CB&I’s proprietary ethylene steam cracking process is the most widely-applied process for the production of polymer grade ethylene, polymer grade propylene and butadiene. The process is noted for its performance, including high product yield and energy-efficiency, low investment cost and operating reliability. Plant owners have selected this technology for more than 200 projects, accounting for over 40% of worldwide ethylene capacity. CB&I’s worldwide experience encompasses plants designed for ethylene capacity up to 1,450,000 MTA and feedstocks from ethane through gasoils.
The family of high capacity SRT® pyrolysis furnace modules are designed for short residence time and low pressure drop, which maximizes olefins yield. Three SRT furnace designs are offered, allowing for the site-specific optimization of investment cost, yield and run length. The latest-generation SRT VII provides the highest yield for all feedstocks and results in an easy-to-operate and robust mechanical design. The patented, close-coupled, single-stage Quick Quencher transfer line exchanger (TLE) offers significant operating and cost advantages over competing designs. A unique firebox design called the SRT X allows for single heater capacities in excess of 300 kta of ethylene and can be utilized in new designs or expansion projects where plot space is limited.
The new, energy-efficient olefins recovery system is a step out from conventional technology. It minimizes capital investment by reducing the number of compressor casings by 40% and eliminating up to 25% of the equipment pieces used in a conventional system. Its key features are a low pressure chilling train that operates at less than half the operating pressure of a conventional flow scheme, and the tertiary refrigeration system that produces refrigeration from 40°C to -140°C in a single refrigeration system instead of the three systems used in a conventional design. The lower piece count also reduces maintenance costs and improves reliability.
All plants meet designed capacity and exceed guaranteed performance. Average on-stream time is well above the industry average at nearly 99%. Time between turnaround averages five years with some plants achieving eight to 10 years.