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Pressure-stabilizing and constant-flow control system and method for LNG multi-immersed-pump marine filling sledge

A technology of constant flow control and submersible pump, which is applied in the pipeline system, container filling method, container discharge method, etc., can solve the problems of large measurement error of back-end flowmeter and unbalanced outlet pressure, and achieves the guarantee of safety, The effect of improving filling efficiency

Active Publication Date: 2021-06-15
HOPE CLEAN ENERGY (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems mentioned above, to provide a system and method for controlling the constant pressure and constant flow of LNG multi-submersible pump marine filling skid. Balance, the problem of large measurement error of the back-end flowmeter; by proposing a new control method, multiple pumps operate independently, and the way of summarizing the filling can not only meet the large filling volume, but also provide a spare pipeline. Based on this Up-regulate the corresponding pipeline to achieve long-lasting, stable and accurate filling

Method used

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  • Pressure-stabilizing and constant-flow control system and method for LNG multi-immersed-pump marine filling sledge
  • Pressure-stabilizing and constant-flow control system and method for LNG multi-immersed-pump marine filling sledge

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Embodiment 1

[0034] Such as Figure 1~2 As shown, a LNG multi-submersible pump marine filling skid regulator constant current control system, including station control system, tank 1, submersible pump 2, filling valve 3 and metering system 4; the submersible pump 2 They are separately communicated with the tank 1 to form a plurality of independent filling pipelines, and the multiple independent filling pipelines are confluent at the metering system 4, and the station control system is connected with the submersible pump 2 respectively, and the station control system The control system controls the output pressure of the submersible pump 2 respectively, so that the pressures at the confluence of each filling pipeline are balanced; On-off control of the road.

[0035] A liquid inlet valve 5 and an air return valve 6 are arranged between the submersible pump 2 and the tank 1. The submersible pump is also equipped with a frequency converter, and the submersible pump is completed through the l...

Embodiment 2

[0045] This embodiment provides a method for controlling constant pressure and constant flow of LNG multi-submersible pump 2 marine filling skids; this embodiment takes four submersible pumps 2 as an embodiment;

[0046] First, select one of the four submersible pumps 2 as the standby pump through the station control system, and then select the other one as the priority pump, and turn on all the submersible pumps 2 to enable the entire system to enter the automatic state. At this time, The PLC controls to open the liquid inlet valve 5 and the air return valve 6 of each submersible pump 2, and fill the LNG in the tank 1 into the submersible pump 2, so that each submersible pump 2 enters a pre-cooling state, and is ready for filling;

[0047] The LNG filling metering system 4 sends a filling request to the PLC, and the PLC detects the temperature of the pump pool through the temperature detection components 9 of each submersible pump 2, and judges whether the precooling of the pu...

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Abstract

The invention discloses a pressure-stabilizing and constant-flow control system and method for an LNG multi-immersed-pump marine filling sledge. The system comprises a plurality of independent filling pipelines, each filling pipeline comprises an independent immersed pump, and the filling pipelines are converged at tail ends; and pressure detection assemblies are arranged on the filling pipelines and a confluence pipeline, each filling pipeline comprises a filling valve, during use, the filling valves are closed, the immersed pumps are started at the same time, and when the pressure value on the filling pipelines reaches a preset value, the filling valves are started, so that the multiple filling pipelines are converged into the confluence pipeline. According to the system and the method, stable and efficient LNG input can be conducted on a ship through the multiple filling pipelines at the same time, the input power can be adjusted in real time according to the magnitude of the ship, the multi-pump independent operation and summarized filling mode is achieved, the large filling amount can be met, standby pipelines can be provided, the corresponding pipelines are adjusted on the basis, and lasting, stable and accurate filling is realized.

Description

technical field [0001] The invention relates to the field of LNG marine filling, in particular to an LNG multi-submersible pump marine filling skid control system and method for voltage stabilization and constant current. Background technique [0002] Annex VI of the International Convention for the Prevention of Pollution from Ships (MARPOL) promulgated by the International Maritime Organization (IMO) will gradually implement stricter NOx and SOx emission requirements for the global and emission control areas. Traditional ships use diesel as the main fuel, and the cost of limiting NOx and SOx emissions is high and the effect is limited. According to statistics, compared with traditional fuel ships, LNG fueled ships can reduce their emissions of sulfur oxides, nitrogen oxides and particulate matter by 90%, respectively. 80% and more than 90% are the most realistic and feasible among various green solutions. The government has also adopted a series of vigorous promotion and e...

Claims

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Application Information

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IPC IPC(8): F17C6/00F17C13/00F17C13/02F17C13/04F17D1/08F17D1/14F17D3/01F17D3/18
CPCF17C6/00F17C13/00F17C13/02F17C13/025F17C13/026F17C13/04F17D1/082F17D1/14F17D3/01F17D3/18F17C2205/0302F17C2221/033F17C2227/0135F17C2227/0185F17C2227/041F17C2250/043F17C2250/0439F17C2250/0404F17C2250/072F17C2260/025F17C2265/066F17C2270/0105
Inventor 吴潇陈毅李强汪昊张敏杨顺之李超谭贤财
Owner HOPE CLEAN ENERGY (GRP) CO LTD
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