Carbon reduction device for kiln tail waste gas of cement enterprise

Abstract

The utility model discloses a cement enterprise kiln tail waste gas carbon reduction device which comprises a superfine filtration dust collector, a harmful component removal tower and an algae culture module, a gas inlet of the superfine filtration dust collector is connected with a kiln tail chimney through a pipeline A, and a gas outlet of the superfine filtration dust collector is communicated with a gas inlet of the harmful component removal tower through a pipeline B; a gas outlet of the harmful component removal tower is communicated with the algae culture module through a pipeline C. An air taking fan is arranged on the pipeline C. Kiln tail waste gas in the kiln tail chimney enters the superfine filtration dust collector to be filtered, then harmful components are removed through the harmful component removal tower, and then the kiln tail waste gas is introduced into the algae culture module. And the carbon dioxide in the algae culture module is absorbed by algae in the algae culture module. Firstly, the algae absorb carbon dioxide through photosynthesis and convert the carbon dioxide into biomass of the algae, so that the amount of carbon dioxide discharged to the atmosphere in the industrial production process is reduced; in addition, in the growth process of the algae, a large amount of carbon dioxide is fixed, and grease and biomass of the algae are accumulated.

Description

Technical Field

[0001] The utility model relates to a carbon dioxide reduction device for the exhaust gas at the kiln tail of a cement enterprise, belonging to the technical field of cement kiln tail exhaust gas treatment. Background Art

[0002] In the production process, cement production enterprises use a large amount of limestone as the main raw material. The main component of limestone is calcium carbonate. In the cement calcination process, calcium carbonate is converted into calcium oxide and a large amount of carbon dioxide gas is released. Its content accounts for about 21%-28% of the total chimney gas volume. Therefore, cement production enterprises are an important source of carbon emissions. The emission structure of the exhaust gas at the kiln tail of existing technology cement enterprises is as Figure 1 shown, which includes a kiln tail dust collector 23 and a kiln tail exhaust fan 24. The cement rotary kiln is connected to the kiln tail dust collector 23, the kiln tail exhaust fan 24, and the kiln tail chimney 5 in sequence through an exhaust gas pipeline 9. The kiln tail exhaust fan 24 extracts the kiln tail exhaust gas in the cement rotary kiln. After the dust particles in it are absorbed by the kiln tail dust collector 23, it is discharged from the kiln tail chimney 5. The carbon dioxide content in the kiln tail exhaust gas discharged by this kind of emission structure of the kiln tail exhaust gas of cement enterprises is high. Therefore, the carbon dioxide emission is large, which is not conducive to the reduction of carbon emissions. Summary of the Invention

[0003] The purpose of the utility model is to provide a carbon dioxide reduction device for the exhaust gas at the kiln tail of a cement enterprise, and solve the technical problem of large carbon dioxide emissions in the exhaust gas at the kiln tail of existing technology cement enterprises.

[0004] To solve the above problems, the technical solution adopted by the utility model is: a carbon dioxide reduction device for the exhaust gas at the kiln tail of a cement enterprise, including an ultra-fine filtration dust collector, a harmful component removal tower, and an algae cultivation module. The air inlet of the ultra-fine filtration dust collector is connected to the kiln tail chimney by pipeline A in the use state. The air outlet of the ultra-fine filtration dust collector is communicated with the air inlet at the lower part of the harmful component removal tower by pipeline B. The air outlet at the upper part of the harmful component removal tower is communicated with the algae cultivation module by pipeline C. An air extraction fan is arranged on pipeline C. The kiln tail exhaust gas in the chimney enters the ultra-fine filtration dust collector for filtration and then the harmful components are removed by the harmful component removal tower, and then it is introduced into the algae cultivation module, and the carbon dioxide in it is absorbed by the algae in the algae cultivation module. The utility model removes the fine particulate dust in the exhaust gas through the ultra-fine filtration dust collector, reduces the dust concentration in the exhaust gas, then removes the harmful components in the gas by the harmful component removal tower, and introduces it into the algae cultivation module. The carbon dioxide in it is absorbed by the algae cultivation module, achieving the purpose of reducing carbon dioxide in the kiln tail exhaust gas of the cement rotary kiln, thereby reducing the carbon emission in the exhaust gas discharged by the cement rotary kiln.

