However, because biomass contains relatively high amounts of sulfur and nitrogen, a large amount of nitrogen oxides are produced during combustion, which can have a certain impact on the environment. Therefore, whether biomass boilers need desulfurization and denitrification becomes a crucial question. Let's discuss this issue!
Based on research, testing, and analysis of biomass boiler flue gas, the following characteristics of biomass boilers have been summarized:
1. Biomass boilers are mainly divided into chain grate boilers and circulating fluidized bed boilers. The boiler types are further divided into medium-pressure boilers, sub-high-temperature and sub-high-pressure boilers, and high-temperature and high-pressure boilers. The furnace temperatures for each type are 700-760°C, 880-950°C, and 850-1100°C, respectively, showing significant differences in furnace temperature.
2. Biomass has a high hydrogen content, so the water content in the flue gas also increases accordingly, generally reaching about 15%-30%.
3. The metal content in biomass flue gas is also relatively high, generally above 8%.
4. The concentrations of sulfur dioxide and nitrogen oxides are low and fluctuate significantly. The sulfur dioxide emission standard for biomass boilers is 20 mg/Nm³, and the nitrogen oxide emission standard is 150 mg/Nm³. Emission standards vary depending on the region.
Therefore, the answer to whether biomass boilers need desulfurization and denitrification is definitely yes. So, what are the methods for desulfurization and denitrification of biomass boilers?
Biomass boilers have many types of fuel, low calorific value, and poor uniformity of feeding, resulting in drastic temperature changes in the combustion zone and large fluctuations in the initial nitrogen oxide emission concentration at the boiler outlet. Methods for biomass flue gas denitrification include: SNCR denitrification technology, SCR denitrification technology, ozone oxidation denitrification technology, ZZY denitrification technology, etc.
However, because biomass contains relatively high amounts of sulfur and nitrogen, a large amount of nitrogen oxides are produced during combustion, which can have a certain impact on the environment. Therefore, whether biomass boilers need desulfurization and denitrification becomes a crucial question. Let's discuss this issue!
Based on research, testing, and analysis of biomass boiler flue gas, the following characteristics of biomass boilers have been summarized:
1. Biomass boilers are mainly divided into chain grate boilers and circulating fluidized bed boilers. The boiler types are further divided into medium-pressure boilers, sub-high-temperature and sub-high-pressure boilers, and high-temperature and high-pressure boilers. The furnace temperatures for each type are 700-760°C, 880-950°C, and 850-1100°C, respectively, showing significant differences in furnace temperature.
2. Biomass has a high hydrogen content, so the water content in the flue gas also increases accordingly, generally reaching about 15%-30%.
3. The metal content in biomass flue gas is also relatively high, generally above 8%.
4. The concentrations of sulfur dioxide and nitrogen oxides are low and fluctuate significantly. The sulfur dioxide emission standard for biomass boilers is 20 mg/Nm³, and the nitrogen oxide emission standard is 150 mg/Nm³. Emission standards vary depending on the region.
Therefore, the answer to whether biomass boilers need desulfurization and denitrification is definitely yes. So, what are the methods for desulfurization and denitrification of biomass boilers?
Biomass boilers have many types of fuel, low calorific value, and poor uniformity of feeding, resulting in drastic temperature changes in the combustion zone and large fluctuations in the initial nitrogen oxide emission concentration at the boiler outlet. Methods for biomass flue gas denitrification include: SNCR denitrification technology, SCR denitrification technology, ozone oxidation denitrification technology, ZZY denitrification technology, etc.