Ammonia desulfurization multistage circulating liquid density module control device

Abstract

The utility model discloses an ammonia desulphurization multistage circulating liquid density module control device, and belongs to the field of environmental protection equipment. The device comprises a multi-stage circulating liquid module, a circulating tower module, a circulating liquid conveying mechanism, a density control module and a solid fertilizer module, a cooling module, a reaction module, a washing module and a demisting module are arranged in the circulating tower module; each module is provided with one or more flue gas channels, one or more spraying layers and one or more tower module accessories; the exterior of the circulating tower module is connected with each circulating liquid module and the solid fertilizer module through a plurality of sets of circulating liquid conveying mechanisms; each circulating liquid module is provided with a circulating liquid conveying mechanism and a density control module, and the density control liquid is from a solution lower than the circulating liquid module, so that the density of each stage of circulating liquid module is gradually reduced in sequence, and normal operation of the desulfurization system is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection equipment, and in particular relates to a multi-stage circulating liquid density module control device for ammonia desulfurization. Background Art

[0002] In recent years, with the increasing requirements for flue gas treatment in the country, the original ultra-low emission technology of wet flue gas desulfurization can no longer be applied to the deepening of deep and precise treatment, especially in the coordinated treatment of multiple pollutants. The density of the circulating liquid in the desulfurization operation is too high or the density gradient cannot be established, resulting in fluctuations in the flue gas emission indicators of the entire desulfurization system, abnormal operating parameters, and crystallization of by-products.

[0003] In the operation of the desulfurization system, for each level of circulating liquid, forming a density gradient and reducing the density can improve the performance of the circulating liquid, increase the specific surface area of ​​the circulating liquid and the flue gas, create a good flue gas absorption environment, and improve the desulfurization efficiency and oxidation efficiency. For flue gas emission indicators, by forming a density gradient and reducing the density, the droplets carried by the flue gas are reduced, and the concentration of particulate matter and ammonia escape in the flue gas emission is reduced. For fertilizer crystallization, the optimized control of density and the good flow of slurry promote the crystallization of by-product ammonium sulfate. The multi-stage circulating liquid density module control device for ammonia desulfurization increases the social and economic benefits of the enterprise while achieving long-term stability of the desulfurization system. Summary of the invention

[0004] In order to overcome the above problems, the utility model provides a combined density gradient functional module device in ammonia desulfurization, which maximizes the utilization efficiency of the desulfurization equipment during operation, while solving the operation problems of the desulfurization equipment in the prior art, realizing the normal operation of the desulfurization system and the coordinated control of multiple pollutants, reducing the system operating costs, and realizing the safe, stable and energy-saving operation of the desulfurization system.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A multi-stage circulating liquid density module control device for ammonia desulfurization comprises a multi-stage circulating liquid module, a circulating tower module, several sets of circulating liquid conveying mechanisms, several sets of density control modules and a solid fertilizer module. A cooling module, a reaction module, a washing module and a demisting module are arranged inside the circulating tower module along the direction of flue gas from bottom to top. The outside of the circulating tower module is connected to the multi-stage circulating liquid module and the solid fertilizer module through several sets of circulating liquid conveying mechanisms.

[0007] A further improvement of the technical solution of the utility model is that each of the cooling module, the reaction module, the washing module and the demisting module is provided with one or more smoke channels, one or more spray layers and one or more tower module accessories.

[0008] A further improvement of the technical solution of the utility model is that the multi-stage circulating liquid module includes a set of circulating liquid modules arranged at the lower part of the circulating tower module and several sets of circulating liquid modules arranged outside the circulating tower module, and 2 or more sets of external circulating liquid modules are arranged, and each set of circulating liquid modules is equipped with a density control module that can display the liquid density.

[0009] A further improvement of the technical solution of the utility model is that: the reaction module includes one or more stages of reaction modules, the washing module includes one or more stages of washing modules, each stage of reaction modules or each stage of washing modules is correspondingly connected to a set of circulating liquid modules and a set of circulating liquid conveying mechanisms, each stage of reaction modules includes one or more layers of spray layers and tower module accessories, each stage of washing modules includes one layer of spray layers and tower module accessories, and each stage of reaction modules or each stage of washing modules are separated by flue gas channels.

