CN106975311B

CN106975311B - Smoke haze removal and carbon reduction microalgae culture system and smoke treatment method

Info

Publication number: CN106975311B
Application number: CN201710334466.9A
Authority: CN
Inventors: 郑进财
Original assignee: Suzhou Industrial Park Lvshangjin Biotechnology Co ltd
Current assignee: Suzhou Industrial Park Lvshangjin Biotechnology Co ltd
Priority date: 2017-05-12
Filing date: 2017-05-12
Publication date: 2022-11-08
Anticipated expiration: 2037-05-12
Also published as: CN106975311A

Abstract

The invention discloses a cultivation flue gas haze removal and carbon reduction microalgae cultivation system which comprises a cyclone dust collector, a spraying washing tower, VOCs treatment equipment, an air pipe and a closed microalgae barrel which are connected in sequence, inorganic waste gas such as dust particles, sulfur dioxide and nitrogen oxides in flue gas and various organic waste gases can be filtered and removed, and carbon dioxide gas is used for microalgae cultivation. The smoke haze-removing and carbon-reducing microalgae cultivation system and the smoke treatment method for the system provided by the invention not only effectively purify the industrial smoke and avoid and reduce the problems of haze and greenhouse effect possibly caused by smoke pollution on the environment, but also extract carbon dioxide from the smoke for microalgae cultivation to generate economic benefit; in addition, the invention also realizes closed microalgae cultivation, reduces the influence of the change of the open environment on the growth of the microalgae, stabilizes and improves the cultivation efficiency of the microalgae.

Description

Smoke haze-removing and carbon-reducing microalgae culture system and smoke treatment method

Technical Field

The invention relates to the technical field of environmental protection, in particular to a device and a method for treating smoke by using microalgae.

Background

With the rapid development of industrial technology, the emission of industrial flue gas is also rapidly increased, so that the environmental pollution condition is increasingly serious, and the ecological circle of the whole earth is influenced. Industrial fumes, also known as industrial waste gases, contain, as main components: various dust and smoke, heavy metal compounds such as lead sulfate and mercury sulfate, carbides such as carbon monoxide and carbon dioxide, sulfides such as sulfur dioxide, carbon disulfide and hydrogen sulfide, various nitrogen oxides and the like. The substances enter human bodies through different paths of respiratory tracts, some substances directly cause harm, and some substances have an accumulation effect and can seriously harm the health of people. Wherein, dust, smoke dust and heavy metal compounds can cause haze under the condition of year-round accumulation, and the harm range of the dust, smoke dust and heavy metal compounds is greatly enlarged.

Carbon dioxide, which is the most common waste gas, often occupies a large proportion in industrial flue gas components, and the greenhouse effect is aggravated by too high carbon dioxide emission, so that the environment is worsened, and the ecological balance is seriously affected. Therefore, it is very important to limit the emission of carbon dioxide and stabilize the carbon dioxide content in the atmosphere for environmental protection.

Since the plants can perform photosynthesis, absorb carbon dioxide in the air and release oxygen, the content of carbon dioxide can be effectively reduced by planting plants, afforestation and other methods. On one hand, plants such as general trees need to occupy a large land area, and large-scale tree planting is difficult to realize in places such as cities with serious carbon dioxide emission; on the other hand, the planting and maintenance work of plants is often more cumbersome, but the benefit of direct harvesting is less, and the economy is lower. In consideration of all aspects, the cultivation technology of algae gradually becomes a new industry due to high environmental protection and high economy, and makes great contribution to solving the problem of excessive carbon dioxide emission.

The existing algae cultivation technology mainly adopts open-air cultivation, but the existing algae cultivation is difficult to sort and collect in the open air, wherein healthy and strong adult plants, weak plants with diseases and insect pests, old plants which gradually age and young seedlings which do not grow are mixed, the required microalgae adult plants cannot be obtained, and the efficiency of subsequent production operation is influenced by many over-aged plants, diseases or over-young seedlings which are obtained at the same time. In addition, in open-air cultivation, the nutrients are diluted by weather factors such as rainy seasons and the like, so that the growth nutrients are insufficient, and if the weather temperature difference is too large, the algae growth is damaged due to supercooling or overheating.

