Ammonia nitrogen wastewater negative pressure stripping ammonia system
By setting up a combination structure of tower plates and steam pipes in the ammonia stripping tower, combined with stirring blades, uniform steam coverage in ammonia nitrogen wastewater treatment is achieved, solving the problem of low steam utilization and improving the efficiency of ammonia nitrogen wastewater treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2026-06-05
Smart Images
Figure CN224325180U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ammonia stripping tower technology, and in particular to a negative pressure stripping ammonia stripping system for ammonia nitrogen wastewater. Background Technology
[0002] The ammonia nitrogen wastewater negative pressure stripping ammonia stripping system is an industrial treatment device that reduces the solubility of ammonia gas in a negative pressure environment and removes ammonia nitrogen from wastewater by steam stripping. This technology is mainly used in the treatment of high ammonia nitrogen wastewater in industries such as coking, metallurgy, and chemicals. Its core functions include: reducing the ammonia nitrogen content in wastewater to meet the requirements of subsequent biochemical treatment; recovering ammonia resources to achieve resource recycling; and reducing the operating temperature from the conventional 110℃ to 65-85℃ under negative pressure conditions, significantly reducing energy consumption and avoiding high-temperature corrosion.
[0003] In existing technologies, negative pressure stripping ammonia stripping systems typically consist of an ammonia stripping tower, a steam compressor, a steam pipe, a feed tank, a tower bottom tank, and a reflux unit. These components are connected in series via pipelines to form a closed-loop circulation. The tower bottom tank is fixedly installed at the bottom of the ammonia stripping tower, while the steam compressor and feed tank are installed on one side of the tower. One end of the steam pipe is connected to the steam compressor, and the other end is fixedly installed above the tower bottom tank. Multiple upward-facing steam outlets are provided on the steam pipe. The negative pressure at the top of the ammonia stripping tower is maintained by a vacuum pump, and mixed steam is introduced into the bottom of the tower through the steam pipe. This achieves countercurrent gas-liquid contact within the ammonia stripping tower, promoting the transfer of ammonia molecules from the liquid phase to the gas phase. The tower bottom tank is connected to the wastewater outlet at the bottom of the ammonia stripping tower, discharging the high-temperature ammonia removal wastewater. The ammonia gas is then liquefied and concentrated by the reflux unit to form a controlled-concentration ammonia water product.
[0004] Regarding the aforementioned technologies, since the steam pipe is only located above the bottom tank of the tower and the steam coverage is concentrated in the central area of the ammonia stripping tower, there may be uneven steam distribution and reduced gas-liquid contact time and area, resulting in low steam utilization. Therefore, improvements are made to address this issue. Utility Model Content
[0005] To improve steam utilization, this application provides a negative pressure stripping system for ammonia nitrogen wastewater.
[0006] The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system provided in this application adopts the following technical solution:
[0007] A negative pressure stripping system for ammonia nitrogen wastewater includes an ammonia stripping tower body, which comprises a tower body, a bottom tank, a feed tank, and a steam compressor. The bottom tank is fixedly installed at the bottom of the tower body. The feed tank and the steam compressor are both located on one side of the tower body. Multiple sets of trays are fixedly installed vertically within the tower body. Multiple sets of baffles are staggered on each tray. Feed ports are staggered on each tray and located on the side of the baffles closest to the tower body. The upper part of the tower body is a rectification section, and the lower part is a stripping section. A feed pipe is fixedly connected to the feed tank. The end of the feed pipe away from the feed tank is connected to the tower body and located at the upper end of the stripping section. A stripping assembly for fully stripping ammonia nitrogen wastewater is provided within the tower body.
[0008] By adopting the above technical solution, ammonia nitrogen wastewater in the feed tank is added to the ammonia stripping tower through the feed pipe. The ammonia nitrogen wastewater can flow along the tower plates and baffles, and flow to the next tower plate at the discharge port. The steam compressor is started to allow steam to enter the ammonia stripping tower and strip the ammonia nitrogen wastewater. Compared with the prior art that only relies on bottom steam for stripping, the stripping component in this application can fully strip the ammonia nitrogen wastewater in the stripping section, rectification section and tower bottom tank, thereby improving the ammonia stripping efficiency of steam on ammonia nitrogen wastewater, making the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization.
