Device for reducing hydrogen content at top of liquid ammonia spherical tank

Abstract

A device for reducing the content of hydrogen on the top of a liquid ammonia spherical tank comprises the liquid ammonia spherical tank used for use and a support arranged at the bottom end of the liquid ammonia spherical tank, and further comprises a connecting pipe, a three-way pipe and an ammonia compressor of an ammonia synthesis device, the top end of the liquid ammonia spherical tank is connected with the connecting pipe, and one end of the connecting pipe is provided with the three-way pipe; one joint of the three-way pipe is connected with a blow-down pipe, the blow-down pipe is provided with a second control valve, the other joint of the three-way pipe is connected with a conveying pipe, the conveying pipe is provided with a third control valve, one end of the conveying pipe is provided with an ammonia gas compressor, and a pipeline on one side of the ammonia gas compressor is provided with a pressure gauge. After the gas phase at the top of the liquid ammonia spherical tank is absorbed and compressed, the liquid ammonia gas phase in the spherical tank can be recycled, ammonia gas waste caused by torch discharge is reduced, meanwhile, a large amount of hydrogen cannot be gathered at the top of the liquid ammonia spherical tank, the safety risk during loading is reduced, and good economic and safety benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen treatment on the tank top, and specifically relates to a device for reducing the hydrogen content on the tank top of a liquid ammonia spherical tank. Background Technique

[0002] The chemical product liquid ammonia is produced with hydrogen and nitrogen as raw materials under the conditions of high temperature, high pressure and catalyst. More or less, a small amount of hydrogen will be contained in the produced finished product, and then it will be temporarily stored in the liquid ammonia spherical tank. As the material continuously enters and exits the spherical tank, the hydrogen content in the gas phase on the tank top gradually increases. As the hydrogen content gradually increases, there are certain safety hazards in the liquid ammonia spherical tank. To ensure the safe and stable operation of the spherical tank, the following several methods will be used for treatment. One is to treat the gas phase of the liquid ammonia spherical tank by discharging it to the flare through the gas phase on the tank top, but this method will cause a large amount of waste of ammonia. The other is to add an ammonia recovery device to recover the gaseous ammonia at the top of the spherical tank and discharge the hydrogen to the flare, which is rather wasteful. Content of the Utility Model

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a device for reducing the hydrogen content on the tank top of a liquid ammonia spherical tank, and effectively solves the problems mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: The utility model includes a liquid ammonia spherical tank for use and a bracket arranged at the bottom end of the liquid ammonia spherical tank, and also includes a connecting pipe, a three-way pipe, a first control valve, a vent pipe, an ammonia gas going to the flare stack, a second control valve, a conveying pipe, a third control valve, an ammonia gas compressor, a fourth control valve, a pressure gauge, a gas supply pressure regulating valve and an ammonia compressor of a synthetic ammonia plant. The top end of the liquid ammonia spherical tank is connected with a connecting pipe, one end of the connecting pipe is installed with a three-way pipe, one through part of the three-way pipe is connected with a vent pipe, and a second control valve is installed on the vent pipe. The other through part of the three-way pipe is connected with a conveying pipe, and a third control valve is installed on the conveying pipe. One end of the conveying pipe is installed with an ammonia gas compressor, and a pressure gauge is installed on the pipeline on one side of the ammonia gas compressor.

[0005] Preferably, a first control valve is installed on the connecting pipe.

[0006] Preferably, one end of the vent pipe is connected to the ammonia gas going to the flare stack.

[0007] Preferably, a fourth control valve is installed at a position close to the ammonia gas compressor on the conveying pipe.

[0008] Preferably, a gas supply pressure regulating valve is installed on the pipeline on one side of the pressure gauge.

[0009] Preferably, one side of the gas supply pressure regulating valve is connected with the ammonia compressor of the synthetic ammonia plant through a pipeline.

