SU1493303A1 - Ammonia converter - Google Patents

Abstract

This invention relates to ammonia converter designs and can be used in the production of weak nitric acid. The goal is to increase the reliability of the ammonia converter design. The converter contains a vertical cylindrical body with a flanged connector, inside which is placed a platinum catalyst grid, a tubular tail gas preheater located under the grid with oppositely arranged vertical chambers equipped with branch pipes and tube plates to which heat exchanger tubes are connected, and one of the heater chambers is located in its upper parts and its nozzle installed coaxially tube plate, and the nozzle of the second chamber is placed coaxially nozzle of the first chamber, the body of the last sleep female shell with input stub tail gases, forming with the body a closed cavity, which communicates with one chamber pipe and another pipe is fixed in the shell. 2 Il.

Description

one

(21) 4325255 / 23-26

(22) 11/05/87

(46) 07.15.89. Bup. No. 26

(71) Scientific and Production Association TechEnergohimprom

(72) A.Ya.S. Vrikov and V.Ya.Kruglsky

(53) 66.023 (088.8)

(56) USSR Copyright Certificate No. 982777, cl. B 01 J 8/04, 1981.

USSR Author's Certificate No. 1178476, cl. On 01 J 8/04, 1984.

(54) AMMNARSA CONVERTER

(57) The invention relates to ammonia converter constructs and can be used in the production of weak nitric acid. The goal is to increase the reliability of the ammonia converter design. The converter contains a vertical cylindrical case with a flange connector, inside which is placed a platinum catalyst grid, a tubular tail gas preheater with opposing vertical chambers, equipped with branch pipes and tube plates, to which heat exchange pipes are connected, is located under the grid. chambers of the preheater is located in its upper part and its nozzle is installed coaxially with the tube plate, and the nozzle of the second chamber is placed coaxially with the nozzle of the first chamber, days shell provided with a nipple input tail gases, forming with the body a closed cavity, which communicates with one chamber pipe and another pipe is fixed in the shell. 2 Il.

(L

This invention relates to the design of ammonia converters and can be used in the production of weak nitric acid.

The aim of the invention is to increase reliability.

FIG. 1 schematically shows an ammonia converter, a longitudinal section; in fig. 2 - section A-Anafig.1.

The ammonia converter contains a vertical cylindrical body 1 with nozzles 2 and 3 for supplying ammonia-air mixture and removal of nitrous gases and a flange connector 4. Inside the body 1 on the supporting elements 5 there is a platinum catalyst grid 6, under which

a tubular heater 7 tail gas with the oppositely arranged first 8 and second 9 vertical chambers, equipped respectively with nozzles 10, 11 for supply and removal of tail gases and tube plates 12, 13, to which the heat exchange tubes 14 are connected.

The first chamber 8 is located in the upper part of the preheater 7, and its nipple 10 is installed coaxially with the tube plate 12. The tube plate 13 of the second chamber 9 is located in the lower part of the preheater, and its nozzle 11 is coaxially positioned with the nozzle Y. 8 preheater 7

four

CO SO

with about with

provided with a shell 15 with a fitting 16, formed with a housing 1, a closed cavity 17, with which a branch pipe 10 communicates. A branch pipe 11 of the second box: measures 9 is fixed in the shell.

The ammonia converter works as follows.

ANHj +

50g

4NH3 + 40t: ;; 2NjO

The converted nitrous gas with a temperature of 850-950 seconds passes 7 tail gases to the preheater, where nitrogen oxides are fixed due to the rapid cooling of the gas. Cooled to 460-500 0 nitrous gas through the nozzle 3 is removed for further processing.

Tail nitrous gases from the absorption column with a pressure of 6.5 to 7.5 kgf / cm at lOO-UO C are introduced through the fitting 16 into the cavity 17 and through the nozzle 10 into the first chamber 8. From the chamber 8, the tail gases enter the heat exchange tubes 14, where they heat the heat of nitrous gases, they pass through the second chamber 9 and are removed from the converter to the gas turbine at ZOO-BOO C.

Making the nozzles 10 and 11 with axes allows eliminating the voltages from the temperature transients of the heater 7, which increases the reliability of the device. The conversion of the converter with an outer shell 15 having a fitting 16 for supplying tail gases, due to the flow of cold tail gases through the cavity 17, cools the upper part of the body t at the point of exit of tail gases and equalizes the temperature of cortex 1493303.

The ammonia-air mixture under pressure of 6-8 kgf / cm through pipe 2 enters the upper part of housing 1 and passes through the catalyst grid 6, where, at OZO – EZO C, ammonia is converted by the following reactions;

4NO + 6HjO + 216.7 kcal;

About “263.9 kcal.

in front of the flange connector 4, which reduces the thermal stresses in the housing and eliminates distortions in the flange connector, increasing reliability.

Claims (1)

Invention Formula An ammonia converter containing a vertical cylindrical body with a flange connector, inside which is placed a platinum catalyst grid, a tubular tail gas preheater with opposing vertical chambers equipped with nozzles and tube plates located in the upper and lower parts to which are connected are located under the grid. heat exchange tubes, the first chamber of the preheater is located in its upper part and its nozzle is installed coaxially with the tube plate, characterized in that, for the purpose of povt1eni reliability, the second pipe, chamber is arranged coaxially with the nozzle of the first chamber, the housing in the zone of the latter arrangement is provided with input shell fitting tail gases, forming with the housing a closed cavity, with which the pipe of the first chamber communicates, and the pipe of the second chamber is fixed in the shell. XBocmoStiut output Nitro yield} Hb x gases FIG. one 12 Outlet, gazob eleven