Flue gas deamination process and flue gas deamination system

Abstract

The invention discloses a flue gas deamination process and a deamination system. The flue gas deamination process comprises the following steps: introducing flue gas into a flue gas treatment tower; introducing oxygen into the flue gas treatment tower to promote the oxidation reaction of sub-valence sulfur substances in the flue gas treatment tower; inputting a treatment agent into the flue gas treatment tower, and mixing the treatment agent with the aqueous solution in the liquid storage area to form an absorbent; an absorbent in a liquid storage area at the lower part of the flue gas treatment tower is conveyed to a spraying assembly at the upper part, and the spraying assembly sprays the absorbent downwards; by controlling the flow of the spraying assembly, the absorbent penetrates through the core processor located below the spraying assembly, and meanwhile, a plurality of layers of water films are formed in the core processor, so that flue gas flowing upwards penetrates through the core processor, penetrates through the plurality of layers of water films and reacts with the absorbent at the same time; carrying out demisting treatment on the flue gas penetrating through the water film through a demisting assembly positioned above the spraying assembly; and when the concentration of the salt substances in the liquid storage area exceeds a set value, the waste liquid in the liquid storage area is conveyed to the waste liquid treatment subsystem, and the salt substances in the waste liquid are recycled by the waste liquid treatment subsystem. According to the flue gas deamination process, ammonia in the flue gas can be fully treated, the flue gas treatment efficiency is improved, the flue gas treatment complexity is reduced, meanwhile, formed waste liquid can be recycled again, various beneficial substances are fully utilized, and the economic value is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas environmental protection treatment, and in particular, to a flue gas denitrification process and a flue gas denitrification system. Background Art

[0002] In production environments such as cement plants and power plants, flue gas needs to be treated. The treatment process includes, but is not limited to, desulfurization, denitrification, and carbon dioxide capture of the flue gas. However, in related technologies, the processes of denitrification and desulfurization of flue gas are relatively complex, often requiring multiple times, and there is a lack of subsequent treatment of waste liquid and recycling of beneficial substances. Summary of the Invention

[0003] The main object of the present invention is to provide a flue gas denitrification process and a flue gas denitrification system to solve the problems that in related technologies, the processes of denitrification and desulfurization of flue gas are relatively complex, often requiring multiple times, with low treatment efficiency, and there is a lack of subsequent treatment of waste liquid and recycling of beneficial substances.

[0004] To achieve the above object, the present invention provides a flue gas denitrification process, including:

[0005] Introducing the flue gas into a flue gas treatment tower to make the flue gas flow upward in the flue gas treatment tower;

[0006] Introducing oxygen into the flue gas treatment tower through an oxygen input subsystem to promote the oxidation reaction of substances containing sulfur in a lower valence state in the flue gas treatment tower;

[0007] Inputting a treatment agent into the flue gas treatment tower and mixing it with the aqueous solution in the liquid storage area to form an absorbent;

[0008] Transporting the absorbent in the lower liquid storage area of the flue gas treatment tower to the upper spray assembly through an absorbent circulation subsystem, and spraying the absorbent downward by the spray assembly;

[0009] By controlling the flow rate of the spray assembly, when the absorbent passes through the core processor located below the spray assembly, multiple layers of water films are formed in the core processor, so that the upward-flowing flue gas passes through the core processor while passing through multiple layers of water films and reacts with the absorbent. The absorbent absorbs ammonia in the flue gas and forms salt substances and returns to the liquid storage area;

[0010] Performing demisting treatment on the flue gas passing through the water film through a demisting assembly located above the spray assembly, and discharging the demisted flue gas from the flue gas outlet of the flue gas treatment tower;

[0011] When the concentration of salt substances in the liquid storage area exceeds the set value, transporting the waste liquid in the liquid storage area to a waste liquid treatment subsystem, and the waste liquid treatment subsystem recycles the salt substances in the waste liquid.

[0012] Further, at least two processing plates are arranged in the core processor, and the two processing plates are distributed along the axial direction of the flue gas treatment tower;

[0013] By controlling the flow rate of the spraying assembly, when the absorbent passes through the two processing plates located below the spraying assembly, water films are formed on the surfaces of the two processing plates. The flue gas passes through the water films on the lower processing plate and the water film on the upper processing plate in sequence, so that the flue gas and the absorbent undergo two full absorption reactions in the core processor.

[0014] Further, the waste liquid in the liquid storage area is transported to the waste liquid treatment subsystem, and the waste liquid treatment subsystem recycles the salt substances in the waste liquid, including:

[0015] The waste liquid in the liquid storage area is transported to the water treatment module, and the water treatment module purifies the waste liquid. The treated purified water returns to the flue gas treatment tower to obtain the treated concentrated salt water;

[0016] The concentrated salt water is transported to the buffer tank for buffering;

[0017] The concentrated salt water in the buffer tank is transported to the decomposition furnace for recycling; and / or,

[0018] The concentrated salt water in the buffer tank is transported to the grate cooler for recycling.

[0019] Further, transporting the concentrated salt water in the buffer tank to the decomposition furnace for recycling includes:

[0020] The concentrated salt water is transported to the decomposition furnace. Under a high-temperature environment, ammonium sulfate in the concentrated salt water is decomposed into sulfate radicals and ammonia. The sulfate radicals react with calcium oxide decomposed from calcium carbonate in the decomposition furnace to form calcium sulfate, and the ammonia reacts with nitrogen oxides in the furnace for denitrification.

[0021] Further, transporting the concentrated salt water in the buffer tank to the grate cooler for recycling includes:

[0022] The concentrated salt water is transported to the high-temperature section of the grate cooler. Under a high-temperature environment, ammonium sulfate in the concentrated salt water is decomposed into sulfate radicals and ammonia. The sulfate radicals react with calcium oxide on the surface of the clinker in the grate cooler to form calcium sulfate;

[0023] The ammonia is transported to the kiln and furnace with the secondary and tertiary air for denitrification.

[0024] Further, a smoke collecting subsystem is arranged at the top of the flue gas treatment tower, and the smoke collecting subsystem adsorbs the tiny droplets of the flue gas passing through the demisting component.

[0025] Further, the smoke collection subsystem includes a smoke collection hood and an exhaust pipe. The smoke collection hood is arranged in a conical shape, and a first ventilation opening is provided on the smoke collection hood. The first ventilation opening is connected to the exhaust pipe, and the exhaust pipe is communicated with the flue gas outlet;

[0026] A second ventilation opening is provided on the smoke collection hood, and a third ventilation opening is provided on the exhaust pipe. The second ventilation opening and the third ventilation opening are communicated through a pipe, and the orientation of the third ventilation opening deviates from the axis of the exhaust pipe;

[0027] The flue gas is divided into two paths from the smoke collection hood. The first path enters the exhaust pipe through the first ventilation opening and flows upward inside the exhaust pipe;

[0028] The second path enters the exhaust pipe tangentially from the exhaust pipe through the second ventilation opening, the pipe and the third ventilation opening. The self - speed of the flue gas is used to provide a tangential thrust to the flue gas inside the exhaust pipe, so that the flue gas spirally rises as a whole inside the exhaust pipe. During the spiral rising process, the tiny droplets carried by the flue gas come into contact with the inner wall of the exhaust pipe and adhere to the inner wall.

[0029] Further, during the flue gas treatment process, part of the liquid in the liquid storage area circulates between the liquid storage area and the absorption area pit subsystem, and the absorption agent after participating in the flue gas treatment is detected through the absorption area pit subsystem.

[0030] Further, during the maintenance period, the absorption agent in the liquid storage area is transported to the absorption agent buffer system for buffering, and after the maintenance, the absorption agent in the absorption agent buffer system is transported back to the liquid storage area.

[0031] According to another aspect of the present invention, a flue gas de - ammonia system is provided. The flue gas de - ammonia system is used for performing the above - mentioned flue gas de - ammonia process. The flue gas de - ammonia system includes:

[0032] A flue gas treatment tower, in which a core processor, a spraying assembly and a demisting assembly are sequentially arranged from bottom to top. A flue gas outlet is provided at the upper end of the flue gas treatment tower, a flue gas inlet is provided on the flue gas treatment tower, and a liquid storage area is provided at the lower part of the flue gas treatment tower;

[0033] The flue gas inlet is located between the core processor and the liquid storage area. The flue gas converges with the absorption agent sprayed by the spraying assembly at the core processor, and the flue gas is de - ammoniated by the absorption agent;

[0034] An absorption agent circulation subsystem, the first end of which is communicated with the liquid storage area, and the second end is communicated with the spraying assembly, and is used for circulating and transporting the absorption agent in the liquid storage area to the spraying assembly for downward spraying;

[0035] A chemical agent delivery subsystem, which is in communication with the liquid storage area and is used to deliver a treatment chemical agent to the liquid storage area;

[0036] A waste liquid treatment subsystem, which is in communication with the liquid storage area and is used to recycle and treat waste liquid;

[0037] An oxygen input subsystem, which is used to input oxygen into the flue gas treatment tower to promote the oxidation reaction of substances containing sulfur in sub-valent states in the flue gas treatment tower.

[0038] In the process of flue gas deammoniation treatment of the present invention, the flue gas is introduced into the flue gas treatment tower through the flue gas inlet at the lower part of the tower. A treatment chemical agent capable of absorbing ammonia in the flue gas is introduced into the liquid storage area at the lower part of the flue gas treatment tower. The treatment chemical agent and the aqueous solution are mixed in the liquid storage area to form an absorbent. The absorbent circulation subsystem transports the absorbent in the liquid storage area to the spraying assembly, and sprays the absorbent downward onto the core processor through the spraying assembly, and a water film with a certain thickness is formed on the core processor, and the water film is multi-layered. The upward flowing flue gas fully contacts and reacts with the absorbent during the process of passing through the water film, so as to remove ammonia in the flue gas. The flue gas that has been absorbed and treated by the core processor continues to flow upward and continuously contacts the absorbent sprayed downward to further absorb and treat the remaining ammonia in the flue gas; the treated flue gas mixed with liquid droplets flows upward to the demisting assembly, and when passing through the demisting assembly, the demisting assembly adsorbs the liquid droplets mixed in the flue gas for gas-liquid separation. The separated flue gas is discharged from the flue gas outlet at the upper part of the flue gas treatment tower, and the separated liquid droplets flow downward to the liquid storage area.

