CN1116544C - Method for unloading liquid ammonia from tank truck - Google Patents
Method for unloading liquid ammonia from tank truck Download PDFInfo
- Publication number
- CN1116544C CN1116544C CN 99115545 CN99115545A CN1116544C CN 1116544 C CN1116544 C CN 1116544C CN 99115545 CN99115545 CN 99115545 CN 99115545 A CN99115545 A CN 99115545A CN 1116544 C CN1116544 C CN 1116544C
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- China
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- liquid ammonia
- tank
- ammonia
- tube side
- tank truck
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Abstract
The present invention relates to a method for loading and unloading liquid ammonia from a tank truck, which is characterized in that a refrigeration compressor is started so as to pump and suck the liquid ammonia gas phases of an evaporator for compression and temperature rise; the liquid ammonia gas phases enter a condenser to exchange cold for being converted into liquid ammonia which returns to the evaporator; the liquid phases continuously suck the heat quantity of the liquid ammonia of the tank truck for vaporization. The heat quantity flows through a tube side. Large amounts of heat quantity of the liquid ammonia of the tank truck, which flows through the tube side, is carried off. Therefore, the temperature of the heat quantity is converted into between subzero 10 to 10 DEG C from 20 to 40 DEG C. At the same time, a pressurization compressor is started so as to extract the gas phases of a liquid ammonia storage tank. The gas phases enter the top of the tank truck after compression and temperature rise. Thus, the liquid ammonia of the tank truck is continuously cooled by the evaporator and flows to the liquid ammonia storage tank under the action of pressure difference. Therefore, the present invention can satisfy the requirement that a normal pressure storage tank or a high-voltage storage cylinder is used for loading and unloading the liquid ammonia of the tank truck so as to realize gas phase recovery of the tank truck.
Description
The present invention relates to a kind of method of unloading liquid ammonia from tank truck.
Unloading liquid ammonia from tank truck adopts the method for steam heating supercharging usually, and (0.7～1.0MPa) contraposition is after gas phase and liquid phase oil filling riser connect, with liquefied ammonia in the special-purpose storage tank at liquefied ammonia tank vehicle.Use steam heating, after the supercharging that makes it to gasify reaches 1.0～1.4MPa, enter the tank car top by the gas phase pipe, liquid phase in the tank car like this, under differential pressure action, flow to liquid ammonia storage tank (0.7～1.0MPa), up to tank car but till the sky.
In service in practical operation, liquid ammonia storage tank must guarantee it is high pressure storage tank, must be provided with the special-purpose storage tank of high pressure of band heating coil, gas phase can not reclaim in the tank car, simultaneously, special-purpose storage tank emptying step-down reaches each 1 hour cool time, and the tank car quantity of unloading continuously is 12/day.
Owing to adopted method of the present invention, satisfied atmospheric storage tank or the high pressure storage tank tank car liquefied ammonia of unloading basically, realize that the tank car gas phase reclaims.
The object of the present invention is to provide a kind of method of unloading liquid ammonia from tank truck.
The present invention is achieved in that with pressure to be the liquefied ammonia tank vehicle contraposition of 0.7～1.0MPa, starting outlet temperature is 100～150 ℃, outlet pressure is the refrigeration compressor of 0.8～1.6MPa, the compression of suction vaporizer liquefied ammonia gas phase heats up, entering pressure is 0.8～1.6MPa, the condenser that cooling water temperature is 20～40 ℃ changes the cold Returning evaporimeter behind the liquefied ammonia that becomes, the evaporator shell stroke pressure is 0.1～0.5MPa, the tube side outlet pressure is 0.1～1.0MPa, the tube side outlet temperature is-10～+ 10 ℃, and the tube side flow is 10～15M
3/ H, liquid level 500～800mm, liquid phase then constantly absorbs the heat of the tank car liquefied ammonia that tube side flows through and vaporizes, and the tank car liquefied ammonia heat that flows through tube side is taken away in a large number, temperature becomes-10～+ 10 ℃ by+20～+ 40 ℃, meanwhile, start the pressurization compressor, the pressurization compressor exit temperature is 100～150 ℃, and outlet pressure is 0.8～1.6MPa, extracts the liquid ammonia storage tank gas phase, after the compressed intensification, enter the tank car top, tank car liquefied ammonia is under differential pressure action like this, and the cracked ends evaporator cools does not flow to liquid ammonia storage tank.Import at vaporizer is provided with a cover switching valve group, directly enters high pressure storage tank to satisfy tank car liquefied ammonia.Respectively be provided with a cover switching valve group at pressurization compressor and refrigeration compressor import and export, give another tank car supercharging, finish the tank car gas phase and reclaim to satisfy a tank car.Being provided with a cover switching valve group on storage tank gas phase pipeline, is the step-down of storage tank refrigeration by compressor, and the support of storage tank safe storage is provided.
Fig. 1 is the schematic flow sheet of unloading liquid ammonia from tank truck
In conjunction with the accompanying drawings: the liquefied ammonia gas phase of evaporimeter in 6., 4. compress intensification by refrigeration compressor, Enter condenser and 5. change the cold liquefied ammonia that becomes, Returning evaporimeter 6., tank wagon 1. or the liquefied ammonia of train tank car in 2., Enter evaporimeter 6. heat exchange takes place, cool to-10～+ 10 ℃ by+20～+ 40 ℃ and enter atmospheric storage tank 8.. Vapour 1. or the liquefied ammonia of train tank car in 2. 7. the recessing car directly enters high pressure storage tank by the transfer valve group. Meanwhile 7. or the liquefied ammonia gas phase of atmospheric storage tank in 8. 3. high pressure storage tank compresses intensification by the pressurization compressor, enters automobile 1. or 2. top of train tank car tank car.
