SE441150B - PROCEDURE FOR WATER EXHAUST FROM COMBUSTION PLANTS AT THE SAME TIME DISPOSING NITROGEN OXIDES AND SULFUR OXIDES UNDER ADDITION OF AMMONIA - Google Patents

Description

lysen not sold "*" enen @ The invention is based on the information provided a process in which nan works with an overdose of ammonia to remove the HOX and remove the excess ammonia from the remaining the gases at no extra cost, The task is solved by the exhaust gases together with the procedure the whole anonyx additive is first added to a first process step, which removes HDX, and which is of a s'ag, where an excess of ammonia in addition to the consumption in the prooes step leads to increased reaction rate in the proees stage, and that the exhaust gases after the treatment in the first the prooes step is added together with unused ammonia to a second process step, which in the presence of ammonia removes sulfur oxides, wherein said whole ammonia additive is set to correspond to the total consumption in both prooesstegene Accordingly, the present invention is based on the idea that one combines an arbitrary with NH; working procedure to remove HDX with a flue gas desulphurisation procedure - for example according to German Patent Specification 24 31 130. This previously known desulphurisation The process works by adding gaseous ammonia, wherein Annonium sulphate is prepared from the sulfur oxides. According to the invention the amount of ammonia required for this was placed in one place - seen in direction of the gas flow - which is before the start of the NOx The amount of ammonia required for KO removal is increased accordingly. according to the invention to the amount needed for the reaction with SOX present in the flue gas during the subsequent desulphurisation This achieves the above advantages in terms of weight settingø For NOK removal, any procedure can be used where ammonia is worked down and where at the end of the process equilibrium the position between ammonia and H03 (respectively other components) affects the the degree of capture of HDX; then an excess of ammonia is advantageous as it leads to a significant increase in the reaction rate. thereby achieving lower investment costs or less extensive ones anpar luck, or at the same size of the anparatur a higher degree of NOK removal For a distance, FOï, one can use catalytic production processes, or adsorption = and absorption processes, exposed that these work with ammonia additive.

The combination according to the invention has the advantage that the degree of NOX removal is favorably affected without excessively high amounts

Claims (1)

vso9vzs ~ a ammonia escapes through the fireplace chimney. The combination process according to the invention is based on a plant arranged for desulphurisation under ammonia addition at which the effluent purge gas has only such a low content of ammonia that it is below permissible limits and the environmental requirements are thus satisfied. Such a process is described in DE-PS 24 31 130. The reaction carried out by means of the combination according to the invention can proceed, for example, according to the following chemical reaction: 2110 + 2NH 3 + 1/2 O 2 <--- 9 3H 2 O + 2N 2 As a result of the measures according to The invention also provides the economically advantageous effect that the NOX removal plant can be built with smaller dimensions than previously known plants, since a higher proportion of ammonia upon entering the system advantageously affects the reaction which removes the NOX contaminant. Claim: Process for the simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases from combustion plants with the addition of ammonia, characterized in that the exhaust gases together with the entire ammonia additive of the process are first fed to a first process stage, which removes NOX, and which is of one kind, ammonia in addition to the consumption in the process step leads to an increased reaction rate in the process step, and that the exhaust gases after the treatment in the first process step are carried to the unused ammonia to a second process step, sonw in the presence of ammonia removes sulfur oxides to which the said whole in both process steps.