Environment-friendly urea emptying cylinder tail gas treatment device

Abstract

The utility model belongs to the technical field of urea tail gas treatment, and discloses an environment-friendly urea emptying cylinder tail gas treatment device which comprises an absorption tower, a spraying assembly is arranged at the top of the absorption tower and comprises a rotating shaft, the rotating shaft is of a hollow structure, and the two ends of the rotating shaft are rotationally connected with the absorption tower respectively; the spoilers are arranged on the outer wall of the rotating shaft, the multiple spoilers are arranged along the circumference of the central axis of the rotating shaft, the spoilers communicate with the rotating shaft, a plurality of spraying holes are formed in the spoilers, and the spraying holes communicate with the rotating shaft; the rotating joint is communicated with the rotating shaft, and the other end of the rotating joint is communicated with a water supply pipe of the absorption tower; according to the scheme, ammonia gas introduced into the absorption tower flows towards the escape port of the absorption tower to push the spoiler to rotate to generate centrifugal force to throw desalted water farther, so that the spraying coverage area is larger; the utility model solves the problem of poor absorption effect caused by the adoption of a fixed nozzle in the existing absorption tower.

Description

Technical Field

[0001] The present invention belongs to the technical field of urea tail gas treatment, and specifically relates to an environmentally friendly urea vent cylinder tail gas treatment device. Background Art

[0002] Referring to a urea venting tube tail gas treatment system with an existing publication (announcement) number of CN117531339A, in the traditional urea production process, the ammonia in the venting main pipe mainly comes from the ammonia in the inert gas discharged from the atmospheric tower and the ammonia volatilized from the urea ammonia tank and the urine tank. If the emission of these ammonia gases is not effectively treated, it will directly lead to environmental pollution.

[0003] Referring to an ammonia absorption device and method with the existing publication number CN111773897A, the device and method include: an absorption tower body, a spray part, a flow regulating pipeline and a control system, wherein an absorption liquid storage chamber is formed at the inner bottom of the absorption tower body, the absorption liquid storage chamber is connected to a first pH monitor, and the first pH monitor is used to collect the pH value of the absorption liquid in the absorption liquid storage chamber; an air inlet is connected to the side wall of the absorption tower body, a first ammonia detector and an intake flow meter are arranged at the air inlet, the first ammonia detector is used to collect the intake ammonia concentration at the air inlet, and the intake flow meter is used to collect the intake flow at the air inlet, and an air outlet is connected to the top of the absorption tower body; the spray part is arranged at the inner top of the absorption tower body; the flow regulating pipeline includes a first pipeline connected between the absorption liquid storage chamber and the spray part, and a variable frequency water pump arranged on the first pipeline; the control system is electrically connected to the first ammonia detector, the intake flow meter, the first pH monitor and the variable frequency water pump respectively.

[0004] The spraying part of the ammonia absorption device adopts a plurality of atomizing nozzles suspended on the inner top of the absorption tower body to achieve the effect of spraying and absorbing the tail gas. However, since the position of the atomizing nozzle is fixed, the spraying range and area of ​​the nozzle are limited, which will cause the ammonia in certain areas of the absorption tower to not be sprayed by water, thereby causing ammonia to escape. If the absorption tower is to be fully covered by spraying, multiple nozzles need to be set up, which is bound to increase the manufacturing and maintenance costs. In addition, during the long-term operation of the fixed nozzle, the spraying efficiency will be reduced due to the clogging of the nozzle by particulate matter in the tail gas, and it needs to be cleaned or replaced regularly, which increases the maintenance cost. Utility Model Content

[0005] The purpose of this scheme is to provide an environmentally friendly urea venting tube tail gas treatment device to solve the problem of poor absorption effect caused by the use of fixed nozzles in existing absorption towers.

