Safe treatment system for ammonia water preparation

Abstract

The utility model discloses a safe treatment system for ammonia water preparation, and belongs to the technical field of ammonia chemical industry. According to the technical scheme, the device comprises a mixing tank, an ammonia water diluter and a controller, the mixing tank is arranged at the top of the ammonia water diluter and is connected with a desalted water inlet pipeline; the ammonia water diluter is sequentially provided with a first-stage cooling area, a second-stage mixing area and a second-stage cooling area from top to bottom, and an ammonia water discharging pipeline is arranged at the bottom of the ammonia water diluter; a cooling water inlet pipeline and a cooling water outlet pipeline are arranged on a shell pass of the first-stage cooling area, and a tube pass of the first-stage cooling area is a mixing area I; the shell side of the second-stage cooling area is connected with a boundary area liquid ammonia input pipeline, a flow regulating valve is arranged on the boundary area liquid ammonia input pipeline, the shell side of the second-stage cooling area is connected with an ammonia gas circulating pipeline, the ammonia gas circulating pipeline is communicated with the mixing tank, and the tube side of the second-stage cooling area is a second mixing area. According to the utility model, safe preparation of low-concentration ammonia water can be realized, and stable regulation of the concentration of the ammonia water is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonia chemical industry, and in particular relates to a safe treatment system for ammonia water configuration. Background Art

[0002] Liquid ammonia is an important chemical raw material with a wide range of uses. It is often used in the production of synthetic ammonia. At present, the process of mixing liquid ammonia with water in the industry to make ammonia water generally involves connecting the liquid ammonia pipe to the water pipe, injecting a large amount of liquid ammonia into the water pipe, and mixing the liquid ammonia and water in the pipe. Due to the poor mixing effect and unstable operation, the heat cannot be removed in time, forming a large amount of gaseous ammonia, making a lot of noise, and the temperature of the formed ammonia water is very high. A heat exchanger is needed to lower the temperature of the ammonia water. Once liquid ammonia forms gaseous ammonia, this part of ammonia is difficult to be absorbed by water, and spraying and other means are needed. In industry, this part of gaseous ammonia is generally absorbed by dilute acid, so the raw materials are wasted, and the concentration of the formed ammonia water is unstable. Traditional ammonia water preparation process equipment has many long processes and occupies a large area. Some pipelines are prone to vibration cracking due to large vibration, which poses a safety hazard and can cause ammonia leakage, leading to poisoning accidents of workers. Utility Model Content

[0003] The utility model provides an ammonia water configuration safety treatment system, which can realize the safe configuration of low-concentration ammonia water and ensure the stable configuration of the ammonia water concentration.

[0004] The technical solution of the utility model is:

[0005] An ammonia water safety treatment system is configured, including a mixing tank, an ammonia water diluter and a controller; the mixing tank is arranged on the top of the ammonia water diluter, and the mixing tank is connected to a desalted water inlet pipeline; the ammonia water diluter is provided with a primary cooling zone, a secondary mixing zone and a secondary cooling zone in sequence from top to bottom, an ammonia water discharge pipeline is provided at the bottom of the ammonia water diluter, the ammonia water discharge pipeline is provided with a discharge valve, the discharge valve is electrically connected to the controller, and the ammonia water discharge pipeline is connected to the ammonia water tank; a cooling water inlet pipeline and a cooling water outlet pipeline are provided in the shell side of the primary cooling zone, and the pipe side of the primary cooling zone is the first mixing zone; the shell side of the secondary cooling zone is connected to a boundary zone liquid ammonia input pipeline, a flow regulating valve is provided on the boundary zone liquid ammonia input pipeline, the flow regulating valve is electrically connected to the controller, the shell side of the secondary cooling zone is connected to an ammonia gas circulation pipeline, the ammonia gas circulation pipeline is connected to the mixing tank, and the pipe side of the secondary cooling zone is the second mixing zone.

[0006] Preferably, safety pipelines are respectively arranged at the top of the primary cooling zone and the secondary cooling zone, and the safety pipelines are connected to the flare system.

[0007] Preferably, an ammonia drain outlet is provided at the bottom of the secondary cooling zone.

[0008] Preferably, a liquid ammonia pump is provided on the boundary liquid ammonia input pipeline.

