The Blast Furnace Cooling Water Temperature Difference Detection Device Design Based On CAN Bus

The water temperature difference of the blast furnace cooling system，one of mainparameter of the blast furnace heating load, is an important foundation for the safeproduction of blast furnace iron-making. The system could learn the heat load the blastfurnace cooling wall withstands, judge the production status in the blast furnace cooling wallin real time and monitor whether water leakage and breakage occurs to the scaling, and thenachieve the purpose of extending life of the blast furnace.The issue, taking the detection of furnace cooling water temperature as the researchsubject, had the procedures as following: Firstly, by access to relevant materials, the researchstatus and methods of heat load of the blast furnace at home and abroad were understood.Secondly, the measurement principle of blast furnace cooling water temperature and thecooling process were analyzed. At last, a digital design about the blast furnace cooling watertemperature detection had within it the advantages of both the high precision sensorDS18B20and CAN bus technology was put forward. It would achieve the detection in viewof the characteristics of blast furnace cooling water temperature, such as abundant detectingpoints, high precision, etc.Starting with the requirements of iron making process and blast furnace cooling watertesting, and taking the characteristics of high requirements for cooling water temperaturedetection, the paper use of high-precision digital sensor DS18B20to collect pointstemperature, and the least square method for data processing in order to safeguard theaccuracy of detection. It expand the single temperature measurement device into thedetection system by using of the characteristics of CAN bus like flexible network and betterinstantaneity, which can achieves multi-point measurements of the blast furnace coolingwater temperature. For a single device, thinking and designing from both hardware andsoftware respectively. In Hardware, taking STM32F103RBT6processor as core to constitutethe blast furnace temperature measurement hardware platform together with a digitaltemperature sensor DS18B20, CAN transceiver and the external circuit. In software, mainlyrealizing the settings of temperature node address and DS18B20read and write, as well asthe process of data accuracy and the function of CAN communication. The design used thehigh precision thermometer and the oven to calibrate DS18B20’s temperature between30~60℃, in order to ensure the temperature acquisition. It was confirmed by experiment that the cooling water system of blast furnace can meetthe requirement of blast furnace cooling water detection, which is by using DS18B20andCAN bus technology and the system with several advantages such as simple hardware,convenient network, high precision of temperature measurement and accurate datatransmission, can be used in various kinds of high precision temperature measurementoccasions, such as in daily life, industrial and agricultural production.