Catalytic cracker primary midsection oil heat utilization system and heat utilization method

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...

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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

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