Ammonia nitrogen evaporation removal system for coking residual ammonia water

Abstract

The utility model belongs to the technical field of ammonia nitrogen removal of coking residual ammonia water, and particularly relates to a coking residual ammonia water ammonia nitrogen evaporation removal system, which is characterized in that ammonia evaporation wastewater can be introduced into a to-be-used ammonia evaporation tower by opening a corresponding flushing valve before tower pouring, so that a tower tray in the ammonia evaporation tower is flushed in advance, and the temperature of the ammonia evaporation tower is raised; therefore, the ammonia distillation wastewater can be immediately ensured to be qualified during tower pouring, and the tower pouring operation efficiency is greatly improved; moreover, the steam combined with the residual ammonia water comes from qualified ammonia distillation wastewater generated by the steam, so that the amount of external steam introduced into the ammonia distillation tower is greatly reduced, the ammonia distillation wastewater is effectively utilized, the amount of the ammonia distillation wastewater generated by the system is also greatly reduced, and the subsequent treatment pressure on the ammonia distillation wastewater is relieved.

Description

Technical Field

[0001] The utility model relates to a system for removing ammonia nitrogen from residual ammonia water in coking, belonging to the technical field of removing ammonia nitrogen from residual ammonia water in coking. Background Art

[0002] During the coking process in the coking plant, the ammonia water produced will contain toxic and harmful substances such as ammonia, phenol, sulfide, cyanide, pyridine and tar. Part of the ammonia water will be circulated back to the coke oven riser to spray the coke oven gas. This part is called circulating ammonia water. In addition to the circulating ammonia water, the rest is called residual ammonia water. The residual ammonia water can only be treated and sent to the subsequent biochemical treatment system. The treatment of residual ammonia water generally adopts steam ammonia distillation, which uses steam as a carrier and uses the distillation method to transfer the ammonia nitrogen dissolved in the water into the steam, thereby achieving the purpose of removing ammonia nitrogen.

[0003] The traditional system for removing ammonia nitrogen from residual ammonia water mainly includes an ammonia evaporation tower. By introducing steam into the ammonia evaporation tower, the residual ammonia water introduced into the ammonia evaporation tower is subjected to ammonia nitrogen evaporation treatment at the tower plate. The generated ammonia evaporation wastewater falls to the bottom of the ammonia evaporation tower and is pumped out by the wastewater pump into the water treatment system. In order to ensure the continuous operation of the system, two ammonia evaporation towers are usually set up to cooperate with each other and be recycled. Therefore, the tower inversion process is often involved in the operation of the system. During each tower inversion process, due to the low temperature of the newly used ammonia evaporation tower and the large amount of tar adhered to the tower plate of the ammonia evaporation tower, the treatment effect of the residual ammonia water and ammonia nitrogen is poor, resulting in unqualified ammonia nitrogen treatment. It usually takes nearly 1 to 2 hours to invert the tower to pass the ammonia evaporation wastewater, and the inversion operation efficiency is low; and the method of introducing external steam into the ammonia evaporation tower will cause a large amount of condensed water to be generated in the ammonia evaporation tower, which will increase the amount of ammonia evaporation wastewater generated and increase the subsequent treatment pressure of ammonia evaporation wastewater. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a coking residual ammonia water and ammonia nitrogen removal system which can improve the efficiency of the tower inversion operation and effectively utilize the ammonia evaporation wastewater.

