SIEMENS Energy will build four identical carbon dioxide compressor trains for a coal liquefaction plant to be built by China’s Shenhua Ningmei Coal Group in the Ningxia Province in China’s northwest.

Siemens will deliver what is currently its largest CO2 compressor to the plant, which has a capacity of four million tonnes per year, by the summer of 2015.

The four compressor trains each consist of one STC-GV integrally geared compressor driven by an SST-600 condensing steam turbine via an intermediate gear.

The compressors, each of which has six stages, are designed for a carbon dioxide volume flow rate of about 141,000 standard cubic metres per hour, allowing these new units to compress nearly twice the volume of CO2 as the predecessor model, Siemens said.

The compressor trains will be produced in Europe, while the Siemens joint venture in Huludao, China, will deliver the auxiliary systems and handle local project management and engineering.

Siemens will also supply gasification technologies, equipment and associated auxiliary systems for the project.

This was a repeat order, with chief executive of the compression business unit within Siemens’ Energy Sector Lennart Nilsson saying he was delighted the company had been selected again.

“With this order, we are helping enable China’s largest coal producer to use this raw material for petrochemical products – and in an environmentally safe fashion in terms of CO2 emissions,” he said.

“At the same time, we are strengthening our position on the Chinese market, which is important to us, and helping our customers achieve their economic and ecological goals.”

In 2009, Siemens delivered CO2 compressors with a volume flow rate of 83,000 cubic metres per hour and five coal gasifiers, each with a thermal power rating of 500 MW, for the coal chemical plant in Yinchuan, Ningxia.