SU1238780A1 - Method of cleaning flue gases from nitrogen oxides - Google Patents

Description

2. A method according to claim 1, characterized in that the process is carried out at a flue gas temperature at the exit of the radiation portion of the furnace equal to

zo-ebo with.

3. Method according to paragraphs. 1 and 2, which is based on the fact that

This invention relates to methods for lowering nitrogen oxides in fumes and may be used in ammonia energy technology installations.

The purpose of the invention is to reduce the residual concentration of nitrogen oxides in smoke gases.

The drawing shows a diagram explaining the method.

The diagram shows the reforming tube furnace 1, flame region 2, radiation part 3 of the reforming tube furnace, reaction tubes 4, ceiling burners 5, probes 6, tunnel burners 7, and flue gas extraction tunnels 8.

Example 1. A tank gas in the amount of 500 with an ammonia concentration of 2.0 vol.% And a purge gas in the amount of 5000 with an ammonia concentration of 1.0 vol.% Is mixed with natural gas. The resulting fuel gas in an amount of 30,000 with an ammonia concentration of 0.2 vol.% Is burned in the ceiling burners of the tube furnace. The data obtained in the temperature zones of the tube furnace are given in table. one.

The concentration of nitrogen oxides in the total flue gas stream is 75.0 mg / m.

Example 2. Purge gas in the amount of 5000 with an ammonia concentration of 1.0 vol.% Is mixed with

20

thirty

35

25,000 nm / h of natural gas and tank gases containing 2-3 vol% ammonia are burned in the ceiling burners of tubular gas.

4. The method according to paragraphs. 1-3, about t of l and-. due to the fact that the concentration of ammonia in the combustible gases is maintained at 0.1-0.2% by volume.

ovens. Tank gas in the amount of 500 mm / h with a concentration of 2-3 vol.% Is introduced through special probes into the end of the flame of each ceiling burner only in those zones in which the temperature in the flue gas removal tunnels from the radiation part of the tube furnace is 950-960 WITH.

The data obtained in those sheriury zones of the tube furnace, at a concentration of Sd In the fuel gases of 0.1–0.2% by volume, is given in Table. 2

The concentration of nitrogen oxides in the total flue gas stream is 43.7 mg / ms.

T a b l Ci a 1

, 1000 1045

Editor M.Blanar

Order 3322/2 Circulation 663 Subscription

VNISh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

. Production and printing company, Uzhgorod, Projecto st., 4

table 2

33.3 33.3 34.9 34.9

Compiled by G.Vinokurova

Tehred L.Oleynik Proofreader A.ZimokosoE

Claims (4)

1. THE METHOD FOR CLEANING NITROGEN OXIDES OF SMOKE GASES obtained by burning natural gas in tube reforming furnaces by co-burning natural gas and purge and tank gases from ammonia production is distinguished by the fact that, in order to reduce the residual concentration of nitrogen oxides in flue gases tank gases are fed to the end of the flame of the ceiling burners of tube furnaces using probes. SU. „. 1238780 1238780, 2. The method of pop. 1, characterized in that the process is conducted at a temperature of flue gases at the outlet of the radiation part of the furnace equal to 950-960 ° C. 3. The method according to PP. 1 and 2, characterized in that tank gases containing 2-3 vol.% Ammonia are used. 4. The method according to PP. 1-3, with the fact that the concentration of ¹ ammonia in the combusted gases is maintained equal to 0.1-0.2 vol.%.