Process simulation of a lignite-fired circulating fluidized bed boiler integrated with a dryer and a pyrolyzer

Cai, Lijun; Zhang, Y.; Gao, Shiqiu; Xiao, Xin; Zhang, J.; Xu, Guangwen; Cui, Li

doi:10.1080/15567036.2011.631972

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…Cai et al established a process flowsheet to investigate the performance of a lignite coal-fired circulating fluidized bed boiler integrated with a dryer and pyrolysis reactor. They used lab-scale experimental data to validate their model . In addition, there is a noticeable lack of energy and carbon footprint evaluations as well as techno-economic analysis studies that can determine the most efficient process for a low-rank coal drying process combined with pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

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Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

2018

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In this paper, utilization of Victorian brown coal in a drying–pyrolysis process to make products is techno-economically assessed. The pyrolysis process is coupled with the drying and briquette making processes in order to improve the overall efficiency and quality of the products. The pyrolysis process led to the production of char, liquid oil, and hydrogen-rich noncondensable gases. A steady-state Aspen Plus simulation model was developed that provides estimated mass and energy balances for the overall system. The effect of a change in the heating mode and heating medium of the dryer on the overall energy and overall product yields was examined. Additionally, the effect of a change in the pyrolysis gas composition and coal initial moisture was studied. Results revealed that the rotary drum dryer with hot flue gas as a heating medium showed the best performance in terms of the final yields of the pyrolysis products and CO2 emission rate. In the best case scenario, when hot flue gas is used directly in a rotary drum dryer, approximately 55% of the total gas produced from the pyrolysis process is needed to burn in a separate boiler to provide heat for the whole system. The shorter residence time in the pyrolysis reactor results in a lower calorific value gas with less hydrogen but more CO2 produced, which in turn increases the consumption of gas to be burnt to provide heat for the whole system. The wet coal initial moisture is another important factor affecting the energy required for the dryer and hence the total energy consumption. A coal with a higher moisture content needs more coal gas to be burnt and releases more CO2. The cash flow analysis indicated the net present value (NPV) of $52.8 million for a plant with a capacity of 70.6 t/h raw coal based on the first quarter of 2015 pricing, with a internal rate of return of 25% and the payback period of 5.1 years under the best case scenario.

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Section: Introductionmentioning

confidence: 99%

“…They used lab-scale experimental data to validate their model. 28 In addition, there is a noticeable lack of energy and carbon footprint evaluations as well as techno-economic analysis studies that can determine the most efficient process for a low-rank coal drying process combined with pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

2018

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A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Yang

et al. 2018

Applied Thermal Engineering

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Particle collision behavior and heat transfer performance in a Na2SO4 circulating fluidized bed evaporator

Jiang

et al. 2022

Chinese Journal of Chemical Engineering

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Process simulation of a lignite-fired circulating fluidized bed boiler integrated with a dryer and a pyrolyzer

Cited by 9 publications

References 18 publications

Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Particle collision behavior and heat transfer performance in a Na2SO4 circulating fluidized bed evaporator

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Process simulation of a lignite-fired circulating fluidized bed boiler integrated with a dryer and a pyrolyzer

Cited by 9 publications

References 18 publications

Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

Energy Evaluation and Techno-economic Analysis of Low-Rank Coal (Victorian Brown Coal) Utilization for the Production of Multi-products in a Drying–Pyrolysis Process

A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Particle collision behavior and heat transfer performance in a Na2SO4 circulating fluidized bed evaporator

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A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system