[0009] Optionally, the stripping assembly includes an inlet pipe, a steam regulating valve, a first annular steam pipe, a second annular steam pipe, a connecting pipe, and a reflux stripping component. One end of the inlet pipe is connected to the outlet of the steam compressor, and the other end is located at the top of the column bottom tank. The first annular steam pipe is connected to the end of the inlet pipe away from the steam compressor, and multiple sets of air outlets are vertically downward at the bottom of the first annular steam pipe. One end of the connecting pipe is connected to the inlet pipe, and the other end is located in the middle of the stripping section of the ammonia stripping column, below the column tray. The second annular steam pipe is connected to the end of the connecting pipe away from the inlet pipe, and multiple sets of air outlets are inclined upward at the top of the second annular steam pipe. The steam regulating valve is located on the side of the inlet pipe near the ammonia stripping column and on the connecting pipe. The reflux stripping component is located in the rectification section of the ammonia stripping column and is used to fully strip the refluxed ammonia water.
[0010] By adopting the above technical solution, the steam compressor is started, and the steam in the steam compressor can be input to the first annular steam pipe and the second annular steam pipe through the inlet pipe and the connecting pipe respectively, and sprayed out through the outlet. The steam sprayed obliquely upward from the second annular steam pipe can fully strip the ammonia nitrogen wastewater in the stripping section, and the steam sprayed vertically downward from the first annular steam pipe can fully strip the ammonia water in the bottom tank, thereby increasing the contact area between the ammonia nitrogen wastewater and the steam, improving the steam utilization rate and ammonia removal rate. In addition, the steam regulating valve can realize precise control of the first annular steam pipe and the second annular steam pipe, and adjust itself according to the working conditions.
[0011] Optionally, the reflux stripping component includes a splitter pipe and a third annular steam pipe. One end of the splitter pipe is connected to the inlet pipe, and the other end is provided with multiple sets of outlets corresponding to the trays of the rectification section in the ammonia stripping tower. Multiple sets of the third annular steam pipe are provided and are respectively connected to the multiple sets of outlets of the splitter pipe. The third annular steam pipe is located below the tray, and a downward-facing gas outlet is opened at the bottom of the third annular steam pipe. A splitter regulating valve is provided on the splitter pipe.
[0012] By adopting the above technical solution, the steam in the steam compressor can enter multiple sets of third annular steam pipes through the splitter pipes and be ejected from the outlet. The steam ejected downward from the third annular steam pipes can fully strip the ammonia water returning from the rectification section. Compared with the existing technology that only relies on bottom steam for stripping, this improves the ammonia stripping efficiency of the steam on the ammonia water returning from the rectification section, makes the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization. In addition, the splitter regulating valve can precisely adjust the steam in the splitter pipes according to the actual working conditions.
[0013] Optionally, a drive motor is bolted to the outer peripheral wall of the tower tank, and a rotating rod is fixedly installed on the output end of the drive motor. The rotating rod passes through the tower tank and is rotatably mounted on the tower tank. Multiple sets of stirring blades are fixedly installed on the rotating rod.
[0014] By adopting the above technical solution, the drive motor is started, and the output end of the drive motor drives the rotating rod to rotate. The rotation of the rotating rod drives the stirring blades to rotate, thereby stirring the ammonia water in the tower bottom tank, so that the ammonia water can fully contact the steam, thereby improving the ammonia removal rate and steam utilization rate.
[0015] Optionally, a shell-and-tube heat exchanger is vertically fixedly installed at the top inner side of the ammonia stripping tower. A water inlet pipe is connected to the shell-side inlet end of the shell-and-tube heat exchanger. A plate heat exchanger is fixedly installed between the feed tank and the ammonia stripping tower. A water outlet pipe is connected to the high-temperature fluid inlet end of the shell-and-tube heat exchanger. The feed pipe is connected to the low-temperature fluid inlet and outlet ends of the plate heat exchanger.
[0016] By adopting the above technical solution, after the steam in the ammonia stripping tower has fully stripped the ammonia nitrogen wastewater, it will rise to the top of the tower. At this time, the shell-and-tube heat exchanger adds low-temperature water through the inlet pipe and exchanges heat with the steam. The water after heat exchange is then fed into the plate heat exchanger through the outlet pipe. The water after heat exchange then exchanges heat with the ammonia nitrogen wastewater fed through the feed pipe in the plate heat exchanger, thereby utilizing waste heat to preheat the ammonia nitrogen wastewater and reducing steam consumption.
