CN216764401U

CN216764401U - Low-pressure seawater membrane method desalination equipment

Info

Publication number: CN216764401U
Application number: CN202220141936.6U
Authority: CN
Inventors: 路传波; 袁荃; 况黎; 王俊; 杨国庆
Original assignee: Bifei Separation Membrane Dalian Co ltd
Current assignee: Bifei Separation Membrane Dalian Co ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-06-17
Anticipated expiration: 2032-01-19

Abstract

The utility model relates to low-pressure seawater desalination equipment by a membrane method, which comprises a bracket and a circulation system arranged on the bracket, wherein the circulation system comprises a frame fixed at the top of the bracket, and a first nanofiltration component, a second nanofiltration component, a third nanofiltration component, a fourth nanofiltration component, a fifth nanofiltration component and a sixth nanofiltration component which are fixed in the frame and sequentially distributed from top to bottom; the utility model obviously improves the practicability so as to effectively enlarge the application range.

Description

Low-pressure seawater desalination equipment by membrane method

Technical Field

The utility model relates to a low-pressure seawater desalination device by a membrane method.

Background

The process of obtaining fresh water from seawater is seawater desalination, the currently used seawater desalination methods mainly comprise a seawater freezing method, an electrodialysis method, a distillation method, a reverse osmosis method and an ammonium carbonate ion exchange method, and the reverse osmosis membrane method and the distillation method are the main methods in the desalination technology; the distillation method needs a large tank to store seawater, and then uses a large-capacity distillation tank to distill a certain amount of seawater in a centralized way, so that a large floor area is needed, and the distillation process needs continuous and high energy consumption, so that the distillation method is gradually eliminated; the reverse osmosis membrane method has small floor area and low energy consumption, so the reverse osmosis membrane method is more and more widely applied; the existing seawater desalination equipment adopting a reverse osmosis membrane method is in a single-inlet single-outlet mode, namely only one seawater inlet and one fresh water outlet are arranged, so that classified output cannot be realized according to the requirements of fresh water quality and flow, the practicability is poor, the application range is small, and further improvement is needed.

