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Simultaneous upgrading and tritium removal process of heavy water

A heavy water and process technology, applied in heavy water and other directions, can solve the problems of large gas loss, affecting the process material balance, adverse process economy, etc., to improve the effect, reduce one-time investment and operating costs, and the process flow is simple and efficient. Effect

Active Publication Date: 2015-08-12
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

[0005] However, the above-mentioned literature only provides theoretical analysis results under specific conditions, and does not further investigate the key operating parameters and engineering feasibility of the process, such as: key operating parameters such as temperature and pressure in the catalytic exchange process; The adverse effects of gaseous impurities on the system; especially the rectification process of the above literature using only two separation columns will lead to D 2 Excessive gas loss affects the material balance of the entire process, which is not conducive to the economics of the process. At the same time, the multi-stage rectification process has not been optimized and designed

Method used

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  • Simultaneous upgrading and tritium removal process of heavy water
  • Simultaneous upgrading and tritium removal process of heavy water
  • Simultaneous upgrading and tritium removal process of heavy water

Examples

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Effect test

Embodiment 1

[0031] The HDO mole fraction in heavy water to be treated is 3%, and the tritium concentration is 1011 Bq / L, its HDO content is higher.

[0032] With Pt / C / PTFE as catalyst, with D 2 Perform isotope exchange with HDO and DTO in heavy water. The reaction is carried out in a catalytic exchange reaction device. The catalyst layer and packing layer of the reaction device are filled alternately. The packing layer is made of stainless steel θ rings. The liquid phase inlet of the catalytic exchange reaction device is set On the top, the liquid phase outlet is set at the bottom, the gas phase inlet is set at the bottom, and the gas phase outlet is set at the top.

[0033] In this embodiment, in the catalytic exchange reaction, the control reaction temperature is 30°C, the reaction pressure is 100KPa, D 2 The feed molar ratio with heavy water is 1:3. After the reaction through the catalytic exchange reaction device, the molar fraction of HDO in the product heavy water is 0.05%, and th...

Embodiment 2

[0038] The HDO mole fraction in heavy water to be treated is 0.3%, and the tritium concentration is 10 12 Bq / L, its content of tritium is higher.

[0039] With Pt / C / PTFE as catalyst, with D 2 Perform isotope exchange with HDO and DTO in heavy water. The reaction is carried out in a catalytic exchange reaction device. The catalyst layer and packing layer of the reaction device are filled alternately. The packing layer is made of stainless steel θ rings. The liquid phase inlet of the catalytic exchange reaction device is set On the top, the liquid phase outlet is set at the bottom, the gas phase inlet is set at the bottom, and the gas phase outlet is set at the top.

[0040] In the present embodiment, the control reaction temperature is 60°C, the reaction pressure is 200KPa, D 2 The feed molar ratio with heavy water is 1:4. After the reaction of the catalytic exchange reaction device, the protium in the product heavy water is 0.02%, and the tritium concentration is 10 10 Bq / ...

Embodiment 3

[0045] The HDO mole fraction in heavy water to be treated is 3%, and the tritium concentration is 10 12 Bq / L, its content of HDO and tritium is higher.

[0046] With Pt-SDB as catalyst, with D 2 Perform isotope exchange with HDO and DTO in heavy water. The reaction is carried out in a catalytic exchange reaction device. The catalyst layer and packing layer of the reaction device are filled alternately. The packing layer is filled with stainless steel triangular spiral packing. The liquid phase inlet of the catalytic exchange reaction device It is set on the top, the liquid phase outlet is set on the bottom, the gas phase inlet is set on the bottom, and the gas phase outlet is set on the top.

[0047] In this embodiment, the control reaction temperature is 90°C, the reaction pressure is 300KPa, D 2 The feed molar ratio with heavy water is 1:10. After the reaction of the catalytic exchange reaction device, the protium in the product heavy water is 0.05%, and the tritium conce...

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Abstract

The invention discloses a simultaneous upgrading and tritium removal process of heavy water, and belongs to the technical fields of heavy water upgrading and tritium removal. The simultaneous upgrading and tritium removal process of heavy water uses Pt / C / PTFE or Pt-SDB as a catalyst, and employs D2 to conduct isotope exchange with HDO and DTO in heavy water. The process provided by the invention avoids disadvantages of two separate devices in the traditional process for protium and tritium removal in heavy water, achieves simultaneous removal of protium and tritium, effectively reduces production cost and risks in the treatment process; in addition, by identifying key process parameters, the reaction effect of the upgrading and tritium removal process is ensured, effect of each treatment process is improved, and the economic performance of the whole process is improved.

Description

technical field [0001] The invention relates to a heavy water treatment process, in particular to a simultaneous heavy water upgrading and tritium removal process, which belongs to the technical field of heavy water upgrading and tritium removal. Background technique [0002] Heavy water is usually used as a neutron moderator and coolant for reactors. The quality of heavy water is directly related to the safety of reactors, and its treatment process has always been valued. During the operation of the reactor, heavy water will be exchanged with natural water (steam) in the environment through refueling or micro-leakage, so that protium (usually in the form of HDO) will be introduced into the heavy water. This process is called heavy water degradation; at the same time, heavy water The deuterium will capture neutrons to produce tritium (usually in the form of DTO), the total amount of tritium can reach 10 16 -10 17 At the Bq level, the radioactivity can account for 30% of th...

Claims

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Application Information

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IPC IPC(8): C01B5/02
Inventor 夏修龙熊亮萍侯京伟彭述明刘俊刘云怒陈晓军肖成建龚宇陈平张勤英
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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