Method for recovering heat of quenching oil of ethylene unit

A technology for ethylene equipment and quenching oil, which is applied in the fields of hydrocarbon oil distillation control/regulation, preheating, petroleum industry, etc., to achieve the effects of reducing energy waste, low cost, and small workload

Active Publication Date: 2015-06-03
SHANGHAI HUIDE ENERGY INTEGRATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the process defect of insufficient heat recovery in the traditional process, and adds a heat exchanger to the original process to achieve the purpose of further recovering the effective heat of the quenching oil

Method used

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  • Method for recovering heat of quenching oil of ethylene unit

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Embodiment 1

[0015] Example 1: Transformation of the quench oil heat recovery system of an 800,000-ton ethylene plant.

[0016] Such as figure 1 As shown in the original heat recovery process, after the quench oil at the bottom of the main fractionation tower 1 of the ethylene plant is drawn out through the pipeline 2 for sending out the quench oil at the bottom of the tower, the temperature of the quench oil at the bottom of the tower is 210°C, and after exiting the tower, it is divided into There are two paths, one path directly returns to the lower section of the main fractionation tower 1, and the other path provides heat source for the steam drum top water through the original steam drum top water preheater 5, and the temperature of the column bottom oil returning to the tower is 180°C.

[0017] The modified heat recovery process is as follows: figure 1 The bold part shows: (1) After the original steam drum water preheater 5, a new steam drum water preheater 6 is connected in series,...

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Abstract

The invention relates to a method for recovering the heat of the quenching oil of an ethylene unit. A traditional quenching oil heat recovery process generally comprises the following steps: dividing the quenching oil into two branches, feeding one branch into a cracked fuel oil stripping tower, taking the other branch as a heat source of a diluent steam generator, injecting the heat-exchanged quenching oil into a cracked oil gas pipeline behind a cracking furnace for mixing with the cracked oil and then returning to a main fractioning tower. In the traditional process, the quenching oil is taken as the heat source of the diluent steam generator and then directly mixed with the high-temperature oil gas obtained from the cracking furnace, and therefore, the heat is not recovered thoroughly. The modification method comprises the following steps: (1) connecting a preheater with the existing gas bag feed water preheater in series for intensifying heat exchange between the gas bag feed water and the quenching oil to increase the temperature of the gas bag feed water; (2) additionally arranging a reboiler to the bottom of a process water stripping tower or replacing the existing reboiler by a reboiler with the quenching oil as the heat source. The modification method is capable of effectively recovering the superfluous heat of the quenching oil and reducing the energy waste, and is low in workload and cost.

Description

technical field [0001] The invention relates to a method for recovering heat from quenching oil of an ethylene unit. Background technique [0002] The feed of the main fractionation tower of the ethylene plant is pyrolysis gas, and part of the oil after heat exchange and heat recovery of the bottom oil is mixed with the pyrolysis gas, which has a rapid cooling effect on the pyrolysis gas, so it is also called quenching oil. The traditional process of tower bottom oil is generally divided into two paths, one path is used as the feed of the pyrolysis fuel oil stripping tower; the other path is used as the heat source of the dilution steam generator, and then mixed with the cracked oil gas and returned to the main fractionation tower. Utilizing the quenching oil at the bottom of the ethylene main fractionation tower as the heat source of the dilution steam generator system is the main way to recover the heat of the bottom oil in the ethylene industry. It is used to generate low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00C10G7/12F22D1/00
Inventor 张高博
Owner SHANGHAI HUIDE ENERGY INTEGRATION TECH
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