Modeling of combustion processes to reduce nitrogen oxide emissions from a boiler unit of the BKZ-320-140 type

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a validated CFD model for NOx formation in coal combustion, useful for further research on emission reduction and boiler optimization.

🏢実務担当者:Offers a practical, low-cost method to reduce NOx emissions in existing coal-fired boilers, potentially aiding compliance with environmental regulations.

🏛政策担当者:Demonstrates a domestic engineering solution to meet environmental standards, supporting technological sovereignty and energy strategy goals.

This article presents the results of numerical modeling of combustion processes and nitrogen oxide formation in the combustion chamber of a BKZ-320-140 boiler fired with a high-moisture brown coal from the Irbeyskoye deposit. It also provides an approximate cost-effectiveness forecast for the considered method for optimizing nitrogen oxide emissions. The objective of the study was to evaluate the effectiveness of primary methods for reducing nitrogen oxide emissions, specifically, upgrading the boiler with low-emission burners and shutting off exhaust nozzles. The modeling was performed in the ANSYS Fluent software using a verified mathematical model that takes into account multiphase flows, turbulence, coal dust combustion, and the main mechanisms of nitrogen oxide formation (thermal, fuel, and fast). The study showed that the proposed technical solution can reduce NOx concentrations in flue gases by 30 % – from 840 to 510 mg/nm³. It has been found that optimizing combustion chamber aerodynamics is a key factor in reducing emissions: reducing the tangential velocity component, minimizing reverse flow zones, and creating a stable recovery zone with an increased gas phase residence time. The developed model demonstrated an optimal agreement with operating data (average error less than 3 %). The solution discussed in this article is fully consistent with the strategic goals of the Energy Strategy of the Russian Federation through 2035 in terms of modeling energy processes and implementing best available technologies. The study demonstrates a practical way to improve the environmental efficiency of existing power units without extensive reconstruction, which is critical for the sustainable development of coal-fired generation in regions such as the Irkutsk Region. Further research involves integrating the model with slagging and corrosion assessments, as well as studying the dynamic operating modes of the boiler. This approach directly supports the policy of technological sovereignty, as it enables the achievement of stringent environmental standards using domestic engineering solutions and software, minimizing dependence on foreign gas cleaning systems.

• semanticscholar https://doi.org/10.17212/2782-2001-2026-2-83-98first seen 2026-08-14 05:51:35