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Method for determining the degree of saturation of solid ammonia storage materials in containers

By recording the heating time and desorption pressure, combined with the initial temperature and target pressure, the saturation degree of the solid ammonia storage material is calculated, which solves the problem of difficulty in determining the saturation degree in the existing technology, optimizes the ammonia resaturation process, and ensures NOx conversion performance and fuel efficiency.

Inactive Publication Date: 2012-11-14
AMMINEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is unclear whether such an approach actually works satisfactorily

Method used

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  • Method for determining the degree of saturation of solid ammonia storage materials in containers
  • Method for determining the degree of saturation of solid ammonia storage materials in containers
  • Method for determining the degree of saturation of solid ammonia storage materials in containers

Examples

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Embodiment Construction

[0038] Figure 1A An example of a device in which the present invention can be applied is shown. The storage container 1, which can be made of, for example, steel or aluminum, contains a heating element 2 inside the storage material 3, and the container has an outlet pipe 4 that allows ammonia to flow out during the desorption process by heating. It also allows supply from different Source (e.g., larger storage container 10( Image 6 )) The pressure of ammonia to resaturate the storage material. The heater may be an electric heater having a power source 5. Using the pressure sensor 8 connected to the pipe 4 ( Image 6 Shown) to perform pressure measurement.

[0039] Figure 1B The same part is shown, but here the storage material is partially degassed after some ammonia has been desorbed by heating the part. The degassing part 6 is usually closest to the heat source, while the saturated material 3 is far away from the heat source. Line 7 shows the front, where the material is ...

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Abstract

The invention relates to a method for determining the degree of saturation of solid ammonia storage materials in containers. A method is provided for estimating the degree of saturation (S) of a reversible solid ammonia storage material (3) in a storage unit (1). The storage unit (1) is equipped with a heater (2) to release ammonia and a connected tube (4) for ammonia flow. The initial temperature (TINIT) is measured with a sensor (9) in or around the storage unit (1) before any heating is initiated. Heating is initiated while recording the active time of heating (t) or the amount of energy (Q) released by the heater. The desorption pressure created by solid storage material in the storage unit (1) is measured via a pressure sensor (8) in fluid communication with the storage unit (1). The time (t TARGET), or the heat (Q TARGET) where the pressure reaches a certain target pressure (PTARGET) is recorded.; The values of the target-pressure time (t TARGET), or the target-pressure heat (Q TARGET), and the initial temperature (TINIT) are used to compute an approximate degree of saturation (S).

Description

Technical field [0001] The present invention relates to the use of solid ammonia storage materials as a source of ammonia during ammonia consumption. By heating, controlled thermal desorption from the solid is utilized, so that ammonia can be obtained from the rechargeable solid storage material. Specifically, the present invention relates to a method for determining the approximate saturation level of a storage material through a process during startup. This achieves a function similar to the filling degree of a liquid container. Background technique [0002] Ammonia is a widely used chemical in many applications. One particular application is as a selective catalytic reduction (SCR) reducing agent for NOx in exhaust gas from a combustion process. [0003] For most applications, especially in the automotive industry, it is too dangerous to store ammonia in a container as a pressurized liquid. Urea is safe, but it is an indirect and impractical method for mobile ammonia transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/00F01N3/20
CPCF01N2900/1808F01N2900/1811Y02T10/24F01N2610/06C01C1/006F01N2610/10F01N2900/0408F01N2610/1406F01N3/208F01N2610/02Y02A50/20Y02T10/12B01D53/9495G01N7/16
Inventor T·约翰内森J·约翰森J·H·左森H·施密特U·J·奎德
Owner AMMINEX
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