Graded ammonia water recovery device

Abstract

The utility model relates to the technical field of ammonia water recovery treatment, in particular to a graded ammonia water recovery device which comprises a flash tank, a cooler, an ammonia water concentration meter, a concentrated ammonia water recovery line without analysis and a diluted ammonia water recovery line needing analysis, the flash tank is connected with a cooler through a guide pipe, the cooler is respectively connected with a stronger ammonia water branch pipe I and a dilute ammonia water branch pipe II through a conveying pipe provided with an ammonia water concentration meter, and the stronger ammonia water branch pipe I with a valve I is connected with a stronger ammonia water recovery line without analysis; a dilute ammonia water branch pipe II with a valve II is connected with a dilute ammonia water recovery line needing to be analyzed; the valve I and the valve II are electrically connected with an ammonia water concentration meter through a controller respectively; for ammonia water with different concentrations, strong ammonia water can be discharged into a strong ammonia water recovery line which does not need to be analyzed; or, the dilute ammonia water can be discharged into a dilute ammonia water recovery line needing to be resolved, so that the problems of high consumption of low-pressure steam and high load in the resolving process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia water recovery and treatment, in particular to a device for graded recovery of ammonia water. Background Art

[0002] In the urea production process, since the production capacity of the urea production device in each time period is different, the concentration of ammonia discharged in different time periods is also different. This causes the ammonia in different time periods that is pumped into the condenser through the flash tank to become ammonia water with different concentrations under the condensation effect of the condenser. One is dilute ammonia water with a lower concentration, and the other is ammonia water with a relatively high concentration. When treating these two ammonia waters with different concentrations, the concentrated ammonia water and the dilute ammonia water are generally mixed first, and then hydrolyzed and distilled by the analytical system to concentrate the ammonia water and then returned to the urea production device for use, so as to complete the treatment process of ammonia water with different concentrations.

[0003] However, the above recovery and treatment process of ammonia water of different concentrations still has the following defects: in the method of mixing concentrated ammonia water with dilute ammonia water, and then returning it to the production device after being processed by the analysis system, when the analysis system analyzes the mixed liquid of concentrated ammonia water and dilute ammonia water, it not only increases the load of the analysis system, but also consumes more low-pressure steam for analysis.

[0004] Therefore, it is necessary to improve and design the ammonia recovery line to solve the problem that when recovering different ammonia waters produced in the urea production device, concentrated ammonia water is mixed with dilute ammonia water, and then returned to the urea production device after being processed by the analysis system, resulting in a large amount of low-pressure steam consumed during the analysis process. Utility Model Content

[0005] The utility model aims to propose a device for recovering ammonia water in stages, so as to solve the problem that when recovering different ammonia waters produced in a urea production device, concentrated ammonia water is mixed with diluted ammonia water, and then the mixed ammonia water is returned to the urea production device after being processed by an analysis system, resulting in a large amount of low-pressure steam being consumed in the analysis process.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The device for graded recovery of ammonia water is used for graded treatment of ammonia water of different concentrations generated in the process of urea production, and comprises a flash tank, a cooler, an ammonia water concentration meter, a concentrated ammonia water recovery line that does not require analysis, and a dilute ammonia water recovery line that requires analysis; the flash tank is connected to the cooler through a guide pipe, the cooler is respectively connected to a concentrated ammonia water branch pipe 1 and a dilute ammonia water branch pipe 2 through a delivery pipe equipped with an ammonia water concentration meter, the concentrated ammonia water branch pipe 1 with a valve 1 is connected to the concentrated ammonia water recovery line that does not require analysis, the dilute ammonia water branch pipe 2 with a valve 2 is connected to the dilute ammonia water recovery line that requires analysis, and the valve 1 and the valve 2 are respectively electrically connected to the ammonia water concentration meter through a controller;

[0008] The concentrated ammonia water recovery line that does not require analysis includes a concentrated ammonia water collector, a concentrated ammonia water delivery pump and a urea production device input port 1; one end of the concentrated ammonia water collector is connected to a concentrated ammonia water branch pipe 1 through a concentrated ammonia water delivery pipe 1, and the other end of the concentrated ammonia water collector is connected to a valve 3, a concentrated ammonia water delivery pump and a urea production device input port 1 in sequence through a concentrated ammonia water delivery pipe 2;

[0009] The dilute ammonia water recovery line to be analyzed includes a dilute ammonia water storage tank, a dilute ammonia water delivery pump, an analysis system and a second input port of a urea production device; the top of the dilute ammonia water storage tank is connected to a dilute ammonia water branch pipe 2 through a dilute ammonia water delivery pipe 1, and the side wall of the dilute ammonia water storage tank is connected to a dilute ammonia water delivery pump, an analysis system and a second input port of a urea production device in sequence through a dilute ammonia water delivery pipe 2.

