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Regeneration method for adsorbent and flue gas purifying method

An adsorbent regeneration and adsorbent technology, which is applied in the directions of combustible gas purification, combustible gas purification/reformation, separation methods, etc., can solve the problems of shortening the adsorption operation time, rapid decline in the activity of the regenerated adsorbent, etc., so as to suppress the generation of elemental sulfur. , Easy to operate, easy to operate effect

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of the present invention have found in practice that when the existing regeneration method is used to regenerate the raw adsorbent, the activity of the regenerated adsorbent decreases rapidly, and the breakthrough time (that is, the removal rate of the target pollutant is as low as 90% adsorption operation time) shortened problem

Method used

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  • Regeneration method for adsorbent and flue gas purifying method
  • Regeneration method for adsorbent and flue gas purifying method
  • Regeneration method for adsorbent and flue gas purifying method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0049] According to the first embodiment, all the reducing gas can be sent into the lifting section as the lifting medium, or part of the reducing gas can be sent into the lifting section as the lifting medium, and the remaining part of the reducing gas can be directly sent into the reduction reaction section bottom of. In the actual operation process, it can be selected according to the amount of the sulfide-adsorbed adsorbent, so that the amount of reducing gas used as the lifting medium is sufficient to lift the sulfide-adsorbed adsorbent to the reduction reaction section. From the perspective of further improving the effect of regeneration, the volume ratio of the reducing gas used as the lifting medium to the reducing gas directly sent to the bottom of the reduction reaction section is preferably 1:1-4, more preferably 1:1.5-3.5, further Preferably 1:2-3.

[0050] In the first embodiment, the temperature of the sulfide-adsorbed adsorbent entering the riser (ie, at the in...

Embodiment approach

[0088] By adopting the second embodiment, the reducing gas is contacted and reacted with the sulfide-adsorbed adsorbent, which can significantly reduce the pressure drop of the regeneration reactor while still obtaining better regeneration effect.

[0089] According to the regeneration method of the present invention, the reducing gas can be conventionally selected, whichever can reduce the sulfide adsorbed on the adsorbent. Generally, the reducing gas may be a gas commonly used in the field sufficient to reduce sulfides, and its specific examples may include but not limited to one or two or more of hydrogen, carbon monoxide, light hydrocarbons, and dry gases. The light hydrocarbon can be C 1 -C 5 alkanes, C 1 -C 5 olefins, preferably the C 1 -C 5 of alkanes. Specific examples of the light hydrocarbons may include, but are not limited to, one or more of methane, ethane, propane and its isomers, butane and its isomers, pentane and its isomers. The dry gas is preferably r...

Embodiment 1-7

[0119] The composition of the flue gas used in Examples 1-7 is as shown in Table 1, and the adsorbent used is fresh catalytic cracking catalyst (produced by Sinopec Qilu Catalyst Factory, model is MLC-500), and its composition and properties are listed in Table 2 out.

[0120] Table 1

[0121] components

SO x

NO x

N 2

O 2

h 2 o

CO 2

Content / Volume%

0.18

0.065

73.5

4.5

10

11.8

[0122] Table 2

[0123]

[0124] Among the examples 1-7, the mixed gas of hydrogen and argon is formulated into reducing gases with different hydrogen sulfide contents (as shown in Table 3) for regeneration, wherein the total content of hydrogen sulfide and hydrogen is 30% by volume, The content of hydrogen sulfide is shown in Table 3.

[0125] Embodiment 1-7 adopts figure 1 The regenerative reactor shown, the regenerative reactor includes a lifting section, a preheating section, a reduction reaction section, and a settling se...

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Abstract

The invention discloses a regeneration method for an adsorbent, belonging to the technical field of flue gas purification. The regeneration method comprises the following steps: conveying an adsorbenthaving adsorbed sulfide into a regeneration reactor for contact with reducing gas, and reducing at least a part of the sulfide so as to obtain the adsorbent with reduced sulfide content and regeneration tail gas, wherein the adsorbent having adsorbed sulfide and the reducing gas are conveyed, in the form of parallel flow, into a reduction reaction section of the regeneration reactor for a reduction reaction, and the adsorbent and the reducing gas in the reduction reaction section have respectively reached temperatures required for the reduction reaction, or the adsorbent and the reducing gasin the reduction reaction section are respectively heated to temperatures required for the reduction reaction. The invention also discloses a flue gas purifying method. As the method is applied to regeneration of the adsorbent having adsorbed sulfide, the production amount of elemental sulfur during regeneration can be effectively inhibited, and the regenerated adsorbent presents prolonged penetration time.

Description

technical field [0001] The invention relates to the technical field of purification of polluted gas, in particular, the invention relates to a regeneration method of an adsorbent and a flue gas purification method. Background technique [0002] Catalytic cracking (FCC) is the main technical means for the production of light oil products in my country. At the same time, SO x and NO x The environmental pollution caused by emissions has also attracted increasing attention. In the "Petroleum Refining Industry Pollutant Discharge Standard" (GB31570-2015) promulgated by the Ministry of Environmental Protection, the emission limits of air pollutants for catalytic cracking units are stipulated: SO x 100mg / Nm 3 , NO x 200mg / Nm 3 , and the limit requirements will become increasingly strict in the future. Therefore, the development of catalytic cracking unit SO x and NO x It is imperative to meet emission standards. [0003] CN101209391B discloses a method for removing sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01D53/02
CPCB01D53/02B01J20/3458
Inventor 张诗晓常学良李强杨克勇
Owner CHINA PETROLEUM & CHEM CORP
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