CN218971476U - Leakage gas recovery device of nitrogen centrifugal compressor for hydrogen liquefaction - Google Patents
Leakage gas recovery device of nitrogen centrifugal compressor for hydrogen liquefaction Download PDFInfo
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- CN218971476U CN218971476U CN202223343690.XU CN202223343690U CN218971476U CN 218971476 U CN218971476 U CN 218971476U CN 202223343690 U CN202223343690 U CN 202223343690U CN 218971476 U CN218971476 U CN 218971476U
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Abstract
The utility model discloses a leaked gas recovery device of a nitrogen centrifugal compressor for hydrogen liquefaction, which comprises a gas seal and an oil seal which are arranged in compression units of each stage of the nitrogen centrifugal compressor, wherein a sealing ring is arranged between a volute and a bearing box of each stage of compression unit, the gas seal, the oil seal, a transmission shaft, the volute, the bearing box and the sealing ring in each stage of compression unit enclose an air collecting cavity, an air outlet is arranged on the outer peripheral surface of the gas seal in each stage of compression unit, an annular gas recovery groove is arranged on the inner peripheral surface of the gas seal, which is far away from an impeller, of each stage of compression unit, a recovery air hole is arranged on the end surface of the gas seal, which is far away from the impeller, of each stage of compression unit, the air outlet of each stage of compression unit is communicated with an inlet of an adsorption tank through an ejector, the adsorption tank is communicated with an oil mist filter, and the oil mist filter is communicated with the inlet of the first stage of compression unit of the nitrogen centrifugal compressor. The utility model has the advantage of low use cost for enterprises.
Description
Technical Field
The utility model relates to the technical field of nitrogen centrifugal compressors for hydrogen liquefaction, in particular to a leakage gas recovery device of a nitrogen centrifugal compressor for hydrogen liquefaction.
Background
At present, for the nitrogen centrifugal compressor in the hydrogen liquefaction system, a large amount of sealing gas (nitrogen) leaks to the atmosphere from a gap between the volute and the bearing box in the working process, and the sealing gas of the nitrogen centrifugal compressor is in closed circulation and can be only supplemented by a liquid nitrogen vehicle at fixed time, so that the use cost of enterprises is greatly increased.
Disclosure of Invention
The utility model aims to provide a leakage gas recovery device of a nitrogen centrifugal compressor for hydrogen liquefaction, which can reduce the use cost of enterprises.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a nitrogen gas centrifugal compressor leakage gas recovery unit for hydrogen liquefaction, including setting up in the compression unit at each stage of nitrogen gas centrifugal compressor be used for sealing the gas seal that corresponds the clearance between transmission shaft and the spiral case in the compression unit, and be used for sealing the oil blanket that corresponds the clearance between transmission shaft and the bearing box in the compression unit, be provided with the sealing washer that is used for sealing the clearance between the two between spiral case and the bearing box at each stage of compression unit, gas seal in each stage compression unit, the oil blanket, the transmission shaft, spiral case, bearing box and sealing washer enclose jointly into the gas collecting chamber that is isolated with the atmosphere, be provided with the gas outlet on the gas seal outer peripheral surface in each stage compression unit, be provided with the annular recovery gas groove that is linked together with the gas outlet on the gas seal inner peripheral surface that keeps away from the impeller side in each stage compression unit, be provided with the recovery gas vent that will correspond the gas collecting chamber and be linked together with the gas outlet in the gas seal face that keeps away from the impeller side in each stage compression unit, the gas outlet of each stage compression unit is linked together the entry of adsorption tank through the ejector, the export intercommunication adsorption tank of adsorption tank, the export of oil mist filter is linked together the entry of the first stage compression unit of nitrogen gas centrifugal compressor through the recovery pipeline that has the relief valve.