When good effect of the present invention was unloading liquid ammonia from tank truck, liquid ammonia storage tank can be high pressure storage tank, also can be atmospheric storage tank, realized that effectively the tank car gas phase reclaims, by every tank wagon 20M3, gas phase overbottom pressure 0.3MPa after reclaiming, Liquid ammonia recovery reaches 80Kg, as year the amount of unloading be 60000T, liquid ammonia recovery 400T/Y, simultaneously, the tank car of unloading continuously Quantity is former methodical 2 times.
Embodiment 1;
1. in liquefied ammonia tank vehicle (0.7MPa) contraposition, after gas phase and liquid phase oil filling riser connect, start refrigeration compressor, suction vaporizer (its shell side pressure 0.4MPa, tube side outlet pressure 0.5MPa, 0 ℃ of tube side outlet temperature, liquid level 600mm), the gas ammonia compression heats up (1.4MPa, 140 ℃) Returning evaporimeter.Like this, the vaporizer gas ammonia is constantly taken away by compressor, and liquid phase then constantly absorbs the heat of the tank car liquefied ammonia that tube side flows through and vaporizes, and the tank car liquefied ammonia heat that flows through tube side is taken away in a large number, and temperature becomes 0 ℃ by+30 ℃, and flow is 10M
3/ h enters liquid ammonia storage tank.2. start the pressurization compressor, extract liquid ammonia storage tank (0.7MPa) gas phase, compressed intensification (1.4MPa, 140 ℃) after, enter the tank car top by the gas phase pipeline, draw the gas ammonia that ammonia uses and then enter condenser, like this, the liquefied ammonia of tank car is under differential pressure action, and the cracked ends evaporator cools does not flow to liquid ammonia storage tank.
Embodiment 2:
1. import and export at vaporizer and be provided with a cover switching valve group, automobile/train tank car liquefied ammonia through the refrigeration compressor refrigeration, enters the normal pressure liquid ammonia storage tank by the vaporizer cooling through the pressurization compressor boost.
2. automobile/train tank car liquefied ammonia directly enters the high-pressure liquid ammonia storage tank through the pressurization compressor boost.
Embodiment 3:
Extract the gas phase of a tank car by the pressurization compressor and give another tank car supercharging, also can extract the tank car gas phase with refrigeration compressor is that vaporizer draws ammonia, and the gas phase of finishing tank car reclaims.
Embodiment 4:
Pressurization compressor or refrigeration compressor extract the liquid ammonia storage tank gas phase, enter condenser liquefaction after the compressed intensification, then, enter liquid ammonia storage tank, and like this, constantly vaporization liquefaction again of liquid ammonia storage tank is played the refrigeration hypotensive effect, for the storage tank safe storage provides support.
Claims (2)
1. the method for a unloading liquid ammonia from tank truck, it is characterized in that: start refrigeration compressor, the compression of suction vaporizer liquefied ammonia gas phase heats up, enter condenser and change the cold liquefied ammonia that becomes, Returning evaporimeter, liquid phase then constantly absorbs the heat of the tank car liquefied ammonia that tube side flows through and vaporizes, and the tank car liquefied ammonia heat that flows through tube side taken away in a large number, and temperature becomes-10～+ 10 ℃ by+20～+ 40 ℃, meanwhile, start the pressurization compressor, extract the liquid ammonia storage tank gas phase, after the compressed intensification, enter the tank car top, like this, the liquefied ammonia of tank car is under differential pressure action, and the cracked ends evaporator cools does not flow to liquid ammonia storage tank.
2. the method for a kind of unloading liquid ammonia from tank truck according to claim 1, it is characterized in that, evaporator shell stroke pressure 0.1～0.5Mpa, tube side outlet pressure 0.1～1.0Mpa, tube side outlet temperature-10～+ 10 ℃, tube side flow 10～15M3/h, liquid level 500～800mm, 100～150 ℃ of refrigeration compressor and pressurization compressor exit temperatures, outlet pressure 0.8～1.6Mpa, condenser pressure 0.8～1.6Mpa, 20～40 ℃ of cooling water temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115545 CN1116544C (en) | 1999-08-30 | 1999-08-30 | Method for unloading liquid ammonia from tank truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115545 CN1116544C (en) | 1999-08-30 | 1999-08-30 | Method for unloading liquid ammonia from tank truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1286213A CN1286213A (en) | 2001-03-07 |
| CN1116544C true CN1116544C (en) | 2003-07-30 |
Family
ID=5278487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99115545 Expired - Fee Related CN1116544C (en) | 1999-08-30 | 1999-08-30 | Method for unloading liquid ammonia from tank truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1116544C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402917C (en) * | 2005-03-25 | 2008-07-16 | 安徽华光玻璃集团有限公司 | An unloading method for liquid ammonia-transporting tank lorry |
| WO2009044651A1 (en) * | 2007-10-05 | 2009-04-09 | Mitsubishi Chemical Corporation | Process for charging liquefied ammonia, process for production of nitride crystals, and reactor for growth of nitride crystals |
| 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 |
-
1999
- 1999-08-30 CN CN 99115545 patent/CN1116544C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1286213A (en) | 2001-03-07 |
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