SU1143454A1 - Arrangement for obtaining controlled atmospheres - Google Patents

Abstract

1. A DEVICE FOR OBTAINING CONFIGURATED ATMOSPHERES containing a generator with a supply pipe for supplying source products and an generator that differs in that in order to get "1 sggmentation controllable atmospheres with high carburizing and restorative properties and reduce the environment of the environment, environmental factors, and reduce environmental protection of the environment, environmental factors, and reduce environmental factors, reduce the environment, environment, and reduce environmental protection of the environment, environmental protection, and reduce environmental protection of the environment, environmental factors, and reduce environmental protection of the environment, environmental factors, and reduce environmental protection of the environment, environment, and reduce environmental protection of the environment, environmental factors, and reduce environmental protection of the environment, environmental environment, environmental reduction environment and environmental properties with reduced carbon and regenerative properties and reduce environmental protection of the environment, environmental environment, environmental factors, and reduce environmental protection of the environment. with a generator by a sorption purification unit with a carbon dioxide removal pipe and a gas accumulator, the inlet of which is connected to the carbon dioxide removal pipe, and the output is connected to the pipe water zndogeneratora starting products. 2 .. The device according to claim 1, so that it is equipped with a drain block (L carbon dioxide) installed between the carbon dioxide drainage pipe and the gas accumulator (L carbon dioxide. 3. The device according to claim 2, exc. I’m doing so that the block is made in the form of successively installed adsorbers.

Description

The invention relates to the production of controlled atmospheres used in the heat treatment of metals, and can be applied in the chemical, petrochemical and metallurgical industries. A device for obtaining controlled atmospheres containing a device for producing an exothermic controlled atmosphere purified from carbon dioxide with an aqueous solution of monoethanolamine supplied with branch pipes supplying the gas-air mixture and removal of the finished atmosphere, as well as the carbon dioxide removal branch pipe 1. Disadvantage and this device are low quality carburizing atmosphere because of its low carburizing and recovery properties, and environmental pollution due to emission into the atmosphere desorbate (carbon dioxide) of the adsorbers. An endogenerator is known that contains a sealed lined casing with a retort housed in it with a catalyst, gas-burning burners and a drainage pipe connected to a water cooler, which is connected to a supply pipe. exogaz in retort, equipped with navpyOKOM removal of ready controlled atmosphere,; the composition of which is 20% CO, 20% Nl and 60% 21. The disadvantage of this device is the low carburizing and reducing properties of the resulting atmosphere. The closest to the invention is a device for producing controlled atmospheres, containing an endogenerator with an inlet pipe for supplying the original products and an exo generator, producing a classical endog and crude exogas 3. The aim of the invention is to obtain cemented controlled atmospheres with enhanced carburizing and reducing properties and environmental pollution reduction. The goal is achieved by the fact that a device for producing controlled atmospheres, containing an endogenerator with an inlet for supplying initial products and an exogenerator, is equipped with a sorption purification unit connected to an exogenerator with a carbon dioxide discharging pipe and a gas accumulator, the inlet of which is connected to the carbon dioxide discharging pipe, and the output pipe supplying the source of endogenous products. In addition, the device is equipped with a carbon dioxide drying unit installed between the Ztlerod dioxide outlet pipe and the gas accumulator. The drying unit is designed as successively installed adsorbers. The drawing shows the proposed device. The device consists of an oscillator 1, equipped with a sorption purification unit 2 with a carbon dioxide outlet 3 connected in series with a flow booster 4, a gas storage 5 and a flow regulator 6 with a feed 7 outlet of the endogenerator 9. The adapter 7 is also connected With the pipeline 10 hydrocarbon gas, and the retort is equipped with a pipe 11 for removal of the cementing controlled atmosphere, and between the pipe 3 and the gas accumulator 5 a block 12 of carbon dioxide drying can be installed, including 13 with two adsoroera tripping valve 14. The device operates as follows. The products of the conversion of hydrocarbon gas with air with an air flow ratio of 0.65-0.95 obtained in the exogenerator are cleaned in block 2 of sorption purification from carbon dioxide with a 15% aqueous solution of monosanolamine, resulting in the formation of purified exogas. Then, a carbon dioxide-saturated solution of regenerated 5a, and the released desorbate through the nozzle 3 of the carbon dioxide removal through the flow rate booster 4 is fed into a carbon dioxide solution. 5 gas saver. From the accumulator of gas through the regulator 6 of the flow rate, carbon dioxide enters the nozzle 7 for supplying initial products to the retort 8 of the generator 9, and the hydrocarbon gas is fed through the pipeline 10 into this nozzle. In the retort of the generator in the presence of a catalyst heated to 1000-1100 ° С, an endothermic process of hydrocarbon gas conversion by carbon dioxide proceeds through one of the following reactions: СН4 + CQ2 2СО + (I) ЗСО 6СО + 4Н2 (2) 400 - 8СО + 5Н2 - (3) The search for carbon dioxide in traces of water vapor also reacts with hydrocarbon gas: CH -t CO + LNg (4) SO4 + 7H, 2 (5) CdNad 4H2O-4CO + PHgO 6) Since water vapor An insignificant amount (about 2%) enters the retort, and when they interact with hydrocarbon gases, the same oxides are formed. s of carbon and hydrogen, the practical effect of the composition of the carburizing they do not have a controlled atmosphere. 3J143 Thus, an atmosphere containing 5061, 5-50% H.5 is fed to the consumer in accordance with reactions (1) (3) from the socket 11 of the grouting control outlet; to the composition (4) (6) of the composition of the final cementation atmosphere, then the carbon dioxide section 12 is installed between the pipe 3 and the gas accumulator 5, drying the carbon dioxide section 12, including the supply adsorber 13, the gas to which the shut-off valve 14 is closed. the device allows you to get a controlled atmosphere the sphere and cement of scientific research institutes of metals and alloys that do not contain ballast nitrogen, which significantly increases its mass capacity but carbon and reducing properties due to an increase in hydrogen content (all known controlled atmospheres based on hydrocarbon gases contain 40-96% N. Addition The obtained in the device atmosphere 3-6% ammonia allows to obtain a nitrocementation controlled atmosphere with improved properties and 25 to nitrate, since the absence of molecular nitrogen in it contributes to the displacement of the dissociation ammonia 2NH g N NZ to the right, i.e. towards the formation of atomic nitrogen. The atmosphere obtained in the proposed device makes it possible to achieve in products of a substantially better distribution of the carbon fiber over the height of the cemented layer 8 0.8 mm. The change in the content of jT-lerod ria is this, depth is about 100%, where C and C (is the carbon content, respectively, in the surface layer and at a depth from the metal surface is given in Table 1. Known (3 Thus, the atmosphere 1 and 2, obtained in the proposed device, allow to obtain an improved carbon distribution over the height of the cemented layer by a factor of 2-3, Due to a better distribution of carbon, the service life of products is prolonged. Table 2 shows the duration of operation of cemented products in the above atmosphere . T a b l e 2

