Method for repairing main gas collecting tube of clean heat recovery coke-oven

Abstract

The invention relates to a method for preparing a main gas collecting tube of a clean heat recovery coke-oven, and the method comprises the following steps: a temporary connecting pipe is butt-jointed, welded and sealed with a coke side gas collecting tube and a machine side gas collecting tube respectively; the front top end of a burnout part of the main gas collecting tube is provided with an outlet of a protection wall, a binding molded bag which is filled with refractory material is put into the main gas collecting tube from the outlet of the protection wall, and the protection wall is built layer by layer; the middle-lower end of a side of the protection wall is provided with a repair entrance and exit, which is plugged when the repair of the main gas collecting tube is finished, andthen the outer surface of the repair entrance and exit after being plugged is welded and sealed with the main gas collecting tube; and the protection wall is disassembled, the outlet of the protection wall is plugged after the inside of the main gas collecting tube is cleaned up, and then the outer surface of the outlet of the protection wall after being plugged is welded and sealed with the maingas collecting tube. The burnout main gas collecting tube can be repaired without stopping the production of the coke-oven, the repairing cost is low, the coke-oven can be put into operation and the production can be restored in a short time, and the economic loss is low.

Description

technical field [0001] The invention belongs to a coke oven maintenance technology, and in particular relates to a maintenance method suitable for a main gas collecting pipe of a clean heat recovery coke oven. Background technique [0002] The general gas collecting pipe structure of the existing clean heat recovery coke oven, such as image 3 As shown, the outermost layer is the cylinder made of steel plates, the middle layer is the insulation layer of silicate board, and the innermost layer is the refractory layer of lightweight insulation bricks. Since the clean heat recovery coke oven mainly uses waste heat to generate electricity , The temperature of the flue gas determines the amount of power generation, so the temperature of the gas collector is generally 1000 ° C to 950 ° C. However, under high temperature conditions, the expansion coefficients of the iron sheet of the main air collecting pipe cylinder and the inner two layers of lining bricks are different, resultin...

AI Technical Summary

Problems solved by technology

However, under high temperature conditions, the expansion coefficients of the iron sheet of the main air collecting pipe cylinder and the inner two layers of lining bricks are different, resulting in cracks and falling off of the lining bricks, and the burning of the main air collecting pipe. The main air collecting pipe needs to be repaired

However, at present, the maintenance of the burnt main gas collecting pipe can only be repaired by taking measures to stop production of the coke oven, so that not only the maintenance cost is high, but also the economic loss is serious

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