Further, the foregoing apparatus for recovering a leakage gas from a nitrogen centrifugal compressor for liquefying hydrogen, wherein: the nitrogen centrifugal compressor is provided with a three-stage compression unit, and the specific connection mode that the three-stage compression unit is communicated with the inlet of the adsorption tank comprises the following steps: the air outlet of the third-stage compression unit is connected with one inlet of the first ejector through a first pipeline, the air outlet of the second-stage compression unit is connected with the other inlet of the first ejector through a second pipeline, the outlet of the first ejector is connected with one inlet of the second ejector through a third pipeline, the air outlet of the first-stage compression unit is connected with the other inlet of the second ejector through a fourth pipeline, and the outlet of the second ejector is connected with the inlet of the adsorption tank through a fifth pipeline with a first valve.
Further, the foregoing apparatus for recovering a leakage gas from a nitrogen centrifugal compressor for liquefying hydrogen, wherein: the concrete structure that annular recovery gas groove and gas outlet are linked together includes: the annular recovery cavity is arranged in the air seal, the annular recovery air groove is communicated with the annular recovery cavity through a first air passage arranged in the air seal, and the annular recovery cavity is communicated with the air outlet through a second air passage arranged in the air seal; the concrete structure that recovery gas pocket is linked together with the gas outlet includes: the recovery air hole is communicated with the second air passage through a third air passage arranged in the air seal, so that the recovery air hole is communicated with the air outlet.
Further, the foregoing apparatus for recovering a leakage gas from a nitrogen centrifugal compressor for liquefying hydrogen, wherein: be provided with the differential pressure gauge on the adsorption tank, be provided with first manometer at the top of adsorption tank, be provided with the second manometer on retrieving the pipeline.
Further, the foregoing apparatus for recovering a leakage gas from a nitrogen centrifugal compressor for liquefying hydrogen, wherein: the bottom of the adsorption tank is provided with a first discharge port, the first discharge port is provided with a second valve, the bottom of the oil mist filter is provided with a second discharge port, and the second discharge port is provided with a third valve.
Through implementation of the technical scheme, the utility model has the beneficial effects that: the sealing gas can be effectively recycled, and the recycled sealing gas can not cause oil pollution to the compression working medium of the nitrogen centrifugal compressor, so that the use safety is high, and the use cost of enterprises is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a leakage gas recovery device of a nitrogen centrifugal compressor for hydrogen liquefaction.
Fig. 2 is a schematic structural view of a compression unit of the nitrogen centrifugal compressor.
Fig. 3 is an enlarged schematic view of the H site shown in fig. 2.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent.
As shown in fig. 1, 2 and 3, the present embodiment is a nitrogen centrifugal compressor with three stages of compression units, and details the structure of a leakage gas recovery device of a nitrogen centrifugal compressor for liquefying hydrogen, where the leakage gas recovery device of a nitrogen centrifugal compressor for liquefying hydrogen includes an air seal 3 disposed in each stage of compression units of the nitrogen centrifugal compressor and used for sealing a gap between a transmission shaft 1 and a volute 2 in the corresponding compression units, and an oil seal 5 used for sealing a gap between the transmission shaft 1 and the bearing housing 4 in the corresponding compression units, a seal ring 30 used for sealing a gap between the volute 2 and the bearing housing 4 in each stage of compression units is disposed between the volute 2 and the bearing housing 4 in the corresponding compression units, the air seal 3, the oil seal 5, the transmission shaft 1, the volute 2, the bearing housing 4 and the seal ring 30 in each stage of compression units together enclose a gas collecting chamber 6 isolated from the atmosphere, an air outlet 7 is disposed on an outer peripheral surface of the air seal 3 in each stage of compression units, an annular gas groove 8 communicated with the air outlet 7 is disposed on an inner peripheral surface of the air seal 3 far from an impeller side in each stage of compression units, and the specific structure of the annular groove 8 is communicated with the air outlet 7 includes: the annular recovery chamber 31 is arranged in the air seal 3, the annular recovery air groove 8 is communicated with the annular recovery chamber 31 through a first