[0017] Optionally, the baffles in the stripping section of the ammonia stripping tower are all equipped with spiral downcomers to increase the contact area between steam and ammonia nitrogen wastewater.
[0018] By adopting the above technical solution, the spiral downcomer can increase the contact area between steam and ammonia nitrogen wastewater, thereby improving the ammonia removal rate and steam utilization rate.
[0019] Optionally, guide pipes are provided on the side of the baffle above the first annular steam pipe and the second annular steam pipe in the rectification section of the ammonia stripping tower body, near the side wall of the ammonia stripping tower body.
[0020] By adopting the above technical solution, the guide pipe can prevent ammonia nitrogen wastewater from flowing into the outlet holes of the first and second annular steam pipes, thereby avoiding crystallization and blockage of the first and second annular steam pipes.
[0021] Optionally, the outer walls of the stripping and rectification sections of the ammonia stripping tower are coated with a heat-insulating coating.
[0022] By adopting the above technical solutions, the heat insulation coating can reduce the heat loss in the stripping and rectification sections of the ammonia stripping tower, thereby reducing the amount of steam consumed.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] 1. The stripping assembly in this application can fully strip ammonia nitrogen wastewater. Upon starting the steam compressor, steam from the compressor is fed into the first and second annular steam pipes via the inlet pipe and connecting pipe, respectively, and ejected from the outlet. The steam ejected obliquely upwards from the second annular steam pipe can fully strip the ammonia nitrogen wastewater in the stripping section, while the steam ejected vertically downwards from the first annular steam pipe can fully strip the ammonia water in the bottom tank. This increases the contact area between the ammonia nitrogen wastewater and the steam, improving steam utilization and ammonia removal rate. Furthermore, the steam regulating valve can achieve precise control of the first and second annular steam pipes, automatically adjusting according to operating conditions.
[0025] 2. The reflux stripping unit in this application can fully strip the refluxed ammonia water. The steam in the steam compressor can enter multiple sets of third annular steam pipes through the split pipe and be ejected from the outlet. The steam ejected downward from the third annular steam pipe can fully strip the refluxed ammonia water in the rectification section again. Compared with the prior art, which only relies on bottom steam for stripping, it improves the ammonia stripping efficiency of steam on the refluxed ammonia water in the rectification section, makes the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization. In addition, the split regulating valve can precisely adjust the steam in the split pipe according to the actual working conditions.
[0026] 3. The drive motor, rotating rod, and stirring blades in this application can stir the ammonia water in the tower bottom tank. When the drive motor is started, the output end of the drive motor drives the rotating rod to rotate, and the rotation of the rotating rod drives the stirring blades to rotate, thereby stirring the ammonia water in the tower bottom tank, so that the ammonia water can fully contact the steam, thereby improving the ammonia removal rate and steam utilization rate. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;
[0029] Figure 2 This is a partial structural diagram;
[0030] Figure 3 This is a schematic diagram of another part of the structure.
[0031] Reference numerals in the attached drawings: 1. Ammonia stripping tower body; 11. Tower bottom tank; 12. Feed tank; 121. Feed pipe; 13. Steam compressor; 14. Tower plate; 15. Baffle; 151. Spiral downcomer; 152. Guide pipe; 2. Stripping assembly; 21. Air inlet pipe; 22. Steam regulating valve; 23. First annular steam pipe; 24. Second annular steam pipe; 25. Connecting pipe; 3. Reflux stripping component; 31. Diverter pipe; 32. Third annular steam pipe; 33. Diverter regulating valve; 4. Drive motor; 41. Rotating rod; 42. Stirring blade; 5. Shell and tube heat exchanger; 51. Water inlet pipe; 52. Water outlet pipe; 6. Plate heat exchanger. Detailed Implementation
[0032] This application discloses an ammonia stripping system for ammonia nitrogen wastewater under negative pressure, comprising an ammonia stripping tower body, a vacuum stabilization system, and a feed control system. The vacuum stabilization system is equipped with a water ring vacuum pump (ultimate vacuum -95kPa, power 55kW) to maintain the working pressure inside the tower at -20kPa±0.5kPa. The end uses a liquid-sealed pressure stabilizing tank with a designed effective volume ≥3m³, and has a built-in float level gauge (accuracy ±3mm) and a pneumatic regulating valve to suppress pressure fluctuations within ±1.5kPa. A vacuum break device is installed to automatically introduce nitrogen for protection when the pressure is abnormal (>-10kPa or <-30kPa).