[0006] In order to achieve the above object, the present invention provides an environmentally friendly urea venting cylinder tail gas treatment device, comprising an absorption tower, a spray assembly is provided on the top of the absorption tower, and the spray assembly comprises:

[0007] A rotating shaft, wherein the rotating shaft is a hollow structure, and both ends of the rotating shaft are rotatably connected to the absorption tower respectively;

[0008] A spoiler, the spoiler is arranged on the outer wall of the rotating shaft, the spoiler is connected to the rotating shaft, the spoiler is provided with a plurality of spray holes, and the spray holes are connected to the rotating shaft;

[0009] A rotary joint is connected to the rotating shaft, and the other end of the rotary joint is connected to the water supply pipe of the absorption tower.

[0010] The principle of this scheme is that the water supply pipe of the absorption tower sends the external desalted water into the rotating shaft through the rotating joint, then flows into the rotating shaft, and finally sprays out through the spray holes on the spoiler to form an atomization effect. Since the ammonia gas introduced into the absorption tower flows toward the escape port of the absorption tower, it pushes the spoiler plate set on the upper part of the absorption tower to rotate, so that the rotation of the spoiler plate generates centrifugal force, which can throw the desalted water farther, so that the spray coverage area of ​​the desalted water is larger, and the absorption effect of ammonia is better.

[0011] The effects of this solution are as follows: (1) The rising ammonia in the absorption tower is used to drive the spoiler to rotate, which can utilize the energy of the exhaust gas itself, thereby reducing the need for additional power, such as using a motor drive, thereby reducing energy consumption. (2) The centrifugal force generated by the rotation of the spoiler allows the desalted water to be thrown out through the spray hole for a longer distance, increasing the contact area between the desalted water and the ammonia, and improving the efficiency of absorbing ammonia. (3) The spoiler generates a turbulent flow below the escape port of the absorption tower through the rotation of the spoiler, which can increase the residence time of ammonia below the escape port, thereby enhancing the mixing of ammonia and desalted water. (4) In the prior art, the compensation water supply method is used to solve the problem that when the water pump of the absorption tower is delayed or stops working, the water outside the boundary cannot be quickly sent into the tower, and the ammonia in the tower that has not reacted with water escapes from the outlet. By adding this device, the spoiler can still rotate when the water outside the boundary is sent in, thereby increasing the spray absorption effect.

[0012] Furthermore, there are multiple spoilers, and the multiple spoilers are arranged along the circumference of the central axis of the rotating shaft; the spray holes are evenly distributed in an array on the spoilers.

[0013] The principle and effect of this solution are that desalted water is sprayed out from the spray holes on multiple spoilers to form a spray area with a wide coverage, thereby maximizing the contact area with ammonia and improving the absorption efficiency.

[0014] Furthermore, the spray hole is arranged on the front side of the spoiler.

[0015] The principle and effect of this scheme are as follows: (1) Since the spoiler rotates in a clockwise direction, the front of the spoiler first contacts the ammonia below. When the spoiler starts to rotate, the spray holes on the front of the spoiler are first aimed at the ammonia below, so that the ammonia can contact the desalted water during its rise, thereby increasing the absorption reaction rate. (2) This scheme does not set the spray holes on the back of the spoiler. If the spray holes are set on the back, the sprayed desalted water will not be conducive to reacting with the ammonia below first, which will prolong the reaction time between the ammonia and the desalted water and reduce the absorption efficiency.

[0016] Furthermore, it also includes a compensation component, which is used to drive the rotating shaft to rotate when the absorption tower is powered off.

[0017] The principle and effect of this scheme are as follows: In the prior art, the compensation water supply method is adopted to solve the problem that when the water pump of the absorption tower is delayed or stops working, the water outside the boundary cannot be quickly sent into the tower, and the ammonia in the tower that has not reacted with water escapes from the air outlet. If only the water from the outside is sent into the absorption tower, and the spoiler is not rotated, the spraying effect will be unsatisfactory, and the ammonia will still escape due to unreacted reaction. At the same time, due to the power failure of the system, the ammonia sent into the absorption tower will stop being transported, and the unreacted ammonia is mainly concentrated in the unreacted ammonia in the absorption tower. At this time, the ammonia in the tower will cause the upward fluidity of the ammonia to deteriorate due to the lack of new ammonia being sent in, which is not enough to drive the spoiler to rotate. Therefore, a compensation component is set to rotate the spoiler when the absorption tower is powered off, thereby improving the spray atomization absorption effect.

