Sawtooth closed type construction method for cracking furnace area of large ethylene device

Abstract

The invention relates to a sawtooth closed construction method for a cracking furnace area of a large ethylene device, which comprises the following steps of: dividing cracking furnaces which are sequentially mounted side by side into a first construction group with an odd number and a second construction group with an even number, mounting furnace bodies in the first construction group according to the mounting positions of the furnace bodies, and forming sawtooth-shaped intervals among the cracking furnaces; in the second construction group, the furnace bodies are assembled in sections in the prefabrication site, and pipelines on one side or multiple sides of the cracking furnace in the second construction group are installed in the prefabrication site at the same time; pipeline penetration on one side or multiple sides of the cracking furnace in the first construction group is completed; and the second construction group is transported to the construction site from the prefabrication site, and then is installed in place in the sawtooth-shaped intervals formed by the cracking furnaces of the first construction group. After the cracking furnace body of the first construction group is installed in place, a hoisting operation area can be formed between every two furnaces, the operation radius of pipeline penetrating installation is reduced, vertical transportation can be conducted by being matched with an applicable winch, and therefore the construction efficiency is improved.

Description

technical field [0001] The invention belongs to the field of building construction, and in particular relates to a sawtooth occlusal construction method in the cracking furnace area of ​​a large-scale ethylene plant. Background technique [0002] Ethylene is one of the chemical products with the largest output and consumption in the world, and is known as the "mother of the petrochemical industry". Ethylene production capacity is one of the important indicators to measure the development level of a country's petrochemical industry. At present, the dominant process is steam cracking, accounting for more than 95% of production capacity. The steam cracking process occupies an important position with the advantages of low equipment investment, simple product scheme, low cost and high ethylene yield. [0003] The cracking furnace area of ​​the ethylene project is the core of the entire ethylene plant, and the construction is difficult. The installation of the cracking furnace ...

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Problems solved by technology

[0004] Currently, if figure 2 As shown, the construction method for the installation of the cracking furnace area of ​​the large-scale ethylene project is to first install the cracking furnace body in sections, install the steel structure of the furnace pipe gallery at the same time, and finally install the process pipes of the furnace pipe gallery and the process pipes of the furnace body. A 300-ton crawler crane and a 160-ton truck crane are used for the installation of the process pipeline, which are respectively located on the north side of the furnace and the south side of the furnace pipe gallery. Due to the narrow distance between the cracking furnaces and the gap between the furnace front pipe gallery and the cracking furnace The distance between them is too narrow to use hoisting equipment, so they can only be hoisted on the north side of the furnace and the south side of the furnace front pipe gallery, which increases the hoisting operation radius. During the peak period of hoisting operations, four 300-ton crawler cranes, 12 sets of 160-ton truck cranes for operation

[0005] The disadvantage of the above construction method is that the cracking furnace body and the steel structure of the furnace front pipe gallery are installed and then the process pipes are installed. In this way, the pipes located on the south, southwest, and southeast sides of the furnace and the pipes on the north side of the furnace front pipe gallery are As the working radius increases, large-scale hoisting machinery must be used for the installation of process pipes, and the construction progress is slow

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