Haibin Li

Biomass Pyrolysis in an Argon/Hydrogen Plasma Reactor

This paper presents the experimental results of biomass pyrolysis in a laboratory argon/hydrogen plasma reactor. The samples tested were wood and rice husk. The gaseous product was found to contain mainly H2, CO, C2H2 and CH4. The conversion of carbon and oxygen from the biomass feed to gaseous product can reach up to 79 % and 72 %, respectively. The results indicate that plasma pyrolysis of biomass may be a useful way for gaseous fuel production.

Heat-Balance Model and Intelligence Optimization for the Wastes-Incineration and Power Generation System

Aiming to obtain an optimum balance between economical profit and environmental protection, a cost-profit model based on heat balance is built up for urban refuse incineration power system, in which the air preheat temperature and oil consumption are taken as parameters, while the maximization of the incomes of the station is taken as the objective. Considering the steady burning as constraint, the influence of the varieties of throwing oil, as well as the electric price adjusting on optimum operation parameters and profits are analyzed according to the running process of urban refuse burning power plant. Three different government’s subsidy and punishments mode are introduced into the model due to the emission of trace organic matter to analyze the influence on the power station’s best running parameters and on the behavior of the power plants. Results reveal that the government’s subsidy to garbage treatment can restrain the function ways of rubbish power station effectively.Copyright

Study on Material Motion and Combustion Characteristics in Rotary Kiln

We study the solid waste stream in a rotary kiln with L/D ≥ 10 in this paper. The particle trace is determined based upon the vector force analysis on it, and therefore, the distance and time of single particle motion in a circle are deduced. Using filling method, the mean distance and the mean residence time of material flow are then calculated, in which the motion results from the material beyond the critical angle of motion θ falling because of the kiln’s rotation. The influence of the filling angle of particles on the axial velocity is also analyzed. At the same time some experiments on different solid waste streams in the rotary kiln are carried on so that the equation of flow derived by theoretical analysis is modified according to the experimental results. Industrial analysis is done on several typical kinds of solid waste from two paper plants. Moreover, on a small scale rotary burning device, we conducted hot test on the solid waste from the paper plants to study the dependence of burnout rate on the residence time and the temperature inside the kiln. The results indicate that the water content and volatile content are high in the solid waste from paper plants. Hence, to ensure the high burnout rate, the solid waste has to stay in a rotary kiln for a long enough residence time at high temperature, which requires, in turn, that the rotary velocity of a rotary kiln be lower than 10 rpm, the inclination angle less than 2°, and the temperature inside higher than 800 °C. In addition, we conducted hot test on typical municipal residential waste in South China, from which we come to the conclusion that without enough air supply, clinker and slag are formed when the inside temperature is 850 °C.© 2003 ASME