Desulfurization wastewater ammonia nitrogen treatment method and ammonia removal equipment

Abstract

The application relates to a desulfurization wastewater ammonia nitrogen treatment method and a deamination device, which comprises the following steps: S1, filtering wastewater, and removing the filtered sundries; S2, adding medicine water into the wastewater filtered once to make the wastewater produce a flocculation reaction, and then filtering and removing the sundries generated by flocculation; S3, heating the wastewater filtered twice, and in the heating process, integrating an alkaline substance to separate ammonia ion in the wastewater and form ammonia gas, condensing the ammonia gas into ammonia water, and collecting the ammonia water; and S4, performing SNCR+SCR denitration on the ammonia water formed by condensation. After the wastewater is filtered once, flocculation is carried out, and then filtering is carried out again, finally, the ammonia gas is blown out from the wastewater through heating and blowing, and in the process of removing the ammonia nitrogen compound, the treatment equipment is not easy to be blocked by the substances in the wastewater.

Description

Technical Field

[0001] This application relates to the technical field of ammonia removal equipment, and in particular to a method for treating ammonia nitrogen in desulfurization wastewater and ammonia removal equipment. Background Technology

[0002] The process of generating electricity from coal produces wastewater. This wastewater contains trace amounts of heavy metals, chloride ions, ammonia nitrogen, and other substances that cannot be directly discharged and require treatment. Ammonia nitrogen is particularly difficult to treat. Current treatment methods involve repeatedly circulating the wastewater through an absorption tower. However, prolonged circulation of the wastewater in the tower can lead to scaling of the pipes and corrosion of the equipment, thus compromising its safety.

[0003] Therefore, a new technical solution is needed to address the above problems. Summary of the Invention

[0004] In order to minimize the impact on the safe operation of the desulfurization tower when treating ammonia nitrogen in wastewater, this application provides a method for treating ammonia nitrogen in desulfurization wastewater and ammonia removal equipment.

[0005] This application provides a method and equipment for treating ammonia nitrogen in desulfurization wastewater, which adopts the following technical solution:

[0006] A method for treating ammonia nitrogen in desulfurization wastewater includes the following steps:

[0007] S1. Filter the wastewater to remove the filtered impurities;

[0008] S2. Add the chemical solution to the wastewater that has been filtered once to cause a flocculation reaction in the wastewater, and then filter and remove the impurities generated by flocculation.

[0009] S3. Heat the wastewater that has undergone secondary filtration. During the heating process, an alkaline substance is added to separate the ammonium ions in the wastewater and form ammonia gas. The ammonia gas is then condensed into ammonia water and collected.

[0010] S4. The ammonia water formed after condensation is subjected to SNCR+SCR denitrification.

[0011] By adopting the above technical solution, after the wastewater is filtered once, it is flocculated, then filtered again, and finally the ammonia gas is blown out of the wastewater by heating and stripping. In the process of removing ammonia nitrogen compounds, the inside of the treatment equipment is not easily blocked by substances in the wastewater.

[0012] An ammonia removal device includes a tower body and a plurality of trays disposed within the tower body. The tower body has an inlet for introducing wastewater and an outlet for discharging gas at the top, an inlet for introducing steam at the bottom, and an outlet for discharging the deammoniation wastewater after the reaction at the bottom. The upper surface of each tray is provided with a plurality of through holes for the passage of steam and wastewater.

[0013] The tray is detachably connected to the inside of the tower body along the vertical direction. Several support rings are coaxially arranged inside the tower body. The support rings are arranged along the axial direction of the tower body. The lower end of the tray abuts against the support rings. The upper end of the support rings has a relief groove that penetrates through the inner and outer walls of the support rings. The tray passes vertically through the relief groove.

