On-line monitoring and alarming device for corrosion leakage of urea hydrolyzer

Abstract

The utility model discloses an on-line monitoring and alarming device for corrosion leakage of a urea hydrolyzer. The on-line monitoring and alarming device comprises the urea hydrolyzer and a heating coil, a steam inlet is formed in the upper part of the urea hydrolyzer, and a drain outlet, a urea solution inlet and a hydrolysate outlet are formed in the lower part of the urea hydrolyzer; the drain outlet is connected with a first main pipe of which the other end is connected with a drain tank; a first cooling pipe and a first monitoring mechanism are sequentially arranged on the first main pipe from top to bottom; the hydrolysate outlet is connected with a second main pipe which is connected with a waste liquid pool; a second cooling pipe and a second monitoring mechanism are sequentially arranged on the second main pipe; the second monitoring mechanism is connected with a urea solution storage tank; the first monitoring mechanism and the second monitoring mechanism are both connected with a controller, and an alarm device is arranged in the controller. The system provided by the utility model has the advantages of simple structure, convenient use, timely monitoring, timely response and high automation degree.

Description

Technical Field

[0001] The utility model relates to the technical field of urea hydrolysis to produce ammonia, and more specifically to an online monitoring and alarm device for corrosion and leakage of a urea hydrolyzer. Background Art

[0002] At present, the use of urea hydrolysis to produce ammonia technology to prepare denitrification reducing agents for power plants has become the mainstream technical route. Urea solution with a concentration of about 50% is transported to the urea hydrolysis reactor, but in actual use, due to the strong corrosiveness of the urea solution environment, the urea hydrolyzer has leakage of heating coils and corrosion of the cylinder, affecting the safe and stable operation of the denitrification system.

[0003] Therefore, there is an urgent need for an online monitoring and alarm device for corrosion and leakage of a urea hydrolyzer. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an online monitoring and alarm device for corrosion and leakage of a urea hydrolyzer, so as to solve the problems in the background technology.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0006] A urea hydrolyzer corrosion leakage online monitoring and alarm device comprises a urea hydrolyzer and a heating coil arranged in the urea hydrolyzer; the urea hydrolyzer is provided with a steam inlet connected to the heating coil at the upper part, and a drain outlet, a urea inlet and a hydrolyzed liquid outlet at the lower part; the drain outlet is connected to a first main pipe, and the other end of the first main pipe is connected to a drain tank; the first main pipe is provided with a first cooling pipe and a first monitoring mechanism located between the first cooling pipe and the drain tank in sequence from top to bottom; the hydrolyzed liquid outlet is connected to a second main pipe, and the other end of the second main pipe is connected to a waste liquid tank; the second main pipe is provided with a second cooling pipe and a second monitoring mechanism located between the second cooling pipe and the waste liquid tank in sequence from top to bottom; the second monitoring mechanism is connected to a urea solution storage tank; the first monitoring mechanism and the second monitoring mechanism are both connected to a controller, and an alarm device is arranged in the controller.

[0007] To further optimize the technical solution, a first water outlet is arranged at the upper portion of the first cooling pipe, and the first water outlet is connected to the first water outlet pipe; a first water inlet is arranged at the lower portion of the first cooling pipe, and the first water inlet is connected to the first water inlet pipe.

[0008] To further optimize the technical solution, the first monitoring mechanism includes a first online thermometer, a first main pipe valve, an online pH meter, and an online conductivity meter which are sequentially arranged on the first main pipe; a first branch pipe connected to the drain tank is connected below the first online thermometer, and a first branch pipe valve which is arranged in parallel and used in conjunction with the first main pipe valve is arranged on the first branch pipe.

[0009] To further optimize the technical solution, a second water outlet is arranged at the upper portion of the second cooling pipe, and the second water outlet is connected to the second water outlet pipe; a second water inlet is arranged at the lower portion of the second cooling pipe, and the second water inlet is connected to the second water inlet pipe.

[0010] To further optimize the technical solution, the second monitoring mechanism includes a second online thermometer, a second main pipe valve, an online chlorine meter, and a third main pipe valve which are sequentially arranged on the second main pipe; a second branch pipe is connected below the second online thermometer, the other end of the second branch pipe is connected to the waste liquid tank, and a second branch pipe valve is arranged on the second branch pipe; a third branch pipe is connected below the online chlorine meter, the other end of the third branch pipe is connected to the urea solution storage tank, and a third branch pipe valve is arranged on the third branch pipe.

