Downdraft High Efficiency Finned Tube Biomass Boiler

Abstract

The invention discloses a downdraught type efficient finned tube biomass boiler comprising an upper cover, an upper shell cover structure, a boiler barrel, a lower shell cover structure, a lower boiler body and a chimney from top to bottom; a plurality of finned tubes are evenly distributed in the circumferential direction inside the boiler barrel; the center of the bottom of the boiler barrel is provided with a heat resistant arch; the inner cavity of the heat resistant arch serves as a hearth and is provided with a boiler door structure in a connected mode. The outer edge of the top of the heat resistant arch is upwards connected with an inner tubular ring, and a water cavity is defined by the boiler barrel, the inner ring and the heat resistant arch; the chimney penetrates through the upper cover and the upper shell cover structure in sequence from top to bottom in a sealed mode and extends into the inner ring, and the bottom end of the chimney is provided with an opening located in the bottom of the inner ring; a cavity is formed in the lower boiler body and is internally provided with an ash chamber, and the bottom of the lower boiler body is communicated with an air inlet. The heat exchange efficiency is improved through turn-back type flowing of high temperature air flow, and the temperature of exhausted smoke is decreased. Air is heated through waste heat of boiler ash when entering the boiler through the air inlet, heat needed for heating air in the secondary combustion process is reduced, secondary combustion is more stable and reliable, and the utilization rate of energy is improved.

Description

Technical field [0001] The invention relates to the technical field of biomass boilers. Background technique [0002] Currently, there are few boilers specifically designed for biomass fuels. Biomass is a renewable energy source different from coal. First, the composition of biomass fuel is different from coal. The volatile content of biomass is relatively high, reaching about 70%, while that of coal is about 10%; the sulfur content of biomass fuel is relatively low, only one-tenth to one-twentieth that of coal. Secondly, the combustion characteristics of biomass are also different: 1. During the combustion of biomass fuel, if the primary combustion temperature is too high, the slag phenomenon will be more serious than that of coal, and even molten glass will form on the grate; 2. The density of the ash produced by the combustion of biomass fuel is very small, and the ash floating on the water surface will accumulate into agglomerates; finally, if the volatile matter of the bi...

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Problems solved by technology

Secondly, the combustion characteristics of biomass are also different: 1. During the combustion process of biomass fuel, if the primary combustion temperature is too high, the slag phenomenon will be more serious than coal, and even molten glass will be formed on the grate; 2. The density of ash produced by biomass fuel combustion is very small, and the floating ash will accumulate on the water surface; finally, if the volatile content of biomass is not completely burned, the tar produced will adhere to the heating surface and flue, which not only reduces the The heat transfer capacity is impaired, and even the channel will be blocked. If the floating ash is attached, the consequences will be worse

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