Systems for recovery and re-use of waste energy in crude oil refining facility and aromatics complex through simultaneous intra-plant integration and plants' thermal coupling

Patent metadata

Field	Value
Publication number	US-10502494-B2
Application number	US-201715833639-A
Country	US
Kind code	B2
Filing date	Dec 6, 2017
Priority date	Aug 24, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Configurations and related processing schemes of direct or indirect (or both) intra-plants and thermally coupled heating systems synthesized for grassroots medium grade crude oil semi-conversion refineries to increase energy efficiency from specific portions of low grade waste heat sources are described. Configurations and related processing schemes of direct or indirect (or both) intra-plants and thermally coupled heating systems synthesized for integrated medium grade crude oil semi-conversion refineries and aromatics complex for increasing energy efficiency from specific portions of low grade waste sources are also described.

First claim

The invention claimed is:

1. A system comprising:
an aromatics plant of a crude oil refining facility, the aromatics plant configured to perform at least one oil refining process, the aromatics plant comprising a plurality of aromatics plant sub-units flowing a plurality of streams at respective temperatures flowing between the plurality of aromatics plant sub-units, the plurality of aromatics plant sub-units comprising an aromatics complex xylene products separation unit and an aromatics complex benzene extraction unit;
a first oil refining plant of a plurality of oil refining plants of the crude oil refining facility, the first oil refining plant being different from the aromatics plant, the first oil refining plant comprises a sulfur recovery plant;
a flow control system connected to the aromatics plant and the plurality of oil refining plants, the flow control system configured to:
flow one or more of the plurality of streams of the plurality of aromatics plant sub-units to a heat exchanger system, wherein the one or more of the plurality of streams comprise a raffinate overhead stream in the aromatics complex xylene products separation unit, a benzene column bottoms stream in the aromatics complex benzene extraction unit, or a raffinate splitter column bottoms stream in the aromatics complex benzene extraction unit; and
flow a stream from the first oil refining plant to the heat exchanger system, wherein the stream from the first oil refining plant comprises an amine regenerator bottoms stream in a sulfur recovery plant of the plurality of oil refining plants; and

the heat exchanger system comprising a first heat exchanger configured to transfer heat from one or more of the plurality of streams to the stream from the first oil refining plant.

2. The system of claim 1 , wherein the heat exchanger system is configured to directly heat the stream from the first oil refining plant using the plurality of streams from the plurality of aromatics plant sub-units.

3. The system of claim 2 , wherein, to directly heat the stream from the first oil refining plant, the heat exchanger system comprises:
the first heat exchanger configured to heat the amine regenerator bottoms stream in the sulfur recovery plant of the plurality of oil refining plants using a first branch of the raffinate overhead stream;
a second heat exchanger configured to heat the benzene column bottoms stream in the aromatics complex benzene extraction unit of the plurality of aromatics plant sub-units using a second branch of the raffinate overhead stream; and
a third heat exchanger configured to heat the raffinate splitter column bottoms stream in the aromatics complex benzene extraction unit using a third branch of the raffinate overhead stream, and
wherein the flow control system is configured to:
flow the heated amine regenerator bottoms stream to the sulfur recovery plant, and
flow the heated benzene column bottoms stream and the heated raffinate splitter column bottoms stream to the aromatics plant.

4. The system of claim 3 , wherein the first heat exchanger, the second heat exchanger and the third heat exchanger are fluidically coupled to each other in parallel.

