How to control the water content and calorific value in the combustion process of oil-fired boiler?

There are many skill indicators involved in the operation of oil-fired boiler, some of which are variables. We must master the relationship between variables and working effect of oil-fired boiler to realize better regulation.

Let us talk about the variable water content first. Usually, different kinds of fuel have different water contents,which is mainly decided by the kind and storage method of fuel. To ensure the stable combustion of oil-fired boiler, the fuel should be dried to reduce the water content before being used.

The increasing of water content can lower the heat storage temperature of oil-fired boiler's furnace  and increase the possibility of fuel's incomplete combustion. Moreover, high water content can result in the difficulty of ignition, which can further affect the combustion speed, lower the inner furnace temperature to add the heat loss caused by incomplete combustion for mechanical and chemical reasons.

In the combustion process of oil-fired boiler, water content can consume a large amount of heat due to evaporation and vaporization, so the fuel with high water content can produce large-volume flue gas after combustion, which can result in large heat loss and reduce the thermal efficiency of oil-fired boiler.

Another disadvantage is that the volume of flue gas generated by oil-fired increases, so the electric energy consumed by the induced draft fan also increases, which accelerates the flow rate of flue gas and makes the combustion move up. Thus, it is difficult to ensure the power balance of grate combustion and it also can accelerate the abrasion of the heating surface at the end of the furnace.

In addition, the other variable needed to be controlled in the combustion process of oil-fired boiler is calorific value mainly consisting of high-order calorific value and low-order calorific value. The former refers to the total heat released by the complete combustion of fuel within per unit time of oil-fired boiler. The latter refers to the total heat except the latent heat caused by vaporization in the process of combustion.