A smoke and dust heating sampling gun

Abstract

The invention provides a smoke and dust heating sampling gun, which at least includes a smoke and dust sampling cylinder and a heater. A filter cartridge is installed inside the soot sampling cylinder, the heater is a spring heating coil with a built-in thermocouple, and a spring heating coil is tightly sleeved on the outside of the soot sampling cylinder and the soot sampling tube, and the spring heating coil is a double-tube spring coil. One end of two spring coils is connected to form a spring heating coil, and the other end is respectively connected to a power line to form the positive and negative poles of the spring heating coil; an outer tube is provided outside the spring heating coil, and a temperature controller and a power plug are provided on the outer tube to control the temperature. The device is connected in series between the spring heating coil and the power plug; the sampling gun can heat the filter cartridge and the sampling tube at the same time, and realize automatic heating and temperature control to ensure smooth sampling, accurate sampling results and good sampling effect.

Description

technical field [0001] The invention relates to a smoke sampling gun, in particular to a smoke heating sampling gun capable of heating a filter cartridge and a sampling pipe at the same time. Background technique [0002] Smoke and dust sampling is an important link in thermal power plant boiler emissions, equipment performance tests and environmental protection supervision. Smoke and dust sampling is generally carried out through smoke and dust sampling guns. In practical applications, the humidity of the dust in some flue ducts is relatively high. When using a traditional non-heating smoke sampling gun for sampling, due to the large temperature difference between the inside and outside of the sampling gun, condensed water will be generated in the exhaust pipe of the sampling gun. As the sampling time increases, various gases and dust from the flue are mixed into the condensed water, and they will crystallize in the exhaust pipe over time, causing the exhaust pipe to be blo...

AI Technical Summary

Problems solved by technology

In practical applications, the humidity of the dust in some flue ducts is relatively high. When using a traditional non-heating smoke sampling gun for sampling, due to the large temperature difference between the inside and outside of the sampling gun, condensed water will be generated in the exhaust pipe of the sampling gun. As the sampling time increases, various gases and dust from the flue are mixed into the condensed water, and they will crystallize in the exhaust pipe over time, causing the exhaust pipe to be blocked, thus affecting the use of the sampling gun; moreover, the filter cartridge will be wetted if the humidity of the flue gas is too high When the sampling filter cartridge is wet and absorbs water, the sampling resistance will increase and the sampling filter cartridge will be blocked or the sampling filter cartridge will be broken, resulting in sampling failure or failure. The result is abnormal, so the quality of smoke sampling cannot be guaranteed

[0003] In the prior art, most smoke sampling guns use a structure in which a spiral electric heating tube is directly wound on the filter cartridge to heat the filter cartridge of the smoke sampling gun. Since the heating tube is directly in contact with the smoke, the water vapor and dust particles in the smoke will damage the heating tube. , in order to protect the heating tube, the manufacturer coats the heating tube with an anti-stick coating in order to avoid the erosion of the heating tube by smoke and dust and to insulate the heating tube from the filter cartridge. However, the anti-stick coating coated on the heating tube It will have a certain impact on the heating and heat preservation effect of the heating tube, and the coating is easily damaged, and the insulation between the heating tube and the filter cartridge cannot be guaranteed

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