Coal-water fluid gasifying spray nozzle

Abstract

The present invention relates to a combustion device, and is aimed at providing a coal-water slurry gasification nozzle. It is characterized by forming central tube oxidant channel whose section is concentric ring-tubular structure, medium ring coal-water slurry channel and outer ring oxidant channel: the tail end of central tube oxidant channel is reducing-formed central tube nozzle, the medium ring coal-water slurry channel and outer ring oxidant channel are reducing-formed medium ring tube nozzle and outer ring tube spray head, the outer ring tube spray head is connected with atomizing head on which the jet orifices are uniformly distributed.

Description

technical field [0001] The invention relates to a combustion device, more specifically, the invention relates to a coal-water slurry gasification nozzle. Background technique [0002] In the coal water slurry gasification process, the gasification nozzle is the key equipment. The atomization effect of the nozzle directly affects the carbon conversion rate, the temperature field in the gasifier and the service life of the lining refractory bricks. Since coal water slurry is a high-viscosity fluid, and there are a large amount of suspended particles, it is a solid-liquid two-phase fluid, and the nozzle wear is quite serious during the atomization process. Therefore, the first requirement for the coal water slurry gasification nozzle is to ensure a good Excellent atomization quality and wear resistance. [0003] At present, there are various coal-water slurry gasification nozzles at home and abroad. For example, the nozzle patents adopted by Texaco coal-water slurry gasificat...

AI Technical Summary

Problems solved by technology

Currently the most widely used three-channel atomizing nozzle has problems such as unsatisfactory atomization performance and poor nozzle load adjustability.

[0004] In summary, the existing nozzles have the following disadvantages: the design of the total oxygen pipe and the central pipe is not very reasonable, so that the proportion of oxygen distribution between the two is out of balance, and the central oxygen only accounts for 8-9%, resulting in the shortening of the unburned area and the coal water slurry The area that is atomized into fine droplets becomes smaller, and the active component of the gas is CO+H 2 Reduced, the amount of residual carbon in the ash increased, sometimes as high as 30%, but the design value was only 8%, indicating that the nozzle atomization performance is poor; the nozzle load is poorly adjustable, generally only when the atomization effect is operated within 80-100% load It is better, the operation of the gasifier is stable, and the atomization performance becomes worse when the load is increased or decreased; generally, there is a flow meter in the design of the nozzle center tube, but there is no adjustment means, and the operation has a certain degree of blindness The nozzle pressure difference design index is quite different from the actual operation, which may sometimes cause the coal-water slurry to enter the furnace in a liquid flow state. If it touches the furnace lining refractory bricks, it will cause brick quenching and reduce the erosion and corrosion resistance of the refractory bricks. The service life of refractory bricks; the nozzle atomization angle is difficult to control, the nozzle atomization angle changes greatly with the load change, the length of the torch is difficult to control, and the nozzle atomization angle is too large may also cause the atomized airflow to directly wash the furnace lining refractory bricks and greatly reduce The service life of refractory bricks; the service life of nozzles is short, generally only two months

In addition, the current domestic applications are all foreign patented products, which are extremely expensive and controlled by others. Although the self-developed coal-water slurry gasification nozzle has been reported, it has not been put into use.

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