WO2016054939A1

WO2016054939A1 - Tube having spiral protrusion on inner wall and photobioreactor thereof

Info

Publication number: WO2016054939A1
Application number: PCT/CN2015/084901
Authority: WO
Inventors: 胡强; 迟庆雷
Original assignee: 国家开发投资公司; 中国电子工程设计院
Priority date: 2014-10-10
Filing date: 2015-07-23
Publication date: 2016-04-14
Also published as: CN104263646A

Abstract

Provided in the application is a tube for a microalgae photobioreactor; a protrusion is provided on the inner wall of the tube and spirally and rotationally extends axially along the tube, such that under an equivalent condition, an algae solution can conduct self-stirring while flowing and be in a state of turbulence, thus avoiding sedimentation and algae accumulation; the structure allows the algae solution to flow through the tube in a lower flow rate, such that the energy consumption for circulating conveyance of a system is saved, and the staying time of the algae solution in the tube can be increased, and the exposure time of the algae solution to light is increased, thus improving growth efficiency.

Description

Pipe with spiral protrusion on inner wall and its photobioreactor

Technical field

The present application relates to the field of photobioreactors for cultivating photosynthetic microorganisms or photosynthetic plant tissue cells, and in particular to a tube having spiral projections on its inner wall.

Background technique

Microalgae cells are rich in sugar, protein, fat, vitamins, pigments and biologically active substances, and trace elements such as high value-added biological substances, and are becoming an important material source for human food, medicine, dyes, and fine chemicals. Broad application prospects.

The core of microalgae large-scale culture is photobioreactor, and the inner wall of the tube used for cultivating algae is a smooth circular inner surface. The algae liquid will stratify and settle during the flow, and the flow rate is too fast, which reduces algae and light. The contact time greatly reduces the growth efficiency.

Summary of the invention

The invention solves the problem that the algae liquid in the tube will settle at a low flow rate through the tube with the spiral protrusion on the inner wall, so that the algae liquid can obtain a good turbulent state during the flow process and create better growth conditions.

The present application provides a tube having a spiral protrusion on the inner wall, characterized in that the inner wall of the tube has a projection, and the protrusion extends in a spiral shape along the axial direction of the tube.

The direction of rotation of the spiral protrusion may be a left helix and/or a right helix, a pitch of ≥1 mm, a helix angle of ≥0°, and an angular velocity of ≥0°. By controlling the direction of the spiral of the convexity, the flow direction of the fluid is changed, and the turbulent flow is better formed, so that the algae liquid can fully receive the light and grow rapidly. When the tube has both left and right spiral transitions, it has a better effect on forming turbulence than a single direction spiral.

The cross-sectional shape of the tube may be circular, rectangular, elliptical or petal shaped.

The shape of the protrusion can be approximated as a rectangle, a triangle, a circle, a semicircle, or a trapezoid. For the effect of forming turbulence, when the heights of the protrusions are the same, the rectangle > trapezoid > triangle > circle > semi-circle, therefore, it is preferable to approximate the rectangular protrusion, which can maximize the turbulent state and efficiently culture the algae liquid.

The pipe can be selected from any size between DN25 and DN500, and can also be processed into

Any size between.

The protrusions of the inner wall of the tube respectively have a certain height and width and an inclination angle according to the shape thereof; the number of protrusions is at least one, and the distribution on the inner wall is uniform or unevenly arranged, or may be The circumferential angle is incrementally or incrementally arranged, while the projections may also extend continuously or intermittently. The uneven arrangement of the protrusions and the discontinuous manner of the protrusions can better disrupt the single turbulent state and form a more complicated fluid state, so that the algae liquid can fully receive the light and grow rapidly.

The length of the tube is ≥ 30 cm, or ≥ 40 cm, preferably ≥ 50 cm; the length of each of the protrusions of the intermittent extension is ≥ 10 mm, and the distance of each break is ≥ 10 mm; preferably each protrusion of the intermittent extension The length is ≥ 50mm, and each disconnected distance is ≥ 50mm.

Preferably, the ends of the tube are circular tubes, and the connecting structure is preferably a ball-grinding, flared or straight-mouth connection.

The protrusion of the inner wall of the tube can serve as a support rib to give the tube a higher strength.

This tube can be used in a photobioreactor.

The material of the tube is transparent material with light transmittance ≥50%, and transparent materials such as glass, PVC, PC, COP, COC, PMMA, PC, PS, K Resin, PET, ABS can be used.

The inner wall has a spirally convex tube that avoids or reduces adherent deposition of algal cells due to the dynamics of fluid flow. Under the same conditions, the algae liquid can be self-stirred during the flow process, and it is in a turbulent state to avoid sedimentation. The structure allows a lower flow rate to pass through the pipe, saving the energy consumption of the system circulation, and the low flow rate can increase the algae liquid in the pipe. The residence time inside increases the time of contact with light and improves the efficiency of growth.

DRAWINGS

Figure 1 shows a single spiral raised tube;

Figure 2 shows a tube with a plurality of helical projections.

detailed description

Example 1:

A single spiral raised tube according to the present application is described in detail below with reference to FIG.

Fig. 1 shows a single spirally projecting tube according to the invention having a projection 2 on the inner wall of the tube 1, the projection 2 extending in a helical manner along the axial direction of the tube 1.

