Ammonia distillation system and ammonia distillation process

Abstract

The present invention discloses an ammonia distillation system and an ammonia distillation process in the field of ammonia distillation technology, comprising an ammonia distillation tower, wherein the upper end of the ammonia distillation tower is connected to an exhaust pipe. During the ammonia distillation process of the present invention, water in an evaporation barrel is heated and boiled by the heating pipe to generate water vapor, and the water vapor heats the ammonia water through heat conduction. Part of the water vapor is liquefied in the heat-conducting pipe to generate a large amount of heat to heat the ammonia water. The water vapor stays in the heat-conducting pipe for a period of time under the action of a baffle plate and a sealing plate, which is beneficial to increasing the heat conduction time of the water vapor to the ammonia water in the ammonia distillation tower. When the water vapor and liquefied water in the heat-conducting pipe gradually increase, the baffle plate moves downward and rotates under the action of a guide groove. When the sealing plate is misaligned with the vent, the water vapor and liquefied water flow into the reflux pipe through the vent. The water vapor and liquefied water entering the reflux pipe return to the evaporation barrel after passing through a one-way reflux valve.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia distillation, and in particular to an ammonia distillation system and an ammonia distillation process. Background Art

[0002] Most of the ammonia water formed during the initial cooling process of coke oven gas is used as circulating ammonia water, and the excess is discharged. The discharged part is called residual ammonia water. The residual ammonia water contains harmful impurities such as coal vapor oil, phenol, ammonia, carbon dioxide and hydrogen sulfide, as well as a small amount of germanium-containing compounds. It is the main source of wastewater in the coking industry. The residual ammonia water needs to be treated in three stages: oil removal, ammonia evaporation and biochemical treatment, and then discharged after meeting the standards.

[0003] The existing technology for distilling excess ammonia in the coking industry generally adopts a direct ammonia distillation method. In this direct ammonia distillation method, due to the direct contact between the raw ammonia water and water vapor, all the steam condensate enters the ammonia distillation wastewater system. The steam condensate cannot be recycled, resulting in an increase in wastewater volume, serious energy waste, and an increased load on the biochemical sewage treatment plant. At the same time, the wastewater needs to be cooled before leaving the system, resulting in an increase in cooling water consumption of the wastewater cooler. In addition, precipitation will form in the ammonia water during the ammonia distillation process. During the long production and processing process, the precipitation in the ammonia water will gradually increase, affecting the thermal conductivity of the ammonia water, thereby reducing the effect of ammonia distillation. Summary of the Invention

[0004] The object of the present invention is to provide an ammonia distillation system and an ammonia distillation process to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an ammonia evaporation system, comprising an ammonia evaporation tower, an exhaust pipe connected to the upper end of the ammonia evaporation tower, a water inlet pipe connected to the surface of the ammonia evaporation tower, a plurality of L-shaped receiving plates fixedly connected to the inner surface of the ammonia evaporation tower, a heating mechanism provided on one side of the ammonia evaporation tower, the heating mechanism being used to indirectly heat the ammonia water inside the ammonia evaporation tower by using water vapor, a blocking mechanism provided inside the heating mechanism, the blocking mechanism being used to block the steam generated inside the heating mechanism to increase the residence time of the steam in the ammonia evaporation tower, a cleaning mechanism provided on the surface of the blocking mechanism, the cleaning mechanism being used to clean the precipitation on the surface of the heating mechanism during the ammonia evaporation process, a linkage mechanism provided on the surface of the blocking mechanism, the linkage mechanism being used to drive the cleaning mechanism to perform cleaning through the blocking mechanism during the ammonia evaporation process.

[0006] As a further solution of the present invention, the heating mechanism includes an evaporator, which is arranged on one side of the ammonia evaporation tower. A heating pipe is fixedly connected to the surface of the evaporator, and the heating pipe passes through the evaporator and extends to the inside of the evaporator. An addition port is provided on the surface of the evaporator. An air inlet pipe is connected to the side of the evaporator close to the ammonia evaporation tower. The air inlet pipe is connected to the ammonia evaporation tower at one end close to the ammonia evaporation tower. The air inlet pipe is located inside the ammonia evaporation tower and is fixedly connected to a spiral heat conduction pipe at one end. The heat conduction pipe extends vertically downward to the bottom of the ammonia evaporation tower. A reflux pipe is provided at the lower end of the heat conduction pipe. The reflux pipe passes through the ammonia evaporation tower and extends to above the evaporator. The reflux pipe is connected to the evaporator, and a one-way reflux valve is provided in the reflux pipe.

