A device and method for recovering C2C3 in refinery dry gas by oil absorption and rectification
A refinery dry gas, carbon two carbon three technology, applied in the direction of absorption purification/separation, processing of gas mixture, treatment of hydrocarbon oil, etc., can solve the problems of high energy consumption and large investment, and achieve low energy consumption and low investment , the effect of simple operation
Active Publication Date: 2021-03-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0009] In order to solve the problem of large investment and high energy consumption caused by the separation of C2C3 components in the product gas when recovering C2C3 in the dry gas in the existing refinery dry gas recovery process, the present invention proposes a Device and method for efficiently recovering C2C3 in refinery dry gas by oil absorption and rectification
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Embodiment 1
[0049] The composition of coking dry gas and aromatics dry gas in a refinery is shown in Table 1.
[0050] Table 1 Refinery dry gas flow composition
[0051] Coking dry gas 1 Aromatic dry gas 4 temperature, °C 40 10 Pressure, MPaG 0.80 0.30 Mass flow, t / h 20 10 Composition, mol% H 2
11.00 16.00 CO 0.00 0.00 CO 2
0.00 0.00 N 2
0.30 0.00 O 2
0.20 0.00 CH 4
59.80 2.00 C 2 H 6
22.00 70.00 C 2 H 4
3.00 0.00 C 3 H 8
0.50 10.00 C 3 H 6
0.50 0.00 n-C 4 H 10
0.50 0.6 i-C 4 H 10
0.50 0.00 C 4 H 8
0.50 0.00 n-C 5 H 12
0.25 0.40 i-C 5 H 12
0.25 0.00 benzene 0.00 1.00 H 2 O
0.70 0.00
[0052] The above-mentioned refinery dry gas is separated by using the device and method for recovering C2C3 in refinery dry gas by the oil absorption and rectification metho...
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The invention belongs to the technical field of refinery dry gas separation and recycling, and relates to a device and a method for recycling carbon 2 and carbon 3 in refinery dry gas by the aid of oil absorption and rectification processes. The device comprises an aromatic hydrocarbon dry gas treatment system and a coking dry gas treatment system. The aromatic hydrocarbon dry gas treatment systemcomprises an aromatic hydrocarbon dry gas compressor, an ethane tower and a light hydrocarbon tower, the aromatic hydrocarbon dry gas compressor, the ethane tower and the light hydrocarbon tower aresequentially arranged along a material flow direction, and the aromatic hydrocarbon dry gas compressor comprises at least two sections; the coking dry gas treatment system comprises a coking dry gas compressor, a coking dry gas cooler, an absorption tower and a desorption tower, the coking dry gas compressor, the coking dry gas cooler, the absorption tower and the desorption tower are sequentiallyarranged along the material flow direction, and a tower top of the desorption tower is arranged between the sections of the aromatic hydrocarbon dry gas compressor in a connected manner. The device and the method have the advantages that the contents of light components such as hydrogen and methane in materials fed into the ethane tower can be reduced by the aid of the method, the tower top temperature of the ethane tower can be increased, ethane-rich gas in products can be delivered to ethane pyrolysis furnaces of ethylene devices to be used as a raw material, light hydrocarbon in the products can be delivered to propane dehydrogenation devices to be used as a raw material, dryers or propylene refrigeration compressors can be omitted, and accordingly the investment and energy consumptionof the device can be reduced.
Description
technical field [0001] The invention belongs to the technical field of refinery dry gas separation and recovery, and more particularly relates to a device and method for recovering carbon two carbon three in refinery dry gas by oil absorption and rectification. Background technique [0002] Refinery dry gas comes from secondary processing of crude oil, such as delayed coking unit dry gas, aromatics combined unit dry gas, etc. The dry gas usually contains a large amount of carbon two carbon three components, such as the ethane molar content in the coking dry gas is about 10-24%, and the dry gas of the aromatic hydrocarbon unit, such as the PX unit dry gas, when the ethane molar content is high. It reaches 25-70%, and the propane content is about 5-25%. At present, the refinery dry gas is mainly burned as fuel, and its utilization value is low. If the carbon two carbon three components in the dry gas are recovered, the recovered ethane-rich gas is sent to the ethane cracking...
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IPC IPC(8): C10G70/00C10G70/06C07C7/11C07C7/04C07C9/06
Inventor 邵华伟李春芳李东风过良田峻刘智信
Owner CHINA PETROLEUM & CHEM CORP