Environment-friendly dust removal system and fertilizer production system

Abstract

The utility model discloses an environment-friendly dust removal system and a fertilizer production system, and relates to the field of dust-containing tail gas treatment facilities for fertilizer production, and the environment-friendly dust removal system comprises a first-stage sedimentation dust removal mechanism, a second-stage sedimentation dust removal mechanism, a third-stage sedimentation dust removal mechanism and a fourth-stage sedimentation dust removal mechanism, the secondary settling dust removal mechanism comprises a first drying settling chamber II, a second drying settling chamber II and a cooling settling chamber II, the first drying settling chamber II is communicated with the first drying settling chamber I, the second drying settling chamber II is communicated with the second drying settling chamber I, and the cooling settling chamber II is communicated with the cooling settling chamber I; the washing and dust collecting mechanism comprises a first drying spray tower, a second drying spray tower and a cooling spray tower, the first drying spray tower is communicated with the second first drying settling chamber, the second drying spray tower is communicated with the second second drying settling chamber, and the cooling spray tower is communicated with the second cooling settling chamber. And the first-stage sedimentation dust removal mechanism, the second-stage sedimentation dust removal mechanism and the washing dust collection mechanism are matched for use, so that the dust removal effect is improved, and the content of dust particles in finally discharged tail gas is reduced, so that the environmental protection requirement is met.

Description

Technical Field

[0001] The present application relates to the field of dust-containing tail gas treatment facilities for fertilizer production, and particularly relates to an environmental protection dust removal system and a fertilizer production system. Background Art

[0002] In fertilizer production, after granulation, primary drying, secondary drying, and cooling treatments are usually required. A large amount of tail gas containing dust particles is generated during primary drying, secondary drying, and cooling treatments, and needs to be treated before being discharged.

[0003] For some fertilizer production lines, especially those built earlier, sedimentation chambers are mostly used as tail gas dust removal facilities. After the tail gas enters the sedimentation chamber, its speed decreases, and the dust particles carried in the tail gas naturally settle to the bottom of the sedimentation chamber under the action of gravity. The tail gas after dust removal treatment is then discharged through a chimney. Only using a sedimentation chamber for dust removal, the content of dust particles entrained in the tail gas discharged from the chimney is likely to exceed the standard, making it difficult to meet environmental protection requirements. Utility Model Content

[0004] The present application provides an environmental protection dust removal system and a fertilizer production system to improve the problem that the content of dust particles in the tail gas after sedimentation dust removal treatment is likely to exceed the standard and it is difficult to meet environmental protection requirements.

[0005] According to a first aspect, in one embodiment, an environmental protection dust removal system is provided, including:

[0006] A primary sedimentation dust removal mechanism, the primary sedimentation dust removal mechanism includes a primary drying sedimentation chamber, a secondary drying sedimentation chamber, and a cooling sedimentation chamber;

[0007] A secondary sedimentation dust removal mechanism, the secondary sedimentation dust removal mechanism includes a primary drying sedimentation chamber II, a secondary drying sedimentation chamber II, and a cooling sedimentation chamber II. The primary drying sedimentation chamber II is communicated with the primary drying sedimentation chamber I, the secondary drying sedimentation chamber II is communicated with the secondary drying sedimentation chamber I, and the cooling sedimentation chamber II is communicated with the cooling sedimentation chamber I;

[0008] A washing dust collection mechanism, the washing dust collection mechanism includes a primary drying spray tower, a secondary drying spray tower, and a cooling spray tower. The air inlet of the primary drying spray tower is communicated with the primary drying sedimentation chamber II, the air inlet of the secondary drying spray tower is communicated with the secondary drying sedimentation chamber II, and the air inlet of the cooling spray tower is communicated with the cooling sedimentation chamber II.

[0009] In one embodiment, it further includes a foundation pit, and the washing dust collection mechanism is arranged in the foundation pit.

[0010] In one embodiment, the washing and dust collection mechanism further includes a sedimentation tank, and the sedimentation tank is provided with a water supply pipeline. The sedimentation tank can supply water to the first drying spray tower, the second drying spray tower, and the cooling spray tower through the water supply pipeline, and the sedimentation tank is communicated with the water outlets of the first drying spray tower, the second drying spray tower, and the cooling spray tower.

