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Steam recovery in thermocompressors

IP.com Disclosure Number: IPCOM000249810D
Publication Date: 2017-Apr-07
Document File: 8 page(s) / 515K

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Karin Nordström Dyvelkov: AUTHOR

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GEA PROCESS ENGINEERING A/S

Steam recovery in thermocompressors

Henrik Moensted Schmidt

April 7, 2017

This document describes a technique for flash cooling various products. The technologies described in this docu- ment may be used and combined in all possible ways for all products within dairy, food, chemical, agro-chemical, energy, biotechnology, pharmaceutical, healthcare and many more, and are not limited in application to the ex- amples given but are wide open for all such products.

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1 Introduction This document describes a technique for flash cooling of various products by steam jet cooling and heat recovery by thermocompression. The technologies described in this document may be used and com- bined in all possible ways for all products within dairy, food, chemical, agro-chemical, energy, biotech- nology, pharmaceutical, healthcare and many more, and are not limited in application to the examples given but are wide open for all such products. In the bibliography you will find a list of references which is a basis for and/or a supplement to this arti- cle. These references shall be considered an integrated part of this document to be incorporated by ref- erence.

2 Background Cooling and heating are is an expensive processes. Ongoing increases in energy costs demand alterna- tives to traditional systems (mechanical compressors). More and more, flash cooling plants offer an en- vironmentally friendly and economical solution.

3 Steam jet cooling Steam jet cooling plants may be used for a large variety of products, for example water, aqueous nitric acid/phosphoric acid, aqueous plaster suspension, calcium milk, barium hydroxide solutions, various waste waters, fruit juice, milk and glue. The steam jet cooling plants may have today normal capacities between approximately 10 and 20 000 kilowatts, which may be expected to be higher in the future.

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Advantages of flash cooling plants:

• simple and robust construction reliable and safe to use • very little wear and tear owing to no moving parts • minimal maintenance • direct and indirect cooling is possible; with indirect • cooling, the cooling medium is almost always water • and therefore easy to handle • very low chilled-medium hold-up volume • frequent or fast change of load possible • minimum electrical energy required • waste heat and flash steam used as the motive media • used very efficiently during seasonal and/or batch • operation • coefficient of performance*1 value may be further • improved by employing a motive steam saving control

1 Coefficient of Performance = chilling capacity divided by motive power

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Vapor compression using jet pumps Jet pumps are compressors driven by a fluid and have no moving parts: the vapor, flashed from the suc- tion medium (i. e. the medium to be cooled) passes through the suction noz- zle, into the head of the jet pump. The motive medium (usually steam) is ex- panded, after passing through...