Heat exchange – Regenerator – Checker brick structure
Patent
1982-05-12
1985-05-28
Richter, Sheldon J.
Heat exchange
Regenerator
Checker brick structure
165 18, 165 47, 16510411, 165DIG4, 165DIG12, F24H 704, F28D 1500
Patent
active
045194408
DESCRIPTION:
BRIEF SUMMARY
The invention is related to a method and an apparatus for heat recovery in which waste heat is produced at different heat sources and temperatures, said method and said apparatus being so formed that total optimization can be obtained.
In many industries in which energy intensive processes and machines are used, in the paper-, textile- and washing industry for instance, significant amounts of energy are emitted to the environment with exhaust liquids, moisty outlet gases and different cooling mediums.
In such situations in which in order to save energy equipments for energy recovery are put in, the traditional way is to form this equipment to be used between emitted and supplied fluids, whereby a heat exchange occurs at a single machine or possibly a group of mutually similar machines.
On thermodynamical principles it follows that heat energy at a high temperature can be seen as higher "quality" than heat energy at a lower temperature. The conventional heat recovery often does not either give any opportunity to supply recovered waste heat to a process step with the exact high "quality" which is needed. Hereby follows that even if the totally recovered energy amount at a machine easily should be sufficient, there is in practice no possibility to this, since perhaps the recovered heat has a too low temperature.
Heat recovery often has the effect that simultaneousness must exist regarding the emitting of waste heat and the need thereof. For example, in a machine which has great thermal inertia and which after an operation stop must be cooled during a proportionately long period, the free waste heat cannot be re-used if the heat recovery only occurs locally, since any corresponding heat need to the machine does not exist after it has been stopped. Hence, the traditional local heat recovery means difficulties to with regard to the time compensate the supply of waste heat and the need thereof.
A method to recover heat from exhaust water which is supplied to a heat exchanger is previously known from e.g. SE-PS 382 496. When the temperature of the supplied exhaust water is below the temperature of the exhaust water in the heat exchanger the supplied exhaust water is by-passed the heat exchanger.
This method to recover heat from exhaust water is heat wasting for the reason that a great portion of the heat in the exhaust water is by-passed directly the heat exchanger and is therefore not recovered.
It is an object of this invention to provide a method for the recovery of heat from a process in which fluids are emitted at different temperatures from several waste heat sources, said method being defined to avoid the drawbacks mentioned above, i.e. to obtain a total optimization of the heat recovery, and simultaneously to increase the accessibility for waste heat and the use of the apparatus.
This object is attained according to the invention by the fact that the waste heat in said fluids is collected from every waste heat source or from mutually similar waste heat sources, that collected waste heat is assorted with regard to temperature and is then fed back to the system and/or a further consumer, said feedback being provided at a temperature as low as possible with regard to the application thereof.
To compensate varying need of waste heat values, but even varying medium flows from waste heat sources, collected waste heat values can be accumulated at the highest possible of a number of predetermined temperatures.
At a modified embodiment of the method according to the invention said collecting can be achieved by heat exchanging from the fluid of the waste heat source to a heat carrying fluid.
Another modified embodiment implies a direct discharge of a heat carrying fluid.
The invention is also related to an apparatus for executing said method, which apparatus comprises a number of waste heat sources with fluid outlets, especially of different temperatures, said apparatus being characterized by the fact that the fluid outlets dependent on the fluid and the temperature thereof, are to be connected to each other in grou
REFERENCES:
patent: 3623549 (1971-11-01), Smith, Jr.
patent: 3996759 (1976-12-01), Meckler
patent: 4190099 (1980-02-01), Despois et al.
patent: 4332290 (1982-06-01), Skala
patent: 4402188 (1983-09-01), Skala
Eslinger Lewis H.
Richter Sheldon J.
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