Dry gas sealing system of recycle hydrogen compressor

Abstract

The utility model discloses a dry gas sealing system of a recycle hydrogen compressor, and belongs to the technical field of dry gas sealing devices. Comprising a circulating hydrogen compressor, an efficient dehumidifier, a coalescence type filter element dehumidifier, a first booster pump, a second booster pump, a first main sealing gas pipeline, a second main sealing gas pipeline, a first nitrogen pipeline, a second nitrogen pipeline, an emptying header pipe, a main pipe, a first branch pipe, a second branch pipe and a third branch pipe. The efficient dehumidifier is arranged in front of the coalescence type filter element dehumidifier in a series connection mode, the pretreatment capacity of main sealing gas is improved, the heat tracing sleeve is arranged on the outer side of a main sealing gas pipeline, the problem that the main sealing gas carries liquid is solved, heat tracing condensate water is discharged on site, a booster pump is changed to be provided with an open booster pump and a standby booster pump, and purified air is additionally arranged on a power gas source. The main sealing gas cleanliness of the dry gas sealing system of the circulating hydrogen compressor is improved, the stability of the dry gas sealing system is improved, and long-period operation of the compressor is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry gas seal devices, and more specifically relates to a dry gas seal system for a recycle hydrogen compressor. Background Art

[0002] The recycle hydrogen compressor of the 300,000-ton / year naphthenic distillate oil hydrogenation unit in the hydrogenation workshop adopts a multi-stage high-pressure centrifugal compressor, and the shaft end seal of the compressor adopts a dry gas seal. The analysis of the existing technology believes that the reasons for the failure of the dry gas seal are generally divided into four categories: 1. The dry gas seal system is not cleaned in time, resulting in impurities entering and not being cleaned out in the first time, damaging the seal system; 2. The sealing ring is severely corroded and aged; 3. The rotational speed of the compressor fluctuates greatly, and the gas film stiffness is unstable; 4. The dry gas seal system is liquid-carrying.

[0003] Since the recycle hydrogen gas is recycled in the equipment in the reaction system and the wet desulfurization system (MDEA recycle desulfurization), and the recycle hydrogen is used as the main seal gas, a small amount of solid particles such as catalyst dust and MDEA droplets will be carried into the dry gas seal system, causing damage to the static and dynamic rings of the non-contact seal, and the excessive seal leakage will lead to the shutdown of the recycle hydrogen compressor and the shutdown of the unit for maintenance.

[0004] Therefore, how to develop a dry gas seal system for a recycle hydrogen compressor that solves the problem of dry gas seal damage caused by the entrainment of catalyst dust solid particles and fog-like droplets in the main seal gas is a technical problem that those skilled in the art urgently need to solve. Content of the Utility Model

[0005] In view of this, the utility model provides a dry gas seal system for a recycle hydrogen compressor.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] A dry gas seal system for a recycle hydrogen compressor includes a recycle hydrogen compressor, a high-efficiency dehumidifier, a coalescing filter dehumidifier, a booster pump I, a booster pump II, a main seal gas pipeline I, a main seal gas pipeline II, a nitrogen pipeline I, a nitrogen pipeline II, a vent main pipe, a main pipe, a branch pipe I, a branch pipe II, and a branch pipe III;

[0008] The above high-efficiency dehumidifier includes a primary dehumidification device and a secondary dehumidification device. The top of the primary dehumidification device is communicated with the bottom of the secondary dehumidification device. The primary dehumidification device is a cyclone liquid removal device, and both the secondary dehumidification device and the coalescing filter dehumidifier are high-precision coalescing filters;

