A high-pressure ammonia separator ammonia releasing device for ammonia synthesis

Abstract

The utility model provides a kind of ammonia synthesis with high-pressure ammonia separator ammonia release device, belong to ammonia synthesis technical field.The device includes high-pressure ammonia separator, medium-pressure ammonia separator, low-pressure ammonia separator and ammonia ball tank.High-pressure ammonia separator is connected with medium-pressure ammonia separator by pipeline, medium-pressure ammonia separator is connected with low-pressure ammonia separator by pipeline, and the exhaust end of medium-pressure ammonia separator is connected with compressor, and low-pressure ammonia separator is connected with ammonia ball tank by pipeline;Cut-off valve and ammonia release valve group are sequentially provided on the pipeline between high-pressure ammonia separator and medium-pressure ammonia separator, and ammonia release valve group is provided with two groups in parallel;Liquid level meter is provided in high-pressure ammonia separator, and the signal output end of liquid level meter is connected with controller by wire, and cut-off valve and ammonia release valve group are electrically connected with controller.The utility model specifically provides a kind of ammonia synthesis with high-pressure ammonia separator ammonia release device, which can realize automatic adjustment ammonia release, eliminate high-pressure string low-pressure security risk, and can adjust ammonia release passage according to liquid level condition.

Description

Technical Field

[0001] This utility model belongs to the field of ammonia synthesis technology, specifically referring to a high-pressure ammonia separator ammonia release device for ammonia synthesis. Background Technology

[0002] Ammonia is an important chemical raw material with a wide range of applications: in agriculture, it is mainly used to produce various nitrogen-containing chemical fertilizers and compound fertilizers such as urea, ammonium nitrate, and ammonium sulfate; in inorganic chemistry, it can be used to prepare ammonia water, liquid ammonia, nitric acid, ammonium salts, soda ash, etc.; in organic chemistry, it is widely used in the production of synthetic fibers, plastics, dyes, and urea (in organic synthesis).

[0003] In the ammonia synthesis process, the high-pressure ammonia separator is the core separation equipment, capable of separating over 95% of liquid ammonia, which is then transported to ammonia spherical tanks for storage. Currently, liquid ammonia is mainly discharged from the high-pressure ammonia separator using an automatic regulating valve. However, because the pressure of the ammonia-containing synthesis gas inside the high-pressure ammonia separator is much higher than that inside the medium-pressure ammonia separator, when a single automatic regulating valve malfunctions, such as jamming and inability to close, or valve packing leakage, it is difficult to quickly and manually shut off the discharge path. This can easily lead to direct liquid ammonia leakage, or even serious accidents such as high-pressure gas entering the low-pressure system, posing a significant safety hazard to production. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of this utility model is to provide an ammonia release device for a high-pressure ammonia separator used in ammonia synthesis, so as to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model is as follows: This utility model proposes a high-pressure ammonia separator for ammonia synthesis, comprising a high-pressure ammonia separator, a medium-pressure ammonia separator, a low-pressure ammonia separator, and an ammonia spherical tank. The bottom liquid outlet of the high-pressure ammonia separator is connected to the medium-pressure ammonia separator through a pipeline, the bottom liquid outlet of the medium-pressure ammonia separator is connected to the low-pressure ammonia separator through a pipeline, the exhaust end of the medium-pressure ammonia separator is connected to a compressor, and the bottom liquid outlet of the low-pressure ammonia separator is connected to the ammonia spherical tank through a pipeline. The pipeline between the high-pressure ammonia separator and the medium-pressure ammonia separator is sequentially equipped with a shut-off valve and an ammonia release valve group, and two groups of the ammonia release valve group are connected in parallel. The high-pressure ammonia separator is equipped with a level gauge, and the signal output terminal of the level gauge is connected to a controller via a wire. The shut-off valve and the ammonia release valve assembly are both electrically connected to the controller.

[0006] Furthermore, the ammonia release valve assembly includes an electromagnetic shut-off valve, a manual valve, and a pneumatic regulating valve.

[0007] Furthermore, the high-pressure ammonia separator includes a shell-and-tube heat exchanger located at the top and a separator located at the bottom, the heat exchanger being connected to the compressor via pipelines.

[0008] Furthermore, a flow meter and a control valve are provided between the medium-pressure ammonia separator and the low-pressure ammonia separator.

[0009] Furthermore, the storage pressure of the medium-pressure ammonia separator is less than 4 MPa.

[0010] The technical solution provided by this utility model has the following beneficial effects: By coordinating the controller, level gauge, shut-off valve, and two sets of parallel ammonia release valves, automatic regulation of ammonia release is achieved. The two sets of parallel ammonia release valves, one in operation and one on standby, automatically switch in case of an emergency (valve failure, valve packing leakage, etc.). This eliminates the need to rely on the operator's experience to judge ammonia release, thus preventing the hidden danger of high pressure passing through low pressure. It also prevents accidents such as liquid ammonia leakage and high pressure gas passing through low pressure. Furthermore, in case of abnormal liquid level, the automatic adjustment of the electromagnetic shut-off valve shortens the adjustment time, providing a strong guarantee for the safe and stable operation of the system. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an ammonia release device for ammonia synthesis using a high-pressure ammonia separator, as proposed in an embodiment of this utility model.

