CN101632898A - Method and equipment for adsorbing CO2 in flue by utilizing microalgae and on-line detection method - Google Patents
Method and equipment for adsorbing CO2 in flue by utilizing microalgae and on-line detection method Download PDFInfo
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- CN101632898A CN101632898A CN200910091012A CN200910091012A CN101632898A CN 101632898 A CN101632898 A CN 101632898A CN 200910091012 A CN200910091012 A CN 200910091012A CN 200910091012 A CN200910091012 A CN 200910091012A CN 101632898 A CN101632898 A CN 101632898A
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Abstract
The invention discloses a method and equipment for adsorbing CO2 in a flue by utilizing microalgae and an on-line detection method. Microalgae seeds in a logarithmic phase and a nutrient solution are inoculated into a pipeline optical collector and cultured in a weight proportion of 1:5-15; flue gas is filled into the pipeline optical collector after being desulfurized and dedusted; under the push of a centrifugal pump, microalgae liquid flows in the pipeline; and then the microalgae liquid is cycled to return to the pipeline optical collector through a material mixing and gas exchanging device. The flue gas is treated by the method, thereby effectively overcoming the defects of larger water evaporation amount, easy overflow of CO2, low optical utilization rate and high demand of land resources. The method not only enables the microalgae liquid and the nutrient solution to be uniformly distributed, but also can solve the problem that the microalgae in the reactor sinks to attach a wall. A gas analysis device in the material mixing and gas exchanging tank can prevent bubbles from increasing in the pipeline to form a gas column, thereby avoiding obstructed microalgae liquid flowing. After a system is treated by the method, the efficiency of adsorbing and fixing the CO2 of the system can reach 35 percent.
Description
Technical field
The present invention relates to a kind of method and apparatus and online test method of utilizing algae to absorb carbon dioxide in the flue gas, more particularly, relate to a kind of method and apparatus and online test method of utilizing little algae to absorb carbon dioxide in the flue gas.
Background technology
In in the past 400,000 years, CO in the atmosphere
2Concentration fluctuates between 180～280ppm all the time.To late period in 19th century, after the mankind begin to use fossil fuel on a large scale, CO in the atmosphere
2Concentration rises to present 430ppm.Along with the increase of industrial expansion and population, human society is discharged into the CO in the atmosphere
2Constantly increase CO in the year two thousand fifty atmosphere
2Concentration will be up to 850ppm.Along with CO
2Content is more and more higher, and it is more and more hotter that the earth will become, and existent environment of people will be seriously damaged.Face the climate change challenge in the whole world jointly, advance under the situation of the sustainable development of socio-economy, the energy and relevant therewith environmental problem become particularly important.
CO
2Catch and seal up for safekeeping definite reduction CO as the inter-governmental climate change committee of the United Nations (IPCC)
2One of method of discharging is paid close attention in recent years in the world especially, is placed in status energy-conservation, that the regenerative resource development and use are of equal importance.CO
2Emission-reduction technology is not only the technological means that solves the energy and environment problem, the infant industry development that the innovation of its technology also will drive " low-carbon economy " and extend thus.According to the property sort of existing technology, CO
2The technological means of catching and seal up for safekeeping be broadly divided into physics CO
2Fixation, chemical CO
2Fixation and biological CO
2The fixation three major types.Physics CO
2The fixation technology except the stability problem of burying and collection, purifying, concentrated cost are higher, also potential the risk of aspects such as underground water, stratum, marine biosphere and weather.Chemistry CO
2Fixation often needs pure CO
2, and the CO of discharging
2Purity generally has only 10～20%, and this just needs expensive separation costs.Very thin Euglena is that growth and breeding is fastest in the world, utilizes the most effective plant of photosynthesis absorbing carbon dioxide, and in addition, it also has, and environmental suitability is strong, treatment effeciency is high, adjustable and easily and advantage such as the Other Engineering technology is integrated.And can obtain efficient, three-dimensional, highdensity culture technique, produce a large amount of fronds behind the carbon admittedly simultaneously and have good value, therefore, biological CO
2Technique for fixing, especially very thin Euglena CO
2Fixation is a main and the most effective solid carbon mode (as shown in Figure 1) on the current earth, have more environmental protection, economy, thoroughly, meet the unique advantage of nature circulation, provide a completely newly effective carbon pattern admittedly for the mankind solve the greenhouse gas emission problem.