[0039] During the treatment process, oxygen is input into the flue gas treatment tower through the oxygen input subsystem to promote the oxidation reaction of substances containing sulfur in sub-valent states in the flue gas treatment tower. For example, sulfur dioxide is converted into sulfur trioxide, which dissolves in water to form sulfuric acid, and can form calcium sulfate, which can be directly used as an industrial product after subsequent reaction with calcium; the waste liquid formed after flue gas treatment is transported out through the waste liquid treatment subsystem and the waste liquid is recycled and treated to extract beneficial substances in the waste liquid and reduce the content of harmful substances in the waste liquid.

[0040] Through this flue gas deammoniation process of the present invention, ammonia in the flue gas can be fully treated in one treatment process, improving the flue gas treatment efficiency and reducing the complexity of flue gas treatment. Moreover, during the treatment process, the oxidation reaction of substances containing sulfur in sub-valent states in the tower can be promoted to facilitate subsequent recycling. At the same time, the formed waste liquid can be recycled and treated again to make full use of various beneficial substances and improve the economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention, making other features, objectives, and advantages of the present invention more apparent. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0042] Figure 1 is a schematic diagram of a flue gas treatment system according to an embodiment of the present invention;

[0043] Figure 2 is a schematic structural diagram of a processor according to an embodiment of the present invention;

[0044] Figure 3 is a schematic structural diagram of a single processing unit according to an embodiment of the present invention;

[0045] Figure 4 is a schematic structural diagram of a support structure according to an embodiment of the present invention;

[0046] Figure 5 is a schematic structural diagram of two layers of processing plates according to an embodiment of the present invention;

[0047] Figure 6 is a top view structural diagram of a processing plate according to an embodiment of the present invention;

[0048] Figure 7 is Figure 5 a schematic structural diagram of a quarter of the processing plate in;

[0049] Figure 8 is a schematic structural diagram of a rectangular plate according to an embodiment of the present invention;

[0050] Figure 9 is a schematic structural diagram of a smoke collection subsystem according to an embodiment of the present invention;

[0051] Among them, 1. Processing unit; 2. Support structure; 201. Arc-shaped support plate; 202. Support beam; 203. Diagonal brace; 3. Processing plate; 30. Through hole; 31. Plate; 310. Special-shaped plate; 311. Rectangular plate; 4. Partition; 40. Horizontal plate; 41. Vertical plate; 5. Chamber; 6. Flue gas treatment tower; 601. Oxygen inlet; 602. Flue gas inlet; 603. Flue gas outlet; 7. Core processor; 8. Spraying assembly; 801. First nozzle; 802. Second nozzle; 803. Third nozzle; 9. Demisting assembly; 10. Liquid storage area; 11. Absorbent circulation subsystem; 110. First circulation pump; 111. Second circulation pump; 112. Third circulation pump; 12. Oxygen input subsystem; 120. Oxidation blower; 13. Dust collector; 14. Tail gas exhaust fan; 15. Waste liquid treatment subsystem; 150. Water treatment module; 151. Buffer tank; 152. Grate cooler; 153. Calciner; 16. Absorption area pit subsystem; 17. Absorbent buffer system; 18. Chemical agent delivery subsystem; 180. Alkaline chemical agent delivery assembly; 181. Acidic chemical agent delivery assembly; 19. Smoke collection subsystem; 190. Smoke collection hood; 191. Second vent; 192. Third vent; 193. Exhaust pipe; 194. First vent. Detailed implementation mode

[0052] To solve related technical problems, such as Figure 2 As shown, an embodiment of the present invention provides a flue gas deammoniation system, including:

[0053] A flue gas treatment tower 6, in which a core processor 7, a spraying assembly 8 and a demisting assembly 9 are sequentially arranged from bottom to top. A flue gas outlet 603 is arranged at the upper end of the flue gas treatment tower 6, a flue gas inlet 602 is arranged on the flue gas treatment tower 6, and a liquid storage area 10 is arranged at the lower part of the flue gas treatment tower 6;

[0054] The flue gas inlet 602 is located between the core processor 7 and the liquid storage area 10. Under the action of the spraying assembly, multiple water films can be formed in the core processor. The flue gas and the absorbent sprayed by the spraying assembly 8 converge in the core processor 7, and the flue gas is deammoniated during the process of passing through the water film;

[0055] An absorbent circulation subsystem 11, the first end of the absorbent circulation subsystem 11 is communicated with the liquid storage area 10, and the second end is communicated with the spraying assembly 8, and is used for circulating and transporting the absorbent in the liquid storage area 10 to the spraying assembly 8 for downward spraying by the spraying assembly 8;

[0056] A chemical agent delivery subsystem 18, the chemical agent delivery subsystem 18 is communicated with the liquid storage area 10, and is used for delivering treatment chemicals to the liquid storage area 10;

[0057] The waste liquid treatment subsystem 15 is connected to the liquid storage area 10 and is used for recycling and treating waste liquid.

[0058] The oxygen input subsystem 12 is used for inputting oxygen into the flue gas treatment tower 6 to promote the oxidation reaction of substances containing sulfur in the lower valence state in the flue gas treatment tower 6.

[0059] In this embodiment, the flue gas treatment system is used to treat the tail gas of a cement kiln, mainly for deammoniation of the tail gas of the cement kiln. The flue gas treatment process includes: the flue gas is introduced into the flue gas treatment tower 6 through the flue gas inlet 602 at the lower part of the flue gas treatment tower 6. The chemical agent delivery subsystem 18 introduces a treatment chemical agent capable of absorbing ammonia in the flue gas into the liquid storage area 10 at the lower part of the flue gas treatment tower 6. The treatment chemical agent and the aqueous solution are mixed in the liquid storage area 10 to form an absorbent, and the absorbent circulation subsystem 11 transports the absorbent in the liquid storage area 10 to the spray assembly 8. The absorbent is sprayed downward from the spray assembly 8 onto the central processor 7, and multiple water films are formed on the central processor 7. The flue gas entering the flue gas treatment tower 6 flows from bottom to top and converges with the sprayed absorbent in the central processor 7. Most of the substances to be treated in the flue gas, such as ammonia and sulfur, are washed off during the process of passing through the water film. The flue gas passing through the central processor 7 continues to flow upward and continuously contacts the absorbent sprayed downward, further absorbing and treating the remaining substances to be treated in the flue gas. The treated flue gas mixture droplets flow upward to the demisting assembly 9. When passing through the demisting assembly 9, the demisting assembly 9 adsorbs the mixed droplets in the flue gas for gas-liquid separation. The separated flue gas is discharged from the flue gas outlet 603 at the upper part of the flue gas treatment tower 6, and the separated droplets flow downward to the liquid storage area 10.

[0060] During the treatment process, the oxygen input subsystem 12 inputs oxygen into the flue gas treatment tower 6 to promote the oxidation reaction of substances containing sulfur in the lower valence state in the flue gas treatment tower 6. For example, sulfur dioxide is converted into sulfur trioxide, which dissolves in water to form sulfuric acid. After reacting with calcium in the subsequent process, calcium sulfate can be directly formed as an industrial product. The waste liquid formed after flue gas treatment is transported out through the waste liquid treatment subsystem 15, and the waste liquid is recycled and treated to extract the beneficial substances in the waste liquid and reduce the content of harmful substances in the waste liquid.

[0061] Specifically, in this embodiment, the internal structure of the flue gas treatment tower 6 includes a central processor 7, a spray assembly 8, and a demisting assembly 9 arranged in sequence from bottom to top. Among them, the central processor 7 is the area where the flue gas and the absorbent converge. The flue gas is fully treated and absorbed in the central processor 7, and most or all of the substances to be treated in the flue gas, including ammonia, sulfur, nitrogen, solid impurities in the flue gas, etc., are washed off by the absorbent. The absorbent sprayed from the spray assembly 8 washes off the substances to be treated in the flue gas after passing through the central processor 7 and flows downward into the liquid storage area 10.

[0062] The core processor 7 may include a processing plate with a hole structure. The downward-flowing absorbent can flow through the hole structure and form a water film on the processing plate at the same time. The flue gas can pass through the water film and flow upward. During the process of passing through the water film, the absorbent treats the flue gas. The formation and thickness of the water film can be controlled by controlling the liquid spraying amount of the spraying component 8. Theoretically, when the liquid spraying amount exceeds the flow rate of the hole structure, a water film can be formed. The greater the liquid spraying amount, the thicker the water film, and the greater the resistance of the thicker water film to the flue gas. Therefore, an appropriate liquid spraying amount can be selected to form a water film with an appropriate thickness, which can not only fully treat the flue gas but also ensure that the flue gas still has a certain speed after treatment to improve the flue gas treatment efficiency.

[0063] The flue gas passing through the core processor 7 and the spraying component 8 contains some droplets. The droplets contain absorbent and some substances dissolved in the absorbent. Therefore, it is necessary to remove the droplets in the flue gas before the flue gas is discharged. In this embodiment, the demisting component 9 located above the spraying component 8 is used to remove the droplets in the flue gas. Since the flue gas entering the flue gas treatment tower 6 has a certain initial speed and still keeps flowing upward at a certain speed even after being treated in contact with the absorbent. The flue gas with a certain speed carries the droplets and flows upward to contact the demisting component 9. The flow direction of the flue gas is changed by the blocking member in the demisting component 9 to block the flue gas. Since the flue gas can change its direction and continue to flow upward after being blocked as a gas, while the droplets in the flue gas will be adsorbed on the blocking member and drip and flow downward after gathering. In one embodiment, the demisting component 9 includes a plurality of baffle plates, and the resistance during the flow of the flue gas is increased by the baffle plates to remove the droplets in the flue gas.