[0011] In one embodiment, one or more partition walls are arranged in the sedimentation tank, and the multiple partition walls are arranged in parallel at intervals. The partition walls divide the sedimentation tank into at least two sedimentation areas, and communication ports are arranged on each partition wall. Each sedimentation area is sequentially communicated through the communication ports. The two sedimentation areas on the opposite sides of the sedimentation tank are respectively used as the inlet sedimentation area and the outlet sedimentation area. The water outlets of the first drying spray tower, the second drying spray tower, and the cooling spray tower drain water into the inlet sedimentation area, and a water supply pump is arranged in the outlet sedimentation area. The water supply pump supplies the water in the outlet sedimentation area to the first drying spray tower, the second drying spray tower, and the cooling spray tower through the water supply pipeline.

[0012] In one embodiment, three groups of water supply pumps are arranged, and the three groups of water supply pumps are respectively used to supply water to the first drying spray tower, the second drying spray tower, and the cooling spray tower.

[0013] In one embodiment, the sedimentation tank is provided with a water extraction pump, and the water extraction pump is used to pump the water in the sedimentation tank to the sewage treatment system.

[0014] In one embodiment, one or more of the first drying spray tower, the second drying spray tower, and the cooling spray tower are arranged as multi-layer spray towers.

[0015] In one embodiment, a first exhaust fan is arranged between the first drying sedimentation chamber and the second drying sedimentation chamber;

[0016] And / or, a second exhaust fan is arranged between the first second-drying sedimentation chamber and the second second-drying sedimentation chamber;

[0017] And / or, a third exhaust fan is arranged between the first cooling sedimentation chamber and the second cooling sedimentation chamber.

[0018] In one embodiment, any two of the first drying sedimentation chamber, the first second-drying sedimentation chamber, and the first cooling sedimentation chamber are stacked one above the other;

[0019] And / or, any two of the second drying sedimentation chamber, the second second-drying sedimentation chamber, and the second cooling sedimentation chamber are stacked one above the other.

[0020] According to the second aspect, in one embodiment, a fertilizer production system is provided, including granulation equipment and an environmental protection dust removal system, and the environmental protection dust removal system is the environmental protection dust removal system described in any of the above embodiments.

[0021] According to the environmental protection dust removal system of the above embodiments, the primary sedimentation dust removal mechanism and the secondary sedimentation dust removal mechanism are used to first perform sedimentation dust removal on the first drying tail gas, the second drying tail gas, and the drying tail gas. The primary sedimentation dust removal mechanism mainly removes large-particle-size dust particles in various tail gases, and the secondary sedimentation dust removal mechanism mainly removes small-particle-size dust particles in various tail gases. Then, washing is carried out through the washing dust collection mechanism to further remove various dust particles that cannot be removed by sedimentation. The combined use of the primary sedimentation dust removal mechanism, the secondary sedimentation dust removal mechanism, and the washing dust collection mechanism improves the dust removal effect, helps to reduce the content of dust particles in the finally discharged tail gas, so as to meet the environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an environmental protection dust removal system according to an embodiment;

[0023] Figure 2 It is a schematic diagram of the structure of a part of the washing dust collection mechanism in an embodiment;

[0024] Figure 3 It is a schematic diagram of the structure of a part of the sedimentation tank in an embodiment.

[0025] In the figure, 100 is the primary sedimentation dust removal mechanism; 110 is the first drying sedimentation chamber; 111 is the first suction fan; 120 is the second drying sedimentation chamber; 121 is the second suction fan; 130 is the cooling sedimentation chamber; 131 is the third suction fan;

[0026] 200 is the secondary sedimentation dust removal mechanism; 210 is the second drying sedimentation chamber; 220 is the second drying sedimentation chamber; 230 is the cooling sedimentation chamber; 240 is the gas transmission pipeline;

[0027] 300 is the washing dust collection mechanism; 310 is the first drying spray tower; 320 is the second drying spray tower; 330 is the cooling spray tower; 340 is the sedimentation tank; 341 is the water supply pipe; 3411 is the water supply pump; 342 is the water outlet pipe; 343 is the partition wall; 3431 is the communication port; 3432 is the inlet sedimentation area; 3433 is the outlet sedimentation area; 344 is the water pump; 3441 is the mounting seat;

[0028] 400 is the foundation pit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present application will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the field.

[0030] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner for those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated otherwise that a certain sequence must be followed.

[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0032] In fertilizer production, after granulation, it is usually necessary to perform primary drying, secondary drying, and cooling treatments. A large amount of tail gas containing dust particles is generated during primary drying, secondary drying, and cooling treatments, and it needs to be treated before being discharged. The dust removal effect of some early-built dust removal facilities is poor, resulting in the excessive content of dust particles in the discharged tail gas, making it difficult to meet the environmental protection requirements.

[0033] In the embodiment of the present application, through the primary sedimentation dust removal mechanism 100 and the secondary sedimentation dust removal mechanism 200, sedimentation dust removal is performed on the primary drying tail gas, secondary drying tail gas, and drying tail gas. The primary sedimentation dust removal mechanism 100 can remove large-sized dust particles in various tail gases, while the secondary sedimentation dust removal mechanism 200 can remove small-sized dust particles. Subsequently, the washing dust collection mechanism 300 is used for further washing treatment to effectively remove various dust particles that have not settled. Through the synergistic effect of the primary sedimentation dust removal mechanism 100, the secondary sedimentation dust removal mechanism 200, and the washing dust collection mechanism 300, it helps to improve the dust removal effect, meet the environmental protection requirements, and reduce the content of dust particles in the finally discharged tail gas.

[0034] In one embodiment, an environmentally friendly dust removal system is disclosed. Please refer to Figures 1 to 3 , the environmentally friendly dust removal system includes a primary sedimentation dust removal mechanism 100, a secondary sedimentation dust removal mechanism 200, and a washing and dust collection mechanism 300.

[0035] Please refer to Figure 1 , the primary sedimentation dust removal mechanism 100 includes a first drying sedimentation chamber 110, a second drying sedimentation chamber 120, and a cooling sedimentation chamber 130. The tail gas from the first drying is collected and introduced into the first drying sedimentation chamber 110, the tail gas from the second drying is collected and introduced into the second drying sedimentation chamber 120, and the drying tail gas is collected and introduced into the cooling sedimentation chamber 130. The first drying sedimentation chamber 110 performs primary sedimentation dust removal on the tail gas from the first drying, the second drying sedimentation chamber 120 performs primary sedimentation dust removal on the tail gas from the second drying, and the cooling sedimentation chamber 130 performs primary sedimentation dust removal on the drying tail gas.

[0036] Please refer to Figure 1 , the secondary sedimentation dust removal mechanism 200 includes a first drying sedimentation chamber 210, a second drying sedimentation chamber 220, and a cooling sedimentation chamber 230. Among them, the first drying sedimentation chamber 210 is connected to the first drying sedimentation chamber 110, the second drying sedimentation chamber 220 is connected to the second drying sedimentation chamber 120, and the cooling sedimentation chamber 230 is connected to the cooling sedimentation chamber 130. The first drying sedimentation chamber 210 performs secondary sedimentation dust removal on the tail gas from the first drying that has been treated by the first drying sedimentation chamber 110, the second drying sedimentation chamber 220 performs secondary sedimentation dust removal on the tail gas from the second drying that has been treated by the second drying sedimentation chamber 120, and the cooling sedimentation chamber 230 performs secondary sedimentation dust removal on the drying tail gas that has been treated by the cooling sedimentation chamber 130.

[0037] Through the cooperation of the primary sedimentation dust removal mechanism 100 and the secondary sedimentation dust removal mechanism 200 for two-stage sedimentation dust removal treatment, it is possible to remove a part of the dust particles in various tail gases (tail gas from the first drying, tail gas from the second drying, and drying tail gas).

[0038] Please refer to Figure 1 , the washing and dust collection mechanism 300 includes a first drying spray tower 310, a second drying spray tower 320, and a cooling spray tower 330. The air inlets of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 are correspondingly connected to the first drying sedimentation chamber 210, the second drying sedimentation chamber 220, and the cooling sedimentation chamber 230 through a gas transmission pipeline 240. Specifically, the air inlet of the first drying spray tower 310 is connected to the first drying sedimentation chamber 210 through the gas transmission pipeline 240, the air inlet of the second drying spray tower 320 is connected to the second drying sedimentation chamber 220 through the gas transmission pipeline 240, and the air inlet of the cooling spray tower 330 is connected to the cooling sedimentation chamber 230 through the gas transmission pipeline 240.

[0039] The first drying spray tower 310 sprays and washes the first drying tail gas after two-stage sedimentation and dust removal treatment. The second drying spray tower 320 sprays and washes the second drying tail gas after two-stage sedimentation and dust removal treatment. The cooling spray tower 330 sprays and washes the drying tail gas after two-stage sedimentation and dust removal treatment. Through spray washing, various dust particles that could not be removed during the two-stage sedimentation and dust removal treatment in various tail gases are further removed, so that the particulate matter content in the finally discharged first drying tail gas, second drying tail gas, and drying tail gas is further reduced, which helps to meet the environmental protection requirements.

