How to adjust the cooling and heating temperature of blast furnace

Furnace temperature adjustment is to take measures to adjust the heat balance of blast furnace smelting according to the influence of external conditions on furnace temperature. Under the condition of oxygen-enriched coal injection in blast furnace, the operation sequence is adjusted as follows: 1. Heating: reducing pulverized coal-adding oxygen-adding air-reducing air to cool coke; 2. cooling: adding coal powder-reducing oxygen-increasing air-cooling and supplementing coke; 1. Adjustment of furnace temperature during cooling: 1. When the air temperature has room, we should make full use of the stove first. Make the coal injection rate of each batch of materials higher than normal 10-20%. 3. After adding pulverized coal, the material velocity still exceeds the normal level. Oxygen-enriched blast furnace can first reduce oxygen or shut down the furnace (oxygen can't be stopped when the injection quantity is large) or reduce the air of the fan 10%-20%. 4. If the block still can't stop, it is necessary to decisively reduce the air by 20%-30% to make the material. Coke should be added temporarily or the coke load should be reduced. 6. The iron content of raw materials and the ash content of coke should be improved, and the coke load should be reduced according to regulations. 7. The raw material weighing equipment is not allowed to be at zero, so it should be quickly adjusted to normal, and the load should be adjusted in time according to the size of the error. 8. When the moisture content of coke increases (generally 3%-4%), coke should be replenished according to regulations. 9. The tuyere leakage should be handled and replaced in time. The cooling equipment leaks, and the water quantity should be controlled. When the leakage is serious, when the furnace temperature is continuously lower than the prescribed lower limit, coke should be temporarily added to prevent severe cooling, and then the load should be adjusted. Second, when the furnace is warm, adjust it to 1. When the furnace condition is slow-heating, the amount of pulverized coal should be reduced first, and the amount of coal injection per batch should be reduced to make it lower than the average amount of coal injection per batch at normal furnace temperature. 2. When the feeding speed is still slow after reducing pulverized coal, if there is residual oxygen, 0.5%- 1.0% oxygen can be added. 3. After taking the above measures, the furnace condition is stable, when the hot air pressure is lower than the specified wind pressure, air can be added 100-200m3/min4, the furnace temperature exceeds the specified level, and the wind temperature can be reduced by 65438+ when the furnace condition is unstable. Coke can be reduced according to the silicon content in pig iron. 6. If the iron content of raw materials or the ash content of coke decreases, the coke load should be adjusted quickly. 7. The zero error of raw material weighing equipment increases, and then adjust the coke load after returning to normal zero. 8. After the moisture content of coke is reduced (generally 3%-5%), the coke with added moisture should be reduced in time. Note: When the furnace temperature is high, it can be properly overcorrected to avoid thermal suspension. Before the furnace temperature drops to the normal level, a certain amount of heat will be added in time.