Air-Steam gasification of lignite in a fixed bed gasifier: Influence of steam to lignite ratio on performance of downdraft gasifier

Upadhyay, Darshit S.; Panchal, Krunal R.; Sakhiya, Anil Kumar; Patel, Rajesh N.

doi:10.1016/j.energy.2020.118187

Cited by 25 publications

(9 citation statements)

References 38 publications

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“…This demonstrates that the addition of steam favors the gas reaction and transformation reaction. 40 As S/B increased from 0.3 to 1.5, the LHV of producer gas declined from 9.57 to 8.21 MJ Nm −3 (Fig. 7(c)).…”

Section: Resultsmentioning

confidence: 92%

Effects of the secondary air inlet position and gasifying agents on grape branch gasification in an improved downdraft gasifier

Huai,

Zhang,

Yang

et al. 2022

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 92%

Effects of the secondary air inlet position and gasifying agents on grape branch gasification in an improved downdraft gasifier

Huai,

Zhang,

Yang

et al. 2022

Sustainable Energy Fuels

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“…Model validation was performed to test the accuracy of the simulated model. The experimental results reported in studies published by Jayah et al and Upadhyay et al were used to validate the present model. The model was also validated using published simulation results reported by Kombe et al The feedstock characterizations used in studies selected for result comparison are given in Table .…”

Section: Methodsmentioning

confidence: 90%

“…The absence of CH 4 as the main constituent of product gases confirms the reliability of the present simulation model. 48 In the second experimental work, 52 the air−steam gasification of Indian low-rank highash type lignite coal was performed in a fixed-bed gasifier in the range of the steam to lignite ratio of 0 to 0.48. The dry-basis compositions of gases are compared and are shown in Figure 2e.…”

Section: Model Validationmentioning

confidence: 99%

High-Ash Low-Rank Coal Gasification: Process Modeling and Multiobjective Optimization

2022

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The diversification of coal for its sustainable utilization in producing liquid transportation fuel is inevitable in countries with huge coal reserves. Gasification has been contemplated as one of the most promising thermochemical routes to convert coal into high-quality syngas, which can be utilized to produce liquid hydrocarbons through catalytic Fischer−Tropsch (F-T) synthesis. Liquid transportation fuel production through coal gasification could help deal with environmental challenges and renewable energy development. The present study aims to develop an equilibrium model of a downdraft fixed-bed gasifier using Aspen Plus simulator to predict the syngas compositions obtained from the gasification of high-ash low-rank coal at different operating conditions. Air is used as a gasifying agent in the present study. The model validation is done using published experimental and simulation results from previous investigations. The sensitivity analysis is done to observe the influence of the major operating parameters, such as equivalence ratio (ER), gasification temperature, and moisture content (MC), on the performance of the CL-RMC concerning syngas generation. The gasification performance of CL-RMC is analyzed by defining various performance parameters such as syngas composition, hydrogento-carbon monoxide (H 2 /CO), molar ratio, syngas yield (Y Syngas ), the lower heating value of syngas (LHV Syngas ), cold gas efficiency (CGE), and carbon conversion efficiency (CCE). The combined effects of the major operating parameters are studied through the response surface methodology (RSM) using the design of experiments. The optimized condition of the major operational parameters is determined for a target value of a H 2 /CO molar ratio of 1 and the maximum CGE and CCE using the multiobjective optimization approach. The high-degree accurate regression model equations were generated for the H 2 /CO molar ratio, CGE, and CCE using the variance analysis (ANOVA) tool. The optimal conditions of the major operating parameters, i.e., ER, gasification temperature, MC for the H 2 /CO molar ratio of 1, and the maximum CGE and CCE, are found to be 0.5, 655 °C, and 16.36 wt %, respectively. The corresponding optimal values of CGE and CCE are obtained as 22 and 16.36%, respectively, with a cumulative composite desirability value of 0.7348. The findings of the present investigation can be decisive for future developmental projects in countries concerning the utilization of high-ash low-rank coal in liquid fuel production through the gasification route.

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“…The electric power produced by the Bio plant

. 50 , 51 , 52

where,

is the efficiency of the bio plant and is given by the manufacturer.

is the fuel consumption rate, in kg/s

is the calorific value of biofuel in MJ/kg.…”

Section: Methodsmentioning

confidence: 99%

Optimization of solar and battery-based hybrid renewable energy system augmented with bioenergy and hydro energy-based dispatchable source

2023

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Air-Steam gasification of lignite in a fixed bed gasifier: Influence of steam to lignite ratio on performance of downdraft gasifier

Cited by 25 publications

References 38 publications

Effects of the secondary air inlet position and gasifying agents on grape branch gasification in an improved downdraft gasifier

Effects of the secondary air inlet position and gasifying agents on grape branch gasification in an improved downdraft gasifier

High-Ash Low-Rank Coal Gasification: Process Modeling and Multiobjective Optimization

Optimization of solar and battery-based hybrid renewable energy system augmented with bioenergy and hydro energy-based dispatchable source

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