CN110257236A - A kind of system of photoconductive tube-raceway pond combination culture oil-producing microalgae - Google Patents
A kind of system of photoconductive tube-raceway pond combination culture oil-producing microalgae Download PDFInfo
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Abstract
The present invention provides a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae systems, belong to technical field of sewage, which includes two large divisions, raceway pond main part, light guide portions.Raceway pond is equipped with monitoring water quality on line analyzer, water pump, water inlet and discharge outlet；Photoconductive tube is installed on top cover of Steel Structure small-sized runway pool device pond, trapping and reallocation by photoconductive tube to natural light, the microalgae of different depth receives identical light intensity irradiation in pond, to promote the growth and breeding of microalgae in raceway pond, for extensive, High Density Cultivation mode the progress of microalgae, the industrialization of microalgae biodiesel is pushed to be worth with important practical.
Description
Technical field
The invention belongs to technical field of sewage, are related to photoconductive tube-raceway pond combination culture oil-producing microalgae system.
Background technique
The energy is the basis of modern social development, concerning national security and economic security.China's richness coal, oil-poor, few gas, from
Since economy starts fast development, energy demand is sharply increased, and in succession in, in 2006 in 2009 in 1993, respectively becomes stone
The net importer of oil, natural gas and coal.Currently, although the economic speedup in China slows down, but still for the rising stage, to fossil fuel
Interdependency be still higher than 50%, energy problem already becomes the bottleneck for restricting China's economic development.
The shortage of the energy promotes various countries to find new cleaning fuel.Since two thousand five, global solar power generation, wind-powered electricity generation point
It is not skyrocketed through with the speed higher than 50% and 25%；And China also starts to vigorously support new energy production to promote competitive strength
The development of industry realizes wind-powered electricity generation installation total amount the first in the world and the grid connected wind power installation total amount world, in June, 2012 in 2010 respectively
First, and grid connected wind power installation total amount alreadys exceed 5,000,000 kilowatts.However the development of solar energy, nuclear power, wind energy by region and
Meteorological condition limitation, it is universal to be unable to get large area.Therefore, the research being just born to bioenergy.
Early in the 1950s, microalgae initially enters as fuel feedstocks the visual field of people.Carry out from the U.S. in 1978
" water biological species plan " screens oil-rich microalgae so far, and scholars have carried out depth to each link of microalgae biodiesel preparation process
Enter research.Currently, common algae is chlorella, Isochrysis galbana, diatom and Phaeodactylum tricornutum etc. in research both at home and abroad, these
The fat content of algae all reaches 20% or more.
The problems such as light utilization efficiency generally existing for oil-producing microalgae culture is low at present, large-scale production takes up a large area, sternly
The development of the industry is limited again.
CN02206967.4 provides a kind of membrane type airbag inner light source solar energy light-organic, in culture liquid case (4)
Inside there is multiple rows of photoconductive tube group (2) being made of membrane type airbag, the upper end of photoconductive tube is interconnected, and light receiving plate (6) are arranged at top, in light
There are the hollow clapboard (3) being connected to external water source in the side and bottom of conduit group.Form of light source improves within this reactor
The light-receiving area of unit volume micro algae culturing liquid, hence it is evident that improve microalgae yield, and the microalgae product of heterogeneity can be cultivated.The hair
Membrane type airbag needed for bright is excessive for culture pond inner volume occupancy, although improving the microalgae yield of unit volume, microalgae is raw
Long region is reduced, and limits the total concentration of microalgae to a certain extent.
CN201320757371.5 provides a kind of raceway pond bioreactor, including raceway pond (1), speed change stirring system
System, carbon dioxide make-up system (4), ground temperature-controlling system.The shortcomings that system, is that not can solve bottom microalgae is illuminated by the light deficiency
Problem, and merely by accelerating to recycle, this increases economic cost for promoting micro algae growth effect less.
For these problems, the present invention proposes photoconductive tube-raceway pond combination culture oil-producing microalgae system, by nature
The trapping and reallocation of light to improve light utilization efficiency, and provide reference to the industrialization process of microdisk electrode.
Summary of the invention
The main object of the present invention is to provide a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae system, is used to gram
Take the problems such as generally existing light utilization efficiency during sewage culture oil-producing microalgae is low, scale takes up a large area.