[0018] Furthermore, the compensation component includes a torsion spring passing through the connection point between the rotating shaft and the absorption tower.

[0019] The principle and effect of this scheme is that the rotation of the spoiler drives the torsion spring to deform. When the system is powered off and shut down, the torsion spring drives the spoiler to rotate in the opposite direction. Under the action of external compensating water supply, the spoiler rotates to spray water to absorb the unreacted ammonia in the tower.

[0020] Furthermore, the compensation component includes a driving gear coaxially connected to the rotating shaft and a driven gear meshing with the driving gear, the driven gear is coaxially connected to a generator, the output shaft of the generator is fixedly connected to the driven gear, the generator is electrically connected to an electromagnetic relay, and the electromagnetic relay closes its normally open contacts when power is off.

[0021] The principle and effect of this scheme are: when the system is powered normally, the shaft rotates to drive the driving gear to rotate, the driving gear drives the driven gear to rotate, and the generator generates electricity and stores electricity. After the absorption tower is powered off, the electromagnetic relay is powered off to close its normally open contacts, the generator discharges to rotate the output shaft, and drives the spoiler to rotate.

[0022] Furthermore, it also includes a cleaning component, which includes a movable plate slidably arranged in the spoiler and a driving unit for driving the movable plate, the movable plate is provided with a protrusion matching the number of spray holes, the protrusion is arranged in cooperation with the spray holes, and the movable plate is connected to a tension spring for resetting the movable plate.

[0023] The principle and effect of this scheme are as follows: (1) The particulate matter contained in the ammonia tail gas includes but is not limited to fly ash, dust, unburned carbon particles, sulfates, chlorides and other by-products generated by the process. These particulate matter can easily move with the airflow during the exhaust gas discharge process and eventually block the spray hole. Therefore, a cleaning component is set to clean the spray hole. (2) The driving component drives the movable plate to move, thereby driving the bump on the movable plate to collide with the spray hole, thereby cleaning the impurities and dust in the spray hole and avoiding the blockage of the spray hole.

[0024] Furthermore, the driving unit includes a first wedge block and a second wedge block matching the first wedge block, the first wedge block is arranged on the movable plate, the second wedge block is connected to a spring, and the free end of the spring is connected to the inner wall of the spoiler.

[0025] The principle and effect of this scheme are as follows: (1) When the spoiler rotates to the highest point, the second wedge block slides under the action of its own weight until it contacts the first wedge block and pushes the first wedge block to move toward the spray hole, so that the protrusion is inserted into the spray hole to clean the spray hole. When the spoiler rotates to the lowest point, it slides back under the action of the second wedge block's own weight, and the protrusion and the movable plate lose the contact with the second wedge block and are reset under the drive of the tension spring. (2) During the ammonia treatment process, due to the rotation of the spoiler, ammonia accumulates more in front of the spoiler, and ammonia absorption mainly occurs in the area with the largest gas-liquid contact area, which is usually in the front of the spoiler. That is, the side of the spoiler facing the airflow. When the spoiler turns to the back, that is, away from the airflow direction, spraying water at this time will not only not increase the ammonia absorption efficiency, but will lead to a waste of water resources, because there is not enough gas in contact with water for effective absorption. (3) During the process of the spoiler rotating from the highest point to the lowest point, the spoiler is located at the back. Therefore, when the spoiler is located at the back, it is not necessary to spray water on it to avoid wasting water. At this time, the second wedge block is in conflict with the first wedge block during this process, and the projection blocks the spray hole to prevent desalted water from spraying out and waste water.