[0005] As a further improvement of the present utility model, it further includes a heat exchanger, which is arranged on the exhaust gas pipeline connecting the cement rotary kiln and the kiln tail chimney. The pipeline C includes pipeline CⅠ and pipeline CⅡ. Among them, pipeline CⅠ connects the air outlet of the harmful component removal tower and the air inlet of the heat exchanger, and pipeline CⅡ communicates with the air outlet of the heat exchanger and the algae cultivation module. The air intake fan is arranged on pipeline CⅡ. The gas from which harmful components are removed by the harmful component removal tower exchanges heat with the exhaust gas discharged from the cement rotary kiln through the heat exchanger to increase the temperature and then enters the algae cultivation module. In the present utility model, the gas after the harmful components are removed by the harmful component removal tower has a lower temperature, while the exhaust gas discharged from the cement rotary kiln has a higher temperature. Through the heat exchange between the two, on the one hand, the temperature of the discharged kiln tail exhaust gas is reduced, and on the other hand, the temperature of the gas for algae absorption is increased, making full use of the heat of the tail exhaust gas.

[0006] As a further improvement of the present utility model, it further includes pipeline D and a temperature regulating air valve. The two ends of pipeline D are respectively connected to pipeline CⅠ and pipeline CⅡ, and the temperature regulating air valve is arranged on pipeline D. Among them, the air intake fan is located between the connection point of pipeline CⅡ and pipeline D and the algae cultivation module. The amount of gas entering pipeline CⅡ after heat exchange through the heat exchanger and the gas directly entering pipeline CⅡ from pipeline D is adjusted through the temperature regulating air valve, and the temperature of the gas entering the algae cultivation module is adjusted. By setting pipeline D and the temperature regulating air valve in the present utility model, part of the gas can directly enter pipeline CⅡ without passing through the heat exchanger. The temperature of this part of the gas is relatively low and is mixed with the high-temperature gas entering pipeline CⅡ after heat exchange, so that the mixed gas reaches the most suitable temperature for algae growth. While being beneficial to the growth of algae, the algae can absorb more carbon dioxide.

[0007] As a further improvement of the present utility model, it further includes a temperature sensor, which is arranged on pipeline CⅡ and is located between the air intake fan and the algae cultivation module, and is used to detect the temperature of the gas entering the algae cultivation module. By setting the temperature sensor to detect the temperature of the gas entering the algae cultivation module in the present utility model and adjusting the temperature of the gas entering the algae cultivation module according to the temperature value, the temperature of the gas entering the algae cultivation module is made most suitable for the growth of algae.

[0008] As a further improvement of the present utility model, a spraying device is arranged at the top of the harmful component removal tower. The spraying device is connected to a container containing the removal agent, and the spraying device sprays the removal agent into the harmful component removal tower, contacts with the gas flowing upward from the bottom in the harmful component removal tower, removes the harmful components in the gas and reduces the temperature of the gas. By spraying the removal agent into the harmful component removal tower through the spraying device in the present utility model, the sprayed agent flows downward, opposite to the direction of the upward moving gas, so that the removal agent and the gas are in full contact, thereby making the removal of harmful components in the gas more thorough.

[0009] As a further improvement of the present utility model, an air intake valve is provided on pipeline A for adjusting the air intake volume from the kiln tail chimney. By setting the air intake valve in the present utility model, the air intake volume from the kiln tail chimney is controlled, so that the air intake volume can be appropriately set according to the ability of the harmful component removal tower to remove harmful components, maximizing the removal rate of harmful components and facilitating the cultivation of algae.

