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A Composite Process for Expansion and Energy Saving of Depropanizer of Gas Fractionation Unit

A technology of depropanizer and composite process, which is applied in the field of gas fractionation in petrochemical enterprises, can solve the problem of not enough to build a new depropanizer, and achieve the effect of expanding the processing capacity

Active Publication Date: 2020-03-06
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the newly added liquefied gas load does not increase exponentially, it is not enough to build a new depropanizer

Method used

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  • A Composite Process for Expansion and Energy Saving of Depropanizer of Gas Fractionation Unit
  • A Composite Process for Expansion and Energy Saving of Depropanizer of Gas Fractionation Unit
  • A Composite Process for Expansion and Energy Saving of Depropanizer of Gas Fractionation Unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, a 300,000-ton / year gas fractionation unit of a petrochemical enterprise is used for calculation. The original process flow is as follows figure 1 As shown, the raw material is desulfurized liquefied gas from a catalytic cracking unit with a flow rate of 36.0t / h, and its composition is shown in Table 1. The diameter of the depropanizer is 2200mm, and the number of trays is 50.

[0037] Table 1

[0038] project Content / mol% project Content / mol% ethane 0.43 Vinyl 0.02 Propylene 43.09 propane 5.45 Butene 6.40 butane 4.94 Isobutylene 12.59 Isobutane 12.18 Butene 5.76 Anti-butene 8.17 Pentane 0.97

[0039] A process flow of this example is as follows figure 2 As shown, wherein, the raw material liquefied gas 1 is heat-exchanged with the heat medium water to 80°C through the feed preheater 12, and then enters the middle part of the depropanizer 11, and the overhead gas 3 is partially...

Embodiment approach 1

[0052]When the processing capacity of the depropanizer is increased by 5-10%, implementation mode 1, working condition 2, is recommended first;

[0053] When the processing capacity of the depropanizer is increased by 10-20%, implementation mode 2, working condition 3, is preferred.

[0054] When the processing capacity of the depropanizer is expanded by 10% and 20%, the 0.4MPa steam consumption consumed by the bottom reboiler is basically unchanged, and the newly added processing capacity refers to the increased consumption of reboiler heat utilities in working condition 1. , all replaced by heat medium water at 70-100°C, which reduces the temperature level of the thermal utilities required by the depropanizer.

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Abstract

The invention discloses a production-expansion and energy-conservation compound process of a gas fractionation device. According to the compound process, a raw material is separated by utilizing a depropanization unit; the depropanization unit comprises a depropanization tower, a feed preheater, a tower top condenser, a tower top reflux tank, a tower top reflux pump and a tower bottom reboiler, wherein the feeding temperature of the depropanization tower is increased; the feeding temperature of the depropanization tower is controlled to be between 60 DEG C and 90 DEG C. According to the process provided by the invention, through increasing the feeding temperature of the depropanization tower and preferably arranging an intermediate reboiler, the gas-liquid load distribution of the depropanization tower can be effectively regulated; the liquid flooding and the tower submersion which are possibly caused as the handling capacity is increased are reasonably avoided; the production expansion of the depropanization tower is realized. Meanwhile, after the feeding temperature of the depropanization tower is increased and the intermediate reboiler is arranged, the potential temperature of a thermal utility needed by the depropanization tower can be partially decreased.

Description

technical field [0001] The invention relates to the technical field of gas fractionation in petrochemical enterprises, in particular to a compound process for expanding production and saving energy of a depropanizer of a gas fractionation device. Background technique [0002] The gas fractionation device is an important light hydrocarbon separation device in petrochemical enterprises, mainly including three-tower separation technology and four-tower separation technology. Among them, the three-tower separation technology generally includes a depropanizer, a deethanizer and a propylene tower, and the four-tower separation technology also includes a depentanizer on this basis. The gas fractionation unit is used to separate and process liquefied petroleum gas from catalytic cracking, delayed coking and other devices, and separate it into propylene, propane, mixed carbon two, mixed carbon four and pentane. The main function of the depropanizer is to separate propylene, propane,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/42
CPCB01D3/14B01D3/42
Inventor 范传宏魏志强
Owner SINOPEC ENG