Boiler feedwater issues
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Can the feed water for the boiler flow directly from the economizer, without going into the drum, and mix with the circulating water coming from the downcomer before entering the evaporation section?
No, for the following reasons: 1. Adding water directly to the downcomer will disrupt the internal circulation of the boiler water. 2. In the downcomers that are farther from the economizer outlet, a purely gaseous state of the working fluid may occur, while in those downcomers that are closer to the economizer outlet, a purely liquid state of the working fluid may exist. 3. The water level in the boiler drum is inaccurate, and it is very likely to fluctuate sharply. 4. Unbalanced combustion in the furnace. The flow direction of the smoke gas is unstable. 5. The fire bed may experience deviation, flame jumping, and incomplete combustion of the fuel. Just my humble opinion; let’s discuss it together.
I think it’s not possible either. 1. It will disrupt the internal circulation of the boiler water. 2. From the perspective of the boiler’s layout, the downcomers extend from the drum; therefore, the feedwater must enter the drum before it can reach the downcomers
I don’t think it’s possible; since it’s not specified in the operating procedures, we shouldn’t make changes casually, to avoid unnecessary problems or even accidents.
Hehe, I have little experience with industrial boilers, but such things are not allowed in power station boilers. Following the soda water flow path: water from the feed pump – economizer – steam drum – water wall tubes – steam drum separator – superheater – turbine. The drum serves to collect and distribute the steam-water mixture; if steam enters the downcomer directly from the economizer, it will inevitably affect the water circulation and also impact the regulation of water supply to the boiler. Additionally, the drum also serves to equalize and stabilize pressure; when feed water supply is stopped, it allows water to flow into the economizer through the recirculation circuit, thereby preventing the economizer from overheating and being damaged due to a lack of water.
No, it mainly disrupts the water circulation in the boiler. Since ordinary boilers operate on a natural circulation principle, if this circulation is disrupted, the boiler cannot function safely.
Disrupts the internal circulation of the boiler water. It affects the lifespan of the water wall.
Some hot water boilers introduce return water at the lower header or downcomer; they use this return water to create an induced circulation of water, thereby increasing the circulation ratio, and are considered semi-forced natural circulation hot water boilers.
. That’s not allowed. The drum serves to collect and distribute the steam-water mixture; if steam enters the downcomer directly from the economizer, it will inevitably affect the water circulation and also impact the regulation of water supply to the boiler. Additionally, the drum also serves to equalize and stabilize pressure; when feedwater supply is stopped, water can be supplied to the economizer through the recirculation circuit, thereby preventing the economizer from overheating and getting damaged due to a lack of water
What are the main adverse effects on the water cycle?
No, this will disrupt the normal water circulation and lead to accidents in the water wall. For example, in the startup protection measures for the economizer, it is specified that the recirculation valve must be closed first before water can be fed into the boiler, in order to prevent water from entering the downcomer directly
No, it not only affects the water cycle but can also lead to safety accidents in severe cases