In order to realize efficiently utilizing the CO in little algae absorption power plant or the cement plant flue gas
2, and obtain precisely and CO intuitively
2The online monitoring data of fixed rate just need provide a reliable and controlled breed and monitoring system.Yet the system's great majority that carry out little algae large-scale farming at present utilize the cultivating system of open pond as little algae to open the runway pond, and the following several problems of main existence: 1. water evaporation quantity is big; 2.CO
2Overflow easily; 3. it is bigger to be affected by the external environment, and disturbs as microorganism etc.; 4. light utilization efficiency is lower, causes the cultivation density of little algae lower; 5. the land resource demand is higher.More than the 1st, 2 and 3 problem directly influenced the fixed effect of little algae absorbing carbon dioxide and effective enforcement of Clean Development Mechanism (CDM) monitoring method thereof.
In recent years, the closed reactor more and more is subjected to paying attention to widely.The closed reactor can be understood as the cultivating system that a kind of sealing is provided to the growth of little algae, and in this system, most light directly do not contact (in open cultivating system, light can directly contact with the breed liquid level) with the breed liquid level; But light can pass transparent reactor tube walls and contact with little algae of culturing then.So airtight reactor does not allow or has limited greatly the direct exchange (carbon dioxide, oxygen) of gas, the erosion (dust, microorganism etc.) of pollutant in algae liquid and air.Compare open cultivating system, airtight cultivating system has the possibility of higher yield, because it can provide better environment control.Compare open cultivating system, the closed reactor has following advantage: (1) prevents or reduces pollution; (2) provide control good in the breeding process; (3) prevent the evaporation of moisture; (4) loss of minimizing carbon dioxide; (5) can obtain higher cell concentration and area output.
Summary of the invention
One of purpose of the present invention provides a kind of method and apparatus and online test method of utilizing little algae to absorb carbon dioxide in the flue gas.
Two of purpose of the present invention is in order to overcome the shortcoming of existing open cultivating system, and a kind of closed conduit algae cultivating system that declines is provided, and is used for power plant, cement plant or the flue gas CO of other factory
2Remove.
Three of purpose of the present invention is provided with gas flow and analytical equipment by air inlet and outlet side in the both culturing microalgae system, monitors this system in real time and utilizes little algae to remove CO in the flue gas
2Effect, and the carbon dioxide fixation rate of this system carried out CDM monitoring and counting statistics.
These and other objects of the present invention will and be described by following detailed description and further embody and illustrate.
The present invention utilizes little algae to absorb CO in the flue gas
2Method, in closed pipeline bioreactor, carry out CO in the flue gas
2Directly contact with nutrient solution with little algae algae kind, described closed conduit optical collector is made by the good material of light transmission, its caliber is 10-30 centimetre, can be " U " type, ring-type or other shape that is suitable for circulating, and can be according to the actual treatment amount in parallel or the pipeline optical collector more than one group of connecting.
