A new oxygen-enriched micro-oil ignition and ultra-low load stable combustion burner

Abstract

The invention discloses a novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor. The novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor comprises an oxygen enrichment guide pipe, a primary air pipe, a cylindrical oil-coal mixed combustion chamber, a secondary air pipe, a secondary air box and a pre-combustion chamber, wherein the central axes of the primary air pipe, the cylindrical oil-coal mixed combustion chamber, the secondary air pipe, the secondary air box and the pre-combustion chamber coincide. A secondary air inlet inclining in the circumferential direction is formed in the pipe wall of the secondary air box; the primary air pipe penetrates through the secondary air box in the axial direction, the oil-coal mixed combustion chamber is coaxially arranged in the primary air pipe, and a high-energy tiny-oil ignition oil gun and the oxygen enrichment guide pipe are arranged in the oil-coal mixed combustion chamber; the secondary air pipe with a rotational flow impeller is coaxially arranged outside the primary air pipe in a sleeved mode and an outlet end is provided with a bluff body; the pre-combustion chamber is arranged in the secondary air box, the inlet end of the pre-combustion chamber is provided with a graded air duct, and a plurality of disturbance air nozzles are installed in an outlet of the combustor. The ignition fuel saving ratio reaches over 90% and the novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor has the function of low load stable combustion and the function of ultralow load stable combustion; the technologies of oxygen enrichment, coal dust concentration, graded air feeding and the like are adopted, so that the novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor has the advantages of being high in coal dust burn-off rate, low in NOx discharge and the like.

Description

technical field [0001] The invention relates to a burner, in particular to a novel oxygen-enriched micro-oil ignition and ultra-low load stable combustion burner. Background technique [0002] In 2012, my country imported about 285 million tons of crude oil, and its dependence on imported crude oil has reached 58.7%. It is generally accepted that if a country's dependence on oil imports exceeds 50%, it means that the country has entered an energy warning period. It can be seen that oil has now become a strategic material related to my country's economic security. [0003] Large-scale power plant boilers consume a lot of oil for ignition and low-load stable combustion. A 200MW boiler consumes 50-70 tons of oil at a time for raising the furnace, a 300MW boiler consumes about 80-100 tons of oil, and a 600MW boiler consumes about 200 tons of oil. - 250 tons of oil. Relevant statistical data show that my country consumes about 1.5-1.8 million tons of fuel oil each year for rai...

AI Technical Summary

Problems solved by technology

However, in the existing micro-oil ignition technology, the oxygen concentration is often low in places where the concentration of pulverized coal is high, and the ignition and combustion of pulverized coal requires sufficient oxygen supply, so the pulverized coal does not burn completely due to insufficient oxygen. The burnout rate of pulverized coal at the outlet of the burner is reduced; in addition, most micro-oil ignition technologies do not solve the problem of high nitrogen oxide emissions

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