Application of Gas Flow Detection Technology

Abstract: The application information of gas flow detection technology is provided to you by excellent flowmeter and flowmeter manufacturers. Abstract: Starting from the analysis of the current situation of the flow detection of the gas branch pipe of the hot blast stove, it is analyzed in detail from the three aspects of the existing problems, the reasons for the failure and the solutions. Combined with the actual situation, the gas branch pipe flowmeter of the hot blast stove is remodeled to improve the gas flow rate. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of gas flow detection technology. Starting from the analysis of the current situation of the flow detection of the gas branch pipe of the hot blast stove, from the three aspects of the existing problems, the reasons for the failure and the solutions, and combining with the actual situation, the gas flow flow meter of the hot blast stove is improved by changing the type of the gas branch pipe flowmeter of the hot blast stove. detection accuracy. 1. Overview of the status quo The 5# and 6# top-fired hot blast stove systems in the iron smelting plant were completed and put into operation from July 2005 to November 2005, respectively, and were designed with Russian Kalukin technology, each with 3 hot blast stove bodies. The gas branch pipes of 5# and 6# hot blast stove system use V-shaped cone flowmeter and Verabar flowmeter respectively to measure the gas flow. Since 2009, due to the blockage of V-shaped cone flowmeter and Verabar flowmeter to varying degrees, the gas flow of the two hot blast stoves cannot be accurately detected, which has adversely affected the normal production of hot blast stoves and blast furnaces. 2. Analysis of existing problems and causes During the construction of the 5# and 6# hot blast stoves of the iron smelting company, the V-shaped cone flowmeter and the Weiliba flowmeter were used to measure the gas branch flow of the hot blast stove, as shown in Figure 1. The two blast furnaces have been put into operation for nearly six years. Due to the high moisture content and many impurities in the gas branch pipes, it is very easy to form viscous substances, and the flowmeter blockage failure often occurs, which makes the gas flow measurement inaccurate, and the hot blast stove workers cannot accurately measure the gas flow. Controlling the ratio of gas to air flow cannot effectively increase the supply air temperature. The V-cone flowmeter used in the 5# hot blast stove is connected to the gas pipeline through the upper and lower flanges, and cannot be disassembled and cleaned; the Weiliba flowmeter used in the 6# hot blast stove needs to be pulled out of the gas pipeline after the flowmeter is blocked. The flowmeter is used for cleaning. In this process, the gas leakage in the gas pipeline is serious, which can easily lead to gas poisoning accidents, which brings a very serious safety hazard to the on-site maintenance personnel. 3. Optimized support technology for gas flow detection In view of the above problems in gas flow detection, we have transformed this, taking the opportunity of blast furnace maintenance and overhaul to replace the gas detection flowmeters of the two blast furnace hot blast stove systems, and install and use them. Bitoba flowmeter. 3.1 The working principle of the Pitoba flowmeter. The Pitoba flowmeter is a differential pressure flowmeter that uses the pitot tube principle to extract the fluid flow rate (total pressure-static pressure=dynamic pressure) and then converts it into fluid volume flow and mass flow. The Pitoba flowmeter inserts the probe into the pipeline, the total pressure hole is aligned with the inflow direction of the fluid, and the static pressure hole is aligned with the outflow direction of the fluid. The differential pressure is calculated according to the differential pressure to calculate the fluid flow. The Bitoba flow sensor can realize the calibration of each probe in the high-precision standard wind tunnel from the wind speed of 0m/s to the blowing of 150m/s. The measuring point is in the center of the pipeline, and the calibrated data is obtained through complex calculations The correction coefficient of the probe is obtained, so that the central flow velocity extracted by the probe after the correction forms a corresponding relationship with the average value of the flow velocity at each point in the pipeline. The relationship between the average flow velocity at each point in the pipeline and the flow velocity at the probe extraction center is based on decades of blowing data from Tsinghua University. 3.2 The unique advantages of Bitoba flowmeter itself. Bitopa flow sensor fundamentally solves the problems of wind speed measurement fluctuation, anti-blocking, wear resistance, etc.; through online dredging, it solves the flow measurement of easily scaled media, and its measurement accuracy is high. Such as measuring flow, a wide range of media: high temperature and high pressure; high precision, high energy saving, high reliability; easy installation, easy maintenance and so on. 4. The technical transformation plan of gas flow measurement and detection After confirming the use of the new Pitoba flowmeter, we consulted the manufacturer and carried out the installation and debugging of the flowmeter. 4.1 Determine the installation position of the Bitopa probe flowmeter. The 5# hot blast stove used a V-shaped cone flowmeter before. Since the V-shaped cone flowmeter is about 2 meters long, it is directly connected to the coal branch pipe with a flange, which cannot be disassembled during normal maintenance, and the lower flange is 14 meters away from the hot blast stove platform. Only 0.3 meters, because the V-shaped cone flowmeter will affect the airflow in a certain distance below, and even generate eddy currents, so it is impossible to install the Pitoba probe flow on the 14-meter platform of the hot blast stove near the lower flange of the V-shaped cone count. Therefore, it is determined to install the straight pipe section of the gas pipeline on the 7-meter platform of the hot blast stove, and the installation platform of the Pitoba flowmeter is welded. The 6# hot blast stove used the Verabar flowmeter before. Since the Verabar flowmeter is also vertically inserted into the gas branch pipe from the outside of the pipeline,Therefore, after dismantling the Verabar flowmeter and closing the primary valve, the Pitoba flowmeter was installed at the straight section of the gas branch pipe on the 14-meter platform of the hot blast stove. 4.2 Install the Pitoba Probe Flowmeter. The anti-blocking type Bitoba is installed in a vertical insertion installation method from the outside on a vertical pipe. There are various installation methods such as threaded connection and flange connection. When installing with flange connection, it is only necessary to drill an insertion hole of about 50 ram in the measuring pipe, and then position the flange connection seat on the pipe. The blue can be tightened.

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