effect
The docking of the DN1400mm blast furnace gas pipeline for the pickling and galvanizing plant succeeded once, ending the history of traditional pipeline stoppage with gas pumping and blind plate replacement, reducing the time for the operator to directly contact the gas and improving the safety of the operator The method is safe, reliable and efficient. Only this example can reduce the losses of Handan Steel as follows:
(1) The daily iron production of No. 7 blast furnace is 4300t, the daily production of No. 5 blast furnace is 2500t, and the daily production of No. 4 blast furnace is 2000t; within 30h, 11,000t less iron can be avoided for No. 4, 5 and 7 blast furnaces, which is calculated based on 900 yuan per ton of iron to avoid loss 9.9 million yuan.
(2) Reduce the continuous rolling stoppage for 30 hours, and produce an additional 4,167t of thin sheet. Calculated on the basis of 2,000 yuan per ton of thin sheet, a loss of 83.314 million yuan can be avoided.
(3) Reduce the shutdown of two 35t boilers for 30h, and calculate the loss of 18.19 million yuan based on 90 yuan per ton of steam.
(4) Avoid stopping the new milling station, 2 # TRT, gas turbine and 5 #, 6 # coke oven for 30 hours to avoid loss of more than 400,000 yuan.
(5) Except for the cost of blind plugging, the amount of nitrogen used for nitrogen replacement, the use of cranes, and labor costs, it is not counted, and the loss of 188.213 million yuan can be avoided only by reducing the amount of production shutdown.
Conclusion
Although the combined pressure opening technology has achieved good results in the opening of the gas pipeline, but also found some areas that need to be improved during the opening process, such as a small amount of gas leaking and sealing during the operation of the sealing surface of the turntable of the opening machine The effect needs to be improved; because the hole surface is arc when the hole is opened, the side drill bit needs to be properly selected. It is best to use multiple drills or barrel milling cutters; due to the long stroke of the drilling machine, the positioning effect of the hydraulic positioner is poor. Need to improve, it is recommended to use a multi-fulcrum hydraulic system; the opening of the drill bit window is not good, it is recommended to install the indicator light on the bit locator.
From the overall effect point of view, the combined pressure hole-opening machine has reasonable structure, small occupation space, simple operation and easy to learn, convenient transportation and lifting, and consumes less manpower and material resources; this technology should be popularized from the aspects of environmental protection, safety, and benefits.
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