Abstract: This article selects acetone as the research object. We test acetone vapor explosion limit and the inhibition effect of nitrogen, carbon dioxide, heptafluoropropane by HY - 12474 type explosion limit test device. In comparison, when acetone vapor quit explosive range, the explosion inhibition concentrations of nitrogen, carbon dioxide and heptafluoropropane are 32%，26%， 13% respectively. With the addition of inert gas, nitrogen and carbon dioxide gradually reduce the flame propagation speed of acetone vapor. With the addition of heptafluoropropane, the flame propagation speed of acetone vapor will increase slightly, and then decrease as lean- burn condition; The flame propagation rate has been reduced in the same way as that of nitrogen and carbon dioxide as stoichiometric ratio and rich-burn condition. From the data point of view, heptafluoropropane has the highest explosion suppression efficiency, but it needs to be used within a reasonable concentration range, followed by carbon dioxide and nitrogen. The conclusion provides an important theoretical basis for the optimization of gas suppressant and the research and development of gas explosion suppression device.

Key words: acetone vapor, explosion limit, explosion suppression;explosion promotion