Wind powder pipe online sampling device and method suitable for optical detection technology

Abstract

The invention provides an air powder pipe on-line sampling device suitable for an optical detection technology, which comprises a connecting pipe arranged below an air powder pipe; an air sealing unit; the sample loading pipe is arranged below the air sealing unit, is communicated with the connecting pipe and is used for accommodating the falling powder when the air sealing unit stops guiding air; the optical detection window is mounted below the sample loading pipe, and light beams of external optical detection equipment penetrate through the optical detection window so as to detect the powder on the optical detection window; the reverse blowing unit is arranged between the sample loading pipe and the optical detection window, removes powder on the optical detection window through reverse blowing, and comprises a reverse blowing cavity and a plurality of reverse blowing air inlets; the blowback cavity is of a multi-petal semi-ellipsoidal structure, first focuses of all the semi-ellipsoidal structures are circumferentially and uniformly distributed on a peripheral mounting area of the optical detection window, and second focuses of all the semi-ellipsoidal structures are circumferentially and uniformly distributed within the range of the optical detection window; the blowback air inlets are formed in the peripheral mounting area, and each blowback air inlet is located at the first focal point of the corresponding half-ellipsoidal structure.

Description

technical field [0001] The invention belongs to the technical field of automatic detection equipment for coal-fired power stations, and in particular relates to an online sampling device and method for air powder pipes suitable for optical detection technology. Background technique [0002] The coal quality of the furnace coal is particularly important to the safety, economy and environmental protection of the power plant operation, and to a certain extent determines the overall operating characteristics of the coal-fired boiler and even the coal-fired power plant. With the steady advancement of my country's "building a new power system with new energy as the main body", coal-fired power stations have gradually changed from the status of the main power supply to the regulating power supply. The operation mode, boiler rapid combustion adjustment and fine control have become necessary means, and the real-time monitoring of coal quality information into the furnace has become a ...

AI Technical Summary

Problems solved by technology

However, optical detection puts forward higher requirements for the sampling device: on the one hand, optical detection needs to maintain a relatively clean window, so as to maintain a good laser transmittance and ensure detection accuracy; on the other hand, optical detection requires The amount of sample is small, and it is easily affected by residual samples, thus affecting the accuracy of the test results

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