CN202660241U - Unloading structure of low-temperature ethylene tank car - Google Patents
Unloading structure of low-temperature ethylene tank car Download PDFInfo
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- CN202660241U CN202660241U CN 201220318060 CN201220318060U CN202660241U CN 202660241 U CN202660241 U CN 202660241U CN 201220318060 CN201220318060 CN 201220318060 CN 201220318060 U CN201220318060 U CN 201220318060U CN 202660241 U CN202660241 U CN 202660241U
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Abstract
The utility model discloses an unloading structure of a low-temperature ethylene tank car. The tank car is connected with a shielding pump through a liquid-phase unloading pipeline and a reverse circulation pipeline; a liquid-phase outlet pipeline of the shielding pump is connected with a ball tank; the liquid-phase unloading pipeline comprises a first flexible pipe and a first metal pipe; the first metal pipe comprises a horizontal section and a vertical section; a first stop valve is arranged between the first flexible pipe and the horizontal section; a safety valve is arranged on the horizontal section; second and third stop valves are arranged in the reverse circulation pipeline and the liquid-phase outlet pipeline; the diameters of the first flexible pipe and the first stop valve are 100 mm; a reverse circulation branch pipeline is arranged between the liquid-phase unloading pipeline and the reverse circulation pipeline; one end of the reverse circulation branch pipeline is positioned on the horizontal section and between the first stop valve and the safety valve, and the other end of the reverse circulation branch pipeline is positioned on the reverse circulation pipeline and between the second stop valve and a reverse circulation outlet of the shielding pump; a fourth stop valve is arranged in the reverse circulation branch pipeline; and the heights of the reverse circulation branch pipeline and the fourth valve are smaller than those of the reverse circulation pipeline and the second stop valve. By adoption of the structure, the shielding pump continuously and safely operates, and liquid-phase ethylene unloading operation can be smoothly performed.
Description
Technical field
The utility model relates to a kind of low temperature ethylene tank car and unloads bassinet structure.
Technical background
Ethene is important petrochemical industry basic material.The ethene mode of movement has two kinds: during (1) close together, adopt the pipeline gas-phase transport; When (2) distant, adopting tank car pressure is the 0.0MPa(gauge pressure) the liquid phase means of transportation.Liquid phase ethylene stores also dual mode: (1) pressure is the 0.0MPa(gauge pressure), low temperature (104 ℃) stores; (2) press (2.0MPa), spherical tank (27 ℃) to store in.
By tank car liquid phase ethylene is transported to spherical tank, uses the canned motorpump of multistage centrifugal structural type.
Existing low temperature ethylene tank car unloads bassinet structure, for: the liquid phase interface of tank car, the gas phase interface is respectively by the liquid phase pipeline of unloading, the liquid phase import of contrary circulation loop and canned motorpump, contrary loop exit joins, liquid-phase outlet pipeline and the spherical tank of canned motorpump join, the described liquid phase pipeline of unloading comprises the first flexible pipe, the first metal tube, the first metal tube comprises horizontal segment and the vertical section of connection, be provided with the first stop valve between the first flexible pipe and the horizontal segment, horizontal segment is provided with safety valve, the liquid phase interface of the first flexible pipe and tank car joins, the liquid phase import of vertical section and canned motorpump is joined, contrary circulation loop, be respectively equipped with the second stop valve in the liquid-phase outlet pipeline, the 3rd stop valve, the first flexible pipe, the diameter of the first stop valve is 50mm.
To unload bassinet structure unreasonable on structural design because of existing, so that there is following defective in it:
When 1, canned motorpump moves, need one contrary circulating liquid ethene that the bearing of pump is cooled off, and then turn back to tank car through contrary circulation loop.The contrary circular flow of canned motorpump is designed to 14 m
3 / h, the liquid-phase outlet flow that adds canned motorpump is 18～23 m
3 / h, the flow of pipeline reaches 32～37m so that liquid phase is unloaded
3 / h, at this moment, liquid ethylene is the first flexible pipe of 50mm at diameter, the flow velocity in the first stop valve is 4.6～5.3 m/s, and this flow velocity is much larger than the liquid ethylene design current velocity of 2m/s, liquid ethylene is subject to larger flow resistance in the first flexible pipe, the first stop valve, liquid ethylene is vaporized.Gas ethene enters and vapour just can occur behind the canned motorpump and tie up phenomenon, so that continuously safe operation of canned motorpump, this causes the operation of unloading of liquid phase ethylene to be forced to stop.
