US1471821A - Method of and system for utilizing heat - Google Patents

Description

@Qih 23, 1923.

I A. BESTA ET AL METHOD OFAND SYSTEM FOR UTILIZING HEAT Filed March 19. 1923 Patented Get. 233, i923,

UNHTElD @TATES lhlllhtzll PATENT QFFHCCEO annnamr BESTA arm msrrmrcn mania, or nonsense-nuances, shamans.

EETIBZQID AND SYSTEM FOR UTILIZING- HEAT.

Application filed march 1a, was. Serial no. eaaoao.

To all whom it may concern:

Be it known that we, AnALeEn'r Been, a citizen of Germany, residing at Duisburg- Ruhrort, in the State of Prussia, Germany,

0 and HnrNmorr LENT, a citizen of Germany, residing at Duisburg-Ruhro'rt, in the State of Prussia, Germany, have invented certain new and useful Improvements in the Methods of and Systems for Utilizing Heat; and

it) we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in the method of and system for utilizing heat. More particularly our invention relates to systems in which the ratio of the heat supplied by a source thereof and the demand at for heat varies, and in which the supply or the demand of heat or both vary during a certain period of time for example during a day, so that during a part of the day the supply of the heat exceeds the demand,

while during other arts it is insufficient to cover the demand. xamplcs of systems of this class are metallurgical plants in which the as from blast furnaces or other metallurgical furnaces is used for heating steam $10 boilers supplying steam to the engines or other consumers of the plant. As is known to those skilled in the art the supply of gas from blast furnaces varies in the course of a day within large limits, so that there is temporarily an excess of heat while at other times the supply is insuflicient. On the other hand the consumption of steam is irregular and it varies within large limits, and it happens that much'steam is required at a 40 time when the supply of gas is low, and vice versa. Economical running of the plant requires that the excess and deficiency of heat supplied and consumed are compensated, so that at no time is there a deficiency of as steam, and so that there is no waste of heat by allowing the gas to escape without being used for the purposes of the plant. Therefore, our invention consists in connecting a steam generating plant with a hot water heat accumulator, and connecting the gas supply with the generator as well as with the accumulator, the gas being supplied to both of said apparatuses if the supply thereof is large and exceeds that of the demand, while the gas supply to the accumulator is reduced or entirely interrupted, and the gas is conducted only to the boiler, when the supply of gas is reduced. When the gas is not sufficient to generate the amount of steam required in the plant the hot water from the accumulator is fed into the boiler.

in order that our invention be more clearly understood an example embodying the same has been shown in the accompanying drawing illustrating our improved system in a diagrammatical Way. In the example shown in the figure our improved system comprises a steam generator b of any known or preferred construction having burners Z connected with the supply of gas from a metallurgical furnace such as a blast furnace, and a superheater 7c. -Preferably the'fire box contains a checker work z'. The steam generator is connected with a hot water accumulator made in several sections a each-comprising two boilers havmg upper and lower boiler sections 0 and 0'. Within each of the lower boiler sections there are two fiues m containing suitable burners n and a checker work 0- for storing heat. The lower boiler sections 0 are connected by pipes 03, and they communicate with the water chamber of the steam generator I) through a pipe 6 including a feed water pump f. The domes g of the accumulator communicate with the steam generator and preferably with the superheater lc thereof through a pipe h. It will be understood by those skilled in the art that by reason of the communication between the domes g of the accumulator and the boiler, the same pressure at any moment obtains in said accumulator and said boiler.

The burners Z and n are connected with the gas supply by pipes p and g and amain 1', which pipes include valves 8 and t controlling the fuel supply to the individual accumulator sections and the boiler.

If the supply of gas from the blast furnace is high, the gas is burned in the boiler and in the accumulator, and the heat is used for generating steam in the boiler and heating the checker works 0 and 2' and the water within the accumulator. Upon a reduction of the as supply the burners n are successively s ut oil from the supply, and finally the whole volume of gas is burnt within the generator 6. Now the heat stored in the hot water of the accumulator a is transmitted to the boiler through the pipe 6, and as the level of the water within the accumulator falls ofi' the feed pump f is put into opera- I tion. Now the heat supplied to the boiler ter' into the boiler, the heat stored in the checker work 0 is sufficient to generate steam within the accumulator, which steam flows through pipe 7:. to the generator I) and more particularly to the superheater is there- The operation is similar if the consumption of steam varies. In case of a reduced consumption the heat which is not immediately necessary for generating steam is used for heating water within the accumulator, and the heat stored in the accumulator is afterwards transmitted to theboiler.

