System for capturing CO2 from process gas
A process gas and gas technology, applied in the field of CO2 capture, can solve problems such as difficult to achieve effective regeneration of adsorbents
Inactive Publication Date: 2014-05-07
GENERAL ELECTRIC TECH GMBH
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Problems solved by technology
[0006] Efficient regeneration of sorbents for CO2 capture is difficult to achieve according to existing technologies
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[0047] Reactions that occur in the embodiments:
[0048] The adsorbed substance calcium oxide can interact with CO 2 react to form calcium carbonate. When making calcium oxide CaO and CO 2 On contact, CaCO is formed with the release of energy in the form of heat according to carbonation reaction 1 (R1) 3 . In systems of embodiments of the invention, R1 may occur, for example, in a first reactor, such as in a carbonator reactor.
[0049] R1:
[0050] CaO(s) + CO 2 (g) CaCO 3 (s), where ΔH r, 298 K = -170kJ / mol.
[0051] In the first reactor, R1 makes the CO in the process gas such as flue gas 2 The concentration is reduced, so that the gaseous effluent from the first reactor has a significantly lower concentration of CO than the inlet 2 concentration. In the case of flue gas, before capture or reaction according to reaction (1), CO 2 The concentration of can be 15%, for example. Reaction 1 may, for example, take place at or below 650°C and at a pressure of about...
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The present disclosure is directed to a system for capturing CO2 from a process gas. The system comprises a first reactor arranged to receive a stream of process gas and a particulate sorbent material comprising calcium oxide able to capture the CO2 present in the process gas such that calcium carbonate is formed, the first reactor comprising means for discharging CO2 depleted process gas, a first portion of particulate sorbent material having captured CO2 , and a second portion of particulate sorbent material having captured CO2 , a second reactor arranged to receive the first portion of particulate sorbent material from the first reactor, the second reactor comprising heating means arranged to cause release of CO2 from the particulate sorbent material by decarbonation of the calcium carbonate to form calcium oxide, the second reactor further comprising means for returning the first portion of particulate sorbent material to the first reactor and means for discharging a CO2 rich gas stream, and a third reactor arranged to receive the second portion of particulate sorbent material from the first reactor, the third reactor comprising means for supplying water to the second portion of particulate sorbent material to hydrate at least a part of a remaining portion of calcium oxide of the second portion of particulate sorbent material to form calcium hydroxide, the third reactor further comprising means for returning the second portion of particulate sorbent material to the first reactor.
Description
technical field [0001] The invention relates to CO capture from process gases 2 system. [0002] The invention also relates to CO capture from process gases 2 Methods. Background technique [0003] There is often the purpose of capturing CO from gases produced in power generation systems fueled by, for example, fossil fuels, gas or wood 2 To make the process more environmentally friendly and reduce global warming effects. The captured CO can then be 2 The gas is compressed and transported for storage at a suitable location such as in deep geological formations or deep ocean masses. CO removal from flue gas produced such as by absorption, adsorption, membrane separation and cryogenic separation 2 various known technologies. [0004] Dry methods for separating carbon dioxide from gas mixtures can utilize metal oxides as adsorbents. The metal oxides can form metal carbonates with carbon dioxide present at high temperatures. Carbon dioxide can be liberated from metal ca...
Claims
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IPC IPC(8): B01D53/62B01D53/96
CPCB01D2257/504B01D53/83Y02C10/06Y02C10/08B01D53/12B01D53/96B01D2251/404B01D2258/0283B01D2251/604B01D53/08B01D2259/128B01D53/62Y02C10/04Y02A50/20Y02C20/40
Inventor M.C.巴弗J.勒费韦雷C.维恩格特纳
Owner GENERAL ELECTRIC TECH GMBH