[0026] Furthermore, the end of the protrusion closest to the spray hole is conical, and the bottom edge of the first wedge-shaped block is not less than the inner diameter of the spray hole.

[0027] The principle and effect of this solution are: the conical convex block is used to clean the dust in the spray hole, and the bottom edge of the convex block is not less than the inner diameter of the spray hole, so that the convex block can block the spray hole.

[0028] Furthermore, a slide groove and a limit groove are provided in the spoiler, the movable plate is slidably connected to the slide groove, and the second wedge block is slidably connected to the limit groove.

[0029] The principle and effect of this solution are that the sliding groove and the limiting groove provide positioning and guiding functions for the movement of the movable plate and the second wedge block respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the environmentally friendly urea venting cylinder tail gas treatment device of the utility model;

[0031] Figure 2 This is a perspective view of the environmentally friendly urea venting cylinder tail gas treatment device of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the spray assembly of the utility model;

[0033] Figure 4 The structure diagram of the compensation component of the utility model is shown in FIG. Figure 1 ;

[0034] Figure 5 The structure diagram of the compensation component of the utility model is shown in FIG. Figure 2 ;

[0035] Figure 6 It is a schematic diagram of the structure of the cleaning component of the utility model.

[0036] The names of the corresponding marks in the accompanying drawings are: absorption tower 1, spray assembly 2, rotating shaft 21, spoiler 22, spray hole 221, rotary joint 23, compensation assembly 3, driving gear 31, driven gear 32, generator 33, cleaning assembly 4, movable plate 41, drive unit 42, first wedge block 421, second wedge block 422, spring 423, and protrusion 43. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the concept and technical effects of the utility model in combination with the embodiments, so as to fully understand the purpose, features and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model:

[0038] Example:

[0039] See also Figure 1-Figure 3An environmentally friendly urea venting cylinder tail gas treatment device comprises an absorption tower 1, a spray assembly 2 is arranged at the top of the absorption tower 1 near the bottom of the escape port of the absorption tower 1, the spray assembly 2 comprises a horizontally arranged rotating shaft 21, the rotating shaft 21 is a hollow structure, one end of the rotating shaft 21 is rotatably connected to the inner wall of the absorption tower 1 through a bearing, the other end of the rotating shaft 21 is connected to a rotating joint 23, the other end of the rotating joint 23 extends out of the absorption tower 1 and is connected to the water supply pipe 11 of the absorption tower 1, a plurality of spoilers 22 are evenly arranged along the central axis of the rotating shaft 21, the spoilers 22 are connected to the rotating shaft 21, and a plurality of spray holes 221 are evenly distributed on the front of the spoiler 22, and the spray holes 221 are connected to the spoiler 22. When working, the water supply pipe 11 of the absorption tower 1 delivers external desalted water into the rotating shaft 21 through the rotating joint 23, then flows into the rotating shaft 21, and finally sprays out through the spray holes 221 on the spoiler 22 to form an atomization effect. Since the ammonia gas introduced into the absorption tower 1 flows toward the escape port of the absorption tower 1, the spoiler 22 disposed on the upper portion of the absorption tower 1 is pushed to rotate, so that the spoiler 22 rotates to generate centrifugal force, and the desalted water can be thrown farther, so that the spray coverage area of ​​the desalted water is larger, and the absorption effect of the ammonia gas is better. Since the spoiler 22 rotates in a clockwise direction, the front of the spoiler 22 first contacts the ammonia gas below. When the spoiler 22 starts to rotate, the spray hole 221 on the front of the spoiler 22 is first aligned with the ammonia gas below, so that the ammonia gas can contact the desalted water during the rising process, thereby increasing the rate of the absorption reaction.

