實際上，由於現場條件的限製，設備的實際蒸發量與設計蒸發量還是有所差別的。
In fact, due to the limitation of site conditions, the actual evaporation capacity of the equipment is different from the designed evaporation capacity.
對普通鍋爐來說，是額定蒸發量；對餘熱鍋爐，它叫名義蒸發量。
For ordinary boilers, it is the rated evaporation capacity; For waste heat boiler, it is called nominal evaporation.
煙氣放出的熱量=（煙氣入口焓值x入口溫度-出口焓值x出口溫度）x煙氣量
Heat released by flue gas = (inlet enthalpy x inlet temperature - outlet enthalpy x outlet temperature) x flue gas volume
計算設備蒸發量方法如下：
The calculation method of equipment evaporation is as follows:
1、知道煙氣的量和進、出口溫度，可以得出煙氣經過餘熱鍋爐每小時放出的熱量；
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、要知道設備的給水溫度和蒸汽出口溫度，這樣可以得出每公斤工質經過設備吸收的熱量；
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;
蒸汽鍋爐每小時所產生的蒸汽數量，稱為蒸發量，又稱為“出力”或“容量”。用符號“D”表示，常用的單位是t/h。
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.
蒸發量有額定蒸發量、經濟蒸發量和大連續蒸發量之分。
Evaporation capacity can be divided into rated evaporation capacity, economic evaporation capacity and maximum continuous evaporation capacity.
(1)額定蒸發量在額定蒸汽壓力、額定蒸汽溫度、額定給水溫度下，使用設計規定的燃料並保障效率時所規定的每小時的蒸發量。鍋爐K8凯发登录入口金屬銘牌上標示的蒸發量，就是設備的額定蒸發量。
(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)經濟蒸發量在連續運行中，效率符合很高時的蒸發量稱為經濟蒸發量。經濟蒸發量約為額定蒸發量的75％～80％。
(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)大連續蒸發量在額定蒸汽參數、額定給水溫度和使用設計燃料的條件下，長期連續運行時所能符合的很大蒸發量稱為大連續蒸發量。這時餘熱鍋爐的效率會有所降低，因此應盡量避免它在大連續蒸發量下運行。
(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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