Liquefied gas producing facility and liquefied gas producing method

Abstract

A liquefied gas producing facility is provided and includes: a first heat exchanger, a first refrigerant compressor, a second heat exchanger, a second refrigerant compressor, air-cooling heat exchangers for a first refrigerant, air-cooling condensers for a first refrigerant, air-cooling heat exchangers for a second refrigerant, air-cooling condensers for a second refrigerant and a mist spraying device. The liquefied gas producing facility can produce liquefied gas by liquefying feed gas which contains methane as a main component.

1 . A liquefied gas producing facility which produces liquefied gas by liquefying feed gas which contains methane as a main component, the liquefied gas producing facility comprising:
 a first heat exchanger that causes a first refrigerant to exchange heat with the feed gas and a second refrigerant to cool the feed gas and the second refrigerant;   a first refrigerant compressor that compresses the first refrigerant that is gasified through cooling the feed gas and the second refrigerant in the first heat exchanger;   a second heat exchanger that causes the second refrigerant to exchange heat with the feed gas that is cooled by the first heat exchanger to further cool and liquefy the feed gas;   a second refrigerant compressor that compresses the second refrigerant that is gasified through cooling the feed gas in the second heat exchanger;   air-cooling heat exchangers for the first refrigerant that air-cool the first refrigerant that is discharged from the first refrigerant compressor;   air-cooling condensers for the first refrigerant that air-cool the first refrigerant that is cooled by the air-cooling heat exchangers for the first refrigerant to liquefy the first refrigerant;   air-cooling heat exchangers for the second refrigerant that air-cool the second refrigerant that is discharged from the second refrigerant compressor;   air-cooling condensers for the second refrigerant that air-cool the second refrigerant that is cooled by the air-cooling heat exchangers for the second refrigerant to liquefy the second refrigerant; and   a mist spraying device that sprays a mist containing demineralized water toward cooling air supplied to at least one of the air-cooling condensers for the first refrigerant.   
     
     
         2 . The liquefied gas producing facility according to  claim 1 , further comprising:
 an acid gas removing device that removes acid gas contained in the feed gas with an amine solution; and   a demineralized water producing device that produces demineralized water for diluting the amine solution,   wherein the demineralized water contained in the mist is supplied from the demineralized water producing device.   
     
     
         3 . The liquefied gas producing facility according to  claim 1 ,
 wherein said at least one of the air-cooling condensers for the first refrigerant that are sprayed with the mist includes an air-cooling condenser for the first refrigerant on which an influence of hot air recirculation (HAR) is large and which is determined on the basis of meteorological field information concerning an area around a location at which the liquefied gas producing facility is installed, the meteorological field information being computed by using three-dimensional fluid dynamic equations.   
     
     
         4 . The liquefied gas producing facility according to  claim 3 ,
 wherein the meteorological field information concerning an area around a location at which the liquefied gas producing facility is installed is calculated by the steps of:   selecting, from a plurality of weather information which are related to areas and times and which include at least temperature data, a plurality of weather information sets related to a plurality of times over a fixed period concerning a first area containing a location at which the liquefied gas producing facility is installed;   solving, with the use of the selected plurality of weather information sets as input data, differential equations expressing the weather information based on an analysis model used for conducting a weather simulation, and generating a plurality of first narrow-area weather information sets related to a plurality of second areas which are disposed within the first area and which are smaller than the first area;   selecting a second narrow-area weather information set concerning a second area containing the location at which the liquefied gas producing facility is installed from among the generated plurality of first narrow-area weather information sets; and   computing the second narrow-area weather information set by using three-dimensional fluid dynamic equations and calculating the meteorological field information concerning the area around the location at which the liquefied gas producing facility is installed.   
     