2, the liquid ethylene temperature that ships of tank car is about-100 ℃, before unloading, for preventing from damaging canned motorpump, canned motorpump and respective line need to be carried out precooling, cooling by the speed that is not more than 28 ℃/hour, (104 ℃) wanted precooling 5 hours at least from normal temperature to the temperature of normally unloading, and could open canned motorpump.The operation of unloading of liquid ethylene belongs to intermittent operation: if whenever unload tank car No. one time, all need precooling in 5 hours, add 2 hours unload the time, can only unload 3 car ethene in one day, can't satisfy the task of unloading of one day 6 car ethene.
3, in the precooling process and after stopping to unload, the liquid ethylene in canned motorpump and the pipeline thereof can flash to gaseous ethene, in order to unload the safety of bassinet structure, can only by being discharged into torch after the safety valve pressure release, lose larger.
4, canned motorpump is forbidden idle running in when operation, otherwise sliding bearing can grind away at short notice, and then impeller and pump case rub, and damage equipment causes potential safety hazard.But the existing bassinet structure that unloads, whether in pipeline have liquid ethylene exist, can't judge at all if unloading for liquid phase.Therefore after unsnatching car at every turn, often owing to manually can't accurately judge the unload remaining quantity of liquid ethylene in the pipeline of liquid phase, cause termination of pumping untimely, canned motorpump dallies, sliding bearing in the canned motorpump sends unusual friction sound because no liquid ethene is lubricated, and very fast (after only unloading 20 car ethene) will cause the damage of canned motorpump.
In sum, the existing operation of unloading of unloading bassinet structure feeding phase ethene brings very large inconvenience, has a strong impact on the normal operation of unloading.
The model utility content
Technical problem to be solved in the utility model provides a kind of low temperature ethylene tank car and unloads bassinet structure, and adopt and originally unload bassinet structure, so that continuously safe operation of canned motorpump, thereby the operation of unloading of guaranteeing liquid phase ethylene is successfully carried out.
For solving the problems of the technologies described above, the utility model provides a kind of low temperature ethylene tank car to unload bassinet structure, its structure is: the liquid phase interface of tank car, the gas phase interface is respectively by the liquid phase pipeline of unloading, the liquid phase import of contrary circulation loop and canned motorpump, contrary loop exit joins, liquid-phase outlet pipeline and the spherical tank of canned motorpump join, the described liquid phase pipeline of unloading comprises the first flexible pipe, the first metal tube, the first metal tube comprises horizontal segment and the vertical section of connection, be provided with the first stop valve between the first flexible pipe and the horizontal segment, horizontal segment is provided with safety valve, the liquid phase interface of the first flexible pipe and tank car joins, the liquid phase import of vertical section and canned motorpump is joined, contrary circulation loop, be respectively equipped with the second stop valve in the liquid-phase outlet pipeline, the 3rd stop valve, the first flexible pipe, the diameter of the first stop valve is 100mm; Liquid phase is unloaded and is connected to contrary loop branches pipeline between pipeline, the contrary circulation loop, one end of contrary loop branches pipeline is on the horizontal segment and between the first stop valve, safety valve, the other end of contrary loop branches pipeline is on contrary circulation loop and between the contrary loop exit of the second stop valve, canned motorpump, be provided with the 4th stop valve in the contrary loop branches pipeline, the height of contrary loop branches pipeline and the 4th stop valve all is lower than contrary circulation loop and the second stop valve.
For the purpose of the concise description problem, below low temperature ethylene tank car described in the utility model is unloaded bassinet structure all referred to as originally unloading bassinet structure.
When unloading, with the first stop valve, the 4th stop valve standard-sized sheet, open the second stop valve to 10～40% of its whole apertures, 1～5% gas ethene in the contrary circulation loop can be discharged into tank car.Cryogenic liquide ethene in the tank car flows to spherical tank by unload pipeline, canned motorpump, liquid-phase outlet pipeline of liquid phase, unloads and operates steadily, and canned motorpump vapour do not occur and ties up phenomenon, finished continuously and unloaded.
