In a stoker-fired firetube boiler with a heating surface area of 62 m2, what is the steam discharge capacity required from the safety valve?

To determine the required steam discharge capacity from the safety valve for a stoker-fired firetube boiler, knowledge about how to calculate the steam flow rate based on the heating surface area is essential. In this case, the boiler has a heating surface area of 62 m².

In general, the steam discharge capacity can be estimated using empirical relationships that consider the heating surface area and the properties of the steam generated. A common rule of thumb is that for firetube boilers, a rough estimate shows that 1 m² of heating surface can produce approximately 30-35 kg/h of steam, depending on the boiler design and operational parameters.

Calculating the steam discharge capacity:

1. Using an average of 35 kg/h per m², we multiply:

• ( 62 m² \times 35 kg/h = 2170 kg/h ).

Given the options available:

• Answer A is 2108 kg/h, which is very close to the estimated value derived from standard calculations.

This closeness indicates that option A reflects a realistic capacity for a boiler of this size and type, aligning with established engineering standards and safety margins typically employed when sizing safety valves.

The other values provided do not align as closely with the empirical estimates