Hot water boiler with large-capacity water tubes

Abstract

The invention relates to a hot water boiler with large-capacity water tubes. A hearth water-cooling wall and a heat-insulating furnace wall are arranged on a body support, a sealing device is arranged at the joint of the body support and the heat-insulating furnace wall, a burning device and a coal-feeding hopper are mounted at the lower part of the hearth water-cooling wall, a platform staircase and a descending tube are arranged outside the hearth water-cooling wall and the heat-insulating furnace wall, an upper drum is mounted at the top of the hearth water-cooling wall by a steel frame, the rear part of the heat-insulating furnace wall is connected with a flue, the flue and a coal saver are connected with an air preheater, a lower drum support is arranged in a furnace chamber and provided with two lower drums, a group of convection tube membrane walls are arranged between the lower drums and the upper drum, convection tube bundles are arranged among the convection tube membrane walls, the inner wall surface of the heat-insulating furnace wall is the hearth water-cooling wall, a burn-out room is formed by the rear part of the hearth water-cooling wall at two lateral walls and the outermost convection tube membrane wall, all the convection tube bundles are classified into two convection heat-transferring areas by the convection tube membrane walls, and dust-falling devices are arranged at the lower parts of the burn-out rooms and the convection tube bundles. The hot water boiler with full water tubes has long service life and high heat-transferring efficiency.

Description

technical field [0001] The invention relates to a hot water boiler, in particular to a three-drum vertical chain furnace type large-capacity water tube hot water boiler. Background technique [0002] SZL type boiler (that is, double-drum vertical chain boiler) is a common boiler equipment in industrial boilers. It is developed from the former Soviet KE type boiler; it has compact structure, convenient installation and maintenance, and wide fuel adaptability. , high boiler thermal efficiency, simple load adjustment and other characteristics, it has been widely used in the boiler industry. SZL water tube hot water boiler is a kind of SZL boiler, its structure includes combustion equipment, furnace (water wall), upper drum, lower drum, convection tube bundle and rear heating surface economizer, air preheater, etc. Composition, the boiler body is supported on the combustion equipment frame by the water-cooled walls on both sides of the furnace and the lower drum; the flow of th...

AI Technical Summary

Problems solved by technology

The disadvantages of this type of boiler in terms of structure are: the drum is arranged longitudinally, the upper drum runs through the entire boiler body, all the heating surfaces of the boiler body, including the furnace water wall and convective tube bundles, are connected to the upper drum, and the length and width of the boiler are limited. In addition, when the heat supply of the boiler needs to be increased to a certain extent (≥46MW), it is difficult to increase the heating surface of the boiler body. In addition, the boiler body is supported on the combustion equipment frame by the water-cooled walls on both sides of the furnace and the lower drum. In addition, this also limits the length, width and height of the boiler, making it difficult to develop to a large capacity

[0003] In order to increase the heat supply of the boiler, there is a SZL shell-type water-fire tube hot water boiler. In this type of boiler, a large number of threaded smoke tubes (ie fire tubes) are arranged in the lower drum to increase the heating surface of the boiler. It has brought some shortcomings of fire tube boilers, such as scaling of the fire tube and its tube sheet on the working medium side, ash accumulation and ash blocking on the flue gas side, low temperature corrosion at the flue gas outlet, etc. are difficult to solve

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