[0012] Among them, 1. High-pressure ammonia separator, 2. Shut-off valve, 3. Electromagnetic shut-off valve, 4. Manual valve, 5. Pneumatic regulating valve, 6. Medium-pressure ammonia separator, 7. Low-pressure ammonia separator, 8. Compressor, and 9. Ammonia spherical tank.

[0013] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0014] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0015] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0016] See Figure 1 In this embodiment, the present invention provides a high-pressure ammonia separator for ammonia synthesis, including a high-pressure ammonia separator 1, a medium-pressure ammonia separator 6, a low-pressure ammonia separator 7, and an ammonia spherical tank 9. The bottom outlet of the high-pressure ammonia separator 1 is connected to the medium-pressure ammonia separator 6 through a pipeline, and the bottom outlet of the medium-pressure ammonia separator 6 is connected to the low-pressure ammonia separator 7 through a pipeline. The exhaust end of the medium-pressure ammonia separator 6 is connected to a compressor 8. The flash vapor in the medium-pressure ammonia separator 6 is sent to the inlet of the compressor 8 for recovery to prevent ammonia from being released into the air. The bottom outlet of the low-pressure ammonia separator 7 is connected to the ammonia spherical tank 9 through a pipeline. A shut-off valve 2 and an ammonia release valve group are sequentially installed on the pipeline between the high-pressure ammonia separator 1 and the medium-pressure ammonia separator 6, and two sets of ammonia release valve groups are connected in parallel. The high-pressure ammonia separator 1 is equipped with a level gauge. The signal output terminal of the level gauge is connected to a controller via a wire. The shut-off valve 2 and the two sets of parallel ammonia release valves are all electrically connected to the controller.

[0017] In this embodiment, since a medium-pressure ammonia separator 6 is provided between the high-pressure ammonia separator 1 and the low-pressure ammonia separator 7, the high pressure in the high-pressure ammonia separator 1 is prevented from directly entering the low-pressure ammonia separator 7, thus protecting the low-pressure ammonia separator 7.

[0018] In use, the liquid ammonia separated from the bottom of the high-pressure ammonia separator 1 is transported to the low-pressure ammonia separator 7 via the medium-pressure ammonia separator 6, and then further separated and transported to the ammonia spherical tank 9 for storage. The upper part of the high-pressure ammonia separator 1 contains high-pressure gas, and the lower part contains liquid ammonia. (1) When the liquid ammonia level in the high-pressure ammonia separator 1 is lower than the set value, the level gauge sends a signal to the controller, and the controller controls the shut-off valve 2 to close to cut off the pipeline, so as to prevent high-pressure gas from entering the medium-pressure ammonia separator 6. (2) When the liquid ammonia level is higher than the set value, the controller controls the shut-off valve 2 to open and controls the two ammonia discharge valve groups to discharge the liquid ammonia in the high-pressure ammonia separator 1 into the medium-pressure ammonia separator 6.

[0019] Because two parallel ammonia release valve groups are installed, the two groups of ammonia release valve groups automatically adjust the ammonia release path according to the liquid level in the high-pressure ammonia separator 1: (1) When the liquid level in the high-pressure ammonia separator 1 is higher than the set value, a signal is input to the controller. The controller controls one of the ammonia release valve groups to open and the other to close by default, so that the two ammonia release valve groups can be used in a standby manner. (2) If the currently used ammonia release valve group has a slight abnormality (such as abnormal pressure fluctuation or pipeline leakage signal), the leaking ammonia release valve group can be immediately closed by the controller and switched to the standby ammonia release valve group to maintain the continuity of delivery; (3) If the level gauge detects a sudden rise in the liquid ammonia level in the high-pressure ammonia separator 1 and the flow rate of the single ammonia release valve group is insufficient, the controller will increase the number of ammonia release valve groups opened to quickly reduce the liquid level.

[0020] Specifically, as a specific embodiment, in this embodiment, the ammonia release valve group includes an electromagnetic shut-off valve 3, a manual valve 4, and a pneumatic regulating valve 5. The electromagnetic shut-off valve 3 controls the opening and closing of the ammonia release valve group. By using an electromagnetic shut-off valve 3 in each ammonia release valve group, the leakage source can be quickly and remotely cut off when a leak occurs in the currently operating ammonia release valve group, and another ammonia release valve group can be put into operation, ensuring both safety and stable normal operation of the system. The pneumatic regulating valve 5 regulates the pressure of liquid ammonia entering the medium-pressure ammonia separator 6. The manual valve 4 serves as a manual backup control component, forming multiple safety guarantees in conjunction with the electromagnetic shut-off valve 3 and the pneumatic regulating valve 5.