[0009] The medium gas outlet of the above-mentioned circulating hydrogen compressor is connected to the main seal gas pipeline 1. The main seal gas pipeline 1 is connected to the seal gas inlet of the first-stage dehumidification device through a pipeline. The seal gas outlet of the second-stage dehumidification device is connected to the seal gas inlet of the coalescing filter element dehumidifier through a pipeline. The seal gas outlet of the coalescing filter element dehumidifier is connected to the main pipe. The main pipe is respectively connected to branch pipe 1, branch pipe 2 and branch pipe 3. Branch pipe 1 is connected to the seal gas inlet of booster pump 1. Branch pipe 2 is connected to the seal gas inlet of booster pump 2. Branch pipe 3 is connected to the main seal gas pipeline 2. The main seal gas pipeline 2 is connected to the seal inlet of the circulating hydrogen compressor. The seal gas outlets of the above-mentioned booster pump 1 and booster pump 2 are respectively connected to the main seal gas pipeline 2 through pipelines;

[0010] The above-mentioned nitrogen gas pipeline 1 is connected to the seal gas inlet of the first-stage dehumidification device. The above-mentioned nitrogen gas pipeline 2 is respectively connected to the power gas inlets of booster pump 1 and booster pump 2 through pipelines. A pneumatic ball valve is provided on the nitrogen gas pipeline 2;

[0011] The bottom drain outlets of the above-mentioned first-stage dehumidification device, the bottom drain outlet of the second-stage dehumidification device, the bottom drain outlet of the coalescing filter element dehumidifier and the leakage recovery outlet of booster pump 2 are respectively connected to the blowdown main pipe through pipelines. The leakage recovery outlet of booster pump 1 is connected to the blowdown main pipe;

[0012] A heat tracing sleeve 1 is provided outside the above-mentioned main seal gas pipeline 1. The heat tracing sleeve 1 is provided with a steam inlet 1 and a steam condensate outlet 1. Heat tracing sleeves 2 are provided outside the above-mentioned main pipe, branch pipe 3 and main seal gas pipeline 2. The heat tracing sleeve 2 is provided with a steam inlet 2 and a steam condensate outlet 2.

[0013] Further, the filtration accuracy of the above-mentioned high-precision coalescing filter element is 0.1μm.

[0014] Further, it also includes a purified air pipeline. The above-mentioned purified air pipeline is connected to the nitrogen gas pipeline 2.

[0015] Further, it also includes a differential pressure gauge and a pressure gauge. The above-mentioned differential pressure gauge is arranged on the pipeline connecting the seal gas inlet of the first-stage dehumidification device and the seal gas outlet of the second-stage dehumidification device. The above-mentioned pressure gauge is arranged on the pipeline connecting the seal gas outlet of the second-stage dehumidification device and the seal gas inlet of the coalescing filter element dehumidifier.

[0016] Further, it also includes a pressure remote transmission gauge 1 and a pressure remote transmission gauge 2. The above-mentioned pressure remote transmission gauge 1 is arranged on the blowdown main pipe connecting the leakage recovery port of booster pump 1. The above-mentioned pressure remote transmission gauge 2 is arranged on the pipeline connecting the leakage recovery outlet of booster pump 2 and the blowdown main pipe.

[0017] Advantages of the present utility model: An efficient dehumidifier is arranged in series before the coalescing filter element dehumidifier to improve the pretreatment ability of the main seal gas. By arranging a heat tracing sleeve outside the main seal gas pipeline, the problem of liquid carrying in the main seal gas is eliminated, and the heat tracing condensate is discharged outside the site. The booster pump is changed to one in use and one in standby, and a purified air is added to the power air source and other optimized operations are carried out to improve the cleanliness of the main seal gas of the dry gas seal system of the recycle hydrogen compressor, enhance the stability of the dry gas seal system, and ensure the long-term operation of the compressor. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the dry gas seal system of the recycle hydrogen compressor of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of the efficient dehumidifier of the present utility model;

