A urea dissolution circulation system having a urea hydrolyzer outlet valve structure

Abstract

The application discloses a urea solution circulating system with a urea hydrolyzer outlet valve structure, and belongs to the technical field of urea hydrolysis. Mainly comprising: a urea solution storage tank and a delivery pump arranged on the lower end of the outer wall of the urea solution storage tank through a pipeline. When a certain hydrolyzer needs to be overhauled and needs to be emptied, in addition to being able to return to the urea solution storage tank through a hydrolyzer A liquid phase return valve, a hydrolyzer B liquid phase return valve and a hydrolyzer C liquid phase return valve, the urea solution in the hydrolyzer can also be delivered to a hydrolyzer in a running state through a hydrolyzer A urea solution delivery pump, a hydrolyzer A urea solution outlet valve, a hydrolyzer B urea solution delivery pump, a hydrolyzer B urea solution outlet valve, a hydrolyzer C urea solution delivery pump or a hydrolyzer C urea solution outlet valve. The urea solution in the hydrolyzer heated to the reaction temperature is delivered to the hydrolyzer in the running state to directly participate in the hydrolysis reaction, thereby saving heat sources.

Description

Technical Field

[0001] This utility model relates to the field of urea hydrolysis technology, specifically to a urea dissolution and circulation system with an outlet valve structure for a urea hydrolyzer. Background Technology

[0002] Urea hydrolysis refers to the process by which urea decomposes into ammonia and carbon dioxide in the presence of water. During the urea synthesis process, the waste liquid discharged from the desorber still contains urea. To protect the environment, this waste liquid is hydrolyzed in a hydrolysis tower under high temperature and high pressure conditions, causing the urea in the waste liquid to be hydrolyzed into ammonia and carbon dioxide by steam.

[0003] Currently, when a hydrolyzer needs maintenance and evacuation, the urea solution inside the hydrolyzer is usually discharged to the waste liquid pool through an emergency discharge valve. This method results in a significant waste of urea solution. Another common operation is to recover the urea solution to the urea solution storage tank through a liquid phase reflux pipe. However, due to the large temperature difference between the solution inside the hydrolyzer and the storage tank, this leads to a significant loss of heat energy.

[0004] Therefore, we propose a urea dissolution and circulation system with a urea hydrolyzer outlet valve structure to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a urea dissolution and circulation system with an outlet valve structure for a urea hydrolyzer, in order to solve the problem mentioned in the background art where, when a hydrolyzer needs maintenance and venting, the urea solution in the hydrolyzer is usually discharged to the waste liquid pool through an emergency discharge valve, which results in a large waste of urea solution. Another conventional operation is to recover the urea solution to the urea solution storage tank through a liquid phase reflux pipe, but due to the large temperature difference between the solution in the hydrolyzer and the storage tank, a large amount of heat energy is lost.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a urea dissolution and circulation system with a urea hydrolyzer outlet valve structure, comprising a urea solution storage tank and a delivery pump installed at the lower end of one side of the outer wall of the urea solution storage tank via a pipeline. One end of the delivery pump is fixedly equipped with an outlet valve, and the other end of the outlet valve is fixedly equipped with a urea solution inlet pipe. A hydrolyzer C urea solution outlet valve is fixedly installed on one side of the upper end of the urea solution inlet pipe. One end of the hydrolyzer C urea solution outlet valve is connected to a hydrolyzer C urea solution delivery pump, and one end of the hydrolyzer C urea solution delivery pump is connected to a hydrolyzer C liquid phase reflux valve. A hydrolyzer C urea solution inlet valve is fixedly installed on the other side of the upper end of the urea solution inlet pipe. A hydrolyzer C urea solution inlet regulating valve is installed at the upper end of the hydrolyzer C urea solution inlet valve. The hydrolyzer C urea solution inlet regulating valve and one end of the hydrolyzer C urea solution delivery pump are connected to the hydrolyzer C via a pipeline.

[0007] Furthermore, a hydrolyzer liquid phase reflux pipe is fixedly installed at one end of the liquid phase reflux valve of the hydrolyzer C, a hydrolyzer B is connected to the middle of one end of the urea solution inlet pipe, and a hydrolyzer A is connected to the other end of the urea solution inlet pipe.

[0008] Furthermore, a urea solution inlet regulating valve for hydrolyzer B is installed on one side of the lower end of hydrolyzer B, and a urea solution inlet valve for hydrolyzer B is installed at the lower end of the urea solution inlet regulating valve for hydrolyzer B. A urea solution delivery pump for hydrolyzer B is installed on the other side of the lower end of hydrolyzer B, and a liquid phase reflux valve for hydrolyzer B is connected to one side of the upper end of the urea solution delivery pump for hydrolyzer B.

