An ammonia unloading compressor closed replacement device

Abstract

This utility model discloses a closed-loop replacement device for an ammonia unloading compressor, including an ammonia unloading compressor. An ammonia discharge valve is connected to the top of the compressor. A nitrogen pipeline connected to the ammonia discharge valve is used for purging with nitrogen. An ammonia flare discharge pipeline connected to the ammonia discharge valve is used to transport gaseous ammonia and replacement nitrogen to the ammonia flare discharge system for combustion. This closed-loop replacement device for the ammonia unloading compressor, equipped with the ammonia discharge valve and flare discharge pipeline, allows for closed-loop replacement of the ammonia unloading compressor. First, the valve on the flare discharge pipeline is opened, and the valve on the nitrogen pipeline is closed. The gaseous ammonia inside the compressor is then discharged to the ammonia flare system through the ammonia discharge valve, achieving a closed and safe discharge of gaseous ammonia and replacement nitrogen. This ensures the closed-loop replacement of the ammonia unloading compressor, preventing gaseous ammonia from escaping into the environment, completely avoiding operator contact with gaseous ammonia, reducing the risk of poisoning, and ensuring operator safety.

Description

Technical Field

[0001] This utility model relates to the field of compressor closed-loop replacement technology, and in particular to a closed-loop replacement device for an ammonia unloading compressor. Background Technology

[0002] In chemical production, if an ammonia unloading compressor malfunctions or leaks, and the safety valve needs to be removed for calibration, a replacement operation must be performed via ammonia drainage. The traditional method is to directly discharge gaseous ammonia through a drainage valve into a temporary collection tank filled with water, allowing the water to absorb some of the gaseous ammonia.

[0003] However, this method has safety risks. When ammonia gas escapes into the environment, operators are easily exposed to toxic gases and are at risk of poisoning. When replacing with nitrogen, there is a risk of nitrogen asphyxiation. Therefore, a closed replacement device for ammonia unloading compressor is needed. Utility Model Content

[0004] The purpose of this invention is to provide a closed replacement device for an ammonia unloading compressor, which solves the safety risks existing in the prior art. When gaseous ammonia escapes into the environment, operators are easily exposed to toxic gases and are at risk of poisoning. When replacement is performed with nitrogen, there is a risk of nitrogen asphyxiation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a closed-loop replacement device for an ammonia unloading compressor, comprising an ammonia unloading compressor, an ammonia discharge drain valve connected to the top of the ammonia unloading compressor, a nitrogen pipeline connected to the ammonia discharge drain valve for purging with nitrogen, and an ammonia flare discharge pipeline connected to the ammonia discharge drain valve for transporting gaseous ammonia and replacement nitrogen to the ammonia flare system for combustion.

[0006] Preferably, the ammonia flare discharge pipeline is equipped with a discharge pipeline shut-off valve.

[0007] Preferably, the nitrogen pipeline is equipped with a second shut-off valve and a first shut-off valve.

[0008] Preferably, a check valve and a pressure relief drain valve are provided between the second shut-off valve and the first shut-off valve.

[0009] Preferably, a pipe blind flange is provided between the first shut-off valve and the check valve.

[0010] Preferably, the connection point of the nitrogen pipeline is located at the outlet end of the ammonia discharge drain valve.

[0011] Preferably, the diameter of the ammonia flare discharge pipe is the same as the diameter of the compressor exhaust port pipe, and the entire process is sealed by welding.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The closed replacement device for the ammonia unloading compressor is equipped with an ammonia discharge drain valve and a flare discharge pipeline. When the ammonia unloading compressor needs to be replaced, first open the valve on the flare discharge pipeline and close the valve on the nitrogen pipeline. The gaseous ammonia in the ammonia unloading compressor is discharged to the ammonia flare system through the ammonia discharge drain valve, realizing the closed and safe discharge of gaseous ammonia and replacement nitrogen. The closed replacement of the ammonia unloading compressor is achieved, and gaseous ammonia will not escape into the environment, completely avoiding the operator's contact with gaseous ammonia, reducing the risk of poisoning, and ensuring the safety of the operator. 2. The closed-loop replacement device for the ammonia unloading compressor is equipped with an ammonia flare system. Gaseous ammonia is discharged through the ammonia flare, which meets the emission requirements. This avoids the need to discharge gaseous ammonia through temporary pipes to temporary collection tanks containing water, reducing the workload of operators and the management costs of temporary collection tanks and ammonia liquid. Only additional pipes and valves are required, which is low-cost and compatible with existing equipment. It completely solves the safety and environmental problems caused by traditional open-loop replacement. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a closed replacement device for an ammonia unloading compressor proposed in this utility model; Figure 2 This is a side view of the closed replacement device for an ammonia unloading compressor proposed in this utility model. Figure 3 This is a schematic diagram of the overall planar structure of a closed replacement device for an ammonia unloading compressor proposed in this utility model.

