A water cycle system for reducing the load of resolving hydrolysis

Abstract

The utility model discloses a water circulation system for reducing analytic hydrolysis load relates to urea synthetic technical field, including sealed water tank, sealed water pump, sealed water cooler, high pressure ammonia pump, sealed water tank's export is connected with sealed water pump, and sealed water pump's export is connected with sealed water cooler, sealed water cooler's export is connected with high pressure ammonia pump, and the pump export pipeline connection of high pressure ammonia pump has first sealed water delivery pipeline, and first sealed water delivery pipeline is connected with analytic hydrolysis system, and first sealed water delivery pipeline is connected with sealed water tank through sealed water return pipeline, and the pipeline of sealed water tank's export is connected is provided with electric conductivity instrument, the utility model discloses can avoid sealed water long flow to analytic hydrolysis system, greatly reduces analytic hydrolysis system's load and steam consumption to realize the circulation use when sealed water ammonia content is lower.

Description

Technical Field

[0001] This utility model relates to the field of urea synthesis technology, specifically a water circulation system for reducing the hydrolysis load. Background Technology

[0002] Urea synthesis systems operate at high reaction pressures, therefore high-pressure liquid ammonia pumps are commonly used to pressurize the liquid ammonia used in the urea reaction. To prevent direct leakage of ammonia into the environment in case of leaks at the pump's sealing points, a sealing water system is installed. Clean demineralized water is used to seal the sealing points, carrying away any leaks and preventing environmental hazards. During operation, excess ammonia-containing aqueous solutions are also sent to the ammonia tank of the urea desorption and hydrolysis system. Simultaneously, the sealing water from the liquid ammonia pumps is also sent to the urea desorption and hydrolysis system for treatment, recovering the ammonia. However, when the liquid ammonia pumps are not leaking, this water contains virtually no ammonia. Its entry into the ammonia tank would significantly increase the operating load of the desorption and hydrolysis system, increasing steam consumption and wasting resources. Utility Model Content

[0003] This invention overcomes the shortcomings of the prior art by proposing a water circulation system for reducing the load of hydrolysis and desorption, enabling the recycling of sealed water when the ammonia content is low, thereby reducing the operating load and steam consumption of the hydrolysis and desorption system.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: A water circulation system for reducing the load of hydrolysis analysis includes a sealed water tank, a sealed water pump, a sealed water cooler, and a high-pressure ammonia pump. The outlet of the sealed water tank is connected to the sealed water pump, and the outlet of the sealed water pump is connected to the sealed water cooler. The outlet of the sealed water cooler is connected to the high-pressure ammonia pump. The pump outlet pipeline of the high-pressure ammonia pump is connected to a first sealed water delivery pipeline, which is connected to the hydrolysis analysis system. The first sealed water delivery pipeline is connected to the sealed water tank through a sealed water return pipeline. A conductivity meter is installed on the pipeline connected to the outlet of the sealed water tank.

[0005] Furthermore, the sealing water return pipeline is connected to a second sealing water external delivery pipeline; the second sealing water external delivery pipeline is connected to the hydrolysis system.

[0006] Furthermore, a temperature gauge is installed on the sealed water return pipe.

[0007] Furthermore, the outlet of the sealed water tank is connected to two sealed water pumps, which are connected in parallel.

[0008] Furthermore, a pressure gauge is installed at the outlet of the sealed water pump.

[0009] Furthermore, the sealed water tank is connected to the demineralized water supply equipment via a first pipeline, which is equipped with a demineralized water regulating valve.

[0010] Furthermore, a level gauge is installed inside the sealed water tank.

[0011] Furthermore, it also includes remote monitoring instruments and regulation and control systems.

[0012] The beneficial effects of this utility model compared to the prior art are as follows: 1. By adding a sealing water circulation system, this utility model can achieve the purpose of recycling the ammonia concentration in the sealing water of the ammonia pump when it is less than 10%, thus avoiding the continuous flow of sealing water to the hydrolysis system and greatly reducing the load and steam consumption of the hydrolysis system (it is expected to reduce the load of the hydrolysis system by 8t / h).

[0013] 2. This system is equipped with remote monitoring instruments and adjustment control systems, which can realize monitoring and operation in the central control room, reducing the workload of on-site inspection personnel. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the water circulation system for reducing the hydrolysis load described in this utility model; The labels shown in the attached diagram: 1. Sealed water tank; 2. Sealed water pump; 3. Sealed water cooler; 4. High-pressure ammonia pump; 5. First pipeline; 6. Demineralized water regulating valve; 7. Level gauge; 8. Pressure gauge; 9. Second pipeline; 10. First sealing water delivery pipeline; 11. Second sealing water delivery pipeline; 12. Sealed water return pipeline; 13. Thermometer; 14. Conductivity meter. Detailed Implementation

[0015] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0016] See Figure 1 This embodiment proposes a water circulation system for reducing the hydrolysis load, including a sealed water tank 1, two sealed water pumps 2 (one operational and one standby), a sealed water cooler 3, and a high-pressure ammonia pump 4. The sealed water tank 1 is used for buffering the sealed water, which is sourced from the production plant's demineralized water system. The sealed water pumps 2 provide power for the sealed water circulation, and the sealed water cooler 3 controls the temperature of the sealed water; lower temperature sealed water is more conducive to the absorption of leaked ammonia.

