Coal mill outlet anti-blocking sampling device and installation method

Abstract

The invention provides a coal mill outlet anti-blocking sampling device and an installation method.The sampling device comprises a machine shell, a sampling pipe, a first-stage filter element, a dust sweeping assembly and a first air blowing pipe, the machine shell comprises a sampling part and a sealing part which are arranged in a separated mode, a sample inlet is formed in the first end of the sampling part, and a ceramic shell is installed on the peripheral wall of the sampling part; a sample gas inlet is formed in the first end of the sampling pipe, the first end of the sampling pipe is arranged in the sealing part, the primary filter element is arranged in the machine shell, the first end of the primary filter element is located in the sampling part and is adjacent to the sample inlet, the second end of the primary filter element is located in the sealing part, and the dust sweeping assembly is arranged in the machine shell and is used for sweeping the peripheral wall of the primary filter element; the first air blowing pipe is communicated with the inner cavity of the sampling part and is used for blowing dust in the sampling part out of the shell through the sample inlet. The embodiment of the invention is provided. The sampling device disclosed by the invention has the characteristics of multi-stage filtration, high-efficiency dust removal, difficulty in blockage and long service life.

Description

technical field [0001] The invention relates to the technical field of gas monitoring, in particular to an anti-blocking sampling device and an installation method at the outlet of a coal mill. Background technique [0002] With the increase of the number of large units, the problem of fire and explosion prevention of medium-speed mills is becoming more and more prominent, and the fire and explosion during the operation of medium-speed mills directly affect the stable and full production of the units. According to the requirements of "DLT5203-2005 Thermal Power Plant Coal and Coal Milling System Explosion-proof Design Technical Regulations": For bituminous coal and lignite with high combustion explosion sensitivity and volatile content, medium-speed mills or double-inlet and double-outlet coal mills are used for direct blowing. When the coal pulverization system is used, it is advisable to set up a coal mill CO monitoring system. [0003] In the related technology, the CO c...

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Problems solved by technology

[0003] In the related technology, the CO concentration at the outlet of the coal mill is detected by installing the corresponding measuring probe. However, the gas detection probe at the outlet of the coal mill used in the power plant is not practical. Due to the high dust and high humidity environment in the coal mill, the detection probe detects There is no reliable dust removal device in the sampling process, and it is easy to be blocked in a high-dust and high-humidity environment, making it difficult to operate stably for a long time

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