CN113028276A - Low-temperature gas recovery device - Google Patents
Low-temperature gas recovery device Download PDFInfo
- Publication number
- CN113028276A CN113028276A CN202110208109.4A CN202110208109A CN113028276A CN 113028276 A CN113028276 A CN 113028276A CN 202110208109 A CN202110208109 A CN 202110208109A CN 113028276 A CN113028276 A CN 113028276A
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- Prior art keywords
- gas
- low
- pressure
- ejector
- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/046—Enhancing energy recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a low-temperature gas recovery device, which belongs to the technical field of gas filling and comprises a storage tank, a low-temperature pump and an ejector, wherein the bottom of the storage tank is communicated with the low-temperature pump through a liquid phase conveying pipe, the low-temperature pump is communicated with the top of the storage tank through a gas circulating pipe, the low-temperature pump is communicated with the ejector through a high-pressure gas conveying pipe, the output end of the ejector is connected with a gas conveying pipe and communicated with a high-pressure vaporizer, and the ejector is also communicated with the top of the storage tank through a gas. When the low-pressure low-temperature liquid in the fixed storage tank is pressurized by the low-temperature liquid pump and the corresponding flow output is maintained, the low-pressure low-temperature liquid directly enters the high-pressure vaporizer from the past and enters the ejector, the high-pressure low-temperature liquid passes through the ejector to form the siphon chamber, then the low-temperature gas in the storage tank is directly input into the siphon chamber and enters the high-pressure vaporizer together with the high-pressure liquid to be vaporized and reheated and then is filled into the steel cylinder, the gas discharge and waste are avoided, and the economic benefit of a factory is effectively improved.
Description
Technical Field
The invention relates to the technical field of gas filling, in particular to a low-temperature gas recovery device.
Background
The existing industrial high-pressure gas filling gas cylinder basically adopts a low-temperature liquid vaporization filling process, and the process flow is as follows: cryogenic liquid (such as liquid oxygen, liquid nitrogen, liquid argon and liquefied natural gas) is transported to a gas filling site by a special cryogenic tank car and is filled into a fixed cryogenic storage tank for storage. The cryogenic liquid is input into a high-pressure cryogenic pump through the pressure of the storage tank (generally below 0.8MPa) to be pressurized to 15.0MPa or even higher. The pressurized low-temperature liquid enters a vaporizer to be vaporized, the reheating temperature is close to the ambient temperature, and then the low-temperature liquid is filled into a steel cylinder.
The filling time of the steel cylinder is usually centralized and discontinuous, but the low-temperature liquid in the fixed storage tank is evaporated at any time. The pressure will gradually rise over time. In addition, each pre-cooling and operation of the cryogenic pump also vaporizes a portion of the cryogenic liquid, either by venting or recycling back to the sump, which also accelerates the rate at which the sump pressure naturally rises. When the pressure rises to the maximum operating pressure of the sump, the sump is either vented artificially for safety or a safety valve on the sump is automatically vented. The discharge of these gases involves both safety and environmental concerns, as well as economic losses.
The gas (cryogenic gas) vaporized and vaporized by the cryogenic storage tank and the cryogenic pump cannot enter the cryogenic pump for compression (the cryogenic pump cannot compress the gas), and most enterprises can only discharge the gas. And a small number of enterprises adopt a diaphragm compressor to pressurize and then charge the steel cylinder. The diaphragm compressor has the factors of high price, low efficiency, troublesome maintenance, environmental pollution (oil lubrication), land occupation and the like. Enterprises generally fill a plurality of media, and if each medium is provided with a set of diaphragm press filling system, the investment is not small. And the annual electric charge and maintenance charge are not small, which causes huge economic loss.
Disclosure of Invention
The invention aims to provide a low-temperature gas recovery device which has the advantages of reducing gas emission, recycling gas, reducing waste and improving economic benefit.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a cryogenic gas recovery unit, includes storage tank and cryopump, passes through liquid phase conveyer pipe intercommunication between the bottom of storage tank and cryopump, and the top of cryopump and storage tank passes through gas circulating pipe intercommunication, still includes the sprayer, pass through high-pressure gas conveyer pipe intercommunication between cryopump and sprayer, the gas output end of sprayer is connected with the gas delivery pipe and is used for carrying high-pressure gas to the steel bottle through high-pressure vaporizer with high-pressure vaporizer intercommunication, the sprayer still passes through the top intercommunication of gaseous phase conveyer pipe and storage tank.
Preferably, still be provided with pressure sensor, temperature sensor and trip valve on the gaseous phase conveyer pipe, pressure sensor, temperature sensor and trip valve all pass through wire and controller electric signal connection.
Preferably, the shut-off valve is arranged on the gas phase conveying pipe between the pressure sensor and the temperature sensor.
Preferably, the gas phase delivery pipe is further provided with a check valve for allowing only the gas phase to flow from the sump to the ejector.
Preferably, the check valve is arranged on the gas phase conveying pipe between the stop valve and the temperature sensor.
Preferably, a balancer is provided in communication with the high-pressure gas delivery pipe between the cryopump and the ejector.
