Sampling device and method for mercury in high temperature flue gas

Abstract

The invention relates to the field of mercury sampling in high temperature flue gas, in particular to a sampling device and a method for mercury in high temperature flue gas. The device comprises a sampling gun system, a condensation system, a flue gas flow control system, and a mercury test and analysis system. The sampling gun system comprises a sampling probe, a sampling tube I, a sampling tubeII, and a cooling water system provided outside the sampling tube I. The sampling probe is connected to the rear of the sampling tube I, and the sampling tube II is connected to the rear of the sampling tube I. The sampling probe comprises a top that is gradually smaller in size. An air inlet is provided at the top. The inner diameter of the air inlet is 0.05-0.1mm. The length of the top is 1-3mm. The sampling probe has a diameter of 0.5-1 mm. The diameter of the top gradually increases from the air inlet to the rear of the sampling probe. In the device of the invention, the front end of thesampling probe is designed as a structure with a gradually decreasing diameter. After the gas enters the structure, the sudden expansion of the space causes the gas to suddenly expand, thereby quenching the high-temperature flue gas, so that the properties of the high-temperature flue gas can remain unchanged.

Description

technical field [0001] The invention relates to the field of mercury sampling in high-temperature flue gas, in particular to a sampling device and method for mercury in high-temperature flue gas. Background technique [0002] Mercury (Hg) is one of the most toxic heavy metal elements in the environment. It not only causes damage to the environment, but also can enter the human body through the biological chain to cause greater harm. Elemental mercury has become the main control object of air pollutants due to its characteristics of volatility, persistence of action, bioaccumulation, and ability to convert into more toxic methylmercury. Only by sampling and analyzing the mercury in the flue gas can the mercury emission be controlled at low cost and high efficiency. [0003] At present, the sampling of mercury in high-temperature flue gas will largely cause the properties of mercury in high-temperature flue gas to change after sampling. The determination of the nature of mer...

AI Technical Summary

Problems solved by technology

[0003] At present, the sampling of mercury in high-temperature flue gas will largely cause the properties of mercury in high-temperature flue gas to change after sampling. The determination of the nature of mercury in flue gas brings great errors and interference

The above problems all have a certain impact on the cost reduction and high efficiency removal of mercury control process

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