Equipment for preparing ammonia from urea

Abstract

The utility model relates to the technical field of ammonia gas preparation, and discloses urea ammonia preparation equipment which comprises a pyrolysis bin, one side of the pyrolysis bin is rotatably communicated with a gas conveying bin, the inner wall of the gas conveying bin is fixedly connected with a fixed inner gear ring, the bottom of the pyrolysis bin is provided with two groups of supporting frames, the two groups of supporting frames are both rotatably connected with the pyrolysis bin, and the fixed inner gear ring is fixedly connected with the pyrolysis bin. Through the arrangement of the fixed sleeve rod, the rotating gear, the transmission gear and the cleaning roller, when the transmission belt wheel rotates, the fixed sleeve rod drives the rotating gear to rotate through the transmission gear, and due to the arrangement of the fixed inner gear ring, the rotating gear revolves along the inner teeth of the fixed inner gear ring while rotating, so that the cleaning roller is cleaned. And then the cleaning roller is driven to revolve along the inner wall of the pyrolysis bin and rotate at the same time, so that the effect of cleaning the inner wall of the pyrolysis bin is achieved, meanwhile, the cleaning roller drives the exhaust pipe to rotate through the sealing plate, and then hot air can be more evenly dispersed into the pyrolysis bin.

Description

Technical Field

[0001] This utility model relates to the field of ammonia preparation technology, and more specifically, to a urea-to-ammonia production device. Background Technology

[0002] In the denitrification technology of thermal power plants, selective catalytic reduction (SCR) denitrification technology is widely used. In terms of the use of reducing agents, urea has certain advantages over liquid ammonia and ammonia water. Each generator unit's denitrification system is equipped with a urea ammonia production system. Urea ammonia production technology is mainly divided into two types: urea hydrolysis and urea pyrolysis. The traditional urea pyrolysis ammonia production process uses hot air as a heat source to produce ammonia gas through pyrolysis at around 650°C and atmospheric pressure. The traditional urea pyrolysis ammonia production process system is safe, operates stably, and can meet the requirements of SCR denitrification.

[0003] Before pyrolyzing urea, it needs to be dissolved to produce a urea solution, which is then pyrolyzed. During the pyrolysis of the urea solution to produce ammonia, certain impurities and tiny particles are present in the solution. These impurities are difficult to decompose through pyrolysis, resulting in a large amount of non-decomposable impurities remaining on the inner wall of the pyrolysis furnace after pyrolysis. This affects the results of subsequent pyrolysis. To solve the problem of impurities adhering to the inner wall of the pyrolysis furnace and affecting the pyrolysis effect, we propose a urea-to-ammonia equipment. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a urea-to-ammonia equipment, which has the advantage of cleaning the inner wall of the pyrolysis furnace.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a urea-to-ammonia production device, comprising:

[0006] The pyrolysis chamber has a gas delivery chamber rotatably connected to one side. A fixed internal toothed ring is fixedly connected to the inner wall of the gas delivery chamber. Two sets of support frames are provided at the bottom of the pyrolysis chamber, and both sets of support frames are rotatably connected to the pyrolysis chamber.

[0007] A cleaning mechanism, wherein the cleaning mechanism is located inside the gas transmission chamber;

[0008] The cleaning mechanism includes a fixed sleeve rod that rotatably passes through one side of the pyrolysis chamber. A transmission pulley is fixedly connected to the fixed sleeve rod. A fixed plate is rotatably sleeved on the fixed sleeve rod and rotatably connected to the inner wall of the pyrolysis chamber. A rotating shaft is rotatably connected to the fixed plate. A rotating gear is fixedly connected to one end of the rotating shaft. The rotating gear meshes with a fixed internal gear ring. A transmission gear meshes with the rotating gear and is fixedly connected to the fixed sleeve rod. A cleaning roller is fixedly connected to the rotating gear and contacts the inner wall of the pyrolysis chamber. A sealing plate rotatably passes through the cleaning roller and rotatably connects to the inner wall of the gas delivery chamber. An exhaust pipe is fixedly passed through the sealing plate and has several sets of exhaust holes.

