CN214792183U - Ammonia boil-off gas compression reliquefaction recovery system - Google Patents
Ammonia boil-off gas compression reliquefaction recovery system Download PDFInfo
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- CN214792183U CN214792183U CN202120362114.6U CN202120362114U CN214792183U CN 214792183 U CN214792183 U CN 214792183U CN 202120362114 U CN202120362114 U CN 202120362114U CN 214792183 U CN214792183 U CN 214792183U
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Abstract
The utility model provides an ammonia evaporation gas compression reliquefaction recovery system, compact structure, simple to operate, easy operation has effectively solved the problem that adopts the lubricated compressor of oil to pollute the medium among the BOG liquefaction system, has reduced whole equipment investment simultaneously. The outlet of the storage tank is connected with the inlet of the gas-liquid separator; the outlet of the gas-liquid separator is connected with the inlet of the compressor; the outlet of the compressor is connected with the inlet of the primary oil separator; the outlet of the primary oil separator is connected with the inlet of the secondary oil separator; the outlet of the secondary oil separator 5 is connected with the inlet of the cooler through a pipeline, and a gas mass flowmeter is arranged on the pipeline; the outlet of the cooler is connected with the inlet of the liquid storage device; the outlet of the liquid storage device is connected with the inlet of the economizer; the liquid outlet of the economizer is connected with the inlet of the storage tank, and the gas outlet of the economizer is connected with the inlet of the compressor; the compressor is an oil lubrication compressor.
Description
Technical Field
The utility model relates to an ammonia vapor compression reliquefaction recovery system.
Background
With the continuous development of domestic storage and transportation industry, the normal pressure storage process is more and more favored. Liquid ammonia is used as an important chemical raw material, and is increasingly stored at low temperature and normal pressure. Because the constant-pressure storage tank is continuously filled and absorbs heat to generate a large amount of boil-off gas (BOG) in the storage process, in order to ensure the quality of export products, the BOG is mostly recovered through an oil-free compression reliquefaction scheme at present. The mature technology without the compressor is almost monopolized abroad, the cost of the compressor is high, and the supply period is long; and the compressor is not stable in operation at home, no effective monitoring means is provided for the oil content in the recovered medium when the compressor is recovered at home, once the oil content in the medium exceeds the standard, subsequent materials are polluted, and a downstream reaction device can be stopped when the oil content is serious.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide an ammonia evaporation gas compression reliquefaction recovery system, compact structure, simple to operate, easy operation has effectively solved the problem that adopts the lubricated compressor of oil to pollute the medium among the BOG liquefaction system, has reduced whole equipment investment simultaneously.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides an ammonia boil-off gas compression reliquefaction recovery system which characterized in that: the system comprises a storage tank, a gas-liquid separator, a compressor, a primary oil separator, a secondary oil separator, a gas mass flowmeter, a cooler, a liquid storage device and an economizer; the outlet of the storage tank is connected with the inlet of the gas-liquid separator; the outlet of the gas-liquid separator is connected with the inlet of the compressor; the outlet of the compressor is connected with the inlet of the primary oil separator; the outlet of the primary oil separator is connected with the inlet of the secondary oil separator; the outlet of the secondary oil separator 5 is connected with the inlet of the cooler through a pipeline, and a gas mass flowmeter is arranged on the pipeline; the outlet of the cooler is connected with the inlet of the liquid storage device; the outlet of the liquid storage device is connected with the inlet of the economizer; the liquid outlet of the economizer is connected with the inlet of the storage tank, and the gas outlet of the economizer is connected with the inlet of the compressor; the compressor is an oil lubrication compressor.
The storage tank on be provided with pressure instrument, pressure instrument is connected with the compressor.
The heater is installed to primary oil separator bottom.
The primary oil separator is provided with a sight glass.
The export of storage tank be provided with the trip valve.
The cooler of the utility model is a water cooler.