[0010] As a further improvement of the present utility model, the algae cultivation module includes a plurality of cultivation containers for containing algae nutrient water. The cultivation containers include an arc-shaped connecting pipe, and a long pipe and a short pipe that are vertically arranged and parallel. The bottom ends of the long pipe and the short pipe are respectively communicated with both ends of the connecting pipe. The top end of the short pipe is communicated with the long pipe by an inclined pipe, and the end of the inclined pipe for communicating with the long pipe is inclined upward. The top of the long pipe is open, and the lower part of the short pipe is communicated with pipeline CⅡ through a branch pipe. By setting a plurality of cultivation containers in the present utility model, the plurality of cultivation containers simultaneously absorb carbon dioxide in the tail gas in pipeline CⅡ, improving the carbon reduction effect of the kiln tail waste gas generated by the cement rotary kiln. The structure of the cultivation containers in the present utility model enables the algae nutrient solution to circulate in the cultivation containers, and part of the gas circulates with the flow of the algae nutrient solution, increasing the contact time between the gas and the nutrient solution and further improving the carbon reduction effect of the present utility model.

[0011] As a further improvement of the present utility model, a kiln tail dust collector is provided on the waste gas pipeline connecting the cement rotary kiln and the kiln tail chimney for removing large-particle dust in the kiln tail waste gas. Since air is taken from the kiln tail chimney in the present utility model, a considerable part of the kiln tail waste gas still directly discharges from the kiln tail chimney. Therefore, by setting the kiln tail dust collector in the present utility model, the dust in the kiln tail waste gas can be removed, reducing air pollution.

[0012] As a further improvement of the present utility model, a kiln tail exhaust fan is provided on the waste gas pipeline connecting the cement rotary kiln and the kiln tail chimney. The kiln tail exhaust fan is arranged between the kiln tail dust collector and the kiln tail chimney for discharging the kiln tail waste gas from the cement rotary kiln into the kiln tail chimney. By setting the exhaust fan in the present utility model, the kiln tail waste gas is drawn from the cement rotary kiln into the kiln tail chimney, which is more conducive to the discharge of the waste gas in the cement rotary kiln into the kiln tail chimney.

[0013] In summary, the beneficial effects of the present utility model are as follows: The present utility model can achieve multiple effects. Firstly, it reduces carbon emissions. Algae absorb carbon dioxide through photosynthesis and convert it into their own biomass, thereby reducing the amount of carbon dioxide emitted into the atmosphere during industrial production processes, which helps to alleviate the greenhouse effect and climate change. Secondly, there are economic effects. During the growth process, algae not only fix a large amount of carbon dioxide but also accumulate oil and their own biomass, both of which have economic value. After the kiln tail waste gas generated during the production process of cement enterprises is dust-removed and harmful components are removed, it is heated to a suitable temperature through a heat exchanger and introduced into the algae cultivation device. Algae absorb carbon dioxide through photosynthesis and use sunlight to convert it into organic substances such as proteins, glucose, and starch, while releasing oxygen. Algae reproduce very quickly, and their quantity can increase four times every twenty hours under sufficient light conditions. Therefore, they need to absorb a large amount of carbon dioxide for photosynthesis. The speed and efficiency of algae absorbing carbon dioxide through photosynthesis are very high, which is used to reduce the carbon dioxide concentration in the atmosphere and improve environmental quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the kiln tail waste gas emission of a cement enterprise in the prior art.

[0015] Figure 2 is a schematic structural diagram of the present utility model.

[0016] Figure 3 is a schematic structural diagram of the cultivation container in the present utility model.

