爆炸性气体混合物危险场所：2区。
For the dangerous sites with explosive air mixture: 2 division.
爆炸性环境中的爆炸混合物以气体、蒸气或薄雾形式连续出现或长时间存在的场所。
A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods.
研究结果表明，加热炉运行全过程中可燃气体含量较少且远低于烟气混合物爆炸极限，不存在爆炸危险；
The result shows that the content of combustible gas is far lower than the lower explosive limits and there is no the explosion danger in heating furnace.
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