高浓度偏二甲肼废液近临界水氧化处理试验研究

Study on propellant unsymmetrical-dimethyldrazine waste liquid treatment by near-critical water oxidation technology

开展了高浓度偏二甲肼废液的近临界水氧化处理试验研究,介绍了近临界水氧化的基本概念及其处理偏二甲肼废液的原理,设计加工了试验装置,进行了连续流模拟试验,确定了处理偏二甲肼废液的近临界工艺参数为:T=550～570℃,P=20MPa,氧气投加比为1.3∶1～1.5∶1,反应器停留时间t=70s。当原液COD≤82 800mg/L时,处理后排放液体的各项指标能满足推进剂废水排放要求,碳元素主要转化为CO_2,氮元素主要转化为N_2,实现了高浓度偏二甲肼废液的无害化和无机化。低于临界压力的近临界工艺条件可以减小反应器壁厚、降低设备投资和运行成本,为工程应用奠定了基础。

Near-critical water oxidation of high concentration unsymmetrical dimethylhydrazine (UDMH) waste liquid was studied. The near-critical water oxidation basic concepts and principles are introduced. The experimental device was designed. The process parameters are determined by the experiment=T = 55O.570℃, P = 20MPa, oxygen ratio = 1.3~1.5:1, reactor residence time Z=70s. When the raw liquid CODW82 800 mg/L, environmental pollution indexes of effluents achieves the correlative country standard. Carbon elements are mainly converted into CO2, nitrogen elements are mainly converted into N2. This process can make high concentration UDMH waste liquid harmless and inorganic. Below the critical pressure can make the reactor wall thickness, reduce the equipment investment and operation cost. This study establish the foundation for near-critical water oxidation engineering applications.