Simulation Study on Gas-Solid Flow and Combustion Characteristics of Pure Oxygen Combustion Circulating Fluidized Bed Boiler

GAO Kaixuan; KE Xiwei; HOU Nana; ZHANG Yang; LI Dan; WANG Zhining; LIU Xuemin

doi:10.19805/j.cnki.jcspe.2026.250075

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Simulation Study on Gas-Solid Flow and Combustion Characteristics of Pure Oxygen Combustion Circulating Fluidized Bed Boiler

更新时间：2026-07-16

- Simulation Study on Gas-Solid Flow and Combustion Characteristics of Pure Oxygen Combustion Circulating Fluidized Bed Boiler
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 132-143(2026)
- 作者机构：
  
  1. 中国特种设备检测研究院国家市场监管技术创新中心(锅炉清洁低碳高效燃烧与安全评价),北京,100029
  2. 怀柔实验室山西研究院,山西,太原,030032
  3. 清华大学山西清洁能源研究院,山西,太原,030032
  4. 清华大学能源与动力工程系,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250075
  CLC： TK229.6
- Published：2026
- 稿件说明：
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高凯旋, 柯希玮, 侯娜娜, 张扬, 李丹, 王志宁, 刘雪敏. 纯氧燃烧循环流化床锅炉气固流动与燃烧特性模拟研究[J]. 动力工程学报, 2026, 46(7): 132-143.
高凯旋, 柯希玮, 侯娜娜, 张扬, 李丹, 王志宁, 刘雪敏. 纯氧燃烧循环流化床锅炉气固流动与燃烧特性模拟研究[J]. 动力工程学报, 2026, 46(7): 132-143. DOI： 10.19805/j.cnki.jcspe.2026.250075.

DOI： 10.19805/j.cnki.jcspe.2026.250075

摘要

为实现"双碳"目标

近年来许多碳捕集、利用与封存(CCUS)技术得到了快速发展

其中包括富氧燃烧技术。然而

常规富氧燃烧技术依赖烟气再循环系统

面临建造成本高、运行能耗高和再循环管路低温腐蚀等问题。因此

考虑取消烟气再循环装置

只用空气分离后的纯氧实现床料流化和燃料燃烧

有望降低机组整体运行能耗和CO2捕集成本。本文提供了自行设计的130 t/h纯氧燃烧循环流化床(CFB)锅炉的基本结构

并基于计算颗粒流体力学(CPFD)方法对此CFB锅炉的气固流动特性与燃烧及传热特性进行数值模拟研究。计算结果表明:纯氧燃烧CFB锅炉的下部收缩段存在明显的颗粒回流现象

炉膛上部依然呈现环核流动结构;在燃烧及污染物排放方面

炉膛整体温度分布均匀

基本维持在1 120 K左右

分离器出口氧浓度约为3.90%

NO浓度则随着炉膛高度的增加逐渐降低

出口处NO原始排放浓度约为100 mg/m3;从传热性能上看

纯氧燃烧条件下炉内受热面表面传热系数相比于传统CFB锅炉有所增加

炉底密相区埋管和水冷壁平均传热系数分别达394.8 W/(m2·K)和179.9 W/(m2·K)。研究结果为进一步掌握CFB锅炉纯氧燃烧特性、开发相关锅炉系统奠定了基础。

Abstract

To achieve the "dual carbon" goal

many carbon capture

utilization and storage (CCUS) technologies have developed rapidly in recent years

including oxygen-enriched combustion technology. However

conventional oxygen-enriched combustion technology relies on the flue gas recirculation system

which faces such problems as high construction costs

high operating energy consumption

and low-temperature corrosion of the recirculation pipelines. Therefore

eliminating the flue gas recirculation device and adopting only pure oxygen separated from air to achieve particle fluidization and fuel combustion is expected to reduce the total energy consumption and CO2-capture costs. Basic structure of a self-designed 130 t/h pure oxygen combustion circulating fluidized bed (CFB) boiler was provided

and numerical simulation research on the gas-solid flow characteristics

combustion

and heat transfer characteristics of the CFB boiler based on computational particle fluid dynamics (CPFD) method was conducted. The calculation results show that there is a significant particle reflux phenomenon in the lower contraction section of the pure oxygen combustion CFB boiler

and the upper part of the furnace still presents a core-annular flow structure. In terms of combustion and pollutant emissions

the overall temperature distribution within the furnace is uniform

basically maintained at around 1 120 K. The oxygen concentration at the cyclone outlet is about 3.90%. The NO concentration gradually decreases with the increase of furnace height

and the original emission concentration of NO at the furnace outlet is about 100 mg/m3. From the perspective of heat transfer performance

the heat transfer coefficient of the heating surface in the furnace under pure oxygen combustion conditions has increased compared to traditional CFB boilers. The average heat transfer coefficients of the immersed tubes in the dense-phase zone and surrounding water wall are 394.8 W/(m2·K) and 179.9 W/(m2·K)

respectively. The research results lay a foundation for further understanding the characteristics of pure oxygen combustion in CFB boilers and developing related boiler systems.

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references

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