DE8619614U1 - Device for the production of nitric acid - Google Patents

Description

ί!

ti · ι

c ι ιΤϊ

CC Il i

G ce ι

c c

Andrejewski, Honke & Partner, patent attorneys in Essen

3 ^

description

The invention relates to an apparatus for producing nitric acid by catalytic combustion of ammonia with air, consisting of a reactor with an upper gas inlet connection and a lower gas discharge connection and a waste heat boiler located under platinum-rhodium catalyst gauzes, the waste heat boiler being made up of several stacked heaters Cooling pipe layers and each cooling pipe layer is composed of several cooling pipe sections, each with its own supply section are connected to a common distributor pipe and to a common collector pipe via a separate discharge section, and into the end of each feed section connected to the manifold a La Mont nozzle is screwed in and the manifold pipe opposite these ends, each with a nozzle handling attachment is provided.

With known from practice, not documented in detail Devices of the type mentioned can leakage in individual cooling pipe sections cannot be localized due to the lack of accessibility of the cooling pipe layers. If leaks occur, you are therefore forced to disassemble the waste heat boiler into the individual cooling pipe layers, which is very expensive because every time all supply and Drainage sections must be separated and welded together again after the leakage has been eliminated.

The invention is based on the object in a device of To find a structure mentioned at the beginning, which enables a localization and shutdown of a leaking cooling pipe section without dismantling the device or the waste heat boiler.

If IIII it M

Il I I. .

I I I I I t 1 1

Il Il ■ · Il I

I I -I I

AndVefewski, Honke & Partner, patent attorneys in Essen

The inventive solution to this problem is that the The collector pipe is provided with a manipulation attachment in the extension of the assigned ends of the discharge sections,

In other words, in the case of a safety device, the an = Order around the header pipe in the same way as that around the manifold pipe built up, apart from the La-Mont ^ nozzles. In the event of a leak, the nozzle handling approaches now allow an Ab ^ press each cooling pipe section shut without the device or the waste heat boiler having to be disassembled. In the course of the The leaking cooling duct section can be easily determined by pressing and close by screwing in a plug instead of the La Mont nozzle; the assigned end can accordingly of the discharge section of the relevant cooling pipe section, in soft a thread for pushing through the manipulation attachment has been cut, also screw in a sealing plug. In this way, an immediate repair is possible with longer downtime of the device is not required.

For the further development there are several within the scope of the invention Options. The manipulation approaches preferably consist of closed radial connectors. Is used with a particularly high coolant pressure worked, you will close these radial connections by welding. In all other cases, the radial supports can easily be closed by a screwed-on cap. An accelerated one Localization of a leaking cooling pipe section is given if, as in the preferred embodiment, the distributor pipe and, accordingly, also the collector pipe, in particular as welded ones Partitions made partitions in at least one cooling pipe each pipe parts with separate continuation connections underneath

Andrejewski, Honke & Partner, patent attorneys in Essen

are divided; this can namely in advance via the Weiterfuhrüngsanverbindungen an impression of groups comprising at least one cooling pipe layer be carried out by cooling pipe sections.

In the following the invention is based on an exemplary embodiment Illustrative drawing explained in more detail. Show it

Fig. 1 is a schematic longitudinal section through a device for Manufacture of nitric acid,

2 shows, in an enlarged representation, a section through the distributor pipe, and

3 shows an enlarged illustration of a section through the collector pipe.

The device shown in the figures is used to produce. Nitric acid by catalytic combustion of ammonia with air and consists of a reactor with upper gas supply supports 1, lower Gaa drainage nozzle 2 and under platinum-rhodium catalyst gauzes 3 located waste heat boiler 4. The preheated ammonia-air mixture is on the platinum-rhodium catalyst gauzes 3 to nitrogen monoxide and burned water. The reaction is exothermic and the resulting heat must be quickly removed in the waste heat boiler, since the nitrogen monoxide otherwise it breaks down into nitrogen and oxygen.