5. The system of claim 2 , wherein the plurality of aromatics plant sub-units comprises an aromatics complex xylene products separation unit and an aromatics complex benzene extraction unit, wherein the first oil refining plant comprises a sour water stripper plant in the crude oil facility and wherein, to directly heat the stream from the first oil refining plant, the heat exchanger system comprises:
the first heat exchanger configured to heat a sour water stripper bottom stream in the sour water stripper plant using a first branch of the raffinate overhead stream;
a second heat exchanger configured to heat a benzene column bottoms stream in the aromatics complex benzene extraction unit using a second branch of the raffinate overhead stream; and
a third heat exchanger configured to heat a raffinate splitter column bottoms stream in the aromatics complex benzene extraction unit using a third branch of the raffinate overhead stream, and
wherein the flow control system is configured to flow the heated sour water stripper bottom stream, the heated benzene column bottoms stream and the heated raffinate splitter column bottoms stream to the aromatics plant.

6. The system of claim 5 , wherein the first heat exchanger, the second heat exchanger and the third heat exchanger are fluidically coupled to each other in parallel.

7. The system of claim 1 , wherein the heat exchanger system is configured to indirectly heat the stream from the first oil refining plant through a buffer fluid using the multiple streams from the plurality of aromatics plant sub-units.

8. The system of claim 7 , wherein the buffer fluid comprises at least one of oil or water.

9. The system of claim 7 , wherein, to indirectly heat the stream from the first oil refining plant using the multiple streams from the plurality of aromatics plant sub-units, the heat exchanger system comprises:
the first heat exchanger configured to heat the buffer fluid using a raffinate overhead stream in the aromatics complex xylene products separation unit of the plurality of aromatics plant sub-units.

10. The system of claim 9 , wherein the flow control system is configured to flow the heated buffer fluid to an amine regeneration plant separation section, and
wherein the heat exchanger system comprises a second heat exchanger configured to heat an acid gas regenerator bottom stream in the amine regeneration plant separation section using the heated buffer fluid.

11. The system of claim 10 , wherein the first heat exchanger and the second heat exchanger are fluidically coupled to each other in series.

12. The system of claim 9 , wherein the flow control system is configured to:
flow the heated buffer fluid to a collection header;
split the heated buffer fluid into a first branch, a second branch and a third branch of the heated buffer fluid;
flow the first branch of the heated buffer fluid to a sulfur recovery plant; and
flow the second branch of the heated buffer fluid to an aromatics complex benzene extraction unit; and
wherein the heat exchanger system is comprises:
a second heat exchanger configured to heat an amine regenerator bottoms stream in the sulfur recovery plant using the first branch of the heated buffer fluid, and
a third heat exchanger configured to heat a benzene column bottoms stream in the aromatics complex benzene extraction unit using the second branch of the heated buffer fluid.

13. The system of claim 12 , wherein the flow control system is configured to flow the heated buffer fluid to an aromatics complex benzene extraction unit, and
wherein the heat exchanger system comprises a fourth heat exchanger configured to heat a benzene column bottoms stream in the aromatics complex benzene extraction unit using the heated buffer fluid.

14. The system of claim 12 , wherein the flow control system is configured to:
split the heated buffer fluid exiting the third heat exchanger into a first branch and a second branch of the heated buffer fluid; and
flow the first branch of the heated buffer fluid to a sour water stripper plant, and
flow the second branch of the heated buffer fluid to the aromatics complex benzene extraction unit;
wherein the heat exchanger system comprises:
a fifth heat exchanger configured to heat a sour water stripper bottom stream in the sour water stripper plant using the first branch of the heated buffer fluid;
a sixth heat exchanger configured to heat a raffinate splitter column bottoms strea

Assignees

• Saudi Arabian Oil Co

Inventors

• Noureldin Mahmoud Bahy Mahmoud
• Al Saed Hani Mohammed

Classifications

• C10G2400/30

  Aromatics · CPC title

• B01D53/1462

  Removing mixtures of hydrogen sulfide and carbon dioxide · CPC title

• F01K27/02

  Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat · CPC title

• F01K3/185

  using waste heat from outside the plant (F02G5/00 takes precedence) · CPC title

• C10G47/00

  Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions (C10G15/00 takes precedence; destructive hydrogenation of non-melting solid carbonaceous or similar materials C10G1/06) · CPC title