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Catalytic cracking process allowing improved upcycling of the calories from the combustion fumes

A catalytic cracking and catalytic cracking device technology, which is applied in the field of catalytic cracking of petroleum fractions, can solve problems such as hot spots of destruction, and achieve the effects of reducing consumption and being easy to upgrade and recover.

Active Publication Date: 2015-07-15
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] This recirculation of the "slurry" fraction or fuel oil No. 2 fraction to the regenerator is problematic because temperatures prevailing in the regenerator are about 650°C to 750°C and a portion of this recycle evaporates, forming Cracked gases are found in the dilute phase of the

Method used

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  • Catalytic cracking process allowing improved upcycling of the calories from the combustion fumes
  • Catalytic cracking process allowing improved upcycling of the calories from the combustion fumes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0084] Example 3, referred to as "Basic case for a plant using insufficient coke", exemplifies a reference case for an FCC whose operating conditions do not make it possible to ensure thermal balance.

[0085] The heat balance in this case is achieved by additionally preheating the feedstock to the blast furnace operated with fuel oil. In this Example 3, the heat integration of the flue gases is carried out according to a conventional system; the installation obviously does not have a catalyst cooler.

Embodiment 4

[0086] Example 4 Example 3 was repeated but with an embodiment according to the invention.

[0087] The pressure and temperature conditions of the different steams generated in all the examples are as follows:

[0088]

Embodiment 1

[0089] Example 1 (according to prior art): Basic situation of a plant operating with excess coke

[0090] In the considered example, the flue gases arrive upstream of the waste heat boiler at 675°C with a mass flow of 295 tons per hour and are directed continuously to:

[0091] 1 - A steam generating device called a waste heat boiler, enabling the generation of high and low pressure steam. At the end of this stage, the flue gas exits at 340°C.

[0092] 2- Electrostatic precipitator for removing dust from it.

[0093] 3 - Economizer 1, which enables the generation of low pressure steam and preheating of hot water. At the end of this stage, the temperature of the flue gas is lowered from 340°C to 200°C in order to suppress the downstream DeNO X and DeSO X Keep the heat level to a minimum in terms of phases.

[0094] 4-DeNO X and DeSO X A device which does not affect the heat level of the flue gas.

[0095] 5 - Economizer 2 for preheating the water used in the waste heat ...

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Abstract

The present invention describes a process for the production of gasoline using a catalytic cracking unit, processing conventional heavy cuts in a wide Conradson carbon range from 0.1 to 0.8, said process comprising a preheating of the combustion air downstream of the air compressor by heat exchange with the combustion fumes originating from the regeneration section, said fumes being collected between the waste heat boiler and the economizer.

Description

technical field [0001] The invention belongs to the field of catalytic cracking of petroleum fractions. Background technique [0002] The main purpose of the catalytic cracking unit of a refinery is to produce the main component for gasoline, ie a fraction with a distillation range between 35°C and 250°C. [0003] In a catalytic cracking unit (denoted FCC), the heat balance is ensured by the combustion of coke deposited on the catalyst during the reaction phase. This combustion takes place in the regeneration zone by injecting air through a compressor called "Main Air Blower" abbreviated MAB. [0004] Typically, the catalyst enters the regeneration zone with a coke content (defined as the mass of coke divided by the mass of catalyst) of between 0.5% and 1% and leaves the zone with a coke content of less than 0.01%. During this phase, combustion flue gases are generated and leave the regeneration zone at a temperature between 640°C and 800°C. These flue gases will then und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/18
CPCC10G11/185C10G11/05C10G11/182B01J29/90B01J38/12B01J38/32C10G11/18
Inventor F·福伊尼埃J-M·贝斯瑙尔特P·布里奥
Owner INST FR DU PETROLE