Desalination system with energy recovery and related pumps, valves and controller
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-061/06
B01D-061/08
B01D-061/12
B01D-061/10
B01D-061/02
F04B-049/06
F04B-049/22
C02F-001/44
출원번호
US-0250463
(2011-09-30)
등록번호
US-9387440
(2016-07-12)
발명자
/ 주소
d'Artenay, Matthew D.
Childs, Willard D.
Vanderloop, Gerard J.
Connor, Jr., Michael J.
출원인 / 주소
General Electric Company
인용정보
피인용 횟수 :
0인용 특허 :
49
초록▼
A fluid pumping system with energy recovery features may provide feed water to a reverse osmosis unit. The system includes an electronic controller unit that regulates the output of three hydraulic pumps. Each hydraulic pump drives the movement of a piston in a cylinder. The pistons collectively del
A fluid pumping system with energy recovery features may provide feed water to a reverse osmosis unit. The system includes an electronic controller unit that regulates the output of three hydraulic pumps. Each hydraulic pump drives the movement of a piston in a cylinder. The pistons collectively deliver a generally constant flow of high pressure feed water. Valve bodies direct reverse osmosis concentrate to the back sides of the pistons. The electronic controller coordinates the output of the hydraulic pumps with the actuation of the valve bodies. Movement of the pistons is controlled, in part, by a feed back loop to verify the desired hydraulic pump output. Valve bodies are designed to begin closing when an associated piston velocity decreases. The valve body moves after a dwell period when an associated piston should not be moving. The piston and cylinder are designed for exposure to high salt-content water.
대표청구항▼
1. An apparatus comprising, a) a membrane system having a feed water inlet and a brine outlet;b) a pump comprising a piston rod connected to a piston in a cylinder, the piston having a front face and a back face, the pump adapted to pressurize feed water against the front face of the piston and to c
1. An apparatus comprising, a) a membrane system having a feed water inlet and a brine outlet;b) a pump comprising a piston rod connected to a piston in a cylinder, the piston having a front face and a back face, the pump adapted to pressurize feed water against the front face of the piston and to cause the feed water to flow to the feed water inlet of the membrane system;c) a conduit connecting the brine outlet of the membrane system to the back face of the piston;d) a valve in the conduit;e) a hydraulic pump connected to the piston rod, the hydraulic pump comprising a hydraulic cylinder with a hydraulic piston connected to the piston rod, a pair of hydraulic lines connected to provide fluid to chambers adjacent to opposed faces of the hydraulic piston, and a flow control mechanism to selectively pressurize the hydraulic lines;f) a controller connected to the hydraulic pump;g) a first sensor operatively coupled to the hydraulic pump and configured to detect a position of the flow control mechanism related to the actual fluid flow output of the hydraulic pump, the first sensor connected to the controller and adapted to send a first signal to the controller via an inner control loop indicating the output of the hydraulic pump,h) a second sensor operatively coupled to the piston rod and configured to detect a position of the piston rod, the second sensor connected to the controller and adapted to send a second signal to the controller via an outer control loop indicating the position of the piston rod, wherein the controller is programmed with a desired profile of velocity of the piston over time, and programmed to instruct the hydraulic pump to move the piston according to the profile, process the first signal indicating the output of the hydraulic pump and the second signal indicating the position of the piston rod, determine a desired position value and a desired velocity value for the piston based on the desired profile, subtract an actual position value of the piston from the desired position value to determine a first difference and multiply the first difference by a first gain factor to generate a first multiplied value, subtract an actual velocity value of the piston from the desired velocity value to determine a second difference and multiply the second difference by a second gain factor to generate a second multiplied value, sum the first multiplied value and the second multiplied value to generate a sum value, generate a flow control command based on the sum value, and alter the instructions by sending the flow control command to the flow control mechanism via the inner control loop to cause the piston to more nearly follow the profile. 2. The apparatus of claim 1 wherein the controller is connected to the valve, the profile includes dwell periods in which the piston is not intended to be moving, and the controller is programmed to move the valve during the dwell periods. 