Review Of Combustion Research Articles

From Flames to Fuels: A Review of Combustion in Energy Generation

This review paper delves into the nuanced world of combustion in energy generation, exploring the different kinds and their respective influences and utilization. It spans from complete type to explosive combustion, each imparting specific features, environmental implications, and technological advancements. Complete-type combustion, renowned for its cleanliness, contrasts sharply with the hazardous incomplete combustion. Whereas, rapid combustion is extremely good for enhancing engine performance, and spontaneous combustion is marked by its natural incidence without outside triggers. Explosive combustion, prominent by its rapid response rates, underscores the complexity and risks inherent in certain combustion techniques. The paper similarly investigates catalysts, fuel enhancements, and technological innovations aimed toward optimizing combustion performance and reducing environmental detriments. This complete review presents a deep dive into the combustion mechanisms, their utilization, and the ongoing research aimed at mitigating their environmental affects while enhancing efficiency in energy generation systems.

A Review of Combustion and Flame Spread over Thermoplastic Materials: Research Advances and Prospects

As thermoplastic materials are widely used in buildings, the fire hazards of thermoplastic materials are increasingly becoming a central issue in fire safety research due to their unique pyrolysis and melting mechanisms. In this paper, the features and common types of thermoplastic materials are introduced first. Then, the combustion behavior of thermoplastic materials is theoretically analyzed based on the empirical formulas and heat balance equations, such as the pyrolysis kinetics, ignition time, melting and dripping, flame, burning rate and mass loss rate, temperature and heat flow, gas products, and influencing factors. The influencing factors basically include the sample properties (width, incline angle, and thickness, etc.), the façade structure (sidewalls, curtain wall, etc.), the ambient conditions (altitude, pressure, and gravity, etc.), and the flame retardant treatment. Similarly, this study also illustrates the vertical and horizontal flame spread behavior of the thermoplastic materials and the influencing factors. The utilized methods include the experimental methods, the analytical methodologies, and the approaches for numerical simulation. Finally, the problems encountered at this stage and worthy of further study in the future are presented.

A Review of Combustion of Single Coal Particles in Fluidized Beds

The state of the art of the theory of the process of combustion of single coal particles in fluidized beds is reviewed. The process of combustion of coal is divided into two stages: devolatilisation, and burning of the char. The devolatilisation and the subsequent combustion of the volatile matter takes an order of magnitude less time than that for burning of the char. Therefore, the burning of char dominates the characteristics and performance of the combustor. Generally, the combustion of char is found to be controlled by the mass transfer to and reaction on the external surface if the area of pores in the char is less than 0.3 × 106m2/m3. Existing information suggests that in a fluidized bed oxygen diffuses to the carbon surface and it enters into heterogeneous reaction with carbon producing mainly CO. The carbon monoxide burns to CO2 in a diffusion flame surrounding the char particle. The surface temperature of the char, which is always higher than the bed temperature, is found to increase with decreasing size of the char, but it may start decreasing again if the site of CO oxidation moves away from the char surface for very small char particles. The mass transfer rate to the char particles may be calculated by considering the radial variation of local voidages, but this effect is significant only in limited cases.