Ключевые слова: blast furnace, chimney, clean, cold wind, economic, emission, energy, energy saving, enterprise, environmental protection, exhaust gas, factory, flame, fluid, fog, gas, green, heavy industry, hot air stove, industry, ironmaking, led, light, medium, night, night view, pipeline, pollution, primary industry, release, residual pressure, second time, smoke, smoke exhaust, steel, steel making, steel plant, trt, waste heat,