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首页> 外文期刊>Nordic Pulp & Paper Research Journal >Increased capacity in kraft pulp mills: Lignin separation and reduced steam demand compared with recovery boiler upgrade
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Increased capacity in kraft pulp mills: Lignin separation and reduced steam demand compared with recovery boiler upgrade

机译：牛皮纸制浆厂的产能提高：与回收锅炉升级相比，木质素分离和减少的蒸汽需求

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摘要

For increased production in pulp mills, the recovery boiler is often a bottleneck. Two different approaches to debottleneck the recovery boiler have been investigated in two model mills that represent typical Scandinavian pulp mills. As a reference approach, the recovery boiler was upgraded. In connection with this, the turbine system was also upgraded to enable increased electricity production. As an alternative to this conventional approach, the load of the boiler was kept constant by extracting lignin from the black liquor in proportion to the production increase. To keep the steam balance, the specific steam consumption at the mill was reduced through steam-saving measures to such an extent that the amount of steam produced from burning the lignin-lean black liquor was sufficient. Consequently, the extracted lignin was not needed in-house and could be sold as a biofuel. The net profit of implementing lignin separation was calculated for different conditions. The result was that, depending on the conditions, the lignin price had to be 2-17 ?/MWh for lignin separation to be equally profitable as boiler upgrade. With an assumed lignin price of about 15 ?/MWh, the conclusion is that lignin separation should be an economically attractive alternative for debottlenecking the recovery boiler. With a high power price and a long-term investment strategy, however, upgrading the recovery boiler and the turbine system can be more profitable.
机译：为了增加纸浆厂的产量，回收锅炉通常是瓶颈。在代表典型的斯堪的纳维亚纸浆厂的两个模型工厂中，已经研究了两种消除瓶颈的方法。作为参考方法，对回收锅炉进行了升级。与此相关的是，涡轮系统也进行了升级，以增加电力生产。作为这种常规方法的替代方案，通过与生产增加成比例地从黑液中提取木质素来保持锅炉的负荷恒定。为了保持蒸汽平衡，通过节省蒸汽的措施将工厂的特定蒸汽消耗降低到一定程度，从而使燃烧贫木质素的黑液产生的蒸汽量足够。因此，提取的木质素无需内部使用，可以作为生物燃料出售。计算不同条件下实施木质素分离的净利润。结果是，根据条件的不同，木质素分离的木质素价格必须为2-17升/兆瓦时，才能与锅炉升级一样获利。假定木质素价格约为15升/兆瓦时，结论是木质素分离对于降低回收锅炉的瓶颈是一种经济上有吸引力的选择。但是，凭借高昂的电价和长期的投资策略，升级回收锅炉和涡轮系统可能会更有利可图。

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