The invention is realized in this way a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae system, specifically includes that
(1) light source introduce, by photoconductive tube will natural light import the water surface below be unable to direct projection position, thus make lower part by
Light solves the problems, such as that natural light can not be transmitted to underwater when water level is too deep；
(2) micro algae growth is assisted, receives raceway pond compared with intense light irradiation, to promote microalgae compared with microalgae under deep water by (1)
Growth.
Further, the photoconductive tube-raceway pond combination culture oil-producing microalgae system, main structure are divided into two parts,
Raceway pond portion size is width 2m, overall length 2.5m, high 1.2m share 4 gallerys；Light guide portions, photoconductive tube are installed on pond top cover
On son.
Further, the photoconductive tube-raceway pond combination culture oil-producing microalgae system, runway pool structure use steel structure
Frame.
Further, the system of the photoconductive tube-raceway pond combination culture oil-producing microalgae, auxiliary equipment include pH, temperature,
Dissolved oxygen, turbidity on-line detection instrument are equipped with water-circulating pump.
Further, the photoconductive tube-raceway pond combination culture oil-producing microalgae system, intake-outlet are respectively arranged at race
It is specific as shown in Figure 1 in two long side of road pond outermost.
Further, raceway pond shape are as follows: the small semicircle parallel side-by-side of the 0.5m of raceway pond side two connects, and other side is
The large semi-circular of 1m, two structures that are square between small semicircle and large semi-circular, 4 gallerys are respectively by the connecting line of two small semicircles
To more than half circle center extend Steel Structure and be set to inside raceway pond be parallel to rectangular and large semicircle Steel Structure separate and
At the width of every gallery is about 0.5m；Photoconductive tube is uniformly arranged on internal Steel Structure.Specifically as illustrated in figures 1 and 8.
Further, photoconductive tube is preferably 6, is uniformly arranged on internal Steel Structure, specific as shown in Figure 5.
Further, illumination illumination of the algae solution at the 500mm of bottom should be in 2000lx or more, and illumination illumination is answered on liquid level
As far as possible close to 2 7777.8lx.
Further, the distance between photoconductive tube diffusing globe and liquid level are 50mm.
Further, the spacing between adjacent light guides pipe central axes is set to 600-1000mm.
Further, in addition uniformly 8 fluorescent lamps are arranged in addition between photoconductive tube in raceway pond.
Further, the present invention provides a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae methods, using aforementioned system
System, specific steps are as follows:
(1) sewage is passed through in raceway pond in advance, the basic nutrients of micro algae growth is provided；
(2) suitable microalgae is added, carries out the culture of microalgae；
(3) depth of shine that light is improved by photoconductive tube, to promote the growth of microalgae in raceway pond.
The present invention has the advantage that compared with the existing technology
(1) light utilization efficiency is high, reactor head natural light can be introduced reactor bottom, to improve the utilization rate of light
(illumination photometer measurement).
(2) micro algae growth situation is good, by the redistribution of light, so that underwater illumination patterns are more to solve instead
The disadvantage for answering device bottom light weaker, to promote the growth and breeding (measuring with chlorophyll a) of microalgae.
Detailed description of the invention
Fig. 1 is photoconductive tube of the present invention-raceway pond combination culture oil-producing microalgae system structure diagram；
Fig. 2, the situation of change schematic diagram of algae solution turbidity in cultivation cycle；
Plane average light intensity is given within the scope of Fig. 3, distance 5-900mm；
Fig. 4, illumination analysis result in light receiving surface when spacing is 50mm；
Fig. 5, photoconductive tube integral arrangement scheme；
Fig. 6, the growth curve of chlorella in raceway pond；
Fig. 7, chlorella items growth indexes in raceway pond；
Fig. 8, fluorescent lamp add schematic diagram；
Fig. 9, algae solution liquid level analyzes result when of no help smooth；
Figure 10, algae solution liquid level illumination analysis result after light filling；
Figure 11, refractometry schematic diagram.
Specific embodiment
The present invention provides a kind of system of photoconductive tube-raceway pond combination culture oil-producing microalgae, below in conjunction with attached drawing and implementation
The present invention is described in detail for example, but the present invention is not limited to this.
As shown in Figure 1, apparatus main body structure is divided into two parts, raceway pond portion size is width 2m, overall length 2.5m, height
1.2m shares 4 gallerys；Light guide portions, photoconductive tube are installed on top cover of pond.
