 |
 Improvement of response to load change |
| Blue-i SYSTEM through a combination of a proportionally controlled middle combustion range (40% to 80%) and fixed high combustion (100%) and low combustion (20%), achieves both prevention of steam pressure change and smooth response to sudden load change.
It performs proportional control in the middle combustion range, and when sudden load change occurs, instantly switches over to either high or low combustion, thus enabling load
response. |
 |
| Effective utilization of the high-efficiency zone |
The characteristics of the boiler mean that it has maximum efficiency at intermediate load as opposed to full load. The boiler efficiency in the case of conventional multi-stage combustion
ran across a fixed straight line connecting two loads, however with Blue-i SYSTEM, the
efficiency at 40 to 80% load shifts as a curve, therefore efficiency is expressed as a
mountain- shaped curve. As such, it is possible to effectively use the high efficiency zone.
For example, in the case of 75% fixed load, the conventional multi-stage control boiler would
repeat high combustion (100%) and medium combustion (50%), and the average boiler efficiency would be the 75% load value on the straight line connecting the high combustion
and medium combustion. With Blue-i SYSTEM, continuous operation at 75% load is possible,
and the load value is on a mountain-shaped curve, therefore enabling operation at an
even higher efficiency than the average efficiency based on a straight line. |
 |
| High quality steam across all load ranges |
| A new water level control system suiting proportional control in the middle combustion
range enables high steam dryness to be maintained across all load ranges. |
| Reduction of steaming-up time |
| Starting and warming up from a cold stopped state is performed in the middle
combustion range (40%), thereby reducing steaming-up time. |
| High-efficiency through latent heat recovery |
| Latent heat is recovered in the low load range to improve efficiency even further. |
| |
| Power-saveing benefits |
In the case of conventional multi-stage
combustion, the shift to the operating frequency of the fan inverter set for each fixed load was repeated therefore power consumption was the average of the
power at each frequency, moreover
braking loss would also occur when there
was a reduction in load. |
With Blue-i SYSTEM, proportional
control is performed at between 40 and
80% of the load range, so the power
consumption of the fan accompanying
load change is practically a value
responding to the operating frequency,
and braking loss also becomes minimum,
therefore it is possible to reduce power
consumption |
|
 |
|
| Middle combustion priority with Multi-boiler control system |
| Multi-boiler control system enabling efficient load response in the case
of multiple once through boiler systems. By combining this system and a boiler equipped with Blue-i SYSTEM, it is possible
to create a boiler system with the highest efficiency and lowest power consumption. |
 |
