混合方式对 CaO/煤焦水蒸气气化反应的影响.

The reaction rates of a bituminous coal (Inner Mongolia) steam gasification with CaO additive had been studied with a pressurized fix-bed reactor through gas products analysis. The results show that CaO additive has a sufficient effect on char steam gasification rate,and the promotion effect of CaO on char steam gasification has a positive correlation with the mixing extent between CaO and char. Compared with non-CaO gasification, the steam gasification rate of char/CaO mixture which is the product of coal/CaO co-pyrolysis increases by 182. 34%. In addition,the steam gasification rate of the mixture of CaO and char that made of coal individual pyrolysis increases by 21. 13% . The degree of Ca2+ dispersion is the main factor which impacts char steam gasification rate. Furthermore, the reaction rate of char steam gasification with CaO additive has a positive correlation with Ca/C under the condition of Ca/C =Sl .0, while there would be a decrease in char/CaO steam gasification rate when Ca/C increases to 1.2, compared with the condition of Ca/C ≤ 1. 0. Temperature plays a sufficient role on char/CaO steam gasification rate. When temperature increases from 650 °C to 750 ℃ ,the reaction rate of char/CaO steam gasification increases by 594. 67% . When steam partial pressure increases from 0. 35 MPa to 0. 50 MPa and 0. 65 MPa,the char/CaO steam gasification rates increases by 95. 86% and 204. 14% Respectively. [ABSTRACT FROM AUTHOR]