[0014] By adopting the above technical solution, the tray and the tower body can be detachably connected, so that the tray can be easily replaced after being blocked, thus making it less likely to affect the normal use of the ammonia removal equipment. When installing the tray, keep the tray vertical and pass through the clearance groove. When it is moved above the support ring to be installed, rotate the tray to be horizontal and place it on the support.

[0015] Optionally: The support ring is provided with a plurality of guide members, which are respectively provided on both sides of the relief groove. The upper ends of the guide members provided on both sides of the same relief groove are close to the side wall of the relief groove and can move away from each other. The vertically arranged tray passes through the space between two guide members.

[0016] By adopting the above technical solution, the downward movement of the tray is guided by the guide components, so that the tray can easily enter the clearance groove between the guide components, making the downward movement of the tray more convenient and the installation of the tray more convenient.

[0017] Optionally: The tray is provided with a positioning groove that penetrates the side wall of the tray, and the guide is embedded in the positioning groove.

[0018] By adopting the above technical solution, after the tray is placed on the support ring, the position of the tray is limited by the guide component, so that the tray will not rotate, thereby directly limiting the position of the tray within the tower body.

[0019] Optionally: The upper end of the tray is provided with several extensions, the extensions are open at the bottom, the tray is provided with several connection holes communicating with the inner cavity of the extensions, and the side wall of the extensions is provided with several air passage holes communicating with the inner cavity of the extensions.

[0020] By adopting the above technical solution, when the liquid flows downward along the through hole, the steam can flow upward along the vent hole, thus making the upward flow of ammonia and steam less affected.

[0021] Optionally, the tower body is provided with multiple sets of cleaning components for cleaning the tower trays. Each cleaning component includes a gear ring coaxially rotating below the tower tray, a brush fixed radially to the gear ring, a cleaning gear rotatably connected to the inner wall of the tower tray, and a rotating rod passing through the tower body. The cleaning gear is fixed to the rotating rod, one end of the brush is fixed to the inner wall of the gear ring, and the other end of the brush is rotatably connected to the axis below the tower tray. The cleaning gear meshes with the gear ring.

[0022] By adopting the above technical solution, after a period of use, the lower surface of the tray is washed with a brush to clean the material adhering to the bottom of the tray, thereby preventing excessive material from adhering to the bottom of the tray and reducing the number of times the tray needs to be disassembled and cleaned.

[0023] Optionally: The outer wall of the tower body is provided with a drive assembly that can simultaneously drive multiple rotating rods to rotate. The drive assembly includes a rotating shaft rotatably connected to the outer wall of the tower body, a plurality of first bevel gears coaxially fixed to the rotating shaft, second bevel gears coaxially fixed to the rotating rods respectively, and a drive component that drives the rotating shaft to rotate. The first bevel gears mesh with the second bevel gears.

[0024] By adopting the above technical solution, multiple rotating rods can be driven to rotate simultaneously using the drive component, thereby enabling the cleaning of the lower surfaces of multiple trays at one time.

[0025] Optionally: The upper end of the brush is provided with a plurality of cleaning components for cleaning through holes along its length direction. The cleaning components include a fixed rod fixed to the brush, a movable rod slidably disposed on the fixed rod, and an elastic element for pushing the movable rod upward. The upper end face of the movable rod is conical. The upper end of the movable rod is inserted into the through hole. The conical part of the movable rod is lower than the lower end face of the tray. The lower end of the through hole is flared.

[0026] By adopting the above technical solution, during the process of cleaning the lower end face of the tray with a brush, the upper end of the movable rod is inserted into the through hole, causing the material adhering to the through hole to be pushed out, thereby cleaning the inside of the through hole and making the downward flow of liquid less affected.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By filtering the liquid, followed by flocculation and then filtration, impurities are less likely to remain in the liquid. Then, ammonia nitrogen compounds in the liquid are separated by heating and stripping, thus preventing pipe blockage during the separation of ammonia nitrogen compounds in wastewater.

