9月15日一早，大庆石化炼油一部设备工程师薛睿盯着140万吨/年催化裂化装置余热锅炉操作画面上的一组数据，面露喜色。完成干冰清灰的2台余热锅炉已稳定运行157天，排烟温度持续保持低位，蒸汽外输量高位运行。

On the early morning of September 15th, Xue Rui, an equipment engineer from the First Refining Department of Daqing Petrochemical, stared at a set of data on the operation screen of the 140 million-ton/year catalytic cracking unit's waste heat boiler, showing a look of joy. The two waste heat boilers that completed the dry ice cleaning operation have been running stably for 157 days. The exhaust gas temperature has remained at a low level, and the steam output has been operating at a high level.

这2台“服役”20多年的余热锅炉承担着催化裂化装置及周边装置余热回收、产汽保供的重任。可运行日久，催化剂粉尘持续沉积附着在各管段管束，形成顽固积灰、结成硬垢，使锅炉换热效率大打折扣，不仅造成装置能耗上升、产汽量下降，也制约着装置的高效运行。

These two "in-service" boilers that have been in operation for over 20 years are responsible for recovering the waste heat from the catalytic cracking unit and the surrounding facilities and providing steam supply. However, due to long-term operation, catalyst dust continuously accumulates and adheres to each pipe section and tube bundle, forming stubborn deposits and hard scale, which significantly reduces the boiler's heat exchange efficiency. This not only leads to an increase in the unit's energy consumption and a decrease in steam production, but also restricts the efficient operation of the unit.

此前，岗位员工通过扩容受热面、升级吹灰器设备进行常态化吹灰冲灰，还利用装置检修窗口期同步实施高压水力清灰。但随着催化剂积垢附着严重，盲肠死角难以彻底清理，传统清灰方式渐渐陷入被动，难以适配高效生产需求。

Previously, the on-site staff carried out regular soot blowing and ash removal by expanding the heat exchanger area and upgrading the soot blowing equipment. They also implemented high-pressure water cleaning during the maintenance window periods of the equipment. However, as the catalyst deposits became extremely thick and the blind corners were difficult to clean thoroughly, the traditional cleaning methods gradually became ineffective and unable to meet the requirements of efficient production.

立足绿色低碳发展理念，大庆石化聚焦装置长周期高效运行目标，鼓励一线技术人员扎根岗位、攻坚创效。这让薛睿彻底打破了传统思维的局限：与其守着旧方法“凑合用”，不如主动探索更适配装置工况的新方案，彻底破解积灰难题。

Based on the green and low-carbon development concept, Daqing Petrochemical focused on the goal of long-term and efficient operation of the equipment, and encouraged front-line technicians to stay at their posts and strive to achieve efficiency gains. This completely broke through the limitations of traditional thinking for Xue Rui: Instead of sticking to old methods and "making do", it was better to actively explore new solutions that were more suitable for the equipment conditions, and completely solve the problem of dust accumulation.

为此，薛睿牵头技术小组查阅大量文献资料，结合余热锅炉特性和积垢情况，比对各类清洗工艺，反复论证后，最终锁定干冰清洗技术，又与专业清洗厂家反复沟通工艺细节。

To achieve this, Xue Rui led the technical team to review a large amount of literature, combined with the characteristics of the waste heat boiler and the accumulation of scale, compared various cleaning methods, and after repeated discussions and arguments, finally selected the dry ice cleaning technology. Then, he also communicated with professional cleaning manufacturers to further clarify the technical details.

今年3月，新方案正式落地。操作人员使用专业设备将干冰颗粒喷射至锅炉内部关键受热面，利用干冰快速升华后的低温脆化和微爆破效应，将顽固的积灰从管壁上“撬”下来，三五天的工夫就完成了全部清洗。

In March this year, the new plan was officially implemented. Operators used specialized equipment to spray dry ice particles into the key heating surfaces inside the boiler. By taking advantage of the extremely low temperature produced by the rapid sublimation of dry ice and its micro-explosion effect, they were able to off the stubborn accumulated ash from the pipe walls. The entire cleaning process was completed within three to five days.

“清洗效果十分明显，2台余热锅炉实测排烟温度大幅下降。相近工况下，3.6兆帕蒸汽产量提高超2吨/小时，半年累计增效200余万元。”薛睿介绍。目前，干冰清洗技术已推广应用于炼油一部装置区的空冷器、设备油污等清洗作业，技术应用场景持续拓展。

The cleaning effect was very obvious. The measured flue gas temperature of the two waste heat boilers decreased significantly. Under similar conditions, the steam output of 3.6 megapascals increased by more than 2 tons per hour, and the cumulative efficiency increase over half a year reached over 2 million yuan. Xue Rui explained. Currently, the dry ice cleaning technology has been widely applied to the cleaning operations of air coolers and equipment oil stains in the unit area of the refining department one, and the application scenarios of the technology are continuously expanding.

相较于传统清洗工艺，干冰清洗技术除垢，无废水废液，无介质残留，不伤设备本体，实现绿色高效清灰作业。

Compared with traditional cleaning methods, the dry ice cleaning technology for removing scale does not produce wastewater or waste liquid, does not leave any medium residue, and does not damage the equipment itself. It enables a green and efficient cleaning operation.

不费“吹灰之力”，巧解积灰顽疾。薛睿和一线技术团队敢想敢试，以新型清洗工艺打通设备节能堵点，为企业绿色转型、降本增效蹚出了实操新路。

With ease, they successfully resolved the stubborn problem of accumulated dust. Xue Rui and the frontline technical team were bold in their thinking and willing to try. They used a new cleaning process to break through the bottlenecks hindering energy conservation in the equipment, thus pioneering a practical new path for the company's green transformation and cost reduction and efficiency improvement.