Stationary bed boiler preheated vertically and burnt sectionally at low temperature

Abstract

The invention relates to a stationary bed boiler preheated vertically and burnt sectionally at a low temperature. A vertically-preheating and sectional low-temperature burning method is utilized. Coal is preheated to approach a burning temperature by a vertical preheating plate before falling into a fire grate and is subjected to destructive distillation, main burning, burning out and cooling after falling on the fire grate, and ash obtained after the coal is burnt out falls into a slag room and discharged by a slag discharging screw. Independent adjustable air blowers are adopted for air supplying in air chambers, so that every area in a coal layer can obtain different air sources optimal in air pressure and air capacity. In every stages from vertical preheating and falling into the fire grate of the coal, the highest temperature of the coal layer is controlled to be not over 1100 DEG C, ash softening is avoided during the whole process of burning, good ventilate performance of the coal layer is guaranteed throughout, and burning out of fuel is ensured. Burning heat efficiency of the stationary bed boiler preheated vertically and burnt sectionally at the low temperature is greatly improved and is comparable with that of a fluidized bed boiler, and the advantages like low power consumption, less abrasion and simplicity in operation of the stationary bed boiler are reserved.

Description

Technical field: [0001] The present invention is applied to fixed bed boilers, using vertical preheating and segmented low-temperature combustion methods to completely change the defects of traditional fixed bed boilers and improve the combustion thermal efficiency and comprehensive performance of fixed bed boilers. This combustion method is mainly used in coal-fired boilers, and can also be used in boilers with different fuels such as biomass boilers and garbage boilers. Background technique: [0002] Fixed bed boilers have a long history of use, and the technology is very mature, especially chain boilers are widely used due to their simple structure, convenient operation, low failure rate, and low power consumption. However, traditional fixed-bed boilers have narrow adaptability to coal types. For example, chain boilers are only suitable for burning coal with high calorific value (too little volatile matter is not easy to burn), reciprocating grate boilers are only suitabl...

AI Technical Summary

Problems solved by technology

However, traditional fixed-bed boilers have narrow adaptability to coal types. For example, chain boilers are only suitable for burning coal with high calorific value (too little volatile matter is not easy to burn), reciprocating grate boilers are only suitable for coal with low calorific value, and the ash content higher

At the same time, traditional fixed-bed boilers have many defects such as low combustion thermal efficiency, easy coking, residual carbon in slag is not easy to burn out, and low energy utilization rate.

It is very difficult to further improve the combustion efficiency of traditional fixed bed boilers

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