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Technical Tips & Information
Boiler Considerations
Purchasing a boiler involves consideration of a number of issues which should be carefully considered. Lowest initial cost may in the long term be the most expensive boiler to operate. Miura is a Japanese design and North American built boiler. The boilers incorporate a number of benefits not available on other boilers.Fuel to Steam Efficiency is the measurement of input and output capabilities of the boiler and expressed as a percentage. As an example, a boiler with an input rating of 10,000,000 BTU and Output of 8,500,000 would have a fuel to steam efficiency of 85%. Most boilers operate at 78% fuel to steam efficiency. Miura boilers operate at 85% fuel to steam efficiency. This difference will result in 8% less fuel consumed per year for the high efficiency boiler and easily cover any price differences in the first two years of operation.
Air Quality is an issue which will continue to grow in importance. Miura boilers are available in two models which can be provided with NOx emissions as low as 20 ppm.
Operator costs can also impact your bottom line. All Miura boilers have a Micro computer control system which monitors all important boiler operations. Boilers are capable of coming to full operating pressure in five minutes which substantially reduces start-up time requirements in your steam system.
Turndown is the measure of the range that the boiler will operate at high efficiency. Miura boilers will operate at 85% fuel to steam efficiency from 10% of capacity to full capacity for a turn down of 10:1.
Computer control of each boiler is provided as standard equipment. The system monitors the following:
1. Steam Pressure
2. Total firing time of burners
3. Scale build-up monitor
4. Over-heat temperature
5. Flame voltage
6. Automatic surface blowdown
7. Remaining time to blow down
8. Water conductivity
9. 11 point combustion sequence monitor
10. Clogged combustion air filter
The Miura MI system provides for fully automatic control of multiple boilers to meet your load demand. A pressure transmitter reads plant steam demand which is then used by the Miura PLC to schedule the required boilers to meet the load requirements. Since each boiler has a turn down of 10:1, multiple boiler turn-down is further enhanced. As an example, a four 300 horsepower boiler installation would have a total capacity of 1,200 hp and single boiler would provide 85% fuel steam efficiency down to 30 hp with a turn down of 40:1.
Space requirements for Miura boilers are about 1/3 the footprint of comparable fire tube boilers. As an example, three 200 hp boilers with feedwater heater, water softener, and blowdown separator will fit in a 24’ x 36’ space and meet all fire code requirements. Retrofit to existing hard-to-reach small spaces is also possible since the boiler can be partially field disassembled and then reassembled to permit passage through tight areas.
Miura boilers are available in 170 and 270 psig design pressure models. Hot water boilers are also offered. Fuel options include natural gas, number 2 oil, propane, and propane air.
We can provide a complete package including boilers, feedwater equipment, water softener, and other related equipment. We can also provide a complete turnkey, single source installation of all equipment and permits. All piping and installation work is done to comply with ASME code requirements.
If a new boiler is in your plans, call us for a complete literature package on these state of the art boilers.