[0011] To further optimize the technical solution, the output ends of the first online thermometer, online pH meter, online conductivity meter, second online thermometer, and online chlorine meter are all connected to the controller; the controlled ends of the first main valve, first branch valve, second main valve, third main valve, second branch valve, and third branch valve are all connected to the controller.

[0012] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0013] The utility model provides an online monitoring and alarm device for corrosion and leakage of a urea hydrolyzer. The online chlorine meter monitors the chloride ions in the hydrolyzate in real time, and triggers an alarm when the value exceeds a certain value, thereby reducing the possibility of corrosion of the heating coil by high concentration chloride ions in the hydrolyzate. When the heating coil of the urea hydrolyzer leaks, the online pH meter and the online conductivity meter trigger an alarm, thereby monitoring the leakage of the urea hydrolyzer in real time and handling it in time. The utility model has the advantages of simple structure, easy use, timely monitoring, timely response, and high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Wherein: 1. urea hydrolyzer, 2. heating coil, 3. steam inlet, 4. drain outlet, 5. urea solution inlet, 6. hydrolyzate outlet, 7. first main pipe, 8. first cooling pipe, 9. first water inlet, 10. first water inlet pipe, 11. first water outlet, 12. first water outlet pipe, 13. first online thermometer, a, first main pipe valve, 14. online pH meter, 15. online conductivity meter, 16. drain tank, 17. first branch pipe , b, first branch valve, 18, second main pipe, 19, second cooling pipe, 20, second water inlet, 21, second water inlet pipe, 22, second water outlet, 23, second water outlet pipe, 24, second online thermometer, c, second main pipe valve, 25, online chlorine meter, e, third main pipe valve, 26, waste liquid tank, 27, second branch pipe, d, second branch valve, 28, third branch pipe, f, third branch valve, 29, urea solution storage tank, 30, controller. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] An online monitoring and alarm device for corrosion and leakage of urea hydrolyzer, combined with Figure 1 As shown, it includes a urea hydrolyzer 1, a heating coil 2, a steam inlet 3, a drain outlet 4, a urea solution inlet 5, a hydrolyzate outlet 6, a first main pipe 7, a first cooling pipe 8, a first monitoring mechanism, a drain tank 16, a first branch pipe 17, a first branch pipe valve b, a second main pipe 18, a second cooling pipe 19, a second monitoring mechanism, a waste liquid tank 26, a second branch pipe 27, a second branch pipe valve d, a third branch pipe 28, a urea solution storage tank 29, a third branch pipe valve f, and a controller 30.

[0018] The first cooling pipe 8 includes a first water inlet 9, a first water inlet pipe 10, a first water outlet 11, and a first water outlet pipe 12; the first monitoring mechanism includes a first online thermometer 13, a first main pipe valve a, an online pH meter 14, and an online conductivity meter 15; the second cooling pipe 19 includes a second water inlet 20, a second water inlet pipe 21, a second water outlet 22, and a second water outlet pipe 23; the second monitoring mechanism includes a second online thermometer 24, a second main pipe valve c, an online chlorine meter 25, and a third main pipe valve e.

[0019] A heating coil 2 is arranged in the urea hydrolyzer 1, a steam inlet 3 connected to the heating coil 2 is arranged at the upper part of the urea hydrolyzer 1, a drain outlet 4 is arranged at the lower part, and a urea solution inlet 5 and a hydrolyzed liquid outlet 6 are arranged at the lower part of the urea hydrolyzer 1.

[0020] The drain outlet 4 is connected to the first main pipe 7, and the other end of the first main pipe 7 is connected to the drain tank 16. The first main pipe 7 is provided with a first cooling pipe 8 for cooling and a first monitoring mechanism, and the first monitoring mechanism is located between the first cooling pipe 8 and the drain tank 16.

[0021] The solution outlet 6 is connected to the second main pipe 18, and the other end of the second main pipe 18 is connected to the waste liquid pool 26. The second main pipe 18 is provided with a second cooling pipe 19 for cooling and a second monitoring mechanism, and the second monitoring mechanism is located between the second cooling pipe 19 and the waste liquid pool 26.

[0022] The first monitoring mechanism and the second monitoring mechanism are both connected to the controller 30 , and an alarm device is arranged in the controller 30 .

