Study On The New Method For Methane Detection

Chapter 1: Methods and principle for detecting methane are introduced. Present research situation about mine gas is summarized. Advantages and disadvantages are appraised about each method and apparatus.Chapter 2: A new method for detecting methane indirectly is proposed, according to changes in volume owning to burning. Experimental plan is designed by this principle. And experimental system is built. Various parts in the system have been carried on inspecting. One kind of methane detector has been developed, which is used to initial survey of methane. The system to the methane working curve equation is y=28.667x-0.0189 (r=0.9976), the relatively standard deviation is 16.3%, conforming to the related international standard (<±25%).Chapter 3: Characteristics of infrared spectrum and scanning electron microscope of carbon nanometer tubes, used to modify catalysis part, are inspected. Taking catalyzing articles as carrier, carbon nanotubes as surface modified materials, we designed working principle diagram. Catalyzing articles modified by carbon nanotubes are constructed to detect methane. Response sensitivity and the working curve of this system to methane are studied. Sensitivity of catalyzing part increased after modifying by carbon nanotubes.Chapter 4: Semi conducting material-tin peroxide is selected for sensitive substance to methane. Selection of tin tetrachloride and two chloride as a raw material used coprecipitation into nano-tin oxide Semiconductor membrane of tin peroxide is prepared by coprecipitation, Characteristics of infrared spectrum and transmission electron microscope analyzing are inspected about tin peroxide membrane. Simultaneously, Fe³⁺ is blended to this membrane. Experimental plan is designed by this principle. And experimental system is built. And performance parameters are reviewed, such as, sensitivity and so on. The results showed that: tin oxide semiconductor testing of methane has a prospect for other ion doping to be further studied. Chapter 5: Three kinds of methods used for detecting methane are compared, such as, new method, catalyzing articles modified by carbon nanometer tube, and semiconductor tin peroxide, which indicates accuracy and sensitivity of new method are better than others. Further researching work about this system is expected.