Natural circulation type hot water boiler structure

Abstract

The invention relates to a natural circulation type hot water boiler structure comprising a hearth. The natural circulation type hot water boiler structure is characterized in that a cyclone separator is arranged at an outlet of the hearth, the outlet end of the cyclone separator is communicated with a horizontal flue, a tail vertical shaft is arranged at one side of the horizontal flue, an economizer is installed in the tail vertical shaft, an air preheater is installed at the bottom part of the tail vertical shaft, and a flue gas outlet is arranged at the lower part of the air preheater; and an economizer header is installed at the lower part of the economizer, the economizer header is connected with a boiler barrel at the upper end of the hearth by a connecting pipe, a boiler pipe is connected with a lower header of a water cooling wall by a centralized downcomer at the outside of the hearth, the lower header of the water cooling wall is connected with a water inlet of the water cooling wall, a water outlet at the upper end of the water cooling wall is connected with the boiler barrel, and a water outlet of the boiler barrel is connected with the hot water outlet header at the top part of the tail vertical shaft. According to the natural circulation type hot water boiler structure, the height of the tail vertical shaft is decreased, the height of the hearth is decreased, the metal consumption quantity of the boiler main body is reduced, the imperfect combustion loss of the boiler machinery is reduced, and the boiler efficiency is improved.

Description

technical field [0001] The invention relates to a natural circulation hot water boiler structure, in particular to a hot water boiler for medium and large capacity. Background technique [0002] Due to the continuous advancement of the national energy-saving policy, the penetration rate of central heating in the northern region is getting higher and higher, and hot water is mostly used as the heating medium, so hot water boilers are widely used. Based on the comprehensive consideration of boiler room construction and boiler operating costs, the combustion equipment of medium and large capacity hot water boilers (29MW~70MW) mostly adopts a layer-fired grate structure. As far as the furnace circulation mode is concerned, there are natural circulation and forced circulation. The water flow of natural circulation is as follows: the return water first enters the economizer, enters the drum after being heated, is led to the water wall by the centralized downcomer, rises to the dr...

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Problems solved by technology

[0006] However, in order to arrange a sufficient heating surface at the rear, the height of the shaft is usually higher, so the height of the furnace is higher, but the temperature of the flue gas at the outlet of the furnace is only about 920°C, resulting in a huge waste of metal consumption in the boiler body

Because the furnace body is high, the construction cost of the boiler room is correspondingly increased

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