[0029] 2. By setting up a cleaning component to clean the bottom of the tray, the tray can be cleaned without disassembling it, thereby increasing the time that the tray can be used per session. Attached Figure Description

[0030] Figure 1 A flowchart of a method for treating ammonia nitrogen in desulfurization wastewater;

[0031] Figure 2 This is a schematic diagram of the ammonia removal equipment.

[0032] Figure 3 This is a diagram of the internal structure of the ammonia removal equipment;

[0033] Figure 4 for Figure 3 Enlarged view of part A;

[0034] Figure 5 To illustrate the structural diagram of the cleaning components;

[0035] Figure 6 This is a schematic diagram illustrating the structure of the cleaning component.

[0036] In the diagram, 1. Tower body; 11. Water inlet; 12. Air inlet; 13. Water outlet; 14. Air outlet; 15. Support ring; 151. Clearance groove; 16. Guide component; 2. Tower tray; 21. Through hole; 22. Positioning groove; 23. Extension component; 231. Air passage hole; 24. Connection hole; 3. Cleaning component; 31. Gear ring; 32. Brush; 33. Cleaning gear; 34. Rotating rod; 4. Drive component; 41. Rotating shaft; 42. First bevel gear; 43. Second bevel gear; 44. Drive component; 5. Cleaning component; 51. Fixed rod; 511. Spiral groove; 52. Movable rod; 53. Elastic component; 54. Scraper; 55. Rotating disk; 56. Guide rod. Detailed Implementation

[0037] The present application will be further described in detail below with reference to the accompanying drawings.

[0038] This application discloses a method for treating ammonia nitrogen in desulfurization wastewater, such as... Figure 1 As shown, it includes the following steps:

[0039] S1. The wastewater is filtered through a filter press to remove suspended solids from the wastewater;

[0040] S2. Add the chemical solution to the wastewater that has been filtered once to cause a flocculation reaction in the wastewater, and let it stand for a certain period of time. Remove the clear liquid at the top and filter the liquid mixed with sediment at the bottom through a filter press.

[0041] S3. The upper liquid and the filtered lower liquid are preheated by the boiler or by secondary steam. Then steam is introduced into the mixed liquid. During the heating process, alkaline substances are introduced to separate the ammonium ions in the wastewater and form ammonia gas. The ammonia gas is mixed with the steam and the air is condensed and the ammonia water is collected.

[0042] S4. The ammonia water formed after condensation is subjected to SNCR+SCR denitrification.

[0043] A type of ammonia removal equipment, such as Figure 2 and Figure 3 As shown, the structure includes a vertically arranged tower body 1 and several trays 2 disposed within the tower body 1. The trays 2 are coaxially arranged with the tower body 1, and the outer wall of the trays 2 is in contact with the inner wall of the tower body 1. The trays 2 are arranged along the axis of the tower body 1. Several through holes 21 are provided on the trays 2 for downward flow of liquid, and steam can also flow upward through the through holes 21 on the trays 2. A water inlet 11 is provided at the top of the tower body 1, through which liquid enters the interior of the tower body 1 and flows downward step by step along the through holes 21 on the trays 2. An air inlet 12 is provided at the bottom of the tower body 1 to allow steam to enter the interior of the tower body 1. After entering the air inlet 12, the steam flows upward step by step through the through holes 21, thereby heating the liquid and causing the ammonia contained in the liquid to vaporize and flow upward with the steam. An air outlet 14 is also provided at the top of the tower body 1, communicating with its internal cavity. Ammonia and steam flow outward through the air outlet 14 and are collected. The lower end of the tower body 1 is also provided with an outlet 13 for discharging the liquid after the reaction. The liquid discharged from the outlet 13 can be returned to the boiler for continued use.

