Direct-spraying coal water slurry gasifying nozzle with direct cooling

Abstract

The invention relates to a direct-spraying coal water slurry gasifying nozzle with direct cooling, comprising a central tube with an expansion section, an auxiliary gasifying agent spraying tube, air inlet holes, an inner sleeve tube, an inner annular tube, an outer sleeve tube, an gasifying agent inlet, a coal water slurry inlet, an auxiliary gasifying agent inlet, a coolant inlet and a coolant outlet. The front half part of the central tube with the expansion section is provided with at least two rows of air inlet holes, and the back end is provided with the coal water slurry inlet; the center of the back half part of the central tube is provided with the auxiliary gasifying agent spraying tube; the front end of the inner sleeve tube is connected with the head of the expansion section of the central tube, and the back end is provided with the gasifying agent inlet; a gap is arranged between the front end of the inner sleeve tube and the middle of the expansion section of the centraltube, and the back end is connected with the coolant outlet; the front end of the outer sleeve tube is connected with the head of the expansion section of the central tube, and the back end is connected with the coolant inlet; the included angle between the air inlet hole and the axis of the central tube is 30-90 DEG, and the slant angle is 0-70 DEG; and the front half part of the central tube with the expansion section is made of a metal material with performances of wear resistance, corrosive resistance and high temperature resistance or a built-in high-temperature ceramic material.

Description

1. Technical field [0001] The invention relates to a direct-injection coal-water slurry gasification nozzle with direct cooling, which belongs to the field of coal chemical industry, in particular to a coal-water slurry gasification nozzle. 2. Background technology [0002] Coal gasification is the leading and key technology of modern coal chemical industry. Among many gasification methods, the jet-carrying bed (or entrained bed) technology, which uses coal water slurry as raw material and oxygen-containing gas as gasification agent, has the advantages of carbon conversion rate, simple equipment structure, convenient operation, and high gasification pressure. , It can meet the isobaric synthesis of the follow-up process, etc., which is generally favored by people. The core of this technology is the gasification nozzle of coal water slurry. [0003] U.S. Patent S.U.Pat.3705108, 3743606 and Chinese Patent CN1125163A respectively disclose a coal-water slurry gasification nozz...

AI Technical Summary

Problems solved by technology

Although measures such as wear-resistant and high-temperature resistant materials and additional cooling coils are used at the end of the nozzle, due to structural reasons, the position of the shrinking nozzle of the inner ring of the coal-water slurry cannot be cooled, and it has been in a state of high-temperature radiation. In addition, the impact and wear of the coal-water slurry, The service life of the nozzle is generally about 45 days, and the longest use record is less than half a year, resulting in extremely high production costs of the coal-water slurry gasifier

Chinese patent ZL200720306001.4 proposes a direct-cooling coal-water slurry gasification nozzle with an expansion section, which solves the cooling and wear problems of the nozzle well, but there is still room for improvement in the atomization effect

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