Steam-hydrocarbon process. [heat recovery from low-grade waste heat]
Patent
·
OSTI ID:5158159
In a process of reacting a hydrocarbon with steam and/or carbon dioxide in a reaction zone heated by a combustion furnace to give olefins or process gas containing carbon oxides and hydrogen, high grade heat is recovered from furnace flue gases and/or process gas whereby to cool such gases to 150 to 300/sup 0/C. When the process gas is used in a synthesis of for example methanol or ammonia, gases at 150/sup 0/ to 300/sup 0/C are also produced. Previously the recovery of heat from such low grade heat sources has been inefficient or inconvenient. According to the invention the heat is recovered by means of an intermediary liquid coolant, which is brought into direct heat exchange with streams to be used in the process. Preferably the liquid is water under pressure and is brought into direct heat exchange with a gas to be fed to the process; by this means 10 to 30 percent of the steam can be provided from low grade waste heat.
- Assignee:
- Imperial Chemical Industries Ltd.
- Patent Number(s):
- US 4072625
- OSTI ID:
- 5158159
- Country of Publication:
- United States
- Language:
- English
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