【Ten Years of Rapid Development in Chemical Equipment】From 2011 to 2022, the first domestic-produced ethylene feed pump for DMTO units was successfully developed in China
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The chemical industry has seen tremendous development over the past decade; let’s praise the prosperity and strength of modern China. By contributing our ideas, we can encourage more people to participate and make the discussions more lively. HaiChuan becomes even better with your involvement – we welcome everyone to join in the forum discussions. As July progresses and the weather gets hotter, be careful to prevent fires. Low-carbon olefins (ethylene, propylene) are the foundation of the modern chemical industry, serving as key raw materials for various important synthetic materials such as plastics and fibers. The scale of production of low-carbon olefins is an indicator of the development level of an oil and chemical industry as well as an economy as a whole. With the continuous and rapid development of China’s national economy, the demand for low-carbon olefins is increasing, which in turn leads to a growing demand for DMTO as a production facility for such olefins. As one of the core equipment in DMTO plants, the safe, reliable, and long-term stable operation of the ethylene feed pump is of utmost importance; in the past, reliance on imports meant that there was a high risk of being held back by external factors. With the technological advancement and improvement in manufacturing standards within the domestic pump industry, localization has become inevitable. As a leading domestic manufacturer of petrochemical pumps, Danai Pump Industry has taken the initiative to get involved in the field of technological innovation for domestic production at an early stage. Lanai Pump Industry, thanks to its strong technical foundation and dedication to the pump industry, has built a comprehensive technical portfolio for ethylene feed pumps. When two of the imported pumps in Tianjin Bohua’s 1.8 million tons per year methanol-to-olefins plant failed and had to be shut down one after another, Danai Pump Industry won the trust of the plant owner thanks to its excellent brand reputation and long-standing track record of quality in the industry; the owner contacted Danai right away for assistance. Under the dual pressures of a delivery deadline of just one month and high quality standards, Dainai took the lead and without hesitation made a commitment to complete the task on time and to the required standard! This pump is characterized by low flow rate, high head, and low medium temperature. Being a critical piece of equipment, its safety, reliability, and long-term stable operation are of utmost importance, which imposes high demands on its design, manufacturing, and maintenance. Since imported pumps are used on site, the foundations, cables, and piping connections remain unchanged, which imposes higher and stricter requirements on the technology – accurate measurements on site must be ensured; otherwise, installation at the site will not be possible. This pump is a vertical tubular bag multi-stage pump with 11 stages in total, ranking among those with the highest number of stages. At the same time, due to the structural characteristics of pump designs – which involve a large number of components – higher precision requirements are imposed on each of these components. To create high-quality and even sophisticated products, a thorough technical plan is developed from the initial design stage, and the ANSYS analysis method is used for verification to ensure the stable operation of the pump from a design perspective.
This post was last edited by Desert Fish on 2023-7-8 at 16:58. During the manufacturing process, considerable attention was paid to every aspect of the project, including processes, procurement, machining, assembly, testing, and quality assurance, ensuring that the precision of all components was maintained to high standards. It is worth mentioning that this pump features a single-axis structure with an axis length of 4100 mm. To ensure its stable operation, the design requires that the total runout of the pump shaft be 0.025 mm, which is well below the 0.08 mm specified by the API610 standard. Through strict control at every stage, from raw material selection and heat treatment to machining, the final runout value was achieved at 0.02 mm. This project is of a temporary emergency nature, with a delivery time of only 1 month (the usual delivery time is 6 months, and for imported pumps it’s even 8–12 months), which is quite demanding for the manufacturing department. Thanks to its large-scale operations and solid foundation, as well as advanced management methods – by reusing components from inventory and other projects for the castings, and accelerating the production of other parts – and with the full cooperation of suppliers such as those providing mechanical seals, Dainai was able to complete the delivery within the agreed time frame. This pump is of a retrofit type, and Dainai’s professional technicians provided on-site guidance for its installation and commissioning. By August 4, 2022, the ethylene feed pump had been successfully installed, commissioned, and put into operation at the site; all performance indicators are currently normal (with vibration levels of 0.6 mm/s, which is at an internationally advanced level).