Exceed low nitrogen burner to transform program

Technology of low nitrogen combustion

One, air classifications combustion

Air classifications combustion technology is now domestic and international * uses generallyLow NOx burnsOne of technologies.

1. The air that fundamental wants fuel combustion place shares out bonus two class or more class send the chamber of a stove or furnace, make the combustion process of coal is in hold end of the grading on the foundation with all excessive air changeless coefficient:

1) fuel of first-order Duan Weifu burns, make α ＜ 1, the 70 ～ of the total empty tolerance that wants combustion place 80 from advocate combustion area sends, in order to make sure fuel burns below anoxic condition, compose is built restore sexual atmosphere, restrain of fuel NOx generate;

2) the 2nd phase burns for oxygen boosting, will odd air (light wind) from advocate of combustion division upper part light an area to send the chamber of a stove or furnace, of be over coal fines light a course. Although light area air the capacity is much, can generate one part NOx again, but collectivity comes,telling the NOx inside furnace to make an amount is reductive.

2. Influence air classifications combustion drops the element of NOx effect:

1) coefficient of air of excessive of two class flaming allocates;

2) combustion temperature;

3) retention period;

※ air classifications combustion should avoid rich fuel the knot broken bits inside combustion area and corrode

2, flue gas recycle

1. Principle: From air intake air heater hind draw-out the flue gas after one part burns supplies heat directly inside, heat is supplied again after in sending bellows first probably, mixing with sirocco inside, the chroma of combustion temperature and oxygen falls under, drop thereby NOx generates quantity;

Flue gas recycle leads = (recycle smoke tolerance) / (tolerance of the smoke when having recycle) × 100

2. Flue gas recycle the law drops the effect of NOx and fuel sort and recycle rate are concerned, the fall of NOx is led be added along with what recycle leads and add.

3. 15 ～ are in recycle rate 25 when, the NOx of coal fines furnace discharges chroma to be able to drop ～ 25.

4. General recycle is led choose in 10 ～ 20 the left and right sides;

5. Combustion temperature is higher (like furnace of liquid state cuttings pick-up) recycle rate is affected to the fall of NOx bigger;

※ chooses flue gas recycle to want to add outfit recycle fan, flue, increased contributive, the system is more mixed and disorderly also, need to undertake technical economy compares resolution.

Machine of low nitrogen combustion causes air pressure switch response is not sensitive

The method that the pulverization degree of the soot after heavy oil burns reduces

Exceed low nitrogen burner to transform program

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