[0033] The feed control system adopts an A / B dual-path electric valve group (switching time < 8s) and is equipped with a pressure balance bypass to achieve automatic feed switching without disturbance and dynamic liquid replenishment. Based on the online ammonia concentration analyzer in the bottom of the tower (measurement cycle 30s, accuracy ±0.1wt%), it ensures that all ammonia in the bottom of the tower overflows and the concentration of ammonia in the discharged liquid from the bottom of the tower is stable at 0.01-0.02wt%.
[0034] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0035] This application discloses an ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system, referring to... Figures 1-3 The ammonia nitrogen wastewater negative pressure stripping ammonia stripping system includes an ammonia stripping tower body, which includes an ammonia stripping tower body 1, a tower bottom tank 11, a feed tank 12, and a steam compressor 13. The tower bottom tank 11 is fixedly installed at the bottom of the ammonia stripping tower body 1. The feed tank 12 and the steam compressor 13 are both bolted to one side of the ammonia stripping tower body 1. Multiple sets of tower plates 14 are fixedly installed vertically inside the ammonia stripping tower body 1. Multiple sets of baffles 15 are fixedly installed on the multiple sets of tower plates 14 in an alternating manner. The multiple sets of tower plates 14 are staggered with discharge ports, which are located on the side of the baffles 15 close to the ammonia stripping tower body 1. The upper part of the ammonia stripping tower body 1 is the rectification section, and the lower part is the stripping section. A feed pipe 121 is fixedly connected to the feed tank 12. The end of the feed pipe 121 away from the feed tank 12 is connected to the ammonia stripping tower body 1 and is located at the upper end of the stripping section of the ammonia stripping tower body 1. A stripping assembly 2 is installed inside the ammonia stripping tower body 1.
[0036] The ammonia nitrogen wastewater in the feed tank 12 is added into the ammonia stripping tower 1 through the feed pipe 121. The ammonia nitrogen wastewater can flow along the tower plate 14 and the baffle 15, and flow to the next tower plate 14 at the discharge port. The steam compressor 13 is started to allow steam to enter the ammonia stripping tower 1 and strip the ammonia nitrogen wastewater. Compared with the prior art, which only relies on bottom steam for stripping, the stripping component 2 in this application can fully strip the ammonia nitrogen wastewater in the stripping section, the rectification section and the bottom tank 11, thereby improving the ammonia stripping efficiency of steam on ammonia nitrogen wastewater, making the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization.
[0037] Reference Figure 1 and Figure 2 To increase the contact area between ammonia nitrogen wastewater and steam and improve steam utilization, the stripping assembly 2 in this embodiment includes an inlet pipe 21, a steam regulating valve 22, a first annular steam pipe 23, a second annular steam pipe 24, a connecting pipe 25, and a reflux stripping component 3. One end of the inlet pipe 21 is connected to the outlet end of the steam compressor 13, and the other end is fixedly installed on the upper end of the tower bottom tank 11. The first annular steam pipe 23 is connected to the end of the inlet pipe 21 away from the steam compressor 13, and the bottom of the first annular steam pipe 23 is vertical. Multiple sets of air outlets are opened downwards. One end of the connecting pipe 25 is connected to the air inlet pipe 21, and the other end is fixedly installed in the middle of the stripping section of the ammonia stripping tower 1, and located below the tower plate 14. The second annular steam pipe 24 is connected to the end of the connecting pipe 25 away from the air inlet pipe 21, and multiple sets of air outlets are opened upwards at the upper part of the second annular steam pipe 24. The steam regulating valve 22 is fixedly installed on the side of the air inlet pipe 21 near the ammonia stripping tower 1 and on the connecting pipe 25. The reflux stripping component 3 is installed in the rectification section inside the ammonia stripping tower 1.
