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Control method of compressor unit, compressor unit and multiple compression sections

A technology of a compressor unit and a control method, which is applied to the control of the compressor unit, the compressor unit and the fields of multiple compression sections, can solve the problem of not being able to suppress the increase in the load of the compression section and the like

Active Publication Date: 2020-09-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the case of the conventional technique as described above, even if the pressure on the discharge side of the compression stage is controlled so that the pressure does not increase excessively, the increase in the load in the compression stage cannot be suppressed in some cases.

Method used

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  • Control method of compressor unit, compressor unit and multiple compression sections
  • Control method of compressor unit, compressor unit and multiple compression sections
  • Control method of compressor unit, compressor unit and multiple compression sections

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Experimental program
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Embodiment Construction

[0016] figure 1 is a schematic flow diagram of the compressor unit 100 . refer to figure 1 The compressor unit 100 will be described.

[0017] The compressor unit 100 is installed in a ship (not shown) having an LNG storage tank 101 storing LNG (Liquified Natural Gas: liquefied natural gas). The compressor unit 100 sucks target gas which is boil off gas generated in the LNG storage tank 101, and compresses the sucked target gas. Specifically, the compressor unit 100 boosts the target gas to about 300 barG (30 MPaG), and supplies the boosted target gas to a designated customer. In the following description, the terms "upstream" and "downstream" are used based on the flow direction of the target gas.

[0018] The compressor unit 100 is a reciprocating compression mechanism, and has: a flow path 110 through which the target gas flows toward the demand side; a plurality of compression stages 201 to 205 for sequentially increasing the pressure of the target gas; a plurality of ...

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PUM

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Abstract

The invention provides a control method of a compressor unit, a compressor unit and multiple compression sections. The control method is a method for controlling a compressor unit that is installed ina ship and compresses a target gas, which is boil-off gas drawn in from a liquefied natural gas storage tank of the ship. According to the control method, a bypass valve is opened, and the target gasis returned to a storage tank connection flow path via a bypass pipeline when it is determined that the target gas in the storage tank connection flow path connected to the liquefied natural gas storage tank is in a specified low-pressure state, when the compressor unit is driven. Accordingly, even if the amount of generated target gas is small, the load of the compression section of the compressor unit is not excessively increased, and the target gas can be supplied to a consumer.

Description

technical field [0001] The present invention relates to a control method for supplying target gas as boil-off gas from an LNG storage tank of a ship to a compressor unit on a demand side, a compressor unit, and a plurality of compression stages for the compressor unit. Background technique [0002] Conventionally, a compressor unit has been developed that boosts the boil-off gas generated from LNG (Liquified Natural Gas: liquefied natural gas) (hereinafter referred to as "target gas") and supplies it to consumers such as engines and generators (see Japanese Patent Publication No. 6371930 No., Japanese Patent Publication Publication Special Table No. 2011-517749 and Japanese Patent Laid-Open Publication No. 2018-128038). In order to prevent the pressure on the discharge side of the compression section of the compressor unit from becoming too high, the compressor unit has a bypass line for returning the target gas to the upstream (refer to Japanese Patent Publication No. 63719...

Claims

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Application Information

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IPC IPC(8): F17C7/04F17C13/04F17C13/02
CPCF17C7/04F17C13/04F17C13/025F17C2201/0104F17C2221/033F17C2223/0161F17C2225/0161F17C2227/0164F17C2205/0352F17C2205/0388F17C2227/0337F17C2250/043F17C2250/0689F17C2225/036F17C2260/02F17C2270/0105Y02T10/30Y02T70/5218F04B49/24B63B25/16B63H21/38F17C2265/037F17C2227/0185F17C2265/05B63H21/12B63H21/14F02B63/04
Inventor 手塚智志濑山胜广
Owner KOBE STEEL LTD