Further, the present invention utilizes little algae to absorb the method for carbon dioxide in the flue gas, be that little algae algae kind that will be in exponential phase is inoculated in the pipeline optical collector (1), nutrient solution is sent into this system by batch mixing and gas swap tank (2), the weight ratio of little algae algae kind and nutrient solution is 1: 5-1: 15, under the power-assisted of centrifugal pump (3) promotes, algae liquid flows in pipeline, to inject closed conduit optical collector (1) via air inlet (13) with the speed of 500～1000 ml/min through the flue gas of desulfurization, dedusting, make the CO in the flue gas
2Directly contact, for the little algae in the pipeline optical collector provides carbon source with algae liquid; Again via batch mixing and gas swap tank (2) extra-nutrition liquid, get rid of flue gas after treatment, be circulated back at last in the pipeline optical collector (1).Little algae described in the present invention can be very thin Euglena, Phaeodactylum tricornutum, chlorella, Chlorococcum, scenedesmus obliquus, haematococcus pluvialis, salt algae or the like; Described nutrient solution is an inorganic nutrient solution, comprise inorganic nitrogen, Phos, macroelement, trace element, vitamin and water, wherein inorganic nitrogen can be one or both of ammonium chloride or urea, Phos is a potassium dihydrogen phosphate, a great number of elements is one or more a mixture of calcium, magnesium, iron, sodium salt, trace element is one or more a mixture of manganese, cobalt, zinc, mantoquita, and vitamin is B
1, B
12One or more.
Further, the present invention utilizes little algae to absorb the method for carbon dioxide in the flue gas, normally has by day under the sunshine condition, and algae liquid circulates repeatedly, turns off centrifugal pump after the darkness, stops algae liquid and circulates intrasystem.If any special needs, under cloudy weather or when needing work night, can be by secondary light source be installed around the pipeline optical collector, give illumination compensation, for intrasystem little algae under the situation of natural lighting deficiency, more luminous energy is provided, still can carries out photosynthesis to ensure the little algae in the pipeline optical collector.
The of the present invention utilization in the method that little algae absorbs carbon dioxide in the flue gas, the cultivating condition of little algae in bioreactor is:
Dissolved oxygen amount 0-20mg/L pH value 3.5-10
Temperature 15-33 ℃ of electricity led 0-199.9mS
About flow velocity 10-25 cel system pressure 1 atmospheric pressure.
Cultivating condition is preferably:
Dissolved oxygen amount 10-15mg/L pH value 3.5-5
Temperature 22-27 ℃ of electricity led 30-80mS
About flow velocity 12-16 cel system pressure 1 atmospheric pressure.
Little algae is a large amount of CO that absorb in system
2, utilize solar energy to carry out light and effect, discharge oxygen simultaneously, in order to prevent excess of oxygen in intrasystem accumulation, under the effect of centrifugal pump 3, algae liquid is pushed to batch mixing and gas swap tank 2.When the dissolved oxygen content that is monitored when dissolved oxygen detector 12 is higher than value range, start vavuum pump 7, detach gas in the system, reduce dissolved oxygen level, concentrated nutrient solution is added to batch mixing and the gas swap tank 2 from port 8, in the internal system cyclic process, for little algae provides necessary nutrient source.
The present invention utilizes little algae to absorb the equipment of carbon dioxide in the flue gas, comprise pipeline optical collector 1, gas swap tank 2, centrifugal pump 3, shutoff valve 4, aerate head 5, switch valve 6, vavuum pump 7, air inlet 13, wherein, centrifugal pump 3 is connected in series with shutoff valve 4, pipeline optical collector 1, between shutoff valve 4 and pipeline optical collector 1, insert air inlet 13, the other end of centrifugal pump 3 is connected with gas swap tank 2, and the upper end of gas swap tank 2 is connected with the other end of valve 4 and pipeline optical collector 1.At the switch valve 6 of the bottom of pipeline optical collector 1 connection as the mouth of gathering, be connected with nutrition on the gas swap tank 2 and add mouth 8, standby mouthful 9 of gas detection, gas liberation port 10, sample tap 11, dissolved oxygen detector 12, air inlet 13 is connected with entrance point gas analyzer 17 and gas flowmeter 16; Be connected with port of export gas concentration detector 14 and gas flowmeter 15 on the gas liberation port 10.