[0007] As a further solution of the present invention, the blocking mechanism includes a fixing frame, which is fixedly connected to the inner wall surface of the heat conduction pipe, a telescopic rod is fixedly connected to the bottom of the fixing frame, a sealing plate composed of multiple sectors is fixedly connected to the bottom of the telescopic rod, a spring is connected between the sealing plate and the fixing frame, a blocking plate is rotatably connected to the bottom of the sealing plate, a plurality of air vents are provided on the surface of the blocking plate, the sealing plate seals the air vents, the blocking plate is located inside the return pipe, a plurality of spiral guide grooves are provided on the inner wall surface of the return pipe, and the blocking plate slides in the guide grooves.

[0008] As a further solution of the present invention, the linkage mechanism includes a rotating cylinder, which is rotatably connected between the heat conduction pipe and the return pipe. A plurality of sliding grooves are provided on the inner wall surface of the rotating cylinder. A plurality of sliding rods are fixedly connected to the surface of the blocking plate. The plurality of sliding rods slide in the plurality of sliding grooves respectively. The bottoms of the plurality of sliding rods are fixedly connected to the surface of the blocking plate. A hollow support frame is fixedly connected to the surface of the rotating cylinder.

[0009] As a further solution of the present invention, the cleaning mechanism includes a U-shaped fixing rod, which is fixedly connected to the surface of the support frame. A plurality of cleaning brushes are fixedly connected to the surface of the fixing rod close to the heat pipe.

[0010] As a further solution of the present invention, a plurality of impurity removal ports are provided at the bottom of the ammonia evaporation tower, a plurality of connecting rods are fixedly connected to the bottom of the support frame, a sealing disk is fixedly connected to the bottom of the inner wall of the ammonia evaporation tower, a plurality of retention ports are provided on the surface of the sealing disk, a blocking cover is fixedly connected to the position of the plurality of retention ports on the surface of the sealing disk, the blocking cover opens toward the middle side of the ammonia evaporation tower, a plurality of filter holes are provided on the surface of the blocking cover, a plurality of arc covers are fixedly connected to the bottom of the inner wall of the ammonia evaporation tower, the arc cover is used to block the blocking cover opening and the filter holes when the blocking cover moves to the bottom of the arc cover, and the arc cover extends to above the impurity removal port.

[0011] As a further solution of the present invention, a plurality of arc-shaped guide plates are fixedly connected to a side of the fixing rod away from the heat conducting pipe, and the guide plates are arranged obliquely.

[0012] As a further solution of the present invention, a moving rod that moves up and down is provided on the supporting plate, and the moving rod passes through multiple supporting plates. The bottom of the moving rod is fixedly connected to a moving frame composed of L-shaped plates. The moving frame is located under the multiple supporting plates. A spring is connected between the moving frame and the supporting plate. The surface of the moving frame away from the moving rod is fixedly connected to multiple inclined toggle plates. The surface of the moving rod is provided with multiple equidistantly arranged stirring rods, and the multiple stirring rods are respectively located on the surfaces of multiple supporting plates. A spiral groove is opened on the surface of the moving rod, and the multiple stirring rods are all located in the spiral groove.

[0013] As a further solution of the present invention, the moving rod passes through the moving frame and extends to the top of the support frame. The surface of the moving rod located below the moving frame is fixedly connected to a plurality of guide vanes, and the bottom surface of the support frame is fixedly connected to a plurality of arc-shaped vanes.

[0014] An ammonia distillation process, the specific steps of the process are as follows:

[0015] Step 1: During the ammonia evaporation process, ammonia water needs to be injected into the ammonia evaporation tower through the water inlet pipe;

[0016] Step 2: Steam is generated inside the heating mechanism and indirectly heats the ammonia water at the bottom of the ammonia still tower through the heat pipe, so that the ammonia water at the bottom of the ammonia still tower generates steam;

[0017] Step 3: When the heating mechanism heats the ammonia water inside the ammonia distillation tower, the blocking mechanism blocks the water vapor in the heat conduction pipe to increase the time the water vapor stays in the heat conduction pipe and increase the heat conduction time of the water vapor;

[0018] Step 4: When the heating mechanism continues to heat the ammonia solution inside the ammonia still, the blocking mechanism acts on the linkage mechanism, and the linkage mechanism drives the cleaning mechanism to clean the sediment deposited on the surface of the heating mechanism;