Preferably, the high-pressure gas delivery pipe between the cryopump and the ejector is further provided with a check valve for allowing only the high-pressure gas to move in the direction of the ejector.
Preferably, the liquid phase conveying pipe, the gas phase conveying pipe and the circulating pipe are provided with valves.
Compared with the prior art, the invention has the advantages that:
firstly, the treatment of gas generated at a low-temperature pump when a steel cylinder is filled with gas at a high frequency is effectively carried out;
gas generated at the low-temperature pump is recycled, enters the storage tank for temporary storage, is recycled under the siphoning action of the ejector, is introduced into the high-pressure vaporizer and is filled into the steel cylinder, so that the gas emission is avoided, the environmental pollution is avoided, the pressure in the storage tank can be kept within a safe range without emission, the waste is reduced, and the overall economic benefit is improved;
the device simple structure, the device can install additional on current low temperature high pressure fills the dress system, also can equip in high pressure fills the dress system as a standard unit machine in the equipment system of new installation, great reduction the degree of difficulty and the economic consumption of mill's repacking.
Drawings
FIG. 1 is a schematic view of the structure of this embodiment;
Detailed Description
The present invention will be further explained below.
Example (b):
as shown in FIG. 1, a cryogenic gas recovery apparatus comprises a storage tank, a cryogenic pump and an ejector, wherein the bottom of the storage tank is communicated with the cryogenic pump through a liquid phase delivery pipe, and the cryogenic pump is communicated with the top of the storage tank through a gas circulation pipe. After a part of low-temperature liquid is vaporized in precooling and running of the low-temperature pump, the gas is circulated into the storage tank by the gas circulating pipe for temporary storage.
The cryogenic pump is communicated with the ejector through a high-pressure gas conveying pipe, the gas output end of the ejector is communicated with the high-pressure vaporizer through a gas conveying pipe, and the high-pressure vaporizer conveys high-pressure gas to the steel cylinder to fill the steel cylinder. In order to reduce waste by allowing the gas temporarily stored in the storage tank to be filled into the cylinder, the injector is also communicated with the top of the storage tank through a gas phase delivery pipe. During operation, low-pressure (generally less than 0.8MPa) low-temperature liquid in the storage tank is pressurized by the low-temperature liquid pump, and corresponding flow output is maintained to enter the ejector. The liquid entering the ejector forms a siphon chamber in the ejector due to the higher flow speed, then the low-temperature gas in the storage tank is directly input into the siphon chamber and vaporized and reheated by the high-pressure vaporizer together with the high-pressure liquid and then is filled into the steel cylinder, so that the aim of recycling the gas temporarily stored in the storage tank is fulfilled, the gas is not required to be discharged additionally, the waste is effectively reduced, the pressure in the storage tank is reduced, and the aim of safety and environmental protection is fulfilled. In order to prevent the gas in the ejector from flowing back to the cryopump, a check valve for moving the high-pressure gas only in the direction of the ejector is further provided in the high-pressure gas transfer pipe between the cryopump and the ejector.
In order to monitor the whole process of the gas to the ejector, a pressure sensor, a temperature sensor and a stop valve are also arranged on the gas phase conveying pipe. The pressure sensor, the temperature sensor and the cut-off valve are all in electric signal connection with the controller through leads. The conditions of the temperature of the gas in the gas phase conveying pipe, the pressure in the pipe and the like can be clearly known through a control panel of the controller. So as to prevent the normal operation of the cryopump from being influenced by the over-low pressure of the storage tank caused by excessive gas phase pumping from the storage tank. And simultaneously, the detection prevents the high-pressure liquid from being reversely connected back to the low-temperature storage tank. Wherein the trip valve is located between storage tank gaseous phase export and the sprayer import, and when storage tank pressure was crossed low or high-pressure liquid is anti-to-cluster, the signal that pressure sensor and temperature sensor gathered can in time close the quick action emergency valve through control instrument.
Meanwhile, a one-way valve is arranged on the gas-phase conveying pipe between the gas-phase outlet of the storage tank and the inlet of the ejector so as to prevent the gas in the ejector from flowing back into the storage tank and make multiple protection. In the application, the check valve is specifically arranged on the gas phase conveying pipe between the stop valve and the temperature sensor, the check valve rate automatically blocks the backflow of gas firstly, then the stop valve is closed, the pressure in the gas phase conveying pipe between the check valve and the stop valve is basically kept to be the pressure when the gas backflow does not occur, and the check valve only reflows against high-pressure liquid.
A balancer is communicated with the high-pressure gas delivery pipe between the cryogenic pump and the ejector so as to eliminate pulses generated when the cryogenic pump works.
Valves are arranged on the liquid phase conveying pipe, the gas phase conveying pipe and the circulating pipe, and after filling is stopped, all the valves are closed, so that gas is prevented from leaving the storage tank.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; while the invention has been described in terms of specific embodiments and applications, it will be apparent to those skilled in the art that variations may be applied to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A low-temperature gas recovery device comprises a storage tank and a low-temperature pump, wherein the bottom of the storage tank is communicated with the low-temperature pump through a liquid phase delivery pipe, the low-temperature pump is communicated with the top of the storage tank through a gas circulation pipe,
the low-temperature pump is communicated with the ejector through a high-pressure gas conveying pipe, a gas output end of the ejector is connected with a gas conveying pipe and used for being communicated with a high-pressure vaporizer to convey high-pressure gas into a steel cylinder through the high-pressure vaporizer, and the ejector is further communicated with the top of the storage tank through a gas-phase conveying pipe.