After employing was originally unloaded bassinet structure, first, the diameter of the first flexible pipe, the first stop valve was 100mm, and compared with prior art, both diameters have increased one times; Second, the liquid phase pipeline of unloading, be connected to contrary loop branches pipeline between the contrary circulation loop, be provided with the 4th stop valve in the contrary loop branches pipeline, the height of contrary loop branches pipeline and the 4th stop valve all is lower than contrary circulation loop and the second stop valve, like this, can prevent that the gaseous ethene in the non-return circulation loop turns back to the liquid phase import of canned motorpump, and can not allow in the contrary circulation 70～80% liquid ethylene enter tank car, but directly flow in the horizontal segment by contrary loop branches pipeline, the inflow position of described liquid ethylene is between the first stop valve, (namely be positioned at after the first stop valve) between the safety valve.Jointly play a role because of above-mentioned two kinds of architecture advances, so that the flow of the liquid ethylene in the first flexible pipe, the first stop valve reduces to 23～26m
3 / h, flow velocity are reduced to 0.8～1m/s, the flow resistance that liquid ethylene is subject in the first flexible pipe, the first stop valve reduces greatly, effectively prevented the vaporization of liquid ethylene, canned motorpump is difficult for occuring vapour and ties up phenomenon, so that continuously safe operation of canned motorpump, thereby the operation of unloading of guaranteeing liquid phase ethylene is successfully carried out.
Upstream end in the liquid phase import of canned motorpump on the described vertical section is provided with liquid-level switch.
Like this, first, in the process of unloading, liquid-level switch is responded to the liquid phase volume residual of liquid ethylene of unloading in the pipeline, can according to designing requirement, make canned motorpump shift to an earlier date interlock shutdown, guarantee that idle running no longer appears in canned motorpump, avoid the sliding bearing in the canned motorpump to produce the phase mutual friction and send abnormal voice, eliminated the wearing and tearing of sliding bearing, guarantee for a long time safety and steady operation (for a year) of canned motorpump;
Second, after unsnatching car, guarantee on the vertical section quantity of place liquid storage body ethene between liquid-level switch and canned motorpump, the quantity of evaporating because of heat absorption greater than institute's liquid storage body ethene within twice blanking time of unloading in summer, can allow canned motorpump and corresponding pipeline keep low-temperature condition, when consequently unloading, the time of canned motorpump and corresponding pipeline precooling can reduce to 1 hour next time, satisfy the requirement of unloading 6 car ethene in a day, be conducive to unloading continuously of liquid ethylene.
Locate to be connected to reclaim line in the described contrary circulation loop between the contrary loop exit of the second stop valve, canned motorpump, reclaim line and low-pressure vapor phase ethene system connectivity are provided with the 5th stop valve in the reclaim line.
During stopping to unload, high ambient temperature is slowly passed to cryogenic liquide ethene in canned motorpump and the respective line with heat, and it is ceaselessly gasified, and pressure raises gradually.By reclaim line and the 5th stop valve, the gas ethene in canned motorpump and the respective line all can be recovered to low-pressure vapor phase ethene system, reduced the ethene waste, saved cost of production.According to test, can save per month 10 tons of ethene, amount to about 100,000 yuans.
In sum, originally unload the obstacle that bassinet structure has been eliminated affects the normal operation of canned motorpump, the process of unloading of liquid ethylene can successfully be carried out safely, for continuous operation of follow-up each device provides guarantee, invest littlely, effect is remarkable.
Description of drawings
Fig. 1 is the structural representation that originally unloads bassinet structure.
Embodiment
Below can further be well understood to the utility model by mode of execution given below.But they are not to restriction of the present utility model.
Referring to Fig. 1, the structure of originally unloading bassinet structure is:
The liquid phase interface of tank car 1, gas phase interface respectively by liquid phase unload pipeline, contrary circulation loop and canned motorpump 6 the liquid phase import, join against loop exit.
The liquid phase pipeline of unloading comprises the first flexible pipe 2a, the first metal tube 2c, the first metal tube 2c comprises horizontal segment 2d and the vertical section 2e of connection, be provided with the first stop valve 2b between the first flexible pipe 2a and the horizontal segment 2d, horizontal segment 2d is provided with safety valve 4, the liquid phase interface of the first flexible pipe 2a and tank car 1 joins, the liquid phase import of vertical section 2e and canned motorpump 6 is joined, and the upstream end that vertical section 2e goes up in the liquid phase import of canned motorpump 6 is provided with liquid-level switch 5.The diameter of the first flexible pipe 2a, the first stop valve 2b, the first metal tube 2c is 100mm.
Contrary circulation loop is formed by the second flexible pipe 9a, the second stop valve 9b, the second metal tube 9c connection, like this, is provided with the second stop valve 9b in the contrary circulation loop.
Liquid-phase outlet pipeline 7a and the spherical tank 8 of canned motorpump 6 join, and are provided with the 3rd stop valve 7b among the liquid-phase outlet pipeline 7a.
