Downcomer having membrane type wall structure

Abstract

In a film wall-structure falling pipe, the pipe wall of the falling pipe adopts film wall structure, i.e. the pipe wall of the falling pipe is completely or partially constructed by arranging a plurality of thin pipes. The upper and lower ends of the thin pipe constructing the film wall are connected with an upper header and a lower header respectively. Circulating cooling water is communicated in the upper header, the thin pipes and the lower header. The thin pipes are smooth straight pipes or corrugated pipes, and the adopted arrangement mode is vertical arrangement, or horizontal arrangement, or serpentine circuitous arrangement. The thin pipes are sequentially connected or connected at intervals by a welding method; the thin pipes connected at intervals are connected by using flat steel. By adopting the film wall-structure falling pipe, the pipe wall can be effectively prevented from the damage of high temperature gas or melting slag. The surface area of the film wall-structure falling pipe is larger than that of the existing barrel-type falling pipe, thus enlarging the contact between a falling liquid film and the high temperature gas and playing the role of heat transfer enhancement. The film wall-structure falling pipe can be manufactured by adopting common steels, thus dramatically reducing the manufacturing cost.

Description

technical field [0001] The invention relates to a downcomer structure for coal gasification in the chemical industry, belonging to the technical field of energy utilization. Background technique [0002] The downcomer is a cooling and washing device for high temperature gas and slag in the process of coal gasification. Coal burns under anoxic conditions to produce high-temperature gas and slag as high as 1400°C, which enters the downcomer through the quenching ring, and directly contacts the descending liquid film flowing on the inner wall of the downcomer to exchange heat. Realize the cooling and humidification of high-temperature gas, and the solidification of slag. [0003] The practice of industrial operation shows that the violent flow and heat and mass transfer process in the downcomer make the downcomer liquid film evaporate and break easily, causing the inner wall of the downcomer to be directly exposed to high-temperature gas. At present, the downcomers used in co...

AI Technical Summary

Problems solved by technology

Practice shows that neither of the two methods can fundamentally effectively protect the downcomer

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