Zhou Zhijie

Development and demonstration plant operation of an opposed multi-burner coal-water slurry gasification technology

The features of the opposed multi-burner (OMB) gasification technology, the method and process of the research, and the operation results of a pilot plant and demonstration plants have been introduced. The operation results of the demonstration plants show that when Beisu coal was used as feedstock, the OMB CWS gasification process at Yankuang Cathy Coal Co. Ltd had a higher carbon conversion of 3%, a lower specific oxygen consumption of about 8%, and a lower specific carbon consumption of 2%–3% than that of Texaco CWS gasification at the Lunan Fertilizer Plant. When Shenfu coal was used as feedstock, the OMB CWS gasification process at Hua-lu Heng-sheng Chemical Co. Ltd had a higher carbon conversion of more than 3%, a lower specific oxygen consumption of about 2%, and a lower specific coal consumption of about 8% than that of the Texaco CWS gasification process at Shanghai Coking & Chemical Corporation. The OMB CWS gasification technology is proven by industrial experience to have a high product yield, low oxygen and coal consumption and robust and safe operation.

Experimental studying and stochastic modeling of residence time distribution in jet-entrained gasifier

The gasification technology of jet-entrained beds has been extensively applied to chemical production and the power generation. Residence time distribution (RTD) is required for modeling, design and optimization of jet-entrained gasifier. RTD in the gasifier was determined experimentally by impulse method. On the basis of the flow pattern, a stochastic model for RTD of materials in the gasifier has been developed, using Markov chain discrete formulation. The predicted results of Markov chain model give a reasonable fit of the experimental data, which shows that the process in the gasifier is stochastic and confirms that there are reflux and short-circuit in the gasifier and the flow pattern is inclined to perfect mixing.