Open AccessCoal gasification by indirect heating in a single moving bed reactor: Process development & simulation
Author(s) -
Junaid Akhlas,
Silvia Baesso,
Alberto Bertucco,
Fabio Ruggeri
Publication year - 2015
Publication title -
aims energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.294
H-Index - 9
eISSN - 2333-8334
pISSN - 2333-8326
DOI - 10.3934/energy.2015.4.635
Subject(s) - wood gas generator , flue gas , process engineering , syngas , heat exchanger , coal , air separation , waste management , process simulation , work (physics) , combustion , coal gasification , chemical looping combustion , environmental science , process (computing) , nuclear engineering , chemistry , engineering , oxygen , fluidized bed , mechanical engineering , computer science , hydrogen , organic chemistry , operating system
In this work, the development and simulation of a new coal gasification process with indirect heat supply is performed. In this way, the need of pure oxygen production as in a conventional gasification process is avoided. The feasibility and energetic self-sufficiency of the proposed processes are addressed. To avoid the need of Air Separation Unit, the heat required by gasification reactions is supplied by the combustion flue gases, and transferred to the reacting mixture through a bayonet heat exchanger installed inside the gasifier. Two alternatives for the flue gas generation have been investigated and compared. The proposed processes are modeled using chemical kinetics validated on experimental gasification data by means of a standard process simulator (Aspen PlusTM), integrated with a spreadsheet for the modeling of a special type of heat exchanger. Simulation results are presented and discussed for proposed integrated process schemes. It is shown that they do not need external energy supply and ensure overall efficiencies comparable to conventional processes while producing syngas with lower content of carbon dioxide