Fluid powered additive injection system
OwnerCarl L. Hammondsinventor
Life of this patent
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Abstract
An apparatus and method for proportionally injecting a liquid chemical into a fluid stream using a portion of the fluid stream as motive force for a chemical injection pump. The apparatus includes a paired single or double acting reciprocating injection pump and driver with the driver piston(s) having a surface area of three times the surface area of the injection piston(s). The portion of the fluid stream is passed through a prime mover to the pump and then discharged to atmosphere. A fluid product flow meter generates a signal which controls the cycling of the reciprocating pump.
Claims20
An injection system comprising,
- a source of pressurized fluid,
- a source of chemical additive (56),
- a delivery line (62) having an inlet fluidly coupled to said source of pressurized fluid and an outlet,
- a flow meter (42) fluidly coupled in said delivery line,
- a hydraulic prime mover (24, 19) fluidly coupled between a first point (A) of said delivery line upstream of said flow meter and a low pressure region (52),
- a metering pump (27, 28) mechanically coupled to said hydraulic prime mover (24, 19) and fluidly coupled between said source of chemical additive and a second point (B) of said delivery line downstream of said flow meter (42), and
- a control system (40, 30) coupled between said flow meter (42) and said prime mover (24, 19), said control system arranged and designed to control said prime mover as a function of the level of fluid flow measured by said flow meter (42).
An injection system comprising,
- a source of pressurized fluid,
- a source of chemical additive (56),
- a delivery line (62) having an inlet fluidly coupled to said source of pressurized fluid and an outlet,
- a flow meter (42) fluidly coupled in said delivery line,
- a power take-off flow line fluidly coupled between a first point (A) of said delivery line upstream of said flow meter and a low pressure region,
- a control valve (30) fluidly coupled in said power take-off flow line,
- a hydraulic prime mover (24, 19) fluidly coupled with said power take-off flow line,
- a metering pump (27, 80) mechanically coupled to said hydraulic prime mover and fluidly coupled between said source of chemical additive and a second point (B) of said delivery line downstream of said flow meter, and
- a control system (40) coupled between said flow meter and said control valve (30), said control system arranged and designed to adjustably control said metering pump (27, 80) as a function of an amount of fluid flow through said flow meter.
A method of injecting a chemical additive in proportion to a flow rate of a pressurized flowline comprising the steps of,
- diverting a portion of flow at a first point (A) in said flowline to create a diverted flow portion power a hydraulic prime mover, and exhausting said diverted flow portion to a low pressure region,
- measuring a remainder of flow at a second point that is downstream of said first point to create a measurement of said flow, in said flowline,
- controlling said diverted flow portion in a predetermined proportion to said measurement of said remainder of flow to control the motion of said hydraulic prime mover,
- coupling said hydraulic prime mover to a metering pump,
- fluidly coupling an input of said metering pump to a source of chemical additive, and
- fluidly coupling an output of said metering pump to a third point (B) in said flow line, said third point disposed downstream of said second point.
Dependencies are inferred from the claim text.