摘要
本文报导了两种不同飞灰（神府飞灰，东山飞灰），以二氧化碳、水蒸汽及其混合物为气化介质，于热天平上９００～１０００℃条件下进行气化动力学的研究。结果发现，飞灰的气化速率随转化率的增大而降低，呈直线关系，提高温度２０℃或气体分压０．２ＭＰａ，反应速率相应提高１倍左右及０．１～０．３倍。单组分气体的反应速率与温度、气体分压和转化率的关系如下：ｄｘ／ｄｔ＝Ｋ＿０×ｅｘｐ（－Ｅａ／ＲＴ）×Ｐｉｎ×（１－ｘ）￣ｍ而混合气体的气化反应动力学方程式如下：ｄｘ／ｄｔ＝Ｋ＿（０ＣＯ＿２）×ｅｘｐ（－Ｅａ＿（ｃｏ＿２）／ＲＴ）×（１－ｘ）￣（ｍｌ）×Ｐｉ＿（ｃｏ＿２）＋Ｋ＿（０Ｈ＿２Ｏ）×ｅｘｐ（－Ｅａ＿（Ｈ＿２Ｏ）／ＲＴ）×（１－ｘ）￣（ｍ２）×Ｐｉ＿（Ｈ＿０２Ｏ）并由此推测出提高飞灰碳转化率的反应条件及颗粒停留时间。
In this paper, a study on the gasification kinetics of two different fly ash (Shenfu and Dongshan fly ash) is reported.The gasification is carried out in a thermo-balance with CO2, H2O and their mixture,The reaction temperature is from 900 to 1000℃. The gasification reaction rate decreases with an increasing in carbon conversion,with an approximately linear relationship.Increasing the temperature by 20℃ or the reactant gas pressure by 0.02 MPa will raise the reaction rate by 1 time or 0.1 to 0.2 times.respectively,The relationship of dx/dt vs x, temperature and pressure under a single reactant gas is: dx/dt=K_0×exp(-Ea/RT)×(1-x)￣m The equation of gasification reaction kinetics is: dx/dt=K_(0CO_2) ×exp(-Ea_(co_2)/RT)×(1-x)￣(ml)×Pi_(co_2)+K_(0H_2O)×exp(-Ea_(H_2O)/RT)×(1-x)￣(m2)×Pi_(H_02O) From the equation we can determine the reaction conditions and particle residence time for increasing carbon conversion of fly ash.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1996年第3期225-232,共8页
Journal of Fuel Chemistry and Technology
关键词
飞灰
气化反应
动力学
流化床气化炉
气化炉
fly ash, gasification reactivity, gasification reaction kinetics
