The issue of water replenishment in the boiler
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For a circulating fluidized bed boiler with a capacity of 130 tons per hour and a pressure of 98 kilograms, is it normal for it to evaporate 130 tons of water into steam per hour? And does that mean 130 tons of water need to be added as make-up water per hour? What does the make-up water ratio refer to in this context? There is a constant value of 20%; some people say that for a boiler with a capacity of 130 tons, the amount of make-up water required is 130 * 20% = 26 tons per hour. Is that correct? Please give me some guidance!
The daily water replenishment amount should be the amount of water condensed from steam multiplied by the operating hours, plus the amount of wastewater to be discharged; this wastewater amount can be estimated at 15% (an empirical figure). That’s all I know.
It’s not like that. The normal water supply volume for a boiler is the sum of the boiler’s evaporation rate and the amount of water removed through slagging. The value to be used for setting the water pump should be the evaporation rate multiplied by 1.2; the amount of water removed through slagging is generally 0.05 times the evaporation rate, although this figure is quite high.
If the make-up water ratio for the boiler is 20%, then for a boiler with an evaporation rate of 130 tons, the amount of make-up water required is 130*20% = 26 tons per hour
It is necessary to drain water from the boiler in order to prevent an increase in the solid content of the boiler water. In well-managed facilities, the amount of water drained from the boiler should be around 1%, meaning that for a boiler with a capacity of 100 tons per hour, the drainage volume is approximately 1 ton per hour. Apart from this drainage of boiler water, there should be no other losses; essentially, the water added to the boiler is the sum of the water drained and the water lost through evaporation.
The boiler’s rated evaporation capacity is 130 tons per hour. Under rated operating conditions, the water makeup rate is 130 tons per hour minus the steam and water losses. The amount of steam and water lost equals the amount of wastewater discharged from the boiler + various losses due to steam and water leaks + losses associated with steam usage, etc. The amount of water added back equals the amount of steam and water lost. The ratio of water added back to the rated evaporation rate gives the water makeup rate; this ratio should be less than 20%. A high water makeup rate indicates an unreasonable process, increased demand for chemical water treatment, higher costs, and is therefore not economical! :lol :lol
Due to the steam drum, the boiler water level is maintained within a normal range during actual operation. With a high salt content in the boiler water, more wastewater needs to be discharged, which increases wastewater loss and thus leads to an increase in the amount of water that must be added. Otherwise, the water level in the steam drum will drop! Conversely, when the salt content in the water is low, wastewater discharge is reduced, resulting in less loss due to wastewater discharge; as a result, the amount of water that needs to be added also decreases. Otherwise, the water level in the steam drum will rise! The consequences are serious; the leader is very angry! ! !
The make-up water rate of a boiler is the percentage of make-up water to the boiler’s evaporation volume. The water make-up rate varies depending on the purpose of the boiler; it is slightly higher for heating boilers. The normal water make-up rate for power generation units is around 2%. Corresponding make-up water level, make-up water rate * boiler evaporation rate
A 130-ton boiler refers to one that generates 130 tons of steam per hour. The water makeup volume for a boiler is equal to the sum of its evaporation rate and the amount of water removed through blowdown. The amount of water removed through blowdown is generally 0.5-1% of the evaporation rate, and this figure depends on the quality of the water. Blowdown is necessary; otherwise, it can lead to scaling in the boiler, which affects its steam production capacity and increases energy consumption.