Application of ST98 Mass Flow Meter in Coal Coking

Abstract: The application information of ST98 mass flow meter in coal coking is provided by excellent flow meter and flow meter manufacturers. Abstract: This paper briefly describes the application, installation and debugging technology of ST98 mass flowmeter in gas flow measurement by taking the gas flow detection of the second gas purification workshop of Maanshan Iron and Steel Coal Coking Company as an example. 1. Overview Gas purification is the waste gas sent from the coke oven. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of ST98 mass flowmeter in coal coking. This paper briefly describes the application, installation and debugging technology of ST98 mass flowmeter in gas flow measurement by taking the gas flow detection of the second gas purification workshop of Maanshan Iron and Steel Coal Coking Company as an example. 1. Overview Gas purification is to turn the waste gas sent from the coke oven into relatively pure refined gas through a series of processes such as washing, deacidification, ammonia removal, and benzene removal, and then sent to the gas station or end user. The purified refined gas contains CO, O2, N2, H2 and other components. The content of each component is related to the control of the process, and each process system is different. The flow meter measurement unit usually adopts two kinds of volume flow and mass flow. Maanshan Iron and Steel Coal Coking Co., Ltd. selected ST98 mass flowmeter of FLUIDCOMPONENTSINTL (FCI) company in the United States for the measurement of the factory gas, using metric KG/HR as the measurement unit, and the collected data was transmitted to the central control room of the DCS system for centralized management. This article summarizes some installation skills of ST98 mass flowmeter on high-altitude large-diameter pipelines and some problems that need to be paid attention to in the debugging process for your reference. 2. Equipment structure and measurement principle ST98 mass flowmeter is a thermal diffusion mass flowmeter used for the measurement of various gases. It consists of a flow element, a flow transmitter and a package. For small-diameter process pipelines, in-line flow elements are generally used; for large-diameter process pipelines larger than 40mm, plug-in flow elements are generally used. There are various options for the process connection method of the flow element, the input power supply of the flow transmitter, the output signal calibration, and the packaging and installation methods for users to choose. According to the requirements of the on-site environment (zone I explosion-proof), Maanshan Iron and Steel chose the ST98 mass flowmeter with integrated in-situ packaging of flow transmitter and flow element, and plug-in threaded connection installation. The measurement principle is that a low power heater creates a temperature difference between the two RTDs by heating a resistance temperature detector (RTD). The flow of fluid removes heat from the heated RTD, causing the temperature difference between the two RTDs to change proportionally. The flow transmitter converts the temperature difference between RTDs into a scaled output signal to the DCS and an optional display value to the field digital display. Figure 1 is a schematic diagram of the ST98 flow element. 3. Installation 1) Confirm the installation position of the flow element. The factory gas pipeline is erected on the top layer of the pipe gallery, with an elevation of +7500mm, the outer diameter of the pipe is 1220mm, and the pipe material is Q235 carbon steel. ST98 requires at least 20 pipe diameters (process pipelines) upstream of the flow element to be left straight; downstream 10 times the pipe diameter. The flow element is inserted into the process line 0.5 inch (12.7 mm) past the centerline and in the same plane as the line cross section. FCI recommends that the flow element be installed vertically or horizontally in the process line. Considering that the process gas may contain moisture or even a small amount of tar and other liquids that accumulate on the RTD, and then drop into beads, which will take away part of the heat and affect the temperature difference between the two RTDs, thereby affecting the measurement accuracy. We install the flow element at the angle between the process line and the horizontal line 45°The diagonally upward position (as shown in Figure 2). When there is liquid stagnant on the RTD, it will quickly spread down along the RTD, so as not to aggregate into beads and drip down to take away heat. 2) Process connection head Installation The process connection head is made of 304 stainless steel, in the shape of a ring column (as shown in Figure 3). It must be ensured that the bottom surface S of the process connector is parallel to the axis of the process pipeline and the plane where L1 is located, so as to ensure that the flow element passes through the center of the cross section and is parallel to the cross section after the process connector is inserted into the process pipeline. First, according to the requirements of the installation location, mark a point O on the process pipeline, on both sides of the O point, use a line hammer to determine the tangent points A and A between the vertical direction and the process pipeline’(as in plan view 4), link AA’, over A and A’make AA’Perpendicular, from A and A’Mark down the 1/4 process line perimeter locations B and B along its vertical line’, pass O as OO’⊥BB’at point O’, then O’The point is the exact installation location of the flow element. will OO’Line extension, since O’point in OO’Two points C and C at the same distance are marked on the extension line’(As shown in Figure 4). in O’Spot open the hole and spot weld the process connector to O’point. With the help of a square, adjust the process connection so that the upper and bottom S are in the BB’Oriented parallel to the process line axis.

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