[0009] Furthermore, a urea solution inlet regulating valve for hydrolyzer A is installed on one side of the lower end of hydrolyzer A, and a urea solution inlet valve for hydrolyzer A is installed at the lower end of the urea solution inlet regulating valve for hydrolyzer A. A urea solution delivery pump for hydrolyzer A is installed on the other side of the lower end of hydrolyzer A. A liquid phase reflux valve for hydrolyzer A is installed on one side of the upper end of the urea solution delivery pump for hydrolyzer A, and an outlet valve for urea solution for hydrolyzer A is installed at the lower end of the urea solution delivery pump for hydrolyzer A.

[0010] Furthermore, a shut-off valve from the dissolving tank to the storage tank is installed on the upper side of the urea solution storage tank, and a steam inlet regulating valve is installed on the lower side of the urea solution storage tank.

[0011] Furthermore, the outlet valve includes a valve body and connecting pipes fixedly installed at both ends of the valve body. One end of the connecting pipe is fixedly installed with a connecting pipe by screws. An upper protection mechanism is provided at the upper end of the connection between the connecting pipe and the connecting pipe, and a lower protection mechanism is magnetically connected to the lower end of the upper protection mechanism.

[0012] Furthermore, the upper protection mechanism includes a first hollow semicircular block and insertion magnetic blocks respectively fixedly installed on both sides of the lower end of the first hollow semicircular block.

[0013] Furthermore, the lower protection mechanism includes a second hollow semicircular block and magnetic slots respectively opened on both sides of the upper end of the second hollow semicircular block. Multiple elastic elements are fixed at equal intervals on both sides of the inner wall of the second hollow semicircular block, and a clamp is fixedly installed on one end of each elastic element.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This application provides a urea dissolution and circulation system with a urea hydrolyzer outlet valve structure. Through the coordinated use of a urea solution reflux valve for hydrolyzer A, a urea solution reflux valve for hydrolyzer B, a urea solution reflux valve for hydrolyzer C, an external urea solution storage tank, a urea solution transfer pump for hydrolyzer A, and a urea solution outlet valve for hydrolyzer A, or a urea solution transfer pump for hydrolyzer B, and a urea solution outlet valve for hydrolyzer B, or a urea solution transfer pump for hydrolyzer C, and a urea solution outlet valve for hydrolyzer C, the urea solution heated to the reaction temperature in the hydrolyzer is transported to the operating hydrolyzer to directly participate in the hydrolysis reaction by installing a urea solution transfer pump and an outlet valve on the reflux pipeline of the hydrolyzer, thereby saving heat source.

[0015] 2. The urea dissolution and circulation system provided in this application, which has an outlet valve structure for a urea hydrolyzer, protects the connection position of the connecting pipe and the connecting tube by using the outlet valve, connecting pipe, first hollow semicircular block, second hollow semicircular block, insertion magnetic block, magnetic slot, elastic element and clamping plate in combination, thereby improving the stability of the connection between the connecting pipe and the connecting tube. Attached Figure Description

[0016] Figure 1 This is a diagram of the urea dissolution and circulation system of this utility model; Figure 2 This is a three-dimensional structural diagram of the outlet valve of this utility model; Figure 3 This is a three-dimensional structural diagram of the upper and lower protective mechanisms of this utility model; Figure 4 For the present utility model Figure 3 Enlarged view of point A.

