A kind of off-line oven method of hot blast stove

Abstract

The application provides an off-line oven drying method for a hot blast stove, which relates to the technical field of hot blast stove maintenance. The offline oven drying method of the hot blast stove includes: laying the first pipeline between the first manhole and the chimney, setting the oven burner in the second manhole, laying the second pipeline between the oven burner and the gas main pipe, closing the The gas inlet, auxiliary gas inlet, waste gas discharge port and burner of the hot blast stove deliver gas to the oven burner through the second pipeline, and deliver auxiliary gas to the oven burner through the inspection hole or the auxiliary gas pipeline. The oven burners are combusted, and the exhaust gas produced is transported to the chimney through the first pipe. By adjusting the intake rate of gas and supporting gas and the exhaust rate of exhaust gas, the temperature rise rate of the hot blast stove is controlled to be 1-4°C / h. This oven method can separate the hot blast stove to be repaired from the hot blast stove system. And strictly control the heating rate of the hot blast stove to prevent the silicon bricks in the high temperature part of the hot blast stove from being damaged and collapsed during the oven.

Description

technical field [0001] The present application relates to the technical field of hot blast stove maintenance, and in particular, relates to an off-line oven drying method of a hot blast stove. Background technique [0002] In the on-line emergency repair of silica brick hot blast furnace, the temperature control of the furnace is highly required, especially before 700°C, the temperature rise is usually controlled at 2-3°C per hour. If the existing air and gas system of the hot blast stove is used for baking, since the combustion valve and the shut-off valve are both gate valves, the regulating valve (butterfly valve structure) also has a certain leakage rate like the gate valve, and the temperature control accuracy effect cannot reach the baking temperature. A small increase in temperature in the furnace is required. [0003] The same waste gas valve also has a certain leakage rate. In the early stage of the oven, because the amount of flue gas generated is very small, if t...

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Problems solved by technology

[0003] The same waste gas valve also has a certain leakage rate. In the early stage of the oven, because the amount of flue gas generated is very small, if the flue valve is opened to discharge waste gas, the amount of waste gas in the flue main pipe (normally fired by 2 or more hot blast stoves) is greater than If the exhaust gas volume of the oven cannot achieve a good negative pressure effect, the exhaust gas in the flue main pipe will be poured into the hot blast stove of the oven, resulting in the failure of the oven.

If in order to ensure a good negative pressure state in the flue main pipe, it is necessary to fully open the waste heat recovery flue bypass valve, but it will cause the temperature of the air and gas to drop significantly after preheating, which will affect the normal firing and air temperature of the hot blast stove, and the gain outweighs the gain

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