Abstract

The paper presents a research on the disposal of the toxic waste of pulp and paper mill (sludge-lignin with the empirical formula CH_1.51N_0.05S_0.03Cl_0.01O_0.54through its oxidation in supercritical water-oxygen fluid, including the case of using methane as a co-fuel. The experiments were carried out with a flow reactor of original design at a pressure of 25 MPa, temperature gradient along the vertical axis (from top to bottom: 390–600°C), and variation in the flow rate of the sludge-lignin (with the addition of NaOH, 1.6 wt %), oxygen, and methane. The experiments yielded data on the content of phenols in the water and the composition of the gaseous products collected at the outlet of the reactor versus the oxygen excess ratio. From these data, as well as the time dependences of the reactor wall temperature and the power of the ohmic heaters, it follows that using distributed supply of methane to compensate for the energy for heating of the reagents is preferable as compared with local inlet of methane to the upper part of the reactor. It has been shown that the addition of methane makes it possible to reduce the oxygen excess required for complete oxidation of the organic components of sludge-lignin.

中文翻译：

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使用甲烷作为辅助燃料在超临界水中焚烧纸浆和造纸厂废物

摘要

本文介绍了纸浆和造纸厂有毒废物（污泥-木质素）的处理研究，经验公式为 CH _1.51 N _0.05 S _0.03 Cl _0.01 O _0.54通过其在超临界水-氧流体中的氧化，包括使用甲烷作为辅助燃料的情况。实验在原始设计的流动反应器中进行，压力为 25 MPa，沿垂直轴的温度梯度（从上到下：390-600°C），以及污泥-木质素流速的变化（添加 NaOH，1.6 wt %)、氧气和甲烷。实验产生了关于水中苯酚含量和在反应器出口处收集的气态产物的组成与氧过量比的数据。根据这些数据，以及反应器壁温和欧姆加热器功率的时间依赖性，因此，与将甲烷局部入口到反应器的上部相比，使用分布的甲烷供应来补偿加热反应物的能量是优选的。已经表明，加入甲烷可以减少污泥-木质素的有机成分完全氧化所需的氧气过量。