Combustion air preheating

Patent · Tue Oct 14 04:00:00 EDT 1986

OSTI ID:5016583

Wells, T A; Petterson, W C

This patent describes a process for steam cracking hydrocarbons to cracked gases in a tubular furnace heated by burning a mixture of fuel and combustion air and subsequently quenching the cracked gases. Waste heat is recovered in the form of high pressure steam and the combustion air is preheated prior to introduction into the furnace. The improvement described here comprises: (a) superheating the high pressure steam and expanding at least a portion of the superheated high pressure steam through a first turbine to produce shaft work and superheated medium pressure steam at a temperature between 260/sup 0/ and 465/sup 0/ C.; (b) expanding at least a portion of the superheated medium pressure steam through a second turbine to produce shaft work and low pressure steam at a temperature between 120/sup 0/ and 325/sup 0/ C.; and (c) preheating the combustion air by indirect heat exchange with at least a portion of the superheated medium pressure stream and at least a portion of the low pressure steam.

• Assignee: M.W. Kellogg Co., Houston, TX
• Patent Number(s): US 4617109
• OSTI ID: 5016583
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AIR
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION CONTROL
CONTROL
COOLING
CRACKING
DECOMPOSITION
ENERGY RECOVERY
ENERGY TRANSFER
EXPANSION
FLUE GAS
FLUIDS
FUELS
FURNACES
GASEOUS WASTES
GASES
HEAT RECOVERY
HEAT TRANSFER
HEATING
HIGH TEMPERATURE
HYDROCARBONS
MACHINERY
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
OXIDATION
PYROLYSIS
RECOVERY
STEAM
STEAM TURBINES
SUPERHEATING
THERMAL CRACKING
THERMAL EXPANSION
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES