CN100402917C - An unloading method for liquid ammonia-transporting tank lorry - Google Patents
An unloading method for liquid ammonia-transporting tank lorry Download PDFInfo
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- CN100402917C CN100402917C CNB2005100422305A CN200510042230A CN100402917C CN 100402917 C CN100402917 C CN 100402917C CN B2005100422305 A CNB2005100422305 A CN B2005100422305A CN 200510042230 A CN200510042230 A CN 200510042230A CN 100402917 C CN100402917 C CN 100402917C
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Abstract
The present invention relates to an unloading method for a liquid ammonia tank car. A gas phase interface and a liquid phase interface of the tank car are respectively connected with a gas phase interface and a liquid phase interface of a storage tank; first, gas is sucked from the storage tank by a gas compressor through a gas phase pipeline and discharged into the tank car so that liquid ammonia in the tank car flows toward the storage tank through the liquid phase pipeline; when the liquid ammonia in the tank car no longer flows toward the storage tank, a liquid phase inlet of the storage tank is shut; then, the gas is sucked from the tank car by the gas compressor and discharged into the storage tank; under the action of the environmental temperature, residual liquid ammonia in the tank car is vaporized and discharged into the storage tank; the gas compressor is not stopped until the gas phase pressure in the tank car is 0.1MPa. The present invention can guarantee the environment to be free from pollution and can avoid the incipient fault of an accident. Unloading is complete and reasonable from the economical angle.
Description
Technical field
The present invention relates to the gas method of discharging from container, specifically a kind of method that liquefied ammonia is unloaded from tank car with liquefaction.
Background technique
At present, to the tank car that is mounted with liquefied ammonia unload in the destination the scheme that generally adopts be: be provided with two pipelines that are communicated with the two between tank car and the storage tank, wherein one be the gas phase pipeline, another is liquid phase pipeline, on liquid phase pipeline, be connected to an ammonia pump, by the running of ammonia pump, make the liquefied ammonia in the tank car advance the people in storage tank by liquid phase pipeline.Such scheme exists following deficiency: the beginning of unloading, to carry out emptying to the liquid phase pipeline at ammonia pump place earlier, to guarantee that ammonia pump can run well, having a spot of liquefied ammonia when emptying is discharged in the external environment, and, when the gas phase pipeline that removes tank car institute acromere after finishing of unloading, liquid phase pipeline, the ammonia that remains in two pipelines also can drain in the external environment, ammonia is discharged to and had both caused certain waste in the external environment, can pollute environment again, and can bring potential safety hazard (ammonia is inflammable, explosive, poisonous); In addition, unload finish after, still can remain a spot of ammonia in the tank car, it is complete inadequately to unload.
Summary of the invention
The object of the present invention is to provide a kind of method of unloading of liquefied ammonia tank vehicle, this method can avoid having ammonia to be discharged in the external environment in the whole process of unloading, and it is more thorough to unload.
For achieving the above object, the method applied in the present invention is as follows:
The gas phase interface of tank car, liquid phase interface join by gas phase interface, the liquid phase interface of gas phase pipeline, liquid phase pipeline and storage tank respectively, at first pass through air-breathing from storage tank, the exhaust in tank car of gas phase pipeline by gas compressor, make the interior gaseous pressure of storage tank less than the gaseous pressure in the tank car, the liquefied ammonia in the tank car flows to storage tank by liquid phase pipeline; When the liquefied ammonia in the tank car no longer flows in storage tank; close the liquid phase interface of storage tank; pass through air-breathing from tank car, the exhaust in storage tank of gas phase pipeline by gas compressor again; under the effect of ambient temperature; the interior remaining liquefied ammonia of tank car is constantly vaporized and is passed through the gas phase tubes rows to storage tank; when the gaseous pressure in tank car reached 0.1Mpa, gas compressor was shut down.
After gaseous pressure in tank car reaches 0.1Mpa and gas compressor shutdown; close the gas phase interface of storage tank and gas phase interface, the liquid phase interface of tank car; with tank car external gas phase pipeline, liquid phase pipeline part and ammonia absorber connect, absorb residue ammonia in this part gas phase pipeline, the liquid phase pipeline by ammonia absorber.Treat tank car do not have ammonia in external gas phase pipeline, the liquid phase pipeline after, with tank car external gas phase pipeline, the liquid phase pipeline of external gas phase pipeline, liquid phase pipeline and storage tank separate, unload and finish.
Adopt said method provided by the present invention, when carrying out liquefied ammonia tank vehicle and unload, can stop the phenomenon of emission intensity in the external environment fully, and it is more thorough to unload.Therefore, the method for unloading of liquefied ammonia tank vehicle provided by the present invention can either guarantee that environment is not contaminated, can avoid the hidden danger of accident again.In addition unload at last to remain in tank car external gas phase pipeline, the ammonia in the liquid phase pipeline further absorb, from the angle of economy, more reasonable.
Description of drawings
Accompanying drawing is for realizing the fundamental diagram of a specific embodiment of the present invention.
Embodiment
Further specify the present invention below in conjunction with embodiment and accompanying drawing.
Referring to accompanying drawing
The gas phase interface of tank car 1, liquid phase jointing are respectively equipped with gas valve 2, liquid phase valve 3, and the gas phase interface of tank car 1, liquid phase interface are connected to gas phase pipeline 4, liquid phase pipeline 15 respectively by gas valve 2, liquid phase valve 3.Fixing respectively gas phase pipeline 12, the liquid phase pipeline 13 of being connected on the gas phase interface of storage tank 10, the liquid phase interface.Gas phase pipeline 4 joins with gas phase pipeline 12, liquid phase pipeline 15 joins with liquid phase pipeline 13, the gas phase interface of gas phase interface by gas phase pipeline 4,12 and storage tank 10 that is tank car 1 joins, and the liquid phase interface of tank car 1 joins by the liquid phase interface of liquid phase pipeline 15,13 and storage tank 10.Be connected to a two-position four way change valve 7 on gas phase pipeline 12, two interfaces and the gas phase pipeline 12 of two-position four way change valve 7 join, and the suction port of gas compressor 8 and relief opening join with two interfaces in addition of two-position four way change valve 7 respectively.On gas phase pipeline 12, liquid phase pipeline 13, also be respectively equipped with gas valve 6, liquid phase valve 14.The front end of gas phase pipeline 4, liquid phase pipeline 15 also joins by bleed valve 5 and gas exhaust piping 9, and the other end of gas exhaust piping 9 and ammonia absorber 11 join.Gas valve 2,6, liquid phase valve 3,14 and bleed valve 5 adopt the stop valve of high leak tightness.Two-position four way change valve 7 adopts hand-operated direction valve.Gas compressor 8 adopts ZW type ammonia recycle compressors, and its performance index are: pressure of inspiration(Pi) (Mpa) 1.0, exhaust pressure (Mpa) 1.5, delivery temperature (℃)≤110.Ammonia absorber 11 is selected the AXST-240 type for use.In addition, the selected gas compressor of present embodiment is applicable to that tonnage is at the tank car below 10 tons.
