Siemens receives order for CO2 compressor trains

China’s Shenhua Ningmei Coal Group has placed a follow-up order with Siemens Energy for four identical CO₂ compressor trains for a coal liquefaction plant. The end customer is Shenhua Ningxia Coal Industry Group Co. Ltd. (SNCG), a subsidiary of the Shenhua Group, the largest coal producer in China.

The compressor trains are destined for a coal liquefaction plant in Ningxia Province, which lies in northwestern China. The plant has a capacity of 4 million tpa of liquefied coal. The compressor trains are scheduled for delivery in the summer of 2015. The four compressor trains each consist of one STC-GV integrally geared compressor, each of which is driven by an SST-600 condensing steam turbine via an intermediate gear. The scope of supply also includes the associated auxiliary systems.

Figure 1. Siemens will deliver to a coal liquefaction plant in Ningxia Province its largest STC-GV CO₂ compressors. The power plant lies in northwestern China.

The compressors, each of which has six stages, are designed for a CO₂ volume flow rate of approximately 141 000 m³/h), allowing these new units to compress nearly twice the volume of CO₂ as the predecessor model. The gas in the plant is compressed from a suction pressure of 1.25 bar to 68 bar. Each compressor has a rated output of 28 M). Part of the CO₂ gas compressed by the Siemens compressor train is used, among other things, as process gas for internal transport within the plant, while the unneeded portion of the CO₂ is vented.

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.

“We are delighted that the Shenhua Group has chosen Siemens once again,” said Lennart Nilsson, CEO of the Compression Business Unit within Siemens’ Energy Sector. “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. 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 m³/h and five coal gasifiers, each with a thermal power rating of 500 MW, for the coal chemical plant in Yinchuan, Ningxia.

Adapted from press release by Jonathan Rowland

Read the article online at: https://www.worldcoal.com/power/25042014/siemens_receives_order_for_co2_compressor_trains_for_coal_liquifaction_plant_in_china_coal754/