Method and Apparatus for Adiabatic Calcium Looping

摘要

A method and apparatus for decarbonizing gases using pressure swing in a first and second pressure vessel that each comprise a fixed bed sorbent. Syngas and steam are received in the first pressure vessel. A carbonation reaction is performed in the first pressure vessel that reacts carbonaceous species in the received syngas with the received steam to produce carbon dioxide and hydrogen. Decarbonated syngas is exhausted from first pressure vessel. A calcination reaction is performed in the second pressure vessel to produce carbon dioxide. A vacuum is provided to the second pressure vessel that causes carbon dioxide to exhaust from the second pressurized vessel at a pressure that substantially follows the decomposition pressure line.

主权项

1. A system for decarbonizing gases using pressure swing and a pair of fixed bed pressurized reactors, the system comprising:
a) an input gas manifold comprising a plurality of valves and having at least one input that receives syngas and steam; b) a pair of pressure vessels comprising a first and second pressure vessel, each of the first and second pressure vessel comprising:
i. a fixed bed of sorbent;ii. an input that is coupled to an output of the input gas manifold; andiii. an output; c) an output gas manifold comprising a plurality of valves and having a first input that is coupled to the output of the first pressure vessel and a second input that is coupled to the output of the second pressure vessel; d) a valve controller having at least one output that is coupled to the input gas manifold and at least one output that is coupled to the output gas manifold, the valve controller controlling the plurality of valves in each of the input and output gas manifolds so that when the fixed bed sorbent in one of the first or second pressure vessels is saturated by carbon dioxide, at least one valve is actuated to exhaust the carbon dioxide through the output manifold and at least one valve is actuated to create a vacuum in the other of the first and second pressure vessel so that the decarbonized gases are exhausted; and e) a compressor comprising an input port coupled to a port of the output gas manifold, the compressor providing enough vacuum to the output gas manifold so that when the first or second pressure vessel exhausts CO2 their partial pressure is below a decomposition line for calcium carbonate.