Measurement Analysis and Improvement of Drum Differential Pressure Water Level Gauge

Abstract: The measurement analysis and improvement information of the steam drum differential pressure water level gauge are provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Overview The BW1025/18.44M boiler manufactured by Beijing Babcock-Wilcox Co., Ltd. is a pulverized coal boiler with subcritical parameters, one-time intermediate reheating, and single-drum natural circulation. Its rated evaporation is 936.5t/h, and the maximum continuous output is 1004t/h; saturation. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the measurement analysis and improvement article details of the steam drum differential pressure water level gauge. 1. Overview of B manufactured by Babcock-Wilcox, Beijing&The Wl025/18.44M boiler is a subcritical parameter, one-time intermediate reheat, single-drum natural circulation water-tube pulverized coal boiler. Its rated evaporation is 936.5t/h, and the maximum continuous output is 1004t/h; the rated pressure of saturated steam is 19.53MPa, and the maximum continuous output is 20.5MPa; the rated pressure of superheated steam is 18.34MPa, and the maximum continuous output is 18.44MPa. A total of 6 water level gauges are installed in the boiler, and 2 single-chamber balance container differential pressure water level gauges and one mica water level gauge are installed on the left and right sides of the steam drum behind the boiler; one differential pressure water level gauge on the left is used for For full water measurement, one is used for normal water level measurement; two differential pressure water level gauges on the right are used for normal water level measurement. The center distance of the two adjacent steam (water) side sampling holes on both sides of the furnace is 17.2m, while the center distance of the two steam (water) side sampling holes on each side is 380mm; The distance between the side connecting pipe and the water side connecting pipe is 335mm from the center line of the steam drum, and the normal water level line (zero water level line) of the steam drum coincides with the geometric center line of the steam drum. 2. Analysis of the original design of the balance container of Ba-Wei Company 1. Structural characteristics The structure of the original design of the balance container of Ba-Way company is shown in Figure 1. A and B are two equal-diameter tee joints (type 320-20). 1 and 2 are the steam side connecting pipes (D28×4, the length is 252, 510 respectively), 3 is the condenser tube (D133×16. Height 240), 4 is the water side connecting pipe (D28×4, the length is 482), 5 is the vertical connecting pipe (DZ8×4, the length is 482). It is not difficult to see that it is different in structure from the single-chamber balance container currently used in my country to measure the water level of the steam drum. There is a vertical connecting pipe between the steam-side connecting pipe and the water-side connecting pipe, which is connected with the two. The intersection point of the side connecting pipe (the steam-side tee joint A) is lower than the horizontal section of the steam-side connecting pipe (130mm from the centerline of the steam drum). Its technical characteristics are: when the water level is normal, the output differential pressure of the balance container is Ap0=4.23kPa, and the maximum output differential pressure of the balance container is △pmax=6.35kPa. 2. Analysis of problems and causes When the water level of the steam drum changes below the tee joint A on the steam side, the differential pressure output by the balance container has a linear relationship with the water level of the steam drum, which is consistent with the general principle of measuring the water level of the steam drum by a single-chamber balance container same. When the water level of the steam drum rises and submerges the steam-side tee joint A, the saturated steam in the steam-side communication pipe to the condenser is not continuous saturated steam, but the saturated water in the vertical communication pipe connects the steam-side communication pipe. The saturated steam in the boiler is divided into two sections, one section is connected with the steam drum, and the other section is connected with the condensing drum. Due to the formation of a water seal in the steam-side connecting pipe, the steam pressure on the side of the condensing cylinder decreases with the decrease of the temperature, and the pressure on the liquid surface in the condensing cylinder of the balance container is less than the pressure of the steam drum (rated value 19.53MPa), and a water seal is formed. The longer the time is, the smaller the pressure on the liquid surface of the condensing cylinder is relative to the original. At this time, the pressure value of the steam drum pressure acting on the positive and negative pressure sides of the single-chamber balance container is not equal, that is, the positive pressure side is smaller than the negative pressure side. Therefore, the differential pressure value output by the single-chamber balance vessel is not only the static differential pressure value on the positive and negative pressure sides, but also increases the difference between the steam drum pressure acting on the positive and negative pressure sides when a water seal is formed in the steam side communicating pipe. . Since the drum pressure value is relatively large, the difference (absolute value) is much larger than the static differential pressure value of the single-chamber balance vessel (qualitative analysis). If a differential pressure transmitter (calibrated according to the requirements, the range is 0~6.35kPa) is connected to the balance container, the positive side of the differential pressure transmitter is connected to the water side of the balance container, and the negative side is connected to the water side of the balance container. On the negative pressure side, the zero point of the differential pressure transmitter is negatively shifted throughout the whole process. When the differential pressure transmitter is normally put into operation, the boiler steam drum pressure rises to the rated value, and the steam drum water level rises to the steam side tee joint A, the difference is The differential pressure value of the pressure transmitter has exceeded the lower limit of its range (OkPa), and the output electrical signal will 'fly' in the direction of 'high water level' at a certain speed. 3. The working principle of the original design of the balance container is known from the above analysis. When the water level indication of the steam drum is abnormal, the actual water level line of the steam drum is just the original designed high water level protection action value (13Omm).

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