Smoke heating and sampling gun

Abstract

The invention provides a smoke heating and sampling gun which at least comprises a smoke sampling cylinder and a heater, wherein a smoke sampling nozzle communicated with the smoke sampling cylinder is arranged at the front end of the smoke sampling cylinder; a smoke sampling pipe communicated with the smoke sampling cylinder is arranged at the rear end of the smoke sampling cylinder; a filter cartridge is arranged inside the smoke sampling cylinder; the heater is a spring heating ring in which a thermocouple is arranged; spring heating rings are tightly arranged outside the smoke sampling cylinder and the smoke sampling pipe in a sleeving manner; the spring heating rings are double-tube spring rings; one ends of the two spring rings are connected with each other to form a spring heating ring, and the other ends of the two spring rings are respectively connected with a power line to form positive and negative poles of the spring heating rings; an outer pipe is arranged outside the spring heating rings; a temperature controller and a power plug are arranged on the outer pipe; and the temperature controller is connected in series between the spring heating rings and the power plug. According to the sampling gun, the filter cartridge and the sampling pipe can be simultaneously heated, automatic heating and temperature control are realized, smooth sampling is guaranteed, the sampling result is accurate, and the sampling effect is good.

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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