Abstract The invention relates to a process and a device for flue gas desulphurization using the following reaction: SO.sub.2 +Br.sub.2 +2 H.sub.2 O→H.sub.2 SO.sub.4 +2 HBr The hydrobromic acid thus formed is split up by electrolysis into hydrogen and bromine. The sulphuric acid thus produced is brought to a saleable concentration rate of at least 90% in two successive concentrators (1, 2), the post-concentrator being fed with high temperature flue gases which are withdrawn immediately behind the economizer of the power plant. A partial flow of the flue gases to be cleaned traverses a heat exchanger (6), in which the cleaned flue gases are reheated to a temperature level which is compatible with the chimney requirements.
A process for flue gas desulphurization comprising the steps of: (A) converting sulphur dioxide and an aqueous bromine solution, in a reactor traversed by flue gases, into sulphuric acid and hydrobromic acid; (B) separating the sulphuric acid from the hydrobromic acid by evaporation in a first concentrator through which the flue gases flow; (C) subjecting the sulphuric acid obtained to further evaporation in a second concentrator which is traversed by gases having a temperature which is essentially higher than that of the flue gases; and (D) subjecting the hydrobromic acid obtained to electrolysis to form hydrogen and bromine, wherein the bromine can be reinjected into the reactor.
Claim 2
Dependent Claim
107 words
A process for flue gas desulphurization comprising the steps of: (A) converting sulphur dioxide and an aqueous bromine solution, in a reactor traversed by flue gases, into sulphuric acid and hydrobromic acid; (B) separating the sulphuric acid from the hydrobromic acid by evaporation in a first concentrator through which the flue gases flow; (C) subjecting the sulphuric acid obtained to further evaporation in a second concentrator which is traversed by gases having a temperature which is essentially higher than that of the flue gases; and (D) subjecting the hydrobromic acid obtained to electrolysis to form hydrogen and bromine, wherein the bromine can be reinjected into the reactor.
Claim 3
Dependent Claim
18 words
The process according to claim 1, wherein the temperature of said gases is between 250° and 400° C.
Claim 4
Dependent Claim
36 words
The process according to claim 1 or 2, wherein said gases are also flue gases, which, after flowing through the second concentrator, are fed into the flow of the flue gases which are to be cleaned.