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Nitrogen removal method and device for refinery hydrogen stream

A hydrogen and denitrification technology is applied in the fields of bypass denitrification device and compressor, hydrogen-rich stream denitrification, and hydrogen stream denitrification device, which can solve problems such as poor economic benefits and so on.

Active Publication Date: 2020-06-30
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

Moreover, if denitrification equipment such as membrane separation is directly connected to the main pipeline of the hydrogen-rich stream, the economic benefits will not be obvious due to the low nitrogen concentration and high pressure drop.
[0005] Due to the existence of the above problems, the prior art has not reasonably dealt with the removal of nitrogen in refinery gas

Method used

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  • Nitrogen removal method and device for refinery hydrogen stream
  • Nitrogen removal method and device for refinery hydrogen stream
  • Nitrogen removal method and device for refinery hydrogen stream

Examples

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Embodiment 1

[0044] Embodiment 1: In the 1.5 million tons / year hydrocracking treatment unit, a set such as figure 1 The specific operation process and effect of the shown intermittent denitrification device are described as follows:

[0045] When the hydrogenation process starts, the circulating hydrogen from the hydrogenation reactor contains a multi-component mixture such as hydrogen sulfide and nitrogen, and its volume flow rate is 330000Nm 3 / h, the purity of hydrogen is 88%, and the density is 0.26kg / m 3 , the pressure is 17.4MPa. In the recycling process of hydrogen circulation, first enter the desulfurization tower from the inlet of the desulfurization tower with a built-in cyclone separator, and then fully contact with the desulfurizer (lean amine liquid) entering the upper inlet of the desulfurization tower to remove the entrainment in the hydrogen stream sulfide: after the desulfurization agent (lean amine liquid) reaches a certain level, it will exit the tower from the liquid ...

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Abstract

The invention relates to the denitrification of refinery hydrogen streams, and provides a method and a device for denitrifying a refinery hydrogen stream. The method comprises the steps: not carrying out denitrifying treatment on the stream when the nitrogen content of the hydrogen stream is relatively low; feeding the nitrogen-containing hydrogen stream into the denitrifying device for denitrifying treatment when the nitrogen content of the hydrogen stream reaches a certain value, wherein the hydrogen stream requires to be fed to a compressor for pressurization after denitrification due to pressure drop caused during the denitrification. The nitrogen content is subjected to correlated measurement by using a monitoring device, and is used as a criterion for starting denitrifying operation. According to the method and the device, the hydrogen stream comprises a circulating hydrogen stream and a discharge stream of a hydrogen by-production device. The method can be used for optimizing equipment of the existing methods so as to increase the utilization ratio of byproduct hydrogen. The invention further provides the hydrogen stream denitrifying device.

Description

technical field [0001] The invention belongs to the field of chemical environmental protection treatment, and relates to a method and a device for denitrification of hydrogen-rich stream in a hydrogenation device. Specifically, the present invention adopts a bypass denitrification device and a compressor. When the nitrogen content in the hydrogen stream reaches a certain value, it is sent to the denitrification device for denitrification and then pressurized to avoid the nitrogen content in the hydrogen stream. The accumulation of nitrogen gas avoids possible adverse effects on the equipment caused by long-term operation, and at the same time, it can also utilize a part of the hydrogen in the waste gas, reducing the operating cost. The invention also relates to a hydrogen stream stream denitrification device. Background technique [0002] The hydrotreating process is an additional process commonly used in refining operations. These methods increase the value of low-value h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/22B01D53/047
CPCB01D53/047B01D53/22B01D2256/16B01D2257/102
Inventor 廖祖维阳永荣王靖岱蒋斌波
Owner ZHEJIANG UNIV
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