Thermal-state lining repairing method for coke oven ascending pipes and spray repairing material thereof

Abstract

The invention discloses a thermal-state lining repairing method for coke oven ascending pipes. The thermal-state lining repairing method includes: inspecting before spray repairing, choosing and cleaning an ascending pipe to be repaired and performing spray repairing. A spray repairing material for the thermal-state lining repairing method of the coke oven ascending pipes includes, by weight, 55-75% of flint clay (or synthetic mullite grains or high-aluminum bauxite), 10-25% of high-aluminum cement, 4-8% of expanding agent, 4-6% of soft clay powder, 5-10% of aluminum oxide micropowder and 0.3-1.0% of additive, wherein the expanding agent is kyanite, and the additive is naphthalene sulfonic-formaldehyde condensates. The thermal-state lining repairing method is fast and convenient in repair, and the spray repair material has good caking property and excellent packing capability and has fairly high refractoriness and breaking strength.

Description

technical field [0001] The invention belongs to the maintenance technology of coking equipment, in particular to a method for repairing the inner lining of a coke oven rising pipe in a hot state and a gunning material thereof. Background technique [0002] The rising pipe is installed on the top of the coke oven to lead out the raw gas in the carbonization chamber. The cylinder body of the rising pipe is made of steel plate, and the inner lining is made of refractory material. The riser pipe, the second is to prevent the high-temperature raw gas from directly contacting the steel plate, causing the riser pipe to deform and collapse when the temperature rises, and causing the furnace top temperature to be too high to seriously deteriorate the operating environment; after a period of use, the refractory material lining the riser pipe On the top, especially at the root, a large amount of graphite and floating ash will accumulate, which will make the circulation channel of raw g...

AI Technical Summary

Problems solved by technology

[0002] The rising pipe is installed on the top of the coke oven to lead out the raw gas in the carbonization chamber. The cylinder body of the rising pipe is made of steel plate, and the inner lining is made of refractory material. The riser pipe, the second is to prevent the high-temperature raw gas from directly contacting the steel plate, causing the riser pipe to deform and collapse when the temperature rises, and causing the furnace top temperature to be too high to seriously deteriorate the operating environment; after a period of use, the refractory material lining the riser pipe On the top, especially at the root, a large amount of graphite and floating ash will accumulate, which will make the circulation channel of raw gas smaller. Therefore, it is necessary to clean the inner lining of the riser pipe every shift, because the steel brazing is used to clean the inside of the riser pipe for a long time. Material hanging on the lining, poor management of the water seal of the rising pipe cover, and water flow to the lining, etc., cause the lining of the rising pipe to crack and peel off, cause the straight pipe of the rising pipe to burn out at high temperature, deform or even tilt, and make the raw gas generated in the carbonization chamber The output is difficult, causing smoke and fire from the rising pipe and the socket of the bridge pipe, which affects the service life of the coke oven and the treatment of "disorganized emission" of the coke oven; after the lining of the rising pipe is peeled off and damaged, it is usually directly replaced with a new one. The riser of the lining is replaced as a whole. This traditional repair method has the following problems: (1) The time for each replacement is too long, usually 2 to 4 hours, which not only affects the normal production of the coke oven, but also causes focus (2) The maintenance cost and cost of replacing the riser are relatively high, especially for large-volume coke ovens that require cranes and more maintenance personnel to cooperate with the operation, and most of the riser linings are Only part of the peeling off has to be replaced as a whole, resulting in large waste and high cost; (3) The technical requirements of the replacement plan are complicated, and special equipment such as cranes are required to cooperate with the operation, and the operation safety factor is low