Disclosure of Invention

In order to solve the problems that the smoke pollutes the environment, haze and greenhouse effect are caused and aggravated, and outdoor culture of algae is affected by environmental changes, the invention provides a smoke haze removing and carbon reducing microalgae culture system and a smoke treatment method for the system.

The smoke haze-removing and carbon-reducing microalgae culture system comprises a cyclone dust collector, a spraying washing tower, VOCs treatment equipment, an air pipe, an algae barrel and the like which are sequentially connected.

The cyclone dust collector is used for carrying out gas-solid separation on the flue gas discharged from the chimney to remove large-particle dust in the flue gas, and the flue gas after dust removal is input into the spray washing tower.

And the spray washing tower is used for spraying and washing the dedusted flue gas to remove fine dust particles, sulfide, nitrogen oxide and other acid gases in the flue gas, and the washed flue gas is input into the VOCs treatment equipment.

VOCs treatment facility has atomizing oxygenation system and nanometer microbubble system, can use the super oxygen nanometer microbubble technique to handle with the flue gas after spraying the washing, decomposes organic waste gas wherein, inputs the gas after handling in the trachea. The treated gas is mainly CO2 gas and may contain a small amount of SO2, CO, NO2 and other nitrogen oxides, wherein the volume concentration of the CO2 gas is 3-20%.

The air pipe can carry out shunting and/or pressurization treatment on the gas and output the gas into the algae barrel according to requirements. The algae bucket is closed, and microalgae, generally blue algae or green algae or chlorella, is cultured in the algae bucket and is used for photosynthesis to absorb gas output from an air pipe.

The inside of algae bucket is equipped with light source device, aeration equipment and agitating unit, wherein aeration equipment with the efflux pipe all is connected with the trachea.

The light source device comprises a plurality of vertical LED lamp posts, the top of each LED lamp post is provided with a power supply, light emitted by the LED lamp posts is generally matched with red light and blue light, and the spectrum is 500-800nm. Therefore, necessary illumination conditions can be provided for the photosynthesis of the microalgae.

The aeration device comprises a plurality of aeration discs arranged at the bottom of the algae barrel and an aeration conduit connected with each aeration disc, and the aeration conduits are communicated with the air pipe. Thus, tiny bubbles can be formed to provide gas necessary for photosynthesis of microalgae.

Agitating unit includes many efflux pipes, the efflux pipe has vertical setting and both ends syntropy open-ended drain pipe from top to bottom to and one end with the drain pipe middle section is linked together and the other end with the intake pipe that the trachea is linked together. And a horizontal extension pipe is arranged at the upper port and the lower port of the liquid outlet pipe. Therefore, the stirring effect can be generated, the contact probability of the bubbles and the microalgae can be increased, and the efficiency of photosynthesis of the microalgae is improved.

The smoke haze-removing and carbon-reducing microalgae culture system and the smoke treatment method for the system can filter and remove inorganic waste gas such as dust particles, sulfur dioxide, nitric oxide and the like and various organic waste gas in smoke to obtain carbon dioxide gas and use the carbon dioxide gas in microalgae culture. The system and the method not only effectively purify the flue gas and avoid and reduce the problems of haze and greenhouse effect possibly caused by the pollution of the flue gas to the environment, but also extract carbon dioxide from the flue gas for microalgae cultivation to generate economic benefit. In addition, the invention also realizes closed microalgae cultivation, reduces the influence of the change of the open environment on the growth of the microalgae, stabilizes and improves the cultivation efficiency of the microalgae.

Drawings

FIG. 1 is a flow chart of a smoke haze removal and carbon reduction microalgae cultivation system of the invention;

FIG. 2 is a schematic view of the construction of a cyclone dust collector of the present invention;

FIG. 3 is a schematic structural view of a spray scrubber according to the present invention;

FIG. 4 is a schematic diagram of the operation of the VOCs treatment apparatus of the present invention;

FIG. 5 is a schematic diagram of the VOCs treatment apparatus of the present invention;

FIG. 6 is a partial cross-sectional view of the algae basket of the present invention;

fig. 7 is a top view of the fluidic tube distribution of fig. 6.