[0010] Furthermore, the top of the concentrated ammonia water collector is connected to the concentrated ammonia water storage tank through an overflow pipe with a valve four.

[0011] Furthermore, one side wall of the concentrated ammonia water delivery pipe is connected to the top of the concentrated ammonia water storage tank through a concentrated ammonia water guide pipe with a valve five, and the output end of the concentrated ammonia water guide pipe extends to the inside of the concentrated ammonia water storage tank.

[0012] Furthermore, the bottom side wall of the concentrated ammonia water storage tank is connected to the side wall of the concentrated ammonia water delivery pipe 2 through the concentrated ammonia water delivery pipe 3 with valve 6.

[0013] During the working process, when the ammonia gas in the flash tank is introduced into the cooler at different time periods, the cooler condenses the ammonia gas into ammonia water, and then flows along the delivery pipe to the ammonia water concentration meter, the ammonia water concentration meter monitors the concentration of the ammonia water; if the monitored ammonia water concentration is relatively concentrated, the ammonia water concentration meter opens the control valve of the controller, and the concentrated ammonia water flows along the concentrated ammonia water branch pipe 1 into the concentrated ammonia water delivery pipe 1, the concentrated ammonia water collector, the concentrated ammonia water delivery pump and the concentrated ammonia water delivery pipe 2 in sequence, and then flows into the urea production device to complete the recovery process of the concentrated ammonia water, so as to reduce the load of the analytical system and the consumption of low-pressure steam;

[0014] If the monitored ammonia concentration is relatively dilute, the ammonia concentration meter opens valve 2 through the controller control valve, and the dilute ammonia water flows along the dilute ammonia water branch pipe 2 into the dilute concentration ammonia water delivery pipe 1, the dilute ammonia water storage tank, the dilute ammonia water delivery pipe 2, the dilute ammonia water delivery pump and the analysis system in sequence, and then flows into the urea production device to complete the recovery process of the low-concentration ammonia water. In this way, compared with analyzing a large amount of a mixed liquid of high-concentration ammonia water and low-concentration ammonia water, the present application only needs to analyze a single and small amount of dilute ammonia water, which not only reduces the consumption of low-pressure steam required in the analysis process, but also reduces the load on the analysis system.

[0015] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0016] The utility model sets a concentrated ammonia water recovery line that does not need to be analyzed and a dilute ammonia water recovery line that needs to be analyzed. When treating ammonia water of different concentrations, the concentrated ammonia water can be discharged into the concentrated ammonia water recovery line that does not need to be analyzed for ammonia water of different concentrations. In this way, the load of the analysis system is reduced and the consumption of low-pressure steam is reduced; or the dilute ammonia water can be discharged into the dilute ammonia water recovery line that needs to be analyzed. In this way, compared with analyzing a mixed solution of concentrated ammonia water and dilute ammonia water with a large amount, the utility model only needs to analyze a single dilute ammonia water with a small amount, which not only reduces the consumption of low-pressure steam required in the analysis process, but also reduces the load of the analysis system, so as to solve the problem that when recovering and treating different ammonia waters produced in a urea production device, the concentrated ammonia water is mixed with the dilute ammonia water, and then returned to the urea production device after being processed by the analysis system, resulting in a large amount of low-pressure steam consumption in the analysis process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of a concentrated ammonia water recovery line that does not require analysis in the structure of the utility model.

[0019] Figure 3 This is a schematic diagram of the dilute ammonia water recovery line that needs to be analyzed for the structure of the utility model.

[0020] Figure 4 It is a schematic diagram of the connection between the concentrated ammonia water recovery line and the concentrated ammonia water storage tank that do not require analysis in the structure of the utility model.

[0021] Figure 5 It is a schematic diagram of the structure of the utility model.