(being that liquid phase is unloaded between pipeline, the contrary circulation loop) is connected to contrary loop branches pipeline 3a between horizontal segment 2d, the second metal tube 9c.The lower end of contrary loop branches pipeline 3a is on the horizontal segment 2d and between the first stop valve 2b, safety valve 4, the upper end of contrary loop branches pipeline 3a is on the second metal tube 9c and between the contrary loop exit of the second stop valve 9b, canned motorpump 6, be provided with the 4th stop valve 3b among the contrary loop branches pipeline 3a, the height of contrary loop branches pipeline 3a and the 4th stop valve 3b all is lower than contrary circulation loop and the second stop valve 9b, can not turn back to the liquid phase import of canned motorpump 6 to guarantee the gas ethene in the contrary circulation loop.
The second metal tube 9c upper (namely locating between the contrary loop exit of the second stop valve 9b, canned motorpump 6 in the contrary circulation loop) is connected to reclaim line 10b, and reclaim line 10b is communicated with low-pressure vapor phase ethene system 11, is provided with the 5th stop valve 10a among the reclaim line 10b.
When unloading, with the first stop valve 2b, the 4th stop valve 3b standard-sized sheet, open the second stop valve 9b to 10%～40% of its whole apertures, be used for exhausting air ethene, cryogenic liquide ethene in the tank car 1 flows to spherical tank 8 by the first flexible pipe 2a, the first stop valve 2b, the first metal tube 2c, canned motorpump 6, liquid-phase outlet pipeline 7a, unload and operate steadily, canned motorpump 6 vapour do not occur and tied up phenomenon, finished continuously and unloaded.
Above-described only is a kind of mode of execution of the present utility model.Should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model principle, can also make some modification and improvement, these also should be considered as belonging to protection domain of the present utility model.
Claims (3)
1. the low temperature ethylene tank car unloads bassinet structure, the liquid phase interface of tank car, the gas phase interface is respectively by the liquid phase pipeline of unloading, the liquid phase import of contrary circulation loop and canned motorpump, contrary loop exit joins, liquid-phase outlet pipeline and the spherical tank of canned motorpump join, the described liquid phase pipeline of unloading comprises the first flexible pipe, the first metal tube, the first metal tube comprises horizontal segment and the vertical section of connection, be provided with the first stop valve between the first flexible pipe and the horizontal segment, horizontal segment is provided with safety valve, the liquid phase interface of the first flexible pipe and tank car joins, the liquid phase import of vertical section and canned motorpump is joined, contrary circulation loop, be respectively equipped with the second stop valve in the liquid-phase outlet pipeline, the 3rd stop valve is characterized in that: the first flexible pipe, the diameter of the first stop valve is 100mm; Liquid phase is unloaded and is connected to contrary loop branches pipeline between pipeline, the contrary circulation loop, one end of contrary loop branches pipeline is on the horizontal segment and between the first stop valve, safety valve, the other end of contrary loop branches pipeline is on contrary circulation loop and between the contrary loop exit of the second stop valve, canned motorpump, be provided with the 4th stop valve in the contrary loop branches pipeline, the height of contrary loop branches pipeline and the 4th stop valve all is lower than contrary circulation loop and the second stop valve.
2. low temperature ethylene tank car according to claim 1 unloads bassinet structure, it is characterized in that: the upstream end in the liquid phase import of canned motorpump on the described vertical section is provided with liquid-level switch.
3. low temperature ethylene tank car according to claim 1 and 2 unloads bassinet structure, it is characterized in that: between the contrary loop exit of the second stop valve, canned motorpump, locate to be connected to reclaim line in the described contrary circulation loop, reclaim line and low-pressure vapor phase ethene system connectivity are provided with the 5th stop valve in the reclaim line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220318060 CN202660241U (en) | 2012-07-03 | 2012-07-03 | Unloading structure of low-temperature ethylene tank car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220318060 CN202660241U (en) | 2012-07-03 | 2012-07-03 | Unloading structure of low-temperature ethylene tank car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202660241U true CN202660241U (en) | 2013-01-09 |
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ID=47455150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220318060 Expired - Lifetime CN202660241U (en) | 2012-07-03 | 2012-07-03 | Unloading structure of low-temperature ethylene tank car |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202660241U (en) |
Cited By (1)
| 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 |
-
2012
- 2012-07-03 CN CN 201220318060 patent/CN202660241U/en not_active Expired - Lifetime
Cited By (1)
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130109 |
|
| CX01 | Expiry of patent term |