2. The cryogenic gas recovery device according to claim 1, wherein the gas phase conveying pipe is further provided with a pressure sensor, a temperature sensor and a shut-off valve, and the pressure sensor, the temperature sensor and the shut-off valve are all in electrical signal connection with the controller through leads.
3. A cryogenic gas recovery device according to claim 2, wherein the shut-off valve is provided on the gas phase transfer pipe between the pressure sensor and the temperature sensor.
4. A cryogenic gas recovery device according to claim 3, wherein the vapour phase transfer line is further provided with a one-way valve for allowing vapour phase to pass from the sump to the ejector only.
5. A cryogenic gas recovery device according to claim 4, wherein the one-way valve is provided on the gas phase transfer line between the shut-off valve and the temperature sensor.
6. A cryogenic gas recovery device according to claim 1, wherein a balancer is provided in communication with the high pressure gas feed line between the cryogenic pump and the ejector.
7. A cryogenic gas recovery device according to claim 1, wherein the high-pressure gas feed pipe between the cryogenic pump and the ejector is further provided with a check valve for moving only the high-pressure gas in the direction of the ejector.
8. A cryogenic gas recovery device according to claim 1 wherein the liquid phase transfer pipe, the gas phase transfer pipe and the circulation pipe are each provided with a valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110208109.4A CN113028276A (en) | 2021-02-24 | 2021-02-24 | Low-temperature gas recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110208109.4A CN113028276A (en) | 2021-02-24 | 2021-02-24 | Low-temperature gas recovery device |
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| Publication Number | Publication Date |
|---|---|
| CN113028276A true CN113028276A (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110208109.4A Pending CN113028276A (en) | 2021-02-24 | 2021-02-24 | Low-temperature gas recovery device |
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| CN (1) | CN113028276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115900228A (en) * | 2023-03-02 | 2023-04-04 | 杭氧集团股份有限公司 | Device for recycling variable-low-temperature gas and using method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9828120D0 (en) * | 1998-01-08 | 1999-02-17 | British Gas Plc | A method of and apparatus for returning a vaporised gas to its liquid phase |
| JP2011117562A (en) * | 2009-12-05 | 2011-06-16 | Jfe Engineering Corp | Evaporated gas re-liquefying apparatus |
| CN103225740A (en) * | 2013-04-22 | 2013-07-31 | 中国海洋石油总公司 | BOG processing system utilizing pressure energy of LNG receiving station |
| JP2015152136A (en) * | 2014-02-18 | 2015-08-24 | Ｊｆｅエンジニアリング株式会社 | Method and device for mixing cryogenic liquid in storage tank |
| WO2016194056A1 (en) * | 2015-05-29 | 2016-12-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device and evaporated gas re-liquefaction device having same |
| CN108916647A (en) * | 2018-06-25 | 2018-11-30 | 杭州新亚低温科技有限公司 | A kind of cryogenic liquid is converted into the carburetion system of high pressure gas |
| CN211738637U (en) * | 2019-12-04 | 2020-10-23 | 国鸿液化气机械工程（大连）有限公司 | Liquefied gas storage tank boil-off gas processing system |
-
2021
- 2021-02-24 CN CN202110208109.4A patent/CN113028276A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9828120D0 (en) * | 1998-01-08 | 1999-02-17 | British Gas Plc | A method of and apparatus for returning a vaporised gas to its liquid phase |
| JP2011117562A (en) * | 2009-12-05 | 2011-06-16 | Jfe Engineering Corp | Evaporated gas re-liquefying apparatus |
| CN103225740A (en) * | 2013-04-22 | 2013-07-31 | 中国海洋石油总公司 | BOG processing system utilizing pressure energy of LNG receiving station |
| JP2015152136A (en) * | 2014-02-18 | 2015-08-24 | Ｊｆｅエンジニアリング株式会社 | Method and device for mixing cryogenic liquid in storage tank |
| WO2016194056A1 (en) * | 2015-05-29 | 2016-12-08 | Ｊｆｅエンジニアリング株式会社 | Condensing and mixing device and evaporated gas re-liquefaction device having same |
| CN108916647A (en) * | 2018-06-25 | 2018-11-30 | 杭州新亚低温科技有限公司 | A kind of cryogenic liquid is converted into the carburetion system of high pressure gas |
| CN211738637U (en) * | 2019-12-04 | 2020-10-23 | 国鸿液化气机械工程（大连）有限公司 | Liquefied gas storage tank boil-off gas processing system |
Non-Patent Citations (1)
| Title |
|---|
| 魏同成: "喷射管与文丘里管的设计", 《化工设计》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115900228A (en) * | 2023-03-02 | 2023-04-04 | 杭氧集团股份有限公司 | Device for recycling variable-low-temperature gas and using method thereof |
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Application publication date: 20210625 |