Xintian Coal Chemical: The replacement of the 53-meter tower top tube bundle was completed successfully

Thread Content

Xintian Coal Chemical: Successful replacement of the heat exchanger tube bundle at the top of the tower Author/Source: Zhejiang Energy Xintian Coal Chemical Date: 2021-06-09 Views: 170 On June 5, after 60 hours of hard work, the purification workshop at Xintian Coal Chemical completed the replacement of the heat exchanger tube bundle at the top of the methanol, water, and hydrocyanic acid separation tower. The tube bundle of the methanol, water, and hydrocyanic acid separation tower in the company’s purification workshop is made of carbon steel, which poses a risk of corrosion and leakage during operation. To ensure the long-term safe and stable operation of the plant’s systems, the company’s purification workshop took advantage of the major maintenance period to decide to replace the heat exchanger tube bundles in the methanol, water, and hydrocyanic acid separation tower with stainless steel tube bundles. The tube bundle to be replaced in the methanol-water heat exchanger of Xintian Coal Chemical’s purification workshop weighs 12 tons, and its replacement and installation must be carried out at the top of a tower that is 53 meters high. This installation task requires a 650-ton crane to assist in lifting and replacing the tube bundles; for this reason, the staff from Xintian Coal Chemical’s purification workshop worked together with the maintenance team to carry out all the preparatory tasks prior to the replacement. The process engineers in the company’s purification workshop worked overtime to carry out all the preparatory tasks prior to the replacement, including isolating the tower, draining it, replacing its contents, and steaming the tower ； To meet the requirements for special hot work in confined spaces within the tower, with the cooperation of process engineers, ten rolls of fire hoses were connected together to form a long hose line, which was used to inject water from the top of the tower for cleaning purposes. This enabled the methanol-water-hydrogen cyanide separation tower to be made ready for maintenance and delivered to the maintenance crew in a timely manner. The company’s maintenance crew worked overtime to weld the heat exchanger support beams at the top of the separation tower; after 5 hours of continuous work, the heat exchanger tube bundles in the separation tower were ready for lifting and replacement.