Improvement method of measuring instrument of circulating fluidized bed boiler

Abstract: The information on the improvement method of measuring instruments for circulating fluidized bed boilers is provided by the excellent manufacturers of flowmeters and flowmeters. Circulating fluidized bed boiler (CFB) has the characteristics of high efficiency, low pollution, wide adaptability of coal types, good load regulation, difficult to extinguish fire, and available ash and slag. It adopts clean combustion technology and conforms to the national environmental protection industry policy. Better coal adaptability. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the improvement method of circulating fluidized bed boiler measuring instruments. Circulating fluidized bed boiler (CFB) has the characteristics of high efficiency, low pollution, wide adaptability of coal types, good load regulation, difficult to extinguish fire, and available ash and slag. It adopts clean combustion technology and conforms to the national environmental protection industry policy. The better adaptability of coal types has been rapidly promoted in my country, and the supporting units are developing in the direction of 300MW and above. Due to the particularity of its structure, the thermal instrument measurement and protection instrument installed in the circulating fluidized bed boiler has many similarities and obvious differences compared with the conventional pulverized coal boiler. The measuring points and their functions of the steam-water system of the CFB boiler are the same as those of the ordinary pulverized coal furnace. The flue air system has added some measuring points for the pressure, temperature and flow of the fan air duct specially designed for the CFB boiler, and the measurement method is also the same as that of the ordinary pulverized coal The boiler is the same. The special feature of CFB boiler in parameter measurement lies in the detection of solid flow channel parameters such as furnace, separator, return valve and slag cooler. 1. Operating characteristics of circulating fluidized bed boilers CFB boilers should pay special attention to the monitoring, adjustment and control of bed temperature, separator inlet temperature, air-coal ratio and bed pressure during operation, and pay attention to the influence of material fluidization, circulation and The monitoring of various air volumes of combustion ensures the establishment of a stable and sufficient circulation of hot materials, so as to complete the fuel combustion and heat transfer process of boiler combustion. According to the characteristics of the circulating fluidized bed boiler, set the furnace temperature, bed temperature, bed material height and other relevant measuring points to ensure the safe and economical operation of the unit. Pressure measuring points shall be provided with interfaces and anti-blocking facilities, temperature measuring points shall be provided with thermocouple sockets, and temperature measuring points with anti-wear requirements shall be equipped with anti-wear devices. 2. The role and significance of the main thermal parameters 2.1 The bed temperature is an important operating parameter of the CFB boiler. The so-called bed temperature mainly refers to the material layer temperature of the fluidized material in the combustion dense phase zone. The bed temperature value is determined by comprehensive factors such as boiler structure, ash melting point, and emission indicators (different due to different coal types). Adjust the ratio of the primary air volume flowing through the air distribution plate and the secondary air volume directly entering the furnace to maintain the bed temperature. At the same time, pay attention to control the coal feeding volume to ensure that the temperature is at 850-925 °C, so that it is in the best combustion state and is conducive to In-furnace limestone desulfurization. If the bed temperature is too high or too low, the boiler will be coked and extinguished. The main factors that affect the bed temperature are coal type, coal feeding volume, primary/secondary air volume, return material volume and cold ash circulation. When the cycle magnification is constant, it is mainly related to the coal volume and air volume, and the primary air volume plays a major role. Take a Dongguo boiler with a capacity of 480t/h as an example. It has two bed temperature measuring points, 24 measuring points on the lower layer and 24 measuring points on the upper layer. The left and right sides are divided into four columns and three rows. They are all below the secondary tuyere and within the dense phase area. The measuring points of each layer are evenly and symmetrically arranged along the front, middle, and rear rows of the furnace. The output of each layer of measuring points is sent to the average calculation loop to calculate the average bed temperature. At the same time, each measuring point enters into the DCS display. When a point is 150 degrees different from the average temperature, it is judged as a dead point. 2.2 Bed press The pressure of the bed is a reflection of the height of the material layer. During operation, the bed pressure is usually controlled by adjusting the amount of slag discharge. A lot of bed material and high bed pressure are beneficial to stable combustion, reducing the impact of short-term coal cutting fluctuations, and reducing the content of combustibles in slag discharge; but at the same time, high bed pressure will increase the primary air pressure head, increase power consumption, and also greatly increase the power consumption. Increases the time to heat the bed material during the start-up ignition phase, reducing operating economy. Thin bed material and low bed pressure can easily cause uneven air distribution and cause coking. The bed pressure generally refers to the bed pressure in the dense phase area. The bed pressure measuring holes are generally arranged at 250mm from the end surface of the air distribution plate, with 3 on the left and 3 on the right. The 3 pressure measurement values ​​are judged by the logic of taking the middle of the 3. Afterwards, it is sent to the display and alarm loop; the average value of the three is taken as the feedback signal of the bed pressure adjustment system. The method of controlling the bed pressure is to maintain the constant furnace bed pressure by controlling the slag discharge system, that is, to ensure the ash balance and the composition of the bed material in the furnace. 2.3 The operation of the air volume circulating fluidized bed boiler is based on the fluidized high temperature material suspension combustion.

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