[0040] In order to save plant space and improve the land utilization rate of the plant, in one embodiment, any two of the first drying sedimentation chamber 110, the second drying sedimentation chamber 120, and the cooling sedimentation chamber 130 can be stacked vertically; in another embodiment, any two of the first drying sedimentation chamber 210, the second drying sedimentation chamber 220, and the cooling sedimentation chamber 230 can also be stacked vertically. In this way, the occupation rate of the plant's planar space can be reduced, and the height after stacking is still convenient for cleaning the sedimented dust particles.

[0041] Exemplarily, please refer to Figure 1 , the first drying sedimentation chamber 110 is stacked above the cooling sedimentation chamber 130, and the first drying sedimentation chamber 210 is stacked above the cooling sedimentation chamber 230. In other examples, other stacking methods can also be adopted, which can be specifically combined with the layout of the positions of the first drying, second drying, and cooling treatment processes in the plant building of the factory area, and the adjacent sedimentation chambers are preferably stacked.

[0042] In order to improve the tail gas circulation efficiency between the first-stage sedimentation and dust removal mechanism 100 and the second-stage sedimentation and dust removal mechanism 200, in one embodiment, please refer to Figure 1 , a first exhaust fan 111 is provided between the first drying sedimentation chamber 110 and the first drying sedimentation chamber 210. The air inlet of the first exhaust fan 111 is communicated with the air outlet of the first drying sedimentation chamber 110, and the air outlet of the first exhaust fan 111 is communicated with the air inlet of the first drying sedimentation chamber 210, so as to pump the gas in the first drying sedimentation chamber 110 to the first drying sedimentation chamber 210.

[0043] In one embodiment, please refer to Figure 1 , a second exhaust fan 121 is provided between the second drying sedimentation chamber 120 and the second drying sedimentation chamber 220. The air inlet of the second exhaust fan 121 is communicated with the air outlet of the second drying sedimentation chamber 120, and the air outlet of the second exhaust fan 121 is communicated with the air inlet of the second drying sedimentation chamber 220, so as to pump the gas in the second drying sedimentation chamber 120 to the second drying sedimentation chamber 220.

[0044] In one embodiment, please refer to Figure 1, a third exhaust fan 131 is provided between the first cooling and sedimentation chamber 130 and the second cooling and sedimentation chamber 230. The air inlet of the third exhaust fan 131 is communicated with the air outlet of the first cooling and sedimentation chamber 130, and the air outlet of the third exhaust fan 131 is communicated with the air inlet of the second cooling and sedimentation chamber 230, so as to pump the gas in the first cooling and sedimentation chamber 130 to the second cooling and sedimentation chamber 230.

[0045] In different embodiments, only one of the above-mentioned first exhaust fan 111, second exhaust fan 121 and third exhaust fan 131 can be provided as needed, or two of them can be provided, or all of them can be provided.

[0046] For the washing and dust collection mechanism 300, since there may be cables, pipelines, especially high-altitude facilities such as high-voltage lines, above the space of some factory areas, and the facilities of the washing and dust collection mechanism 300 are relatively high, the exhausted tail gas may cause damage to high-altitude facilities such as high-voltage lines. To improve this potential safety hazard, referring to Figure 1 and Figure 2 , the environmental protection dust removal system further includes a foundation pit 400. The washing and dust collection mechanism 300 is arranged in the foundation pit 400. The depth of the foundation pit 400 can be comprehensively set according to the distance between the high-altitude facilities and the ground and the height of the facilities of the washing and dust collection mechanism 300 used, so as to ensure that a safe distance is reserved between the exhaust port of the washing and dust collection mechanism 300 and the high-altitude facilities.

[0047] Exemplarily, if there is a high-voltage line erected 25 meters above the area where the washing and dust collection mechanism 300 is arranged, and the total installation height of the washing and dust collection mechanism 300 is 12 meters, that is, when the washing and dust collection mechanism 300 is arranged on the ground, the distance between the air outlet of the washing and dust collection mechanism 300 and the high-voltage line is only 13 meters, then the overall civil engineering foundation of the washing and dust collection mechanism 300 can be lowered by 4 meters to increase the distance between the air outlet of the washing and dust collection mechanism 300 and the high-voltage line and reduce the potential safety hazard.

[0048] In some embodiments, since the washing and dust collection mechanism 300 is arranged in the foundation pit 400 and there is a height difference from the secondary sedimentation and dust removal mechanism 200, therefore, support frames can be provided for each gas transmission pipeline 240 connecting the washing and dust collection mechanism 300 and the secondary sedimentation and dust removal mechanism 200.

