-), male, senior engineer, undergraduate, graduated from Anshan Iron and Steel College in 1989. In the blast furnace production process of steel enterprises, compressed air is mainly used for the iron mouth opening machine of the blast furnace, the drum slag of the INBA, the bag filter, and the construction and purging of the furnace. The application process has strict requirements on the pressure of the compressed air and is very important for the normal production of the entire system of the blast furnace. It can be seen that it is also very important that the air compressor station, as an auxiliary system other than the main body of the blast furnace, is capable of providing high-pressure air that meets the normal production requirements of the blast furnace. To this end, the author analyzes the many reasons why the compressed air pressure of Anshan Iron and Steel can not meet the on-site production, and points out that the corresponding measures can be taken to achieve stable improvement of compressed air. 1 The current situation and existing problems of the Anyang Steel Air Compressor Station 1.1 The current situation of the Anyang Steel Air Compressor Station takes the West Air Compressor Station as an example. The existing configuration of the air compressor station in Anshan West District is four compression-drying units, which supply two or three blast furnaces (3,200 m3) and adopt the working mode of “3 for 1 standbyâ€. The process is that after the air is degreased by the filter, the air is pressurized by the suction guide vane into the air compressor, and the compressed air after being pressurized is dehydrated by the gas-liquid separator into the dryer to be dried, and then supplied to the blast furnace for production through the dust remover. See specifically. The air compressor produces compressed air with a rated pressure of 0.88 MPa. When the blast furnace is not in use, the pressure at the air pressure station is 0.74 MPa. When the two blast furnaces are used for crossover, the pressure at the air pressure station is 0.57 MPa. When the two blast furnaces use gas at the same time, the pressure drop is 0.53 MPa, and the normal gas pressure of the blast furnace is 0.6 MPa. Since the gas supply pressure is lower than the new gas pressure of the blast furnace, it is easy to cause production accidents and affect the normal operation of the blast furnace production. 1.2 Problems 1.2.1 The fluctuation of compressed air pressure in the blast furnace is increased in the north, and the moisture content in the summer can reach 30%. This high-humidity air is compressed by the air compressor to meet the pressure requirement and then delivered to the gas-liquid separation. After the coarse dehydration, the amount of compressed air sent to the blast furnace after entering the dryer and then passing through the precipitator becomes less than 70% of the original high-humidity air. The amount of compressed air sent to the blast furnace per unit time of the air compressor station Naturally, it is reduced by nearly 30%, resulting in a decrease in the outlet pressure of the air compressor station and an increase in the power consumption of the air compressor station, and the subsequent dry dust removal system is overloaded. 1.2.2 Air compressor circulating cooling water temperature is always high. The circulating water of the air compressor enters the air compressor. The suitable water temperature is about 22 °C, and the current water temperature is high, even in the summer of 25 to 35 °C. Angang's current air compressor cooling water does not add new water with lower temperature due to cost reduction. Such a high circulating cooling water temperature will inevitably lead to an increase in the temperature of the lubricating oil in the oil cooler, the oil becoming thinner, the viscosity being lowered, and the oil film being thinned. In this way, the key parts of the air compressor are not well lubricated for a long time, causing serious wear on the contact surface or causing equipment failure and air leakage, thereby reducing the effective power of the air compressor and gradually decreasing the output pressure. 1.2.3 Compressed air system internal cause of short-term pressure dip from air compressor station to blast furnace compressed air user design, management and use of the internal system is not perfect, is another important reason for the lack of output pressure of air compressor station Especially the short-term pressure dips. The existing configuration of the air compressor station in the West District of Anshan Iron and Steel Co., Ltd. is equipped with four compression and drying units, which adopts the "3 with 1 standby" working mode. The air compressor selected for the supply of 2 and 3 blast furnaces is an air compressor with a rated pressure of 0.89 MPa. This design also takes into account factors such as the user's use capacity, the maximum humidity of the air humidity as the season fluctuates, and also has a certain amount of safety - even if the summer maximum humidity is 30%, dry air pressure (0.89X70%) It can still reach 0.62MPa, which is greater than the normal gas pressure of the blast furnace 0.6MPa. However, with the passage of time, many disadvantages in the system gradually appear: the failure rate of equipment, pipelines and valves in the system will gradually increase. The supply of spare parts, the supply and replacement of desiccant will not be timely. Since the compressed air user at the blast furnace site is not metered, the use of uncontrolled is used both in pressure and in quantity. Whether it is from the scientific aspect of space use or the consideration of construction cost, most of them are air compressor station configurations of “one air compressor station for two blast furnacesâ€. In this way, when a certain blast furnace fails to produce iron, it is very prone to a sudden drop in pressure caused by the "peak overlap" phenomenon of the compressed air of the two blast furnaces at the same time. The way of working "When faced with this" 1 preparation "still in maintenance, that" 3 "has a failure in the middle, there is no way to avoid the reduction of the output pressure of the air compressor station. 