At present, the temperature difference method is mainly adopted at home and abroad, that is, the state monitoring system for the blast furnace coal injection branch pipe is developed according to the working condition that the pulverized coal temperature is higher than the ambient temperature. This method has certain applicability to the pulverized coal injection branch pipe in a closed environment. However, for the coal-fired branch pipes in the outdoor environment, the temperature difference method is no longer applicable due to the different influences of the season, wind direction and ambient temperature on the coal injection branch pipes at different positions. At the same time, the temperature difference method has the disadvantage of slow response speed. This paper introduces a new type of blast furnace pulverized coal injection branch pipe condition monitoring system, which is to detect the concentration and speed of coal powder in each branch pipe by online, and block, air spray, stop spraying and poor transportation of each branch pipe during injection. Online monitoring is performed in an abnormal state, and an indication of the mass flow distribution of the pulverized coal injected into each branch pipe can be provided online. The transportation of pulverized coal in the blast furnace coal injection pipeline belongs to the category of gas-solid two-phase flow. For the detection field uniformity and measurement sensitivity of the capacitive sensor, for the measurement of the pulverized coal concentration of each branch of the tuyere, a spiral-shaped surface plate capacitive phase concentration sensor with a symmetrical edge protection electrode is used, and the four plates are simultaneously Torsion 180° in the direction of the pipe produces a rotating detection field to improve the “soft field effect†of the capacitive sensor and reduce the influence of the sensor on the flow pattern. The speed sensor uses a pair of surface plate capacitive sensors to calculate the transit time of the distance between the two sensors by calculating the cross-correlation function of the flow noise signals of the upstream and downstream speed sensors, and then calculate the flow velocity of the pulverized coal. The method is applicable to a single pipeline plus distributor system and is suitable for a multi-line coal injection system. The system was completed by Northeastern University and Baosteel. At the end of 2000, six branch pipes were installed and commissioned. In August 2001, all 36 branches were put into operation. The system uses single-chip microcomputer for data acquisition, and transmits it through 485 bus. The industrial computer performs data analysis and status judgment, and has recording and multi-alarm functions. At present, the system has been operating normally in Baosteel. The system monitors the state and the speed of the coal powder by injecting the pulverized coal in each branch, and has the characteristics of fast response. At the same time, the inspection devices of the coal injection tuyere branch pipes have good consistency, which can accurately indicate the mass flow rate of coal injection in each tuyere branch pipe, and ensure that the coal injection system is uniformly sprayed. Our FRP Pressure Tanks are designed to store and distribute water under pressure, making them ideal for residential, commercial, and industrial water treatment applications. They are made from high-quality FRP (Fiberglass Reinforced Plastic) material, which is known for its durability and corrosion resistance. Frp Membrane Housing,Frp Ro Membrane Housing,Ro Membrane Housing,Ro System Membrane Housing Hebei Chengda Water Technology Co.,Ltd. , https://www.arclion1976.com
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Blast furnace spraying coal branch status for each outlet to achieve stable blast furnace coal injection and a large number of long PCI balanced to ensure blast furnace along the line of great significance.