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How to safely repair plumbing hot blast furnace equipment

Plumbing hot blast stove equipment must be maintained at any time, so as not to delay the normal use, today we introduce to you the safety repair method of plumbing hot blast stove:

1. When overhauling hot blast stoves, use blind plates or other reliable cutting devices to prevent gas from entering the adjacent gas pipelines and strictly implement the operation licensing system; gas protection personnel should be on site for monitoring.

2. During the internal overhaul and cleaning of hot blast stoves, the following provisions shall be observed:

1. The gas pipeline shall be insulated by blank plates. All valves except the flue valves shall be closed and the valve power shall be cut off.

2, the furnace should be well-ventilated, carbon monoxide concentration should be below 24ppm, oxygen content should be between 18% to 21% (volume concentration), every 2h should be analyzed once the gas composition.

3. When repairing the partition of the hot blast stove, the steel is used to support the partition to prevent the upper brick from falling off.

3. When the hot air pipe is overhauled, it should be opened to prevent gas hot air from entering.

The thermal regime directly reflects the thermal state of the hearth work. Some of the indicators of the thermal system are: one is the temperature of molten iron, which is usually between 1400 and 1500°C during normal hours. v It is commonly referred to as “physical heat”. Another indicator is the amount of silicon contained in iron. To insert). Because all the direct reduction, the heat of the hearth is not enough. The more conducive to the reduction of silicon, the higher the amount of pig iron containing c, so the amount of pig iron, the level of ancient silicon. Under certain conditions, it can indicate the temperature of the hearth, commonly known as "chemical heat":

First, the choice of thermal system

(1) According to the type of smelting pig iron, the size of the furnace, and the structure of the hearth, the coating range of the silicon content of pig iron is determined. When smelting steel, a blast furnace with a volume of 250-1000m3 is generally controlled at the furnace under normal working conditions. 45% o. 75% (for carbon block - ceramic cup structure of the furnace: if the furnace work is evenly active, learning control in o.35%-o. 65%), raw material conditions are too high blast furnace, pig iron content can be controlled In o. 25% a. 55%. (2) According to the content of other elements in the raw material to determine the amount of pig iron content Fan Tian: For example, when smelting vanadium iron ore, generally controlled in [T: 1t [Reconnaissance 2 = o. %% o. About 6%.

(3) According to the hearth: The lining condition determines the range of the pig iron containing silicon: In the late period of the furnace, the furnace wall erosion of the hearth changes to the bay, and when the water temperature difference rises south to reach the warning line, the quantity contained in the furnace is controlled at o. 85% to 125% (increase the carbon content of the right graphite after the pig iron is floated, which can form a protective layer and slow the erosion rate of the hearth furnace wall). If necessary, you can also refine the cast iron for a certain period:

(4) According to the hearth: [for the condition, the range of pig iron containing silicon is selected, the hearth work is even and active, and the silicon content of the pig iron can be lower; if the hearth builds up, the silicon amount of the pig iron table must be increased accordingly.

(5) When washing the furnace, it must be ensured that the furnace temperature is at o. 5% to one. o% range.