A descending high-temperature gasification product quenching device

Abstract

The invention provides a downlink high-temperature gasified product chilling device which comprises a gasifying section, a chilling section and a cooler section. The gasifying section is used for generating a gasified product. The chilling section is used for chilling the gasified product generated by the gasifying section to enable the gasified product to be cured fast and lose cohesiveness. The cooler section is used for further cooling the product chilled by the chilling section and recovering waste heat. High-temperature synthesis gas with molten ash is chilled by low-temperature chilling gas nearby an outlet of a gasifying furnace, the temperature falls abruptly below an ash fusion point, the surface of slag is cured instantly, the slag is gathered to a center area to descend under carrying of chilling gas flow, the ash is prevented from falling into a synthesis gas cooler in a slag form to the maximum, and the situation that ash particles make contact with the water cooling wall face of the synthesis gas cooler and cause contamination is effectively prevented. Water vapor is adopted as the chilling gas, the shift reaction can be promoted, the volume fraction of H2 in the synthesis gas is greatly increased, and loads and shift cost of a follow-up shift system are greatly reduced. The system is easy to operate and has a large-scale application and popularization prospect.

Description

Technical field [0001] The invention relates to a downward type high-temperature gasification product chilling device, which belongs to the technical field of clean energy utilization. Background technique [0002] The product of the high temperature and high pressure entrained bed gasification process has a large amount of high-level sensible heat for recycling, which can increase the system efficiency by 4-5 percentage points. However, the ash particles under high-temperature gasification conditions are in a molten liquid state, which will cause contamination and slagging on the heating surface of the heat exchange system, and even block the slag after heat transfer deteriorates. Especially for the downward entrained bed gasifier, the synthesis gas entrains a large amount of molten ash and flows down. If the temperature of the stream is not controlled directly into the heat exchanger, it will cause a huge risk to the heating surface of the heat exchanger. [0003] The existing d...

AI Technical Summary

Problems solved by technology

Since gasification technology is the core shared technology of coal chemical technology, the produced CO and H 2 As raw material gas for downstream chemical production, H 2 The ratio requirement is higher, usually requires H 2 The / CO volume ratio reaches more than 2. Therefore, compared with the coal-water slurry gasification technology in the existing dry coal gasification process, the H on the product gas 2 There is a certain difference in the / CO volume ratio, and more investment and operating costs for subsequent conversion systems are required under the same equivalent effective gas state

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