RU2634452C1 - Installation for catalyst recovery - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: installation consisting of a reflux condenser with a top and a bottom section, a refrigeration machine, a circulation device, a recuperative heat exchanger, a heater, and a catalytic reactor is proposed. During operation of the plant, the purge gas is mixed with nitrogen and hydrogen and fed through the recuperative heat exchanger and the heater to the catalytic reactor, where the reduction of the oxide form of the catalyst is carried out with hydrogen contained in the purge gas. The recovery products containing water vapour are circulated through the recuperative heat exchanger to the bottom of the reflux condenser, where it is cooled and dried under reflux conditions with a refrigerant supplied to/from the refrigeration machine and, at least, a portion of the purge gas, the balance excess of which is withdrawn. From the reflux condenser, as it accumulates, water condensate is withdrawn, the part of which is supplied to the circulation device as the working fluid, and air is supplied to the reflux condenser in the passivation stage of the catalyst.

EFFECT: reducing the consumption of nitrogen and hydrogen and reducing energy costs.

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Description

The invention relates to devices for the recovery of hydrogen catalysts in oxide form, and can be used in gas and petrochemical industries.

A device for producing a hydrogen-containing gas mixture is known [RU 160799, 04/10/2016, B01J 8/04, С01В 3/00], intended for the recovery of steam reforming catalysts and comprising a heating device, a mixer for associated petroleum gas with air, a catalytic reactor for producing a hydrogen-containing gas mixtures by air conversion and a heat exchanger, while the device is integrated with an associated petroleum gas conversion unit.

A disadvantage of the known device is the presence of water vapor and carbon oxides in a hydrogen-containing gas mixture, which leads to overheating of the catalyst due to the occurrence of a methanation reaction of carbon oxides, deposition of carbon on the surface of the catalyst and a decrease in the catalytic activity of the reduced catalyst [E.Z. Golosman, V.N. Efremov., Industrial catalysts for the hydrogenation of carbon oxides // Catalysis in industry, No. 5, 2012, p. 36-55].

Closest to the proposed invention is a facility for the recovery of a catalyst in a stream of a mixture of nitrogen and hydrogen [Unified requirements for the transportation, reception, storage, sieving, loading into apparatuses, recovery, passivation, oxidation and operation of desulfurization catalysts, natural gas conversion, carbon monoxide conversion, methanation and synthesis of ammonia. M .: ONTI GIAP, 1978, p. 97-111], which includes a heater and a catalytic reactor with a recovery products withdrawal line located on the purge gas supply line, which is formed by the supply lines of nitrogen, hydrogen and air.

The disadvantage of this installation is the high consumption of nitrogen and hydrogen discharged into the atmosphere along with the reduction products.

The objective of the invention is to reduce the consumption of nitrogen and hydrogen, reducing energy consumption.

As a technical result when using the proposed installation, a reduction in the consumption of nitrogen and hydrogen is achieved, as well as a reduction in energy consumption due to the equipment of the installation with a reflux condenser and devices for circulating purge gas and heat recovery.

The specified technical result is achieved by the fact that in the proposed installation, which includes a heater and a catalytic reactor with a recovery products outlet line located on the purge gas supply line, the feature is that a recovery heat exchanger, a circulation device and a reflux condenser equipped with an air inlet line, a purge gas outlet line and an aqueous condensate outlet line connected to the circulation device, equipped with a top a heat exchange section connected to the refrigeration machine with coolant input / output lines, and a lower heat exchange section connected to a purge gas outlet line, to which are connected the outlet lines of the balanced purge gas, nitrogen and hydrogen injections, after which a recovery heat exchanger is placed on it.

As a device for circulation, for example, a liquid ring compressor can be used. As the remaining elements of the device using any equipment of the appropriate purpose, known from the prior art.

Placing a recuperative heat exchanger on the recovery products outlet line and equipping the reflux condenser with a lower heat exchange section reduces the energy consumption for heating the purge gas and cooling the recovery products, respectively, which reduces energy consumption. Equipping the unit with a reflux condenser makes it possible to cool recovery products containing water vapor under reflux conditions, drain them and obtain a purge gas into which hydrogen is added to restore the catalyst loaded into the catalytic reactor. Placing the circulating device connected to the water condensate discharge line on the recovery products output line allows the purge gas to circulate with minimal energy consumption and allows the process to be carried out without discharging the entire stream of recovery products into the atmosphere, only the balance part of the purge gas being discharged, which reduces nitrogen consumption and hydrogen.

The proposed installation is shown in the attached figure and consists of a reflux condenser 1 with upper 2 and lower 3 sections, a chiller 4, a liquid ring pump 5, a recovery heat exchanger 6, a heater 7 and a catalytic reactor 8.

During operation of the installation, the purge gas supplied through line 9 is mixed with nitrogen and hydrogen supplied via lines 10 and 11, and through the heat exchanger 6 and heater 7 are sent to the reactor 8, where the oxide form of the catalyst is restored by the hydrogen contained in the purge gas. The recovery products containing water vapor, through a heat exchanger 6 through line 12 using a liquid ring pump 5, are fed to the lower part of the reflux condenser 1, where they are cooled and dried under reflux conditions by the refrigerant supplied through lines 13 to / from the refrigeration machine 4, and at least at least part of the purge gas supplied from line 9, the balance excess of which is discharged through line 14. From the reflux condenser 1, water condensate is discharged from the reflux condenser 1 along the line 15, part of which is supplied to the device 5 as a working fluid, and to the reflux condenser 1 at the stage catalyst passivation air is supplied through line 16. If necessary, air is fed to the purge gas supplying line 9 to the recuperation heat exchanger 6 (shown in phantom).

Thus, the proposed installation can reduce the consumption of nitrogen and hydrogen, reduce energy consumption and can be used in industry.

Claims (1)

A catalyst recovery installation, including a heater and a catalytic reactor with a recovery products outlet line located on the purge gas supply line, characterized in that a recovery heat exchanger, a circulation device and a reflux condenser equipped with an air inlet line and a purge outlet line are placed on the recovery products outlet line gas and a water condensate discharge line connected to the circulation device, equipped with an upper heat exchange section connected to the cold a flax machine with coolant in / out lines, and a lower heat exchange section connected to the purge gas outlet line, to which are connected the outlet lines of the balanced purge gas, nitrogen and hydrogen injections, after which a recovery heat exchanger is placed on it.

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