Safe pipeline conveying method for acetylene-rich C4 rich in high-concentration vinyl acetylene

Abstract

The invention discloses a safe pipeline conveying method for acetylene-rich C4 rich in high-concentration vinyl acetylene. The safe pipeline conveying method comprises the following steps that firstly, high-alkyne tail gas and non-acetylene C4 tail gas are respectively cooled, the high-alkyne tail gas is diluted by using the non-acetylene C4 tail gas, and then mixed gas enters a mixed gas storage tank; then, a plurality of middle conveying buffer units are arranged between the mixed gas storage tank and a conveying terminal; and acetylene-rich C4 is safely conveyed in a segmented conveying mode. Each middle conveying buffer unit comprises a conveying pipeline, a middle buffer tank, a conveying pump and a cooling heat exchanger, an electric heat tracing heat preservation layer is arranged on the outer wall of each conveying pipeline, and a temperature sensor is arranged on each pipeline to monitor the temperature. Through comprehensive and specialized management and control of the vinyl acetylene concentration of acetylene-rich C4, the pipeline conveying pressure and the conveying temperature, safe, long-distance and convenient pipeline conveying can be achieved.

Description

technical field [0001] The invention relates to a method for transporting alkyne-rich C4, in particular to a safe pipeline transportation method rich in high-concentration vinylacetylene-rich C4. Background technique [0002] With the continuous deepening of petrochemical processing, the rational utilization of components in the by-product C4 fractions of liquefied petroleum gas, oilfield associated gas, oil refining units and ethylene cracking units has attracted increasing attention. The C4 fraction is rich in alkynes such as vinyl acetylene and ethyl acetylene. These substances are prone to decomposition and explosion when the concentration exceeds a certain level. Among them, vinyl acetylene is the most dangerous. Studies have shown that when the concentration of vinyl acetylene reaches or exceeds 80 %, decomposition and exothermic reactions begin to occur at 140°C, and will explode when the temperature reaches 165°C. At present, the production enterprises of alkyne-ric...

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Problems solved by technology

At present, the production enterprises of alkyne-rich C4, such as Shandong Binqing New Energy and Anhui Haide, etc., mainly transport these raw materials by vehicles, and do not fully consider the safety requirements of vinyl acetylene in the process of loading and unloading and transportation. At the same time, there is no safe pipeline transportation technology for high-concentration vinyl acetylene-rich alkyne carbon four in China

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