Gas detection probe using multi-phase catalyst alloy and far infrared ceramic filter and capable of performing back flushing washing and rapid calibration

Abstract

The invention relates to a gas detection probe using a multi-phase catalyst alloy and a far infrared ceramic filter and capable of performing back flushing washing and rapid calibration, and belongs to the field of safety protection, wherein the gas detection probe is suitable for catalytic combustion, semiconductor type gas sensors. According to the present invention, the filtering capacity is unaffected by humidity, the absorption rate on the detected gas is low, and the service life is long; the n-shaped porous polytetrafluoroethylene core shell, the internal porous multi-phase catalyst alloy, the internal negative ions and the internal far infrared ceramic catalyst assembly are the core components of the gas detection probe; the n-shaped porous polytetrafluoroethylene core shell has water repellency and provides non-invasion on most solvents, and the porous ceramic catalyst assembly provides irreversible adsorption and high reaction activity on sulfur-silicon-based gas while does not provide reaction activity on hydrogen, alkane gases and carbon monoxide gas, and does not adsorb, such that the sulfur-silicon-based interference gas can be efficiently filtered out; and with the standard gas input and the gas washing back flushing pipe component, the great convenience is provided for the gas sensor calibration and the back flushing washing, and the benefits are provided for the prolonging of the service life.

Description

technical field [0001] The invention relates to a gas detection probe which adopts a multiphase catalyst alloy and a far-infrared ceramic filter and can be cleaned and quickly calibrated, in particular to a porous multiphase catalyst alloy, a far-infrared and anion ceramic catalyst filter (For example: hydrogen sulfide, sulfur dioxide, organic silicon such as hexamethylsilane (HMDS), etc. can be filtered out) and high-resolution, high-stable flammable or toxic A gas detection probe belongs to the technical field of safety protection. The gas detection probe using multi-phase catalyst alloy and far-infrared ceramic catalyst filter is quite suitable for use in catalytic combustion gas sensors, semiconductor ceramic gas sensors, potentiostatic electrolytic electrochemical gas sensors, and Galvanic electrochemical gas sensors. Gas sensors and other types of gas sensors. It has an obvious filtering effect on interfering gases, but its absorption rate on the measured gas is very s...

AI Technical Summary

Problems solved by technology

[0002] At present, the selectivity of most gas sensors in the world cannot fully meet the requirements of various industries, especially in the resistance to interference gases such as hydrogen sulfide, sulfur dioxide, and organosilicon such as hexamethylsilane (HMDS). Technical flaws:

If the gas alarm does not have a filter protection device, as long as the air contains less than 1ppm of hexamethylsilane, the gas alarm will only work for a few seconds in the atmosphere, and its sensitivity will drop significantly

In addition, the current structure still cannot realize the backflush cleaning and quick calibration of the pollutants on the filter surface, and its operability is not good

[0009] Activated carbon is a conventional filter material at present, but unfortunately it has the following three disadvantages: (1) Activated carbon has no selectivity for the filtration effect of gas, in other words, it has the ability to filter out hydrogen sulfide, sulfur dioxide, and hexamethylsilane. At the same time, it also performs a certain degree of "adsorption" and "attenuation" on the monitored gases (such as methane, isobutane, carbon monoxide, hydrogen, etc.)

(2) The effective filtration pore size of activated carbon depends on the temperature and humidity of the environment, so the relationship between its filtration characteristics and environmental parameters is a multivariate function curve with a large uncertainty

(3) The adsorption of activated carbon molecules is a reversible physical adsorption mechanism, so its filtration capacity is short-lived and easily saturated

After saturation, desorption occurs, the activated carbon loses its adsorption capacity, and its life is short. It needs to be regenerated or replaced with fresh activated carbon.

Clearly, activated carbon is not ideal as a filter material for gas detection probes

[0010] In short, the current status is that most gas detection probes and gas alarms have a weak ability to filter out interfering gases (such as hydrogen sulfide, sulfur dioxide, organic silicon such as hexamethylsilane, etc.). The resistance to harmful gases is quite low, and the characteristics of water repellency and high humidity resistance are not good, which can no longer meet the requirements of many departments. Some foreign countries with advanced technology have included the filtering and suppression requirements for the above-mentioned interfering gases in their own industries. Standard or national standard, and our country is brewing

In a word, the main disadvantage of most domestic and foreign gas detection probes and gas alarms is the ability to filter out interfering gases (such as hydrogen sulfide, sulfur dioxide, organic silicon such as hexamethylsilane, etc.) Insufficient, lacks water repellency and high humidity resistance, cannot or is not convenient for backflush cleaning and quick calibration, poor operability

Images