Method for recycling acetylene from slag slurry

Abstract

A method for recycling acetylene from slag slurry comprises the steps that a vacuum desorption method is adopted to recycle acetylene gas, generator overflow is sent to a slag slurry tank through an airtight pipeline and then sent to a desorption tower through a slag slurry pump, and low pressure boiling desorption is conducted on carbide-slag slurry in the desorption tower; after the desorped acetylene gas is sent to a cooler to be cooled, the acetylene gas is sent to a steam-water separator through a water ring vacuum pump, a part of the acetylene gas enters an acetylene heat exchanger and enters an oxygen meter after being cooled, and if the measured oxygen content is higher than 1.8%, the acetylene gas opens an emptying valve and is emptied through a fire barrier; if the measured oxygen content is lower than 1.8%, the acetylene gas is sent to an acetylene header pipe to enter a gas cabinet through an acetylene buffer tank and a flow meter. Desorbed slag slurry enters a slag slurry buffer tank from the bottom of the desorption tower and is pumped to a thickener through a slag slurry buffer pump. According to the method for recycling the acetylene from the slag slurry, running of the technology is stable, and the benefit is obvious. Meanwhile, a generator overflow pipeline is airtight, and the problem that an original overflow well is openair and not safe is solved.

Description

technical field [0001] The invention relates to a device for recovering acetylene gas from calcium carbide slurry in the production process of calcium carbide polyvinyl chloride. Background technique [0002] In the process of producing acetylene gas by the calcium carbide method, the acetylene generator in the original production process needs to continuously add water to the generator in order to prevent the reaction temperature from being too high, and in order to control the liquid level, it is necessary to pass the excess slurry water through the overflow pipeline The acetylene content in the discharged slurry is generally in the range of 300-400mg / kg. The slurry pipeline is an open pipeline, and a large amount of acetylene gas will be discharged into the atmosphere with the discharge of calcium carbide slurry, which not only pollutes the environment, but also brings pollution to the enterprise. There are also certain security risks. Contents of the invention [0003...

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Problems solved by technology

[0002] In the process of producing acetylene gas by the calcium carbide method, the acetylene generator in the original production process needs to continuously add water to the generator in order to prevent the reaction temperature from being too high, and in order to control the liquid level, it is necessary to pass the excess slurry water through the overflow pipeline The ace

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