Below to carry out the specific embodiment of sewage culture to chlorella using the present invention, further Jie is done to the present invention
It continues:
Embodiment 1:
The research of the invention finds that there is the sunlight of photosynthesis light saturation point when chlorella grows under field conditions (factors)
Effect radiation is 500 μm of olm-2·s-1, corresponding illumination illumination is 27777.8lx.
It is found according to optical attenuation curve experiments, the incident light of 2 000lx can meet the life for the chlorella that depth is 500mm
Long demand.
Therefore, illumination illumination of the algae solution at the 500mm of bottom should be in 2000lx or more, and illumination illumination should be use up on liquid level
It measures close to 2 7777.8lx.
Embodiment 2:
In a practical situation, by being incident in algae solution in air refraction effect can occur for light, lead to photoconductive tube emergent light
Range of exposures enter when algae solution change, need to be measured algae solution refractive index thus, and according to this to range of exposures
It is modified.The refractive index (n) of chlorella algae solution and sanitary sewage is measured respectively, experimental data and the results are shown in Table 2-1.
1 sanitary sewage of table and chlorella algae solution refractive index measurements (shown in Figure 11)
For identical angle of incidence of light, refractive index is bigger, illustrates the angle of emergence (angle between emergent ray and normal
Degree) it is smaller, then the irradiated area of photoconductive tube in water is smaller.To enable designed scheme to guarantee chlorella in mal-condition
In normal growth, the situation of illumination irradiated area minimum is considered as when designing photoconductive tube illumination scheme.Therefore liquid refracting
Rate is using chlorella algae solution refractive index n=1.50 as design value.
Embodiment 3:
It is turbid to algae solution in cultivation cycle to make the illumination scheme of design can satisfy the lighting requirements in entire cultivation cycle
The variation of degree is studied, and the variation of algae solution turbidity in a cultivation cycle is organized into figure, as shown in Figure 2.
As shown in Figure 2, it is 190NTU or so that Initial stage of culture, which is chlorella algae solution turbidity, therefore, when designing illumination scheme, with
Algae solution turbidity 190NTU is reference value.
Embodiment 4:
It is found by previous experiments, when diffusing globe is away from water surface certain distance, the region of light dispersion connects greater than diffusing globe
Touch the situation in algae solution.By adjusting the distance between photoconductive tube diffusing globe and liquid level, the intensity of illumination of incidence algae solution can be changed
With range of exposures of the importing light on the water surface.When diffusing globe is away from algae solution liquid level 50mm, then 50-900mm model below diffusing globe
The variation for enclosing interior average intensity is as shown in Figure 3.According to experimental result, the average light intensity in the plane apart from diffusing globe 50mm
For 2 134.1lx, the growth demand of chlorella can be met.
Therefore the factors such as factors and chlorella light utilization efficiency such as equipment installation and equipment warranty are comprehensively considered, by photoconductive tube
The distance between diffusing globe and liquid level are that 50mm is more suitable for.
Embodiment 5:
Adjusting the spacing between photoconductive tube diffusing globe and liquid level is 50mm, and light receiving surface is set to below liquid level at 49mm,
Radius is 500mm.Illumination analysis result such as Fig. 4 after ray tracing.It is maximum by optical range in chlorella algae solution to make, it protects simultaneously
The basic striation part for meeting chlorella growth in card algae solution, is set to 600-1000mm for the spacing of adjacent light guides pipe central axes.
Embodiment 6:
Photoconductive tube arrangement is carried out according to the design parameter of above-mentioned determination, as shown in Figure 5.Growth of the microalgae in raceway pond is bent
Line is shown in Fig. 6, and biomass is with Chlorophyll-a Content secondary indication.The trend of the chlorella growth curve indicated in figure in outdoor
Situation in sufficient illumination cultivation is similar, illustrate photoconductive tube provide lighting environment with outdoors under the conditions of lighting environment phase
Seemingly, for chlorella normal growth.
At culture period the 5th day, the dry weight and fat content of chlorella are measured.Every growth indexes are shown in Fig. 2, cultivation cycle
The situation of change schematic diagram of interior algae solution turbidity；
Plane average light intensity is given within the scope of Fig. 3, distance 5-900mm；
Fig. 4, illumination analysis result in light receiving surface when spacing is 50mm；
Fig. 5, photoconductive tube integral arrangement scheme；
Fig. 6, the growth curve of chlorella in raceway pond；
Figure, wherein dry weight reaches 0.31g/L, and fat content reaches the 49.3% of dry weight, illustrates chlorella in raceway pond
Upgrowth situation is good.
