【Ten Years of Rapid Development in Chemical Processing Equipment】Heat exchange tube bundles for waste boilers in the Jianlong Chuanbo, Aerospace Changzheng, and Haoyuan chemical projects from 1975 to 2022
Thread Content
This post was last edited by Desert Fish on 2022-12-29 at 10:24. Witnessing the ten-year rapid development of chemical processing equipment, I praise the prosperity and strength of modern China. Wishing everyone a safe and happy New Year! In an effort to stimulate further discussion, we welcome everyone to participate more actively in the forum exchanges. Replies will be rewarded; discussions are encouraged. ------------------------------------------------- On the morning of October 30, 2022, with the sound of horns, the waste heat exchanger tubes from the Jianlong Chuan Guo Aerospace Changzheng Chemical Haoyuan project were transported away, marking the successful completion of the production of these waste heat exchanger products. As a new product for the transformation of waste heat utilization in Jianlong Chuanbo Chemical’s operations, the waste heat boiler is given high priority by the company. At the beginning of production, the various departments of the company drew on the experience gained from manufacturing the first defective furnace, and carried out preliminary planning for the Haoyuan project in advance, establishing quality control requirements as well as relevant countermeasures. Faced with problems in the production process, the relevant departments are also actively seeking solutions.
Given the complex shape of the waste furnace products, and to prevent foreign objects from remaining inside them after assembly, the Process Quality Department developed a quality control ITP plan and established a series of requirements. (1) Inspect for foreign objects in the previous process before starting the current one, and remove any foreign objects from the current process after it is completed.
(2) The branch factory is required to strictly implement this plan during the manufacturing process, assign quality responsibilities to individual persons, and require the responsible persons to provide videos or photos as proof. (3) During the overall product assembly process and after completion, assign specialized inspectors to conduct another inspection of the product’s interior to ensure that all foreign objects have been completely removed. Under strict requirements, the occurrence of foreign objects inside the products has been significantly reduced.
The length of these waste boiler products exceeds 20 meters, and their weight is 50 tons; they require multiple rotations during the manufacturing process for assembly. Following past practice, a louvered plate structure is used to support and secure it. Learning from the previous experience of dents being caused by the comb-shaped plates squeezing the waste boiler tubes, the process department and the technicians at the branch factory discussed the matter and decided to add arc-shaped shims to the support structure. This increased the contact area between the comb-shaped support plates and the tubes, thereby effectively preventing the formation of dents.