Boiler efficiency
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May I ask: Which type of boiler has a higher efficiency? What is the efficiency level of steam boilers, and what about heat transfer oil boilers? Comparatively, which is more efficient, a steam boiler or a heat transfer oil boiler?
Generally, boilers with a low air leakage coefficient are more efficient. For example, the WNS-type fuel-gas boiler has an efficiency of over 90%. Condensing boilers have a higher efficiency (on a lower heating value basis), which can exceed 100%, while electric heating boilers have an efficiency of over 98%. Oil and gas furnaces generally have higher efficiency than coal-fired furnaces. In coal-fired boilers, power station boilers (typically boiling boilers and fluidized bed boilers) are more efficient than industrial boilers; their combustion efficiency can reach 99%, while the boiler efficiency is generally above 85%. Industrial boilers have low efficiency, generally below 80%
What kind of boiler is a condensing boiler? I’ve never heard of it, haha. Also, power station boilers include boiling boilers and fluidized bed boilers; so what kind of boilers are industrial boilers?
Working principle of condensing boilers: The flue gas temperature is one of the basic parameters of a boiler. Choosing a lower flue gas temperature can reduce the flue gas losses of the boiler, thereby improving its thermal efficiency. If the flue gas temperature of the boiler is reduced to a low enough level, the superheated water vapor in the flue gases will condense, releasing the latent heat of vaporization. A condensing boiler utilizes an efficient flue gas condensation waste heat recovery device to capture the sensible heat in the exhaust gases exiting the boiler, as well as the latent heat released during the condensation of water vapor, thereby improving the thermal efficiency of the boiler. When a conventional boiler without a condensation recovery device burns natural gas, and its thermal efficiency is 90% based on the lower heating value of the fuel, the exhaust gas temperature drops to 30–50°C when a condensing waste heat recovery device is used, resulting in a thermal efficiency that rises to around 107%. Industrial boilers refer to boilers that generate high-temperature heat carriers (steam, hot water, and organic heat carriers) for use in industrial production processes, such as in brewing, papermaking, textiles, the wood industry, food processing, and the chemical industry. Industrial boilers generally have P≤2.5MPa and D≤65t/h
Thank you to all the seniors for your guidance; I’ve learned a lot
The average efficiency of gas boilers is generally above 90%, which is 10%~20% higher than that of conventional large coal-fired boilers, and 30%~40% higher than that of some small, decentralized coal-fired boilers.