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Tianjin Promising Independently Develops 100% Localized Slurry Process Polyethylene Horizontal Scroll Discharge Decanter Centrifuge for Sinopec, and Makes Delivery Successfully
Tianjin Promising Independently Develops 100% Localized Slurry‑Process Polyethylene Horizontal Scroll Discharge Decanter Centrifuge and Completes Successful Delivery For a major domestic petrochemical pilot project on new‑generation slurry‑process polyethylene technology, Tianjin Promising supplied a fully‑localized horizontal scroll discharge decanter centrifuge.
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Tianjin Promising Independently Develops 100% Localized Slurry Process Polyethylene Horizontal Scroll Discharge Decanter Centrifuge for Sinopec, and Makes Delivery Successfully
Tianjin Promising Independently Develops 100% Localized Slurry‑Process Polyethylene Horizontal Scroll Discharge Decanter Centrifuge and Completes Successful Delivery
For a major domestic petrochemical pilot project on new‑generation slurry‑process polyethylene technology, Tianjin Promising supplied a fully‑localized horizontal scroll discharge decanter centrifuge.
Domestic petrochemical polyethylene production separation processes have long widely adopted imported decanter centrifuges. Tianjin Promising, a Chinese private‑owned enterprise, commenced R&D and manufacturing of centrifuges and differential assemblies back in 2004. Over the past two decades, the company has focused on the independent development and production of decanter centrifuges and differential units, and has realized full localization and field application for multiple types of centrifuge and differential assemblies originally relying on imports.
Centrifuges manufactured by Tianjin Promising for separating special‑process materials including dimethyl terephthalate, melamine, polyphenylene sulfide and sodium hydrogen sulfate are available as complete sets. Their performance is comparable to imported equivalent equipment, offering domestic alternative options for end‑users.
Tianjin Promising has accumulated rich engineering experience in the localization, retrofitting and refurbishment of centrifuge assemblies compatible with Andritz‑type equipment, covering complete machines, rotor components, differential units, spare‑part replacement and overhaul services. Multiple sets of locally‑manufactured differential assemblies, rotor parts and retrofitted centrifuge units have been put into stable long‑term operation at domestic petrochemical sites, with field‑proven reliable performance recognized by customers.
Drawing on its proven practical engineering background, Tianjin Promising was selected as the supplier of horizontal scroll discharge decanter centrifuge for this key domestic petrochemical pilot project. Following in‑depth rigorous technical exchanges between both parties, a technical agreement was executed in July 2023.
Key Technical Features
Dual‑Frequency Dual‑Speed Configuration
This configuration enables adjustable main drive speed and differential speed within specified ranges. Different separation factors and discharge speeds can be achieved to reach optimized separation performance.
Fully-Sealed Construction
Considering process material properties, double dry‑gas seals are fitted at the feed pipe and both‑end shaft seals of the casing. The nitrogen‑based dry‑gas seal control system isolates internal process media from the external environment. Mechanical seals are further installed on both ends of the scroll to realize zero‑emission operation.
Lubrication System
The centrifuge main bearings adopt an advanced circulating lubrication‑and‑cooling solution. The lubrication system is equipped with dual motors, dual oil pumps, dual cartridge filters and dual coolers. In case of unexpected operating conditions, the system can instantly switch to the backup oil circuit. It implements dual‑lubrication arrangements sharing one oil tank to guarantee stable and reliable equipment operation.
Material Specification
To secure sufficient strength and rigidity for the bowl and scroll, the drum, scroll hub, large‑end support and small‑end support are manufactured from centrifugal‑cast duplex stainless steel. Duplex stainless steel delivers outstanding corrosion resistance and mechanical properties. Centrifugal casting effectively minimizes casting defects such as porosity and slag inclusions for high material density, safeguarding mechanical performance of critical components.
High‑Grade Surface Finishing
Mirror‑finish single‑sided plates and Taigang steel plates polished to Ra0.8 are adopted for casing, flanges, partitions and reinforcing ribs to satisfy ultra‑high surface smoothness requirements. The inner surfaces of drum and casing reach Ra0.4 surface roughness.
Common Base Frame
The centrifuge main unit, driving motors and oil‑lubrication cooling system are integrated onto one shared base frame, facilitating integral hoisting and site transportation.
The independently‑developed fully‑localized slurry‑process polyethylene decanter centrifuge brings practical value for domestic petrochemical process equipment. The domestically‑built unit can deliver equivalent performance against imported counterparts, while helping customers achieve substantial capital‑cost savings. It provides a viable domestic alternative solution to reduce reliance on imported large‑size horizontal decanter centrifuges within China’s petrochemical sector.
This key petrochemical pilot project validates Tianjin Promising’s technical competence among domestic equipment manufacturers. The project serves as comprehensive practical verification of the company’s R&D and manufacturing capabilities accumulated over more than 20‑year operation. Tianjin Promising is now technically capable of undertaking high‑standard large‑scale critical‑process projects. The company will keep improving its technical expertise, pursue product excellence, and strive to grow into a high‑calibre, responsible domestic manufacturing enterprise.
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