[0044] like Figure 3 As shown, the tray 2 is detachably connected to the tower body 1. Several support rings 15 are coaxially arranged within the tower body 1, arranged along the axis of the tower body 1, with the spacing between adjacent support rings 15 greater than the inner diameter of the tower body 1. Two clearance grooves 151 are formed at the upper end of each support ring 15, spaced far apart and dividing the support ring 15 into two arcs of equal curvature. The width of the clearance grooves 151 is greater than the thickness of the tray 2. An elastic ring is coaxially arranged on the side wall of the tray 2. The vertically positioned tray 2 can pass through the clearance grooves 151 and move to the underside of the support rings 15. When the tray 2 rotates to a horizontal position, the lower end of the tray 2 abuts against the upper end of the support ring 15, and the side wall of the tray 2 abuts against the inner wall of the tower body 1, thus ensuring the tray 2 is stably positioned on the support rings 15. When the accumulation of sediment on tray 2 obstructs the downward flow of liquid, tray 2 can be rotated to a vertical position to remove it from the tower body 1, making tray 2 replacement more convenient.

[0045] To facilitate the passage of tray 2 through relief groove 151, a number of guide members 16 are provided on the upper end face of support ring 15. The guide members 16 are respectively provided on both sides of relief groove 151. The upper ends of the side walls of the guide members 16 provided on both sides of the same relief groove 151 are far apart, thereby increasing the distance between the upper ends of the two guide members 16. When tray 2 moves toward relief groove 151, the guide members 16 can guide the movement of tray 2, making it easier for tray 2 to enter between the two relief grooves 151.

[0046] After the tray 2 is placed on the support ring 15, in order to prevent the position of the tray 2 from changing, a positioning groove 22 is also provided on the upper end of the tray 2. The positioning groove 22 penetrates the side wall of the tray 2. The guide members 16 located on both sides of the same clearance groove 151 are simultaneously inserted into the positioning groove 22. The side walls of the guide members 16 on the same clearance groove 151 that are far apart abut against the side walls of the positioning groove 22 that are far apart, thereby using the guide members 16 to limit the position of the tray 2, so that the tray 2 will not rotate along its own axis.

[0047] like Figure 3 and Figure 4 As shown, when the liquid flows to the top of the tray 2, it will cover the through holes 21 on the tray 2, thus affecting the upward flow of steam. Therefore, the upper end of the tray 2 is also provided with several downward-opening extensions 23. The upper end of the tray 2 is also provided with several connecting holes 24, which are connected to the inner cavity of the extensions 23. The outer wall of the extensions 23 is also provided with several vent holes 231 that are connected to its inner cavity. During the upward flow of steam, the steam can flow to the top of the tray 2 through the vent holes 231, so that the upward flow of steam is not easily affected.

[0048] To further extend the service life of the tray 2, the tower body 1 is equipped with multiple cleaning components 3 for cleaning the tray 2. Each cleaning component 3 includes a gear ring 31 coaxially rotating below the tray 2, a brush 32 fixed radially to the gear ring 31, a cleaning gear 33 rotatably connected to the inner wall of the tray 2, and a rotating rod 34 passing through the tower body 1. The teeth of the gear ring 31 are oriented away from the tray 2. One end of the brush 32 is rotatably connected to the bottom of the tray 2, and the axis of rotation of the brush 32 coincides with the axis of rotation of the tray 2. The other end of the brush 32 is fixed to the inner wall of the gear ring 31, so that the brush 32 rotates synchronously when the gear ring 31 rotates. The upper end of the brush 32 abuts against the lower end of the tray 2, cleaning the bottom of the tray 2. Furthermore, when passing under the through-hole 21, it can also clean any residue adhering to the lower part of the through-hole 21, ensuring that the flow of liquid within the through-hole 21 is not significantly affected. The rotating rod 34 is horizontally positioned and passes through the inside and outside of the tower body 1. The rotating rod 34 is rotatably connected to the tower body 1 through a bearing. One end of the rotating rod 34 located inside the tower body 1 is coaxially fixed with the cleaning gear 33. The cleaning gear 33 is engaged with the gear ring 31.

