Power generation from waste heat in integrated hydrocracking and diesel hydrotreating facilities

Patent metadata

Field	Value
Publication number	US-9803930-B2
Application number	US-201615087329-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Aug 24, 2015
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A power generation system includes a heating fluid circuit thermally coupled to multiple heat sources from at least an integrated hydrocracking plant and diesel hydro-treating plant of a petrochemical refining system. A first subset of the heat sources includes diesel hydro-treating plant heat exchangers coupled to streams in the diesel hydro-treating plant. A second subset of the heat sources includes hydrocracking plant heat exchangers coupled to streams in the hydrocracking plant. The heat exchangers are connected to a power generation system that includes an organic Rankine cycle (ORC) including a working fluid that is thermally coupled to the heating fluid circuit to heat the working fluid, an expander configured to generate electrical power from the heated first working fluid, and a control system configured to activate a set of control valves to selectively thermally couple the heating fluid circuit to at least a portion of the heat sources.

First claim

What is claimed is:

1. A power generation system comprising:
a heating fluid circuit thermally coupled to a plurality of heat sources from a plurality of sub-units of a petrochemical refining system, wherein the plurality of sub-units comprises a hydrocracking plant and a diesel hydro-treating plant,
wherein a first subset of the plurality of heat sources comprises a plurality of diesel hydro-treating plant heat exchangers coupled to streams in the diesel hydro-treating plant,
wherein a second subset of the plurality of heat sources comprises a plurality of hydrocracking plant heat exchangers coupled to streams in the hydrocracking plant, wherein each hydrocracking plant heat exchanger comprises a respective stream circulated through the hydrocracking plant and a portion of the heating fluid,
wherein:
a first hydrocracking plant heat exchanger exchanges heat between a 2nd reaction section, 2nd stage cold high pressure separator feed stream and a portion of the heating fluid,
a second hydrocracking plant heat exchanger exchanges heat between a 1st reaction section, 1st stage cold high pressure separator feed stream and a portion of the heating fluid,
a third hydrocracking plant heat exchanger exchanges heat between a product stripper overhead stream and a portion of the heating fluid,
a fourth hydrocracking plant heat exchanger exchanges heat between a main fractionator overhead stream and a portion of the heating fluid,
a fifth hydrocracking plant heat exchanger exchanges heat between a kerosene product stream and a portion of the heating fluid,
a sixth hydrocracking plant heat exchanger exchanges heat between a kerosene pump around stream and a portion of the heating fluid, and
a seventh hydrocracking plant heat exchanger exchanges heat between a diesel product stream and a portion of the heating fluid;

a first power generation system that comprises an organic Rankine cycle (ORC), the ORC comprising (i) a working fluid that is thermally coupled to the heating fluid circuit to heat the working fluid, and (ii) an expander configured to generate electrical power from the heated working fluid; and
a control system configured to activate a set of control valves to selectively thermally couple the heating fluid circuit to at least a portion of the plurality of heat sources.

2. The system of claim 1 , wherein the working fluid is thermally coupled to the heating fluid circuit in an evaporator of the ORC.

3. The system of claim 2 , wherein the working fluid comprises isobutane.

4. The system of claim 1 , wherein the heating fluid circuit comprises a heating fluid tank that is fluidly coupled to the heating fluid circuit.

5. The system of claim 1 , wherein the plurality of heat sources comprises ten heat sources, wherein the first subset comprises three diesel hydro-treating plant heat exchangers and the second subset comprises seven hydrocracking plant heat exchangers.

6. The system of claim 1 , wherein each diesel hydro-treating plant heat exchanger comprises a respective stream circulated through the diesel hydro-treating plant and a portion of the heating fluid.

7. The system of claim 6 , wherein:
a first diesel hydro-treating plant heat exchanger exchanges heat between a light effluent to cold separator stream and a portion of the heating fluid,
a second diesel hydro-treating plant heat exchanger exchanges heat between a diesel stripper overhead stream and a portion of the heating fluid, and
a third diesel hydro-treating plant heat exchanger exchanges heat between a diesel stripper product stream and a portion of the heating fluid.

