Device for recycling light dydrocarbon and nitrogen in olefin torch pipe network

Abstract

The invention provides a device for recycling light dydrocarbon and nitrogen in an olefin torch pipe network. Gas in the olefin torch pipe network enters a light dydrocarbon tower to be separated through condensing cooling, light dydrocarbon products are rectified from the bottom of the light dydrocarbon tower, the light dydrocarbon products are pressurized through a low-temperature pump, cooled through a heat exchanger and then conveyed to an olefin separation device to be separated, top products of the light dydrocarbon tower enter a nitrogen tower, nitrogen products are generated on the topof the nitrogen tower, cooled through the heat exchanger and then conveyed to a nitrogen pipe network, and high-methane gas generated at the bottom of the nitrogen tower is cooled through the heat exchanger and then used as fuel gas to be fed into an external fuel gas pipe network. According to the device for recycling the light dydrocarbon and the nitrogen in the olefin torch pipe network, the light dydrocarbon and nitrogen products are recycled from the torch gas pipe network in a low-temperature rectification separation manner, the recycled light dydrocarbon products are used as olefin rawmaterials to be directly fed to the olefin separation device to be separated, the nitrogen products are used as supplementary nitrogen to be directly fed into the complete plant nitrogen pipe network, effective components in torch gas are fully utilized, and recycling benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of chemical tail gas, in particular to a device for recovering light hydrocarbons and nitrogen in an olefin torch pipe network. Background technique [0002] Light hydrocarbons are important chemical raw materials. There are still regular discharge points in the olefin factory, and there are many valve leakage points in the whole plant. There is always a large amount of direct discharge of effective components in the flare gas. In order to reduce the effective components in the flare gas Some factories pressurize the flare gas with a compressor, water-cool it to 40°C for separation, recover the heavy components, and discharge the light components directly into the fuel gas pipeline network for combustion, resulting in a great waste of resources. [0003] In the olefin factory, there are a large number of effective components in the flare gas pipeline network, and there are more e...

AI Technical Summary

Problems solved by technology

[0002] Light hydrocarbons are important chemical raw materials. There are still regular discharge points in the olefin factory, and there are many valve leakage points in the whole plant. There is always a large amount of direct discharge of effective components in the flare gas. In order to reduce the effective components in the flare gas Some factories pressurize the flare gas with a compressor, water-cool it to 40°C for separation, recover the heavy components, and discharge the light components directly into the fuel gas pipeline network for combustion, resulting in a great waste of resources

Images