Circulating fluidized bed hot-water boiler free of abrasion and corrosion

Abstract

The invention relates to a circulating fluidized bed hot-water boiler free of abrasion and corrosion, and relates to a circulating fluidized bed hot-water boiler. The circulating fluidized bed hot-water boiler solves the problem that pipe burst is generated because the heated surface of a boiler is reduced in thickness by suffering from the abrasion and the corrosion since fuel coal generates a high-temperature flue gas when being combusted in a furnace body, the flue gas contains sulfides, high-temperature high-pressure fuel particles and dust and the flue gas generate great impact accompanied by invasion, namely high-temperature oxidation, fly ash erosion and low-temperature dew-point corrosion, on the heated surface of a boiler in a boiler body in the using process of the traditional high-capacity circulating fluidized bed hot-water boiler. The circulating fluidized bed hot-water boiler free of abrasion and corrosion comprises a hearth, a water-cooled wall, a flue, a coal economizer cladding tube, a coal economizer, an air preheater, a plurality of pins, a plurality of clasp nails, a plurality of steel grids, composite material refractory concrete and an anti-abrasion cover. The circulating fluidized bed hot-water boiler disclosed by the invention is used for industrial and agricultural heating and urban centralized heating.

Description

technical field [0001] The invention relates to a circulating fluidized bed hot water boiler, in particular to a circulating fluidized bed hot water boiler for preventing wear and corrosion. Background technique [0002] Large-capacity circulating fluidized bed hot water boilers are widely used in urban central heating. The coal used as fuel has a large amount of ash and contains sulfides. During use, the combustion of fuel coal in the furnace body will produce high-temperature flue gas, which contains sulfides. The high-temperature and high-pressure fuel particles, dust, and flue gas in the furnace body will have a huge impact on the heating surface of the boiler, accompanied by High-temperature oxidation, fly ash erosion, low-temperature dew point corrosion, etc., cause the heating surface of the boiler to be worn and corroded, and the thickness of the heating surface of the boiler is reduced until the tube bursts. The wear and corrosion of the heating surface of the boil...

AI Technical Summary

Problems solved by technology

During use, the combustion of fuel coal in the furnace body will produce high-temperature flue gas, which contains sulfides. The high-temperature and high-pressure fuel particles, dust, and flue gas in the furnace body will have a huge impact on the heating surface of the boiler, accompanied by High-temperature oxidation, fly ash erosion, low-temperature dew point corrosion, etc., cause the heating surface of the boiler to be worn and corroded, and the thickness of the heating surface of the boiler is reduced until the tube bursts. The wear and corrosion of the heating surface of the boiler seriously affect the use of the boiler, shorten The service life of the boiler is shortened, causing economic losses, and at the same time, there are potential safety hazards in the use of the boiler

Images