8. The system of claim 1 , wherein the plurality of heat sources are fluidly coupled in parallel.

9. The system of claim 1 , wherein the heating fluid circuit comprises water or oil.

10. The system of claim 1 , wherein the first power generation system is on-site at the petrochemical refining system.

11. The system of claim 1 , wherein the first power generation system is configured to generate about 45 MW of power.

12. A method of recovering heat energy generated by a petrochemical refining system, the method comprising:
identifying a geographic layout to arrange a plurality of sub-units of a petrochemical refining system, the geographic layout including a plurality of sub-unit locations at which the respective plurality of sub-units are to be positioned, wherein the plurality of sub-units comprises a hydrocracking plant and a diesel hydro-treating plant;
identifying a first subset of the plurality of sub-units of the petrochemical refining system, the first subset including a plurality of diesel hydro-treating plant heat exchangers coupled to streams in the diesel hydro-treating plant and a plurality of hydrocracking plant heat exchangers coupled to streams in the hydrocracking plant, wherein heat energy is recoverable from the first subset of the plurality of sub-units to generate electrical power;
identifying, in the geographic layout, a second subset of the plurality of sub-unit locations, the second subset including sub-unit locations at which the respective sub-units in the first subset are to be positioned;
identifying a power generation system to recover heat energy from the sub-units in the first subset, the power generation system comprising:
a heating fluid circuit fluidly connected to the sub-units in the first subset;
a first power generation system that comprises an organic Rankine cycle (ORC), the ORC comprising (i) a working fluid that is thermally coupled to the heating fluid circuit to heat the working fluid, and (ii) an expander configured to generate electrical power from the heated working fluid; and
a control system configured to activate a set of control valves to selectively thermally couple the heating fluid circuit to the first subset;

identifying, in the geographic layout, a power generation system location to position the power generation system, wherein a heat energy recovery efficiency at the power generation system location is greater than a heat energy recovery efficiency at other sub-unit locations within the geographic layout,
operating the petrochemical refining system to refine petrochemicals;
operating the power generation system to:
recover heat energy from the sub-units in the first subset through the heating fluid circuit;
provide the recovered heat energy to the power generation system; and
generate power using the recovered heat energy; and

wherein each hydrocracking plant heat exchanger comprises a respective stream circulated through the hydrocracking plant and a portion of the heating fluid, and wherein operating the petrochemical refining system to refine petrochemicals comprises:
operating a first hydrocracking plant heat exchanger to exchange heat between a 2nd reaction section, 2nd stage cold high pressure separator feed stream and a portion of the heating fluid,
operating a second hydrocracking plant heat exchanger to exchange heat between a 1st reaction section, 1st stage cold high pressure separator feed stream and a portion of the heating fluid,
operating a third hydrocracking plant heat exchanger to exchange heat between a product stripper overhead stream and a portion of the heating fluid,
operating a fourth hydrocracking plant heat exchanger to exchange heat between a main fractionator overhead stream and a portion of the heating fluid,
operating a fifth hydrocracking plant heat exchanger to exchange heat between a kerosene product stream and a portion of the heating fluid,
operating a sixth hydrocracking plant heat exchanger to exchange heat between a kerosene pump around stream and a portion of the heating fluid, and
operating a seventh hydrocracking

Assignees

• Saudi Arabian Oil Co

Inventors

• Noureldin Mahmoud Bahy Mahmoud
• Al Saed Hani Mohammed
• Bunaiyan Ahmad Saleh

Classifications

• C01B2203/127

  Catalytic desulfurisation · CPC title

• C01B2203/0227

  containing a catalytic reforming step · CPC title

• C01B2203/043

  Regenerative adsorption process in two or more beds, one for adsorption, the other for regeneration · CPC title

• C01B3/34 Primary

  by reaction of hydrocarbons with gasifying agents · CPC title

• C01B2203/0283

  containing a CO-shift step, i.e. a water gas shift step · CPC title