Online primary air concentration measuring system and measuring method

Abstract

The invention discloses an online primary air concentration measuring system and a measuring method. The measuring system comprises a speed measurement unit, a force measurement unit and a concentration measurement and calculation unit, wherein the speed measurement unit comprises at least one group of rod sensors; each group of rod sensors comprises two electrostatic measuring rods; the two electrostatic measuring rods are arranged in parallel at the upstream and downstream of a to-be-measured primary air pipe; the force measurement unit comprises at least one group of force measurement devices; each group of force measurement devices comprises a force measuring chip, a force measuring rod and a force sensing element; the force sensing elements are arranged on corresponding force measuring rods; the force measuring chips are arranged at tail ends of the corresponding force measuring rods and connected with the force sensing elements; and the concentration measurement and calculation unit comprises a pre-amplification circuit, an A / D conversion module and a processor; the electrostatic measuring rods and the force sensing elements are sequentially connected by virtue of the pre-amplification circuit, the A / D conversion module and the processor. The online primary air concentration measuring system disclosed by the invention is capable of effectively realizing online real-time measurement, and measurement of supported primary air powder speed, relative concentration, relative flow and other parameters.

Description

technical field [0001] The invention belongs to the field of industrial measurement, especially to accurately measure the parameters of primary air-gas-solid two-phase flow such as velocity, relative concentration and relative flow, and relates to a system device for measuring by means of force measurement, which can greatly reduce or even solve the problem of Measurement error caused by uneven distribution of air powder in the pipeline. Background technique [0002] At present, ultrasonic method, microwave method and electrostatic measurement method are mainly used for the measurement of relative concentration at home and abroad. Since these methods are greatly affected by external physical parameters, most of them stay in the experimental stage, and there are few practical products. Even if there is a measurement accuracy for the concentration, it cannot meet the requirements of the current power plant. Nowadays, the measurement of liquid and gas concentration by means of...

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Problems solved by technology

[0002] At present, ultrasonic method, microwave method and electrostatic measurement method are mainly used for the measurement of relative concentration at home and abroad. Since these methods are greatly affected by external physical parameters, most of them stay in the experimental stage, and there are few practical products. Even if there is a measurement accuracy for the concentration, it cannot meet the requirements of the current power plant

Nowadays, the measurement of liquid and gas concentration by means of force measurement is widely used, especially the use of differential pressure flowmeters such as target flowmeters has been relatively mature. This method of force measurement avoids the interference of many external factors, making The measurement is more accurate, but it is rarely used in the measurement of gas-solid two-phase flow

In addition, inaccurate primary wind speed measurement, uneven pulverized coal concentration, and insufficient pulverized coal combustion have always been major problems faced by power plants at this stage. In addition, the country has proposed the concept of smart power plants, which urgently urges major power plants to improve and improve , in order to achieve the purpose of combustion optimization

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