Study on Combustion Characteristics and NOx Formation in 600 MW Coal-Fired Boiler Based on Numerical Simulation

Abstract

The variations in the boiler operation conditions have a great effect on the combustion characteristics and the pollutant formation in furnaces. This work aims to investigate the effects of operational parameters on NOx formation and its distribution in furnaces using the numerical simulation method to obtain the optimum control strategy for reducing NOx emissions. The numerical simulation models of pulverized coal combustion in furnaces involving flow, heat transfer, combustion and NOx formation are established. Taking a 600 MW supercritical opposed firing pulverized coal boiler as the study object, a full-scale three-dimensional physical model of the boiler is constructed with Gambit software. On this basis, the pulverized coal combustion and the NOx formation under various boiler loads are numerically simulated using the software of Ansys Fluent 2021R1, and the accuracy and the reliability of the models established are verified by comparing the simulation data with the field test data. According to the combustion numerical simulation of 128 groups of operating conditions, the effects of boiler load, the air rate and the air temperature on combustion and NOx formation have been emphatically investigated. The simulation results indicate that the formation of NOx and the NOx concentration distribution are mainly affected by the oxygen concentration and the temperature in the furnace. Especially, the effects of the variation in the excess air coefficient, the over-fire air (OFA) ratio, the primary air ratio and the internal secondary air ratio on NOx concentration distribution vary greatly. When the air temperature increases the overall NOx concentration in the furnace increases, and the influence of the secondary air temperature and the OFA temperature is greater than that of the primary air temperature. Large amounts of simulation data are a necessary data source for further study on the NOx prediction model at the economizer outlet, which can improve the prediction ability and the generalization ability of the NOx prediction model.

Laboratory Study on Adhesive Ash Deposition Characteristics of Ammonium Bisulfate in Conditions Simulating an Air Preheater for Hard Coal Combustion

“…Therefore, the amount of ammonia escape from the SCR denitrification facility must be strictly controlled to reduce the formation of the ABS. The constant changes of the boiler load can cause an uneven concentration distribution of NOx in the economizer outlet [21]. Excessive ammonia is usually injected into the SCR denitrification facility for environmental protection [28,29].…”

“…The related study results show that when the ammonia escape concentration reaches 2 ppm and 3 ppm, the air preheater operating resistance increases by about 30% and 50% after half a year, respectively [20]. The ammonia escape from the SCR denitrification system is inevitable because the amount of ammonia injected is excessive to ensure that the NO x concentration in the discharged flue gas reaches the national emission standard, which causes the formation of ABS [21]. Therefore, it is a pressing concern to solve the blockage and the corrosion resulting from the blend deposition of ABS and fly ash at the surface of the air preheater.…”

Computational fluid dynamics dataset of secondary air modification in a circulating fluidized bed boiler

“…We have modeled combustion reactions via a non-premixed combustion model [3] , following the same approach used by Zhu et al. for simulating a pulverized coal boiler [4] . The non-premixed model is applied to solve the coal particles combustion process and account for the coal properties.…”

Numerical Study and Hydrodynamic Calculation of the Feasibility of Retrofitting Tangentially Fired Boilers into Slag-Tap Boilers

“…This stark difference arises due to the higher combustion temperature and larger hightemperature region in the slag-tap boiler. The elevated temperature promotes the generation of thermal NO x [38]. Obviously, it is necessary to consider the optimization of the de-NO x system when implementing the retrofit scheme in practice.…”