Progress and recent trend in MILD combustion

Abstract

Moderate or intense low oxygen dilution (MILD) combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs. However, due to the lack of the fundamental knowledge on this combustion, there is a misconception that MILD combustion should be established by high preheating of the air, which has limited its application. Our research and development on this combustion has been performed for several years. We have found that the requirements for establishing the MILD combustion are more relaxed than previously. It is also revealed that this combustion of different type, i.e., non-premixed, partially premixed and fully premixed, can be achieved by firing various fuels (i.e., gaseous, liquid and solid fuels). It is suggested that the application of the MILD combustion can be expanded significantly. The present review summarizes the progress and recent trend made in the R&D of this combustion and recommends further fundamental studies for improving our knowledge and widening its applications. high temperature air combustion, flameless oxidation, flameless combustion, oxy-fuel combustion Citation: Li P F, Mi J C, Dally B B, et al. Progress and recent trend in MILD combustion.

Review of the New Combustion Technologies in Modern Gas Turbines

“…In spite of a number of activities for industrial furnaces, the application of flameless combustion in the gas-turbine combustion system is in the preliminary phase [44]. The results from techno-economic analysis of Wang et al showed that the COSTAIR and FLOX cases had technical and economic advantages over SCR [45].…”

“…The results from techno-economic analysis of Wang et al showed that the COSTAIR and FLOX cases had technical and economic advantages over SCR [45]. Luckerath, R., et al, investigated flameless combustion in forward flow configuration in elevated pressure up to 20atm for application to gas turbine combustors [44,46]. In a novel design of Levy et al that named FLOXCOM, flameless concept has been proposed for gas turbines by establishing large recirculation zone in the combustion chamber [47,48].…”

Experimental Investigation of the Influence of Combustor Cooling on the Characteristics of a FLOX©-Based Micro Gas Turbine Combustor

“…An important influence factor for this behaviour is the exhaust gas recirculation rate which is enhanced by higher jet velocities and higher air numbers [11], respectively. Increasing recirculation serves to enhance the dilution of the fresh gas jets by hot flue gases [23] reducing the chemical reaction rates [24]. Simultaneously, rising jet velocity decreases the fluid dynamic time scale.…”

Recent progress on renewable energy in engineering thermophysics

“…In the field of biomass [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64], Luo et al [50] estimated the annual generation of crop residues, animal manure and organic faction of MSW in Hebei Province, China from 2002 to 2007. Qiao et al [51] investigated the biogas recovery from microwave heated sludge by anaerobic digestion.…”

“…Qiao et al [51] investigated the biogas recovery from microwave heated sludge by anaerobic digestion. Li et al [52] reviewed the progress and recent trend in MILD combustion. Other relative fundamental researches such as combustion can be found in [53][54][55][56][57][58][59][60][61][62][63][64].…”