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Scaling on the sulfuric acid side is difficult to deal with because chemical agents cannot be added. Below is 1 preheater, with concentrated sulfuric acid on one side at a concentration as high as 99.5%, and demineralized water on the other side. https://p3-sign.toutiaoimg.com/tos-cn-i-axegupay5k/cf1ad2e275e541d582e44d8c5d18c6a4~noop.image?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1727490786&x-signature=icW00KmGl83Grsg4KxCqNfPBSyE%3D The inlet temperature of concentrated sulfuric acid is around 164.5°C, while the outlet temperature is around 105°C. Concentrated sulfuric acid has a characteristic: once the temperature drops at high temperatures, crystals will precipitate and cause scaling. To prevent scaling in concentrated sulfuric acid, microwave anti-scaling and descaling equipment was installed in the preheater on August 15, as shown in the image below: https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/e71c2e3182e54fb18abe17c681e6a802~noop.image?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1727490786&x-signature=av4wWyE%2FXlsluZZEPn2xIGMeXjk%3D By the time the equipment was installed, 2/3 of the preheater was already blocked. One month has passed, and data analysis shows that scaling has not continued to worsen during this period; in fact, it has started to improve, with signs of an increase in the heat exchange efficiency of the preheater. As shown in the following image: https://p9-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/273e634425f84ae59dae0ff2aaee1d69~noop.image?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1727490786&x-signature=B74onkXWW5vxuqinxbdAhWhTv2M= It was installed on August 15. On September 13, the preheater was opened for cleaning. In the past, each cleaning process took 5–6 hours; however, this time it was quite easy. Many of the heat exchange tubes inside the preheater were clean, and the scale buildup was loose, so a simple cleaning sufficed. As a result, it only took one and a half hours. Not only that, but the old scale inside the acid inlet pipe also began to come off. As shown in the image below: https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/f7ff575c3424439b8e9b0cfe4e22f2fd~noop.image?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1727490786&x-signature=%2F6VD9Hjd18H5f3pPsG0MoituipQ%3D For those who wish to learn more, please add WeChat: TigerPeng2014 or scan the QR code: https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/42df96329c6245e980f36c61c4a35a31~noop.image?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1727490786&x-signature=Bb50v3qj9iVUneNnJiI2eC8b%2B8U%3D