Capacity And Parameters Of Boilers
Capacity and parameters of boiler includes evaporation, pressure, heat capacity, temperature.
Evaporation of boilers
During long-term operation of steam boiler continuously, the steam generated per hour is called evaporation of this boiler. The common units of evaporation is t/h. The evaporation value of boiler on nameplate and in design information represents the rated evaporation. The rated evaporation refers to the evaporation generated by boiler under the condition that no fouling on heating surface, using the original designed fuel, water temperature and designed working pressure are rated. The amount of evaporation boiler produced per hour. In daily operation, the maximum amount of steam produced by the boiler per hour is called the maximum evaporation, then the thermal efficiency of the boiler will be reduced.
Heat capacity
The rated heat capacity of boiler refers to the heat amount per hour in hot water of a long-term and continuous operating hot water boiler, that operates at rated return water temperature, pressure, and the specified circulating water. The unit of it is MW. 0.7MW heat from hot water boiler equals to the heat of 1t steam from steam boiler.
Pressure
Relative pressure is the pressure measured by pressure meter, which takes the local atmospheric pressure as a measurement starting point, represented by P. The pressure generated in a different way in steam boiler and hot water boiler. In a steam boiler, the water turn from liquid into gas after absorbing heat and its volume increases. The boiler is a closed container, so the boiler pressure will rise. The pressure of hot water boiler comes from the upper tank or the pump worked for circulating water. 1kgf /cm2 is approximately equal to 0.1Mp.
Temperature
The temperature on the nameplate of boiler is the temperature at the outlet of the boiler, also known as the rated temperature. For non-superheater steam boilers, the rated temperature is the steam temperature at rated working pressure. For steam boilers with superheater, the rated temperature refers to the steam temperature at the outlet of the superheater. For hot water boilers, the rated temperature is the temperature of the water out of the boiler
