Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1979-11-02
1982-11-02
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
73 29, 137 93, G05D 1110
Patent
active
043568343
ABSTRACT:
The invention is a system for controlling the mass flow rates of vapor and carrier gas in a flowing fluid mixture. A regulated flow of carrier gas is divided so that a fraction of the flow passes through a vaporizer to pick up the vapor while the balance bypasses the vaporizer. The streams are then recombined and the resulting mixture is passed through a dew point detector which gives an output signal which varies according to variations in the mass ratio of the vapor to the carrier gas. A controller responds to the detector signal to generate a control signal which modulates a valve to vary the fraction of the carrier gas passing through the vaporizer, thereby influencing the mass rate at which the vapor is introduced. The feedback control from the dew point detector to the valve is adapted to regulate the dew point, and thereby the mass ratio of vapor to carrier. Since carrier mass flow rate is separately regulated, the regulation of the mass fraction of vapor in the blend results in the regulation of vapor mass flow rate as well.
REFERENCES:
patent: 3252319 (1966-05-01), Wood et al.
patent: 4220460 (1980-09-01), Partus
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