The transformation of the role of the exhaust fan in the steel plant

The transformation content is also in the process of transforming the main exhaust fan, and also transforming the large flue. To determine the amount of sintering exhaust gas, it is necessary to take into account the emission of various gases generated during the combustion and sintering of the sintered ignition fuel and solid fuel, and the amount of air leakage. The negative pressure of the main exhaust fan must meet the resistance of the sintered layer and the exhaust system. need.

According to the actual situation of the sintering workshop of our factory, the air leakage rate of the sintering system is generally 68%, and the expansion of the multi-tube dust collector of the machine head is not considered in this transformation. After the transformation, the resistance of the material layer and the multi-tube dust collector of the machine head will be increased accordingly. The resistance of the large flue before and after expansion is basically similar. On the basis of comprehensive consideration of the sintering process requirements and economic benefits, the air volume of the nameplate of the sintering exhaust fan is set to 2800m/min and the negative pressure is 3kPa.

There are two ways to renovate the main exhaust fan to improve the air volume and negative pressure: one is to increase the speed of the fan, and the other is to transform the rotor group. The D250-1 sintered main exhaust fan is equipped with JS Q10-10 motor. The design speed is 1480r/min. It is difficult and uneconomical to increase the fan speed.

If the rotor group is modified, the diameter of the fan impeller can be increased, and the performance parameters such as the air volume coefficient, the negative pressure coefficient, the impeller outlet width and the specific speed of the fan can be comprehensively optimized, and the same can be achieved. In September 1998, our factory transformed the sintered No. 2 2500-1 main exhaust fan into D280-14.

According to the parameters of the air blower and negative pressure of the main exhaust fan proposed by the process, the fan foundation and the motor are not changed. The main rotor and the outer casing of the D250-1 exhaust fan are used to transform the old rotor group into the following four parts: l) The outlet width is 170. Increase to 184; 2) increase the diameter of the impeller from 085mm to 135mrn; 3) change the blade curvature; 4) increase the blade from 18 to 24. Refer to 1 and 1, 2 for the relevant parameters and characteristic curves before and after the fan transformation.

After the transformation, the fan efficiency is constant, and the operating air volume and negative pressure in the actual operation reach a wide range of optimal efficiency (the air volume measurement data in the middle working condition is too large. Because the error factors are the same, the calculation can be used to calculate the working air volume. The relative increment is basically consistent with the relative increase in the nameplate volume.

After the expansion and sintering of the supporting sintering, the flow rate of the flue gas in the original large flue will increase from 12.03m/s to 13.47m/S. The flow rate will increase, which is not conducive to the settlement of coarse particles, which will intensify the large flue wall and main The blades of the exhaust fan are worn to increase the pipe resistance of the exhaust system.

Considering that the original large flue has not been updated since the sintering machine was put into production, the wear has been severe. Therefore, in the case of difficulty in expanding and expanding the multi-tube dust collector of the sintered No. 2 head, the large flue is updated and its diameter is changed from The transformation of the main exhaust fan of Hangzhou Iron and Steel Co., Ltd. seems to expand to 50mm, so that the flow rate of the flue gas in the pipeline is reduced to 10.32m/S, and the dust removal efficiency of the large flue is about 50%. Designed to recover the amount of available iron dust.

After the transformation of the No. 2 main exhaust fan before and after the transformation of the parameters before the transformation (1995-011 1998-08), the nameplate import flow and households. The design curve of the characteristic curve of the centrifugal blower before the transformation is carried out synchronously with the overhaul of the No. 2 sintering machine. The production conditions before and after the large modification have changed significantly, for example, the air leakage rate has dropped significantly. The improvement of production indicators in 2 includes the comprehensive effects of overhauling various technical measures.

However, after the modification of the No. 2 main exhaust fan, the air volume was increased, which contributed to the large increase in the output, utilization coefficient and vertical sintering speed of the sintered ore.

Conclusion According to the situation of sintering in our factory, increasing the capacity of the wind turbine is a reforming measure to increase the efficiency of investment in sinter production. This successful experience has been applied in the transformation of similar sintered main exhaust fans. The problem after the transformation is that the cyclone treatment volume of each of the 192-tube multi-tube dust collectors is as high as 875, far exceeding the design value (650-750 hrs). In the transformation of the sintering main engine, it is necessary to completely reform the head dust removal system to further reduce the dust emission concentration of the machine head and reduce the wear of the fan impeller.

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