[0064] As Figure 2 shown, the absorbent circulation subsystem 11, the chemical agent delivery subsystem 18, the waste liquid treatment subsystem 15, and the oxygen input subsystem 12 are connected to the flue gas treatment tower 6 as external systems. Among them, the absorbent circulation subsystem 11 is used to continuously transport the absorbent in the liquid storage area 10 to the spraying component 8, and the absorbent sprayed by the spraying component 8 flows back to the liquid storage area 10 after treating the flue gas. In one embodiment, the absorbent circulation subsystem 11 mainly includes one or more circulation pumps.

[0065] The chemical agent delivery subsystem 18 is used to deliver the treatment chemical agent to the liquid storage area 10 of the flue gas treatment tower 6, and the treatment chemical agent forms an absorbent by mixing with the aqueous solution in the liquid storage area 10. According to different treatment requirements, the chemical agent delivery subsystem 18 delivers different types of treatment chemical agents to the liquid storage area 10. The aqueous solution in the liquid storage area 10 can be directly input through a water tank and a water pump.

[0066] Since the absorbent after flue gas treatment still flows back to the liquid storage area 10, after a period of treatment, a large amount of waste liquid will be stored in the liquid storage area 10. Therefore, it is necessary to treat the waste liquid. In this embodiment, the waste liquid treatment subsystem 15 pumps out and treats the waste liquid in the liquid storage area 10, and utilizes the beneficial substances in the waste liquid. The specific treatment method can be determined by analyzing the components of the waste liquid.

[0067] The oxygen input subsystem 12 is used to input oxygen into the flue gas treatment tower 6 to promote the treatment of flue gas and the subsequent recovery treatment of waste liquid, reduce the complexity in the subsequent treatment process, and improve the economic value.

[0068] Through this flue gas deammoniation system, the present invention can fully treat ammonia in flue gas in a single treatment process, improve the flue gas treatment efficiency, reduce the complexity of flue gas treatment, and promote the oxidation reaction of substances containing sulfur in the sub-valent state in the tower during the treatment process to facilitate subsequent recovery. At the same time, the formed waste liquid can be recycled and treated again, making full use of various beneficial substances and improving the economic value.

[0069] To further improve the treatment efficiency, as Figure 2 shown, the flue gas can first pass through the dust collector 13, then through the tail exhaust fan 14, and then enter the flue gas treatment tower 6. The dust collector 13 removes dust from the flue gas to reduce the content of solid substances in the flue gas, and the tail exhaust fan 14 accelerates the flue gas to increase the flow rate of the flue gas in the flue gas treatment tower 6.

[0070] In addition, when the flue gas temperature is high, to ensure the treatment effect, it is necessary to reduce the flue gas temperature before the flue gas contacts the absorbent. Therefore, a cooling device can be set in the flue gas treatment tower 6. The cooling device first cools the flue gas entering from the flue gas inlet 602, and the cooled flue gas then flows upward to contact the absorbent. In one embodiment, the cooling device can be a cooling water spraying device arranged in the flue gas treatment tower 6 and corresponding to the flue gas inlet 602. Cooling water is sprayed onto the flue gas inlet 602 through the cooling water spraying device to cool the flue gas.

[0071] Furthermore, to improve the treatment effect of the flue gas in the core processor 7, as Figures 2 to 8 shown, in this embodiment, the core processor 7 includes:

[0072] A support structure 2, which is arranged to allow the solution to flow through and is fixedly connected to the flue gas treatment tower 6;

[0073] Treatment plates 3, a plurality of treatment plates 3 are arranged axially on the support structure 2, and there is a spacing between adjacent treatment plates 3;

[0074] A plurality of through holes 30 are provided on the treatment plate 3, and the aperture and density of the through holes 30 satisfy that the sum of the solution flow rates allowed to pass through the plurality of through holes 30 in a unit time under the non-pressure state is less than the solution flow rate flowing to the treatment plate 3 where the through holes 30 are located in a unit time, so that a water film with a certain thickness can be formed on the upper surface of the treatment plate 3 during the flue gas treatment process.

[0075] The core processor is the core flue gas treatment part in the flue gas treatment tower. In this embodiment, the processor includes a support structure 2 and a treatment plate 3. The support structure 2 is used to install and support the treatment plate 3, and at the same time, the support structure 2 can be installed and fixed in the flue gas treatment tower. Since the solution needs to flow through the processor, the support structure 2 should be able to allow the solution to pass through while meeting the support performance. In one implementation manner, the support structure 2 can adopt a framework structure composed of multiple beams welded or spliced together. In this embodiment, a plurality of treatment plates 3 are provided, and the plurality of treatment plates 3 are arranged axially on the support structure 2. In other words, the plurality of treatment plates 3 are arranged on the support structure 2 in sequence from top to bottom or from bottom to top. A plurality of through holes 30 are formed on the treatment plate 3, and the plurality of through holes 30 are designed and distributed on the treatment plate 3 according to a certain density, and the through holes 30 can allow the solution and the flue gas to pass through.

[0076] As Figure 5 shown, taking the treatment plate 3 being set to two as an example, the solution sprayed by the spraying assembly first flows to the upper treatment plate 3, then flows downward through the through holes 30 on this treatment plate 3 to the lower treatment plate 3, and finally flows to the lower part of the flue gas treatment tower through the through holes 30 of this treatment plate 3. The flue gas is vice versa. First, it passes through the through holes 30 on the lower treatment plate 3, and then passes through the through holes 30 on the upper treatment plate 3. Therefore, in order to increase the reaction time of the flue gas with the solution in the processor, it is expected in this embodiment that a water film with a certain thickness can be formed on the upper surfaces of the two treatment plates 3. After passing through the through holes 30 on the treatment plate 3, the flue gas needs to continue to pass through the water film on the treatment plate 3, and can fully contact the solution during the process of passing through the water film, increasing the residence time and reaction degree of the flue gas.

[0077] In order to form a water film on the treatment plate 3, in this embodiment, the aperture of the through holes 30 should satisfy that the sum of the solution flow rates allowed to pass through the plurality of through holes 30 in a unit time is less than the solution flow rate flowing to the treatment plate 3 where the through holes 30 are located in a unit time. Specifically, the density of the through holes 30 and the aperture of the through holes 30 on a single treatment plate 3 determine the solution flow rate passing through this treatment plate 3 in a unit time. In order to form a water film on the upper surface of the treatment plate 3, the solution flow rate flowing to the treatment plate 3 in a unit time needs to be greater than the solution flow rate flowing through the treatment plate 3 in a unit time. The greater the difference, the thicker the formed water film.

[0078] Generally, the flow rate of the solution flowing upward to the upper treatment plate 3 is relatively close to the flow rate of the solution flowing downward from the upper treatment plate 3 to the lower treatment plate 3. Therefore, the density and aperture of the through-holes 30 of the upper treatment plate 3 are equal to those of the lower treatment plate 3, so that water films with similar thicknesses are formed on the upper treatment plate 3 and the lower treatment plate 3. Of course, the through-holes 30 of the upper treatment plate 3 and the lower treatment plate 3 can also be designed differently to form water films with different thicknesses on the upper and lower layers.

[0079] In addition, it should be noted that the greater the thickness of the water film, the greater the resistance to the flue gas. Therefore, a thicker water film will also reduce the flow rate of the flue gas, resulting in a slower overall flue gas treatment speed. Similarly, the more treatment plates 3 there are, the greater the resistance to the flue gas, which will also reduce the flue gas treatment speed. Therefore, the number of layers of the treatment plates 3 and the thickness of the water film should be designed by comprehensively considering the resistance of the treatment plates 3 to the flue gas and the flow rate of the flue gas.

[0080] Furthermore, since the flue gas enters the tower from one side of the flue gas treatment tower, when the treatment plates 3 are not arranged, the flue gas concentration is relatively high in the space near the flue gas inlet in the tower, and relatively low in the flue gas concentration of the aperture far from the flue gas inlet. After the treatment plates 3 are arranged, due to the resistance of the treatment plates 3 to the flue gas, the flue gas diffuses around after contacting the treatment plates 3, thereby redistributing the flue gas and making the flue gas distribution in the tower relatively uniform. On this basis, when multiple treatment plates 3 are arranged, each treatment plate 3 can play the role of redistributing the flue gas, and thus can further improve the uniformity of the flue gas distribution.

[0081] In this embodiment, after multiple treatment plates 3 are arranged along the axis, when spraying the solution on the treatment plates 3, a water film with a certain thickness is formed on the upper surface of each treatment plate 3 by using the through-holes 30 on the treatment plates 3. The flue gas introduced from below the treatment plates 3 needs to flow upward through the water film. The purpose of using the water film to increase the contact degree and reaction time between the flue gas and the solution is achieved, thereby realizing the technical effect of increasing the reaction time of the flue gas with the solution in the processor, enabling the flue gas to fully react with the solution when passing through the processor, and improving the treatment degree of impurities and gases in the flue gas. Furthermore, the problem that the reaction time between the flue gas and the solution in the treatment tower is short in the related technology, resulting in incomplete flue gas treatment, is solved; and, after increasing the reaction time of the flue gas with the solution, the effective utilization rate of the solution is also improved, and the recovery pressure and usage cost are reduced;

[0082] In one embodiment, the aperture of the through-holes 30 on the upper treatment plate 3 is larger than the aperture of the through-holes 30 on the lower treatment plate 3; and / or

[0083] the density of the through-holes 30 on the upper treatment plate 3 is greater than the density of the through-holes 30 on the lower treatment plate 3.

