Writer： admin Time：2021-04-20 00:00 Browse：℃
Natural gas is a clean energy, not only can improve the production site working environment, but also can significantly reduce emissions of air pollutants, gas burners are also using more burners, with the view of low nitrogen burner works
Low nitrogen burner works
Low NOx burners and low NOx burners, refers to fuel combustion during low NOx emissions burner with low NOx burners to reduce emissions of nitrogen oxides during combustion. Nitrogen oxides produced in the combustion process mainly NO and NO2, generally these two oxides of nitrogen known as nitrogen oxides NOx. Experimental results show that the nitrogen oxide emissions of the main combustion apparatus is NO, on average about 95%, while only about 5% NO2. Usually NO fuel combustion generated mainly from two aspects: First, the combustion air (combustion air) oxidation of nitrogen; the second is contained in the fuel during combustion nitride thermal decomposition reoxidation. In most combustion apparatus, the former is the main source of NO, NO will be such as "thermal reaction NO", which is called "fuel NO", in addition to "prompt NO." The formation of NO can react with a nitrogen atom of the NO to NO2 intermediate is reduced during combustion. In fact, in addition to these reactions, NO and NO2 can also generate a variety of nitrogen-containing compound. In the actual device, the combustion reaction reaches chemical equilibrium, [NO2] / [NO] ratio is small, i.e., less NO to NO2 conversion can be ignored. Reducing NOx combustion technology of NOx generated by the combustion, the combustion method and the combustion conditions have great influence on the generation of NOx, NOx can thus be reduced by improved combustion technology that through: the use of lower N content fuels, including fuel into the denitrification and low nitrogen fuel; lower excess air ratio, tissue rich combustion to reduce the concentration of oxygen around the fuel; in a low excess air, the peak temperature is lowered to reduce the "thermal reaction NO"; oxygen where lower concentrations, increases the residence time of fuel in the flame front and reaction zone. Specific method of reducing the formation of NOx emissions and for a normal operation: staged combustion, reburning process, oxygen combustion, flue gas recirculation and combustion shade variations and the like. Commonly used low NOx burners Introduction burner apparatus is an important industrial furnace, which ensures complete combustion of the fuel-ignition combustion stability and fuel process and the like, therefore, to suppress the amount of NOx we must start from the burner. The NOx reduction combustion technology, low-NOx burners are roughly classified into the following categories: 1. Low NOx burner precombustor precombustion chamber is nearly 10 years of research to develop a high efficiency of low NOx staged combustion technique, the precombustion chamber generally by the primary air (or secondary air) and a fuel injection system components, fuel primary air and rapid mixing to form a fuel-rich mixture in the primary combustion zone precombustion chamber, due to hypoxia, only part of the fuel is combusted, oxygen-depleted fuel, and a lower flame temperature to precipitate a volatile flame area, thereby reducing the NOx generation. 2. Stage burner design according to the principles of the staged combustion stage of the combustor, the fuel and air mixture combustion staging, since the deviation from the theoretical equivalence ratio of the combustion, and thereby reduces the generation of NOx. 3. Recirculation burner itself is the use of combustion air head, the part of the combustion fumes sucked back into the burner, and combustion air mixture. Since the flue gas recirculation, the combustion fumes a large heat capacity, the combustion temperature is lowered, the NOx reduction. Another recirculation burner itself is directly recycled into the part of the fumes inside the burner and to the combustion process, the burner has such a suppression effect of nitric oxide and the double energy. 4. Bias burner principle is as a part of the fuel rich combustion, the other portion of the fuel combustion as too light, but on the whole amount of air remains constant. Since the two parts are offset from the stoichiometric ratio of combustion, and thus NOx is very low, yet departing from such combustion or stoichiometric combustion burner. 5. Split flame burner principle is the small number of a flame into a flame, a flame due to the small heat dissipation area, a lower flame temperature, so that the "thermal reaction NO" decreased. In addition, a small flame is shortened residence time, oxygen, nitrogen and other gases in the flame, "heat the reaction NO" and "Fuel NO" are significantly inhibited. 6. Mixing promotion burner flue gas residence time in the high temperature region is one of the main factors affecting the amount of NOx generated, to improve the mixing with the combustion air, the flame thickness can be made thinner surface, in the case where the combustion load unchanged, smoke i.e., the surface temperature in the flame zone residence time is shortened, thus the amount of NOx generated is reduced. Mixing promotion burner is in accordance with this principle.
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