The direction of rotation of the spiral protrusion 2 may be left helix and/or right helix, pitch ≥1 mm, helix angle ≥0°, angular velocity ≥0°, preferably pitch 200,400,600,800 mm, helix angle 15°, 30° 45°, angular velocity is 0°, 30°, etc.

The cross-sectional shape of the tube 1 is preferably circular, and may be rectangular, elliptical, petal, triangular, trapezoidal or other known conventional shapes or simple evolutionary shapes thereof.

The shape of the projections 2 may preferably be approximately trapezoidal, and may also be approximately rectangular, triangular, circular, semi-circular, trapezoidal or other known conventional shapes or simple evolutionary shapes thereof.

The pipe 1 model is preferably DN50, DN70, DN100, DN 200, DN 300 or DN 400, and the pipe 1 can be selected from any size between DN25 and DN500; or the inner diameter of the pipe 1 can be processed to

Preferably, the inner diameter is 50 mm, 60 mm, 70 mm, 100 mm or 200 mm.

The protrusions 2 of the inner wall of the tube 1 respectively have a certain height and width and an inclination angle according to the shape thereof, and the inclination angle is 15°, 30°, 45°, usually between 0 and 90°; the number of the protrusions 2 is One, the height and width of the protrusion 2 can be set freely according to the actual, or can be designed to have a proportional relationship with the inner diameter of the tube of ≤1:2, and the protrusion is continuously extended.

The length of the pipe 1 is 1 m, 1.5 m, 2 m or 3 m, and the length thereof is usually selected to be ≥ 50 mm.

Preferably, the tube 1 is a circular tube at both ends, and may also be rectangular, elliptical, petal or other known conventional shape or a simple evolutionary shape thereof, and the connecting structure is preferably a ball-grinding, flared or straight-mouth connection.

The projection 2 of the inner wall of the tube 1 can serve as a support rib to give the tube a higher strength.

The tube 1 can be used in a photobioreactor, and the photobioreactor can be a straight tube type, a solenoid, a curved tube, a shaped tube or the like, and can also be used for other tube structures.

Example 2:

Fig. 2 shows a pipe 1 having a plurality of spiral projections according to the present invention, in which four projections 2 are uniformly distributed on the inner wall of the pipe 1, and the projections 2 are spirally extended in the axial direction of the pipe 1.

The cross-sectional shape of the tube 1 is preferably circular, and may be rectangular, elliptical, petal or other known conventional shape or a simple evolutionary shape thereof.

Preferably, the inner diameter is 50 mm, 60 mm, 70 mm, 100 mm or 200 mm.

In summary, the inner wall has a spirally convex tube that can be used in any photobioreactor, or other equipment that requires improvement in fluid flow, to avoid or reduce algal cell adherent deposition due to the dynamics of fluid flow, The algae liquid is self-stirred during the flow process, and is in a turbulent state to avoid sedimentation. The structure allows a lower flow rate to pass through the tube, which saves the energy consumption of the system circulation, can increase the residence time of the algae liquid in the tube, and increase the light. The time of contact increases the efficiency of growth.

The principles of the present invention are described above by way of example only, and are not intended to limit the scope of the invention. Rather, the structures described herein can be embodied in many other forms. Numerous alternatives and modifications to the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the appended claims.

Claims

A tube for a microalgae photobioreactor, characterized in that: there is an algae stirring abutment on the inner wall surface of the tube, the protrusion is spirally extended along the axial direction of the tube and has a shape for maintaining the turbulent state of the algae liquid and / or size.
The tube according to claim 1, wherein the spiral projection has a direction of rotation of a left helix or a right helix, a pitch of ≥ 1 mm, a helix angle of ≥ 0°, and an angular velocity of ≥ 0°.
The tube according to claim 1 or 2, wherein the tube has a cross-sectional shape of a circle, a rectangle, an ellipse, a petal, a triangle or a trapezoid.
A tube according to any one of claims 1 to 3, wherein the shape of the projection is approximately rectangular, triangular, circular, semi-circular or trapezoidal.
A pipe according to any one of claims 1 to 4, having a pipe size of DN25 to DN500, or an inner diameter of the pipe
The tube according to any one of claims 1 to 5, wherein the protrusions of the inner wall of the tube have a certain height and width and an inclination angle according to the shape thereof; the number of the protrusions is at least one, and the distribution on the inner wall The mode is uniform or unevenly arranged, and may be arranged in increments or decrements according to a circumferential angle, and the protrusions may also be continuous or intermittently extended.
A tube according to any one of claims 1 to 6, wherein the length of the tube is ≥ 30 cm, and the length of each of the intermittently extending projections is ≥ 50 mm, and each of the breaking distances is ≥ 25 mm.
The tube according to any one of claims 1 to 7, preferably the tube is a circular tube at both ends, and the connecting structure is preferably a ball milled, flared or straight joint.
The tube according to any one of claims 1-8, wherein the protrusion of the inner wall of the tube can be used as a support rib to make the tube have higher strength; the material of the tube body is transparent material, and glass, PVC, and the like are selected. PC, COP, COC, PMMA, PC, PS, K Resin, PET or ABS.
A pipe according to any one of claims 1 to 9, wherein the projection of the inner wall surface of the pipe is formed of the material of the pipe wall itself, or may be made of other materials and then applied to the pipe wall.