[0020] Wherein, 1 - recycle hydrogen compressor, 2 - efficient dehumidifier, 3 - coalescing filter element dehumidifier, 4 - booster pump one, 5 - booster pump two, 6 - main seal gas pipeline one, 7 - main seal gas pipeline two, 8 - nitrogen gas pipeline one, 9 - nitrogen gas pipeline two, 10 - vent main pipe, 11 - main pipe, 12 - branch pipe one, 13 - branch pipe two, 14 - branch pipe three, 15 - heat tracing sleeve one, 16 - steam inlet one, 17 - steam condensate outlet one, 18 - heat tracing sleeve two, 19 - steam inlet two, 20 - steam condensate outlet two, 21 - purified air pipeline, 22 - differential pressure gauge, 23 - pressure gauge, 24 - pressure remote transmission gauge one, 25 - pressure remote transmission gauge two, 26 - primary dehumidification device, 27 - secondary dehumidification device, 28 - pneumatic ball valve. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] The dry gas seal system of the recycle hydrogen compressor 1 includes a recycle hydrogen compressor 1, an efficient dehumidifier 2, a coalescing filter element dehumidifier 3, a booster pump one 4, a booster pump two 5, a main seal gas pipeline one 6, a main seal gas pipeline two 7, a nitrogen gas pipeline one 8, a nitrogen gas pipeline two 9, a vent main pipe 10, a main pipe 11, a branch pipe one 12, a branch pipe two 13 and a branch pipe three 14;

[0023] The high-efficiency dehumidifier 2 includes a primary dehumidification device 26 and a secondary dehumidification device 27. The top of the primary dehumidification device 26 is connected to the bottom of the secondary dehumidification device 27. The primary dehumidification device 26 is a cyclone liquid removal device, and both the secondary dehumidification device 27 and the coalescing filter dehumidifier 3 are equipped with high-precision coalescing filters;

[0024] The medium gas outlet of the recycle hydrogen compressor 1 is connected to the primary main seal gas pipeline 6. The primary main seal gas pipeline 6 is connected to the seal gas inlet of the primary dehumidification device 26 through a pipeline. The seal gas outlet of the secondary dehumidification device 27 is connected to the seal gas inlet of the coalescing filter dehumidifier 3 through a pipeline. The seal gas outlet of the coalescing filter dehumidifier 3 is connected to the main pipe 11. The main pipe 11 is respectively connected to the first branch pipe 12, the second branch pipe 13, and the third branch pipe 14. The first branch pipe 12 is connected to the seal gas inlet of the first booster pump 4. The second branch pipe 13 is connected to the seal gas inlet of the second booster pump 5. The third branch pipe 14 is connected to the secondary main seal gas pipeline 7. The secondary main seal gas pipeline 7 is connected to the seal inlet of the recycle hydrogen compressor 1. The seal gas outlets of the first booster pump 4 and the second booster pump 5 are respectively connected to the secondary main seal gas pipeline 7 through pipelines;

[0025] The first nitrogen gas pipeline 8 is connected to the seal gas inlet of the primary dehumidification device 26. The second nitrogen gas pipeline 9 is respectively connected to the power gas inlets of the first booster pump 4 and the second booster pump 5 through pipelines. A pneumatic ball valve 28 is provided on the second nitrogen gas pipeline 9;

[0026] The bottom drain outlets of the primary dehumidification device 26, the bottom drain outlet of the secondary dehumidification device 27, the bottom drain outlet of the coalescing filter dehumidifier 3, and the leakage recovery outlet of the second booster pump 5 are respectively connected to the vent main pipe 10 through pipelines. The leakage recovery outlet of the first booster pump 4 is connected to the vent main pipe 10;

[0027] A first heat tracing sleeve 15 is provided outside the primary main seal gas pipeline 6. The first heat tracing sleeve 15 is provided with a first steam inlet 16 and a first steam condensate outlet 17. A second heat tracing sleeve 18 is provided outside the main pipe 11, the third branch pipe 14, and the secondary main seal gas pipeline 7. The second heat tracing sleeve 18 is provided with a second steam inlet 19 and a second steam condensate outlet 20.

[0028] In one embodiment, the filtration accuracy of the high-precision coalescing filter is 0.1 μm.