[0019] Step 5: The water vapor and ammonia generated in the ammonia still tower will move upward, bypass multiple receiving plates, and then be discharged from the ammonia still tower through the exhaust pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the process of ammonia distillation, the water in the evaporation barrel is heated and boiled by the heating tube to generate water vapor. The water vapor heats the ammonia water through heat conduction. Part of the water vapor is liquefied in the heat conduction tube to generate a large amount of heat to heat the ammonia water. When the ammonia water reaches a certain temperature, it boils to generate water vapor. The ammonia gas in the ammonia water moves to the top of the ammonia distillation tower together with the water vapor and is discharged from the ammonia distillation tower along the exhaust pipe. The water vapor stays in the heat conduction tube for a period of time under the action of the blocking plate and the sealing plate, which is conducive to increasing the heat conduction time of the water vapor to the ammonia water inside the ammonia distillation tower, thereby increasing the heat conduction of the water vapor and improving the heat conductivity. When the water vapor and liquefied water in the heat pipe gradually increase, the blocking plate will move downward and rotate under the action of the guide groove. When the sealing plate and the vent are misaligned, the water vapor and liquefied water will flow into the return pipe through the vent. The water vapor and liquefied water entering the return pipe will pass through the one-way reflux valve and return to the evaporation barrel, which is beneficial to the recycling of water vapor and liquefied water in the evaporation barrel and the heat pipe during the ammonia distillation process, reducing the waste of water resources. In addition, the water vapor generated in the evaporation barrel will not mix with the ammonia water and the water vapor generated by the ammonia water, thereby reducing the discharge of ammonia distillation wastewater and the treatment load of biochemical water in the ammonia distillation process.

[0022] During the ammonia distillation process of the present invention, the rotation of the support frame will drive the connecting rod and the sealing disk to rotate together. When the blocking cover rotates to the outside of the arc cover, the ammonia water inside the ammonia distillation tower will pass through the filter hole in the process of the ammonia water passing through the blocking cover, and the precipitation in the ammonia water will remain in the blocking cover and the retention port. Then, when the sealing disk drives the blocking cover to move to the arc cover position, the blocking cover will gradually move below the arc cover, and the arc cover will block one side of the blocking cover opening and the filter hole. Then, the blocking cover and the retention port will move to the impurity removal port position, and part of the ammonia water and precipitation inside the blocking cover will be discharged from the ammonia distillation tower through the retention port and the impurity removal port, which is beneficial to collect and discharge the precipitation in the ammonia water from the ammonia distillation tower during the ammonia distillation process, thereby ensuring the generation of ammonia gas during the ammonia distillation process and avoiding the accumulation of more precipitation in the ammonia water during the ammonia distillation process, thereby affecting the normal ammonia distillation.

[0023] In the process of ammonia evaporation, the support frame drives the guide plate to move, and the guide plate drives the ammonia water to move toward the bottom of the ammonia evaporation tower, so that the ammonia water can flow around along the bottom of the inner wall of the ammonia evaporation tower, so as to increase the contact between the ammonia water and the heat conduction pipe, thereby ensuring the heating effect of the ammonia water. In addition, the movement of the ammonia water toward the bottom of the ammonia evaporation tower can bring the precipitation in the ammonia water to the blocking cover, which is convenient for cleaning the precipitation in the ammonia water. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a process flow chart of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall structure of the present invention after being cut apart;

[0027] Figure 4 for Figure 3 Schematic diagram of the structure at A in the middle;

[0028] Figure 5 It is a structural schematic diagram of the heating mechanism in the present invention;

[0029] Figure 6 Schematic diagram of the structure of the ammonia still in the present invention after being cut open;

[0030] Figure 7 It is a structural diagram of the cleaning mechanism and the linkage mechanism in the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the reflux pipe after being cut open in the present invention;

[0032] Figure 9 for Figure 8 Schematic diagram of the structure at B in the middle;

[0033] Figure 10 This is a structural diagram of the connection between the fixing frame, the telescopic rod and the sealing plate in the present invention;

[0034] Figure 11 It is a schematic structural diagram of the rotating drum after being cut open in the present invention;

[0035] Figure 12 It is a structural schematic diagram of the connection relationship between the receiving plate, the moving rod and the stirring rod in the present invention.

