Realization of 3D Temperature Field Visualization Technology in Furnace in DCS

Abstract: The technical information of realizing the visualization of the three-dimensional temperature field in the furnace in DCS is provided by the excellent flowmeter and flowmeter manufacturers. The furnace safety monitoring system (FSSS), which is an important subsystem of the DCS of thermal power plants, can only judge the presence or absence of a single nozzle flame of the burner, and there is very little furnace combustion information obtained online. The flame temperature distribution in the furnace is the chemical reaction and flow of pulverized coal at high temperature. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the technical article on realizing the visualization of the three-dimensional temperature field in the furnace in DCS. The furnace safety monitoring system (FSSS), which is an important subsystem of the DCS of thermal power plants, can only judge the presence or absence of a single nozzle flame of the burner, and there is very little furnace combustion information obtained online. The flame temperature distribution in the furnace is a comprehensive manifestation of the complex physical and chemical processes of high temperature chemical reaction, flow, heat and mass transfer of coal powder, and its three-dimensional temperature distribution characteristics are the key to revealing the combustion law in the furnace. 1. Basic principle The CCD flame probe is used as a two-dimensional radiation energy sensor to receive the high-temperature radiation energy signal in the three-dimensional furnace chamber. The correlation model between the radiation energy image and the combustion temperature distribution in the furnace is used to calculate the three-dimensional temperature distribution in the furnace by using the Tikhonov regularization algorithm. , its calculation refresh rate does not exceed 5s, and its validity and accuracy have been verified. For a once-through boiler with subcritical pressure, one intermediate reheat, double furnace, type II layout, and tangential combustion at four corners, the calculation area of ​​the combustion temperature distribution in the furnace is set to be above the cold ash hopper and below the folded smoke angle. The elevation is ( 12~27.6)m, the whole furnace cross section is 17m×8.475m (about 144m2), the cross-sectional area of ​​a single furnace is 8.5m×8.475m (about 72m2). A single furnace divides the temperature field calculation interval into lO along the directions of i (furnace width), H (furnace depth) and k (furnace height).×lO×A grid of 16, that is, a single furnace is divided into 16 sections along the height direction, and each section is divided into 100 (10×10) grids, so that the size of each three-dimensional grid cell is 1×0.85×0.847 (about 0.72) m3, which is the smallest resolution unit of the three-dimensional temperature distribution in the furnace. After the three-dimensional temperature field in the furnace is calculated by using the industrial control computer (industrial computer), it is sent to the DCS through communication for visual display in the DCS. 2. Realization method The characteristic quantities of the three-dimensional temperature distribution in the furnace are: (1) the temperature value Tj of the center of the flame in the whole furnace and its position coordinates (Xj, Yj, Zj); (2) the average combustion intensity of a certain section in the reaction furnace The temperature Ti; (3) reflects the degree of deflection of the flame center of the section of the layer, that is, the position of the highest temperature point of the section of the layer (Xi, Yi). The temperature field of a section of a layer of the double furnace is displayed in the DCS as shown in Figure 1. The temperature field of the section of the right furnace is in the actual coordinate plane xO1y, and the coordinates of the position of the highest temperature point are (X1, y1). For stereoscopic display, the angle between the x-axis and the y-axis of the actual coordinate plane on the DCS configuration screen is set toθBecause there is no three-dimensional coordinate system in DCS at present, only a plane rectangular coordinate system, so when the highest temperature point is displayed in DCS, the drawing coordinate plane x'O1y' is used as a reference, and the actual coordinates (X1, y1) need to be converted into drawing coordinates (X1 , y1). From Figure 1, the conversion relationship between the actual coordinates (X1, y1) and the drawing coordinates (X1', y1') is: x1'=X1+Y1cosθ, Y1'=Y1sinθ. In the same way, the difference between the actual coordinates (X2, y2) of the highest temperature point in the temperature field of furnace section B on the left side under the actual coordinate plane xO2y and the drawing coordinates (X2', y2') under the drawing coordinate plane x'O2y' The conversion relationship is: x'2=X2+Y2cosθ,Y2'=Y2sinθ. Therefore, the industrial computer only needs to send the actual coordinate value to the DCS, and in the DCS, it can be converted into drawing coordinates and displayed on the configuration screen visually. In addition, in order to clearly show the combustion intensity of the furnace chambers A and B of this layer, the column lengths on the left and right sides represent the average temperatures T1 and T2 of the furnace chambers of the layers A and B, respectively. If more section temperature fields need to be displayed, thenθangle is set smaller, otherwiseθThe corners are set larger. The temperature field of the 16-layer section is calculated by the industrial computer, and the temperature field of the section of the 1st, 4th, 8th, 12th, and 16th layers from bottom to top is displayed in the DCS application, because the 5-layer temperature field is distributed in the burner area and the furnace. The middle part and the lower part of the folded smoke flame angle are representative. In this example setθ=45. The industrial computer builds the furnace section temperature field information of each 5 layers and a total of 10 layers to the furnaces on both sides of the DCS, including the average temperature of each layer section and the location of the highest temperature point of each layer section (Xi, yi, Ti, i=l~10 ), as well as the size and intensity of the flame center of furnace A and B (Xi, Yi, Zj, Tj, j=1~2), a total of 38 data volumes, if all these data are transmitted by hard wiring, it will greatly increase the hardware Therefore, the serial communication method based on the Modbus communication protocol [4] is used for data transmission. The communication sets DCS as the master station and the industrial computer as the slave station. The DCS regularly sends commands to the industrial computer, requiring the industrial computer to transmit the temperature field information data packet to the DCS, and the data transmission timing period is 4s. Set the communication parameters of the Modbus communication module in the DCS serial communication controller. The parameters include slave station address, communication rate, communication port, parity bit, stop bit, etc. These parameters must be consistent with the settings of the serial communication module in the industrial computer. If the value is consistent, the communication between the two parties can be guaranteed to be correct [5]. The serial communication controller downloads, installs and records the Modbus communication configuration file in the detailed format of each temperature parameter point, and sends commands to the industrial computer through the RS-485 bus to realize the interactive communication between the DCS and the industrial computer.

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