There are several factors which influence the combustion charateristics of coal-biomass compound brequet. In this study, the influence on coal-biomass briquets combustion characteristics of different factors were examined by orthogonal experiments, with volatile rate, burnout rate and combustion time as targets. The results showed that component of biomass and hearth temperature had significant influence, well variety of biomass and shaping pressure had slight influence to all targets. The results have theoretical worth to design and run boilers using coal-biomass compound briquets.

The performance of internal combustion (IC) engine is influenced by the characteristic of the intake process. The intake process of is very complex because the pressure waves transmission and reflection lead to pulsation and resonance in the pipes. The intake quality is directly related to the structure size of intake ports. The objective of this study is to use a one-dimensional simulation methodology to optimize the intake ports structure of a four-cylinder gasoline engine equipped with turbocharger and intercooler. Steady-state simulation was performed and the results were verified by the experiment data. The impact of the structure size of intake ports on power performance was identified and analyzed. The length of intake ports influences the pressure wave in the intake ports, and then the volumetric efficiency was impacted. The length of the intake port is inversely proportional to the resonance frequency, which means the longer the pipe is, the smaller the resonance frequency is, and then the lower engine velocity the resonance point moves to. This analytical methodology has significant advantages and can be applied to optimize the structure and the performance of the engine.