Method of recovering heat and sulfur compounds from hot gaseous products of combustion

Claim 1

THE METHOD OF RECOVERING HEAT AND SULPHUR COMPOUNDS FROM THE PRODUCTS OF COMBUSTION OF FUELS CONTAINING CORROSIVE CONSTITUENTS PRODUCING GASES INCLUDING SULPHUR COMPOUNDS SUCH AS SO2 WHICH COMPRISES; ABSORBING HEAT FROM SAID GASES BY HEAT EXCHANGE SURFACES OF A MATERIAL NORMALLY ATTACKED BY CORROSIVE SUBSTANCES SO AS TO REDUCE THE TEMPERATURE OF THE GASES TO A POINT CONSIDERABLY BELOW THEIR DEWPOINT AND THEREBY CAUSE CONDENSATION ON SAID SURFACES OF MOISTURE FROM SAID GASES IN THE PRESENCE OF SAID SULFUR COMPOUNDS; WASHING SAID SURFACES WITH NONCORROSIVE SOLUTION OF SULFURIC ACID OF A CONCENTRATION OF APPROXIMATELY 70% IN ORDER TO CARRY OFF SAID CONDENSED MOISTURE AND SO2; RECOVERING SAID ACID AND CONDENSED MOISTURE; PURIFYING THE ACID WASH LIQUID TO OBTAIN ACID FOR REUSE; AND RECYCLING PART OF THE RECLAIMED ACID TO WASH SAID SURFACES.