[0017] In the diagram: 1. Urea solution storage tank; 2. Transfer pump; 3. Outlet valve; 31. Valve body; 32. Connecting pipe; 33. Connecting pipe; 34. Upper protection mechanism; 341. First hollow semicircular block; 342. Insertion magnetic block; 35. Lower protection mechanism; 351. Second hollow semicircular block; 352. Magnetic slot; 353. Elastic element; 354. Clamping plate; 4. Urea solution inlet pipe; 5. Urea solution outlet valve of hydrolyzer C; 6. Urea solution transfer pump of hydrolyzer C; 7. Liquid phase reflux valve of hydrolyzer C; 8. Urea solution inlet valve of hydrolyzer C; 9. Urea solution inlet regulating valve of hydrolyzer C; 10. Water 20. Hydrolyzer C; 21. Hydrolyzer B; 22. Urea solution inlet regulating valve of hydrolyzer B; 23. Urea solution inlet valve of hydrolyzer B; 24. Urea solution transfer pump of hydrolyzer B; 25. Liquid phase reflux valve of hydrolyzer B; 30. Liquid phase reflux pipe of hydrolyzer; 40. Hydrolyzer A; 41. Urea solution inlet regulating valve of hydrolyzer A; 42. Urea solution inlet valve of hydrolyzer A; 43. Urea solution transfer pump of hydrolyzer A; 44. Liquid phase reflux valve of hydrolyzer A; 45. Urea solution outlet valve of hydrolyzer A; 50. Shut-off valve from dissolving tank to storage tank; 60. Steam inlet regulating valve. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] like Figure 1As shown, a urea dissolution and circulation system with a urea hydrolyzer outlet valve structure includes a urea solution storage tank 1 and a transfer pump 2 installed at the lower end of one side of the outer wall of the urea solution storage tank 1 via a pipeline. An outlet valve 3 is fixedly installed at one end of the transfer pump 2, and a urea solution inlet pipe 4 is fixedly installed at the other end of the outlet valve 3. A hydrolyzer C urea solution outlet valve 5 is fixedly installed on one side of the upper end of the urea solution inlet pipe 4. A hydrolyzer C urea solution transfer pump 6 is connected to one end of the hydrolyzer C urea solution outlet valve 5. A hydrolyzer C urea solution reflux valve 7 is connected to one end of the hydrolyzer C urea solution transfer pump 6. A hydrolyzer C urea solution inlet valve 8 is fixedly installed on the other side of the upper end of the urea solution inlet pipe 4. A hydrolyzer C urea solution inlet regulating valve 9 is installed at the upper end of the hydrolyzer C urea solution inlet valve 8. The hydrolyzer C urea solution inlet regulating valve 9 and one end of the hydrolyzer C urea solution transfer pump 6 are connected to a hydrolyzer C10 via a pipeline.

[0021] One end of the liquid phase reflux valve 7 of hydrolyzer C is fixedly installed with the liquid phase reflux pipe 30 of hydrolyzer, one end of the urea solution inlet pipe 4 is connected to the middle of the hydrolyzer B20, and the other end of the urea solution inlet pipe 4 is connected to the hydrolyzer A40.

[0022] A urea solution inlet regulating valve 21 for hydrolyzer B is installed on one side of the lower end of hydrolyzer B20. A urea solution inlet valve 22 for hydrolyzer B is installed at the lower end of the urea solution inlet regulating valve 21 for hydrolyzer B. A urea solution delivery pump 23 for hydrolyzer B is installed on the other side of the lower end of hydrolyzer B20. A liquid phase reflux valve 24 for hydrolyzer B is connected to one side of the upper end of the urea solution delivery pump 23 for hydrolyzer B. The upper end of the liquid phase reflux valve 24 for hydrolyzer B is connected to the liquid phase reflux pipe 30 of the hydrolyzer.

[0023] A urea solution inlet regulating valve 41 for hydrolyzer A is installed on one side of the lower end of hydrolyzer A40. A urea solution inlet valve 42 for hydrolyzer A is installed at the lower end of the urea solution inlet regulating valve 41 for hydrolyzer A40. A urea solution delivery pump 43 for hydrolyzer A40 is installed on the other side of the lower end of hydrolyzer A40. A liquid phase reflux valve 44 for hydrolyzer A is installed on one side of the upper end of the urea solution delivery pump 43 for hydrolyzer A40. A urea solution outlet valve 45 for hydrolyzer A40 is installed at the lower end of the urea solution delivery pump 43 for hydrolyzer A40. The upper end of the liquid phase reflux valve 44 for hydrolyzer A40 is connected to the liquid phase reflux pipe 30 of the hydrolyzer.

[0024] A shut-off valve 50 from the dissolving tank to the storage tank is installed on one side of the upper end of the urea solution storage tank 1. The urea solution at the upper end of the urea solution storage tank 1 comes from the dissolving tank. A steam inlet regulating valve 60 is installed on one side of the lower end of the urea solution storage tank 1.

