【Major Equipment in the Chemical Equipment Industry】405 – The First Large-Flow Butadiene Screw Compressor Unit with Liquid Film Sealing

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It’s tough in the scorching summer heat! Keep up with heat prevention and cooling! Clarify the key tasks! Safety analysis must not be neglected! ----------------------------------------------The past decade has been a period of rapid development in China’s chemical industry, with the emergence of many new processes, products, and equipment. China’s chemical processing equipment has also seen significant progress, which has contributed to the swift advancement of the petrochemical sector. Here, we have compiled some of the achievements and breakthroughs made by Chinese equipment manufacturers in terms of larger-scale production and greater use of domestic equipment. We invite everyone to share their insights and engage in discussions; let’s cheer for Made in China and support the development of chemical processing equipment! ------------------------------------------------------ In August 2021, the liquid film seal for screw compressors used in butadiene processing units with a shaft diameter of 250 mm, developed by Dongying Haisen Sealing Technology Co., Ltd., was successfully applied to the first high-flow butadiene screw compressor unit manufactured by the 711th Research Institute of China State Shipbuilding Corporation. It was also put into operation at Zhejiang Petrochemical Co., Ltd., marking an improvement in the level of compressor liquid film sealing technology offered by our company, as well as a further enhancement of the market competitiveness of Haisen Sealing’s related technologies and products in this industry. The working principle of the liquid film seal relies on the fluid dynamic pressure grooves provided on the end faces; under rotational conditions, the viscous shear force causes the sealing medium to leak from the high-pressure side to the low-pressure side and then be transported back to the high-pressure side. This increases the pressure of the liquid film and keeps the two sealing end faces apart, thereby preventing leakage of the sealing medium from the high-pressure side to the low-pressure side. As a result, zero leakage of the liquid phase or gas phase is achieved (referred to collectively as leak-free operation), offering safety, reliability, energy efficiency, and environmental protection. This set of units was put into operation as scheduled, marking the first time that large-diameter screw compressors along with the corresponding seals were manufactured domestically. This achievement laid a solid foundation for replacing imported units and seals in similar domestic installations in the future. It also contributed to advancing technological progress in the industry and accelerating the localization of high-end compressors and related seals, through the efforts of Haisen.