SUMMERY OF THE UTILITY MODEL

In view of the current situation of the prior art, the technical problem to be solved by the present invention is to provide a low-pressure seawater desalination apparatus with membrane method, which can select fresh water outlets according to different requirements of fresh water output quality and output flow, thereby significantly improving the practicability and effectively expanding the application range.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a low pressure sea water embrane method desalination equipment, includes the bracket and locates the circulation system on the bracket, its characterized in that, circulation system is including fixing the frame at the bracket top and fixing in the frame and from last first nanofiltration subassembly, second nanofiltration subassembly, third nanofiltration subassembly, fourth nanofiltration subassembly, fifth nanofiltration subassembly and the sixth nanofiltration subassembly that down distributes in proper order, first nanofiltration subassembly includes four horizontal settings and from the past backward first nanofiltration membrane pipes that distribute in proper order, second nanofiltration subassembly includes four horizontal settings and from the past backward second nanofiltration membrane pipes that distribute in proper order, third nanofiltration subassembly includes four horizontal settings and from the past backward third nanofiltration membrane pipes that distribute in proper order, fourth nanofiltration subassembly includes four horizontal settings and nanofiltration from the past backward fourth nanofiltration membrane pipes that distribute in proper order, fifth nanofiltration subassembly includes four horizontal settings and from the past backward fifth nanofiltration membrane pipes that distribute in proper order, the sixth nanofiltration assembly comprises four sixth nanofiltration membrane pipes which are transversely arranged and sequentially distributed from front to back, the circulation system also comprises a first sea water pipe, a second sea water pipe, a first fresh water pipe, a second fresh water pipe, a third fresh water pipe, a fourth fresh water pipe, a first fresh water branch pipe and a second fresh water branch pipe, the first nanofiltration membrane pipe, the second nanofiltration membrane pipe, the third nanofiltration membrane pipe, the fourth nanofiltration membrane pipe and the fifth nanofiltration membrane pipe are connected in parallel on the first sea water pipe, the right side liquid outlets of the first nanofiltration membrane pipe and the second nanofiltration membrane pipe are connected in parallel on the first fresh water pipe, the right side liquid outlets of the third nanofiltration membrane pipe, the fourth nanofiltration membrane pipe and the fifth nanofiltration membrane pipe are connected in parallel on the second fresh water pipe, the right side liquid outlets of the rest of first nanofiltration membrane tubes and the rest of second nanofiltration membrane tubes are connected in parallel to a third fresh water pipe, one end of each first fresh water branch pipe and one end of each second fresh water branch pipe are connected in parallel to a fourth fresh water pipe, the other ends of the first fresh water branch pipe and the second fresh water branch pipe are closed, the right side liquid outlets of the rest of third nanofiltration membrane tubes and the rest of fourth nanofiltration membrane tubes are connected in parallel to the first fresh water branch pipe, the right side liquid outlets of the rest of fifth nanofiltration membrane tubes and the rest of sixth nanofiltration membrane tubes are connected in parallel to the second fresh water branch pipe, the liquid inlets of the last first nanofiltration membrane tube, the last second nanofiltration membrane tube, the last third nanofiltration membrane tube, the last fourth nanofiltration membrane tube, the last fifth nanofiltration membrane tube and the last sixth nanofiltration membrane tube are connected in parallel to the second fresh water pipe A seawater branch pipe is further arranged between one first nanofiltration membrane pipe, one second nanofiltration membrane pipe, one third nanofiltration membrane pipe, one fourth nanofiltration membrane pipe, one fifth nanofiltration membrane pipe and one sixth nanofiltration membrane pipe which are positioned in the same vertical direction, liquid inlets of the first nanofiltration membrane pipe, the second nanofiltration membrane pipe, the third nanofiltration membrane pipe, the fourth nanofiltration membrane pipe, the fifth nanofiltration membrane pipe and the sixth nanofiltration membrane pipe which are positioned in the same vertical direction are all connected in parallel to the corresponding seawater branch pipe, one end of each seawater branch pipe is connected in parallel to the second seawater pipe and is positioned at the upstream side of the liquid inlets of the last first nanofiltration membrane pipe, the last second nanofiltration membrane pipe, the last third nanofiltration membrane pipe, the last fourth nanofiltration membrane pipe, the last fifth nanofiltration membrane pipe and the last sixth nanofiltration membrane pipe, each other end of the seawater branch pipe is sealed, one end of each of the first seawater pipe, the second seawater pipe, the first fresh water pipe, the second fresh water pipe, the third fresh water pipe and the fourth fresh water pipe is sealed, and the other end of each of the first seawater pipe, the second seawater pipe, the first fresh water pipe, the second fresh water pipe, the third fresh water pipe and the fourth fresh water pipe is opened.

Preferably, the first fresh water pipe is further inserted with a first short connection pipe, a first sampling pipe and a pressure measuring pipe which are sequentially arranged along the liquid flowing direction, the first short connection pipe, the first sampling pipe and the pressure measuring pipe are all arranged on the downstream side of the liquid outlet of the first nanofiltration membrane pipe on the foremost side and the second nanofiltration membrane pipe on the foremost side, and the first sampling pipe is further provided with a first valve.

Preferably, the circulation system further comprises a third fresh water branch pipe, one end of the third fresh water branch pipe is inserted into the third fresh water pipe and is located at the downstream side of the liquid outlets of each of the rest first nanofiltration membrane pipes and each of the rest second nanofiltration membrane pipes, the other end of the third fresh water branch pipe is closed, a second sampling pipe and a second short connection pipe are further inserted into the third fresh water branch pipe, and a second valve is further arranged on the second sampling pipe.

Preferably, the circulation system further comprises a first bypass pipe, one end of the first bypass pipe is inserted into the second seawater pipe and is located at the upstream side of each seawater branch pipe.

Preferably, the circulation system further comprises a second side connection pipe and a third side connection pipe, wherein one end of the second side connection pipe is inserted into the first seawater pipe and is positioned at the upstream side of the liquid inlet of the first nanofiltration membrane pipe at the frontmost side, the second nanofiltration membrane pipe at the frontmost side, the third nanofiltration membrane pipe at the frontmost side, the fourth nanofiltration membrane pipe at the frontmost side and the fifth nanofiltration membrane pipe at the frontmost side; one end of the third side connecting pipe is inserted into the second side connecting pipe.