[0017] Wherein: 1. Ultra-fine filtration dust collector; 2. Harmful component removal tower; 3. Algae cultivation module; 4. Pipeline A; 5. Kiln tail chimney; 6. Pipeline B; 7. Air intake fan; 8. Heat exchanger; 9. Waste gas pipeline; 10. Pipeline CⅠ; 11. Pipeline CⅡ; 12. Pipeline D; 13. Temperature regulating air valve; 14. Temperature sensor; 15. Spraying device; 16. Air intake valve; 17. Cultivation container; 18. Connecting pipe; 19. Long pipe; 20. Short pipe; 21. Inclined pipe; 22. Branch pipe; 23. Kiln tail dust collector; 24. Kiln tail exhaust fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the specific embodiments of the present utility model with reference to the drawings. Embodiment 1

[0019] As Figure 2The carbon reduction device for the exhaust gas at the kiln tail of the cement enterprise shown in the figure includes an ultra-fine filtration dust collector 1, a harmful component removal tower 2, and an algae cultivation module 3. The ultra-fine filtration dust collector 1 is an existing technology. One end of it is an air inlet, and the other end is an air outlet. Gas enters the ultra-fine filtration dust collector 1 from the air inlet, and the ultra-fine filtration dust collector 1 filters out the fine dust particles in it. The gas from which the fine dust particles have been removed is then discharged from the ultra-fine filtration dust collector 1 through the air outlet. The air inlet of the ultra-fine filtration dust collector 1 is connected to the kiln tail chimney 5 by pipeline A4 in the use state. A air intake valve 16 is provided on the pipeline A4 to adjust the air intake volume from the kiln tail chimney 5. The air outlet of the ultra-fine filtration dust collector 1 is connected to the air inlet at the lower part of the harmful component removal tower 2 by pipeline B6. The gas discharged from the ultra-fine filtration dust collector 1 enters the harmful component removal tower 2 through the pipeline B6 and flows upward in the harmful component removal tower 2. The harmful components in the gas are removed during the upward flow. The air outlet at the upper part of the harmful component removal tower 2 is connected to the algae cultivation module 3 by pipeline C. A air intake fan 7 is provided on the pipeline C. The function of the air intake fan 7 is to extract gas, so that the kiln tail exhaust gas passes through the ultra-fine filtration dust collector 1 and the harmful component removal tower 2 in sequence from the kiln tail chimney 5 and enters the algae cultivation module 3. In this embodiment, the kiln tail exhaust gas in the kiln tail chimney 5 enters the ultra-fine filtration dust collector 1 for filtration, then the harmful components are removed by the harmful component removal tower 2, and then it is introduced into the algae cultivation module 3. The algae in the algae cultivation module 3 absorb the carbon dioxide in it, so as to achieve the effect of carbon reduction for the kiln tail exhaust gas of the cement rotary kiln. The algae in this embodiment are preferably Chlorella vulgaris. The kiln tail exhaust gas in the kiln tail chimney 5 in this embodiment is slightly positively pressurized. There are certain pressure losses in both the ultra-fine filtration dust collector 1 and the harmful component removal tower 2, and the algae cultivation module 3 requires a certain positive pressure during operation. Therefore, in order to maintain the flow of the kiln tail exhaust gas, sufficient power needs to be provided for the kiln tail exhaust gas. Therefore, the air intake fan 7 is set in this embodiment. The harmful components in this embodiment are mainly sulfur and nitrogen oxides.