[0040] See also Figure 4 and Figure 5 , also includes a compensation component 3. In the prior art, a compensation water supply method is adopted to solve the problem that when the water pump of the absorption tower 1 is delayed or stops working, the water outside the boundary cannot be quickly sent into the tower, and the ammonia in the tower that has not reacted with water escapes from the air outlet. If only the water from the outside is sent into the absorption tower 1, and the spoiler 22 is not rotated, the spraying effect will be unsatisfactory, and the ammonia will still escape due to unreacted reaction. At the same time, due to the power failure of the system, the ammonia sent into the absorption tower 1 will stop being transported, and the unreacted ammonia is mainly concentrated in the unreacted ammonia in the absorption tower 1. At this time, the ammonia in the tower will cause the upward fluidity of the ammonia to deteriorate because there is no new ammonia sent in, which is not enough to drive the spoiler 22 to rotate.

[0041] The compensation component 3 is a torsion spring that is inserted into the connection point between the rotating shaft 21 and the absorption tower 1 (the rotation connection point between the rotating shaft and the absorption tower 1). The torsion spring is deformed by the rotation of the spoiler 22. When the system is powered off and shut down, the torsion spring drives the spoiler 22 to rotate in the opposite direction. Under the action of external compensation water supply, the spoiler 22 rotates to spray water to absorb the unreacted ammonia in the absorption tower 1.

[0042] The compensation assembly 3 includes a driving gear 31 coaxially connected to the rotating shaft 21 and a driven gear 32 meshing with the driving gear 31, the driven gear 32 is coaxially connected to a generator 33, the output shaft of the generator 33 is fixedly connected to the driven gear, the generator 33 is electrically connected to an electromagnetic relay, and its normally open contacts are closed when the electromagnetic relay is powered off. When the system is powered normally, the rotating shaft 21 rotates to drive the driving gear 31 to rotate, the driving gear 31 drives the driven gear 32 to rotate, and the generator 33 generates electricity and stores electricity. After the absorption tower 1 is powered off, the electromagnetic relay is powered off to close its normally open contacts, and the generator 33 discharges to rotate the output shaft 21, thereby driving the spoiler 22 to rotate.

[0043] See also Figure 6 , and also includes a cleaning component 4, which includes a movable plate 41 slidably arranged in the spoiler 22 and a driving unit 42 for driving the movable plate 41. A slide groove is provided in the spoiler 22, and the movable plate 41 is slidably connected to the slide groove. The slide groove provides positioning and guiding functions for the movable plate 41. A protrusion 43 matching the number of the spray holes 221 is provided on the movable plate 41. The end of the protrusion 43 closest to the spray hole 221 is conical, and the bottom side of the protrusion 43 is not less than the inner diameter of the spray hole 221. The protrusion 43 is arranged in cooperation with the spray hole 221. The conical protrusion 43 is used to clean the dust accumulated in the spray hole 221. The bottom edge of the block 43 is not less than the inner diameter of the spray hole 221, so that the protrusion 43 can block the spray hole. The movable plate 41 is connected to a tension spring for resetting the movable plate 41. The driving unit 42 includes a first wedge block 421 and a second wedge block 422 matched with the first wedge block 421. The first wedge block 421 is arranged on the movable plate 41. The second wedge block 422 is connected to a spring 423. The free end of the spring 423 is connected to the inner wall of the spoiler 22. A limiting groove is provided in the spoiler 22. The second wedge block 422 is slidably connected to the limiting groove. The limiting groove provides a guiding effect for the movement of the second wedge block 422. When the spoiler 22 rotates to the highest point, the second wedge block 422 slides to contact the first wedge block 421 under the action of its own gravity, and pushes the first wedge block 421 to move toward the spray hole 221, so that the protrusion 43 is inserted into the spray hole 221 to clean the spray hole 221. When the spoiler 22 rotates to the lowest point, it slides back to its original position under the action of the second wedge block 422 , and the protrusion 43 and the movable plate 41 lose the resistance of the second wedge block 422 and are returned to their original position driven by the tension spring.

