Overview of advances in emission control technologies for nitric oxides from biomass boilers
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摘要: 生物質燃料中含有的燃料氮含量較低, 但是大約70%~100%(質量分數)的氮最終會轉化為NOx, 并且秸稈等生物質燃料燃燒排放的NOx含量較木質燃料等更高.此外, 近年來, 我國空氣質量面臨嚴峻態勢, NOx是常見的大氣污染物, 對居民身體健康、生產和生活有很大影響.因此, 本文對目前國內外的NOx燃燒控制技術進行綜述, 總結了各類技術的優缺點, 及我國目前對于生物質鍋爐NOx控制技術遇到的瓶頸, 并對該研究領域的未來趨勢做出展望.Abstract: Currently, fossil fuels such as oil, coal, and natural gas are the world's primary energy sources. However, it is anticipated that these energy sources will be depleted in less than 100 years. As such, the development of new energy technologies is urgently needed. Biomass is one of the earliest sources of energy, and is used especially in rural areas where it is often the only one that is accessible and affordable. With the depletion of fossil fuels and increasing environmental degradation, biomass energy is attracting increasing attention around the world. Compared with fossil fuel, biomass is carbon neutral and sustainable, and has a smaller greenhouse gas footprint and lower SO2 emission levels. In addition, biomass energy remains the only renewable green energy that can be stored and transported. A number of countries have developed mature and proven combustion technologies, but these technologies are mainly based on wood biomass fuels. Unlike these developed countries, China is a large agricultural country with a limited amount of available firewood. As such, foreign experience cannot be fully applied in China. Although biomass fuels typically have relatively low fuel-N contents, this fuel-N between 70%-100% mass fraction is converted to NOx during combustion. In addition, the combustion of straw and other biomass fuels emits more NOx than wood fuels. In recent years, the air quality in China has become a serious public health concern, and NOx is a widespread atmospheric pollutant with significant impacts on human health and the economy. In this paper, an overview of biomass combustion technologies and NOx control systems in China and around the world was presented, and their advantages and disadvantages were summarized. The main bottleneck was identified in NOx control technologies with respect to biomass boilers in China and the development of new technologies in this field was predicted.
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Key words:
- biomass fuel /
- combustion /
- nitric oxides /
- control technology /
- de-NOx
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表 1 不同來源生物質燃料工業分析、元素組成和熱值
Table 1. Statistics regarding industrial analysis index, elemental composition, and calorific value of different biomass fuels
生物質燃料 工業分析/% 熱值/(MJ·kg-1) 元素質量分數/% 參考文獻 灰分 揮發分 固定碳 C H S N 木質 原料 云杉木 1.50 70.20 29.30 20.50 51.40 6.10 0 0.30 [8-10] 白楊木 2.70 84.81 12.49 19.38 48.45 5.85 0.01 0.47 [11-12] 櫸木 0.50 82.50 17.00 19.60 49.50 6.20 0.01 0.40 [8, 13-14] 成型燃料 0.40 81.52 13.20 18.52 44.66 7.64 0.10 0.32 [15] 玉米秸稈 原料 2.80 82.20 15.00 10.73 49.40 5.60 0.10 0.60 [9, 11, 13] 成型燃料 8.96 69.18 17.62 15.29 43.76 5.60 0.18 1.09 [16] 稻草 原料 18.67 65.47 15.86 14.00 38.45 5.28 — 0.88 [8, 12, 17] 成型燃料 13.86 65.11 16.06 13.98 38.32 5.06 0.11 0.63 [18] 小麥秸稈 原料 7.02 75.27 17.71 19.30 49.40 6.10 0.17 0.70 [8, 12, 14] 成型燃料 8.90 67.36 19.35 15.37 41.28 5.31 0.18 0.65 [18] 核桃殼 原料 2.80 59.30 37.90 — 53.60 6.60 0.10 1.50 [9, 13] 成型燃料 0.68 80.88 18.44 17.60 51.11 5.80 0.05 0.20 [19] 鋸末 原料 2.80 82.20 15.00 18.02 55.34 5.83 0.00 0.09 [13, 20-21] 成型燃料 0.96 80.30 18.70 18.64 52.15 5.37 0.01 0.10 [20-21] 榛子殼 原料 1.40 69.30 28.30 19.50 50.80 5.60 0.00 1.00 [8-10] 成型燃料 2.28 20.61 77.11 19.85 53.50 6.10 — — [22] 煙煤 20.64 21.05 50.01 23.38 61.33 3.20 0.49 0.85 [18] 無煙煤 16.80 8.00 67.20 20.97 67.70 3.10 0.70 1.00 [18] 表 2 不同生物質成型燃料NOx排放情況
Table 2. NOx emission concentration of different biomass briquettes
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