Net fume flow automatic blowing device and method

Abstract

The invention discloses a net fume flow automatic blowing device. The net fume flow automatic blowing device comprises a compressed air admission pipeline, wherein an electromagnetic valve C os arranged on the compressed air admission pipeline; the compressed air admission pipeline is connected with at least one group of air discharge pipelines; a corresponding electromagnetic valve is arranged at the connection of each group of air discharge pipeline and the compressed air admission pipeline, two air outlets of the electromagnetic valve are respectively connected with a sampling probe and a transmitter, and the electromagnetic valves and the electromagnetic valve C are both connected with a alternating current contactor, which is connected with a PLC (programmable logic controller) timing controller; and the alternating current contactor controls the electromagnetic valves, so that compressed air enters and blows the sampling probe and the transmitter. The invention also discloses an automatic blowing method. With the adoption of the scheme of the invention, a large amount of manpower and material resources are saved; the accuracy of measurement is improved; the continuity of data monitoring is guaranteed; and through an automatic water draining filter, a compressed air source is further purified, thus the reliability of the equipment is improved, and the service lives of the electromagnetic valves are prolonged.

Description

technical field [0001] The invention relates to an automatic purging device and method, in particular to an automatic purging device and method for net flue gas flow. Background technique [0002] The net flue gas flow measurement device adopts the measurement method of pitot tube plus differential pressure transmitter. The sampling position is located on the horizontal flue before entering the chimney after seawater desulfurization. It is heavy and often causes the measurement sampling probe to be blocked or blocked. In order not to affect the accuracy of the measurement, the sampling probe and transmitter need to be disassembled and purged every week. The reassembly takes nearly two hours, not only requires a lot of manpower and material resources, but also the purging causes the discontinuity of the measurement, which is not conducive to environmental monitoring, and the existing technology cannot solve these problems. Contents of the invention [0003] The object ...

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