[0038] The steam compressor 13 is started. The steam in the steam compressor 13 can be input to the first annular steam pipe 23 and the second annular steam pipe 24 through the inlet pipe 21 and the connecting pipe 25 respectively, and sprayed out from the outlet. The steam sprayed obliquely upward from the second annular steam pipe 24 can fully strip the ammonia nitrogen wastewater in the stripping section, and the steam sprayed vertically downward from the first annular steam pipe 23 can fully strip the ammonia water in the bottom tank 11, thereby increasing the contact area between the ammonia nitrogen wastewater and the steam, improving the steam utilization rate and ammonia removal rate. In addition, the steam regulating valve 22 can achieve precise control of the first annular steam pipe 23 and the second annular steam pipe 24, and adjust itself according to the working conditions. In this embodiment, the multiple sets of outlet holes opened at the upper part of the second annular steam pipe 24 are oriented towards the outside of the ammonia stripping tower body 1. The opening facing outward can reduce the mutual consumption of steam between opposite outlet holes, and also reduce the coverage blind area, so as to make the steam distribution uniform.
[0039] Reference Figure 1 and Figure 3 When ammonia water is refluxed to the rectification section of the ammonia stripping tower 1, the ammonia water needs to be fully stripped. Therefore, the reflux stripping component 3 in this embodiment includes a split pipe 31 and a third annular steam pipe 32. One end of the split pipe 31 is connected to the inlet pipe 21, and the other end is provided with multiple sets of outlets corresponding to the tower plate 14 of the rectification section in the ammonia stripping tower 1. Multiple sets of the third annular steam pipe 32 are provided and are respectively connected to the multiple sets of outlets of the split pipe 31. The third annular steam pipe 32 is located below the tower plate 14, and the bottom of the third annular steam pipe 32 is provided with a downward-facing gas outlet. A split regulating valve 33 is fixedly installed on the split pipe 31.
[0040] Steam in the steam compressor 13 can enter multiple sets of third annular steam pipes 32 through the split pipe 31 and be ejected from the outlet. The steam ejected downward from the third annular steam pipe 32 can fully strip the ammonia water returning from the rectification section. Compared with the prior art which only relies on bottom steam for stripping, this improves the ammonia stripping efficiency of steam on the ammonia water returning from the rectification section, makes the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization. In addition, the split regulating valve 33 can precisely adjust the steam in the split pipe 31 according to the actual working conditions.
[0041] Reference Figure 1 and Figure 3 When steam strips the ammonia water in the bottom tank 11, it needs to be stirred at the same time. Therefore, in this embodiment, a drive motor 4 is bolted on the outer peripheral wall of the bottom tank 11. A rotating rod 41 is fixedly installed on the output end of the drive motor 4. The rotating rod 41 passes through the bottom tank 11 and is rotatably installed on the bottom tank 11. Multiple sets of stirring blades 42 are fixedly installed on the rotating rod 41.
[0042] Start the drive motor 4. The output end of the drive motor 4 drives the rotating rod 41 to rotate. The rotation of the rotating rod 41 drives the stirring blade 42 to rotate, thereby stirring the ammonia water in the tower bottom tank 11, so that the ammonia water can fully contact the steam, thereby improving the ammonia removal rate and steam utilization rate.
[0043] Reference Figure 1 and Figure 2 In order to recover and utilize the waste heat inside the ammonia stripping tower 1, a shell-and-tube heat exchanger 5 is vertically fixedly installed at the top of the ammonia stripping tower 1 in this embodiment. A water inlet pipe 51 is connected to the shell side water inlet end of the shell-and-tube heat exchanger 5. A plate heat exchanger 6 is fixedly installed between the feed tank 12 and the ammonia stripping tower 1. A water outlet pipe 52 is connected to the high-temperature fluid water inlet end of the shell side of the shell-and-tube heat exchanger 5 and the plate heat exchanger 6. The feed pipe 121 is connected to the low-temperature fluid water inlet and outlet ends of the plate heat exchanger 6.
