Power Generation using Independent Dual Organic Rankine Cycles from Waste Heat Systems in Diesel Hydrotreating-Hydrocracking and Atmospheric Distillation-Naphtha Hydrotreating-Aromatics Facilities

摘要

Optimizing power generation from waste heat in large industrial facilities such as petroleum refineries by utilizing a subset of all available hot source streams selected based, in part, on considerations for example, capital cost, ease of operation, economics of scale power generation, a number of ORC machines to be operated, operating conditions of each ORC machine, combinations of them, or other considerations are described. Subsets of hot sources that are optimized to provide waste heat to one or more ORC machines for power generation are also described. Further, recognizing that the utilization of waste heat from all available hot sources in a mega-site such as a petroleum refinery and aromatics complex is not necessarily or not always the best option, hot source units in petroleum refineries from which waste heat can be consolidated to power the one or more ORC machines are identified.

主权项

1. A power generation system, comprising:
a first heating fluid circuit thermally coupled to a first plurality of heat sources from a first plurality of sub-units of a petrochemical refining system, the first plurality of sub-units comprising a para-xylene separation unit and an atmospheric distillation-Naphtha hydrotreating-aromatics plant; a second heating fluid circuit thermally coupled to a second plurality of heat sources from a second plurality of sub-units of the petrochemical refining system, the second plurality of sub-units comprising an aromatics refining system; a third heating fluid circuit thermally coupled to a third plurality of heat sources of a third plurality of sub-units of the petrochemical refining system, the third plurality of sub-units comprising a hydrocracking-diesel hydrotreating system; a first power generation system that comprises a first organic Rankine cycle (ORC), the first ORC comprising (i) a first working fluid that is thermally coupled to the first and second heating fluid circuits to heat the first working fluid, and (ii) a first expander configured to generate electrical power from the heated first working fluid; a second power generation system that comprises a second ORC, the second ORC comprising (i) a second working fluid that is thermally coupled to the second heating fluid circuit to heat the second working fluid, and (ii) a second expander configured to generate electrical power from the heated second working fluid; and a control system configured to actuate a first set of control valves to selectively thermally couple the first heating fluid circuit to at least a portion of the first plurality of heat sources, the control system also configured to actuate a second set of control valves to selectively thermally couple the second heating fluid circuit to at least a portion of the second plurality of heat sources, the control system also configured to actuate a third set of control valves to selectively thermally couple the third heating fluid circuit to at least a portion of the third plurality of heat sources.