[0009] As a preferred embodiment of this utility model, a gas delivery pipe is fixedly connected to the gas delivery chamber, and a valve is installed on the gas delivery pipe.

[0010] As a preferred technical solution of this utility model, a drive motor is fixedly installed on a set of support frames, and a drive shaft is fixedly connected to the output end of the drive motor. The drive shaft rotatably passes through the pyrolysis chamber, and a drive pulley is fixedly sleeved on the drive shaft. A transmission toothed belt meshes between the drive pulley and the transmission pulley.

[0011] As a preferred embodiment of this utility model, a drive gear is fixedly connected to one end of the drive shaft, and a drive external gear ring is meshed on the drive gear. The drive external gear ring is fixedly sleeved with the outer surface of the pyrolysis chamber.

[0012] As a preferred embodiment of this utility model, a sealing cover is provided on one side of the pyrolysis chamber, and several sets of bolts are threaded onto the sealing cover. The sealing cover and the pyrolysis chamber are fixed together by bolts.

[0013] As a preferred embodiment of this utility model, a material conveying pipe is rotatably inserted through the sealing cover, and several sets of nozzles are connected to the material conveying pipe.

[0014] As a preferred embodiment of this utility model, a pressure gauge is fixedly installed on the sealing cover, and one end of the pressure gauge passes through the sealing cover and extends into the interior of the pyrolysis chamber.

[0015] As a preferred embodiment of this utility model, a slag discharge pipe is fixedly connected to the pyrolysis chamber, and a valve is fixedly installed on the slag discharge pipe.

[0016] As a preferred technical solution of this utility model, a fixing ring plate is fixedly connected to the inner wall of the pyrolysis chamber, and an annular groove is opened on the fixing ring plate. One end of the cleaning roller and the exhaust pipe abut against the inner wall of the annular groove.

[0017] As a preferred embodiment of this utility model, an output tube is rotatably inserted inside the fixed sleeve rod, one end of the output tube is rotatably inserted into the sealing plate, and a valve is provided on the output tube.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model, by setting a fixed sleeve rod, a rotating gear, a transmission gear, and a cleaning roller, when the transmission pulley rotates, the fixed sleeve rod will drive the rotating gear to rotate through the transmission gear. Due to the setting of the fixed internal gear ring, the rotating gear will revolve along the internal teeth of the fixed internal gear ring while rotating on its own axis, thereby driving the cleaning roller to revolve along the inner wall of the pyrolysis chamber while rotating on its own axis, thus achieving the effect of cleaning the inner wall of the pyrolysis chamber. At the same time, the cleaning roller will drive the exhaust pipe to rotate through the sealing plate, thereby allowing the hot air to be more evenly dispersed into the interior of the pyrolysis chamber.

[0020] 2. This utility model uses a drive motor to drive a transmission belt and a drive gear to drive the pyrolysis chamber to rotate along the arc-shaped groove of the support frame. When starting, the drive shaft drives the drive pulley, which in turn drives the transmission pulley and drive gear synchronously via the transmission belt. The gear meshes with the external gear ring to form a compound motion, causing the pyrolysis chamber to rotate continuously. This breaks the static sedimentation conditions of impurities and avoids the cleaning problems caused by their long-term accumulation and adhesion to the chamber wall. The equipment is made of high-grade materials. The heat exchange tubes of the hydrolyzer are made of 2205 alloy, the ammonia contact valve is made of 2507 alloy, and the dissolving tank, storage tank, and condensate tank are made of 316L stainless steel. The overall frame of the hydrolyzer is made of 304 stainless steel, which is more corrosion-resistant than the traditional carbon steel frame. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the exploded structure of the cleaning mechanism of this utility model;

[0025] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0026] Figure 6 For the present utility model Figure 3 Enlarged structural diagram at point B;

