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Apparatus and method for optimizing a natural gas liquefaction train having a nitrogen cooling loop

A cooling circuit, liquefied natural gas technology, applied in the operation field of natural gas liquefaction system, can solve the problems of money loss, production loss and so on

Inactive Publication Date: 2011-03-16
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such manual controls are often sub-optimal, resulting in lost yields and corresponding monetary losses

Method used

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  • Apparatus and method for optimizing a natural gas liquefaction train having a nitrogen cooling loop
  • Apparatus and method for optimizing a natural gas liquefaction train having a nitrogen cooling loop
  • Apparatus and method for optimizing a natural gas liquefaction train having a nitrogen cooling loop

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Embodiment Construction

[0017] figure 1 An exemplary natural gas liquefaction system 100 in accordance with the present invention is shown. figure 1 The illustrated embodiment of the natural gas liquefaction system 100 is for illustration only. Other embodiments of the natural gas liquefaction system 100 may also be used without departing from the scope of the present invention.

[0018] In this exemplary embodiment, the natural gas liquefaction system 100 includes equipment for processing methane-rich feed gas (natural gas) to produce liquefied natural gas (LNG). figure 1 The equipment shown represents one possible implementation of a natural gas liquefaction system. Other types of natural gas liquefaction systems or equipment with other or additional equipment or equipment with different configurations can also be used.

[0019] In this example, the natural gas liquefaction system 100 includes a main heat exchanger 102 having a warm end 104, a cold end 106, and an intermediate point 108. The walls of t...

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Abstract

A natural gas liquefaction train (100, 100a-100n) includes a nitrogen cooling loop. A controller (208a-208n, 300) is provided for controlling one or more controlled variables by adjusting one or more manipulated variables. The one or more manipulated variables may include a nitrogen flow associated with the nitrogen cooling loop in the natural gas liquefaction train. The controller could adjust the nitrogen flow by adjusting operation of a compressor (178) associated with the nitrogen cooling loop. The one or more controlled variables may include a rundown temperature of liquefied natural gas exiting the nitrogen loop and / or a calorific or heating value of the liquefied natural gas exiting the nitrogen loop. A second controller (206a-206n) could control other aspects of the natural gas liquefaction train, such as by controlling a mass flow rate of a feed gas in the natural gas liquefaction train.

Description

Technical field [0001] The present invention relates generally to control systems, and more specifically to an apparatus and method for optimizing the operation of a natural gas liquefaction system (train) with a nitrogen cooling circuit. Background technique [0002] Liquefied natural gas plants typically convert feed gas into liquefied natural gas (LNG). For example, an LNG facility may include a device that cools natural gas feedstock to produce LNG. Liquefied natural gas occupies much less space than natural gas, allowing more economical natural gas transportation. Due to various factors, such as a large number of process variables that affect equipment operation, it is often difficult to control LNG equipment. Human operators can periodically adjust the key operating variables of LNG equipment. However, this manual control is usually sub-optimal, resulting in loss of output and corresponding monetary loss. Summary of the invention [0003] The present invention provides a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0268F25J1/0022F25J1/0072F25J1/0249F25J1/0087F25J1/0218G05B13/048F25J1/0055F25J2220/62F25J1/0252G05D7/0676F25J1/0269F25J1/0292F25J2270/12F25J2270/60
Inventor B·A·考尔德
Owner HONEYWELL INT INC