Heat Utilization System and Heat Utilization Method for Middle Stage Oil of Catalytic Cracking Unit

A catalytic cracking unit and heat technology, which is applied to the heat utilization system and the heat utilization field of the oil in the first middle section of the catalytic cracking unit, can solve the problems that the heat cannot be effectively utilized and the energy consumption of the device is large, so as to improve the heat utilization grade and reduce the heating rate. load, the effect of reducing the amount of steam

Active Publication Date: 2017-11-07
SHANGHAI YOUHUA PROCESS INTEGRATED TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art that the heat of a middle section oil in the middle section oil section of a fractionation tower cannot be effectively utilized and the energy consumption of the device is large, the present invention provides a heat utilization system and heat utilization system for a catalytic cracking unit middle section oil Method, the system and method make full use of the heat of the high-temperature position of a middle section of oil by adjusting the heat exchange process, reduce the steam consumption of the reboiler at the bottom of the desorption tower, and finally achieve the purpose of saving energy

Method used

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  • Heat Utilization System and Heat Utilization Method for Middle Stage Oil of Catalytic Cracking Unit
  • Heat Utilization System and Heat Utilization Method for Middle Stage Oil of Catalytic Cracking Unit
  • Heat Utilization System and Heat Utilization Method for Middle Stage Oil of Catalytic Cracking Unit

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Embodiment 1

[0031] Such as figure 1 As shown, the present embodiment provides a heat utilization system of a catalytic cracking unit-middle section oil, and the system includes: a fractionation tower 1, a stabilizing tower system, an analysis tower system and a heat medium water heat exchanger 7, and the stabilizing tower system includes Stabilizing tower 2 and stabilizing tower bottom reboiler 3, desorption tower system includes desorption tower 4 and desorption tower bottom reboiler 5, a middle oil outlet of fractionation tower 1 and stabilization tower bottom reboiler 3, desorption tower The bottom reboiler 5 is connected to the heat medium water heat exchanger 7 in sequence, and a middle oil outlet of the heat medium water heat exchanger 7 is connected to the feed port of the fractionation tower 1 .

[0032] Wherein, the desorption tower system also includes a desorption tower steam reboiler 6, and the temperature of the desorption tower 4 in the desorption tower system is controlled ...

Embodiment 2

[0035] In this embodiment, the system described in Embodiment 1 is used for heat utilization, and the specific method is as follows:

[0036] In catalytic cracking, the middle-stage oil with a temperature of 250-300°C produced by the fractionation tower 1 first enters the bottom reboiler 3 of the stabilization tower, and is used as a heat source for the bottom reboiler 3 of the stabilization tower for heat exchange. After the heat exchange, the middle-stage oil The temperature dropped to 246°C;

[0037] Then, a middle-section oil enters the reboiler 5 at the bottom of the desorption tower again, and performs heat exchange as a heat source of the reboiler 5 at the bottom of the desorption tower, and the temperature of a middle-section oil after the heat exchange drops to 235° C.;

[0038] Finally, the heat-exchanged mid-stage oil enters the heat medium water heat exchanger 7 to exchange heat with the heat medium water, and the mid-stage oil with a temperature of 231° C. returns...

Embodiment 3

[0048] Except that the temperature of a middle section oil after heat exchange with the bottom reboiler 3 of the stabilization tower is 270°C, the temperature of a middle section oil after heat exchange with the bottom reboiler 5 of the desorption tower is 260°C, and the temperature of a middle section oil and heat medium water Except that the temperature of the heat exchanger 7 after heat exchange is 250° C., other operating steps are the same as in Example 2.

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Abstract

The invention provides a catalytic cracker primary midsection oil heat utilization system. The system comprises a fractionating tower, a stabilizing tower system, a resolution tower system and a heat medium water-to-water heat exchanger, wherein the stabilizing tower system comprises a stabilizing tower and a stabilizing tower bottom reboiler; the resolution tower system comprises a resolution tower and a resolution tower bottom reboiler; a primary midsection oil outlet of the fractionating tower is connected with the stabilizing tower bottom reboiler, and the resolution tower bottom reboiler is connected with the heat medium water-to-water heat exchanger; and a primary midsection oil outlet of the heat medium water-to-water heat exchanger is connected with a feed port of the fractionating tower. By regulating the heat exchange process, the system and method fully utilize the heat of the high-temperature position of the primary midsection oil, continuously utilize the primary midsection oil as the heat source of the stabilizing tower bottom reboiler and the resolution tower bottom, and reduce the steam consumption for the resolution tower bottom reboiler, thereby finally achieving the goal of lowering the energy consumption of the catalytic cracker.

Description

technical field [0001] The invention belongs to the field of catalytic cracking, and relates to a heat utilization system and a heat utilization method of a catalytic cracking unit, in particular to a heat utilization system and a heat utilization method of a middle stage oil of a catalytic cracking unit. Background technique [0002] Catalytic cracking unit is currently an important high energy consumption unit in refineries. In the energy consumption of the entire refinery production unit, the energy consumption of catalytic cracking unit accounts for a large proportion. Therefore, how to do a good job in energy saving and consumption reduction of catalytic cracking unit is the research an important point. [0003] At present, my country's catalytic cracking units generally include reaction, fractionation, absorption stabilization, and gasoline refining. The middle part of the catalytic cracking fractionation tower has a middle oil zone and a second middle oil zone from to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/06
CPCC10G55/06
Inventor 戴维沈雪松陈宇
Owner SHANGHAI YOUHUA PROCESS INTEGRATED TECH CO LTD
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