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Process for recovering liquefied petroleum gas from dry distillation tail gas of oil shale

A liquefied petroleum gas and tail gas recovery technology, which is applied in the petroleum industry, special dry distillation, gas fuel, etc., can solve problems such as pollution and shale semi-coke utilization, and achieve good economic benefits, increase added value, and reduce production costs. Effect

Inactive Publication Date: 2009-12-09
DALIAN UNIV OF TECH
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Problems solved by technology

It can be seen from the above process that the process does not utilize shale semi-coke, causing pollution

Method used

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  • Process for recovering liquefied petroleum gas from dry distillation tail gas of oil shale

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Embodiment Construction

[0017] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0018] The specific implementation of the present invention is to fully recover and extract C3 and heavy components above C3 in the dry distillation tail gas to obtain LPG and naphtha products under the premise of ensuring sufficient heat supply to the heating furnace. For this reason, the technical process of compression unit 20, absorption unit 21, pre-desorption unit 18, and desorption unit 19 is designed. The dry distillation tail gas at 80°C is pressurized into the dry distillation tail gas cabinet 16 to be buffered and stabilized, and then mixed with the enriched gas from the absorption unit 21. The absorption oil and the pre-desorption gas from the pre-desorption unit 18 are mixed, and enter the condensed oil tank 17 after being cooled. The condensed oil enters the tower from the top of the pre-desorption towe...

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Abstract

The invention discloses an improved comprehensive utilization process for producing oil by oil shale by graded dry distillation as well as recovering and extracting liquefied petroleum gas (LPG) from dry distillation tail gas, which is the improvement on the prior process, namely a gas full-cycle oil shale graded dry distillation process and a device thereof. Oil gas produced from the oil shale through dry distillation passes through a water scrubbing tower, an electrostatic oil trap and an oil-water separation tank to produce the shale oil; and the dry distillation tail gas utilizes the process to recover the LPG, and residual cold gas enters a circulating gas heating furnace. The process has the advantages that the process recovers the LPG, reduces a calorific value of the gas for combustion when the oil shale has lower quality, possibly cannot meet the heat supply demand of the heating furnace, and can reserve an interface on the heating furnace through which the shale oil is returned to combust to supplement the heat. The process has high comprehensive utilization degree, fully recovers the LPG in the dry distillation tail gas, and increases the gain.

Description

technical field [0001] The invention belongs to the technical field of comprehensive development and utilization of new energy, and relates to a process for recovering liquefied petroleum gas (LPG) from oil shale dry distillation tail gas. Background technique [0002] At present, the domestic oil shale retort process products are basically: fuel oil, low calorific value gas and shale ash, such as the Fushun generation furnace retort process: in this process, the retort product at the outlet of the retort furnace passes through the condensation recovery system to obtain page Rock oil and dry distillation gas. The dry distillation gas is divided into three parts: one part is sent to the regenerative heating furnace for heating, as the circulating gas of the dry distillation furnace; the other part is used as the fuel for the regenerative heating furnace; the remaining part is used by the gas boiler (Gao Jian, oil shale carbonization technology in various countries in the worl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/06C10L3/12
Inventor 王克峰张志范孙凯吴启成王鸿治韩志忠刘爽
Owner DALIAN UNIV OF TECH
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