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Liquefaction apparatus

A liquefaction device and electric power technology, applied in liquefaction, refrigeration, liquefaction, solidification, etc., can solve problems such as fines

Pending Publication Date: 2021-07-23
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, commercial power is determined in advance by contracts with power companies, etc. If you do not comply with the contract, you will be fined heavily

Method used

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  • Liquefaction apparatus
  • Liquefaction apparatus

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Embodiment approach 1

[0048] use figure 1 The liquefaction unit 1 and the air separation unit 2 according to Embodiment 1 will be described.

[0049] The liquefaction unit 1 is provided with a nitrogen gas introduction pipe L1 from the air separation unit 2, a compressor 3 for compressing nitrogen gas, a heat exchanger 6 for cooling and liquefying the compressed nitrogen gas compressed by the compressor 3 by the cold of an LNG cold source 7, and converting the compressed nitrogen gas compressed by the A pipe L4 from which a part of the compressed nitrogen gas cooled to an intermediate temperature in the exchanger 6 is branched and led out, an expansion turbine 4 installed in the pipe L4 to expand the compressed nitrogen gas to generate cooling, and the nitrogen gas expanded by the expansion turbine 4 is used as a nitrogen cooling source And the pipe L5 leading to the heat exchanger 6 and converging to the suction side of the compressor 3 after temperature rise, the gas-liquid separator 13 , the lea...

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Abstract

The invention provides a liquefaction apparatus which automatically adjusts the load on the liquefaction apparatus correspondingly with an upper limit value of contracted power in different time slots, and which is capable of maximizing the amount of liquefied product produced and of achieving optimum operating efficiency. A liquefaction apparatus 1 comprises: a production amount calculation unit 91 for obtaining an actual production amount of a liquefied product; a predicted power calculation unit 92 for obtaining a predicted power amount after a predetermined time (e.g., 10-40 minutes) has elapsed, on the basis of an integrated power value obtained by integrating a usage power; anda power demand control unit 93 for comparing the predicted power amount and a moving average of instantaneous power, and controlling a discharge flow rate of a compressor 3 in such a way as to come infinitely close to a target value, without exceeding the target value, and while using the larger value of the predicted power amount and the moving average of instantaneous power as a value being controlled.

Description

technical field [0001] The present invention relates to a liquefaction device for liquefying nitrogen produced by an air separation device. Background technique [0002] Patent Document 1 discloses a method of utilizing liquefied natural gas through a liquefaction process including one or more compressors for gas, one or more expansion turbines for gas, and a heat exchanger for exchanging heat between gas and liquefied natural gas. cold to liquefy the gas. In Patent Document 1, the expansion turbine is stopped or operated at a reduced rate when the supplied LNG is increased, and the expansion turbine is activated or operated at an increased rate when the supplied LNG is decreased. [0003] When it is desired to increase or decrease the production amount of liquefied products, the load of the compressor is varied. Electric power is required to drive the compressor. Normally, the amount of electric power used by the compressor is constant due to quantitative operation. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0228F25J1/0252F25J1/0254F25J2210/42F25J1/0015F25J1/0037F25J1/0234F25J1/004F25J1/0245F25J1/0224F25J3/04393F25J3/04412F25J2230/24F25J2230/42F25J1/0221
Inventor 金田拓也
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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