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A system includes a heat exchange system and a power generation system. The heat exchange system includes first, second, and third heat exchangers each operable as a continuous source of heat from a delayed coking plant. The first and second heat exchangers heat first and second fluid streams to pro

A system includes a heat exchange system and a power generation system. The heat exchange system includes first, second, and third heat exchangers each operable as a continuous source of heat from a delayed coking plant. The first and second heat exchangers heat first and second fluid streams to produce heated first and second fluid streams, respectively. The heated second fluid stream has a lower temperature and a greater quantity of heat than the heated first fluid stream. The third heat exchanger heats a third fluid stream to produce a heated third fluid stream that includes the heated first fluid stream and a hot fluid stream. The heated third fluid stream has a lower temperature than the heated first fluid stream. The power generation system generates power using heat from the heated second and third fluid streams.

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1. A system comprising: a heat exchange system comprising: a first heat exchanger operable as a continuous source of heat from a delayed coking plant, the first heat exchanger configured to heat a first fluid stream to produce a heated first fluid stream;a second heat exchanger operable as a continu

1. A system comprising: a heat exchange system comprising: a first heat exchanger operable as a continuous source of heat from a delayed coking plant, the first heat exchanger configured to heat a first fluid stream to produce a heated first fluid stream;a second heat exchanger operable as a continuous source of heat from the delayed coking plant, the second heat exchanger configured to heat a second fluid stream to produce a heated second fluid stream, wherein the heated second fluid stream has a lower temperature and a greater quantity of heat than the heated first fluid stream;a third heat exchanger operable as a continuous source of heat to the delayed coking plant, the third heat exchanger configured to heat a third fluid stream to produce a heated third fluid stream, wherein the third fluid stream includes the heated first fluid stream and a hot fluid stream, wherein the heated third fluid stream has a lower temperature than the heated first fluid stream; anda power generation system configured to generate power using heat from the heated second fluid stream and the heated third fluid stream. 2. The system of claim 1, further comprising a fluid storage tank configured to receive an intermittent stream of hot fluid and to pass the hot fluid stream continuously. 3. The system of claim 2, further comprising a fourth heat exchanger operable as an intermittent source of heat from the delayed coking plant, the fourth heat exchanger configured to heat a fourth fluid stream to produce the intermittent stream of hot fluid. 4. The system of claim 3, wherein the intermittent hot stream has a greater quantity of heat and a lower temperature than the heated first fluid stream. 5. The system of claim 3, wherein the fourth heat exchanger recovers heat from an output stream from a coker blowdown tower in the delayed coking plant, wherein the output stream is an intermittent heat source. 6. The system of claim 3, wherein the heat exchange system comprises multiple fourth heat exchangers each configured to heat a portion of the intermittent fluid stream, wherein each fourth heat exchanger recovers heat from a corresponding intermittent heat source in the delayed coking plant. 7. The system of claim 1, wherein the first heat exchanger recovers heat from a continuous heat source in the delayed coking plant, the continuous heat source having a temperature of at least about 134° C. 8. The system of claim 1, wherein the first heat exchanger recovers heat from a bottom stream from a debutanizer in the delayed coking plant. 9. The system of claim 1, wherein the first heat exchanger recovers heat from a stream output from a fractionator in the delayed coking plant. 10. The system of claim 1, wherein the heat exchange system comprises multiple first heat exchangers each configured to heat a portion of the first fluid stream, wherein each first heat exchanger recovers heat from a corresponding continuous heat source in the delayed coking plant. 11. The system of claim 1, wherein the second heat exchanger recovers heat from a continuous heat source in the delayed coking plant, the continuous heat source having a temperature of less than about 134° C. 12. The system of claim 1, wherein the second heat exchanger recovers heat from an overhead stream from a fractionator in the delayed coking plant. 