RU2131764C1 - Methane converter mixer - Google Patents

Abstract

FIELD: chemical industry; manufacture of special purpose equipment used in ammonia production lines. SUBSTANCE: methane converter mixer includes cylindrical housing with bottom where the following components are arranged: device for forming flow of one of gaseous media to be mixed which consists of taper ferrule with sleeve, cylindrical ferrule and solution forming circular passage together with inner walls of housing and bottom; inlet branch pipe located coaxially relative to cylindrical housing on side opposite to bottom; injectors for delivery of media to be mixed to mixing zone which are secured in bottom and are communicated with branch pipe through circular passage. Flow forming device is provided with central gas duct connecting the inlet branch pipe with bottom portion of circular passage. Gas duct is made in sectional form consisting of upper and lower sleeves interconnected telescopically; its upper end is connected through ring secured on casing and lower end is secured on taper ferrule. Gas duct provides for intensive cooling of bottom and cylindrical ferrule by gas being mixed. Bottom is spheroconical in shape. Injectors are secured on body by means of detachable joint; diameter of lower sleeve exceeds diameter of upper sleeve; supply tubes are secured on bottom through detachable joints. EFFECT: facilitated procedure of manufacture; improved temperature conditions of mixer and consequently increased service life. 1 dwg

Description

 The invention relates to the field of the chemical industry in the production of synthesis gas from natural hydrocarbons, and in particular to mixers for steam-gas and steam-air mixtures of a methane converter, for example, a second stage, and can be used in the new design or modernization of existing methane converters in ammonia production lines.

The process of obtaining a nitrogen-hydrogen mixture by methane conversion consists of a number of successive stages. Currently, two-stage catalytic conversion of methane is mainly used in the presence of water vapor and air as oxidizing agents. In the first step, methane conversion is carried out in a tubular reactor. In the second stage, the conversion of residual methane with a steam-air mixture is carried out in a shaft converter. Due to the oxidation of residual methane, the temperature in the installation zone of the mixer is maintained in the range of 1050 - 1100 ^o C.

 The mixer is one of the most important units of a methane converter of the 2nd degree, operating under conditions of high temperatures, speeds and gas pressure, as well as under the conditions of corrosive and erosive effects of combustion products on it. The severe working conditions of the mixer are also due to the influence of thermocyclic loads, which are one of the main causes of premature destruction of the mixer bottom.

 There are various designs of mixers that characterize the prior art in this field, for example, by AS 1 473 824, cl. B 01 F 7/04, application 4154929/31/26 dated 02.12.86, comprising a housing with nozzles for supplying the main and mixed components and for removing the finished product; by A.S. 1 430 093, cl. B 01 F 11/02, application 4159105 / 31-26 of 12/10/86, containing a mixing chamber and two jet emitters with inlet nozzles, etc.

 Also known device for the production of synthesis gas according to patent 1 478 995, class. B 01 J 7/00, application 4028090 / 23-26 from 09/05/86 from hydrocarbons, in particular natural gas, in the presence of a catalyst with a reforming chamber, gas supply pipes and mixed gas pipes; installation for producing hydrogen-containing gas by conversion of hydrocarbons by AS 1 634 310, cl. B 01 J 8/06, application 4661809/26 of 03/13/89, containing a converter with inlet and outlet pipelines, etc.

 The technological scheme of the two-stage catalytic conversion of methane in the presence of water vapor and air as oxidizing agents is contained in the book “General Chemical Technology” edited by I.E. Furmer, Higher School Publishing House, Moscow, 1970, p. 93 - 99.

 By the number of features common with the proposed mixer, its closest analogue can be adopted by the reactor mixer according to copyright certificate N 1 549 575, class. B 01 J 8/00. This mixer contains a cylindrical body with a bottom, a device for forming a flow of one of the mixed gaseous media, equipped with a central gas duct made of composite from the upper and lower glasses, telescopically connected to each other, an inlet pipe located opposite the bottom.

 The known mixer does not provide efficient heat transfer between the mixed gaseous media, which may cause premature failure of the apparatus.

 The purpose of the invention is to increase the operational reliability of the mixer.

 The essence of the developed mixer is illustrated in the drawing.

 The mixer contains: 1 - pipe for supplying mixed gas, 2 - socket, 3 - cylindrical shell, 4 - outer cup, 5 - upper cup, 6 - lower cup, 7 - conical shell, 8 - bottom, 9 - nozzle, 10 - ring grate, 11 - ring for securing the upper glass of the gas duct.

 In the drawing, arrows indicate the directions of motion of the main and mixed gases.

 The mixer operates as follows. The main gas through the annular grate 10 is discharged into the zone of the reactor of the Converter. The mixed gas is supplied through the pipe 1, then through the upper glass 5, the lower glass 6 and is blown into the annular channel formed between the bottom 8 and the conical shell 7, the cylindrical shell 3 and the outer glass 4 and enters the nozzles 9. The mixed gas flowing through the nozzles 9 mixes with the main gas. The reaction of the interaction of the main and mixed gases in the layer above the catalyst (not shown).

 The gas duct is made of composite of the upper 5 and lower 6 glasses, telescopic interconnected, the upper end of which is fixed through ring II on the casing 2, and the lower one on the conical shell 7; provides intensive cooling of the bottom 8 and the cylindrical shell 3 with mixed gas.

 The bottom 8 is made spherical, which improves its thermal regime due to the exclusion of separation zones when it flows around the streams, and also simplifies the manufacturing technology of the bottom in the cast version and allows it to be manufactured by other methods, for example, stamping.

 The nozzles 9 are fixed on the bottom 8 by means of a detachable connection.

 These changes in the design of the mixer do not affect the processes occurring in the reaction zone, since all external contours of the mixer and the gas-dynamic flow pattern under the bottom remain unchanged.

Claims (1)

 A methane converter mixer comprising a cylindrical body with a bottom, a device for forming a flow of one of the gaseous media to be mixed, equipped with a central gas duct made up of upper and lower glasses telescopically connected to each other, an inlet pipe located opposite the bottom, characterized in that the flow forming device one of the mixed gaseous media contains a conical shell with a glass, a cylindrical shell with a bell, forming between themselves and the bottom of the ring th channel nozzles for supplying gaseous media to be mixed in a mixing zone, a fixed bottom and communicated with a pipe through an annular channel, the central gazovod connected to the inlet and the bottom of the annular channel, and the bottom is made spheroconical.