Compared with the prior art, the utility model, have following advantage and effect: through adopting the oil lubrication compressor, twice oil filters, guarantees the filter fineness, increases gas mass flow meter simultaneously, to the compressed gas real-time on-line monitoring who has contacted with lubricating oil, ensures that the oil content of being retrieved the medium is up to standard. The process is simple, the reliability is high, the response speed of starting and stopping the equipment is high, and the variable load adaptability of the compressor is high; meanwhile, the imported movable equipment is replaced by domestic mature equipment, so that the project supply period is shortened, the investment cost is greatly reduced, no discharge exists in the system operation process, the chemical property of the gas is not changed, and the compressed gas is not polluted.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
The embodiment of the utility model provides a including storage tank 1, vapour and liquid separator 2, compressor 3, primary oil separator 4, secondary oil separator 5, gaseous mass flow meter 6, cooler 7, reservoir 8 and economic ware 9.
The outlet of the storage tank 1 is connected with the inlet of the gas-liquid separator 2; the outlet of the gas-liquid separator 2 is connected with the inlet of the compressor 3; the outlet of the compressor 3 is connected with the inlet of the primary oil separator 4; the outlet of the primary oil separator 4 is connected with the inlet of the secondary oil separator 5; the outlet of the secondary oil separator 5 is connected with the inlet of a cooler 7 through a pipeline, and a gas mass flowmeter 6 is arranged on the pipeline; the outlet of the cooler 7 is connected with the inlet of the liquid storage device 8; the outlet of the liquid storage device 8 is connected with the inlet of the economizer 9; the liquid outlet of the economizer 9 is connected to the inlet of the storage tank 1 and the gas outlet is connected to the inlet of the compressor 3.
The outlet of the storage tank 1 is provided with a shut-off valve.
The storage tank 1 is a vertical cylindrical flat-bottom self-supporting normal-pressure storage tank, the storage temperature is-33 ℃ to-30 ℃, and the pressure is 5-18 kpa g; the pressure instrument is arranged on the storage tank 1 and connected with the compressor 3, so that the start-stop linkage is realized, when the pressure of the storage tank 1 rises to be more than or equal to 10kapg, the compressor 3 is started, and when the pressure of the storage tank 1 is less than 5kapg, the compressor 3 is stopped in a linkage manner.
The compressor 3 is an oil lubrication compressor, particularly an oil injection screw compressor, the load adjustment range is 0-100%, and ammonia gas is compressed to 1.3-1.8 MPaA by the compressor.
The primary oil separator 4 is used as an oil pool and consists of a plurality of parts, oil is separated by two sections, the first section is used for separating by changing the direction and the speed, and a polymerization filter material is arranged in the second section for separating oil mist; a sight glass is arranged on the primary oil separator 4; the primary oil separator 4 is provided with a heater at the bottom thereof so as to maintain the temperature of the oil during shutdown, and the primary oil separator 4 can be designed to be vertical or horizontal according to application requirements. The oil entrainment rate is less than or equal to 5 ppm.
The secondary oil separator 5 adopts a vertical structure, 4 filter barrels are arranged in the vertical structure, the filter barrels are supported in the secondary oil separator 5 by a suspender, and the filtering precision is less than 1 ppm.
The gas mass flowmeter 6 adopts a particulate matter electrostatic induction technology, and the core principle is that two electrodes are utilized to detect electrostatic induction signals when particulate matters pass through; the flight time of the fluid passing through the two electrodes is obtained by comparing the same characteristic signals collected by the two electrodes arranged at a fixed distance, and the fluid flow rate is calculated according to the fixed distance and the flight time. The material of the outer shell is not lower than 304SS, the lining is made of PTFE, PEEK, ceramics or other wear-resistant materials, the measured value can be displayed in real time, the error is less than 2%, the value can be connected to a control loop of a pneumatic conveying system, effective parameters are provided for optimizing process control, the downstream control oil content index is 8ppm, a high alarm with the oil content of 0.9ppm, a high alarm with the oil content of 3ppm and a chain shutdown with the oil content of 5ppm are set, and the purity of the compressed gas is guaranteed.
The cooler 7 is a water cooler, ammonia gas is condensed into a liquid phase at the temperature of 20-40 ℃.
