Flue gas sampling gun and operating method thereof

Abstract

The invention provides a flue gas sampling gun and an operating method thereof. The flue gas sampling gun mainly comprises the following multiple parts: a sampling gun nozzle, a standard S-shaped pitot tube, a bend, a straight tube, a sampling gun inner barrel, a sampling gun outer barrel, a heating and temperature measuring element, a thermal insulation material, a temperature sensor and a plugging block. The flue gas sampling gun has the main advantages that firstly, the sampling gun simultaneously is provided with a sampling pipeline heating element and a water jacket inner barrel structure, heating can be started when the temperature of a sampling pipeline in the sampling gun is lower than the lower limiting value of a set temperature, and components in the collected gases are prevented from being condensed; cold water cooling can be started when the temperature of the sampling pipeline in the sampling gun is higher than the upper limit of the set temperature, the temperature in the sampling pipeline is regulated, and internal components in the sampling gun are protected; and secondly, the pitot tube and the temperature sensor are integrated into a sampling gun main body, the outer surface is of a cylindrical structure, and the sampling gun is provided with a conical plugging block, so that a gap between the sampling gun and a sampling hole can be conveniently plugged during sampling, and the flue gas sampling gun is high in applicability and is particularly suitable for achieving automatic plugging in an online sampling system.

Description

technical field [0001] The invention belongs to the field of environmental pollution analysis and monitoring, and mainly relates to the sampling analysis of target pollutants in flue gas, in particular to a flue gas sampling gun used for sampling analysis or monitoring of dioxins in flue gas and its operating method . Background technique [0002] At present, flue gases from municipal waste incineration, hazardous waste incineration, and industrial furnace emissions from thermal power plants contain dioxins and other component pollutants, among which dioxins are a type of highly toxic organic pollutants. In order to control and reduce the emission of air pollutants, it is necessary to sample and monitor these stationary pollution sources. [0003] In the environmental monitoring of exhaust emissions from fixed pollution sources such as flues, chimneys, and exhaust pipes, the sampling and monitoring of particulate matter and gaseous pollutants mainly include manual sampling,...

AI Technical Summary

Problems solved by technology

According to the national environmental protection standard GB / T16157-1996, there are clear requirements for the installation positions of the pitot tube measuring hole, the sampling gun hole and the thermocouple. Generally, the pitot tube and the thermocouple are installed and fixed on the outer wall of the cylindrical sampling gun barrel. Therefore, the overall section of the sampling gun is irregular in shape, and the plugging operation is inconvenient

In the actual sampling operation, it is necessary to place the sampling gun mouth in the sampling hole of the chimney, and seal the gap between the sampling gun and the sampling hole with worn cloth or a special device to prevent the smoke from leaking from the gap and causing damage to the flue. Steady airflow creates interference, and in automated continuous on-line sampling equipment, this crude method is not applicable

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