CCS and Power Systems


Warm Gas Cleanup

Performer: NETL Office of Research and Development

Project No: FWP-2012.03.03 Task 5

Project Description

The Environmental Protection Agency (EPA) has established strict regulations for the trace contaminant emissions from integrated gasification combined cycle (IGCC) systems. The Department of Energy (DOE) performance goals for trace contaminant removal were selected to meet or exceed EPA's standard limits for contaminants, as well as to avoid poisoning of:

  • the catalysts utilized in making liquids from fuel gas
  • the electrodes in fuel cells
  • selective catalytic reduction (SCR) catalysts

The objective of the NETL's ORD Warm Gas Cleanup project is to assist in achieving both DOE and EPA targets for trace contaminant capture from coal gasification, while preserving the high thermal efficiency of the IGCC system. To achieve this, both lab and pilot-scale research is underway to develop sorbents capable of removing the following contaminants from high temperature syngas (up to 550°F):

  • mercury (Hg)
  • arsenic (As)
  • selenium (Se)
  • phosphorus (P)
  • antimony (Sb)
  • cadmium (Cd)

The removal of the trace contaminants at elevated temperatures preserves the higher thermal efficiency of the IGCC system. Unfortunately, most sorbents display poor capacity for elemental Hg and the other trace contaminants at elevated temperatures. Previous experience with sorbents in coal combustion flue gas has allowed for judicious selection of high-temperature candidate sorbents. The capacities of many different sorbents for Hg, As, Se and P have been determined in simulated gas streams.

Palladium-based sorbents are currently among the most promising candidates for high-temperature capture of trace elements from fuel gases. High temperature capture of the trace elements in one step reduces the footprint, cost, and complexity of the pollution mitigation method; and increases the certainty of the final disposition of the trace elements.

2nd Generation IGCC Plant Gas Cleaning Technology
2nd Generation IGCC Plant Gas Cleaning Technology

Project Details
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