Application of Solid Flow Meter in Pulverized Coal Detection

Solid flowmeters are widely used in many flow measurements. This article mainly introduces the application of fly ash solid flowmeters in flow measurement. Large-scale coal-fired units in thermal power plants generally adopt a direct blowing pulverization system. There are 4 to 8 primary air pulverized coal pipes directly connected to the boiler burner at the outlet of each pulverizer, and the pulverized coal is transported to the boiler through the pulverized pipeline. The burner burns. Due to the different lengths and number of elbows of each pulverized coal pipeline, the pressure loss of each pipeline is different, resulting in uneven distribution of pulverized coal among the pulverized coal pipelines, and as a result, the burner cannot operate under the condition of the best air-to-coal ratio. Normal operation reduces combustion efficiency, increases emissions and increases boiler failure rate. When the pulverized coal concentration is too high: the pulverized coal is blocked, and the pulverized coal cannot be transported into the furnace, and at the same time, the pulverized coal in the pipeline is caused to spontaneously ignite and the pulverized coal is burned out; High-temperature corrosion of the heating surface and the heating surface of the superheater; local slagging of the furnace and the superheater seriously affect the normal operation of the boiler. When the concentration of pulverized coal is too low: the temperature of the furnace is lowered, it is easy to turn off, the pressure of the boiler is lowered, and the load requirement cannot be met; a large amount of NOX is generated, the environment is polluted, the superheater is high-temperature, and even causes accidents such as superheater tube explosion; in order to increase the pressure, increase the pressure once The flow rate of wind (powder delivery pipe) and the tangential circle of the furnace deviate from the center of the furnace, resulting in local slagging of the furnace wall, excessive deviation of the flue gas temperature on the heating surface at the rear, and even tube explosion. When the flow rate of pulverized coal and air mixture is too fast, it will affect the optimal concentration of pulverized coal and increase the wear of the powder delivery pipe; the flow rate of the mixture at the outlet of the burner is too fast, and the combustion lags behind, causing the center of the flame to deviate and easily causing local coking of the furnace wall And the overheating of the superheater at the end of the furnace bursts the tube; the combustion is not complete, the carbon content in the ash and the temperature of the exhaust gas increase, and the boiler efficiency is reduced; The increase of pulverized coal will cause pipe blockage; cause spontaneous combustion of pulverized coal, and even cause pulverized coal pipeline explosion; the flow rate of the mixture at the outlet of the burner is too slow, a large amount of pulverized coal will be separated from the main air flow, and long-term removal will cause increased coal consumption, and will also cause furnace flameout and The secondary combustion blocks the ash outlet at the lower part of the boiler.

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