A Method of Alignment in the Air After Installation of Suspension Boiler Steam Drum

Abstract

The invention discloses a method for aerially aligning a suspension type boiler drum after installation and belongs to the technical field of metallurgy equipment installation and construction. The method comprises the steps that preparation work is performed, wherein a stopping block is welded, positioned and guided, and suspension rod bases are reinforced; horizontal displacement is performed, wherein rolling rods are sequentially added at the bottoms of the suspension rod bases, and a steam drum is moved to a designated place through a jack; elevation is adjusted, wherein steel cushion plates are sequentially cushioned at the lower portions of the suspension rod bases; radial rotation is performed, wherein one end of the steam drum is held by utilizing a large caterpillar track crane, the other end of the steam drum is suspended through a chain block, and the steam drum is turned by tightening or loosening the chain blocks on two sides of the steam drum; finishing work is performed, auxiliary parts are cut away, and the steel cushion plates and the suspension rod bases are integrally welded on a steel structure girder. The steam drum aligning work can be rapidly and effectively performed by adopting the method, a steel structure does not change, the method does not need multiple large cranes or tower cranes for work, the process is simple and easy, the method is simple and effective, a hoisting space is saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of installation and construction of metallurgical equipment, and more specifically relates to a method for aligning in the air after installation of a suspended boiler steam drum. Background technique [0002] The Panama Copper Mine Project was funded by Panama Mining and First Quantum, and the construction of the main part of the power station boiler was completed independently in accordance with ASME requirements. The scale of the boiler construction is mainly steam output of 451 tons per hour, and the output power of the steam turbine is 150MW. The net weight of the boiler steam drum of the PACO power station project is 128.9 tons, the length is 15180mm, the outer diameter is 1973mm, the material of the steam drum body is SA302-C, and the wall thickness is 144mm. The final position of the steam drum after installation is the suspension type. The two ends of the steam drum are suspended on the steel struct...

AI Technical Summary

Problems solved by technology

The steam drum is a special equipment, and the manufacturer of the steam drum usually sends professionals to guide the installation during installation on the construction site. and crane performance requirements, First Quantum usually arranges relevant units to temporarily install the steam drum in order to continue the follow-up installation of other steel structures and avoid delays in the construction progress. However, in this way, the steel around the steam drum The structure has been installed in place. At this time, if multiple cranes are used to re-lift the steam drum and realize the alignment of the steam drum, it will undoubtedly bring great difficulty, because the steel structure on site has been constructed. If multiple cranes are used When the crane is re-hoisted, the steel structure needs to remove the attached spans and operating platforms on both sides. The workload is huge. Regardless of the hoisting time of the steam drum and the crane shift, it is estimated that the dismantling of the structure and the reinstallation of the gas supply will take more than half a month. It will inevitably affect the construction period and economic benefits. According to this actual situation, it is impossible to meet the conditions for secondary hoisting with two large crawler cranes without dismantling a large number of steel structures and subgrade treatment in the crane station area. The following problems often exist when hoisting in place: 1) There is a radial horizontal deviation in the temporarily installed steam drum, and the horizontal displacement is difficult. The steam drum is suspended on the steel structure girder by two U-shaped suspenders. If you walk directly on the steel structure girder, a slight deviation of the suspender base will cause the deformation of the steel structure girder, which will seriously affect the follow-up work; After it is in place, it will be connected with other connected parts. A large part of the weight of the connected parts will be borne by the steam drum, so that the elevation of the steam drum will sink. At this time, the steel structure around the steam drum greatly limits the hoisting space of the steam drum. It is not convenient for the use of large mechanical cranes or tower cranes; 3) There is a center deviation in the temporary steam drum, and it is difficult to rotate the steam drum radially, because the steam drum is in direct contact with the U-shaped boom, and when the steam drum is directly rotated by a crane , will cause a lot of static friction between the steam drum and the U-shaped boom, and the U-shaped boom has a small stress surface, which may damage the boom, and the speed and size of the steam drum when it rotates are also very large. Difficult to control, these will undoubtedly bring great difficulty to the alignment of the steam drum, and if the steam drum is not aligned, it will greatly affect the normal use of the steam drum

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