Tank car 1, storage tank 10 and ammonia absorber 11 are pressed accompanying drawing and are connected cloth postpone, open gas valve 2,6 and liquid phase valve 3,14, handle two-position four way change valve 7, the suction port and the storage tank 10 of gas compressor 8 are joined, relief opening and tank car 1 join, start gas compressor 8, pass through gas phase pipeline 12 by it, 4 is air-breathing from storage tank 10, exhaust in tank car 1, the gaseous pressure that makes storage tank interior 10 is less than the gaseous pressure in the tank car 1, just make between the interior gas phase of gas phase and tank car 1 in the storage tank 10 and form pressure difference, under this action of pressure, the liquefied ammonia in the tank car 1 is by liquid phase pipeline 15,13 flow to storage tank 10.When the level meter of tank car 1 and storage tank 10 outsides no longer changes, show that the liquefied ammonia in the tank car 1 no longer 10 flows in storage tank, and the liquid level of liquefied ammonia has reached the liquid level lower limit in the tank car 1, the overwhelming majority of liquefied ammonia has been discharged in the storage tank 10 in the tank car 1.At this moment; close the liquid phase interface of storage tank 10; just close liquid phase valve 14; and gas compressor 8 is shut down; switch two-position four way change valve 7; the suction port and the tank car 1 of gas compressor 8 are joined; relief opening and storage tank 10 join; start gas compressor 8 once more; pass through gas phase pipeline 4 by it; 12 is air-breathing from tank car 1; exhaust in storage tank 10; air pressure in the tank car 1 is constantly descended; in this process; under the effect of ambient temperature; constantly vaporization and under the effect of gas compressor 8, of remaining liquefied ammonia in the tank car 1 by gas phase pipeline 4; 12 rows (are reflected by the pressure gauge on the tank car) when the gaseous pressure in tank car 1 reaches 0.1MPa to storage tank 10; the level meter of storage tank 10 outsides no longer changes; the process that shows remaining liquefied ammonia vaporization in the tank car 1 is also finished substantially, at this moment, gas compressor 8 is shut down.At last, close gas valve 2,6 and liquid phase valve 3, just close the gas phase interface of storage tank 10 and gas phase interface, the liquid phase interface of tank car 1, open bleed valve 5, on the tank car 1 external gas phase pipeline 4, liquid phase pipeline 15 connect with ammonia absorber 11, further absorb gas phase pipeline 4 external on the tank car 1, the residue ammonia in the liquid phase pipeline 15 by ammonia absorber 11, through 2～3 seconds time, the ammonia in gas phase pipeline 4, the liquid phase pipeline 15 can all be arranged the people in ammonia absorber 11.After ammonia in gas phase pipeline 4, the liquid phase pipeline 15 has been arranged, with tank car 1 external gas phase pipeline 4, liquid phase pipeline 15 and storage tank 10 external gas phase pipeline 12, liquid phase pipeline 13 separate, unload and finish.
Claims (2)
1. the method for unloading of a liquefied ammonia tank vehicle, the gas phase interface of tank car, liquid phase interface join by gas phase interface, the liquid phase interface of gas phase pipeline, liquid phase pipeline and storage tank respectively, it is characterized in that: at first pass through air-breathing from storage tank, the exhaust in tank car of gas phase pipeline by gas compressor, make the interior gaseous pressure of storage tank less than the gaseous pressure in the tank car, the liquefied ammonia in the tank car flows to storage tank by liquid phase pipeline; When the liquefied ammonia in the tank car no longer flows in storage tank; close the liquid phase interface of storage tank; pass through air-breathing from tank car, the exhaust in storage tank of gas phase pipeline by gas compressor again; under the effect of ambient temperature; the interior remaining liquefied ammonia of tank car is constantly vaporized and is passed through the gas phase tubes rows to storage tank; when the gaseous pressure in tank car reached 0.1Mpa, gas compressor was shut down.
