Chinese Petroleum Corporation Selects DuPont Clean Technologies For Taoyuan Refinery

July 24, 2017
CPC Taoyuan starts up sulfur recovery units with MECS DynaWave Scrubbing System.

The Chinese Petroleum Corporation (CPC) awards DuPont Clean Technologies (DuPont) the contract to supply the technology license, engineering and proprietary equipment for a MECS DynaWave wet gas scrubbing unit at its Taoyuan refinery in Taiwan in August 2017. This scrubbing system recently went into operation for two sulfur recovery units (SRUs) at the site, in time for CPC to comply with strict emissions reduction regulations, according to DuPont.

In the past, seven to eight days were required after turnaround of the SRUs at the CPC refinery before acid gas could be fed to the units and commence normal operation. As a result, off-gas from the catalyst would be released directly to the stack and into the air, causing environmental issues. CPC researched different solutions to resolve these issues, and reportedly opted for the MECS® DynaWave scrubber, a scrubbing technology licensed by DuPont.

“CPC chose the DynaWave scrubber for the high reliability of its outlet gas emissions when inlet gas SO2 concentration varies,” says William Lam, senior business development manager, Taiwan and Japan. “This means there is no need to adjust DynaWave equipment such as valves or pumps in order to meet strict emissions targets. The SO2 removal efficiency of DynaWave turns an average of 10,000 ppmv SO2 at the inlet into a guaranteed outlet of less than 50 ppmv SO2.” At startup, CPC technical teams reportedly measured only 10 ppmv SO2 at the stack outlet.

“Two 2-stage Claus units in the SRU2 and SRU3 at the Taoyuan refinery will be treated in a single DynaWave scrubber,” says Lam. The SRUs have a capacity of 100 tons/day (SRU2) and 200 tons/day (SRU3), respectively, according to DuPont.

Licensed by DuPont, MECS DynaWave scrubbers are designed to work with a variety of reagents and handle multiple functions in one vessel. As such, the process makes it possible to quench the incinerated gas and remove potential particulates while absorbing the remaining acids from the Claus TGTUs, according to the company. The technology reportedly bypasses the SRU or the SRU tail gas system during maintenance and repairs, so operations can continue without interruption.

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