[0022] In the figure, 1-flash tank, 2-cooler, 3-ammonia concentration meter, 4-concentrated ammonia recovery line without analysis, 5-dilute ammonia recovery line with analysis, 6-delivery pipe, 7-concentrated ammonia branch pipe one, 8-dilute ammonia branch pipe two, 9-concentrated ammonia collector, 10-concentrated ammonia delivery pipe one, 11-concentrated ammonia delivery pipe one, 12-valve three, 13-dilute ammonia storage tank, 14-dilute ammonia delivery pump, 15-analysis system, 16-dilute ammonia delivery pipe one, 17-dilute ammonia delivery pipe two, 18-valve four, 19-overflow pipe, 20-concentrated ammonia storage tank, 21-concentrated ammonia delivery pipe two, 22-valve five, 23-concentrated ammonia diversion pipe, 24-valve six, 25-ammonia delivery pipe. DETAILED DESCRIPTION

[0023] like Figure 1-5 In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Example

[0024] See also Figure 1 , used for graded treatment of ammonia water of different concentrations generated in the process of urea production, including a flash tank 1, a cooler 2, an ammonia concentration meter 3, a concentrated ammonia water recovery line 4 that does not require analysis, and a dilute ammonia water recovery line 5 that requires analysis; the flash tank 1 is connected to the cooler 2 through a guide pipe, the cooler 2 is connected to a concentrated ammonia water branch pipe 1 7 and a dilute ammonia water branch pipe 2 8 respectively through a delivery pipe 6 equipped with an ammonia concentration meter 3, the concentrated ammonia water branch pipe 1 7 with a valve 1 is connected to the concentrated ammonia water recovery line 4 that does not require analysis, the dilute ammonia water branch pipe 2 8 with a valve 2 is connected to the dilute ammonia water recovery line 5 that requires analysis, and the valve 1 and the valve 2 are electrically connected to the ammonia concentration meter 3 through a controller.

[0025] In actual use, when the ammonia gas in the flash tank 1 is introduced into the cooler 2 at different time periods, the cooler 2 converts the ammonia gas into ammonia water by condensation, and then flows along the conveying pipe 6 to the ammonia water concentration meter 3, and the ammonia water concentration meter 3 monitors the concentration of the ammonia water; if the monitored ammonia water concentration is relatively concentrated, the ammonia water concentration meter 3 opens the control valve through the controller, and the concentrated ammonia water flows directly into the concentrated ammonia water recovery line 4 without analysis along the branch pipe 7 for conveying concentrated ammonia water, thus reducing the load of the analysis system and the consumption of low-pressure steam;

[0026] If the monitored ammonia concentration is relatively dilute, the ammonia concentration meter 3 opens the controller control valve 2, and the dilute ammonia water flows directly into the dilute ammonia water recovery line 5 that still needs to be analyzed along the dilute ammonia water branch pipe 2 8. In this way, compared with analyzing a mixed solution of high-concentration ammonia water and low-concentration ammonia water in large amounts, the present application only needs to analyze a single and small amount of dilute ammonia water, which not only reduces the consumption of low-pressure steam required in the analysis process, but also reduces the load of the analysis system; in order to solve the problem that when recovering and processing different ammonia waters produced in the existing urea production device, the concentrated ammonia water and the dilute ammonia water are mixed, and then returned to the urea production device after being processed by the analysis system, resulting in a large amount of low-pressure steam consumption during the analysis process.

[0027] It should be noted that the ammonia concentration meter 3 is a prior art, which has been improved and designed, so its structure will not be described in detail.

[0028] It should be noted that the flash tank 1 and the cooler 2 are part of the equipment of the urea production device, and the connection relationship between the flash tank 1 and other equipment in the urea production device is the existing technology, which has not been improved or modified, so it will not be described in detail.

[0029] See also Figure 1-2 The concentrated ammonia water recovery line 4 for recovering concentrated ammonia water without analysis comprises a concentrated ammonia water collector 9, a concentrated ammonia water delivery pump 10 and an input port 1 of a urea production device; wherein the concentrated ammonia water collector 9 is used for temporarily storing concentrated ammonia water; the concentrated ammonia water delivery pump 10 is used for providing power for introducing concentrated ammonia water into the urea production device; the input port 1 of the urea production device is used for introducing high-concentration ammonia water into the urea production device, so as to achieve the purpose of reusing high-concentration ammonia water.

[0030] Specifically, one end of the concentrated ammonia water collector 9 is connected to the concentrated ammonia water branch pipe 17 through the concentrated ammonia water delivery pipe 11, and the other end of the concentrated ammonia water collector 9 is connected to the valve 3 12, the concentrated ammonia water delivery pump 10 and the urea production device input port 1 in sequence through the concentrated ammonia water delivery pipe 21.

[0031] In actual use, when concentrated ammonia water flows into the concentrated ammonia water recovery line 4 which does not need to be analyzed, the ammonia water concentration meter 3 controls the valve 1 of the concentrated ammonia water branch pipe 7 to be opened through the controller, and the concentrated ammonia water flows along the concentrated ammonia water delivery pipe 11 into the concentrated ammonia water collector 9 for buffering (controlling the amount subsequently introduced into the urea production device), and then the valve 3 12 and the concentrated ammonia water delivery pump 10 are opened, and the ammonia water buffered in the concentrated ammonia water collector 9 flows along the concentrated ammonia water delivery pipe 21 into the urea production device to complete the recovery process of the concentrated ammonia water.

