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US 9,885,239 B2Granted
Method and system for generating energy during the expansion of natural process gas
AssigneeBASF SE
InventorsMirko Haider, Thomas Brostean
Life of this patent
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Abstract
Provided is a method for energy recuperation in the expansion of processed natural gas before the delivery of the latter to an acetylene production plant (H). The method includes delivery of heated processed natural gas to an expansion device and expansion of the processed natural gas in the expansion device to a pressure of 2 bar to 8 bar. The expansion device is a piston expansion machine which is operated by the expansion of the processed natural gas and which generates energy. Also provided is a plant for energy recuperation in the expansion of processed natural gas.
Claims16
A method for energy recuperation in the expansion of processed natural gas during delivery to an acetylene production plant, comprising:
- a) delivering a processed natural gas from a processed natural gas supply line, wherein the processed natural gas has a temperature of −10° C. to 50° C. and a pressure of 30 bar to 70 bar, to a first heating stage and heating the processed natural gas in the first heating stage to a temperature of 20° C. to 40° C.,
- b) delivering the processed natural gas heated in the first heating stage to a second heating stage and heating the processed natural gas in the second heating stage to a temperature of 70° C. to 140° C.,
- c1) delivering the processed natural gas heated in the second heating stage to a first expansion stage of a piston expansion machine, wherein the piston expansion machine operates by the expansion of the processed natural gas and which generates energy, and expanding the processed natural gas in the first expansion stage to a pressure of 15 bar to 25 bar, wherein the processed natural gas has a temperature of 15° C. to 25° C. after the expansion in the first expansion stage,
- c2) delivering the processed natural gas expanded in the first expansion stage to a third heating stage and heating the processed natural gas in the third heating stage to a temperature of 70° C. to 140° C.,
- c3) delivering the processed natural gas heated in the third heating stage to a second expansion stage of the piston expansion machine and expanding the processed natural gas in the second expansion stage of the piston expansion machine to a pressure of 2 bar to 8 bar, wherein the processed natural gas has a temperature of 10° C. to 100° C. after the expansion in the second expansion stage,
- d) delivering the processed natural gas expanded in the second expansion stage of the piston expansion machine to a fourth heating stage and heating the processed natural gas in the fourth heating stage to a temperature of 40° C. to 100° C., wherein the processes natural gas has a pressure of 2 bar to 8 bar after the heating in the fourth heating stage, and
- e) delivering the processed natural gas having a pressure of 2 bar to 8 bar heated in the fourth heating stage to an acetylene production plant,
- wherein at least a portion of waste heat from the second heating stage and the third heating stage heats the processed natural gas in the fourth heating stage.
5 more elements
A plant for energy recuperation during the expansion of processed natural gas, comprising:
- a processed natural gas supply line,
- a first heating stage suitable for heating a processed natural gas, wherein the first heating stage is connected to the processed natural gas supply line via a feed line,
- a second heating stage suitable for heating the processed natural gas heated by the first heating stage, wherein the second heating stage is connected to the first heating stage via a line,
- a piston expansion machine suitable for expanding the processed natural gas heated by the second heating stage, and comprising a first expansion stage and a second expansion stage, wherein the piston expansion machine is connected to the second heating stage via a line,
- a third heating stage between the first expansion stage and the second expansion stage, wherein the third heating stage is connected to the first expansion stage via a line and is connected to the second expansion stage via a line, and
- a fourth heating stage suitable for heating the processed natural gas expanded in the second expansion stage of the piston expansion machine, wherein the fourth heating stage is connected to the second expansion stage via a line,
- wherein
- the second heating stage is connected to the fourth heating stage via a waste heat line,
- the third heating stage is connected to the fourth heating stage via a waste heat line, and
- the plant is connectable via one or more lines to an acetylene production plant.
7 more elements
Dependencies are inferred from the claim text.