Simulating hydrothermal treatment of sludge within a pulp and paper mill
Simulating hydrothermal treatment of sludge within a pulp and paper mill
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DOI：
10.1016/j.apenergy.2016.04.017
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发表时间：
2016-07
期刊：
影响因子：
11.2
通讯作者：
M. Mäkelä;K. Yoshikawa
中科院分区：
文献类型：
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作者：
M. Mäkelä;K. Yoshikawa
在纸浆和造纸工业中，污泥的水热处理对于不同的污泥类型可以具有广泛的可能的反应器固体负载。这项工作的目的是确定反应器温度和固体负荷对污泥水热炭的性质的影响，并模拟纸浆和造纸厂内的污泥的水热处理。首先在反应器温度和固体负荷范围分别为180-260 °C和10- 50%的情况下进行实验室实验，并通过比较平行的工厂规模模拟来确定污泥处理的效果。结果表明，反应器温度和固体负荷对污泥水热炭的固体、灰分、碳和能量产率均有显著影响。增加固体负载使碳溶解到液相中最小化，并增加所获得的水热炭的固体和能量产率。在9 m3间歇式反应器中进行的工厂规模模拟表明，单独处理初沉污泥产生的剩余能量为22-36 GJ，混合污泥和二沉污泥分别减少到12-22 GJ和3.4- 9.1GJ。与在两个反应器中分别处理污泥流相比，混合初级和二级污泥减少了2-8%的总能量剩余。
Hydrothermal treatment of sludge within the pulp and paper industry can have a wide range of possible reactor solid loads for different sludge types. The objectives of this work were to determine the effect of reactor temperature and solid load on the properties of sludge hydrochar and to simulate hydrothermal treatment of sludge within a pulp and paper mill. Laboratory experiments were first performed within reactor temperature and solid load ranges of 180–260 °C and 10–50%, respectively, and the effects of sludge treatment were determined by comparing parallel mill-scale simulations. Based on the results, both reactor temperature and solid load had a statistically significant effect on the solid, ash, carbon and energy yields of sludge hydrochar. Increasing solid load minimized carbon dissolution to the liquid phase and increased the solid and energy yield of the attained hydrochar. According to mill-scale simulations in a 9 m3batch reactor, treating primary sludge alone produced an energy surplus of 22–36 GJ through char incineration, decreasing to 12–22 GJ and 3.4–9.1 GJ for mixed and secondary sludge, respectively. Mixing primary and secondary sludge reduced the overall energy surplus by 2–8% compared with treating the sludge streams separately in two reactors.