Preferably, the flow-through system further comprises a first pressure equalizing pipe, left side liquid outlets of the first nanofiltration membrane pipe at the frontmost side, the second nanofiltration membrane pipe at the frontmost side, the third nanofiltration membrane pipe at the frontmost side, the fourth nanofiltration membrane pipe at the frontmost side and the fifth nanofiltration membrane pipe at the frontmost side are connected in parallel to the first pressure equalizing pipe, and two ends of the first pressure equalizing pipe are closed.

Preferably, a first pressure equalizing branch pipe is further arranged between the first nanofiltration assembly and the second nanofiltration assembly, a second pressure equalizing branch pipe is further arranged between the third nanofiltration assembly and the fourth nanofiltration assembly, a third pressure equalizing branch pipe is further arranged between the fifth nanofiltration assembly and the sixth nanofiltration assembly, left side liquid outlets of the rest of the first nanofiltration membrane pipes and the rest of the second nanofiltration membrane pipes are connected in parallel to the first pressure equalizing branch pipe, left side liquid outlets of the rest of the third nanofiltration membrane pipes and the rest of the fourth nanofiltration membrane pipes are connected in parallel to the second pressure equalizing branch pipe, and left side liquid outlets of the rest of the fifth nanofiltration membrane pipes and the rest of the sixth nanofiltration membrane pipes are connected in parallel to the third pressure equalizing branch pipe.

Preferably, the circulation system further comprises a second pressure equalizing pipe, one end of each of the first pressure equalizing branch pipe, the second pressure equalizing branch pipe and the third pressure equalizing branch pipe is connected in parallel to the second pressure equalizing pipe, the other end of each of the first pressure equalizing branch pipe, the second pressure equalizing branch pipe and the third pressure equalizing branch pipe is sealed, and two ends of the second pressure equalizing pipe are sealed.

Compared with the prior art, the utility model has the advantages that: the utility model has two seawater inlets and four fresh water outlets to realize a multi-inlet and multi-outlet mode, so that the fresh water outlets can be selected in a targeted manner according to different requirements of fresh water output quality and output flow, and further, the practicability is obviously improved to effectively expand the application range.

Drawings

FIG. 1 is a right front side structural view of the present invention;

fig. 2 is a left rear side structural view of the present invention.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the utility model have been omitted.

