Internal energy integration non-compression reflux device for ethylene separation and process flow thereof

Abstract

The invention relates to an internal energy integration non-compression reflux device for ethylene separation. The reflux device comprises an ethylene tower, an ethylene refrigeration compressor, an ethylene refrigeration compressor suction tank, an ethylene refrigerant user, an ethylene refrigerant buffer tank, an ethylene refrigerant condensation cooler, an ethylene overhead condenser, an ethylene tower compressor, an ethylene bottom reboiler and a reducing valve. A specific process flow comprises the following steps: feeding a material from a previous process into the ethylene tower; passing a produced liquid from the tower top of a rectifying section through the ethylene refrigeration compressor and the ethylene refrigerant condensation cooler and then entering into the ethylene refrigerant buffer tank; returning back the produced liquid phase from the tower bottom of the rectifying section to the top of a stripping section through the reducing valve; passing a produced gas phase from the top of the stripping section through the ethylene tower compressor and then entering into the bottom of the rectifying section, and recovering circular ethane from the bottom of the stripping section; successively feeding refrigerants into the ethylene refrigeration compressor suction tank from the buffer tank and providing cold energy for a refrigerant user; and returning back a gas-phase material flows from the tops of various suction tanks for refrigeration and compression. By using the device, the power consumption of the refrigeration compressor can be reduced so as to reduce the total energy consumption of an ethylene device.

Description

technical field [0001] The invention relates to the technical field of ethylene production, and relates to a new process for ethylene towers and ethylene refrigeration systems in ethylene plants, in particular to an internal energy-integrated non-compressed reflux process for ethylene separation, which can realize internal energy integration of ethylene and ethane components The separation is completed in the rectification column, and the power consumption of the refrigeration compressor is reduced at the same time, thereby reducing the energy consumption of the ethylene plant. Background technique [0002] The rectification process is a core process in ethylene production, and the rectification column is the key unit for product separation. In the ethylene production process, the ethylene tower is the key tower in the ethylene plant. Its purpose is to separate the mixed components of carbon dioxide, obtain qualified ethylene products at the top of the tower, and obtain etha...

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Problems solved by technology

[0004] Aiming at the problem of high energy consumption of the ethylene tower in the ethylene process, the present invention proposes to apply the internal energy integrated rectification tower to the ethylene tower in the ethylene separation process, especially the ethylene tower in the pre-depropanization and pre-hydrogenation process, and construct an ethylene tower New processes in tower and ethylene refrigeration systems such as figure 2 shown

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