Burning system of heavy oil boiler and method thereof

Abstract

The invention discloses a burning system of a heavy oil boiler and a method thereof. The burning system comprises an air inlet pipe, an air fan, more than one air box placed on the outer side of a hearth, burnout air spouts formed in each air box, a plurality of burners and igniters, wherein each burner comprises an atomized oil gun, a primary air pipe and a secondary air pipe which are arranged in a sleeving way from interior to exterior, the atomized oil gun comprises an oil pipe and a nozzle which are connected, and the front end of the primary air pipe is provided with a combustion stabilizer; the secondary air pipe is internally provided with a rotational flow device, the front end surface of the nozzle is concentricalally provided with two circles of nozzle holes, each circle of nozzle holes comprises a plurality of nozzle holes which are formed in an equidistant manner, the two circles of nozzle holes are formed in the periphery at intervals, and the hole diameters and spray angles of the outer circle of nozzle holes are larger than those of the inner circle of nozzle holes; and an economizer outlet of the boiler is also connected with an air inlet pipe through a flue gas recirculation pipe, and the flue gas recirculation pipe is provided with a circulating fan. As the burning system and the method are used, the generation amount of nitrogen oxide is greatly reduced, more and more environmental requirements are met, and the burning system of the heavy oil boiler and the method thereof respectively have a relatively wide market prospect.

Description

Technical field [0001] The invention relates to a combustion system and method for a heavy oil boiler. Background technique [0002] Heavy oil is a kind of liquid fossil fuel. Compared with conventional pulverized coal, it has a higher net calorific value. Compared with gas fuels such as natural gas, the system is simpler, safer, easier to store, and not subject to geographical restrictions. Compared with light oil, The difference in production process is more economical and cheaper. In recent years, as the prices of high-quality fuel oil and natural gas continue to rise, heavy oil has received more and more attention as an alternative power fuel in oil-producing countries such as the Middle East. In countries with large reserves of heavy oil, such as the Middle East, boilers using heavy oil as the main fuel are the first choice for new power plants. Therefore, oil-fired units still have a considerable market in some oil-producing countries. [0003] At present, power station ...

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Problems solved by technology

[0003] At present, power plant boilers mainly use heavy oil or residual oil in petroleum products, which is the residue left after crude oil is heated and refined to fractionate gasoline, kerosene and diesel oil. Its ignition and burnout characteristics are easier than coal powder, but Existing heavy oil boilers tend to produce high nitrogen oxides (NOx) and other pollutants during combustion, and the emissions of nitrogen oxides often reach 800mg / Nm 3 , because in the combustion process of fuel, the generation of nitrogen oxides is part of the combustion reaction, and the nitrogen oxides generated by combustion are mainly NO and NO2, collectively referred to as NOx

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