Which is better: a gas boiler or a coal boiler?

When it comes to boilers, most people are likely familiar with them. Those who are well-versed in boilers know that there are many types, with the most common being gas boilers and coal-fired boilers. Many people ponder which one is better. Here, I can only say that each has its merits. As boilers, they still have many differences.

1.Burning Method

Coal-fired boilers, as the name implies, are boilers that primarily burn coal. Gas boilers utilize a mixture of coke oven gas and waste gases, which are then injected directly into the burners by four burners.

2.Combustion Products

Coal-fired boilers produceSO2，SO3，NOxAsh and moisture, which are pollutants, are produced mainly after the combustion of gas boilers.CO2No Chinese content provided.H2OThere is no Chinese content provided for translation.SO2，SO3AndNOxEmissions are significantly lower than those from coal-fired boilers.

3.Ventilation Methods

Coal-fired boilers typically utilize negative pressure combustion, with the basic combustion process being achieved through the combined efforts of fans and draught fans. In the process of coal combustion, a large amount of air is required. Due to the air leakage in the furnace wall flue, the excess air coefficient can reach2.1-2.5Gas boilers utilize micro-positive or micro-negative pressure combustion, requiring minimal air volume. The air in the burners can be fully pre-mixed with natural gas. During micro-positive pressure combustion, there is no air leakage coefficient in the furnace walls and flues. The air coefficient at the outlet of the flue during operation can be1.05-1.20。

4.Fuel Explosive

Coal-fired boilers are safe in combustion, as they are not prone to explosion. Gas boilers can explode when exposed to open flame.

5.Boiler Automatic Control

Due to factors such as coal type, material layer thickness, air volume, induced air volume, and air-coal ratio, it is difficult for coal-fired boilers to automatically adjust operating parameters based on load. Gas-fired boilers are less affected by these factors. The valve size of the burner can be adjusted according to the load, facilitating automatic control.