The little algae of the online detection of the present invention absorbs the method for carbon dioxide in the flue gas, is flue gas sources 18 is connected with gas analyzer 17 after through conventional desulfurization, dust removal process, can online detection flue gas in CO
2Concentration then by gas flowmeter 16, is carried out the integrating of instantaneous and integrated flux, and flue gas is through gas flowmeter 16, enters the pipeline optical collector 1 of both culturing microalgae system, the CO of system's air inlet end from port one 3
2Feed total amount and flow into metering and CO by flue gas
2Concentration calculates.Be connected gas analyzer 14 at batch mixing with gas release port 10 places at gas swap tank 2 tops, the carbon dioxide that this system of on-line monitoring discharges and the composition of oxygen, gas detecting instrument 14 and gas flowmeter 15 polyphones, this system of on-line monitoring discharges the flow of gas; Gas flowmeter 14 links to each other with computer respectively with 16 with gas analyzer 17, gas analyzer 15, after real-time online record flue gas feeds this both culturing microalgae system, and CO
2Real time data that is absorbed and fixes and integrating statistics thereof.
The present invention is connected with many group transparent pipeline optical collectors with gas exchange device by setting up a closed batch mixing, be little algae efficient absorption carbon dioxide, the absorption efficiency and the accumulated quantity that accumulate biomass fast and accurately calculate carbon dioxide provide the high efficiency technical approach.Because the pipeline bioreactor that the inventive method adopts is based upon outdoor, being convenient to composition absorbs solar energy, promote the growth of little algae photosynthesis, thus be specially adapted to handle the big flue gas of discharge capacity, and overcome effectively that the prior art water evaporation quantity is big, CO
2The defective that overflow easily, light utilization efficiency is low, the land resource demand is higher.With the inventive method algae liquid and nutrient solution are evenly distributed, also can avoid the adherent problem of frond sinking in the reactor, help the gas exchange.In batch mixing and gas swap tank, be provided with the gas resolver, the gas resolver is a tube aerator, when charging into an amount of gas, can strengthen the contact area of carbon dioxide and algae liquid, not only increased the gas-liquid exchange, prevented that simultaneously bubble from increasing the formation gas column in transparent pipeline, the inhibition of having avoided gas column that algae liquid is flowed and produces.For utilizing little algae to realize the industrial production activity of the Clean Development Mechanism (CDM) that industrial carbon dioxide reduces discharging, technological approaches efficiently is provided, become the key core technology that industrial carbon dioxide reduced discharging and developed little algae resource.With the flue gas that the inventive method is handled, detect the system that draws and absorb and fixation of C O
2Efficient can reach 35%, the oxygen rich gas of discharge and frond also can carry out industry and utilize.
Description of drawings
Fig. 1 is little algae photosynthesis fixation of C O in the prior art
2The mode schematic diagram.
Fig. 2 is the structural representation of duct type both culturing microalgae of the present invention system.
Fig. 3 is CO of the present invention
2The monitoring system schematic diagram that absorption and gas discharge.
In Fig. 2 and Fig. 3: 1, pipeline optical collector; 2, batch mixing and gas swap tank; 3, centrifugal pump; 4, shutoff valve; 5, aerate head; 6, switch valve; 7, vavuum pump; 8, be used for nutrient solution and add mouth; 9, gas detects standby mouthful; 10, gas liberation port; 11, sample tap; 12, dissolved oxygen detector; 13, CO
2Blow vent; 14, system outlet end gas concentration detector; 15, system outlet end gas flowmeter; 16, system's entrance point gas flowmeter; 17, system's entrance point gas analyzer; The flue gas sources of 18, process desulfurization, dedusting; 19, gas liberation port.
Below in conjunction with embodiment the present invention is carried out concrete description.As known by the technical knowledge, the present invention can realize by other the embodiment that does not break away from its spiritual essence or essential feature.Therefore, following embodiment with regard to each side, all just illustrates, and is not only.All within the scope of the present invention or the change that is equal in the scope of the present invention all be included in the invention.
