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A device and a method for improving start-up operation of a demethanizer of an ethylene device

A demethanizer and conveying device technology, applied in the field of ethylene production equipment, can solve the problems of high temperature at the top of the demethanizer and insufficient cooling capacity of process materials, etc., and achieve the effect of increasing the pushing force, reducing losses and stabilizing operation

Active Publication Date: 2019-06-11
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the cooling capacity of process materials is insufficient, and the temperature at the top of the demethanizer is higher than the design value

Method used

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  • A device and a method for improving start-up operation of a demethanizer of an ethylene device
  • A device and a method for improving start-up operation of a demethanizer of an ethylene device

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Embodiment

[0024] In this embodiment, the process flow diagram of the refrigerant delivery device used for the start-up of the demethanizer of the ethylene plant is as follows figure 2 shown.

[0025] The refrigerant delivery device includes a medium-temperature suction tank, a high-temperature suction tank, a refrigerant delivery line, a refrigerant liquid-phase driving force line and a refrigerant gas-phase driving force line, and the bottom of the medium-temperature suction tank passes through the refrigerant delivery line Connected to the demethanizer overhead condenser, the tank bottom of the high-temperature suction tank is connected to the refrigerant delivery line through the refrigerant liquid-phase driving force line, and the tank top of the medium-temperature suction tank is connected to the refrigerant gas-phase driving force line through the refrigerant gas phase. agent delivery line; the refrigerant delivery line is provided with a throttling expansion valve, and the refri...

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PUM

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Abstract

The invention belongs to the field of ethylene production devices, and relates to a device and a method for improving start-up operation of a demethanizer of an ethylene device. The refrigerant conveying device comprises a medium-temperature suction tank, a high-temperature suction tank, a refrigerant pipeline and a refrigerant liquid-phase pushing force pipeline, the tank bottom of the medium-temperature suction tank is connected to a demethanizer overhead condenser through the refrigerant pipeline, and the tank bottom of the high-temperature suction tank is connected to the refrigerant pipeline through the refrigerant liquid-phase pushing force pipeline. By utilizing the ethylene refrigerant pipeline additionally arranged in front of the demethanizer overhead condenser, the pushing forceof the ethylene refrigerant of the demethanizer is increased, so that the operation of the demethanizer is stable, the loss of ethylene at the top of the demethanizer is reduced, and column top and bottom products of the demethanizer are qualified.

Description

technical field [0001] The invention belongs to the field of ethylene production devices, and more particularly relates to a device and a method for improving the start-up operation of a demethanizer of an ethylene device. Background technique [0002] In an application example of ethylene production, the pressure of the demethanizer is about 3.1 MPaG, and the temperature at the top of the tower is -98°C. The light key component of the process fluid is methane and the heavy key component is ethylene. The reduction of tower top temperature helps to reduce the content of ethylene in the top of the tower and increase the yield of ethylene. The mixed gas of methane and ethylene is sent from the top of the demethanizer, and the cooling is exchanged through the top condenser. The cooling medium is ethylene refrigerant, and the minimum refrigeration temperature of the refrigerant is -101°C. The temperature of the process fluid is reduced from -96.2°C upstream to -98.3°C required ...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C11/04
Inventor 白宇辰邵璐王振维赵百仁
Owner SINOPEC ENG
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