[0023] A first water outlet 11 is disposed at the upper portion of the first cooling pipe 8 , and the first water outlet 11 is connected to a first water outlet pipe 12 . A first water inlet is disposed at the lower portion of the first cooling pipe 8 , and the first water inlet is connected to a first water inlet pipe 10 .

[0024] The first monitoring mechanism includes a first online thermometer 13, a first main pipe valve a, an online pH meter 14, and an online conductivity meter 15, which are sequentially arranged on the first main pipe 7. A first branch pipe 17 connected to the drain tank 16 is connected below the first online thermometer 13, and a first branch pipe valve b is arranged on the first branch pipe 17, which is arranged in parallel with the first main pipe valve a and used in conjunction with each other.

[0025] A second water outlet 22 is disposed at the upper portion of the second cooling pipe 19 , and the second water outlet 22 is connected to a second water outlet pipe 23 ; a second water inlet 20 is disposed at the lower portion of the second cooling pipe 19 , and the second water inlet 20 is connected to a second water inlet pipe 21 .

[0026] The second monitoring mechanism includes a second online thermometer 24, a second main pipe valve c, an online chlorine meter 25, and a third main pipe valve e, which are sequentially arranged on the second main pipe 18. A second branch pipe 27 is connected below the second online thermometer 24, the other end of which is connected to a waste liquid tank 26 connected to the end of the second main pipe 18, and a second branch pipe valve d is arranged on the second branch pipe 27. A third branch pipe 28 is connected below the online chlorine meter 25, the other end of which is connected to a urea solution storage tank 29, and a third branch pipe valve f is arranged on the third branch pipe 28.

[0027] The hydrolyzed liquid passing through the second monitoring mechanism enters the urea solution storage tank 29 through the third branch pipe 28 , and can re-enter the hydrolyzer 1 together with the urea solution through the urea solution inlet 5 .

[0028] The output ends of the first online thermometer 13, the online pH meter 14, the online conductivity meter 15, the second online thermometer 24, and the online chlorine meter 25 are all connected to the controller 30; the controlled ends of the first main pipe valve a, the first branch pipe valve b, the second main pipe valve c, the third main pipe valve e, the second branch pipe valve d, and the third branch pipe valve f are all connected to the controller 30.

[0029] When the utility model is actually used, the high-temperature saturated steam in the heating coil 2 in the urea hydrolyzer 1 is cooled to hydrophobicity after surface heat exchange with the urea solution through the heating coil 2, and is discharged from the urea hydrolyzer 1 from the steam hydrophobicity outlet 4. In this process, the hydrophobicity is not mixed with the urea solution.

[0030] The water flow in the first cooling pipe 8 adopts a countercurrent from bottom to top, so as to cool the steam drain with maximum efficiency, and at the same time, the drain water temperature after cooling is monitored in real time by the first-line thermometer 13; when the water temperature is normal, the controller controls valves a and b to allow the drain to pass through the online pH meter 14 and the online conductivity meter 15 for monitoring; when the water temperature is high, the controller controls valves a and b to allow the drain to not pass through the online pH meter 14 and the online conductivity meter 15, but to be discharged directly to the drain tank 16 through the first branch pipe 17; the accuracy of online instrument measurement is ensured, and high temperature damage to the instrument is prevented.

[0031] When the heating coil 2 of the urea hydrolyzer leaks, the urea hydrolyzate mixes with the hydrophobic liquid in the heating coil 2 through the leak point, resulting in significant changes in the hydrophobic pH value and conductivity. The values ​​of the online pH meter 14 and the online conductivity meter 15 exceed certain values, triggering the alarm device in the controller 30, thereby monitoring the leakage of the urea hydrolyzer in real time and taking timely measures.

[0032] The water flow in the second cooling pipe 19 adopts a countercurrent from bottom to top, so as to cool the hydrolyzed liquid with maximum efficiency, and the water temperature of the cooled hydrolyzed liquid is monitored in real time by the second online thermometer 24. When the water temperature is normal, the controller controls valves c and d to allow the hydrolyzed liquid to pass through the online chlorine meter 25 for monitoring; when the water temperature is high, the controller controls valves c and d to allow the hydrolyzed liquid to not pass through the online chlorine meter 25, and to be directly discharged to the waste liquid pool 26 through the second branch pipe 27.