[0005] The present invention discloses a system for removing ammonia nitrogen from coking residual ammonia, comprising a residual ammonia supply pipeline, a steam supply pipeline, a wastewater treatment pipeline and two ammonia distillation towers, wherein the residual ammonia supply pipeline is connected with a main ammonia delivery pipeline, the main ammonia delivery pipeline is connected with ammonia inlets of the two ammonia distillation towers through two branch ammonia delivery pipelines, the two branch ammonia delivery pipelines are connected with an ammonia control valve, the steam supply pipeline is connected with steam inlets of the two ammonia distillation towers through two steam delivery pipelines, the wastewater treatment pipeline is connected with a main drainage pipe, the main drainage pipe is connected with two first drainage pipes, and the first drainage pipe is connected with ammonia control valve. The inner bottoms of the two ammonia distillation towers are respectively connected, and a drainage pump assembly is connected to the main drainage pipe; the utility model also includes two steam reboilers, and the lower ends of the side walls of the two ammonia distillation towers are provided with overflow ports, the two overflow ports are respectively connected to the liquid inlets of the two steam reboilers through two overflow pipes, and the gas outlets of the two steam reboilers are respectively connected to the two steam inlets through two gas pipes, and the main drainage pipe located at the output end of the drainage pump assembly is connected to a main flushing pipe, and the main flushing pipe is respectively connected to the two ammonia water inlets through two branch flushing pipes, and the two branch flushing pipes are connected to flushing valves.

[0006] Furthermore, the heat medium inlet of the steam reboiler is connected to the steam delivery pipe through a heat medium delivery pipe, the heat medium delivery pipe is connected to a heat medium control valve, the steam delivery pipe is connected to a steam control valve, and the steam control valve is located downstream of the connection node between the heat medium delivery pipe and the steam delivery pipe.

[0007] Furthermore, the drainage pump assembly includes two second drainage pipes, and the two second drainage pipes are sequentially connected with a water inlet control valve and a drainage pump from front to back.

[0008] Furthermore, the second drainage pipe is connected to a pressure gauge, which is located at the output end of the drainage pump.

[0009] Furthermore, the second drainage pipe is connected to a water outlet control valve, and the water outlet control valve is located downstream of the pressure gauge.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The ammonia nitrogen evaporation system for residual ammonia water in coking described in the utility model can lead the ammonia evaporation wastewater into the ammonia evaporation tower to be used by opening the corresponding flushing valve before the tower is inverted, so as to flush the tower tray in the ammonia evaporation tower in advance and heat the ammonia evaporation tower, so as to immediately ensure that the ammonia evaporation wastewater is qualified when the tower is inverted, thereby greatly improving the tower inverting operation efficiency; and, the steam combined with the residual ammonia water comes from the qualified ammonia evaporation wastewater generated by itself, which greatly reduces the amount of external steam introduced into the ammonia evaporation tower, not only effectively utilizes the ammonia evaporation wastewater, but also greatly reduces the amount of ammonia evaporation wastewater generated by the system, thereby alleviating the subsequent treatment pressure on the ammonia evaporation wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the prior art.

[0014] In the figure: 1. Residual ammonia water supply pipeline; 2. Main ammonia water delivery pipe; 3. Ammonia distillation tower; 4. Ammonia water inlet; 5. Branch ammonia water delivery pipe; 6. Ammonia water control valve; 7. Flushing valve; 8. Branch flushing pipe; 9. Tower plate; 10. Steam supply pipeline; 11. Steam delivery pipe; 12. Steam control valve; 13. Steam inlet; 14. Gas pipeline; 15. Heat medium delivery pipe; 16. Heat medium control valve; 17. Heat medium inlet; 18. Steam reboiler; 19. Overflow pipe; 20. Overflow port; 21. Wastewater treatment pipeline; 22. Main drain pipe; 23. Second branch drain pipe; 24. Water outlet control valve; 25. Pressure gauge; 26. Drain pump; 27. Water inlet control valve; 28. Main flushing pipe; 29. ​​First branch drain pipe. DETAILED DESCRIPTION

[0015] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0016] Embodiment 1:

