An analyzer for on-line measurement of air powder flow parameters in boiler pipes

Abstract

The invention provides an analyzer for the on-line measurement of boiler pipeline pulverized coal flow parameters. The analyzer comprises a signal conditioning unit, an AD acquisition unit, an FPGA dispatching unit, a CPU control unit, a communication unit, a power supply unit and a working status indicating unit. The signal conditioning unit converts 10 paths of sensor weak electric signals into voltage signals and transmits the voltage signals to the AD acquisition unit. The FPGA dispatching unit controls the collection and data caching of the AD acquisition unit and carries out data real-time interaction with a CPU. The CPU control unit is responsible for the task scheduling, data calculation and data interaction of the whole analyzer. The communication unit transmits measurement data and a result to a host computer in real time. The analyzer has the advantages of low cost, long-term and stable operation and a high precision of a calculation result and meets the application requirements of an industrial site.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and is mainly applied to the on-line measurement of flow parameters of primary air powder in boiler pipes of thermal power plants, and can also be applied to on-line measurement of flow parameters of other gas-solid two-phase flows. Air powder flow parameters include air powder flow velocity and pulverized coal concentration and other parameters, which are key parameters in the combustion optimization and control of power plant boilers. Background technique [0002] At present, the boiler air powder monitoring system used at home and abroad is a product developed by the temperature difference method or the impulse method measurement technology. The concentration measurement adopts the method of heat balance, that is, the energy relationship between hot air, coal powder and the mixture is obtained, and there are too many uncertain factors. , only relative measurement can be realiz...

AI Technical Summary

Problems solved by technology

Because microwaves are sensitive to the dielectric constant of electromagnetic waves, they are easily affected by coal composition, humidity, turbulence, electromagnetic interference, and the scattering of microwaves by pipelines and coal powder. It is also impossible to obtain a stable air powder flow rate and coal powder concentration. and other parameters

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