[0027] In the diagram: 1. Pyrolysis chamber; 2. Gas supply chamber; 3. Fixed internal gear ring; 4. Rotating gear; 5. Transmission gear; 6. Fixed sleeve rod; 7. Fixed plate; 8. Sealing plate; 9. Cleaning roller; 10. Exhaust pipe; 11. Drive motor; 12. Drive pulley; 13. Transmission toothed belt; 14. Transmission pulley; 15. Output pipe; 16. Support frame; 17. Drive shaft; 18. Drive gear; 19. Drive external gear ring; 20. Sealing cover; 21. Material supply pipe; 22. Gas supply pipe; 23. Slag discharge pipe; 24. Pressure gauge; 25. Fixed ring plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1 to 6 As shown, this utility model provides a urea-to-ammonia production device, comprising:

[0030] The pyrolysis chamber 1 has a gas delivery chamber 2 rotatably connected to one side of it. A fixed internal toothed ring 3 is fixedly connected to the inner wall of the gas delivery chamber 2. Two sets of support frames 16 are provided at the bottom of the pyrolysis chamber 1, and both sets of support frames 16 are rotatably connected to the pyrolysis chamber 1.

[0031] The cleaning mechanism is located inside the gas transmission chamber 2.

[0032] The cleaning mechanism includes a fixed sleeve rod 6, which is rotatably inserted through one side of the pyrolysis chamber 1. A transmission pulley 14 is fixedly connected to the fixed sleeve rod 6. A fixed plate 7 is rotatably sleeved on the fixed sleeve rod 6 and is rotatably connected to the inner wall of the pyrolysis chamber 1. A rotating shaft is rotatably connected to the fixed plate 7. A rotating gear 4 is fixedly connected to one end of the rotating shaft. The rotating gear 4 meshes with a fixed internal gear ring 3. A transmission gear 5 meshes with the rotating gear 4 and is fixedly connected to the fixed sleeve rod 6. A cleaning roller 9 is fixedly connected to the rotating gear 4 and contacts the inner wall of the pyrolysis chamber 1. A sealing plate 8 is rotatably inserted through the cleaning roller 9 and is rotatably connected to the inner wall of the gas delivery chamber 2. An exhaust pipe 10 is fixedly inserted through the sealing plate 8 and has several sets of exhaust holes.

[0033] When the transmission pulley 14 rotates, the fixed sleeve rod 6 will drive the transmission gear 5 to rotate, which in turn drives the rotating gear 4 to rotate. Due to the setting of the fixed internal gear ring 3, when the rotating gear 4 rotates, it will revolve along the internal teeth of the fixed internal gear ring 3, which will drive the cleaning roller 9 to rotate along the inner wall of the pyrolysis chamber 1, thereby cleaning the inner wall of the pyrolysis chamber 1. Due to the setting of the fixed plate 7, the rotating gear 4 will be supported. At the same time, the sealing plate 8 will drive the exhaust pipe 10 to rotate, so that the gas inside the gas delivery chamber 2 can be more evenly distributed when it enters the interior of the pyrolysis chamber 1 through the exhaust pipe 10.

[0034] Among them, the gas transmission chamber 2 is fixedly connected to the gas transmission pipe 22, and the gas transmission pipe 22 is equipped with a valve.

[0035] Due to the installation of the gas supply pipe 22, hot air can enter the interior of the gas supply chamber 2 and then be evenly distributed to the interior of the pyrolysis chamber 1 through the exhaust pipe 10.

[0036] Among them, a drive motor 11 is fixedly installed on a set of support frames 16, and the output end of the drive motor 11 is fixedly connected to a drive shaft 17. The drive shaft 17 is rotatably connected to the pyrolysis chamber 1. A drive pulley 12 is fixedly sleeved on the drive shaft 17, and a transmission toothed belt 13 is meshed between the drive pulley 12 and the transmission pulley 14.

[0037] When the drive motor 11 starts, the drive shaft 17 will drive the drive pulley 12 to rotate, and then drive the transmission pulley 14 to rotate through the transmission toothed belt 13.

[0038] One end of the drive shaft 17 is fixedly connected to a drive gear 18, and a drive external gear ring 19 is meshed on the drive gear 18. The drive external gear ring 19 is fixedly sleeved with the outer surface of the pyrolysis chamber 1.

