02Mud jacket management
The taphole mud jacket refers to the surface of the taphole frame. The No. 5 blast furnace mud jacket frame and taphole channel are made of refractory materials, and the outside is made of baking-free rapid ramming material through lamination. The mud sleeve is the direct contact surface between the iron mouth and the mud cannon. The functions of the mud jacket: 1) Keep the nozzle in close contact with the mud jacket, play a sealing role during the plugging process, and prevent excessive gaps from occurring during the mud plugging process, resulting in mud plugging and loose plugging. 2) The taphole mud sleeve must have a certain thickness. Firstly, it prevents the gun head from directly hitting the taphole refractory material when blocking the taphole. Secondly, it prevents the mud sleeve from deepening after repeated use, causing the plugging to be lax. 3) The mud jacket can prevent the taphole refractory materials from being exposed to high-temperature oxidizing atmosphere for a long time, causing physical and chemical changes due to rapid cooling, rapid heat, and oxidation, which will affect the overall structural strength of the taphole. At the same time, it also prevents water leakage in the taphole area. Refractory materials are in direct contact with water vapor, causing rapid oxidation of the refractory materials and deterioration in quality. In view of the fact that it is in the later stage of furnace service, the erosion of the furnace bottom has intensified, and the depth of the dead iron layer has increased, which puts forward higher requirements for the quality of the mud jacket. In actual production, due to the unqualified quality of the mud jacket, mud is often blocked and the taphole is affected. Depth, in the light case, the discharge of slag iron is not smooth, resulting in frequent addition and subtraction of wind, in serious cases, the increase in the number of tapping times aggravates the erosion of the hearth, affecting safety and longevity. The daily mud jacket of No. 5 blast furnace uses ramming material, which is easy to use and operate. , it usually takes 30-40 minutes from the removal of the old mud jacket to the baking and putting into use of the new mud jacket. In this way, when the mud jacket is damaged or the depth is too deep, it can be directly produced on site. At the same time, in order to facilitate the production of mud jackets, a mud jacket rapid prototyping disk is made according to the depth and size of the mud jacket frame. The disk is composed of 3-5 small drill bits and circular steel plates. During the production process, the mud jacket frame can be quickly formed, which is Removing the old mud jacket saves time and prevents the mud jacket from being damaged due to too long mud jacket operations, requiring the taphole mud jacket to be remade every 2-3 days. When there is continuous mud coming out of the taphole or the taphole is too shallow, the mud jacket must be remade to prevent counterfeiting and deception of the mud jacket. It has been found that the assessment will be carried out according to the economic responsibility system.
03 Iron times management
Benxi Iron and Steel’s No. 5 blast furnace is designed with three tapholes and adopts a continuous tapping operation mode of 2 in use and 1 in standby. The average daily tapping is about 13-15 times in the initial stage of furnace operation. According to the actual production needs and the requirement to reduce production costs, the number of tapping times is reduced. As the furnace service time increases, the number of tapping times is also required to reduce the hearth erosion rate. No. 5 blast furnace has made improvements from the following points: First, pay attention to For equipment management in front of the furnace, check and confirm the main equipment in front of the furnace: opening machine, mud gun, swing nozzle and slag flute 10-15 minutes in advance before opening the taphole, so as to avoid increasing the number of tappings due to small delays. Secondly, the mud cannon and opening machine in front of the furnace were transformed into domestic products. The amount of mud loaded in the mud cannon was increased, and the amount of mud was increased, so that the depth of the tap hole was gradually increased. The tapping pressure of the opening machine and the rotation speed of the drill pipe were increased to improve the opening speed. The port efficiency is achieved to reduce the number of tapping times. Again, due to the aging equipment of No. 5 Furnace and the increased frequency of failures, each team in front of the furnace is required to pre-drill the taphole by 100-200mm. First, in order to find the center line of the taphole and reduce unnecessary work before opening the taphole. Secondly, The purpose is to better dry the damp mud in the tap hole tunnel and improve the coking quality of the gun mud. Under the conditions of ensuring that the working condition of the taphole is stable, the slag iron is discharged cleanly, and the furnace conditions are running smoothly, the number of tapping times is reduced, and at the same time, the labor intensity in front of the furnace and the consumption of materials for opening the taphole are greatly reduced, and it is also beneficial to the maintenance of the taphole and the blast furnace longevity.