[0020] Since the temperature of the gas is reduced to a level that cannot support the rapid growth of algae while the harmful components are removed in the harmful component removal tower 2, a heat exchanger 8 is provided in this embodiment. The heat exchanger 8 is arranged on the exhaust gas pipeline 9 connecting the cement rotary kiln and the kiln tail chimney 5. The heat exchanger 8 includes a heat exchanger housing and a spiral tube arranged inside the heat exchanger housing. The spiral tube is sleeved on the exhaust gas pipeline 9. The two ends of the spiral tube are respectively the air inlet and the air outlet of the heat exchanger 8. The air inlet and the air outlet of the heat exchanger 8 extend out from both ends of the heat exchanger housing respectively. The pipeline C in this embodiment includes pipeline CⅠ10 and pipeline CⅡ11. Among them, pipeline CⅠ10 connects the air outlet of the harmful component removal tower 2 and the air inlet of the heat exchanger 8, and pipeline CⅡ11 communicates with the air outlet of the heat exchanger 8 and the algae cultivation module 3. The air intake fan 7 is arranged on pipeline CⅡ11. The gas from which the harmful components are removed by the harmful component removal tower 2 exchanges heat with the exhaust gas discharged from the cement rotary kiln in the heat exchanger 8, and after the temperature is raised, it is then introduced into the algae cultivation module 3 to enter the algae cultivation module 3 at a temperature most favorable for the rapid growth of algae, so that the algae can grow rapidly and the economy of algae cultivation can be improved.

[0021] In this embodiment, a pipeline D12 and a temperature regulating air valve 13 are provided to regulate the temperature of the gas entering the algae cultivation module 3. The two ends of the pipeline D12 are respectively connected to pipeline CⅠ10 and pipeline CⅡ11 through tees, and the temperature regulating air valve 13 is arranged on the pipeline D12. Among them, the air intake fan 7 is located between the connection point of pipeline CⅡ11 and pipeline D12 and the algae cultivation module 3. By adjusting the temperature regulating air valve 13, the amounts of the gas entering pipeline CⅡ11 after heat exchange in the heat exchanger 8 and the gas directly entering pipeline CⅡ11 from pipeline D12 are adjusted, so as to adjust the temperature of the gas entering the algae cultivation module 3. In this embodiment, a temperature sensor 14 is preferably provided. The temperature sensor 14 is arranged on pipeline CⅡ11 and is located between the air intake fan 7 and the algae cultivation module 3, and is used to detect the temperature of the gas entering the algae cultivation module 3. In this embodiment, the temperature sensor 14 detects the temperature of the mixed gas. In this embodiment, the temperature of the gas detected by the temperature sensor is used to adjust the temperature regulating air valve 13, and the ratio of the gas entering pipeline CⅡ11 through pipeline D12 to the gas entering pipeline CⅡ11 through the heat exchanger 8 is adjusted, so that the mixed gas reaches a temperature that can enable the algae to grow rapidly.

[0022] In this embodiment, a spraying device 15 is provided at the top of the harmful component removal tower 2. The spraying device 15 includes a water inlet pipe and a plurality of nozzles. One end of the water inlet pipe extends outside the harmful component removal tower 2 and is connected to a container containing the removal agent. A water pump is installed on the water inlet pipe to supply the removal agent from the container containing the removal agent to the spraying device. The plurality of nozzles are all installed at one end of the water inlet pipe located inside the harmful component removal tower 2. The spraying device 15 sprays the removal agent into the harmful component removal tower 2. The removal agent flows downward, and comes into full contact with the gas flowing upward in the harmful component removal tower 2. The harmful components are absorbed by the removal agent and dissolved into the removal agent slurry. The removal agent is discharged from the bottom of the harmful component removal tower 2, thereby removing the harmful components in the gas and reducing the temperature of the gas. The temperature of the gas treated by the harmful component removal tower 2 is basically the same as the temperature of the removal agent, and this temperature is not suitable for the rapid growth of algae. Therefore, the heat exchanger 8 as described above is provided in this embodiment. A liquid discharge port is provided at the bottom of the harmful component removal tower 2 for periodically discharging the removal agent. The clean kiln tail waste gas is discharged from the upper part of the harmful component removal tower 2 and is used to be introduced into the algae cultivation module 3. The removal agent in this embodiment is a strong oxidant, and hydrogen peroxide is preferably used as the removal agent in this embodiment. There can be multiple harmful component removal towers 2 in this embodiment, and the multiple harmful component removal towers 2 are sequentially connected by pipelines, and the concentration of the removal agent sprayed into the harmful component removal tower 2 closer to the algae cultivation module 3 gradually decreases from the harmful component removal tower 2 closer to the ultra-fine filtration dust collector 1.

