In this paper, the practice situation of quick blowing-down and reblowing of 1280m3 blast fur?nace in Jiangyin Xingcheng Special Steel Co., Ltd. is introduced, the operation points and precautions of quick blowing-down and reblowing of blast furnace are expounded, the difficult problems of quick blow?ing-down and reblowing are analyzed, and the recovery situation of furnace condition after reblowing of blast furnace is summarized. The practice has proved that by implementing a series of operation mea?sures, such as canceling the net coke when blast furnace blowing-down and increasing the coke ratio, ac?celerating the slag and iron discharge rate, and increasing the initial air volume during reblowing, the fur?nace condition recovery time of the blast furnace condition after the reblowing is obviously shortened , and the tackle key problems objectives of quick blowing-down and reblowing of 1280m3 blast furnace is achieved. After rapid recovery, the furnace condition of 1280m3 blast furnace is stable and anterograde, and the operation cost of the blast furnace is reduced.
The chain grate machine-rotary kiln is a new process for producing pellet ore, because it can produce high-quality pellet ore to meet the needs of blast furnaces, therefore which is widely used by pellet ore manufacturing enterprise.However, the production process of pellet ore with chain grate machinerotary kiln is complex, and the quality of finished pellet ore is closely related to each production technics and operation, which makes the quality control and adjustment of pellet ore lag behind, and appearing strong periodicity. At present, most pellet ore production enterprises take finished pellet ore samples manually on site for inspection, which makes the pellet ore testing results not real-time guidance for the production process and has a great deal of uncertainty. Therefore, it shows up particularly important to establish the quality prediction algorithm model for the finished pellet ore. The scholars at home and abroad have done a lot of work on the quality prediction algorithm for the pellet ore,there are mainly case-based inference algorithms, neural network-based algorithms, genetic algorithms and other algorithms. In this paper, the pellet ore quality prediction algorithm is analyzed, and the performance of the algorithm and the future development of this field are evaluated and reflected.
Conventional full-hard state cold rolled low carbon steel SPCC products are low in cost and high in hardness, but its mechanical properties cannot be guaranteed, its molding performance is poor,and the risk of processing cracking by users is large, so the use and promotion of products are limited.For this problem, the hardness performance check and bending forming experiment were carried out on the conventional full-hard state cold rolled low carbon steel SPCC products produced by the company,and according to the check and experiment results, the optimized design of the SPCC products production technics was carried out. Through optimizing the chemical composition, hot rolling coiling temperature and cold rolling reduction rate of SPCC products, the surface hardness of full-hard state cold rolled low carbon steel SPCC products can be effectively controlled below 95HRB, the molding performance of products can be improved, and the more complex forming process requirements can be met.
The two high speed wire rod rolling mills of Tiangang High Speed Wire Rod Plant are all imported from American Morgan Company, which mainly produce high-quality carbon structural steel, low alloy steel, alloy structural steel and other high-quality steels, these high-quality steels have highly requirements for surface quality. In order to remove the iron oxide on the surface of red steel billet, a set of high-efficiency high-pressure water descaling system has been installed. The system adopts one driven two control, which can meet the production needs of two high-speed wire rod rolling mills. This paper introduces the technical characteristics, technical scheme, the key points of operation and system protection of the high-efficiency high-pressure water descaling system. The system can realize automatic pressure regulation of descaling high-pressure pump by control of the frequency converter and the PLC,the descaling area ratio is more than 98%, avoids the surface pockmarks and scabs caused by iron oxide, improves the surface quality of the wire rod, and eliminates the quality objection.
A lot of high-temperature flue gas will be produced in the production process of sinter, and the use of this part of the heat for power generation has been included in the national key energy-saving technology promotion project, this is an effective way for iron and steel enterprises to save energy, reduce costs and increase benefits. A steel enterprise has built a 152m~2 step sintering machine, in order to fully recover and utilize the sintering waste heat and reduce the energy consumption of the sintering productive process, it decided to carry out the construction project of power generation by sintering waste heat.This paper introduces the general situation of the 152m~2 step sintering machine in the enterprise, as well as the equipment composition and process flow of the waste heat power generation system, emphatically analyzes the key technologies of deserve attention in the design, construction and operation of the waste heat power generation facilities, and makes a forward-looking discussion on the development of the waste heat power generation of the step sintering machine.
