CN-115574140-B - Hydraulic switching valve group for energy recovery device and working method

CN115574140BCN 115574140 BCN115574140 BCN 115574140BCN-115574140-B

Abstract

The invention relates to the technical field of sea water desalting equipment, and particularly discloses a hydraulic switching valve group for an energy recovery device and a working method. The energy recovery device comprises a first pressure-bearing pipe and a second pressure-bearing pipe which are arranged in parallel, one end of each pressure-bearing pipe is vertically communicated with one concentrated brine switching pipe, the hydraulic switching valve group comprises a first hydraulic switching valve, a second hydraulic switching valve and a third hydraulic switching valve, the first hydraulic switching valve is coaxially connected with the first pressure-bearing pipe through a first piston structure, the second hydraulic switching valve is coaxially connected with the second pressure-bearing pipe through a second piston structure, the hydraulic switching valve group is coaxially connected with the concentrated brine switching pipe through a third piston structure, the first or second hydraulic switching valve is used for transmitting high-pressure water flow energy corresponding to the pressure-bearing pipe to the third hydraulic switching valve, waterway switching of high-pressure concentrated brine in the concentrated brine switching pipe is realized through movement of the third piston structure, and the whole switching process is driven by water, so that the energy is environment-friendly and energy-saving.

Inventors

WANG SHENGHUI
SONG DAIWANG
XIAO YEXIANG
LIU SIHAN
WANG HAITAO
ZHOU CHONG
WANG CHENGPENG
WANG YUBIN
HUANG YUNFEI

Assignees

清华大学
自然资源部天津海水淡化与综合利用研究所

Dates

Publication Date: 20260508
Application Date: 20220922

Claims (7)

1. The hydraulic switching valve bank is characterized by comprising a first hydraulic switching valve, a second hydraulic switching valve and a third hydraulic switching valve, wherein the first hydraulic switching valve is coaxially connected with the first pressure-bearing pipe through a first piston structure, the second hydraulic switching valve is coaxially connected with the second pressure-bearing pipe through a second piston structure, the third hydraulic switching valve is coaxially connected with the strong brine switching pipe through a third piston structure, and the first or second hydraulic switching valve is used for transmitting high-pressure water flow energy of the corresponding pressure-bearing pipe to the third hydraulic switching valve and realizing waterway switching of high-pressure strong brine in the strong brine switching pipe through movement of the third piston structure; The first piston structure comprises two first piston blocks positioned in the first hydraulic switching valve, the two first piston blocks are separated by a certain distance and are connected into a whole through a first piston rod, one end of the first piston rod is positioned in the first hydraulic switching valve, the other end of the first piston rod is positioned in the first pressure-bearing pipe, a plurality of rows of first water inlets are formed in the first piston rod positioned in the first pressure-bearing pipe, so that seawater in the first pressure-bearing pipe enters the first piston rod through the first water inlets, and is led into the first hydraulic switching valve through a first water outlet formed in the first piston block close to the first pressure-bearing pipe; The first hydraulic switching valve is provided with two water inlets and water outlets, and the distance between the two water inlets and the water outlets is smaller than the distance between the two first piston blocks on the first piston structure.
2. The hydraulic switching valve group for the energy recovery device according to claim 1, wherein the second piston structure comprises two second piston blocks positioned in the second hydraulic switching valve, the two second piston blocks are separated by a certain distance and are connected into a whole through a second piston rod, one end of the second piston rod is positioned in the second hydraulic switching valve, the other end of the second piston rod is positioned in the second pressure-bearing pipe, a plurality of rows of second water inlet holes are formed in the second piston rod positioned in the second pressure-bearing pipe, and accordingly seawater in the second pressure-bearing pipe enters the second piston rod through the second water inlet holes and is guided into the second hydraulic switching valve through second water outlet holes formed in the second piston blocks close to the second pressure-bearing pipe.
3. The hydraulic switching valve block for an energy recovery device of claim 1, wherein the third piston structure comprises three third piston blocks integrally connected by a third piston rod, wherein one third piston block is positioned in the third hydraulic switching valve, and the other two third piston blocks are positioned in the strong brine switching pipe.
4. The hydraulic switching valve set for an energy recovery device according to claim 1, wherein an elastic structure contacting with the first piston structure is arranged in the first hydraulic switching valve, the second hydraulic switching valve has the same structure as the first hydraulic switching valve, and the third hydraulic switching valve is also provided with two water inlets and water outlets which are separated by a certain distance.
5. The hydraulic switching valve group for the energy recovery device of claim 1, wherein the first pressure-bearing pipe and the second pressure-bearing pipe are respectively provided with a low-pressure seawater inlet and a high-pressure seawater outlet at one end far away from the strong brine switching pipe.
6. The hydraulic switch valve set for an energy recovery device of claim 5, wherein the brine switch tube is provided with a high-pressure brine inlet and an upper low-pressure brine outlet, the high-pressure brine inlet is positioned between the two pressure-bearing tubes, and the two pressure-bearing tubes are positioned between the upper low-pressure brine outlet and the lower low-pressure brine outlet, so that the high-pressure brine enters the first pressure-bearing tube or the second pressure-bearing tube through the high-pressure brine inlet of the brine switch tube and is discharged from the low-pressure brine outlet in the form of low-pressure brine.
7. The method of operating a hydraulic switch valve block for an energy recovery device of claim 6, comprising the steps of: S1, pretreated low-pressure seawater enters a first pressure-bearing pipe through a low-pressure seawater inlet, high-pressure strong brine enters a strong brine switching pipe and is guided into the first pressure-bearing pipe filled with the low-pressure seawater through a third piston structure; S2, the high-pressure strong brine continuously pushes the first piston structure to move towards the direction of the first hydraulic switching valve, the pressure of the high-pressure strong brine is transmitted to the low-pressure seawater in the moving process, then the low-pressure seawater is pressurized and is discharged out of the device through a check valve arranged in a high-pressure seawater outlet; S3, when a first piston block with a first water outlet hole moves between two water inlet and outlet ports of a first hydraulic switching valve, high-pressure seawater in the first hydraulic switching valve enters a third hydraulic switching valve through one water inlet and outlet port and a corresponding pipeline, the high-pressure seawater pushes a third piston rod to move downwards for switching, a channel of high-pressure strong brine entering a first pressure-bearing pipe is cut off when the third piston block on the third piston rod, which is positioned in the strong brine switching pipe, moves along with the third piston block, and seawater in the third hydraulic switching valve is discharged into a second hydraulic switching valve through the other water inlet and outlet port on the third piston rod in the switching movement process of the third piston rod; S4, after the high-pressure strong brine is decompressed, the elastic structure in the first hydraulic switching valve rebounds, and along with the injection of the low-pressure seawater, the first piston structure discharges the low-pressure strong brine through one of the low-pressure strong brine outlets in the return process, the high-pressure strong brine entering the strong brine switching pipe is guided into the second pressure-bearing pipe, the low-pressure seawater entering the second pressure-bearing pipe is pressurized, and the circulation between the two pressurizing pipes is repeated.