As shown in fig. 1-2, a low-pressure seawater desalination device by membrane method comprises a bracket 1 and a circulation system arranged on the bracket 1, wherein the circulation system comprises a frame 2 fixed on the top of the bracket 1, and a first nanofiltration component, a second nanofiltration component, a third nanofiltration component, a fourth nanofiltration component, a fifth nanofiltration component and a sixth nanofiltration component which are fixed in the frame 2 and sequentially distributed from top to bottom, the first nanofiltration component comprises four first nanofiltration membrane tubes 3 which are transversely arranged and sequentially distributed from front to back, the second nanofiltration component comprises four second nanofiltration membrane tubes 23 which are transversely arranged and sequentially distributed from front to back, the third nanofiltration component comprises four third nanofiltration membrane tubes 15 which are transversely arranged and sequentially distributed from front to back, the fourth nanofiltration component comprises four fourth nanofiltration membrane tubes 25 which are transversely arranged and sequentially distributed from front to back, the fifth nanofiltration component comprises four fifth nanofiltration membrane tubes 26 which are transversely arranged and sequentially distributed from front to back, the sixth nanofiltration assembly comprises four sixth nanofiltration membrane pipes 27 which are transversely arranged and sequentially distributed from front to back, the circulation system also comprises a first sea water pipe 12, a second sea water pipe 18, a first fresh water pipe 4, a second fresh water pipe 14, a third fresh water pipe 5, a fourth fresh water pipe 16, a first fresh water branch pipe 17 and a second fresh water branch pipe 28, the liquid inlets of the first nanofiltration membrane pipe 3 at the forefront side, the second nanofiltration membrane pipe 23 at the forefront side, the third nanofiltration membrane pipe 15 at the forefront side, the fourth nanofiltration membrane pipe 25 at the forefront side and the fifth nanofiltration membrane pipe 26 at the forefront side are all connected in parallel on the first sea water pipe 12, the liquid outlets at the right sides of the first nanofiltration membrane pipe 3 at the forefront side and the second nanofiltration membrane pipe 23 at the forefront side are all connected in parallel on the first sea water pipe 4, the third nanofiltration membrane pipe 15 at the forefront side, the fourth nanofiltration membrane pipe 25 at the forefront side and the fifth nanofiltration membrane pipe 26 at the right side are all connected in parallel on the second fresh water pipe 14, the right side liquid outlets of the rest of the first nanofiltration membrane pipes 3 and the rest of the second nanofiltration membrane pipes 23 are connected in parallel to the third fresh water pipe 5, one end of each of the first fresh water branch pipes 17 and one end of each of the second fresh water branch pipes 28 are connected in parallel to the fourth fresh water pipe 16, the other end of each of the first fresh water branch pipes 17 and the other end of each of the second fresh water branch pipes 28 are closed, the right side liquid outlets of the rest of the third nanofiltration membrane pipes 15 and the rest of the fourth nanofiltration membrane pipes 25 are connected in parallel to the first fresh water branch pipe 17, the right side liquid outlets of the rest of the fifth nanofiltration membrane pipes 26 and the rest of the sixth nanofiltration membrane pipes 27 are connected in parallel to the second fresh water branch pipes 28, the nanofiltration liquid inlets of the last one first nanofiltration membrane pipe 3, the last one second nanofiltration membrane pipe 23, the last one third nanofiltration membrane pipe 15, the last one fourth nanofiltration membrane pipe 25, the last fifth nanofiltration membrane pipe 26 and the last sixth nanofiltration membrane pipe 27 are connected in parallel to the second sea water pipe 18, a seawater branch pipe 19 is arranged among a first nanofiltration membrane pipe 3, a second nanofiltration membrane pipe 23, a third nanofiltration membrane pipe 15, a fourth nanofiltration membrane pipe 25, a fifth nanofiltration membrane pipe 26 and a sixth nanofiltration membrane pipe 27 which are positioned in the same vertical direction, liquid inlets of the first nanofiltration membrane pipe 3, the second nanofiltration membrane pipe 23, the third nanofiltration membrane pipe 15, the fourth nanofiltration membrane pipe 25, the fifth nanofiltration membrane pipe 26 and the sixth nanofiltration membrane pipe 27 which are positioned in the same vertical direction are all connected in parallel on the corresponding seawater branch pipe 19, one end of each seawater branch pipe 19 is connected in parallel on the second seawater pipe 18 and is positioned at the upstream side of the nanofiltration liquid inlet of the first nanofiltration membrane pipe 3 at the last side, the second nanofiltration membrane pipe 23 at the last side, the third nanofiltration membrane pipe 15 at the last side, the fourth nanofiltration membrane pipe 25 at the last side, the fifth nanofiltration membrane pipe 26 at the last side and the sixth nanofiltration membrane pipe 27 at the last side, the other end of each seawater branch pipe 19 is closed, one end of each of the first seawater pipe 12, the second seawater pipe 18, the first fresh water pipe 4, the second fresh water pipe 14, the third fresh water pipe 5 and the fourth fresh water pipe 16 is closed, and the other end of each of the first seawater pipe 12, the second seawater pipe 18, the first fresh water pipe 4, the second fresh water pipe 14, the third fresh water pipe 5 and the fourth fresh water pipe 16 is open.

The first fresh water pipe 4 is also inserted with a first short connecting pipe 29, a first sampling pipe 9 and a pressure measuring pipe 30 which are sequentially arranged along the liquid flowing direction, the first short connecting pipe 29, the first sampling pipe 9 and the pressure measuring pipe 30 are all arranged at the downstream side of the liquid outlet of the first nanofiltration membrane pipe 3 at the foremost side and the second nanofiltration membrane pipe 23 at the foremost side, and the first sampling pipe 9 is also provided with a first valve 10.