In the figure: a cyclone dust collector 1, a spray washing tower 2, a VOCs device 3, an air pipe 4 and an algae barrel 5;

the device comprises an air inlet pipe 11, a cylinder 12, a cone 13, an ash discharge port 14, a backflow zone 15, an exhaust pipe 16, an external cyclone 17, an internal cyclone 18 and a secondary flow 19;

a washing liquid inlet 21, a nozzle 22, a gas inlet 23, a sewage discharge outlet 24, a water replenishing port 25, a circulating pump 26, a circulating water inlet 27, a demister 28 and a gas outlet 29;

the system comprises a sand filtration and water circulation system 31, an air inlet 32, an atomization oxygenation system 33, a nanometer micro-bubble system 34, a reaction tank 35, an axial flow fan 36, an air outlet 37, a detection port 38, a PLC (programmable logic controller) control system 39, an auxiliary water tank 311, a circulating pump 312, a slag discharge port 313, a low-pressure pump 331, an anion low-pressure pipeline system 332, an anion generator 333, a high-pressure pump 341, a micro-bubble high-pressure pipeline system 342 and a micro-bubble generator 343;

the device comprises a barrel cover 51, an LED lamp post 52, a power supply 53, an aeration disc 54, an aeration conduit 55, a jet pipe 56, a liquid outlet pipe 561, an air inlet pipe 562 and an extension pipe 563.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 schematically shows a flow diagram of a gas haze removal and carbon reduction microalgae cultivation system according to the invention. As shown in the figure, the smoke haze-removing and carbon-reducing microalgae cultivation system comprises a cyclone dust collector, a spray washing tower, VOCs treatment equipment, an air pipe, an algae barrel and the like which are sequentially connected. Industrial flue gas discharged from a factory chimney and the like sequentially passes through a cyclone dust collector, a spray washing tower and VOCs treatment equipment to remove various pollutants such as dust, smoke dust and acid gas in the industrial flue gas, and the remaining CO2 gas is input into an algae barrel through an air pipe to supply microalgae for photosynthesis and generate and output fresh oxygen. In addition, the ash in the cyclone dust collector and the algae mud in the algae barrel can be mixed to prepare organic fertilizer for utilization, and the cleaning water of the algae barrel can also be recycled to the spray washing tower for spraying after being filtered, so that the cyclic utilization is realized.

FIG. 2 shows a schematic structural diagram of a cyclone dust collector of the smoke haze-removing and carbon-reducing microalgae cultivation system. The cyclone dust collector is one kind of dust collector used in industry and has the principle that after dust-containing airflow enters the dust collector, the airflow rotates inside the dust collector, and the dust in the airflow moves to the outer wall under the action of centrifugal force to reach the wall and falls to the bottom along the wall under the action of airflow and gravity to separate.

As shown in the figure, the flue gas enters the cylinder 12 from the air inlet pipe 11, rotates along with the rotation of the cylinder 12, most of the flue gas spirally moves from top to bottom of the cone along the wall of the cylinder to form a descending outward rotating air flow 17, dust particles with the density far higher than that of the gas are thrown to the wall by the centrifugal force generated in the rotating process, and once the dust particles contact the wall, the dust particles lose inertia force and fall along the wall of the cone 13 by the momentum of the inlet speed and the self gravity and then fall from the dust outlet 14. And the outward swirling air flow 17 reaches the return flow zone 15 at the bottom of the cone 13, rotates along the axial center part of the dust remover and upwards to form an ascending inward swirling air flow 18, and is discharged from an exhaust pipe 16 of the dust remover.

Another small part of the outer swirling air flow 17 flows upward and then flows downward along the outer side of the exhaust pipe 16, and when reaching the lower end of the exhaust pipe 16, it reverses upward to form a secondary flow 19, and is discharged from the exhaust pipe together with the rising central air flow, and the dust particles dispersed therein are also carried away.