[0033] After the online chlorine meter 25 monitors the chloride ions in the hydrolyzate, if the chloride ion concentration does not exceed the alarm value range, the controller controls valves e and f to allow the hydrolyzate to enter the urea solution storage tank 29 through the third branch pipe 28, and the hydrolyzate and the urea solution in the urea solution storage tank 29 re-enter the hydrolyzer 1 through the urea solution inlet 5; if the chloride ions in the hydrolyzate exceed the alarm value range, an alarm is triggered, and the controller controls valves e and f to discharge the hydrolyzate to the waste liquid tank 26.

Claims

1. An online monitoring and alarm device for corrosion and leakage of a urea hydrolyzer, characterized in that: The invention comprises a urea hydrolyzer (1) and a heating coil (2) arranged in the urea hydrolyzer (1); the upper part of the urea hydrolyzer (1) is provided with a steam inlet (3) connected to the heating coil (2), and the lower part is provided with a drain outlet (4), a urea solution inlet (5), and a hydrolyzed liquid outlet (6); the drain outlet (4) is connected to a first main pipe (7), and the other end of the first main pipe (7) is connected to a drain tank (16); the first main pipe (7) is provided with a first cooling pipe (8), a first cooling pipe (9) and a second cooling pipe (10) located between the first cooling pipe (8) and the drain tank (16) in sequence from top to bottom. The invention relates to a first monitoring mechanism between a water tank (16); the hydrolyzed liquid discharge port (6) is connected to a second main pipe (18), and the other end of the second main pipe (18) is connected to a waste liquid pool (26); the second main pipe (18) is provided with a second cooling pipe (19) and a second monitoring mechanism located between the second cooling pipe (19) and the waste liquid pool (26) in sequence from top to bottom; the second monitoring mechanism is connected to a urea solution storage tank (29); the first monitoring mechanism and the second monitoring mechanism are both connected to a controller (30), and an alarm device is provided in the controller (30).

2. The urea hydrolyzer corrosion leakage online monitoring and alarm device according to claim 1 is characterized in that: A first water outlet (11) is arranged at the upper part of the first cooling pipe (8), and the first water outlet (11) is connected to a first water outlet pipe (12); a first water inlet (9) is arranged at the lower part of the first cooling pipe (8), and the first water inlet is connected to a first water inlet pipe (10).

3. The urea hydrolyzer corrosion leakage online monitoring and alarm device according to claim 1 is characterized in that: The first monitoring mechanism comprises a first online thermometer (13), a first main pipe valve (a), an online pH meter (14), and an online conductivity meter (15) which are sequentially arranged on a first main pipe (7); a first branch pipe (17) which is connected to a drain tank (16) is connected below the first online thermometer (13); and a first branch pipe valve (b) which is arranged in parallel with and used in conjunction with the first main pipe valve (a) is arranged on the first branch pipe (17).

4. The urea hydrolyzer corrosion leakage online monitoring and alarm device according to claim 3 is characterized in that: A second water outlet (22) is provided at the upper portion of the second cooling pipe (19), and the second water outlet (22) is connected to a second water outlet pipe (23); a second water inlet (20) is provided at the lower portion of the second cooling pipe (19), and the second water inlet (20) is connected to a second water inlet pipe (21).

5. The urea hydrolyzer corrosion leakage online monitoring and alarm device according to claim 4 is characterized in that: The second monitoring mechanism comprises a second online thermometer (24), a second main pipe valve (c), an online chlorine meter (25), and a third main pipe valve (e) which are sequentially arranged on the second main pipe (18); a second branch pipe (27) is connected below the second online thermometer (24), the other end of the second branch pipe (27) is connected to a waste liquid tank (26), and a second branch pipe valve (d) is arranged on the second branch pipe (27); a third branch pipe (28) is connected below the online chlorine meter (25), the other end of the third branch pipe (28) is connected to a urea solution storage tank (29), and a third branch pipe valve (f) is arranged on the third branch pipe (28).

6. The urea hydrolyzer corrosion leakage online monitoring and alarm device according to claim 5 is characterized by: The output ends of the first online thermometer (13), the online pH meter (14), the online conductivity meter (15), the second online thermometer (24), and the online chlorine meter (25) are all connected to a controller (30); and the controlled ends of the first main pipe valve (a), the first branch pipe valve (b), the second main pipe valve (c), the third main pipe valve (e), the second branch pipe valve (d), and the third branch pipe valve (f) are all connected to the controller (30).

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