.10 mL/min, and 950 °C, respectively. The iron-based oxygen carrier exhibits a stable cyclic performance during the multiple tests, following the reaction path of Fe2O3→Fe0.98O in the individual reduction process. Moreover, the iron-based oxygen carrier could be oxidized almost to its initial state after 10 redox tests. No obvious sintering and agglomeration phenomena are observed. The WAC of CLG presents a new approach for the comprehensive utilization and disposal of solid waste, especially with low volatile feedstock.

Preparation of Eupatorium Adenophorum Based Porous Carbon with Microwave Heating using Response Surface Methodology

2014 ◽  
Vol 33 (5) ◽  
pp. 427-437
Author(s):  
Zhao-qiang Zheng ◽  
Hong-ying Xia ◽  
C. Srinivasakannan ◽  
Jin-hui Peng ◽  
Li-bo Zhang
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Process Parameters ◽  
Flow Rate ◽  
Porous Carbon ◽  
Steam Flow ◽  
Process Conditions ◽  
Eupatorium Adenophorum ◽  
Activation Temperature ◽  
Steam Flow Rate

AbstractEupatorium adenophorum was utilized as raw materials for the preparation of activated carbon via microwave assisted steam activation. Influences of the three vital process parameters – activation temperature, activation duration and steam flow rate – have been assessed on the adsorption capacity and yield of Eupatorium adenophorum activated carbon (EAAC). The process parameters were optimized utilizing the Design Expert software and were identified to be an activation duration of 45 min, an activation temperature of 950 °C and a steam flow rate of 0.7 ml/min, with the resultant iodine number and yield being 1,010 mg/g and 20.13% respectively. The validity of process model to optimize the process parameters was verified using the analysis of variance (ANOVA). The key parameters that characterize quality of the porous carbon such as the BET surface area, total pore volume and average pore diameter were estimated to be 1,142 m2/g, 0.84 ml/g and 3.3 nm respectively, for the sample corresponding to the optimized process conditions. Additionally the pore structure is characterized using Scanning Electron Microscope (SEM). The present work strongly supports utilization of Eupatorium adenophorum as a potential precursor through microwave heating.

Study on the Kinetics of Chemical Looping Combustion of Copper-Based Oxygen Carrier

2013 ◽  
Vol 724-725 ◽  
pp. 1140-1144
Author(s):  
Yong Qiang Liu ◽  
Zhi Qi Wang ◽  
Jing Li Wu ◽  
Jin Hu Wu
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Flow Rate ◽  
Conversion Rate ◽  
Gas Flow ◽  
Oxygen Carrier ◽  
Combustion Process ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Gas Flow Rate

Kinetics is the study of rates of chemical processes, which includes investigations of how different experimental conditions can influence the speed of a chemical reaction and the reactions mechanism. In this paper, the influences of several parameters including particle size and mass of copper-based oxygen carrier, reaction gas flow rate and temperature on the conversion rate of oxygen carrier in chemical looping combustion was investigated. The results of experiment reveal that the conversion rate of oxygen carrier is influenced by the reaction temperature, mass of the oxygen carrier and the reaction gas flow rate. The conversion rate of oxygen carrier is improved with decreasing the mass of the oxygen carrier and increasing the reaction gas flow rate within a certain extent in the chemical looping combustion process. The particle size has very little effect on the conversion rate, and 800 °C is an advisable reaction temperature for chemical looping combustion process of copper-based oxygen carrier with methane and air.

scholarly journals CO2-gasification of a lignite coal in the presence of an iron-based oxygen carrier for chemical-looping combustion

Fuel ◽  
2014 ◽  
Vol 127 ◽  
pp. 186-201 ◽  
Author(s):  
Marco A. Saucedo ◽  
Jin Yang. Lim ◽  
John S. Dennis ◽  
Stuart A. Scott
Keyword(s):  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Co2 Gasification ◽  
Lignite Coal ◽  
Iron Based

Syngas production by chemical looping co-gasification of rice husk and coal using an iron-based oxygen carrier

