新型自动加氧工艺的控制方法及应用  

Control Method and Application of Novel Automatic Oxygen Injection Technology

作　　者：郭金平[1] 王钊[1] 张小宏[1] 王宁飞[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《中国电力》2017年第10期144-147,180,共5页Electric Power

摘　　要：为保证机组负荷波动时给水溶解氧浓度的恒定,提出了新型自动加氧工艺,也称液态恒值自动加氧技术。该技术利用液体不可压缩的特性,将纯氧气与除盐水在加压后充分融合,通过加氧管线输入到给水系统,彻底避开了氧气本身具有的可压缩特性缺陷,因而可实现氧气以除盐水为载体的刚性投加。该技术已在若干采用加氧工艺的火电机组中实施,实践结果表明,采用液态恒值自动加氧技术后,在给水水量任意变化时,仍能保证省煤器入口溶解氧质量浓度波动范围控制在±3μg/L以内,彻底解决了气态加氧时溶解氧浓度跟随机组负荷反复波动的固有难题,为机组安全连续运行、节能减排提供了有力的技术保证。In order to ensure the constant concentration of dissolved oxygen during unit load fluctuations, a new automatic oxygen injection technology is proposed, i. e. liquid state constant value automatic oxygen injection technique. By taking the advantage of the characteristics of incompressibility of liquids, the technique mixes pure oxygen with salt water sufficiently after they are pressurized and then the mixture is injected into the water supply system through the oxygen injection pipeline. In this way, the defect of the compressibility of oxygen can be avoided such that rigid dosing of oxygen dissolving is implemented in the desahed water. This technique has been implemented in a number of thin, hal power units with oxygen injection. From the results of the practices it is evident that even with random changes of feed water volume, the dissolved oxygen fluctuation will still be maintained within ±3μg/L by using this technique. Therefore, the inherent difficulty of repetitive fluctuation of dissolved oxygen following the unit load change with gaseous oxygen-injection is solved completely. this technology can provide a strong technical support for the continuous operation, energy conservation and emission reduction of the power units.

关 键 词：发电机组 给水加氧 自动加氧 恒值控制 刚性投加 

分 类 号：TM621[电气工程—电力系统及自动化]