Combustion method and combustion device for solid fuel

Abstract

A combustion method and a combustion apparatus (100) for a solid fuel. The combustion apparatus (100) comprises a furnace chamber (10), a material-piling layer (1) formed within the furnace chamber (10), an air inlet side (101) formed at one side of the material-piling layer (1), and a combustion side (102) formed at the other side opposite the air inlet side (101). The material-piling layer (1) separates the air inlet side (101) from the combustion side (102). A heat accumulator (2) is arranged on a flow path of an airflow having a volatile (51) of the combustion side (102).

Description

technical field [0001] The invention relates to the field of solid fuel combustion, in particular to a solid fuel combustion method and a combustion device. Background technique [0002] From the perspective of fuel classification, solid fuel is the most widely used combustion material for modern humans because of its rich resources and safe use, especially coal. In addition, with the increase of demand for mineral solid fuel represented by coal, the reduction of resources, and the development of the global new energy movement, renewable biomass combustion materials, such as straw, straw, wood, sawdust, Dead branches etc. are highly valued by people. [0003] At present, the main method of using biomass combustion materials is to directly ignite and burn, which has a very low combustion efficiency and produces a large amount of black smoke, causing environmental pollution. [0004] For a long time, many people have tried to use existing coal-fired stoves to burn biomass fu...

AI Technical Summary

Problems solved by technology

[0008] 1) Low combustion efficiency

During combustion, since the precipitation temperature of volatile components is lower than the ignition point of volatile components, volatile components are first precipitated and discharged into the air in the form of black smoke, and the remaining fixed carbon is burned again, so that only the fixed carbon in it is used for combustion The heat generated not only has relatively low combustion efficiency, but also has emission pollution.

[0009] 2) can not sustain burning

[0012] The hot blast stove test method solves the problems of forward combustion and reverse combustion by combining positive and negative combustion. However, when the hot blast stove 900 is in use, it has the following defects and cannot be used continuously:

[0013] 1) Since the upper combustion chamber 92 and the lower combustion chamber 93 are separated by the upper grate 94, during the combustion process, the incompletely burned fuel in the upper combustion chamber 92 needs to fall into the lower combustion chamber 93 to continue burning. The burning speed of the incompletely burned fuel in the lower combustion chamber 93 cannot match the speed at which the material is dropped into the lower combustion chamber 93 through the upper furnace grate 94, and the incompletely burned fuel piled up in the lower combustion chamber 93 is more and more. Afterwards, the smoke outlet 98 in the lower combustion chamber 93 will be blocked, not only cannot continue to burn, but also the gas in the combustion chamber will emerge from the air inlet, which may cause a safety accident

However, due to the difference in the burning speed of different fuels, it is difficult to ensure that the burning speeds of the upper and lower combustion chambers are completely matched in the actual use process, which makes the hot blast stove unsafe when used.

[0014] 2) The fuel is burned in the upper combustion chamber 92, and the flame needs to pass through the upper grate and enter the lower combustion chamber, so that the temperature at the position of the upper grate is still high, and there is still a problem of melting ash on the upper grate, and it will burn for a period of time Finally, the molten ash on the upper grate will bond the fuel on the upper grate together, and the fuel cannot be dropped into the combustion chamber through the upper grate. The fuel can only be burned in the upper combustion chamber, and the ashes on the upper grate will eventually completely burn The upper furnace grate is stuck, which makes the hot blast stove unable to work continuously

In this way, after the hot blast stove has been working for a period of time, the gaps of the lower furnace grate 95 are covered with melted ash, which cannot effectively discharge the ash, thus causing the hot blast stove to be unable to continue to work.

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