Numerical Simulation of Combustion Characteristics of Marine Gas Combustion Units

ZHANG Shuyuan; WU Dongyin

doi:10.7652/xjtuxb202411010

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Numerical Simulation of Combustion Characteristics of Marine Gas Combustion Units

更新时间：2025-07-25

- Numerical Simulation of Combustion Characteristics of Marine Gas Combustion Units
- Vol. 58, Issue 11, Pages: 109-118(2024)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202411010
  CLC： TK16
- Online First：10 November 2024，
  
  Published：2024
- 稿件说明：
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ZHANG Shuyuan, WU Dongyin. Numerical Simulation of Combustion Characteristics of Marine Gas Combustion Units[J]. 2024, 58(11): 109-118.
DOI：

ZHANG Shuyuan, WU Dongyin. Numerical Simulation of Combustion Characteristics of Marine Gas Combustion Units[J]. 2024, 58(11): 109-118. DOI： 10.7652/xjtuxb202411010.

摘要

为了解决大型液化天然气运输船配套天然气燃烧装置设计制造技术国产化的瓶颈问题

明晰其计算方法和机理

通过数值模拟方法

研究某天然气燃烧装置的流动和燃烧特性。分析了中心风入口结构、折算过量空气系数对装置内速度场、最高温度、出口温度以及组分分布的影响

确定天然气燃烧装置的最优结构和运行参数

在及时点火而且清洁燃烧的同时保证装置的冷却效果。研究结果表明:装置结构决定辅助风与中心风的配风比

配风比随中心风入口截面积的增大而减小; 当中心风入口截面积小于0.45 m

时

配风比大于14.27

可以点火燃烧; 当中心风入口截面积大于0.5 m

时

配风比小于13

装置不能着火; 随着中心风入口截面积的增大

最高温度逐渐降低

出口CO浓度先增大后减小; 装置结构不变时

随着折算过量空气系数的增大

天然气燃烧装置的最高温度和NO浓度先增大后减小

平均温度和出口排烟温度呈线性降低; 中心风入口截面积为0.45 m

、过量空气系数为7.0是最优设计结构和最优运行工况

能有效降低装置内燃烧最高温度和出口NO等浓度。研究结果可为天然气燃烧装置国产化设计、运行和优化提供一定理论指导。

Abstract

To tackle the bottleneck issue of localizing design and manufacturing technology of gas combustion units supporting large liquefied natural gas carriers and TO clarify its calculation method and mechanism

this paper delves into the flow and combustion characteristics of a natural gas combustion unit through numerical simulation. The influence of the central air inlet structure and the reduced excess air coefficient on the velocity field

maximum temperature

outlet temperature

and comp

onent distribution within the gas combustion unit is analyzed to determine its optimal structure and operating parameters. This ensures the cooling effect of the gas combustion unit while guaranteeing timely ignition and clean combustion. The findings reveal that the distribution ratio between the auxiliary air and the central air is dictated by the unit's structure

decreasing as the cross-sectional area of the central air inlet increases. A central air inlet cross-sectional area below 0.45 m

yields an air distribution ratio exceeding 14.27

enabling ignition; however

an area above 0.5 m

results in a ratio below 13

inhibiting ignition. With an expanding central air inlet area

the maximum temperature decreases

while the CO mass fraction at the outlet initially rises and then falls. As the excess air coefficient increases

the maximum temperature and NO mass fraction exhibit an initial increase followed by a decrease

with average temperature and outlet smoke temperature decreasing linearly. Optimal design structure and operational conditions are achieved with a central air inlet area of 0.45 m

and an excess air coefficient of 7.0

effectively reducing the maximum combustion temperature within the unit and the NO mass fraction at the outlet. The research results offer theoretical insights for the design

operation and optimization of gas combustion units.

关键词

Keywords

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