[0036] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0037] Ammonia distillation tower 1, exhaust pipe 2, water inlet pipe 3, receiving plate 4, evaporation barrel 5, heating pipe 6, addition port 7, air inlet pipe 8, heat conduction pipe 9, reflux pipe 10, one-way reflux valve 11, fixed frame 12, telescopic rod 13, sealing plate 14, blocking plate 15, vent 16, guide groove 17, rotating cylinder 18, slide 19, sliding rod 20, support frame 21, fixed rod 22, cleaning brush 23, impurity removal port 24, connecting rod 25, sealing disk 26, retention port 27, blocking cover 28, filter hole 29, arc cover 30, guide plate 31, moving rod 32, moving frame 33, toggle plate 34, stirring rod 35, spiral groove 36, drainage blade 37, arc blade 38. DETAILED DESCRIPTION

[0038] See also Figures 1-12The present invention provides a technical solution: an ammonia distillation system, comprising an ammonia distillation tower 1, wherein the upper end of the ammonia distillation tower 1 is connected to an exhaust pipe 2, the surface of the ammonia distillation tower 1 is connected to a water inlet pipe 3, a plurality of L-shaped receiving plates 4 are fixedly connected to the inner surface of the ammonia distillation tower 1, a heating mechanism is provided on one side of the ammonia distillation tower 1, the heating mechanism is used to indirectly heat the ammonia water inside the ammonia distillation tower 1 by using water vapor, a blocking mechanism is provided inside the heating mechanism, the blocking mechanism is used to block the steam generated inside the heating mechanism to increase the residence time of the steam in the ammonia distillation tower 1, a cleaning mechanism is provided on the surface of the blocking mechanism, the cleaning mechanism is used to clean the precipitation on the surface of the heating mechanism during the ammonia distillation process, a linkage mechanism is provided on the surface of the blocking mechanism, the linkage mechanism is used to drive the cleaning mechanism to clean through the blocking mechanism during the ammonia distillation process;

[0039] The heating mechanism includes an evaporation barrel 5, which is arranged on one side of the ammonia still tower 1. A heating pipe 6 is fixedly connected to the surface of the evaporation barrel 5. The heating pipe 6 passes through the evaporation barrel 5 and extends into the interior of the evaporation barrel 5. An addition port 7 is provided on the surface of the evaporation barrel 5. An air inlet pipe 8 is connected to the side of the evaporation barrel 5 near the ammonia still tower 1. The air inlet pipe 8 is connected to the ammonia still tower 1 at one end near the ammonia still tower 1. The air inlet pipe 8 is located inside the ammonia still tower 1 and is fixedly connected to a spiral heat conduction pipe 9 at one end. The heat conduction pipe 9 extends to the bottom of the ammonia still tower 1 and then vertically downward. A reflux pipe 10 is provided at the lower end of the heat conduction pipe 9. The reflux pipe 10 passes through the ammonia still tower 1 and extends to the top of the evaporation barrel 5. The reflux pipe 10 is connected to the evaporation barrel 5 and a one-way reflux valve 11 is provided in the reflux pipe 10.

[0040] The blocking mechanism includes a fixing frame 12, which is fixedly connected to the inner wall surface of the heat conducting pipe 9. A telescopic rod 13 is fixedly connected to the bottom of the fixing frame 12. A sealing plate 14 composed of multiple sectors is fixedly connected to the bottom of the telescopic rod 13. A spring is connected between the sealing plate 14 and the fixing frame 12. A blocking plate 15 is rotatably connected to the bottom of the sealing plate 14. A plurality of vents 16 are opened on the surface of the blocking plate 15. The sealing plate 14 seals the vents 16. The blocking plate 15 is located inside the return pipe 10. A plurality of spiral guide grooves 17 are opened on the inner wall surface of the return pipe 10. The blocking plate 15 slides in the guide grooves 17.

[0041] The linkage mechanism includes a rotating cylinder 18, which is rotatably connected between the heat conducting pipe 9 and the return pipe 10. A plurality of slide grooves 19 are provided on the inner wall surface of the rotating cylinder 18. A plurality of sliding rods 20 are fixedly connected to the surface of the blocking plate 15. The plurality of sliding rods 20 slide in the plurality of slide grooves 19 respectively. The bottoms of the plurality of sliding rods 20 are fixedly connected to the surface of the blocking plate 15. A hollow support frame 21 is fixedly connected to the surface of the rotating cylinder 18.

