What pollutants do biomass boilers produce? How does it need to be governed?

Release time:

2022-12-13

iomass boiler is a boiler fueled by biomass energy. The boiler will produce certain pollutants in the combustion process. In the combustion process of fuel, the biomass boiler will produce sulfur in the combustion process, but it will produce nitrogen oxides. Biomass boiler combustion, mostly using herbs, such as: Straw, bark, peanut shell, rice bran, wood chips, etc. as fuel, biomass fuel is a renewable clean fuel, can replace oil, coal and other traditional energy, in order to reduce the consumption of fossil fuels, reduce carbon monoxide emissions (CO), can not only protect the environment, but also promote the effective use of resources, sustainable development of agriculture and forestry, It has good ecological and social benefits.

How to effectively control the pollutants produced by biomass boilers?

There are two denitrification methods of biomass boiler: denitrification in the furnace and denitrification outside the furnace.

1. Selective catalytic reduction denitrification technology (SCR) : It is a kind of boiler body without any modification, using NH3 or urea as reducing agent, under the action of metal catalysis, selectively react with NOx to generate N2 and H2O, without being oxidized by O2 first. SCR denitrification technology is currently the most effective denitrification efficiency of the treatment technology, denitrification rate can reach more than 95%, biomass fuel itself contains alkaline substances, after combustion to form fly ash into the SCR system, adsorption on the surface of the catalyst or blockage of the catalyst channel, will also cause catalyst inactivation. In order to ensure the safe operation of the catalyst, it is necessary to minimize the flue gas drag.

2. Selective non-catalytic reduction technology (SNCR) : with the furnace as the reactor, 30%~50% NOx removal efficiency can be generally obtained. The reducing agent is generally ammonia, water and urea, but ammonia belongs to dangerous chemicals, and urea is generally used as the reducing agent. SNCR technology is one of the main technologies of flue gas denitrification, denitrification cost is low, the process is simple, but it is difficult to achieve higher denitrification efficiency.

Enterprises can combine their own field conditions to choose the right denitration scheme, Green Valley to provide you with more denitration cases for reference.

News center