[0009] Preferably, a safety valve is provided on the safety pipeline, and the safety valve is electrically connected to the controller.

[0010] Preferably, the pressure of the liquid ammonia pump is 0.7-0.8 MPa, and the flow regulating valve controls the pressure to 0.25 MPa.

[0011] Preferably, a pressure regulating valve is provided on the ammonia circulation pipeline, the pressure regulating valve is electrically connected to the controller, and the pressure of the pressure regulating valve is 0.15 MPa.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The ammonia water configuration safety treatment system of the utility model can realize the safe configuration of low-concentration ammonia water and ensure the stable configuration of ammonia water concentration.

[0014] 2. The utility model utilizes the heat released by the reaction in the secondary cooling zone to heat the ammonia gas, thereby promoting the gasification of ammonia and making more rational use of energy. While achieving good effects, the production cost is reduced.

[0015] 3. Safety valves are installed at the top of the first-level cooling zone and the second-level cooling zone respectively. When the system is over-pressured, the safety valve will trip and release the gas to the flare system through the pipeline to ensure the safety of the system and realize the safe recovery of the released gas.

[0016] 4. An ammonia drain port is set on the bottom side of the secondary cooling zone for draining sewage when the system is shut down for short or long term maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] In the figure, 1, mixing tank; 2, ammonia diluter; 3, primary cooling zone; 301, cooling water inlet pipeline; 302, cooling water outlet pipeline; 303, mixing zone one; 4, secondary mixing zone; 5, secondary cooling zone; 501, boundary zone liquid ammonia input pipeline; 502, flow regulating valve; 503, ammonia circulation pipeline; 504, mixing zone two; 505, liquid ammonia pump; 506, pressure regulating valve; 6, safety pipeline; 601, safety valve; 7, flare system; 8, discharge pipeline; 9, ammonia tank; 10, desalted water inlet pipeline. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figure 1 As shown, this embodiment provides an ammonia water configuration safety treatment system, including a mixing tank 1, an ammonia water diluter 2 and a controller;

[0022] The mixing tank 1 is arranged on the top of the ammonia water diluter 2, and the mixing tank 1 is connected to a desalted water inlet pipeline 10;

[0023] The ammonia water diluter 2 is provided with a primary cooling zone 3, a secondary mixing zone 4 and a secondary cooling zone 5 in sequence from top to bottom. An ammonia water discharge pipeline 8 is provided at the bottom of the ammonia water diluter. The ammonia water discharge pipeline 8 is provided with a discharge valve. The discharge valve is electrically connected to the controller. The ammonia water discharge pipeline is connected to an ammonia water tank 9.

[0024] The shell side of the primary cooling zone 3 is provided with a cooling water inlet pipeline 301 and a cooling water outlet pipeline 302, and the tube side of the primary cooling zone 3 is a mixing zone 1 303;

[0025] The shell side of the secondary cooling zone 5 is connected to the boundary zone liquid ammonia input pipeline 501, and the boundary zone liquid ammonia input pipeline 501 is provided with a flow regulating valve 502 and a liquid ammonia pump 505. The flow regulating valve 502 is electrically connected to the controller. The pressure of the liquid ammonia pump 505 is 0.7MPa, and the flow regulating valve 502 controls the pressure to be 0.25MPa. The shell side of the secondary cooling zone 5 is connected to an ammonia circulation pipeline 503, and the ammonia circulation pipeline 503 is connected to the mixing tank 1. The pipe side of the secondary cooling zone 5 is the mixing zone 2 504. The ammonia circulation pipeline 503 is provided with a pressure regulating valve 506, and the pressure regulating valve 506 is electrically connected to the controller. The pressure of the pressure regulating valve 506 is 0.15MPa.

[0026] Safety pipelines 6 are respectively arranged at the top of the primary cooling zone 3 and the secondary cooling zone 5 , and the safety pipelines are connected to the flare system 7 . A safety valve 601 is arranged on the safety pipeline 6 , and the safety valve 601 is electrically connected to the controller.

[0027] An ammonia drain outlet is provided at the bottom of the secondary cooling zone 5 .