The cyclone dust collector performs gas-solid separation on the smoke discharged by the chimney to remove large-particle dust in the smoke, generally various dust and smoke with the particle size of more than 5-15 microns, including heavy metal compounds such as lead mercury sulfate and the like. After dust removal, the flue gas can be input into a spray washing tower.

FIG. 3 shows a schematic structural diagram of a spray washing tower of the smoke haze-removing and carbon-reducing microalgae cultivation system according to the invention. As shown in the figure, the spray washing tower 2 is a wet dust removal device, and the principle is that washing liquid is input from a washing liquid inlet 21 and is atomized into fine liquid drops through a nozzle 22 to be uniformly sprayed downwards, dust-containing gas enters from a gas inlet 23 at the lower part of the spray tower and flows from bottom to top to be in countercurrent contact with the washing liquid, and the dust particles are in contact collision with water drops to be mutually condensed or agglomerated, so that the weight of the dust particles is greatly increased and the dust particles are settled down under the action of gravity. The collected dust is settled by gravity in the liquid storage tank to form high solid-containing concentrated phase liquid at the bottom and is discharged periodically through a sewage discharge port 24 for further treatment, wherein part of clear liquid and supplemented clear liquid input from a water supplementing port 25 are introduced into the spray washing tower 2 from a circulating water inlet 27 through a circulating pump 26 for spray washing together, so that the recycling is realized, and the liquid consumption and the secondary sewage treatment capacity are reduced. The cleaned gas after spray washing is discharged from a gas outlet 29 at the top of the tower after fine liquid droplets carried by the gas are removed by a demister 28.

The flue gas after dust removal in the invention can remove fine dust particles below 5 microns in the flue gas by spray washing of the spray washing tower, and most of acid gases in the flue gas, mainly sulfides such as SO2 and the like and some nitrogen oxides including NO and NO2, can be neutralized by adopting alkaline washing liquid, but generally, the acid gases are difficult to be completely clear and still exist in a small amount. The washed flue gas takes organic waste gas and CO2 as main components and is input into VOCs treatment equipment.

FIG. 4 shows a working principle diagram of VOCs treatment equipment of the smoke haze-removing and carbon-reducing microalgae cultivation system according to the invention. VOCs, which are volatile organic compounds generally called organic waste gases, are also one of the main components of the scrubbed flue gas, and a VOCs treatment plant is an industrial plant for decomposition treatment of organic waste gases. For the treatment of organic waste gas, the conventional technologies mainly include thermal destruction, liquid absorption, activated carbon adsorption, low-temperature condensation, biotransformation, and photocatalytic oxidation. As shown in the figure, the VOCs treatment equipment in the invention carries out degradation treatment on organic waste gas in flue gas sequentially through an atomization oxygenation system and a nanometer microbubble system, and discharges the treated substances through an axial flow fan, and the whole treatment and discharge process is controlled through a PLC control system. In addition, in the treatment process, an external water source of tap water is treated by a sand filtration and water circulation system and then is introduced into the atomization oxygenation system and the nanometer microbubble system to keep sufficient water amount, and the sand filtration and water circulation system can discharge some organic waste gas, paint mist decomposition residues and a small amount of waste water.

Therefore, the method for degrading the organic waste gas by adopting the atomization oxygenation system and the nanometer microbubble reduction system is used for treating the flue gas, and the core technology of the method is the superoxide nanometer microbubble technology.

The nano micro bubbles are bubbles with the diameter of about 10 microns to hundreds of nanometers when the bubbles occur, are between micro bubbles and nano bubbles, have physical and chemical characteristics which are not possessed by the conventional bubbles, such as surface electrification, easy generation of a large number of free radicals, high mass transfer efficiency, high gas dissolution rate and the like. The principle of degrading organic waste gas by the nano micro bubbles is as follows: nanometer-scale microbubbles are generated using a nanometer microbubble generating device. The nanometer micro-bubbles can be generated in a very short time (about 10) due to the cavitation effect ^-9 Second), a large amount of heat (about 4000 k) and extremely high air pressure (about 1800 atm) are instantaneously generated, a large amount of hydroxyl, free radicals and the like are released in water, and the organic gases are subjected to physical and chemical reactions such as mechanical shearing, pyrolysis, free radical oxidation, supercritical water oxidation and the like, so that the effects of decomposing and removing the organic gases are achieved.

