SU937327A1 - Method of producing nitrogen and hydrogen containing controllable atmosphere - Google Patents

Description

(54) METHOD FOR PROCESSING NITROGEN-CONTROLLABLE NITROGEN

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The invention relates to the production of process gases and can be used to obtain a nitric gas mixture used in metallurgy, machinery, glass industry and other industries.

A known method for producing a nitric gas mixture by burning hydrocarbons in free volume with an air flow rate less than 1 and subsequent purification of products, combustion from carbon monoxide, carbon dioxide and water vapor 11

The disadvantage of this method is the large residual content of harmful impurities, leading to reduced restorative properties.

The closest to the invention in technical essence and the achieved result is a method of obtaining a nitric atmosphere controlled by burning hydrocarbons with air in a granular layer of refractory material at 1400-1800 ° C by steam conversion of the formed carbon monoxide ATMOSPHERE

type and subsequent purification from carbon dioxide and water vapor 2).

The disadvantage of this method is the increased oxygen content, which leads to a decrease in the recoverable properties of the controlled atmosphere.

The purpose of the invention is to increase the reducing properties of a controlled nitrogen atmosphere.

This goal is achieved by the fact that according to the method of producing a nitric controlled atmosphere, including the combustion of hydrocarbons with air in the granular layer of refractory material at 1400

J5 1800 ° С, steam co-version of carbon monoxide gi, subsequent purification from carbon dioxide and water vapor, the temperature of the lower part of the reaction zone of the combustion stage is maintained at 100-800 ° С.

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At. Thereby, this temperature is maintained by cooling the layer of the refractory material by evaporation of water or carbon dioxide taken out after the conversion of carbon monoxide.

Example. Natural gas, purified from sulfur compounds in the desulfurization system, enters the burner of the combustion chamber. Compressed air is also supplied there, which is mixed with natural gas in a volume ratio from 6: 1 to 9.8.1. The combustible mixture enters the upper part of the granular layer from electrofusion aluminum corundum, where it burns at 1400-1800 ° C. In front of the section of the granular layer of steel rings, condensate fed from the condensate system is injected through the sprayer into the combustion products, during evaporation of which the temperature of the combustion products decreases from 100-800 ° C. Combustion products enriched with water vapor due to evaporation of condensate enter the converter. After steam reforming of carbon monoxide in the presence of a catalyst, the nitric mixture is cooled in a refrigerator with separation of condensate discharged to the condensate system through a float condensate trap. The nitric – hydrogen mixture cooled further to 25–30 ° C is fed into the adsorption purification system to remove water vapor and carbon dioxide, after which the finished product is fed to consumption.

The resulting nitric mixture has the following composition, vol.%: Hydrogen (adjustable concentration) 0.5-25

Oxygen 0.0001

Nitrogen oxides0,00003

Water vapor0.001

Carbon monoxide0.005

Carbon dioxide0.005

NitrogenErest

The proposed method allows to reduce the oxygen concentration in the nitric acid.

mixture by 1.5-2 times, reduce the consumption of cooling water by 50 l / m of nitric mixture, increase the productivity of the process by 1.52 times.

The economic effect of the implementation of the present invention in enterprises of the glass industry, operating or installing installations for obtaining a hydrogen-hydrogen mixture from natural gas, is about 900,000 rubles. in year.

Claims (2)

1. A method for producing a nitrogen-controlled atmosphere, including burning hydrocarbons with air in a granular layer of refractory material at 1400-1800 ° C, steam reforming of carbon monoxide and subsequent purification from carbon dioxide and water vapor, characterized in that in order to increase the reduction properties of the target product, the temperature of the lower part of the reaction zone of the combustion stage is maintained at 100-800 ° C. 2. A method according to claim 1, characterized in that said temperature is maintained by cooling the layer of refractory material by evaporation of water or condensate taken after the conversion of carbon monoxide. Sources of information taken into account in the examination 1.Ioffe VB Basics of hydrogen production. L., 1960 p. J88 2. Author's certificate. USSR in accordance with the application N 2321256 / 23-26, cl. From 01 to 2/02, 1976.