在许多用低热值煤气作为燃料的工业窑炉上,采用了煤气和助燃空气双预热的节能技术,取得显著的节能效果。例如,在高炉热风炉上采用水——碳钢热管换热器,预热高炉煤气和助燃空气;在加热炉和热处理炉上采用金属管状换热器预热高炉煤气、混合煤气等。一般煤气都预热到200℃左右。煤气预热后,虽然能改善燃烧条件,提高燃烧温度,降低燃料消耗,但也不可避免地带来了如何 In many industrial kilns using low-calorific value gas as fuel, energy-saving technologies using dual preheating of gas and combustion air are adopted, and significant energy-saving effects are achieved. For example, water-carbon steel heat pipe heat exchanger is used on blast furnace hot blast stove to preheat blast furnace gas and combustion air; metal heat exchanger is used to preheat blast furnace gas and mixed gas on heating furnace and heat treatment furnace. General gas are preheated to about 200 ℃. Gas preheating, though it can improve the combustion conditions, improve the combustion temperature and reduce fuel consumption, but also inevitably brought about how