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Integration of ITM Syngas and ITM Oxygen (with Vacuum or CO2 Sweep) Reactors for CO2 - Free Power

IP.com Disclosure Number: IPCOM000020524D
Publication Date: 2003-Nov-25
Document File: 2 page(s) / 80K

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Integration of ITM Syngas and ITM Oxygen (with Vacuum or CO2 Sweep) Reactors for CO2 - Free Power

Synthesis gas, a mixture of hydrogen and carbon monoxide, can be produced by oxidatively-reforming a hydrocarbon-containing stream which passes on one side of a non-porous, mixed conducting ceramic membrane, with oxygen from a hot, oxygen-containing gas, preferably air, which passes on the other side of the ceramic membrane. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen chemical potential gradient across the membrane to cause oxygen ions to migrate through the membrane.

Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot air and hydrocarbon-containing streams. Synthesis gas and nitrogen-enriched non-permeate products are withdrawn from the modules. A comprehensive review of ion transport membranes is given by M. Stoukides in Catalysis Reviews - Science and Engineering, 42(1&2), 2000.

The objective of the integrated ITM Syngas - Oxygen process is to produce a hydrogen product suitable for use as a fuel (gas turbines, fuel cells, etc.) while also capturing all or most of the carbon dioxide for possible sequestration.

A description of the proposed cycle and simplified process flow diagrams follow. The bracketed reference numbers appearing in the description are an aid to following Figure 1.

Air is compressed in a gas turbine. The compressed air [1] is heated by direct combustion with hydrogen or another fuel. Hydrogen offers the advantage of producing a carbon dioxide - free stream that will be emitted. The heated, vitiated air [2] is fed to an ITM Oxygen reactor that produces a low pressure oxygen product [3] and a nitrogen-enriched non-permeate stream [4]. The product oxygen gas goes through heat recovery and compression steps, and is then fed to a direct combustor to preheat a natural gas feed stream [5]. The natural gas is preheated by direct combustion with the oxygen and is then fed [6] to an ITM Syngas reactor and process. Optional piping allows some of the nat...