| 垃圾焚烧炉掺烧陈腐垃圾及其配风优化的数值模拟 |
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| 引用本文： | 李德波,陈兆立,陈智豪,冯永新,黄梓淦,韦琛,马晓茜.垃圾焚烧炉掺烧陈腐垃圾及其配风优化的数值模拟[J].环境工程,2022,40(11):113-119. |
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| 作者姓名： | 李德波 陈兆立 陈智豪 冯永新 黄梓淦 韦琛 马晓茜 |
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| 作者单位： | 1. 南方电网电力科技股份有限公司, 广州 510080; |
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| 基金项目： | 国家自然科学基金重点项目（51376161）；中国南方电网公司重点项目（NYJS2020KJ005） |
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| 摘 要： | 以某350 t/d的垃圾焚烧炉为研究对象，采用CFD模拟方法研究了城市生活垃圾掺烧填埋场陈腐垃圾及不同配风方案对燃烧过程、流场分布及NOx排放规律等影响。结果表明:掺烧陈腐垃圾延后了床层焦炭燃烧过程，有利于挥发分析出，从而使燃烧区及烟道气相燃烧更剧烈，提高了炉膛整体温度，但也加剧了局部超温，同时一烟道出口NOx浓度从247.85 mg/Nm3降低到198.75 mg/Nm3。工况4增大了上下层二次风，使燃烧区流体充分混燃，且烟道流体湍动度增大，使炉膛内温度更加均匀，有利于缓解一烟道高温腐蚀现象。合适的配风比可极大降低一烟道出口NOx浓度，使之从198.75 mg/Nm3降至89.80 mg/Nm3，同时也延长了炉膛烟气的停留时间。该研究结果可为垃圾焚烧炉改进陈腐垃圾掺烧比和配风比提供参考。
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| 关 键 词： | 陈腐垃圾 垃圾焚烧炉 氮氧化物 配风优化 数值模拟 |
| 收稿时间： | 2021-12-20 |
NUMERICAL SIMULATION OF MIXED FIRING OF AGED REFUSE AND AIR DISTRIBUTION OPTIMIZATION IN A MSW INCINERATION FURNACE |
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| Affiliation: | 1. China Southern Grid Power Technology Co., Ltd, Guangzhou 510080, China;2. School of Electric Power, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | The effects of mixed combustion of municipal solid waste (MSW) with aged refuse in landfills and different air distribution schemes on combustion process flow field distribution and NOx emission in a 350 t/d furnace were studied by CFD simulation. The results showed that adding aged refuse delayed the combustion process of char on the bed, which was conducive to the release of volatiles, so that the gas phase combustion in the combustion zone and flue became more intense. And the overall temperature of the furnace was increased, which also caused local overtemperature. At the same time, the NOx concentration at the first flue outlet decreased from 247.85 mg/Nm3 to 198.75 mg/Nm3. In working condition 4, the upper and lower secondary air was increased, so that the fluid in the combustion zone was fully mixed and burned. And the increased degree of fluid turbulence in the flue made the temperature in the furnace more uniform, which was beneficial to relieve the phenomenon of high-temperature corrosion in the first flue. An appropriate air distribution ratio could greatly reduce the NOx concentration at the flue outlet from 198.75 mg/Nm3 to 89.80 mg/Nm3, and also prolonged the residence time of flue gas in the furnace. The results could provide a reference for improving the mixing ratio of aged refuse and air distribution ratio of the refuse incinerator. |
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