[0028] Working process:

[0029] The liquid ammonia from outside the bounded area is controlled at a pressure of 0.7MPa by a liquid ammonia pump and transported to the ammonia water configuration safety treatment system. After adjusting the flow control valve 502, the pressure is controlled at 0.25MPa and then enters the ammonia water diluter 2. The liquid ammonia enters the shell side of the secondary cooling zone 5, and after being gasified in the shell layer, it flows out from the ammonia circulation pipeline 503 at the upper part of the secondary cooling zone 5. The ammonia pressure is controlled to be 0.15MPa. The ammonia enters the mixing tank 1 at the top through the pipeline, and is mixed and diluted with the desalted water from the bounded area in the mixing tank 1. After mixing, it enters the primary cooling zone 3. The ammonia and the desalted water are mixed in the tube side of the primary cooling zone 3 to produce an exothermic reaction, and the shell side is passed into The cooling water is used to cool down the temperature and take away the heat released by the reaction of ammonia water; after the ammonia water reacts in the primary cooling section, it enters the secondary mixing section for full mixing, and then enters the secondary mixing zone 4, while providing heat for the shell-side liquid ammonia gasification. After the ammonia water in the tube side is cooled, it is configured into a dilute ammonia water with a concentration of 20%, flows out from the bottom of the liquid ammonia diluter, and enters the ammonia tank for storage; safety valves 601 are respectively arranged on the top of the primary cooling zone and the secondary cooling zone. When the system is over-pressured, the safety valve 601 will trip and discharge to the flare system 7 through the pipeline to ensure the safety of the system; an ammonia sewage outlet is arranged on the side of the bottom of the secondary cooling zone for sewage discharge when the system is shut down for short-term or long-term maintenance.

[0030] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. Ammonia water safety treatment system is provided, characterized in that: It comprises a mixing tank (1), an ammonia water diluter (2) and a controller; The mixing tank (1) is arranged on the top of the ammonia water diluter (2), and the mixing tank (1) is connected to a desalted water inlet pipeline (10); The ammonia water diluter (2) is provided with a primary cooling zone (3), a secondary mixing zone (4) and a secondary cooling zone (5) in order from top to bottom. An ammonia water discharge pipeline (8) is provided at the bottom of the ammonia water diluter (2). The ammonia water discharge pipeline (8) is provided with a discharge valve. The discharge valve is electrically connected to the controller. The ammonia water discharge pipeline (8) is connected to the ammonia water tank (9). The shell side of the primary cooling zone (3) is provided with a cooling water inlet pipeline (301) and a cooling water outlet pipeline (302), and the tube side of the primary cooling zone (3) is a mixing zone 1 (303); The shell side of the secondary cooling zone (5) is connected to the boundary zone liquid ammonia input pipeline (501), and a flow regulating valve (502) is provided on the boundary zone liquid ammonia input pipeline (501). The flow regulating valve (502) is electrically connected to the controller. The shell side of the secondary cooling zone (5) is connected to an ammonia circulation pipeline (503), and the ammonia circulation pipeline (503) is connected to the mixing tank (1). The pipe side of the secondary cooling zone (5) is the mixing zone 2 (504).

2. The ammonia solution safe treatment system according to claim 1, characterized in that: Safety pipelines (6) are respectively arranged at the top of the primary cooling zone (3) and the secondary cooling zone (5), and the safety pipelines (6) are connected to the flare system (7).

3. The ammonia solution safe treatment system according to claim 1, characterized in that: An ammonia discharge port is provided at the bottom of the secondary cooling zone (5).

4. The ammonia solution safe treatment system according to claim 1, characterized in that: A liquid ammonia pump (505) is provided on the boundary liquid ammonia input pipeline (501).

5. The ammonia solution safe treatment system according to claim 2, characterized in that: A safety valve (601) is provided on the safety pipeline (6), and the safety valve (601) is electrically connected to the controller.

6. The ammonia solution safe treatment system according to claim 4, characterized in that: The pressure of the liquid ammonia pump (505) is 0.7-0.8 MPa, and the flow control valve (502) controls the pressure to 0.25 MPa.

7. The ammonia water preparation safety treatment system according to claim 4, characterized in that: A pressure regulating valve (506) is provided on the ammonia circulation pipeline (503). The pressure regulating valve (506) is electrically connected to the controller. The pressure of the pressure regulating valve (506) is 0.15 MPa.

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