[0025] The urea solution in urea solution storage tank 1 flows through transfer pump 2 and transfer pump outlet valve 3, then through urea solution inlet pipe 4, and through urea solution inlet valve 42 of hydrolyzer A, urea solution inlet regulating valve 41 of hydrolyzer A, urea solution inlet valve 22 and urea solution inlet regulating valve 21 of hydrolyzer B, urea solution inlet valve 8 and urea solution inlet regulating valve 9 of hydrolyzer C, respectively, into hydrolyzers A40, B20, and C10 to produce NH3, CO2, and H2O through hydrolysis. This is then transported to the unit via ammonia supply pipeline to complete the denitrification reaction. To maintain the liquid level in the hydrolyzers... Under stable and normal conditions, excess urea solution will flow back to urea solution storage tank 1 through the liquid phase reflux valve 44 of hydrolyzer A, the liquid phase reflux valve 24 of hydrolyzer B, and the liquid phase reflux valve 7 of hydrolyzer C. When the urea solution supply system needs to be isolated for maintenance, urea solution will be supplied to the hydrolyzers in operation by opening the urea solution transfer pump 43 of hydrolyzer A (which is in standby mode), the urea solution outlet valve 45 of hydrolyzer A, or the urea solution transfer pump 23 of hydrolyzer B and the urea solution outlet valve 25 of hydrolyzer B, or the urea solution transfer pump 6 of hydrolyzer C and the urea solution outlet valve 5 of hydrolyzer C.

[0026] In this application, when a hydrolyzer needs maintenance and requires evacuation, in addition to returning the urea solution to the urea solution storage tank via the urea solution reflux valve 44 of hydrolyzer A, the urea solution reflux valve 24 of hydrolyzer B, and the urea solution reflux valve 7 of hydrolyzer C, the urea solution in the hydrolyzer can also be transported to the operating hydrolyzer via the urea solution transfer pump 43 of hydrolyzer A, the urea solution outlet valve 45 of hydrolyzer A, the urea solution transfer pump 23 of hydrolyzer B, the urea solution outlet valve 25 of hydrolyzer B, or the urea solution transfer pump 6 of hydrolyzer C, and the urea solution outlet valve 5 of hydrolyzer C. This system, by installing the urea solution transfer pump 2 and the outlet valve 3 on the hydrolyzer reflux pipeline, transports the urea solution heated to the reaction temperature in the hydrolyzer to the operating hydrolyzer to directly participate in the hydrolysis reaction. This not only saves heat but also plays an important role when the urea solution cannot be supplied normally.

[0027] It should be noted that the urea solution delivery pump 2 and the outlet valve 3 can be installed on the return pipe, or a separate pipe can be added from the bottom of the hydrolyzer, as long as the system needs are met; under normal operating conditions, the urea solution delivery pump 2 and the outlet valve 3 of the hydrolyzer can also be opened to supply urea solution, again as long as the system needs are met.

[0028] like Figure 2 As shown, the outlet valve 3 includes a valve body 31 and connecting pipes 32 fixedly installed at both ends of the valve body 31. One end of the connecting pipe 32 is fixedly installed with a connecting pipe 33 by screws. An upper protection mechanism 34 is provided at the upper end of the connection between the connecting pipe 32 and the connecting pipe 33. A lower protection mechanism 35 is magnetically connected to the lower end of the upper protection mechanism 34.

[0029] like Figures 3-4 As shown, the upper protection mechanism 34 includes a first hollow semicircular block 341 and insertion magnetic blocks 342 respectively fixedly installed on both sides of the lower end of the first hollow semicircular block 341.

[0030] The lower protection mechanism 35 includes a second hollow semicircular block 351 and magnetic slots 352 respectively opened on both sides of the upper end of the second hollow semicircular block 351. Multiple elastic elements 353 are fixed at equal intervals on both sides of the inner wall of the second hollow semicircular block 351. A clamping plate 354 is fixedly installed on one end of the elastic element 353.

[0031] The structure of the first hollow semicircular block 341 is the same as that of the second hollow semicircular block 351, the elastic element 353, and the clamping plate 354.

[0032] The inserted magnetic block 342 is magnetically attracted to the inner cavity of the magnetic slot 352 to complete the magnetic connection and fixation of the second hollow semicircular block 351 and the first hollow semicircular block 341.

[0033] In this application, both ends of the outlet valve 3 are fixedly installed to the connecting pipe 33 via flanges connected by screws. A first hollow semicircular block 341 is fitted onto the upper end of the connection between the connecting pipe 33 and the connecting pipe 32, and a second hollow semicircular block 351 is inserted from the lower end of the connection between the connecting pipe 33 and the connecting pipe 32. This causes the insertion magnetic block 342 to be magnetically attracted into the inner cavity of the magnetic slot 352, thus completing the fixed connection between the first hollow semicircular block 341 and the second hollow semicircular block 351. Simultaneously, elastic elements 353 are used to fix the connection. The clamping plates 354 installed on both sides of the inner walls of the first hollow semicircular block 341 and the second hollow semicircular block 351 will automatically clamp the two sides of the connection between the connecting pipe 33 and the connecting pipe 32 under the elastic force of the elastic element 353, thereby improving the stability of the connection between the first hollow semicircular block 341 and the second hollow semicircular block 351. The first hollow semicircular block 341 and the second hollow semicircular block 351 are set to protect the connection position of the connecting pipe 33 and the connecting pipe 32, thereby improving the stability of the connection between the connecting pipe 33 and the connecting pipe 32.