[0049] In one embodiment, please refer to Figure 1 and Figure 2 , the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330 are all set as multi-layer spray towers to achieve multi-layer spray washing and improve the dust removal effect. In different embodiments, any one or two of the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330 can also be set as multi-layer spray towers as needed.

[0050] In one embodiment, please refer toFigure 1 and Figure 2 The washing and dust collection mechanism 300 further includes a sedimentation tank 340. The sedimentation tank 340 is provided with a water supply pipe 341. The sedimentation tank 340 can supply water to the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 through the water supply pipe 341, and the sedimentation tank 340 is communicated with the water outlets of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330. The sedimentation tank 340 can make the spray water recycled, which helps to reduce water resource consumption.

[0051] Exemplarily, the sedimentation tank 340 is arranged in the foundation pit 400 and is located on one side of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330. Water outlet pipes 342 are connected to the water outlets of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 respectively. The water outlet ends of the water outlet pipes 342 extend into the sedimentation tank 340, so that the washing water after spray washing of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 can be discharged into the sedimentation tank 340 for sedimentation, so as to reuse the washing water.

[0052] Please refer to Figure 2 The water supply pipe 341 includes three groups of water supply pipes 341. The three groups of water supply pipes 341 are respectively connected to the water inlets of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330, so that the water sediment-treated in the sedimentation tank 340 can be conveyed to the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 through the water supply pipe 341 for recycling. In some examples, the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 are each provided with two water inlets. Then the three groups of water supply pipes 341 are correspondingly arranged as double-outlet pipelines, and the two water inlets of the first drying spray tower 310, the second drying spray tower 320, and the cooling spray tower 330 are respectively connected to the two water inlets of a water supply pipe 341.

[0053] In a further embodiment, please refer to Figure 2 and Figure 3, a partition wall 343 is provided in the sedimentation tank 340. In different embodiments, the partition wall 343 can be one or more. The multiple partition walls 343 are arranged in parallel at intervals, so that the sedimentation tank 340 can be divided into at least two sedimentation areas through the partition wall 343. A communication port 3431 is provided on each partition wall 343, and the sedimentation areas are sequentially communicated through the communication port 3431. The two sedimentation areas located on the opposite sides of the sedimentation tank 340 are respectively used as the influent sedimentation area 3432 and the effluent sedimentation area 3433. The water outlets of a first drying spray tower 310, a second drying spray tower 320 and a cooling spray tower 330 drain water into the influent sedimentation area 3432 through a water outlet pipe 342; a water supply pump 3411 is provided in the effluent sedimentation area 3433, and the water supply pump 3411 supplies the water in the effluent sedimentation area 3433 to the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330 through a water supply pipe 341. The setting of multiple sedimentation areas enables the solid impurities in the spray water to be gradually removed in stages, thereby improving the sedimentation efficiency and the effluent quality as a whole.

[0054] Exemplarily, two partition walls 343 are provided in the sedimentation tank 340. The two partition walls 343 divide the sedimentation tank 340 into three sedimentation areas, enabling the sedimentation tank 340 to perform three-stage sedimentation, which helps to ensure the cleanliness of the spray water re-supplied to the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330.

[0055] In one embodiment, please refer to Figure 2 and Figure 3 , three groups of water supply pumps 3411 are provided. The three groups of water supply pumps 3411 are respectively used to supply water to the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330. Exemplarily, the three groups of water supply pumps 3411 are arranged side by side in the effluent sedimentation area 3433, and the water outlets of the three groups of water supply pumps 3411 are respectively connected to a group of water supply pipes 341, so as to selectively supply water according to the actual needs of the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330, which helps to reduce the energy consumption when the first drying spray tower 310, the second drying spray tower 320 and the cooling spray tower 330 are partially operating.

[0056] In one embodiment, please refer to Figure 2 and Figure 3, a water extraction pump 344 is provided in the sedimentation tank 340. The water extraction pump 344 is used to pump the water in the sedimentation tank 340 to the sewage treatment system, so as to replace the circulating water in the sedimentation tank 340 according to the water quality situation, and clean the sediment at the bottom of the sedimentation tank 340. In addition, it can also pump away the excess water when the liquid level in the sedimentation tank 340 is too high due to rainfall or other factors. Exemplarily, a mounting seat 3441 is provided on the partition wall 343, the water extraction pump 344 is installed on the mounting seat 3441, the water inlet of the water extraction pump 344 is submerged in the sedimentation and clarification area, and the water outlet of the water extraction pump 344 is used to connect to a drain pipe leading to the sewage treatment system.