[0044] After the steam in the ammonia stripping tower 1 has fully stripped the ammonia nitrogen wastewater, it will rise to the top of the ammonia stripping tower 1. At this time, the shell-and-tube heat exchanger 5 adds low-temperature water through the inlet pipe 51 and exchanges heat with the steam. The water after heat exchange is fed into the plate heat exchanger 6 through the outlet pipe 52. The water after heat exchange is then fed into the ammonia nitrogen wastewater fed into the feed pipe 121 through the plate heat exchanger 6, thereby realizing the use of waste heat to preheat the ammonia nitrogen wastewater and reducing the consumption of steam.
[0045] Reference Figure 2When ammonia nitrogen wastewater flows between the trays 14, in order to increase the contact area between the ammonia nitrogen wastewater and the steam, spiral downcomers 151 are fixedly installed on the baffles 15 of the stripping section of the ammonia stripping tower 1 in this embodiment. The spiral downcomers 151 can also improve the ammonia removal rate and steam utilization rate. In this embodiment, the inner and outer walls of the spiral downcomers 151 are coated with graphene material, which can improve the thermal conductivity and reduce the fouling adhesion rate.
[0046] Reference Figure 3 To prevent ammonia nitrogen wastewater from flowing into the outlet holes of the first annular steam pipe 23 and the second annular steam pipe 24, in this embodiment, the baffle 15 of the rectification section of the ammonia stripping tower body 1 and the side of the baffle 15 above the first annular steam pipe 23 and the second annular steam pipe 24 near the side wall of the ammonia stripping tower body 1 are all fixedly installed with guide pipes 152, thereby avoiding crystallization blockage of the first annular steam pipe 23 and the second annular steam pipe 24.
[0047] Reference Figure 1 When stripping ammonia nitrogen wastewater, heat loss may occur in the stripping and rectification sections of the ammonia stripping tower 1. Therefore, in this embodiment, the outer walls of the stripping and rectification sections of the ammonia stripping tower 1 are coated with a heat-insulating coating. The heat-insulating coating can also reduce steam consumption. In this embodiment, the heat-insulating coating is made of polyurethane, which is a preferred material in this embodiment. It can also be made of water-based heat-insulating materials, etc.
[0048] The implementation principle of an ammonia nitrogen wastewater negative pressure stripping ammonia stripping system according to an embodiment of this application is as follows:
[0049] When the steam compressor 13 is started, the steam in the steam compressor 13 can be input to the first annular steam pipe 23 and the second annular steam pipe 24 through the inlet pipe 21 and the connecting pipe 25 respectively, and then sprayed out through the outlet. The steam sprayed obliquely upward from the second annular steam pipe 24 can fully strip the ammonia nitrogen wastewater in the stripping section, and the steam sprayed vertically downward from the first annular steam pipe 23 can fully strip the ammonia water in the bottom tank 11, thereby increasing the contact area between the ammonia nitrogen wastewater and the steam, improving the steam utilization rate and ammonia removal rate. In addition, the steam regulating valve 22 can achieve precise control of the first annular steam pipe 23 and the second annular steam pipe 24, and adjust itself according to the working conditions.
[0050] Steam in the steam compressor 13 can enter multiple sets of third annular steam pipes 32 through the split pipe 31 and be ejected from the outlet. The steam ejected downward from the third annular steam pipe 32 can fully strip the ammonia water returning from the rectification section. Compared with the prior art which only relies on bottom steam for stripping, this improves the ammonia stripping efficiency of steam on the ammonia water returning from the rectification section, makes the steam coverage more uniform, thereby reducing steam consumption and improving steam utilization. In addition, the split regulating valve 33 can precisely adjust the steam in the split pipe 31 according to the actual working conditions.
[0051] Start the drive motor 4. The output end of the drive motor 4 drives the rotating rod 41 to rotate. The rotation of the rotating rod 41 drives the stirring blade 42 to rotate, thereby stirring the ammonia water in the tower bottom tank 11, so that the ammonia water can fully contact the steam, thereby improving the ammonia removal rate and steam utilization rate.