[0039] When the drive shaft 17 rotates, it will drive the drive gear 18 to rotate, which in turn drives the pyrolysis chamber 1 to rotate through the drive external gear ring 19.

[0040] The pyrolysis chamber 1 is provided with a sealing cover 20 on one side. Several sets of bolts are threaded onto the sealing cover 20, and the sealing cover 20 is fixed to the pyrolysis chamber 1 by bolts.

[0041] The sealing cover 20 allows for easy opening of the pyrolysis chamber 1 for inspection.

[0042] Among them, a material conveying pipe 21 is rotatably inserted on the sealing cover 20, and several sets of nozzles are connected to the material conveying pipe 21.

[0043] The installation of the feed pipe 21 facilitates the more even spraying of urea solution into the interior of the pyrolysis chamber 1.

[0044] A pressure gauge 24 is fixedly installed on the sealing cover 20, with one end of the pressure gauge 24 passing through the sealing cover 20 and extending into the interior of the pyrolysis chamber 1.

[0045] The presence of pressure gauge 24 will facilitate the monitoring of the internal pressure of the pyrolysis chamber 1.

[0046] The pyrolysis chamber 1 is fixedly connected to a slag discharge pipe 23, and a valve is fixedly installed on the slag discharge pipe 23.

[0047] The upper setting of the slag discharge pipe 23 facilitates the discharge of impurities cleaned from inside the pyrolysis chamber 1.

[0048] The inner wall of the pyrolysis chamber 1 is fixedly connected to a fixed ring plate 25, and an annular groove is opened on the fixed ring plate 25. One end of the cleaning roller 9 and the exhaust pipe 10 are both in contact with the inner wall of the annular groove.

[0049] The fixed ring plate 25 makes the rotation of the cleaning roller 9 and the exhaust pipe 10 more stable.

[0050] The fixed sleeve rod 6 has an output pipe 15 that rotates through it. One end of the output pipe 15 rotates through the sealing plate 8, and a valve is installed on the output pipe 15.

[0051] Due to the setting of the output pipe 15, the gas generated after pyrolysis inside the pyrolysis chamber 1 can be discharged.

[0052] Working principle and usage process of this utility model:

[0053] When the urea solution is evenly sprayed into the interior of the pyrolysis chamber 1 through the feed pipe 21, hot air will enter the interior of the gas supply chamber 2 through the gas supply pipe 22 and enter the interior of the pyrolysis chamber 1 through the exhaust pipe 10. At the same time, the drive motor 11 is started. The drive shaft 17 will drive the drive external gear ring 19 to rotate through the drive gear 18, thereby driving the pyrolysis chamber 1 to rotate along the arc groove at the top of the support frame 16. This will reduce the situation where impurities accumulate a large amount of sediment during the pyrolysis process, causing them to adhere tightly to the inner wall of the pyrolysis chamber 1, making it difficult to clean the impurities.

