Method and structure for cleaning water vapor system of Shell gasification furnace

Abstract

The invention discloses a method for cleaning a water vapor system of a Shell gasification furnace. The method comprises the following steps of: a, feeding water to a steam pocket; b, connecting a water outlet pipe of the steam pocket with a cooling water outlet of the gasification furnace by using a water inlet temporary pipe, connecting a cooling water inlet of the gasification furnace with a cooling water drainage pipe by using a water outlet temporary pipe; and c, opening a valve of the steam pocket to ensure that water in the steam pocket flows in from a condensed water outlet of the gasification furnace and flow outs from a condensed water inlet of the gasification so that backwashing is realized. According to the method, the gasification furnace is cleaned by using a backwashing method, therefore, impurities possibly re-generated in the water vapor system after a gasification furnace body and an external pipe are welded in a contact manner can be thoroughly removed, and for Lambda pipes on the membrane walls of the gasification furnace, impurities and dead angles in water vapor branch pipes are thoroughly cleaned. The stability of the gasification working condition of the Shell gasification furnace is ensured and the service life of the membrane wall of the gasification furnace is prolonged; and no Lambda pipes on the membrane walls are blocked, thus cleaning time and cost are saved.

Description

technical field [0001] The invention relates to a method for cleaning the water vapor system of a Shell gasifier and a cleaning structure. Background technique [0002] The water vapor system of the Shell gasifier is the core part of the entire coal gasification device. When the high-pressure pulverized coal and pure oxygen undergo violent incomplete combustion in the gasification chamber to release syngas up to 1500 ° C, the boiler water in the steam drum passes through the circulating water pump Forced circulation enters the gasification chamber, quenching section, gas pipeline, back-mixing chamber and the membrane wall of evaporator 1-3, and the heat in the synthesis gas is heated by boiler water circulation to the steam drum to generate medium-pressure saturated steam Change away, so that the high-temperature gas can drop below 340°C at the outlet of the syngas cooler to ensure the safety and stability of the downstream device. These membrane walls are assembled and wel...

AI Technical Summary

Problems solved by technology

The current cleaning of the Shell gasifier is to use high-pressure flushing in the forward direction. This flushing method needs 6-8 times to meet the flushing requirements. This is not only time-consuming, water-consuming, and energy-consuming, but also uses high-pressure operation. The damage to the equipment is very serious. serious

At the same time, the existing flushing method cannot flush out the larger debris, and the water pipes forming the membrane wall will be blocked with the accumulation of time. At this time, the blocked membrane wall needs to be replaced or the The membrane wall is cut open for cleaning, which will further increase the related costs and time

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