[0029] In one embodiment, a purified air pipeline 21 is further included, and the purified air pipeline 21 is connected to the second nitrogen gas pipeline 9.

[0030] In one embodiment, a differential pressure gauge 22 and a pressure gauge 23 are further included. The differential pressure gauge 22 is disposed on the pipeline connecting the sealed gas inlet of the primary dehumidifying device 26 and the sealed gas outlet of the secondary dehumidifying device 27, and the pressure gauge 23 is disposed on the pipeline connecting the sealed gas outlet of the secondary dehumidifying device 27 and the sealed gas inlet of the coalescing filter dehumidifier 3. When the differential pressure increases, the filter element is replaced, and after completion, it is put into use again.

[0031] In one embodiment, a first remote pressure transmitter 24 and a second remote pressure transmitter 25 are further included. The first remote pressure transmitter 24 is disposed on the vent main pipe 10 connecting the air leakage recovery port of the first booster pump 4, and the second remote pressure transmitter 25 is disposed on the pipeline connecting the air leakage recovery outlet of the second booster pump 5 and the vent main pipe 10.

[0032] Process flow:

[0033] In the normal mode (when the recycle hydrogen compressor 1 is in normal production state): The medium gas coming out of the recycle hydrogen compressor 1 enters the primary dehumidifying device 26 in the high-efficiency dehumidifier 2 as the main seal gas to remove large droplets and solid particles, and then enters the secondary dehumidifying device 27 to remove aerosols and fine droplets in the form of fog. After being discharged from the high-efficiency dehumidifier 2, it enters the coalescing filter dehumidifier 3 to remove aerosols and fine droplets in the form of fog again. After being discharged from the coalescing filter dehumidifier 3, it enters the main pipe 11, flows through the third branch pipe 14 and the second main seal gas pipeline 7, and the seal gas continues to enter the connection of the seal inlet of the recycle hydrogen compressor 1.

[0034] In the abnormal mode (when the recycle hydrogen compressor 1 is in the startup or shutdown state): Nitrogen enters the high-efficiency dehumidifier 2 as the main seal gas through the first nitrogen pipeline 8. After being discharged from the high-efficiency dehumidifier 2, it enters the coalescing filter dehumidifier 3. After being discharged from the coalescing filter dehumidifier 3, it enters the main pipe 11, flows through the third branch pipe 14 and the second main seal gas pipeline 7, and the nitrogen continues to enter the connection of the seal inlet of the recycle hydrogen compressor 1. Nitrogen enters the power gas inlets of the first booster pump 4 and the second booster pump 5 respectively through the second nitrogen pipeline 9 and is used as the gas source for the two booster pumps.

[0035] An efficient dehumidifier 2 is arranged in series before the coalescing filter element dehumidifier 3 to improve the pretreatment capacity of the main seal gas. By arranging a first heat tracing sleeve 15 outside the first main seal gas pipeline 6, and arranging a second heat tracing sleeve 18 outside the main pipe 11, the third branch pipe 14 and the second main seal gas pipeline 7, the problem of liquid entrainment in the main seal gas is eliminated, and the heat tracing condensate is discharged outside the site. The temperature of the main seal gas is controlled above 90 °C. When the booster pump fails, there is no standby, and the dry gas seal system cannot be put into use normally. When the pressure of the power source nitrogen gas < 0.4 MPa, the booster pump cannot be started. To solve the above problems, the booster pump is changed to one open and one standby, and a purified air source is added to the power source nitrogen gas and other optimization operations. When the nitrogen gas pressure ≥ 0.4 MPa, the nitrogen gas source of the booster pump is opened, and the purified air source is closed. When the nitrogen gas pressure < 0.4 MPa, the purified air source of the booster pump is opened, and the nitrogen gas source is closed. The cleanliness of the main seal gas of the dry gas seal system of the recycle hydrogen compressor 1 is improved, the stability of the dry gas seal system is enhanced, and the long-term operation of the compressor is ensured.

