Special system for interface of medium temperature flue gas pipeline and heating surface in middle storage type bituminous coal boiler

Abstract

The invention provides a special system for an interface of a medium temperature flue gas pipeline and a heating surface in a middle storage type bituminous coal boiler. The special system comprises a wall enclosure superheater connected with the pipeline and is characterized in that the center position of the wall enclosure superheater is provided with a rhombic opening. The special system solves key technology of medium temperature flue gas inerting and drying system construction, designs the shape of the interface of a vapour-water heating surface and the medium temperature flue gas pipeline, solves the difficult problems of thermal expansion, sealing and stress of the vapour-water heating surface and the medium temperature flue gas pipeline in different directions, and achieves design of the medium temperature flue gas pipeline.

Description

technical field [0001] The invention relates to the field of pipeline design for re-opening the steam-water heating surface of a power plant and realizing extraction of boiler flue gas, and is a design technology for the interface between the high-temperature flue gas pipeline and the steam-water heating surface. Background technique [0002] In recent years, with the development of the national economy, the demand for electricity has grown rapidly, and the demand for coal has soared; coal prices have risen sharply year by year; coal resources in Northeast China have become increasingly exhausted; moreover, this contradiction will continue for a long time in the future; The power generation company is looking for a coal type that is low in price and can ensure a large amount of long-term stable supply; the lignite reserve in the eastern Mongolia area is abundant, the coal source is sufficient, and the transportation distance is short, and the price is relatively low; the boi...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems such as explosion-proof, drying output, severe coking, and unsatisfactory output of the unit in the pulverizing system in the medium-storage bituminous coal boiler with a large proportion of mixed-fired lignite, the medium-temperature flue gas inerting and drying technology was developed. In order to implement and promote this This technology must solve the key technologies in construction, especially the interface between the steam-water heating surface and the medium-temperature flue gas pipeline. It involves sealing, welding, expansion, support and other issues. The technology is complex and determines whether the technology can be successfully applied and promoted.

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