Biomass boiler and method for using heat energy by biomass boiler

Abstract

The invention discloses a biomass boiler which comprises a feed hopper, an isolating door, a fire grate, a preposed furnace arch, an air supply opening, a fluidized bed, a cap, a reject valve, a heated face and a smoke outlet. The invention further discloses a method for using heat energy applied to the biomass boiler. The method comprises the following steps: 1, when the boiler is started, detecting whether the air supply opening is started or not, when the air supply opening is started, raising the isolating door and executing a step 2, otherwise, closing the isolating door and executing a step 5; 2, feeding a biomass fuel into the fire grate from the feed hopper, wherein chemical energy in volatile matters of the biomass fuel is converted into heat energy; 3, feeding the biomass fuel into a combustion region of the fluidized bed, wherein the chemical energy in fixed carbon is converted into heat energy, and residual ash is discharged from the reject valve, when the boiler needs to be stopped in operation, executing a step 4; 4, stopping supplying the fuel, closing the air supply opening and executing the step 1; and 5, stopping operation of the boiler. The biomass boiler disclosed by the invention has the advantages that the fuel burnout rate and the boiler combustion efficiency are improved.

Description

technical field [0001] The invention relates to a thermal energy utilization technology, in particular to a biomass boiler and a method for utilizing thermal energy. Background technique [0002] my country is a large agricultural country with a wide range of biomass sources, and biomass fuel has CO 2 Net emission is 0, sulfide, NO x It has excellent environmental protection characteristics such as low emission of heavy metal pollutants, and ash can be returned to the field, which is called green energy and low-carbon energy. At the same time, biomass energy is a renewable energy source. In today's increasingly scarce energy sources, its utilization has great energy strategic significance and is increasingly valued by the country. Biomass boiler is a kind of biomass energy utilization equipment. The main principle is to utilize its heat energy through the combustion of biomass fuel. At this stage, many biomass-fired furnaces are transformed from previous coal-fired furnac...

AI Technical Summary

Problems solved by technology

However, because biomass boilers have just started to be implemented, the process of design, transformation and operation is still in the exploratory stage, and the characteristics of biomass fuels are not studied enough. The volatile content of biomass is high, and a large amount of volatile combustion in an instant will lead to concentrated release of heat, making Flashover phenomenon exists in the operation of some biomass boilers

In addition, if the boiler stops the air supply, the fuel continues to fall into the grate from the feed hopper and moves forward accordingly. At this time, the high-temperature flue gas heat transfer and radiation heating of the feed in the furnace will cause volatile components to escape and accumulate. In the furnace area, when it reaches a certain concentration and temperature, it will suddenly burn or even explode, seriously affecting the safe and economical operation of the boiler, and also bringing great safety hazards to production.

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