High-temperature flue gas sampling line with constant-power heating and tracing functions

Abstract

The invention relates to the technical field of sampling detection, in particular to a high-temperature flue gas sampling line with constant-power heating and tracing functions. The high-temperature flue gas sampling line comprises a plurality of sampling pipelines, wherein metal braid layers wrap the outer walls of the sampling pipelines; the metal braid layers on two sampling pipelines are respectively connected with a power supply; an insulating layer wraps the outside of each metal braid layer; all sampling pipelines are lapped into a whole body by a heater strip; the heater strip is respectively connected with the metal braid layers of the power supply; a heat-preservation layer also wraps the outer side of the heater strip; a temperature sensor is also arranged on the surface of the heater strip; and an insulating tape is arranged between the temperature sensor and the heater strip. The high-temperature flue gas sampling line is very even in thermal field, large in heated area and low in load of the heater strip, and can be applied to a high-temperature occasion at about 170 DEG C.

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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