Ethylene quenching apparatus and compressing energy-saving technique

Abstract

The present invention relates to an ethylene quenching device and a compressing and energy-saving technique; the ethylene quenching device comprises a quencher, a gas-oil fractionating tower, a diesel stripping tower, a fuel oil stripping tower and a compression and separation system; and after being fractionated and cooled by the quencher and the gas-oil fractionating tower, the pyrolysis gas coming from a waste heat boiler directly enters into the compression and separation system. The present invention has the following characteristics: the pyrolysis gas collected from the top of the gas-oil fractionating tower directly receives compression, separation and heat exchange; and a quenching water tower is not needed. The present invention has the following obvious advantages: a water scrubbing tower is not needed, equipment investment and energy used by a quenching water circulating pump are saved, the stream temperature of the outlet of the compressor of each section is high, and a great deal of high-energy-level latent heat can be recovered by heat exchange.

Description

technical field [0001] The invention relates to a petrochemical cracking gas quenching and separation process, in particular to an ethylene quenching device and a compression energy-saving process. Background technique [0002] As a basic petrochemical raw material, ethylene is a leading petrochemical product, and its production capacity is an important symbol to measure the level of a country's petrochemical industry. The petrochemical industry is always a joint enterprise centered on ethylene production and supporting the processing and production of various products. The scale, cost, production stability and product quality of ethylene production will play a dominant role in the entire joint venture. [0003] The quenching system is an important part of the ethylene plant. As the first process of ethylene cracking gas treatment, it often becomes the bottleneck restricting the output and long-term stable operation of the ethylene plant. Its operation has an important impa...

AI Technical Summary

Problems solved by technology

The problem with the current ethylene plant is that the energy recovery efficiency of the quenching system is not high

The quenching system mainly recovers the heat of cracked gas through quenching water and quenching oil. Generally speaking, the temperature of quenching oil is about 190-200°C, and the recovered heat energy level is relatively high, which can be used to generate dilution steam; while the temperature of quenching water is about 80 ~ 90 ℃, the heat energy level is low, it can only be used for process water heating or public works, and this part of energy has a large proportion of the total energy due to the latent heat of water, so the energy utilization efficiency is very low

Images