Multi-element refrigerant cold box separation system and process method for propane dehydrogenation

Abstract

According to the multi-element refrigerant cold box separation system for propane dehydrogenation and the process method, the cooling capacity supply is stable, and the total energy consumption of the system is low. The invention discloses a multi-element refrigerant cold box separation system for propane dehydrogenation. Comprising a main heat exchanger, a multi-element refrigerant compressor, a multi-element refrigerant separator, a reaction gas primary gas-liquid separator, a reaction gas secondary gas-liquid separator, a pre-cooling refrigerant separator, a deep-cooling refrigerant separator, a liquid product buffer tank, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline. A reaction gas pre-cooling channel, a reaction gas cryogenic channel, a propane feeding channel, a propane gasification channel, a pre-cooling refrigerant channel, a cryogenic refrigerant channel, a multi-element refrigerant backflow channel, a purified gas product channel, a liquid product channel and a flash steam channel are arranged in the main heat exchanger. The problem that the overall energy consumption of an existing system is too large is solved, and the requirements for high purity of the purified gas product hydrogen and high recovery rate of the propylene product are met under the condition that the circulating hydrogen flow is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical cryogenic separation, in particular to a multi-component refrigerant cold box separation system and a process method for propane dehydrogenation. Background technique [0002] The cold box separation system is one of the most important and critical devices in the propane dehydrogenation plant. Although the cold box separation system currently operating in China can meet the basic requirements of the process for the product, there are still a large number of equipment, start-up and operation procedures. The disadvantages are cumbersome, complex device maintenance and operation, and the overall energy consumption of the plant is relatively high. With the continuous development of new technologies in the field of propane dehydrogenation, the cold box separation system and the supporting process technology also need to be continuously improved and optimized to adapt to the new technological developme...

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Problems solved by technology

[0002] The cold box separation system is one of the most important and critical devices in the propane dehydrogenation plant. Although the cold box separation system currently in operation in China can meet the basic requirements of the process for the product, there are still a large number of equipment, start-up and operation procedures. Disadvantages such as cumbersome, complicated device maintenance and operation, and high overall energy consumption of the factory

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