[0052] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0053] The above are all optional 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. A negative pressure stripping system for ammonia nitrogen wastewater, comprising an ammonia stripping tower body, characterized in that: The ammonia stripping tower body includes an ammonia stripping tower body (1), a tower bottom tank (11), a feed tank (12), and a steam compressor (13). The tower bottom tank (11) is fixedly installed at the bottom of the ammonia stripping tower body (1). The feed tank (12) and the steam compressor (13) are both located on one side of the ammonia stripping tower body (1). Multiple sets of tower plates (14) are fixedly installed at intervals along the vertical direction inside the ammonia stripping tower body (1). Multiple sets of baffles (15) are staggered on the multiple sets of tower plates (14). The feed inlet is staggered and located on the side of the baffle (15) close to the ammonia stripping tower (1). The upper part of the ammonia stripping tower (1) is the rectification section and the lower part is the stripping section. The feed tank (12) is fixedly connected to the feed pipe (121). The end of the feed pipe (121) away from the feed tank (12) is connected to the ammonia stripping tower (1) and is located at the upper end of the stripping section of the ammonia stripping tower (1). The ammonia stripping tower (1) is equipped with a stripping component (2) for fully stripping ammonia nitrogen wastewater.
2. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 1, characterized in that: The stripping assembly (2) includes an inlet pipe (21), a steam regulating valve (22), a first annular steam pipe (23), a second annular steam pipe (24), a connecting pipe (25), and a reflux stripping component (3). One end of the inlet pipe (21) is connected to the outlet of the steam compressor (13), and the other end is located at the upper end of the tower tank (11). The first annular steam pipe (23) is connected to the end of the inlet pipe (21) away from the steam compressor (13), and multiple sets of air outlets are vertically downward at the bottom of the first annular steam pipe (23). One end of the connecting pipe (25) is connected to the inlet pipe (21). 21) Connected, the other end is located in the middle of the stripping section of the ammonia stripping tower (1) and below the tower plate (14). The second annular steam pipe (24) is connected to the end of the connecting pipe (25) away from the inlet pipe (21). The upper part of the second annular steam pipe (24) is inclined upward with multiple sets of air outlet holes. The steam regulating valve (22) is located on the side of the inlet pipe (21) near the ammonia stripping tower (1) and on the connecting pipe (25). The reflux stripping component (3) is located in the rectification section of the ammonia stripping tower (1) and is used to fully strip the refluxed ammonia water.
3. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 2, characterized in that: The reflux stripping unit (3) includes a split pipe (31) and a third annular steam pipe (32). One end of the split pipe (31) is connected to the inlet pipe (21), and the other end is provided with multiple sets of outlets corresponding to the tray (14) of the rectification section in the ammonia stripping tower (1). The third annular steam pipe (32) is provided with multiple sets, and is connected to multiple sets of outlets of the split pipe (31). The third annular steam pipe (32) is located below the tray (14), and the bottom of the third annular steam pipe (32) is provided with a downward air outlet. A split regulating valve (33) is provided on the split pipe (31).
4. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 1, characterized in that: A drive motor (4) is bolted to the outer peripheral wall of the tower tank (11). A rotating rod (41) is fixedly installed on the output end of the drive motor (4). The rotating rod (41) passes through the tower tank (11) and is rotatably installed on the tower tank (11). Multiple sets of stirring blades (42) are fixedly installed on the rotating rod (41).
5. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 1, characterized in that: A shell-and-tube heat exchanger (5) is vertically fixedly installed on the inner top of the ammonia stripping tower (1). A water inlet pipe (51) is connected to the shell side water inlet of the shell-and-tube heat exchanger (5). A plate heat exchanger (6) is fixedly installed between the feed tank (12) and the ammonia stripping tower (1). A water outlet pipe (52) is connected to the high-temperature fluid water inlet of the plate heat exchanger (6) on the shell side water outlet of the shell-and-tube heat exchanger (5). The feed pipe (121) is connected to the low-temperature fluid water inlet and outlet of the plate heat exchanger (6).
6. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 1, characterized in that: The baffles (15) of the stripping section of the ammonia stripping tower (1) are all equipped with spiral downcomers (151) to increase the contact area between steam and ammonia nitrogen wastewater.
7. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 2, characterized in that: A guide pipe (152) is provided on the side of the baffle (15) above the first annular steam pipe (23) and the second annular steam pipe (24) of the distillation section of the ammonia stripping tower (1) near the side wall of the ammonia stripping tower (1).
8. The ammonia nitrogen wastewater negative pressure stripping and ammonia stripping system according to claim 1, characterized in that: The outer walls of the stripping and rectification sections of the ammonia stripping tower (1) are coated with a heat-insulating coating.