13. The system of claim 1, wherein the second heat exchanger recovers heat from an inter-stage stream or a discharge stream of a coker gas compressor in the delayed coking plant. 14. The system of claim 1, wherein the heat exchange system comprises multiple second heat exchangers each configured to heat a portion of the second fluid stream, wherein each second heat exchanger recovers heat from a corresponding continuous heat source in the delayed coking plant. 15. The system of claim 1, wherein the temperature of the heated third fluid stream is less than the temperature of the third fluid stream. 16. The system of claim 1, wherein the third heat exchanger is configured to heat a stripper bottom product from a stripper in the delayed coking plant by exchange with the third fluid stream. 17. The system of claim 1, wherein the third heat exchanger is configured to heat a rich sponge oil stream from a sponge absorber in the delayed coking plant by exchange with the third fluid stream. 18. The system of claim 1, wherein the heat exchange system comprises multiple third heat exchangers each configured to heat a corresponding stream in the delayed coking plant by exchange with a portion of the third fluid stream. 19. The system of claim 1, wherein the power generation system comprises an Organic Rankine cycle system. 20. The system of claim 1, wherein the system is integrated into the delayed coking plant as a retrofit to the delayed coking plant. 21. The system of claim 20, wherein one or more existing heat exchangers in the delayed coking plant are no longer used following the retrofit. 22. The system of claim 20, wherein, following the retrofit, the delayed coking plant uses up to about 13% less in heating utility consumption compared to the heating utility consumption of the delayed coking plant prior to the retrofit. 23. A method comprising: heating a first fluid stream to produce a heated first fluid stream by exchange with a first continuous source of heat from a delayed coking plant;heating a second fluid stream to produce a heated second fluid stream by exchange with a second continuous source of heat from the delayed coking plant, wherein the heated second fluid stream has a lower temperature and a greater quantity of heat than the heated first fluid stream;heating a stream in the delayed coking plant by exchange with a third fluid stream to produce a heated third fluid stream, wherein the third fluid stream includes the heated first fluid stream and a hot fluid stream, wherein the heated third fluid stream has a lower temperature than the heated first fluid stream; andgenerating power using heat from the heated second fluid stream and the heated third fluid stream. 24. The method of claim 23, further comprising: receiving an intermittent hot stream at a fluid storage tank; andcontinuously passing the hot fluid stream from the fluid storage tank. 25. The method of claim 24, further comprising heating a fourth fluid stream to produce the intermittent hot stream by exchange with an intermittent source of heat from the delayed coking plant. 26. The method of claim 25, wherein heating the fourth fluid stream comprises heating the third fluid stream using heat recovered from an output stream from a coker blowdown tower in the delayed coking plant, wherein the output stream is an intermittent heat source. 27. The method of claim 23, wherein heating the first fluid stream comprises heating the first fluid stream using heat recovered from a bottom stream from a debutanizer in the delayed coking plant. 28. The method of claim 23, wherein heating the first fluid stream comprises heating the first fluid stream using heat recovered from a stream output from a fractionator in the delayed coking plant. 29. The method of claim 23, wherein heating the second fluid stream comprises heating the second fluid stream using heat recovered from an overhead stream from a fractionator in the delayed coking plant. 30. The method of claim 23, wherein heating the second fluid stream comprises heating the second fluid stream using heat recovered from an inter-stage stream and or a discharge stream of a coker gas compressor in the delayed coking plant. 31. The method of claim 23, wherein heating a stream in the delayed coking plant comprises heating a stripper bottom product from a stripper in the delayed coking plant. 32. The method of claim 23, wherein heating a stream in the delayed coking plant comprises heating a rich sponge oil stream from a sponge absorber in the delayed coking plant. 33. The method of claim 23, wherein generating power comprises generating power using an Organic Rankine cycle system. 34. The method of claim 23, wherein generating power comprises generating at least about 9 MW of power. 35. The method of claim 23, further comprising returning the heated second fluid stream and the heated third fluid stream to an accumulation tank.