The Discussion About The Coal Mine Shaft Environment's Influence On The Methane Catalytic Component

At present,the gas explosion is in the coal mine safety production one of most serious disasters. Because the methane (CH4) is the gas principal constituent, therefore the current coal mine uses to the methane gas strength examination to take the gas content the norm for reference. Based on the coal mine safety work's request, carries on the accurate prompt monitor to the damp content is continuously must, simultaneously is also one of coal mine safety production important safeguard measures. The examination methane gas strength's methods are many,like safelight law, heat conduction law, infrared spectrum absorption law,light interference method, ultrasonic wave law,gas semiconductor law as well as catalyzed combustion method and so on.Using the methane catalysis part examination gas density's methane warning miner's lamp, in the portable gas examination warning meter as well as the safe supervisory system's methane sensor occupied the coal mine gas instrumentation's dominant position, is the coal mine dynamic surveillance damp density effective tool, produced the very important function to the coal mine safety.Methane catalysis part examination gas density principle: Passes to the methane catalysis part by the constant operating current, heats up it to approximately 500℃about, the use sensitive unit causes the gas to the gas catalytic effect to have the flameless combustion on the part surface, emits the quantity of heat to cause the part temperature rise, increased the sensitive unit platinum wire resistance value, then through metering circuit survey sensitive unit resistance value change quantity, thus obtains the corresponding gas content. At present, the major part metering circuit favors the Stone electric bridge to take its core.This article prime task is as follows:(1) Discussion methane catalysis part examination methane gas chemical reaction mechanism;(2) Based on the methane catalysis part thermal equilibrium theory, the micro structure heat transfer theory analyzes the coal mine mine shaft environmental factor to its performance influence;(3) Based on the influence methane catalysis part various coal mines mine shaft environmental factor, has developed the methane catalysis part automatic detection systematic and the corresponding coal mine mine shaft environment simulation test equipment;(4) Based on the theoretical analysis, the automatic detection system as well as the experiment analog calculator has discussed the coal mine mine shaft various environmental factor influence methane catalysis part performance rule.This paper on the "coal mine methane catalytic components of the environmental impact of performance", based on methane catalytic components of methane gas detection of chemical reaction mechanism, the heat balance and the principle of micro-structure of heat transfer theory, drew the following conclusions:(1) Mine long-term high temperatures, high humidity environment easy to make methane catalytic components to "carbon deposition" phenomenon, and easy to increase their resistance to mass transfer process, leading to decreased sensitivity;(2) Reduce methane catalytic components catalyst particle diameter can increase their sensitivity;(3) Methane catalytic components of the zero drift, sensitivity and changes in the basic error of the coal mine in a short period of time temperature, humidity, wind speed less affected;(4) Dust on methane catalytic components greater impact on sensitivity, especially when the dust concentration of 10mg/m³, consecutive 3d after the operation, the sensitivity <12 mV/%CH₄;(5) H₂S will methane gas mixing with the sensitivity of catalytic element in a very short period of time dropped to a far less than 12mV/%CH₄, a catalyst poisoning;(6) Gas flow to (160～220) mL / min, methane catalytic components of the sensitivity of stability;(7) When the methane from the catalytic element to restore the environment of the environment, from the environment to restore the environment of the change detection process, the sensitivity will be seen tremendous changes.