Method and device for measuring concentration of coal powder

Abstract

The invention discloses a method for measuring the concentration of coal powder. The method comprises the following steps of: 1) selecting an air flow parameter measurement point I and an air flow parameter measurement point II before and after powder conveying air flow and the coal powder are mixed on a primary air pipeline, setting the unmixed air flow parameter measurement point I at a position where the air flow is steady, and the coal powder and the air are going to be mixed, setting the mixed air flow parameter measurement point II at a position where the speed of coal powder particles reaches the speed of the air flow behind the mixed point, selecting a pipe section L as a flow pressure drop measurement pipe section from a horizontal straight pipeline after the speed of the coal powder particles reaches the speed of the air flow, and arranging static pressure measurement points for measuring the pressure drop of the straight pipe section at two ends of the pipe section L respectively; 2) measuring the static pressure P1 and the full pressure P before mixing; 3) measuring the static pressure P2 after mixing and the pressure drop deltaPLD of the pipe section L; and 4) calculating the concentration of the coal powder. The invention also discloses a measurement device for implementing the method. The method and the device for measuring the concentration of the coal powder are suitable for primary air pipelines of a middle warehouse-type powdering system boiler.

Description

technical field [0001] The invention relates to the technical field of boiler pulverized coal concentration measurement, in particular to a method and device for measuring pulverized coal concentration. Background technique [0002] The distribution of pulverized coal among the burners of pulverized coal boilers directly affects the safety and economy of boiler equipment operation, and also has an important impact on the nitrogen oxide emission level of coal-fired boilers. Measuring the pulverized coal concentration in the primary air duct is an important means to monitor the operation of the burner. For pulverized coal boilers with intermediate storage bin pulverizing systems, in the past, people used to measure the air flow rate and temperature before and after mixing pulverized coal, and calculate the pulverized coal concentration in the primary air pulverized mixture according to the heat balance; When using this method, the specific heat of coal powder is difficult to ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate measurement of the pulverized coal concentration in the prior art; provide a method and device for measuring the pulverized coal concentration; simple and accurate, easy to implement, suitable for the situation where the temperature changes before and after mixing are small, It is especially suitable for the measurement method and measurement device of the pulverized coal concentration in the primary air duct of the boiler in the intermediate storage type pulverization system

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