Description

Hydraulic switching valve group for energy recovery device and working method Technical Field The invention relates to the technical field of sea water desalting equipment, and particularly discloses a hydraulic switching valve group for an energy recovery device and a working method. Background Along with the increase of drinking water demand and energy cost, the expandability and energy-saving design of the seawater reverse osmosis process make the process the first choice in the water-deficient areas worldwide. The seawater desalination process is to produce fresh water by utilizing seawater desalination, is an open source increment technology for realizing water resource utilization, can increase the total amount of fresh water, is not influenced by space time and climate, and can ensure stable water supply of coastal resident drinking water, industrial boiler water supplementing and the like. In the prior art, the energy of the high-pressure strong brine can be used for pressurizing the low-pressure sea water, the low-pressure sea water is filtered through a permeable membrane component, and the high-pressure strong brine is discharged after being depressurized to form the low-pressure strong brine, so that the aim of energy recovery is achieved. The switching valves sold in the market at present are often electromagnetic valves, and no hydraulic switching valve special for the sea water desalting equipment exists. Disclosure of Invention The patent provides a hydraulic switching valve group for an energy recovery device and a working method for solving the technical problems in the prior art. The technical scheme who adopts for solving the technical problem that exists among the known art is to this patent: The hydraulic switching valve bank comprises a first hydraulic switching valve, a second hydraulic switching valve and a third hydraulic switching valve, wherein the first pressure-bearing pipe and the second pressure-bearing pipe are arranged in parallel, one end of each pressure-bearing pipe is vertically communicated with one strong brine switching pipe, the first hydraulic switching valve is coaxially connected with the first pressure-bearing pipe through a first piston structure, the second hydraulic switching valve is coaxially connected with the second pressure-bearing pipe through a second piston structure, the hydraulic switching valve bank is coaxially connected with the strong brine switching pipe through a third piston structure, and the first hydraulic switching valve or the second hydraulic switching valve is used for transmitting high-pressure water flow energy of the corresponding pressure-bearing pipe to the third hydraulic switching valve and realizing waterway switching of high-pressure strong brine in the strong brine switching pipe through movement of the third piston structure. As the preferable technical scheme, the first piston structure comprises two first piston blocks positioned in the first hydraulic switching valve, the two first piston blocks are separated by a certain distance and are connected into a whole through a first piston rod, one end of the first piston rod is positioned in the first hydraulic switching valve, the other end of the first piston rod is positioned in the first pressure-bearing pipe, a plurality of rows of first water inlet holes are formed in the first piston rod positioned in the first pressure-bearing pipe, so that seawater in the first pressure-bearing pipe enters the first piston rod through the first water inlet holes, and is led into the first hydraulic switching valve through the first water outlet holes formed in the first piston blocks close to the first pressure-bearing pipe. As a preferable technical scheme, the second piston structure comprises two second piston blocks positioned in the second hydraulic switching valve, the two second piston blocks are separated by a certain distance and are connected into a whole through a second piston rod, one end of the second piston rod is positioned in the second hydraulic switching valve, the other end of the second piston rod is positioned in the second pressure-bearing pipe, a plurality of rows of second water inlet holes are formed in the second piston rod positioned in the second pressure-bearing pipe, so that seawater in the second pressure-bearing pipe enters the second piston rod through the second water inlet holes, and is led into the second hydraulic switching valve through second water outlet holes formed in the second piston blocks close to the second pressure-bearing pipe. As an optimized technical scheme, the third piston structure comprises three third piston blocks connected into a whole through a third piston rod, wherein one third piston block is positioned in a third hydraulic switching valve, and the other two third piston blocks are positioned in a strong brine switching pipe. The hydraulic control system comprises a first hydraulic switching valve, a second hydraulic swit