输气管道缓蚀剂预膜工艺与模拟研究
发布时间：2019-03-08 17:53
【摘要】：管道内腐蚀不仅会造成重大的经济损失,而且严重威胁着人身安全。常规缓蚀剂加注方法在抑制输气管道内腐蚀的实际应用中存在一定的局限性,从而催生了缓蚀剂预膜技术的发展,即在管道内形成一段稳定的缓蚀剂段塞,在气源的推动下,缓蚀剂沿管线向前运动,在此过程中缓蚀剂分子与管道内壁充分接触,在管道内壁形成一层均匀、致密且附着力较强的具有缓蚀作用的薄膜。目前使用较多的是清管器式预膜技术,对于设有收发球装置的输气管线,此方法操作简单、成本较低,但是目前国内外对此技术没有系统的理论研究,多凭经验操作,缓蚀剂利用效率较低,因此,非常有必要探索缓蚀剂预膜质量的影响因素及操作参数的确定方法。 基于输气管道缓蚀剂预膜工艺理论,提出缓蚀剂清管器预膜工艺,设计相应的实验研究装置,探讨清管器预膜过程,评价影响平均预膜厚度及膜持久性的主要因素；针对传统缓蚀剂沾滴预膜方法的不足,提出改进方案,通过实验模拟评价影响平均预膜厚度及膜持久性的主要因素；建立缓蚀剂清管器预膜模型,分析清管器前后压差及其受力计算公式,确定操作参数的选取。 研究结果表明,缓蚀剂清管器预膜装置可实现对管道内壁预膜,改进的沾滴预膜装置更符合实际情况；缓蚀剂加注量、缓蚀剂溶液黏度、浓度、温度及清管器速度等因素对平均预膜厚度及膜持久性的影响较大,而管径、管内壁粗糙度、管段倾角对预膜质量影响较小；预膜厚度及持久性随缓蚀剂加注量的增加先增大而后趋于稳定；缓蚀剂溶液黏度越大,预膜厚度越厚,膜持久性越强；清管器速度小于1.5m/s时,平均预膜厚度较厚,且膜能保持较长时间；缓蚀剂浓度在300-500mg/L范围内增大时,预膜厚度及膜持久性随之增大,继续增加浓度对预膜厚度影响较小,膜持久性反而呈现减弱的趋势；缓蚀剂温度在10～30℃范围内升高时,平均预膜厚度增厚,持久性增强,但继续升高温度对成膜质量影响较小；管径越大、管内壁粗糙度越大、管段上倾角度越小,缓蚀剂预膜厚度及持久性略微增大,对其影响不明显；清管器受到的剪切力主要是由于缓蚀剂溶液具有黏性引起的,缓蚀剂段塞前后压差及受到的摩擦阻力主要与运行速度、皮碗尺寸、缓蚀剂黏度等因素有关。
[Abstract]:Corrosion in the pipeline will not only cause significant economic losses, but also seriously threaten personal safety. The conventional corrosion inhibitor injection method has some limitations in the practical application of inhibiting the corrosion in the gas pipeline, thus giving birth to the development of the corrosion inhibitor pre-film technology, that is, the formation of a stable corrosion inhibitor slug in the pipeline, driven by the gas source, The corrosion inhibitor moves forward along the pipeline. In this process, the inhibitor molecules are in full contact with the inner wall of the pipeline, and a uniform, dense and strong adhesion film is formed in the inner wall of the pipeline. At present, the pre-membrane technology of pipe cleaner is widely used. For the gas pipeline with ball receiving device, the operation of this method is simple and the cost is low. However, at present, there is no systematic theoretical research on this technology at home and abroad, and the operation is based on experience. The efficiency of corrosion inhibitor is low, so it is necessary to explore the factors affecting the quality of corrosion inhibitor film and the method of determining the operating parameters. Based on the theory of corrosion inhibitor pre-film technology in gas transmission pipeline, the corrosion inhibitor cleaner pre-film process is put forward, the corresponding experimental research equipment is designed, the process of pipe cleaner pre-film preparation is discussed, and the main factors affecting the average pre-film thickness and membrane persistence are evaluated. In view of the deficiency of traditional corrosion inhibitor droplet precoating method, an improved scheme is put forward. The main factors affecting the average prefilm thickness and film persistence are evaluated by experimental simulation. The pre-membrane model of corrosion inhibitor pipe cleaner is established. The pressure difference and the calculation formula of force before and after the pipe cleaner are analyzed, and the selection of operating parameters is determined. The results show that the pre-film device of corrosion inhibitor can be used to pre-film the inner wall of pipeline, and the improved device is more in line with the actual situation. The factors such as the amount of corrosion inhibitor, the viscosity of corrosion inhibitor solution, the concentration of corrosion inhibitor, the temperature and the velocity of pipe cleaner have great influence on the thickness and persistence of the film, but the diameter of the tube, the roughness of the inner wall and the inclination angle of the pipe have little effect on the quality of the film. The thickness and persistence of the pre-film increased first and then stabilized with the increase of the concentration of corrosion inhibitor, and the thicker the inhibitor solution was, the stronger the persistence of the film was, and the thicker the film thickness was, the stronger the persistence of the film was. When the velocity of the tube cleaner is less than that of 1.5m/s, the average thickness of the pre-film is thicker and the film can be maintained for a long time. When the concentration of corrosion inhibitor increases in the range of 300-500mg/L, the thickness and persistence of the pre-film increase with the increase of the corrosion inhibitor concentration, but the persistence of the film decreases when the concentration of the inhibitor continues to increase and the influence of the concentration on the film thickness is small. When the temperature of corrosion inhibitor increases in the range of 10 鈩，
