非钠类高效锅炉水处理剂的工业应用

The Application of Efficient Non-sodium Water Treatment Chemicals for Boilers

在锅炉水中添加钠系磷酸盐以调节其pH值是炼化企业常用的产汽锅炉防腐手段。但钠系磷酸盐药剂的加入,不可避免地带来大量含磷废水外排,既浪费了能源,增加了污水排放量,又严重影响了装置稳定运行。某炼厂的催化裂化装置产汽锅炉在应用非钠类水处理剂之前,存在氨水挥发造成除盐水热力除氧时pH值偏低和蒸汽携带Na+导致汽轮机结盐积垢的问题。尝试组合使用WPLT-C105和WPLT-H201两种非钠类锅炉水处理剂,以替代单纯使用磷酸钠药剂。为期3个月的应用期内,WPLT-C105和WPLT-H201分别按15～30mg/L和20～25mg/L比例注入到锅炉水中,共消耗药剂约5.75t;炉水和蒸汽品质稳定,锅炉的总排污率从应用前的7%降低到3%;避免了蒸汽携带Na+导致汽轮机结盐积垢问题,有效控制由CO2引起的腐蚀问题和硅夹带现象;创造效益29.95万元,经济效益良好。

Adding sodium phosphate system in the water in boilers to change the pH value is a common method used by refiners to control corrosion for steam production boilers.The addition of sodium phosphate system,however,will inevitably result in the discharge of large amounts of phosphorus-containing wastewater.This method not only discharges large amounts of sewage but will also impair the stability of operation of boilers.The steam production boiler of a catalytic cracking unit in a refinery met with some problems before the introduction of non-sodium water treatment chemicals.Due to the volatilization of aqueous ammonia,the pH of the desalted water was too low during thermal deaeration and the steam turbine suffered from salt deposition due to the presence of Na+ carried by the steam.Researchers tested the use of WPLT-C105 and WPLT-H201 non-sodium water treatment agents,used in combination,to replace sodium phosphate.During the 3-month application period,WPLT-C105 and WPLT-H201 were injected into the water in the boiler in proportions of 15-30mg/L and 20-25mg/L respectively.A total of 5.75 tons of chemicals were used.The quality of the boiler water and steam was stable and the sewage discharge rate of the boiler dropped to 3% from 7%.The use of these agents has prevented salt deposition in steam turbines caused by Na+ carried by steam and effectively controlled corrosion caused by CO2 and silicon entrainment.Economic benefits from the use of these two agents reached 299500 yuan.