[0042] The cleaning mechanism includes a U-shaped fixed rod 22, which is fixedly connected to the surface of the support frame 21. A plurality of cleaning brushes 23 are fixedly connected to the surface of the fixed rod 22 close to the heat pipe 9;

[0043] In the process of ammonia evaporation, it is necessary to start the ammonia evaporation system first, and inject ammonia water into the ammonia evaporation tower 1 through the water inlet pipe 3. The ammonia water will flow along the surface of the receiving plate 4 to the bottom of the ammonia evaporation tower 1. At the same time, the heating pipe 6 will heat the water in the evaporation barrel 5, and boil it to generate water vapor. The water vapor will enter the heat pipe 9 inside the ammonia evaporation tower 1 through the air inlet pipe 8. The water vapor will move to the ammonia water at the bottom of the ammonia evaporation tower 1 through the heat pipe 9. The water vapor will heat the ammonia water through heat conduction. Part of the water vapor will liquefy in the heat pipe 9 to generate a large amount of heat to heat the ammonia water. After heating for a period of time, the ammonia water in the ammonia evaporation tower 1 will boil and generate water vapor when it reaches a certain temperature. The ammonia gas in the ammonia solution will move to the top of the ammonia still 1 along with the water vapor and be discharged from the ammonia still 1 along the exhaust pipe 2. After the water vapor in the evaporation barrel 5 enters the heat pipe 9, it will stay in the heat pipe 9 for a period of time under the action of the baffle plate 15 and the sealing plate 14, which is beneficial to increase the heat conduction time of the water vapor to the ammonia solution inside the ammonia still 1, thereby increasing the heat conduction of the water vapor and improving the thermal conductivity. In the process of heating the ammonia solution inside the ammonia still 1, the water vapor and liquefied water inside the heat pipe 9 will gradually increase. The water vapor and liquefied water will act on the baffle plate 15 to move downward in the heat pipe 9, the telescopic rod 13 will extend, and the baffle plate 15 will be under the action of the guide groove 17. When the sealing plate 14 is misaligned with the vent 16, the water vapor and liquefied water above the blocking plate 15 will flow into the reflux pipe 10 through the vent 16. The water vapor and liquefied water entering the reflux pipe 10 will return to the evaporation barrel 5 after passing through the one-way reflux valve 11, which is beneficial to the recycling of the water vapor and liquefied water in the evaporation barrel 5 and the heat conduction pipe 9 during the ammonia steaming process, thereby reducing the waste of water resources. In addition, the water vapor generated in the evaporation barrel 5 will not mix with the ammonia water and the water vapor generated by the ammonia water, thereby reducing the discharge of ammonia steaming wastewater and reducing the processing load of biochemical water in the ammonia steaming process. In the process of the blocking plate 15 moving downward, the blocking plate 15 will be in the guide groove 17. Under the action of rotation, the blocking plate 15 will drive multiple sliding rods 20 to rotate together with the rotating cylinder 18, the sliding rods 20 will slide in the slide groove 19, and the rotating cylinder 18 will drive the support frame 21 to rotate together, and the support frame 21 will drive the fixed rod 22 and multiple cleaning brushes 23 to rotate together. During the rotation process, the cleaning brush 23 will clean the precipitation on the surface of the heat conducting tube 9, which is beneficial to cleaning the precipitation deposited on the surface of the heat conducting tube 9, thereby ensuring the heat conduction efficiency of the water vapor inside the heat conducting tube 9 to the ammonia water inside the ammonia distillation tower 1, and avoiding the precipitation generated in the ammonia water during the ammonia distillation process from being deposited on the surface of the heat conducting tube 9, thereby affecting the heat transfer efficiency of the heat conducting tube 9 and increasing the ammonia distillation time.

[0044] During the ammonia evaporation process, the precipitation generated in the ammonia water inside the ammonia evaporation tower 1 will gradually increase, affecting the evaporation of the ammonia water. As a further solution of the present invention, a plurality of impurity removal ports 24 are provided at the bottom of the ammonia evaporation tower 1, a plurality of connecting rods 25 are fixedly connected to the bottom of the supporting frame 21, and a sealing disk 26 is fixedly connected to the bottom of the inner wall of the ammonia evaporation tower 1. A plurality of retention ports 27 are provided on the surface of the sealing disk 26, and a blocking cover 28 is fixedly connected to the surface of the sealing disk 26 corresponding to the positions of the plurality of retention ports 27. The blocking cover 28 opens toward one side in the middle of the ammonia evaporation tower 1, and a plurality of filter holes 29 are provided on the surface of the blocking cover 28. A plurality of arc covers 30 are fixedly connected to the bottom of the inner wall of the ammonia evaporation tower 1. The arc cover 30 is used to block the opening of the blocking cover 28 and the filter holes 29 when the blocking cover 28 moves below the arc cover 30, and the arc cover 30 extends above the impurity removal port 24;

