Method and device for measurement of concentration and flow of pulverized coal

Abstract

The invention discloses a method and a device for measurement of concentration and flow of pulverized coal, which includes steps: firstly, selecting flow parameter measuring point I before mixing of pulverized coal conveying air flow with pulverized coal and flow parameter measuring point II after mixing on a primary air pipeline, wherein the flow parameter measuring point I before mixing is arranged at a flow stable position before mixing of the pulverized coal with air, and the flow parameter measuring point II after mixing is arranged at a position where the pulverized coal speed reaches the flow speed after mixing; determining flow pressure drop measurement pipe section L on a horizontal straight pipeline; and arranging static pressure measuring points for measuring pressure drop of the pipe section at two ends of the pipe section L; secondly, measuring static pressure P1, temperature T1 and full pressure P before mixing; thirdly, measuring static pressure P2 and pressure drop delta PLD; fourthly, calculating flow density 1 before mixing; fifthly, calculating flow speed V1 before mixing, sixthly, calculating pulverized coal concentration mu; and seventhly, calculating pulverized coal flow MP.

Description

Technical field [0001] The invention relates to the technical field of boiler pulverized coal concentration and pulverized coal flow measurement technology, in particular to a method and a measuring device for measuring pulverized coal concentration and pulverized coal flow. Background technique [0002] The distribution of pulverized coal among the burners of a pulverized coal boiler directly affects the safety and economy of the operation of the boiler equipment, and also has an important impact on the nitrogen oxide emission level of the coal-fired boiler. Measuring the concentration of pulverized coal in the primary air duct is an important means to monitor the operation of the burner. For pulverized coal boilers using an intermediate storage pulverized coal system, people used to measure the air flow and temperature before and after the pulverized coal conveyed air and the pulverized coal are mixed, and calculate the pulverized coal concentration in the primary air-pulverize...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate measurement of pulverized coal concentration in the prior art; to provide a method and device for measuring pulverized coal concentration and flow of pulverized coal; In small cases, it is especially suitable for the measurement method and device of pulverized coal concentration and pulverized coal flow in the primary air duct of the boiler in the intermediate storage bin type pulverizing system

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