Pre-heat vaporization system
AssigneeStone & Webster Engineering Corp.
InventorRobert J. Gartside
Life of this patent
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Abstract
A process and system for vaporizing heavy oil prior to thermal cracking in a TRC system having low residence time on the order of 0.05 to 2 seconds, and at a temperature between 1300.degree. and 2500.degree. F.
Claims4
In a TRC process wherein the temperature in the cracking zone is between 1300.degree. and 2500.degree. F. and wherein hydrosulfurized residual oil along with the entrained inert solids and the diluent gas are passed through a cracking zone for a residence time of 0.05 to 2 seconds, the improvement in the process for preheating the heavy oil hydrocarbon feedstock comprising the steps of:
- a. heating the liquid heavy oil hydrocarbon feedstock;
- b. initially flashing the heated liquid heavy oil hydrocarbon feedstock with steam;
- c. separating the vapor and liquid phases of the flashed liquid heavy oil hydrocarbon feedstock-steam mixture;
- d. superheating the vapor phase of the flashed liquid heavy oil hydrocarbon feedstock-steam mixture;
- and
- e. flashing the superheated vapor and the liquid phase of the originally flashed liquid heavy oil hydrocarbon feedstock-steam mixture.
In a TRC system wherein the temperature in the cracking zone is between 1300.degree. and 2500.degree. F. and wherein the hydrosulfurized residual oil along with the entrained inert solids and the diluent gas are passed through a cracking zone for a residence time of 0.05 to 2 seconds, the improvement of providing a system for preheating the heavy oil hydrocarbon feedstock comprising:
- a. means for preheating the liquid heavy oil hydrocarbon;
- b. a first mixer for flashing the heated liquid heavy oil hydrocarbon and steam;
- c. a vapor feed superheater for heating the vapors from the first mixer to about 1,030.degree. F.;
- and
- d. a second mixer for flashing the superheated vapor and the liquid from the first mixer.
Dependencies are inferred from the claim text.