Total-cross-section fly ash sampling and collecting device and automatic control method

Abstract

The invention relates to the technical field of power plant heating power, in particular to a total-cross-section fly ash sampling and collecting device and an automatic control method. The total-cross-section fly ash sampling and collecting device comprises a fly ash sampling gun and a fly ash sampling probe for sampling fly ash, a fly ash suction sampling device for providing a power source andcollecting fly ash, a primary blasting blowing device and a secondary blowing gradient blowing device, wherein the fly ash sampling probe is connected with the fly ash sampling gun, the fly ash suction collecting device for providing the suction power source, the primary blasting blowing device and the secondary blowing gradient blowing device are connected with the fly ash sampling gun through independent controllers, and a sampling hole for sampling is also formed in the fly ash sampling gun. According to the total-cross-section fly ash sampling and collecting device and the automatic control method, automatic sampling is realized through arrangement, the maintenance quantity and risk of manual sampling are reduced, the rapid and efficient sampling process is realized, and the reliability and safety of long-term execution behavior of fly ash sampling are guaranteed.

Description

technical field [0001] The invention relates to the thermal technical field of power plants, and more particularly relates to a full-section fly ash sampling and collecting device and an automatic control method. Background technique [0002] The carbon content of fly ash in boilers is an important indicator of the combustion efficiency of coal-fired boilers in thermal power plants. Real-time detection of carbon content in fly ash is helpful to guide the operation to adjust the air-to-coal ratio correctly, improve the level of boiler combustion control, and reasonably control the fly ash content. The index of carbon quantity is conducive to reducing the cost of power generation and improving the economy of unit operation. Especially in the field of fly ash application, detecting the carbon content in fly ash is the most restrictive factor for its comprehensive utilization. [0003] There are many traditional online measurement methods for the carbon content of fly ash. The ...

AI Technical Summary

Problems solved by technology

The sampling location can only be at the bag ash outlet of the dust collector downstream of the flue, and the sampling method is manual, which leads to poor effectiveness of fly ash sample collection, and there are errors between the analysis value and the measured value; in addition, because the pressure control at the bag ash outlet fluctuates greatly, When the negative pressure is high, the amount of ash falling in the ash hopper is small, and it is difficult to collect the fly ash manually. Sometimes the fly ash is taken away by the negative pressure and cannot be collected. During the collection process, the sudden slight positive pressure of the boiler combustion will cause high-temperature ash to be ejected , personnel burns

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