[0023] Such as Figure 3As shown in the figure, in this embodiment, the algae cultivation module 3 includes a plurality of cultivation containers 17 for containing algae nutrient water. The cultivation container 17 includes an arc-shaped connecting pipe 18, and a long pipe 19 and a short pipe 20 that are vertically arranged and parallel. The center line of the connecting pipe 18 in this embodiment is semi-circular. The bottom ends of the long pipe 19 and the short pipe 20 are respectively communicated with both ends of the connecting pipe 18. The height of the long pipe 19 is greater than that of the short pipe 20. An inclined pipe 21 is used to communicate with the long pipe 19 at the top end of the short pipe 20. One end of the inclined pipe 21 for communicating with the long pipe 19 is inclined upward. The height of the top of the inclined pipe 21 is lower than the height of the top of the long pipe 19. And the top opening of the long pipe 19 communicates with the atmosphere. The lower part of the short pipe 20 is communicated with the pipeline CⅡ11 through a branch pipe 22. The connecting pipe 18, the long pipe 19, the short pipe 20 and the branch pipe 22 in this embodiment are integrally formed and are all made of glass or plastic with good light transmittance (such as PET plastic). The liquid level height of the nutrient water in the cultivation container 17 of this embodiment is controlled within the inclined pipe 21. The treated kiln tail waste gas enters the short pipe 20 of the cultivation container through the branch pipe 22. The kiln tail waste gas moves upward under the action of buoyancy. While moving upward, it also drives the nutrient water containing algae in the short pipe 20 to move upward. At the same time, it will also dissolve the carbon dioxide in the kiln tail waste gas into the nutrient water, providing a material basis for the growth of algae. When the amount of the kiln tail waste gas is large enough, the nutrient water in the short pipe 20 can enter the long pipe 19 through the inclined pipe 21. The liquid level in the long pipe 19 is higher than that in the short pipe. The nutrient water in the long pipe 20 will flow to the side of the short pipe 20 under the action of gravity, forming a closed cycle. After the kiln tail waste gas enters the long pipe 19 from the short pipe 20, a part of the smaller bubbles enter the lower part of the long pipe 19 under the action of water flow and are further dissolved into the nutrient water during the movement. A part of the larger bubbles enter the upper part of the long pipe 19 under the action of buoyancy and finally are discharged into the atmosphere from the opening at the top of the long pipe 19.

[0024] In this embodiment, a dust collector 23 at the kiln tail is provided on the exhaust gas pipeline 9 connecting the cement rotary kiln and the chimney 5 at the kiln tail, which is used to remove large-particle dust in the exhaust gas at the kiln tail. A kiln tail exhaust fan 24 is provided on the exhaust gas pipeline 9 connecting the cement rotary kiln and the chimney 5 at the kiln tail. The kiln tail exhaust fan 24 is arranged between the dust collector 23 at the kiln tail and the chimney 5 at the kiln tail, and is used to discharge the exhaust gas at the kiln tail from the cement rotary kiln into the chimney 5 at the kiln tail. The dust collector 23 at the kiln tail and the ultra-fine filtration dust collector 1 in this embodiment both adopt bag dust collectors. The bag dust collector includes a metal shell and bags arranged in the metal shell for filtering dust. When the gas passes through the bags, the dust is blocked by the bags, separating the dust from the gas, and collecting the dust particles in the bags. The structure of the bag dust collector itself is prior art and will not be described in detail in this embodiment. The difference between the dust collector 23 at the kiln tail and the ultra-fine filtration dust collector 1 in this embodiment lies in the different weaving densities of the internal bags. The bag of the ultra-fine filtration dust collector 1 has a greater weaving density and can filter out finer dust particles. The dust collector 23 at the kiln tail in this embodiment can filter out dust particles with a particle size greater than 100 microns, while the ultra-fine filtration dust collector 1 is used to filter out dust particles with a particle size less than 100 microns.