The circulation system further comprises a third fresh water branch pipe 6, one end of the third fresh water branch pipe 6 is inserted into the third fresh water pipe 5 and is positioned at the downstream side of the liquid outlets of each of the rest first nanofiltration membrane pipes 3 and each of the rest second nanofiltration membrane pipes 23, the other end of the third fresh water branch pipe 6 is closed, a second sampling pipe 7 and a second short connection pipe 31 are further inserted into the third fresh water branch pipe 6, and a second valve 8 is further arranged on the second sampling pipe 7.

The flow-through system further comprises a first bypass pipe 20, one end of the first bypass pipe 20 being plugged onto the second seawater pipe 18 and located at the upstream side of each seawater branch pipe 19.

The circulation system also comprises a second side connection pipe 21 and a third side connection pipe 22, wherein one end of the second side connection pipe 21 is inserted on the first seawater pipe 12 and is positioned at the upstream side of the liquid inlet of a first nanofiltration membrane pipe 3 at the frontmost side, a second nanofiltration membrane pipe 23 at the frontmost side, a third nanofiltration membrane pipe 15 at the frontmost side, a fourth nanofiltration membrane pipe 25 at the frontmost side and a fifth nanofiltration membrane pipe 26 at the frontmost side; one end of the third bypass pipe 22 is inserted into the second bypass pipe 21.

The circulating system also comprises a first pressure equalizing pipe 24, a first nanofiltration membrane pipe 3 at the foremost side, a second nanofiltration membrane pipe 23 at the foremost side, a third nanofiltration membrane pipe 15 at the foremost side, a fourth nanofiltration membrane pipe 25 at the foremost side and a left liquid outlet of a fifth nanofiltration membrane pipe 26 at the foremost side are connected in parallel on the first pressure equalizing pipe 24, and two ends of the first pressure equalizing pipe 24 are closed.

First pressure equalizing branch pipes 11 are further arranged between the first nanofiltration assembly and the second nanofiltration assembly, second pressure equalizing branch pipes 32 are further arranged between the third nanofiltration assembly and the fourth nanofiltration assembly, third pressure equalizing branch pipes 33 are further arranged between the fifth nanofiltration assembly and the sixth nanofiltration assembly, left side liquid outlets of each of the rest first nanofiltration membrane pipes 3 and each of the rest second nanofiltration membrane pipes 23 are connected in parallel to the first pressure equalizing branch pipes 11, left side liquid outlets of each of the rest third nanofiltration membrane pipes 15 and each of the rest fourth nanofiltration membrane pipes 25 are connected in parallel to the second pressure equalizing branch pipes 32, and left side liquid outlets of each of the rest fifth nanofiltration membrane pipes 26 and each of the rest sixth nanofiltration membrane pipes 27 are connected in parallel to the third pressure equalizing branch pipes 33.

The circulation system further comprises a second pressure equalizing pipe 13, one ends of the first pressure equalizing branch pipe 11, the second pressure equalizing branch pipe 32 and the third pressure equalizing branch pipe 33 are connected in parallel to the second pressure equalizing pipe 13, the other ends of the first pressure equalizing branch pipe 11, the second pressure equalizing branch pipe 32 and the third pressure equalizing branch pipe 33 are sealed, and two ends of the second pressure equalizing pipe 13 are sealed.

The working principle is as follows:

low-pressure seawater is introduced into an open end of a first seawater pipe 12, and then enters a first nanofiltration membrane pipe 3 at the foremost side, a second nanofiltration membrane pipe 23 at the foremost side, a third nanofiltration membrane pipe 15 at the foremost side, a fourth nanofiltration membrane pipe 25 at the foremost side and a fifth nanofiltration membrane pipe 26 at the foremost side for desalination, fresh water discharged from the first nanofiltration membrane pipe 3 at the foremost side and the second nanofiltration membrane pipe 23 at the foremost side enters a first fresh water pipe 4 and is discharged outwards through the open end of the first fresh water pipe 4 to realize desalination of the first path, a pressure gauge can be installed at the end of a pressure measuring pipe 30 to monitor a pressure value in the first fresh water pipe 4, after a first valve 10 is opened, fresh water in the first fresh water pipe 4 can be discharged outwards through a first sampling pipe 9 by a certain amount for sampling, when the open end of the first fresh water pipe 4 is blocked, the fresh water in the first fresh-water pipe 4 can be discharged to the outside through the first nipple 29; if the open end of the first sea water pipe 12 is blocked, the low pressure sea water may enter the first sea water pipe 12 through the other end of the second bypass pipe 21 or the third bypass pipe 22.

