US1581511A - Method of utilizing waste heat from gas - Google Patents

Description

April- 20, 1926. 1,581,511

H. CLEMM ET AL METHOD OF UTI LIZING WASTE HEAT FROM GAS Filed April 5, 1922 /n vent-bra Patented Apr. 20, 1926.

UNITED STATES PATENT OFFICE.

HANS'CLEMM, OF MANNHEIM-WALDHOF, AND ADOLF SCHNEIDER, OF KEHLHEIM,

V GERMANY, ASSIGNORS TO ZELLSTOFFFABRIK WALDHOF, OF MANNHEIM, WALD- HOF, GERMANY, A CORPORATION OF GERMANY.

METHOD OF UTILIZING WASTE HEAT FROM GAS.

Application filed April 3, 1922. Serial No. 549490.

To all whom itimay concern:

Be it known that we, HANS CLEMM and Anoiir SCHNEIDER, citizens of'Germany, residing, respectively, at Mannheim-lValdhof and Kehlheim, Germany, have invented certainnew and useful Improvements in Methods of Utilizing VVa'ste Heat from Gas ,and we do herebydeclare the following to be a full, clear, and exact description of the in vention, such as will enable others skilled in the art to which it appertains to make and use thesame. v

Our invention relates to improvements in methods of regenerating waste'heat of the gases coming out of sulphur-kilns, pyritekilns or other furnaces. There it is necessary to cool the gases which are coming from combustion and similar apparatuses, ordinarily cooling water is sprinkled over the pipes or other heat exchang ng members of a cooling system traversed by the gas to be cooled, and the major part of the heat taken.

up by the water is wasted. In addition, means must be provided for cooling the heated water before it can be used again.

The object of the improvements is to provide a method of cooling gases generated in sulphur-kilns or the like, by means of which the waste heat of these gases is regenerated. With this object in view, our invention consists in cooling the hot gases by means of fresh sulfit lye, and using the said heated sulfit lye, if necessary after further heating the same, for boiling the cellulose. In the practice of the invention, the cooling apparatus is traversed by the hot gases, such for example as gases from iron pyrite furnaces, and it is brought in contact with the fresh lye, such as sulfit lye, which is forced under pressure through closed cooling chambers provided in the apparatus. Thereby, any loss or noxious change of sulphurous acid by heating the lye, is avoided. The heated lye is directly supplied to the boiling apparatus filled with wood or it is first furthere within a. suitable apparatus.

For the purpose of explaining the method according to the invention, an example embodying a device for exercising the same is shown in the accompanying drawing, in which the same reference characters have been used to indicate corresponding parts.

In the example shown in the drawing, a designates a sulphur-kiln or pyrite-kiln, the gases of which are forced under pressure through cooling pipes 0, arranged in a lye pressure receptacle h by means of a pump or ventilator I).

The gaseous S0 cooled in the cooling pipes c, is led through the pipe d into the lye-tower e. In this tower, the S0 is converted into sulfit lye, which is pressed into the receptacle 'k by means of a pump 7. For instance, the lye may be introduced into the gas-steam-room of the closed pressure receptacle h by means of an atomizer g or immediately into the lye, contained in the receptacle.

Accordingly, the lye is heated in the receptacle h under pressure. Simultaneously, the hot SO coming out of the sulphur-kiln a is profitably cooled. Till now, there was used water for this cooling of the hot S0 whereby a great loss of water and warmth was caused, which is avoided according to applicants invention. The hot lye which is under pressure may be pumped by means of a pump Z'through a pipe k and a pipe m into the boiler n. The pipe 21 serves for leading olfthe condensing products.

What we claim is:

The herein-described method of regenerating the waste heat of the gases coming out of sulphur-kilns, pyrite-kilns or other furnaces, which consists in transmitting the heat from the said gases to fresh sulfit lye in a heat-exchanging device through which the lye is forced under pressure, and then conveying said lye into an apparatus for boiling cellulose, all the system containing fresh lye heated or not being completely closed, thus retaining a certain pressure therein for avoiding any loss of S0 and any noxious change of the lye by heating it.

In testimony whereof we hereunto vafiix our signatures.

DR. HANS CLEMM. DR. ADOLF SCHNEIDER.

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