Controlling method of air separator

Claim 1

A method of controlling an air separator comprising: calculating a product quantity that can be collected by use of a predetermined maximum raw air quantity that can be supplied and by use of an operating condition of a bubble tower; comparing an input value of a necessary product quantity with said product quantity that can be collected; setting said necessary product quantity as a product formation quantity when said necessary product quantity is smaller than, or equal to, said product quantity that can be collected; outputting said product formation quantity as a set value for a product formation quantity adjusting device; calculating a necessary raw air quantity by use of said set value for said product formation quantity adjusting device and said operating condition of said bubble tower; outputting said necessary raw air quantity as a set value for a raw air quantity adjusting device; setting said product quantity that can be collected as said product formation quantity when said necessary product quantity is greater than said product quantity that can be collected; outputting said product formation quantity as a set value for a product formation quantity adjusting device; and outputting said maximum raw air quantity as a set value for a raw air quantity adjusting device.

Claim 2

A method of controlling an air separator comprising: calculating a product quantity that can be collected by use of a predetermined maximum raw air quantity that can be supplied and by use of an operating condition of a bubble tower; comparing an input value of a necessary product quantity with said product quantity that can be collected; setting said necessary product quantity as a product formation quantity when said necessary product quantity is smaller than, or equal to, said product quantity that can be collected; outputting said product formation quantity as a set value for a product formation quantity adjusting device; calculating a necessary raw air quantity by use of said set value for said product formation quantity adjusting device and said operating condition of said bubble tower; outputting said necessary raw air quantity as a set value for a raw air quantity adjusting device; setting said product quantity that can be collected as said product formation quantity when said necessary product quantity is greater than said product quantity that can be collected; outputting said product formation quantity as a set value for a product formation quantity adjusting device; and outputting said maximum raw air quantity as a set value for a raw air quantity adjusting device.

Claim 5

A method of controlling an air separator comprising: calculating a gas product quantity that can be collected by using the equation; ##EQU9## wherein, QA=predetermined maximum raw air quantity that can be supplied, x=oxygen content in liquid air at a lower portion of a bubble tower, QGN=gas product quantity that can be collected; comparing an input value of a necessary gas product quantity with said gas product quantity that can be collected; setting said necessary gas product quantity as a gas product formation quantity when said necessary gas product quantity is smaller than or equal to said gas product quantity that can be collected; outputting said gas product formation quantity as a set value for a gas product formation quantity adjusting device; calculating a liquid product quantity that can be collected using the equation; ΔQGN=(2-L/V)ΔQLN wherein, ΔQGN=difference between gas product quantity that can be collected and gas product formation quantity, L/V=0.21/x, where x is the oxygen content in liquid air of said lower portion of said bubble tower, ΔQLN=difference between a liquid product quantity that can be collected and a necessary liquid product quantity; setting said necessary liquid product quantity as a liquid product formation quantity when said necessary liquid product quantity is smaller than or equal to said liquid product quantity that can be collected; outputting said liquid product formation quantity as a set value for a liquid product formation quantity adjusting device; calculating a necessary raw air quantity by using at least one of the equations; ##EQU10## wherein, QA=necessary raw air quantity QGN=gas product formation quantity QLN=liquid product formation quantity x=oxygen content in liquid air of said lower portion of said bubble tower; outputting said necessary raw air quantity as a set value for a raw air quantity adjusting device; setting said liquid product quantity that can be collected as a liquid product formation quantity when said necessary liquid product quantity is greater than said liquid product quantity that can be collected; outputting said liquid product formation quantity as a set value for said liquid product formation quantity adjusting device; outputting said maximum raw air quantity as a set value for said raw air quantity adjusting device; setting said gas product quantity that can be collected as a gas product formation quantity when said necessary gas product quantity is greater than said gas product quantity that can be collected; outputting said gas product formation quantity as a set value for said gas product formation quantity adjusting device; outputting zero as a set value for said liquid product formation quantity adjusting device; and outputting said maximum raw air quantity as a set value for said raw air quantity adjusting device.

Claim 6

A method of controlling an air separator comprising: calculating a gas product quantity that can be collected by using the equation; ##EQU9## wherein, QA=predetermined maximum raw air quantity that can be supplied, x=oxygen content in liquid air at a lower portion of a bubble tower, QGN=gas product quantity that can be collected; comparing an input value of a necessary gas product quantity with said gas product quantity that can be collected; setting said necessary gas product quantity as a gas product formation quantity when said necessary gas product quantity is smaller than or equal to said gas product quantity that can be collected; outputting said gas product formation quantity as a set value for a gas product formation quantity adjusting device; calculating a liquid product quantity that can be collected using the equation; ΔQGN=(2-L/V)ΔQLN wherein, ΔQGN=difference between gas product quantity that can be collected and gas product formation quantity, L/V=0.21/x, where x is the oxygen content in liquid air of said lower portion of said bubble tower, ΔQLN=difference between a liquid product quantity that can be collected and a necessary liquid product quantity; setting said necessary liquid product quantity as a liquid product formation quantity when said necessary liquid product quantity is smaller than or equal to said liquid product quantity that can be collected; outputting said liquid product formation quantity as a set value for a liquid product formation quantity adjusting device; calculating a necessary raw air quantity by using at least one of the equations; ##EQU10## wherein, QA=necessary raw air quantity QGN=gas product formation quantity QLN=liquid product formation quantity x=oxygen content in liquid air of said lower portion of said bubble tower; outputting said necessary raw air quantity as a set value for a raw air quantity adjusting device; setting said liquid product quantity that can be collected as a liquid product formation quantity when said necessary liquid product quantity is greater than said liquid product quantity that can be collected; outputting said liquid product formation quantity as a set value for said liquid product formation quantity adjusting device; outputting said maximum raw air quantity as a set value for said raw air quantity adjusting device; setting said gas product quantity that can be collected as a gas product formation quantity when said necessary gas product quantity is greater than said gas product quantity that can be collected; outputting said gas product formation quantity as a set value for said gas product formation quantity adjusting device; outputting zero as a set value for said liquid product formation quantity adjusting device; and outputting said maximum raw air quantity as a set value for said raw air quantity adjusting device.