[0021] In the initial state, both the manual valve 4 and the pneumatic regulating valve 5 of the two sets of ammonia release valves are in the open state. The open pneumatic regulating valve 5 regulates the pressure of liquid ammonia entering the medium-pressure ammonia separator 6.

[0022] The controller controls the flow status of the two sets of ammonia release valves by controlling the opening and closing of the electromagnetic shut-off valves 3 of the two sets of ammonia release valves. When the controller controls the electromagnetic shut-off valve 3 of a certain set of ammonia release valves to open, that set of ammonia release valves forms a flow path with the high-pressure ammonia separator 1 and the low-pressure ammonia separator 7; when the controller controls the electromagnetic shut-off valve 3 of a certain set of ammonia release valves to close, that set of ammonia release valves is in standby mode.

[0023] Specifically, as a specific embodiment, in this embodiment, the high-pressure ammonia separator 1 includes a shell-and-tube heat exchanger disposed at the top and a separator disposed at the bottom, and the heat exchanger is connected to the compressor 8 through a pipeline.

[0024] In operation, the -14℃ synthesis gas from the ammonia cooler first enters the high-pressure ammonia separator 1, and flows through the separator below to complete gas-liquid separation: liquid ammonia remains at the bottom of the separator, while the ammonia-containing synthesis gas (circulating gas) flows upward; the rising circulating gas enters the shell-and-tube heat exchanger above, where heat exchange (such as cooling or temperature regulation) is performed on the shell side of the heat exchanger to meet the requirements of subsequent processes; the circulating gas after being processed by the heat exchanger is discharged from the top of the high-pressure ammonia separator 1, sent to the compressor 8 for pressurization, and then returned to the system to continue participating in the synthesis reaction, forming a cycle.

[0025] Specifically, as a concrete embodiment, in this embodiment, a flow meter and a control valve are provided between the medium-pressure ammonia separator 6 and the low-pressure ammonia separator 7. The storage pressure of the medium-pressure ammonia separator 6 is less than 4 MPa.

[0026] In use, the liquid ammonia separated by the high-pressure ammonia separator 1 is depressurized to below 4MPa through the ammonia release valve group and sent to the medium-pressure ammonia separator 6 at -7℃. The flash vapor of the medium-pressure ammonia separator 6 is sent to the inlet of the compressor 8 through the control valve, and the liquid ammonia is sent to the low-pressure ammonia separator 7 through the flow meter and control valve.

[0027] The above scheme enables automatic adjustment, improving work efficiency. Throughout the entire operation, operators do not need to manually release ammonia, which not only saves manpower and improves equipment automation, but also allows for the central control operation to open the backup ammonia release valve group and close the emergency group electromagnetic shut-off valve 3 when one valve leaks. This ensures the normal operation of the system and avoids safety accidents caused by untimely or excessive ammonia release, thus improving production safety.

[0028] 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.

[0029] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. An ammonia release device for a high-pressure ammonia separator used in ammonia synthesis, characterized in that, The system includes a high-pressure ammonia separator (1), a medium-pressure ammonia separator (6), a low-pressure ammonia separator (7), and an ammonia spherical tank (9). The bottom outlet of the high-pressure ammonia separator (1) is connected to the medium-pressure ammonia separator (6) via a pipeline. The bottom outlet of the medium-pressure ammonia separator (6) is connected to the low-pressure ammonia separator (7) via a pipeline. The exhaust end of the medium-pressure ammonia separator (6) is connected to a compressor (8). The bottom outlet of the low-pressure ammonia separator (7) is connected to the ammonia spherical tank (9) via a pipeline. A shut-off valve (2) and an ammonia release valve group are sequentially installed on the pipeline between the high-pressure ammonia separator (1) and the medium-pressure ammonia separator (6), and two groups of the ammonia release valve group are connected in parallel. The high-pressure ammonia separator (1) is equipped with a level gauge. The signal output terminal of the level gauge is connected to a controller via a wire. The shut-off valve (2) and the ammonia release valve group are both electrically connected to the controller.

2. The ammonia release device for a high-pressure ammonia separator used in ammonia synthesis according to claim 1, characterized in that: The ammonia release valve assembly includes an electromagnetic shut-off valve (3), a manual valve (4), and a pneumatic regulating valve (5).

3. The ammonia release device for a high-pressure ammonia separator used in ammonia synthesis according to claim 1, characterized in that: The high-pressure ammonia separator (1) includes a shell-and-tube heat exchanger located at the top and a separator located at the bottom. The heat exchanger is connected to the compressor (8) via a pipeline.

4. The ammonia release device for a high-pressure ammonia separator used in ammonia synthesis according to claim 1, characterized in that: A flow meter and a control valve are provided between the medium-pressure ammonia separator (6) and the low-pressure ammonia separator (7).

5. The ammonia release device for a high-pressure ammonia separator used in ammonia synthesis according to claim 1, characterized in that: The storage pressure of the medium-pressure ammonia separator (6) is less than 4 MPa.

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