Compared with other common organic waste gas treatment methods, the superoxide nanometer microbubble technology has the advantages of being capable of being used for organic waste gas with various concentrations, free of pretreatment, simple to operate, low in operation and construction cost, short in construction period, small in occupied area, free of secondary pollution and the like.

FIG. 5 shows a schematic structural diagram of a VOCs treatment device of the flue gas haze removal and carbon reduction microalgae cultivation system according to the invention. As shown in the figure, VOCs treatment facility 3 includes flue gas treatment channel, sand filtration and water circulating system 31 and with the air inlet 32 of flue gas treatment channel bottom intercommunication, this flue gas treatment channel is equipped with atomizing oxygenation system 33, nanometer microbubble system 34 and reaction tank 35 from bottom to top in proper order, reaction tank 35 can be equipped with about two and through axial fan intercommunication, air outlet 37 has been seted up on the top of flue gas treatment channel, near air outlet 37 department still is equipped with detection mouth 38. The sand filtration and water circulation system 31 includes a sub-tank 311 and a circulation pump 312 communicated with the sub-tank 311. The atomization oxygenation system 33 comprises a low-pressure pump 331, a negative ion low-pressure pipeline system 332 and a negative ion generator 333 connected with one end of the negative ion low-pressure pipeline system 332, and the negative ion generator 333 is located inside the flue gas treatment channel. The nano micro bubble system 34 includes multiple sets of high pressure pumps 341, a micro bubble high pressure piping system 342, and a micro bubble generator 343, wherein the micro bubble generator 343 is located inside the flue gas treatment channel and above the negative ion generator 333. The water is introduced into the sand filtration and water circulation system 31 from the water source, wherein the sand filtration and water circulation system 31 is introduced into the sub-tank 311 for equipment use after purifying the water, the purified impurities can be circularly purified by the circulation pump 312, and finally some residual organic waste gas and paint mist decomposition residues and a small amount of waste water are discharged from the slag discharge port 313.

The flue gas to be treated is introduced into the equipment from the gas inlet 32, is subjected to primary treatment by the atomization oxygenation system 33 to form a gas-liquid mixture, and then enters the nanometer microbubble system 34 for degradation, and the technology used in the whole process can be called as the superoxide nanometer microbubble technology. Wherein, the atomization oxygenation system 33 is used for producing superoxide environment, the nanometer microbubble system 34 is used for producing microbubbles, and the specific reaction is carried out in the reaction tank 35.

Organic waste gas in the flue gas treated by the superoxide nanometer microbubble technology is degraded into CO2 gas and moisture, the treated gas can be discharged from the air outlet 37 by using the axial flow fan 36, and the air outlet 37 can be provided with a detection port 38, so that part of the gas is discharged from the detection port 38 to detect the treatment effect.

The work and reaction processes of all systems in the VOCs treatment equipment 3 are carried out under the control of the PLC control system 39, and the gas discharged from the air outlet 37 is conveyed into the air pipe 4. The gas component in this case is mainly CO2 gas, and the volume concentration thereof is 3% to 20%, and the content of other impurity gases is extremely low. The gas pipe 4 can receive the gas input from the VOCs treatment equipment and continuously transmit the gas to the algae barrel 5, and the microalgae in the algae barrel 5 can absorb a large amount of CO2 to carry out photosynthesis and form nutrients necessary for the growth of the microalgae.

The algae vat 5 needs to receive gas from a plurality of different locations and often different locations need to receive gas at different flow rates, for which purpose corresponding devices are provided in the gas pipe 4 to enable the gas to be diverted and/or pressurised and delivered to the different receiving locations of the algae vat as required.

FIG. 6 shows a structural diagram of an algae bucket of a smoke haze removal and carbon reduction microalgae cultivation system according to the invention. As shown in the figure, a cover 51 is arranged above the algae bucket 5, the algae bucket 5 is closed after the cover 51 is installed, the algae bucket 5 is filled with swimming water, microalgae is cultivated in the water, and the microalgae is generally selected from blue algae, green algae or chlorella and can absorb CO2 in gas output from an air pipe to carry out photosynthesis and output oxygen. The interior of the algae barrel 5 is also provided with some auxiliary equipment for microalgae cultivation, which mainly comprises a light source device, an aeration device and a stirring device.