[0010] Beneficial effects: When the present utility model is in use, a tee is connected to the connecting pipe at the top of the liquid ammonia spherical tank, and after the tee is connected to the third control valve, a pipeline is laid along the pipe gallery and connected to the inlet of the ammonia compressor; the outlet pipeline of the ammonia compressor is connected to the inlet of the ammonia compressor supply pipeline of the synthetic ammonia plant. Samples are regularly taken from the top of the liquid ammonia spherical tank to analyze the hydrogen content therein. When the hydrogen content at the top of the liquid ammonia spherical tank reaches a certain value, the valve opening is controlled by the first control valve at the top of the tank, and the ammonia compressor is started on-site. The gaseous material in the liquid ammonia spherical tank will be pressurized and transported to the inlet of the ammonia compressor of the synthetic ammonia plant, and mixed with the ammonia produced by the synthetic ammonia plant and enter the ammonia compressor for subsequent processes. The regulating valve can also be fixed at a certain opening, and continuous transportation can be achieved by controlling the rotation speed of the ammonia compressor. The structure of the present utility model is novel and ingenious. After absorbing and compressing the gas phase at the top of the liquid ammonia spherical tank, the gaseous phase of the liquid ammonia in the spherical tank can be recovered, reducing the waste of ammonia caused by the discharge torch. At the same time, a large amount of hydrogen will not accumulate at the top of the liquid ammonia spherical tank, reducing the safety risk during loading, and having good economic and safety benefits. Brief Description of the Drawings

[0011] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0012] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0013] Reference numerals in the figure: 1, liquid ammonia spherical tank; 2, support; 3, connecting pipe; 4, tee; 5, first control valve; 6, vent pipe; 7, ammonia to flare; 8, second control valve; 9, conveying pipe; 10, third control valve; 11, ammonia compressor; 12, fourth control valve; 13, pressure gauge; 14, supply pressure regulating valve; 15, ammonia compressor of synthetic ammonia plant. Detailed Description of the Specific Embodiment

[0014] The following further elaborates in detail on the specific embodiment of the present utility model in conjunction with the attached Figure 1 drawings.

[0015] Example 1, consisting of Figure 1Provided hereby, the present utility model provides a device for reducing the hydrogen content in the top of a liquid ammonia spherical tank, which includes a liquid ammonia spherical tank 1 for use and a bracket 2 arranged at the bottom end of the liquid ammonia spherical tank 1. It further includes a connecting pipe 3, a three-way pipe 4, a first control valve 5, a vent pipe 6, an ammonia gas flare stack 7, a second control valve 8, a conveying pipe 9, a third control valve 10, an ammonia compressor 11, a fourth control valve 12, a pressure gauge 13, a supply air pressure regulating valve 14 and an ammonia compressor 15 of a synthetic ammonia plant. The top end of the liquid ammonia spherical tank 1 is connected with the connecting pipe 3. One end of the connecting pipe 3 is installed with a three-way pipe 4. One connection of the three-way pipe 4 is connected with the vent pipe 6, and the vent pipe 6 is installed with a second control valve 8. The other connection of the three-way pipe 4 is connected with the conveying pipe 9, and the conveying pipe 9 is installed with a third control valve 10. One end of the conveying pipe 9 is installed with an ammonia compressor 11, and a pressure gauge 13 is installed on the pipeline on one side of the ammonia compressor 11.

[0016] A first control valve 5 is installed on the connecting pipe 3 to facilitate the control of the connecting pipe 3.

[0017] One end of the vent pipe 6 is connected to the ammonia gas flare stack 7 to facilitate the use.

[0018] A fourth control valve 12 is installed at the position of the conveying pipe 9 close to the ammonia compressor 11 to facilitate the control.

[0019] A supply air pressure regulating valve 14 is installed on the pipeline on one side of the pressure gauge 13 to facilitate the control.

[0020] One side of the supply air pressure regulating valve 14 is connected with the ammonia compressor 15 of the synthetic ammonia plant through a pipeline to facilitate the recycling use.

