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Method for flexibly preheating boiler feed water and recovering pyrolysis gas heat, and heat exchange system of ethylene cracking furnace

An ethylene cracking furnace and boiler feed water technology, applied in the field of petrochemical industry, can solve the problems of insufficient energy utilization, short production cycle, poor flexibility, etc., achieve better heat transfer effect, slow down coking, and simple design

Active Publication Date: 2020-11-17
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 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, as well as solve the problems of poor operation flexibility, easy coking and short production cycle of the current devices, and provide a flexible boiler water supply system. The method of permanent preheating and cracking gas heat recovery and the corresponding ethylene cracking furnace heat exchange system

Method used

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  • Method for flexibly preheating boiler feed water and recovering pyrolysis gas heat, and heat exchange system of ethylene cracking furnace
  • Method for flexibly preheating boiler feed water and recovering pyrolysis gas heat, and heat exchange system of ethylene cracking furnace
  • Method for flexibly preheating boiler feed water and recovering pyrolysis gas heat, and heat exchange system of ethylene cracking furnace

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Effect test

Embodiment 1

[0051] Present embodiment 1 (flexibility 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 3 and a second quench heat exchanger group 3; the first quench heat exchanger group 3 includes two stages of serial quench heat exchangers, respectively A first-stage rapid cooling heat exchanger, a second-stage rapid cooling heat exchanger; the second rapid cooling heat exchanger group 3 includes a first-stage rapid cooling heat exchanger, which is a third-stage rapid cooling heat exchanger; the first stage rapid cooling heat exchanger The first-stage quenching heat exchanger is a vertical 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 preheater b of the ethylene cracking furnace includes an independently ar...

Embodiment 2

[0063] Present embodiment 2 (flexibility 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 set in the process.

[0064] 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 turn for heat exchange; wherein, the cracking gas passes through the thermosiphon in the first quenching heat exchanger and comes from The boiler feed water of the steam drum performs heat exchange, and in the second-stage quenching heat exchanger, it exchanges heat with a stream of boiler feed water preheated by the upper boiler feed water preheater to realize heat recovery.

[0065] Boiler feed water from the boundary area is divided into two paths and enters the upper boiler feed water preheater BFW-I and the lower bo...

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Abstract

The invention belongs to the field of petrochemical engineering, and relates to method for flexibly preheating boiler feed water and recovering pyrolysis gas heat, and a heat exchange system of an ethylene cracking furnace. According to the invention, boiler feed water from a boundary area is preheated in a boiler feed water preheater of a convection section of the cracking furnace, and the boilerfeed water preheater comprises an upper boiler feed water preheater and a lower boiler feed water preheater which are independently arrange; the boiler feed water from the boundary area is divided into two paths which respectively enter the upper boiler feed water preheater and the lower boiler feed water preheater for preheating; and cracking gas at the outlet of a radiation sectionthe of the cracking furnace sequentially enters a first quenching heat exchanger group and a second quenching heat exchanger group for heat exchange. According to the flexible process in the invention, the energyutilization rate and the production flexibility of a device are remarkably improved, energy conservation and consumption reduction in the production process are achieved, the yield of ultrahigh-pressure steam is increased, a coking reaction is delayed, and the overall economy of the ethylene cracking device is improved.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and more specifically relates to a method for flexible preheating of boiler feed water and heat recovery of cracked gas, and a heat exchange system for 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, the general ethylene cracking furnace is mainly composed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/18C07C4/04C07C11/04C07C5/327
CPCC10G9/18C07C4/04C07C5/327C07C11/04Y02P20/50
Inventor 何细藕赵永华郭凡李昌力
Owner SINOPEC ENG
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