Steam thermal cracking simulation experiment device and process

Abstract

The invention provides a steam thermal cracking simulation experiment device and process. The steam thermal cracking simulation experiment device comprises a raw material feeding device, a cracking furnace and a product quenching recovery device which are sequentially connected; the product quenching recovery device comprises a direct quenching system and a circulating quenching recovery system; the circulating quenching recovery system comprises a cracked gas circulating quenching loop composed of a gas-phase mixer, an indirect quencher, a cyclone separator, a gas circulating pump and a cooler; the gas-phase mixer is connected to a cracking furnace pipe discharging hole in a sealing way; the direct quenching system is used for vertically inserting a quenching water injection pipe in the cracking furnace pipe discharging hole through the center inside the gas-phase mixer; a water injection hole is formed in the end of the inserted end; and quenching water is injected into a cracking furnace pipe by the water injection hole. The steam thermal cracking simulation experiment device has the advantages that high-temperature cracked gas is directly quenched twice after being sequentiallyinjected with the quenching water and a circulating gas product, so that the cooling efficiency is high, the injection quantity of the quenching water is small, secondary reaction of the cracked gascan be effectively avoided, and the accuracy of a simulation effect of the cracking furnace is improved.

Description

technical field [0001] The invention relates to a steam thermal cracking simulation experiment device and a process, in particular to a steam thermal cracking simulation experiment device with a novel product quenching recovery device and a process for using the device to conduct a simulation cracking experiment. Background technique [0002] The trienes (ethylene, propylene, butadiene) and triphenyls (benzene, toluene, xylene) produced by the ethylene plant are the basic raw materials of the petrochemical industry and play a pivotal role in the petrochemical industry. At the same time, the level of ethylene production is It is an important symbol to measure the development level of a country's petrochemical industry. According to statistics, about 95% of ethylene and more than 50% of propylene in the world are produced by steam pyrolysis. At present, it has become one of the development trends of ethylene production to continuously improve the operation level of ethylene pl...

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Problems solved by technology

[0004] At present, the product quenching recovery device of the steam thermal cracking simulation experiment device is generally refrigerated in series by multi-stage indirect quenchers. Patent CN 204111681U discloses a steam thermal cracking simulation experiment device. The quencher of the steam thermal cracking simulation experiment device includes sequentially connected The first cooler and the second cooler, the first and second coolers respectively include a shell and a cracked gas pipeline installed in the shell, the cooling water flow space is between the shell and the cracked gas pipeline, and it comes out from the cracking furnace tube The temperature of the high-temperature pyrolysis gas is reduced to 200-300°C after passing through the quench cooler, and then cooled to 3-5°C after passing through the two-stage water cooler and semiconductor refrigerator. Although the axes of the cracking gas pipelines of the first and second coolers are set to Having an included angle can make the decoking operation faster and more convenient, but its cooling efficiency is not high and the subsequent product separation and recovery needs to add multi-stage coolers, resulting in a large volume of the entire simulation experimental device, and it is inconvenient to disassemble and repair.

And if select to inject quenching water into cracking furnace tube and carry out direct quenching, improve cooling efficiency and save space, but need to inject the quenching water of about 2-3 times raw material oil feed rate to cracking furnace tube just can cracking gas temperature from 800-900°C instantly drops to 40-55°C, introducing a large amount of quenching water will cause pressure and temperature fluctuations in the furnace tube, and increase the load of subsequent indirect quenching and separation devices, which is not conducive to the oil-water separation of the collected liquid phase products; at the same time In the long-term test, a large amount of quenching water will be cooled and recycled to the cracking liquid product storage tank, and the intermittent emptying of the cracking liquid phase product storage tank will cause pressure fluctuations in the entire simulation device system, affecting the normal experimental operation of the simulation device

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