[0084] Specifically, it should be noted that the flue gas velocity and temperature are relatively high near the flue gas inlet in the flue gas treatment tower. To improve the flue gas treatment effect, it is necessary to quickly reduce the flue gas velocity and temperature and make the flue gas more evenly distributed in the tower. The treatment plate 3 located in the lower layer of the processor is closest to the flue gas inlet, so the above purposes need to be achieved through the treatment plate 3 in the lower layer. To achieve this purpose, it is necessary to make the water film thickness of the treatment plate 3 in the lower layer thicker. Since the flow rate of the solution flowing to the treatment plate 3 is constant, when the number of through holes 30 is the same, to increase the water film thickness, it is necessary to reduce the aperture of the through holes 30 on the treatment plate 3 in the lower layer. When the aperture of the through holes 30 is the same, to increase the water film thickness, it is necessary to reduce the number of through holes 30 on the treatment plate 3 in the lower layer and reduce the density of the through holes 30 on the treatment plate 3 in the lower layer. In actual operation, one of the methods can be selected according to the situation to adjust the water film thickness on the treatment plate 3 in the lower layer, or both methods can be selected simultaneously to adjust the water film thickness on the treatment plate 3 in the lower layer.

[0085] In one embodiment, the through holes 30 on the treatment plate 3 located in the upper layer are misaligned with the through holes 30 on the treatment plate 3 located in the lower layer.

[0086] Specifically, in this embodiment, taking the treatment plate 3 being set as two as an example, the flow path of the flue gas through the processor is as follows: first, it flows in through the through holes 30 on the treatment plate 3 in the lower layer, then flows upward in the space between the two treatment plates 3, and finally flows out through the through holes 30 on the treatment plate 3 in the upper layer. To further improve the distribution uniformity of the flue gas, in this embodiment, the through holes 30 on the upper and lower treatment plates 3 are misaligned, so that the flue gas flowing in through the through holes 30 on the treatment plate 3 in the lower layer will be further blocked by the treatment plate 3 in the upper layer and spread out, and then flow out through the through holes 30 on the treatment plate 3 in the upper layer.

[0087] Optionally, a catalytic coating is provided on the upper surface of the treatment plate 3, and the catalytic coating is used to accelerate the chemical reaction between the flue gas and the solution.

[0088] Specifically, it should be noted that when treating ammonia and sulfur dioxide in the flue gas, the sprayed solution contains sulfate ions. After the solution contacts the flue gas, ammonia and sulfur dioxide in the flue gas react with sulfate ions to generate salts such as ammonium sulfate. Therefore, to accelerate this chemical reaction process, a catalyst can be added. In this embodiment, a catalytic coating is provided on the upper surface of the treatment plate 3, and the catalytic coating is a coating containing a catalyst. Since most of the flue gas treatment process is in the water film on the upper surface of the treatment plate 3, when the catalytic coating is provided on the upper surface of the treatment plate 3, the catalytic coating can catalyze the chemical reaction in the water film, thereby improving the flue gas treatment efficiency.

[0089] In another embodiment, loose catalytic packing is arranged on the upper surface of the treatment plate 3. After the water film is formed, the catalytic packing is located within the water film, and the chemical reaction between the flue gas and the solution is accelerated by the catalytic packing.

[0090] Optionally, as Figures 2 to 6 shown, a plurality of partitions 4 are provided on the upper surface of the treatment plate 3, and a plurality of mutually separated chambers 5 are formed above the treatment plate 3 through the partitions 4.

[0091] Specifically, in this embodiment, to enable a water film with a uniform thickness to be formed on the upper surface of the treatment plate 3, the treatment plate 3 needs to be horizontal. Since the diameter of the flue gas treatment tower is relatively large, the treatment plate 3 often also has a relatively large diameter, and it is difficult to ensure the levelness of the treatment plate 3 with a relatively large diameter during installation. When the treatment plate 3 is a flat plate-like structure and several treatment plates 3 are in an inclined state, the water film thickness at the higher end of the treatment plate 3 will be relatively thin or there will be no water film, resulting in the flue gas not being treated, while the water film thickness at the lower end will be relatively large, making it difficult for the flue gas to pass through smoothly.

[0092] For this reason, in this embodiment, a plurality of partitions 4 are provided on the upper surface of the treatment plate 3, and a plurality of mutually separated chambers 5 are formed above the treatment plate 3 through the partitions 4. Even if the treatment plate 3 is in an inclined state after installation, since a plurality of chambers 5 are formed through the partitions 4, the solution on the treatment plate 3 will not flow directly from the higher side to the lower side, but rather ensure that a water film with a certain thickness can be formed in each chamber 5.

[0093] In addition, in this embodiment, after adding the partitions 4 to the treatment plate 3, the structural strength and bending resistance of the entire treatment plate 3 are increased, and even if the diameter of the treatment plate 3 is relatively large, it is not easy to generate bending deformation.

[0094] In one embodiment, as Figures 2 to 6 shown ( Figure 4 the longitudinal plates 41 in the partition 4 are omitted in

[0095] ), the partition 4 can be a plate-like structure with a crisscross pattern, including a plurality of cross plates 40 and longitudinal plates 41. The cross plates 40 and longitudinal plates 41 are welded and fixed to the upper surface of the treatment plate 3, and the upper surface of the treatment plate 3 is divided into a plurality of regions through the cross plates 40 and longitudinal plates 41, and each region forms an independent chamber 5. The regions located at the edge can use a circular plate added to the edge of the treatment plate 3 as the closed edge of this region, or the inner wall of the support structure 2 or the flue gas treatment tower can be used as the closed edge of this region. Figure 7As shown, in one embodiment, a first folding portion 400 may be provided at the upper end of all the horizontal plates 40, and a second folding portion 410 may be provided at the upper end of the vertical plate 41. The first folding portion 400 and the second folding portion 410 are attached and fixedly connected. Both the first folding portion 400 and the second folding portion 410 may be plate-like structures extending in the horizontal direction.

[0096] In another embodiment, when a first flipping portion 400 is provided at the upper end of some of the horizontal plates 40, since the vertical plate 41 is located between two adjacent horizontal plates 40, in order to enable the second folding portion 410 on each vertical plate 41 to have a corresponding connected first folding portion 400, a first folding portion 400 may be provided at the upper end of one of the two adjacent horizontal plates 40. In addition, the side elevation of the vertical plate 41 can also be welded and fixed to the inner side of the horizontal plate 40, thereby further improving the connection strength.

[0097] In one embodiment, the processing plate 3 is a circular plate. In another embodiment, the processing plate 3 may be multiple sector plates, and when installing, multiple sector plates need to be spliced to form a circular plate for easy installation in the flue gas treatment tower.

[0098] In one embodiment, as Figure 2 and Figure 6 shown, the processing plate 3 includes multiple individual plates 31, and a plurality of through holes 30 are provided on each plate 31. The plates 31 are fixedly arranged on the support structure 2.

[0099] When the overall diameter of the processing plate 3 is relatively large, for the convenience of transportation and installation of the processing plate 3, in this embodiment, the processing plate 3 is divided into multiple individual plates 31. During transportation, the multiple plates 31 can be stacked to reduce the occupied space. During installation, each plate 31 is fixedly attached to the support structure 2 one by one according to the corresponding division method, and finally the processing plate 3 and the processor are assembled. The plates 31 and the support structure 2 can be fixedly connected by welding or by bolts, etc., and this embodiment does not limit it here.

[0100] According to different division methods, plates 31 with different numbers and shapes will be formed. In one embodiment, the processing plate 3 is a circular plate as a whole, as Figure 2 and Figure 6 shown, by longitudinally and horizontally dividing the processing plate 3, a plurality of rectangular plates 311 and special-shaped plates 310 with arc-shaped edges can be obtained. The special-shaped plates 310 correspond to the edge regions of the processing plate 3. On this basis, the division spacing also determines the size of each plate 31, so the corresponding division method can be selected according to the actual situation.

[0101] In another embodiment, the processing plate 3 includes a plurality of sector plates that can be spliced into a circle. For example, the processing plate 3 includes two semi-circular plates. Similarly, longitudinally dividing and transversely dividing a single processing plate 3 can obtain a plurality of rectangular plates 311 and special-shaped plates 310 with arc-shaped edges. The special-shaped plates 310 correspond to the edge regions of the processing plate 3.

[0102] After the processing plate 3 is divided into a plurality of plate bodies, in order to enable the processing plate 3 to form a plurality of chambers 5 through the longitudinal plates 41 and the transverse plates 40 after assembly, in this embodiment, a transverse plate 40 is respectively arranged on two opposite sides of the rectangular plate 311. The transverse plates 40 between adjacent rectangular plates 311 are mutually attached and fixedly connected, and longitudinal plates 41 are arranged in the middle of each rectangular plate 311.

[0103] Specifically, the transverse plate 40 in this embodiment is a plate-like structure arranged in a single direction. For the rectangular plate 311, the transverse plate 40 is only arranged on two opposite sides of the rectangular plate 311 (for example, on the opposite long sides or short sides of the rectangular plate 31). When the rectangular plate 311 is arranged on the support structure 2 along the direction of the other pair of sides, the transverse plates 40 between adjacent rectangular plates 311 are mutually attached, and the rectangular plate 311 can be welded or fixed to the support structure 2 by bolts, and at the same time, the adjacent transverse plates 40 are welded or fixed by bolts.

[0104] In one embodiment, as Figure 8 shown, the height of the transverse plate 40 on one long side of the rectangular plate 311 is less than the height of the transverse plate 40 on the other side. While facilitating the welding and fixing of two adjacent transverse plates 40, the material used for the transverse plate 40 is reduced, thereby reducing the use cost. In this embodiment, since the height of the transverse plate 40 on one side of the rectangular plate 311 is small and cannot provide a first folding portion 400 for connecting with the second folding portion 410 on the longitudinal plate 41, for a rectangular plate 311, the first folding portion 400 can be selected to be arranged on the transverse plate 40 with a higher height on the rectangular plate 311.

[0105] When two rectangular plates 311 are assembled, as Figure 7 shown, the higher transverse plate 40 on one rectangular plate 311 is attached to the lower transverse plate 40 on the other rectangular plate 311. Therefore, after assembly, for the same rectangular plate 311, both sides of the rectangular plate 311 have higher transverse plates 40, and the higher transverse plates 40 can be provided with first folding portions 400. Therefore, both ends of the second folding portion 410 on the longitudinal plate 41 arranged on the rectangular plate 311 can be fixedly connected to the corresponding first folding portions.

