CN108434993B

CN108434993B - DTRO flow guide disc capable of generating longitudinal and transverse turbulence

Info

Publication number: CN108434993B
Application number: CN201810521351.5A
Authority: CN
Inventors: 蔡相宇; 张韦海; 王双; 张辉; 张庆福
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2018-05-28
Filing date: 2018-05-28
Publication date: 2020-07-17
Anticipated expiration: 2038-05-28
Also published as: CN108434993A

Abstract

The invention discloses a DTRO flow guide disc capable of generating longitudinal and transverse turbulence, which comprises a disc body, wherein two sides of the disc body are planes, a plurality of inward concave pits are distributed on the planes of the two sides of the disc body at intervals, and a plurality of outward convex salient points are distributed on the plane of the disc body between the adjacent pits. The flow guide disc disclosed by the invention generates longitudinal turbulence, the mass transfer effect is enhanced, the concentration polarization is reduced, the scaling risk is reduced, meanwhile, raw water can fluctuate up and down, the fluctuating force acts on the membrane bag, the membrane bag can generate disordered small vibration, the vibration can throw away the dirt blockage with large viscosity, the dirt blockage is taken away from the membrane column along with the turbulence generated by the salient points, the reduction of the effective membrane area caused by the fact that the surface of the membrane bag is covered by the dirt blockage is avoided, and the reduction of the water production flow caused by the reduction of the effective membrane area is avoided.

Description

DTRO flow guide disc capable of generating longitudinal and transverse turbulence

Technical Field

The invention belongs to the technical field of reverse osmosis membrane element manufacturing, and particularly relates to a disc tube type reverse osmosis (DTRO) diversion disc for treating high-concentration sewage and landfill leachate.

Background

DTRO is used for the treatment of high concentration sewage and landfill leachate, and has been accepted by the market, and compared with the conventional membrane process, the advantages of DTRO include: 1. the open flow channel can treat wastewater containing more colloid and suspended matters without excessively depending on pretreatment; 2. the flow channel of the module is wide, and the liquid runs in a turbulent flow in the membrane column under special hydraulic conditions, so that membrane fouling and blocking are not easy to occur; 3. the dirt blockage is easy to remove, and particularly, the biological dirt blockage removal effect is obvious; 4. the recovery rate is high; 5. the standard module series is flexible to assemble, DTRO is applied and matured gradually in the field of high-concentration sewage and landfill leachate treatment at present, and research find that the DTRO is applied a lot at present, but research and design on the internal structure of the DTRO are less. DTRO is through carrying out special design to the runner, increase the raw water and flow through the velocity of flow when membrane bag surface and guiding disc surface, make it form the torrent, the form of torrent can increase the trafficability characteristic of raw water, reduce dirty stifled possibility, nevertheless because DTRO is vertical, in operation intermittence period, can not avoid causing dirty stifled material to stop at membrane bag upper surface and guiding disc upper surface, finally form more stubborn dirty stifled layer, cause DTRO performance to descend by a wide margin, DTRO needs regularly to be maintained, the production on dirty stifled layer can increase maintenance frequency and maintenance cost.

Disclosure of Invention

In order to overcome the defects in the existing DTRO technology, the invention provides the flow guide disc which can reduce pollution blockage, improve mass transfer efficiency and obviously reduce maintenance frequency.

The technical scheme of the invention is as follows:

the utility model provides a can produce DTRO flow guide plate of vertical and horizontal torrent, includes the disk body, the both sides of disk body are the plane, its characterized in that, equal interval distribution has a plurality of sunken pits on the plane of the both sides of disk body, and distributes on the disk body plane between the adjacent pit has the bump of a plurality of evaginations.

Furthermore, the outer surface of the salient point is a spherical surface, and the inner surface of the concave pit is a spherical surface.

Furthermore, the bottoms of the salient points are all on the same plane, and the heights of the salient points are consistent; the upper edges of the pits are all on one plane, and the plane of the pits and the plane of the bottom of the salient point are the same plane.

Furthermore, the upper edges of the pits are smoothly transited to the plane of the plate body after being subjected to smooth fillets.

Furthermore, no intersection point exists between adjacent pits, and the convex points are distributed at the edges of the pits.

The pits in the flow guiding disc have the following functions: when the former water stream was through the pit, produce vertical torrent, vertical torrent reinforcing mass transfer effect, reduce concentration polarization, reduce the scale deposit risk, the former water can fluctuate from top to bottom simultaneously, undulant power is used in the membrane bag, the membrane bag can produce mixed and disorderly small amplitude vibrations, and vibrations can throw away the big dirty stifled thing of viscidity, the torrent that produces along with the bump, together take dirty stifled thing off-film post, avoid reducing because of the effective membrane area that the membrane bag surface was covered and is caused by dirty stifled thing, thereby avoid reducing the product water flow that causes because of effective membrane area.

