High temperature flue gas sampling line with constant power heating and heat tracing function

Abstract

The present invention relates to the technical field of sampling and detection, in particular to a high-temperature flue gas sampling line with constant power heating and heat tracing function. It includes several sampling pipes, the outer wall of the sampling pipes is wrapped with a metal braid, and the metal braids on the two sampling pipes are respectively connected to the power supply. Wrapped as a whole, the heating wires are respectively connected to the metal braiding layer connected to the power supply, the outer side of the heating wires is also wrapped with a thermal insulation layer, and the surface of the heating wires is also provided with a temperature sensor, between the temperature sensor and the heating wires Provided with insulating tape. The heat field of the invention is very uniform, the heating area is large, the load of the heating wire is very low, and it can be used in high temperature occasions of about 170 degrees.

Description

technical field [0001] The invention relates to the technical field of sampling and detection, in particular to a high-temperature flue gas sampling line with a constant power heating and heat tracing function. Background technique [0002] High-temperature flue gas usually refers to the gas produced during the combustion of various industrial boilers from fixed pollution sources such as garbage incineration, coal-fired carbon, and gas. This is a relatively special medium. Usually, the temperature of the flue gas is about 140 degrees. In special cases, it can reach 180 degrees. In addition, dust and acidic substances such as S02 and NOX generally exist in the flue gas. These acidic substances and dust will condense into liquid media due to the temperature drop during the extraction process of a specific flue gas. Components are lost, which is a very difficult problem during flue gas sampling. [0003] The existing heat tracing methods often use self-controlling electric hea...

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Problems solved by technology

[0003] The existing heat tracing methods often use self-controlling electric heating cables in low-temperature occasions. Since the maximum heating temperature of self-controlling electric heating cables is 120 degrees, high-temperature constant-power electric heating cables are often used for heating above 120 degrees. The heating band and the heated or heated flue gas pipe are in the form of line contact. The heat transfer between the electric heating band and the flue gas pipe is poor, and the thermal field is uneven, which also limits its use in higher temperature occasions, such as above 160 degrees. Occasions, it is very difficult to use and easy to damage

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