Technology for low-temperature pyrolysis treatment of intermediate-and-low-radioactivity degradable waste

A low-temperature pyrolysis and low-radioactive technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems of secondary pollution and low volume reduction rate, and achieve the effects of reduced treatment, reduced storage, and eliminated hazards

Inactive Publication Date: 2017-05-31
杨红波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These treatment methods generally have problems such as low volume reduction rate and easy to cause secondary pollution.

Method used

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  • Technology for low-temperature pyrolysis treatment of intermediate-and-low-radioactivity degradable waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a low-temperature pyrolysis process for treating low- and medium-level radioactive degradable wastes, the process is as follows:

[0024] A process for low-temperature pyrolysis treatment of low- and medium-level radioactive degradable waste, the process is as follows:

[0025] (1) Low-temperature pyrolysis treatment: carry out negative-pressure pyrolysis reaction on low- and medium-level radioactive degradable waste to convert it into small molecule combustible gas and solid ash. The low-temperature pyrolysis treatment pressure is -100Pa and the temperature is 550°C ;

[0026] (2) Thermal oxidation treatment: the small molecular combustible gas obtained by low-temperature pyrolysis treatment is subjected to thermal oxidation treatment, and through a sufficient reaction with oxygen, it is converted into tail gas including carbon dioxide, nitrogen oxides, and sulfides and a small portion of residues. Thermal oxidation treatment reaction tempe...

Embodiment 2

[0032] Such as figure 1 As shown, a low-temperature pyrolysis process for treating low- and medium-level radioactive degradable wastes, the process is as follows:

[0033] A process for low-temperature pyrolysis treatment of low- and medium-level radioactive degradable waste, the process is as follows:

[0034] (1) Low-temperature pyrolysis treatment: carry out negative pressure pyrolysis reaction on low- and medium-level radioactive degradable waste to convert it into small molecular combustible gas and solid ash. The low-temperature pyrolysis treatment pressure is -500Pa and temperature is 350°C ;

[0035] (2) Thermal oxidation treatment: The small molecule combustible gas obtained by low-temperature pyrolysis treatment is subjected to thermal oxidation treatment, and through a sufficient reaction with oxygen, it is converted into tail gas and a small part of residues including carbon dioxide, nitrogen oxides, and sulfides. is 1200°C;

[0036] (3) Tail gas purification tr...

Embodiment 3

[0040] Such as figure 1 As shown, a low-temperature pyrolysis process for treating low- and medium-level radioactive degradable wastes, the process is as follows:

[0041] A process for low-temperature pyrolysis treatment of low- and medium-level radioactive degradable waste, the process is as follows:

[0042] (1) Low-temperature pyrolysis treatment: carry out negative-pressure pyrolysis reaction on low- and medium-level radioactive degradable waste to convert it into small molecule combustible gas and solid ash. The low-temperature pyrolysis treatment pressure is -250Pa and the temperature is 400°C;

[0043] (2) Thermal oxidation treatment: The small molecular combustible gas obtained by low-temperature pyrolysis treatment is subjected to thermal oxidation treatment, and through a sufficient reaction with oxygen, it is converted into tail gas and a small part of residues including carbon dioxide, nitrogen oxides, and sulfides. is 1000°C;

[0044] (3) Tail gas purification ...

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Abstract

The invention discloses a technology for low-temperature pyrolysis treatment of intermediate-and-low-radioactivity degradable waste. The technical process includes the steps that the intermediate-and-low-radioactivity degradable waste is subjected to low-temperature pyrolysis and converted into small-molecular combustible gas or solid coal slag, and the coal slag is subjected to a further oxidation reaction so that residual coal in the coal slag or waste which is not completely reacted thoroughly reacts; the gas is completely converted into oxidized gas through a thermal oxidation reaction, the gas is treated through a purification system so as to meet the standard and be exhausted, and the coal slag generated after oxidation is subjected to ceramic-like solidification. The technology solves the problems about storage and accumulation of degradable articles in the nuclear power industry, overcomes the defects of existing related treatment technologies, and achieves harmless volume reduction and weight reduction treatment of intermediate-and-low-radioactivity degradable products in the nuclear power industry or the military industry through pyrolysis heating and oxidation.

Description

technical field [0001] The invention relates to the field of degradable waste treatment, in particular to a process for low-temperature pyrolysis treatment of medium-low radioactive degradable waste. Background technique [0002] The radioactive solid waste generated during the operation of nuclear power plants is divided into two categories according to the source: process waste and technical waste. Technical waste refers to all kinds of maintenance waste generated during the maintenance process, mainly solid waste generated from maintenance activities in the control area, including plastic cloth, absorbent paper, gloves, rags, scrapped work clothes, air suits and scrapped equipment, parts, insulation materials, building materials, etc. Carefully classify the maintenance waste collected in the control area, and then compress and pack it. According to statistics, about 87% of maintenance waste is combustible waste, of which plastic products account for a large proportion; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/30
CPCG21F9/30G21F9/308
Inventor 杨红波张召文魏家奎
Owner 杨红波
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