What is the operational status of centrifugal propylene compressors in China, and what is the situation regarding manufacturers of such compressors?

In terms of the domestic capacity to manufacture centrifugal compressors, SHENGU has a strong capability. This factory also has experience in manufacturing propylene compressors. -Cooling capacity of 40°C class can be provided.

Citing the reply from forum member liangge555, thank you, liangge555. Our factory also uses the propylene refrigeration low-temperature methanol washing process; the compressors are supplied by Shenyang Blower Factory, while the associated steam turbines come from Hangzhou Turbine Factory. Overall, things have been satisfactory since the commissioning began. The first issues that arose were related to the instruments (imprecise level gauges and insufficient sensitivity of the automatic control valves). Later on, there were problems related to gasification in the upper processing stage and the impact of changes in the purification process on the refrigeration section. It’s relatively easy to get the propylene compressors running stably; as long as the instruments and equipment are properly maintained, and coordination with the purification process is ensured, it works fine. Since propylene operates in a closed-loop system, the purification process functions as an open supply source, and its stability depends to a large extent on the stability of the purification process itself. Before this, no one in our factory had experience working with steam turbines coupled to centrifugal compressors; everyone was still figuring things out out. It takes time for the system to reach stable operation from the stage of commissioning.

I have learned some information through phone calls and the Internet, and I would like to share it here: At present, large-scale propylene compressors in China are all imported, such as those from Mitsubishi, GE, Elliot, Hitachi, and so on. Currently, the propylene compressor used in Zhenhai’s 1 million-ton ethylene plant is a product of SHENGU; it is the first of its kind at such a large scale in China. + m3 g0 e% ]8 H0 Y* _$ t The products from those manufacturers that were imported in the past have never caused any problems. For 8000-9000, if purchasing domestically, there is no other option besides Shengyu. The recommended imported brands are GE and Elliot. Siemens’ products are too expensive. Online information: Development of propylene compressors for ethylene plants with an annual production capacity of 480,000 tons. Contact party: Shenyang Blower Factory. Address: No. 36, Yunfeng North Street, Tiexi District, Shenyang. Postal code: 110022. Contact person: Zhao Yuqin. Phone number: 024-25801291. This project is part of a key science and technology initiative; it was designed and manufactured in collaboration with foreign manufacturers. The compressor features a horizontally split welded casing, with compression taking place in four stages and seven stages in total; the gas reaches the final outlet pressure after going through these four stages of compression. The compressor and turbine shafts are connected using imported diaphragm couplings; the compressor and turbine are placed on their respective steel chassis, with the two chassis being connected together by bolts. In addition to supplying oil to its own propylene unit, the lubrication system of this unit also provides lubricating oil and control oil for the ethylene compressor, and it fully complies with the American Petroleum Institute API614 standard. Its automatic control utilizes the world’s most advanced ITCC control system. The successful development of this project demonstrates that our country possesses the capability to design and manufacture centrifugal compressors for large-scale ethylene plants, and these products fill a gap in the domestic market. As proven by on-site operation evaluations, the main technical performance indicators of this machine have reached the international advanced level.

On March 16, the three sets of compression units developed by SHENGU Group for the ethylene production plants with an annual capacity of one million tons each at three domestic petrochemical enterprises were put into operation simultaneously. Once these units are successfully developed, they will break the international monopoly and fill the gap in China’s market for large-scale compression units used in such ethylene plants. SHENGU Group will thus become one of the few companies in the world capable of producing such large compression units, joining internationally renowned firms such as GE from the United States and Siemens from Germany. Experts such as Sui Yongbin from the China National Machinery Industry Federation pointed out that projects with an annual ethylene production capacity of one million tons are major undertakings, and the cracking gas compressors, propylene refrigeration compressors, and ethylene compressors – commonly referred to as the “three ethylene compressors” – are the most critical components in such plants, and also the ones most difficult to produce domestically. Shenmu Group’s initiation of the development of the \"ethylene tri-machine\" is a milestone-worthy major event. It is said that ethylene is the cornerstone of the petrochemical industry; its production capacity and quality reflect the level of development of this industry, and it also has a strong driving effect on downstream industries. According to relevant calculations, once a production facility with an annual output of one million tons of ethylene comes online, it can stimulate industrial investment in downstream sectors worth over 100 billion yuan. As a result, ethylene receives significant attention. The \"three key machines for ethylene production\" are located at the starting point of ethylene manufacturing and constitute the core equipment in such facilities; their production technology has for a long time been monopolized by a few major companies around the world. To develop ethylene, the \"three key technologies for ethylene\" become a threshold that must be overcome. Over the past decade or so, based on the process of introducing, digesting, and absorbing foreign technologies, SHENGU Group has developed its own compressors for ethylene production facilities with annual capacities of 240,000 tons, 360,000 tons, and 640,000 tons. It has achieved hundreds of milestones in China as the developer of \"first\" or \"unique\" systems of this kind. The three compressors that are now put into operation include a pyrolysis gas compressor developed for Sinopec’s Tianjin Petrochemical Branch, as well as propylene refrigeration compressors developed for Sinopec’s Zhenhai Refining and Chemicaling Branch. It is reported that the first prototype will be developed by the end of this year.