[0010] A further improvement of the technical solution of the utility model is that: the reaction module includes a two-stage reaction module, the washing module includes a two-stage washing module, the cooling module is connected to the primary circulating liquid module, the primary reaction module of the reaction module is connected to the secondary circulating liquid module, the secondary reaction module of the reaction module is connected to the tertiary circulating liquid module, and the primary and secondary washing modules of the washing module are respectively connected to the fourth circulating liquid module and the fifth circulating liquid module; the spray liquid and the return liquid of each stage of the reaction module are connected to the secondary circulating liquid module and the third circulating liquid module through the corresponding circulating liquid conveying mechanism, and the spray liquid and the return liquid of each stage of the washing module are connected to the fourth circulating liquid module and the fifth circulating liquid module through the corresponding circulating liquid conveying mechanism, and the density of the liquid in the multi-stage circulating liquid module decreases from the first stage to the fifth stage.

[0011] A further improvement of the technical solution of the utility model is that the primary circulating liquid module is arranged below the inside of the circulating tower module, and the secondary circulating liquid module, the tertiary circulating liquid module, the quaternary circulating liquid module and the quintuple circulating liquid module are arranged outside the circulating tower module.

[0012] A further improvement of the technical solution of the utility model is that the secondary circulating liquid module is arranged below the inside of the circulating tower module, and the primary circulating liquid module, the tertiary circulating liquid module, the quaternary circulating liquid module and the quintuple circulating liquid module are arranged outside the circulating tower module.

[0013] A further improvement of the technical solution of the utility model lies in that: the multi-stage circulating liquid module is correspondingly interlocked and mutually controlled with each circulating liquid conveying mechanism and density control module, the density control module of the circulating liquid module with higher density is interlocked with the circulating liquid conveying mechanism of the circulating liquid module with lower density, the liquid of the circulating liquid module with higher density comes from the circulating liquid module with lower density, and the secondary circulating liquid module is connected to the primary circulating liquid module through an overflow pipe.

[0014] A further improvement of the technical solution of the utility model is that: the cooling module is provided with two spray layers, one of which is connected to the primary circulating liquid module through a circulating liquid conveying mechanism; the other is connected to the secondary circulating liquid module through a circulating liquid conveying mechanism connected to the reaction module, and the density control module of the secondary circulating liquid module interlocks with the circulating liquid conveying mechanism connected to it to control the flushing and cooling module and the density of the primary circulating liquid module, and the water spraying directions of the two spray layers are opposite.

