Coal gasification characteristics in a thermobalance and a cyclone reactor = 열천칭과 싸이클론형 반응기에서의 석탄가스화 반응 특성

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 274
  • Download : 0
The kinetic parameters of heterogeneous catalytic and/or non-catalytic char-gas reactions (C-$H_2O$, C-$CO_2$ and C-$O_2$) are determined using a thermobalance. The effects of key experimental variables such as coal rank, particle size, temperature, heating rate, reactant gas concentration, catalyst type and the amount of catalyst loading on these rate processes are investigated. The generalized equilibrium prediction model is developed to calculate the equilibrium composition of complex gasification products with the variation of temperature, pressure and feed condition. The cyclone gasifier model is developed to estimate the product gas composition and the carbon conversion with the variation of operating conditions. Basic calculated values of concentration and conversion of the char-$H_2O$-$O_2$ reaction in a cyclone gasifier are provided with the variation of operating conditions such as temperature and mole ratio of the reactant materials, with which to evaluate its potential application to industrial needs. Reaction kinetics of char-$CO_2$ gasification at atmospheric pressure are investigated in a 5.5 cm-ID thermobalance reactor using four ranks of coals. Effects of coal ranks (lignite-semianthracite), particle size (0.18-1.00 mm), reaction temperature (700-900℃), and concentration (30-100 %) of the reactant gas ($CO_2$) on the conversion rate of char gasification are determined. The gasification reaction order and the reaction rate constant are determined from the conversion data, and the activation energy of the reaction is determined from the Arrhenius plot. Chemical reactivity of the char is correlated with the carbon content of the parent coals, particle size, partial pressure of $CO_2$ and reaction temperature. The experimental conversion data are well represented by the unreacted shrinking core model in which chemical reaction is the rate controlling step. Three different catalysts ($K_2CO_3$, $Na_2CO_3$, $Li_2CO_3$) and its mixture [$(Na,K)_...
Advisors
Kim, Sang-Doneresearcher김상돈researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1989
Identifier
61323/325007 / 000795503
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 1989.2, [ xii, 211 p. ]

URI
http://hdl.handle.net/10203/29200
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=61323&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0