Method for controlling the capacity of a blower and a device for

Details Method for controlling the capacity of a blower and a device for Method for controlling the capacity of a blower and a device for

1975-07-30

1977-04-05

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

With vapor discharged from storage receptacle

48191, 62 50, 137 4, 137 91, 417302, 417901, F17C 702

Patent

active

040154360

ABSTRACT:
A method of controlling the capacity of a gas blower for pumping gas at a given discharge pressure involving cooling the gas at the suction side of the blower. The method is especially useful for controlling the pressure in a liquefied gas storage tank so as to maintain it substantially constant. The boil-off gas in the tank is exhausted by a gas blower and liquefied gas is injected into the boil-off gas exhausted from the tank at a point on the suction side of the blower for cooling the boil-off gas exhausted from the tank prior to its being pumped by the blower. The amount of liquefied gas injected into the boil-off gas is proportional to the pressure of the boil-off gas in the storage tank. The apparatus for the control includes a temperature controller coupled between a control valve controlling the injection of liquefied gas and the gas discharging tube on the suction side of said blower for opening the control valve according to the difference between a set temperature and a sensed temperature, and a pressure controller coupled between the temperature controller and the gas discharging tube adjacent the storage tank for sensing the pressure of gas in the tank and setting the temperature of the temperature controller at which the temperature controller actuates the control valve according to the pressure in the storage tank.

REFERENCES:
patent: 3121999 (1964-02-01), Kasbohm et al.
patent: 3369371 (1968-02-01), Holly et al.
patent: 3689237 (1972-09-01), Stark et al.
patent: 3690115 (1972-09-01), Clayton
patent: 3771260 (1973-11-01), Arenson

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