Process nozzle and system for gasifying water coal slurry and application thereof

Abstract

The invention provides a process nozzle and a system for gasifying water coal slurry. The process nozzle comprises a first oxygen channel, a water coal slurry channel, a second oxygen channel, a first cooling water jacket and a cooling water coil, wherein the first oxygen channel comprises a first oxygen channel inlet and a first oxygen channel outlet; the water coal slurry channel comprises at least one water coal slurry channel inlet and a water coal slurry channel outlet; the second oxygen channel comprises a second oxygen channel inlet and a second oxygen channel outlet; the first cooling water jacket comprises a first cooling water jacket inlet and a first cooling water jacket outlet; and the cooling water coil comprises a cooling water coil inlet and a cooling water coil outlet. The process nozzle is characterized in that: the first oxygen channel is positioned at the central position of the process nozzle; the water coal slurry channel is positioned between the first oxygen channel and the second oxygen channel and surrounds the periphery of the first oxygen channel; and the second oxygen channel surrounds the periphery of the water coal slurry channel. The process nozzle reduces the length of combustion flame more effectively, reduces the ablation of flame on a refractory brick, promotes the mixing and atomization of water coal slurry and oxygen and improves gasification efficiency.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to a process burner and system for coal-water slurry gasification and its application. Background technique [0002] Coal is an important energy source. For a long time, the use of coal has been accompanied by serious environmental pollution. In recent years, people have paid more and more attention to clean coal technology aimed at reducing pollution emissions and improving utilization efficiency; coal gasification technology, as one of the coal processing and conversion technologies, is considered to be one of the most efficient and clean clean coal technologies. Modern coal gasification technology, especially high-pressure, large-capacity entrained-bed gasification technology has been widely used in industry, and Texaco coal-water slurry pressurized gasification technology is the most typical representative. In my country, many manufacturers have introduced and used Texaco techn...

AI Technical Summary

Problems solved by technology

[0006] (1) The spraying distance of the "flame" is long, which causes severe ablation of the refractory bricks in the gasifier and shortens the service life of the gasifier;

[0007] (2) The mixing of the gasification agent and the fuel is poor, the gasification is not perfect, and the effective gas (CO+H 2 ) content of components is low, while CO 2 The content is relatively high, and the conversion rate of carbon is only 96%;

[0008] (3) The burner is severely eroded, and the service life is only 2 to 3 months

But (1) the coal slurry is a jet flow, so some coal slurry particles will still be injected into the quenching chamber without gasification and combustion, so there is still room for improvement in gasification efficiency; (2) at the same time, the burner is heated The situation of bad ablation still has limited improvement; (3) the cooling water coil is also more likely to be burned through, and even cause parking in severe cases; (4) the direct frontal impact of high-speed coal water slurry on the burner will cause the burner to burn for a long time. Abraded by erosion

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