Research Of Combustion Characteristic Testing On The Tiny Oil Ignition Burner

Thermal power unit in China needs to consume a large amount of heatingoil in the process of cold start-up and low-load stable-combustion. Tiny-oil ignitiontechnology is a kind of innovation of traditional pulverized coal fired boiler ignitiontechnology, which is a effective method to save energy, reduce power generation cost.In this paper, pulverized coal combustion characteristic has carried on the thoroughdiscussion by the method of numerical simulation and field experiment. Main workand conclusions are as follows:The primary combustion chamber ignition performance of the tiny-oil ignitionburner is numerical studied by Fluent，when the parameters changed. By analyzingthe calculation results of the characteristics of pulverized coal combustion, we gotthe best length of primary combustion chamber was1000mm, The best parametersfor running was15m/s air speed,0.15kg/kg pulverized coal concentration,70℃airtemperature,70μm average particle size of pulverized coal. Primary combustionchamber outlet heat flow can meet the requirements of the next combustion chamberignition.The primary combustion chamber ignition performance of the tiny-oil ignitionburner is studied by experiment, when the primary air velocity and pulverized coalconcentration changed. The results of the study show that: when the primary airvelocity and pulverized coal concentration changed. The results of the study showthat: The temperature is reduced at first, then increased, with the increase of theprimary air velocity and pulverized coal concentration. The center concentration ofCO is increased with the increase of the primary air velocity, but reduced with theincrease of the pulverized coal concentration. The center concentration of NOxisincreased with the increase of both primary air velocity and pulverized coalconcentration.Experimental studies were carried out on a600MW boiler that was transformedby the technology of tiny-oil ignition. The combustion status, variation of steamtemperature and pressure, and wall temperature of heat exchange surfaces wereinvestigated. Test results demonstrated that the pulverized coal is able to becombusted fully and stably in the oil-saving ignition combustor, at a wide range of pulverized coal concentration from0.2to0.6kg/kg. It was also shown that the walltemperature of heat exchange surfaces is also not overheated, which expandsuniformly, and the rising rate of the steam temperature satisfies the requirement ofoperation rules. In addition, compared to the cases using conventional ignitiontechniques, the economical benefit by employing the technology of oil-savingignition is pronounced.