The membrane column assembled by the flow guide disc shows more stable water production flow and water quality when treating raw water with the same concentration; when the membrane column assembled by the flow guide plate is operated for a long time, the membrane column assembled by the flow guide plate shows better tolerance than the traditional DTRO membrane column.

Drawings

Fig. 1 is a schematic structural view of a diaphragm of the present invention;

fig. 2 is a partially enlarged view of the diaphragm of the present invention (a schematic structural view of pits and bumps);

FIG. 3 is a graph showing the change in salt rejection (%) with time;

FIG. 4 is a graph of water production (L/h) versus time;

in the figure: (1) the concave pits, (2) the convex points, (3) the concentrated water turning channels, (4) the water production holes, (5) the water production channels, (6) the convex edges, and (7) the plane of the plate body.

Detailed Description

The present invention will be further described with reference to specific examples, but the present invention is not limited thereto.

Example 1

Referring to fig. 1, a DTRO flow guide plate capable of generating longitudinal and transverse turbulence comprises a plate body, wherein a concentrated water turning channel 3, a water production hole 4 and a water production channel 5 are arranged in the center of the plate body, and a raised edge 6 is arranged on the periphery of the plate body; the both sides of disk body are the plane, and equal interval distribution has a plurality of sunken pits 1 on the plane of the both sides of disk body, and distributes on the disk body plane between the adjacent pit 1 has a plurality of convex bumps 2. There is no intersection point between adjacent pits 1, and the bumps 2 are distributed at the edge of the pits. The bottoms of the salient points 2 are all on the same plane, and the heights of the salient points 2 are consistent; the upper edges of the pits 1 are all on one plane, and the plane where the bottom of the salient point 2 is located is the same plane; the upper edge of the pit 1 is smoothly transited to the plane of the plate body after passing through a smooth fillet; the outer surface of the salient point 1 is a spherical surface, and the inner surface of the concave pit 2 is a spherical surface.

Example 2

The membrane column of one 209 membrane bags is assembled by using the convex-point concave-pit type diversion disk in the embodiment 1, and the desalination rate and the water yield attenuation rate of the membrane column of one 209 membrane bags assembled by using the traditional type diversion disk are tested under the conditions of the same raw water condition and the same water inlet pressure (70 bar), a DTRO system runs for 8 hours every day and stops for 16 hours under the raw water condition: 30000us/cm sodium chloride at 25 ℃. The experiment was carried out for 10 weeks.

The desalination rate (%) and water yield (L/h) were varied with time as shown in fig. 3 and fig. 4. from the above experimental data, it can be seen that the DTRO membrane column assembled by the flow guide plates in the form of convex pits according to the present invention has a slower desalination rate attenuation and water yield attenuation than the conventional DTRO membrane column under the same experimental conditions.

In summary, under the same raw water condition and the same test pressure, the DTRO membrane column assembled by the diversion plate of the invention has a lower desalination rate attenuation rate and a lower water flux attenuation rate than the conventional DTRO membrane column, so that the DTRO membrane column assembled by the diversion plate of the invention has more obvious economic operation.

It will be appreciated by persons skilled in the art that the foregoing examples are merely exemplary of the invention and that various modifications, improvements or equivalent changes in the details of the embodiments and implementations of the invention may be made without departing from the scope of the invention.

Claims

1. A DTRO flow guide disc capable of generating longitudinal and transverse turbulence comprises a disc body, wherein two sides of the disc body are both planes, and the DTRO flow guide disc is characterized in that a plurality of sunken pits are distributed on the planes of the two sides of the disc body at intervals, and a plurality of convex salient points are distributed on the plane of the disc body between the adjacent pits; the outer surface of the salient point is a spherical surface, and the inner surface of the pit is a spherical surface;

the upper edges of the concave pits are smoothly transited to the plane of the plate body after passing through smooth fillets;

and no intersection point exists between the adjacent pits, and the convex points are distributed at the edges of the pits.

2. The DTRO flow guide disc capable of generating vertical and horizontal turbulence of claim 1, wherein the bottom of the convex points are all on one plane, and the heights of the convex points are consistent; the upper edges of the pits are all on one plane, and the plane of the pits and the plane of the bottom of the salient point are the same plane.