[0017] like Figure 1 As shown, the coking residual ammonia and ammonia nitrogen evaporation system described in the utility model comprises a residual ammonia supply pipeline 1, a steam supply pipeline 10, a wastewater treatment pipeline 21 and two ammonia stills 3, the residual ammonia supply pipeline 1 is connected to a main ammonia delivery pipe 2, the main ammonia delivery pipe 2 is connected to the ammonia inlet 4 of the two ammonia stills 3 through two branch ammonia delivery pipes 5, the two branch ammonia delivery pipes 5 are connected to an ammonia control valve 6, the steam supply pipeline 10 is connected to the steam inlet 13 of the two ammonia stills 3 through two steam delivery pipes 11, the wastewater treatment pipeline 21 is connected to a main drainage pipe 22, the main drainage pipe 22 is connected to the first drainage pipe 22 through two first drainage pipes 2 9 are respectively connected to the inner bottom of the two ammonia distillation towers 3, and a drainage pump assembly is connected to the main drainage pipe 22; the utility model also includes two steam reboilers 18, and the lower ends of the side walls of the two ammonia distillation towers 3 are provided with overflow ports 20, and the two overflow ports 20 are respectively connected to the liquid inlets of the two steam reboilers 18 through two overflow pipes 19, and the gas outlets of the two steam reboilers 18 are respectively connected to the two steam inlets 13 through two gas pipes 14, and the main drainage pipe 22 located at the output end of the drainage pump assembly is connected to a main flushing pipe 28, and the main flushing pipe 28 is respectively connected to the two ammonia water inlets 4 through two branch flushing pipes 8, and the two branch flushing pipes 8 are connected to flushing valves 7.

[0018] When the operation is started, the steam supply pipeline 10 passes steam into the ammonia still 3 through the steam delivery pipe 11 and the steam inlet 13, and the residual ammonia water supply pipeline 1 passes the residual ammonia water into the ammonia still 3 through the main ammonia water delivery pipe 2, the branch ammonia water delivery pipe 5 and the ammonia water inlet 4. The steam and the residual ammonia water are combined in the ammonia still 3, so as to remove the ammonia nitrogen in the residual ammonia water. The ammonia still waste water after the ammonia nitrogen is removed falls to the bottom of the ammonia still 3. When the liquid level of the ammonia still waste water reaches the overflow port 20, the ammonia still waste water flows into the steam reboiler 18. The steam reboiler 18 converts the ammonia still waste water into steam again to participate in the removal of the residual ammonia water. After the system is stable, the operation can be stopped. The steam supply pipe 10 introduces steam into the ammonia evaporation tower 3. At the same time, part of the generated ammonia evaporation wastewater generates steam through the steam reboiler 18, and the other part is transported to the wastewater treatment pipeline 21 for subsequent treatment under the action of the drainage pump assembly; when the tower needs to be inverted, the corresponding flushing valve 7 is opened in advance, and part of the ammonia evaporation wastewater will enter the ammonia evaporation tower 3 through the main flushing pipe 28, the branch flushing pipe 8 and the ammonia water inlet 4, so as to flush the tower plate 9 in the ammonia evaporation tower 3 in advance, and heat the ammonia evaporation tower 3, and at the same time provide a steam source for the steam reboiler 18. When the tower is inverted, the ammonia water control valve 6 can be directly switched, and the system can operate normally immediately.

[0019] The ammonia nitrogen evaporation system for coking residual ammonia water described in the utility model can lead the ammonia evaporation waste water into the ammonia evaporation tower 3 to be used by opening the corresponding flushing valve 7 before the tower is turned over, so as to flush the tower tray 9 in the ammonia evaporation tower 3 in advance and heat the ammonia evaporation tower 3, so as to immediately ensure that the ammonia evaporation waste water is qualified when the tower is turned over, thereby greatly improving the tower turning operation efficiency; and, the steam combined with the residual ammonia water comes from the qualified ammonia evaporation waste water generated by itself, which greatly reduces the amount of external steam introduced into the ammonia evaporation tower 3, not only effectively utilizes the ammonia evaporation waste water, but also greatly reduces the amount of ammonia evaporation waste water generated by the system, thereby alleviating the subsequent treatment pressure of the ammonia evaporation waste water.