[0045] When the sealing plate 26 drives the blocking cover 28 to move to the position of the arc cover 30, the blocking cover 28 will gradually move below the arc cover 30, and the arc cover 30 will block the opening side of the blocking cover 28 and the filter hole. Then, the blocking cover 28 and the retention port 27 will move to the position of the impurity removal port 24, and part of the ammonia water and precipitation inside the blocking cover 28 will be discharged from the ammonia still 1 through the retention port 27 and the impurity removal port 24, which is beneficial to collect and discharge the precipitation in the ammonia water during the ammonia still 1, thereby ensuring the generation of ammonia gas during the ammonia still 1 process and avoiding the accumulation of more precipitation in the ammonia water during the ammonia still 1 process, thereby affecting the normal ammonia still 1 process.

[0046] As a further solution of the present invention, a plurality of arc-shaped guide plates 31 are fixedly connected to the side of the fixing rod 22 away from the heat pipe 9, and the guide plates 31 are arranged obliquely;

[0047] During the ammonia evaporation process, when the support frame 21 drives the guide plate 31 to move, the guide plate 31 will act to move the ammonia water toward the bottom of the ammonia evaporation tower 1, so that the ammonia water can flow around along the bottom of the inner wall of the ammonia evaporation tower 1 to increase the contact between the ammonia water and the heat pipe 9, thereby ensuring the heating effect of the ammonia water. In addition, the movement of the ammonia water toward the bottom of the ammonia evaporation tower 1 can bring the precipitate in the ammonia water to the blocking cover 28, thereby facilitating the cleaning of the precipitate in the ammonia water.

[0048] During the ammonia evaporation process, only the surface of the ammonia water on the surface of the receiving plate 4 is heated, and the ammonia evaporation effect is poor. As a further solution of the present invention, a moving rod 32 that moves up and down is provided on the receiving plate 4. The moving rod 32 passes through multiple receiving plates 4. The bottom of the moving rod 32 is fixedly connected to a moving frame 33 composed of L-shaped plates. The moving frame 33 is located below the multiple receiving plates 4. A spring is connected between the moving frame 33 and the receiving plate 4. A plurality of inclined toggle plates 34 are fixedly connected to the surface of the moving frame 33 away from the moving rod 32. A plurality of equidistantly arranged stirring rods 35 are provided on the surface of the moving rod 32. The plurality of stirring rods 35 are respectively located on the surfaces of the multiple receiving plates 4. A spiral groove 36 is opened on the surface of the moving rod 32, and the plurality of stirring rods 35 are all located in the spiral groove 36.

[0049] During the ammonia evaporation process, the support frame 21 will drive the fixed rod 22 and the guide plate 31 to move together. The movement of the guide plate 31 will push the toggle plate 34 to move upward. The toggle plate 34 will drive the movable frame 33 and the movable rod 32 to move upward. The stirring rod 35 will rotate around the movable rod 32 under the action of the spiral groove 36. The stirring rod 35 can stir the ammonia water on the surface of the receiving plate 4, thereby increasing the heating area of the ammonia water. Stirring the ammonia water can accelerate the evaporation of ammonia gas in the ammonia water and reduce the ammonia evaporation time.

[0050] During the ammonia evaporation process, the ammonia solution in the ammonia evaporation tower 1 is difficult to flow to the bottom of the ammonia evaporation tower 1 after boiling. As a further solution of the present invention, a movable rod 32 passes through the movable frame 33 and extends to the top of the support frame 21. A plurality of guide vanes 37 are fixedly connected to the surface of the movable rod 32 below the movable frame 33, and a plurality of arc-shaped vanes 38 are fixedly connected to the bottom surface of the support frame 21.

[0051] During the ammonia evaporation process, after the ammonia water in the ammonia evaporation tower 1 boils, the ammonia water near the heat pipe 9 will surge around. When the ammonia water flows to the middle position of the ammonia evaporation tower 1, the ammonia water will move downward under the action of the drainage blades 37. Then the ammonia water will pass through the support frame 21 and flow to the bottom of the ammonia evaporation tower 1 under the action of the arc-shaped blades 38 to ensure the flow of the ammonia water, so that the ammonia water can circulate to the vicinity of the heat pipe 9 after passing through the blocking cover 28. On the one hand, it ensures the heated evaporation of the ammonia water, and on the other hand, it can collect and clean the precipitate in the ammonia water.

