Amine desulphurization method for refinery plant

A refinery amine and refinery gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of not fully utilizing the absorption potential of rich absorbents, desulfurization system operating costs, high energy consumption and investment, It does not consider the problem of mass exchange between rich and poor streams, and achieves the effects of preventing thermal degradation, reducing energy consumption, and reducing circulation volume

Inactive Publication Date: 2016-08-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H due to multiple refinery gas streams 2 S concentration or deH 2 The operating conditions of S are different, and the H in the rich liquid discharged after removal 2 There is a difference in S load, neither of these two types of processes considers the quality exchange of rich and poor streams, and more importantly, neither of these two methods takes full advantage of the low H 2 The absorption potential of the rich absorbent with S load, the operating cost, energy consumption and investment of the desulfurization system are relatively high

Method used

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  • Amine desulphurization method for refinery plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The desulfurization process is as follows:

[0024] The liquefied gas is sent to the lower part of the first refinery gas desulfurization tower (A) with a feed rate of 30000kg / h, a feed temperature of 35°C, and a feed pressure of 1.3 MPa. The operating temperature of the tower is 35°C, and the operating pressure is 1.112MPa, make it contact with countercurrent contact with absorbent MDEA (N-methyldiethanolamine) of 30wt% concentration that is imported from the tower top, obtain the purified liquefied gas stream (H 2 S=5mg / m 3 ≤50mg / m 3 ) and low H 2 S-loaded rich solution.

[0025] at 4900m 3 The feed amount per hour, the feed temperature of 38°C, and the feed pressure of 1.0MPa send the dry gas to the lower part of the second refinery gas desulfurization tower (B). The operating temperature of the tower is 36°C and the operating pressure is 0.85MPa , part or all of the low H from the bottom of the first refinery gas desulfurization tower (A) 2 The S-loaded rich l...

Embodiment 2

[0028] The desulfurization process in this example is the same as in Example 1 except for the operating parameters. The specific parameters are as follows: absorbent concentration 45wt%, liquefied gas feed rate 30000kg / h, feed temperature 30°C, feed pressure 1.1MPa, liquefaction The operating temperature of the gas desulfurization tower is 35°C, the operating pressure is 1MPa, and the dry gas feed rate is 4900m 3 / h, feed temperature 30°C, feed pressure 0.9MPa, dry gas desulfurization tower operating temperature 35°C, operating pressure 0.8MPa, rich liquid heat exchanger temperature 80°C, regeneration tower feed pump (E) boosted to 0.1MPa, the operating temperature of the solvent regeneration tower is 90°C, the operating pressure is 0.03MPa, the reboiler maintains the bottom temperature of the tower at 110°C, and the heat exchange cooling temperature of the rich liquid heat exchanger is 30°C.

Embodiment 3

[0030] The desulfurization process in this example is the same as in Example 1 except for the operating parameters. The specific parameters are as follows: absorbent concentration 15wt%, liquefied gas feed rate 30000kg / h, feed temperature 40°C, feed pressure 2.1MPa, liquefaction The operating temperature of the gas desulfurization tower is 45°C, the operating pressure is 2MPa, and the dry gas feed rate is 4900m 3 / h, feed temperature 40°C, feed pressure 1.1MPa, dry gas desulfurization tower operating temperature 45°C, operating pressure 1MPa, rich liquid heat exchanger temperature 110°C, regeneration tower feed pump (E) boosted to 0.3 MPa, the operating temperature of the solvent regeneration tower is 110°C, the operating pressure is 0.1MPa, the bottom temperature of the reboiler is maintained at 130°C, and the cooling temperature of the rich liquid heat exchanger is 50°C.

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Abstract

The invention relates to an amine desulphurization method for a refinery plant. The invention aims to solve the problems of insufficient utilization for low H2S loaded rich absorbent, high energy consumption and lower efficiency of the prior art. The method comprises the following steps: a) countercurrent contacting the first refinery plant gas containing H2S with a desulphurization agent in a first refinery plant desulphurization tower (A), thereby acquiring a purified first refinery plant gas flow and a low H2S loaded rich solution; b) countercurrent contacting the second refinery plant gas with partial / all low H2S loaded rich solution from the first refinery plant desulphurization tower and a supplementary desulphurization agent in a second refinery plant desulphurization tower (B), thereby acquiring a purified second refinery plant gas flow and a high H2S loaded rich solution; and c) enabling the high H2S loaded rich solution to successively pass through a rich solution heat exchanger (C), a rich solution flash tank (D) and a solvent regenerating tower (F), then entering the first refinery plant desulphurization tower (A) for recycling, performing gas-liquid separating treatment on the acid gas from the top of the solvent regenerating tower, and then feeding to a sulfur recovery device. According to the method provided by the invention, the circulation volume and regenerating volume of the desulphurization agent can be effectively reduced, and the purposes of saving energy, reducing consumption, reducing the waste of effective resources and reducing investment can be achieved.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a method for desulfurizing amine liquid in a refinery. Background technique [0002] In the process of refining and chemical production, after primary and secondary processing of raw oil, some of the sulfides are converted into H 2 S, H 2 S eventually enters into dry gas, gasoline, liquefied petroleum gas and other products. If the desulfurization of these sulfur-containing products does not meet the standard, when used as petrochemical raw materials or fuels, it will cause corrosion of equipment and pipelines, and eventually cause environmental pollution, which will endanger human health. In recent years, with the development of the national economy, the demand for oil is increasing, which makes domestic refineries continue to increase the processing capacity of high-sulfur crude oil and low-quality crude oil, and a large number of sulfur-containing prod...

Claims

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Application Information

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IPC IPC(8): B01D53/52B01D53/78B01D53/96
CPCB01D53/52B01D53/78B01D53/96
Inventor 鄢烈祥孙珊珊史彬
Owner WUHAN UNIV OF TECH
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