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Control device of natural gas ethane recovery device and using method

A recovery device and control device technology, applied in the controller, measuring device, electric controller, etc. with specific characteristics, can solve the problem that the natural gas ethane recovery device cannot operate safely and smoothly, achieve stable system pressure and avoid repeated fluctuations Effect

Pending Publication Date: 2020-08-28
XIAN CHANGQING TECH ENG +1
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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 provide a control device and usage method of a natural gas ethane recovery device to solve the problem that the natural gas ethane recovery device cannot operate safely and smoothly in the prior art

Method used

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  • Control device of natural gas ethane recovery device and using method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a control device for a natural gas ethane recovery device includes multiple rows of natural gas ethane recovery devices, and each row of natural gas ethane recovery devices includes a demethanizer 1, an expander expansion end 2, an expander booster end 3, The centrifugal compressor 4, the first controller 8, the second controller 9, the third controller 10, the fourth controller 11 and the expander controller 12, the expansion end 2 input end of the expander is connected with the expansion end intake pipeline, A flow detector 5 and a first pressure detector 6 are also connected to the inlet pipeline of the expansion end, the output port of the expansion end 2 of the expander is connected to the input port of the demethanizer 1 through the output pipeline of the expansion end, and the output pipeline of the expansion end is also connected with The third pressure detector 14, the output end of the demethanizer 1 is connected to the input port of...

Embodiment 2

[0036] Such as figure 1As shown, on the basis of Example 1, a branch line is connected to the input port of the demethanizer 1 on the inlet pipeline of the expansion end, and a JT valve 17 is also connected to the branch line, and the JT valve 17 and the first controller 8 electrical signal connections.

[0037] The branch line of the inlet pipeline at the expansion end is directly connected to the input port of the demethanizer 1, and the branch line is connected to the JT valve 17, which is used to transmit gas through the branch line when the expander fails. The JT valve 17 is connected to the first controller 8 for electrical signals.

[0038] It also includes a cold box 16 through which the output line of the demethanizer passes.

[0039] The natural gas ethane recovery device also includes a cold box 16, and the output pipeline of the demethanizer passes through the cold box 16 to cool down the gas in the pipeline.

[0040] The natural gas ethane recovery device has fo...

Embodiment 3

[0043] Such as figure 1 Shown, on the basis of embodiment 2, a kind of control device using method of natural gas ethane recovery device comprises the following steps:

[0044] In the first step, the flow detector and the first pressure detector are selected, and the first controller 8 of each column of natural gas ethane recovery device is controlled by the third controller 10, so that the first controller 8 of any three columns adopts the flow rate Detector 5 signals, and the first controller 8 of the remaining row adopts the first pressure detector 6 signals to control the speed of each row of expanders;

[0045] When the flow detector 5 is used as the feedback, the normal value of the flow is set as F0, the flow at the inlet measured by the flow detector 5 is FC, the first controller 8 adopts the classic PID algorithm, and controls the flow according to the flow deviation between FC and F0. The opening of the guide vane valve 13 is used to control the speed of the expande...

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Abstract

The invention discloses a control device of a natural gas ethane recovery device and a using method. The control device comprises multiple columns of natural gas ethane recovery devices, each column of natural gas ethane recovery device comprises a demethanizer, an expansion end of an expansion machine, a pressurization end of the expansion machine, a centrifugal compressor, a first controller, asecond controller, a third controller, a fourth controller and an expansion machine controller. The expansion end input end of the expansion machine is connected with an expansion end air inlet pipeline; a flow detector and a first pressure detector are further connected to the expansion end air inlet pipeline. An expansion end output port of the expansion machine is connected to an input port ofthe demethanizer through the expansion end output pipeline, and the expansion end output pipeline is further connected with a third pressure detector. By means of the expansion machine-JT valve control method, stable operation of the multi-column natural gas ethane recovery device is achieved, and frequent fluctuation of the device pressure is avoided.

Description

technical field [0001] The invention belongs to the field of natural gas processing, and in particular relates to a control device and a use method of a natural gas ethane recovery device. Background technique [0002] The task of the natural gas ethane recovery device is to reduce the temperature of natural gas through expansion or refrigerant refrigeration, and to separate ethane (C2), propane (C3) and the above components at low temperature. The combined refrigeration method of expansion refrigeration and refrigerant refrigeration is often used . [0003] At present, the processing capacity of domestic natural gas dehydrogenation equipment is small, generally less than 2 million cubic meters per day, and only propane (C3) and above components are recovered, and ethane (C2) is not recovered. A natural gas dehydrogenation treatment plant has at most 1 or 2 column fixtures. The control strategy of the expansion refrigeration of the dehydrogenation unit is: when the single-...

Claims

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Application Information

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IPC IPC(8): C07C9/06C07C9/00C07C7/00G01D21/02G05B11/42
CPCC07C7/005G05B11/42G01D21/02C07C9/06C07C9/00
Inventor 任晓峰杨充常志波左晨刘子兵张鑫邱鹏李卫刘元刚
Owner XIAN CHANGQING TECH ENG
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