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可调回流区分级着火燃烧技术在贫煤锅炉深度调峰改造中的应用

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可调回流区分级着火燃烧技术在贫煤锅炉深度调峰改造中的应用

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Application of adjustable recirculation zone staged ignition combustion technology in deep peak regulation retrofit of lean coal-fired boilers

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doi: 10.19666/j.rlfd.202605113

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【目的】以贫煤锅炉深度调峰改造成功案列为依托，从技术原理、数模研究、工程应用情况等对可调回流区分级着火燃烧技术进行分析、研究，为该技术在亚临界锅炉燃用贫煤超低负荷下实现不投油稳定燃烧改造中的应用提供可行性支撑。

【方法】采用构建精细化CFD模型对30%ECR工况进行全炉膛燃烧数值模拟，分析流场、温度场及水冷壁热负荷变化。研究了可调回流区分级着火燃烧器的原理，并与数值模拟研究相融合，指导工程应用改造。

【结果】数值模拟结果表明，30%ECR工况燃尽率达99.86%，CO质量浓度仅4.38 mg/m3。改造后，30%ECR负荷稳燃试验表明，燃用贫煤时，不投油最低电负荷降至90 MW，炉膛负压波动正常，脱硝全程投运且排放达标。

【结论】可调回流区分级着火燃烧器通过钝体开缝形成主动分级着火机制及可调周界风设计，达到了低负荷强化稳燃与高负荷防结渣的目的。修正后的锅炉效率为91.47%，实现锅炉宽负荷高效运行。改造达到了预期目的，为同类贫煤锅炉深度调峰改造提供技术参考。

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[Objective] Deep peak regulation has become an essential operational requirement for thermal power units to adapt to the large-scale grid integration of new energy sources. Lean coal-fired subcritical boilers frequently encounter unstable combustion and require auxiliary oil ignition during ultra-low load operation, which restricts the flexible peak-shaving capacity of power plants. Taking a successful deep peak regulation renovation project of a lean coal-fired boiler as the research basis, this paper conducts a comprehensive study on the adjustable recirculation zone staged ignition combustion technology. It systematically elaborates the core content of the technology from three key dimensions: technical working principle, computational numerical simulation, and practical engineering application effects. This research aims to validate the technical feasibility of applying the proposed technology to realize full oil-free stable combustion for subcritical lean coal-fired boilers under ultra-low load conditions, and to provide reliable technical support and practical guidance for the promotion and implementation of similar boiler renovation projects.

[Methods] In this study, a high-precision refined Computational Fluid Dynamics (CFD) model was established to carry out full-furnace combustion numerical simulation under the typical ultra-low load condition of 30% Economic Continuous Rating (30% ECR). Based on the simulation calculation data, the dynamic variation characteristics of furnace internal flow field distribution, combustion temperature field uniformity, and water wall heat load were comprehensively analyzed. In addition, the structural composition and stable combustion mechanism of the adjustable recirculation zone staged ignition burner were expounded in detail, and the field operation data and test results of the engineering renovation were summarized and analyzed to verify the practical performance of the technology.

[Results] The numerical simulation results demonstrate that excellent combustion performance is achieved at the 30% ECR ultra-low load working condition. Specifically, the pulverized coal burnout rate reaches 99.86%, and the flue gas carbon monoxide (CO) concentration is as low as 4.38 mg·m-3, indicating thorough fuel combustion. The field steady combustion tests conducted at 30% ECR load after technical renovation further verify the remarkable practical effect. When the boiler operates with lean coal, the minimum oil-free stable combustion electric load is successfully reduced to 90 MW. During the whole ultra-low load operation period, the furnace negative pressure fluctuates steadily within the normal safe range. The denitrification system can maintain continuous and stable operation, and all flue gas emission indicators fully meet the national ultra-low emission standards.

[Conclusion] The adjustable recirculation zone staged ignition burner adopts a slotted bluff body structure to construct an active staged ignition mechanism, combined with a flexible adjustable perimeter air design. The innovative structural design effectively solves two key operational problems of lean coal-fired boilers, realizing stable combustion reinforcement under low load conditions and preventing furnace slagging under high load conditions. After the renovation, the corrected thermal efficiency of the boiler reaches 91.47%, which realizes high-efficiency and stable operation of the boiler in a wide load range. All operational indicators of the renovated boiler fully meet the design expectations. This study provides a valuable and practical technical reference for the deep peak regulation transformation of the same type of subcritical lean coal-fired boilers, and has good engineering application and promotion value.

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. 可调回流区分级着火燃烧技术在贫煤锅炉深度调峰改造中的应用. 热力发电, : - . DOI: 10.19666/j.rlfd.202605113

. Application of adjustable recirculation zone staged ignition combustion technology in deep peak regulation retrofit of lean coal-fired boilers[J]. Thermal Power Generation, : - . DOI: 10.19666/j.rlfd.202605113

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doi: 10.19666/j.rlfd.202605113

首发时间：2026-11-04

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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