The specific embodiment
Embodiment 1:
Utilize little algae to handle the method for power plant or cement plant flue gas:
As shown in Figure 2, little algae algae kind (being preferably very thin Euglena) that will be in exponential phase and nutrient solution are inoculated in the pipeline optical collector 1 by 1: 10 weight ratio and culture.The flue gas process desulfurization in power plant or cement plant, dedusting are afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 500～1000 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source.Under the power-assisted of centrifugal pump 3 promoted, algae liquid flowed in pipeline, via batch mixing and gas swap tank 2, is circulated back to pipeline optical collector 1.Under the sunshine condition, algae liquid circulates repeatedly by day; Turn off the work of centrifugal pump 3 night after the darkness, stop algae liquid and circulate intrasystem.To the maintenance of pipeline optical collector 1 and batch mixing and gas swap tank 2, in connecting pipe, be provided with shutoff valve 4 for convenience, can hold back intrasystem liquid.Switch valve 6 among the figure carries out the control of gathering of algae liquid as the mouth of gathering, and also from then on mouth carries out the emptying operation to this pipe-line system.
The control of both culturing microalgae condition:
This system is communicated with atmosphere, and therefore, its operating pressure is about 1 atmospheric pressure.In the both culturing microalgae process, according to different little algae provenances, in the condition and range value inner control internal system service condition of table 1 qualification.
Table 1
Little algae is a large amount of CO that absorb in system
2, and utilize solar energy to carry out light and effect, and discharge oxygen simultaneously, in order to prevent excess of oxygen in intrasystem accumulation (excessive dissolved oxygen is unfavorable for the growth of little algae), therefore, under the effect of centrifugal pump 3, algae liquid is pushed to batch mixing and gas swap tank 2.When the dissolved oxygen content that is monitored when dissolved oxygen detector 12 is higher than value range, start vavuum pump 7, detach gas system in, the reduction dissolved oxygen level.Concentrated nutrient solution adds mouth 8 from nutrient solution and is added to batch mixing and the gas swap tank 2, in the internal system cyclic process, for little algae provides necessary nutrient source.
We are with from sample tap 11 sampling, as the usefulness of the sample of various off-line datas monitorings.This system is to CO
2The assay determination of the absorption of gas and the gas that discharges thereof will be by being connected on CO respectively
2The gas flowmeter and the gas analyzer of gas inlet 13 and this system gas liberation port 10 are realized, carry out the integrating and the record (seeing Fig. 3 for details) of gas gross by computer.
Power plant or cement plant flue gas can realize by the course of work shown in Figure 2 through absorbed metering behind the native system and efficiency analysis.Flue gas sources 18 is connected with gas analyzer 17 after through conventional desulfurization, dust removal process, can online detection flue gas in CO
2Concentration then by gas flowmeter 16, is carried out the integrating of instantaneous and integrated flux, and flue gas is through gas flowmeter 16, enters the pipeline optical collector 1 of both culturing microalgae system from port one 3, for micro algae growth provides necessary carbon source.The CO of this system's air inlet end like this
2Feed total amount and can flow into metering and CO by flue gas
2Concentration calculates.
Be connected gas analyzer 14, the carbon dioxide that this system of on-line monitoring discharges and the composition of oxygen at batch mixing with gas liberation port 10 places at gas swap tank 2 tops.Gas detecting instrument 14 and gas flowmeter 15 polyphones, but this system of on-line monitoring discharges the flow of gas.Gas flowmeter 14 and 17, gas analyzer 15 links to each other with computer with 16, realizes real-time online record and calculating, after acquisition flue gas feeds this both culturing microalgae system, CO
2The real time data that is absorbed and fixes.
Because little algae absorbs CO
2Carry out photosynthetic speed and be subjected to algae kind character, nutritional condition and weather condition effect bigger, therefore, this system absorbs and fixation of C O
2Efficient between 10～35%.