The liquid storage device 8 and the economizer 9 are made of carbon steel and can be selected to be vertical or horizontal according to practical application.
Ammonia evaporation gas sent out from a storage tank 1 (the storage temperature is minus 33 ℃ to minus 30 ℃, and the pressure is 5 to 18 kpa) enters a gas-liquid separator 2 through a pipeline, gas-liquid separation is carried out in the gas-liquid separator 2, then the ammonia evaporation gas enters an oil-containing lubricating compressor 3 through a pipeline to be compressed to 1.3 MpaA to 1.8MpaA, and then the ammonia evaporation gas sequentially enters a primary oil separator 4, a secondary oil separator 5 and a gas mass flowmeter 6 to be subjected to oil filtration and online analysis, so that the oil content is controlled to be less than 1 ppm; when the central control display of the gas mass flow meter 6 is greater than 0.9ppm, the high alarm is given, when the central control display is 1-3 ppm, the high alarm is given, when the central control display is 5-8 ppm, the compressor is stopped to run in a linkage mode, and the operation is switched to the standby machine. The ammonia evaporation gas after oil removal is cooled to 30-40 ℃ by a cooler 7 to become normal-temperature liquid ammonia, the liquid ammonia enters a liquid storage device 8 for temporary storage, the liquid in the liquid storage device 8 enters an economizer 9 in two ways, one way is throttled and cooled to 0.16-0.18 MPaA and minus 25 ℃ to minus 19 ℃, cold energy of 1.3-1.8 MpaA is provided for the other way, and the cold energy is cooled to minus 11 ℃ to minus 20 ℃ and then returned to a storage tank 1 for storage. Wherein the compressor 3 has stepless regulation of 0-100%.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides an ammonia boil-off gas compression reliquefaction recovery system which characterized in that: the system comprises a storage tank, a gas-liquid separator, a compressor, a primary oil separator, a secondary oil separator, a gas mass flowmeter, a cooler, a liquid storage device and an economizer; the outlet of the storage tank is connected with the inlet of the gas-liquid separator; the outlet of the gas-liquid separator is connected with the inlet of the compressor; the outlet of the compressor is connected with the inlet of the primary oil separator; the outlet of the primary oil separator is connected with the inlet of the secondary oil separator; the outlet of the secondary oil separator is connected with the inlet of the cooler through a pipeline, and a gas mass flowmeter is arranged on the pipeline; the outlet of the cooler is connected with the inlet of the liquid storage device; the outlet of the liquid storage device is connected with the inlet of the economizer; the liquid outlet of the economizer is connected with the inlet of the storage tank, and the gas outlet of the economizer is connected with the inlet of the compressor; the compressor is an oil lubrication compressor.
2. The ammonia boil-off gas compression reliquefaction recovery system of claim 1, wherein: the storage tank is provided with a pressure instrument, and the pressure instrument is connected with the compressor.
3. The ammonia boil-off gas compression reliquefaction recovery system of claim 1, wherein: the bottom of the primary oil separator is provided with a heater.
4. The ammonia boil-off gas compression reliquefaction recovery system of claim 1, wherein: and a sight glass is arranged on the primary oil separator.
5. The ammonia boil-off gas compression reliquefaction recovery system of claim 1, wherein: the outlet of the storage tank is provided with a stop valve.
6. The ammonia boil-off gas compression reliquefaction recovery system of claim 1, wherein: the cooler is a water cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120362114.6U CN214792183U (en) | 2021-02-09 | 2021-02-09 | Ammonia boil-off gas compression reliquefaction recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120362114.6U CN214792183U (en) | 2021-02-09 | 2021-02-09 | Ammonia boil-off gas compression reliquefaction recovery system |
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| Publication Number | Publication Date |
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| CN214792183U true CN214792183U (en) | 2021-11-19 |
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| CN202120362114.6U Active CN214792183U (en) | 2021-02-09 | 2021-02-09 | Ammonia boil-off gas compression reliquefaction recovery system |
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| CN (1) | CN214792183U (en) |
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2021
- 2021-02-09 CN CN202120362114.6U patent/CN214792183U/en active Active
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