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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 propane precooling deethanizer, can solve the problems of large floor space, poor applicability, complicated process, etc., and achieves compact equipment and increased Recovery rate, effect of simple equipment

Inactive Publication Date: 2014-06-18
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

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  • Heavy hydrocarbon recovery method of propane precooling and deethanizer top reflux
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  • 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 accompanying drawings and embodiments.

[0022] Such as figure 1As shown, assuming that the pressure of the pretreated natural gas is 7.14MPa and the temperature is 36.0°C, the process consists of a propane precooling cycle and a natural gas deheavy hydrocarbon process.

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

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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, adopting the design of gas-phase reflux at the top of a deethanizer tower, combined with propane precooling and natural gas self-expansion technology to remove heavy components in high-pressure natural gas. Adopting this recovery process not only improves the recovery rate of propane, but also avoids excessive fuel gas generation and waste. At the same time, the process equipment is simple and has high economy, which is very suitable for the removal of heavy hydrocarbons in FPSO high-pressure natural gas. Background technique: [0002] my country has proved to be rich in 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, traditional offshore platforms and seabed relationships will be limited by ...

Claims

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Application Information

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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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