[0015] The further improvement of the technical solution of the utility model is that: a smoke inlet is arranged on the cooling module, a smoke exhaust port is arranged above the demisting module, and the primary circulating liquid module is connected to the solid fertilizer module through a circulating liquid conveying mechanism.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0017] The present application sets various functional areas inside the circulating tower module, including a flue gas cooling module, a reaction module, a washing module, and a demisting module. Each module is separated by a flue gas channel so that it can independently control the function of each functional area and divert the circulating liquid. Among them, the flue gas cooling module has two spray layers in opposite directions. The downward spray layer is connected to the primary circulating liquid module through the circulating liquid conveying mechanism of the cooling module to achieve the flue gas cooling effect; the upward spray layer is connected to the secondary circulating liquid module through the circulating liquid conveying mechanism of the reaction module, and the circulating liquid conveying mechanism of the secondary circulating liquid module is interlocked with the flushing cooling module through the density control module of the secondary circulating liquid module to control the density of the primary circulating liquid module. The reaction module can include a primary (or secondary) reaction area, and each reaction area can include one (or more) spray layers and tower module accessories. Each reaction area is separated by a flue gas channel; each spray layer is connected to the circulating liquid module through the circulating liquid conveying mechanism. The primary and secondary reaction areas correspond to the secondary and tertiary circulating liquid modules respectively, so as to independently process flue gas pollutants step by step and form circulating liquids of different densities at the secondary level. The washing module includes a primary (or secondary) washing module, each of which may include a spray layer and a tower module accessory. Each washing module is separated by a flue gas channel, and each spray layer is connected to the circulating liquid module through a circulating liquid conveying mechanism. The primary and secondary washing modules correspond to the fourth and fifth circulating liquid modules respectively; in addition, a demisting module is provided on the upper part of the washing module, and the intercepting water and flushing water of the demisting module flow into the fifth circulating liquid module together with the liquid of the spray layer of the secondary washing area, so as to independently wash the flue gas droplets step by step and form a second level of washing liquid with different densities. A secondary circulating liquid module, a tertiary circulating liquid module, a quaternary circulating liquid module, a fifth circulating liquid module, a circulating liquid conveying mechanism and a solid fertilizer module are provided outside the circulating tower module; wherein the primary circulating liquid module is provided at the lower part of the inside of the circulating tower module. In addition, according to the use requirements, the primary circulating liquid module and the secondary circulating liquid module can be interchanged, and the matching circulating liquid conveying mechanism is also interchanged. Each circulating liquid module is equipped with a circulating liquid conveying mechanism and a density control module, wherein the circulating liquid conveying mechanism and the density control module are correspondingly interlocked and mutually controlled. The circulating tower module is connected to each circulating liquid module through multiple sets of circulating liquid conveying mechanisms outside; at the same time, in order to control the density of each circulating liquid module, the density of the circulating liquid module is gradually reduced; the density of each circulating liquid module is controlled, and the solution of the circulating liquid module with a density lower than that of the circulating liquid module is used to replenish the liquid, that is: the solution of the five-level circulating liquid module replenishes the four-level circulating liquid module, the solution of the four-level circulating liquid module replenishes the three-level circulating liquid module, the solution of the three-level circulating liquid module replenishes the two-level circulating liquid module, and the solution of the two-level circulating liquid module replenishes the one-level circulating liquid module. In addition, when the operation requires, the solution of the two-level circulating liquid module can also overflow to the one-level circulating liquid module through the overflow pipe.As the desulfurization system continues to operate, the liquid density of the primary circulating liquid module reaches the specified requirement, and the slurry liquid is sent to the subsequent solid fertilizer module through the circulating liquid conveying mechanism to produce solid fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a multi-stage circulating liquid density module control device for ammonia desulfurization of the present application;

[0019] Among them, 1. primary circulating liquid module, 2. secondary circulating liquid module, 3. tertiary circulating liquid module, 4. quaternary circulating liquid module, 5. quintuple circulating liquid module, 6. circulating tower module, 7. circulating liquid conveying mechanism, 8. cooling module, 9. reaction module, 10. washing module, 11. demisting module, 12. flue gas channel, 13. spray layer, 14. tower module accessories, 15. density control module, 16. solid fertilizer module, 17. overflow pipe, 18. flue gas inlet, 19. flue gas discharge port. DETAILED DESCRIPTION

[0020] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] See also Figure 1 A multi-stage circulating liquid density module control device for ammonia desulfurization includes a multi-stage circulating liquid module, a circulating tower module 6, a plurality of sets of circulating liquid conveying mechanisms 7, a plurality of sets of density control modules 15 and a solid fertilizer module 16.

[0022] A cooling module 8, a reaction module 9, a washing module 10 and a demisting module 11 are arranged inside the circulation tower module 6 along the direction of the flue gas from bottom to top. The outside of the circulation tower module 6 is connected to the multi-stage circulation liquid module and the solid fertilizer module 16 through several sets of circulation liquid conveying mechanisms 7.

[0023] In a preferred embodiment, a smoke inlet 18 is provided on the cooling module 8 , a smoke exhaust port 19 is provided above the demisting module 11 , and the primary circulating liquid module 1 is connected to the solid fertilizer module 16 via the circulating liquid conveying mechanism 7 .

[0024] Each of the cooling module 8 , the reaction module 9 , the washing module 10 and the demisting module 11 is provided with one or more flue gas channels 12 , one or more spray layers 13 and one or more tower module accessories 14 .

[0025] The circulating liquid delivery mechanism 7 is used to deliver liquid and circulate liquid, and is composed of a circulating liquid pump, a circulating liquid pipe, a branch pipe and a valve, etc. The branch pipe of each circulating liquid delivery mechanism 7 is connected to each circulating liquid module. The circulating liquid module is used to store liquid and ensure the residence time of the circulating liquid. The density control module 15 can display the liquid density, including a densitometer, a branch pipe and a valve. The tower module accessories are the fillers, ring plates, partitions, etc. inside the conventional desulfurization tower, which can be selectively added according to actual needs.