The economic effect due to the increase in service life and the drill bits sharpened, cemented in the pusher assembly in the atmosphere, half in the proposed device, will be 229.3 thousand rubles. in year. The proposed device allows two controlled atmospheres at the same time: a new cementation atmosphere and a purified exothermic atmosphere (purified sulfur dioxide).

Experiments show that a cement-based atmosphere with an attitude close to

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1, i.e., the atmosphere obtained in the proposed device allows a 4-fold increase in the resistance of open electric heaters in weather and heat treatment furnaces (from 2500 to 10000 hours |. The proposed device also reduces environmental pollution by using carbon dioxide in the production of the cementing atmosphere. Earlier this carbon dioxide in the amount of 9-12% of the performance

installation, was thrown into the surrounding atmosphere.

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Claims (3)

1. DEVICE FOR OBTAINING CONTROLLED ATMOSPHERES, containing a generator with a feed pipe and an exogenerator, characterized in that, in order to obtain controlled cementing atmospheres with enhanced carburizing and reducing properties and to reduce environmental pollution, it is equipped with a sorbing unit connected to the exogenerator for cleaning with a carbon dioxide outlet pipe and a gas storage, the inlet of which is connected to the carbon dioxide outlet pipe, and the outlet - with a supply pipe and the starting products of the endogenerator. 2 .. The device according to π. 1, characterized in that it is provided with a carbon dioxide drying unit installed between the carbon dioxide outlet pipe and the gas storage unit. 3. The device according to p. ’2, and the fact that the drying unit is made in the form of sequentially installed adsorbers. ί