How to reduce the gas consumption when using a 10t low-pressure natural gas steam boiler to increase the inlet water temperature
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For a 10t low-pressure natural gas steam boiler that raises the inlet water temperature, how can the amount of gas used be reduced? Currently, a heat storage boiler is used to raise the inlet water temperature to over 85 degrees; the problem now is that the exhaust gas temperature reaches 220 degrees. Since the boiler has a heat recovery system, how can this be adjusted? ?
It shouldn’t be! Combustion is adjusted based on the outlet water temperature. The exhaust temperature is high; firstly, the target value set by the controller is too high, which increases the outlet water temperature and consequently leads to a higher exhaust temperature. II. Regarding the boiler issues: the heat exchange area is small and the flow rate is high, leaving insufficient time for adequate heat exchange, which results in the flue gas escaping.
The smoke exhaust temperature is too high. Is it still like this? How long has it been in use? Is the scaling too severe?
If the inlet water temperature rises, then the exhaust gas temperature will also increase. Unless there is also an air preheater, the water generally enters at the very end of the boiler – as the water temperature rises, the temperature difference for heat exchange decreases, the heat transfer coefficient drops, and the flue gas temperature rises. To reduce the flue gas temperature, an additional heat exchange unit with a lower medium temperature must be added after the water inlet.
The main goal is to increase the inlet water temperature in order to reduce gas consumption, but this approach does not result in any energy-saving effects; the thermal efficiency does not improve.
An air preheater can be added behind the economizer to increase the temperature of the hot air, but I’m not sure whether this would pose a risk of explosion in gas boilers. Or, cold water with an even lower temperature can be added behind the economizer for other purposes.
Gas consumption will definitely decrease, and at the same time, the thermal efficiency will also drop. Fairly. Going from 98 degrees to 99 degrees definitely uses less gas than going from 0 to 99 degrees, but it still uses more gas than going from 0 degrees to 1 degree.
No, here our gas boiler has an air preheater right behind the economizer
Just add another stage of economizer in series.