2 Measures to be solved After a long period of investigation and research, Anshan Iron and Steel proposed to adopt different transformation measures in different parts of the air compressor station to improve and maintain stable output compressed air pressure. Specifically, a dehumidifier is added between the filter and the suction vane to solve the problem of high humidity in the summer; the problem of excessive temperature of the circulating water is solved by supplementing the new water; and between the inlet liquid separator and the dust collector The accident passes through the tube to solve the problem of insufficient supply of pressure due to maintenance or failure. Through the implementation of the above three measures, the purpose of stably increasing the output pressure of the air compressor station and reducing the power consumption is achieved. 2.1 Increasing the dehumidifier The dehumidifier is arranged in parallel on the main pipe between the filter and the suction guide vane. By connecting the electric valve A, the check valve and the electric valve B and the electric valve C, the air is dehydrated and the air pressure is reduced. Air humidity of the machine (see the previous section of the "intake guide vane"). The specific operating principle is: the air enters the filter under the action of the suction guide vane to remove dust and remove oil. According to the air humidity signal of the air compressor, if the humidity is greater than the set value, the electric valve B and the electric valve C are opened, and the electric valve is closed. A, let the air pass through the dehumidifier to lower the air humidity below the set value, and then enter the air compressor through the suction guide vane. This can increase the useful work output of the air compressor and increase the compressed air content and pressure per unit volume. If the humidity is less than the set value, the electric valve B and the electric valve C are closed, and the electric valve A is opened at the same time, so that the air enters the air compressor through the check valve and the suction guide vane. Angang's compressed air moisture content is set at 10%. After this treatment in the summer, the useful work output of the air compressor is increased, the compressed air content per unit volume is increased by 20%, and the pressure is increased. Station output pressure integrated process. 2 In the air inlet manifold of the air compressor, the water supply device is viewed from the outside. The air compressor works on the air sucked into the vane to make it a constant pressure compressed air. The internal temperature of the air compressor rises, and the circulating water passes through the water inlet manifold. It enters the air compressor to cool and exchange heat, and the circulating water after heat exchange is discharged by the water main pipe. According to the circulating water temperature signal entering the air compressor, if the temperature is higher than the required value, the fresh water or cooling water is added to the water inlet pipe by the water supply device to lower the temperature below the required value to ensure the safe operation of the equipment (see Medium cooling water part). The specific procedure is: when the circulating water temperature is higher than the required value (the angang is set to 25 °c), the fresh water is added to the water inlet pipe by the water supply device to reduce the circulating water temperature to below 25 °C. The cooled circulating water is discharged by the water inlet main pipe and the air compressor, and then discharged by the water main pipe to ensure the safe operation of the equipment. This not only ensures the normal operation of the air compressor, but also prolongs the service life of the air compressor. Under normal circumstances, after the two technologies of dehumidification and cooling new water are treated, the compressed air of the air compressor is discharged by gravity from the lower part through the gas-liquid separator, and the compressed air after the water is removed into the dryer for drying. After entering the dust remover to remove impurities such as dust, it is ensured that a compressed air of 0.62 MPa is formed to be supplied to the blast furnace. 2.3 Before the inlet of the gas-liquid separator and the outlet of the precipitator, use a straight pipe to set up a straight pipe before the inlet of the gas-liquid separator and after the outlet of the precipitator to form a straight-through, and control by manually operating the valve D and the check valve to Used for maintenance or failure, keep the pressure stable. Under normal conditions, the compressed air of the air compressor is supplied to the blast furnace through the gas-liquid separator, dryer and dust collector. If the gas-liquid separator, dryer, or dust collector malfunctions or needs to be repaired, first the air must be dehydrated by the dehumidifier, then the manual operation valve E and the manual operation valve F are closed, and the manual operation valve D is opened to make the compressed air reverse. The check valve is directly supplied to the blast furnace. In this way, the gas-liquid separator, the dryer and the precipitator are disconnected, so that the compressed air goes straight, which does not affect the production of the blast furnace, and reduces the maintenance time, and reduces the resistance loss of the gas-liquid separator, the dryer and the dust collector. The compressed air pressure is increased by O.IMPa. The compressed air pressure of the air compressor station can reach 0.63 MPa, which can simultaneously satisfy the two blast furnace production gases. 