DE1619881C - Process for the desulfurization of indu stneab gases - Google Patents

Claims (1)

• 1 '... 2 ■ The invention relates to a method for sion by means of a fan 32 together with the Desulfurization of industrial exhaust gases, in which the exhaust gases, which through the line 13 into the line gases enter for the purpose of adsorption of the sulfur contained therein, after their flow velocity feloxyde brought into contact with activated charcoal was regulated by a damper 14, in a and the activated carbon after adsorption for the purpose of 5 adsorption zone 15 a in this device. Removal of sulfur oxides and regeneration The flow rates of the through the the activated carbon rinsed with water and dried lines 10 and 13 flowing exhaust gases is and again the adsorption of the sulfur oxides by the damper 14 according to the operating serves. state of the adsorption-desorption device 15 Such a method is e.g. B. regulated from the German io. Auslegeschrift 1 193 019 known. It goes there- The exhaust gases leaving the adsorption zone 15 a, at the same time sulfur oxides and reducing oxides, now that the sulfurous anhydride-sulfur compounds have been removed from the exhaust gases, and the sulfuric anhydride gas has been removed therefrom by adding a certain sulfur molar ratio between the sorption effect of the activated carbon, see the oxides and the other connections 15 passed through lines 17 and 8 and is disclosed by one. In the last stage of the desulphurisation chimney 31 released into the atmosphere,
The activated carbon is present in a flushing desorption zone 15 c sulfur in the form of sulfur dioxide and is flushed in the device with water, which is then discharged from the desulfurization system. is fed from above this zone. The rinsing The invention is based on the object that the water used is 20 ment of activated carbon by Method of the type mentioned so auszubil- a line 18 in a sub-tank 19 a in one denotes that the adsorption of the exhaust gases ent- water tank 19 is supplied to be stored therein held sulfur oxides are inten- by the activated carbon, and by means of a pump 21 through a line is sivated. tung20 pumped up. The resulting washing This object is inventively be water-overall 25 through a line 22 into a lower Triggers that one tank b out 19 and stored in the sub-tank, drying the water-rinsed activated carbon with a part of the exhaust gases, this part of the functions of said zones In the ad-exhaust gases after the drying step with the residual sorption-desorption device, the exhaust gases are mixed in and this mixture is changed at the correct time intervals, so that a regenerated activated carbon comes into contact and 30 working cycle, consisting of adsorption, flushing-desorption Steps repeated periodically. and drying exists, at the same time repeatedly In this way of working, the is distributed by the. Use the washings stored in the sub-tank 196 to dry the purged activated carbon Part of the exhaust gases absorbed moisture at water are through a line 27 in a concentrate Mixture with the remaining part of the exhaust gases 35 is carried out to the tration tank 23, in which they are by direct Erauf the entire mixture, and vice versa, heat is concentrated by means of a burner 24 of the latter when mixed with the former, and the dilute sulfuric acid thus produced Part delivered. As a result, there is sulfuric acid contact through a conduit 28 derived from the mixture of the exhaust gases with the adsorptive or ammonium sulphate production plant, tionable activated carbon a very good gas diffusion 40 The reference number 25 denotes a fuel delivery and a very high level of sulfur oxide adsorption conduit and the reference digits 26 an air conveying conduit the activated carbon. tion. The combustion gases from the burner 24 are The invention is carried out on the basis of the only one through the line 29 into the line 16 to Figure illustrated embodiment in more detail to enter the adsorption zone 15a while a explained. 45 part of it through a line 30 for the purpose of preheating According to the figure, the exhaust gases flow from a tongue of the rinsing water in the sub-tank 19 a diverted Steam boiler 1 through a line 2, an air supply. heater 3 and a line 6 in a dust collector 7, the reference numerals 39 and 43 denote changeover in which they are freed from dust. The the valves in the line 22 and a line 40 Dust collector 7 leaving exhaust gases flow through 5 ° are provided. Line 40 is off line a line 10 and after compression by means of a 22 branched off to remove the washing water from the rinsing Fan 11 in a drying zone 156 in a desorption zone 15 c in a neutralization tank 41 Adsorption-desorption device 15, in which direct if and at a time where the concentration they serve to dry activated charcoal, which in- stallation device as a result of a malfunction or follow the rinse in the previous rinse and 55 increase the amount of washing water to one Desorbing operation became damp. A larger scope is required than from the concentration facility. Part of the exhaust gases diverted to be processed through a pipe device becomes incapacitated. 13 to flow to an adsorption zone 15 a in The washing introduced into the neutralization tank the device leads. water with an alkali contained therein The b entering the drying zone 15 exhaust connection 60 and neutralized after neutralization gases dry the moist activated carbon, as indicated, discarded through an outlet opening 42, but at the same time part of the contained therein. The figure also shows one of the line 2 Sulfurous anhydride through the activated carbon ad- branched off exhaust gas circulation line 4 with fan 5, sorbed, so that when leaving this zone it leads to the steam boiler 1, reduced sulfuric anhydride content and 65 _ have an increased water content. Claim: The exhaust gases leaving the drying zone ISb process for the desulfurization of industrial streams through a line 16 and after compressed exhaust gases, in which the exhaust gases are used for adsorption the sulfur oxides contained therein are brought into contact with activated carbon and the Activated carbon after adsorption for the purpose of removing the sulfur oxides and regenerating the Activated charcoal is rinsed with water and dried and again the adsorption of the sulfur oxides serves, characterized in that the activated carbon rinsed with water is used. part of the exhaust dries, this part of the Exhaust gases after the drying step mixes with the remaining part of the exhaust gases and this mixture brings into contact with the regenerated activated carbon and repeats these steps periodically. 1 sheet of drawings