[0052] An ammonia distillation process, the specific steps of the process are as follows:

[0053] Step 1: During the ammonia evaporation process, ammonia water needs to be injected into the ammonia evaporation tower 1 through the water inlet pipe 3;

[0054] Step 2: Steam is generated inside the heating mechanism and is used to indirectly heat the ammonia water at the bottom of the ammonia still 1 through the heat pipe 9, so that the ammonia water at the bottom of the ammonia still 1 generates steam;

[0055] Step 3: When the heating mechanism heats the ammonia solution in the ammonia still 1, the blocking mechanism blocks the water vapor in the heat pipe 9 to increase the time the water vapor stays in the heat pipe 9 and the heat conduction time of the water vapor;

[0056] Step 4: When the heating mechanism continues to heat the ammonia solution inside the ammonia still 1, the blocking mechanism acts on the linkage mechanism, and the linkage mechanism drives the cleaning mechanism to clean the precipitates deposited on the surface of the heating mechanism;

[0057] Step 5: The water vapor and ammonia gas generated in the ammonia still 1 will move upward, bypass the multiple receiving plates 4, and then be discharged from the ammonia still 1 through the exhaust pipe 2.

Claims

1. An ammonia distillation system, comprising an ammonia distillation tower (1), characterized in that: The upper end of the ammonia evaporation tower (1) is connected to an exhaust pipe (2), the surface of the ammonia evaporation tower (1) is connected to a water inlet pipe (3), the inner surface of the ammonia evaporation tower (1) is fixedly connected to a plurality of L-shaped receiving plates (4), a heating mechanism is provided on one side of the ammonia evaporation tower (1), the heating mechanism is used to indirectly heat the ammonia water inside the ammonia evaporation tower (1) by using water vapor, a blocking mechanism is provided inside the heating mechanism, the blocking mechanism is used to block the steam generated inside the heating mechanism to increase the residence time of the steam in the ammonia evaporation tower (1), a cleaning mechanism is provided on the surface of the blocking mechanism, the cleaning mechanism is used to clean the precipitation on the surface of the heating mechanism during the ammonia evaporation process, a linkage mechanism is provided on the surface of the blocking mechanism, the linkage mechanism is used to drive the cleaning mechanism to clean during the ammonia evaporation process through the blocking mechanism; The heating mechanism comprises an evaporation barrel (5), the evaporation barrel (5) is arranged on one side of the ammonia evaporation tower (1), a heating pipe (6) is fixedly connected to the surface of the evaporation barrel (5), the heating pipe (6) passes through the evaporation barrel (5) and extends to the inside of the evaporation barrel (5), a adding port (7) is provided on the surface of the evaporation barrel (5), the evaporation barrel (5) is connected to an air inlet pipe (8) on the side close to the ammonia evaporation tower (1), and the air inlet pipe (8) is connected to the ammonia evaporation tower (1) at one end thereof. ), the air inlet pipe (8) is located inside the ammonia evaporation tower (1), one end of which is fixedly connected to a spiral heat conduction pipe (9), the heat conduction pipe (9) extends to the bottom of the ammonia evaporation tower (1) and then extends vertically downward, a reflux pipe (10) is provided at the lower end of the heat conduction pipe (9), the reflux pipe (10) passes through the ammonia evaporation tower (1) and then extends to the top of the evaporation barrel (5), the reflux pipe (10) is connected to the evaporation barrel (5), and a one-way reflux valve (11) is provided in the reflux pipe (10); The blocking mechanism comprises a fixing frame (12), the fixing frame (12) being fixedly connected to the inner wall surface of the heat conducting pipe (9), a telescopic rod (13) being fixedly connected to the bottom of the fixing frame (12), a sealing plate (14) consisting of a plurality of fan-shaped parts being fixedly connected to the bottom of the telescopic rod (13), a spring being connected between the sealing plate (14) and the fixing frame (12), a blocking plate (15) being rotatably connected to the bottom of the sealing plate (14), a plurality of vents (16) being provided on the surface of the blocking plate (15), the sealing plate (14) sealing the vents (16), the blocking plate (15) being located inside the return pipe (10), a plurality of spiral guide grooves (17) being provided on the inner wall surface of the return pipe (10), and the blocking plate (15) sliding in the guide grooves (17).

2. The ammonia distillation system according to claim 1, characterized in that: The linkage mechanism includes a rotating cylinder (18), which is rotatably connected between the heat conducting pipe (9) and the return pipe (10), and a plurality of sliding grooves (19) are provided on the inner wall surface of the rotating cylinder (18). A plurality of sliding rods (20) are fixedly connected to the surface of the blocking plate (15), and the plurality of sliding rods (20) slide in the plurality of sliding grooves (19) respectively. The bottoms of the plurality of sliding rods (20) are fixedly connected to the surface of the blocking plate (15). A hollow support frame (21) is fixedly connected to the surface of the rotating cylinder (18).

