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A reforming pretreatment system, reforming pretreatment method and application

A pretreatment and prehydrogenation technology, applied in the treatment of hydrocarbon oil, hydrotreating process, petroleum industry, etc., can solve the problems of incomplete heat exchange, low energy utilization efficiency, large efficiency loss, etc., and achieve energy saving effect Obviously, the effect of reducing the loss of effective energy and saving energy

Active Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the pretreatment system of the above-mentioned reforming unit, the pre-hydrogenation reaction product after heat exchange from the pre-hydrogenation feed heat exchanger contains a lot of heat, and the heat exchange with the stripping tower feed has not been completed; the pre-fractionation The heat exchange between the depentanized oil at the bottom of the tower and the naphtha fed to the pre-fractionation tower has the problems of large effective energy loss and low energy utilization efficiency

Method used

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  • A reforming pretreatment system, reforming pretreatment method and application
  • A reforming pretreatment system, reforming pretreatment method and application
  • A reforming pretreatment system, reforming pretreatment method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0048] This embodiment provides an existing reforming pretreatment system 200, refer to figure 1 As shown, taking the 840,000 tons / year continuous reforming raw material pretreatment system of a refinery as an example, the pretreatment system of this device adopts the process mode of "fractionation first and then hydrogenation". It includes pre-fractionation tower feed heat exchanger 210, pre-fractionation tower 1, pre-fractionation tower reboiler 2, pre-hydrogenation feed heat exchanger 220, pre-hydrogenation heating furnace 3, pre-hydrogenation reactor 4, Stripper feed heat exchanger 230, prehydrogenation product air cooler 240, prehydrogenation product water cooler 250, prehydrogenation gas-liquid separation tank 260, stripper bottom heat exchanger 270, stripper 5 and stripper Tower kettle reboiler 6.

[0049] refer to figure 1 As shown, the naphtha raw material from the naphtha stabilization system first passes through the feed heat exchanger 210 of the pre-fractionation...

Embodiment 2

[0058] This embodiment provides a reforming pretreatment system 200 provided by the present invention, refer to figure 2 As shown, taking the 840,000 tons / year continuous reforming raw material pretreatment system of a refinery as an example, the pretreatment system of this device adopts the process mode of "fractionation first and then hydrogenation". It includes pre-fractionation tower feed heat exchanger 210, pre-fractionation tower 1, pre-fractionation tower reboiler 2, pre-hydrogenation feed heat exchanger 220, pre-hydrogenation heating furnace 3, pre-hydrogenation reactor 4, Stripper feed heat exchanger 230 , prehydrogenation product air cooler 240 , prehydrogenation product water cooler 250 , prehydrogenation gas-liquid separation tank 260 , stripper bottom heat exchanger 270 .

[0059] refer to figure 2 As shown, the naphtha raw material from the naphtha stabilization system first passes through the pre-fractionator feed heat exchanger 210 and the pre-hydrogenation ...

experiment example 1

[0067] See Table 1 and Table 2 for comparison of energy consumption and effective energy loss of the methods and devices provided in Embodiment 1 and Embodiment 2.

[0068] Table 1 Comparison of heat exchange loads between Example 1 and Example 2.

[0069] Example 1 Example 2 Increase / decrease, % Prefractionator feed heat exchanger load, kW 902.94 902.94 0.00 Stripper feed heat exchanger load, kW 1450.42 3029.51 -108.87 Stripper feed / bottom heat exchanger load, kW 8423.68 6641.38 21.16 Air cooler load of pre-hydrogenated product, kW 2477.61 1092.52 55.90 Pre-hydrogenation product water cooler load, kW 1878.43 785.72 58.17 Pre-fractionation column reboiler, kW 8536.00 0.00 100.00 Prehydrogenation furnace, kW 3194.00 2291.06 28.27

[0070] Table 2 Example 1 and Example 2 comparison of exergy loss.

[0071]

[0072] It can be seen from Table 1 that the heat exchange load of the feed heat exchanger 210 ...

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Abstract

The invention discloses a reforming pretreatment system, a reforming pretreatment method and an application thereof, and relates to the technical field of catalytic reforming. On the basis of studying the characteristics of the process flow of the reforming pretreatment system and combining the first and second laws of thermodynamics, the optimal design of the effective energy recovery and utilization of the pretreatment system is carried out. By fully recovering the heat of the pre-hydrogenation reaction product, the naphtha feed of the pre-fractionation tower is added to exchange heat with the pre-hydrogenation reaction product, the temperature of the depentanized oil at the bottom of the pre-fractionation tower is increased, and the bottom oil of the pre-fractionation tower is separated from the pre-fractionation tower bottom oil. The hydrogenation feed heat exchanger directly performs heat exchange and temperature rise, which saves the energy consumption of the heating furnace and reduces the loss of effective energy. Compared with the prior art, the energy saving effect of the reforming pretreatment system provided by the present invention is obvious.

Description

technical field [0001] The invention relates to the technical field of catalytic reforming, in particular to a reforming pretreatment system, a reforming pretreatment method and an application. Background technique [0002] As the pretreatment unit of the reforming reaction system, the reforming unit pretreatment system is an indispensable part of the reforming unit. Generally, straight-run naphtha fractions or naphtha from naphtha stabilization systems are used as raw materials, and impurities in light naphtha are removed through pre-fractionation, pre-hydrogenation and stripping to obtain refined oil, and then processed in Under certain reaction conditions, a reforming reaction occurs to produce high-octane gasoline components and aromatics. [0003] The feed to the pre-fractionation system is mainly the straight-run naphtha fraction with an initial boiling point of ~175°C or the naphtha from the naphtha stabilization system, which is exchanged with the depentanized oil a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/1044
Inventor 孙欢欢经铁郭建波张英哲王志刚
Owner CHINA PETROLEUM & CHEM CORP
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