[0036] The description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dry gas seal system for a recycle hydrogen compressor, characterized in that, It includes a recycle hydrogen compressor, an efficient dehumidifier, a coalescing filter dehumidifier, a booster pump I, a booster pump II, a main seal gas pipeline I, a main seal gas pipeline II, a nitrogen pipeline I, a nitrogen pipeline II, a vent main pipe, a main pipe, a branch pipe I, a branch pipe II, and a branch pipe III; The efficient dehumidifier includes a primary dehumidification device and a secondary dehumidification device. The top of the primary dehumidification device is connected to the bottom of the secondary dehumidification device. The primary dehumidification device is a cyclone liquid removal device, and both the secondary dehumidification device and the coalescing filter dehumidifier are equipped with high-precision coalescing filters; The medium gas outlet of the recycle hydrogen compressor is connected to the main seal gas pipeline I. The main seal gas pipeline I is connected to the seal gas inlet of the primary dehumidification device through a pipeline. The seal gas outlet of the secondary dehumidification device is connected to the seal gas inlet of the coalescing filter dehumidifier through a pipeline. The seal gas outlet of the coalescing filter dehumidifier is connected to the main pipe. The main pipe is respectively connected to the branch pipe I, the branch pipe II, and the branch pipe III. The branch pipe I is connected to the seal gas inlet of the booster pump I. The branch pipe II is connected to the seal gas inlet of the booster pump II. The branch pipe III is connected to the main seal gas pipeline II. The main seal gas pipeline II is connected to the seal inlet of the recycle hydrogen compressor. The seal gas outlets of the booster pump I and the booster pump II are respectively connected to the main seal gas pipeline II through pipelines; The nitrogen pipeline I is connected to the seal gas inlet of the primary dehumidification device. The nitrogen pipeline II is respectively connected to the power gas inlets of the booster pump I and the booster pump II through pipelines, and a pneumatic ball valve is provided on the nitrogen pipeline II; The bottom drain outlets of the primary dehumidification device, the bottom drain outlet of the secondary dehumidification device, the bottom drain outlet of the coalescing filter dehumidifier, and the leakage recovery outlet of the booster pump II are respectively connected to the vent main pipe through pipelines. The leakage recovery outlet of the booster pump I is connected to the vent main pipe; A heat tracing sleeve I is provided outside the main seal gas pipeline I, and the heat tracing sleeve I is provided with a steam inlet I and a steam condensate outlet I. Heat tracing sleeves II are provided outside the main pipe, the branch pipe III, and the main seal gas pipeline II, and the heat tracing sleeves II are provided with a steam inlet II and a steam condensate outlet II.

2. The dry gas seal system of a recycle hydrogen compressor according to claim 1, characterized in that, The filtration accuracy of the high-precision coalescing filter is 0.1 μm.

3. The dry gas seal system of a recycle hydrogen compressor according to claim 1, wherein It also includes a purified air pipeline, and the purified air pipeline is connected to the nitrogen pipeline II.

4. The dry gas seal system of a recycle hydrogen compressor according to claim 1, characterized in that, It also includes a differential pressure gauge and a pressure gauge. The differential pressure gauge is arranged on the pipeline connecting the seal gas inlet of the primary dehumidification device and the seal gas outlet of the secondary dehumidification device. The pressure gauge is arranged on the pipeline connecting the seal gas outlet of the secondary dehumidification device and the seal gas inlet of the coalescing filter dehumidifier.

5. The dry gas seal system of a recycle hydrogen compressor according to claim 1, characterized in that It also includes a pressure remote transmission gauge I and a pressure remote transmission gauge II. The pressure remote transmission gauge I is arranged on the vent main pipe connecting the leakage recovery port of the booster pump I. The pressure remote transmission gauge II is arranged on the pipeline connecting the leakage recovery outlet of the booster pump II and the vent main pipe.

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