Energy-saving device and operation process for absorption-stabilization system

Abstract

The invention relates to an energy-saving device and an operation process for an absorption-stabilization system and a lean gas pre-balancing system is arranged at the top of an absorption tower. The lean gas pre-balancing system comprises a pre-balancing cooler, a pre-balancing tank and a pressurization pump; a supplementary absorbent and gas at the top of the absorption tower enter the pre-balancing tank after cooling for completing the pre-balancing operation, the gas phase of an outlet is lean gas, and the liquid phase is pressurized to be taken as the absorbent for the absorption tower. The invention has the advantages that the amount of the supplementary absorbent needed for stabilizing gasoline is reduced; heat loads of a desorption tower, a reboiler at the bottom of a stabilization tower and the like are reduced; loads of a liquefied gas condensing tank at the top of the stabilization tower, a gas-liquid separation tank after a compressor and the like are alleviated; the yieldof the lean gas is lowered, thereby being conductive to improving the yield of the liquefied gas and the gasoline and having significant energy-saving effect and economic benefits.

Description

technical field [0001] The invention relates to a petroleum refining process, in particular to an energy-saving device and an operating process for an absorption stabilization system. Background technique [0002] The absorption and stabilization system is a post-processing system for catalytic cracking and delayed coking devices. It separates raw naphtha and rich gas from the top of the main fractionation tower into product liquefied gas and stable gasoline, and at the same time obtains dry gas as a by-product. The product quality and energy consumption of the absorption stabilization system have a very important influence on the economic benefit of the whole processing unit. [0003] With the development of the economy, energy saving and product quality improvement have gradually become the most concerned issues in the oil refining industry. The old devices of the absorption stabilization system in the 1960s were all single-tower processes. The so-called single-tower proc...

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Problems solved by technology

The single-tower process mainly has the following disadvantages: the absorption and desorption processes are carried out in the same tower, and the mutual interference is large; it is difficult to achieve a high absorption rate and desorption rate; it is difficult to control and adjust the device

[0006] The double-tower process overcomes the shortcomings of the single-tower process to a certain extent, but its process generally has the following problems: (1) The desorption tower is excessively desorbed, resulting in a large amount of C between the absorption tower and the desorption tower. 3 、C 4 Component recycling increases the energy consumption of the absorption stabilization system

(2) The absorption effect of the absorption tower is not ideal, and the lean gas contains a large amount of liquefied gas and stable gasoline, and the components of liquefied gas and stable gasoline circulate in the fractionation system and the absorption stabilization system, which further increases the energy consumption of the device

(3) The absorption effect of the reabsorption tower is not satisfactory, the content of C3 and C4 in the dry gas exceeds the standard, the yield of liquefied gas and stable gasoline decreases, and the economic benefits of the device are reduced

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