The low-pressure seawater is introduced into the open end of the second seawater pipe 18, and then enters into the last first nanofiltration membrane pipe 3, the last second nanofiltration membrane pipe 23, the last third nanofiltration membrane pipe 15, the last fourth nanofiltration membrane pipe 25, the last fifth nanofiltration membrane pipe 26 and the last sixth nanofiltration membrane pipe 27 for desalination, and simultaneously enters into the rest first nanofiltration membrane pipe 3, second nanofiltration membrane pipe 23, third nanofiltration membrane pipe 15, fourth nanofiltration membrane pipe 25, fifth nanofiltration membrane pipe 26 and sixth nanofiltration membrane pipe 27 for desalination through each seawater branch pipe 19.

Fresh water coming out of the frontmost one third nanofiltration membrane pipe 15, the frontmost one fourth nanofiltration membrane pipe 25 and the frontmost one fifth nanofiltration membrane pipe 26 enters the second fresh water pipe 14 and is discharged outwards through the open end to realize the second path of desalination. A first fresh water branch pipe 17 and a second fresh water branch pipe 28

Fresh water coming out of each of the rest first nanofiltration membrane pipes 3 and each of the rest second nanofiltration membrane pipes 23 enters the third fresh water pipe 5 and is discharged outwards through the open end of the third fresh water pipe 5 to realize desalination in a third way; after the second valve 8 is opened, the fresh water in the third fresh water pipe 5 can be discharged out through the second sampling pipe 7 by a certain amount for sampling; if the open end of the third fresh-water pipe 5 is blocked, the fresh water in the third fresh-water pipe 5 can be discharged to the outside through the third fresh-water branch pipe 6 and the second short-connection pipe 31.

The fresh water from each of the rest of the third nanofiltration membrane pipes 15 and each of the rest of the fourth nanofiltration membrane pipes 25 enters the first fresh water branch pipe 17 and then enters the fourth fresh water pipe 16; the fresh water from each of the remaining fifth nanofiltration membrane pipes 26 and each of the remaining sixth nanofiltration membrane pipes 27 enters the second fresh water branch pipe 28, and then enters the fourth fresh water pipe 16; the fresh water in the fourth fresh water pipe 16 is discharged outwards through the open end of the fourth fresh water pipe 16 to realize the fourth way of desalination.

Fresh water pressure values in a first nanofiltration membrane pipe 3 at the frontmost side, a second nanofiltration membrane pipe 23 at the frontmost side, a third nanofiltration membrane pipe 15 at the frontmost side, a fourth nanofiltration membrane pipe 25 at the frontmost side and a fifth nanofiltration membrane pipe 26 at the frontmost side are mutually balanced through a first pressure equalizing pipe 24 so as to be beneficial to smooth discharge of fresh water; fresh water pressure values in the rest of the first nanofiltration membrane pipes 3 and the rest of the second nanofiltration membrane pipes 23 are balanced by the first pressure equalizing branch pipes 11, fresh water pressure values in the rest of the third nanofiltration membrane pipes 15 and the rest of the fourth nanofiltration membrane pipes 25 are balanced by the second pressure equalizing branch pipes 32, and fresh water pressure values in the rest of the fifth nanofiltration membrane pipes 26 and the rest of the sixth nanofiltration membrane pipes 27 are balanced by the third pressure equalizing branch pipes 33; and the fresh water pressure values in the first pressure equalizing branch pipe 11, the second pressure equalizing branch pipe 32 and the third pressure equalizing branch pipe 33 are mutually balanced through the second pressure equalizing pipe 13 so as to be beneficial to smooth discharge of fresh water.

