文献类型：会议论文

英文题名：Exact title of paper: Dynamic simulation of opposed multi-burner coal-water slurry gasification system

作者：Dai, Zhenghua[1]; Yang, Junyu[1]; Li, Chao[1]; Liang, Qinfeng[1]; Yu, Guangsuo[1]

机构：[1] Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

会议论文集：32nd Annual International Pittsburgh Coal Conference: Coal - Energy, Environment and Sustainable Development, IPCC 2015

会议日期：October 5, 2015 - October 8, 2015

会议地点：Pittsburgh, PA, United states

语种：英文

外文关键词：Computational fluid dynamics - Reaction kinetics - Temperature control - Controllers - Carbon - Gasification - Markov processes - Residence time distribution - Storms - Dynamic models - Oxygen - Coal - Stochastic models

摘要：The opposed multi-burner (OMB) coal-water slurry (CWS) gasification system has advantages in large capacity, high carbon conversion and high operation flexibility. There are four burners in symmetrical distribution on middle-upper part of the OMB CWS gasifier. The high temperature syngas from the gasifier is quenched in the quench chamber and then purified by a mixer, a cyclone and a water scrubber. This work presents a steady-state model of a commercial-scale OMB CWS gasifier and a dynamic model of the gasification system. A general reactor network model (RNM) with detailed reaction kinetics is established for the gasifier. The particle and gas residence time distribution(RTD) of RNM are obtained by the Markov chain stochastic model, which is validated by that of CFD model. The steady-state model is validated with the industrial data(6.5MPaG, 1500TPD gasifier). Then the steady-state model is transformed into the dynamic model which adopts pressure driven solution. Based on the dynamic model, the specific online reset process (ORP) of the gasifier is studied firstly. ORP means that one couple of burners may be out of service triggered by security system, through ORP, this couple of shut-off burners can be online reset; meanwhile, the other couple of burners are always running. In addition, a temperature control strategy is established by using oxygen flow rate as the control variable. The dynamic responses of gasification system to the ±1.5% disturbances of the CWS concentration and ±5% disturbances of coal calorific value are investigated for temperature controller. The tendency of inlet oxygen flow rate, operation pressure, operation temperature, carbon conversion and CO+H2 flow rate are obtained through the dynamic simulation. The simulation results indicate that the fluctuation ranges of the operation temperature and pressure of the gasifier are reasonable and the gasifier can be operated in security with liquid slagging. The ORP and temperature controller are effective and feasible.