A heating type smoke sampling gun

Abstract

The invention provides a heating type smoke and dust sampling gun, which at least includes a smoke and dust sampling cylinder and a heater. , a filter membrane is installed inside the smoke sampling cylinder, a pressure plate is provided at the air outlet of the smoke sampling nozzle, a gland is set on the pressure plate, the filter membrane is tightly sandwiched between the pressure plate and the smoke sampling cylinder, and the heater includes a heating rod And the spring heating ring with built-in thermocouple, the heating rod is installed outside the smoke sampling tube, the spring heating ring is tightly sleeved on the smoke sampling tube, the heater is equipped with an outer tube, and one end of the outer tube is fixed on the gland and the smoke sampling tube There is a temperature controller and a power plug on the other end; the sampling gun can heat and keep the filter membrane and 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 heating type smoke sampling gun capable of heating a filter membrane and a sampling tube 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...

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 excessive humidity of the flue gas will wet the filter When the sampling filter is wet and absorbs water, the sampling resistance will increase and the sampling filter will be blocked or the sampling filter will be broken, resulting in the inability or failure of sampling. 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 to heat the filter 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. 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 cannot be guaranteed

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