2. the method for unloading of liquefied ammonia tank vehicle according to claim 1; it is characterized in that: after the gaseous pressure in tank car reaches 0.1Mpa and gas compressor shutdown; close the gas phase interface of storage tank and gas phase interface, the liquid phase interface of tank car; with tank car external gas phase pipeline, liquid phase pipeline part and ammonia absorber connect, absorb residue ammonia in this part gas phase pipeline, the liquid phase pipeline by ammonia absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100422305A CN100402917C (en) | 2005-03-25 | 2005-03-25 | An unloading method for liquid ammonia-transporting tank lorry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100422305A CN100402917C (en) | 2005-03-25 | 2005-03-25 | An unloading method for liquid ammonia-transporting tank lorry |
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| Publication Number | Publication Date |
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| CN1837671A CN1837671A (en) | 2006-09-27 |
| CN100402917C true CN100402917C (en) | 2008-07-16 |
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| CNB2005100422305A Expired - Fee Related CN100402917C (en) | 2005-03-25 | 2005-03-25 | An unloading method for liquid ammonia-transporting tank lorry |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705709A (en) * | 2012-07-03 | 2012-10-03 | 宿州中粮生物化学有限公司 | Unloading structure of low temperature ethylene tank vehicle |
| CN103527925A (en) * | 2013-10-23 | 2014-01-22 | 攀钢集团钛业有限责任公司 | Method for reducing chlorine loss in liquid chlorine unloading process |
| CN104075109A (en) * | 2014-06-29 | 2014-10-01 | 李安民 | Technique and device of liquefied chlorine unloading system |
| CN105736935A (en) * | 2016-04-20 | 2016-07-06 | 海宁市英德赛电子有限公司 | High-purity ammonia tank truck treatment system and using method thereof |
| CN108224829B (en) * | 2016-12-14 | 2020-10-27 | 贵州芭田生态工程有限公司 | Liquid ammonia delivery system and liquid ammonia delivery method |
| CN106693815A (en) * | 2017-02-17 | 2017-05-24 | 青岛长荣化工科技有限公司 | Ammonia-water preparation device and preparation method |
| CN108506726B (en) * | 2018-04-11 | 2024-01-19 | 青岛乐戈新能源科技有限公司 | Unloading system and unloading method of low-temperature liquid tank car |
| CN108916644A (en) * | 2018-08-01 | 2018-11-30 | 峨眉山长庆新材料有限公司 | Silicon tetrachloride unloads bassinet structure and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0408979A1 (en) * | 1989-07-19 | 1991-01-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Method and system for throwing carbon dioxide into the deep sea |
| CN1178300A (en) * | 1997-10-28 | 1998-04-08 | 童德明 | All functional storing and filling system for small liquid gas station |
| CN1286213A (en) * | 1999-08-30 | 2001-03-07 | 巴陵石化鹰山石油化工厂 | Method for unloading liquid ammonia from tank truck |
-
2005
- 2005-03-25 CN CNB2005100422305A patent/CN100402917C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0408979A1 (en) * | 1989-07-19 | 1991-01-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Method and system for throwing carbon dioxide into the deep sea |
| CN1178300A (en) * | 1997-10-28 | 1998-04-08 | 童德明 | All functional storing and filling system for small liquid gas station |
| CN1286213A (en) * | 1999-08-30 | 2001-03-07 | 巴陵石化鹰山石油化工厂 | Method for unloading liquid ammonia from tank truck |
Non-Patent Citations (4)
| Title |
|---|
| 浮法线液氨卸车系统的改进与应用. 沈斌.中国玻璃，第30卷第1期. 2005 |
| 浮法线液氨卸车系统的改进与应用. 沈斌.中国玻璃，第30卷第1期. 2005 * |
| 液氨的卸车方法. 牟邦立.中国有色冶金，第1期. 1981 |
| 液氨的卸车方法. 牟邦立.中国有色冶金，第1期. 1981 * |
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| CN1837671A (en) | 2006-09-27 |
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Assignee: Anhui Fangxing Science & Technology Co., Ltd. Assignor: Anhui Huaguang Glass Group Corp., Ltd. Contract fulfillment period: 2008.8.18 to 2025.3.25 contract change Contract record no.: 2009340000065 Denomination of invention: An unloading method for liquid ammonia-transporting tank lorry Granted publication date: 20080716 License type: Exclusive license Record date: 2009.4.24 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.8.18 TO 2025.3.25; CHANGE OF CONTRACT Name of requester: ANHUI FANGXING SCIENCE CO., LTD. Effective date: 20090424 |
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