[0034] The outlet valve 3 is a current technology and is not limited here. It can be installed by purchasing finished products from the market, such as the PZ41TC-16C series outlet valve.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure, comprising a urea solution storage tank (1) and a transfer pump (2) disposed at the lower end of one side of the outer wall of the urea solution storage tank (1) via a pipeline, characterized in that: One end of the delivery pump (2) is fixedly equipped with an outlet valve (3), and the other end of the outlet valve (3) is fixedly equipped with a urea solution inlet pipe (4). The upper end of the urea solution inlet pipe (4) is fixedly equipped with a hydrolyzer C urea solution outlet valve (5). One end of the hydrolyzer C urea solution outlet valve (5) is connected to a hydrolyzer C urea solution delivery pump (6). One end of the hydrolyzer C urea solution delivery pump (6) is connected to a hydrolyzer C liquid phase reflux valve (7). The other end of the upper end of the urea solution inlet pipe (4) is fixedly equipped with a hydrolyzer C urea solution inlet valve (8). The upper end of the hydrolyzer C urea solution inlet valve (8) is equipped with a hydrolyzer C urea solution inlet regulating valve (9). The hydrolyzer C urea solution inlet regulating valve (9) and one end of the hydrolyzer C urea solution delivery pump (6) are connected to the hydrolyzer C (10) through a pipe.

2. The urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 1, characterized in that: One end of the liquid phase reflux valve (7) of the hydrolyzer C is fixedly installed with the liquid phase reflux pipe (30) of the hydrolyzer, the middle of one end of the urea solution inlet pipe (4) is connected to the hydrolyzer B (20), and the other end of the urea solution inlet pipe (4) is connected to the hydrolyzer A (40).

3. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 2, characterized in that: A urea solution inlet regulating valve (21) is installed on one side of the lower end of the hydrolyzer B (20). A urea solution inlet valve (22) is installed at the lower end of the urea solution inlet regulating valve (21). A urea solution delivery pump (23) is installed on the other side of the lower end of the hydrolyzer B (20). A liquid phase reflux valve (24) is connected to one side of the upper end of the urea solution delivery pump (23).

4. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 2, characterized in that: A urea solution inlet regulating valve (41) is installed on one side of the lower end of the hydrolyzer A (40). A urea solution inlet valve (42) is installed at the lower end of the urea solution inlet regulating valve (41). A urea solution delivery pump (43) is installed on the other side of the lower end of the hydrolyzer A (40). A liquid phase reflux valve (44) is installed on one side of the upper end of the urea solution delivery pump (43). A urea solution outlet valve (45) is installed at the lower end of the urea solution delivery pump (43).

5. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 1, characterized in that: A dissolving tank to storage tank shut-off valve (50) is installed on the upper side of the urea solution storage tank (1), and a steam inlet regulating valve (60) is installed on the lower side of the urea solution storage tank (1).

6. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 1, characterized in that: The outlet valve (3) includes a valve body (31) and connecting pipes (32) fixedly installed at both ends of the valve body (31). One end of the connecting pipe (32) is fixedly installed with a connecting pipe (33) by screws. An upper protection mechanism (34) is provided at the upper end of the connection between the connecting pipe (32) and the connecting pipe (33). A lower protection mechanism (35) is magnetically connected to the lower end of the upper protection mechanism (34).

7. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 6, characterized in that: The upper protection mechanism (34) includes a first hollow semicircular block (341) and insertion magnetic blocks (342) respectively fixedly installed on both sides of the lower end of the first hollow semicircular block (341).

8. A urea dissolution and circulation system with a urea hydrolyzer outlet valve structure according to claim 7, characterized in that: The lower protection mechanism (35) includes a second hollow semicircular block (351) and magnetic slots (352) respectively opened on both sides of the upper end of the second hollow semicircular block (351). Multiple elastic elements (353) are fixed on both sides of the inner wall of the second hollow semicircular block (351) at equal intervals. A clamp (354) is fixedly installed on one end of the elastic element (353).

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