From this, designed in this research raceway pond illumination scheme when it is reasonable, can satisfy racetrack microdisk electrode
The growth demand of chlorella in system.
Embodiment 7:
According to the light compensation point of chlorella growth, outdoor natural light illumination is insufficient when Shenzhen's rainy weather or rainstorm weather
1 000lx is unable to satisfy the growth of microalgae.For the growth demand for meeting chlorella, the average light on algae solution liquid level according to illumination extremely
It is less 2 000lx.For the normal growth for guaranteeing microalgae, it is necessary to separately light filling.8 daylight are in addition added in runway pool model
Lamp (as shown in Figure 8), it is assumed that it is 800lx that the average light imported in model when rainy days through photoconductive tube, which is shone, then not light filling and light filling
Illumination analysis result afterwards on algae solution liquid level is not as shown in Figure 9 and Figure 10.
Above example explanation, the present invention is by the trapping and reallocation to natural light, so that the undesirable reaction of script illumination
The abundant light in device bottom, meets the condition of micro algae growth, so that the growth and breeding of microalgae is promoted, for the big of oil-producing microalgae
Scale, High Density Cultivation provide reference, into the process of microalgae bioenergy.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae system, it is characterised in that:
(1) light source introduces, and natural light is imported the water surface or less by the system and is unable to direct projection position, to make lower part light, solves
Natural light can not be transmitted to underwater problem when certainly water level is too deep；
(2) micro algae growth receives raceway pond compared with intense light irradiation, to promote micro algae growth compared with microalgae under deep water by (1).
2. photoconductive tube according to claim 1-raceway pond combination culture oil-producing microalgae system, it is characterised in that: this is
The main structure of system is divided into two parts, and raceway pond portion size is width 2m, overall length 2.5m, high 1.2m share 4 gallerys；Photoconductive tube
Part, photoconductive tube are installed on top cover of pond.
3. photoconductive tube according to claim 1-raceway pond combination culture oil-producing microalgae system, it is characterised in that: runway
Pool structure uses Steel Structure.
4. photoconductive tube according to claim 1-raceway pond combination culture oil-producing microalgae system, it is characterised in that: attached
Device includes pH, temperature, dissolved oxygen, turbidity on-line detection instrument, is equipped with water-circulating pump.
5. photoconductive tube according to claim 1-raceway pond combination culture oil-producing microalgae system, it is characterised in that: disengaging
The mouth of a river is respectively arranged in two long side of raceway pond outermost.
6. photoconductive tube according to claim 1-raceway pond combination culture oil-producing microalgae system, it is characterised in that: runway
Pond shape are as follows: the small semicircle parallel side-by-side of the 0.5m of raceway pond side two connects, and other side is the large semi-circular of 1m, two small
Be square structure between semicircle and large semi-circular, what 4 gallerys extended from the connecting line of two small semicircles to more than half circle center respectively
Steel Structure and the rectangular and large semicircle Steel Structure that is parallel to being set to inside raceway pond separate, the width of every gallery
About 0.5m；Photoconductive tube is uniformly arranged on internal Steel Structure.
7. photoconductive tube according to claim 6-raceway pond combination culture oil-producing microalgae system, it is characterised in that: light guide
Pipe is 6, is uniformly arranged on internal Steel Structure.
8. photoconductive tube according to claim 6 or 7-raceway pond combination culture oil-producing microalgae system, it is characterised in that: algae
Illumination illumination of the liquid at the 500mm of bottom should be in 2000lx or more, and illumination illumination should be as far as possible close to 2 on liquid level
7777.8lx；The distance between photoconductive tube diffusing globe and liquid level are 50mm；Spacing between adjacent light guides pipe central axes is set to
600-1000mm。
9. photoconductive tube according to claim 6 or 7-raceway pond is combined the system for cultivating oil-producing microalgae, light guide in raceway pond
In addition uniformly 8 fluorescent lamps are arranged in addition between pipe.
10. the method for a kind of photoconductive tube-raceway pond combination culture oil-producing microalgae algae, using any one of preceding claims 1-9
The system, specific steps are as follows:
(1) sewage is passed through in raceway pond in advance, the basic nutrients of micro algae growth is provided；
(2) suitable microalgae is added, carries out the culture of microalgae；
(3) depth of shine that light is improved by photoconductive tube, to promote the growth of microalgae in raceway pond.
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