air passage 32 arranged in the air seal 3, and the annular recovery chamber 31 is communicated with the air outlet 7 through a second air passage 33 arranged in the air seal 3; the end face of the air seal 3, far away from the impeller side, in each stage of compression unit is provided with a recovery air hole 9 which communicates the corresponding air collection chamber 6 with the air outlet 7, and in this embodiment, the specific structure of the recovery air hole 9 communicating with the air outlet 7 comprises: the recovery air hole 9 is communicated with the second air passage 33 through a third air passage 34 arranged in the air seal 3, so that the recovery air hole 9 is communicated with the air outlet 7; the air outlet 7 of the third-stage compression unit 10 is connected with one inlet of the first ejector 12 through a first pipeline 11, the air outlet 7 of the second-stage compression unit 13 is connected with the other inlet of the first ejector 12 through a second pipeline 14, the outlet of the first ejector 12 is connected with one inlet of the second ejector 16 through a third pipeline 15, the air outlet 7 of the first-stage compression unit 17 is connected with the other inlet of the second ejector 16 through a fourth pipeline 18, the outlet of the second ejector 16 is connected with the inlet of the adsorption tank 21 through a fifth pipeline 20 with a first valve 19, a differential pressure gauge 22 is arranged on the adsorption tank 21, a first pressure gauge 23 is arranged at the top of the adsorption tank 21, a first discharge port is arranged at the bottom of the adsorption tank 21, and a second valve 24 is arranged at the first discharge port; the outlet of the adsorption tank 21 is communicated with the inlet of the oil mist filter 26 through a sixth pipeline 25, a second discharge port is arranged at the bottom of the oil mist filter 26, a third valve 35 is arranged at the second discharge port, and the outlet of the oil mist filter 26 is communicated with the inlet of the first-stage compression unit 17 of the nitrogen centrifugal compressor through a recovery pipeline 29 with a second pressure gauge 27 and a pressure reducing valve 28;
when the nitrogen centrifugal compressor operates, when sealing gas (nitrogen) of each compression unit of the nitrogen centrifugal compressor leaks along the direction away from the impeller between the air seal 3 and the transmission shaft 1, most of the leaked sealing gas is sequentially output through the annular recovery gas groove 8, the first gas channel 32, the annular recovery chamber 31 and the second gas channel 33 and then through the gas outlet 7, and a small part of the leaked sealing gas is continuously leaked along the direction away from the impeller between the air seal 3 and the transmission shaft 1 to the gas collection chamber 6, and because the gas collection chamber 6 is a closed chamber, the leaked gas entering the gas collection chamber 6 is sequentially output through the recovery gas hole 9, the third gas channel 34 and the second gas channel 33 and then also from the gas outlet 7;
the sealing gas output from the gas outlet 7 of the third-stage compression unit 10 of the nitrogen centrifugal compressor enters the first ejector 12 through the first pipeline 11, meanwhile, the sealing gas output from the gas outlet 7 of the second-stage compression unit 13 also enters the first ejector 12 through the second pipeline 14, the first ejector 12 ejects the collected sealing gas into the second ejector 16 through the third pipeline 15, meanwhile, the sealing gas output from the gas outlet 7 of the first-stage compression unit 17 also enters the second ejector 16 through the fourth pipeline 18, the second ejector 16 ejects the collected sealing gas into the adsorption tank 21 through the fifth pipeline and the first valve 19, the adsorption tank 21 performs oil mist adsorption filtration on the sealing gas, then enters the oil mist filter 26 through the sixth pipeline 25, the oil mist filter 26 performs fine filtration on the sealing gas, and then outputs the sealing gas to the recovery pipeline 29, and the sealing gas returns to the inlet of the first-stage compression unit 17 of the nitrogen centrifugal compressor after being regulated to the inlet pressure through the pressure reducing valve 28 on the recovery pipeline 29.
The utility model has the advantages that: the sealing gas can be effectively recycled, and the recycled sealing gas can not cause oil pollution to the compression working medium of the nitrogen centrifugal compressor, so that the use safety is high, and the use cost of enterprises is reduced.
The above description is only of the preferred embodiment of the present utility model, and is not intended to limit the present utility model in any other way, but any modifications or equivalent variations according to the technical spirit of the present utility model are still included in the scope of the present utility model.
