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Method and system for overheating near-critical water oxidation of unsymmetrical dimethylhydrazine waste liquor

A technology of near-critical superheat and unsymmetrical dimethylhydrazine, which is applied in chemical instruments and methods, oxidized water/sewage treatment, natural water treatment, etc. It can solve the problem that intermediate products are difficult to meet the emission standards and the ratio of chemical reagents is difficult to control. , elimination and other issues

Inactive Publication Date: 2016-07-20
ENG DESIGN & RES INST OF GENERAL ARMAMENTS DEPT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural purification method to treat unsymmetrical dimethylhydrazine waste liquid is an effective, economical, applicable, simple and energy-saving sewage treatment method, but the treatment time is long, and the pollutants in the treatment process will cause new pollution to the surrounding environment after volatilization. When the concentration of pollutants is high, it is difficult to meet the emission standards, so it has been replaced by new technologies in recent years
The chlorination method mainly uses chlorine and chlorine preparations as oxidants to degrade unsymmetrical dimethylhydrazine pollutants. It has the characteristics of fast treatment speed. The disadvantage is that the intermediate products such as nitrosamines and chlorinated hydrocarbons produced during the treatment process are difficult to meet the emission standards. requirements, and because it is difficult to control the proportion of various chemical reagents added in the treatment process, it has also tended to be eliminated in recent years
However, when the waste liquid concentration is 0.05%-50%, the heat value of the waste liquid is not high enough to use the combustion method, and there is no targeted treatment technology in actual use

Method used

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  • Method and system for overheating near-critical water oxidation of unsymmetrical dimethylhydrazine waste liquor
  • Method and system for overheating near-critical water oxidation of unsymmetrical dimethylhydrazine waste liquor
  • Method and system for overheating near-critical water oxidation of unsymmetrical dimethylhydrazine waste liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0045] For the untreated unsymmetrical dimethylhydrazine waste liquid with a concentration of 4.74wt%, oxygen is used as an oxidant, and the amount of the oxidant is 0.9-1.1 times the oxygen demand calculated according to the chemical reaction formula. Add 60ml of unsymmetrical dimethylhydrazine liquid in 1 liter of water, prepare 10 liters of unsymmetrical dimethylhydrazine solution of this concentration as the waste liquid to be treated, put the prepared waste liquid into figure 1 In the waste liquid tank 2, inject 10 liters of tap water in the clean water tank 1, close the waste liquid shut-off valve 4, open the clean water shut-off valve 3, close the back pressure valve 14, open the waste liquid pump 5, and supply the first preheater 6 of the system , The second preheater 7 and the reactor 8 are filled with clean water, and the heating facilities of the first preheater 6, the second preheater 7 and the reactor 8 are turned on at the same time, and the temperature of the pre...

Embodiment 2

[0049] Same as Example 1, except that the unsymmetrical dimethylhydrazine waste liquid with a concentration of 7.37wt% is used, and the dosing ratio of the oxidant is 1.0-1.2. Add 100ml unsymmetrical dimethylhydrazine pure liquid in 1 liter of water, prepare altogether 5 liters as waste liquid to be treated, operation process is identical with example 1, and detection result is as shown in table 2. The removal rate of chemical oxygen demand (COD) reaches 99.96%, the removal rate of total organic carbon (TOC) reaches 99.96%, and other indicators meet the emission requirements of GJB3485A-2011.

[0050] Table 2 Test results of drainage samples

[0051]

[0052] It can be seen from Table 1 and Table 2 that after treatment, the COD removal rate of the pollutant index reaches more than 99.95%, and the COD, formaldehyde, pH, and ammonia nitrogen in the effluent all meet the discharge requirements of GJB3485A-2011, realizing the pollutant The up-to-standard discharge solves the p...

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Abstract

The invention discloses a method and a system for overheating near-critical water oxidation of unsymmetrical dimethylhydrazine waste liquor. According to near-critical conditions, the temperature is higher than the water critical temperature of 374.15 DEG C, and the pressure is smaller than the water critical pressure of 22.13Mpa. Certain oxygen is added during reaction, pollutants of the unsymmetrical dimethylhydrazine waste liquor can be degraded quickly to become harmless, and qualified waste liquor discharge is realized. Compared with super-critical water oxidation methods, the method has the advantages that system working pressure is reduced by near-critical water, requirements on reactor materials are lowered, system application safety is improved, system service life is prolonged, and device cost is reduced. The method has the advantages that device structure is simple, reaction heat in the process of waste liquor treatment can be recycled, follow-up reaction is maintained, and accordingly, treatment cost is saved.

Description

technical field [0001] The invention relates to the fields of organic waste liquid treatment and resource recycling. More specifically, it relates to a method and system for oxidizing unsymmetrical dimethylhydrazine waste liquid with superheated near-critical water. Background technique [0002] Unsymmetrical dimethylhydrazine is one of the main propellant fuels for my country's space launch. Because of its high calorific value, large specific impulse, and easy storage at room temperature, it is widely used in space launch power devices. Unsymmetrical dimethylhydrazine is a colorless liquid with certain volatility and belongs to Class III toxic substances. Unsymmetrical dimethylhydrazine is flammable and explosive. During the production, transportation and use of unsymmetrical dimethylhydrazine, a certain amount of waste liquid containing unsymmetrical dimethylhydrazine will be produced. The safe disposal of unsymmetrical dimethylhydrazine waste liquid with different concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/36
CPCC02F1/727C02F2103/36
Inventor 侯瑞琴刘占卿张统田江霞李玉良
Owner ENG DESIGN & RES INST OF GENERAL ARMAMENTS DEPT
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