In fact, due to the limitation of site conditions, the actual evaporation capacity of the equipment is different from the designed evaporation capacity.
For ordinary boilers, it is the rated evaporation capacity; For waste heat boiler, it is called nominal evaporation.
Heat released by flue gas = (inlet enthalpy x inlet temperature - outlet enthalpy x outlet temperature) x flue gas volume
The calculation method of equipment evaporation is as follows:
1. Knowing the quantity of flue gas and the temperature of inlet and outlet, we can get the heat of flue gas discharged by HRSG every hour;
2. It is necessary to know the feed water temperature and steam outlet temperature of the equipment, so that the heat absorbed by the equipment per kilogram of working medium can be obtained;
The quantity of steam produced by steam boiler per hour is called evaporation, also called "output" or "capacity". It is indicated by the symbol "d", and the common unit is t / h.
Evaporation capacity can be divided into rated evaporation capacity, economic evaporation capacity and maximum continuous evaporation capacity.
(1) Rated evaporation under rated steam pressure, rated steam temperature and rated feed water temperature, the hourly evaporation specified when the fuel specified in the design is used and the efficiency is guaranteed. The evaporation capacity indicated on the metal plate of boiler product is the rated evaporation capacity of equipment.
(2) In continuous operation, the economic evaporation is the evaporation with high efficiency. The economic evaporation is about 75% - 80% of the rated evaporation.
(3) Under the conditions of rated steam parameters, rated feed water temperature and design fuel, the maximum continuous evaporation is the maximum continuous evaporation that can be met in long-term continuous operation. At this time, the efficiency of the waste heat boiler will be reduced, so it should be avoided to operate at the maximum continuous evaporation capacity.
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