The process of production of protective nitric atmosphere

 

(57) Abstract:

The invention relates to a process for the production of protective attnention atmospheres for metallurgical production of natural gas and air. The process of production of protective nitric atmosphere includes the synthesis of nitric mixture of natural gas and the diluting it with nitrogen, while nitric mixture synthesize sequential thermal reforming of natural gas with steam, followed by secondary reforming reaction mixture with air, catalytic additional oxidation of CO to CO2absorption purification from CO2and mahanirvana, with subsequent drying of the mixture and diluted with high purity nitrogen, obtained by low-temperature nitrogen from the air. Protective nitric atmosphere contains 4.5 to 5.0% hydrogen, the temperature of the dew point (-)57oC. the Technical result consists in simplifying technology, reducing consumption of steam and electricity.

The invention relates to processes for the production of protective nitric atmospheres of the natural gas and air used in the iron and steel industries, and can be used in chemical, Neftekhimik signs is the technological process of production of protective nitric atmospheres, described in the information source D. L. Greenberg. Chemical technology at the metallurgical plant. M.: metallurgy, 1983, S. 104, on which such an atmosphere obtained by mixing two components: a) nitric mixture produced by thermal dissociation of ammonia at a temperature of 800-900oC and low pressures (about 49 kPa) and b)technical nitrogen with aggregates air separation.

The disadvantage of this process is the complexity and high energy technologies and the need for purification of the entire mixture from oxygen and water sequential catalytic hydrogenation on palladium catalysts and dehydration by freezing and silikagelevye adsorbents. Obtained in this case, the protective gas contains 4-6% hydrogen, 94-96% nitrogen gas humidity corresponds to a dew point of (-) 45oC.

The aim of the invention is to simplify the technology and reducing energy consumption when the technology implementation process. The proposed process is as follows: natural gas is consistently first thermal (primary) reforming with water vapor, and then the secondary reforming with air. In the resulting gas mixture ka is animowany, she dried and mixed with nitrogen of high purity (99,99%), obtained by low-temperature nitrogen from the air.

The advantage of the proposed process is a significant energy savings through the use of new:

1) technologies for nitric mixtures;

2) nitrogen diluent in the form of high purity nitrogen, obtained by low-temperature nitrogen from the air.

Example 1. The process of production of protective nitric atmospheres of ammonia and air in the prototype was carried out according to the following scheme:

Thermal decomposition of ammonia-->nitric mixture + technical nitrogen-->hydrogenation on palladium catalyst-->dehydration--> protective nitric atmosphere. Obtained in this case, the shielding gas contains 4-6% hydrogen, 94-96% nitrogen gas humidity corresponded to a dew point of (-) 45oC.

Example 2. Nitric mixture synthesized by the proposed method sequential thermo catalytic reportingon natural gas with water vapor, and then the secondary thermal reforming reaction mixture with air, catalytic additional oxidation of CO to CO2the abs was drained by cooling to a temperature of 5-15oWith and separation under pressure of 80-100 kg/cm2to dew point(-)25-(-)30oC. Then it was diluted with high purity nitrogen, obtained by low-temperature nitrogen from the air in the amount of 4500-4700 m3per hour with a dew point of (-)70oWith the air separation unit. The result was obtained protective nitric atmosphere containing 4,5-5,0% of hydrogen and having a dew point of (-)57oC.

When the process of production of protective nitric atmospheres of the natural gas and air in accordance with the invention are excluded manufacturing processes thermal synthesis and subsequent decomposition of ammonia implemented in complex and energy-intensive equipment and processes for the hydrogenation of oxygen and drying the total weight of the protective nitric atmosphere are replaced by the drying process only the primary (before dilution) of the flow of nitric mixture. Processes consistent thermal refoming natural gas with water vapor, and then the secondary thermal reforming reaction mixture with air, catalytic additional oxidation of CO to CO2absorption purification from CO2and mahanirvana the two is the prototype.

During the implementation process of the proposed method increased reliability, decreased consumption of steam and electricity for own needs of production and reduced the number of maintenance personnel.

The process of production of protective nitric atmosphere, including the synthesis of nitric mixture of natural gas and the diluting it with nitrogen, characterized in that the mixture of nitric synthesize sequential thermal reforming of natural gas with steam, followed by secondary reforming reaction mixture with air, catalytic additional oxidation of CO to CO2absorption purification from CO2and mahanirvana, with subsequent drying of the mixture and diluted with high purity nitrogen, obtained by low-temperature nitrogen from the air.

 

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