Research of Dangerous Medium Measurement Method in Special Environment

摘要

In the experiment process of electrical arc plasma coal thermal cracking, the negative pole gas play a very important role in the process of plasma firing arc thermal cracking. As limited of experiment equipment and process pipe lines, according to the requirement of process in experiment the N2 or H2 pass through the negative gas pipe, the measurement precision is low when the gasses density ratio is more than 10. In the process and experiment, the H2 is the carrier of the crude material and the product is the C2H2. They are all the easy firing and explosive gases. The pipe diameters are small in the process. The invest is high and some problem must deal with in the construction for process pipe lines and measurement devices if using traditional design strategy to constructing the explosion proof system. Object to the problem above, the paper projected a kind of circuit for measuring the temperature. The circuit is simple, reliable, low price and essential safety. Another strategy is adapted harmony control to the negative gases to solve the problem of measuring gases in same pipe line. The measurement and control strategy and system can fulfill the requirement of the plasma coal thermal cracking experiment and provide a method for measuring dangerous medium in similar process.