[0049] A drive assembly 4 is provided on the outer wall of the tower body 1 to simultaneously drive multiple rotating rods 34 to rotate. The drive assembly 4 includes a rotating shaft 41 rotatably connected to the outer wall of the tower body 1, a plurality of first bevel gears 42 coaxially arranged on the rotating shaft 41, second bevel gears 43 coaxially fixed to the ends of the rotating rods 34 located outside the tower body 1, and a drive member 44 that drives the rotating shaft 41 to rotate. The first bevel gears 42 mesh with the second bevel gears 43. The rotating shaft 41 is vertically arranged and is mounted on the outside of the tower body 1 through bearings. In this embodiment, the drive member 44 is a motor. The drive member 44 is mounted on the outer wall of the tower body 1, and the free end of the drive member 44 is connected to the rotating shaft 41 through a reducer, thereby driving the rotating shaft 41 to rotate.

[0050] like Figure 5 and Figure 6As shown, when liquid passes through the water passage, some substances may adhere to the inner wall of the water passage, thus affecting the passage of liquid. Therefore, the upper end of the brush 32 is provided with several pairs of cleaning components 5 along its length to clean the passage. The cleaning component 5 includes a fixed rod 51 fixed to the brush 32, a movable rod 52 slidably disposed on the fixed rod 51, and an elastic component 53 that pushes the movable rod 52 upward. The fixed rod 51 is hollow, the movable rod 52 passes through the fixed rod 51 and moves upward. In this embodiment, the elastic component 53 is a spring. The elastic component 53 is disposed in the inner cavity of the fixed rod 51, one end of the elastic component 53 abuts against the lower end of the movable rod 52, and the other end of the elastic component 53 abuts against the brush 32, thereby pushing the movable rod 52 upward. The upper end of the movable rod 52 is tapered, and the lower end of the through hole 21 is flared. The upper end of the movable rod 52 is inserted into the through hole 21, and the tapered sidewall of the movable rod 52 abuts against the inner wall of the through hole 21.

[0051] The movable rod 52 has several scrapers 54 on its conical sidewall. The scrapers 54 are arranged along the height of the conical sidewall and can abut against the inner wall of the through hole 21 and move relative to it. A rotating disk 55 is rotatably connected to the lower end of the movable rod 52. The rotation axis of the rotating disk 55 coincides with the axis of the movable rod 52. One end of the elastic element 53 near the movable rod 52 abuts against the end face of the rotating disk 55 away from the movable rod 52. A spiral groove 511 is provided on the inner wall of the fixed rod 51, which passes through the lower end face of the fixed rod 51. A guide rod 56 is provided on the sidewall of the movable rod 52 and slides within the spiral groove 511. The scraper 54 is a flexible metal sheet. The end of the scraper away from the movable rod 52 is inclined in the direction of rotation when the movable rod 52 moves upward. As the movable rod 52 moves along its axis, the movable rod 52 can rotate along its own axis, thereby moving the scraper 54 relative to the through hole 21 and cleaning the inner wall of the through hole 21.

[0052] The implementation principle of this embodiment is as follows: After the liquid enters the tower body 1 from above, the liquid gradually moves downward along the through hole 21, while the steam moves upward to heat the liquid, thereby causing the ammonia in the liquid to evaporate and enter the steam, and then be discharged with the movement of the steam. The drive unit 44 is activated at regular intervals, causing the brush 32 to tilt against the lower end face of the tower tray 2. During the rotation of the brush 32, the upper end of the movable rod 52 is inserted into the through hole 21, and the scraper 54 cleans the inside of the through hole 21.