The light source device comprises a plurality of vertically fixed LED lamp posts 52, preferably four LED lamp posts are uniformly distributed at each part in the algae barrel, the top of each LED lamp post 52 is provided with a power supply 53, and the power supply 53 can provide power to enable the LED lamp posts 52 to emit light so as to provide necessary illumination conditions for the photosynthesis of microalgae. The light emitted by the LED lamppost 52 is generally a combination of red light and blue light, and the spectrum is 500-800nm, which is beneficial to the growth of microalgae. In particular, the power supply 53 is protected from water and is kept as close to the water surface as possible.

The aeration device mainly comprises a plurality of aeration discs 54 arranged at the bottom of the algae barrel and an aeration conduit 55 connected with all the aeration discs 54, wherein the conduit 55 is vertically fixed in the algae barrel, the top end of the conduit is communicated with the air pipe 4 through a barrel cover 51, the bottom end of the conduit extends to the bottom of the algae barrel 5 and extends to the side to form a plurality of branches, and the preferred number of the aeration discs 54 is two, and the two aeration discs can be respectively arranged on each branch.

The aeration conduit 55 is capable of receiving the gas input from the gas pipe 4 and delivering it to the respective aeration disks 54. The aeration plate 54 is a device capable of promoting the exchange of substances between gas and liquid, and the gas C is transferred into the water through the aeration plate 54, and can be transferred from gas phase to liquid phase, so as to form tiny bubbles, and the bubbles can contact the surface of the microalgae when moving in the water, thereby providing necessary CO2 for the photosynthesis of the microalgae.

The stirring device comprises a plurality of jet pipes 56, each jet pipe 56 comprises an outlet pipe 561 and an inlet pipe 562, the outlet pipes 561 and the inlet pipes 562 are both vertically and fixedly arranged in the algae barrel, the upper end and the lower end of each outlet pipe 561 are opened towards the same lateral direction, the bottom end of each outlet pipe 561 is positioned at the bottom of the algae barrel 5, and the top end of each outlet pipe is positioned a short distance above the water surface; and one end of the air inlet pipe 562 is communicated with the middle section of the liquid outlet pipe 561, and the other end thereof extends to be communicated with the air pipe 4 through the barrel cover 51.

When the jet pipe 56 works, the gas inlet pipe 562 can receive the gas input from the gas pipe 4 and convey the gas into the liquid outlet pipe 561, and since the liquid outlet pipe 561 is mostly positioned in the water, the water in the liquid outlet pipe 561 can be pushed by the gas input from the gas inlet pipe to be jetted from the upper end and the lower end of the liquid outlet pipe 561. The water sprayed by the plurality of jet pipes 56 forms a vortex in the algae bucket, so that a stirring effect is generated, the bubbles and the microalgae move along with the water, the contact probability of the bubbles and the microalgae can be increased, and the efficiency of photosynthesis of the microalgae is improved.

Generally, in order to effectively form the vortex, it is often necessary to have a large flow rate of the gas input from the gas pipe 562, and in this regard, the gas input into the jet pipe 56 may be pressurized in the gas pipe 4 in a targeted manner, or some other means may be adopted, such as installing a venturi or other device capable of increasing the flow rate of the gas on the jet pipe 56. In addition, in order to increase the water spraying distance, a horizontal extension pipe 563 may be installed at the upper and lower ports of the liquid outlet pipe 561.

Fig. 7 shows a top view of the distribution of a plurality of jet pipes in an algae basket. As shown in the figure, the openings of the liquid outlet tube 561 of the plurality of jet pipes 56 are distributed along the same flow direction, which may be clockwise or counterclockwise, so that when the jet pipes 56 jet water flow through the liquid outlet tube 561 and the extension pipe 563, a vortex can be formed in water more effectively, thereby promoting the stirring effect.

