DE1545445B - Process for the production of town or long-distance gas. Eliminated from: 1259298 - Google Patents

Description

The amount of catalyst was ^{250 kg for 300 m 3} / h. The catalyst was brought to the temperature of 250 ^° C. by the flowing gas. A slight excess of ammonia was metered in from gas bottles upstream of the reactor inlet. The gas leaving the reactor was washed directly in a downstream cooler and measured with a rotary piston meter. By removing the nitrogen oxides, this gas could be used directly as a mixed component for town gas. The average composition of the flue gas used was as follows:

CO, IO ₂ IN ₂
Volume percentage

6.0

8.0

86.0

SO ₂

mg / m ³

500

NO

ml / m ³

120

NO ₂

ml / m ' ⁵ '

15th

After passing through the reactor, the main components of the flue gas had hardly changed, but the nitrogen oxide content was below 0.01 ml / m ³ . Excess ammonia was completely burned off, ίο H ₂ S and HCN from ammonia water could no longer be detected.

Claims (1)

1 2 Contain sulfur oxides. The known procedure Patent claims · cannot lead to success because it does not take into account the moisture content of the gas. 1. Process for the manufacture of urban or 5 Furthermore is from the British patent Ferngas, characterized in 883 946 a method known in which nitrogen oxides that in place of generator, water and gout. with ammonia on metal-containing catalysts of the gas platinum group is used as a mixed component flue gas, even in the presence of free acid, the nitrogen oxides can be reduced to nitrogen by reducing the substance. The used However, the same as nitrogen at an elevated temperature with io catalysts are very expensive and will be by means of ammonia or by means of such compounds, experience has shown that it is quickly poisoned by sulfur, so those under the. applied reduction conditions - that they are only used for the treatment of sulfur-free gases, splitting off gen ammonia, but not in the presence of flue gas, can be used. Catalyst made of iron and chromium oxides from German Auslegeschrift 1115 230 is is removed. 15 also a method for reducing nitrogen 2. The method according to claim 1, characterized in that, in the pretreatment of the smoke, the presence of cobalt, nickel or iron as catalyst gas for removing the oxygen, the heater is known. The efficiency of the process is limited by the use of a built-in flue gas. The residual nitrogen oxide content of the burner is carried out. 20 treated gas after the reduction is at best at 1.3 ° / _0th The invention is based on the object of producing a largely detoxified city or long-distance gas. This object is achieved in that in place 35 of generator, water and furnace gas as a mixed component Flue gas is used from the nitrogen oxides by reducing them to nitrogen at elevated temperature by means of ammonia or The invention relates to a process for the preparation by means of such compounds which are from town or long-distance gas. 30 applied reduction conditions ammonia splitting off Gas generation systems only deliver in rare cases, in the presence of an iron and catalyst a gas that meets the quality requirements for chromium oxides. public gas supply (see DVGW worksheet The oxygen content of the flue gas is G 260) immediately corresponds. In addition to reprocessing, it is liable to be broken down by the fact that the a mixture of so-called strong- 35 lytic nitrogen oxide removal is generally required temperature gases (e.g. coke oven gas, refinery residual gas, natural gas) by heating the flue gas with the help of a and so-called lean gases. As a built-in burner is obtained. Lean gases have so far been the strong carbon oxide The flue gas is freed from dust and mists, containing, i.e. poisonous, components of generator gas, If the moisture content is high, it is advisable to Water gas or furnace gas used. Condense flue gas additive 40 water by cooling. That so was previously impossible because once the pretreated gas is removed it is heated up again and un- Nitrogen oxides were not economically justifiable, for indirectly before entering the catalyst with ammonia other concerns about the oxygen content of the nia, or it gets cold, mixed with ammonia Flue gas passed. - puts, in a heated reactor, which the catalyst In the magazine gwf - Gas.- und Wasserfach, 45 contains. The ammonia k'anital gas or as am- 101st year, 1960, will be entered on p. 102 to 106, monia water concentrate. The other 152 to 156 and 261 to 263 on the breakdown of their reaction components of ammonia water, Nitrogen oxides in the treatment of coke oven gas such as H ₂ S, HCN, do not interfere with NO breakdown, reported. The stick can then be removed. The reaction temperatures are dry oxides up to a residual content of 0.2 cm ³ / Nm ³ ; jm so starting gas in the range from 150 to 300 ⁰ C, preferably treated gas. On p. 261 f. The above _: usually at around 250 ° C. With very humid gases However, it is stated that above 300 ° C. good results are obtained. Subsequently in the presence of nitrogen oxides in the coal gas can be cooled directly, with impurities, Resins can form which can interfere with regulators, such as B. SO ₂ , can be removed under certain circumstances Valves and the like lead, whereby the resin formation by 55 NEN.
oxygen present in the gas is favored. the Nitrogen oxide content of flue gases must therefore because of example
Their comparatively high oxygen content can be considerably further reduced if the flue gases In a test facility, 300 m ³ / h flue gas were successfully implemented as a lean gas component for urban 60. The gas was intended to be used by direct scrubbing or remote gas. Dust and excess water vapor removed. The flue gas from German patent specification 906 606 was then heated and passed into a reactor for the removal of organic sulfur, in which a chromium and iron oxide compound from gases was known, in which the catalyst was simultaneously stored on sieve plates. The cata also nitrogen oxides are broken down. ' The process consisted of 85% Fe (III) oxide, 10% Cr (III) - the efficiency of which is not otherwise described, oxide, 2% Cr (VI) oxide and admixtures of leaves however, do not apply to smoke gases containing silica, alkalis and alkaline earths. In addition to larger amounts of nitrogen oxide, the catalytic converter also had oxygen and tor was pressed in the form of cylindrical bodies.