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Heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux

A deethanizer and propane precooling technology, which is applied in the field of heavy hydrocarbon recovery in the overhead reflux of the propane precooling deethanizer, can solve the problems of large floor space, poor applicability, and difficult installation, and achieves compact equipment and increased Recovery rate, quick start and stop effect

Inactive Publication Date: 2015-07-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

On the other hand, the process flow on land is complicated, it occupies a large area, and it is not easy to install, so it has poor applicability at sea.
Therefore, the existing heavy hydrocarbon recovery process used on land generally cannot be directly used in LNG-FPSO, and a new process suitable for marine environment needs to be studied

Method used

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  • Heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux
  • Heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux
  • Heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Such as figure 1 As shown, it is assumed that the pressure of natural gas after pretreatment is 7.14 MPa and the temperature is 36.0°C. The process consists of a propane pre-cooling cycle and a natural gas de-heavy hydrocarbon process.

[0023] In the propane pre-cooling cold box unit, three-stage pre-cooling is used. Propane is first separated into gas-liquid two-phase by high-pressure separator 30. The gas phase is mixed with the gas compressed by propane compressor Ⅱ47 and flows into propane compressor Ⅲ50, compressed to a temperature of 52.2℃ and pressure of 1.36MPa, and then passes through the fourth water cooler When 51 is cooled to 31°C, all propane is liquefied, and the pressure is reduced to 0.55MPa through the propane throttle valve 53, and the temperature is reduced to 5°C, mixed with propane reheated from the cold box, and then flows into the high-pres...

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Abstract

The invention provides a heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux and belongs to the technical field of chemical engineering and low temperatures. The heavy hydrocarbon recovery method is designed modularly, and a liquefaction process is composed of propane precooling circulation, deethanizer top product reflux gas-liquid separation, gas-liquid separation of natural gas and natural gas heavy hydrocarbon removal, wherein the propane circulation is used for precooling a natural gas, the LPG (Liquefied Petroleum Gas), a nitrogen gas refrigerant and a deethanizer top product reflux material flow, the deethanizer top product is returned to a precooling cold box and further cooled and recycled, and the deethanizer top product does not go through gas-liquid separation after being cooled. A liquid phase obtained by virtue of the gas-liquid separation of the natural gas is returned to the precooling cold box to intensify the cooling capacity, and the process is added with a reflux part. The heavy hydrocarbon recovery method is applicable to heavy hydrocarbon recovery of the offshore liquefied petroleum gas, and the yield of the heavy hydrocarbon and the yield of the LPG both are high.

Description

Technical field: [0001] The invention relates to a method for recovering heavy hydrocarbons in high-pressure natural gas on FPSO, in particular, adopts the design of gas phase reflux at the top of a de-ethanizer, and combines propane pre-cooling and natural gas self-expansion processes to remove heavy components in high-pressure natural gas. Adopting this kind of recovery process not only improves the recovery rate of propane, but also avoids the production of excessive fuel gas and causes waste. At the same time, the process equipment is simple, has high economy, and is very suitable for the removal of heavy hydrocarbons in FPSO high-pressure natural gas. Background technique: [0002] my country has proven abundant offshore natural gas resources, and the processing of deep-sea gas fields, marginal gas fields and low-grade natural gas resources is considerable. For the exploitation of such gas sources, the use of traditional offshore platforms and submarine relations will be li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10C10G5/06F25J3/08C07C9/08C07C7/00
Inventor 李玉星王武昌胡其会王清朱建鲁盛欢欢
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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