[0106] In one embodiment, as Figure 4As shown, the support structure 2 includes crisscrossed support beams 202, and each rectangular plate 311 and special-shaped plate 310 are fixed on the support beams 202.

[0107] Specifically, in this embodiment, the support beams 202 are arranged crisscrossed to provide stable support for the processing plate 3. Since the processing plate 3 is provided with multiple ones, the support beams 202 are also provided with multiple groups, and each group of support beams 202 is used to support one processing plate 3. Connecting members such as diagonal braces 203 can be used to connect between the upper and lower two groups of support beams 202 to ensure the structural stability of the entire support structure 2.

[0108] When the processing plate 3 is divided into multiple plate bodies, in order to provide fixed positions for each plate body, in this embodiment, the positions of the support beams 202 correspond to the division positions of the processing plate 3, that is, correspond to the edge positions of the plate bodies, and at least one pair of opposite edges on the plate body can be fixed on the corresponding support beams 202.

[0109] In one implementation manner, the support structure 2 further includes an enclosing plate 204, and the support beams 202 are fixed inside the enclosing plate 204.

[0110] Specifically, the enclosing plate 204 surrounds the outside of the entire support beam 202 and the processing plate 3, and the support beam 202 and the processing plate 3 are both installed inside the enclosing plate 204. The enclosing plate 204 can be fixedly connected to the inside of the flue gas treatment tower, and the entire processor is installed inside the flue gas treatment tower through the enclosing plate 204.

[0111] In one specific implementation manner, for the convenience of transportation, the support structure 2 is provided as two semi-circular parts, which can be installed inside the flue gas treatment tower on site to form a circular structure. Correspondingly, in a single part of the support structure 2, the enclosing plate 204 includes a semi-circular plate and a straight plate. The two ends of the straight plate are fixedly connected to the two ends of the semi-circular plate to form a semi-circular frame, and the support beams 202 are fixed inside the frame and fixedly connected to the corresponding semi-circular plate and straight plate. In this implementation manner, when dividing the circular processing plate 3, the circular processing plate 3 is preferably divided into two semi-circular plates first, and then the two semi-circular plates are divided.

[0112] On the basis of providing a catalytic coating on the processing plate 3, the processing plate 3 can also be made of a material with catalytic effect to accelerate the chemical reaction between the flue gas and the solution.

[0113] For large flue gas treatment towers, it is necessary to configure flue gas processors with larger diameters, and the installation and transportation of large-diameter flue gas processors are both relatively difficult.

[0114] For this reason, on the basis of the above implementation manner, as Figure 2 and Figure 3 shown, this implementation manner provides a processor for flue gas treatment, including:

[0115] The processor includes a plurality of processing units 1, the processing units 1 are fan-shaped, and the plurality of processing units 1 can be assembled circumferentially within a cylindrical space;

[0116] The processing unit 1 includes a support structure 2 and a processing plate 3, and the support structure 2 is arranged to allow the solution to flow through;

[0117] A plurality of through holes 30 are provided on the processing plate 3, and the aperture and density of the through holes 30 satisfy that the sum of the solution flow rates allowed to pass through the plurality of through holes 30 per unit time is less than the solution flow rate flowing to the processing plate 3 where the through holes 30 are located per unit time.

[0118] In this embodiment, the processor is set as a plurality of split processing units 1, each processing unit 1 is fan-shaped, and the plurality of fan-shaped processing units 1 can be installed within a cylindrical space after being arranged circumferentially, that is, they can be installed in a flue gas treatment tower. According to different layout methods, the plurality of processing units 1 can be closely attached or arranged at intervals. To make full use of the space, it is preferably that the plurality of processing units 1 are closely attached to each other. Each processing unit 1 includes a support structure 2 and a processing plate 3. The support structure 2 and the processing plate 3 in this embodiment have the same functions as the support structure 2 and the processing plate 3 in the above-mentioned embodiment, and will not be elaborated here. In one embodiment, the support structure 2 is set as a fan-shaped frame structure, and the processing plate 3 in a single processing unit 1 can be set as one or more. When it is set as one, the processing plate 3 is set as fan-shaped and installed on the support structure 2.

[0119] This embodiment achieves the purpose of setting the processor as a plurality of split processing units 1. During transportation, the processing units 1 can be placed separately, and after arriving at the site, the plurality of processing units 1 can be installed in the flue gas treatment tower one by one. Since the processing units 1 are fan-shaped, when installed, the processing units 1 can be installed circumferentially in a certain order to form a circular processor, enabling it to adapt to the cylindrical flue gas treatment tower, thus achieving the technical effect of reducing the space requirement for a large processor during transportation and at the same time reducing the installation difficulty during installation, and further solving the problem of inconvenient installation and transportation of large-diameter flue gas processors in the related art.

[0120] In one embodiment, as Figure 4 shown, the support structure 2 includes an enclosing plate 204 and support beams 202. The enclosing plate 204 encloses a fan-shaped space, and a plurality of support beams 202 are arranged in the fan-shaped space. The support beams 202 are fixedly connected to the enclosing plate 204;

[0121] The processing plate 3 is arranged in the fan-shaped space and fixedly connected to the support beams 202.

[0122] Specifically, in this embodiment, the processing board 3 can be a sector plate matching the sector space, or it can be composed of multiple plates 31 installed in the sector space. The edge of the processing board 3 fits against the inner side of the surrounding board 204, and the surrounding board 204 is used as the retaining structure for the water film on the processing board 3.

[0123] When the surrounding board 204 encloses a sector space, as Figure 4 shown, the surrounding board 204 includes a first plate body 2040 and a second plate body 2041. In this embodiment, the surrounding board 204 has at least two forms. One form is that the sector space enclosed by the surrounding board 204 is semi-circular, and the other form is that the sector space enclosed by the surrounding board 204 is a non-semi-circular sector. Correspondingly, when the sector space enclosed by the surrounding board 204 is semi-circular, the first plate body 2040 is a semi-circular arc plate, the second plate body 2041 is a straight plate, and the two ends of the second plate body 2041 are fixedly connected to the two ends of the arc plate.

[0124] When the sector space enclosed by the surrounding board 204 is other sectors, the first plate body 2040 is a non-semi-circular arc plate, the second plate body 2041 is a V-shaped plate, and the two ends of the second plate body 2041 are fixedly connected to the two ends of the arc plate.

[0125] Both ends of the support beam 202 are fixedly connected to the corresponding first plate body 2040 and second plate body 2041, and the fixing method can be welding or bolt connection.

[0126] When adjacent processing units 1 are closely attached to each other, the second plate bodies 2041 in adjacent surrounding boards 204 are closely attached, and the two ends of the first plate bodies 2040 in adjacent surrounding boards 204 are closely attached to form a circle.

[0127] In one embodiment, as Figure 4 shown, two support structures 2 are provided and symmetrically distributed. The corresponding surrounding board 204 encloses a semi-circular space, the first plate body 2040 is a semi-circular arc plate, the second plate body 2041 is a straight plate, and the second plate bodies 2041 in the two support structures 2 are closely attached.

[0128] Furthermore, as Figure 4 shown, multiple support beams 202 are criss-crossed, and both ends of the support beam 202 are fixedly connected to the surrounding board 204; the processing board 3 is fixedly arranged on the upper end surface of the support beam 202.

[0129] At least one of the plurality of support beams 202 is in contact with the inner side of the second plate body 2041; for facilitating the support of the arc-shaped edge of the processing plate 3, in this embodiment, the support structure 2 further includes an arc-shaped support plate 201, which is fixedly arranged on the inner side of the surrounding plate 204 and is in contact with the inner side of the first plate body 2040. The arc-shaped edge of the processing plate 3 is supported by the arc-shaped support plate 201, and the linear edge of the processing plate 3 is supported by the support beam 202.

[0130] When the processing plates 3 are arranged in two groups in the up-and-down distribution, the support beams 202 are arranged in two groups and are distributed up and down in the fan-shaped space. Each group of support beams 202 is provided with a plurality of them and is arranged vertically and horizontally; the upper ends of each group of support beams 202 are fixedly provided with the processing plate 3.

[0131] To further improve the support performance, the support structure 2 further includes diagonal braces 203. The diagonal braces 203 are provided in a plurality and are located between the two groups of support beams 202. The upper and lower ends of the diagonal braces 203 are respectively fixedly connected to the corresponding support beams 202.

[0132] In one embodiment, as Figure 1 shown, the waste liquid treatment subsystem 15 includes:

[0133] A water treatment module 150, which is used to receive the waste liquid discharged from the liquid storage area 10 and purify the waste liquid. The treated clean water is returned to the flue gas treatment tower 6, and the treated salt-containing concentrated water is transported to the next level;

[0134] A buffer tank 151, which is connected to the water treatment module 150 and is used to receive the treated salt-containing concentrated water and transport the salt-containing concentrated water to the next level respectively;

[0135] A decomposition furnace 153, which is connected to the buffer tank 151 and is used to receive the separated salt-containing concentrated water and recycle it;

[0136] A grate cooler 152, which is connected to the buffer tank 151 and is used to receive the salt-containing concentrated water of part of the buffer tank and recycle it.

[0137] In this embodiment, the water treatment module 150 is connected to the liquid storage area 10 through a water pump. The waste liquid in the liquid storage area 10 is pumped into the water treatment module 150 through the water pump, and the waste liquid is treated by the water treatment module 150. The treatment process may include purifying the waste liquid. The treated clean water can be transported back to the liquid storage area 10 as a solvent for the treatment agent through the water pump, and the treated salt-containing concentrated water is transported into the buffer tank 151. The salt-containing concentrated water includes solid fine particle impurities, water-soluble salt substances and water-insoluble salt substances. Therefore, the salt-containing concentrated water needs to be further treated.