3. The ammonia distillation system according to claim 2, characterized in that: The cleaning mechanism comprises a U-shaped fixing rod (22), the fixing rod (22) being fixedly connected to the surface of the support frame (21), and a plurality of cleaning brushes (23) being fixedly connected to the surface of the fixing rod (22) on one side close to the heat conducting pipe (9).

4. The ammonia distillation system according to claim 2, characterized in that: The bottom of the ammonia evaporation tower (1) is provided with a plurality of impurity removal openings (24), the bottom of the support frame (21) is fixedly connected with a plurality of connecting rods (25), the bottoms of the plurality of connecting rods (25) are fixedly connected with a sealing disk (26), the sealing disk (26) is fitted with the bottom of the inner wall of the ammonia evaporation tower (1), the surface of the sealing disk (26) is provided with a plurality of retention openings (27), the surface of the sealing disk (26) is fixedly connected with a blocking cover (28) at positions corresponding to the plurality of retention openings (27), the blocking cover (28) is opened toward one side of the middle of the ammonia evaporation tower (1), the surface of the blocking cover (28) is provided with a plurality of filter holes (29), the bottom of the inner wall of the ammonia evaporation tower (1) is fixedly connected with a plurality of arc covers (30), the arc covers (30) are used to block the opening of the blocking cover (28) and the filter holes (29) when the blocking cover (28) moves to the bottom of the arc cover (30), and the arc cover (30) extends to the top of the impurity removal opening (24).

5. The ammonia distillation system according to claim 3, characterized in that: A plurality of arc-shaped guide plates (31) are fixedly connected to the side of the fixing rod (22) away from the heat conducting pipe (9), and the guide plates (31) are arranged at an angle.

6. The ammonia distillation system according to claim 5, characterized in that: The receiving plate (4) is provided with a moving rod (32) that moves up and down, and the moving rod (32) passes through the plurality of receiving plates (4). The bottom of the moving rod (32) is fixedly connected to a moving frame (33) composed of an L-shaped plate, and the moving frame (33) is located below the plurality of receiving plates (4). A spring is connected between the moving frame (33) and the receiving plate (4). The surface of the moving frame (33) away from the moving rod (32) is fixedly connected to a plurality of tilted toggle plates (34). The surface of the moving rod (32) is provided with a plurality of stirring rods (35) arranged at equal distances, and the plurality of stirring rods (35) are respectively located on the surfaces of the plurality of receiving plates (4). The surface of the moving rod (32) is provided with a spiral groove (36), and the plurality of stirring rods (35) are all located in the spiral groove (36).

7. The ammonia distillation system according to claim 6, characterized in that: The movable rod (32) passes through the movable frame (33) and extends to the top of the support frame (21); a surface of the movable rod (32) located below the movable frame (33) is fixedly connected to a plurality of guide vanes (37); and a bottom surface of the support frame (21) is fixedly connected to a plurality of arc-shaped vanes (38).

8. An ammonia distillation process, applicable to an ammonia distillation system according to any one of claims 1 to 7, characterized in that: The specific steps of this process are as follows: Step 1: During the ammonia evaporation process, ammonia water needs to be injected into the ammonia evaporation tower (1) through the water inlet pipe (3); Step 2: Steam is generated inside the heating mechanism and indirectly heats the ammonia water at the bottom of the ammonia evaporation tower (1) through the heat pipe (9), so that the ammonia water at the bottom of the ammonia evaporation tower (1) generates steam; Step 3: When the heating mechanism heats the ammonia solution in the ammonia evaporation tower (1), the blocking mechanism blocks the water vapor in the heat conducting pipe (9) to increase the time the water vapor stays in the heat conducting pipe (9) and thus increase the heat conduction time of the water vapor; Step 4: When the heating mechanism continues to heat the ammonia solution inside the ammonia evaporation tower (1), the blocking mechanism acts on the linkage mechanism, and the linkage mechanism drives the cleaning mechanism to clean the sediment deposited on the surface of the heating mechanism; Step 5: The water vapor and ammonia generated in the ammonia evaporation tower (1) will move upward, bypass the multiple receiving plates (4), and then be discharged from the ammonia evaporation tower (1) through the exhaust pipe (2).

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