It will be understood that cold water is fed into the accumulator at or before the period of a high supply of heating gas. The level of the water in the accumulator may rise above that of the water in the generator, and at the time of a reduced gas supply the level within the accumulator may fall off far below that of the generator. Therefore there is a large volume of water for storing heat. The difiierence of the level of the water within the accumulator is not objectionable by reason of the feed pump f adapted to force the water i to the boiler when the level in the accumu ator is low, and to prevent non-regulated supply of water to the boiler when said level is high.

In the figures we have shown hand operated means 'for controlling the supply of gas to the burners, but we wish it to be understood that our invention is not limited to this feature.

While in describing theinvention referonce has been made to a particular apparatus which is suitable for putting the method into effect, we wish it to be understood that our invention is not limited to the construction of the apparatus shown in the drawing and that various changes may be made in the general arrangement of the apparatus and the construction of its parts without departing from our invention.

We claim:

1. In a system for utilizing waste heat a steam generator having a burner for heating same, a source of fluctuating combustible gas supply, valve controlled means for conducting gas from said source to said generator burner, an accumulator having a burner for storing up heat units from said gas supply when said supply exceeds the demands of said generator, valve controlled by-pass means for leading such excess gas from said source to said accumulator burner unmixed with the gas which has been burned in said generator burner, said accumulator comprising a water heater, and

means for delivering water from said aogas su ply when said supply exceeds the man s of said generator, valve controlled by-pass means for leading such excess gas from said source to said accumulator burner unmixed with the gas which has been burned in said generator burner, said accumulator comprising a water heater, and means for delivering water from said accumulator to said steam generator, said water delivery means including means for controlling the supply of water from said accumulator to said generator.

3. In a system for utilizing Waste heat a steam generator having a burner ior heating same, a source of fluctuating combustible gas supply, valve controlled means for conducting gas from said source to said generator burner, an accumulator having a burner for storing up heat units from said gas supply when said supply exceeds the demands of said generator, valve controlled by-pass means for leading such excess gas from said source to said accumulator burner unmixed with the gas which has-been burned in said generator burner, said accumulator comprising a water heater, and means for delivering water from said accumulator to said steam generator, said water delivery means including means for selectively forcing water from said accumulator to said generator and for preventin non-regulated supply ofwater from sai accumulator to said generator.

4. In a system for utilizing waste heat a steam generator having a burner for heating same, a source of fluctuating combustible gas supply, valve controlled means for conducting gas from said source to said generator burner, an accumulator having a burner for storing up heat units from said gas supply when said supply exceeds the demands of said generator, valve controlled by-pass means for leading such excess gas from said source to said accumulator burner unmixed with the gas which has been burned in said generator burner, said accumulator comprising a water heater, means for delivering water from said accumulator to said steam generator, and steam delivery means connecting said accumulator with said generator.

5. The method of utilizing the heat in a fluctuating combustible gas supply which mariner.

tuating supply when said supply is suffi cient for so doin and by-passing the excess of said supp y over said demands to the burner of said accumulator to heat the water in said accumulator, keeping the gas supplied to said accumulator burner unmixed with the spent gas burned in said generator burner, and, when said supply is insutlicient to 'meet the demands of said generator, delivering hot water from said accumulator to said generator.

6. The method of utilizing the heat in a fluctuating combustible gas supply which consists in providing a steam generator having a burner, and an accumulate having a burner, said accumulator comprising a water heater, supplying the demands of said steam generator burner from said fluctuatin suppl when said supply is sufiicient or so oin and by-pa'ssing the excess of said-supp y over said demands to the burner of said accumulator to heat the water in said accumulator, keeping the gas supplied to said accumulator burner unmixedwith the spent gas burned in said generator burner, and, when said supply is insufiicient to meet thedemands of said generator, delivering hot water from said accumulator to said generator at the pressure and temperature within said generator.

7. The method of utilizing the heat in a fluctuating combustible gas supply which consists in providing a steam generator having a burner to be provided-with gas from said supply and by-passing excess gas over and above the demands of said generator to the burner of an accumulator, keeping the gas supplied to said accumulator burner unmixed with the spent gas burned in said generator burner, and, when said gas supply is insufiicient to meet the demands of said generator, delivering hot water from said accumulator to sald generator.

8. The method of utilizing the heatvin a fluctuating combustible gas supply which consists in providing a steam generator having a burner to be provided with gas from said supply and by-passing excess gas overand above the demands of said generator to the burner of an accumulator, keeping the gas supplied to said accumula tor burner unmixed with the spent gas burned in said generator burner, preventin an unregulated supply of water from sai accumulator to said generator while heat units are being stored up in said accumulator, and, when said gas supply is insufficient to meet the demands of said generator, delivering hot water from said accumulator to said generator, 7

. In testimony whereof we hereunto afix our signatures in the presence of two witnesses.

ADALBERT BESTA. HEINR. LENT. Witnesses:

Henry W. Haas, P nine

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