Methanol plant and gasoline synthesis plant
View Patent ↗Provided is a methanol plant that can obtain fresh water from sea water by using, in a seawater desalination device, the exhaust heat discharged in a step for producing methanol from natural gas. The methanol plant is provided with: a heat exchanger ( 4 ) that recovers into a thermal medium (for example, seawater) the exhaust heat discharged from a step for producing methanol from a feed stock (for example, natural gas); and a seawater desalinization device ( 6 ) that obtains freshwater from seawater using the exhaust heat recovered by means of the thermal medium.
1. A methanol plant comprising:
a heat exchanger which makes exhaust heat that is discharged from a process of producing methanol from a feed stock be recovered to seawater; and
a seawater desalination device which obtains fresh water from the seawater by using the exhaust heat recovered from the seawater by the heat exchanger,
wherein a plurality of the heat exchangers is provided in a distillation process of the process of producing methanol in a flow direction of mixed gas after methanol synthesis,
wherein the mixed gas passes through the plurality of heat exchangers, and a temperature of the mixed gas decreases, and a wetness of the mixed gas increases as it flows toward a downstream side in the flow direction of the mixed gas, and
wherein heat exchange with the mixed gas having increased wetness is performed in the heat exchanger provided on a downstream side in the flow direction of the mixed gas.
2. The methanol plant according to claim 1 , wherein the exhaust heat has a temperature in a range of 100° C. to 200° C.
3. The methanol plant according to claim 2 , wherein the seawater desalination device obtains the fresh water by a multistage flash evaporation method using the exhaust heat.
4. The methanol plant according to claim 2 , wherein the methanol is produced by using vapor which is produced from the fresh water.
5. The methanol plant according to claim 2 , wherein the process is provided with a step of producing gasoline from the methanol.
6. The methanol plant according to claim 1 , wherein the seawater desalination device obtains the fresh water by a multistage flash evaporation method using the exhaust heat.
7. The methanol plant according to claim 6 , wherein the methanol is produced by using vapor which is produced from the fresh water.
8. The methanol plant according to claim 6 , wherein the process is provided with a step of producing gasoline from the methanol.
9. The methanol plant according to claim 1 , wherein the methanol is produced by using vapor which is produced from the fresh water.
10. The methanol plant according to claim 9 , wherein the process is provided with a step of producing gasoline from the methanol.
11. The methanol plant according to claim 1 , wherein the process is provided with a step of producing gasoline from the methanol.
12. A gasoline synthesis plant comprising:
a methanol plant which produces methanol from a feed stock;
a heat exchanger which makes exhaust heat that is discharged from a process of producing gasoline from the methanol be recovered to seawater; and
a seawater desalination device which obtains fresh water from the seawater by using the exhaust heat recovered by the seawater.