[0032] In this process, concentrated ammonia water directly flows back to the urea production device through the concentrated ammonia water recovery line 4 which does not require analysis, and does not need to go through the analysis process in the middle, which not only reduces the load of the analysis system, but also reduces the consumption of low-pressure steam. At the same time, the concentrated ammonia water is recycled and utilized, achieving the purpose of green energy saving and having wide practicality.

[0033] See also Figure 1 and Figure 3 The dilute ammonia water recovery line 5 for recovering and treating the dilute ammonia water and requiring analysis comprises a dilute ammonia water storage tank 13, a dilute ammonia water delivery pump 14, an analysis system 15 and a second input port of a urea production device; wherein the dilute ammonia water storage tank 13 is used for temporarily storing the dilute ammonia water; the analysis system 15 is used for hydrolyzing and distilling the dilute ammonia water to increase the concentration of the dilute ammonia water; the second input port of the urea production device is used for introducing the concentrated dilute ammonia water into the urea production device to achieve the purpose of reusing the dilute ammonia water.

[0034] Specifically, the top of the dilute ammonia water storage tank 13 is connected to the dilute ammonia water branch pipe 2 8 through the dilute ammonia water delivery pipe 1 16 , and the side wall of the dilute ammonia water storage tank 13 is connected to the dilute ammonia water delivery pump 14 , the analytical system 15 and the urea production device input port 2 in sequence through the dilute ammonia water delivery pipe 2 17 .

[0035] In actual use, when the dilute ammonia water flows into the dilute ammonia water recovery line that needs to be analyzed, the ammonia water concentration meter 3 controls the valve 2 of the dilute ammonia water branch pipe 2 8 to be opened through the controller, and the dilute ammonia water flows along the dilute ammonia water branch pipe 2 8 and the dilute concentrated ammonia water delivery pipe 1 16 into the dilute ammonia water storage tank 13 for temporary storage, and then flows into the analysis system 15 through the cooperation of the dilute ammonia water delivery pipe 2 17 and the dilute ammonia water delivery pump 14 for hydrolysis and distillation, so that the concentration of the dilute ammonia water is raised to a concentration suitable for discharge into the urea production device, and then discharged into the urea production device along the dilute ammonia water delivery pipe 2 17 to complete the recovery and treatment process of low-concentration ammonia water.

[0036] In this process, the dilute ammonia water flows into the urea production unit through the dilute ammonia water recovery line to be analyzed. Although the dilute ammonia water still needs to be hydrolyzed and distilled and concentrated through the analysis system, compared with analyzing a mixed liquid of concentrated ammonia water and dilute ammonia water with a large amount, only a single and small amount of dilute ammonia water needs to be analyzed, which not only reduces the consumption of low-pressure steam required in the analysis process, but also reduces the load of the analysis system.

[0037] It should be noted that the analytical system 15 and the urea production device are both existing technologies in the chemical industry, and no improvement or design has been made thereto, so their structures are not described in detail.

[0038] See also Figure 4-5 In order to prevent the concentrated ammonia water collector 9 from being full, the top of the concentrated ammonia water collector 9 is connected to the concentrated ammonia water storage tank 20 through an overflow pipe 19 with a valve 18.

[0039] In actual use, when the concentrated ammonia water collector 9 is about to be full, the concentrated ammonia water in the concentrated ammonia water collector 9 will flow along the overflow pipe 19 into the concentrated ammonia water storage tank 20 for temporary storage, so that the liquid level of the ammonia water in the concentrated ammonia water collector 9 will be lowered, avoiding the risk of the concentrated ammonia water collector 9 being full and ensuring the stability of the operation of the entire production device.

[0040] It should be noted that, in order to prevent the ammonia water in the concentrated ammonia water storage tank 20 from flowing back into the concentrated ammonia water collector 9, a valve four 18 is also provided on the overflow pipe 19; when the overflow pipe 19 is in an overflow state, the valve four 18 is in an open state, otherwise, the valve four 18 is in a closed state.