[0026] The multi-stage circulating liquid module includes a set of circulating liquid modules arranged at the bottom of the circulating tower module 6 and several sets of circulating liquid modules arranged outside the circulating tower module 6. There are 2 or more sets of external circulating liquid modules, and each set of circulating liquid modules is equipped with a density control module 15 that can display the liquid density.

[0027] The reaction module 9 includes one or more stages of reaction modules, and the washing module 10 includes one or more stages of washing modules. Each stage of the reaction module or each stage of the washing module is correspondingly connected to a set of circulating liquid modules and a set of circulating liquid conveying mechanism 7. Each stage of the reaction module includes one or more layers of spray layers 13 and tower module accessories 14, and each stage of the washing module includes a layer of spray layer 13 and tower module accessories 14. Each stage of the reaction modules or each stage of the washing modules are separated by a flue gas channel 12.

[0028] The reaction module 9 includes a two-stage reaction module, the washing module 10 includes a two-stage washing module, the cooling module 8 is connected to the primary circulating liquid module 1, the primary reaction module of the reaction module 9 is connected to the secondary circulating liquid module 2, the secondary reaction module of the reaction module 9 is connected to the tertiary circulating liquid module 2, and the first and second washing modules of the washing module 10 are respectively connected to the fourth circulating liquid module 4 and the fifth circulating liquid module 5; the spray liquid and the return liquid of each stage of the reaction module are connected to the secondary circulating liquid module 2 and the third circulating liquid module 3 through the corresponding circulating liquid conveying mechanism 7, and the spray liquid and the return liquid of each stage of the washing module are connected to the fourth circulating liquid module 4 and the fifth circulating liquid module 5 through the corresponding circulating liquid conveying mechanism 7, and the density of the liquid in the multi-stage circulating liquid module decreases from the first stage to the fifth stage.

[0029] The primary circulating liquid module 1 is arranged at the lower part of the circulating tower module 6 , and the secondary circulating liquid module 2 , the tertiary circulating liquid module 3 , the quaternary circulating liquid module 4 and the quintuple circulating liquid module 5 are arranged outside the circulating tower module 6 .

[0030] The secondary circulating liquid module 2 is arranged at the lower part of the circulating tower module 6 , and the primary circulating liquid module 1 , the tertiary circulating liquid module 3 , the quaternary circulating liquid module 4 and the quintuple circulating liquid module 5 are arranged outside the circulating tower module 6 .

[0031] The multi-stage circulating liquid module is interlocked and mutually controlled with each circulating liquid conveying mechanism 7 and density control module 15. The density control module 15 of the circulating liquid module with higher density is interlocked with the circulating liquid conveying mechanism 7 of the circulating liquid module with lower density. The liquid of the circulating liquid module with higher density comes from the circulating liquid module with lower density. The secondary circulating liquid module 2 is connected to the primary circulating liquid module 1 through the overflow pipe 17.

[0032] The cooling module 8 is provided with two spray layers 13, one of which is connected to the primary circulating liquid module 1 through the circulating liquid delivery mechanism 7; the other spray layer 13 is connected to the secondary circulating liquid module 2 through the circulating liquid delivery mechanism 7 connected to the reaction module 9, and the density control module 15 of the secondary circulating liquid module 2 interlocks and controls the circulating liquid delivery mechanism 7 connected thereto to control the flushing of the cooling module 8 and the density of the primary circulating liquid module 1, and the water spraying directions of the two spray layers 13 are opposite.

