China is carrying out a massive coal to natural gas campaign. The cast iron boiler has greatly reduced the dust infection, and the emission of toxic gases such as nitrogen oxides has been clamped. Cast iron boiler energy consumption index is the next important thing.
According to the investigation of relevant departments, the heat consumption of cast iron boiler mainly occurs in these two parts: unreasonable combustion air-fuel ratio and heat loss of flue gas emission. Reduction of flue gas emission heat loss will be done in cast iron boiler tail with chimney heat recovery and recovery assembly, or in FGR boiler based on better type.
Research on unreasonable combustion air-fuel ratio: traditional cast iron boiler should be equipped with injection type combustion engine, which can not be adjusted dynamically. 60% of cast iron boilers should be equipped with mechanical forced draft burners. The reasons for the unreasonable air-fuel ratio are as follows: the unreasonable air-fuel ratio is more important, which can be divided into two categories: when the air flow is too much, there will be unlimited excess cold air to be heated, resulting in the increase of operation cost of cast iron boiler and the decrease of energy consumption index of cast iron boiler; When the air flow is not up to the standard, it will cause insufficient combustion and the energy consumption index of cast iron boiler will decrease.
Keywords: Qingdao boiler