Utilize very thin Euglena to handle the method for power plant or cement plant flue gas:
The nutrient solution of very thin Euglena is pressed following prescription:
NH
4Cl 1600mg/L CO(NH
2)
2 60mg/L
KH
2PO
4 1500mg/L MgSO
4 400mg/L
CaCl
2 40mg/L Fe
2(SO
4)
3 10mg/L
Na
2EDTA 5mg/L MnCl
2 1.8mg/L
CoSO
4 1.5mg/L ZnSO
4 0.4mg/L
Na
2MoO
4 0.2mg/L CuSO
4 0.02mg/L
Cobastab
1The 3mg/L Cobastab
1225 μ g/L.
Very thin Euglena algae kind and the above-mentioned nutrient solution weight ratio with 1: 8 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 2 * 10
5Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 800 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 4-5, temperature is controlled at 24-26 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Utilize chlorella to handle the method for power plant or cement plant flue gas:
The nutrient solution prescription that chlorella is cultured:
KNO
3 1250mg/L KH
2PO
4 1250mg/L
MgSO
4·7H
2O 1000mg/L CaCl
2·2H
2O 111mg/L
Na
2EDTA 5mg/L FeSO
4·7H
2O 0.5mg/L
H
3BO
3 0.11mg/L ZnSO
4·7H
2O 0.09mg/L
MnCl
2·4H
2O?0.014mg/L MoO
3 0.007mg/L
CuSO
4·5H2O?0.016mg/L Co(NO
3)
2·6H
2O 0.005mg/L。
Chlorella algae kind and the above-mentioned nutrient solution weight ratio with 1: 10 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 5 * 10
5Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 600 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 8-9, temperature is controlled at 26-30 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Utilize scenedesmus obliquus to handle the method for power plant or cement plant flue gas:
The nutrient solution prescription that scenedesmus obliquus is cultured:
KNO
3 1250mg/L KH
2PO
4 1250mg/L
MgSO
4·7H
2O 1000mg/L CaCl
2·2H
2O 111mg/L
Na
2EDTA 5.00mg/L FeSO
4·7H
2O 0.50mg/L
H
3BO
3 0.11mg/L ZnSO
4·7H
2O 0.088mg/L
MnCl
2·4H
2O?0.014mg/L MoO
3 0.007mg/L
CuSO
4·5H
2O?0.016mg/L Co(NO
3)
2·6H
2O?0.005mg/L
Scenedesmus obliquus algae kind and the above-mentioned nutrient solution weight ratio with 1: 10 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 2 * 10
5Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 1000 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 8-9, temperature is controlled at 25-33 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Utilize Dunaliella salina to handle the method for power plant or cement plant flue gas:
The nutrient solution prescription that Dunaliella salina is cultured:
NaCl 29200mg/L KCl 200mg/L
KNO
3 1000mg/L MgCl
2·6H
2O 1500mg/L
MgSO
4·7H
2O 500mg/L K
2HPO
4 45mg/L
Tris-HCl 2450mg/L CaCl
2·2H
2O 200mg/L
Na
2EDTA 1.89mg/L EDTA-Fe 3.64mg/L
ZnSO
4·7H
2O 0.087.00mg/L H
3BO
3 0.61mg/L
CoCl
2·6H
2O 0.015mg/L CuSO
4·5H
2O 0.06mg/L
MnCl
2 0.23mg/L (NH
4)
6Mo
7O
24·4H
2O 0.38mg/L。
Dunaliella salina algae kind and the above-mentioned nutrient solution weight ratio with 1: 10 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 2 * 10
5Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 1000 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 8-9, temperature is controlled at 25-30 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Utilize little plan ball algae to handle the method for power plant or cement plant flue gas:
The nutrient solution of little plan ball algae is pressed following prescription:
NaCl 35g/L NaNO
3 170mg/L
NaH
2PO
4 12mg/L FeCl
3 4.53mg/L
Na
2EDTA·2H
2O?2.83mg/L CuSO
4 0.01mg/L
ZnSO
4 0.03mg/L CoCl
2 0.02mg/L
MnCl
2 0.23mg/L
Little plan ball algae algae kind and the above-mentioned nutrient solution weight ratio with 1: 10 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 1 * 10
5Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 1000 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 7-9, temperature is controlled at 22-30 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Utilize Phaeodactylum tricornutum to handle the method for power plant or cement plant flue gas:
The nutrient solution of Phaeodactylum tricornutum is pressed following prescription:
NaCl 25g/L MgSO
4.7H
2O 20mg/L
K
2HPO
