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Heat exchange process and heat exchange system for ethylene cracking furnace

A technology of ethylene cracking furnace and heat exchange system, which is applied in steam boilers, lighting and heating equipment, steam generation, etc. It can solve the problems of insufficient energy utilization and high energy consumption, reduce condensation and coking, prolong production cycle, and improve energy conversion. The effect of thermal efficiency

Active Publication Date: 2019-12-31
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high energy consumption and insufficient energy utilization in the current heat exchange technology of cracking furnaces, and provide a heat exchange process and heat exchange system for ethylene cracking furnaces. The present invention can not only improve energy utilization, And it can reduce the occurrence of coking reaction in the quenching heat exchanger, which is beneficial to the normal operation of the device

Method used

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  • Heat exchange process and heat exchange system for ethylene cracking furnace
  • Heat exchange process and heat exchange system for ethylene cracking furnace
  • Heat exchange process and heat exchange system for ethylene cracking furnace

Examples

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Embodiment 1

[0052] Present embodiment 1 (energy-saving flow process 1), adopts such as Figure 5 The cracking furnace of the ethylene plant is shown. The heat exchange system includes a steam drum 4, a first quench heat exchanger group and a second quench heat exchanger group; Heat exchanger, the second-stage quenching heat exchanger; the second quenching heat exchanger group includes a first-stage quenching heat exchanger, which is a third-stage quenching heat exchanger; the first-stage quenching heat exchanger is a vertical The linear quenching heat exchanger; the second-stage quenching heat exchanger and the third-stage quenching heat exchanger are horizontal shell-and-tube quenching heat exchangers. The boiler feed water preheating section b of the ethylene cracking furnace is divided into an upper boiler feed water preheating section BFW-I and a lower boiler feed water preheating section BFW-II connected thereto; the first stage quenching heat exchanger and the second stage The she...

Embodiment 2

[0064] Present embodiment 2 (energy-saving flow process 2), adopts such as Figure 6 The cracking furnace of the ethylene plant is shown. The difference from Example 1 is that only two stages of rapid cooling heat exchangers are included in the process.

[0065] After the cracked gas comes out of the furnace tube of the radiant section of the cracking furnace, it passes through the first-stage quenching heat exchanger and the second-stage quenching heat exchanger in sequence; wherein, the cracked gas is exchanged with the boiler feed water from the steam drum in the first quenching heat exchanger. Heat exchange, heat exchange with the boiler feed water preheated by the convection section in the second-stage quenching heat exchanger.

[0066] After all the boiler feed water is preheated by the upper boiler feed water preheating section BFW-I, part of the boiler feed water is sent to the second stage quenching heat exchanger to exchange heat with the cracked gas; the other part...

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Abstract

The invention belongs to the field of petrochemical engineering, and relates to a heat exchange process and a heat exchange system for an ethylene cracking furnace. During the heat exchange process, the boiler water supply preheated through a convection section of the cracking furnace is divided into two channels, one channel enters the convection section continuously for further preheating, andthen enters a steam pocket to perform heat exchange with pyrolysis gas in a first quenching heat exchanger group, the other channel enters a second quenching heat exchanger group to perform heat exchange with the pyrolysis gas from the first quenching heat exchanger group so that the temperature of the pyrolysis gas is further reduced, meanwhile, the boiler water supply is heated further so as torecover the heat of the pyrolysis gas further. The energy-saving process of the invention significantly improves the energy utilization of the device, realizes the energy-saving and cost-reducing during a production process, while increasing the yield of super high steam, and improving the economic efficiency of the ethylene cracking device. In addition, this process technology is helpful for theburning process of a furnace tube and a quenching heat exchanger in the device, and is beneficial to the safe, long-term and efficient operation of the production device.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and more specifically relates to a heat exchange process of an ethylene cracking furnace and a heat exchange system of an ethylene cracking furnace. Background technique [0002] The ethylene cracking furnace is a process device that generates ethylene through steam thermal cracking of petrochemical raw materials such as naphtha, diesel oil, hydrogenated tail oil, ethane, propane, and LPG, and produces ultra-high pressure steam by-product. The energy consumption of the device accounts for 50-60% of the total energy consumption of ethylene production. Effectively improving the thermal efficiency and steam output of the cracking unit is the key to realizing energy saving and consumption reduction and improving economic benefits in the ethylene production process. [0003] as attached figure 1 As shown, a general ethylene cracking furnace is mainly composed of three parts: a cracking furnace ...

Claims

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Application Information

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IPC IPC(8): F22B31/08
CPCF22B31/08
Inventor 何细藕王子宗赵永华袁晴棠郭凡李昌力
Owner SINOPEC ENG
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