Medium-low temperature SCR denitrification Select a special low-temperature SCR catalyst to convert nitrogen oxides in the flue gas into harmless nitrogen and water at a temperature lower. ?
Medium-low temperature SCR denitration technologyhas significant advantages:
1. High catalyst utilization, high denitration efficiency and can maintain high efficiency at lower temperatures. temperatures Catalytic activity. When the flue gas temperature is ≥250°C, the denitrification efficiency can reach more than 91%; when the flue gas temperature is ≥320°C, the denitrification efficiency can reach more than 95%.
2. Choose high-quality SCR catalysts, which have the characteristics of good sulfur resistance, safety and environmental protection. There is no need to desulfurate first then denitrify, which avoids energy consumption caused by the drop in temperature after desulfurization and the need for heating. The catalyst does not contain vanadium pentoxide and can be recycled and reused.
3. The denitration process is energy efficient and low consumption. After low temperature flue gas denitration treatment, the waste heat can also be recycled.
The efficiency of biomass boilers is generally above 80%. The boiler model is larger, the combustion is more complete, and the boiler efficiency is higher. The highest reached 88.3%, which is 15% higher than the average efficiency level of coal boilers.
Boiler thermal efficiency refers to the percentage of effective heat in the heat supplied by the fuel. The thermal efficiency of coal-fired boilers is70 to 85% and that of oil, gas and electric boilers is 90 to 99%.
Improving the thermal efficiency of the boiler means increasing the efficient use of heat and reducing various heat losses in the boiler. Emphasis is placed on reducing boiler exhaust heat losses and mechanical losses from incomplete combustion.
Detailed information:
Efficiency calculation thermal of the boiler: < /p>
Let's take the example of a one-ton boiler. The heat production of the boiler is 600,000 kcal/h and the calorific value of natural gas is 8,600 kcal/h.
(1) 600,000 kcal/hour÷8,600 kcal/standard cubic meter÷100%≈69.76 standard cubic meters
That is, when the boiler has 100% energy conversion thermal efficiency, the burner can generate 600,000 kcal/hour of heat by burning 69.76 standard cubic meterss of natural gas, which can meet the operating needs of a one-ton boiler.
(2) 600,000 kcal/hour÷8,600 kcal/standard cubic meter÷92%≈75.83 standard cubic meters
That is to say when the boiler has an energy conversion thermal efficiency of 92%, the burner can generate 600,000 kcal/hour of heat by burning 75.83 standard cubic meters of natural gas, which can meet the operating needs of a one-ton boiler .
Baidu Encyclopedia - Thermal efficiency of boilers