Variable-pressure and variable-working-condition oil burning nozzle

Abstract

The invention provides a variable-pressure and variable-working-condition oil burning nozzle. The variable-pressure and variable-working-condition oil burning nozzle is a technical burning nozzle which is adapt to high-pressure environments, applicable to coal gasifiers, provided with igniting and burning capabilities in an operation process with random fixed pressure, variable pressure and continuous variable working conditions in a pressure range of 0-2.0MPaG, and used for igniting the coal gasifiers. The burning nozzle comprises body sleeves and a premix jet flow head. The body sleeves are in coaxial arrangement and include a liquid fuel outer sleeve, an atomizing agent outer sleeve and an oxidizing agent outer sleeve sequentially from inside to outside, and an annular space between each two sleeves form a medium passage. The premix jet flow head comprises inner and outer contraction type sonic or subsonic nozzles and two-level atomizing and mixing chambers and capable of realizing efficient atomizing and mixing of fuels and oxidizing agents and stable ignition and combustion. A double-layer closed annular passage cooling structure is arranged on the outermost layers of the head and the body of the burning nozzle, the burning nozzle is hermetically connected with a coal gasifier body through a mounting flange, and tightness and ablation avoidance of the burning nozzle under the furnace pressure of 0-8MPaG and at the furnace temperature of 1200-1700DEG C can be guaranteed.

Description

technical field [0001] The invention relates to an oil burner, in particular to a new type of start-up burner which is used in a gasification furnace and can adapt to variable pressure and variable working conditions in a high-pressure environment. Background technique [0002] Efficient and clean coal gasification technology is the mainstream of coal gasification technology development in my country today. The industrialized coal gasification technology mainly includes pulverized coal pressurization and coal-water slurry gasification. [0003] The gasifier is the key equipment for coal-water slurry gasification and pulverized coal pressurized gasification technology, and the start-up process of the gasifier is usually completed by the start-up burner. [0004] When the coal-water slurry gasifier is started, the start-up burner is under the condition of slight negative pressure and normal pressure. When the temperature in the furnace reaches the feeding temperature, the star...

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Problems solved by technology

[0004] When the coal-water slurry gasifier is started, the start-up burner is under the condition of slight negative pressure and normal pressure. When the temperature in the furnace reaches the feeding temperature, the start-up burner is removed, and the refractory brick and the start-up burner blind flange are installed at the same time. The gasifier can only be fed and started, and the ignition method is manual ignition. Therefore, the entire start-up and ignition process is cumbersome to operate, low in automation, easy to turn off and difficult to detect, labor-intensive for workers, and poor safety for on-site operators

[0005] When the pulverized coal pressurized gasifier is started, the start-up burner can realize variable pressure and variable working condition load adjustment within a certain pressure range, but the pressure range is usually not higher than 1.0MPa, and the corresponding industrialized pulverized coal pressurized gasifier The furnace pressure is usually not higher than 4.0MPa, which seriously restricts the development of more energy-saving, more environmentally friendly large-scale, high-pressure coal gasification technology

[0006] In addition, when the start-up burner of the pulverized coal pressurized gasifier is in the process of variable pressure and variable working conditions, after the shutdown is caused by unexpected circumstances, the furnace pressure needs to be reduced to normal pressure again to restart the ignition and changeover of the start-up burner. High pressure and variable working conditions, resulting in a long time to deal with the entire flameout accident

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