     
         5 . A method for producing liquefied gas by liquefying feed gas which contains methane as a main component, the method comprising the steps of:
 causing, by using a first heat exchanger, a first refrigerant to exchange heat with the feed gas and a second refrigerant to cool the feed gas and the second refrigerant;   compressing, by using a first refrigerant compressor, the first refrigerant that is gasified through cooling the feed gas and the second refrigerant in the first heat exchanger;   causing, by using a second heat exchanger, the second refrigerant to exchange heat with the feed gas that is cooled by the first heat exchanger to further cool and liquefy the feed gas;   compressing, by using a second refrigerant compressor, the second refrigerant that is gasified through cooling the feed gas in the second heat exchanger;   air-cooling, by using air-cooling heat exchangers for the first refrigerant, the first refrigerant that is discharged from the first refrigerant compressor;   air-cooling, by using air-cooling condensers for the first refrigerant, the first refrigerant that is cooled by the air-cooling heat exchangers for the first refrigerant to liquefy the first refrigerant;   air-cooling, by using air-cooling heat exchangers for the second refrigerant, the second refrigerant that is discharged from the second refrigerant compressor;   air-cooling, by using air-cooling condensers for the second refrigerant, the second refrigerant that is cooled by the air-cooling heat exchangers for the second refrigerant to liquefy the second refrigerant; and   spraying a mist containing demineralized water toward cooling air supplied to at least one of the air-cooling condensers for the first refrigerant.   
     
     
         6 . The method for producing liquefied gas according to  claim 5 , further comprising the steps of:
 removing, by using an acid gas removing device, acid gas contained in the feed gas with an amine solution; and   producing, by using a demineralized water producing device, demineralized water for diluting the amine solution,   wherein the demineralized water contained in the mist is supplied from the demineralized water producing device.   
     
     
         7 . The method for producing liquefied gas according to  claim 5 ,
 wherein said at least one of the air-cooling condensers for the first refrigerant that are sprayed with the mist includes an air-cooling condenser for the first refrigerant on which an influence of hot air recirculation (HAR) is large and which is determined on the basis of meteorological field information concerning an area around a location at which the liquefied gas producing apparatus is installed, the meteorological field information being computed by using three-dimensional fluid dynamic equations.   
     
     
         8 . The method for producing liquefied gas according to  claim 7 ,
 wherein the meteorological field information concerning an area around a location at which the liquefied gas producing facility is installed is calculated by the steps of:   selecting, from a plurality of items of weather information which are related to areas and times and which include at least temperature data, a plurality of weather information sets related to a plurality of times over a fixed period concerning a first area containing a location at which the liquefied gas producing facility is installed;   solving, with the use of the selected plurality of weather information sets as input data, differential equations expressing the weather information based on an analysis model used for conducting a weather simulation, and generating a plurality of first narrow-area weather information sets related to a plurality of second areas which are disposed within the first area and which are smaller than the first area;   selecting a second narrow-area weather information set concerning a second area containing the location at which the liquefied gas producing facility is installed from among the generated plurality of first narrow-area weather information sets; and   computing the second narrow-area weather information set by using three-dimensional fluid dynamic equations and calculating the meteorological field information concerning the area around the location at which the liquefied gas producing facility is installed.   
     
     
         9 . The liquefied gas producing facility according to  claim 2 ,
 wherein said at least one of the air-cooling condensers for the first refrigerant that are sprayed with the mist includes an air-cooling condenser for the first refrigerant on which an influence of hot air recirculation (HAR) is large and which is determined on the basis of meteorological field information concerning an area around a location at which the liquefied gas producing facility is installed, the meteorological field information being computed by using three-dimensional fluid dynamic equations.   
     
     
         10 . The method for producing liquefied gas according to  claim 6 ,
 wherein said at least one of the air-cooling condensers for the first refrigerant that are sprayed with the mist includes an air-cooling condenser for the first refrigerant on which an influence of hot air recirculation (HAR) is large and which is determined on the basis of meteorological field information concerning an area around a location at which the liquefied gas producing apparatus is installed, the meteorological field information being computed by using three-dimensional fluid dynamic equations.