[0041] See also Figure 4-5 In order to prevent excessive ammonia water from flowing into the concentrated ammonia water collector 9, resulting in the concentrated ammonia water collector 9 being unable to store the concentrated ammonia water, the side wall of the concentrated ammonia water delivery pipe 11 is connected to the top of the concentrated ammonia water storage tank 20 through the concentrated ammonia water guide pipe 23, and the output end of the concentrated ammonia water guide pipe 23 extends to the inside of the concentrated ammonia water storage tank 20, wherein the concentrated ammonia water guide pipe 23 is also provided with a valve 5 22.

[0042] In actual use, when the concentrated ammonia water collector cannot store the concentrated ammonia water introduced along the concentrated ammonia water delivery pipe 11, the valve 22 on the concentrated ammonia water guide pipe 23 can be opened, and the concentrated ammonia water will be introduced into the concentrated ammonia water storage tank 17 along the ammonia water guide pipe 23 for temporary storage, thereby avoiding the situation where the storage capacity of the concentrated ammonia water collector 9 is low.

[0043] See also Figure 4-5 When the urea production device stops operating, in order to discharge the residual concentrated ammonia water in the concentrated ammonia water collector 9, the bottom side wall of the concentrated ammonia water storage tank 17 is connected to the side wall of the concentrated ammonia water delivery pipe 21 through an ammonia water delivery pipe 25, wherein the ammonia water delivery pipe 25 is also provided with a valve 6 24.

[0044] In actual use, when the residual ammonia water in the concentrated ammonia water collector is discharged, the valve three 12 is closed first, and then the valve six 24 is opened, and the ammonia water in the concentrated ammonia water collector 9 flows along the concentrated ammonia water delivery pipe 25 into the concentrated ammonia water storage tank 17 for temporary storage, so as to prepare for the subsequent use of urea preparation again.

[0045] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to the modifications and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A device for graded recovery of aqueous ammonia, used for graded treatment of aqueous ammonia of different concentrations produced in the urea production process, characterized by: The invention comprises a flash tank (1), a cooler (2), an ammonia concentration meter (3), a concentrated ammonia recovery line (4) that does not require analysis, and a dilute ammonia recovery line (5) that requires analysis; the flash tank (1) is connected to the cooler (2) via a guide pipe; the cooler (2) is connected to a concentrated ammonia branch pipe (7) and a dilute ammonia branch pipe (8) via a delivery pipe (6) equipped with an ammonia concentration meter (3); the concentrated ammonia branch pipe (7) with a valve (1) is connected to the concentrated ammonia recovery line (4) that does not require analysis; the dilute ammonia branch pipe (8) with a valve (2) is connected to the dilute ammonia recovery line (5) that requires analysis; the valve (1) and the valve (2) are electrically connected to the ammonia concentration meter (3) via a controller; The concentrated ammonia water recovery line (4) that does not require analysis comprises a concentrated ammonia water collector (9), a concentrated ammonia water delivery pump (10) and a first input port of a urea production device; one end of the concentrated ammonia water collector (9) is connected to a first concentrated ammonia water branch pipe (7) via a first concentrated ammonia water delivery pipe (11), and the other end of the concentrated ammonia water collector (9) is connected to a third valve (12), a concentrated ammonia water delivery pump (10) and a first input port of a urea production device in sequence via a second concentrated ammonia water delivery pipe (21); The dilute ammonia water recovery line (5) to be analyzed comprises a dilute ammonia water storage tank (13), a dilute ammonia water delivery pump (14), a decomposition system (15) and a second inlet of a urea production device; the top of the dilute ammonia water storage tank (13) is connected to a second dilute ammonia water branch pipe (8) via a first dilute ammonia water delivery pipe (16), and the side wall of the dilute ammonia water storage tank (13) is connected to the dilute ammonia water delivery pump (14), the decomposition system (15) and a second inlet of a urea production device via a second dilute ammonia water delivery pipe (17).

2. The device for recovering aqueous ammonia by grading according to claim 1, characterized in that: The top of the concentrated ammonia water collector (9) is connected to the concentrated ammonia water storage tank (20) via an overflow pipe (19) with a valve four (18).

3. The device for recovering aqueous ammonia by graded recovery according to claim 1, characterized in that: The side wall of the concentrated ammonia water delivery pipe 1 (11) is connected to the top of the concentrated ammonia water storage tank (20) through a concentrated ammonia water guide pipe (23) with a valve 5 (22), and the output end of the concentrated ammonia water guide pipe (23) extends to the inside of the concentrated ammonia water storage tank (20).

4. The device for recovering aqueous ammonia by graded recovery according to claim 3, characterized in that: The bottom side wall of the concentrated ammonia water storage tank (20) is connected to the side wall of the concentrated ammonia water delivery pipe (21) through the concentrated ammonia water delivery pipe (25) with valve six (24).

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