3 Application effect The implementation of this technology enables the air compressor station to obtain and provide a stable compressed air with a pressure of 0.63 MPa, which meets the requirements of the normal gas pressure of the blast furnace of 0.6 MPa, thus eliminating the previous "two blast furnace crossovers." When the gas is used, the pressure of the compressed air outlet station is 0.57 MPa; if the two blast furnaces use the gas at the same time, the pressure of the compressed air is reduced to 0.53 MPa. The implementation of this technology can guarantee the normal operation of the blast furnace on the level of ''furnace operation'). If the compressed air pressure is insufficient, the baghouse backflushing operation may not be possible. The emergence of this phenomenon will lead to blast furnace wind reduction, strength reduction and even wind. Not only the loss of production, but also the blast furnace's endless wind reduction, down-strength and even the wind directly caused the normal operation of the blast furnace to be suddenly disrupted. The gas, liquid and solid operation inside the blast furnace to select the appropriate full furnace coke ratio, reasonable arrangement Charge location. The higher total furnace coke ratio is beneficial to increase the heat of the hearth and the physical heat of the molten iron, control the Al23 in the slag, calculate the content, and improve the slag iron flow and slag iron separation. Adjust the principle of “less movement, early movement, and take the initiativeâ€, use the “platform plus funnel†cloth mode to stabilize the width of the coke platform. With the addition of wind and wind temperature, gradually expand the batch and add coke load, and then fine-tune the file. Position the angle, increase the material line, adjust the number of fabric turns, and control the gas flow distribution. Control the full pressure difference within a certain range, match the upper and lower adjustment operating parameters, to ensure that "the central airflow is the main, taking into account the edge airflow" to stabilize the furnace heat load 3, improve and stabilize the gas utilization rate of about 52.5%. 4.4 With careful preparation and steady progress, project management is carefully prepared and planned in the early stage. The project management of the extra-large blast furnace is carried out. The equipment maintenance is closely planned during the opening stage, and the key equipments are identified one by one. The professional equipment inspection is carried out, and the equipment hidden dangers are eliminated in the bud. Formulate project emergency plans, and pay attention to the gradual progress in accordance with the network plan in the implementation process. There are steps, plans, and standards to promote the process of opening the furnace. In order to improve and stabilize the physical heat of molten iron as the standard, increase the oxygen to carbon ratio, rapidly reduce the molten silicon, increase the temperature and humidification of the wind, spray coal, and oxygen-rich smelting to strengthen the smelting, and achieve rapid production of the blast furnace. Improve standardization operations. Use the better quality pre-furnace refractory materials, and specially set the standard for the slag tapping operation before the furnace. 5 Needs improvement At the initial stage of air supply, the humidification pressure is low, and the pressure regulating valve group fails, causing abnormal fluctuation of the top pressure, which affects the blast furnace to warm the air and increase the air. After the furnace was opened, there were different degrees of blisters in the four iron mouth parts, indicating that the water in the furnace was not completely dried out during the oven. During the process of tapping the iron, the impact of the oiled sleepers on the environment was not considered. The dust bag in front of the furnace was blocked by oil. 6 Conclusion Angang No. 3 blast furnace was opened, and it achieved success and achieved rapid production. It shows that under the guidance of Baosteel experts, Angang has made great progress in the ironmaking production practice technology of driving large-scale blast furnace, and quickly optimized production indicators. Obtained considerable economic benefits. The opening of the No. 3 blast furnace has been completed, which has accumulated and verified the technical experience of China in the production of large-scale blast furnaces, and provided reference for the production of large-scale blast furnaces that will be put into production in the future. Select from a variety of printing and binding options to suit your budget. Catalog binding choices range from staple to perfect bound. Paper stocks include economy, premium white (glossy or recycled), and color. Printing catalogs couldn`t be easier and more stunning. Catalog Printing,Catalog Book Printing,Custom Catalog Printing,Short Run Catalog Printing Shenyang Meitu Artical Printing Co.,Ltd , https://www.meituprinting.com
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