Integrated Modeling Study of Desulfurization in Circulating Fluidized Bed Boilers Under Wide Load Conditions

doi:10.12096/j.2096-4528.pgt.23136

Abstract

Abstract:

Objectives With the proposal of the “carbon peaking and carbon neutrality” goal, the proportion of clean energy generation in China continues to increase. In order to promote the consumption of new energy generation, thermal power units frequently adopt the wide load peak shaving operation mode. Therefore, it is necessary to establish a SO₂ emission concentration model for coal-fired circulating fluidized bed (CFB) boilers that can adapt to wide load operation conditions to achieve ultra-low SO₂ emission of CFB units. Methods Through in-depth research on the dynamic characteristics of SO₂ generation and removal, a dynamic lumped parameter model of SO₂ emission concentration at the furnace outlet is established using mechanism analysis method combined with mass conservation equation. A comprehensive dynamic model for the entire desulfurization process from coal supply and air supply to SO₂ emission at the outlet of the desulfurization tower is established by reasonably simplifying the input of the model. The simulation verification is carried out by using the steady-state and dynamic operating condition data segments from the actual measurement data of CFB boilers. Results The established dynamic model can predict the dynamic trend of net flue gas emissions approximately 240 seconds in advance. Conclusions The model can reflect the dynamic characteristics of the desulfurization process in the furnace, and has certain applicability under wide load conditions.

Key words: coal-fired power generation, thermal power unit, circulating fluidized bed (CFB), SO₂ emission characteristics, dynamic modeling, wide load integration, pollutant emission

CLC Number:

TK 39

Shuaining ZHANG, Mingming GAO, Yongquan WANG, Weihua WANG, Haoyang YU, Zhong HUANG. Integrated Modeling Study of Desulfurization in Circulating Fluidized Bed Boilers Under Wide Load Conditions[J]. Power Generation Technology, 2025, 46(4): 849-856.

Figures/Tables 6

References 32

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误差指标	原烟气SO₂排放浓度模型	净烟气SO₂排放浓度模型
MAE/(mg/m³)	178.75	2.89
RMSE/(mg/m³)	229.45	4.04
MAPE/%	9.35	25.86

误差指标	原烟气SO₂排放浓度模型	净烟气SO₂排放浓度模型
MAE/(mg/m³)	178.75	2.89
RMSE/(mg/m³)	229.45	4.04
MAPE/%	9.35	25.86