Claims (5)
1. The utility model provides a nitrogen gas centrifugal compressor leakage gas recovery unit for hydrogen liquefaction, includes the air seal that is arranged in the compression unit at each stage of nitrogen gas centrifugal compressor and is used for sealing the clearance between transmission shaft and the spiral case in the corresponding compression unit, and is used for sealing the oil blanket that is arranged in the clearance between transmission shaft and the bearing box in the corresponding compression unit, its characterized in that: a sealing ring for sealing a gap between the spiral casing and the bearing box is arranged between each stage of compression unit, an air seal, an oil seal, a transmission shaft, the spiral casing, the bearing box and the sealing ring in each stage of compression unit are jointly enclosed into an air collecting cavity isolated from the atmosphere, an air outlet is arranged on the outer circumferential surface of the air seal in each stage of compression unit, an annular recovery air groove communicated with the air outlet is arranged on the inner circumferential surface of the air seal, far away from the impeller, of each stage of compression unit, a recovery air hole communicated with the corresponding air collecting cavity and the air outlet is arranged on the air sealing end surface, far away from the impeller, of each stage of compression unit, the air outlet of each stage of compression unit is communicated with an inlet of an adsorption tank through an ejector, an outlet of the adsorption tank is communicated with an inlet of an oil mist filter, and an outlet of the oil mist filter is communicated with an inlet of a first stage of compression unit of a nitrogen centrifugal compressor through a recovery pipeline with a pressure reducing valve.
2. The leakage gas recovery device of a nitrogen centrifugal compressor for liquefying hydrogen according to claim 1, wherein: the nitrogen centrifugal compressor is provided with a three-stage compression unit, and the specific connection mode that the three-stage compression unit is communicated with the inlet of the adsorption tank comprises the following steps: the air outlet of the third-stage compression unit is connected with one inlet of the first ejector through a first pipeline, the air outlet of the second-stage compression unit is connected with the other inlet of the first ejector through a second pipeline, the outlet of the first ejector is connected with one inlet of the second ejector through a third pipeline, the air outlet of the first-stage compression unit is connected with the other inlet of the second ejector through a fourth pipeline, and the outlet of the second ejector is connected with the inlet of the adsorption tank through a fifth pipeline with a first valve.
3. The leakage gas recovery device of a nitrogen centrifugal compressor for liquefying hydrogen according to claim 1, wherein: the concrete structure that annular recovery gas groove and gas outlet are linked together includes: the annular recovery cavity is arranged in the air seal, the annular recovery air groove is communicated with the annular recovery cavity through a first air passage arranged in the air seal, and the annular recovery cavity is communicated with the air outlet through a second air passage arranged in the air seal; the concrete structure that recovery gas pocket is linked together with the gas outlet includes: the recovery air hole is communicated with the second air passage through a third air passage arranged in the air seal, so that the recovery air hole is communicated with the air outlet.
4. A nitrogen centrifugal compressor leakage gas recovery apparatus for liquefying hydrogen according to claim 1, 2 or 3, characterized in that: be provided with the differential pressure gauge on the adsorption tank, be provided with first manometer at the top of adsorption tank, be provided with the second manometer on retrieving the pipeline.
5. The leakage gas recovery device of a nitrogen centrifugal compressor for liquefying hydrogen according to claim 4, wherein: the bottom of the adsorption tank is provided with a first discharge port, the first discharge port is provided with a second valve, the bottom of the oil mist filter is provided with a second discharge port, and the second discharge port is provided with a third valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223343690.XU CN218971476U (en) | 2022-12-14 | 2022-12-14 | Leakage gas recovery device of nitrogen centrifugal compressor for hydrogen liquefaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223343690.XU CN218971476U (en) | 2022-12-14 | 2022-12-14 | Leakage gas recovery device of nitrogen centrifugal compressor for hydrogen liquefaction |
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| Publication Number | Publication Date |
|---|---|
| CN218971476U true CN218971476U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223343690.XU Active CN218971476U (en) | 2022-12-14 | 2022-12-14 | Leakage gas recovery device of nitrogen centrifugal compressor for hydrogen liquefaction |
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|---|---|
| CN (1) | CN218971476U (en) |
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2022
- 2022-12-14 CN CN202223343690.XU patent/CN218971476U/en active Active
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