[0138] Specifically, after the flue gas is treated, the resulting salt-containing solution contains ammonium salts, ammonium sulfate, nitrogen oxides, etc. Therefore, the concentrated salt water can be transported to the decomposition furnace 153 for high-temperature treatment. In a high-temperature environment, ammonium sulfate decomposes into sulfate radicals and ammonia. Among them, the sulfate radicals react with calcium oxide, an alkaline mineral decomposed from calcium carbonate in the decomposition furnace 153, to form calcium sulfate, which enters the kiln with the raw meal. The ammonia decomposed from the ammonium salts undergoes a redox reaction with nitrogen oxides to generate nitrogen gas, which can be used for denitrification to save ammonia water. Finally, in this embodiment, calcium sulfate, nitrogen gas, and ammonia water are obtained after treating the concentrated salt water. In addition, the concentrated salt water can also be directly introduced into the grate cooler 152 for treatment, for example, introduced into the high-temperature section of the grate cooler 152 for treatment and recycling. The treatment includes decomposing the ammonia from the ammonium salts and entering the kiln and furnace with the secondary and tertiary air for direct denitrification to save ammonia water. The sulfate radicals decomposed from the ammonium salts react with calcium oxide, an alkaline mineral on the surface of the clinker, to form stable calcium salts, which are stored in the warehouse with the clinker.

[0139] In this embodiment, the flue gas is subjected to ammonia removal and desulfurization treatment by the flue gas treatment tower 6. The ammonia water obtained after ammonia removal can be further used for denitrification treatment, so that multiple substances can be treated in one treatment process, further improving the treatment efficiency, and fully recycling the beneficial substances after the flue gas treatment. In addition, it should be noted that in the present invention, oxygen is input into the flue gas treatment tower 6 through the oxygen input subsystem 12, so that sulfur dioxide in the flue gas treatment tower 6 can be converted into sulfur trioxide, which can form ammonium sulfate after dissolving in water, facilitating the subsequent formation of calcium sulfate.

[0140] In one implementation manner, as Figure 1 shown, the oxygen input subsystem 12 includes an oxidation blower 120. An oxygen inlet 601 is provided on the flue gas treatment tower 6. The oxygen inlet 601 is located below the flue gas inlet 602. The oxidation blower 120 is connected to the oxygen inlet 601 and is used to input oxygen from the oxygen inlet 601 into the flue gas treatment tower 6 to promote the chemical reaction of sulfur-containing substances in the flue gas treatment tower 6. According to actual needs, multiple oxidation blowers 120 can be provided.

[0141] In one implementation manner, since it is necessary to detect the absorbent in the liquid storage area 10 in real time during the flue gas treatment process, including but not limited to detecting the composition and pH value of the absorbent. For this reason, the flue gas ammonia removal treatment system in this embodiment further includes an absorption area pit subsystem 16. The absorption area pit subsystem 16 is connected to the liquid storage area 10 and is used to extract the absorbent that has participated in the flue gas treatment from the liquid storage area 10 and transport the extracted absorbent back to the liquid storage area 10, and detect the absorbent that has participated in the flue gas treatment through the absorption area pit subsystem 16.

[0142] Specifically, in this embodiment, the sump subsystem 16 of the absorption zone includes a sump in the absorption zone and a corresponding sump pump. The liquid in the liquid storage area 10 is continuously pumped into the sump in the absorption zone by the sump pump, and the liquid in the sump in the absorption zone is detected by corresponding detection equipment. At the same time, the liquid in the sump in the absorption zone also needs to be continuously transported back to the liquid storage area 10 for use as an absorbent. Therefore, the liquid in the sump in the absorption zone is in a continuous flow state, and its state is basically the same as that of the liquid in the liquid storage area 10. By detecting the liquid in the sump in the absorption zone, the state of the liquid in the liquid storage area 10 can be judged.

[0143] In one embodiment, processes such as the replenishment of treatment chemicals, the replenishment of aqueous solutions, and the extraction of waste liquid can be judged by the state of the liquid in the sump in the absorption zone.

[0144] In one embodiment, to facilitate the maintenance and cleaning of the flue gas treatment tower 6, it is necessary to drain the absorbent in the liquid storage area 10. For this purpose, in this embodiment, an absorbent buffer system 17 is further included. The absorbent buffer system 17 is used to buffer the absorbent in the liquid storage area 10 and transport the buffered absorbent back to the liquid storage area 10.

[0145] Specifically, the absorbent buffer system 17 may include an absorbent buffer tank 151. Its input end can be connected in parallel to the output end of the sump subsystem 16 of the absorption zone, and its output end is connected to the liquid storage area 10 through an absorbent return pump. The absorbent buffer tank 151 buffers the absorbent in the liquid storage area 10, which is convenient for the maintenance and cleaning of the flue gas treatment tower 6. In subsequent processing, the absorbent is transported back to the liquid storage area 10 through the absorbent return pump.

[0146] In one embodiment, as Figure 1 shown, the chemical agent delivery subsystem 18 includes: an alkaline chemical agent delivery component 180 for inputting alkaline chemical agents into the liquid storage area 10; an acidic chemical agent delivery component 181 for inputting acidic chemical agents into the liquid storage area 10.

[0147] In one embodiment, to improve the treatment effect of flue gas, it is desired that the flue gas in each area of the flue gas treatment tower 6 can come into contact with the absorbent sprayed by the spraying component 8, so as to treat the flue gas with the absorbent. In addition, in the core processor 7 part, it is necessary to rely on the absorbent sprayed by the spraying component 8 to form a water film. To enable the flue gas to come into full contact with the absorbent, the surface of the core processor 7 should be completely covered by the water film, so that all the flue gas passing through the core processor 7 needs to pass through the water film.

[0148] Therefore, the spraying range of the spraying assembly 8 needs to cover the core processor 7, so as to form a complete water film on the core processor 7. Even after the processing board of the core processor 7 is partitioned, a water film can still be formed in each area, ensuring sufficient contact between the flue gas and the absorbent.

[0149] Specifically, in this embodiment, the spraying assembly 8 includes a first spray head 801, a second spray head 802, and a third spray head 803 arranged in sequence from top to bottom. The spraying ranges of the first spray head 801, the second spray head 802, and the third spray head 803 intersect and jointly cover the core processor 7. In this embodiment, each spray head includes a plurality of nozzles, and the ranges of each nozzle intersect, so as to avoid the generation of unsprayed areas. The first spray head 801, the second spray head 802, and the third spray head 803 are staggered by a certain angle in the circumferential direction to ensure full coverage.

[0150] Correspondingly, after the first spray head 801, the second spray head 802, and the third spray head 803 are set, the absorbent circulation subsystem 11 includes a first circulation pump 110, a second circulation pump 111, and a third circulation pump 112. The two ends of the first circulation pump 110 are respectively connected to the liquid storage area 10 and the first spray head 801, the two ends of the second circulation pump 111 are respectively connected to the liquid storage area 10 and the second spray head 802, and the two ends of the third circulation pump 112 are respectively connected to the liquid storage area 10 and the third spray head 803.

[0151] In the present invention, although the flue gas carrying droplets has undergone gas-liquid separation through the demisting assembly 9, there will still be some tiny droplets in the separated flue gas, and these tiny droplets also need to be processed. For this reason, as Figure 1 shown, this embodiment further includes a smoke collection subsystem 19. The smoke collection subsystem 19 is arranged at the upper part of the flue gas treatment tower 6 and is communicated with the flue gas outlet 603. The smoke collection subsystem 19 is used to collect the gas containing droplets after the flue gas is treated, and perform gas-liquid separation on the gas containing droplets. The separated gas is discharged from the flue gas outlet 603.

[0152] Specifically, the smoke collection subsystem 19 can adopt different structures according to different gas-liquid separation methods. For example, a special gas-liquid separation device is connected to the upper end of the flue gas treatment tower to perform gas-liquid separation on the flue gas. In another embodiment, the rotation of the flue gas is caused by the rising speed of the flue gas to contact the wall on the path for gas-liquid separation. In still another embodiment, the flow path of the flue gas is increased and the path is bent in multiple ways to achieve gas-liquid separation.

[0153] To reduce costs, the flow rate of the flue gas is reasonably utilized for gas-liquid separation, and the resistance of the flue gas during gas-liquid separation is reduced to ensure sufficient treatment efficiency. As Figure 1 and Figure 9As shown in the figure, in this embodiment, a smoke exhaust duct for flue gas treatment is provided as the above-mentioned smoke collection subsystem, which includes a smoke collection hood 190 and an exhaust pipe 193. The smoke collection hood 190 can be set to a conical shape. A first ventilation port 194 is provided at the upper end of the smoke collection hood 190. The lower end of the exhaust pipe 193 is connected to the first ventilation port 194, and the exhaust pipe 193 is communicated with the flue gas outlet 603.

[0154] A second ventilation port 191 is provided on the smoke collection hood 190, and a third ventilation port 192 is provided on the exhaust pipe 193. The second ventilation port 191 and the third ventilation port 192 are communicated through a pipeline. The orientation of the third ventilation port 192 deviates from the axis of the exhaust pipe 193, so that the gas discharged from the third ventilation port 192 enters the exhaust pipe 193 from the tangential direction of the exhaust pipe 193, making the gas in the exhaust pipe 193 rise in a cyclone and achieve gas-liquid separation.

[0155] Specifically, as Figure 9 shown, in this embodiment, the conical smoke collection hood 190 can collect the treated flue gas and collect the flue gas into the exhaust pipe 193 through the first ventilation port 194. The first ventilation port 194 can be located in the middle of the smoke collection hood 190. The diameter of the exhaust pipe 193 is much smaller than the inner diameters of the smoke collection hood 190 and the flue gas treatment tower 6. Therefore, the flow rate of the flue gas further increases when it enters the exhaust pipe 193. In this embodiment, in order to make the flue gas entering the exhaust pipe 193 rotate and make the liquid droplets in the flue gas contact the wall of the exhaust pipe 193 to achieve gas-liquid separation, a second ventilation port 191 is eccentrically provided on the smoke collection hood 190, and a third ventilation port 192 is provided on the exhaust pipe 193. The second ventilation port 191 and the third ventilation port 192 are kept communicated through a pipeline. In order to make the flue gas in the exhaust pipe 193 rotate, a tangential force needs to be provided for the flue gas. Therefore, in this embodiment, the third ventilation port 192 does not directly face the middle of the exhaust pipe 193, but deviates from the axis of the exhaust pipe 193, making it face the left or right side of the exhaust pipe 193, so that the flue gas entering the exhaust pipe 193 from the third ventilation port 192 can provide a tangential force for the flue gas in the exhaust pipe 193, making the flue gas in the exhaust pipe 193 rotate and rise to achieve gas-liquid separation.