3. The apparatus of claim 2 wherein the controller is programmed to delay the start of a movement of the valve until after the start of a dwell period. 4. The apparatus of claim 1 wherein the valve has a valve piston that closes against a downstream seat inside of a valve body, the face of the valve piston has a central area that contacts the seat when the valve is closed, the face of the valve piston also has an outer ring, the outer ring is recessed relative to the central area, and the back of the piston can be connected to the valve body downstream of the seat. 5. The apparatus of claim 4 wherein the piston is biased towards the closed position. 6. The apparatus of claim 1 wherein the piston and cylinder are made using corrosion resistant materials and low friction materials. 7. The apparatus of claim 1 wherein the hydraulic pump comprises a swash plate and the first signal indicates the angle of the swash plate. 8. A process comprising the steps of, a) providing a water pump, the water pump comprising a piston in a cylinder, the piston connected to a piston rod;b) providing a hydraulic pump connected to the piston rod such that a fluid flow output from the hydraulic pump causes the piston to move, the hydraulic pump comprising a flow control mechanism controllable to produce the fluid flow output;c) connecting the water pump to a membrane system such that movement of the piston causes feed water to flow to the membrane system;d) instructing the hydraulic pump to produce a fluid flow output predicted to cause the piston to move according to a predetermined profile of velocity over time;e) detecting a position of the flow control mechanism of the hydraulic pump to produce a first signal related to the actual fluid flow output of the hydraulic pump and sending the first signal to a controller via an inner control loop;f) detecting a position of the piston rod to produce a second signal related to the position of the piston and sending the second signal to the controller via an outer control loop;g) determining a desired position value and a desired velocity value for the piston based on the desired profile, subtracting an actual position value of the piston from the desired position value to determine a first difference and multiplying the first difference by a first gain factor to generate a first multiplied value, subtracting an actual velocity value of the piston from the desired velocity value to determine a second difference and multiplying the second difference by a second gain factor to generate a second multiplied value, summing the first multiplied value and the second multiplied value to generate a sum value, and generating a flow control command based on the sum value;h) modifying the instructions by sending the flow control command from the controller to the hydraulic pump via the inner control loop to cause the piston to more closely follow the profile. 9. The process of claim 8 further comprising a step of using the pressure of a brine produced in the membrane system to assist in causing the piston to move to cause the feed water to flow. 10. The process of claim 9 further comprising steps of providing a valve configured to selectively connect the brine to the piston and instructing the valve to be open when the profile indicates that the piston should be moving in a forward direction and to close when the profile indicates that the piston should be moving in a reverse direction. 11. The process of claim 10 wherein the profile includes dwell periods in which the piston is not intended to be moving, and wherein the valve is instructed to open or close during the dwell periods. 12. The process of claim 11 further wherein an instruction to open or close a valve during a dwell period is delayed relative to the start of the dwell period. 13. The process of claim 12 wherein the velocity profile includes a decrease in piston velocity towards the dwell periods and the valve is configured to move towards a closed position when the flow rate of water through the valve decreases. 14. The process of claim 8 wherein the hydraulic pump comprises a swash plate and the first signal related to the actual fluid flow output of the hydraulic pump is a signal indicating the angle of the swash plate. 15. The apparatus of claim 1 wherein the piston rod comprises a first rod connected to one face of the hydraulic piston and a second rod connected to the opposite face of the hydraulic piston. 16. The apparatus of claim 1 wherein the piston rod is connected to the piston by a connection rod.
Albright Charles Jere (919 N. Michigan Ave. Chicago IL 60610) Fitch ; Sr. Clifford E. (P.O. Box 221 South Holland IL 60473) Fitch ; Jr. Clifford E. (P.O. Box 221 South Holland IL 60473), Apparatus for cooking food in hot non-aqueous liquids under pressure.
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