[0054] At the same time, the drive shaft 17 will drive the drive pulley 12 to rotate, and then drive the transmission pulley 14 to rotate through the transmission toothed belt 13. At this time, the fixed sleeve rod 6 will drive the rotating gear 4 to rotate through the transmission gear 5. Due to the setting of the fixed internal toothed ring 3, when the rotating gear 4 rotates under the drive of the transmission gear 5, it will rotate along the internal teeth of the fixed internal toothed ring 3. At this time, the rotating gear 4 will revolve while rotating, and thus drive the cleaning roller 9 to revolve along the inner wall of the pyrolysis chamber 1 while rotating, thereby achieving the effect of cleaning the inner wall of the pyrolysis chamber 1. At the same time, the sealing plate 8 will rotate under the drive of the cleaning roller 9, and thus drive the exhaust pipe 10 to rotate, so that the hot air can be more evenly dispersed into the interior of the pyrolysis chamber 1.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A urea-to-ammonia plant characterized by, Including: Pyrolysis bin (1), one side of the pyrolysis bin (1) is rotatably connected with a gas conveying bin (2), a fixed inner gear ring (3) is fixedly connected to the inner wall of the gas conveying bin (2), and two groups of support frames (16) are arranged at the bottom of the pyrolysis bin (1), and the two groups of support frames (16) are rotatably connected with the pyrolysis bin (1); The cleaning mechanism is arranged in the interior of the gas conveying bin (2); Wherein, the cleaning mechanism includes a fixed sleeve rod (6), the fixed sleeve rod (6) is rotatably arranged on one side of the pyrolysis bin (1), a transmission belt pulley (14) is fixedly connected to the fixed sleeve rod (6), a fixed plate (7) is rotatably sleeved on the fixed sleeve rod (6), the fixed plate (7) is rotatably connected with the inner wall of the pyrolysis bin (1), a rotating shaft is rotatably connected to the fixed plate (7), one end of the rotating shaft is fixedly connected with a rotating gear (4), the rotating gear (4) is meshedly connected with the fixed inner gear ring (3), a transmission gear (5) is meshedly connected to the rotating gear (4), the transmission gear (5) is fixedly connected with the fixed sleeve rod (6), the rotating gear (4) is fixedly connected with a cleaning roller (9), the cleaning roller (9) is in contact with the inner wall of the pyrolysis bin (1), a sealing plate (8) is rotatably arranged on the cleaning roller (9), the sealing plate (8) is rotatably connected with the inner wall of the gas conveying bin (2), an exhaust pipe (10) is fixedly arranged on the sealing plate (8), and a plurality of exhaust holes are formed in the exhaust pipe (10).

2. A urea apparatus for producing ammonia according to claim 1, characterized in that: The gas conveying bin (2) is fixedly connected with a gas conveying pipe (22), and the gas conveying pipe (22) is provided with a valve.

3. A urea apparatus for producing ammonia according to claim 1, characterized in that: A driving motor (11) is fixedly installed on one group of support frames (16), an output shaft (17) of the driving motor (11) is fixedly connected with a driving motor (11), the output shaft (17) is rotatably arranged in the pyrolysis bin (1), a driving belt pulley (12) is fixedly sleeved on the output shaft (17), and a transmission gear belt (13) is meshedly connected between the driving belt pulley (12) and the transmission belt pulley (14).

4. A urea apparatus for producing ammonia according to claim 3, characterized in that: One end of the output shaft (17) is fixedly connected with a driving gear (18), the driving gear (18) is meshedly connected with a driving outer gear ring (19), and the driving outer gear ring (19) is fixedly sleeved on the outer surface of the pyrolysis bin (1).

5. A urea apparatus for producing ammonia according to claim 1, characterized in that: A sealing cover (20) is arranged on one side of the pyrolysis bin (1), a plurality of bolts are threadedly sleeved on the sealing cover (20), and the sealing cover (20) and the pyrolysis bin (1) are fixed by the bolts.

6. A urea apparatus for producing ammonia according to claim 5, characterized in that: A material conveying pipe (21) is rotatably arranged on the sealing cover (20), and a plurality of nozzles are connected to the material conveying pipe (21).

7. A urea apparatus for producing ammonia according to claim 5, characterized in that: A gas pressure gauge (24) is fixedly installed on the sealing cover (20), one end of the gas pressure gauge (24) is rotatably arranged on the sealing cover (20) and extends into the interior of the pyrolysis bin (1).

8. A urea apparatus for producing ammonia according to claim 1, characterized in that: An ash discharging pipe (23) is fixedly connected to the pyrolysis bin (1), and a valve is fixedly arranged on the ash discharging pipe (23).

9. A urea apparatus for producing ammonia according to claim 1, characterized in that: The inner wall of the pyrolysis bin (1) is fixedly connected with a fixed ring plate (25), an annular groove is formed in the fixed ring plate (25), and the cleaning roller (9) and one end of the exhaust pipe (10) are in abutment with the inner wall of the annular groove.

10. A urea apparatus for producing ammonia according to claim 1, characterized in that: The inside of the fixed sleeve rod (6) is rotatably provided with an output pipe (15), one end of the output pipe (15) is rotatably provided with the sealing plate (8), and the output pipe (15) is provided with a valve.

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