How does burner of low nitrogen of gas fired boiler choose

Beijing applied on April 1, 2017 boiler nitrogen oxide of Yan Ke discharges a standard formally, the boiler NOx that the requirement builds is discharged under 30 milligram, the boiler NOx that using is discharged under 80 milligram. Use owner of gas fired boiler to be in for the most part on the market at present for, mean must change low nitrogen burner, ability is contented discharge a requirement.

Burner of traditional natural gas boiler normally NOx is discharged control in 120~150 milligram; Low nitrogen burner is to show NOx discharges the burner in 30-80 milligram normally; NOx is discharged in 30 milligram the following call normally exceed low nitrogen burner;

The tall NOx of traditional burner discharges basically result from:

1, to make sure combustion is sufficient, used bigger excessive air;

2, combustion temperature is controlled in 1800 degrees normally.

Low nitrogen burner is based on following technology normally:

1. Electronic scale adjusts and oxygen content controls a technology; Will control oxygen content accurately;

Technology of recycle of 2.FGR flue gas, will reduce blaze temperature and oxygen content;

3. The exterior combustion technology that mixes beforehand completely will reduce blaze temperature and implementation to burn adequately;

At present home is used is exterior combustion + FGR exceeded low nitrogen burner to combine exterior flaming NOx to command advantage and advantage of FGR deoxydization content, can come true to control NOx to arrive in complete fire limits so 20 milligram level, at the same time control oxygen content is in 3% less than, change combustion efficiency greatly. Its are main demerit is facility cost rises.

Low nitrogen burner chooses the main parameter of the consideration:

1, NOx is discharged

The environmental protection that must satisfy a place discharges a requirement, below the premise of contented requirement, set out from the social responsibility angle of the enterprise, should choose NOx to arrange smaller facility as far as possible;

2, end oxygen content

It is to achieve coefficient of excess air of sufficient flaming limit about 1.1, content of corresponding academic end oxygen is about 2% . Higher end oxygen content means burner efficiency normally reduce. Content of ideal burner end oxygen can be controlled in 3% less than; The end oxygen content of burner of flaming of the surface on the market is in normally 7% the left and right sides, opposite at the end oxygen content of 3% , mean the quantity of heat with identical generation, need is expended more about the natural gas of 6~8% . To run all the year round or equipment is in for a long time relatively high load capacity runs, natural gas wastage compares big owner, choose the burner with low content of an end oxygen crucial to reducing moving cost.

3, adjustable than

The low nitrogen burner that used electronic scale to adjust should have normally at least 5: Tone compares the Gao Ke of １ above. Lower adjustable more ON/Off in running a course more actually than meaning are opened stop, also mean more natural gas to use up at the same time. Unless be the boiler that bear compares small stable interval in all the year round, the burner that chooses attune of a Gao Ke to compare to lowering natural gas use up, reduce moving cost, the service life that prolongs equipment is very important.

Other basically considers a factor

Combustion stability is the main consideration element that chooses low nitrogen burner, include the dependability of equipment itself. From the angle consideration of combustion stability, to using the low nitrogen burner of FGR technology, need pays close attention to scale of recycle of FGR flue gas particularly, too large proportion means combustion to be not stabilized extremely easily, perhaps have more slashing demand to the technology of equipment and control level.