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Unloading system and unloading method of easy-to-vaporize liquid tank car

A technology for vaporizing liquids and tank cars, which is applied in the field of unloading systems for easy-to-vaporize liquid tank cars. It can solve problems such as low efficiency, pulse vibration of transmission pipelines, and impact on service life, and achieve high efficiency.

Pending Publication Date: 2021-01-22
LIHUAYI WEIYUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current unloading method for easily vaporized liquids (such as propylene) is generally to unload directly through a centrifugal pump or a sliding vane pump connected in series at the outlet of the tank car. However, because this type of liquid is very easy to vaporize, long-term operation of the centrifugal pump under cavitation conditions will seriously affect Its service life, low efficiency, unsafe
Although the sliding vane pump does not have the cavitation phenomenon of the centrifugal pump, because it is a positive displacement pump, it is very likely to cause inlet vaporization and outlet pulse phenomenon, the pump load is unstable, the service life is short, and the long-distance transportation may also make the transportation Pulse vibration occurs in the pipeline, and the unloading efficiency is low, the speed is slow, and the safety is also not guaranteed

Method used

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  • Unloading system and unloading method of easy-to-vaporize liquid tank car

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 As shown, a tank car unloading system for easily vaporized liquid includes multiple tank car units, a liquid storage tank 6, four compressors 11, a vapor-liquid separation tank 9, a punching line 19, an equalizing line 20, and a pumping line 18. Go to the torch line 22.

[0030] Each tank car unit includes a tank car 1, an unloading crane position 2 and a four-position four-way valve 3. The unloading crane position 2 is connected to the gas phase interface of the tank car 1 through the gas phase crane pipe 4, and the unloading crane position 2 is connected to the gas phase interface of the tank car 1 through the liquid phase The crane pipe 5 is connected to the liquid phase interface of the tank car 1. The four-position four-way valve 3 includes an open position of B-F, an open position of C-G, an open position of D-H and a closed position of A-E. The four-position four-way valve H port, G port, F Both ports are connected to the unloading crane position 2...

Embodiment 2

[0040] like figure 1 Shown, a kind of unloading method of easily vaporized liquid tank car unloading system comprises the following steps:

[0041] Step 1, firstly purging and cleaning the pipeline, valve and vapor-liquid separation tank 9, filling the gas phase of the liquid with other pipelines except the liquid phase pipeline 7 by venting or replacing, so that the liquid phase is filled with the liquid phase pipeline 7;

[0042] Open each valve on the gas phase crane tube 4, the liquid phase crane tube 5, the first gas phase line 8 and the second gas phase line 10, open the liquid phase pipeline 7 first valve 25 and the second valve 26, and the first remote pressure transmission The valve of the first branch line 12 at the inlet of the compressor 11 electrically connected to the device 23 is opened, the valve of the third branch line 15 at the outlet is opened, and the remaining valves are closed;

[0043] Step 2: start the compressor 11 electrically connected to the first...

Embodiment 3

[0051] like figure 1 Shown, the unloading method of a kind of easily vaporized liquid tank car unloading system, differs from embodiment 2 in that:

[0052] Step 1, firstly purging and cleaning the pipeline, valve and vapor-liquid separation tank 9, filling the gas phase of the liquid with other pipelines except the liquid phase pipeline 7 by venting or replacing, so that the liquid phase is filled with the liquid phase pipeline 7;

[0053] When the material in the tank car 1 needs to be transported over a long distance, open the valves on the gas phase crane pipe 4, the liquid phase crane pipe 5, the first gas phase line 8 and the second gas phase line 10, and open the first valve 25 of the liquid phase pipeline 7, The third valve 27, the pipeline pump 28 and the fourth valve 29 open the valve of the first branch line 12 at the inlet of the compressor 11 electrically connected to the first remote pressure transmitter 23, open the valve of the third branch line 15 at the outle...

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Abstract

The invention discloses an unloading system and unloading method of an easy-to-vaporize liquid tank car. The unloading system comprises a plurality of tank car units, a liquid storage tank and a plurality of compressors, wherein liquid phase ports of the plurality of tank car units are connected with a liquid phase port of the liquid storage tank through liquid phase pipelines, a gas phase port ofthe liquid storage tank is connected with gas phase ports of the plurality of tank car units through a gas phase pipeline assembly, and the plurality of compressors are arranged on the gas phase pipeline assembly. By stamping the tank car, a liquid material in the tank car is automatically output into the liquid storage tank, and the problem that at present, a centrifugal pump or a sliding vane pump is used for directly unloading at an outlet of the tank car is solved; and in addition, a plurality of tank cars can be unloaded at the same time, the plurality of compressors can be freely switched between a standby state and a working state (stamping or pressure pumping), and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of liquid truck unloading, in particular to a truck unloading system and method for easily vaporized liquid tank trucks. Background technique [0002] The current unloading method for easily vaporized liquids (such as propylene) is generally directly unloaded through a centrifugal pump or a sliding vane pump connected in series at the outlet of the tank car. However, because this type of liquid is very easy to vaporize, long-term operation of the centrifugal pump under cavitation conditions will seriously affect Its service life, efficiency is low, unsafe. Although the sliding vane pump does not have the cavitation phenomenon of the centrifugal pump, but because it is a positive displacement pump, it is very likely to cause inlet vaporization and outlet pulse phenomenon, the pump load is unstable, the service life is short, and the transportation may be damaged during long-distance transportation. Pulse vib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/02F17C13/00F17C13/02F17C13/04
CPCF17C7/02F17C13/002F17C13/025F17C13/04F17C2223/013F17C2227/0157F17C2227/04
Inventor 张玉良马晓闫卫林王磊刘国柱李新强王丙庚李立民门文清卢新海
Owner LIHUAYI WEIYUAN CHEM CO LTD
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