Systems and methods for utilizing refinery dry gas
A refinery dry gas and refrigeration system technology, applied in the petrochemical industry, can solve the problems affecting the purity of downstream products, high operating costs, and low concentration, and achieve the effects of reducing investment and operating costs, improving economy, and making full use of it
Active Publication Date: 2017-12-05
BEIJING ZHONGKE RUIAO ENERGY TECH CO LTD
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Problems solved by technology
However, the concentration of each component in the refinery dry gas is not high, and it contains a large amount of inert gas that is useless to the downstream process. The direct use operation cost is relatively high, and even affects the purity of downstream products.
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Embodiment Construction
[0038] Such as figure 1 Shown, the system utilizing refinery dry gas of the present invention comprises:
[0039] A first-stage plate-fin heat exchanger 121 used for cooling the refinery dry gas;
[0040] The first gas-liquid separator 131, which is used to perform preliminary separation treatment on the cooled refinery dry gas to separate the first liquid phase flow from the first gas phase flow in the refinery dry gas, is connected with the first stage plate The fin heat exchanger is connected by pipeline;
[0041] The first rectification column 141 for finely separating the first liquid-phase flow to separate the first liquid-phase flow into the second liquid-phase flow including C2 and C3 and the second gas-phase flow, and the first gas-liquid flow The separator is connected by pipeline;
[0042] A second rectification tower 142 for finely separating the second liquid phase flow is connected with the first rectification tower through a pipeline;
[0043] A secondary pl...
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The invention relates to a system and a method utilizing refinery dry gas. The system utilizing the refinery dry gas comprises a first-stage plate-fin heat exchanger, a gas-liquid separator, a first rectifying tower, a second rectifying tower, a second-stage plate-fin heat exchanger, a third rectifying tower, a fourth rectifying tower, a first refrigeration system, a second refrigeration system and a third refrigeration system. The method utilizing the refinery dry gas comprises the steps of cooling the refinery dry gas; performing preliminary separation on the cooled refinery dry gas; performing fine separation on first liquid flow; performing fine separation on second liquid flow; cooling first gas flow and second gas flow. According to the technical scheme, refrigerants in different temperature areas are respectively used for cycle refrigeration, and the multicomponent separation sequence is optimized, so that the effect that all components of the refinery dry gas are classified and extracted and are respectively utilized is achieved, resources are fully used, additionally, the investment and operating cost is reduced as far as possible, and the economy is increased.
Description
technical field [0001] The invention relates to the field of petrochemical industry, in particular to a system and method for utilizing refinery dry gas. Background technique [0002] Refinery dry gas refers to the non-condensable gas produced during the refining process, which mainly comes from the secondary processing of crude oil, such as heavy oil catalytic cracking, delayed coking, etc. Among them, catalytic cracking produces the largest amount of dry gas. The composition of refinery dry gas is complex, and the composition of dry gas produced by different process units is also different, mainly including ethylene, propylene, methane, ethane, propane, butane, hydrogen, nitrogen, carbon monoxide, carbon dioxide, and trace impurities of sulfur and mercury . [0003] Refinery dry gas is usually used as fuel gas, or even sent to flare for direct burning. With the advancement of technology and the improvement of people's awareness, everyone has gradually realized that the r...
Claims
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IPC IPC(8): F25J3/02
CPCF25J3/0219F25J3/0233F25J3/0257F25J3/0276F25J2200/10
Inventor 侯国建丁胜军
Owner BEIJING ZHONGKE RUIAO ENERGY TECH CO LTD