Double-sided water-wall cylinder-type synthetic gas cooler

Abstract

The invention discloses a double-sided water-wall cylinder-type synthetic gas cooler. According to the invention, a chilling gas / vapor inlet is arranged on the upper part of a water-wall. A high-temperature high-pressure gasification product is chilled by the chilling gas / vapor, cooled by the water-wall, and is discharged. Because the chilling gas / vapor inlet is arranged on the upper part of the water-wall in an inner cylinder of a cooler, the high-temperature high-pressure gasification product delivered into the cooler can be chilled by the low-temperature chilling gas / vapor. The temperatureof the gasification product is rapidly reduced to a value below 900 DEG C, such that slag particles in a molten state are rapidly cured, and accumulates in a central flow channel under an accumulation effect of gas flows. Therefore, a probability for the slag to deposit on the water-wall is reduced to a maximal extent.

Description

technical field [0001] The invention relates to a high-temperature, high-pressure product sensible heat recovery technology applied to the gasification of carbon-containing solid fuels such as coal, in particular to a double-sided water-cooled wall cylindrical syngas cooler. Background technique [0002] The Integrated Gasification Combined Cycle (IGCC) that is currently emerging is considered to be one of the cleanest and most efficient coal-based power generation technologies in the world. In order to obtain a higher carbon conversion rate and cold gas efficiency, the IGCC gasifier usually operates under high temperature and high pressure conditions, so the gasification product at the outlet of the gas furnace has a relatively high temperature (1200-1600°C). Due to the current technical conditions, the wet chilling technology is usually used, and a large amount of high-level sensible heat contained in the gasification product is taken away by the cooling medium and lost. ...

AI Technical Summary

Problems solved by technology

However, there is no ash and slag removal technology in the syngas cooler of the Shell gasifier. The inner wall of the cooler and the guide pipe are prone to ash deposits that affect heat transfer, and even slag blockage in severe cases. Control the water vapor content in the gas after powder gasification

The gasification furnace of GE Company adopts the form of fully radiant waste boiler to recover the sensible heat of gasification products, and the water-cooled wall surface of the inner cylinder of the radiant waste boiler is directly impacted by high-temperature syngas and molten ash, which is very difficult for the water-cooled wall of the radiant waste boiler. Phenomena such as slagging and slag blockage are prone to occur, and when the ash and slag entrainment of the synthesis gas is serious, it will also have a greater impact on the subsequent convective waste boiler

Patent CN200720011769 discloses a single-sided water-cooled wall radiant waste heat boiler. Since only one side of the water-cooled wall in the radiant waste boiler plays the role of absorbing heat and cooling down, and limited by the overall size of the radiant waste boiler, its internal space has not been rationally utilized.

Patent 200910309656 discloses a waste heat boiler with double-sided water-cooled walls. It adopts an octahedral water-cooled wall design, and there are multiple screen-type water-cooled walls inside the inner cylinder water-cooled wall. The structure is complex, and the flow field has certain differences. Uniformity, and directly accepting the flow of high-temperature molten ash particles, it is easy to form ash accumulation and slagging phenomenon on the water cooling wall. With the increase of ash accumulation, the heat transfer boundary conditions will deteriorate, so forming a vicious cycle may cause slag blocking and other bad conditions Condition

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