Fuel ◽  
2022 ◽  
Vol 309 ◽  
pp. 122100
Author(s):  
Ming Luo ◽  
Haiyan Zhang ◽  
Shuxiang Wang ◽  
Jianjun Cai ◽  
Yanjun Qin ◽  
...  
Keyword(s):  
Rice Husk ◽  
Oxygen Carrier ◽  
Chemical Looping ◽  
Syngas Production ◽  
Iron Based

A Novel Hybrid Method Based on Three-Stage Extraction and DEA-CCR Models for Selecting the Optimal Conditions for Citronella Oil Extraction

2021 ◽  
Author(s):  
Thaithat Sudsuansee ◽  
Narong Wichapa ◽  
Amin Lawong ◽  
Nuanchai Khotsaeng
Keyword(s):  
Energy Consumption ◽  
Flow Rate ◽  
Energy Cost ◽  
Oil Extraction ◽  
Steam Flow ◽  
Oil Yield ◽  
Steam Flow Rate ◽  
Citronella Oil ◽  
Extraction Model ◽  
Ccr Model

In citronella oil extraction process by steam distillation, inefficient use of steam is the main cause of excessive energy consumption that affects energy cost and oil yield. This research is aimed to reduce the energy cost and increase the oil yield by studying the steam used in the process. The proposed method is the three-stage extraction model combined with the Data Envelopment Analysis developed by Charnes, Cooper and Rhodes (DEA-CCR model). Although the three-stage extraction model has been widely used, there is no research integrate this model with DEA-CCR model. It is well known that DEA-CCR model is an effective tool to evaluate efficiency of decision making units/alternatives. The advantages of this research were presented as the calculation of the optimum distillation conditions, including the steam flow rate and the distillation time, were achieved as discussed in this article. The study was comprised of 3 parts. Firstly, the three-stage extraction model for citronella oil was formulated. Secondly, the results of the proposed model were calculated under different conditions, classified by steam flow rates from 5,000 to 60,000 cm3/min for the distillation period of 15–180 min. Finally, the DEA-CCR model was utilized to evaluate and rank alternatives. The results expressed that the best condition for producing citronella oil was at the steam flow rate of 40,000 cm3/min and the distillation time of 60 min. The optimal energy cost and percentage of oil yield were equal to 0.440 kWh/mL and 0.7%, respectively. When comparing to the experimental results, the percentage error of optimal energy cost and oil yield were slightly different, with a value of 0.98% and 0.85%, respectively. Moreover, the energy consumption was also reduced by 34.6% compared to the traditional operating conditions.

scholarly journals The direct solid-solid reaction between coal char and iron-based oxygen carrier and its contribution to solid-fueled chemical looping combustion

2016 ◽  
Vol 184 ◽  
pp. 9-18 ◽  
Author(s):  
Liangyong Chen ◽  
Jinhua Bao ◽  
Liang Kong ◽  
Megan Combs ◽  
Heather S. Nikolic ◽  
...  
Keyword(s):  
Oxygen Carrier ◽  
Coal Char ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Solid Reaction ◽  
Iron Based ◽  
Direct Solid

Effect of Adding Pump-Around Circuits and Reducing Stripping Steam Flow Rate on the Improving Energy Efficiency and Increasing Processing Capacity of the Atmospheric Column

2012 ◽  
Vol 550-553 ◽  
pp. 939-942
Author(s):  
Zhen Wang ◽  
Wei Wei Li ◽  
Hui Peng Zhao
Keyword(s):  
Energy Efficiency ◽  
Flow Rate ◽  
Steam Flow ◽  
Processing Capacity ◽  
Atmospheric Column ◽  
Steam Flow Rate ◽  
Refinery Plant ◽  
Stripping Steam

This paper discusses the effect of adding pump-around circuits and reducing stripping steam flow rate on the improving energy efficiency and increasing processing capacity of the atmospheric column in a refinery plant by using commercial simulator. It is shown that both the capacity and energy efficiency of the atmospheric column can be increased by adding pump-around circuits and reducing stripping steam flow rate. The modifications discussed in this paper will affect the separation of the atmospheric column in some way. However, the product qualities can still meet the specifications, if the changes of the parameters are not significant. Therefore, the above issues should be considered in the modifications overall.

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