After the microalgae is cultured to be mature, algae-water separation and harvesting can be carried out, namely, the mature microalgae is separated from water and is collected and harvested from the algae barrel. Wherein the algae-laden water separation and collection mainly comprises the following processes: introducing the stock solution in the algae barrel into an algae solution collecting tank; then an overflow method is carried out or a lift pump is used for guiding the algae liquid into an ultrafiltration membrane pool, and the algae liquid can be intercepted in the membrane pool due to the membrane precise filtration principle, so that the algae liquid with higher concentration is enriched, concentrated and precipitated in the membrane pool and is separated from the water with lower concentration. When the algae liquid is precipitated to a certain amount, for example, more than half, the formed algae mud can be discharged firstly for harvesting, and then the algae-water separation work is continued.

After the reaction in the algae bucket, most of the CO2 in the gas is used for photosynthesis of the microalgae, and other acid gases such as SO2, NO2 and the like are further removed, wherein the gases such as SO2 and the like may be completely removed.

Table 1 shows several measurements of the content of various pollutants in flue gas immediately after discharge and after treatment by the system. The main pollutant gas components in the flue gas are NO2, NO, SO2, CO2 and the like, and in addition, other nitrogen oxides can be expressed by using NOX. In addition, as the dates of several detections are not completely the same and are influenced by factors such as weather, some data have a considerable gap from other data.

Table 1 detection data of various pollution gas contents before and after flue gas treatment

As shown in Table 1, the content of each pollutant gas component in the flue gas immediately after the discharge was high, wherein the content of NO2 was generally 30 to 80mg/m ³ The NO content is generally 80-160mg/m ³ The content of other nitrogen oxides NOx is generally about 150-280mg/m, and the content of SO2 is higher, often 280-380mg/m ³ And the volume concentration of CO2 is generally between 5 and 6 percent.

In table 1, the final content of each pollutant gas measured in the algae bucket after a series of treatment steps of the flue gas treatment method of the system, mainly the steps of spraying and washing the pollutant gas components, cultivating microalgae and the like, can also be obviously obtained, wherein the content of NO2 is generally 3mg/m ³ The content is 0 in some cases, and the total removal rate reaches 96.2%; the content of NO is not more than 11mg/m ³ About and always goThe removal rate reaches 92.0 percent; the content of other nitrogen oxides NOX is generally not more than 20mg/m, and the total removal rate is 93.0 percent; SO2 is removed more thoroughly, the content is 0 in most cases, and the total removal rate even reaches 99.8%; CO is generally oxidized into CO2 in the treatment process, and the volume concentration of the CO2 is reduced to about 0.2% after the CO2 is used for cultivating microalgae in the algae bucket, and the total removal rate is 96.2%. From the data presented in the tables, it can be seen that the treated individual pollutant gases are greatly reduced in content, sometimes even completely eliminated.

In addition to the detection of the flue gas treatment condition of the system by the manufacturer of the system, the manufacturer also entrusts Jiangsu Huachuang detection technology service company Limited to detect the waste gas of the system and issues an authoritative detection report, wherein the report number is UHTI1703EV0029. The exhaust gas detection results in the detection report are shown in table 2.

Table 2 exhaust gas test results of test reports

As shown in table 2, it can be proved that the system has a high removal effect on the main pollutant substances and gases such as particulate matters, mercury and compounds thereof, nitrogen oxides, sulfur dioxide, carbon dioxide and the like in the exhaust gas discharged from the chimney, and especially has a 99% removal rate on particulate matters mainly having a solid structure; and the removal rate of the carbon dioxide is 98 percent, which shows that the carbon dioxide plays a full role in microalgae cultivation. Therefore, the system can realize extremely excellent smoke treatment effect.

Each analysis item of the test report was analyzed with reference to the reference standard and analysis method specified in the country, and is specifically shown in table 3.

Table 3 description of test reports

In addition, because the algae bucket is closed, the cultivation process needs to be monitored by a computer, and the conditions of the pH value, the CO2 content, the flowing rate, the temperature, the illumination, the salinity and the like can be adjusted by the computer. The closed microalgae cultivation is different from the prior open microalgae cultivation, avoids the influence of natural environment factors such as dry seasons in rainy seasons, excessive temperature difference and the like on the growth of the microalgae, stabilizes the growth speed of the microalgae, effectively improves the yield of the microalgae, and is also convenient for the classified collection of finished microalgae.