[0020] Embodiment 2:

[0021] like Figure 1 As shown, based on Example 1,

[0022] Furthermore, the heat medium inlet 17 of the steam reboiler 18 is connected to the steam delivery pipe 11 through the heat medium delivery pipe 15, the heat medium delivery pipe 15 is connected to the heat medium control valve 16, the steam delivery pipe 11 is connected to the steam control valve 12, and the steam control valve 12 is located downstream of the connection node between the heat medium delivery pipe 15 and the steam delivery pipe 11, so that the heat medium of the steam reboiler 18 and the ammonia distillation tower 3 share the same steam source, which can effectively reduce the system cost;

[0023] Furthermore, the drainage pump assembly includes two second drainage pipes 23, and the two second drainage pipes 23 are sequentially connected with a water inlet control valve 27 and a drainage pump 26 from front to back. One of the two drainage pumps 26 is in operation and the other is in standby, thereby ensuring the normal operation of the system;

[0024] Furthermore, the second drainage pipe 23 is connected with a pressure gauge 25, which is located at the output end of the drainage pump 26 and can monitor the drainage pressure of the drainage pump 26;

[0025] Furthermore, a water outlet control valve 24 is connected to the second drainage pipe 23 . The water outlet control valve 24 is located downstream of the pressure gauge 25 . The drainage pressure of the drainage pump 26 can be adjusted by adjusting the water outlet control valve 24 .

Claims

1. A system for removing ammonia nitrogen from coking residual ammonia water, comprising a residual ammonia water supply pipeline (1), a steam supply pipeline (10), a wastewater treatment pipeline (21) and two ammonia stills (3), wherein the residual ammonia water supply pipeline (1) is connected to a main ammonia water delivery pipeline (2), the main ammonia water delivery pipeline (2) is connected to ammonia water inlets (4) of the two ammonia stills (3) through two branch ammonia water delivery pipelines (5), the two branch ammonia water delivery pipelines (5) are both connected to an ammonia water control valve (6), the steam supply pipeline (10) is connected to steam inlets (13) of the two ammonia stills (3) through two steam delivery pipelines (11), the wastewater treatment pipeline (21) is connected to a main drainage pipe (22), the main drainage pipe (22) is connected to the inner bottom of the two ammonia stills (3) through two first drainage pipes (29), and a drainage pump assembly is connected to the main drainage pipe (22), characterized in that: The invention also comprises two steam reboilers (18). The lower ends of the side walls of the two ammonia distillation towers (3) are each provided with an overflow port (20). The two overflow ports (20) are respectively connected to the liquid inlets of the two steam reboilers (18) through two overflow pipes (19). The gas outlets of the two steam reboilers (18) are respectively connected to the two steam inlets (13) through two gas transmission pipes (14). The main flushing pipe (28) is connected to the main drainage pipe (22) at the output end of the drainage pump assembly. The main flushing pipe (28) is respectively connected to the two ammonia water inlets (4) through two branch flushing pipes (8). The two branch flushing pipes (8) are each connected to a flushing valve (7).

2. The system for removing ammonia nitrogen from coking excess ammonia water according to claim 1, characterized in that: The heat medium inlet (17) of the steam reboiler (18) is connected to the steam delivery pipe (11) via the heat medium delivery pipe (15); the heat medium delivery pipe (15) is connected to a heat medium control valve (16); the steam delivery pipe (11) is connected to a steam control valve (12); the steam control valve (12) is located downstream of a connection node between the heat medium delivery pipe (15) and the steam delivery pipe (11).

3. The system for removing ammonia nitrogen from coking excess ammonia water according to claim 1 or 2, characterized in that: The drainage pump assembly comprises two second drainage pipes (23), and the two second drainage pipes (23) are sequentially connected with a water inlet control valve (27) and a drainage pump (26) from front to back.

4. The system for removing ammonia nitrogen from coking excess ammonia water according to claim 3, characterized in that: The second drainage pipe (23) is connected to a pressure gauge (25), and the pressure gauge (25) is located at the output end of the drainage pump (26).

5. The system for removing ammonia nitrogen from coking excess ammonia water according to claim 4, characterized in that: The second drainage pipe (23) is connected to a water outlet control valve (24), and the water outlet control valve (24) is located downstream of the pressure gauge (25).

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