[0156] In this embodiment, the flue gas treated in the flue gas treatment tower 6 is divided into two paths from the smoke collecting hood 190. The first path, as the main path, enters the exhaust pipe 193 through the first ventilation port 194 and flows upward. The second path enters the exhaust pipe 193 tangentially from the exhaust pipe 193 through the second ventilation port 191, the pipeline and the third ventilation port 192. The velocity of the flue gas itself is used to provide a tangential thrust to the flue gas in the exhaust pipe 193, so that the flue gas in the exhaust pipe 193 spirally rises as a whole. During the spiral rising process, the tiny droplets carried by the flue gas contact the inner wall of the exhaust pipe 193 and adhere to the inner wall. On the one hand, it realizes the further gas-liquid separation of the treated flue gas and reduces the content of tiny droplets in the flue gas, thus solving the problem that the flue gas discharged from the flue gas treatment tower 6 in the related art still carries a large amount of tiny droplets. On the other hand, it makes full use of the velocity of the flue gas itself to form a spiral upward flowing gas flow in the exhaust pipe 193, without introducing additional air induction equipment, and reduces the cost of flue gas treatment.

[0157] On this basis, to further facilitate the rotation of the flue gas in the exhaust pipe 193, as Figure 9 shown, the second ventilation port 191 is provided with a plurality of them and is circumferentially distributed along the first ventilation port 194. The third ventilation port 192 is provided with a plurality of them and is circumferentially distributed along the exhaust pipe 193, and the orientations of the plurality of third ventilation ports 192 are all in the clockwise direction or the counterclockwise direction; the plurality of second ventilation ports 191 are respectively connected to the plurality of third ventilation ports 192 through pipelines.

[0158] In this embodiment, the orientations of all the third ventilation ports 192 are all in the clockwise direction or the counterclockwise direction. A plurality of tangential thrusts are provided for the flue gas in the exhaust pipe through the plurality of third ventilation ports, so that the flue gas in the exhaust pipe can rotate better. In a specific implementation manner, the second ventilation port 191 is provided with two and is located on opposite sides of the smoke collecting hood 190. Correspondingly, the third ventilation port 192 is also provided with two and is located on both sides of the exhaust pipe 193. Larger and more stable tangential forces are provided for the flue gas in the exhaust pipe 193 through the two third ventilation ports 192, ensuring the stable rotation of the flue gas in the exhaust pipe 193. At the same time, it also ensures that a sufficient amount of flue gas enters the flue gas in the exhaust pipe from the first ventilation port 194, improving the flue gas treatment efficiency.

[0159] When a plurality of second ventilation ports 191 and a plurality of third ventilation ports 192 are provided, the plurality of second ventilation ports 191 can be circumferentially and evenly distributed on the air collecting hood, and the plurality of third ventilation ports 192 are distributed along the spiral direction on the exhaust pipe 193, so as to better push the flue gas in the exhaust pipe 193 to spiral upward.

[0160] Specifically, when there are two second ventilation openings 191 and two third ventilation openings 192, the two second ventilation openings 191 can be symmetrically distributed on the air collecting hood, and the two third ventilation openings 192 are respectively located on both sides of the exhaust pipe 193 and are vertically distributed, so as to better promote the spiral upward movement of the flue gas in the exhaust pipe 193.

[0161] To facilitate the rotation of the flue gas, the exhaust pipe 193 is set as a circular pipe, and the third ventilation opening 192 needs to face the tangential direction of the exhaust pipe 193. To provide sufficient tangential force, the third ventilation opening 192 needs to have a sufficient diameter, and its orientation needs to be as close as possible to the edge of the exhaust pipe 193, that is, sufficiently deviated from the axis of the exhaust pipe 193. When the third ventilation opening 192 is a circular opening, the diameter of the third ventilation opening 192 is limited, resulting in insufficient tangential force. Therefore, as Figure 9 shown, in this embodiment, the third ventilation opening 192 is set as a square opening, so as to provide a large outlet area while being as close as possible to the edge of the exhaust pipe 193, thereby being able to provide sufficient tangential force, providing the rotational stability and rotational speed of the flue gas in the exhaust pipe 193, and finally providing the gas-liquid separation effect.

[0162] After the third ventilation opening 192 is set as a square opening, it belongs to a special-shaped structure for conventional pipeline connection. Therefore, a special-shaped interface needs to be welded separately by a steel plate. The first end of the interface matches the third ventilation opening 192, and the second end is still a circular opening for connecting with the pipeline. To ensure the structural strength of the interface, strengthening structures such as reinforcing ribs can be welded on each steel plate forming the interface.

[0163] On this basis, as Figure 9 shown, the upper boundary of the third ventilation opening 192 is a spiral shape extending around the wall of the exhaust pipe 193, so as to further facilitate the formation of a spiral upward airflow in the exhaust pipe 193. Further, the lower boundary of the third ventilation opening 192 is also a spiral shape extending around the wall of the exhaust pipe 193, and the height difference between the starting point and the ending point of the lower boundary is less than the height difference between the starting point and the ending point of the upper boundary. The connection line between the starting point of the upper boundary and the starting point of the lower boundary is a straight line, and the connection line between the ending point of the upper boundary and the ending point of the lower boundary is a straight line, that is, the side boundaries on both sides of the third ventilation opening are straight lines.

[0164] Based on the flue gas denitrification system in the above embodiment, this embodiment provides a flue gas denitrification process, including:

[0165] S10. Introduce the flue gas into the flue gas treatment tower 6, and make the flue gas flow upward in the flue gas treatment tower 6;

[0166] S20. Introduce oxygen into the flue gas treatment tower 6 through the oxygen input subsystem 12 to promote the oxidation reaction of the substances containing sub-valent sulfur in the flue gas treatment tower 6;

[0167] S30. Input the treatment agent into the flue gas treatment tower 6 and mix it with the aqueous solution in the liquid storage area 10 to form an absorbent;

[0168] S40. Through the absorbent circulation subsystem 11, transport the absorbent in the lower liquid storage area 10 of the flue gas treatment tower 6 to the upper spray assembly 8, and spray the absorbent downward by the spray assembly 8;

[0169] S50. By controlling the flow rate of the spray assembly 8, when the absorbent passes through the core processor 7 located below the spray assembly 8, multiple water films are formed in the core processor 7, so that the upward flowing flue gas passes through the core processor 7 while passing through multiple water films and reacts with the absorbent. The ammonia in the flue gas is absorbed by the absorbent to form salt substances and then returns to the liquid storage area 10;

[0170] S60. The flue gas passing through the water film is demisted by the demisting assembly 9 located above the spray assembly 8, and the demisted flue gas is discharged from the flue gas outlet 603 of the flue gas treatment tower 6;

[0171] S70. When the concentration of the salt substances in the liquid storage area 10 exceeds the set value, the waste liquid in the liquid storage area 10 is transported to the waste liquid treatment subsystem 15, and the salt substances in the waste liquid are recycled by the waste liquid treatment subsystem 15.

[0172] In the specific implementation process, first execute S30 - S50 to stably form multiple water films in the core processor 7. Then execute S10, S20, S40, S50, S60 and S60 to continuously treat the flue gas. During the treatment process, S30 is selected according to the content of the treatment agent in the liquid storage area 10. Step S30 includes inputting the alkaline agent into the liquid storage area 10 through the alkaline agent delivery assembly 180, inputting the acidic agent into the liquid storage area 10 through the acidic agent delivery assembly 181, and inputting the aqueous solution in the water tank into the liquid storage area 10 through the water pump.

[0173] Further, at least two treatment plates 3 are arranged in the core processor 7, and the two treatment plates 3 are distributed along the axial direction of the flue gas treatment tower 6;

[0174] By controlling the flow rate of the spray assembly 8, when the absorbent passes through the two treatment plates 3 located below the spray assembly 8, water films are formed on the surfaces of the two treatment plates 3. The flue gas passes through the water film on the lower treatment plate 3 and the water film on the upper treatment plate 3 in sequence, so that the flue gas and the absorbent undergo two full absorption reactions in the core processor 7, thereby improving the effect of flue gas treatment and avoiding excessive resistance to the flue gas.

[0175] Further, the waste liquid in the liquid storage area 10 is transported to the waste liquid treatment subsystem 15, and the salt substances in the waste liquid are recycled by the waste liquid treatment subsystem 15, including:

[0176] The waste liquid in the liquid storage area 10 is transported to the water treatment module 150, and the waste liquid is purified by the water treatment module 150. The treated purified water is returned to the flue gas treatment tower 6 to obtain the treated concentrated salt water.

[0177] The concentrated salt water is transported to the buffer tank 151 for buffering.

[0178] The concentrated salt water in the buffer tank 151 is transported to the decomposition furnace 153 for recycling; and / or,

[0179] The concentrated salt water in the buffer tank 151 is transported to the grate cooler 152 for recycling.

[0180] Further, transporting the concentrated salt water in the buffer tank 151 to the decomposition furnace 153 for recycling includes:

[0181] The concentrated salt water is transported to the decomposition furnace 153. In a high-temperature environment, ammonium sulfate in the concentrated salt water is decomposed into sulfate and ammonia. The sulfate reacts with calcium oxide decomposed from calcium carbonate (limestone) in the decomposition furnace 153 to form calcium sulfate, and the ammonia reacts with nitrogen oxides in the furnace for denitrification, thereby achieving the purpose of saving ammonia water.

