The in-house principle when low nitrogen burner is run

     Low nitrogen burner reachs burner of low nitrogen oxide, it is the burner with small discharge capacity of the nitrogen in pointing to fuel combustion process, choose low nitrogen burner to be able to drop of oxide of the nitrogen in combustion process discharge.

The oxide of the nitrogen that produces in combustion process is principal for NO and NO2, connect the oxide of these two kinds of nitrogen normally call the oxide that it is nitrogen nitrogen. Much test result makes clear, the azotic oxide that combustion facilities discharges is principal for NO, occupy on average about 95% , and NO2 is occupied only 5% the left and right sides.

The NO that place of general fuel combustion generates is principal come from two respects: It is combustion place uses air (combustion air) in azotic oxidation; 2 it is the place in fuel contain nitride to oxidize again in the pyrolysis in combustion process. In most combustion facilities, former the principal source that is NO, we call this kind of NO " hot resonant NO " , latter says for " fuel NO " , other still have " twinkling sends NO " .

It is OK that the place when combustion forms NO with the atom that contain nitrogen semifinished product echo makes NO reductive into NO2. On practice besides these echo, NO is OK still with all sorts of containing nitrification content generates NO2. In carrying out combustion facilities echo achieves chemical balance when, [NO2]/[NO] proportion is very small, namely NO change is NO2 very few, OK and unwary.

Drop combustion mastery of a skill or technique of nitrogen

Nitrogen happens by combustion, and combustion method and combustion condition are right of nitrogen generate have bigger effect, can drop consequently through improving combustion technical ability nitrogen, its are principal the approach is as follows:

Choose the fuel with N inferior content, include fuel to take off nitrogen and change to become low nitrogen fuel;

Drop air is superfluous coefficient, had arranged thick combustion, will drop all round fuel the chroma of oxygen;

In excess air little state of affairs falls, degree of peak value drops in temperature below in order to cut down " hot resonant NO " ;

In oxygen chroma inferior circumstance falls, the time that increases combustible to stay in the peak before blaze and resonant area.  Cut down nitrogen form and discharge the specific method that uses normally to be: Classification combustion, recrudescent burn combustion of law, low oxygen, shade error combustion and flue gas recycle to wait.

General and commonly used brief introduction of burner of low nitrogen oxide

Burner is the important equipment of industrial furnace, it ensures fuel stability catchs fire the process such as the complete combustion of combustion and fuel, consequently, should restrain of nitrogen generate a quantity to must do it from burner. The basis drops combustion mastery of a skill or technique of nitrogen, burner of low nitrogen oxide divides roughly it is the following kinds:

1. Level burner

The basis classifications the level burner that combustion principle plans, make fuel and air section mix combustion, because combustion violated theoretical equivalent to compare, can drop so of nitrogen generate.

2. Oneself recycle burner

One kind is the pressure head of use combustion air, absorb partial combustion flue gas, enter burner, mix combustion with air. Because of flue gas recycle, the thermal capacity of combustion flue gas is large, combustion temperature drops, nitrogen is cut down.

Burner of recycle of another kind of oneself is a partial flue gas enter recycle inside burner directly, join combustion process, this kind of burner has restrain oxidation nitrogen and energy-saving and double effect.

3. Shade burner

Its principle is to make one part fuel has made thick combustion, another part fuel has made weak combustion, but empty tolerance holds to on collectivity changeless. Because two parts are in,violate chemical equivalent to compare next combustion, nitrogen is very consequently low, this kind of combustion is called again violate combustion or be not chemical equivalent combustion.

4. Break up blaze burner

Its principle is divide a blaze into several small blaze, because small blaze comes loose hot area is large, blaze temperature is inferior, make " hot resonant NO " drop somewhat. In addition, blaze is small shortened the gas such as oxygen, nitrogen the retention period in blaze, right " hot resonant NO " and " fuel NO " the restraining that Dou Youming shows action.

5. Mix promote model burner

Flue gas is in high temperature area retention period is one of chief factors that affect nitrogen to make an amount, improve combustion and airy to mix, can make the ply of blaze face is decreased thin, in combustion bear changeless circumstance falls, flue gas is in blaze face namely the retention period inside high temperature area shortens, make consequently of nitrogen generate a quantity to drop. Mix promote model burner plans according to this kind of principle namely.

6. Burner of low nitrogen precombustion chamber

Precombustion chamber is a kind of when come to our country nearly 10 years develop research efficient, low nitrogen classifications combustion mastery of a skill or technique, precombustion chamber is general by wind (or 2 wind) erupt with fuel the composition such as the system, fuel and wind mix quickly, inside precombustion chamber primary combustion area makes rich fuel compound, because anoxic, it is partial fuel undertakes burning only, fuel is mixed in deficient oxygen the cent inside the blaze area with blaze inferior temperature goes out volatilize cent, cut down nitrogen consequently generate.