Pulverized-Coal Combustion in Wall-Protecting-Jets Combustor (WPJC)

Abstract

A new type of pulverized-coal combustor, called "Wall-Protecting-Jets Combustor" (hereafter, WPJC) has been proposed, designed and studied with both CFD (Computational Fluid Dynamics) and experimental methods. The WPJC is based on a novel concept in which all inlet jets are along the combustor wall. Pilot combustion experiments were conducted to investigate the combustion performance of WPJc. Two-phase flows and pulverized-coal combustion were simulated to study the mechanism of WPJC using the commercial software FLUENT. The results show that the WPJC has many remarkable advantages: wall-protection by the cold jets without the use of refractory materials; low-temperature and three-stage combustion with low NOx emission; negligible ash/slag-deposition; multiple functions with convenient switching between them; effective adjustment of the combustion intensity and the ignition position.

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“…The high temperature and pressure within the combustion chamber constitute a multidimensional and dynamic process, which necessitates extensive time for development and design to achieve relative stability. This requires numerous numerical simulations for analysis, significantly simplifying the cost and cycle time of the design process 56,57 . Reducing the size of the combustion chamber can lead to a decrease in the surface area ratio, which in turn can cause an increase in wall heat loss and flame instability 58,59 .…”

“…This requires numerous numerical simulations for analysis, significantly simplifying the cost and cycle time of the design process. 56,57 Reducing the size of the combustion chamber can lead to a decrease in the surface area ratio, which in turn can cause an increase in wall heat loss and flame instability. 58,59 Enagi et al 60 designed and optimized a new combustion chamber geometry using a novel liquid biofuel combustion system.…”