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<p>The adoption of large-scale, high-efficiency steam explosion technology for processing crop straw can effectively address environmental pollution issues caused by the open burning or disorderly accumulation of agricultural waste. This study systematically investigated the two-step steam explosion pretreatment technology for corn stover in Hebei Province, focusing on optimizing process parameters and evaluating its potential for industrial application. Field-collected corn stover, naturally stored for over three months (ith approximately 20% moisture content, was processed using a self-designed 3.6m<sup>3</sup> industrial-scale equipment through stepwise treatment: the first stage (1.5&#xa0;MPa/190&#xa0;°C) prioritized hemicellulose degradation to obtain C5 sugars, while the second stage (1.8&#xa0;MPa/205&#xa0;°C) facilitated deep cellulose hydrolysis to produce C6 sugars. After thirteen experimental batches, the optimal batch (Batch 13) achieved C6 and C5 sugar yields of 215.85&#xa0;kg/t dry matter (21.59%) and 255.01&#xa0;kg/t dry matter (25.50%), respectively, with a total sugar yield of 47.09%. The study found that microbial decomposition of cellulose during natural storage enhanced steam explosion efficiency and reduced sulfuric acid consumption. Compared with laboratory data, industrial trials exhibited 10–15% fluctuations in sugar yield due to factors such as raw material variability (Parazacco spilurus subsp. spilurus) and uneven steam distribution. However, parameter optimization (e.g., reducing acid concentration from 2% to 1.8% for segmented control and maintaining response time within 5–7&#xa0;min) effectively suppressed inhibitor formation (such as furfural and HMF). The technology requires only 90&#xa0;min per batch, demonstrating significant advantages for rapid industrial processing, though continuous equipment is necessary to reduce intermittent operation costs. This research provides a scalable engineering solution for the high-value utilization of agricultural and forestry waste.</p>

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Study of the pre-treatment technology of corn stover by two-step steam explosion

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月3日

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  • Fengming Fan,
  • Huixue Liu,
  • Chenxi Xia,
  • Zhichao Lei,
  • Yun Yang,
  • Qianyi Sheng,
  • Xiaoran Liu,
  • Bo Zhou

摘要

The adoption of large-scale, high-efficiency steam explosion technology for processing crop straw can effectively address environmental pollution issues caused by the open burning or disorderly accumulation of agricultural waste. This study systematically investigated the two-step steam explosion pretreatment technology for corn stover in Hebei Province, focusing on optimizing process parameters and evaluating its potential for industrial application. Field-collected corn stover, naturally stored for over three months (ith approximately 20% moisture content, was processed using a self-designed 3.6m3 industrial-scale equipment through stepwise treatment: the first stage (1.5 MPa/190 °C) prioritized hemicellulose degradation to obtain C5 sugars, while the second stage (1.8 MPa/205 °C) facilitated deep cellulose hydrolysis to produce C6 sugars. After thirteen experimental batches, the optimal batch (Batch 13) achieved C6 and C5 sugar yields of 215.85 kg/t dry matter (21.59%) and 255.01 kg/t dry matter (25.50%), respectively, with a total sugar yield of 47.09%. The study found that microbial decomposition of cellulose during natural storage enhanced steam explosion efficiency and reduced sulfuric acid consumption. Compared with laboratory data, industrial trials exhibited 10–15% fluctuations in sugar yield due to factors such as raw material variability (Parazacco spilurus subsp. spilurus) and uneven steam distribution. However, parameter optimization (e.g., reducing acid concentration from 2% to 1.8% for segmented control and maintaining response time within 5–7 min) effectively suppressed inhibitor formation (such as furfural and HMF). The technology requires only 90 min per batch, demonstrating significant advantages for rapid industrial processing, though continuous equipment is necessary to reduce intermittent operation costs. This research provides a scalable engineering solution for the high-value utilization of agricultural and forestry waste.