Reducing cost and increasing efficiency is the key for enterprises to break through difficulties and achieve sustainable development. The reduction of each share cost and the improvement of each benefit may become an important chip for enterprises to gain a foothold in the market tide, which is not only related to the profits of enterprises, but also affects the long-term competitiveness and future trend of enterprises. The units of Hebei Xinda Iron and Steel Group Co., Ltd. implement specific safeguard measures from the aspects of optimization process, energy saving and consumption reduction, and hierarchical control, clarify work objectives and assessment standards, and achieve effective results by steadily promoting cost reduction and efficiency improvement in each production link through item-by-item supervision.
Hebei Xinda Steel Group Co., Ltd. rolling mill coil production line in order to reduce costs, effective, in the use of equipment to repair the old, in the control of energy "save". In order to implement the work of cost reduction and efficiency increase, the coil production line set up an improvement team and organized a meeting to improve the high-pressure water descaling control system. At the meeting, the team members conducted an in-depth analysis of the causes of frequent failures of the descaling system, and investigated the suspicious factors at the end one by one through on-site inspection, analysis of automatic control procedures, monitoring procedures and other methods. Until the main causes affecting the descaling system are found.
In view of the aging of the equipment, due to the aging of the high pressure pump group, the pressure during high-speed operation can only reach about 21.3MPa. In the adjustment program, the opening and closing value of the minimum flow valve of the phosphorus removal pump is changed from the original closing value lower than 19MPa and opening value higher than 21.5MPa to opening value higher than 21MPa, so as to enable it to open normally and increase the flow rate of the pump body. The purpose of cooling is achieved, and the problem of chain shutdown of pump housing temperature alarm is eliminated.
In view of the abnormal operation of the minimum flow valve, due to the large pressure fluctuation of one high pressure pump group, the minimum flow valve has frequent interlocking action. Therefore, the action setting value of the minimum flow valve of the high pressure pump group is adjusted to open above 22MPa instead of closing below 19MPa and opening above 21.5MPa, so as to increase its operating range. The severe vibration of the pipeline caused by frequent operation of the minimum flow valve is eliminated.
To solve the problem of abnormal closure of the injection valve, the injection valve is opened through the descaling box in the process of advancing the billet, and high pressure water is sprayed to the surface of the billet through the descaling water nozzle to remove the oxide sheet. The interruption of injection permit condition is the direct cause of short closure of injection valve. In order to avoid the abnormal flask-off of the injection permit signal caused by communication interruption and other problems, the injection permit signal was filtered in the rolling line control PLC, which was gradually extended from 300ms to 1.2s, and the abnormal closure of the injection valve resulted in a significant decrease in the descaling and unnet phenomenon, but it was not completely eliminated.
To this end, the improvement team conducted an in-depth investigation and found that the root cause of the unsatisfactory injection permit conditions was that in the process of descaling, due to the decline in the pressurization capacity of the dephosphorization pump, the pressure of the output pipeline dropped sharply, which was briefly lower than the 17MPa allowed for injection, and finally led to the injection valve being closed interlocking because the injection conditions were not met. Therefore, the improvement team tried to gradually increase the pressure of the accumulator without changing the operating state of the phosphorus removal pump, so as to improve the compensation ability of the accumulator in the descaling process. The pressure was increased from 22MPa to 23MPa, and the pressure during descaling was maintained at more than 17MPa, completely eliminating the abnormal shutdown of the descaling water caused by an instant sharp drop in system pressure.
After a series of improvement measures for the frequent failure of high pressure water descaling pump, the water leakage of the minimum flow valve pipe flange is eliminated, the descaling pump that should be offline for maintenance can continue to be used and run well, and the online service life is extended, and the descaling impurities caused by intermittent closure of the descaling box at the back of the furnace are completely eliminated. In the month of improvement, the number of failures of high-pressure water descaling was zero, which saved the cost of spare parts for the company and extended the service life of the phosphorus removal pump.
Cost reduction and efficiency, everyone is responsible, everything can be done. We should continue to take economic operation as the basis, promote cost reduction with process stability, continue to management to real benefits, to the cost to the potential of steady play, to the development of quality quality, and constantly improve the awareness and ability of cost reduction and efficiency, stock quality improvement, incremental excellence, so that cost reduction and efficiency become the internal driving force for enterprise development, and promote Xinda to move forward towards high-quality development goals.
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