The utility model has two seawater inlets and four fresh water outlets to realize a multi-inlet and multi-outlet mode, so that the fresh water outlets can be selected in a targeted manner according to different requirements of fresh water output quality and output flow, and further, the practicability is obviously improved to effectively expand the application range.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a low pressure sea water embrane method desalination equipment, includes the bracket and locates the circulation system on the bracket, its characterized in that, circulation system is including fixing the frame at the bracket top and fixing in the frame and from last first nanofiltration subassembly, second nanofiltration subassembly, third nanofiltration subassembly, fourth nanofiltration subassembly, fifth nanofiltration subassembly and the sixth nanofiltration subassembly that down distributes in proper order, first nanofiltration subassembly includes four horizontal settings and from the past backward first nanofiltration membrane pipes that distribute in proper order, second nanofiltration subassembly includes four horizontal settings and from the past backward second nanofiltration membrane pipes that distribute in proper order, third nanofiltration subassembly includes four horizontal settings and from the past backward third nanofiltration membrane pipes that distribute in proper order, fourth nanofiltration subassembly includes four horizontal settings and nanofiltration from the past backward fourth nanofiltration membrane pipes that distribute in proper order, fifth nanofiltration subassembly includes four horizontal settings and from the past backward fifth nanofiltration membrane pipes that distribute in proper order, the sixth nanofiltration assembly comprises four sixth nanofiltration membrane pipes which are transversely arranged and sequentially distributed from front to back, the circulation system further comprises a first sea water pipe, a second sea water pipe, a first fresh water pipe, a second fresh water pipe, a third fresh water pipe, a fourth fresh water pipe, a first fresh water branch pipe and a second fresh water branch pipe, the first nanofiltration membrane pipe at the foremost side, the second nanofiltration membrane pipe at the foremost side, the third nanofiltration membrane pipe at the foremost side, the fourth nanofiltration membrane pipe at the foremost side and the fifth nanofiltration membrane pipe at the foremost side have liquid inlets which are all connected in parallel to the first sea water pipe, the first nanofiltration membrane pipe at the foremost side and the second nanofiltration membrane pipe at the foremost side have right-side liquid outlets which are all connected in parallel to the first fresh water pipe, the third nanofiltration membrane pipe at the foremost side, the fourth nanofiltration membrane pipe at the foremost side and the fifth nanofiltration membrane pipe at the foremost side have right-side liquid outlets which are all connected in parallel to the second fresh water pipe, the right side liquid outlets of the rest of the first nanofiltration membrane pipes and the rest of the second nanofiltration membrane pipes are connected in parallel to a third fresh water pipe, one end of each of the first fresh water branch pipes and one end of each of the second fresh water branch pipes are connected in parallel to a fourth fresh water pipe, the other ends of the first fresh water branch pipes and the second fresh water branch pipes are closed, the right side liquid outlets of the rest of the third nanofiltration membrane pipes and the rest of the fourth nanofiltration membrane pipes are connected in parallel to the first fresh water branch pipe, the right side liquid outlets of the rest of the fifth nanofiltration membrane pipes and the rest of the sixth nanofiltration membrane pipes are connected in parallel to the second fresh water branch pipe, and the liquid inlets of the last one of the first nanofiltration membrane pipes, the last one of the second nanofiltration membrane pipes, the last one of the third nanofiltration membrane pipes, the last one of the fourth nanofiltration membrane pipes, the last one of the fifth nanofiltration membrane pipes and the last one of the sixth nanofiltration membrane pipes are connected in parallel to a second fresh water pipe A seawater branch pipe is further arranged between one first nanofiltration membrane pipe, one second nanofiltration membrane pipe, one third nanofiltration membrane pipe, one fourth nanofiltration membrane pipe, one fifth nanofiltration membrane pipe and one sixth nanofiltration membrane pipe which are positioned in the same vertical direction, liquid inlets of the first nanofiltration membrane pipe, the second nanofiltration membrane pipe, the third nanofiltration membrane pipe, the fourth nanofiltration membrane pipe, the fifth nanofiltration membrane pipe and the sixth nanofiltration membrane pipe which are positioned in the same vertical direction are all connected in parallel to the corresponding seawater branch pipe, one end of each seawater branch pipe is connected in parallel to the second seawater pipe and is positioned at the upstream side of the liquid inlets of the last first nanofiltration membrane pipe, the last second nanofiltration membrane pipe, the last third nanofiltration membrane pipe, the last fourth nanofiltration membrane pipe, the last fifth nanofiltration membrane pipe and the last sixth nanofiltration membrane pipe, each other end of the seawater branch pipe is sealed, one end of each of the first seawater pipe, the second seawater pipe, the first fresh water pipe, the second fresh water pipe, the third fresh water pipe and the fourth fresh water pipe is sealed, and the other end of each of the first seawater pipe, the second seawater pipe, the first fresh water pipe, the second fresh water pipe, the third fresh water pipe and the fourth fresh water pipe is opened.

