Experimental study on pulverized coal swirl-opposed combustion preheated by a circulating fluidized bed. Part A. Wide-load operation and low-NOx emission characteristics

Zhu, Shujun; Hui, Jicheng; Lyu, Qinggang; Ouyang, Zhen; Zeng, Xiongwei; Zhu, Jianguo; Liu, Jingzhang; Cao, Xiaoyang; Zhang, Xiaoyu; Ding, Hanfeng; Liu, Yuhua

doi:10.1016/j.energy.2023.128573

Cited by 8 publications

(2 citation statements)

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“…Pyrolysis gas is not only a reducing agent that promotes the conversion of Fuel-N to N 2 , but it also has a high calorific value that enhances char burnout and improves unit economics. This is one of the key advantages of preheating combustion technology [10,47]. Figure 9a shows the gas-phase mole fractions at different loads.…”

Section: Pyrolysis Gas Analysismentioning

confidence: 99%

“…When the load is below 45%, the flue gas temperature at the SCR inlet will be below the active temperature of the catalyst. This reduces the efficiency of the denitrification system, resulting in NO x emissions exceeding acceptable limits [10]. Moreover, when the boiler operates outside its design load, the reduced efficiency of the unit creates additional economic costs.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study on Preheating Burner Characteristics for Peak Shaving

Yao,

Han,

Tang

et al. 2024

Processes

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With the proportion of renewable energy power in the electricity market gradually increasing, coal-fired power is transforming from primary to basic power, with it providing peak and frequency shaving. However, most current methods for peaking below 50% load have been applied industrially, sacrificing the efficiency of the unit. This is not in line with the goals of energy conservation and emission reduction. Therefore, this study proposes a new preheating-based peaking method. This study experimentally and simulatively explores the flow characteristics, pyrolysis gas law, and NOx emission characteristics of a preheating burner at 40–100% load. The results show that the burner has a significant preheating effect, producing high-temperature char and large amounts of pyrolysis gas. As the load decreases, the burner exit temperature increases, whereas the airflow stiffness decreases. There is little variation in the pyrolysis gas concentration between 40% and 100% loads. The NOx concentration at the burner outlet increases and the reduction efficiency decreases with decreasing load. At 40% load, NOx emissions are 91.53 mg/Nm3 and the reduction efficiency reaches 95.9%. Therefore, preheating is an economical, stable, and low-NOx-emission-peaking method. This study provides theoretical guidance for the application of preheating burners for the 40–100% load peaking of coal-fired units.

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Section: Pyrolysis Gas Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%