采用蒸汽辅助重力泄油技术汽包炉的给水水质研究

为了确定适合采用蒸汽辅助重力泄油技术（SAGD）汽包炉的给水水质要求，利用称重法研究了高温高压条件下给水的硬度的含量对锅炉管内结垢的影响，给水中的油的含量对汽水共腾的影响，以及给水的pH值、O2和CO2含量对锅炉管内腐蚀的影响，并结合现有水质标准进行对比最终确定了给水中铁、铜含量的要求，最终确定了SAGD汽包炉给水水质要求。结果表明：预定SAGD汽包炉的运行压力为10～14 MPa时，给水中溶解氧量、铜含量以及含油量与电站锅炉的指标一致；由于无需纳入汽轮机安全运行的影响，SAGD汽包炉给水中pH值、CO2含量、铁含量以及硬度可以在电站锅炉水质指标的基础上进行适当的放宽。给水中CO2含量无要求，pH值在8.8～10，铁含量≤30 μg/L，硬度≤2 μmol/L，可以满足SAGD汽包炉安全稳定运行的要求。

Experimental study on feed water quality of SAGD steam drum boiler

In order to obtain the requirements in feed water quality in the steam-assisted gravity drainage (SAGD) steam drum boiler under the conditions of high temperature and pressure，using weighting method，this research investigated the influences of hardness on the fouling，the effects of oil contents on steam and water priming，the influences of pH value and the O2 and CO2 contents on the corrosion of the tubes in boiler. The requirements of Fe and Cu in the feed water were also obtained based on the current feed water quality criterion. The operation conditions of the feed water quality requirements were obtained as well. Results demonstrated that when the estimated pressure in the SAGD steam drum boiler was at 10—14 MPa，the contents of dissolved O2，Cu，and the oil in the feed water were consistent with the labeled requirements of the boiler. The value of pH and hardness，contents of CO2 and Fe could be relaxed to a certain extend. The SAGD boiler can operate safely and stably when the pH value is at the range of 8.8－10，the amount of iron ≤30 μg/L，and the hardness ≤2 μmol/L.