[0044] During the ammonia treatment process, due to the rotation of the spoiler 22, ammonia is more accumulated in front of the spoiler 22, and ammonia absorption mainly occurs in the area with the largest gas-liquid contact area, and this area is usually in the front of the spoiler 22. That is, the side of the spoiler 22 facing the airflow. When the spoiler 22 turns to the back, that is, away from the airflow direction, spraying water at this time will not only not increase the absorption efficiency of ammonia, but will lead to a waste of water resources, because there is not enough gas to contact with water for effective absorption at this time. In the process of the spoiler 22 rotating from the highest point to the lowest point, the spoiler 22 is located at the back. Therefore, when the spoiler 22 is located at the back, it is not necessary to spray water on it to avoid wasting water. At this time, the second wedge block 422 is just in a conflicting state with the first wedge block 421 in this process, and the projection 43 is used to block the spray hole 221, thereby avoiding the spraying of desalted water and avoiding the waste of water.

[0045] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An environmentally friendly urea venting cylinder tail gas treatment device, comprising an absorption tower (1), wherein a spray assembly (2) is provided on the top of the absorption tower (1), characterized in that: The spray assembly (2) comprises: A rotating shaft (21), wherein the rotating shaft (21) is a hollow structure, and both ends of the rotating shaft (21) are respectively rotatably connected to the absorption tower (1); a spoiler (22), the spoiler (22) being arranged on the outer wall of the rotating shaft (21), the spoiler (22) being in communication with the rotating shaft (21), the spoiler (22) being provided with a plurality of spray holes (221), the spray holes (221) being in communication with the rotating shaft (21); A rotary joint (23), wherein the rotary joint (23) is connected to the rotating shaft (21), and the other end of the rotary joint (23) is connected to the water supply pipe (11) of the absorption tower (1).

2. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 1 is characterized in that: The spoiler plates (22) are provided in a plurality, and the plurality of spoiler plates (22) are all arranged along the circumference of the central axis of the rotating shaft (21); the spray holes (221) are evenly distributed in an array on the spoiler plates (22).

3. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 1 is characterized in that: The spray hole (221) is arranged on the front side of the spoiler (22).

4. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 1 is characterized in that: It also comprises a compensation component (3), wherein the compensation component (3) is used to drive the rotating shaft (21) to rotate when the absorption tower (1) is powered off.

5. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 4 is characterized in that: The compensation component (3) comprises a torsion spring which is passed through the connection point between the rotating shaft (21) and the absorption tower (1).

6. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 4 is characterized in that: The compensation component (3) comprises a driving gear (31) coaxially connected to the rotating shaft (21) and a driven gear (32) meshing with the driving gear (31); the driven gear (32) is coaxially connected to a generator (33); the output shaft of the generator (33) is fixedly connected to the driven gear; the generator (33) is electrically connected to an electromagnetic relay; and the electromagnetic relay closes its normally open contacts when power is off.

7. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 1 is characterized in that: The cleaning assembly (4) further comprises a cleaning component (4), the cleaning component (4) comprising a movable plate (41) slidably arranged in the spoiler (22) and a driving unit (42) for driving the movable plate (41), the movable plate (41) being provided with protrusions (43) matching the number of the spray holes (221), the protrusions (43) being arranged in cooperation with the spray holes (221), and the movable plate (41) being connected to a tension spring for resetting the movable plate (41).

8. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 7 is characterized in that: The driving unit (42) comprises a first wedge block (421) and a second wedge block (422) matched with the first wedge block (421), wherein the first wedge block (421) is arranged on the movable plate (41), and the second wedge block (422) is connected to a spring (423), and the free end of the spring (423) is connected to the inner wall of the spoiler (22).

9. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 8 is characterized in that: The end of the protrusion (43) closest to the spray hole (221) is conical, and the bottom edge of the protrusion (43) is not less than the inner diameter of the spray hole (221).

10. The environmentally friendly urea venting cylinder tail gas treatment device according to claim 8, characterized in that: A sliding groove and a limiting groove are provided in the spoiler (22), the movable plate (41) is slidably connected to the sliding groove, and the second wedge block (422) is slidably connected to the limiting groove.

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