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Natural gas desulfurization process suitable for offshore floating platform

A desulfurization process and floating platform technology, applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of unsuitable natural gas sulfur recovery, large floor space, complex equipment, etc., to improve catalyst oxidation regeneration efficiency, equipment size Small, simple process effect

Inactive Publication Date: 2018-05-15
SICHUAN HENGRI GAS ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the onshore natural gas acid gas removal device is not suitable for natural gas sulfur recovery of offshore FLNG due to its complex equipment and large footprint.

Method used

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  • Natural gas desulfurization process suitable for offshore floating platform

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Embodiment 1

[0022] Such as figure 1 Shown: acid gas from boundary area (containing 25% H 2 S, mol%) enters reactor 1, contacts with trivalent complex iron catalyst countercurrently, following chemical reaction takes place:

[0023] h 2 S(g)+H 2 O→H 2 S(L)+H 2 O (1)

[0024] h 2 S(L)→H + +HS － (2)

[0025] HS － +2Fe 3+ L→S+2Fe 2+ L+H + (3)

[0026] o 2 (g)+H 2 O→O 2 (L)+H 2 O (4)

[0027] o 2 (L)+4Fe 2+ L+2H 2 O→4Fe 3+ L+4OH - (5)

[0028] In reactor 1, the temperature is 28-32°C, the pressure is 35-50kPa, the flow gas-liquid ratio is 0.56, and the residence time is 2min. Most of the H in the acid gas 2 S is oxidized to elemental sulfur, while ferric ions are reduced to ferrous ions. The acid gas that has been oxidized once is sent to the re-reactor 3 with the acid gas conveying fan 2, and is in countercurrent contact with the trivalent complex iron catalyst to further remove the possible residual H in the gas 2 S, the purified gas is sent to the boundary area...

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Abstract

The invention relates to the field of natural gas chemical industry, in particular to a natural gas desulfurization process suitable for an offshore floating platform. The natural gas desulfurizationprocess comprises a reactor, a re-reactor and a centrifugal machine; acid gas coming from a boundary region is directly introduced into the reactor, a trivalent complex iron catalyst enters the re-reactor, the trivalent complex iron catalyst at the bottom of the re-reactor enters the reactor under the control of a valve and a pipeline, a chemical reaction is then carried out, divalent complex ironobtained by means of the reaction is centrifuged, the divalent complex iron is conveyed to an electrochemical regeneration device by means of a regenerative feed pump so as to complete the regeneration, and the regenerated trivalent complex iron catalyst is returned to the re-reactor by means of a circulation pump. The natural gas desulfurization process is simple in technological process, smallin equipment size and compact in structure, and adapts to the condition limit of limited production space of offshore floating liquefied natural gas (FLNG).

Description

technical field [0001] The invention relates to the field of natural gas chemical industry, in particular to a natural gas desulfurization process suitable for offshore floating platforms. Background technique [0002] H often found in natural gas 2 S, CO 2 Such acidic components will seriously corrode containers, pipelines and other related facilities. If the discharge is lower than the safety standard, it will cause serious harm to the environment and human body; it contains more H 2 When the natural gas of S is burned, there will be peculiar smell, and the SO produced by burning 2 Compounds such as sulfur will pollute the environment; in catalytic processing, sulfur-containing hydrocarbons will poison the catalyst. In offshore FLNG production systems, one of the most important tasks in natural gas pretreatment is acid gas removal. However, the onshore natural gas acid gas removal device is not suitable for the natural gas sulfur recovery of offshore FLNG due to its co...

Claims

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Application Information

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IPC IPC(8): C10L3/10
CPCC10L3/103
Inventor 张丽何琎孙琪宁蕾
Owner SICHUAN HENGRI GAS ENG CO LTD
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