【Ten Years of Rapid Development in Chemical Equipment】The first domestic-produced ethylene feed pump for DMTO units was developed in the period 2017–2023
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The chemical processing industry has seen significant development over the past decade; it’s a testament to the prosperity and strength of modern China. I wish everyone a happy New Year, and may your families be safe and healthy. By contributing our ideas, we can create a more lively discussion environment. With you all, Haichuan becomes even better – I encourage everyone to participate more actively in the forum discussions. In September 2022, news came from Dainai Pump Co., Ltd.: the first set of ethylene feed pumps for domestic methanol-to-olefins (DMTO) plants, designed and developed by this company, was successfully installed, tested, and put into operation on August 4th. To date, all performance indicators are normal, with the vibration speed at 0.6 mm/s, which is at an internationally advanced level. This marks the localization of the first ethylene feed pump for domestic DMTO units.
Low-carbon olefins (ethylene, propylene) are the cornerstone of the modern chemical industry; they serve as the basic 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 the petrochemical industry and 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.
This pump is characterized by low flow rate, high head, and low medium temperature. Being a critical piece of equipment, safety, reliability, and long-term stable operation are of particular importance, which imposes high demands on the design, manufacturing, and maintenance of such pumps. Since imported pumps are used on site, the foundations, cables, and various connections remain unchanged, which imposes higher and stricter requirements on the technical aspects – accurate measurements at the site must be ensured; otherwise, installation there 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 placed on each of these components. To create high-quality and even sophisticated products, a thorough technical plan was developed from the initial design stage, and the ANSYS analysis method was employed for verification to ensure the stable operation of the pump through proper design.
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 is 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 specializing in mechanical seals, Dainai was able to complete the delivery within the agreed time frame.
【Ten Years of Rapid Development in Chemical Processing Equipment】Shenyang-made low-temperature ethylene pumps for Zhongyuan Petrochemical, 1982–2017 https://bbs.hcbbs.com/thread-3590810-1-1.html (Source: Haichuan Network – Chemical Industry Forum)