本文编号：2437060
[Abstract]:Corrosion in the pipeline will not only cause significant economic losses, but also seriously threaten personal safety. The conventional corrosion inhibitor injection method has some limitations in the practical application of inhibiting the corrosion in the gas pipeline, thus giving birth to the development of the corrosion inhibitor pre-film technology, that is, the formation of a stable corrosion inhibitor slug in the pipeline, driven by the gas source, The corrosion inhibitor moves forward along the pipeline. In this process, the inhibitor molecules are in full contact with the inner wall of the pipeline, and a uniform, dense and strong adhesion film is formed in the inner wall of the pipeline. At present, the pre-membrane technology of pipe cleaner is widely used. For the gas pipeline with ball receiving device, the operation of this method is simple and the cost is low. However, at present, there is no systematic theoretical research on this technology at home and abroad, and the operation is based on experience. The efficiency of corrosion inhibitor is low, so it is necessary to explore the factors affecting the quality of corrosion inhibitor film and the method of determining the operating parameters. Based on the theory of corrosion inhibitor pre-film technology in gas transmission pipeline, the corrosion inhibitor cleaner pre-film process is put forward, the corresponding experimental research equipment is designed, the process of pipe cleaner pre-film preparation is discussed, and the main factors affecting the average pre-film thickness and membrane persistence are evaluated. In view of the deficiency of traditional corrosion inhibitor droplet precoating method, an improved scheme is put forward. The main factors affecting the average prefilm thickness and film persistence are evaluated by experimental simulation. The pre-membrane model of corrosion inhibitor pipe cleaner is established. The pressure difference and the calculation formula of force before and after the pipe cleaner are analyzed, and the selection of operating parameters is determined. The results show that the pre-film device of corrosion inhibitor can be used to pre-film the inner wall of pipeline, and the improved device is more in line with the actual situation. The factors such as the amount of corrosion inhibitor, the viscosity of corrosion inhibitor solution, the concentration of corrosion inhibitor, the temperature and the velocity of pipe cleaner have great influence on the thickness and persistence of the film, but the diameter of the tube, the roughness of the inner wall and the inclination angle of the pipe have little effect on the quality of the film. The thickness and persistence of the pre-film increased first and then stabilized with the increase of the concentration of corrosion inhibitor, and the thicker the inhibitor solution was, the stronger the persistence of the film was, and the thicker the film thickness was, the stronger the persistence of the film was. When the velocity of the tube cleaner is less than that of 1.5m/s, the average thickness of the pre-film is thicker and the film can be maintained for a long time. When the concentration of corrosion inhibitor increases in the range of 300-500mg/L, the thickness and persistence of the pre-film increase with the increase of the corrosion inhibitor concentration, but the persistence of the film decreases when the concentration of the inhibitor continues to increase and the influence of the concentration on the film thickness is small. When the temperature of corrosion inhibitor increases in the range of 10 鈩，
本文编号：2437060
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