[0021] Working principle: When the present utility model is in use, it is connected from the connecting pipe 3 at the top of the liquid ammonia spherical tank 1 to the three-way pipe 4, and the three-way pipe 4 is connected to the inlet of the ammonia compressor 11 after passing through the third control valve 10 and laying the pipeline along the pipe gallery; the outlet pipeline of the ammonia compressor 11 is connected to the inlet of the supply pipeline of the ammonia compressor 15 of the synthetic ammonia plant. Regularly take samples from the top of the liquid ammonia spherical tank 1 to analyze the hydrogen content therein. When the hydrogen content at the top of the liquid ammonia spherical tank 1 reaches a certain value, control the valve opening through the first control valve 5 at the top of the tank, and start the ammonia compressor 11 on site. The gaseous phase material of the liquid ammonia spherical tank 1 will be pressurized and transported to the inlet of the ammonia compressor 15 of the synthetic ammonia plant, and mixed with the ammonia produced by the synthetic ammonia plant and enter the ammonia compressor for subsequent processes. It is also possible to fix the regulating valve at a certain opening and continuously transport by controlling the rotation speed of the ammonia compressor 11.

[0022] Beneficial effects: The structure of the present utility model is novel and ingeniously conceived. After absorbing and compressing the gaseous phase at the top of the liquid ammonia spherical tank 1, the gaseous phase of the liquid ammonia in the spherical tank can be recycled, reducing the waste of ammonia gas caused by the discharge flare stack. At the same time, there will be no large amount of hydrogen accumulation at the top of the liquid ammonia spherical tank 1, reducing the safety risk during loading, and having good economic and safety benefits.

[0023] Those skilled in the art shall connect all the electrical components in this case to their adapted power supplies through wires, and appropriate controllers and encoders should be selected according to the actual situation to meet the control requirements. For the specific connection and control sequence, reference should be made to the working sequence among the electrical components in the following working principle to complete the electrical connection. The detailed connection means are well-known techniques in this field. The following mainly introduces the working principle and process, and no further description of the electrical control will be given.

[0024] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An apparatus for reducing the hydrogen content in the top of a liquid ammonia spherical tank, comprising a liquid ammonia spherical tank (1) for use and a bracket (2) arranged at the bottom end of the liquid ammonia spherical tank (1), characterized in that: It also includes a connecting pipe (3), a tee (4), a first control valve (5), a vent pipe (6), an ammonia gas flare (7), a second control valve (8), a delivery pipe (9), a third control valve (10), an ammonia compressor (11), a fourth control valve (12), a pressure gauge (13), a supply pressure regulating valve (14) and an ammonia compressor of an ammonia synthesis unit (15). The top of the liquid ammonia spherical tank (1) is connected with a connecting pipe (3). One end of the connecting pipe (3) is equipped with a tee (4). One branch of the tee (4) is connected with a vent pipe (6). A second control valve (8) is installed on the vent pipe (6). Another branch of the tee (4) is connected with a delivery pipe (9). A third control valve (10) is installed on the delivery pipe (9). One end of the delivery pipe (9) is equipped with an ammonia compressor (11). A pressure gauge (13) is installed on the pipeline on one side of the ammonia compressor (11).

2. The device for reducing the hydrogen content at the top of the liquid ammonia spherical tank according to claim 1, wherein: A first control valve (5) is installed on the connecting pipe (3).

3. The device for reducing the hydrogen content in the top of the liquid ammonia spherical tank according to claim 1, characterized in that: One end of the vent pipe (6) is connected to the ammonia gas flare (7).

4. The device for reducing the hydrogen content at the top of the liquid ammonia spherical tank according to claim 1, wherein: A fourth control valve (12) is installed at a position of the delivery pipe (9) close to the ammonia compressor (11).

5. The device for reducing the hydrogen content at the top of a liquid ammonia spherical tank according to claim 1, wherein: A supply pressure regulating valve (14) is installed on the pipeline on one side of the pressure gauge (13).

6. The device for reducing the hydrogen content in the top of the liquid ammonia spherical tank according to claim 5, characterized in that: One side of the supply pressure regulating valve (14) is connected with the ammonia compressor of the ammonia synthesis unit (15) through a pipeline.

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