[0182] Further, transporting the concentrated salt water in the buffer tank 151 to the grate cooler 152 for recycling includes:

[0183] The concentrated salt water is transported to the high-temperature section of the grate cooler 152. In a high-temperature environment, ammonium sulfate in the concentrated salt water is decomposed into sulfate and ammonia. The sulfate reacts with calcium oxide on the surface of the clinker in the grate cooler 152 to form calcium sulfate;

[0184] The ammonia then enters the kiln and furnace with the secondary and tertiary air for denitrification, also achieving the saving of ammonia water.

[0185] Specifically, in one embodiment, the above flue gas deammoniation process can be used in conjunction with the decomposition furnace and the grate cooler during the cement production process. It should be noted that the decomposition furnace is the place where limestone (mainly calcium carbonate) in the cement raw meal decomposes. The decomposition products are calcium oxide (CaO) and CO2. CaO enters the kiln through the five-stage cyclone and undergoes high-temperature reactions to form cement clinker, while CO2 rises with the flue gas and is discharged outside. In addition, cement clinker is alkaline, with a CaO content of about 64%. Therefore, it will naturally react with sulfate to form calcium sulfate when encountering sulfate. When cooperating with the grate cooler, the front end of the grate cooler is the high-temperature section. The cooling air in this section (which becomes high-temperature air at about 1100°C after cooling the clinker) is used as the combustion air for the kiln and the decomposition furnace. The air entering the kiln is called secondary air, and the air entering the decomposition furnace is called tertiary air. The so-called primary air is the air used to send coal to the burner at the kiln head and usually comes from the atmosphere.

[0186] Further, a smoke collection subsystem 19 is provided at the top of the flue gas treatment tower 6. The smoke collection subsystem 19 adsorbs tiny droplets from the flue gas passing through the demisting component 9. The smoke collection subsystem 19 includes a smoke collection hood 190 and an exhaust pipe 193. The smoke collection hood 190 is set in a conical shape. A first ventilation port 194 is provided on the smoke collection hood 190. The first ventilation port 194 is connected to the exhaust pipe 193, and the exhaust pipe 193 is communicated with the flue gas outlet 603.

[0187] A second ventilation port 191 is provided on the smoke collection hood 190, and a third ventilation port 192 is provided on the exhaust pipe 193. The second ventilation port 191 and the third ventilation port 192 are connected by a pipe. The orientation of the third ventilation port 192 deviates from the axis of the exhaust pipe 193.

[0188] The flue gas is divided into two paths from the smoke collection hood 190. The first path enters the exhaust pipe 193 through the first ventilation port 194 and flows upward inside the exhaust pipe 193.

[0189] The second path enters the exhaust pipe 193 tangentially from the exhaust pipe 193 through the second ventilation port 191, the pipe, and the third ventilation port 192. The self-speed of the flue gas is used to provide a tangential thrust for the flue gas inside the exhaust pipe 193, making the flue gas spiral upward as a whole inside the exhaust pipe 193. During the spiral upward process, the tiny droplets carried by the flue gas come into contact with the inner wall of the exhaust pipe 193 and adhere to the inner wall.

[0190] Further, during the flue gas treatment process, a part of the liquid in the liquid storage area 10 is circulated between the liquid storage area 10 and the absorption area pit subsystem 16, and the absorption agent after participating in the flue gas treatment is detected through the absorption area pit subsystem 16.

[0191] Further, during the maintenance period, the absorption agent in the liquid storage area 10 is transported to the absorption agent buffer system 17 for buffering, and after the maintenance, the absorption agent in the absorption agent buffer system 17 is transported back to the liquid storage area 10.

[0192] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flue gas denitrification process, characterized in that, Including: Pass the flue gas into the flue gas treatment tower, and make the flue gas flow upward in the flue gas treatment tower; Pass oxygen into the flue gas treatment tower through the oxygen input subsystem to promote the oxidation reaction of substances containing sulfur in sub-valent state in the flue gas treatment tower; Input the treatment agent into the flue gas treatment tower and mix it with the aqueous solution in the liquid storage area to form an absorbent; Transport the absorbent in the lower liquid storage area of the flue gas treatment tower to the upper spray component through the absorbent circulation subsystem, and spray the absorbent downward by the spray component; By controlling the flow rate of the spray component, the absorbent forms multiple water films in the core processor while passing through the core processor located below the spray component, so that the upward-flowing flue gas passes through the core processor while passing through multiple water films and reacts with the absorbent. The absorbent absorbs ammonia in the flue gas and forms salt substances and returns to the liquid storage area; Perform demisting treatment on the flue gas passing through the water film through the demisting component located above the spray component, and the demisted flue gas is discharged from the flue gas outlet of the flue gas treatment tower; When the concentration of salt substances in the liquid storage area exceeds the set value, transport the waste liquid in the liquid storage area to the waste liquid treatment subsystem, and the waste liquid treatment subsystem recovers and utilizes the salt substances in the waste liquid.

2. The flue gas denitrification process according to claim 1, wherein Set at least two processing plates in the core processor, and the two processing plates are distributed along the axial direction of the flue gas treatment tower; By controlling the flow rate of the spray component, the absorbent forms water films on the surfaces of the two processing plates located below the spray component while passing through them. The flue gas passes through the water film on the lower processing plate and the water film on the upper processing plate in sequence, so that the flue gas and the absorbent undergo two full absorption reactions in the core processor.

3. The flue gas denitrification process according to claim 1, characterized in that Transport the waste liquid in the liquid storage area to the waste liquid treatment subsystem, and the waste liquid treatment subsystem recovers and utilizes the salt substances in the waste liquid, including: Transport the waste liquid in the liquid storage area to the water treatment module, and the water treatment module purifies the waste liquid. The treated purified water returns to the flue gas treatment tower to obtain treated concentrated salt water; Transport the concentrated salt water to the buffer tank for buffering; Transport the concentrated salt water in the buffer tank to the lime calcination decomposition furnace for recycling; and / or, Transport the concentrated salt water in the buffer tank to the grate cooler for recycling.

4. The flue gas denitrification process according to claim 3, wherein Transport the concentrated salt water in the buffer tank to the decomposition furnace for recycling, including: Transport the concentrated salt water to the decomposition furnace. Under high-temperature environment, decompose ammonium sulfate in the concentrated salt water into sulfate radical and ammonia. The sulfate radical reacts with calcium oxide decomposed from calcium carbonate in the decomposition furnace to form calcium sulfate, and ammonia reacts with nitrogen oxides in the furnace for denitrification.

5. The flue gas denitrification process according to claim 3, characterized in that, Transport the concentrated salt water in the buffer tank to the grate cooler for recycling, including: Transport the concentrated salt water to the high-temperature section of the grate cooler. Under high-temperature environment, decompose ammonium sulfate in the concentrated salt water into sulfate radical and ammonia. The sulfate radical reacts with calcium oxide on the surface of the clinker in the grate cooler to form calcium sulfate; Transport ammonia to the kiln and furnace with the secondary and tertiary air for denitrification.

6. The flue gas denitrification process according to claim 1, characterized in that, Set a smoke collection subsystem at the top of the flue gas treatment tower, and adsorb tiny droplets of the flue gas passing through the demisting component through the smoke collection subsystem.

7. The flue gas denitrification process according to claim 6, characterized in that, The smoke collection subsystem includes a smoke collection hood and an exhaust pipe. The smoke collection hood is configured as a cone. A first ventilation opening is provided on the smoke collection hood, and the first ventilation opening is connected to the exhaust pipe. The exhaust pipe is communicated with the flue gas outlet; A second ventilation opening is provided on the smoke collection hood, and a third ventilation opening is provided on the exhaust pipe. The second ventilation opening and the third ventilation opening are communicated through a pipe, and the orientation of the third ventilation opening deviates from the axis of the exhaust pipe; The flue gas is divided into two paths from the smoke collection hood. The first path enters the exhaust pipe through the first ventilation opening and flows upward; The second path enters the exhaust pipe tangentially from the exhaust pipe through the second ventilation opening, the pipe and the third ventilation opening. The self - speed of the flue gas is used to provide a tangential thrust to the flue gas in the exhaust pipe, so that the flue gas in the exhaust pipe spirally rises as a whole. During the spiral rising process, the tiny droplets carried by the flue gas contact the inner wall of the exhaust pipe and adhere to the inner wall.

8. The flue gas denitrification process according to claim 1, characterized in that, It also includes that during the flue gas treatment process, part of the liquid in the liquid storage area circulates between the liquid storage area and the absorption area pit subsystem, and the absorption agent after participating in the flue gas treatment is detected through the absorption area pit subsystem.

9. The flue gas denitrification process according to claim 1, characterized in that, It also includes that during the maintenance period, the absorption agent in the liquid storage area is transported to the absorption agent buffer system for buffering, and after the maintenance, the absorption agent in the absorption agent buffer system is transported back to the liquid storage area.

10. A flue gas denitrification system, characterized in that, The flue gas denitrification system is used for the flue gas denitrification process as described in claims 1 to 9. The flue gas denitrification system includes: A flue gas treatment tower. A central processor, a spraying assembly and a demisting assembly are sequentially arranged in the flue gas treatment tower from bottom to top. A flue gas outlet is provided at the upper end of the flue gas treatment tower. A flue gas inlet is provided on the flue gas treatment tower. A liquid storage area is provided at the lower part of the flue gas treatment tower; The flue gas inlet is located between the central processor and the liquid storage area. The flue gas converges with the absorption agent sprayed by the spraying assembly at the central processor, and the flue gas is denitrified by the absorption agent; An absorption agent circulation subsystem. The first end of the absorption agent circulation subsystem is communicated with the liquid storage area, and the second end is communicated with the spraying assembly, and is used for circulating and transporting the absorption agent in the liquid storage area to the spraying assembly for downward spraying by the spraying assembly; A chemical agent delivery subsystem, which is communicated with the liquid storage area and is used for delivering the treatment chemical agent to the liquid storage area; A waste liquid treatment subsystem, which is communicated with the liquid storage area and is used for recycling and treating the waste liquid; An oxygen input subsystem, which is used for inputting oxygen into the flue gas treatment tower to promote the oxidation reaction of the sulfur - containing substances in the flue gas treatment tower in the lower valence state.

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