[0014] In the diagram: 1. Ammonia unloading compressor; 2. Ammonia discharge drain valve; 3. Flare discharge pipeline; 4. Discharge pipeline shut-off valve; 5. Ammonia flare system; 6. Second shut-off valve; 7. Check valve; 8. First shut-off valve; 9. Pressure relief drain valve; 10. Pipeline blind flange; 11. Nitrogen pipeline; 12. Nitrogen system. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: As Figure 1 , Figure 2 and Figure 3As shown in the figure, a closed-loop replacement device for an ammonia unloading compressor includes an ammonia unloading compressor 1. An ammonia discharge drain valve 2 is connected to the top of the ammonia unloading compressor 1. A nitrogen pipeline 11 connected to the ammonia discharge drain valve 2 is used to introduce nitrogen for purging. An ammonia flare discharge pipeline 3 connected to the ammonia discharge drain valve 2 is used to transport gaseous ammonia and replacement nitrogen to the ammonia flare system 5 for combustion. When it is necessary to replace the ammonia unloading compressor 1, the valve on the flare discharge pipeline 3 is first opened, and the valve on the nitrogen pipeline 11 is closed. The gaseous ammonia in the ammonia unloading compressor 1 is discharged to the ammonia flare system 5 through the ammonia discharge drain valve 2, thereby achieving the closed-loop safe discharge of gaseous ammonia and replacement nitrogen and realizing the closed-loop replacement of the ammonia unloading compressor 1.

[0017] The ammonia flare discharge pipe 3 is equipped with a discharge pipe shut-off valve 4.

[0018] The nitrogen pipeline 11 is equipped with a second shut-off valve 6 and a first shut-off valve 8.

[0019] Example 2: Unlike Example 1, a one-way valve 7 and a pressure relief drain valve 9 are provided between the second shut-off valve 6 and the first shut-off valve 8.

[0020] A pipe blind flange 10 is installed between the first shut-off valve 8 and the one-way valve 7. A discharge pipe shut-off valve 4 is installed on the ammonia flare discharge pipe 3. A first shut-off valve 8, a second shut-off valve 6, and a one-way valve 7 are installed on the nitrogen pipe 11. A pressure relief drain valve 9 is installed between the first shut-off valve 8 and the second shut-off valve 6. A pipe blind flange 10 is installed between the first shut-off valve 8 and the one-way valve 7 to ensure that gaseous ammonia is preferentially discharged into the ammonia flare discharge system during replacement and that there is no risk of backflow during nitrogen purging. When replacement is not required, the pipe blind flange 10 is closed, and when replacement is required, it is opened.

[0021] Example 3: Unlike Example 1, the access point of nitrogen pipeline 11 is located at the outlet end of ammonia discharge drain valve 2. A pipeline is connected from the outlet of ammonia discharge drain valve 2 to the ammonia flare emission system to form a closed emission channel.

[0022] The diameter of the ammonia flare discharge pipe 3 is the same as that of the compressor exhaust port pipe, and the entire process is sealed by welding.

[0023] Working Principle: When the ammonia unloading compressor 1 needs to be replaced, first open the valve on the ammonia flare pipeline and close the valve on the nitrogen pipeline 11. The gaseous ammonia in the compressor 1 is then discharged to the ammonia flare system 5 through the ammonia discharge drain, achieving a closed and safe discharge of gaseous ammonia and replacement nitrogen. After the gaseous ammonia discharge is complete, close the valve on the ammonia flare pipeline and open the blind flange on the nitrogen pipeline 11 (before opening the blind flange, open the pressure relief drain between the nitrogen double valves to prevent residual pressure between pipelines). Open the first and second valves on the nitrogen pipeline 11, and charge nitrogen into the ammonia unloading compressor 1 through the nitrogen pipeline 11 via the ammonia discharge drain. Then close the valve on the nitrogen pipeline 11 and open the valve on the ammonia flare pipeline to depressurize to the ammonia flare discharge system. This process is repeated intermittently to replace the internal components. After replacement is complete, close the first and second valves on the nitrogen pipeline 11 and the valves on the ammonia flare pipeline, and close the blind flange 10 on the nitrogen pipeline 11. This operating procedure enables the closed-loop replacement of the ammonia unloading compressor 1, effectively preventing the escape of gaseous ammonia from causing harm to personnel and meeting environmental protection requirements.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A closed-loop replacement device for an ammonia unloading compressor, comprising an ammonia unloading compressor (1), characterized in that: The top of the ammonia unloading compressor (1) is connected to an ammonia discharge valve (2), and a nitrogen pipeline (11) connected to the ammonia discharge valve (2) is used to purge nitrogen. An ammonia flare discharge pipeline (3) connected to the ammonia discharge valve (2) is used to transport gaseous ammonia and replacement nitrogen to the ammonia flare system (5) for combustion.

2. The closed-loop replacement device for an ammonia unloading compressor according to claim 1, characterized in that: The ammonia flare discharge pipe (3) is equipped with a discharge pipe shut-off valve (4).

3. The closed-loop replacement device for an ammonia unloading compressor according to claim 1, characterized in that: The nitrogen pipeline (11) is equipped with a second shut-off valve (6) and a first shut-off valve (8).

4. The closed-loop replacement device for an ammonia unloading compressor according to claim 3, characterized in that: A check valve (7) and a pressure relief drain valve (9) are provided between the second shut-off valve (6) and the first shut-off valve (8).

5. The closed-loop replacement device for an ammonia unloading compressor according to claim 3, characterized in that: A pipe blind plate (10) is provided between the first shut-off valve (8) and the check valve (7).

6. The closed-loop replacement device for an ammonia unloading compressor according to claim 1, characterized in that: The connection point of the nitrogen pipeline (11) is located at the outlet end of the ammonia discharge drain valve (2).

7. The closed-loop replacement device for an ammonia unloading compressor according to claim 2, characterized in that: The diameter of the ammonia flare discharge pipe (3) is the same as that of the compressor exhaust port pipe, and the entire process is sealed by welding.

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