[0053] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ammonia removal device, comprising a tower body (1) and a plurality of trays (2) disposed within the tower body (1), wherein the tower body (1) is provided with an inlet (11) for introducing wastewater and an outlet (14) for discharging gas at the top, an inlet (12) for introducing steam at the bottom, and an outlet (13) for discharging the ammonia removal wastewater after reaction at the bottom, wherein the upper surface of each tray (2) is provided with a plurality of through holes (21) for passing steam and wastewater; The tray (2) is detachably connected to the inside of the tower body (1) along the vertical direction. Several support rings (15) are coaxially arranged inside the tower body (1). The support rings (15) are arranged along the axial direction of the tower body (1). The lower end of the tray (2) abuts against the support rings (15). The upper end of the support rings (15) has a relief groove (151) that passes through the inner and outer walls of the support rings (15). The tray (2) passes vertically through the relief groove (151). Multiple sets of support rings (2) are arranged inside the tower body (1) to support the tray (2). The cleaning assembly (3) for cleaning includes a gear ring (31) coaxially rotating below the tray (2), a brush (32) fixed radially to the gear ring (31), a cleaning gear (33) rotatably connected to the inner wall of the tray (2), and a rotating rod (34) passing through the tower body (1). The cleaning gear (33) is fixed to the rotating rod (34). One end of the brush (32) is fixed to the inner wall of the gear ring (31), and the other end of the brush (32) is rotatably connected to the axis below the tray (2). The brush (32) meshes with the gear ring (31); the outer wall of the tower body (1) is provided with a drive assembly (4) that simultaneously drives multiple rotating rods (34) to rotate. The drive assembly (4) includes a rotating shaft (41) rotatably connected to the outer wall of the tower body (1), a plurality of first bevel gears (42) coaxially fixed on the rotating shaft (41), second bevel gears (43) coaxially fixed on the rotating rods (34), and a drive member (44) that drives the rotating shaft (41) to rotate. The first bevel gears (42) mesh with the second bevel gears (43); the upper end of the brush (32) along its length A number of cleaning components (5) are provided in the degree direction for cleaning through holes (21). The cleaning component (5) includes a fixed rod (51) fixed on a brush (32), a movable rod (52) slidably disposed on the fixed rod (51), and an elastic element (53) for pushing the movable rod (52) upward. The upper end face of the movable rod (52) is conical. The upper end of the movable rod (52) is inserted into the through hole (21). The conical part of the movable rod (52) is lower than the lower end face of the tray (2). The lower end of the through hole (21) is flared. The movable rod (52) has several scrapers (54) on its conical sidewall. The scrapers (54) are arranged along the height direction of the conical sidewall. The scrapers (54) can abut against the inner wall of the through hole (21) and generate relative movement. The lower end of the movable rod (52) is rotatably connected to a rotating disk (55). The rotation axis of the rotating disk (55) coincides with the axis of the movable rod (52). The end of the elastic element (53) near the movable rod (52) abuts against the end face of the rotating disk (55) away from the movable rod (52). The inner wall of the fixed rod (51) is provided with a spiral groove (511). The spiral groove (511) passes through the lower end face of the fixed rod (51). The sidewall of the movable rod (52) is provided with a guide rod (56). The guide rod (56) is embedded in the spiral groove (511) and slides.

2. The ammonia removal equipment according to claim 1, characterized in that: The support ring (15) is provided with a plurality of guide members (16), which are respectively provided on both sides of the relief groove (151). The upper ends of the guide members (16) provided on both sides of the same relief groove (151) are far apart from each other, and the vertically arranged tray (2) passes through the space between the two guide members (16).

3. The ammonia removal equipment according to claim 2, characterized in that: The tray (2) is provided with a positioning groove (22), which penetrates the side wall of the tray (2), and the guide (16) is embedded in the positioning groove (22).

4. The ammonia removal equipment according to claim 1, characterized in that: The upper end of the tray (2) is provided with several extensions (23), the extensions (23) are open at the bottom, the tray (2) is provided with several connecting holes (24) communicating with the inner cavity of the extensions (23), and the side wall of the extensions (23) is provided with several air passage holes (231) communicating with its inner cavity.

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