A method for flexible preheating of boiler feed water and heat recovery of cracked gas and heat exchange system for 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: 2022-07-08
SINOPEC ENG +1
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  • 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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  • A method for flexible preheating of boiler feed water and heat recovery of cracked gas and heat exchange system for ethylene cracking furnace
  • A method for flexible preheating of boiler feed water and heat recovery of cracked gas and heat exchange system for ethylene cracking furnace
  • A method for flexible preheating of boiler feed water and heat recovery of cracked gas and heat exchange system for ethylene cracking furnace

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Embodiment 1

[0051] In the present embodiment 1 (flexibility process 1), use such as Figure 5 The cracking furnace of the ethylene plant shown. The heat exchange system includes a steam drum 4, a first quenching heat exchanger group 3 and a second quenching heat exchanger group 3; the first quenching heat exchanger group 3 includes two-stage series quenching heat exchangers, respectively A first-stage quenching heat exchanger, a second-stage quenching heat exchanger; the second-stage quenching heat exchanger group 3 includes a first-stage quenching heat exchanger, which is a third-stage quenching heat exchanger; the first-stage quenching heat exchanger The 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 feedwater preheater b of the ethylene cracking furnace includes an independently set upper boiler feedwater preheater BF...

Embodiment 2

[0063] In the present embodiment 2 (flexibility process 2), use such as Image 6 The cracking furnace of the ethylene plant shown. The difference from Example 1 is that only two-stage quenching heat exchangers are provided 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 first quenching heat exchanger and is heated with the The boiler feed water of the steam drum conducts heat exchange, and in the second-stage quenching heat exchanger, it exchanges heat with a boiler feed water preheated by the upper boiler feed water preheater to realize heat recovery.

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

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Abstract

The invention belongs to the field of petrochemical industry, and relates to a flexible preheating of boiler feed water and a heat recovery method of cracked gas and a heat exchange system of an ethylene cracking furnace. The boiler feed water from the boundary area is preheated in the boiler feed water preheater in the convection section of the cracking furnace, and the boiler feed water preheater includes an independently set upper boiler feed water preheater and a lower boiler feed water preheater. The boiler feed water in the zone enters the upper boiler feed water preheater and the lower boiler feed water preheater respectively for preheating in two ways; the cracked gas at the exit of the radiant section of the cracking furnace enters the first quenching heat exchanger group and the second quenching heat exchanger in turn. Heat exchangers are exchanged. The flexible flow process of the invention significantly improves the energy utilization rate and production flexibility of the device, realizes energy saving and consumption reduction in the production process, increases the output of ultra-high pressure steam, delays the occurrence of coking reaction, and improves the overall performance of the ethylene cracking device. economical.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and more particularly 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] 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, LPG and by-produces ultra-high pressure steam. The energy consumption of its equipment 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 of three parts:...

Claims

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Application Information

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Patent Type & Authority Patents(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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