[0025] The working principle of this embodiment is as follows: After the exhaust gas at the kiln tail generated in the production process of the cement enterprise is dust-removed and harmful components are removed, it is heated to an appropriate temperature by the heat exchanger 8 and introduced into the algae cultivation module 3. Chlorella absorbs carbon dioxide through photosynthesis and converts it into organic substances such as protein, glucose, and starch by using sunlight, while releasing oxygen. This embodiment makes full use of the characteristics that the reproduction speed of chlorella is very fast, and the quantity can increase by four times every twenty hours under sufficient light, and it can absorb a large amount of carbon dioxide for photosynthesis, solidifying the carbon dioxide in the exhaust gas at the kiln tail and converting it into chlorella with economic value. Embodiment 2

[0026] This embodiment is a method for reducing carbon in the exhaust gas at the kiln tail of a cement enterprise. The carbon reduction device for the exhaust gas at the kiln tail of the cement enterprise described in Embodiment 1 is adopted. The kiln tail exhaust fan 24 extracts the exhaust gas at the kiln tail in the cement rotary kiln. The exhaust gas at the kiln tail passes through the dust collector 23 at the kiln tail to absorb the particles therein, and then the exhaust gas at the kiln tail is discharged into the chimney 5 at the kiln tail. The air intake fan 7 is turned on to take air from the chimney 5 at the kiln tail, so that the exhaust gas at the kiln tail passes through the ultra-fine filtration dust collector 1 to filter and absorb the smaller particulate dust therein, and then the harmful components are removed by the harmful component remover, and finally it is introduced into the algae cultivation module 3, and the algae in the algae cultivation module 3 absorb the carbon dioxide therein.

[0027] When the temperature sensor 14 detects that the temperature of the gas entering the algae cultivation module 3 is relatively low in this embodiment, the temperature regulating air valve 13 is adjusted to reduce the gas entering the pipeline CⅡ11 through the pipeline D12, and increase the gas entering the pipeline CⅡ11 through the heat exchanger 8, so as to increase the temperature of the gas entering the algae cultivation module 3. When the temperature sensor 14 detects that the temperature of the gas entering the algae cultivation module 3 is relatively high, the temperature regulating air valve 13 is adjusted to increase the gas entering the pipeline CⅡ11 through the pipeline D12, and reduce the gas entering the pipeline CⅡ11 through the heat exchanger 8, so as to reduce the temperature of the gas entering the algae cultivation module 3, making the temperature of the gas entering the algae cultivation module 3 most suitable for the rapid growth of algae.

[0028] Parts not specifically described in the above description are all prior art or can be achieved through prior art. Moreover, the specific implementation cases described in this utility model are only the preferred implementation cases of this utility model, and are not used to limit the implementation scope of this utility model. That is, equivalent changes and modifications made to the content within the scope of the patent application of this utility model should all be regarded as the technical scope of this utility model.

Claims

1. Cement enterprise kiln tail exhaust gas carbon reduction device, characterized by: The invention comprises an ultrafine filtration dust collector (1), a harmful component removal tower (2) and an algae cultivation module (3); the air inlet of the ultrafine filtration dust collector (1) is connected to a kiln tail chimney (5) through a pipeline A (4) when in use; the air outlet of the ultrafine filtration dust collector (1) is connected to an air inlet at the bottom of the harmful component removal tower (2) through a pipeline B (6); the air outlet at the top of the harmful component removal tower (2) is connected to the algae cultivation module (3) through a pipeline C; an air intake fan (7) is arranged on the pipeline C; the kiln tail exhaust gas in the kiln tail chimney (5) enters the ultrafine filtration dust collector (1) for filtration, then passes through the harmful component removal tower (2) to remove harmful components, and then enters the algae cultivation module (3), where the algae in the algae cultivation module (3) absorb the carbon dioxide therein.

