The appearance of black smoke in grate furnaces is due to insufficient mixing, the crux of which lies in the furnace arch.
火床炉冒黑烟是一个混合不良问题，而混合的关键在于炉拱。
2
This paper has mainly introduced when using arch tube-plate and screw smoke-tube to reform the DZ-type horizontal packaged boiler. Good results of saving on energy has been got.