By EBICO 2020-03-18 15:13:16
Low NOx burner and low NOx burner, refers to the gasoline combustion manner of low NOx emissions of the burner, the use of low NOx burner can minimize the combustion system of NOx emissions.
The oxides of nitrogen produced in the combustion system are primarily NO and NO2, which are many times referred to as NOx.A giant range of experimental outcomes exhibit that the nox emitted by using combustion gadgets is primarily NO, accounting for about 95% on average, whilst NO2 solely bills for about 5%.
The NO generated through commonplace gasoline combustion often comes from two aspects: one is the oxidation of nitrogen in the air used for combustion (combustion air);Second, the nitride contained in the gas in the combustion procedure of thermal decomposition reoxidation.In most combustion devices, the former is the foremost supply of NO, which is referred to as "thermal response NO", which is referred to as "fuel NO", and "instantaneous NO".
The formation of NO in the course of combustion can react with nitrogen atom intermediates to limit NO to NO2.In fact, in addition to these reactions, NO can mix with more than a few nitrogenous compounds to shape NO2.When the response reaches chemical equilibrium in the authentic combustion device, the ratio of [NO2]/[NO] is very small, that is, the conversion of NO to NO2 is very small, which can be ignored.
NOx discount combustion technology
NOx is generated by means of combustion, and combustion techniques and combustion stipulations have a remarkable have an effect on on the manufacturing of NOx, so NOx can be decreased via enhancing combustion technology, the principal way is as follows:
Choose gas with low N content, consisting of denitrification of gas and conversion to low nitrogen fuel;
Reduce the extra coefficient of air, prepare the over-dense combustion, to minimize the oxygen awareness round the fuel;
In the case of much less surplus air, decrease the height temperature to limit the "thermal response NO";
In the case of low oxygen concentration, extend the time of combustion in the the front height and response zone.
The particular strategies many times used to decrease the formation and emission of NOx are: fractional combustion, recombustion, low oxygen combustion, bias combustion and flue fuel recycling.
Low nox burners are many times used
Burner is an essential tools of industrial furnace, it ensures gasoline secure ignition combustion and gasoline whole combustion process, therefore, in order to inhibit the manufacturing of NOx should begin from the burner.According to NOx discount combustion technology, low NOx burner can be roughly divided into the following categories:
1.Stage burner
The stage burner is designed in accordance to the principle of fractional combustion, so that the gas and air can be combined in special sections, due to the fact the combustion deviates from the theoretical equal ratio, the technology of NOx can be reduced.
2.Self recirculating burner
One is the use of combustion air stress head, phase of the smoke lower back into the burner, blended with air combustion.Due to flue fuel recycling, the warmness ability of combustion flue fuel is large, the combustion temperature is reduced, and NOx is reduced.
Another variety of self-recirculating burner is to put phase of the flue gasoline without delay into the recirculation in the burner and add the combustion process.
3.Thick-light burner
The precept is that one section of the gas is overburned and the other section is underburned, however the ordinary air quantity stays the same.Because each components are in the deviation from the chemical equal ratio combustion, and consequently NOx is very low, this combustion is additionally known as deviation combustion or non-chemical equal combustion.
4.Split flame burner
The precept is to divide a flame into quite a few small flames. Due to the massive warmness dissipation vicinity of the small flame and the low temperature of the flame, the "thermal response NO" decreases.In addition, flame reduces the dwelling time of oxygen, nitrogen and different gases in the flame, and it has apparent inhibitory impact on "thermal response NO" and "fuel NO".
5.Hybrid accelerator burner
The house time of flue fuel in the excessive temperature location is one of the most important elements affecting the manufacturing of NOx. Improving the mixing of combustion and air can decrease the thickness of the flame surface. Under the situation that the combustion load stays unchanged, the dwelling time of flue fuel in the flame floor is shortened in the excessive temperature area, for that reason decreasing the manufacturing of NOx.The hybrid accelerator burner is designed in this way.
6.Low NOx chamber burner
Precombustion chamber improvement lookup in China in latest 10 years is a variety of excessive effectivity and grade of low NOx combustion technology, commonly speaking, a precombustion chamber of the wind or secondary air and gas injection system, etc, the combined gas and a wind, in a shape in the combustion quarter precombustion indoor gasoline mixture, due to the lack of oxygen, is solely section of the gasoline combustion, gasoline in bad oxygen and low flame temperature of a flame unstable precipitation in the area, thereby decreasing NOx formation.