实际上，由于现场条件的限制，设备的实际蒸发量与设计蒸发量还是有所差别的。
In fact, due to the limitation of site conditions, the actual evaporation capacity of the equipment is different from the designed evaporation capacity.
对普通锅炉来说，是额定蒸发量；对余热锅炉，它叫名义蒸发量。
For ordinary boilers, it is the rated evaporation capacity; For waste heat boiler, it is called nominal evaporation.
烟气放出的热量=（烟气入口焓值x入口温度-出口焓值x出口温度）x烟气量
Heat released by flue gas = (inlet enthalpy x inlet temperature - outlet enthalpy x outlet temperature) x flue gas volume
计算设备蒸发量方法如下：
The calculation method of equipment evaporation is as follows:
1、知道烟气的量和进、出口温度，可以得出烟气经过余热锅炉每小时放出的热量；
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、要知道设备的给水温度和蒸汽出口温度，这样可以得出每公斤工质经过设备吸收的热量；
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;
蒸汽锅炉每小时所产生的蒸汽数量，称为蒸发量，又称为“出力”或“容量”。用符号“D”表示，常用的单位是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.
蒸发量有额定蒸发量、经济蒸发量和大连续蒸发量之分。
Evaporation capacity can be divided into rated evaporation capacity, economic evaporation capacity and maximum continuous evaporation capacity.
(1)额定蒸发量在额定蒸汽压力、额定蒸汽温度、额定给水温度下，使用设计规定的燃料并保障效率时所规定的每小时的蒸发量。锅炉产品金属铭牌上标示的蒸发量，就是设备的额定蒸发量。
(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)经济蒸发量在连续运行中，效率符合很高时的蒸发量称为经济蒸发量。经济蒸发量约为额定蒸发量的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)大连续蒸发量在额定蒸汽参数、额定给水温度和使用设计燃料的条件下，长期连续运行时所能符合的很大蒸发量称为大连续蒸发量。这时余热锅炉的效率会有所降低，因此应尽量避免它在大连续蒸发量下运行。
(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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