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Method for recovering 14C in 14C-containing exhaust gas

A technology of 14CO2 and exhaust gas, applied in separation methods, chemical instruments and methods, separation of different isotopic elements, etc., can solve problems such as difficult recovery

Pending Publication Date: 2022-01-28
718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no method for effectively recovering 14C in radioactive waste gas in the prior art
In particular, recovery becomes more difficult when the radioactive waste gas contains low levels of hydrogen, organic carbon and carbon dioxide

Method used

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  • Method for recovering 14C in 14C-containing exhaust gas
  • Method for recovering 14C in 14C-containing exhaust gas
  • Method for recovering 14C in 14C-containing exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0191] A method for recovering 14C in waste gas containing 14C, including:

[0192] a) Capture CO in exhaust gas containing 14C 2 , to obtain rich CO 2 gas

[0193] use figure 2 The carbon capture unit shown performs this step a). Specifically, the waste gas containing 14C (14CO 2 Content is 2×10 -12 v / v) Enter the first absorption tower 2 through the first feed port 1, and contact with the absorbent (ammonia solution) in the first absorption tower 2 to generate flue gas and absorb CO 2 of the absorbent. The flue gas is discharged from the top of the absorption tower 2 into the adsorption device 6, and is discharged after being adsorbed by activated carbon in the adsorption device 6. will absorb CO 2 The absorbed liquid is transported to the regeneration tower 3, and the regeneration gas mixture is generated after being regenerated by the regeneration tower. The regeneration gas mixture is sent to the second absorption tower 4 (i.e. ammonia absorption tower) for abso...

Embodiment 2

[0203] It is basically the same as above-mentioned embodiment 1, and the difference is only that its step a) adopts the following scheme:

[0204] use image 3 The carbon capture unit shown performs this step a). Specifically, the waste gas containing 14C (14CO 2 Content is 2×10 -12 v / v) Enter the adsorption device 9 through the second feed port 8. The adsorption device 9 is composed of 6 adsorption beds 10. The adsorption device 9 is configured to implement a combination of vacuum and temperature rise, so that the 14C-containing waste gas and the selective adsorption of CO 2 The adsorbent (zeolite molecular sieve) is contacted in the adsorption bed 10 to obtain the adsorbed adsorbent and remove the gas that is not adsorbed by the adsorbent, and then desorb the adsorbed adsorbent to obtain CO-enriched 2 Gas (CO 2 Content ≥ 99.5% by volume). The gas that is not adsorbed by the adsorbent is output through the second outlet 11, rich in CO 2 The gas is exported through the t...

Embodiment 3

[0206] It is basically the same as above-mentioned embodiment 1, and the difference is only that its step e) adopts the following scheme:

[0207] use Figure 8 The illustrated stationary unit performs this step e). Specifically, the eighth feed port 26 is in fluid communication with the ninth feed port 29, so that 14CO-rich 2 The gas enters the fourth absorption tower 30 through the ninth feed port 29, and reacts with the sodium hydroxide solution in the fourth absorption tower 30 to generate a sodium carbonate solution. The sodium carbonate solution is sent to the first scrubber 31, and the calcium hydroxide and the sodium carbonate solution are reacted in the first scrubber 31, so as to obtain a slurry containing calcium carbonate precipitate. The slurry containing the precipitated calcium carbonate is sent to the filtering device 32 for filtering the slurry containing the precipitated calcium carbonate to recover the filtrate and obtain a filter cake that can be used as ...

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Abstract

The present disclosure relates to a method for recovering 14C in a 14C-containing exhaust gas, the method The comprises: capturing CO2 in the 14C-containing exhaust gas to obtain a CO2-rich gas; converting CO2 in the CO2-rich gas into CO and / or CH4 to obtain a CO-rich and / or CH4-rich gas; performing isotope separating on the CO-rich and / or CH4-rich gas to obtain a < 14 > CO-rich and / or < 14 > CH4-rich gas; oxidizing < 14 > CO and / or < 14 > CH4 in the < 14 > CO-rich and / or < 14 > CH4-rich gas into < 14 > CO2 to obtain < 14 > CO2-rich gas; and fixing the < 14 > CO2 in the < 14 > CO2-rich gas. According to the invention, efficient recovery and reutilization of 14C in radioactive waste gas can be realized.

Description

technical field [0001] The present disclosure relates to 14C recovery, and more particularly to methods and systems for recovering 14C in 14C-containing exhaust gases. Background technique [0002] 14C is a radioisotope with strategic application value. It is usually used as a 14C radioisotope tracer and is mainly used for tracing in new drug development, medical testing, biological science and other fields, and has an irreplaceable role. [0003] 14C is ubiquitous in radioactive waste gases (for example, without limitation, from nuclear power plants), which will be converted into CO 2 and C n h m The gaseous form of 14CO is emitted to the environment, which has the following effects: (1) due to 14CO 2 Participating in the photosynthesis of plants, it is easy to be enriched in the food chain, thereby causing internal radiation to organisms; (2) due to the long half-life of 14C (5730 years), it will produce cumulative radiation dose. [0004] Based on this, if the 14C in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01B32/50B01D59/04B01D59/26
CPCC01F11/188C01F11/18C01B32/50B01D59/04B01D59/26
Inventor 李敏马艳玲任晓影赵瀛刘金玲王成伟于戈
Owner 718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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