[0017] The sealed water tank 1 is connected to the demineralized water supply equipment via a first pipeline 5. A demineralized water regulating valve 6 is installed on the first pipeline 5, and a level gauge 7 is installed inside the sealed water tank 1. The demineralized water supply is controlled by the demineralized water regulating valve 6, and demineralized water is added to the sealed water tank 1. The level is monitored using the level gauge 7. The outlet of the sealed water tank 1 is connected to two sealed water pumps 2, which are connected in parallel, allowing one to operate while the other is on standby. A pressure gauge 8 is installed at the outlet of each sealed water pump 2, which is also connected to a sealed water cooler 3. The sealed water is cooled by the sealed water cooler 3 to maintain its temperature at room temperature. The cooling medium for the sealed water cooler 3 can be the circulating water within the unit area. The outlet of the sealed water cooler 3 is connected to a high-pressure ammonia pump 4 via a second pipeline 9. The cooled sealed water is then transported to the sealing point of the high-pressure ammonia pump 4 for sealed circulation.

[0018] The pump outlet pipeline of the high-pressure ammonia pump 4 is connected to a first sealing water delivery pipeline 10, which is connected to the sealing water tank 1 via a sealing water return pipeline 12. The sealing water return pipeline 12 is connected to a second sealing water delivery pipeline 11. The first sealing water delivery pipeline 10 and the second sealing water delivery pipeline 11 are connected to the hydrolysis system. A thermometer 13 is installed on the sealing water return pipeline 12, and a conductivity meter 14 is installed on the pipeline connected to the outlet of the sealing water tank 1.

[0019] It should be noted that control valves are installed on each delivery pipeline; When the ammonia content of the sealing water reaches 10% or higher, the sealing water is sent to the hydrolysis system through the first sealing water delivery pipeline 10 and / or the second sealing water delivery pipeline 11 to recover ammonia, while simultaneously replenishing the sealing water tank with demineralized water. In this system, a thermometer 13 is installed on the sealing water return pipeline 12, and a conductivity meter 14 is installed on the inlet pipeline of the sealing water pump 2. The system is equipped with sampling and analysis points, and changes in the ammonia content of the sealing water are monitored through changes in these two online indicators and the sampling and analysis results. This system is equipped with remote monitoring instruments and a control system, enabling monitoring and operation from the central control room, reducing the workload of on-site inspection personnel. Both the remote monitoring instruments and the control system are existing conventional control systems.

[0020] This embodiment proposes the working principle of a water circulation system for reducing the hydrolysis load: The demineralized water replenishment is controlled using the demineralized water regulating valve 6, replenishing demineralized water to the sealing water tank 1. The liquid level is monitored using the level gauge 7. The sealing water pump 2 is started to deliver sealing water. The sealing water is cooled by the sealing water cooler 3 to maintain its temperature at room temperature. The cooling medium for the sealing water cooler 3 can be the circulating water within the unit area. The cooled sealing water is then transported to the sealing point of the high-pressure ammonia pump 4 for sealing circulation. Simultaneously, a first sealing water delivery pipeline 10 and a second sealing water delivery pipeline 11 are installed on the outlet pipeline of the high-pressure ammonia pump 4 and the sealing water return pipeline. When the ammonia content in the sealing water reaches 10% or higher, the sealing water is sent to the hydrolysis system to recover ammonia, while demineralized water is replenished to the sealing water tank. In this system, a thermometer 13 is installed on the sealing water return pipeline, and a conductivity meter 14 is installed on the inlet pipeline of the sealing water pump 2. Sampling and analysis points are set up in the system to monitor changes in the ammonia content of the sealing water through changes in these two online indicators and the sampling and analysis results.

[0021] By adding a sealing water circulation system, the ammonia concentration in the sealing water of the ammonia pump can be circulated when it is less than 10%, thus avoiding the continuous flow of sealing water to the hydrolysis system and greatly reducing the load and steam consumption of the hydrolysis system (it is expected to reduce the load of the hydrolysis system by 8t / h).

[0022] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A water circulation system for reducing the hydrolysis load, characterized in that, It includes a sealed water tank (1), a sealed water pump (2), a sealed water cooler (3), and a high-pressure ammonia pump (4); the outlet of the sealed water tank (1) is connected to the sealed water pump (2), and the outlet of the sealed water pump (2) is connected to the sealed water cooler (3); the outlet of the sealed water cooler (3) is connected to the high-pressure ammonia pump (4); the pump outlet pipeline of the high-pressure ammonia pump (4) is connected to a first sealed water delivery pipeline (10), and the first sealed water delivery pipeline (10) is connected to the hydrolysis system; the first sealed water delivery pipeline (10) is connected to the sealed water tank (1) through a sealed water return pipeline (12); a conductivity meter (14) is installed on the pipeline connected to the outlet of the sealed water tank (1).

2. A water circulation system for reducing hydrolysis load according to claim 1, characterized in that, The sealing water return pipeline (12) is connected to the second sealing water delivery pipeline (11); the second sealing water delivery pipeline (11) is connected to the hydrolysis system.

3. A water circulation system for reducing hydrolysis load according to claim 1 or 2, characterized in that, A thermometer (13) is installed on the sealed water return pipe (12).

4. A water circulation system for reducing hydrolysis load according to claim 1, characterized in that, The outlet of the sealed water tank (1) is connected to two sealed water pumps (2), which are connected in parallel.

5. A water circulation system for reducing hydrolysis load according to claim 4, characterized in that, A pressure gauge (8) is installed at the outlet of the sealed water pump (2).

6. A water circulation system for reducing hydrolysis load according to claim 1, characterized in that, The sealed water tank (1) is connected to the demineralized water supply equipment through the first pipeline (5), and a demineralized water regulating valve (6) is installed on the first pipeline (5).

7. A water circulation system for reducing hydrolysis load according to claim 6, characterized in that, A level gauge (7) is installed inside the sealed water tank (1).

8. A water circulation system for reducing hydrolysis load according to claim 1, characterized in that, It also includes remote monitoring instruments and regulation and control systems.

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