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Method and system for carbon dioxide removal

A carbon dioxide, regeneration system technology, applied in the system field

Inactive Publication Date: 2016-03-23
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, at high molar concentrations of free ammonia, low temperature and high CO 2 Ammonia solvents have a tendency to precipitate ammonium bicarbonate under load, thus limiting the circulation capacity of the solvent between the absorber and regenerator

Method used

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  • Method and system for carbon dioxide removal
  • Method and system for carbon dioxide removal
  • Method and system for carbon dioxide removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Comparison of Carbon Capture Using Ammonia-Containing Solvents with Different Molar Concentrations

[0045] At low ammonia molarity, a larger proportion of bicarbonate is formed and more bicarbonate is soluble in solution. The use of high and low molar ammonia solvents with 90% CO is provided in Table 3 below. 2 Data captured for the comparison of the two conditions. The cycle capacity loss associated with lower concentrations of ammonia was overwhelmed by higher CO 2 Load partial compensation, as shown in Table 3. In this case, the ammonia concentration is reduced by a factor of 5.48, while the circulation rate in the absorber is correspondingly increased by a factor of 3.64. Low molarity and relatively high lean loading of CO 2 The resulting reduction in ammonia loss in the absorber is reduced by a factor of 6.3.

[0046]

[0047] table 3

Embodiment 2

[0048] Example 2: Precipitation Formation

[0049] In solutions with higher ammonia concentrations, compared with solutions with lower molar concentrations, high CO 2 The loaded solution starts to precipitate earlier. Provided in Table 4 below at different NH 3 Ammonium bicarbonate solubility index ("SI") at molarity. The data in Table 4 demonstrate that at 4.4°C, for a 10M solution, precipitation can occur at a load of 0.46, while at 4.4°C, for a 4M solution, precipitation requires a load of 0.66.

[0050]

[0051] Table 4

Embodiment 3

[0052] Example 3: Ammonia discharge from absorber

[0053] At lower ammonia molar concentrations, the operating system 100 may reduce ammonia emissions from the absorbing section 118 , 128 to the scrubbing section 130 . In one embodiment, absorber 110 may have three absorbing sections. It has been shown that with poor solution CO 2 As the load increases, eg, from about 0.23 to about 0.47, ammonia emissions decrease, eg, by about 35%.

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Abstract

A system and method are provided for removing carbon dioxide from a gas stream. One aspect of the method includes introducing a carbon dioxide-containing gas stream to an absorber. The gas stream is contacted with an ammonia-containing solvent for absorbing, with the ammonia-containing solvent, the carbon dioxide from the gas stream, thereby removing the carbon dioxide from the gas stream.

Description

technical field [0001] The present disclosure generally relates to the removal of carbon dioxide from gas streams. More specifically, the present disclosure relates to a system and method for precipitating ammonium salts as a means of separating a carbon dioxide-rich phase from a carbon dioxide semi-lean phase, thus reducing energy requirements during regeneration. Background of the invention [0002] Combustion of fossil fuels typically produces an exhaust stream (commonly referred to as a "flue gas stream") containing pollutants such as carbon dioxide (CO 2 ), sulfur oxides (SOx), nitrogen oxides (NOx), mercury and carbonaceous substances, and particulate matter such as dust or fly ash. To meet requirements established under certain laws and agreements, fossil fuel-fired plants subject the resulting flue gas stream to various processes and systems to reduce or eliminate the amount of pollutants in. [0003] In one example, carbon dioxide is removed from a gas stream by ...

Claims

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Application Information

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IPC IPC(8): B01D53/62
CPCB01D53/96B01D2252/102B01D2252/602B01D2255/804B01D2257/504B01D2258/0283B01D2259/124B01D53/62Y02C20/40Y02A50/20
Inventor F.维特斯G.费尔斯蒂格R.S.希维尔
Owner GENERAL ELECTRIC TECH GMBH