SU150565A1 - Installation for steam and vapor-air hydrocarbon conversion - Google Patents

Description

Typical gas generating stations are known for producing water gas and gasifying solid fuels.

It is proposed to use these stations for steam and vapor-air conversion of hydrocarbon feedstock (natural gas or liquid hydrocarbons). Such an application of gas-generating stations of conventional design will make it possible to use sushi, equipment, more productively.

The use of gas generating stations for these purposes is based on the processes of periodic steam or vapor-air conversion of hydrocarbons using. regenerative method of heat transfer.

The generator is used as a converter, for which the necessary amount of refractory filling and catalyst is poured into the generator shaft. The bed of the bed and the catalyst is placed on a support grid of refractory materials.

The rest of the technological equipment of the gas generator strike (a steam superheater, a waste heat boiler, a scrubber, shut-off devices and automatic controls) is used for its intended purpose, as in conventional stations.

The operation of the installation after conversion is carried out as follows.

Heating of the plant ("hot blast") is produced by flue gases produced in the superheater furnace by burning gaseous or liquid fuels. The flue gases, the passage of the steam superheater nozzle and the converter charge, heat them up and are emitted into the atmosphere through the gas path of the recovery boiler.

No. 150565-2 -

To create an oxygen-free gaseous medium passing through the bed of the charge in the converter, and heating it to the required temperatures, an additional amount of fuel is fed into the stream of hot flue gases between the superheater and converters during the hot period. Such a heating scheme allows burning in the superheater furnace at temperatures allowed by conventional refractories, regulating, or liraing them with excess air.

. After warming up to the required temperatures, the unit switches to conversion ("cold blast"). Here, the steam is supplied to the steam superheater. In noTOic superheated steam, natural gas or another hydrocarbon feedstock is introduced in front of the Copvertor. The design of the mixing unit for superheated steam and hydrocarbon feedstock ensures an intrinsic mixing of the streams, in order to prevent the treatment of 3 ° C in a and and. with and well.

After the catalyst has cooled down to the conversion tolerated limit, the set1 switches back to warm up.

All flow control during switching is carried out automatically by programmed control devices.

For industries in which nitrogen-containing gases can be used (for example, an iron-steam method for hydrogen production, ammonia synthesis, and others), during the conversion period, grief in the furnace does not stop, but only decreases to the calculated intensity. In this case, it is more expedient to equip the steam superheater with one combined or two burners.

The operation of the unit with constant combustion in the superheater furnace allows to achieve higher thermal performance.

In order to more efficiently use the catalyst, its loading is carried out in a converter in several layers, which are interspersed with layers of inert refractory bedding. The ratio of the thickness of the catalyst layer and the layer of refractory backfill is determined by heat engineering calculations.

Subject invention

The use of gas generating stations for steam and vapor-air conversion of hydrocarbons.