For this purpose, the waste heat boiler is made up of several close together arranged cooling pipe layers 5 and each cooling pipe layer 5 composed of several cooling pipe sections (not visible in Fig. 1), each via its own feed section 6 to a common distributor pipe

J , -

I I

I I

Andrejewski, Horike & Partner, patent attorneys in Essen

and are connected to a common collector pipe 9 via their own discharge section 8. For reasons of heat balance, the number of cooling tube sections decreases with the distance from the flatin rhodium catalyst gauzes 3. How to be screwed into the device connected to the manifold 7 the end of each supply portion 6 is a La-Mont nozzle 10 from FIGS. 1 and 2 readily recognize _Ä. As is known, such La Mont nozzles 10 consist of throttles 11 which, due to their flow resistance, ensure an even distribution of the coolant to all pipes; the throttle 11 is in each case combined with an upstream sieve 111 in order to keep contaminants away from the throttle 11. The distributor pipe 6 is provided opposite the ends equipped with the La-Mont nozzles 10, each with a normally closed nozzle handling attachment 12. Correspondingly, the collector pipe 9 is provided with a manipulation attachment 13 in each case in the extension of the assigned ends of the discharge sections 8 (cf. FIG. 3). As can be seen from FIGS. 2 and 3, the nozzle handling attachments 12 and the manipulation attachments 13 consist of welded-on radial connectors 14 which are closed by a screwed-on cap 15. At higher coolant pressures, the closure caps 15 will also be welded.

If a leak is found, the nozzle handling tabs 12 and the associated manipulation approaches 13 opened one after the other. The respective La Mont nozzle IG is unscrewed and inserted into the dem Manipulation approach 13 opposite end of the discharge section 8 screwed a corresponding thread. Now you can go through the respective nozzle handling approach 12 and the associated manipulation approach 13 tubes 16 are screwed in, which is indicated by dashed lines in FIG. 3; in this way it is then possible to

III tt ·. II ί I C ι. ι

Andrejewski, Honke & Partner, patent attorneys in Essen

borrowed. If the leaking cooling pipe section is found, appropriate Sealing plug screwed in, so that the cooling pipe section in question is shut down and the device can continue to be used will.

A variant in which the Distributor pipe 7 and correspondingly also the collector pipe 9 by separations in at least one cooling pipe layer each grasping pipe parts are subdivided with separate continuation connections for the coolant supply and discharge.

II t III (I (III I

Claims (4)

Utility model registration of the company Oschatz GmbH Westendhcf 10-12 4300 Essen 1 device for the production of nitric acid Protection claims: 1. Apparatus for producing nitric acid by catalytic Combustion of ammonia with air, consisting of a reactor with an upper gas supply nozzle, a lower gas discharge nozzle and under a platinum-rhodium catalyst mesh located waste heat boiler, whereby the waste heat boiler consists of several cooling pipe layers arranged one above the other and "each cooling pipe layer is made up of several cooling pipe sections, which are each connected to a common distributor pipe via their own supply section and to a common collecting pipe via their own discharge section, and in which the I I lit Andrejewski, Honke & Partner, patent attorneys in Essen Manifold connected end of each feed section one La Mont nozzle is screwed in and the manifold is provided opposite these ends with a nozzle handling attachment is, characterized in that the collector pipe (9) in the extension of the associated ends of the line sections (8) is each provided with a manipulation attachment (13). 2. Apparatus according to claim I _1, characterized in that the manipulation lugs (13) consist of closed radial connectors (14). 3. Apparatus according to claim 2, characterized in that the radial connector (14) by a screwed-on cap (15) are locked. 4. Device according to one of claims 1 to 3, characterized in that that the distributor pipe (7) and correspondingly also the collector pipe (9) by separations in at least one cooling pipe layer each (5) Detecting pipe parts with separate continuation connections are divided. • 4 «4 4« • # ■ • 4 ·