2. The device for reducing carbon content of waste gas from kiln tail of cement enterprise according to claim 1 is characterized by: The invention also comprises a heat exchanger (8), which is arranged on an exhaust gas pipeline (9) connecting the cement rotary kiln and the chimney (5) at the kiln tail. The pipeline C comprises a pipeline CⅠ (10) and a pipeline CⅡ (11), wherein the pipeline CⅠ (10) connects the air outlet of the harmful component removal tower (2) and the air inlet of the heat exchanger (8), and the pipeline CⅡ (11) communicates the air outlet of the heat exchanger (8) and the algae cultivation module (3). The air intake fan (7) is arranged on the pipeline CⅡ (11). The gas from which harmful components are removed by the harmful component removal tower (2) is subjected to heat exchange with the exhaust gas discharged from the cement rotary kiln through the heat exchanger (8) to increase the temperature and then is introduced into the algae cultivation module (3).

3. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 2 is characterized in that: The invention also comprises a pipeline D (12) and a temperature regulating air valve (13), wherein the two ends of the pipeline D (12) are respectively connected to the pipeline CⅠ (10) and the pipeline CⅡ (11), and the temperature regulating air valve (13) is arranged on the pipeline D (12), wherein the air intake fan (7) is located between the connection point of the pipeline CⅡ (11) and the pipeline D (12) and the algae cultivation module (3), and the temperature regulating air valve (13) is used to adjust the amount of gas entering the pipeline CⅡ (11) after heat exchange in the heat exchanger (8) and the amount of gas directly entering the pipeline CⅡ (11) from the pipeline D (12), thereby adjusting the temperature of the gas entering the algae cultivation module (3).

4. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 3 is characterized by: It also includes a temperature sensor (14), which is arranged on the pipeline CⅡ (11) and is located between the air intake fan (7) and the algae cultivation module (3) and is used to detect the temperature of the gas entering the algae cultivation module (3).

5. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 1 is characterized by: A spray device (15) is provided at the top of the harmful component removal tower (2). The spray device (15) is connected to a container containing a removal agent. The spray device (15) sprays the removal agent into the harmful component removal tower (2) to contact the gas flowing from bottom to top in the harmful component removal tower (2), thereby removing harmful components from the gas and reducing the temperature of the gas.

6. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 1 is characterized by: An air intake valve (16) is provided on the pipeline A (4) for adjusting the air intake volume from the chimney (5) at the kiln tail.

7. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 1 is characterized by: The algae cultivation module (3) comprises a plurality of cultivation containers (17) containing algae nutrient water. The cultivation containers (17) comprise an arc-shaped connecting pipe (18) and a long pipe (19) and a short pipe (20) which are arranged vertically and in parallel. The bottom ends of the long pipe (19) and the short pipe (20) are respectively connected to the two ends of the connecting pipe (18). An inclined pipe (21) is used at the top end of the short pipe (20) to be connected to the long pipe (19). One end of the inclined pipe (21) used to be connected to the long pipe (19) is inclined upward. The top of the long pipe (19) is open. The lower part of the short pipe (20) is connected to the pipeline CⅡ (11) through a branch pipe (22).

8. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 1 is characterized by: A kiln tail dust collector (23) is provided on the exhaust gas pipeline (9) connecting the cement rotary kiln and the kiln tail chimney (5) to remove large particles of dust in the kiln tail exhaust gas.

9. The device for reducing carbon dioxide in waste gas from kiln tail of cement enterprises according to claim 1, characterized in that: A kiln tail exhaust fan (24) is arranged on an exhaust gas pipeline (9) connecting the cement rotary kiln and the kiln tail chimney (5). The kiln tail exhaust fan (24) is arranged between the kiln tail dust collector (23) and the kiln tail chimney (5) and is used to discharge kiln tail exhaust gas from the cement rotary kiln into the kiln tail chimney (5).

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