【Ten Years of Rapid Development in Chemical Equipment】The First Ethylene Feed Pump for Domestic Methanol-to-Olefins (DMTO) Plants from 2002 to 2022

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Witness the ten-year rapid development of chemical processing equipment; praise the prosperity and strength of modern China. Replies will be rewarded – discussions are welcome. ------------------------------------------- News 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 4. 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, there is an increasing demand for low-carbon olefins, which in turn leads to a growing demand for DMTO as a facility for producing such olefins. As one of the core devices in the DMTO unit, the safe, reliable, and long-term stable operation of the ethylene feed pump is of utmost importance. In the past, our country has relied on imports for this product for a long time. As the technology and manufacturing standards of the domestic pump industry improve, localization has become inevitable. 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 taken out of service one after another, Dainai Pump Industry rushed to produce the replacement pumps despite the pressure of a one-month delivery deadline. With the full cooperation of suppliers such as those providing mechanical seals, the pumps were delivered within the agreed time frame. It is reported that this pump features low flow rate, high head, and low medium temperature under operation. As a key equipment in the DMTO plant, this pump requires high standards in terms of design, manufacturing, and maintenance. During the production process, Dainai Pump Industry pays close attention to every aspect of this project – including manufacturing processes, procurement, machining, assembly, testing, and quality assurance – to ensure the precision of the components. The pump features a single-axis design with an axis length of 4100 millimeters. To ensure its stable operation, the design requires that the total runout of the pump shaft be 0.025 millimeters, which is well below the 0.08 millimeters specified by the API610 standard. By exercising strict control over every stage, from raw materials and heat treatment to machining, Dalian Pump Industry manages to achieve a runout value of 0.02 millimeters. It is understood that this pump is a vertical tubular bag multi-stage pump with a total of 11 stages, ranking among those with the highest number of stages. At the same time, the pump has a special structure, numerous components, and high precision requirements for each component. To produce high-quality products, Danai Pumping has developed comprehensive technical solutions from the initial design stage, and also uses ANSYS analysis methods for verification, thereby ensuring the stable operation of the pumps through proper design.