4 20mg/L KNO
3 200mg/L
Phaeodactylum tricornutum algae kind and the above-mentioned nutrient solution weight ratio with 1: 15 is inoculated in the pipeline optical collector, and liquid amount is 90%, and inoculation algae kind density is about 7 * 10
4Individual cells/ml, the flue gas in power plant or cement plant is passed through desulfurization, dedusting afterwards via in the speed flow in pipes optical collector 1 of air inlet 13 with 1200 ml/min, for the little algae in the pipeline optical collector 1 provides carbon source, and control system pH is at 7-9, temperature is controlled at 15-22 ℃, and the power-assisted promotion by centrifugal pump 3 is flowed algae liquid in pipeline, via batch mixing and gas swap tank 2, be circulated back to pipeline optical collector 1.
Chemical composition described in above-mentioned little algae nutrient solution prescription is analytically pure commercial goods.
Claims (13)
1, a kind of method of utilizing little algae to absorb carbon dioxide in the flue gas, it is characterized in that: little algae algae kind that will be in exponential phase is inoculated in the pipeline optical collector (1), nutrient solution is sent into this system by batch mixing and gas swap tank (2), under the power-assisted of centrifugal pump (3) promotes, algae liquid flows in pipeline, to the carbon dioxide in the flue gas directly be contacted with algae liquid through the flue gas of desulfurization, dedusting via in air inlet (13) the flow in pipes optical collector (1); Via batch mixing and gas swap tank (2), be circulated back in the pipeline optical collector (1) again.
2, the method for utilizing little algae to absorb carbon dioxide in the flue gas according to claim 1 is characterized in that described little algae is very thin Euglena, Phaeodactylum tricornutum, little plan ball algae, chlorella, Chlorococcum, scenedesmus obliquus, haematococcus pluvialis or salt algae etc.
3, the method for utilizing little algae to absorb carbon dioxide in the flue gas according to claim 1 is characterized in that described nutrient solution is an inorganic nutrient solution, comprises inorganic nitrogen, Phos, a great number of elements, trace element, vitamin and water.
4, the method for utilizing little algae to absorb carbon dioxide in the flue gas according to claim 3, it is characterized in that inorganic nitrogen in the described nutrient solution can be one or both of ammonium chloride or urea, Phos is a potassium dihydrogen phosphate, macroelement is one or more mixtures of calcium, magnesium, iron, sodium salt, trace element is one or more mixtures of manganese, cobalt, zinc, mantoquita, and vitamin is one or more mixtures of B1, B12.
5, according to the described method of utilizing little algae to absorb carbon dioxide in the flue gas of one of claim 1-4, the cultivating condition that it is characterized in that little algae is: with algae kind and nutrient solution with 1: 5-1: 15 ratio is injected in the pipeline optical collector, the control dissolved oxygen amount is 10-20mg/L, pH value is 3.5-10, temperature is 20-35 ℃, electricity is led and is that 30-80mS, flow velocity are the 10-25 cel, and system works pressure is about 1 atmospheric pressure.
6, the method for utilizing little algae to absorb carbon dioxide in the flue gas according to claim 5, it is characterized in that the desulfurization of described process, dedusting flue gas afterwards via in the speed flow in pipes optical collector of air inlet with 500～1000 ml/min, little algae is a large amount of CO that absorb in system
2Discharge oxygen simultaneously, under the effect of centrifugal pump 3, algae liquid is pushed to batch mixing and gas swap tank 2, when the dissolved oxygen content that is monitored when dissolved oxygen detector 12 is higher than value range, start vavuum pump 7, detach gas in the system, reduce dissolved oxygen level, nutrient solution adds mouth 8 from nutrient solution and is added to batch mixing and the gas swap tank 2.
