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System and method for heat utilization of tail oil of hydrocracking fractionation tower

A hydrocracking and fractionation tower technology, applied in hydrocracking and petrochemical fields, can solve the problems of high temperature of hydrogenated tail oil, unreasonable heat utilization, large heat transfer temperature difference, etc. The effect of reducing calories and reducing consumption

Active Publication Date: 2021-09-28
SHANGHAI YOUHUA PROCESS INTEGRATED TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing process flow, the temperature of the hydrogenated tail oil is relatively high, and there are the following problems in heat utilization: First, the stream temperature of the reboiler of the jet fuel stripper is 210-240°C. Hydrogen tail oil is used as a heat source, and the heat transfer temperature difference is large. The loss is relatively large; the second is that the hydrogenated tail oil is heat-exchanged to 290-320°C through the reboiler of the aviation coal stripper, and the steam generator generates low-pressure steam. The temperature of the hydrogenated tail oil is relatively high, which is high-quality and low-use. Unreasonable use of heat

Method used

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  • System and method for heat utilization of tail oil of hydrocracking fractionation tower
  • System and method for heat utilization of tail oil of hydrocracking fractionation tower
  • System and method for heat utilization of tail oil of hydrocracking fractionation tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Taking the 2.6 million tons / year hydrocracking unit of a certain oil refinery as an example, the temperature in front of the fractionating tower feed heating furnace is increased by 9°C, and the ratio of tail oil to catalysis and circulation is 100:0. A method for utilizing heat from fractionation tower tail oil.

[0063] The heat load changes of the fractionation tower feed heating furnace and steam generator before and after optimization are shown in Table 1 below.

[0064] Table 1 Example 1 before and after the optimization of fractionation column feed heating furnace and steam generator heat load change

[0065] Logistics / Tower Heat load of feed heating furnace, kW Heat load of steam generator, kW Transformation of the former 40335 15425 After transformation 37281 12371 Variation 3054 3054 rate of change 7.6％ 19.8％

[0066] The benefit comparison of the hydrocracking unit before and after optimization is shown in Table ...

Embodiment 2

[0072] Taking the 2.6 million tons / year hydrocracking unit of a certain oil refinery as an example, the temperature in front of the fractionating tower feed heating furnace is increased by 9°C, and the ratio of tail oil to catalysis and circulation is 50:50 for analysis to illustrate the present invention. Heat utilization method of cracked tail oil.

[0073] The heat load changes of the fractionation tower feed heating furnace and steam generator before and after optimization are shown in Table 3 below.

[0074] Table 3 Example 2 before and after the optimization of fractionation column feed heating furnace and steam generator heat load changes

[0075]

[0076] The benefit comparison of the hydrocracking unit before and after optimization is shown in Table 4 below.

[0077] Benefit after table 4 embodiment 2 optimization

[0078]

[0079] Note: Calculated according to the standard calorific value of natural gas 4.186MJ / kg, and the annual operating time is 8400h.

[...

Embodiment 3

[0082] Taking the 2.6 million tons / year hydrocracking unit of a certain oil refinery as an example, the temperature in front of the fractionating tower feed heating furnace is increased by 9°C, and the ratio of tail oil to catalyst and circulation is 20%: 80%. The heat utilization method of cracked tail oil of the present invention.

[0083] The heat load changes of the fractionation tower feed heating furnace and steam generator before and after optimization are shown in Table 5 below.

[0084] Table 5 Example 3 before and after the optimization of fractionation tower feed heating furnace and steam generator heat load changes

[0085] Logistics / Tower Heat load of feed heating furnace, kW Heat load of steam generator, kW Transformation of the former 34767 3294 After transformation 31713 2646 Variation 3054 648 rate of change 8.8 19.7

[0086] The benefit comparison of the hydrocracking unit before and after optimization is shown i...

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Abstract

The invention provides a hydrocracking fractionation tower tail oil heat utilization system and method, the system includes a feed liquid separation tank, a heating furnace feed heat exchanger, a heating furnace and a fractionation tower, the feed liquid separation tank The liquid phase discharge port is connected with the feed port of the heating furnace after passing through the first channel of the heating furnace feed heat exchanger, and the discharge port of the heating furnace is connected with the liquid phase feed of the fractionation tower. The tail oil outlet of the fractionation tower is connected with the second channel inlet of the furnace feed heat exchanger, so that the tail oil of the fractionation tower is connected with the liquid phase of the feed liquid separator tank The output is heat exchanged at the furnace feed heat exchanger. The invention provides a scheme for effectively utilizing the heat of the tail oil of the fractionation tower, which uses the tail oil of the fractionation tower to exchange heat with the feed material of the fractionation tower, fully utilizes the heat of the tail oil of the fractionation tower, and reduces the fuel gas consumption of the heating furnace of the feed.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to the technical field of hydrocracking, and in particular to a system and method for utilizing heat from tail oil of a hydrocracking fractionation tower. Background technique [0002] Hydrocracking is to convert heavy oil into light oil (gasoline, kerosene, diesel or catalytic cracking) by hydrogenation, cracking and isomerization of heavy oil under the action of catalyst under high pressure and temperature. , Cracking raw materials for olefins) processing. [0003] The hydrocracking unit mainly includes two parts: a reaction unit and a fractionation unit. The fractionation unit is composed of a stripper and a fractionation tower. The gas-liquid separation of the flash tank, the gas phase directly enters the fractionation tower, and the liquid phase is heated by the feed furnace of the fractionation tower and then enters the fractionation tower. The cracked tail oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
CPCC10G67/00
Inventor 刘吉顺阮慧娟王弘一陆前程余金森
Owner SHANGHAI YOUHUA PROCESS INTEGRATED TECH CO LTD