[0033] Among them, the cooling module 8 has two spray layers 13. The spray layer 13 with the nozzle facing downward is connected to the primary circulating liquid module 1 through the circulating liquid conveying mechanism 7, which acts on cooling the flue gas; the spray layer 13 with the nozzle facing upward is connected to the circulating liquid conveying mechanism 7 of the secondary circulating liquid module 2, which acts on flushing the cooling module 8 and replenishing the primary circulating liquid module 1. As the desulfurization system continues to operate, the density of the primary circulating liquid module 1 increases. When it reaches the specified value, the slurry is delivered to the solid fertilizer module 16 through the circulating liquid conveying mechanism 7 to produce solid ammonium sulfate. The circulating liquid conveying mechanism 7 and the density control module 15 are used for process control. The primary and secondary reaction spray layers 13 of the reaction module 9 are connected to the secondary and tertiary circulating liquid modules 2 and 3 through the circulating liquid delivery mechanism 7. The number of spray layers 13 is determined according to the process requirements; the replenishment of the secondary circulating liquid module 2 comes from the circulating liquid delivery mechanism 7 of the tertiary circulating liquid module 3, and the replenishment of the tertiary circulating liquid module 3 comes from the circulating liquid delivery mechanism 7 of the quaternary circulating liquid module 4. The density of the secondary and tertiary circulating liquid modules 2 and 3 is controlled by the density control module 15 interlocking the circulating liquid delivery mechanism 7. The first and second washing spray layers 13 of the washing module 10 are connected to the fourth and fifth circulating liquid modules through the circulating liquid conveying mechanism 7. Each washing module is equipped with a spray layer 13 and a tower module accessory 14. The replenishment of the fourth circulating liquid module 4 comes from the circulating liquid conveying mechanism 7 of the fifth circulating liquid module 5. The density of the fourth circulating liquid module 4 is controlled by the density control module 15 interlocking the circulating liquid conveying mechanism 7. The replenishment of the fifth circulating liquid module 5 comes directly from the process water or desalted water of the desulfurization system. The density of the first circulating liquid module 1 to the fifth circulating liquid module 5 is formed to be a gradient decrease, that is, the density of the first circulating liquid module 1> the density of the second circulating liquid module 2> the density of the third circulating liquid module 3> the density of the fourth circulating liquid module 4> the density of the fifth circulating liquid module 5. In addition, the first circulating liquid module 1 is arranged at the lower part of the circulating tower module 6. The first circulating liquid module 1 and the second circulating liquid module 2 can be interchanged, and the matching circulating liquid conveying mechanism 7 should also be interchanged. The solution of the second circulating liquid module 2 can also overflow to the first circulating liquid module 1 through the overflow pipe 17.

[0034] The function of the solid fertilizer module 16 is to separate the solid from the liquid in the first-level circulating liquid module 1 at the lower part of the circulating tower module 6 and dry the ammonium sulfate fertilizer product with a moisture content of less than 1%. The solid fertilizer module 16 includes a cyclone, a centrifuge, a vibrating fluidized bed, a screw conveyor, a baler, etc. It is a conventional solid fertilizer module design in the art.

[0035] The working process of the utility model is as follows: the flue gas passes through the flue gas inlet 18 and sequentially enters the cooling module 8, the reaction module 9, the washing module 10 and the demisting module 11 in the circulation tower module 6 to be processed and meet the emission standards. At the same time, the sulfur dioxide in the flue gas generates ammonium sulfate circulating liquid. The device allows each circulating liquid to circulate independently through the flue gas channel 12 arranged in each module, thereby widening the density difference between each functional area. At the same time, the circulating liquid is sent back to the corresponding circulating liquid modules at each level through the circulating liquid conveying mechanism 7, and repeatedly acts with the spray layer 13 to increase the density of each circulating liquid. During the process, the density control module 15 is linked to the circulating liquid conveying mechanism 7 to control the conveying and return of each circulating liquid module to the required value.

[0036] The utility model discloses a multi-stage circulating liquid density module control device for ammonia-based desulfurization, which reasonably controls the circulating liquid density and forms a circulating liquid density gradient from the source, thereby avoiding the problems of flue gas emission index fluctuation, abnormal operating parameters, solid fertilizer crystallization, etc. caused by excessively high circulating liquid density; at the same time, it can improve the absorption reaction of flue gas and the oxidation reaction of oxidizing liquid, jointly solve the common and outstanding problems in ammonia-based desulfurization, ensure the accurate control and coordinated control of the desulfurization system, and reduce the operating cost and maintenance cost.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A multi-stage circulating liquid density module control device for ammonia desulfurization, characterized in that The invention comprises a multi-stage circulating liquid module, a circulating tower module (6), a plurality of circulating liquid conveying mechanisms (7), a plurality of density control modules (15) and a solid fertilizer module (16); a cooling module (8), a reaction module (9), a washing module (10) and a demisting module (11) are arranged inside the circulating tower module (6) along the direction of the flue gas from bottom to top; and the outside of the circulating tower module (6) is connected to the multi-stage circulating liquid module and the solid fertilizer module (16) via a plurality of circulating liquid conveying mechanisms (7).

2. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 1 is characterized in that: Each of the cooling module (8), the reaction module (9), the washing module (10) and the demisting module (11) is provided with one or more smoke channels (12), one or more spray layers (13) and one or more tower module accessories (14).

3. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 2 is characterized in that: The multi-stage circulating liquid module comprises a set of circulating liquid modules arranged at the lower part of the circulating tower module (6) and a plurality of sets of circulating liquid modules arranged outside the circulating tower module (6), wherein two or more sets of the external circulating liquid modules are arranged, and each set of the circulating liquid modules is equipped with a density control module (15) capable of displaying the density of the liquid.

4. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 3 is characterized in that: The reaction module (9) includes one or more stages of reaction modules, and the washing module (10) includes one or more stages of washing modules. Each stage of the reaction module or each stage of the washing module is connected to a set of circulating liquid modules and a set of circulating liquid conveying mechanisms (7). Each stage of the reaction module includes one or more layers of spray layers (13) and tower module accessories (14). Each stage of the washing module includes one layer of spray layers (13) and tower module accessories (14). Each stage of the reaction modules or each stage of the washing modules are separated by a flue gas channel (12).

5. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 4 is characterized in that: The reaction module (9) comprises two-stage reaction modules, the washing module (10) comprises two-stage washing modules, the cooling module (8) is connected to a primary circulating liquid module (1), the primary reaction module of the reaction module (9) is connected to a secondary circulating liquid module (2), the secondary reaction module of the reaction module (9) is connected to a tertiary circulating liquid module (3), and the primary and secondary washing modules of the washing module (10) are respectively connected to a quaternary circulating liquid module (4) and a quintuple circulating liquid module (5); the spray liquid and return liquid of each stage of the reaction module are connected to the secondary circulating liquid module (2) and the tertiary circulating liquid module (3) through a corresponding circulating liquid conveying mechanism (7), and the spray liquid and return liquid of each stage of the washing module are connected to the quaternary circulating liquid module (4) and the quintuple circulating liquid module (5) through a corresponding circulating liquid conveying mechanism (7).

6. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 5, characterized in that: The primary circulating liquid module (1) is arranged at the lower part of the circulating tower module (6), and the secondary circulating liquid module (2), the tertiary circulating liquid module (3), the quaternary circulating liquid module (4) and the quintuple circulating liquid module (5) are arranged outside the circulating tower module (6).

7. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 5, characterized in that: The secondary circulating liquid module (2) is arranged at the lower part of the circulating tower module (6), and the primary circulating liquid module (1), the tertiary circulating liquid module (3), the quaternary circulating liquid module (4) and the quintuple circulating liquid module (5) are arranged outside the circulating tower module (6).

8. The multi-stage circulating liquid density module control device for ammonia desulfurization according to any one of claims 5 to 7, characterized in that: The multi-stage circulating liquid module is interlocked and mutually controlled with each circulating liquid delivery mechanism (7) and density control module (15); the density control module (15) of the circulating liquid module with a higher density is interlocked with the circulating liquid delivery mechanism (7) of the circulating liquid module with a lower density; the liquid of the circulating liquid module with a higher density comes from the circulating liquid module with a lower density; the secondary circulating liquid module (2) is connected to the primary circulating liquid module (1) via an overflow pipe (17).

9. The multi-stage circulating liquid density module control device for ammonia desulfurization according to claim 5, characterized in that: The cooling module (8) is provided with two spray layers (13), one of which is connected to the primary circulating liquid module (1) via a circulating liquid delivery mechanism (7); the other spray layer (13) is connected to the secondary circulating liquid module (2) via the circulating liquid delivery mechanism (7) connected to the reaction module (9); the density control module (15) of the secondary circulating liquid module (2) interlocks with the circulating liquid delivery mechanism (7) connected thereto to control the flushing cooling module (8) and the density of the primary circulating liquid module (1); the water spraying directions of the two spray layers (13) are opposite.

10. The multi-stage circulating liquid density module control device for ammonia desulfurization according to any one of claims 1 to 7 or 9, characterized in that: A smoke inlet (18) is provided on the cooling module (8), a smoke exhaust port (19) is provided above the demisting module (11), and the primary circulating liquid module (1) is connected to the solid fertilizer module (16) via a circulating liquid conveying mechanism (7).

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