[0057] In an embodiment of a fertilizer production system, it includes a granulation device and an environmental protection dust removal system, and the environmental protection dust removal system is the environmental protection dust removal system of any one of the above embodiments.

[0058] The above uses specific examples to elaborate on the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the technical field to which the present application belongs, according to the idea of the present application, several simple deductions, deformations or substitutions can also be made.

Claims

1. An environmentally friendly dust removal system, characterized in that: include: A primary settling dust removal mechanism, the primary settling dust removal mechanism comprising a first drying settling chamber, a second drying settling chamber and a cooling settling chamber; A two-stage sedimentation and dust removal mechanism, the two-stage sedimentation and dust removal mechanism comprises a first drying and sedimentation chamber 2, a second drying and sedimentation chamber 2 and a second cooling and sedimentation chamber 2, the first drying and sedimentation chamber 2 is connected to the first drying and sedimentation chamber 1, the second drying and sedimentation chamber 2 is connected to the second drying and sedimentation chamber 1, and the second cooling and sedimentation chamber is connected to the first cooling and sedimentation chamber; The washing and dust collecting mechanism comprises a drying spray tower, a second drying spray tower and a cooling spray tower, the air inlet of the drying spray tower is connected to the first drying and settling chamber, the air inlet of the second drying spray tower is connected to the second drying and settling chamber, and the air inlet of the cooling spray tower is connected to the second cooling and settling chamber.

2. The environmentally friendly dust removal system according to claim 1, characterized in that: It also includes a foundation pit, in which the washing and dust collecting mechanism is arranged.

3. The environmentally friendly dust removal system according to claim 2, characterized in that: The washing and dust collecting mechanism also includes a sedimentation tank, which is provided with a water supply pipeline. The sedimentation tank can supply water to the first drying spray tower, the second drying spray tower and the cooling spray tower through the water supply pipeline, and the sedimentation tank is connected to the water outlets of the first drying spray tower, the second drying spray tower and the cooling spray tower.

4. The environmentally friendly dust removal system according to claim 3, characterized in that: One or more partition walls are arranged in the sedimentation tank, and the multiple partition walls are arranged in parallel and at intervals. The partition walls divide the sedimentation tank into at least two settling areas. The partition walls are provided with connecting ports, and the settling areas are connected in sequence through the connecting ports. The two settling areas on the opposite sides of the sedimentation tank serve as water inlet settling areas and water outlet settling areas respectively. The water outlets of the first drying spray tower, the second drying spray tower and the cooling spray tower drain water to the water inlet settling area. The water outlet settling area is provided with a water supply pump, and the water supply pump supplies water in the water outlet settling area to the first drying spray tower, the second drying spray tower and the cooling spray tower through the water supply pipeline.

5. The environmentally friendly dust removal system according to claim 4, characterized in that: The water supply pumps are provided in three groups, and the three groups of water supply pumps are used to supply water to the first drying spray tower, the second drying spray tower and the cooling spray tower respectively.

6. The environmentally friendly dust removal system according to claim 3, characterized in that: The sedimentation tank is provided with a water pump, and the water pump is used to pump the water in the sedimentation tank to the sewage treatment system.

7. The environmentally friendly dust removal system according to any one of claims 1 to 6, characterized in that: One or more of the first drying spray tower, the second drying spray tower and the cooling spray tower are configured as multi-layer spray towers.

8. The environmentally friendly dust removal system according to any one of claims 1 to 6, characterized in that: A first exhaust fan is provided between the first drying and settling chamber and the second drying and settling chamber; And / or, a second exhaust fan is provided between the second drying and settling chamber 1 and the second drying and settling chamber 2; And / or, a third exhaust fan is provided between the cooling and settling chamber 1 and the cooling and settling chamber 2.

9. The environmentally friendly dust removal system according to any one of claims 1 to 6, characterized in that: Any two of the one-baking and settling chamber, the two-baking and settling chamber, and the one-cooling and settling chamber are stacked up and down; And / or, any two of the first drying and settling chamber, the second drying and settling chamber, and the second cooling and settling chamber are stacked up and down.

10. A fertilizer production system, characterized in that: It comprises a granulation device and an environmentally friendly dust removal system, and the environmentally friendly dust removal system is the environmentally friendly dust removal system according to any one of claims 1-9.

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