The microalgae culture system can gradually treat the flue gas to avoid the pollution of the flue gas to the environment, can release oxygen from the algae barrel to improve the air quality, and has important application in the fields of medicines, foods, energy sources, biotechnology, environmental detection and purification lamps, thereby realizing considerable economic benefits.

The foregoing are only some embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. Flue gas removes haze and subtracts carbon microalgae farming systems, its characterized in that: the system comprises

The cyclone dust collector (1) can introduce the discharged flue gas and remove large-particle dust in the flue gas;

the spray washing tower (2) is connected with the cyclone dust collector (1) and can remove fine dust particles and part of acid gas in the flue gas;

the VOCs treatment equipment (3) is connected with the spray washing tower (2) and can decompose organic waste gas in the flue gas;

the gas pipe (4) is connected with the VOCs treatment equipment (3) and can be used for shunting and/or outputting gas in a pressurizing way;

the algae barrel (5) is connected with the air pipe (4), is internally cultivated with microalgae and can absorb gas output from the air pipe;

the VOCs treatment equipment (3) comprises an atomization oxygenation system (33) and a nanometer microbubble system (34), and the flue gas is treated by using a super-oxygen nanometer microbubble technology;

algae bucket (5) are confined, and inside is equipped with light source device, aeration equipment and a plurality of agitating unit, aeration equipment with agitating unit all with trachea (4) are connected, agitating unit includes many efflux pipe (56), efflux pipe (56) have vertical setting and upper and lower both ends syntropy open-ended drain pipe (561), and one end with drain pipe (561) middle section is linked together and the other end with intake pipe (562) that trachea (4) are linked together, light source device includes many vertical LED lamp pole (52), every the top of LED lamp pole (52) all is equipped with power (53).

2. The smoke haze-removing and carbon-reducing microalgae cultivation system as claimed in claim 1, wherein the smoke haze-removing and carbon-reducing microalgae cultivation system comprises: the aeration device comprises a plurality of aeration discs (54) placed at the bottom of the algae barrel (5) and an aeration conduit (55) connected with each aeration disc (54), wherein the aeration conduit (55) is communicated with the air pipe (4).

3. The microalgae cultivation system capable of removing haze and reducing carbon by using flue gas as claimed in claim 1, wherein the system comprises: and a horizontal extension pipe (563) is arranged at the upper port and the lower port of the liquid outlet pipe (561).

4. A flue gas treatment method is characterized in that: the method comprises the following steps:

1) Cyclone dust removal: introducing the flue gas into a cyclone separator (1) for gas-solid separation to remove large-particle dust in the flue gas;

2) Spraying and washing: introducing the flue gas subjected to dust removal in the step 1) into a spray washing tower (2) for spray washing to remove fine dust particles and part of acid gas in the flue gas;

3) VOCs treatment: introducing the flue gas subjected to spray washing in the step 2) into VOCs treatment equipment (3), and treating by using a super-oxygen nanometer microbubble technology to decompose organic waste gas in the flue gas;

4) And (3) microalgae cultivation absorption: introducing the gas treated in the step 3) into an algae barrel (5) for culturing the microalgae through an air pipe (4), and enabling the microalgae to carry out photosynthesis by matching with a light source;

5) Algae-laden water separation and harvesting: separating the cultivated mature microalgae from water, and collecting the microalgae from the algae barrel (5).

5. The flue gas treatment method according to claim 4, wherein: part of the acid gas in step 2) comprises sulfides and nitrogen oxides.

6. The flue gas treatment method according to claim 4, wherein: CO in the gas treated by the step 3) ₂ The volume concentration of the gas is 3% -20%.

7. The flue gas treatment method according to claim 4, wherein: the light source in the step 4) is red light and blue light matched, and the spectrum is 500-800nm.

8. The flue gas treatment method according to claim 4, wherein: the microalgae in the step 4) is blue algae or green algae.