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SOx/NOx co-removal during compression of oxy-fuel flue gas

机译：压缩氧气燃料烟道气中的SOx / NOx共去除

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The co-removal of SO_x, and NO_x during CO_2 compression is an option in oxyfuel CO_2 compression based on an Air Products patent on sour gas cleaning. This would potentially reduce the capital and operating cost of oxyfuel CCS by avoiding the common inclusion of a SO_2 scrubbing unit operation prior to compression. In order to clarify three critical aspects of the possibility of co-removal, controlled laboratory experiments on a small pressure vessel and bench scale compression unit were conducted to improve our understanding regarding; a. The extent of the reactions of SOX and NOX associated with their absorption when in contact with water vapour known and liquid water in CO_2 compression and also with representative liquids representing the condensates, being water, HNO_3(1) and H2SO4 (1); b. The conditions and liquids where N_2O is formed, this being known as a strong greenhouse gas; Experiments were conducted in a small pressure vessel at conditions representative of typical gas compression from oxy-fuel combustion without SO_2 removal involving the gases SO_2, NO (at lOOOppm inlet levels) and O2 (at 5% v/v inlet), with water vapour, liquid water, nitric and sulphuric acids at pressures of 5 and 25 bar. The results indicate that in the standard oxy-fuel CO: compression system - with several stages of compression at increasing pressures - in the initial low pressure stages, soluble SO_2 will be readily removed; and the partial oxidation of insoluble NO to soluble NO_2 will occur in higher pressures stages. At 25 bar, complete removal of SO_x and 90% removal of NOX (as NO_2) was achieved. The N_2O measurements reported appear to be the first experimental confirmation of N_2O formation with simultaneous SO_2 and NO_x removal at pressure. These have indicated that N_2O formation requires gas/liquid contact (ie two phase) and simultaneous capture of NO_x and SO_2. Partial but substantial release of the absorbed SO_2 and NO from the liquids after depressurisation was measured. Some desorption of N_2O was also measured. The results indicated that N_2O formation was a maximum of 30ppm concentration which was equivalent to <1% CO_2 for GHG impact. The N_2O formation was found to be related to SO_2 capture with -4-6% of SO_2 feed utilised to form N_2O. Interactive effects between SO_x and NO_x were measured but found to be relatively insignificant. Overall, the compression of oxy-fuel flue gases containing acid gases, may prove to be a cost effective alternative for impurity control. The control of released gases on depressurisation and formation of N_2O must be evaluated as part of the CPU design.
机译：根据空气产品公司关于酸性气体清洁的专利，在CO_2压缩过程中同时去除SO_x和NO_x是含氧燃料CO_2压缩的一种选择。通过避免在压缩之前共同包含SO_2洗涤装置操作，这将有可能减少含氧燃料CCS的投资和运营成本。为了阐明共清除的三个关键方面，在小型压力容器和台式压缩装置上进行了受控的实验室实验，以提高我们的理解;一种。当与已知的水蒸气和处于CO_2压缩状态的液态水以及代表冷凝物的代表性液体为水，HNO_3（1）和H2SO4（1）接触时，SOX和NOX的反应程度与其吸收有关。 b。形成N_2O的条件和液体，称为强温室气体;实验是在一个小型压力容器中进行的，条件是典型的含氧燃料燃烧过程中产生的典型气体压缩而没有去除SO_2，涉及的是带有水蒸气的SO_2，NO（入口浓度为1000ppm）和O2（入口量为5％v / v）。 ，液态水，硝酸和硫酸，压力分别为5和25 bar。结果表明，在标准的含氧燃料CO：压缩系统中-在逐渐增加的压力下进行几个压缩阶段-在初始低压阶段中，可溶性SO_2会很容易地被除去。在较高的压力阶段会发生不溶性NO部分氧化为可溶性NO_2的现象。在25 bar的压力下，可以完全去除SO_x和90％去除NOx（作为NO_2）。报道的N_2O测量值似乎是在压力下同时去除SO_2和NO_x的N_2O形成的第一个实验确认。这些表明，N_2O的形成需要气/液接触（即两相）并同时捕获NO_x和SO_2。减压后，测量了从液体中吸收的SO_2和NO的部分但基本释放。还测量了N_2O的一些解吸。结果表明，N_2O的形成最大浓度为30ppm，这相当于温室气体影响的<1％CO_2。发现N_2O的形成与SO_2的捕获有关，其中-4-6％的SO_2进料用于形成N_2O。测量了SO_x和NO_x之间的交互作用，但发现该影响相对较小。总体而言，压缩含酸性气体的含氧燃料烟道气可能被证明是控制杂质的一种经济有效的选择。在CPU设计中必须评估在减压和N_2O形成时释放气体的控制。

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