Thermal cracking
View Patent ↗A method for thermally cracking a hydrocarbonaceous feed material using a combustion fuel fired furnace wherein at least part of the combustion fuel employed in the furnace is syngas.
1. In a process for the thermal cracking of at least one hydrocarbonaceous material wherein a combustion fuel fired furnace is employed, and wherein plant fuel gas is formed, said process producing at least one individual product for export from said process comprising the removal of at least part of hydrogen content and the addition of at least one BTU enhancing component, and comprising employing syngas as at least part of said combustion fuel.
2. The method of claim 1 wherein at least part of said plant fuel gas is recovered from said process and is further processed to produce an individual fuel gas product for export from said process in addition to said at least one individual product.
3. The method of claim 1 wherein said furnace is fired at least in part with at least one of natural gas and plant fuel gas, and said syngas is employed as a furnace combustion fuel in place of at least part of at least one of said natural gas and plant fuel gas.
4. The method of claim 1 wherein said syngas contains in major amount a mixture of hydrogen and carbon monoxide.
5. The method of claim 4 wherein said syngas contains from about 50 to about 65 mol % carbon monoxide, from about 25 to about 35 mol % hydrogen, from about 1 to about 15 mol % carbon dioxide, from about 1 to about 5 mol % nitrogen, and less than about 2 mol % methane, all mol % based on the total moles of said syngas.
6. The method of claim 1 wherein said plant fuel gas formed in said process contains methane in major amount and hydrogen in minor amount.
7. The method of claim 6 wherein said methane is present in an amount of from about 70 to about 95 mol %, said hydrogen is present in an amount of from about 3 to about 28 mol %, with the remainder being essentially a mixture of ethane and ethylene.
8. The method of claim 2 wherein said individual fuel gas product for export from said process contains at least about 80 mol % methane, and at least about 3 mol % hydrogen, with the remainder being essentially a mixture of ethane and ethylene.
9. The method of claim 2 wherein said plant fuel gas is processed to meet pipeline specifications for transport in said pipeline.
10. The method of claim 9 wherein said individual fuel gas product has a Btu content of at least about 950 Btu/SCF and is at a pressure of at least about 400 psig.
11. The method of claim 1 wherein said Btu enhancing component is methane.
12. The method of claim 1 wherein said further processing to produce said individual fuel gas product for export from said process excludes desulfurization of said fuel gas.
13. The method of claim 1 wherein said syngas is diluted with at least one gas to alter the flame temperature of said combustion fuel.