2. The low-pressure seawater desalination equipment according to claim 1, wherein a first short connection pipe, a first sampling pipe and a pressure measuring pipe are sequentially inserted into the first fresh water pipe along a liquid flowing direction, the first short connection pipe, the first sampling pipe and the pressure measuring pipe are all arranged on a first nanofiltration membrane pipe on the foremost side and on the downstream side of a liquid outlet of a second nanofiltration membrane pipe on the foremost side, and a first valve is further arranged on the first sampling pipe.

3. The low-pressure seawater membrane process desalination equipment as claimed in claim 2, wherein the flow-through system further comprises a third fresh water branch pipe, one end of the third fresh water branch pipe is inserted into the third fresh water pipe and is located at a downstream side of the liquid outlets of each of the rest first nanofiltration membrane pipes and each of the rest second nanofiltration membrane pipes, the other end of the third fresh water branch pipe is closed, the third fresh water branch pipe is further inserted with a second sampling pipe and a second short connection pipe, and the second sampling pipe is further provided with a second valve.

4. The low pressure seawater membrane process desalination apparatus of claim 3 wherein the flow-through system further comprises a first bypass pipe, one end of the first bypass pipe is plugged into the second seawater pipe and is located at the upstream side of each seawater branch pipe.

5. The low-pressure seawater membrane process desalination apparatus according to claim 4, wherein the flow-through system further comprises a second side connection pipe and a third side connection pipe, one end of the second side connection pipe is inserted into the first seawater pipe and is located at an upstream side of the liquid inlets of a first nanofiltration membrane pipe at the frontmost side, a second nanofiltration membrane pipe at the frontmost side, a third nanofiltration membrane pipe at the frontmost side, a fourth nanofiltration membrane pipe at the frontmost side and a fifth nanofiltration membrane pipe at the frontmost side; one end of the third side connecting pipe is inserted into the second side connecting pipe.

6. The low-pressure seawater membrane method desalination equipment as defined in claim 5, wherein the flow-through system further comprises a first pressure equalizing pipe, and left side liquid outlets of a frontmost one of the first nanofiltration membrane pipes, a frontmost one of the second nanofiltration membrane pipes, a frontmost one of the third nanofiltration membrane pipes, a frontmost one of the fourth nanofiltration membrane pipes and a frontmost one of the fifth nanofiltration membrane pipes are connected in parallel to the first pressure equalizing pipe, and both ends of the first pressure equalizing pipe are closed.

7. The low-pressure seawater desalination equipment by membrane method according to claim 6, a first pressure equalizing branch pipe is arranged between the first nanofiltration component and the second nanofiltration component, a second pressure equalizing branch pipe is arranged between the third nanofiltration component and the fourth nanofiltration component, a third pressure equalizing branch pipe is arranged between the fifth nanofiltration component and the sixth nanofiltration component, the left liquid outlets of the rest first nanofiltration membrane pipes and the rest second nanofiltration membrane pipes are connected in parallel on the first pressure equalizing branch pipe, the left liquid outlets of the rest third nanofiltration membrane pipes and the rest fourth nanofiltration membrane pipes are connected in parallel on the second pressure equalizing branch pipe, the left liquid outlets of the rest fifth nanofiltration membrane pipes and the rest sixth nanofiltration membrane pipes are connected in parallel on the third pressure equalizing branch pipe.

8. A low-pressure seawater membrane process desalination equipment as defined in claim 7, wherein the circulation system further comprises a second pressure equalizing pipe, one end of the first pressure equalizing branch pipe, one end of the second pressure equalizing branch pipe and one end of the third pressure equalizing branch pipe are connected in parallel with the second pressure equalizing pipe, the other end of the first pressure equalizing branch pipe, the other end of the second pressure equalizing branch pipe and the other end of the third pressure equalizing branch pipe are closed, and both ends of the second pressure equalizing pipe are closed.