7, the method for utilizing little algae to absorb carbon dioxide in the flue gas according to claim 6, it is characterized in that with described little algae be very thin Euglena, its cultivating condition is: very thin Euglena and the nutrient solution ratio with 1: 10 is injected in the pipeline optical collector, the control dissolved oxygen amount is 15-20mg/L, pH value is 4-6, and temperature is 24-26 ℃, and electricity is led and is 45-60mS, the algae flow velocity is 15 cels, and system works pressure is about 1 atmospheric pressure.
8, the little algae of a kind of usefulness absorbs the equipment of carbon dioxide in the flue gas, it is characterized in that comprising pipeline optical collector (1), batch mixing and gas swap tank (2), centrifugal pump (3), shutoff valve (4), aerate head (5), switch valve (6), vavuum pump (7), air inlet (13), wherein, centrifugal pump (3) and shutoff valve (4), pipeline optical collector (1) is connected in series, between shutoff valve (4) and pipeline optical collector (1), insert air inlet (13), the other end of centrifugal pump (3) is connected with gas swap tank (2), and batch mixing is connected with the other end of valve (4) and pipeline optical collector (1) with the upper end of gas swap tank (2).
9, the little algae of a kind of usefulness according to claim 8 absorbs the equipment of carbon dioxide in the flue gas, it is characterized in that the switch valve (6) of the bottom connection of described pipeline optical collector (1) as the mouth of gathering, be connected with nutrient solution on the gas swap tank (2) and add mouthful (8), standby mouthful 9 of gas detection, gas liberation port 10, sample tap 11, dissolved oxygen detector 12, the inside of gas swap tank (2) is equipped with tubular type aerator (5).
10, according to Claim 8 or the little algae of 9 described a kind of usefulness absorb the equipment of carbon dioxide in the flue gas, it is characterized in that described air inlet (13) is connected with entrance point gas analyzer (17) and gas flowmeter (16); Be connected with port of export gas concentration detector (14) and gas flowmeter (15) on the gas liberation port (10).
11, according to Claim 8 or the little algae of 9 described a kind of usefulness absorb the equipment of carbon dioxide in the flue gas, the caliber that it is characterized in that described pipeline optical collector is 10-30 centimetre, can be " U " type or ring-type, and can be according to the parallel connection of actual treatment amount or the pipeline optical collector more than a group of connecting.
12, the little algae of a kind of online detection absorbs the method for carbon dioxide in the flue gas, it is characterized in that being connected with gas analyzer (17) after flue gas sources (18) is through conventional desulfurization, dust removal process, then by gas flowmeter (16), flue gas is through gas flowmeter (16), enter the pipeline optical collector (1) of both culturing microalgae system, the CO of system's air inlet end from port (13)
2Feed total amount and flow into metering and CO by flue gas
2Concentration calculates, and wherein said gas analyzer (17) links to each other with computer with gas flowmeter (16), can online detection flue gas in CO
2Concentration, and the real-time online record carries out the calculating of instantaneous and integrated flux.
13, the little algae of online detection according to claim 12 absorbs the method for carbon dioxide in the flue gas, it is characterized in that locating to be connected gas concentration detector (14) with the gas release port (10) at gas swap tank (2) top at batch mixing, the carbon dioxide that this system of on-line monitoring discharges and the composition of oxygen, gas detecting instrument (14) and gas flowmeter (15) polyphone, this system of on-line monitoring discharges the flow of gas; Gas flowmeter (14), gas analyzer (15) links to each other with computer, after real-time online record and calculating acquisition flue gas feed this both culturing microalgae system, CO
2The real time data that is absorbed and fixes.
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