Exchanging method of exhaust-heat boiler low temperature economizer

Abstract

The present invention relates to an exchanging method of an exhaust-heat boiler low temperature economizer, characterized in that the method comprises the following steps: (1) dismantling an old low temperature economizer module; (2) mounting a hoisting support, wherein the hoisting support is mounted under the low temperature economizer, and an upper end face of an upper rolling bar of the hoisting support is slightly higher than an angle iron at the lower part of the support; (3) hoisting and dragging, wherein a lifting hook of a crane is connected to partial lifting lugs on the top face of a new low temperature economizer by a sling; the new low temperature economizer is partially fed into the support from a gap at a first side face of the support; the lugs at the top face of the new low temperature economizer are connected by a chain block, and dragged along the first side to a second side face in the gap of the second side face opposite to the first side face of the support in a way of matching with the hoisting of the crane; (4) dismantling the hoisting support; compared with the prior art, in the present invention, the new low temperature economizer module can be exchanged without dismantling various modules disposed above the low temperature economizer module, so that construction period and construction cost are saved greatly; simultaneously, convenient conditions are supplied for the future operations.

Description

technical field [0001] The invention relates to a waste heat boiler, in particular to a method for replacing a waste heat boiler economizer. Background technique [0002] The waste heat boiler used in the oil refining unit includes, from top to bottom, a high temperature superheater module, a low temperature superheater module, a water injection desuperheater module, an evaporation section module, a high temperature economizer module and a low temperature economizer module. Place them in the corresponding brackets, and stack the brackets together with the modules in them during installation. The bracket is usually a cubic frame made of angle steel, and the edges of each module are just within the right angle of each angle steel that constitutes the frame. Since the economizer is located at the bottom of the waste heat boiler, the high temperature flue gas from the gas turbine first passes through the economizer, so the low temperature economizer is the most prone to failure...

AI Technical Summary

Problems solved by technology

Due to the large volume and weight of each module, a large crane is required for disassembly and installation, which requires a long replacement period, heavy workload, and very high cost

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