Pulverized coal concentration online monitoring system

Abstract

The invention discloses a pulverized coal concentration online monitoring system, which comprises a control cabinet and a measuring device, wherein the measuring device is installed on a wind pipe which is connected with a boiler, the output end of the measuring device is connected with the control cabinet, the measuring device comprises a measuring probe and a differential pressure transmitter, the measuring probe comprises a primary wind speed probe, a primary concentration probe, a secondary wind speed probe, a secondary concentration probe, a tertiary wind speed probe and a tertiary concentration probe, wherein the primary wind speed probe and the primary concentration probe are installed on a primary wind pipe, the secondary wind speed probe and the secondary concentration probe are installed on a secondary wind pipe, the tertiary wind speed probe and the tertiary concentration probe are installed on a tertiary wind pipe, and the measuring probe is connected with the differential pressure transmitter through a pressure transmission pipe. Through the way, the pulverized coal concentration online monitoring system has strong interference resistance and stable signals, the wind speed and the pulverized coal concentration of the boiler can be accurately provided, the reaction sensitivity and reliability to the pulverized coal concentration and the variation of the wind speed are high, the accuracy of the measured data is high, and the application range is wide.

Description

technical field [0001] The invention relates to the field of thermoelectric measurement, in particular to an online monitoring system for pulverized coal concentration. Background technique [0002] Due to the different resistance characteristics of the pulverized pipelines in the boiler pulverization system, and the poor uniformity of pulverized coal and air distribution at the outlet of the coal mill, the uniformity of the pulverized air in the boiler will be poor, resulting in deflection of combustion in the furnace, slagging, and Deterioration of combustion conditions, high carbon content in fly ash, etc. [0003] As the country attaches great importance to environmental protection, the emission of nitrogen oxides has attracted increasing attention. If there is no reliable and accurate means of monitoring the concentration of primary air pulverized coal and air volume, the excess air coefficient at the outlet of each burner in the furnace cannot be effectively controlled...

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Problems solved by technology

[0002] Due to the different resistance characteristics of the pulverized pipelines in the boiler pulverization system, and the poor uniformity of pulverized coal and air distribution at the outlet of the coal mill, the uniformity of the pulverized air in the boiler will be poor, resulting in deflection of combustion in the furnace, slagging, and Deterioration of combustion conditions, high carbon content in fly ash, etc.

[0003] As the country pays more attention to environmental protection, the emission of nitrogen oxides has attracted more and more attention. If there is no reliable and accurate monitoring method for primary air pulverized coal concentration and air volume, the excess air coefficient at the outlet of each burner in the furnace cannot be effectively controlled, and optimization Adjusting the combustion in the furnace fails to achieve the purpose of high-efficiency and low-pollution combustion

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